nfs4proc.c 237 KB

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  1. /*
  2. * fs/nfs/nfs4proc.c
  3. *
  4. * Client-side procedure declarations for NFSv4.
  5. *
  6. * Copyright (c) 2002 The Regents of the University of Michigan.
  7. * All rights reserved.
  8. *
  9. * Kendrick Smith <kmsmith@umich.edu>
  10. * Andy Adamson <andros@umich.edu>
  11. *
  12. * Redistribution and use in source and binary forms, with or without
  13. * modification, are permitted provided that the following conditions
  14. * are met:
  15. *
  16. * 1. Redistributions of source code must retain the above copyright
  17. * notice, this list of conditions and the following disclaimer.
  18. * 2. Redistributions in binary form must reproduce the above copyright
  19. * notice, this list of conditions and the following disclaimer in the
  20. * documentation and/or other materials provided with the distribution.
  21. * 3. Neither the name of the University nor the names of its
  22. * contributors may be used to endorse or promote products derived
  23. * from this software without specific prior written permission.
  24. *
  25. * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26. * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27. * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28. * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29. * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30. * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31. * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32. * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33. * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34. * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35. * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36. */
  37. #include <linux/mm.h>
  38. #include <linux/delay.h>
  39. #include <linux/errno.h>
  40. #include <linux/file.h>
  41. #include <linux/string.h>
  42. #include <linux/ratelimit.h>
  43. #include <linux/printk.h>
  44. #include <linux/slab.h>
  45. #include <linux/sunrpc/clnt.h>
  46. #include <linux/nfs.h>
  47. #include <linux/nfs4.h>
  48. #include <linux/nfs_fs.h>
  49. #include <linux/nfs_page.h>
  50. #include <linux/nfs_mount.h>
  51. #include <linux/namei.h>
  52. #include <linux/mount.h>
  53. #include <linux/module.h>
  54. #include <linux/xattr.h>
  55. #include <linux/utsname.h>
  56. #include <linux/freezer.h>
  57. #include "nfs4_fs.h"
  58. #include "delegation.h"
  59. #include "internal.h"
  60. #include "iostat.h"
  61. #include "callback.h"
  62. #include "pnfs.h"
  63. #include "netns.h"
  64. #include "nfs4idmap.h"
  65. #include "nfs4session.h"
  66. #include "fscache.h"
  67. #include "nfs4trace.h"
  68. #define NFSDBG_FACILITY NFSDBG_PROC
  69. #define NFS4_POLL_RETRY_MIN (HZ/10)
  70. #define NFS4_POLL_RETRY_MAX (15*HZ)
  71. struct nfs4_opendata;
  72. static int _nfs4_proc_open(struct nfs4_opendata *data);
  73. static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  74. static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  75. static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *, long *);
  76. static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
  77. static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *, struct nfs4_label *label);
  78. static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr, struct nfs4_label *label);
  79. static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  80. struct nfs_fattr *fattr, struct iattr *sattr,
  81. struct nfs4_state *state, struct nfs4_label *ilabel,
  82. struct nfs4_label *olabel);
  83. #ifdef CONFIG_NFS_V4_1
  84. static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *,
  85. struct rpc_cred *);
  86. static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *,
  87. struct rpc_cred *);
  88. #endif
  89. #ifdef CONFIG_NFS_V4_SECURITY_LABEL
  90. static inline struct nfs4_label *
  91. nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
  92. struct iattr *sattr, struct nfs4_label *label)
  93. {
  94. int err;
  95. if (label == NULL)
  96. return NULL;
  97. if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0)
  98. return NULL;
  99. err = security_dentry_init_security(dentry, sattr->ia_mode,
  100. &dentry->d_name, (void **)&label->label, &label->len);
  101. if (err == 0)
  102. return label;
  103. return NULL;
  104. }
  105. static inline void
  106. nfs4_label_release_security(struct nfs4_label *label)
  107. {
  108. if (label)
  109. security_release_secctx(label->label, label->len);
  110. }
  111. static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
  112. {
  113. if (label)
  114. return server->attr_bitmask;
  115. return server->attr_bitmask_nl;
  116. }
  117. #else
  118. static inline struct nfs4_label *
  119. nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
  120. struct iattr *sattr, struct nfs4_label *l)
  121. { return NULL; }
  122. static inline void
  123. nfs4_label_release_security(struct nfs4_label *label)
  124. { return; }
  125. static inline u32 *
  126. nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
  127. { return server->attr_bitmask; }
  128. #endif
  129. /* Prevent leaks of NFSv4 errors into userland */
  130. static int nfs4_map_errors(int err)
  131. {
  132. if (err >= -1000)
  133. return err;
  134. switch (err) {
  135. case -NFS4ERR_RESOURCE:
  136. case -NFS4ERR_LAYOUTTRYLATER:
  137. case -NFS4ERR_RECALLCONFLICT:
  138. return -EREMOTEIO;
  139. case -NFS4ERR_WRONGSEC:
  140. case -NFS4ERR_WRONG_CRED:
  141. return -EPERM;
  142. case -NFS4ERR_BADOWNER:
  143. case -NFS4ERR_BADNAME:
  144. return -EINVAL;
  145. case -NFS4ERR_SHARE_DENIED:
  146. return -EACCES;
  147. case -NFS4ERR_MINOR_VERS_MISMATCH:
  148. return -EPROTONOSUPPORT;
  149. case -NFS4ERR_FILE_OPEN:
  150. return -EBUSY;
  151. default:
  152. dprintk("%s could not handle NFSv4 error %d\n",
  153. __func__, -err);
  154. break;
  155. }
  156. return -EIO;
  157. }
  158. /*
  159. * This is our standard bitmap for GETATTR requests.
  160. */
  161. const u32 nfs4_fattr_bitmap[3] = {
  162. FATTR4_WORD0_TYPE
  163. | FATTR4_WORD0_CHANGE
  164. | FATTR4_WORD0_SIZE
  165. | FATTR4_WORD0_FSID
  166. | FATTR4_WORD0_FILEID,
  167. FATTR4_WORD1_MODE
  168. | FATTR4_WORD1_NUMLINKS
  169. | FATTR4_WORD1_OWNER
  170. | FATTR4_WORD1_OWNER_GROUP
  171. | FATTR4_WORD1_RAWDEV
  172. | FATTR4_WORD1_SPACE_USED
  173. | FATTR4_WORD1_TIME_ACCESS
  174. | FATTR4_WORD1_TIME_METADATA
  175. | FATTR4_WORD1_TIME_MODIFY
  176. | FATTR4_WORD1_MOUNTED_ON_FILEID,
  177. #ifdef CONFIG_NFS_V4_SECURITY_LABEL
  178. FATTR4_WORD2_SECURITY_LABEL
  179. #endif
  180. };
  181. static const u32 nfs4_pnfs_open_bitmap[3] = {
  182. FATTR4_WORD0_TYPE
  183. | FATTR4_WORD0_CHANGE
  184. | FATTR4_WORD0_SIZE
  185. | FATTR4_WORD0_FSID
  186. | FATTR4_WORD0_FILEID,
  187. FATTR4_WORD1_MODE
  188. | FATTR4_WORD1_NUMLINKS
  189. | FATTR4_WORD1_OWNER
  190. | FATTR4_WORD1_OWNER_GROUP
  191. | FATTR4_WORD1_RAWDEV
  192. | FATTR4_WORD1_SPACE_USED
  193. | FATTR4_WORD1_TIME_ACCESS
  194. | FATTR4_WORD1_TIME_METADATA
  195. | FATTR4_WORD1_TIME_MODIFY,
  196. FATTR4_WORD2_MDSTHRESHOLD
  197. };
  198. static const u32 nfs4_open_noattr_bitmap[3] = {
  199. FATTR4_WORD0_TYPE
  200. | FATTR4_WORD0_CHANGE
  201. | FATTR4_WORD0_FILEID,
  202. };
  203. const u32 nfs4_statfs_bitmap[3] = {
  204. FATTR4_WORD0_FILES_AVAIL
  205. | FATTR4_WORD0_FILES_FREE
  206. | FATTR4_WORD0_FILES_TOTAL,
  207. FATTR4_WORD1_SPACE_AVAIL
  208. | FATTR4_WORD1_SPACE_FREE
  209. | FATTR4_WORD1_SPACE_TOTAL
  210. };
  211. const u32 nfs4_pathconf_bitmap[3] = {
  212. FATTR4_WORD0_MAXLINK
  213. | FATTR4_WORD0_MAXNAME,
  214. 0
  215. };
  216. const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
  217. | FATTR4_WORD0_MAXREAD
  218. | FATTR4_WORD0_MAXWRITE
  219. | FATTR4_WORD0_LEASE_TIME,
  220. FATTR4_WORD1_TIME_DELTA
  221. | FATTR4_WORD1_FS_LAYOUT_TYPES,
  222. FATTR4_WORD2_LAYOUT_BLKSIZE
  223. };
  224. const u32 nfs4_fs_locations_bitmap[3] = {
  225. FATTR4_WORD0_TYPE
  226. | FATTR4_WORD0_CHANGE
  227. | FATTR4_WORD0_SIZE
  228. | FATTR4_WORD0_FSID
  229. | FATTR4_WORD0_FILEID
  230. | FATTR4_WORD0_FS_LOCATIONS,
  231. FATTR4_WORD1_MODE
  232. | FATTR4_WORD1_NUMLINKS
  233. | FATTR4_WORD1_OWNER
  234. | FATTR4_WORD1_OWNER_GROUP
  235. | FATTR4_WORD1_RAWDEV
  236. | FATTR4_WORD1_SPACE_USED
  237. | FATTR4_WORD1_TIME_ACCESS
  238. | FATTR4_WORD1_TIME_METADATA
  239. | FATTR4_WORD1_TIME_MODIFY
  240. | FATTR4_WORD1_MOUNTED_ON_FILEID,
  241. };
  242. static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
  243. struct nfs4_readdir_arg *readdir)
  244. {
  245. __be32 *start, *p;
  246. if (cookie > 2) {
  247. readdir->cookie = cookie;
  248. memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
  249. return;
  250. }
  251. readdir->cookie = 0;
  252. memset(&readdir->verifier, 0, sizeof(readdir->verifier));
  253. if (cookie == 2)
  254. return;
  255. /*
  256. * NFSv4 servers do not return entries for '.' and '..'
  257. * Therefore, we fake these entries here. We let '.'
  258. * have cookie 0 and '..' have cookie 1. Note that
  259. * when talking to the server, we always send cookie 0
  260. * instead of 1 or 2.
  261. */
  262. start = p = kmap_atomic(*readdir->pages);
  263. if (cookie == 0) {
  264. *p++ = xdr_one; /* next */
  265. *p++ = xdr_zero; /* cookie, first word */
  266. *p++ = xdr_one; /* cookie, second word */
  267. *p++ = xdr_one; /* entry len */
  268. memcpy(p, ".\0\0\0", 4); /* entry */
  269. p++;
  270. *p++ = xdr_one; /* bitmap length */
  271. *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
  272. *p++ = htonl(8); /* attribute buffer length */
  273. p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry)));
  274. }
  275. *p++ = xdr_one; /* next */
  276. *p++ = xdr_zero; /* cookie, first word */
  277. *p++ = xdr_two; /* cookie, second word */
  278. *p++ = xdr_two; /* entry len */
  279. memcpy(p, "..\0\0", 4); /* entry */
  280. p++;
  281. *p++ = xdr_one; /* bitmap length */
  282. *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
  283. *p++ = htonl(8); /* attribute buffer length */
  284. p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry->d_parent)));
  285. readdir->pgbase = (char *)p - (char *)start;
  286. readdir->count -= readdir->pgbase;
  287. kunmap_atomic(start);
  288. }
  289. static long nfs4_update_delay(long *timeout)
  290. {
  291. long ret;
  292. if (!timeout)
  293. return NFS4_POLL_RETRY_MAX;
  294. if (*timeout <= 0)
  295. *timeout = NFS4_POLL_RETRY_MIN;
  296. if (*timeout > NFS4_POLL_RETRY_MAX)
  297. *timeout = NFS4_POLL_RETRY_MAX;
  298. ret = *timeout;
  299. *timeout <<= 1;
  300. return ret;
  301. }
  302. static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
  303. {
  304. int res = 0;
  305. might_sleep();
  306. freezable_schedule_timeout_killable_unsafe(
  307. nfs4_update_delay(timeout));
  308. if (fatal_signal_pending(current))
  309. res = -ERESTARTSYS;
  310. return res;
  311. }
  312. /* This is the error handling routine for processes that are allowed
  313. * to sleep.
  314. */
  315. int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
  316. {
  317. struct nfs_client *clp = server->nfs_client;
  318. struct nfs4_state *state = exception->state;
  319. struct inode *inode = exception->inode;
  320. int ret = errorcode;
  321. exception->retry = 0;
  322. switch(errorcode) {
  323. case 0:
  324. return 0;
  325. case -NFS4ERR_OPENMODE:
  326. case -NFS4ERR_DELEG_REVOKED:
  327. case -NFS4ERR_ADMIN_REVOKED:
  328. case -NFS4ERR_BAD_STATEID:
  329. if (inode && nfs4_have_delegation(inode, FMODE_READ)) {
  330. nfs4_inode_return_delegation(inode);
  331. exception->retry = 1;
  332. return 0;
  333. }
  334. if (state == NULL)
  335. break;
  336. ret = nfs4_schedule_stateid_recovery(server, state);
  337. if (ret < 0)
  338. break;
  339. goto wait_on_recovery;
  340. case -NFS4ERR_EXPIRED:
  341. if (state != NULL) {
  342. ret = nfs4_schedule_stateid_recovery(server, state);
  343. if (ret < 0)
  344. break;
  345. }
  346. case -NFS4ERR_STALE_STATEID:
  347. case -NFS4ERR_STALE_CLIENTID:
  348. nfs4_schedule_lease_recovery(clp);
  349. goto wait_on_recovery;
  350. case -NFS4ERR_MOVED:
  351. ret = nfs4_schedule_migration_recovery(server);
  352. if (ret < 0)
  353. break;
  354. goto wait_on_recovery;
  355. case -NFS4ERR_LEASE_MOVED:
  356. nfs4_schedule_lease_moved_recovery(clp);
  357. goto wait_on_recovery;
  358. #if defined(CONFIG_NFS_V4_1)
  359. case -NFS4ERR_BADSESSION:
  360. case -NFS4ERR_BADSLOT:
  361. case -NFS4ERR_BAD_HIGH_SLOT:
  362. case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
  363. case -NFS4ERR_DEADSESSION:
  364. case -NFS4ERR_SEQ_FALSE_RETRY:
  365. case -NFS4ERR_SEQ_MISORDERED:
  366. dprintk("%s ERROR: %d Reset session\n", __func__,
  367. errorcode);
  368. nfs4_schedule_session_recovery(clp->cl_session, errorcode);
  369. goto wait_on_recovery;
  370. #endif /* defined(CONFIG_NFS_V4_1) */
  371. case -NFS4ERR_FILE_OPEN:
  372. if (exception->timeout > HZ) {
  373. /* We have retried a decent amount, time to
  374. * fail
  375. */
  376. ret = -EBUSY;
  377. break;
  378. }
  379. case -NFS4ERR_GRACE:
  380. case -NFS4ERR_DELAY:
  381. ret = nfs4_delay(server->client, &exception->timeout);
  382. if (ret != 0)
  383. break;
  384. case -NFS4ERR_RETRY_UNCACHED_REP:
  385. case -NFS4ERR_OLD_STATEID:
  386. exception->retry = 1;
  387. break;
  388. case -NFS4ERR_BADOWNER:
  389. /* The following works around a Linux server bug! */
  390. case -NFS4ERR_BADNAME:
  391. if (server->caps & NFS_CAP_UIDGID_NOMAP) {
  392. server->caps &= ~NFS_CAP_UIDGID_NOMAP;
  393. exception->retry = 1;
  394. printk(KERN_WARNING "NFS: v4 server %s "
  395. "does not accept raw "
  396. "uid/gids. "
  397. "Reenabling the idmapper.\n",
  398. server->nfs_client->cl_hostname);
  399. }
  400. }
  401. /* We failed to handle the error */
  402. return nfs4_map_errors(ret);
  403. wait_on_recovery:
  404. ret = nfs4_wait_clnt_recover(clp);
  405. if (test_bit(NFS_MIG_FAILED, &server->mig_status))
  406. return -EIO;
  407. if (ret == 0)
  408. exception->retry = 1;
  409. return ret;
  410. }
  411. /*
  412. * Return 'true' if 'clp' is using an rpc_client that is integrity protected
  413. * or 'false' otherwise.
  414. */
  415. static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
  416. {
  417. rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
  418. if (flavor == RPC_AUTH_GSS_KRB5I ||
  419. flavor == RPC_AUTH_GSS_KRB5P)
  420. return true;
  421. return false;
  422. }
  423. static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
  424. {
  425. spin_lock(&clp->cl_lock);
  426. if (time_before(clp->cl_last_renewal,timestamp))
  427. clp->cl_last_renewal = timestamp;
  428. spin_unlock(&clp->cl_lock);
  429. }
  430. static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
  431. {
  432. struct nfs_client *clp = server->nfs_client;
  433. if (!nfs4_has_session(clp))
  434. do_renew_lease(clp, timestamp);
  435. }
  436. struct nfs4_call_sync_data {
  437. const struct nfs_server *seq_server;
  438. struct nfs4_sequence_args *seq_args;
  439. struct nfs4_sequence_res *seq_res;
  440. };
  441. void nfs4_init_sequence(struct nfs4_sequence_args *args,
  442. struct nfs4_sequence_res *res, int cache_reply)
  443. {
  444. args->sa_slot = NULL;
  445. args->sa_cache_this = cache_reply;
  446. args->sa_privileged = 0;
  447. res->sr_slot = NULL;
  448. }
  449. static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
  450. {
  451. args->sa_privileged = 1;
  452. }
  453. int nfs40_setup_sequence(struct nfs4_slot_table *tbl,
  454. struct nfs4_sequence_args *args,
  455. struct nfs4_sequence_res *res,
  456. struct rpc_task *task)
  457. {
  458. struct nfs4_slot *slot;
  459. /* slot already allocated? */
  460. if (res->sr_slot != NULL)
  461. goto out_start;
  462. spin_lock(&tbl->slot_tbl_lock);
  463. if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
  464. goto out_sleep;
  465. slot = nfs4_alloc_slot(tbl);
  466. if (IS_ERR(slot)) {
  467. if (slot == ERR_PTR(-ENOMEM))
  468. task->tk_timeout = HZ >> 2;
  469. goto out_sleep;
  470. }
  471. spin_unlock(&tbl->slot_tbl_lock);
  472. args->sa_slot = slot;
  473. res->sr_slot = slot;
  474. out_start:
  475. rpc_call_start(task);
  476. return 0;
  477. out_sleep:
  478. if (args->sa_privileged)
  479. rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
  480. NULL, RPC_PRIORITY_PRIVILEGED);
  481. else
  482. rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
  483. spin_unlock(&tbl->slot_tbl_lock);
  484. return -EAGAIN;
  485. }
  486. EXPORT_SYMBOL_GPL(nfs40_setup_sequence);
  487. static int nfs40_sequence_done(struct rpc_task *task,
  488. struct nfs4_sequence_res *res)
  489. {
  490. struct nfs4_slot *slot = res->sr_slot;
  491. struct nfs4_slot_table *tbl;
  492. if (slot == NULL)
  493. goto out;
  494. tbl = slot->table;
  495. spin_lock(&tbl->slot_tbl_lock);
  496. if (!nfs41_wake_and_assign_slot(tbl, slot))
  497. nfs4_free_slot(tbl, slot);
  498. spin_unlock(&tbl->slot_tbl_lock);
  499. res->sr_slot = NULL;
  500. out:
  501. return 1;
  502. }
  503. #if defined(CONFIG_NFS_V4_1)
  504. static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
  505. {
  506. struct nfs4_session *session;
  507. struct nfs4_slot_table *tbl;
  508. struct nfs4_slot *slot = res->sr_slot;
  509. bool send_new_highest_used_slotid = false;
  510. tbl = slot->table;
  511. session = tbl->session;
  512. spin_lock(&tbl->slot_tbl_lock);
  513. /* Be nice to the server: try to ensure that the last transmitted
  514. * value for highest_user_slotid <= target_highest_slotid
  515. */
  516. if (tbl->highest_used_slotid > tbl->target_highest_slotid)
  517. send_new_highest_used_slotid = true;
  518. if (nfs41_wake_and_assign_slot(tbl, slot)) {
  519. send_new_highest_used_slotid = false;
  520. goto out_unlock;
  521. }
  522. nfs4_free_slot(tbl, slot);
  523. if (tbl->highest_used_slotid != NFS4_NO_SLOT)
  524. send_new_highest_used_slotid = false;
  525. out_unlock:
  526. spin_unlock(&tbl->slot_tbl_lock);
  527. res->sr_slot = NULL;
  528. if (send_new_highest_used_slotid)
  529. nfs41_notify_server(session->clp);
  530. }
  531. int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
  532. {
  533. struct nfs4_session *session;
  534. struct nfs4_slot *slot = res->sr_slot;
  535. struct nfs_client *clp;
  536. bool interrupted = false;
  537. int ret = 1;
  538. if (slot == NULL)
  539. goto out_noaction;
  540. /* don't increment the sequence number if the task wasn't sent */
  541. if (!RPC_WAS_SENT(task))
  542. goto out;
  543. session = slot->table->session;
  544. if (slot->interrupted) {
  545. slot->interrupted = 0;
  546. interrupted = true;
  547. }
  548. trace_nfs4_sequence_done(session, res);
  549. /* Check the SEQUENCE operation status */
  550. switch (res->sr_status) {
  551. case 0:
  552. /* Update the slot's sequence and clientid lease timer */
  553. ++slot->seq_nr;
  554. clp = session->clp;
  555. do_renew_lease(clp, res->sr_timestamp);
  556. /* Check sequence flags */
  557. nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
  558. nfs41_update_target_slotid(slot->table, slot, res);
  559. break;
  560. case 1:
  561. /*
  562. * sr_status remains 1 if an RPC level error occurred.
  563. * The server may or may not have processed the sequence
  564. * operation..
  565. * Mark the slot as having hosted an interrupted RPC call.
  566. */
  567. slot->interrupted = 1;
  568. goto out;
  569. case -NFS4ERR_DELAY:
  570. /* The server detected a resend of the RPC call and
  571. * returned NFS4ERR_DELAY as per Section 2.10.6.2
  572. * of RFC5661.
  573. */
  574. dprintk("%s: slot=%u seq=%u: Operation in progress\n",
  575. __func__,
  576. slot->slot_nr,
  577. slot->seq_nr);
  578. goto out_retry;
  579. case -NFS4ERR_BADSLOT:
  580. /*
  581. * The slot id we used was probably retired. Try again
  582. * using a different slot id.
  583. */
  584. goto retry_nowait;
  585. case -NFS4ERR_SEQ_MISORDERED:
  586. /*
  587. * Was the last operation on this sequence interrupted?
  588. * If so, retry after bumping the sequence number.
  589. */
  590. if (interrupted) {
  591. ++slot->seq_nr;
  592. goto retry_nowait;
  593. }
  594. /*
  595. * Could this slot have been previously retired?
  596. * If so, then the server may be expecting seq_nr = 1!
  597. */
  598. if (slot->seq_nr != 1) {
  599. slot->seq_nr = 1;
  600. goto retry_nowait;
  601. }
  602. break;
  603. case -NFS4ERR_SEQ_FALSE_RETRY:
  604. ++slot->seq_nr;
  605. goto retry_nowait;
  606. default:
  607. /* Just update the slot sequence no. */
  608. ++slot->seq_nr;
  609. }
  610. out:
  611. /* The session may be reset by one of the error handlers. */
  612. dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
  613. nfs41_sequence_free_slot(res);
  614. out_noaction:
  615. return ret;
  616. retry_nowait:
  617. if (rpc_restart_call_prepare(task)) {
  618. task->tk_status = 0;
  619. ret = 0;
  620. }
  621. goto out;
  622. out_retry:
  623. if (!rpc_restart_call(task))
  624. goto out;
  625. rpc_delay(task, NFS4_POLL_RETRY_MAX);
  626. return 0;
  627. }
  628. EXPORT_SYMBOL_GPL(nfs41_sequence_done);
  629. int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
  630. {
  631. if (res->sr_slot == NULL)
  632. return 1;
  633. if (!res->sr_slot->table->session)
  634. return nfs40_sequence_done(task, res);
  635. return nfs41_sequence_done(task, res);
  636. }
  637. EXPORT_SYMBOL_GPL(nfs4_sequence_done);
  638. int nfs41_setup_sequence(struct nfs4_session *session,
  639. struct nfs4_sequence_args *args,
  640. struct nfs4_sequence_res *res,
  641. struct rpc_task *task)
  642. {
  643. struct nfs4_slot *slot;
  644. struct nfs4_slot_table *tbl;
  645. dprintk("--> %s\n", __func__);
  646. /* slot already allocated? */
  647. if (res->sr_slot != NULL)
  648. goto out_success;
  649. tbl = &session->fc_slot_table;
  650. task->tk_timeout = 0;
  651. spin_lock(&tbl->slot_tbl_lock);
  652. if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state) &&
  653. !args->sa_privileged) {
  654. /* The state manager will wait until the slot table is empty */
  655. dprintk("%s session is draining\n", __func__);
  656. goto out_sleep;
  657. }
  658. slot = nfs4_alloc_slot(tbl);
  659. if (IS_ERR(slot)) {
  660. /* If out of memory, try again in 1/4 second */
  661. if (slot == ERR_PTR(-ENOMEM))
  662. task->tk_timeout = HZ >> 2;
  663. dprintk("<-- %s: no free slots\n", __func__);
  664. goto out_sleep;
  665. }
  666. spin_unlock(&tbl->slot_tbl_lock);
  667. args->sa_slot = slot;
  668. dprintk("<-- %s slotid=%u seqid=%u\n", __func__,
  669. slot->slot_nr, slot->seq_nr);
  670. res->sr_slot = slot;
  671. res->sr_timestamp = jiffies;
  672. res->sr_status_flags = 0;
  673. /*
  674. * sr_status is only set in decode_sequence, and so will remain
  675. * set to 1 if an rpc level failure occurs.
  676. */
  677. res->sr_status = 1;
  678. trace_nfs4_setup_sequence(session, args);
  679. out_success:
  680. rpc_call_start(task);
  681. return 0;
  682. out_sleep:
  683. /* Privileged tasks are queued with top priority */
  684. if (args->sa_privileged)
  685. rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
  686. NULL, RPC_PRIORITY_PRIVILEGED);
  687. else
  688. rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
  689. spin_unlock(&tbl->slot_tbl_lock);
  690. return -EAGAIN;
  691. }
  692. EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
  693. static int nfs4_setup_sequence(const struct nfs_server *server,
  694. struct nfs4_sequence_args *args,
  695. struct nfs4_sequence_res *res,
  696. struct rpc_task *task)
  697. {
  698. struct nfs4_session *session = nfs4_get_session(server);
  699. int ret = 0;
  700. if (!session)
  701. return nfs40_setup_sequence(server->nfs_client->cl_slot_tbl,
  702. args, res, task);
  703. dprintk("--> %s clp %p session %p sr_slot %u\n",
  704. __func__, session->clp, session, res->sr_slot ?
  705. res->sr_slot->slot_nr : NFS4_NO_SLOT);
  706. ret = nfs41_setup_sequence(session, args, res, task);
  707. dprintk("<-- %s status=%d\n", __func__, ret);
  708. return ret;
  709. }
  710. static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
  711. {
  712. struct nfs4_call_sync_data *data = calldata;
  713. struct nfs4_session *session = nfs4_get_session(data->seq_server);
  714. dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
  715. nfs41_setup_sequence(session, data->seq_args, data->seq_res, task);
  716. }
  717. static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
  718. {
  719. struct nfs4_call_sync_data *data = calldata;
  720. nfs41_sequence_done(task, data->seq_res);
  721. }
  722. static const struct rpc_call_ops nfs41_call_sync_ops = {
  723. .rpc_call_prepare = nfs41_call_sync_prepare,
  724. .rpc_call_done = nfs41_call_sync_done,
  725. };
  726. #else /* !CONFIG_NFS_V4_1 */
  727. static int nfs4_setup_sequence(const struct nfs_server *server,
  728. struct nfs4_sequence_args *args,
  729. struct nfs4_sequence_res *res,
  730. struct rpc_task *task)
  731. {
  732. return nfs40_setup_sequence(server->nfs_client->cl_slot_tbl,
  733. args, res, task);
  734. }
  735. int nfs4_sequence_done(struct rpc_task *task,
  736. struct nfs4_sequence_res *res)
  737. {
  738. return nfs40_sequence_done(task, res);
  739. }
  740. EXPORT_SYMBOL_GPL(nfs4_sequence_done);
  741. #endif /* !CONFIG_NFS_V4_1 */
  742. static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
  743. {
  744. struct nfs4_call_sync_data *data = calldata;
  745. nfs4_setup_sequence(data->seq_server,
  746. data->seq_args, data->seq_res, task);
  747. }
  748. static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
  749. {
  750. struct nfs4_call_sync_data *data = calldata;
  751. nfs4_sequence_done(task, data->seq_res);
  752. }
  753. static const struct rpc_call_ops nfs40_call_sync_ops = {
  754. .rpc_call_prepare = nfs40_call_sync_prepare,
  755. .rpc_call_done = nfs40_call_sync_done,
  756. };
  757. static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
  758. struct nfs_server *server,
  759. struct rpc_message *msg,
  760. struct nfs4_sequence_args *args,
  761. struct nfs4_sequence_res *res)
  762. {
  763. int ret;
  764. struct rpc_task *task;
  765. struct nfs_client *clp = server->nfs_client;
  766. struct nfs4_call_sync_data data = {
  767. .seq_server = server,
  768. .seq_args = args,
  769. .seq_res = res,
  770. };
  771. struct rpc_task_setup task_setup = {
  772. .rpc_client = clnt,
  773. .rpc_message = msg,
  774. .callback_ops = clp->cl_mvops->call_sync_ops,
  775. .callback_data = &data
  776. };
  777. task = rpc_run_task(&task_setup);
  778. if (IS_ERR(task))
  779. ret = PTR_ERR(task);
  780. else {
  781. ret = task->tk_status;
  782. rpc_put_task(task);
  783. }
  784. return ret;
  785. }
  786. int nfs4_call_sync(struct rpc_clnt *clnt,
  787. struct nfs_server *server,
  788. struct rpc_message *msg,
  789. struct nfs4_sequence_args *args,
  790. struct nfs4_sequence_res *res,
  791. int cache_reply)
  792. {
  793. nfs4_init_sequence(args, res, cache_reply);
  794. return nfs4_call_sync_sequence(clnt, server, msg, args, res);
  795. }
  796. static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
  797. {
  798. struct nfs_inode *nfsi = NFS_I(dir);
  799. spin_lock(&dir->i_lock);
  800. nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
  801. if (!cinfo->atomic || cinfo->before != dir->i_version)
  802. nfs_force_lookup_revalidate(dir);
  803. dir->i_version = cinfo->after;
  804. nfsi->attr_gencount = nfs_inc_attr_generation_counter();
  805. nfs_fscache_invalidate(dir);
  806. spin_unlock(&dir->i_lock);
  807. }
  808. struct nfs4_opendata {
  809. struct kref kref;
  810. struct nfs_openargs o_arg;
  811. struct nfs_openres o_res;
  812. struct nfs_open_confirmargs c_arg;
  813. struct nfs_open_confirmres c_res;
  814. struct nfs4_string owner_name;
  815. struct nfs4_string group_name;
  816. struct nfs4_label *a_label;
  817. struct nfs_fattr f_attr;
  818. struct nfs4_label *f_label;
  819. struct dentry *dir;
  820. struct dentry *dentry;
  821. struct nfs4_state_owner *owner;
  822. struct nfs4_state *state;
  823. struct iattr attrs;
  824. unsigned long timestamp;
  825. unsigned int rpc_done : 1;
  826. unsigned int file_created : 1;
  827. unsigned int is_recover : 1;
  828. int rpc_status;
  829. int cancelled;
  830. };
  831. static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
  832. int err, struct nfs4_exception *exception)
  833. {
  834. if (err != -EINVAL)
  835. return false;
  836. if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
  837. return false;
  838. server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
  839. exception->retry = 1;
  840. return true;
  841. }
  842. static u32
  843. nfs4_map_atomic_open_share(struct nfs_server *server,
  844. fmode_t fmode, int openflags)
  845. {
  846. u32 res = 0;
  847. switch (fmode & (FMODE_READ | FMODE_WRITE)) {
  848. case FMODE_READ:
  849. res = NFS4_SHARE_ACCESS_READ;
  850. break;
  851. case FMODE_WRITE:
  852. res = NFS4_SHARE_ACCESS_WRITE;
  853. break;
  854. case FMODE_READ|FMODE_WRITE:
  855. res = NFS4_SHARE_ACCESS_BOTH;
  856. }
  857. if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
  858. goto out;
  859. /* Want no delegation if we're using O_DIRECT */
  860. if (openflags & O_DIRECT)
  861. res |= NFS4_SHARE_WANT_NO_DELEG;
  862. out:
  863. return res;
  864. }
  865. static enum open_claim_type4
  866. nfs4_map_atomic_open_claim(struct nfs_server *server,
  867. enum open_claim_type4 claim)
  868. {
  869. if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
  870. return claim;
  871. switch (claim) {
  872. default:
  873. return claim;
  874. case NFS4_OPEN_CLAIM_FH:
  875. return NFS4_OPEN_CLAIM_NULL;
  876. case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
  877. return NFS4_OPEN_CLAIM_DELEGATE_CUR;
  878. case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
  879. return NFS4_OPEN_CLAIM_DELEGATE_PREV;
  880. }
  881. }
  882. static void nfs4_init_opendata_res(struct nfs4_opendata *p)
  883. {
  884. p->o_res.f_attr = &p->f_attr;
  885. p->o_res.f_label = p->f_label;
  886. p->o_res.seqid = p->o_arg.seqid;
  887. p->c_res.seqid = p->c_arg.seqid;
  888. p->o_res.server = p->o_arg.server;
  889. p->o_res.access_request = p->o_arg.access;
  890. nfs_fattr_init(&p->f_attr);
  891. nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
  892. }
  893. static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
  894. struct nfs4_state_owner *sp, fmode_t fmode, int flags,
  895. const struct iattr *attrs,
  896. struct nfs4_label *label,
  897. enum open_claim_type4 claim,
  898. gfp_t gfp_mask)
  899. {
  900. struct dentry *parent = dget_parent(dentry);
  901. struct inode *dir = d_inode(parent);
  902. struct nfs_server *server = NFS_SERVER(dir);
  903. struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
  904. struct nfs4_opendata *p;
  905. p = kzalloc(sizeof(*p), gfp_mask);
  906. if (p == NULL)
  907. goto err;
  908. p->f_label = nfs4_label_alloc(server, gfp_mask);
  909. if (IS_ERR(p->f_label))
  910. goto err_free_p;
  911. p->a_label = nfs4_label_alloc(server, gfp_mask);
  912. if (IS_ERR(p->a_label))
  913. goto err_free_f;
  914. alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
  915. p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask);
  916. if (IS_ERR(p->o_arg.seqid))
  917. goto err_free_label;
  918. nfs_sb_active(dentry->d_sb);
  919. p->dentry = dget(dentry);
  920. p->dir = parent;
  921. p->owner = sp;
  922. atomic_inc(&sp->so_count);
  923. p->o_arg.open_flags = flags;
  924. p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
  925. p->o_arg.share_access = nfs4_map_atomic_open_share(server,
  926. fmode, flags);
  927. /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
  928. * will return permission denied for all bits until close */
  929. if (!(flags & O_EXCL)) {
  930. /* ask server to check for all possible rights as results
  931. * are cached */
  932. p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
  933. NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
  934. }
  935. p->o_arg.clientid = server->nfs_client->cl_clientid;
  936. p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
  937. p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
  938. p->o_arg.name = &dentry->d_name;
  939. p->o_arg.server = server;
  940. p->o_arg.bitmask = nfs4_bitmask(server, label);
  941. p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
  942. p->o_arg.label = nfs4_label_copy(p->a_label, label);
  943. p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
  944. switch (p->o_arg.claim) {
  945. case NFS4_OPEN_CLAIM_NULL:
  946. case NFS4_OPEN_CLAIM_DELEGATE_CUR:
  947. case NFS4_OPEN_CLAIM_DELEGATE_PREV:
  948. p->o_arg.fh = NFS_FH(dir);
  949. break;
  950. case NFS4_OPEN_CLAIM_PREVIOUS:
  951. case NFS4_OPEN_CLAIM_FH:
  952. case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
  953. case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
  954. p->o_arg.fh = NFS_FH(d_inode(dentry));
  955. }
  956. if (attrs != NULL && attrs->ia_valid != 0) {
  957. __u32 verf[2];
  958. p->o_arg.u.attrs = &p->attrs;
  959. memcpy(&p->attrs, attrs, sizeof(p->attrs));
  960. verf[0] = jiffies;
  961. verf[1] = current->pid;
  962. memcpy(p->o_arg.u.verifier.data, verf,
  963. sizeof(p->o_arg.u.verifier.data));
  964. }
  965. p->c_arg.fh = &p->o_res.fh;
  966. p->c_arg.stateid = &p->o_res.stateid;
  967. p->c_arg.seqid = p->o_arg.seqid;
  968. nfs4_init_opendata_res(p);
  969. kref_init(&p->kref);
  970. return p;
  971. err_free_label:
  972. nfs4_label_free(p->a_label);
  973. err_free_f:
  974. nfs4_label_free(p->f_label);
  975. err_free_p:
  976. kfree(p);
  977. err:
  978. dput(parent);
  979. return NULL;
  980. }
  981. static void nfs4_opendata_free(struct kref *kref)
  982. {
  983. struct nfs4_opendata *p = container_of(kref,
  984. struct nfs4_opendata, kref);
  985. struct super_block *sb = p->dentry->d_sb;
  986. nfs_free_seqid(p->o_arg.seqid);
  987. if (p->state != NULL)
  988. nfs4_put_open_state(p->state);
  989. nfs4_put_state_owner(p->owner);
  990. nfs4_label_free(p->a_label);
  991. nfs4_label_free(p->f_label);
  992. dput(p->dir);
  993. dput(p->dentry);
  994. nfs_sb_deactive(sb);
  995. nfs_fattr_free_names(&p->f_attr);
  996. kfree(p->f_attr.mdsthreshold);
  997. kfree(p);
  998. }
  999. static void nfs4_opendata_put(struct nfs4_opendata *p)
  1000. {
  1001. if (p != NULL)
  1002. kref_put(&p->kref, nfs4_opendata_free);
  1003. }
  1004. static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
  1005. {
  1006. int ret;
  1007. ret = rpc_wait_for_completion_task(task);
  1008. return ret;
  1009. }
  1010. static bool nfs4_mode_match_open_stateid(struct nfs4_state *state,
  1011. fmode_t fmode)
  1012. {
  1013. switch(fmode & (FMODE_READ|FMODE_WRITE)) {
  1014. case FMODE_READ|FMODE_WRITE:
  1015. return state->n_rdwr != 0;
  1016. case FMODE_WRITE:
  1017. return state->n_wronly != 0;
  1018. case FMODE_READ:
  1019. return state->n_rdonly != 0;
  1020. }
  1021. WARN_ON_ONCE(1);
  1022. return false;
  1023. }
  1024. static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
  1025. {
  1026. int ret = 0;
  1027. if (open_mode & (O_EXCL|O_TRUNC))
  1028. goto out;
  1029. switch (mode & (FMODE_READ|FMODE_WRITE)) {
  1030. case FMODE_READ:
  1031. ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
  1032. && state->n_rdonly != 0;
  1033. break;
  1034. case FMODE_WRITE:
  1035. ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
  1036. && state->n_wronly != 0;
  1037. break;
  1038. case FMODE_READ|FMODE_WRITE:
  1039. ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
  1040. && state->n_rdwr != 0;
  1041. }
  1042. out:
  1043. return ret;
  1044. }
  1045. static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode,
  1046. enum open_claim_type4 claim)
  1047. {
  1048. if (delegation == NULL)
  1049. return 0;
  1050. if ((delegation->type & fmode) != fmode)
  1051. return 0;
  1052. if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
  1053. return 0;
  1054. switch (claim) {
  1055. case NFS4_OPEN_CLAIM_NULL:
  1056. case NFS4_OPEN_CLAIM_FH:
  1057. break;
  1058. case NFS4_OPEN_CLAIM_PREVIOUS:
  1059. if (!test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
  1060. break;
  1061. default:
  1062. return 0;
  1063. }
  1064. nfs_mark_delegation_referenced(delegation);
  1065. return 1;
  1066. }
  1067. static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
  1068. {
  1069. switch (fmode) {
  1070. case FMODE_WRITE:
  1071. state->n_wronly++;
  1072. break;
  1073. case FMODE_READ:
  1074. state->n_rdonly++;
  1075. break;
  1076. case FMODE_READ|FMODE_WRITE:
  1077. state->n_rdwr++;
  1078. }
  1079. nfs4_state_set_mode_locked(state, state->state | fmode);
  1080. }
  1081. static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state)
  1082. {
  1083. struct nfs_client *clp = state->owner->so_server->nfs_client;
  1084. bool need_recover = false;
  1085. if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly)
  1086. need_recover = true;
  1087. if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly)
  1088. need_recover = true;
  1089. if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr)
  1090. need_recover = true;
  1091. if (need_recover)
  1092. nfs4_state_mark_reclaim_nograce(clp, state);
  1093. }
  1094. static bool nfs_need_update_open_stateid(struct nfs4_state *state,
  1095. nfs4_stateid *stateid)
  1096. {
  1097. if (test_and_set_bit(NFS_OPEN_STATE, &state->flags) == 0)
  1098. return true;
  1099. if (!nfs4_stateid_match_other(stateid, &state->open_stateid)) {
  1100. nfs_test_and_clear_all_open_stateid(state);
  1101. return true;
  1102. }
  1103. if (nfs4_stateid_is_newer(stateid, &state->open_stateid))
  1104. return true;
  1105. return false;
  1106. }
  1107. static void nfs_resync_open_stateid_locked(struct nfs4_state *state)
  1108. {
  1109. if (!(state->n_wronly || state->n_rdonly || state->n_rdwr))
  1110. return;
  1111. if (state->n_wronly)
  1112. set_bit(NFS_O_WRONLY_STATE, &state->flags);
  1113. if (state->n_rdonly)
  1114. set_bit(NFS_O_RDONLY_STATE, &state->flags);
  1115. if (state->n_rdwr)
  1116. set_bit(NFS_O_RDWR_STATE, &state->flags);
  1117. set_bit(NFS_OPEN_STATE, &state->flags);
  1118. }
  1119. static void nfs_clear_open_stateid_locked(struct nfs4_state *state,
  1120. nfs4_stateid *arg_stateid,
  1121. nfs4_stateid *stateid, fmode_t fmode)
  1122. {
  1123. clear_bit(NFS_O_RDWR_STATE, &state->flags);
  1124. switch (fmode & (FMODE_READ|FMODE_WRITE)) {
  1125. case FMODE_WRITE:
  1126. clear_bit(NFS_O_RDONLY_STATE, &state->flags);
  1127. break;
  1128. case FMODE_READ:
  1129. clear_bit(NFS_O_WRONLY_STATE, &state->flags);
  1130. break;
  1131. case 0:
  1132. clear_bit(NFS_O_RDONLY_STATE, &state->flags);
  1133. clear_bit(NFS_O_WRONLY_STATE, &state->flags);
  1134. clear_bit(NFS_OPEN_STATE, &state->flags);
  1135. }
  1136. if (stateid == NULL)
  1137. return;
  1138. /* Handle races with OPEN */
  1139. if (!nfs4_stateid_match_other(arg_stateid, &state->open_stateid) ||
  1140. (nfs4_stateid_match_other(stateid, &state->open_stateid) &&
  1141. !nfs4_stateid_is_newer(stateid, &state->open_stateid))) {
  1142. nfs_resync_open_stateid_locked(state);
  1143. return;
  1144. }
  1145. if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
  1146. nfs4_stateid_copy(&state->stateid, stateid);
  1147. nfs4_stateid_copy(&state->open_stateid, stateid);
  1148. }
  1149. static void nfs_clear_open_stateid(struct nfs4_state *state,
  1150. nfs4_stateid *arg_stateid,
  1151. nfs4_stateid *stateid, fmode_t fmode)
  1152. {
  1153. write_seqlock(&state->seqlock);
  1154. nfs_clear_open_stateid_locked(state, arg_stateid, stateid, fmode);
  1155. write_sequnlock(&state->seqlock);
  1156. if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
  1157. nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
  1158. }
  1159. static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
  1160. {
  1161. switch (fmode) {
  1162. case FMODE_READ:
  1163. set_bit(NFS_O_RDONLY_STATE, &state->flags);
  1164. break;
  1165. case FMODE_WRITE:
  1166. set_bit(NFS_O_WRONLY_STATE, &state->flags);
  1167. break;
  1168. case FMODE_READ|FMODE_WRITE:
  1169. set_bit(NFS_O_RDWR_STATE, &state->flags);
  1170. }
  1171. if (!nfs_need_update_open_stateid(state, stateid))
  1172. return;
  1173. if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
  1174. nfs4_stateid_copy(&state->stateid, stateid);
  1175. nfs4_stateid_copy(&state->open_stateid, stateid);
  1176. }
  1177. static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
  1178. {
  1179. /*
  1180. * Protect the call to nfs4_state_set_mode_locked and
  1181. * serialise the stateid update
  1182. */
  1183. write_seqlock(&state->seqlock);
  1184. if (deleg_stateid != NULL) {
  1185. nfs4_stateid_copy(&state->stateid, deleg_stateid);
  1186. set_bit(NFS_DELEGATED_STATE, &state->flags);
  1187. }
  1188. if (open_stateid != NULL)
  1189. nfs_set_open_stateid_locked(state, open_stateid, fmode);
  1190. write_sequnlock(&state->seqlock);
  1191. spin_lock(&state->owner->so_lock);
  1192. update_open_stateflags(state, fmode);
  1193. spin_unlock(&state->owner->so_lock);
  1194. }
  1195. static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
  1196. {
  1197. struct nfs_inode *nfsi = NFS_I(state->inode);
  1198. struct nfs_delegation *deleg_cur;
  1199. int ret = 0;
  1200. fmode &= (FMODE_READ|FMODE_WRITE);
  1201. rcu_read_lock();
  1202. deleg_cur = rcu_dereference(nfsi->delegation);
  1203. if (deleg_cur == NULL)
  1204. goto no_delegation;
  1205. spin_lock(&deleg_cur->lock);
  1206. if (rcu_dereference(nfsi->delegation) != deleg_cur ||
  1207. test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
  1208. (deleg_cur->type & fmode) != fmode)
  1209. goto no_delegation_unlock;
  1210. if (delegation == NULL)
  1211. delegation = &deleg_cur->stateid;
  1212. else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
  1213. goto no_delegation_unlock;
  1214. nfs_mark_delegation_referenced(deleg_cur);
  1215. __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
  1216. ret = 1;
  1217. no_delegation_unlock:
  1218. spin_unlock(&deleg_cur->lock);
  1219. no_delegation:
  1220. rcu_read_unlock();
  1221. if (!ret && open_stateid != NULL) {
  1222. __update_open_stateid(state, open_stateid, NULL, fmode);
  1223. ret = 1;
  1224. }
  1225. if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
  1226. nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
  1227. return ret;
  1228. }
  1229. static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp,
  1230. const nfs4_stateid *stateid)
  1231. {
  1232. struct nfs4_state *state = lsp->ls_state;
  1233. bool ret = false;
  1234. spin_lock(&state->state_lock);
  1235. if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid))
  1236. goto out_noupdate;
  1237. if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid))
  1238. goto out_noupdate;
  1239. nfs4_stateid_copy(&lsp->ls_stateid, stateid);
  1240. ret = true;
  1241. out_noupdate:
  1242. spin_unlock(&state->state_lock);
  1243. return ret;
  1244. }
  1245. static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
  1246. {
  1247. struct nfs_delegation *delegation;
  1248. rcu_read_lock();
  1249. delegation = rcu_dereference(NFS_I(inode)->delegation);
  1250. if (delegation == NULL || (delegation->type & fmode) == fmode) {
  1251. rcu_read_unlock();
  1252. return;
  1253. }
  1254. rcu_read_unlock();
  1255. nfs4_inode_return_delegation(inode);
  1256. }
  1257. static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
  1258. {
  1259. struct nfs4_state *state = opendata->state;
  1260. struct nfs_inode *nfsi = NFS_I(state->inode);
  1261. struct nfs_delegation *delegation;
  1262. int open_mode = opendata->o_arg.open_flags;
  1263. fmode_t fmode = opendata->o_arg.fmode;
  1264. enum open_claim_type4 claim = opendata->o_arg.claim;
  1265. nfs4_stateid stateid;
  1266. int ret = -EAGAIN;
  1267. for (;;) {
  1268. spin_lock(&state->owner->so_lock);
  1269. if (can_open_cached(state, fmode, open_mode)) {
  1270. update_open_stateflags(state, fmode);
  1271. spin_unlock(&state->owner->so_lock);
  1272. goto out_return_state;
  1273. }
  1274. spin_unlock(&state->owner->so_lock);
  1275. rcu_read_lock();
  1276. delegation = rcu_dereference(nfsi->delegation);
  1277. if (!can_open_delegated(delegation, fmode, claim)) {
  1278. rcu_read_unlock();
  1279. break;
  1280. }
  1281. /* Save the delegation */
  1282. nfs4_stateid_copy(&stateid, &delegation->stateid);
  1283. rcu_read_unlock();
  1284. nfs_release_seqid(opendata->o_arg.seqid);
  1285. if (!opendata->is_recover) {
  1286. ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
  1287. if (ret != 0)
  1288. goto out;
  1289. }
  1290. ret = -EAGAIN;
  1291. /* Try to update the stateid using the delegation */
  1292. if (update_open_stateid(state, NULL, &stateid, fmode))
  1293. goto out_return_state;
  1294. }
  1295. out:
  1296. return ERR_PTR(ret);
  1297. out_return_state:
  1298. atomic_inc(&state->count);
  1299. return state;
  1300. }
  1301. static void
  1302. nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
  1303. {
  1304. struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
  1305. struct nfs_delegation *delegation;
  1306. int delegation_flags = 0;
  1307. rcu_read_lock();
  1308. delegation = rcu_dereference(NFS_I(state->inode)->delegation);
  1309. if (delegation)
  1310. delegation_flags = delegation->flags;
  1311. rcu_read_unlock();
  1312. if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
  1313. pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
  1314. "returning a delegation for "
  1315. "OPEN(CLAIM_DELEGATE_CUR)\n",
  1316. clp->cl_hostname);
  1317. } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
  1318. nfs_inode_set_delegation(state->inode,
  1319. data->owner->so_cred,
  1320. &data->o_res);
  1321. else
  1322. nfs_inode_reclaim_delegation(state->inode,
  1323. data->owner->so_cred,
  1324. &data->o_res);
  1325. }
  1326. /*
  1327. * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
  1328. * and update the nfs4_state.
  1329. */
  1330. static struct nfs4_state *
  1331. _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
  1332. {
  1333. struct inode *inode = data->state->inode;
  1334. struct nfs4_state *state = data->state;
  1335. int ret;
  1336. if (!data->rpc_done) {
  1337. if (data->rpc_status) {
  1338. ret = data->rpc_status;
  1339. goto err;
  1340. }
  1341. /* cached opens have already been processed */
  1342. goto update;
  1343. }
  1344. ret = nfs_refresh_inode(inode, &data->f_attr);
  1345. if (ret)
  1346. goto err;
  1347. if (data->o_res.delegation_type != 0)
  1348. nfs4_opendata_check_deleg(data, state);
  1349. update:
  1350. update_open_stateid(state, &data->o_res.stateid, NULL,
  1351. data->o_arg.fmode);
  1352. atomic_inc(&state->count);
  1353. return state;
  1354. err:
  1355. return ERR_PTR(ret);
  1356. }
  1357. static struct nfs4_state *
  1358. _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
  1359. {
  1360. struct inode *inode;
  1361. struct nfs4_state *state = NULL;
  1362. int ret;
  1363. if (!data->rpc_done) {
  1364. state = nfs4_try_open_cached(data);
  1365. goto out;
  1366. }
  1367. ret = -EAGAIN;
  1368. if (!(data->f_attr.valid & NFS_ATTR_FATTR))
  1369. goto err;
  1370. inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr, data->f_label);
  1371. ret = PTR_ERR(inode);
  1372. if (IS_ERR(inode))
  1373. goto err;
  1374. ret = -ENOMEM;
  1375. state = nfs4_get_open_state(inode, data->owner);
  1376. if (state == NULL)
  1377. goto err_put_inode;
  1378. if (data->o_res.delegation_type != 0)
  1379. nfs4_opendata_check_deleg(data, state);
  1380. update_open_stateid(state, &data->o_res.stateid, NULL,
  1381. data->o_arg.fmode);
  1382. iput(inode);
  1383. out:
  1384. nfs_release_seqid(data->o_arg.seqid);
  1385. return state;
  1386. err_put_inode:
  1387. iput(inode);
  1388. err:
  1389. return ERR_PTR(ret);
  1390. }
  1391. static struct nfs4_state *
  1392. nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
  1393. {
  1394. if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
  1395. return _nfs4_opendata_reclaim_to_nfs4_state(data);
  1396. return _nfs4_opendata_to_nfs4_state(data);
  1397. }
  1398. static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
  1399. {
  1400. struct nfs_inode *nfsi = NFS_I(state->inode);
  1401. struct nfs_open_context *ctx;
  1402. spin_lock(&state->inode->i_lock);
  1403. list_for_each_entry(ctx, &nfsi->open_files, list) {
  1404. if (ctx->state != state)
  1405. continue;
  1406. get_nfs_open_context(ctx);
  1407. spin_unlock(&state->inode->i_lock);
  1408. return ctx;
  1409. }
  1410. spin_unlock(&state->inode->i_lock);
  1411. return ERR_PTR(-ENOENT);
  1412. }
  1413. static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
  1414. struct nfs4_state *state, enum open_claim_type4 claim)
  1415. {
  1416. struct nfs4_opendata *opendata;
  1417. opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
  1418. NULL, NULL, claim, GFP_NOFS);
  1419. if (opendata == NULL)
  1420. return ERR_PTR(-ENOMEM);
  1421. opendata->state = state;
  1422. atomic_inc(&state->count);
  1423. return opendata;
  1424. }
  1425. static int nfs4_open_recover_helper(struct nfs4_opendata *opendata,
  1426. fmode_t fmode)
  1427. {
  1428. struct nfs4_state *newstate;
  1429. int ret;
  1430. if (!nfs4_mode_match_open_stateid(opendata->state, fmode))
  1431. return 0;
  1432. opendata->o_arg.open_flags = 0;
  1433. opendata->o_arg.fmode = fmode;
  1434. opendata->o_arg.share_access = nfs4_map_atomic_open_share(
  1435. NFS_SB(opendata->dentry->d_sb),
  1436. fmode, 0);
  1437. memset(&opendata->o_res, 0, sizeof(opendata->o_res));
  1438. memset(&opendata->c_res, 0, sizeof(opendata->c_res));
  1439. nfs4_init_opendata_res(opendata);
  1440. ret = _nfs4_recover_proc_open(opendata);
  1441. if (ret != 0)
  1442. return ret;
  1443. newstate = nfs4_opendata_to_nfs4_state(opendata);
  1444. if (IS_ERR(newstate))
  1445. return PTR_ERR(newstate);
  1446. if (newstate != opendata->state)
  1447. ret = -ESTALE;
  1448. nfs4_close_state(newstate, fmode);
  1449. return ret;
  1450. }
  1451. static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
  1452. {
  1453. int ret;
  1454. /* Don't trigger recovery in nfs_test_and_clear_all_open_stateid */
  1455. clear_bit(NFS_O_RDWR_STATE, &state->flags);
  1456. clear_bit(NFS_O_WRONLY_STATE, &state->flags);
  1457. clear_bit(NFS_O_RDONLY_STATE, &state->flags);
  1458. /* memory barrier prior to reading state->n_* */
  1459. clear_bit(NFS_DELEGATED_STATE, &state->flags);
  1460. clear_bit(NFS_OPEN_STATE, &state->flags);
  1461. smp_rmb();
  1462. ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
  1463. if (ret != 0)
  1464. return ret;
  1465. ret = nfs4_open_recover_helper(opendata, FMODE_WRITE);
  1466. if (ret != 0)
  1467. return ret;
  1468. ret = nfs4_open_recover_helper(opendata, FMODE_READ);
  1469. if (ret != 0)
  1470. return ret;
  1471. /*
  1472. * We may have performed cached opens for all three recoveries.
  1473. * Check if we need to update the current stateid.
  1474. */
  1475. if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
  1476. !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
  1477. write_seqlock(&state->seqlock);
  1478. if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
  1479. nfs4_stateid_copy(&state->stateid, &state->open_stateid);
  1480. write_sequnlock(&state->seqlock);
  1481. }
  1482. return 0;
  1483. }
  1484. /*
  1485. * OPEN_RECLAIM:
  1486. * reclaim state on the server after a reboot.
  1487. */
  1488. static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
  1489. {
  1490. struct nfs_delegation *delegation;
  1491. struct nfs4_opendata *opendata;
  1492. fmode_t delegation_type = 0;
  1493. int status;
  1494. opendata = nfs4_open_recoverdata_alloc(ctx, state,
  1495. NFS4_OPEN_CLAIM_PREVIOUS);
  1496. if (IS_ERR(opendata))
  1497. return PTR_ERR(opendata);
  1498. rcu_read_lock();
  1499. delegation = rcu_dereference(NFS_I(state->inode)->delegation);
  1500. if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
  1501. delegation_type = delegation->type;
  1502. rcu_read_unlock();
  1503. opendata->o_arg.u.delegation_type = delegation_type;
  1504. status = nfs4_open_recover(opendata, state);
  1505. nfs4_opendata_put(opendata);
  1506. return status;
  1507. }
  1508. static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
  1509. {
  1510. struct nfs_server *server = NFS_SERVER(state->inode);
  1511. struct nfs4_exception exception = { };
  1512. int err;
  1513. do {
  1514. err = _nfs4_do_open_reclaim(ctx, state);
  1515. trace_nfs4_open_reclaim(ctx, 0, err);
  1516. if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
  1517. continue;
  1518. if (err != -NFS4ERR_DELAY)
  1519. break;
  1520. nfs4_handle_exception(server, err, &exception);
  1521. } while (exception.retry);
  1522. return err;
  1523. }
  1524. static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
  1525. {
  1526. struct nfs_open_context *ctx;
  1527. int ret;
  1528. ctx = nfs4_state_find_open_context(state);
  1529. if (IS_ERR(ctx))
  1530. return -EAGAIN;
  1531. ret = nfs4_do_open_reclaim(ctx, state);
  1532. put_nfs_open_context(ctx);
  1533. return ret;
  1534. }
  1535. static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, int err)
  1536. {
  1537. switch (err) {
  1538. default:
  1539. printk(KERN_ERR "NFS: %s: unhandled error "
  1540. "%d.\n", __func__, err);
  1541. case 0:
  1542. case -ENOENT:
  1543. case -EAGAIN:
  1544. case -ESTALE:
  1545. break;
  1546. case -NFS4ERR_BADSESSION:
  1547. case -NFS4ERR_BADSLOT:
  1548. case -NFS4ERR_BAD_HIGH_SLOT:
  1549. case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
  1550. case -NFS4ERR_DEADSESSION:
  1551. set_bit(NFS_DELEGATED_STATE, &state->flags);
  1552. nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
  1553. return -EAGAIN;
  1554. case -NFS4ERR_STALE_CLIENTID:
  1555. case -NFS4ERR_STALE_STATEID:
  1556. set_bit(NFS_DELEGATED_STATE, &state->flags);
  1557. case -NFS4ERR_EXPIRED:
  1558. /* Don't recall a delegation if it was lost */
  1559. nfs4_schedule_lease_recovery(server->nfs_client);
  1560. return -EAGAIN;
  1561. case -NFS4ERR_MOVED:
  1562. nfs4_schedule_migration_recovery(server);
  1563. return -EAGAIN;
  1564. case -NFS4ERR_LEASE_MOVED:
  1565. nfs4_schedule_lease_moved_recovery(server->nfs_client);
  1566. return -EAGAIN;
  1567. case -NFS4ERR_DELEG_REVOKED:
  1568. case -NFS4ERR_ADMIN_REVOKED:
  1569. case -NFS4ERR_BAD_STATEID:
  1570. case -NFS4ERR_OPENMODE:
  1571. nfs_inode_find_state_and_recover(state->inode,
  1572. stateid);
  1573. nfs4_schedule_stateid_recovery(server, state);
  1574. return -EAGAIN;
  1575. case -NFS4ERR_DELAY:
  1576. case -NFS4ERR_GRACE:
  1577. set_bit(NFS_DELEGATED_STATE, &state->flags);
  1578. ssleep(1);
  1579. return -EAGAIN;
  1580. case -ENOMEM:
  1581. case -NFS4ERR_DENIED:
  1582. /* kill_proc(fl->fl_pid, SIGLOST, 1); */
  1583. return 0;
  1584. }
  1585. return err;
  1586. }
  1587. int nfs4_open_delegation_recall(struct nfs_open_context *ctx,
  1588. struct nfs4_state *state, const nfs4_stateid *stateid,
  1589. fmode_t type)
  1590. {
  1591. struct nfs_server *server = NFS_SERVER(state->inode);
  1592. struct nfs4_opendata *opendata;
  1593. int err = 0;
  1594. opendata = nfs4_open_recoverdata_alloc(ctx, state,
  1595. NFS4_OPEN_CLAIM_DELEG_CUR_FH);
  1596. if (IS_ERR(opendata))
  1597. return PTR_ERR(opendata);
  1598. nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
  1599. clear_bit(NFS_DELEGATED_STATE, &state->flags);
  1600. switch (type & (FMODE_READ|FMODE_WRITE)) {
  1601. case FMODE_READ|FMODE_WRITE:
  1602. case FMODE_WRITE:
  1603. err = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
  1604. if (err)
  1605. break;
  1606. err = nfs4_open_recover_helper(opendata, FMODE_WRITE);
  1607. if (err)
  1608. break;
  1609. case FMODE_READ:
  1610. err = nfs4_open_recover_helper(opendata, FMODE_READ);
  1611. }
  1612. nfs4_opendata_put(opendata);
  1613. return nfs4_handle_delegation_recall_error(server, state, stateid, err);
  1614. }
  1615. static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
  1616. {
  1617. struct nfs4_opendata *data = calldata;
  1618. nfs40_setup_sequence(data->o_arg.server->nfs_client->cl_slot_tbl,
  1619. &data->c_arg.seq_args, &data->c_res.seq_res, task);
  1620. }
  1621. static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
  1622. {
  1623. struct nfs4_opendata *data = calldata;
  1624. nfs40_sequence_done(task, &data->c_res.seq_res);
  1625. data->rpc_status = task->tk_status;
  1626. if (data->rpc_status == 0) {
  1627. nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
  1628. nfs_confirm_seqid(&data->owner->so_seqid, 0);
  1629. renew_lease(data->o_res.server, data->timestamp);
  1630. data->rpc_done = 1;
  1631. }
  1632. }
  1633. static void nfs4_open_confirm_release(void *calldata)
  1634. {
  1635. struct nfs4_opendata *data = calldata;
  1636. struct nfs4_state *state = NULL;
  1637. /* If this request hasn't been cancelled, do nothing */
  1638. if (data->cancelled == 0)
  1639. goto out_free;
  1640. /* In case of error, no cleanup! */
  1641. if (!data->rpc_done)
  1642. goto out_free;
  1643. state = nfs4_opendata_to_nfs4_state(data);
  1644. if (!IS_ERR(state))
  1645. nfs4_close_state(state, data->o_arg.fmode);
  1646. out_free:
  1647. nfs4_opendata_put(data);
  1648. }
  1649. static const struct rpc_call_ops nfs4_open_confirm_ops = {
  1650. .rpc_call_prepare = nfs4_open_confirm_prepare,
  1651. .rpc_call_done = nfs4_open_confirm_done,
  1652. .rpc_release = nfs4_open_confirm_release,
  1653. };
  1654. /*
  1655. * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
  1656. */
  1657. static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
  1658. {
  1659. struct nfs_server *server = NFS_SERVER(d_inode(data->dir));
  1660. struct rpc_task *task;
  1661. struct rpc_message msg = {
  1662. .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
  1663. .rpc_argp = &data->c_arg,
  1664. .rpc_resp = &data->c_res,
  1665. .rpc_cred = data->owner->so_cred,
  1666. };
  1667. struct rpc_task_setup task_setup_data = {
  1668. .rpc_client = server->client,
  1669. .rpc_message = &msg,
  1670. .callback_ops = &nfs4_open_confirm_ops,
  1671. .callback_data = data,
  1672. .workqueue = nfsiod_workqueue,
  1673. .flags = RPC_TASK_ASYNC,
  1674. };
  1675. int status;
  1676. nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1);
  1677. kref_get(&data->kref);
  1678. data->rpc_done = 0;
  1679. data->rpc_status = 0;
  1680. data->timestamp = jiffies;
  1681. task = rpc_run_task(&task_setup_data);
  1682. if (IS_ERR(task))
  1683. return PTR_ERR(task);
  1684. status = nfs4_wait_for_completion_rpc_task(task);
  1685. if (status != 0) {
  1686. data->cancelled = 1;
  1687. smp_wmb();
  1688. } else
  1689. status = data->rpc_status;
  1690. rpc_put_task(task);
  1691. return status;
  1692. }
  1693. static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
  1694. {
  1695. struct nfs4_opendata *data = calldata;
  1696. struct nfs4_state_owner *sp = data->owner;
  1697. struct nfs_client *clp = sp->so_server->nfs_client;
  1698. enum open_claim_type4 claim = data->o_arg.claim;
  1699. if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
  1700. goto out_wait;
  1701. /*
  1702. * Check if we still need to send an OPEN call, or if we can use
  1703. * a delegation instead.
  1704. */
  1705. if (data->state != NULL) {
  1706. struct nfs_delegation *delegation;
  1707. if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
  1708. goto out_no_action;
  1709. rcu_read_lock();
  1710. delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
  1711. if (can_open_delegated(delegation, data->o_arg.fmode, claim))
  1712. goto unlock_no_action;
  1713. rcu_read_unlock();
  1714. }
  1715. /* Update client id. */
  1716. data->o_arg.clientid = clp->cl_clientid;
  1717. switch (claim) {
  1718. default:
  1719. break;
  1720. case NFS4_OPEN_CLAIM_PREVIOUS:
  1721. case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
  1722. case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
  1723. data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
  1724. case NFS4_OPEN_CLAIM_FH:
  1725. task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
  1726. nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
  1727. }
  1728. data->timestamp = jiffies;
  1729. if (nfs4_setup_sequence(data->o_arg.server,
  1730. &data->o_arg.seq_args,
  1731. &data->o_res.seq_res,
  1732. task) != 0)
  1733. nfs_release_seqid(data->o_arg.seqid);
  1734. /* Set the create mode (note dependency on the session type) */
  1735. data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
  1736. if (data->o_arg.open_flags & O_EXCL) {
  1737. data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
  1738. if (nfs4_has_persistent_session(clp))
  1739. data->o_arg.createmode = NFS4_CREATE_GUARDED;
  1740. else if (clp->cl_mvops->minor_version > 0)
  1741. data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
  1742. }
  1743. return;
  1744. unlock_no_action:
  1745. rcu_read_unlock();
  1746. out_no_action:
  1747. task->tk_action = NULL;
  1748. out_wait:
  1749. nfs4_sequence_done(task, &data->o_res.seq_res);
  1750. }
  1751. static void nfs4_open_done(struct rpc_task *task, void *calldata)
  1752. {
  1753. struct nfs4_opendata *data = calldata;
  1754. data->rpc_status = task->tk_status;
  1755. if (!nfs4_sequence_done(task, &data->o_res.seq_res))
  1756. return;
  1757. if (task->tk_status == 0) {
  1758. if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
  1759. switch (data->o_res.f_attr->mode & S_IFMT) {
  1760. case S_IFREG:
  1761. break;
  1762. case S_IFLNK:
  1763. data->rpc_status = -ELOOP;
  1764. break;
  1765. case S_IFDIR:
  1766. data->rpc_status = -EISDIR;
  1767. break;
  1768. default:
  1769. data->rpc_status = -ENOTDIR;
  1770. }
  1771. }
  1772. renew_lease(data->o_res.server, data->timestamp);
  1773. if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
  1774. nfs_confirm_seqid(&data->owner->so_seqid, 0);
  1775. }
  1776. data->rpc_done = 1;
  1777. }
  1778. static void nfs4_open_release(void *calldata)
  1779. {
  1780. struct nfs4_opendata *data = calldata;
  1781. struct nfs4_state *state = NULL;
  1782. /* If this request hasn't been cancelled, do nothing */
  1783. if (data->cancelled == 0)
  1784. goto out_free;
  1785. /* In case of error, no cleanup! */
  1786. if (data->rpc_status != 0 || !data->rpc_done)
  1787. goto out_free;
  1788. /* In case we need an open_confirm, no cleanup! */
  1789. if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
  1790. goto out_free;
  1791. state = nfs4_opendata_to_nfs4_state(data);
  1792. if (!IS_ERR(state))
  1793. nfs4_close_state(state, data->o_arg.fmode);
  1794. out_free:
  1795. nfs4_opendata_put(data);
  1796. }
  1797. static const struct rpc_call_ops nfs4_open_ops = {
  1798. .rpc_call_prepare = nfs4_open_prepare,
  1799. .rpc_call_done = nfs4_open_done,
  1800. .rpc_release = nfs4_open_release,
  1801. };
  1802. static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
  1803. {
  1804. struct inode *dir = d_inode(data->dir);
  1805. struct nfs_server *server = NFS_SERVER(dir);
  1806. struct nfs_openargs *o_arg = &data->o_arg;
  1807. struct nfs_openres *o_res = &data->o_res;
  1808. struct rpc_task *task;
  1809. struct rpc_message msg = {
  1810. .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
  1811. .rpc_argp = o_arg,
  1812. .rpc_resp = o_res,
  1813. .rpc_cred = data->owner->so_cred,
  1814. };
  1815. struct rpc_task_setup task_setup_data = {
  1816. .rpc_client = server->client,
  1817. .rpc_message = &msg,
  1818. .callback_ops = &nfs4_open_ops,
  1819. .callback_data = data,
  1820. .workqueue = nfsiod_workqueue,
  1821. .flags = RPC_TASK_ASYNC,
  1822. };
  1823. int status;
  1824. nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
  1825. kref_get(&data->kref);
  1826. data->rpc_done = 0;
  1827. data->rpc_status = 0;
  1828. data->cancelled = 0;
  1829. data->is_recover = 0;
  1830. if (isrecover) {
  1831. nfs4_set_sequence_privileged(&o_arg->seq_args);
  1832. data->is_recover = 1;
  1833. }
  1834. task = rpc_run_task(&task_setup_data);
  1835. if (IS_ERR(task))
  1836. return PTR_ERR(task);
  1837. status = nfs4_wait_for_completion_rpc_task(task);
  1838. if (status != 0) {
  1839. data->cancelled = 1;
  1840. smp_wmb();
  1841. } else
  1842. status = data->rpc_status;
  1843. rpc_put_task(task);
  1844. return status;
  1845. }
  1846. static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
  1847. {
  1848. struct inode *dir = d_inode(data->dir);
  1849. struct nfs_openres *o_res = &data->o_res;
  1850. int status;
  1851. status = nfs4_run_open_task(data, 1);
  1852. if (status != 0 || !data->rpc_done)
  1853. return status;
  1854. nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
  1855. if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
  1856. status = _nfs4_proc_open_confirm(data);
  1857. if (status != 0)
  1858. return status;
  1859. }
  1860. return status;
  1861. }
  1862. /*
  1863. * Additional permission checks in order to distinguish between an
  1864. * open for read, and an open for execute. This works around the
  1865. * fact that NFSv4 OPEN treats read and execute permissions as being
  1866. * the same.
  1867. * Note that in the non-execute case, we want to turn off permission
  1868. * checking if we just created a new file (POSIX open() semantics).
  1869. */
  1870. static int nfs4_opendata_access(struct rpc_cred *cred,
  1871. struct nfs4_opendata *opendata,
  1872. struct nfs4_state *state, fmode_t fmode,
  1873. int openflags)
  1874. {
  1875. struct nfs_access_entry cache;
  1876. u32 mask;
  1877. /* access call failed or for some reason the server doesn't
  1878. * support any access modes -- defer access call until later */
  1879. if (opendata->o_res.access_supported == 0)
  1880. return 0;
  1881. mask = 0;
  1882. /*
  1883. * Use openflags to check for exec, because fmode won't
  1884. * always have FMODE_EXEC set when file open for exec.
  1885. */
  1886. if (openflags & __FMODE_EXEC) {
  1887. /* ONLY check for exec rights */
  1888. mask = MAY_EXEC;
  1889. } else if ((fmode & FMODE_READ) && !opendata->file_created)
  1890. mask = MAY_READ;
  1891. cache.cred = cred;
  1892. cache.jiffies = jiffies;
  1893. nfs_access_set_mask(&cache, opendata->o_res.access_result);
  1894. nfs_access_add_cache(state->inode, &cache);
  1895. if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
  1896. return 0;
  1897. /* even though OPEN succeeded, access is denied. Close the file */
  1898. nfs4_close_state(state, fmode);
  1899. return -EACCES;
  1900. }
  1901. /*
  1902. * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
  1903. */
  1904. static int _nfs4_proc_open(struct nfs4_opendata *data)
  1905. {
  1906. struct inode *dir = d_inode(data->dir);
  1907. struct nfs_server *server = NFS_SERVER(dir);
  1908. struct nfs_openargs *o_arg = &data->o_arg;
  1909. struct nfs_openres *o_res = &data->o_res;
  1910. int status;
  1911. status = nfs4_run_open_task(data, 0);
  1912. if (!data->rpc_done)
  1913. return status;
  1914. if (status != 0) {
  1915. if (status == -NFS4ERR_BADNAME &&
  1916. !(o_arg->open_flags & O_CREAT))
  1917. return -ENOENT;
  1918. return status;
  1919. }
  1920. nfs_fattr_map_and_free_names(server, &data->f_attr);
  1921. if (o_arg->open_flags & O_CREAT) {
  1922. update_changeattr(dir, &o_res->cinfo);
  1923. if (o_arg->open_flags & O_EXCL)
  1924. data->file_created = 1;
  1925. else if (o_res->cinfo.before != o_res->cinfo.after)
  1926. data->file_created = 1;
  1927. }
  1928. if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
  1929. server->caps &= ~NFS_CAP_POSIX_LOCK;
  1930. if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
  1931. status = _nfs4_proc_open_confirm(data);
  1932. if (status != 0)
  1933. return status;
  1934. }
  1935. if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
  1936. nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, o_res->f_label);
  1937. return 0;
  1938. }
  1939. static int nfs4_recover_expired_lease(struct nfs_server *server)
  1940. {
  1941. return nfs4_client_recover_expired_lease(server->nfs_client);
  1942. }
  1943. /*
  1944. * OPEN_EXPIRED:
  1945. * reclaim state on the server after a network partition.
  1946. * Assumes caller holds the appropriate lock
  1947. */
  1948. static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
  1949. {
  1950. struct nfs4_opendata *opendata;
  1951. int ret;
  1952. opendata = nfs4_open_recoverdata_alloc(ctx, state,
  1953. NFS4_OPEN_CLAIM_FH);
  1954. if (IS_ERR(opendata))
  1955. return PTR_ERR(opendata);
  1956. ret = nfs4_open_recover(opendata, state);
  1957. if (ret == -ESTALE)
  1958. d_drop(ctx->dentry);
  1959. nfs4_opendata_put(opendata);
  1960. return ret;
  1961. }
  1962. static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
  1963. {
  1964. struct nfs_server *server = NFS_SERVER(state->inode);
  1965. struct nfs4_exception exception = { };
  1966. int err;
  1967. do {
  1968. err = _nfs4_open_expired(ctx, state);
  1969. trace_nfs4_open_expired(ctx, 0, err);
  1970. if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
  1971. continue;
  1972. switch (err) {
  1973. default:
  1974. goto out;
  1975. case -NFS4ERR_GRACE:
  1976. case -NFS4ERR_DELAY:
  1977. nfs4_handle_exception(server, err, &exception);
  1978. err = 0;
  1979. }
  1980. } while (exception.retry);
  1981. out:
  1982. return err;
  1983. }
  1984. static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
  1985. {
  1986. struct nfs_open_context *ctx;
  1987. int ret;
  1988. ctx = nfs4_state_find_open_context(state);
  1989. if (IS_ERR(ctx))
  1990. return -EAGAIN;
  1991. ret = nfs4_do_open_expired(ctx, state);
  1992. put_nfs_open_context(ctx);
  1993. return ret;
  1994. }
  1995. static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state)
  1996. {
  1997. nfs_remove_bad_delegation(state->inode);
  1998. write_seqlock(&state->seqlock);
  1999. nfs4_stateid_copy(&state->stateid, &state->open_stateid);
  2000. write_sequnlock(&state->seqlock);
  2001. clear_bit(NFS_DELEGATED_STATE, &state->flags);
  2002. }
  2003. static void nfs40_clear_delegation_stateid(struct nfs4_state *state)
  2004. {
  2005. if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL)
  2006. nfs_finish_clear_delegation_stateid(state);
  2007. }
  2008. static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
  2009. {
  2010. /* NFSv4.0 doesn't allow for delegation recovery on open expire */
  2011. nfs40_clear_delegation_stateid(state);
  2012. return nfs4_open_expired(sp, state);
  2013. }
  2014. #if defined(CONFIG_NFS_V4_1)
  2015. static void nfs41_check_delegation_stateid(struct nfs4_state *state)
  2016. {
  2017. struct nfs_server *server = NFS_SERVER(state->inode);
  2018. nfs4_stateid stateid;
  2019. struct nfs_delegation *delegation;
  2020. struct rpc_cred *cred;
  2021. int status;
  2022. /* Get the delegation credential for use by test/free_stateid */
  2023. rcu_read_lock();
  2024. delegation = rcu_dereference(NFS_I(state->inode)->delegation);
  2025. if (delegation == NULL) {
  2026. rcu_read_unlock();
  2027. return;
  2028. }
  2029. nfs4_stateid_copy(&stateid, &delegation->stateid);
  2030. cred = get_rpccred(delegation->cred);
  2031. rcu_read_unlock();
  2032. status = nfs41_test_stateid(server, &stateid, cred);
  2033. trace_nfs4_test_delegation_stateid(state, NULL, status);
  2034. if (status != NFS_OK) {
  2035. /* Free the stateid unless the server explicitly
  2036. * informs us the stateid is unrecognized. */
  2037. if (status != -NFS4ERR_BAD_STATEID)
  2038. nfs41_free_stateid(server, &stateid, cred);
  2039. nfs_finish_clear_delegation_stateid(state);
  2040. }
  2041. put_rpccred(cred);
  2042. }
  2043. /**
  2044. * nfs41_check_open_stateid - possibly free an open stateid
  2045. *
  2046. * @state: NFSv4 state for an inode
  2047. *
  2048. * Returns NFS_OK if recovery for this stateid is now finished.
  2049. * Otherwise a negative NFS4ERR value is returned.
  2050. */
  2051. static int nfs41_check_open_stateid(struct nfs4_state *state)
  2052. {
  2053. struct nfs_server *server = NFS_SERVER(state->inode);
  2054. nfs4_stateid *stateid = &state->open_stateid;
  2055. struct rpc_cred *cred = state->owner->so_cred;
  2056. int status;
  2057. /* If a state reset has been done, test_stateid is unneeded */
  2058. if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
  2059. (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
  2060. (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
  2061. return -NFS4ERR_BAD_STATEID;
  2062. status = nfs41_test_stateid(server, stateid, cred);
  2063. trace_nfs4_test_open_stateid(state, NULL, status);
  2064. if (status != NFS_OK) {
  2065. /* Free the stateid unless the server explicitly
  2066. * informs us the stateid is unrecognized. */
  2067. if (status != -NFS4ERR_BAD_STATEID)
  2068. nfs41_free_stateid(server, stateid, cred);
  2069. clear_bit(NFS_O_RDONLY_STATE, &state->flags);
  2070. clear_bit(NFS_O_WRONLY_STATE, &state->flags);
  2071. clear_bit(NFS_O_RDWR_STATE, &state->flags);
  2072. clear_bit(NFS_OPEN_STATE, &state->flags);
  2073. }
  2074. return status;
  2075. }
  2076. static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
  2077. {
  2078. int status;
  2079. nfs41_check_delegation_stateid(state);
  2080. status = nfs41_check_open_stateid(state);
  2081. if (status != NFS_OK)
  2082. status = nfs4_open_expired(sp, state);
  2083. return status;
  2084. }
  2085. #endif
  2086. /*
  2087. * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
  2088. * fields corresponding to attributes that were used to store the verifier.
  2089. * Make sure we clobber those fields in the later setattr call
  2090. */
  2091. static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata,
  2092. struct iattr *sattr, struct nfs4_label **label)
  2093. {
  2094. const u32 *attrset = opendata->o_res.attrset;
  2095. if ((attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
  2096. !(sattr->ia_valid & ATTR_ATIME_SET))
  2097. sattr->ia_valid |= ATTR_ATIME;
  2098. if ((attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
  2099. !(sattr->ia_valid & ATTR_MTIME_SET))
  2100. sattr->ia_valid |= ATTR_MTIME;
  2101. /* Except MODE, it seems harmless of setting twice. */
  2102. if ((attrset[1] & FATTR4_WORD1_MODE))
  2103. sattr->ia_valid &= ~ATTR_MODE;
  2104. if (attrset[2] & FATTR4_WORD2_SECURITY_LABEL)
  2105. *label = NULL;
  2106. }
  2107. static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
  2108. fmode_t fmode,
  2109. int flags,
  2110. struct nfs_open_context *ctx)
  2111. {
  2112. struct nfs4_state_owner *sp = opendata->owner;
  2113. struct nfs_server *server = sp->so_server;
  2114. struct dentry *dentry;
  2115. struct nfs4_state *state;
  2116. unsigned int seq;
  2117. int ret;
  2118. seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
  2119. ret = _nfs4_proc_open(opendata);
  2120. if (ret != 0)
  2121. goto out;
  2122. state = nfs4_opendata_to_nfs4_state(opendata);
  2123. ret = PTR_ERR(state);
  2124. if (IS_ERR(state))
  2125. goto out;
  2126. if (server->caps & NFS_CAP_POSIX_LOCK)
  2127. set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
  2128. dentry = opendata->dentry;
  2129. if (d_really_is_negative(dentry)) {
  2130. /* FIXME: Is this d_drop() ever needed? */
  2131. d_drop(dentry);
  2132. dentry = d_add_unique(dentry, igrab(state->inode));
  2133. if (dentry == NULL) {
  2134. dentry = opendata->dentry;
  2135. } else if (dentry != ctx->dentry) {
  2136. dput(ctx->dentry);
  2137. ctx->dentry = dget(dentry);
  2138. }
  2139. nfs_set_verifier(dentry,
  2140. nfs_save_change_attribute(d_inode(opendata->dir)));
  2141. }
  2142. ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
  2143. if (ret != 0)
  2144. goto out;
  2145. ctx->state = state;
  2146. if (d_inode(dentry) == state->inode) {
  2147. nfs_inode_attach_open_context(ctx);
  2148. if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
  2149. nfs4_schedule_stateid_recovery(server, state);
  2150. }
  2151. out:
  2152. return ret;
  2153. }
  2154. /*
  2155. * Returns a referenced nfs4_state
  2156. */
  2157. static int _nfs4_do_open(struct inode *dir,
  2158. struct nfs_open_context *ctx,
  2159. int flags,
  2160. struct iattr *sattr,
  2161. struct nfs4_label *label,
  2162. int *opened)
  2163. {
  2164. struct nfs4_state_owner *sp;
  2165. struct nfs4_state *state = NULL;
  2166. struct nfs_server *server = NFS_SERVER(dir);
  2167. struct nfs4_opendata *opendata;
  2168. struct dentry *dentry = ctx->dentry;
  2169. struct rpc_cred *cred = ctx->cred;
  2170. struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
  2171. fmode_t fmode = ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
  2172. enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
  2173. struct nfs4_label *olabel = NULL;
  2174. int status;
  2175. /* Protect against reboot recovery conflicts */
  2176. status = -ENOMEM;
  2177. sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
  2178. if (sp == NULL) {
  2179. dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
  2180. goto out_err;
  2181. }
  2182. status = nfs4_recover_expired_lease(server);
  2183. if (status != 0)
  2184. goto err_put_state_owner;
  2185. if (d_really_is_positive(dentry))
  2186. nfs4_return_incompatible_delegation(d_inode(dentry), fmode);
  2187. status = -ENOMEM;
  2188. if (d_really_is_positive(dentry))
  2189. claim = NFS4_OPEN_CLAIM_FH;
  2190. opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr,
  2191. label, claim, GFP_KERNEL);
  2192. if (opendata == NULL)
  2193. goto err_put_state_owner;
  2194. if (label) {
  2195. olabel = nfs4_label_alloc(server, GFP_KERNEL);
  2196. if (IS_ERR(olabel)) {
  2197. status = PTR_ERR(olabel);
  2198. goto err_opendata_put;
  2199. }
  2200. }
  2201. if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
  2202. if (!opendata->f_attr.mdsthreshold) {
  2203. opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
  2204. if (!opendata->f_attr.mdsthreshold)
  2205. goto err_free_label;
  2206. }
  2207. opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
  2208. }
  2209. if (d_really_is_positive(dentry))
  2210. opendata->state = nfs4_get_open_state(d_inode(dentry), sp);
  2211. status = _nfs4_open_and_get_state(opendata, fmode, flags, ctx);
  2212. if (status != 0)
  2213. goto err_free_label;
  2214. state = ctx->state;
  2215. if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) &&
  2216. (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
  2217. nfs4_exclusive_attrset(opendata, sattr, &label);
  2218. nfs_fattr_init(opendata->o_res.f_attr);
  2219. status = nfs4_do_setattr(state->inode, cred,
  2220. opendata->o_res.f_attr, sattr,
  2221. state, label, olabel);
  2222. if (status == 0) {
  2223. nfs_setattr_update_inode(state->inode, sattr,
  2224. opendata->o_res.f_attr);
  2225. nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel);
  2226. }
  2227. }
  2228. if (opened && opendata->file_created)
  2229. *opened |= FILE_CREATED;
  2230. if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) {
  2231. *ctx_th = opendata->f_attr.mdsthreshold;
  2232. opendata->f_attr.mdsthreshold = NULL;
  2233. }
  2234. nfs4_label_free(olabel);
  2235. nfs4_opendata_put(opendata);
  2236. nfs4_put_state_owner(sp);
  2237. return 0;
  2238. err_free_label:
  2239. nfs4_label_free(olabel);
  2240. err_opendata_put:
  2241. nfs4_opendata_put(opendata);
  2242. err_put_state_owner:
  2243. nfs4_put_state_owner(sp);
  2244. out_err:
  2245. return status;
  2246. }
  2247. static struct nfs4_state *nfs4_do_open(struct inode *dir,
  2248. struct nfs_open_context *ctx,
  2249. int flags,
  2250. struct iattr *sattr,
  2251. struct nfs4_label *label,
  2252. int *opened)
  2253. {
  2254. struct nfs_server *server = NFS_SERVER(dir);
  2255. struct nfs4_exception exception = { };
  2256. struct nfs4_state *res;
  2257. int status;
  2258. do {
  2259. status = _nfs4_do_open(dir, ctx, flags, sattr, label, opened);
  2260. res = ctx->state;
  2261. trace_nfs4_open_file(ctx, flags, status);
  2262. if (status == 0)
  2263. break;
  2264. /* NOTE: BAD_SEQID means the server and client disagree about the
  2265. * book-keeping w.r.t. state-changing operations
  2266. * (OPEN/CLOSE/LOCK/LOCKU...)
  2267. * It is actually a sign of a bug on the client or on the server.
  2268. *
  2269. * If we receive a BAD_SEQID error in the particular case of
  2270. * doing an OPEN, we assume that nfs_increment_open_seqid() will
  2271. * have unhashed the old state_owner for us, and that we can
  2272. * therefore safely retry using a new one. We should still warn
  2273. * the user though...
  2274. */
  2275. if (status == -NFS4ERR_BAD_SEQID) {
  2276. pr_warn_ratelimited("NFS: v4 server %s "
  2277. " returned a bad sequence-id error!\n",
  2278. NFS_SERVER(dir)->nfs_client->cl_hostname);
  2279. exception.retry = 1;
  2280. continue;
  2281. }
  2282. /*
  2283. * BAD_STATEID on OPEN means that the server cancelled our
  2284. * state before it received the OPEN_CONFIRM.
  2285. * Recover by retrying the request as per the discussion
  2286. * on Page 181 of RFC3530.
  2287. */
  2288. if (status == -NFS4ERR_BAD_STATEID) {
  2289. exception.retry = 1;
  2290. continue;
  2291. }
  2292. if (status == -EAGAIN) {
  2293. /* We must have found a delegation */
  2294. exception.retry = 1;
  2295. continue;
  2296. }
  2297. if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
  2298. continue;
  2299. res = ERR_PTR(nfs4_handle_exception(server,
  2300. status, &exception));
  2301. } while (exception.retry);
  2302. return res;
  2303. }
  2304. static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  2305. struct nfs_fattr *fattr, struct iattr *sattr,
  2306. struct nfs4_state *state, struct nfs4_label *ilabel,
  2307. struct nfs4_label *olabel)
  2308. {
  2309. struct nfs_server *server = NFS_SERVER(inode);
  2310. struct nfs_setattrargs arg = {
  2311. .fh = NFS_FH(inode),
  2312. .iap = sattr,
  2313. .server = server,
  2314. .bitmask = server->attr_bitmask,
  2315. .label = ilabel,
  2316. };
  2317. struct nfs_setattrres res = {
  2318. .fattr = fattr,
  2319. .label = olabel,
  2320. .server = server,
  2321. };
  2322. struct rpc_message msg = {
  2323. .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
  2324. .rpc_argp = &arg,
  2325. .rpc_resp = &res,
  2326. .rpc_cred = cred,
  2327. };
  2328. unsigned long timestamp = jiffies;
  2329. fmode_t fmode;
  2330. bool truncate;
  2331. int status;
  2332. arg.bitmask = nfs4_bitmask(server, ilabel);
  2333. if (ilabel)
  2334. arg.bitmask = nfs4_bitmask(server, olabel);
  2335. nfs_fattr_init(fattr);
  2336. /* Servers should only apply open mode checks for file size changes */
  2337. truncate = (sattr->ia_valid & ATTR_SIZE) ? true : false;
  2338. fmode = truncate ? FMODE_WRITE : FMODE_READ;
  2339. if (nfs4_copy_delegation_stateid(&arg.stateid, inode, fmode)) {
  2340. /* Use that stateid */
  2341. } else if (truncate && state != NULL) {
  2342. struct nfs_lockowner lockowner = {
  2343. .l_owner = current->files,
  2344. .l_pid = current->tgid,
  2345. };
  2346. if (!nfs4_valid_open_stateid(state))
  2347. return -EBADF;
  2348. if (nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
  2349. &lockowner) == -EIO)
  2350. return -EBADF;
  2351. } else
  2352. nfs4_stateid_copy(&arg.stateid, &zero_stateid);
  2353. status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
  2354. if (status == 0 && state != NULL)
  2355. renew_lease(server, timestamp);
  2356. return status;
  2357. }
  2358. static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  2359. struct nfs_fattr *fattr, struct iattr *sattr,
  2360. struct nfs4_state *state, struct nfs4_label *ilabel,
  2361. struct nfs4_label *olabel)
  2362. {
  2363. struct nfs_server *server = NFS_SERVER(inode);
  2364. struct nfs4_exception exception = {
  2365. .state = state,
  2366. .inode = inode,
  2367. };
  2368. int err;
  2369. do {
  2370. err = _nfs4_do_setattr(inode, cred, fattr, sattr, state, ilabel, olabel);
  2371. trace_nfs4_setattr(inode, err);
  2372. switch (err) {
  2373. case -NFS4ERR_OPENMODE:
  2374. if (!(sattr->ia_valid & ATTR_SIZE)) {
  2375. pr_warn_once("NFSv4: server %s is incorrectly "
  2376. "applying open mode checks to "
  2377. "a SETATTR that is not "
  2378. "changing file size.\n",
  2379. server->nfs_client->cl_hostname);
  2380. }
  2381. if (state && !(state->state & FMODE_WRITE)) {
  2382. err = -EBADF;
  2383. if (sattr->ia_valid & ATTR_OPEN)
  2384. err = -EACCES;
  2385. goto out;
  2386. }
  2387. }
  2388. err = nfs4_handle_exception(server, err, &exception);
  2389. } while (exception.retry);
  2390. out:
  2391. return err;
  2392. }
  2393. static bool
  2394. nfs4_wait_on_layoutreturn(struct inode *inode, struct rpc_task *task)
  2395. {
  2396. if (inode == NULL || !nfs_have_layout(inode))
  2397. return false;
  2398. return pnfs_wait_on_layoutreturn(inode, task);
  2399. }
  2400. struct nfs4_closedata {
  2401. struct inode *inode;
  2402. struct nfs4_state *state;
  2403. struct nfs_closeargs arg;
  2404. struct nfs_closeres res;
  2405. struct nfs_fattr fattr;
  2406. unsigned long timestamp;
  2407. bool roc;
  2408. u32 roc_barrier;
  2409. };
  2410. static void nfs4_free_closedata(void *data)
  2411. {
  2412. struct nfs4_closedata *calldata = data;
  2413. struct nfs4_state_owner *sp = calldata->state->owner;
  2414. struct super_block *sb = calldata->state->inode->i_sb;
  2415. if (calldata->roc)
  2416. pnfs_roc_release(calldata->state->inode);
  2417. nfs4_put_open_state(calldata->state);
  2418. nfs_free_seqid(calldata->arg.seqid);
  2419. nfs4_put_state_owner(sp);
  2420. nfs_sb_deactive(sb);
  2421. kfree(calldata);
  2422. }
  2423. static void nfs4_close_done(struct rpc_task *task, void *data)
  2424. {
  2425. struct nfs4_closedata *calldata = data;
  2426. struct nfs4_state *state = calldata->state;
  2427. struct nfs_server *server = NFS_SERVER(calldata->inode);
  2428. nfs4_stateid *res_stateid = NULL;
  2429. dprintk("%s: begin!\n", __func__);
  2430. if (!nfs4_sequence_done(task, &calldata->res.seq_res))
  2431. return;
  2432. trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
  2433. /* hmm. we are done with the inode, and in the process of freeing
  2434. * the state_owner. we keep this around to process errors
  2435. */
  2436. switch (task->tk_status) {
  2437. case 0:
  2438. res_stateid = &calldata->res.stateid;
  2439. if (calldata->roc)
  2440. pnfs_roc_set_barrier(state->inode,
  2441. calldata->roc_barrier);
  2442. renew_lease(server, calldata->timestamp);
  2443. break;
  2444. case -NFS4ERR_ADMIN_REVOKED:
  2445. case -NFS4ERR_STALE_STATEID:
  2446. case -NFS4ERR_OLD_STATEID:
  2447. case -NFS4ERR_BAD_STATEID:
  2448. case -NFS4ERR_EXPIRED:
  2449. if (!nfs4_stateid_match(&calldata->arg.stateid,
  2450. &state->open_stateid)) {
  2451. rpc_restart_call_prepare(task);
  2452. goto out_release;
  2453. }
  2454. if (calldata->arg.fmode == 0)
  2455. break;
  2456. default:
  2457. if (nfs4_async_handle_error(task, server, state, NULL) == -EAGAIN) {
  2458. rpc_restart_call_prepare(task);
  2459. goto out_release;
  2460. }
  2461. }
  2462. nfs_clear_open_stateid(state, &calldata->arg.stateid,
  2463. res_stateid, calldata->arg.fmode);
  2464. out_release:
  2465. nfs_release_seqid(calldata->arg.seqid);
  2466. nfs_refresh_inode(calldata->inode, calldata->res.fattr);
  2467. dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
  2468. }
  2469. static void nfs4_close_prepare(struct rpc_task *task, void *data)
  2470. {
  2471. struct nfs4_closedata *calldata = data;
  2472. struct nfs4_state *state = calldata->state;
  2473. struct inode *inode = calldata->inode;
  2474. bool is_rdonly, is_wronly, is_rdwr;
  2475. int call_close = 0;
  2476. dprintk("%s: begin!\n", __func__);
  2477. if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
  2478. goto out_wait;
  2479. task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
  2480. spin_lock(&state->owner->so_lock);
  2481. is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags);
  2482. is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags);
  2483. is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags);
  2484. nfs4_stateid_copy(&calldata->arg.stateid, &state->open_stateid);
  2485. /* Calculate the change in open mode */
  2486. calldata->arg.fmode = 0;
  2487. if (state->n_rdwr == 0) {
  2488. if (state->n_rdonly == 0)
  2489. call_close |= is_rdonly;
  2490. else if (is_rdonly)
  2491. calldata->arg.fmode |= FMODE_READ;
  2492. if (state->n_wronly == 0)
  2493. call_close |= is_wronly;
  2494. else if (is_wronly)
  2495. calldata->arg.fmode |= FMODE_WRITE;
  2496. } else if (is_rdwr)
  2497. calldata->arg.fmode |= FMODE_READ|FMODE_WRITE;
  2498. if (calldata->arg.fmode == 0)
  2499. call_close |= is_rdwr;
  2500. if (!nfs4_valid_open_stateid(state))
  2501. call_close = 0;
  2502. spin_unlock(&state->owner->so_lock);
  2503. if (!call_close) {
  2504. /* Note: exit _without_ calling nfs4_close_done */
  2505. goto out_no_action;
  2506. }
  2507. if (nfs4_wait_on_layoutreturn(inode, task)) {
  2508. nfs_release_seqid(calldata->arg.seqid);
  2509. goto out_wait;
  2510. }
  2511. if (calldata->arg.fmode == 0)
  2512. task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
  2513. if (calldata->roc)
  2514. pnfs_roc_get_barrier(inode, &calldata->roc_barrier);
  2515. calldata->arg.share_access =
  2516. nfs4_map_atomic_open_share(NFS_SERVER(inode),
  2517. calldata->arg.fmode, 0);
  2518. nfs_fattr_init(calldata->res.fattr);
  2519. calldata->timestamp = jiffies;
  2520. if (nfs4_setup_sequence(NFS_SERVER(inode),
  2521. &calldata->arg.seq_args,
  2522. &calldata->res.seq_res,
  2523. task) != 0)
  2524. nfs_release_seqid(calldata->arg.seqid);
  2525. dprintk("%s: done!\n", __func__);
  2526. return;
  2527. out_no_action:
  2528. task->tk_action = NULL;
  2529. out_wait:
  2530. nfs4_sequence_done(task, &calldata->res.seq_res);
  2531. }
  2532. static const struct rpc_call_ops nfs4_close_ops = {
  2533. .rpc_call_prepare = nfs4_close_prepare,
  2534. .rpc_call_done = nfs4_close_done,
  2535. .rpc_release = nfs4_free_closedata,
  2536. };
  2537. static bool nfs4_roc(struct inode *inode)
  2538. {
  2539. if (!nfs_have_layout(inode))
  2540. return false;
  2541. return pnfs_roc(inode);
  2542. }
  2543. /*
  2544. * It is possible for data to be read/written from a mem-mapped file
  2545. * after the sys_close call (which hits the vfs layer as a flush).
  2546. * This means that we can't safely call nfsv4 close on a file until
  2547. * the inode is cleared. This in turn means that we are not good
  2548. * NFSv4 citizens - we do not indicate to the server to update the file's
  2549. * share state even when we are done with one of the three share
  2550. * stateid's in the inode.
  2551. *
  2552. * NOTE: Caller must be holding the sp->so_owner semaphore!
  2553. */
  2554. int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
  2555. {
  2556. struct nfs_server *server = NFS_SERVER(state->inode);
  2557. struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
  2558. struct nfs4_closedata *calldata;
  2559. struct nfs4_state_owner *sp = state->owner;
  2560. struct rpc_task *task;
  2561. struct rpc_message msg = {
  2562. .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
  2563. .rpc_cred = state->owner->so_cred,
  2564. };
  2565. struct rpc_task_setup task_setup_data = {
  2566. .rpc_client = server->client,
  2567. .rpc_message = &msg,
  2568. .callback_ops = &nfs4_close_ops,
  2569. .workqueue = nfsiod_workqueue,
  2570. .flags = RPC_TASK_ASYNC,
  2571. };
  2572. int status = -ENOMEM;
  2573. nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
  2574. &task_setup_data.rpc_client, &msg);
  2575. calldata = kzalloc(sizeof(*calldata), gfp_mask);
  2576. if (calldata == NULL)
  2577. goto out;
  2578. nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
  2579. calldata->inode = state->inode;
  2580. calldata->state = state;
  2581. calldata->arg.fh = NFS_FH(state->inode);
  2582. /* Serialization for the sequence id */
  2583. alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
  2584. calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask);
  2585. if (IS_ERR(calldata->arg.seqid))
  2586. goto out_free_calldata;
  2587. calldata->arg.fmode = 0;
  2588. calldata->arg.bitmask = server->cache_consistency_bitmask;
  2589. calldata->res.fattr = &calldata->fattr;
  2590. calldata->res.seqid = calldata->arg.seqid;
  2591. calldata->res.server = server;
  2592. calldata->roc = nfs4_roc(state->inode);
  2593. nfs_sb_active(calldata->inode->i_sb);
  2594. msg.rpc_argp = &calldata->arg;
  2595. msg.rpc_resp = &calldata->res;
  2596. task_setup_data.callback_data = calldata;
  2597. task = rpc_run_task(&task_setup_data);
  2598. if (IS_ERR(task))
  2599. return PTR_ERR(task);
  2600. status = 0;
  2601. if (wait)
  2602. status = rpc_wait_for_completion_task(task);
  2603. rpc_put_task(task);
  2604. return status;
  2605. out_free_calldata:
  2606. kfree(calldata);
  2607. out:
  2608. nfs4_put_open_state(state);
  2609. nfs4_put_state_owner(sp);
  2610. return status;
  2611. }
  2612. static struct inode *
  2613. nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
  2614. int open_flags, struct iattr *attr, int *opened)
  2615. {
  2616. struct nfs4_state *state;
  2617. struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL;
  2618. label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
  2619. /* Protect against concurrent sillydeletes */
  2620. state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
  2621. nfs4_label_release_security(label);
  2622. if (IS_ERR(state))
  2623. return ERR_CAST(state);
  2624. return state->inode;
  2625. }
  2626. static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
  2627. {
  2628. if (ctx->state == NULL)
  2629. return;
  2630. if (is_sync)
  2631. nfs4_close_sync(ctx->state, ctx->mode);
  2632. else
  2633. nfs4_close_state(ctx->state, ctx->mode);
  2634. }
  2635. #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
  2636. #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
  2637. #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_SECURITY_LABEL - 1UL)
  2638. static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
  2639. {
  2640. u32 bitmask[3] = {}, minorversion = server->nfs_client->cl_minorversion;
  2641. struct nfs4_server_caps_arg args = {
  2642. .fhandle = fhandle,
  2643. .bitmask = bitmask,
  2644. };
  2645. struct nfs4_server_caps_res res = {};
  2646. struct rpc_message msg = {
  2647. .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
  2648. .rpc_argp = &args,
  2649. .rpc_resp = &res,
  2650. };
  2651. int status;
  2652. bitmask[0] = FATTR4_WORD0_SUPPORTED_ATTRS |
  2653. FATTR4_WORD0_FH_EXPIRE_TYPE |
  2654. FATTR4_WORD0_LINK_SUPPORT |
  2655. FATTR4_WORD0_SYMLINK_SUPPORT |
  2656. FATTR4_WORD0_ACLSUPPORT;
  2657. if (minorversion)
  2658. bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT;
  2659. status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
  2660. if (status == 0) {
  2661. /* Sanity check the server answers */
  2662. switch (minorversion) {
  2663. case 0:
  2664. res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
  2665. res.attr_bitmask[2] = 0;
  2666. break;
  2667. case 1:
  2668. res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
  2669. break;
  2670. case 2:
  2671. res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
  2672. }
  2673. memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
  2674. server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
  2675. NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
  2676. NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
  2677. NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
  2678. NFS_CAP_CTIME|NFS_CAP_MTIME|
  2679. NFS_CAP_SECURITY_LABEL);
  2680. if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
  2681. res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
  2682. server->caps |= NFS_CAP_ACLS;
  2683. if (res.has_links != 0)
  2684. server->caps |= NFS_CAP_HARDLINKS;
  2685. if (res.has_symlinks != 0)
  2686. server->caps |= NFS_CAP_SYMLINKS;
  2687. if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
  2688. server->caps |= NFS_CAP_FILEID;
  2689. if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
  2690. server->caps |= NFS_CAP_MODE;
  2691. if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
  2692. server->caps |= NFS_CAP_NLINK;
  2693. if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
  2694. server->caps |= NFS_CAP_OWNER;
  2695. if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
  2696. server->caps |= NFS_CAP_OWNER_GROUP;
  2697. if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
  2698. server->caps |= NFS_CAP_ATIME;
  2699. if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
  2700. server->caps |= NFS_CAP_CTIME;
  2701. if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
  2702. server->caps |= NFS_CAP_MTIME;
  2703. #ifdef CONFIG_NFS_V4_SECURITY_LABEL
  2704. if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
  2705. server->caps |= NFS_CAP_SECURITY_LABEL;
  2706. #endif
  2707. memcpy(server->attr_bitmask_nl, res.attr_bitmask,
  2708. sizeof(server->attr_bitmask));
  2709. server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
  2710. memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
  2711. server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
  2712. server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
  2713. server->cache_consistency_bitmask[2] = 0;
  2714. memcpy(server->exclcreat_bitmask, res.exclcreat_bitmask,
  2715. sizeof(server->exclcreat_bitmask));
  2716. server->acl_bitmask = res.acl_bitmask;
  2717. server->fh_expire_type = res.fh_expire_type;
  2718. }
  2719. return status;
  2720. }
  2721. int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
  2722. {
  2723. struct nfs4_exception exception = { };
  2724. int err;
  2725. do {
  2726. err = nfs4_handle_exception(server,
  2727. _nfs4_server_capabilities(server, fhandle),
  2728. &exception);
  2729. } while (exception.retry);
  2730. return err;
  2731. }
  2732. static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
  2733. struct nfs_fsinfo *info)
  2734. {
  2735. u32 bitmask[3];
  2736. struct nfs4_lookup_root_arg args = {
  2737. .bitmask = bitmask,
  2738. };
  2739. struct nfs4_lookup_res res = {
  2740. .server = server,
  2741. .fattr = info->fattr,
  2742. .fh = fhandle,
  2743. };
  2744. struct rpc_message msg = {
  2745. .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
  2746. .rpc_argp = &args,
  2747. .rpc_resp = &res,
  2748. };
  2749. bitmask[0] = nfs4_fattr_bitmap[0];
  2750. bitmask[1] = nfs4_fattr_bitmap[1];
  2751. /*
  2752. * Process the label in the upcoming getfattr
  2753. */
  2754. bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
  2755. nfs_fattr_init(info->fattr);
  2756. return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
  2757. }
  2758. static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
  2759. struct nfs_fsinfo *info)
  2760. {
  2761. struct nfs4_exception exception = { };
  2762. int err;
  2763. do {
  2764. err = _nfs4_lookup_root(server, fhandle, info);
  2765. trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
  2766. switch (err) {
  2767. case 0:
  2768. case -NFS4ERR_WRONGSEC:
  2769. goto out;
  2770. default:
  2771. err = nfs4_handle_exception(server, err, &exception);
  2772. }
  2773. } while (exception.retry);
  2774. out:
  2775. return err;
  2776. }
  2777. static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
  2778. struct nfs_fsinfo *info, rpc_authflavor_t flavor)
  2779. {
  2780. struct rpc_auth_create_args auth_args = {
  2781. .pseudoflavor = flavor,
  2782. };
  2783. struct rpc_auth *auth;
  2784. int ret;
  2785. auth = rpcauth_create(&auth_args, server->client);
  2786. if (IS_ERR(auth)) {
  2787. ret = -EACCES;
  2788. goto out;
  2789. }
  2790. ret = nfs4_lookup_root(server, fhandle, info);
  2791. out:
  2792. return ret;
  2793. }
  2794. /*
  2795. * Retry pseudoroot lookup with various security flavors. We do this when:
  2796. *
  2797. * NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
  2798. * NFSv4.1: the server does not support the SECINFO_NO_NAME operation
  2799. *
  2800. * Returns zero on success, or a negative NFS4ERR value, or a
  2801. * negative errno value.
  2802. */
  2803. static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
  2804. struct nfs_fsinfo *info)
  2805. {
  2806. /* Per 3530bis 15.33.5 */
  2807. static const rpc_authflavor_t flav_array[] = {
  2808. RPC_AUTH_GSS_KRB5P,
  2809. RPC_AUTH_GSS_KRB5I,
  2810. RPC_AUTH_GSS_KRB5,
  2811. RPC_AUTH_UNIX, /* courtesy */
  2812. RPC_AUTH_NULL,
  2813. };
  2814. int status = -EPERM;
  2815. size_t i;
  2816. if (server->auth_info.flavor_len > 0) {
  2817. /* try each flavor specified by user */
  2818. for (i = 0; i < server->auth_info.flavor_len; i++) {
  2819. status = nfs4_lookup_root_sec(server, fhandle, info,
  2820. server->auth_info.flavors[i]);
  2821. if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
  2822. continue;
  2823. break;
  2824. }
  2825. } else {
  2826. /* no flavors specified by user, try default list */
  2827. for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
  2828. status = nfs4_lookup_root_sec(server, fhandle, info,
  2829. flav_array[i]);
  2830. if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
  2831. continue;
  2832. break;
  2833. }
  2834. }
  2835. /*
  2836. * -EACCESS could mean that the user doesn't have correct permissions
  2837. * to access the mount. It could also mean that we tried to mount
  2838. * with a gss auth flavor, but rpc.gssd isn't running. Either way,
  2839. * existing mount programs don't handle -EACCES very well so it should
  2840. * be mapped to -EPERM instead.
  2841. */
  2842. if (status == -EACCES)
  2843. status = -EPERM;
  2844. return status;
  2845. }
  2846. static int nfs4_do_find_root_sec(struct nfs_server *server,
  2847. struct nfs_fh *fhandle, struct nfs_fsinfo *info)
  2848. {
  2849. int mv = server->nfs_client->cl_minorversion;
  2850. return nfs_v4_minor_ops[mv]->find_root_sec(server, fhandle, info);
  2851. }
  2852. /**
  2853. * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
  2854. * @server: initialized nfs_server handle
  2855. * @fhandle: we fill in the pseudo-fs root file handle
  2856. * @info: we fill in an FSINFO struct
  2857. * @auth_probe: probe the auth flavours
  2858. *
  2859. * Returns zero on success, or a negative errno.
  2860. */
  2861. int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
  2862. struct nfs_fsinfo *info,
  2863. bool auth_probe)
  2864. {
  2865. int status = 0;
  2866. if (!auth_probe)
  2867. status = nfs4_lookup_root(server, fhandle, info);
  2868. if (auth_probe || status == NFS4ERR_WRONGSEC)
  2869. status = nfs4_do_find_root_sec(server, fhandle, info);
  2870. if (status == 0)
  2871. status = nfs4_server_capabilities(server, fhandle);
  2872. if (status == 0)
  2873. status = nfs4_do_fsinfo(server, fhandle, info);
  2874. return nfs4_map_errors(status);
  2875. }
  2876. static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
  2877. struct nfs_fsinfo *info)
  2878. {
  2879. int error;
  2880. struct nfs_fattr *fattr = info->fattr;
  2881. struct nfs4_label *label = NULL;
  2882. error = nfs4_server_capabilities(server, mntfh);
  2883. if (error < 0) {
  2884. dprintk("nfs4_get_root: getcaps error = %d\n", -error);
  2885. return error;
  2886. }
  2887. label = nfs4_label_alloc(server, GFP_KERNEL);
  2888. if (IS_ERR(label))
  2889. return PTR_ERR(label);
  2890. error = nfs4_proc_getattr(server, mntfh, fattr, label);
  2891. if (error < 0) {
  2892. dprintk("nfs4_get_root: getattr error = %d\n", -error);
  2893. goto err_free_label;
  2894. }
  2895. if (fattr->valid & NFS_ATTR_FATTR_FSID &&
  2896. !nfs_fsid_equal(&server->fsid, &fattr->fsid))
  2897. memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
  2898. err_free_label:
  2899. nfs4_label_free(label);
  2900. return error;
  2901. }
  2902. /*
  2903. * Get locations and (maybe) other attributes of a referral.
  2904. * Note that we'll actually follow the referral later when
  2905. * we detect fsid mismatch in inode revalidation
  2906. */
  2907. static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
  2908. const struct qstr *name, struct nfs_fattr *fattr,
  2909. struct nfs_fh *fhandle)
  2910. {
  2911. int status = -ENOMEM;
  2912. struct page *page = NULL;
  2913. struct nfs4_fs_locations *locations = NULL;
  2914. page = alloc_page(GFP_KERNEL);
  2915. if (page == NULL)
  2916. goto out;
  2917. locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
  2918. if (locations == NULL)
  2919. goto out;
  2920. status = nfs4_proc_fs_locations(client, dir, name, locations, page);
  2921. if (status != 0)
  2922. goto out;
  2923. /*
  2924. * If the fsid didn't change, this is a migration event, not a
  2925. * referral. Cause us to drop into the exception handler, which
  2926. * will kick off migration recovery.
  2927. */
  2928. if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
  2929. dprintk("%s: server did not return a different fsid for"
  2930. " a referral at %s\n", __func__, name->name);
  2931. status = -NFS4ERR_MOVED;
  2932. goto out;
  2933. }
  2934. /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
  2935. nfs_fixup_referral_attributes(&locations->fattr);
  2936. /* replace the lookup nfs_fattr with the locations nfs_fattr */
  2937. memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
  2938. memset(fhandle, 0, sizeof(struct nfs_fh));
  2939. out:
  2940. if (page)
  2941. __free_page(page);
  2942. kfree(locations);
  2943. return status;
  2944. }
  2945. static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
  2946. struct nfs_fattr *fattr, struct nfs4_label *label)
  2947. {
  2948. struct nfs4_getattr_arg args = {
  2949. .fh = fhandle,
  2950. .bitmask = server->attr_bitmask,
  2951. };
  2952. struct nfs4_getattr_res res = {
  2953. .fattr = fattr,
  2954. .label = label,
  2955. .server = server,
  2956. };
  2957. struct rpc_message msg = {
  2958. .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
  2959. .rpc_argp = &args,
  2960. .rpc_resp = &res,
  2961. };
  2962. args.bitmask = nfs4_bitmask(server, label);
  2963. nfs_fattr_init(fattr);
  2964. return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
  2965. }
  2966. static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
  2967. struct nfs_fattr *fattr, struct nfs4_label *label)
  2968. {
  2969. struct nfs4_exception exception = { };
  2970. int err;
  2971. do {
  2972. err = _nfs4_proc_getattr(server, fhandle, fattr, label);
  2973. trace_nfs4_getattr(server, fhandle, fattr, err);
  2974. err = nfs4_handle_exception(server, err,
  2975. &exception);
  2976. } while (exception.retry);
  2977. return err;
  2978. }
  2979. /*
  2980. * The file is not closed if it is opened due to the a request to change
  2981. * the size of the file. The open call will not be needed once the
  2982. * VFS layer lookup-intents are implemented.
  2983. *
  2984. * Close is called when the inode is destroyed.
  2985. * If we haven't opened the file for O_WRONLY, we
  2986. * need to in the size_change case to obtain a stateid.
  2987. *
  2988. * Got race?
  2989. * Because OPEN is always done by name in nfsv4, it is
  2990. * possible that we opened a different file by the same
  2991. * name. We can recognize this race condition, but we
  2992. * can't do anything about it besides returning an error.
  2993. *
  2994. * This will be fixed with VFS changes (lookup-intent).
  2995. */
  2996. static int
  2997. nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
  2998. struct iattr *sattr)
  2999. {
  3000. struct inode *inode = d_inode(dentry);
  3001. struct rpc_cred *cred = NULL;
  3002. struct nfs4_state *state = NULL;
  3003. struct nfs4_label *label = NULL;
  3004. int status;
  3005. if (pnfs_ld_layoutret_on_setattr(inode) &&
  3006. sattr->ia_valid & ATTR_SIZE &&
  3007. sattr->ia_size < i_size_read(inode))
  3008. pnfs_commit_and_return_layout(inode);
  3009. nfs_fattr_init(fattr);
  3010. /* Deal with open(O_TRUNC) */
  3011. if (sattr->ia_valid & ATTR_OPEN)
  3012. sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
  3013. /* Optimization: if the end result is no change, don't RPC */
  3014. if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
  3015. return 0;
  3016. /* Search for an existing open(O_WRITE) file */
  3017. if (sattr->ia_valid & ATTR_FILE) {
  3018. struct nfs_open_context *ctx;
  3019. ctx = nfs_file_open_context(sattr->ia_file);
  3020. if (ctx) {
  3021. cred = ctx->cred;
  3022. state = ctx->state;
  3023. }
  3024. }
  3025. label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
  3026. if (IS_ERR(label))
  3027. return PTR_ERR(label);
  3028. status = nfs4_do_setattr(inode, cred, fattr, sattr, state, NULL, label);
  3029. if (status == 0) {
  3030. nfs_setattr_update_inode(inode, sattr, fattr);
  3031. nfs_setsecurity(inode, fattr, label);
  3032. }
  3033. nfs4_label_free(label);
  3034. return status;
  3035. }
  3036. static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
  3037. const struct qstr *name, struct nfs_fh *fhandle,
  3038. struct nfs_fattr *fattr, struct nfs4_label *label)
  3039. {
  3040. struct nfs_server *server = NFS_SERVER(dir);
  3041. int status;
  3042. struct nfs4_lookup_arg args = {
  3043. .bitmask = server->attr_bitmask,
  3044. .dir_fh = NFS_FH(dir),
  3045. .name = name,
  3046. };
  3047. struct nfs4_lookup_res res = {
  3048. .server = server,
  3049. .fattr = fattr,
  3050. .label = label,
  3051. .fh = fhandle,
  3052. };
  3053. struct rpc_message msg = {
  3054. .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
  3055. .rpc_argp = &args,
  3056. .rpc_resp = &res,
  3057. };
  3058. args.bitmask = nfs4_bitmask(server, label);
  3059. nfs_fattr_init(fattr);
  3060. dprintk("NFS call lookup %s\n", name->name);
  3061. status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
  3062. dprintk("NFS reply lookup: %d\n", status);
  3063. return status;
  3064. }
  3065. static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
  3066. {
  3067. fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
  3068. NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
  3069. fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
  3070. fattr->nlink = 2;
  3071. }
  3072. static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
  3073. struct qstr *name, struct nfs_fh *fhandle,
  3074. struct nfs_fattr *fattr, struct nfs4_label *label)
  3075. {
  3076. struct nfs4_exception exception = { };
  3077. struct rpc_clnt *client = *clnt;
  3078. int err;
  3079. do {
  3080. err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr, label);
  3081. trace_nfs4_lookup(dir, name, err);
  3082. switch (err) {
  3083. case -NFS4ERR_BADNAME:
  3084. err = -ENOENT;
  3085. goto out;
  3086. case -NFS4ERR_MOVED:
  3087. err = nfs4_get_referral(client, dir, name, fattr, fhandle);
  3088. if (err == -NFS4ERR_MOVED)
  3089. err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
  3090. goto out;
  3091. case -NFS4ERR_WRONGSEC:
  3092. err = -EPERM;
  3093. if (client != *clnt)
  3094. goto out;
  3095. client = nfs4_negotiate_security(client, dir, name);
  3096. if (IS_ERR(client))
  3097. return PTR_ERR(client);
  3098. exception.retry = 1;
  3099. break;
  3100. default:
  3101. err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
  3102. }
  3103. } while (exception.retry);
  3104. out:
  3105. if (err == 0)
  3106. *clnt = client;
  3107. else if (client != *clnt)
  3108. rpc_shutdown_client(client);
  3109. return err;
  3110. }
  3111. static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
  3112. struct nfs_fh *fhandle, struct nfs_fattr *fattr,
  3113. struct nfs4_label *label)
  3114. {
  3115. int status;
  3116. struct rpc_clnt *client = NFS_CLIENT(dir);
  3117. status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, label);
  3118. if (client != NFS_CLIENT(dir)) {
  3119. rpc_shutdown_client(client);
  3120. nfs_fixup_secinfo_attributes(fattr);
  3121. }
  3122. return status;
  3123. }
  3124. struct rpc_clnt *
  3125. nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
  3126. struct nfs_fh *fhandle, struct nfs_fattr *fattr)
  3127. {
  3128. struct rpc_clnt *client = NFS_CLIENT(dir);
  3129. int status;
  3130. status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, NULL);
  3131. if (status < 0)
  3132. return ERR_PTR(status);
  3133. return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
  3134. }
  3135. static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
  3136. {
  3137. struct nfs_server *server = NFS_SERVER(inode);
  3138. struct nfs4_accessargs args = {
  3139. .fh = NFS_FH(inode),
  3140. .bitmask = server->cache_consistency_bitmask,
  3141. };
  3142. struct nfs4_accessres res = {
  3143. .server = server,
  3144. };
  3145. struct rpc_message msg = {
  3146. .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
  3147. .rpc_argp = &args,
  3148. .rpc_resp = &res,
  3149. .rpc_cred = entry->cred,
  3150. };
  3151. int mode = entry->mask;
  3152. int status = 0;
  3153. /*
  3154. * Determine which access bits we want to ask for...
  3155. */
  3156. if (mode & MAY_READ)
  3157. args.access |= NFS4_ACCESS_READ;
  3158. if (S_ISDIR(inode->i_mode)) {
  3159. if (mode & MAY_WRITE)
  3160. args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
  3161. if (mode & MAY_EXEC)
  3162. args.access |= NFS4_ACCESS_LOOKUP;
  3163. } else {
  3164. if (mode & MAY_WRITE)
  3165. args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
  3166. if (mode & MAY_EXEC)
  3167. args.access |= NFS4_ACCESS_EXECUTE;
  3168. }
  3169. res.fattr = nfs_alloc_fattr();
  3170. if (res.fattr == NULL)
  3171. return -ENOMEM;
  3172. status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
  3173. if (!status) {
  3174. nfs_access_set_mask(entry, res.access);
  3175. nfs_refresh_inode(inode, res.fattr);
  3176. }
  3177. nfs_free_fattr(res.fattr);
  3178. return status;
  3179. }
  3180. static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
  3181. {
  3182. struct nfs4_exception exception = { };
  3183. int err;
  3184. do {
  3185. err = _nfs4_proc_access(inode, entry);
  3186. trace_nfs4_access(inode, err);
  3187. err = nfs4_handle_exception(NFS_SERVER(inode), err,
  3188. &exception);
  3189. } while (exception.retry);
  3190. return err;
  3191. }
  3192. /*
  3193. * TODO: For the time being, we don't try to get any attributes
  3194. * along with any of the zero-copy operations READ, READDIR,
  3195. * READLINK, WRITE.
  3196. *
  3197. * In the case of the first three, we want to put the GETATTR
  3198. * after the read-type operation -- this is because it is hard
  3199. * to predict the length of a GETATTR response in v4, and thus
  3200. * align the READ data correctly. This means that the GETATTR
  3201. * may end up partially falling into the page cache, and we should
  3202. * shift it into the 'tail' of the xdr_buf before processing.
  3203. * To do this efficiently, we need to know the total length
  3204. * of data received, which doesn't seem to be available outside
  3205. * of the RPC layer.
  3206. *
  3207. * In the case of WRITE, we also want to put the GETATTR after
  3208. * the operation -- in this case because we want to make sure
  3209. * we get the post-operation mtime and size.
  3210. *
  3211. * Both of these changes to the XDR layer would in fact be quite
  3212. * minor, but I decided to leave them for a subsequent patch.
  3213. */
  3214. static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
  3215. unsigned int pgbase, unsigned int pglen)
  3216. {
  3217. struct nfs4_readlink args = {
  3218. .fh = NFS_FH(inode),
  3219. .pgbase = pgbase,
  3220. .pglen = pglen,
  3221. .pages = &page,
  3222. };
  3223. struct nfs4_readlink_res res;
  3224. struct rpc_message msg = {
  3225. .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
  3226. .rpc_argp = &args,
  3227. .rpc_resp = &res,
  3228. };
  3229. return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
  3230. }
  3231. static int nfs4_proc_readlink(struct inode *inode, struct page *page,
  3232. unsigned int pgbase, unsigned int pglen)
  3233. {
  3234. struct nfs4_exception exception = { };
  3235. int err;
  3236. do {
  3237. err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
  3238. trace_nfs4_readlink(inode, err);
  3239. err = nfs4_handle_exception(NFS_SERVER(inode), err,
  3240. &exception);
  3241. } while (exception.retry);
  3242. return err;
  3243. }
  3244. /*
  3245. * This is just for mknod. open(O_CREAT) will always do ->open_context().
  3246. */
  3247. static int
  3248. nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
  3249. int flags)
  3250. {
  3251. struct nfs4_label l, *ilabel = NULL;
  3252. struct nfs_open_context *ctx;
  3253. struct nfs4_state *state;
  3254. int status = 0;
  3255. ctx = alloc_nfs_open_context(dentry, FMODE_READ);
  3256. if (IS_ERR(ctx))
  3257. return PTR_ERR(ctx);
  3258. ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
  3259. sattr->ia_mode &= ~current_umask();
  3260. state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, NULL);
  3261. if (IS_ERR(state)) {
  3262. status = PTR_ERR(state);
  3263. goto out;
  3264. }
  3265. out:
  3266. nfs4_label_release_security(ilabel);
  3267. put_nfs_open_context(ctx);
  3268. return status;
  3269. }
  3270. static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
  3271. {
  3272. struct nfs_server *server = NFS_SERVER(dir);
  3273. struct nfs_removeargs args = {
  3274. .fh = NFS_FH(dir),
  3275. .name = *name,
  3276. };
  3277. struct nfs_removeres res = {
  3278. .server = server,
  3279. };
  3280. struct rpc_message msg = {
  3281. .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
  3282. .rpc_argp = &args,
  3283. .rpc_resp = &res,
  3284. };
  3285. int status;
  3286. status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
  3287. if (status == 0)
  3288. update_changeattr(dir, &res.cinfo);
  3289. return status;
  3290. }
  3291. static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
  3292. {
  3293. struct nfs4_exception exception = { };
  3294. int err;
  3295. do {
  3296. err = _nfs4_proc_remove(dir, name);
  3297. trace_nfs4_remove(dir, name, err);
  3298. err = nfs4_handle_exception(NFS_SERVER(dir), err,
  3299. &exception);
  3300. } while (exception.retry);
  3301. return err;
  3302. }
  3303. static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
  3304. {
  3305. struct nfs_server *server = NFS_SERVER(dir);
  3306. struct nfs_removeargs *args = msg->rpc_argp;
  3307. struct nfs_removeres *res = msg->rpc_resp;
  3308. res->server = server;
  3309. msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
  3310. nfs4_init_sequence(&args->seq_args, &res->seq_res, 1);
  3311. nfs_fattr_init(res->dir_attr);
  3312. }
  3313. static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
  3314. {
  3315. nfs4_setup_sequence(NFS_SERVER(data->dir),
  3316. &data->args.seq_args,
  3317. &data->res.seq_res,
  3318. task);
  3319. }
  3320. static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
  3321. {
  3322. struct nfs_unlinkdata *data = task->tk_calldata;
  3323. struct nfs_removeres *res = &data->res;
  3324. if (!nfs4_sequence_done(task, &res->seq_res))
  3325. return 0;
  3326. if (nfs4_async_handle_error(task, res->server, NULL,
  3327. &data->timeout) == -EAGAIN)
  3328. return 0;
  3329. update_changeattr(dir, &res->cinfo);
  3330. return 1;
  3331. }
  3332. static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
  3333. {
  3334. struct nfs_server *server = NFS_SERVER(dir);
  3335. struct nfs_renameargs *arg = msg->rpc_argp;
  3336. struct nfs_renameres *res = msg->rpc_resp;
  3337. msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
  3338. res->server = server;
  3339. nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1);
  3340. }
  3341. static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
  3342. {
  3343. nfs4_setup_sequence(NFS_SERVER(data->old_dir),
  3344. &data->args.seq_args,
  3345. &data->res.seq_res,
  3346. task);
  3347. }
  3348. static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
  3349. struct inode *new_dir)
  3350. {
  3351. struct nfs_renamedata *data = task->tk_calldata;
  3352. struct nfs_renameres *res = &data->res;
  3353. if (!nfs4_sequence_done(task, &res->seq_res))
  3354. return 0;
  3355. if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN)
  3356. return 0;
  3357. update_changeattr(old_dir, &res->old_cinfo);
  3358. update_changeattr(new_dir, &res->new_cinfo);
  3359. return 1;
  3360. }
  3361. static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
  3362. {
  3363. struct nfs_server *server = NFS_SERVER(inode);
  3364. struct nfs4_link_arg arg = {
  3365. .fh = NFS_FH(inode),
  3366. .dir_fh = NFS_FH(dir),
  3367. .name = name,
  3368. .bitmask = server->attr_bitmask,
  3369. };
  3370. struct nfs4_link_res res = {
  3371. .server = server,
  3372. .label = NULL,
  3373. };
  3374. struct rpc_message msg = {
  3375. .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
  3376. .rpc_argp = &arg,
  3377. .rpc_resp = &res,
  3378. };
  3379. int status = -ENOMEM;
  3380. res.fattr = nfs_alloc_fattr();
  3381. if (res.fattr == NULL)
  3382. goto out;
  3383. res.label = nfs4_label_alloc(server, GFP_KERNEL);
  3384. if (IS_ERR(res.label)) {
  3385. status = PTR_ERR(res.label);
  3386. goto out;
  3387. }
  3388. arg.bitmask = nfs4_bitmask(server, res.label);
  3389. status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
  3390. if (!status) {
  3391. update_changeattr(dir, &res.cinfo);
  3392. status = nfs_post_op_update_inode(inode, res.fattr);
  3393. if (!status)
  3394. nfs_setsecurity(inode, res.fattr, res.label);
  3395. }
  3396. nfs4_label_free(res.label);
  3397. out:
  3398. nfs_free_fattr(res.fattr);
  3399. return status;
  3400. }
  3401. static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
  3402. {
  3403. struct nfs4_exception exception = { };
  3404. int err;
  3405. do {
  3406. err = nfs4_handle_exception(NFS_SERVER(inode),
  3407. _nfs4_proc_link(inode, dir, name),
  3408. &exception);
  3409. } while (exception.retry);
  3410. return err;
  3411. }
  3412. struct nfs4_createdata {
  3413. struct rpc_message msg;
  3414. struct nfs4_create_arg arg;
  3415. struct nfs4_create_res res;
  3416. struct nfs_fh fh;
  3417. struct nfs_fattr fattr;
  3418. struct nfs4_label *label;
  3419. };
  3420. static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
  3421. struct qstr *name, struct iattr *sattr, u32 ftype)
  3422. {
  3423. struct nfs4_createdata *data;
  3424. data = kzalloc(sizeof(*data), GFP_KERNEL);
  3425. if (data != NULL) {
  3426. struct nfs_server *server = NFS_SERVER(dir);
  3427. data->label = nfs4_label_alloc(server, GFP_KERNEL);
  3428. if (IS_ERR(data->label))
  3429. goto out_free;
  3430. data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
  3431. data->msg.rpc_argp = &data->arg;
  3432. data->msg.rpc_resp = &data->res;
  3433. data->arg.dir_fh = NFS_FH(dir);
  3434. data->arg.server = server;
  3435. data->arg.name = name;
  3436. data->arg.attrs = sattr;
  3437. data->arg.ftype = ftype;
  3438. data->arg.bitmask = nfs4_bitmask(server, data->label);
  3439. data->res.server = server;
  3440. data->res.fh = &data->fh;
  3441. data->res.fattr = &data->fattr;
  3442. data->res.label = data->label;
  3443. nfs_fattr_init(data->res.fattr);
  3444. }
  3445. return data;
  3446. out_free:
  3447. kfree(data);
  3448. return NULL;
  3449. }
  3450. static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
  3451. {
  3452. int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
  3453. &data->arg.seq_args, &data->res.seq_res, 1);
  3454. if (status == 0) {
  3455. update_changeattr(dir, &data->res.dir_cinfo);
  3456. status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label);
  3457. }
  3458. return status;
  3459. }
  3460. static void nfs4_free_createdata(struct nfs4_createdata *data)
  3461. {
  3462. nfs4_label_free(data->label);
  3463. kfree(data);
  3464. }
  3465. static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
  3466. struct page *page, unsigned int len, struct iattr *sattr,
  3467. struct nfs4_label *label)
  3468. {
  3469. struct nfs4_createdata *data;
  3470. int status = -ENAMETOOLONG;
  3471. if (len > NFS4_MAXPATHLEN)
  3472. goto out;
  3473. status = -ENOMEM;
  3474. data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
  3475. if (data == NULL)
  3476. goto out;
  3477. data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
  3478. data->arg.u.symlink.pages = &page;
  3479. data->arg.u.symlink.len = len;
  3480. data->arg.label = label;
  3481. status = nfs4_do_create(dir, dentry, data);
  3482. nfs4_free_createdata(data);
  3483. out:
  3484. return status;
  3485. }
  3486. static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
  3487. struct page *page, unsigned int len, struct iattr *sattr)
  3488. {
  3489. struct nfs4_exception exception = { };
  3490. struct nfs4_label l, *label = NULL;
  3491. int err;
  3492. label = nfs4_label_init_security(dir, dentry, sattr, &l);
  3493. do {
  3494. err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
  3495. trace_nfs4_symlink(dir, &dentry->d_name, err);
  3496. err = nfs4_handle_exception(NFS_SERVER(dir), err,
  3497. &exception);
  3498. } while (exception.retry);
  3499. nfs4_label_release_security(label);
  3500. return err;
  3501. }
  3502. static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
  3503. struct iattr *sattr, struct nfs4_label *label)
  3504. {
  3505. struct nfs4_createdata *data;
  3506. int status = -ENOMEM;
  3507. data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
  3508. if (data == NULL)
  3509. goto out;
  3510. data->arg.label = label;
  3511. status = nfs4_do_create(dir, dentry, data);
  3512. nfs4_free_createdata(data);
  3513. out:
  3514. return status;
  3515. }
  3516. static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
  3517. struct iattr *sattr)
  3518. {
  3519. struct nfs4_exception exception = { };
  3520. struct nfs4_label l, *label = NULL;
  3521. int err;
  3522. label = nfs4_label_init_security(dir, dentry, sattr, &l);
  3523. sattr->ia_mode &= ~current_umask();
  3524. do {
  3525. err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
  3526. trace_nfs4_mkdir(dir, &dentry->d_name, err);
  3527. err = nfs4_handle_exception(NFS_SERVER(dir), err,
  3528. &exception);
  3529. } while (exception.retry);
  3530. nfs4_label_release_security(label);
  3531. return err;
  3532. }
  3533. static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
  3534. u64 cookie, struct page **pages, unsigned int count, int plus)
  3535. {
  3536. struct inode *dir = d_inode(dentry);
  3537. struct nfs4_readdir_arg args = {
  3538. .fh = NFS_FH(dir),
  3539. .pages = pages,
  3540. .pgbase = 0,
  3541. .count = count,
  3542. .bitmask = NFS_SERVER(d_inode(dentry))->attr_bitmask,
  3543. .plus = plus,
  3544. };
  3545. struct nfs4_readdir_res res;
  3546. struct rpc_message msg = {
  3547. .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
  3548. .rpc_argp = &args,
  3549. .rpc_resp = &res,
  3550. .rpc_cred = cred,
  3551. };
  3552. int status;
  3553. dprintk("%s: dentry = %pd2, cookie = %Lu\n", __func__,
  3554. dentry,
  3555. (unsigned long long)cookie);
  3556. nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
  3557. res.pgbase = args.pgbase;
  3558. status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
  3559. if (status >= 0) {
  3560. memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
  3561. status += args.pgbase;
  3562. }
  3563. nfs_invalidate_atime(dir);
  3564. dprintk("%s: returns %d\n", __func__, status);
  3565. return status;
  3566. }
  3567. static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
  3568. u64 cookie, struct page **pages, unsigned int count, int plus)
  3569. {
  3570. struct nfs4_exception exception = { };
  3571. int err;
  3572. do {
  3573. err = _nfs4_proc_readdir(dentry, cred, cookie,
  3574. pages, count, plus);
  3575. trace_nfs4_readdir(d_inode(dentry), err);
  3576. err = nfs4_handle_exception(NFS_SERVER(d_inode(dentry)), err,
  3577. &exception);
  3578. } while (exception.retry);
  3579. return err;
  3580. }
  3581. static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
  3582. struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
  3583. {
  3584. struct nfs4_createdata *data;
  3585. int mode = sattr->ia_mode;
  3586. int status = -ENOMEM;
  3587. data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
  3588. if (data == NULL)
  3589. goto out;
  3590. if (S_ISFIFO(mode))
  3591. data->arg.ftype = NF4FIFO;
  3592. else if (S_ISBLK(mode)) {
  3593. data->arg.ftype = NF4BLK;
  3594. data->arg.u.device.specdata1 = MAJOR(rdev);
  3595. data->arg.u.device.specdata2 = MINOR(rdev);
  3596. }
  3597. else if (S_ISCHR(mode)) {
  3598. data->arg.ftype = NF4CHR;
  3599. data->arg.u.device.specdata1 = MAJOR(rdev);
  3600. data->arg.u.device.specdata2 = MINOR(rdev);
  3601. } else if (!S_ISSOCK(mode)) {
  3602. status = -EINVAL;
  3603. goto out_free;
  3604. }
  3605. data->arg.label = label;
  3606. status = nfs4_do_create(dir, dentry, data);
  3607. out_free:
  3608. nfs4_free_createdata(data);
  3609. out:
  3610. return status;
  3611. }
  3612. static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
  3613. struct iattr *sattr, dev_t rdev)
  3614. {
  3615. struct nfs4_exception exception = { };
  3616. struct nfs4_label l, *label = NULL;
  3617. int err;
  3618. label = nfs4_label_init_security(dir, dentry, sattr, &l);
  3619. sattr->ia_mode &= ~current_umask();
  3620. do {
  3621. err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
  3622. trace_nfs4_mknod(dir, &dentry->d_name, err);
  3623. err = nfs4_handle_exception(NFS_SERVER(dir), err,
  3624. &exception);
  3625. } while (exception.retry);
  3626. nfs4_label_release_security(label);
  3627. return err;
  3628. }
  3629. static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
  3630. struct nfs_fsstat *fsstat)
  3631. {
  3632. struct nfs4_statfs_arg args = {
  3633. .fh = fhandle,
  3634. .bitmask = server->attr_bitmask,
  3635. };
  3636. struct nfs4_statfs_res res = {
  3637. .fsstat = fsstat,
  3638. };
  3639. struct rpc_message msg = {
  3640. .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
  3641. .rpc_argp = &args,
  3642. .rpc_resp = &res,
  3643. };
  3644. nfs_fattr_init(fsstat->fattr);
  3645. return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
  3646. }
  3647. static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
  3648. {
  3649. struct nfs4_exception exception = { };
  3650. int err;
  3651. do {
  3652. err = nfs4_handle_exception(server,
  3653. _nfs4_proc_statfs(server, fhandle, fsstat),
  3654. &exception);
  3655. } while (exception.retry);
  3656. return err;
  3657. }
  3658. static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
  3659. struct nfs_fsinfo *fsinfo)
  3660. {
  3661. struct nfs4_fsinfo_arg args = {
  3662. .fh = fhandle,
  3663. .bitmask = server->attr_bitmask,
  3664. };
  3665. struct nfs4_fsinfo_res res = {
  3666. .fsinfo = fsinfo,
  3667. };
  3668. struct rpc_message msg = {
  3669. .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
  3670. .rpc_argp = &args,
  3671. .rpc_resp = &res,
  3672. };
  3673. return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
  3674. }
  3675. static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
  3676. {
  3677. struct nfs4_exception exception = { };
  3678. unsigned long now = jiffies;
  3679. int err;
  3680. do {
  3681. err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
  3682. trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
  3683. if (err == 0) {
  3684. struct nfs_client *clp = server->nfs_client;
  3685. spin_lock(&clp->cl_lock);
  3686. clp->cl_lease_time = fsinfo->lease_time * HZ;
  3687. clp->cl_last_renewal = now;
  3688. spin_unlock(&clp->cl_lock);
  3689. break;
  3690. }
  3691. err = nfs4_handle_exception(server, err, &exception);
  3692. } while (exception.retry);
  3693. return err;
  3694. }
  3695. static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
  3696. {
  3697. int error;
  3698. nfs_fattr_init(fsinfo->fattr);
  3699. error = nfs4_do_fsinfo(server, fhandle, fsinfo);
  3700. if (error == 0) {
  3701. /* block layout checks this! */
  3702. server->pnfs_blksize = fsinfo->blksize;
  3703. set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
  3704. }
  3705. return error;
  3706. }
  3707. static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
  3708. struct nfs_pathconf *pathconf)
  3709. {
  3710. struct nfs4_pathconf_arg args = {
  3711. .fh = fhandle,
  3712. .bitmask = server->attr_bitmask,
  3713. };
  3714. struct nfs4_pathconf_res res = {
  3715. .pathconf = pathconf,
  3716. };
  3717. struct rpc_message msg = {
  3718. .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
  3719. .rpc_argp = &args,
  3720. .rpc_resp = &res,
  3721. };
  3722. /* None of the pathconf attributes are mandatory to implement */
  3723. if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
  3724. memset(pathconf, 0, sizeof(*pathconf));
  3725. return 0;
  3726. }
  3727. nfs_fattr_init(pathconf->fattr);
  3728. return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
  3729. }
  3730. static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
  3731. struct nfs_pathconf *pathconf)
  3732. {
  3733. struct nfs4_exception exception = { };
  3734. int err;
  3735. do {
  3736. err = nfs4_handle_exception(server,
  3737. _nfs4_proc_pathconf(server, fhandle, pathconf),
  3738. &exception);
  3739. } while (exception.retry);
  3740. return err;
  3741. }
  3742. int nfs4_set_rw_stateid(nfs4_stateid *stateid,
  3743. const struct nfs_open_context *ctx,
  3744. const struct nfs_lock_context *l_ctx,
  3745. fmode_t fmode)
  3746. {
  3747. const struct nfs_lockowner *lockowner = NULL;
  3748. if (l_ctx != NULL)
  3749. lockowner = &l_ctx->lockowner;
  3750. return nfs4_select_rw_stateid(stateid, ctx->state, fmode, lockowner);
  3751. }
  3752. EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
  3753. static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
  3754. const struct nfs_open_context *ctx,
  3755. const struct nfs_lock_context *l_ctx,
  3756. fmode_t fmode)
  3757. {
  3758. nfs4_stateid current_stateid;
  3759. /* If the current stateid represents a lost lock, then exit */
  3760. if (nfs4_set_rw_stateid(&current_stateid, ctx, l_ctx, fmode) == -EIO)
  3761. return true;
  3762. return nfs4_stateid_match(stateid, &current_stateid);
  3763. }
  3764. static bool nfs4_error_stateid_expired(int err)
  3765. {
  3766. switch (err) {
  3767. case -NFS4ERR_DELEG_REVOKED:
  3768. case -NFS4ERR_ADMIN_REVOKED:
  3769. case -NFS4ERR_BAD_STATEID:
  3770. case -NFS4ERR_STALE_STATEID:
  3771. case -NFS4ERR_OLD_STATEID:
  3772. case -NFS4ERR_OPENMODE:
  3773. case -NFS4ERR_EXPIRED:
  3774. return true;
  3775. }
  3776. return false;
  3777. }
  3778. void __nfs4_read_done_cb(struct nfs_pgio_header *hdr)
  3779. {
  3780. nfs_invalidate_atime(hdr->inode);
  3781. }
  3782. static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr)
  3783. {
  3784. struct nfs_server *server = NFS_SERVER(hdr->inode);
  3785. trace_nfs4_read(hdr, task->tk_status);
  3786. if (nfs4_async_handle_error(task, server,
  3787. hdr->args.context->state,
  3788. NULL) == -EAGAIN) {
  3789. rpc_restart_call_prepare(task);
  3790. return -EAGAIN;
  3791. }
  3792. __nfs4_read_done_cb(hdr);
  3793. if (task->tk_status > 0)
  3794. renew_lease(server, hdr->timestamp);
  3795. return 0;
  3796. }
  3797. static bool nfs4_read_stateid_changed(struct rpc_task *task,
  3798. struct nfs_pgio_args *args)
  3799. {
  3800. if (!nfs4_error_stateid_expired(task->tk_status) ||
  3801. nfs4_stateid_is_current(&args->stateid,
  3802. args->context,
  3803. args->lock_context,
  3804. FMODE_READ))
  3805. return false;
  3806. rpc_restart_call_prepare(task);
  3807. return true;
  3808. }
  3809. static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
  3810. {
  3811. dprintk("--> %s\n", __func__);
  3812. if (!nfs4_sequence_done(task, &hdr->res.seq_res))
  3813. return -EAGAIN;
  3814. if (nfs4_read_stateid_changed(task, &hdr->args))
  3815. return -EAGAIN;
  3816. return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
  3817. nfs4_read_done_cb(task, hdr);
  3818. }
  3819. static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr,
  3820. struct rpc_message *msg)
  3821. {
  3822. hdr->timestamp = jiffies;
  3823. hdr->pgio_done_cb = nfs4_read_done_cb;
  3824. msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
  3825. nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0);
  3826. }
  3827. static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task,
  3828. struct nfs_pgio_header *hdr)
  3829. {
  3830. if (nfs4_setup_sequence(NFS_SERVER(hdr->inode),
  3831. &hdr->args.seq_args,
  3832. &hdr->res.seq_res,
  3833. task))
  3834. return 0;
  3835. if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
  3836. hdr->args.lock_context,
  3837. hdr->rw_ops->rw_mode) == -EIO)
  3838. return -EIO;
  3839. if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags)))
  3840. return -EIO;
  3841. return 0;
  3842. }
  3843. static int nfs4_write_done_cb(struct rpc_task *task,
  3844. struct nfs_pgio_header *hdr)
  3845. {
  3846. struct inode *inode = hdr->inode;
  3847. trace_nfs4_write(hdr, task->tk_status);
  3848. if (nfs4_async_handle_error(task, NFS_SERVER(inode),
  3849. hdr->args.context->state,
  3850. NULL) == -EAGAIN) {
  3851. rpc_restart_call_prepare(task);
  3852. return -EAGAIN;
  3853. }
  3854. if (task->tk_status >= 0) {
  3855. renew_lease(NFS_SERVER(inode), hdr->timestamp);
  3856. nfs_writeback_update_inode(hdr);
  3857. }
  3858. return 0;
  3859. }
  3860. static bool nfs4_write_stateid_changed(struct rpc_task *task,
  3861. struct nfs_pgio_args *args)
  3862. {
  3863. if (!nfs4_error_stateid_expired(task->tk_status) ||
  3864. nfs4_stateid_is_current(&args->stateid,
  3865. args->context,
  3866. args->lock_context,
  3867. FMODE_WRITE))
  3868. return false;
  3869. rpc_restart_call_prepare(task);
  3870. return true;
  3871. }
  3872. static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
  3873. {
  3874. if (!nfs4_sequence_done(task, &hdr->res.seq_res))
  3875. return -EAGAIN;
  3876. if (nfs4_write_stateid_changed(task, &hdr->args))
  3877. return -EAGAIN;
  3878. return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
  3879. nfs4_write_done_cb(task, hdr);
  3880. }
  3881. static
  3882. bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr)
  3883. {
  3884. /* Don't request attributes for pNFS or O_DIRECT writes */
  3885. if (hdr->ds_clp != NULL || hdr->dreq != NULL)
  3886. return false;
  3887. /* Otherwise, request attributes if and only if we don't hold
  3888. * a delegation
  3889. */
  3890. return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
  3891. }
  3892. static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr,
  3893. struct rpc_message *msg)
  3894. {
  3895. struct nfs_server *server = NFS_SERVER(hdr->inode);
  3896. if (!nfs4_write_need_cache_consistency_data(hdr)) {
  3897. hdr->args.bitmask = NULL;
  3898. hdr->res.fattr = NULL;
  3899. } else
  3900. hdr->args.bitmask = server->cache_consistency_bitmask;
  3901. if (!hdr->pgio_done_cb)
  3902. hdr->pgio_done_cb = nfs4_write_done_cb;
  3903. hdr->res.server = server;
  3904. hdr->timestamp = jiffies;
  3905. msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
  3906. nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 1);
  3907. }
  3908. static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
  3909. {
  3910. nfs4_setup_sequence(NFS_SERVER(data->inode),
  3911. &data->args.seq_args,
  3912. &data->res.seq_res,
  3913. task);
  3914. }
  3915. static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
  3916. {
  3917. struct inode *inode = data->inode;
  3918. trace_nfs4_commit(data, task->tk_status);
  3919. if (nfs4_async_handle_error(task, NFS_SERVER(inode),
  3920. NULL, NULL) == -EAGAIN) {
  3921. rpc_restart_call_prepare(task);
  3922. return -EAGAIN;
  3923. }
  3924. return 0;
  3925. }
  3926. static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
  3927. {
  3928. if (!nfs4_sequence_done(task, &data->res.seq_res))
  3929. return -EAGAIN;
  3930. return data->commit_done_cb(task, data);
  3931. }
  3932. static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
  3933. {
  3934. struct nfs_server *server = NFS_SERVER(data->inode);
  3935. if (data->commit_done_cb == NULL)
  3936. data->commit_done_cb = nfs4_commit_done_cb;
  3937. data->res.server = server;
  3938. msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
  3939. nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
  3940. }
  3941. struct nfs4_renewdata {
  3942. struct nfs_client *client;
  3943. unsigned long timestamp;
  3944. };
  3945. /*
  3946. * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
  3947. * standalone procedure for queueing an asynchronous RENEW.
  3948. */
  3949. static void nfs4_renew_release(void *calldata)
  3950. {
  3951. struct nfs4_renewdata *data = calldata;
  3952. struct nfs_client *clp = data->client;
  3953. if (atomic_read(&clp->cl_count) > 1)
  3954. nfs4_schedule_state_renewal(clp);
  3955. nfs_put_client(clp);
  3956. kfree(data);
  3957. }
  3958. static void nfs4_renew_done(struct rpc_task *task, void *calldata)
  3959. {
  3960. struct nfs4_renewdata *data = calldata;
  3961. struct nfs_client *clp = data->client;
  3962. unsigned long timestamp = data->timestamp;
  3963. trace_nfs4_renew_async(clp, task->tk_status);
  3964. switch (task->tk_status) {
  3965. case 0:
  3966. break;
  3967. case -NFS4ERR_LEASE_MOVED:
  3968. nfs4_schedule_lease_moved_recovery(clp);
  3969. break;
  3970. default:
  3971. /* Unless we're shutting down, schedule state recovery! */
  3972. if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
  3973. return;
  3974. if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
  3975. nfs4_schedule_lease_recovery(clp);
  3976. return;
  3977. }
  3978. nfs4_schedule_path_down_recovery(clp);
  3979. }
  3980. do_renew_lease(clp, timestamp);
  3981. }
  3982. static const struct rpc_call_ops nfs4_renew_ops = {
  3983. .rpc_call_done = nfs4_renew_done,
  3984. .rpc_release = nfs4_renew_release,
  3985. };
  3986. static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
  3987. {
  3988. struct rpc_message msg = {
  3989. .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
  3990. .rpc_argp = clp,
  3991. .rpc_cred = cred,
  3992. };
  3993. struct nfs4_renewdata *data;
  3994. if (renew_flags == 0)
  3995. return 0;
  3996. if (!atomic_inc_not_zero(&clp->cl_count))
  3997. return -EIO;
  3998. data = kmalloc(sizeof(*data), GFP_NOFS);
  3999. if (data == NULL)
  4000. return -ENOMEM;
  4001. data->client = clp;
  4002. data->timestamp = jiffies;
  4003. return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
  4004. &nfs4_renew_ops, data);
  4005. }
  4006. static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
  4007. {
  4008. struct rpc_message msg = {
  4009. .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
  4010. .rpc_argp = clp,
  4011. .rpc_cred = cred,
  4012. };
  4013. unsigned long now = jiffies;
  4014. int status;
  4015. status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
  4016. if (status < 0)
  4017. return status;
  4018. do_renew_lease(clp, now);
  4019. return 0;
  4020. }
  4021. static inline int nfs4_server_supports_acls(struct nfs_server *server)
  4022. {
  4023. return server->caps & NFS_CAP_ACLS;
  4024. }
  4025. /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
  4026. * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
  4027. * the stack.
  4028. */
  4029. #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
  4030. static int buf_to_pages_noslab(const void *buf, size_t buflen,
  4031. struct page **pages, unsigned int *pgbase)
  4032. {
  4033. struct page *newpage, **spages;
  4034. int rc = 0;
  4035. size_t len;
  4036. spages = pages;
  4037. do {
  4038. len = min_t(size_t, PAGE_SIZE, buflen);
  4039. newpage = alloc_page(GFP_KERNEL);
  4040. if (newpage == NULL)
  4041. goto unwind;
  4042. memcpy(page_address(newpage), buf, len);
  4043. buf += len;
  4044. buflen -= len;
  4045. *pages++ = newpage;
  4046. rc++;
  4047. } while (buflen != 0);
  4048. return rc;
  4049. unwind:
  4050. for(; rc > 0; rc--)
  4051. __free_page(spages[rc-1]);
  4052. return -ENOMEM;
  4053. }
  4054. struct nfs4_cached_acl {
  4055. int cached;
  4056. size_t len;
  4057. char data[0];
  4058. };
  4059. static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
  4060. {
  4061. struct nfs_inode *nfsi = NFS_I(inode);
  4062. spin_lock(&inode->i_lock);
  4063. kfree(nfsi->nfs4_acl);
  4064. nfsi->nfs4_acl = acl;
  4065. spin_unlock(&inode->i_lock);
  4066. }
  4067. static void nfs4_zap_acl_attr(struct inode *inode)
  4068. {
  4069. nfs4_set_cached_acl(inode, NULL);
  4070. }
  4071. static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
  4072. {
  4073. struct nfs_inode *nfsi = NFS_I(inode);
  4074. struct nfs4_cached_acl *acl;
  4075. int ret = -ENOENT;
  4076. spin_lock(&inode->i_lock);
  4077. acl = nfsi->nfs4_acl;
  4078. if (acl == NULL)
  4079. goto out;
  4080. if (buf == NULL) /* user is just asking for length */
  4081. goto out_len;
  4082. if (acl->cached == 0)
  4083. goto out;
  4084. ret = -ERANGE; /* see getxattr(2) man page */
  4085. if (acl->len > buflen)
  4086. goto out;
  4087. memcpy(buf, acl->data, acl->len);
  4088. out_len:
  4089. ret = acl->len;
  4090. out:
  4091. spin_unlock(&inode->i_lock);
  4092. return ret;
  4093. }
  4094. static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
  4095. {
  4096. struct nfs4_cached_acl *acl;
  4097. size_t buflen = sizeof(*acl) + acl_len;
  4098. if (buflen <= PAGE_SIZE) {
  4099. acl = kmalloc(buflen, GFP_KERNEL);
  4100. if (acl == NULL)
  4101. goto out;
  4102. acl->cached = 1;
  4103. _copy_from_pages(acl->data, pages, pgbase, acl_len);
  4104. } else {
  4105. acl = kmalloc(sizeof(*acl), GFP_KERNEL);
  4106. if (acl == NULL)
  4107. goto out;
  4108. acl->cached = 0;
  4109. }
  4110. acl->len = acl_len;
  4111. out:
  4112. nfs4_set_cached_acl(inode, acl);
  4113. }
  4114. /*
  4115. * The getxattr API returns the required buffer length when called with a
  4116. * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
  4117. * the required buf. On a NULL buf, we send a page of data to the server
  4118. * guessing that the ACL request can be serviced by a page. If so, we cache
  4119. * up to the page of ACL data, and the 2nd call to getxattr is serviced by
  4120. * the cache. If not so, we throw away the page, and cache the required
  4121. * length. The next getxattr call will then produce another round trip to
  4122. * the server, this time with the input buf of the required size.
  4123. */
  4124. static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
  4125. {
  4126. struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
  4127. struct nfs_getaclargs args = {
  4128. .fh = NFS_FH(inode),
  4129. .acl_pages = pages,
  4130. .acl_len = buflen,
  4131. };
  4132. struct nfs_getaclres res = {
  4133. .acl_len = buflen,
  4134. };
  4135. struct rpc_message msg = {
  4136. .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
  4137. .rpc_argp = &args,
  4138. .rpc_resp = &res,
  4139. };
  4140. unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
  4141. int ret = -ENOMEM, i;
  4142. /* As long as we're doing a round trip to the server anyway,
  4143. * let's be prepared for a page of acl data. */
  4144. if (npages == 0)
  4145. npages = 1;
  4146. if (npages > ARRAY_SIZE(pages))
  4147. return -ERANGE;
  4148. for (i = 0; i < npages; i++) {
  4149. pages[i] = alloc_page(GFP_KERNEL);
  4150. if (!pages[i])
  4151. goto out_free;
  4152. }
  4153. /* for decoding across pages */
  4154. res.acl_scratch = alloc_page(GFP_KERNEL);
  4155. if (!res.acl_scratch)
  4156. goto out_free;
  4157. args.acl_len = npages * PAGE_SIZE;
  4158. args.acl_pgbase = 0;
  4159. dprintk("%s buf %p buflen %zu npages %d args.acl_len %zu\n",
  4160. __func__, buf, buflen, npages, args.acl_len);
  4161. ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
  4162. &msg, &args.seq_args, &res.seq_res, 0);
  4163. if (ret)
  4164. goto out_free;
  4165. /* Handle the case where the passed-in buffer is too short */
  4166. if (res.acl_flags & NFS4_ACL_TRUNC) {
  4167. /* Did the user only issue a request for the acl length? */
  4168. if (buf == NULL)
  4169. goto out_ok;
  4170. ret = -ERANGE;
  4171. goto out_free;
  4172. }
  4173. nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
  4174. if (buf) {
  4175. if (res.acl_len > buflen) {
  4176. ret = -ERANGE;
  4177. goto out_free;
  4178. }
  4179. _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
  4180. }
  4181. out_ok:
  4182. ret = res.acl_len;
  4183. out_free:
  4184. for (i = 0; i < npages; i++)
  4185. if (pages[i])
  4186. __free_page(pages[i]);
  4187. if (res.acl_scratch)
  4188. __free_page(res.acl_scratch);
  4189. return ret;
  4190. }
  4191. static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
  4192. {
  4193. struct nfs4_exception exception = { };
  4194. ssize_t ret;
  4195. do {
  4196. ret = __nfs4_get_acl_uncached(inode, buf, buflen);
  4197. trace_nfs4_get_acl(inode, ret);
  4198. if (ret >= 0)
  4199. break;
  4200. ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
  4201. } while (exception.retry);
  4202. return ret;
  4203. }
  4204. static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
  4205. {
  4206. struct nfs_server *server = NFS_SERVER(inode);
  4207. int ret;
  4208. if (!nfs4_server_supports_acls(server))
  4209. return -EOPNOTSUPP;
  4210. ret = nfs_revalidate_inode(server, inode);
  4211. if (ret < 0)
  4212. return ret;
  4213. if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
  4214. nfs_zap_acl_cache(inode);
  4215. ret = nfs4_read_cached_acl(inode, buf, buflen);
  4216. if (ret != -ENOENT)
  4217. /* -ENOENT is returned if there is no ACL or if there is an ACL
  4218. * but no cached acl data, just the acl length */
  4219. return ret;
  4220. return nfs4_get_acl_uncached(inode, buf, buflen);
  4221. }
  4222. static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
  4223. {
  4224. struct nfs_server *server = NFS_SERVER(inode);
  4225. struct page *pages[NFS4ACL_MAXPAGES];
  4226. struct nfs_setaclargs arg = {
  4227. .fh = NFS_FH(inode),
  4228. .acl_pages = pages,
  4229. .acl_len = buflen,
  4230. };
  4231. struct nfs_setaclres res;
  4232. struct rpc_message msg = {
  4233. .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
  4234. .rpc_argp = &arg,
  4235. .rpc_resp = &res,
  4236. };
  4237. unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
  4238. int ret, i;
  4239. if (!nfs4_server_supports_acls(server))
  4240. return -EOPNOTSUPP;
  4241. if (npages > ARRAY_SIZE(pages))
  4242. return -ERANGE;
  4243. i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
  4244. if (i < 0)
  4245. return i;
  4246. nfs4_inode_return_delegation(inode);
  4247. ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
  4248. /*
  4249. * Free each page after tx, so the only ref left is
  4250. * held by the network stack
  4251. */
  4252. for (; i > 0; i--)
  4253. put_page(pages[i-1]);
  4254. /*
  4255. * Acl update can result in inode attribute update.
  4256. * so mark the attribute cache invalid.
  4257. */
  4258. spin_lock(&inode->i_lock);
  4259. NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
  4260. spin_unlock(&inode->i_lock);
  4261. nfs_access_zap_cache(inode);
  4262. nfs_zap_acl_cache(inode);
  4263. return ret;
  4264. }
  4265. static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
  4266. {
  4267. struct nfs4_exception exception = { };
  4268. int err;
  4269. do {
  4270. err = __nfs4_proc_set_acl(inode, buf, buflen);
  4271. trace_nfs4_set_acl(inode, err);
  4272. err = nfs4_handle_exception(NFS_SERVER(inode), err,
  4273. &exception);
  4274. } while (exception.retry);
  4275. return err;
  4276. }
  4277. #ifdef CONFIG_NFS_V4_SECURITY_LABEL
  4278. static int _nfs4_get_security_label(struct inode *inode, void *buf,
  4279. size_t buflen)
  4280. {
  4281. struct nfs_server *server = NFS_SERVER(inode);
  4282. struct nfs_fattr fattr;
  4283. struct nfs4_label label = {0, 0, buflen, buf};
  4284. u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
  4285. struct nfs4_getattr_arg arg = {
  4286. .fh = NFS_FH(inode),
  4287. .bitmask = bitmask,
  4288. };
  4289. struct nfs4_getattr_res res = {
  4290. .fattr = &fattr,
  4291. .label = &label,
  4292. .server = server,
  4293. };
  4294. struct rpc_message msg = {
  4295. .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
  4296. .rpc_argp = &arg,
  4297. .rpc_resp = &res,
  4298. };
  4299. int ret;
  4300. nfs_fattr_init(&fattr);
  4301. ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
  4302. if (ret)
  4303. return ret;
  4304. if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
  4305. return -ENOENT;
  4306. if (buflen < label.len)
  4307. return -ERANGE;
  4308. return 0;
  4309. }
  4310. static int nfs4_get_security_label(struct inode *inode, void *buf,
  4311. size_t buflen)
  4312. {
  4313. struct nfs4_exception exception = { };
  4314. int err;
  4315. if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
  4316. return -EOPNOTSUPP;
  4317. do {
  4318. err = _nfs4_get_security_label(inode, buf, buflen);
  4319. trace_nfs4_get_security_label(inode, err);
  4320. err = nfs4_handle_exception(NFS_SERVER(inode), err,
  4321. &exception);
  4322. } while (exception.retry);
  4323. return err;
  4324. }
  4325. static int _nfs4_do_set_security_label(struct inode *inode,
  4326. struct nfs4_label *ilabel,
  4327. struct nfs_fattr *fattr,
  4328. struct nfs4_label *olabel)
  4329. {
  4330. struct iattr sattr = {0};
  4331. struct nfs_server *server = NFS_SERVER(inode);
  4332. const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
  4333. struct nfs_setattrargs arg = {
  4334. .fh = NFS_FH(inode),
  4335. .iap = &sattr,
  4336. .server = server,
  4337. .bitmask = bitmask,
  4338. .label = ilabel,
  4339. };
  4340. struct nfs_setattrres res = {
  4341. .fattr = fattr,
  4342. .label = olabel,
  4343. .server = server,
  4344. };
  4345. struct rpc_message msg = {
  4346. .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
  4347. .rpc_argp = &arg,
  4348. .rpc_resp = &res,
  4349. };
  4350. int status;
  4351. nfs4_stateid_copy(&arg.stateid, &zero_stateid);
  4352. status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
  4353. if (status)
  4354. dprintk("%s failed: %d\n", __func__, status);
  4355. return status;
  4356. }
  4357. static int nfs4_do_set_security_label(struct inode *inode,
  4358. struct nfs4_label *ilabel,
  4359. struct nfs_fattr *fattr,
  4360. struct nfs4_label *olabel)
  4361. {
  4362. struct nfs4_exception exception = { };
  4363. int err;
  4364. do {
  4365. err = _nfs4_do_set_security_label(inode, ilabel,
  4366. fattr, olabel);
  4367. trace_nfs4_set_security_label(inode, err);
  4368. err = nfs4_handle_exception(NFS_SERVER(inode), err,
  4369. &exception);
  4370. } while (exception.retry);
  4371. return err;
  4372. }
  4373. static int
  4374. nfs4_set_security_label(struct dentry *dentry, const void *buf, size_t buflen)
  4375. {
  4376. struct nfs4_label ilabel, *olabel = NULL;
  4377. struct nfs_fattr fattr;
  4378. struct rpc_cred *cred;
  4379. struct inode *inode = d_inode(dentry);
  4380. int status;
  4381. if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
  4382. return -EOPNOTSUPP;
  4383. nfs_fattr_init(&fattr);
  4384. ilabel.pi = 0;
  4385. ilabel.lfs = 0;
  4386. ilabel.label = (char *)buf;
  4387. ilabel.len = buflen;
  4388. cred = rpc_lookup_cred();
  4389. if (IS_ERR(cred))
  4390. return PTR_ERR(cred);
  4391. olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
  4392. if (IS_ERR(olabel)) {
  4393. status = -PTR_ERR(olabel);
  4394. goto out;
  4395. }
  4396. status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel);
  4397. if (status == 0)
  4398. nfs_setsecurity(inode, &fattr, olabel);
  4399. nfs4_label_free(olabel);
  4400. out:
  4401. put_rpccred(cred);
  4402. return status;
  4403. }
  4404. #endif /* CONFIG_NFS_V4_SECURITY_LABEL */
  4405. static int
  4406. nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server,
  4407. struct nfs4_state *state, long *timeout)
  4408. {
  4409. struct nfs_client *clp = server->nfs_client;
  4410. if (task->tk_status >= 0)
  4411. return 0;
  4412. switch(task->tk_status) {
  4413. case -NFS4ERR_DELEG_REVOKED:
  4414. case -NFS4ERR_ADMIN_REVOKED:
  4415. case -NFS4ERR_BAD_STATEID:
  4416. case -NFS4ERR_OPENMODE:
  4417. if (state == NULL)
  4418. break;
  4419. if (nfs4_schedule_stateid_recovery(server, state) < 0)
  4420. goto recovery_failed;
  4421. goto wait_on_recovery;
  4422. case -NFS4ERR_EXPIRED:
  4423. if (state != NULL) {
  4424. if (nfs4_schedule_stateid_recovery(server, state) < 0)
  4425. goto recovery_failed;
  4426. }
  4427. case -NFS4ERR_STALE_STATEID:
  4428. case -NFS4ERR_STALE_CLIENTID:
  4429. nfs4_schedule_lease_recovery(clp);
  4430. goto wait_on_recovery;
  4431. case -NFS4ERR_MOVED:
  4432. if (nfs4_schedule_migration_recovery(server) < 0)
  4433. goto recovery_failed;
  4434. goto wait_on_recovery;
  4435. case -NFS4ERR_LEASE_MOVED:
  4436. nfs4_schedule_lease_moved_recovery(clp);
  4437. goto wait_on_recovery;
  4438. #if defined(CONFIG_NFS_V4_1)
  4439. case -NFS4ERR_BADSESSION:
  4440. case -NFS4ERR_BADSLOT:
  4441. case -NFS4ERR_BAD_HIGH_SLOT:
  4442. case -NFS4ERR_DEADSESSION:
  4443. case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
  4444. case -NFS4ERR_SEQ_FALSE_RETRY:
  4445. case -NFS4ERR_SEQ_MISORDERED:
  4446. dprintk("%s ERROR %d, Reset session\n", __func__,
  4447. task->tk_status);
  4448. nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
  4449. goto wait_on_recovery;
  4450. #endif /* CONFIG_NFS_V4_1 */
  4451. case -NFS4ERR_DELAY:
  4452. nfs_inc_server_stats(server, NFSIOS_DELAY);
  4453. rpc_delay(task, nfs4_update_delay(timeout));
  4454. goto restart_call;
  4455. case -NFS4ERR_GRACE:
  4456. rpc_delay(task, NFS4_POLL_RETRY_MAX);
  4457. case -NFS4ERR_RETRY_UNCACHED_REP:
  4458. case -NFS4ERR_OLD_STATEID:
  4459. goto restart_call;
  4460. }
  4461. task->tk_status = nfs4_map_errors(task->tk_status);
  4462. return 0;
  4463. recovery_failed:
  4464. task->tk_status = -EIO;
  4465. return 0;
  4466. wait_on_recovery:
  4467. rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
  4468. if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
  4469. rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
  4470. if (test_bit(NFS_MIG_FAILED, &server->mig_status))
  4471. goto recovery_failed;
  4472. restart_call:
  4473. task->tk_status = 0;
  4474. return -EAGAIN;
  4475. }
  4476. static void nfs4_init_boot_verifier(const struct nfs_client *clp,
  4477. nfs4_verifier *bootverf)
  4478. {
  4479. __be32 verf[2];
  4480. if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
  4481. /* An impossible timestamp guarantees this value
  4482. * will never match a generated boot time. */
  4483. verf[0] = 0;
  4484. verf[1] = cpu_to_be32(NSEC_PER_SEC + 1);
  4485. } else {
  4486. struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
  4487. verf[0] = cpu_to_be32(nn->boot_time.tv_sec);
  4488. verf[1] = cpu_to_be32(nn->boot_time.tv_nsec);
  4489. }
  4490. memcpy(bootverf->data, verf, sizeof(bootverf->data));
  4491. }
  4492. static int
  4493. nfs4_init_nonuniform_client_string(struct nfs_client *clp)
  4494. {
  4495. int result;
  4496. size_t len;
  4497. char *str;
  4498. if (clp->cl_owner_id != NULL)
  4499. return 0;
  4500. rcu_read_lock();
  4501. len = 14 + strlen(clp->cl_ipaddr) + 1 +
  4502. strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)) +
  4503. 1 +
  4504. strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_PROTO)) +
  4505. 1;
  4506. rcu_read_unlock();
  4507. if (len > NFS4_OPAQUE_LIMIT + 1)
  4508. return -EINVAL;
  4509. /*
  4510. * Since this string is allocated at mount time, and held until the
  4511. * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
  4512. * about a memory-reclaim deadlock.
  4513. */
  4514. str = kmalloc(len, GFP_KERNEL);
  4515. if (!str)
  4516. return -ENOMEM;
  4517. rcu_read_lock();
  4518. result = scnprintf(str, len, "Linux NFSv4.0 %s/%s %s",
  4519. clp->cl_ipaddr,
  4520. rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR),
  4521. rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_PROTO));
  4522. rcu_read_unlock();
  4523. clp->cl_owner_id = str;
  4524. return 0;
  4525. }
  4526. static int
  4527. nfs4_init_uniquifier_client_string(struct nfs_client *clp)
  4528. {
  4529. int result;
  4530. size_t len;
  4531. char *str;
  4532. len = 10 + 10 + 1 + 10 + 1 +
  4533. strlen(nfs4_client_id_uniquifier) + 1 +
  4534. strlen(clp->cl_rpcclient->cl_nodename) + 1;
  4535. if (len > NFS4_OPAQUE_LIMIT + 1)
  4536. return -EINVAL;
  4537. /*
  4538. * Since this string is allocated at mount time, and held until the
  4539. * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
  4540. * about a memory-reclaim deadlock.
  4541. */
  4542. str = kmalloc(len, GFP_KERNEL);
  4543. if (!str)
  4544. return -ENOMEM;
  4545. result = scnprintf(str, len, "Linux NFSv%u.%u %s/%s",
  4546. clp->rpc_ops->version, clp->cl_minorversion,
  4547. nfs4_client_id_uniquifier,
  4548. clp->cl_rpcclient->cl_nodename);
  4549. clp->cl_owner_id = str;
  4550. return 0;
  4551. }
  4552. static int
  4553. nfs4_init_uniform_client_string(struct nfs_client *clp)
  4554. {
  4555. int result;
  4556. size_t len;
  4557. char *str;
  4558. if (clp->cl_owner_id != NULL)
  4559. return 0;
  4560. if (nfs4_client_id_uniquifier[0] != '\0')
  4561. return nfs4_init_uniquifier_client_string(clp);
  4562. len = 10 + 10 + 1 + 10 + 1 +
  4563. strlen(clp->cl_rpcclient->cl_nodename) + 1;
  4564. if (len > NFS4_OPAQUE_LIMIT + 1)
  4565. return -EINVAL;
  4566. /*
  4567. * Since this string is allocated at mount time, and held until the
  4568. * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
  4569. * about a memory-reclaim deadlock.
  4570. */
  4571. str = kmalloc(len, GFP_KERNEL);
  4572. if (!str)
  4573. return -ENOMEM;
  4574. result = scnprintf(str, len, "Linux NFSv%u.%u %s",
  4575. clp->rpc_ops->version, clp->cl_minorversion,
  4576. clp->cl_rpcclient->cl_nodename);
  4577. clp->cl_owner_id = str;
  4578. return 0;
  4579. }
  4580. /*
  4581. * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback
  4582. * services. Advertise one based on the address family of the
  4583. * clientaddr.
  4584. */
  4585. static unsigned int
  4586. nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
  4587. {
  4588. if (strchr(clp->cl_ipaddr, ':') != NULL)
  4589. return scnprintf(buf, len, "tcp6");
  4590. else
  4591. return scnprintf(buf, len, "tcp");
  4592. }
  4593. static void nfs4_setclientid_done(struct rpc_task *task, void *calldata)
  4594. {
  4595. struct nfs4_setclientid *sc = calldata;
  4596. if (task->tk_status == 0)
  4597. sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred);
  4598. }
  4599. static const struct rpc_call_ops nfs4_setclientid_ops = {
  4600. .rpc_call_done = nfs4_setclientid_done,
  4601. };
  4602. /**
  4603. * nfs4_proc_setclientid - Negotiate client ID
  4604. * @clp: state data structure
  4605. * @program: RPC program for NFSv4 callback service
  4606. * @port: IP port number for NFS4 callback service
  4607. * @cred: RPC credential to use for this call
  4608. * @res: where to place the result
  4609. *
  4610. * Returns zero, a negative errno, or a negative NFS4ERR status code.
  4611. */
  4612. int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
  4613. unsigned short port, struct rpc_cred *cred,
  4614. struct nfs4_setclientid_res *res)
  4615. {
  4616. nfs4_verifier sc_verifier;
  4617. struct nfs4_setclientid setclientid = {
  4618. .sc_verifier = &sc_verifier,
  4619. .sc_prog = program,
  4620. .sc_clnt = clp,
  4621. };
  4622. struct rpc_message msg = {
  4623. .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
  4624. .rpc_argp = &setclientid,
  4625. .rpc_resp = res,
  4626. .rpc_cred = cred,
  4627. };
  4628. struct rpc_task *task;
  4629. struct rpc_task_setup task_setup_data = {
  4630. .rpc_client = clp->cl_rpcclient,
  4631. .rpc_message = &msg,
  4632. .callback_ops = &nfs4_setclientid_ops,
  4633. .callback_data = &setclientid,
  4634. .flags = RPC_TASK_TIMEOUT,
  4635. };
  4636. int status;
  4637. /* nfs_client_id4 */
  4638. nfs4_init_boot_verifier(clp, &sc_verifier);
  4639. if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
  4640. status = nfs4_init_uniform_client_string(clp);
  4641. else
  4642. status = nfs4_init_nonuniform_client_string(clp);
  4643. if (status)
  4644. goto out;
  4645. /* cb_client4 */
  4646. setclientid.sc_netid_len =
  4647. nfs4_init_callback_netid(clp,
  4648. setclientid.sc_netid,
  4649. sizeof(setclientid.sc_netid));
  4650. setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
  4651. sizeof(setclientid.sc_uaddr), "%s.%u.%u",
  4652. clp->cl_ipaddr, port >> 8, port & 255);
  4653. dprintk("NFS call setclientid auth=%s, '%s'\n",
  4654. clp->cl_rpcclient->cl_auth->au_ops->au_name,
  4655. clp->cl_owner_id);
  4656. task = rpc_run_task(&task_setup_data);
  4657. if (IS_ERR(task)) {
  4658. status = PTR_ERR(task);
  4659. goto out;
  4660. }
  4661. status = task->tk_status;
  4662. if (setclientid.sc_cred) {
  4663. clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);
  4664. put_rpccred(setclientid.sc_cred);
  4665. }
  4666. rpc_put_task(task);
  4667. out:
  4668. trace_nfs4_setclientid(clp, status);
  4669. dprintk("NFS reply setclientid: %d\n", status);
  4670. return status;
  4671. }
  4672. /**
  4673. * nfs4_proc_setclientid_confirm - Confirm client ID
  4674. * @clp: state data structure
  4675. * @res: result of a previous SETCLIENTID
  4676. * @cred: RPC credential to use for this call
  4677. *
  4678. * Returns zero, a negative errno, or a negative NFS4ERR status code.
  4679. */
  4680. int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
  4681. struct nfs4_setclientid_res *arg,
  4682. struct rpc_cred *cred)
  4683. {
  4684. struct rpc_message msg = {
  4685. .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
  4686. .rpc_argp = arg,
  4687. .rpc_cred = cred,
  4688. };
  4689. int status;
  4690. dprintk("NFS call setclientid_confirm auth=%s, (client ID %llx)\n",
  4691. clp->cl_rpcclient->cl_auth->au_ops->au_name,
  4692. clp->cl_clientid);
  4693. status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
  4694. trace_nfs4_setclientid_confirm(clp, status);
  4695. dprintk("NFS reply setclientid_confirm: %d\n", status);
  4696. return status;
  4697. }
  4698. struct nfs4_delegreturndata {
  4699. struct nfs4_delegreturnargs args;
  4700. struct nfs4_delegreturnres res;
  4701. struct nfs_fh fh;
  4702. nfs4_stateid stateid;
  4703. unsigned long timestamp;
  4704. struct nfs_fattr fattr;
  4705. int rpc_status;
  4706. struct inode *inode;
  4707. bool roc;
  4708. u32 roc_barrier;
  4709. };
  4710. static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
  4711. {
  4712. struct nfs4_delegreturndata *data = calldata;
  4713. if (!nfs4_sequence_done(task, &data->res.seq_res))
  4714. return;
  4715. trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
  4716. switch (task->tk_status) {
  4717. case 0:
  4718. renew_lease(data->res.server, data->timestamp);
  4719. case -NFS4ERR_ADMIN_REVOKED:
  4720. case -NFS4ERR_DELEG_REVOKED:
  4721. case -NFS4ERR_BAD_STATEID:
  4722. case -NFS4ERR_OLD_STATEID:
  4723. case -NFS4ERR_STALE_STATEID:
  4724. case -NFS4ERR_EXPIRED:
  4725. task->tk_status = 0;
  4726. if (data->roc)
  4727. pnfs_roc_set_barrier(data->inode, data->roc_barrier);
  4728. break;
  4729. default:
  4730. if (nfs4_async_handle_error(task, data->res.server,
  4731. NULL, NULL) == -EAGAIN) {
  4732. rpc_restart_call_prepare(task);
  4733. return;
  4734. }
  4735. }
  4736. data->rpc_status = task->tk_status;
  4737. }
  4738. static void nfs4_delegreturn_release(void *calldata)
  4739. {
  4740. struct nfs4_delegreturndata *data = calldata;
  4741. struct inode *inode = data->inode;
  4742. if (inode) {
  4743. if (data->roc)
  4744. pnfs_roc_release(inode);
  4745. nfs_iput_and_deactive(inode);
  4746. }
  4747. kfree(calldata);
  4748. }
  4749. static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
  4750. {
  4751. struct nfs4_delegreturndata *d_data;
  4752. d_data = (struct nfs4_delegreturndata *)data;
  4753. if (nfs4_wait_on_layoutreturn(d_data->inode, task))
  4754. return;
  4755. if (d_data->roc)
  4756. pnfs_roc_get_barrier(d_data->inode, &d_data->roc_barrier);
  4757. nfs4_setup_sequence(d_data->res.server,
  4758. &d_data->args.seq_args,
  4759. &d_data->res.seq_res,
  4760. task);
  4761. }
  4762. static const struct rpc_call_ops nfs4_delegreturn_ops = {
  4763. .rpc_call_prepare = nfs4_delegreturn_prepare,
  4764. .rpc_call_done = nfs4_delegreturn_done,
  4765. .rpc_release = nfs4_delegreturn_release,
  4766. };
  4767. static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
  4768. {
  4769. struct nfs4_delegreturndata *data;
  4770. struct nfs_server *server = NFS_SERVER(inode);
  4771. struct rpc_task *task;
  4772. struct rpc_message msg = {
  4773. .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
  4774. .rpc_cred = cred,
  4775. };
  4776. struct rpc_task_setup task_setup_data = {
  4777. .rpc_client = server->client,
  4778. .rpc_message = &msg,
  4779. .callback_ops = &nfs4_delegreturn_ops,
  4780. .flags = RPC_TASK_ASYNC,
  4781. };
  4782. int status = 0;
  4783. data = kzalloc(sizeof(*data), GFP_NOFS);
  4784. if (data == NULL)
  4785. return -ENOMEM;
  4786. nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
  4787. data->args.fhandle = &data->fh;
  4788. data->args.stateid = &data->stateid;
  4789. data->args.bitmask = server->cache_consistency_bitmask;
  4790. nfs_copy_fh(&data->fh, NFS_FH(inode));
  4791. nfs4_stateid_copy(&data->stateid, stateid);
  4792. data->res.fattr = &data->fattr;
  4793. data->res.server = server;
  4794. nfs_fattr_init(data->res.fattr);
  4795. data->timestamp = jiffies;
  4796. data->rpc_status = 0;
  4797. data->inode = nfs_igrab_and_active(inode);
  4798. if (data->inode)
  4799. data->roc = nfs4_roc(inode);
  4800. task_setup_data.callback_data = data;
  4801. msg.rpc_argp = &data->args;
  4802. msg.rpc_resp = &data->res;
  4803. task = rpc_run_task(&task_setup_data);
  4804. if (IS_ERR(task))
  4805. return PTR_ERR(task);
  4806. if (!issync)
  4807. goto out;
  4808. status = nfs4_wait_for_completion_rpc_task(task);
  4809. if (status != 0)
  4810. goto out;
  4811. status = data->rpc_status;
  4812. if (status == 0)
  4813. nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
  4814. else
  4815. nfs_refresh_inode(inode, &data->fattr);
  4816. out:
  4817. rpc_put_task(task);
  4818. return status;
  4819. }
  4820. int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
  4821. {
  4822. struct nfs_server *server = NFS_SERVER(inode);
  4823. struct nfs4_exception exception = { };
  4824. int err;
  4825. do {
  4826. err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
  4827. trace_nfs4_delegreturn(inode, err);
  4828. switch (err) {
  4829. case -NFS4ERR_STALE_STATEID:
  4830. case -NFS4ERR_EXPIRED:
  4831. case 0:
  4832. return 0;
  4833. }
  4834. err = nfs4_handle_exception(server, err, &exception);
  4835. } while (exception.retry);
  4836. return err;
  4837. }
  4838. #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
  4839. #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
  4840. /*
  4841. * sleep, with exponential backoff, and retry the LOCK operation.
  4842. */
  4843. static unsigned long
  4844. nfs4_set_lock_task_retry(unsigned long timeout)
  4845. {
  4846. freezable_schedule_timeout_killable_unsafe(timeout);
  4847. timeout <<= 1;
  4848. if (timeout > NFS4_LOCK_MAXTIMEOUT)
  4849. return NFS4_LOCK_MAXTIMEOUT;
  4850. return timeout;
  4851. }
  4852. static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
  4853. {
  4854. struct inode *inode = state->inode;
  4855. struct nfs_server *server = NFS_SERVER(inode);
  4856. struct nfs_client *clp = server->nfs_client;
  4857. struct nfs_lockt_args arg = {
  4858. .fh = NFS_FH(inode),
  4859. .fl = request,
  4860. };
  4861. struct nfs_lockt_res res = {
  4862. .denied = request,
  4863. };
  4864. struct rpc_message msg = {
  4865. .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
  4866. .rpc_argp = &arg,
  4867. .rpc_resp = &res,
  4868. .rpc_cred = state->owner->so_cred,
  4869. };
  4870. struct nfs4_lock_state *lsp;
  4871. int status;
  4872. arg.lock_owner.clientid = clp->cl_clientid;
  4873. status = nfs4_set_lock_state(state, request);
  4874. if (status != 0)
  4875. goto out;
  4876. lsp = request->fl_u.nfs4_fl.owner;
  4877. arg.lock_owner.id = lsp->ls_seqid.owner_id;
  4878. arg.lock_owner.s_dev = server->s_dev;
  4879. status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
  4880. switch (status) {
  4881. case 0:
  4882. request->fl_type = F_UNLCK;
  4883. break;
  4884. case -NFS4ERR_DENIED:
  4885. status = 0;
  4886. }
  4887. request->fl_ops->fl_release_private(request);
  4888. request->fl_ops = NULL;
  4889. out:
  4890. return status;
  4891. }
  4892. static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
  4893. {
  4894. struct nfs4_exception exception = { };
  4895. int err;
  4896. do {
  4897. err = _nfs4_proc_getlk(state, cmd, request);
  4898. trace_nfs4_get_lock(request, state, cmd, err);
  4899. err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
  4900. &exception);
  4901. } while (exception.retry);
  4902. return err;
  4903. }
  4904. static int do_vfs_lock(struct inode *inode, struct file_lock *fl)
  4905. {
  4906. int res = 0;
  4907. switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
  4908. case FL_POSIX:
  4909. res = posix_lock_inode_wait(inode, fl);
  4910. break;
  4911. case FL_FLOCK:
  4912. res = flock_lock_inode_wait(inode, fl);
  4913. break;
  4914. default:
  4915. BUG();
  4916. }
  4917. return res;
  4918. }
  4919. struct nfs4_unlockdata {
  4920. struct nfs_locku_args arg;
  4921. struct nfs_locku_res res;
  4922. struct nfs4_lock_state *lsp;
  4923. struct nfs_open_context *ctx;
  4924. struct file_lock fl;
  4925. const struct nfs_server *server;
  4926. unsigned long timestamp;
  4927. };
  4928. static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
  4929. struct nfs_open_context *ctx,
  4930. struct nfs4_lock_state *lsp,
  4931. struct nfs_seqid *seqid)
  4932. {
  4933. struct nfs4_unlockdata *p;
  4934. struct inode *inode = lsp->ls_state->inode;
  4935. p = kzalloc(sizeof(*p), GFP_NOFS);
  4936. if (p == NULL)
  4937. return NULL;
  4938. p->arg.fh = NFS_FH(inode);
  4939. p->arg.fl = &p->fl;
  4940. p->arg.seqid = seqid;
  4941. p->res.seqid = seqid;
  4942. p->lsp = lsp;
  4943. atomic_inc(&lsp->ls_count);
  4944. /* Ensure we don't close file until we're done freeing locks! */
  4945. p->ctx = get_nfs_open_context(ctx);
  4946. memcpy(&p->fl, fl, sizeof(p->fl));
  4947. p->server = NFS_SERVER(inode);
  4948. return p;
  4949. }
  4950. static void nfs4_locku_release_calldata(void *data)
  4951. {
  4952. struct nfs4_unlockdata *calldata = data;
  4953. nfs_free_seqid(calldata->arg.seqid);
  4954. nfs4_put_lock_state(calldata->lsp);
  4955. put_nfs_open_context(calldata->ctx);
  4956. kfree(calldata);
  4957. }
  4958. static void nfs4_locku_done(struct rpc_task *task, void *data)
  4959. {
  4960. struct nfs4_unlockdata *calldata = data;
  4961. if (!nfs4_sequence_done(task, &calldata->res.seq_res))
  4962. return;
  4963. switch (task->tk_status) {
  4964. case 0:
  4965. renew_lease(calldata->server, calldata->timestamp);
  4966. do_vfs_lock(calldata->lsp->ls_state->inode, &calldata->fl);
  4967. if (nfs4_update_lock_stateid(calldata->lsp,
  4968. &calldata->res.stateid))
  4969. break;
  4970. case -NFS4ERR_BAD_STATEID:
  4971. case -NFS4ERR_OLD_STATEID:
  4972. case -NFS4ERR_STALE_STATEID:
  4973. case -NFS4ERR_EXPIRED:
  4974. if (!nfs4_stateid_match(&calldata->arg.stateid,
  4975. &calldata->lsp->ls_stateid))
  4976. rpc_restart_call_prepare(task);
  4977. break;
  4978. default:
  4979. if (nfs4_async_handle_error(task, calldata->server,
  4980. NULL, NULL) == -EAGAIN)
  4981. rpc_restart_call_prepare(task);
  4982. }
  4983. nfs_release_seqid(calldata->arg.seqid);
  4984. }
  4985. static void nfs4_locku_prepare(struct rpc_task *task, void *data)
  4986. {
  4987. struct nfs4_unlockdata *calldata = data;
  4988. if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
  4989. goto out_wait;
  4990. nfs4_stateid_copy(&calldata->arg.stateid, &calldata->lsp->ls_stateid);
  4991. if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
  4992. /* Note: exit _without_ running nfs4_locku_done */
  4993. goto out_no_action;
  4994. }
  4995. calldata->timestamp = jiffies;
  4996. if (nfs4_setup_sequence(calldata->server,
  4997. &calldata->arg.seq_args,
  4998. &calldata->res.seq_res,
  4999. task) != 0)
  5000. nfs_release_seqid(calldata->arg.seqid);
  5001. return;
  5002. out_no_action:
  5003. task->tk_action = NULL;
  5004. out_wait:
  5005. nfs4_sequence_done(task, &calldata->res.seq_res);
  5006. }
  5007. static const struct rpc_call_ops nfs4_locku_ops = {
  5008. .rpc_call_prepare = nfs4_locku_prepare,
  5009. .rpc_call_done = nfs4_locku_done,
  5010. .rpc_release = nfs4_locku_release_calldata,
  5011. };
  5012. static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
  5013. struct nfs_open_context *ctx,
  5014. struct nfs4_lock_state *lsp,
  5015. struct nfs_seqid *seqid)
  5016. {
  5017. struct nfs4_unlockdata *data;
  5018. struct rpc_message msg = {
  5019. .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
  5020. .rpc_cred = ctx->cred,
  5021. };
  5022. struct rpc_task_setup task_setup_data = {
  5023. .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
  5024. .rpc_message = &msg,
  5025. .callback_ops = &nfs4_locku_ops,
  5026. .workqueue = nfsiod_workqueue,
  5027. .flags = RPC_TASK_ASYNC,
  5028. };
  5029. nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
  5030. NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
  5031. /* Ensure this is an unlock - when canceling a lock, the
  5032. * canceled lock is passed in, and it won't be an unlock.
  5033. */
  5034. fl->fl_type = F_UNLCK;
  5035. data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
  5036. if (data == NULL) {
  5037. nfs_free_seqid(seqid);
  5038. return ERR_PTR(-ENOMEM);
  5039. }
  5040. nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
  5041. msg.rpc_argp = &data->arg;
  5042. msg.rpc_resp = &data->res;
  5043. task_setup_data.callback_data = data;
  5044. return rpc_run_task(&task_setup_data);
  5045. }
  5046. static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
  5047. {
  5048. struct inode *inode = state->inode;
  5049. struct nfs4_state_owner *sp = state->owner;
  5050. struct nfs_inode *nfsi = NFS_I(inode);
  5051. struct nfs_seqid *seqid;
  5052. struct nfs4_lock_state *lsp;
  5053. struct rpc_task *task;
  5054. struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
  5055. int status = 0;
  5056. unsigned char fl_flags = request->fl_flags;
  5057. status = nfs4_set_lock_state(state, request);
  5058. /* Unlock _before_ we do the RPC call */
  5059. request->fl_flags |= FL_EXISTS;
  5060. /* Exclude nfs_delegation_claim_locks() */
  5061. mutex_lock(&sp->so_delegreturn_mutex);
  5062. /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
  5063. down_read(&nfsi->rwsem);
  5064. if (do_vfs_lock(inode, request) == -ENOENT) {
  5065. up_read(&nfsi->rwsem);
  5066. mutex_unlock(&sp->so_delegreturn_mutex);
  5067. goto out;
  5068. }
  5069. up_read(&nfsi->rwsem);
  5070. mutex_unlock(&sp->so_delegreturn_mutex);
  5071. if (status != 0)
  5072. goto out;
  5073. /* Is this a delegated lock? */
  5074. lsp = request->fl_u.nfs4_fl.owner;
  5075. if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
  5076. goto out;
  5077. alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid;
  5078. seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
  5079. status = -ENOMEM;
  5080. if (IS_ERR(seqid))
  5081. goto out;
  5082. task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
  5083. status = PTR_ERR(task);
  5084. if (IS_ERR(task))
  5085. goto out;
  5086. status = nfs4_wait_for_completion_rpc_task(task);
  5087. rpc_put_task(task);
  5088. out:
  5089. request->fl_flags = fl_flags;
  5090. trace_nfs4_unlock(request, state, F_SETLK, status);
  5091. return status;
  5092. }
  5093. struct nfs4_lockdata {
  5094. struct nfs_lock_args arg;
  5095. struct nfs_lock_res res;
  5096. struct nfs4_lock_state *lsp;
  5097. struct nfs_open_context *ctx;
  5098. struct file_lock fl;
  5099. unsigned long timestamp;
  5100. int rpc_status;
  5101. int cancelled;
  5102. struct nfs_server *server;
  5103. };
  5104. static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
  5105. struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
  5106. gfp_t gfp_mask)
  5107. {
  5108. struct nfs4_lockdata *p;
  5109. struct inode *inode = lsp->ls_state->inode;
  5110. struct nfs_server *server = NFS_SERVER(inode);
  5111. struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
  5112. p = kzalloc(sizeof(*p), gfp_mask);
  5113. if (p == NULL)
  5114. return NULL;
  5115. p->arg.fh = NFS_FH(inode);
  5116. p->arg.fl = &p->fl;
  5117. p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
  5118. if (IS_ERR(p->arg.open_seqid))
  5119. goto out_free;
  5120. alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
  5121. p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask);
  5122. if (IS_ERR(p->arg.lock_seqid))
  5123. goto out_free_seqid;
  5124. p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
  5125. p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
  5126. p->arg.lock_owner.s_dev = server->s_dev;
  5127. p->res.lock_seqid = p->arg.lock_seqid;
  5128. p->lsp = lsp;
  5129. p->server = server;
  5130. atomic_inc(&lsp->ls_count);
  5131. p->ctx = get_nfs_open_context(ctx);
  5132. get_file(fl->fl_file);
  5133. memcpy(&p->fl, fl, sizeof(p->fl));
  5134. return p;
  5135. out_free_seqid:
  5136. nfs_free_seqid(p->arg.open_seqid);
  5137. out_free:
  5138. kfree(p);
  5139. return NULL;
  5140. }
  5141. static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
  5142. {
  5143. struct nfs4_lockdata *data = calldata;
  5144. struct nfs4_state *state = data->lsp->ls_state;
  5145. dprintk("%s: begin!\n", __func__);
  5146. if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
  5147. goto out_wait;
  5148. /* Do we need to do an open_to_lock_owner? */
  5149. if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) {
  5150. if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
  5151. goto out_release_lock_seqid;
  5152. }
  5153. nfs4_stateid_copy(&data->arg.open_stateid,
  5154. &state->open_stateid);
  5155. data->arg.new_lock_owner = 1;
  5156. data->res.open_seqid = data->arg.open_seqid;
  5157. } else {
  5158. data->arg.new_lock_owner = 0;
  5159. nfs4_stateid_copy(&data->arg.lock_stateid,
  5160. &data->lsp->ls_stateid);
  5161. }
  5162. if (!nfs4_valid_open_stateid(state)) {
  5163. data->rpc_status = -EBADF;
  5164. task->tk_action = NULL;
  5165. goto out_release_open_seqid;
  5166. }
  5167. data->timestamp = jiffies;
  5168. if (nfs4_setup_sequence(data->server,
  5169. &data->arg.seq_args,
  5170. &data->res.seq_res,
  5171. task) == 0)
  5172. return;
  5173. out_release_open_seqid:
  5174. nfs_release_seqid(data->arg.open_seqid);
  5175. out_release_lock_seqid:
  5176. nfs_release_seqid(data->arg.lock_seqid);
  5177. out_wait:
  5178. nfs4_sequence_done(task, &data->res.seq_res);
  5179. dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
  5180. }
  5181. static void nfs4_lock_done(struct rpc_task *task, void *calldata)
  5182. {
  5183. struct nfs4_lockdata *data = calldata;
  5184. struct nfs4_lock_state *lsp = data->lsp;
  5185. dprintk("%s: begin!\n", __func__);
  5186. if (!nfs4_sequence_done(task, &data->res.seq_res))
  5187. return;
  5188. data->rpc_status = task->tk_status;
  5189. switch (task->tk_status) {
  5190. case 0:
  5191. renew_lease(NFS_SERVER(d_inode(data->ctx->dentry)),
  5192. data->timestamp);
  5193. if (data->arg.new_lock) {
  5194. data->fl.fl_flags &= ~(FL_SLEEP | FL_ACCESS);
  5195. if (do_vfs_lock(lsp->ls_state->inode, &data->fl) < 0) {
  5196. rpc_restart_call_prepare(task);
  5197. break;
  5198. }
  5199. }
  5200. if (data->arg.new_lock_owner != 0) {
  5201. nfs_confirm_seqid(&lsp->ls_seqid, 0);
  5202. nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid);
  5203. set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
  5204. } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid))
  5205. rpc_restart_call_prepare(task);
  5206. break;
  5207. case -NFS4ERR_BAD_STATEID:
  5208. case -NFS4ERR_OLD_STATEID:
  5209. case -NFS4ERR_STALE_STATEID:
  5210. case -NFS4ERR_EXPIRED:
  5211. if (data->arg.new_lock_owner != 0) {
  5212. if (!nfs4_stateid_match(&data->arg.open_stateid,
  5213. &lsp->ls_state->open_stateid))
  5214. rpc_restart_call_prepare(task);
  5215. } else if (!nfs4_stateid_match(&data->arg.lock_stateid,
  5216. &lsp->ls_stateid))
  5217. rpc_restart_call_prepare(task);
  5218. }
  5219. dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
  5220. }
  5221. static void nfs4_lock_release(void *calldata)
  5222. {
  5223. struct nfs4_lockdata *data = calldata;
  5224. dprintk("%s: begin!\n", __func__);
  5225. nfs_free_seqid(data->arg.open_seqid);
  5226. if (data->cancelled != 0) {
  5227. struct rpc_task *task;
  5228. task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
  5229. data->arg.lock_seqid);
  5230. if (!IS_ERR(task))
  5231. rpc_put_task_async(task);
  5232. dprintk("%s: cancelling lock!\n", __func__);
  5233. } else
  5234. nfs_free_seqid(data->arg.lock_seqid);
  5235. nfs4_put_lock_state(data->lsp);
  5236. put_nfs_open_context(data->ctx);
  5237. fput(data->fl.fl_file);
  5238. kfree(data);
  5239. dprintk("%s: done!\n", __func__);
  5240. }
  5241. static const struct rpc_call_ops nfs4_lock_ops = {
  5242. .rpc_call_prepare = nfs4_lock_prepare,
  5243. .rpc_call_done = nfs4_lock_done,
  5244. .rpc_release = nfs4_lock_release,
  5245. };
  5246. static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
  5247. {
  5248. switch (error) {
  5249. case -NFS4ERR_ADMIN_REVOKED:
  5250. case -NFS4ERR_BAD_STATEID:
  5251. lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
  5252. if (new_lock_owner != 0 ||
  5253. test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
  5254. nfs4_schedule_stateid_recovery(server, lsp->ls_state);
  5255. break;
  5256. case -NFS4ERR_STALE_STATEID:
  5257. lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
  5258. case -NFS4ERR_EXPIRED:
  5259. nfs4_schedule_lease_recovery(server->nfs_client);
  5260. };
  5261. }
  5262. static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
  5263. {
  5264. struct nfs4_lockdata *data;
  5265. struct rpc_task *task;
  5266. struct rpc_message msg = {
  5267. .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
  5268. .rpc_cred = state->owner->so_cred,
  5269. };
  5270. struct rpc_task_setup task_setup_data = {
  5271. .rpc_client = NFS_CLIENT(state->inode),
  5272. .rpc_message = &msg,
  5273. .callback_ops = &nfs4_lock_ops,
  5274. .workqueue = nfsiod_workqueue,
  5275. .flags = RPC_TASK_ASYNC,
  5276. };
  5277. int ret;
  5278. dprintk("%s: begin!\n", __func__);
  5279. data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
  5280. fl->fl_u.nfs4_fl.owner,
  5281. recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
  5282. if (data == NULL)
  5283. return -ENOMEM;
  5284. if (IS_SETLKW(cmd))
  5285. data->arg.block = 1;
  5286. nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
  5287. msg.rpc_argp = &data->arg;
  5288. msg.rpc_resp = &data->res;
  5289. task_setup_data.callback_data = data;
  5290. if (recovery_type > NFS_LOCK_NEW) {
  5291. if (recovery_type == NFS_LOCK_RECLAIM)
  5292. data->arg.reclaim = NFS_LOCK_RECLAIM;
  5293. nfs4_set_sequence_privileged(&data->arg.seq_args);
  5294. } else
  5295. data->arg.new_lock = 1;
  5296. task = rpc_run_task(&task_setup_data);
  5297. if (IS_ERR(task))
  5298. return PTR_ERR(task);
  5299. ret = nfs4_wait_for_completion_rpc_task(task);
  5300. if (ret == 0) {
  5301. ret = data->rpc_status;
  5302. if (ret)
  5303. nfs4_handle_setlk_error(data->server, data->lsp,
  5304. data->arg.new_lock_owner, ret);
  5305. } else
  5306. data->cancelled = 1;
  5307. rpc_put_task(task);
  5308. dprintk("%s: done, ret = %d!\n", __func__, ret);
  5309. return ret;
  5310. }
  5311. static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
  5312. {
  5313. struct nfs_server *server = NFS_SERVER(state->inode);
  5314. struct nfs4_exception exception = {
  5315. .inode = state->inode,
  5316. };
  5317. int err;
  5318. do {
  5319. /* Cache the lock if possible... */
  5320. if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
  5321. return 0;
  5322. err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
  5323. trace_nfs4_lock_reclaim(request, state, F_SETLK, err);
  5324. if (err != -NFS4ERR_DELAY)
  5325. break;
  5326. nfs4_handle_exception(server, err, &exception);
  5327. } while (exception.retry);
  5328. return err;
  5329. }
  5330. static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
  5331. {
  5332. struct nfs_server *server = NFS_SERVER(state->inode);
  5333. struct nfs4_exception exception = {
  5334. .inode = state->inode,
  5335. };
  5336. int err;
  5337. err = nfs4_set_lock_state(state, request);
  5338. if (err != 0)
  5339. return err;
  5340. if (!recover_lost_locks) {
  5341. set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
  5342. return 0;
  5343. }
  5344. do {
  5345. if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
  5346. return 0;
  5347. err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
  5348. trace_nfs4_lock_expired(request, state, F_SETLK, err);
  5349. switch (err) {
  5350. default:
  5351. goto out;
  5352. case -NFS4ERR_GRACE:
  5353. case -NFS4ERR_DELAY:
  5354. nfs4_handle_exception(server, err, &exception);
  5355. err = 0;
  5356. }
  5357. } while (exception.retry);
  5358. out:
  5359. return err;
  5360. }
  5361. #if defined(CONFIG_NFS_V4_1)
  5362. /**
  5363. * nfs41_check_expired_locks - possibly free a lock stateid
  5364. *
  5365. * @state: NFSv4 state for an inode
  5366. *
  5367. * Returns NFS_OK if recovery for this stateid is now finished.
  5368. * Otherwise a negative NFS4ERR value is returned.
  5369. */
  5370. static int nfs41_check_expired_locks(struct nfs4_state *state)
  5371. {
  5372. int status, ret = -NFS4ERR_BAD_STATEID;
  5373. struct nfs4_lock_state *lsp;
  5374. struct nfs_server *server = NFS_SERVER(state->inode);
  5375. list_for_each_entry(lsp, &state->lock_states, ls_locks) {
  5376. if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
  5377. struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
  5378. status = nfs41_test_stateid(server,
  5379. &lsp->ls_stateid,
  5380. cred);
  5381. trace_nfs4_test_lock_stateid(state, lsp, status);
  5382. if (status != NFS_OK) {
  5383. /* Free the stateid unless the server
  5384. * informs us the stateid is unrecognized. */
  5385. if (status != -NFS4ERR_BAD_STATEID)
  5386. nfs41_free_stateid(server,
  5387. &lsp->ls_stateid,
  5388. cred);
  5389. clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
  5390. ret = status;
  5391. }
  5392. }
  5393. };
  5394. return ret;
  5395. }
  5396. static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
  5397. {
  5398. int status = NFS_OK;
  5399. if (test_bit(LK_STATE_IN_USE, &state->flags))
  5400. status = nfs41_check_expired_locks(state);
  5401. if (status != NFS_OK)
  5402. status = nfs4_lock_expired(state, request);
  5403. return status;
  5404. }
  5405. #endif
  5406. static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
  5407. {
  5408. struct nfs_inode *nfsi = NFS_I(state->inode);
  5409. unsigned char fl_flags = request->fl_flags;
  5410. int status = -ENOLCK;
  5411. if ((fl_flags & FL_POSIX) &&
  5412. !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
  5413. goto out;
  5414. /* Is this a delegated open? */
  5415. status = nfs4_set_lock_state(state, request);
  5416. if (status != 0)
  5417. goto out;
  5418. request->fl_flags |= FL_ACCESS;
  5419. status = do_vfs_lock(state->inode, request);
  5420. if (status < 0)
  5421. goto out;
  5422. down_read(&nfsi->rwsem);
  5423. if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
  5424. /* Yes: cache locks! */
  5425. /* ...but avoid races with delegation recall... */
  5426. request->fl_flags = fl_flags & ~FL_SLEEP;
  5427. status = do_vfs_lock(state->inode, request);
  5428. up_read(&nfsi->rwsem);
  5429. goto out;
  5430. }
  5431. up_read(&nfsi->rwsem);
  5432. status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
  5433. out:
  5434. request->fl_flags = fl_flags;
  5435. return status;
  5436. }
  5437. static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
  5438. {
  5439. struct nfs4_exception exception = {
  5440. .state = state,
  5441. .inode = state->inode,
  5442. };
  5443. int err;
  5444. do {
  5445. err = _nfs4_proc_setlk(state, cmd, request);
  5446. trace_nfs4_set_lock(request, state, cmd, err);
  5447. if (err == -NFS4ERR_DENIED)
  5448. err = -EAGAIN;
  5449. err = nfs4_handle_exception(NFS_SERVER(state->inode),
  5450. err, &exception);
  5451. } while (exception.retry);
  5452. return err;
  5453. }
  5454. static int
  5455. nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
  5456. {
  5457. struct nfs_open_context *ctx;
  5458. struct nfs4_state *state;
  5459. unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
  5460. int status;
  5461. /* verify open state */
  5462. ctx = nfs_file_open_context(filp);
  5463. state = ctx->state;
  5464. if (request->fl_start < 0 || request->fl_end < 0)
  5465. return -EINVAL;
  5466. if (IS_GETLK(cmd)) {
  5467. if (state != NULL)
  5468. return nfs4_proc_getlk(state, F_GETLK, request);
  5469. return 0;
  5470. }
  5471. if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
  5472. return -EINVAL;
  5473. if (request->fl_type == F_UNLCK) {
  5474. if (state != NULL)
  5475. return nfs4_proc_unlck(state, cmd, request);
  5476. return 0;
  5477. }
  5478. if (state == NULL)
  5479. return -ENOLCK;
  5480. /*
  5481. * Don't rely on the VFS having checked the file open mode,
  5482. * since it won't do this for flock() locks.
  5483. */
  5484. switch (request->fl_type) {
  5485. case F_RDLCK:
  5486. if (!(filp->f_mode & FMODE_READ))
  5487. return -EBADF;
  5488. break;
  5489. case F_WRLCK:
  5490. if (!(filp->f_mode & FMODE_WRITE))
  5491. return -EBADF;
  5492. }
  5493. do {
  5494. status = nfs4_proc_setlk(state, cmd, request);
  5495. if ((status != -EAGAIN) || IS_SETLK(cmd))
  5496. break;
  5497. timeout = nfs4_set_lock_task_retry(timeout);
  5498. status = -ERESTARTSYS;
  5499. if (signalled())
  5500. break;
  5501. } while(status < 0);
  5502. return status;
  5503. }
  5504. int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
  5505. {
  5506. struct nfs_server *server = NFS_SERVER(state->inode);
  5507. int err;
  5508. err = nfs4_set_lock_state(state, fl);
  5509. if (err != 0)
  5510. return err;
  5511. err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
  5512. return nfs4_handle_delegation_recall_error(server, state, stateid, err);
  5513. }
  5514. struct nfs_release_lockowner_data {
  5515. struct nfs4_lock_state *lsp;
  5516. struct nfs_server *server;
  5517. struct nfs_release_lockowner_args args;
  5518. struct nfs_release_lockowner_res res;
  5519. unsigned long timestamp;
  5520. };
  5521. static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
  5522. {
  5523. struct nfs_release_lockowner_data *data = calldata;
  5524. struct nfs_server *server = data->server;
  5525. nfs40_setup_sequence(server->nfs_client->cl_slot_tbl,
  5526. &data->args.seq_args, &data->res.seq_res, task);
  5527. data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
  5528. data->timestamp = jiffies;
  5529. }
  5530. static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
  5531. {
  5532. struct nfs_release_lockowner_data *data = calldata;
  5533. struct nfs_server *server = data->server;
  5534. nfs40_sequence_done(task, &data->res.seq_res);
  5535. switch (task->tk_status) {
  5536. case 0:
  5537. renew_lease(server, data->timestamp);
  5538. break;
  5539. case -NFS4ERR_STALE_CLIENTID:
  5540. case -NFS4ERR_EXPIRED:
  5541. nfs4_schedule_lease_recovery(server->nfs_client);
  5542. break;
  5543. case -NFS4ERR_LEASE_MOVED:
  5544. case -NFS4ERR_DELAY:
  5545. if (nfs4_async_handle_error(task, server,
  5546. NULL, NULL) == -EAGAIN)
  5547. rpc_restart_call_prepare(task);
  5548. }
  5549. }
  5550. static void nfs4_release_lockowner_release(void *calldata)
  5551. {
  5552. struct nfs_release_lockowner_data *data = calldata;
  5553. nfs4_free_lock_state(data->server, data->lsp);
  5554. kfree(calldata);
  5555. }
  5556. static const struct rpc_call_ops nfs4_release_lockowner_ops = {
  5557. .rpc_call_prepare = nfs4_release_lockowner_prepare,
  5558. .rpc_call_done = nfs4_release_lockowner_done,
  5559. .rpc_release = nfs4_release_lockowner_release,
  5560. };
  5561. static void
  5562. nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
  5563. {
  5564. struct nfs_release_lockowner_data *data;
  5565. struct rpc_message msg = {
  5566. .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
  5567. };
  5568. if (server->nfs_client->cl_mvops->minor_version != 0)
  5569. return;
  5570. data = kmalloc(sizeof(*data), GFP_NOFS);
  5571. if (!data)
  5572. return;
  5573. data->lsp = lsp;
  5574. data->server = server;
  5575. data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
  5576. data->args.lock_owner.id = lsp->ls_seqid.owner_id;
  5577. data->args.lock_owner.s_dev = server->s_dev;
  5578. msg.rpc_argp = &data->args;
  5579. msg.rpc_resp = &data->res;
  5580. nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
  5581. rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
  5582. }
  5583. #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
  5584. static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
  5585. const void *buf, size_t buflen,
  5586. int flags, int type)
  5587. {
  5588. if (strcmp(key, "") != 0)
  5589. return -EINVAL;
  5590. return nfs4_proc_set_acl(d_inode(dentry), buf, buflen);
  5591. }
  5592. static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
  5593. void *buf, size_t buflen, int type)
  5594. {
  5595. if (strcmp(key, "") != 0)
  5596. return -EINVAL;
  5597. return nfs4_proc_get_acl(d_inode(dentry), buf, buflen);
  5598. }
  5599. static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
  5600. size_t list_len, const char *name,
  5601. size_t name_len, int type)
  5602. {
  5603. size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
  5604. if (!nfs4_server_supports_acls(NFS_SERVER(d_inode(dentry))))
  5605. return 0;
  5606. if (list && len <= list_len)
  5607. memcpy(list, XATTR_NAME_NFSV4_ACL, len);
  5608. return len;
  5609. }
  5610. #ifdef CONFIG_NFS_V4_SECURITY_LABEL
  5611. static inline int nfs4_server_supports_labels(struct nfs_server *server)
  5612. {
  5613. return server->caps & NFS_CAP_SECURITY_LABEL;
  5614. }
  5615. static int nfs4_xattr_set_nfs4_label(struct dentry *dentry, const char *key,
  5616. const void *buf, size_t buflen,
  5617. int flags, int type)
  5618. {
  5619. if (security_ismaclabel(key))
  5620. return nfs4_set_security_label(dentry, buf, buflen);
  5621. return -EOPNOTSUPP;
  5622. }
  5623. static int nfs4_xattr_get_nfs4_label(struct dentry *dentry, const char *key,
  5624. void *buf, size_t buflen, int type)
  5625. {
  5626. if (security_ismaclabel(key))
  5627. return nfs4_get_security_label(d_inode(dentry), buf, buflen);
  5628. return -EOPNOTSUPP;
  5629. }
  5630. static size_t nfs4_xattr_list_nfs4_label(struct dentry *dentry, char *list,
  5631. size_t list_len, const char *name,
  5632. size_t name_len, int type)
  5633. {
  5634. size_t len = 0;
  5635. if (nfs_server_capable(d_inode(dentry), NFS_CAP_SECURITY_LABEL)) {
  5636. len = security_inode_listsecurity(d_inode(dentry), NULL, 0);
  5637. if (list && len <= list_len)
  5638. security_inode_listsecurity(d_inode(dentry), list, len);
  5639. }
  5640. return len;
  5641. }
  5642. static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
  5643. .prefix = XATTR_SECURITY_PREFIX,
  5644. .list = nfs4_xattr_list_nfs4_label,
  5645. .get = nfs4_xattr_get_nfs4_label,
  5646. .set = nfs4_xattr_set_nfs4_label,
  5647. };
  5648. #endif
  5649. /*
  5650. * nfs_fhget will use either the mounted_on_fileid or the fileid
  5651. */
  5652. static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
  5653. {
  5654. if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
  5655. (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
  5656. (fattr->valid & NFS_ATTR_FATTR_FSID) &&
  5657. (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
  5658. return;
  5659. fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
  5660. NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
  5661. fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
  5662. fattr->nlink = 2;
  5663. }
  5664. static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
  5665. const struct qstr *name,
  5666. struct nfs4_fs_locations *fs_locations,
  5667. struct page *page)
  5668. {
  5669. struct nfs_server *server = NFS_SERVER(dir);
  5670. u32 bitmask[3] = {
  5671. [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
  5672. };
  5673. struct nfs4_fs_locations_arg args = {
  5674. .dir_fh = NFS_FH(dir),
  5675. .name = name,
  5676. .page = page,
  5677. .bitmask = bitmask,
  5678. };
  5679. struct nfs4_fs_locations_res res = {
  5680. .fs_locations = fs_locations,
  5681. };
  5682. struct rpc_message msg = {
  5683. .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
  5684. .rpc_argp = &args,
  5685. .rpc_resp = &res,
  5686. };
  5687. int status;
  5688. dprintk("%s: start\n", __func__);
  5689. /* Ask for the fileid of the absent filesystem if mounted_on_fileid
  5690. * is not supported */
  5691. if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
  5692. bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
  5693. else
  5694. bitmask[0] |= FATTR4_WORD0_FILEID;
  5695. nfs_fattr_init(&fs_locations->fattr);
  5696. fs_locations->server = server;
  5697. fs_locations->nlocations = 0;
  5698. status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
  5699. dprintk("%s: returned status = %d\n", __func__, status);
  5700. return status;
  5701. }
  5702. int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
  5703. const struct qstr *name,
  5704. struct nfs4_fs_locations *fs_locations,
  5705. struct page *page)
  5706. {
  5707. struct nfs4_exception exception = { };
  5708. int err;
  5709. do {
  5710. err = _nfs4_proc_fs_locations(client, dir, name,
  5711. fs_locations, page);
  5712. trace_nfs4_get_fs_locations(dir, name, err);
  5713. err = nfs4_handle_exception(NFS_SERVER(dir), err,
  5714. &exception);
  5715. } while (exception.retry);
  5716. return err;
  5717. }
  5718. /*
  5719. * This operation also signals the server that this client is
  5720. * performing migration recovery. The server can stop returning
  5721. * NFS4ERR_LEASE_MOVED to this client. A RENEW operation is
  5722. * appended to this compound to identify the client ID which is
  5723. * performing recovery.
  5724. */
  5725. static int _nfs40_proc_get_locations(struct inode *inode,
  5726. struct nfs4_fs_locations *locations,
  5727. struct page *page, struct rpc_cred *cred)
  5728. {
  5729. struct nfs_server *server = NFS_SERVER(inode);
  5730. struct rpc_clnt *clnt = server->client;
  5731. u32 bitmask[2] = {
  5732. [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
  5733. };
  5734. struct nfs4_fs_locations_arg args = {
  5735. .clientid = server->nfs_client->cl_clientid,
  5736. .fh = NFS_FH(inode),
  5737. .page = page,
  5738. .bitmask = bitmask,
  5739. .migration = 1, /* skip LOOKUP */
  5740. .renew = 1, /* append RENEW */
  5741. };
  5742. struct nfs4_fs_locations_res res = {
  5743. .fs_locations = locations,
  5744. .migration = 1,
  5745. .renew = 1,
  5746. };
  5747. struct rpc_message msg = {
  5748. .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
  5749. .rpc_argp = &args,
  5750. .rpc_resp = &res,
  5751. .rpc_cred = cred,
  5752. };
  5753. unsigned long now = jiffies;
  5754. int status;
  5755. nfs_fattr_init(&locations->fattr);
  5756. locations->server = server;
  5757. locations->nlocations = 0;
  5758. nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
  5759. nfs4_set_sequence_privileged(&args.seq_args);
  5760. status = nfs4_call_sync_sequence(clnt, server, &msg,
  5761. &args.seq_args, &res.seq_res);
  5762. if (status)
  5763. return status;
  5764. renew_lease(server, now);
  5765. return 0;
  5766. }
  5767. #ifdef CONFIG_NFS_V4_1
  5768. /*
  5769. * This operation also signals the server that this client is
  5770. * performing migration recovery. The server can stop asserting
  5771. * SEQ4_STATUS_LEASE_MOVED for this client. The client ID
  5772. * performing this operation is identified in the SEQUENCE
  5773. * operation in this compound.
  5774. *
  5775. * When the client supports GETATTR(fs_locations_info), it can
  5776. * be plumbed in here.
  5777. */
  5778. static int _nfs41_proc_get_locations(struct inode *inode,
  5779. struct nfs4_fs_locations *locations,
  5780. struct page *page, struct rpc_cred *cred)
  5781. {
  5782. struct nfs_server *server = NFS_SERVER(inode);
  5783. struct rpc_clnt *clnt = server->client;
  5784. u32 bitmask[2] = {
  5785. [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
  5786. };
  5787. struct nfs4_fs_locations_arg args = {
  5788. .fh = NFS_FH(inode),
  5789. .page = page,
  5790. .bitmask = bitmask,
  5791. .migration = 1, /* skip LOOKUP */
  5792. };
  5793. struct nfs4_fs_locations_res res = {
  5794. .fs_locations = locations,
  5795. .migration = 1,
  5796. };
  5797. struct rpc_message msg = {
  5798. .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
  5799. .rpc_argp = &args,
  5800. .rpc_resp = &res,
  5801. .rpc_cred = cred,
  5802. };
  5803. int status;
  5804. nfs_fattr_init(&locations->fattr);
  5805. locations->server = server;
  5806. locations->nlocations = 0;
  5807. nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
  5808. nfs4_set_sequence_privileged(&args.seq_args);
  5809. status = nfs4_call_sync_sequence(clnt, server, &msg,
  5810. &args.seq_args, &res.seq_res);
  5811. if (status == NFS4_OK &&
  5812. res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
  5813. status = -NFS4ERR_LEASE_MOVED;
  5814. return status;
  5815. }
  5816. #endif /* CONFIG_NFS_V4_1 */
  5817. /**
  5818. * nfs4_proc_get_locations - discover locations for a migrated FSID
  5819. * @inode: inode on FSID that is migrating
  5820. * @locations: result of query
  5821. * @page: buffer
  5822. * @cred: credential to use for this operation
  5823. *
  5824. * Returns NFS4_OK on success, a negative NFS4ERR status code if the
  5825. * operation failed, or a negative errno if a local error occurred.
  5826. *
  5827. * On success, "locations" is filled in, but if the server has
  5828. * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
  5829. * asserted.
  5830. *
  5831. * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
  5832. * from this client that require migration recovery.
  5833. */
  5834. int nfs4_proc_get_locations(struct inode *inode,
  5835. struct nfs4_fs_locations *locations,
  5836. struct page *page, struct rpc_cred *cred)
  5837. {
  5838. struct nfs_server *server = NFS_SERVER(inode);
  5839. struct nfs_client *clp = server->nfs_client;
  5840. const struct nfs4_mig_recovery_ops *ops =
  5841. clp->cl_mvops->mig_recovery_ops;
  5842. struct nfs4_exception exception = { };
  5843. int status;
  5844. dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
  5845. (unsigned long long)server->fsid.major,
  5846. (unsigned long long)server->fsid.minor,
  5847. clp->cl_hostname);
  5848. nfs_display_fhandle(NFS_FH(inode), __func__);
  5849. do {
  5850. status = ops->get_locations(inode, locations, page, cred);
  5851. if (status != -NFS4ERR_DELAY)
  5852. break;
  5853. nfs4_handle_exception(server, status, &exception);
  5854. } while (exception.retry);
  5855. return status;
  5856. }
  5857. /*
  5858. * This operation also signals the server that this client is
  5859. * performing "lease moved" recovery. The server can stop
  5860. * returning NFS4ERR_LEASE_MOVED to this client. A RENEW operation
  5861. * is appended to this compound to identify the client ID which is
  5862. * performing recovery.
  5863. */
  5864. static int _nfs40_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
  5865. {
  5866. struct nfs_server *server = NFS_SERVER(inode);
  5867. struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
  5868. struct rpc_clnt *clnt = server->client;
  5869. struct nfs4_fsid_present_arg args = {
  5870. .fh = NFS_FH(inode),
  5871. .clientid = clp->cl_clientid,
  5872. .renew = 1, /* append RENEW */
  5873. };
  5874. struct nfs4_fsid_present_res res = {
  5875. .renew = 1,
  5876. };
  5877. struct rpc_message msg = {
  5878. .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
  5879. .rpc_argp = &args,
  5880. .rpc_resp = &res,
  5881. .rpc_cred = cred,
  5882. };
  5883. unsigned long now = jiffies;
  5884. int status;
  5885. res.fh = nfs_alloc_fhandle();
  5886. if (res.fh == NULL)
  5887. return -ENOMEM;
  5888. nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
  5889. nfs4_set_sequence_privileged(&args.seq_args);
  5890. status = nfs4_call_sync_sequence(clnt, server, &msg,
  5891. &args.seq_args, &res.seq_res);
  5892. nfs_free_fhandle(res.fh);
  5893. if (status)
  5894. return status;
  5895. do_renew_lease(clp, now);
  5896. return 0;
  5897. }
  5898. #ifdef CONFIG_NFS_V4_1
  5899. /*
  5900. * This operation also signals the server that this client is
  5901. * performing "lease moved" recovery. The server can stop asserting
  5902. * SEQ4_STATUS_LEASE_MOVED for this client. The client ID performing
  5903. * this operation is identified in the SEQUENCE operation in this
  5904. * compound.
  5905. */
  5906. static int _nfs41_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
  5907. {
  5908. struct nfs_server *server = NFS_SERVER(inode);
  5909. struct rpc_clnt *clnt = server->client;
  5910. struct nfs4_fsid_present_arg args = {
  5911. .fh = NFS_FH(inode),
  5912. };
  5913. struct nfs4_fsid_present_res res = {
  5914. };
  5915. struct rpc_message msg = {
  5916. .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
  5917. .rpc_argp = &args,
  5918. .rpc_resp = &res,
  5919. .rpc_cred = cred,
  5920. };
  5921. int status;
  5922. res.fh = nfs_alloc_fhandle();
  5923. if (res.fh == NULL)
  5924. return -ENOMEM;
  5925. nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
  5926. nfs4_set_sequence_privileged(&args.seq_args);
  5927. status = nfs4_call_sync_sequence(clnt, server, &msg,
  5928. &args.seq_args, &res.seq_res);
  5929. nfs_free_fhandle(res.fh);
  5930. if (status == NFS4_OK &&
  5931. res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
  5932. status = -NFS4ERR_LEASE_MOVED;
  5933. return status;
  5934. }
  5935. #endif /* CONFIG_NFS_V4_1 */
  5936. /**
  5937. * nfs4_proc_fsid_present - Is this FSID present or absent on server?
  5938. * @inode: inode on FSID to check
  5939. * @cred: credential to use for this operation
  5940. *
  5941. * Server indicates whether the FSID is present, moved, or not
  5942. * recognized. This operation is necessary to clear a LEASE_MOVED
  5943. * condition for this client ID.
  5944. *
  5945. * Returns NFS4_OK if the FSID is present on this server,
  5946. * -NFS4ERR_MOVED if the FSID is no longer present, a negative
  5947. * NFS4ERR code if some error occurred on the server, or a
  5948. * negative errno if a local failure occurred.
  5949. */
  5950. int nfs4_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
  5951. {
  5952. struct nfs_server *server = NFS_SERVER(inode);
  5953. struct nfs_client *clp = server->nfs_client;
  5954. const struct nfs4_mig_recovery_ops *ops =
  5955. clp->cl_mvops->mig_recovery_ops;
  5956. struct nfs4_exception exception = { };
  5957. int status;
  5958. dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
  5959. (unsigned long long)server->fsid.major,
  5960. (unsigned long long)server->fsid.minor,
  5961. clp->cl_hostname);
  5962. nfs_display_fhandle(NFS_FH(inode), __func__);
  5963. do {
  5964. status = ops->fsid_present(inode, cred);
  5965. if (status != -NFS4ERR_DELAY)
  5966. break;
  5967. nfs4_handle_exception(server, status, &exception);
  5968. } while (exception.retry);
  5969. return status;
  5970. }
  5971. /**
  5972. * If 'use_integrity' is true and the state managment nfs_client
  5973. * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
  5974. * and the machine credential as per RFC3530bis and RFC5661 Security
  5975. * Considerations sections. Otherwise, just use the user cred with the
  5976. * filesystem's rpc_client.
  5977. */
  5978. static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
  5979. {
  5980. int status;
  5981. struct nfs4_secinfo_arg args = {
  5982. .dir_fh = NFS_FH(dir),
  5983. .name = name,
  5984. };
  5985. struct nfs4_secinfo_res res = {
  5986. .flavors = flavors,
  5987. };
  5988. struct rpc_message msg = {
  5989. .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
  5990. .rpc_argp = &args,
  5991. .rpc_resp = &res,
  5992. };
  5993. struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
  5994. struct rpc_cred *cred = NULL;
  5995. if (use_integrity) {
  5996. clnt = NFS_SERVER(dir)->nfs_client->cl_rpcclient;
  5997. cred = nfs4_get_clid_cred(NFS_SERVER(dir)->nfs_client);
  5998. msg.rpc_cred = cred;
  5999. }
  6000. dprintk("NFS call secinfo %s\n", name->name);
  6001. nfs4_state_protect(NFS_SERVER(dir)->nfs_client,
  6002. NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
  6003. status = nfs4_call_sync(clnt, NFS_SERVER(dir), &msg, &args.seq_args,
  6004. &res.seq_res, 0);
  6005. dprintk("NFS reply secinfo: %d\n", status);
  6006. if (cred)
  6007. put_rpccred(cred);
  6008. return status;
  6009. }
  6010. int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
  6011. struct nfs4_secinfo_flavors *flavors)
  6012. {
  6013. struct nfs4_exception exception = { };
  6014. int err;
  6015. do {
  6016. err = -NFS4ERR_WRONGSEC;
  6017. /* try to use integrity protection with machine cred */
  6018. if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
  6019. err = _nfs4_proc_secinfo(dir, name, flavors, true);
  6020. /*
  6021. * if unable to use integrity protection, or SECINFO with
  6022. * integrity protection returns NFS4ERR_WRONGSEC (which is
  6023. * disallowed by spec, but exists in deployed servers) use
  6024. * the current filesystem's rpc_client and the user cred.
  6025. */
  6026. if (err == -NFS4ERR_WRONGSEC)
  6027. err = _nfs4_proc_secinfo(dir, name, flavors, false);
  6028. trace_nfs4_secinfo(dir, name, err);
  6029. err = nfs4_handle_exception(NFS_SERVER(dir), err,
  6030. &exception);
  6031. } while (exception.retry);
  6032. return err;
  6033. }
  6034. #ifdef CONFIG_NFS_V4_1
  6035. /*
  6036. * Check the exchange flags returned by the server for invalid flags, having
  6037. * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
  6038. * DS flags set.
  6039. */
  6040. static int nfs4_check_cl_exchange_flags(u32 flags)
  6041. {
  6042. if (flags & ~EXCHGID4_FLAG_MASK_R)
  6043. goto out_inval;
  6044. if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
  6045. (flags & EXCHGID4_FLAG_USE_NON_PNFS))
  6046. goto out_inval;
  6047. if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
  6048. goto out_inval;
  6049. return NFS_OK;
  6050. out_inval:
  6051. return -NFS4ERR_INVAL;
  6052. }
  6053. static bool
  6054. nfs41_same_server_scope(struct nfs41_server_scope *a,
  6055. struct nfs41_server_scope *b)
  6056. {
  6057. if (a->server_scope_sz == b->server_scope_sz &&
  6058. memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
  6059. return true;
  6060. return false;
  6061. }
  6062. /*
  6063. * nfs4_proc_bind_conn_to_session()
  6064. *
  6065. * The 4.1 client currently uses the same TCP connection for the
  6066. * fore and backchannel.
  6067. */
  6068. int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
  6069. {
  6070. int status;
  6071. struct nfs41_bind_conn_to_session_args args = {
  6072. .client = clp,
  6073. .dir = NFS4_CDFC4_FORE_OR_BOTH,
  6074. };
  6075. struct nfs41_bind_conn_to_session_res res;
  6076. struct rpc_message msg = {
  6077. .rpc_proc =
  6078. &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
  6079. .rpc_argp = &args,
  6080. .rpc_resp = &res,
  6081. .rpc_cred = cred,
  6082. };
  6083. dprintk("--> %s\n", __func__);
  6084. nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id);
  6085. if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
  6086. args.dir = NFS4_CDFC4_FORE;
  6087. status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
  6088. trace_nfs4_bind_conn_to_session(clp, status);
  6089. if (status == 0) {
  6090. if (memcmp(res.sessionid.data,
  6091. clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
  6092. dprintk("NFS: %s: Session ID mismatch\n", __func__);
  6093. status = -EIO;
  6094. goto out;
  6095. }
  6096. if ((res.dir & args.dir) != res.dir || res.dir == 0) {
  6097. dprintk("NFS: %s: Unexpected direction from server\n",
  6098. __func__);
  6099. status = -EIO;
  6100. goto out;
  6101. }
  6102. if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) {
  6103. dprintk("NFS: %s: Server returned RDMA mode = true\n",
  6104. __func__);
  6105. status = -EIO;
  6106. goto out;
  6107. }
  6108. }
  6109. out:
  6110. dprintk("<-- %s status= %d\n", __func__, status);
  6111. return status;
  6112. }
  6113. /*
  6114. * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
  6115. * and operations we'd like to see to enable certain features in the allow map
  6116. */
  6117. static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
  6118. .how = SP4_MACH_CRED,
  6119. .enforce.u.words = {
  6120. [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
  6121. 1 << (OP_EXCHANGE_ID - 32) |
  6122. 1 << (OP_CREATE_SESSION - 32) |
  6123. 1 << (OP_DESTROY_SESSION - 32) |
  6124. 1 << (OP_DESTROY_CLIENTID - 32)
  6125. },
  6126. .allow.u.words = {
  6127. [0] = 1 << (OP_CLOSE) |
  6128. 1 << (OP_LOCKU) |
  6129. 1 << (OP_COMMIT),
  6130. [1] = 1 << (OP_SECINFO - 32) |
  6131. 1 << (OP_SECINFO_NO_NAME - 32) |
  6132. 1 << (OP_TEST_STATEID - 32) |
  6133. 1 << (OP_FREE_STATEID - 32) |
  6134. 1 << (OP_WRITE - 32)
  6135. }
  6136. };
  6137. /*
  6138. * Select the state protection mode for client `clp' given the server results
  6139. * from exchange_id in `sp'.
  6140. *
  6141. * Returns 0 on success, negative errno otherwise.
  6142. */
  6143. static int nfs4_sp4_select_mode(struct nfs_client *clp,
  6144. struct nfs41_state_protection *sp)
  6145. {
  6146. static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
  6147. [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
  6148. 1 << (OP_EXCHANGE_ID - 32) |
  6149. 1 << (OP_CREATE_SESSION - 32) |
  6150. 1 << (OP_DESTROY_SESSION - 32) |
  6151. 1 << (OP_DESTROY_CLIENTID - 32)
  6152. };
  6153. unsigned int i;
  6154. if (sp->how == SP4_MACH_CRED) {
  6155. /* Print state protect result */
  6156. dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
  6157. for (i = 0; i <= LAST_NFS4_OP; i++) {
  6158. if (test_bit(i, sp->enforce.u.longs))
  6159. dfprintk(MOUNT, " enforce op %d\n", i);
  6160. if (test_bit(i, sp->allow.u.longs))
  6161. dfprintk(MOUNT, " allow op %d\n", i);
  6162. }
  6163. /* make sure nothing is on enforce list that isn't supported */
  6164. for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
  6165. if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
  6166. dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
  6167. return -EINVAL;
  6168. }
  6169. }
  6170. /*
  6171. * Minimal mode - state operations are allowed to use machine
  6172. * credential. Note this already happens by default, so the
  6173. * client doesn't have to do anything more than the negotiation.
  6174. *
  6175. * NOTE: we don't care if EXCHANGE_ID is in the list -
  6176. * we're already using the machine cred for exchange_id
  6177. * and will never use a different cred.
  6178. */
  6179. if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
  6180. test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
  6181. test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
  6182. test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
  6183. dfprintk(MOUNT, "sp4_mach_cred:\n");
  6184. dfprintk(MOUNT, " minimal mode enabled\n");
  6185. set_bit(NFS_SP4_MACH_CRED_MINIMAL, &clp->cl_sp4_flags);
  6186. } else {
  6187. dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
  6188. return -EINVAL;
  6189. }
  6190. if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
  6191. test_bit(OP_LOCKU, sp->allow.u.longs)) {
  6192. dfprintk(MOUNT, " cleanup mode enabled\n");
  6193. set_bit(NFS_SP4_MACH_CRED_CLEANUP, &clp->cl_sp4_flags);
  6194. }
  6195. if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
  6196. test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
  6197. dfprintk(MOUNT, " secinfo mode enabled\n");
  6198. set_bit(NFS_SP4_MACH_CRED_SECINFO, &clp->cl_sp4_flags);
  6199. }
  6200. if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
  6201. test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
  6202. dfprintk(MOUNT, " stateid mode enabled\n");
  6203. set_bit(NFS_SP4_MACH_CRED_STATEID, &clp->cl_sp4_flags);
  6204. }
  6205. if (test_bit(OP_WRITE, sp->allow.u.longs)) {
  6206. dfprintk(MOUNT, " write mode enabled\n");
  6207. set_bit(NFS_SP4_MACH_CRED_WRITE, &clp->cl_sp4_flags);
  6208. }
  6209. if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
  6210. dfprintk(MOUNT, " commit mode enabled\n");
  6211. set_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags);
  6212. }
  6213. }
  6214. return 0;
  6215. }
  6216. /*
  6217. * _nfs4_proc_exchange_id()
  6218. *
  6219. * Wrapper for EXCHANGE_ID operation.
  6220. */
  6221. static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred,
  6222. u32 sp4_how)
  6223. {
  6224. nfs4_verifier verifier;
  6225. struct nfs41_exchange_id_args args = {
  6226. .verifier = &verifier,
  6227. .client = clp,
  6228. #ifdef CONFIG_NFS_V4_1_MIGRATION
  6229. .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
  6230. EXCHGID4_FLAG_BIND_PRINC_STATEID |
  6231. EXCHGID4_FLAG_SUPP_MOVED_MIGR,
  6232. #else
  6233. .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
  6234. EXCHGID4_FLAG_BIND_PRINC_STATEID,
  6235. #endif
  6236. };
  6237. struct nfs41_exchange_id_res res = {
  6238. 0
  6239. };
  6240. int status;
  6241. struct rpc_message msg = {
  6242. .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
  6243. .rpc_argp = &args,
  6244. .rpc_resp = &res,
  6245. .rpc_cred = cred,
  6246. };
  6247. nfs4_init_boot_verifier(clp, &verifier);
  6248. status = nfs4_init_uniform_client_string(clp);
  6249. if (status)
  6250. goto out;
  6251. dprintk("NFS call exchange_id auth=%s, '%s'\n",
  6252. clp->cl_rpcclient->cl_auth->au_ops->au_name,
  6253. clp->cl_owner_id);
  6254. res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
  6255. GFP_NOFS);
  6256. if (unlikely(res.server_owner == NULL)) {
  6257. status = -ENOMEM;
  6258. goto out;
  6259. }
  6260. res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
  6261. GFP_NOFS);
  6262. if (unlikely(res.server_scope == NULL)) {
  6263. status = -ENOMEM;
  6264. goto out_server_owner;
  6265. }
  6266. res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
  6267. if (unlikely(res.impl_id == NULL)) {
  6268. status = -ENOMEM;
  6269. goto out_server_scope;
  6270. }
  6271. switch (sp4_how) {
  6272. case SP4_NONE:
  6273. args.state_protect.how = SP4_NONE;
  6274. break;
  6275. case SP4_MACH_CRED:
  6276. args.state_protect = nfs4_sp4_mach_cred_request;
  6277. break;
  6278. default:
  6279. /* unsupported! */
  6280. WARN_ON_ONCE(1);
  6281. status = -EINVAL;
  6282. goto out_impl_id;
  6283. }
  6284. status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
  6285. trace_nfs4_exchange_id(clp, status);
  6286. if (status == 0)
  6287. status = nfs4_check_cl_exchange_flags(res.flags);
  6288. if (status == 0)
  6289. status = nfs4_sp4_select_mode(clp, &res.state_protect);
  6290. if (status == 0) {
  6291. clp->cl_clientid = res.clientid;
  6292. clp->cl_exchange_flags = res.flags;
  6293. /* Client ID is not confirmed */
  6294. if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R)) {
  6295. clear_bit(NFS4_SESSION_ESTABLISHED,
  6296. &clp->cl_session->session_state);
  6297. clp->cl_seqid = res.seqid;
  6298. }
  6299. kfree(clp->cl_serverowner);
  6300. clp->cl_serverowner = res.server_owner;
  6301. res.server_owner = NULL;
  6302. /* use the most recent implementation id */
  6303. kfree(clp->cl_implid);
  6304. clp->cl_implid = res.impl_id;
  6305. res.impl_id = NULL;
  6306. if (clp->cl_serverscope != NULL &&
  6307. !nfs41_same_server_scope(clp->cl_serverscope,
  6308. res.server_scope)) {
  6309. dprintk("%s: server_scope mismatch detected\n",
  6310. __func__);
  6311. set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
  6312. kfree(clp->cl_serverscope);
  6313. clp->cl_serverscope = NULL;
  6314. }
  6315. if (clp->cl_serverscope == NULL) {
  6316. clp->cl_serverscope = res.server_scope;
  6317. res.server_scope = NULL;
  6318. }
  6319. }
  6320. out_impl_id:
  6321. kfree(res.impl_id);
  6322. out_server_scope:
  6323. kfree(res.server_scope);
  6324. out_server_owner:
  6325. kfree(res.server_owner);
  6326. out:
  6327. if (clp->cl_implid != NULL)
  6328. dprintk("NFS reply exchange_id: Server Implementation ID: "
  6329. "domain: %s, name: %s, date: %llu,%u\n",
  6330. clp->cl_implid->domain, clp->cl_implid->name,
  6331. clp->cl_implid->date.seconds,
  6332. clp->cl_implid->date.nseconds);
  6333. dprintk("NFS reply exchange_id: %d\n", status);
  6334. return status;
  6335. }
  6336. /*
  6337. * nfs4_proc_exchange_id()
  6338. *
  6339. * Returns zero, a negative errno, or a negative NFS4ERR status code.
  6340. *
  6341. * Since the clientid has expired, all compounds using sessions
  6342. * associated with the stale clientid will be returning
  6343. * NFS4ERR_BADSESSION in the sequence operation, and will therefore
  6344. * be in some phase of session reset.
  6345. *
  6346. * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
  6347. */
  6348. int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
  6349. {
  6350. rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
  6351. int status;
  6352. /* try SP4_MACH_CRED if krb5i/p */
  6353. if (authflavor == RPC_AUTH_GSS_KRB5I ||
  6354. authflavor == RPC_AUTH_GSS_KRB5P) {
  6355. status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
  6356. if (!status)
  6357. return 0;
  6358. }
  6359. /* try SP4_NONE */
  6360. return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
  6361. }
  6362. static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
  6363. struct rpc_cred *cred)
  6364. {
  6365. struct rpc_message msg = {
  6366. .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
  6367. .rpc_argp = clp,
  6368. .rpc_cred = cred,
  6369. };
  6370. int status;
  6371. status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
  6372. trace_nfs4_destroy_clientid(clp, status);
  6373. if (status)
  6374. dprintk("NFS: Got error %d from the server %s on "
  6375. "DESTROY_CLIENTID.", status, clp->cl_hostname);
  6376. return status;
  6377. }
  6378. static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
  6379. struct rpc_cred *cred)
  6380. {
  6381. unsigned int loop;
  6382. int ret;
  6383. for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
  6384. ret = _nfs4_proc_destroy_clientid(clp, cred);
  6385. switch (ret) {
  6386. case -NFS4ERR_DELAY:
  6387. case -NFS4ERR_CLIENTID_BUSY:
  6388. ssleep(1);
  6389. break;
  6390. default:
  6391. return ret;
  6392. }
  6393. }
  6394. return 0;
  6395. }
  6396. int nfs4_destroy_clientid(struct nfs_client *clp)
  6397. {
  6398. struct rpc_cred *cred;
  6399. int ret = 0;
  6400. if (clp->cl_mvops->minor_version < 1)
  6401. goto out;
  6402. if (clp->cl_exchange_flags == 0)
  6403. goto out;
  6404. if (clp->cl_preserve_clid)
  6405. goto out;
  6406. cred = nfs4_get_clid_cred(clp);
  6407. ret = nfs4_proc_destroy_clientid(clp, cred);
  6408. if (cred)
  6409. put_rpccred(cred);
  6410. switch (ret) {
  6411. case 0:
  6412. case -NFS4ERR_STALE_CLIENTID:
  6413. clp->cl_exchange_flags = 0;
  6414. }
  6415. out:
  6416. return ret;
  6417. }
  6418. struct nfs4_get_lease_time_data {
  6419. struct nfs4_get_lease_time_args *args;
  6420. struct nfs4_get_lease_time_res *res;
  6421. struct nfs_client *clp;
  6422. };
  6423. static void nfs4_get_lease_time_prepare(struct rpc_task *task,
  6424. void *calldata)
  6425. {
  6426. struct nfs4_get_lease_time_data *data =
  6427. (struct nfs4_get_lease_time_data *)calldata;
  6428. dprintk("--> %s\n", __func__);
  6429. /* just setup sequence, do not trigger session recovery
  6430. since we're invoked within one */
  6431. nfs41_setup_sequence(data->clp->cl_session,
  6432. &data->args->la_seq_args,
  6433. &data->res->lr_seq_res,
  6434. task);
  6435. dprintk("<-- %s\n", __func__);
  6436. }
  6437. /*
  6438. * Called from nfs4_state_manager thread for session setup, so don't recover
  6439. * from sequence operation or clientid errors.
  6440. */
  6441. static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
  6442. {
  6443. struct nfs4_get_lease_time_data *data =
  6444. (struct nfs4_get_lease_time_data *)calldata;
  6445. dprintk("--> %s\n", __func__);
  6446. if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
  6447. return;
  6448. switch (task->tk_status) {
  6449. case -NFS4ERR_DELAY:
  6450. case -NFS4ERR_GRACE:
  6451. dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
  6452. rpc_delay(task, NFS4_POLL_RETRY_MIN);
  6453. task->tk_status = 0;
  6454. /* fall through */
  6455. case -NFS4ERR_RETRY_UNCACHED_REP:
  6456. rpc_restart_call_prepare(task);
  6457. return;
  6458. }
  6459. dprintk("<-- %s\n", __func__);
  6460. }
  6461. static const struct rpc_call_ops nfs4_get_lease_time_ops = {
  6462. .rpc_call_prepare = nfs4_get_lease_time_prepare,
  6463. .rpc_call_done = nfs4_get_lease_time_done,
  6464. };
  6465. int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
  6466. {
  6467. struct rpc_task *task;
  6468. struct nfs4_get_lease_time_args args;
  6469. struct nfs4_get_lease_time_res res = {
  6470. .lr_fsinfo = fsinfo,
  6471. };
  6472. struct nfs4_get_lease_time_data data = {
  6473. .args = &args,
  6474. .res = &res,
  6475. .clp = clp,
  6476. };
  6477. struct rpc_message msg = {
  6478. .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
  6479. .rpc_argp = &args,
  6480. .rpc_resp = &res,
  6481. };
  6482. struct rpc_task_setup task_setup = {
  6483. .rpc_client = clp->cl_rpcclient,
  6484. .rpc_message = &msg,
  6485. .callback_ops = &nfs4_get_lease_time_ops,
  6486. .callback_data = &data,
  6487. .flags = RPC_TASK_TIMEOUT,
  6488. };
  6489. int status;
  6490. nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
  6491. nfs4_set_sequence_privileged(&args.la_seq_args);
  6492. dprintk("--> %s\n", __func__);
  6493. task = rpc_run_task(&task_setup);
  6494. if (IS_ERR(task))
  6495. status = PTR_ERR(task);
  6496. else {
  6497. status = task->tk_status;
  6498. rpc_put_task(task);
  6499. }
  6500. dprintk("<-- %s return %d\n", __func__, status);
  6501. return status;
  6502. }
  6503. /*
  6504. * Initialize the values to be used by the client in CREATE_SESSION
  6505. * If nfs4_init_session set the fore channel request and response sizes,
  6506. * use them.
  6507. *
  6508. * Set the back channel max_resp_sz_cached to zero to force the client to
  6509. * always set csa_cachethis to FALSE because the current implementation
  6510. * of the back channel DRC only supports caching the CB_SEQUENCE operation.
  6511. */
  6512. static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
  6513. {
  6514. unsigned int max_rqst_sz, max_resp_sz;
  6515. max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
  6516. max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
  6517. /* Fore channel attributes */
  6518. args->fc_attrs.max_rqst_sz = max_rqst_sz;
  6519. args->fc_attrs.max_resp_sz = max_resp_sz;
  6520. args->fc_attrs.max_ops = NFS4_MAX_OPS;
  6521. args->fc_attrs.max_reqs = max_session_slots;
  6522. dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
  6523. "max_ops=%u max_reqs=%u\n",
  6524. __func__,
  6525. args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
  6526. args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
  6527. /* Back channel attributes */
  6528. args->bc_attrs.max_rqst_sz = PAGE_SIZE;
  6529. args->bc_attrs.max_resp_sz = PAGE_SIZE;
  6530. args->bc_attrs.max_resp_sz_cached = 0;
  6531. args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
  6532. args->bc_attrs.max_reqs = 1;
  6533. dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
  6534. "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
  6535. __func__,
  6536. args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
  6537. args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
  6538. args->bc_attrs.max_reqs);
  6539. }
  6540. static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args,
  6541. struct nfs41_create_session_res *res)
  6542. {
  6543. struct nfs4_channel_attrs *sent = &args->fc_attrs;
  6544. struct nfs4_channel_attrs *rcvd = &res->fc_attrs;
  6545. if (rcvd->max_resp_sz > sent->max_resp_sz)
  6546. return -EINVAL;
  6547. /*
  6548. * Our requested max_ops is the minimum we need; we're not
  6549. * prepared to break up compounds into smaller pieces than that.
  6550. * So, no point even trying to continue if the server won't
  6551. * cooperate:
  6552. */
  6553. if (rcvd->max_ops < sent->max_ops)
  6554. return -EINVAL;
  6555. if (rcvd->max_reqs == 0)
  6556. return -EINVAL;
  6557. if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
  6558. rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
  6559. return 0;
  6560. }
  6561. static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args,
  6562. struct nfs41_create_session_res *res)
  6563. {
  6564. struct nfs4_channel_attrs *sent = &args->bc_attrs;
  6565. struct nfs4_channel_attrs *rcvd = &res->bc_attrs;
  6566. if (!(res->flags & SESSION4_BACK_CHAN))
  6567. goto out;
  6568. if (rcvd->max_rqst_sz > sent->max_rqst_sz)
  6569. return -EINVAL;
  6570. if (rcvd->max_resp_sz < sent->max_resp_sz)
  6571. return -EINVAL;
  6572. if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
  6573. return -EINVAL;
  6574. /* These would render the backchannel useless: */
  6575. if (rcvd->max_ops != sent->max_ops)
  6576. return -EINVAL;
  6577. if (rcvd->max_reqs != sent->max_reqs)
  6578. return -EINVAL;
  6579. out:
  6580. return 0;
  6581. }
  6582. static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
  6583. struct nfs41_create_session_res *res)
  6584. {
  6585. int ret;
  6586. ret = nfs4_verify_fore_channel_attrs(args, res);
  6587. if (ret)
  6588. return ret;
  6589. return nfs4_verify_back_channel_attrs(args, res);
  6590. }
  6591. static void nfs4_update_session(struct nfs4_session *session,
  6592. struct nfs41_create_session_res *res)
  6593. {
  6594. nfs4_copy_sessionid(&session->sess_id, &res->sessionid);
  6595. /* Mark client id and session as being confirmed */
  6596. session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
  6597. set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state);
  6598. session->flags = res->flags;
  6599. memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs));
  6600. if (res->flags & SESSION4_BACK_CHAN)
  6601. memcpy(&session->bc_attrs, &res->bc_attrs,
  6602. sizeof(session->bc_attrs));
  6603. }
  6604. static int _nfs4_proc_create_session(struct nfs_client *clp,
  6605. struct rpc_cred *cred)
  6606. {
  6607. struct nfs4_session *session = clp->cl_session;
  6608. struct nfs41_create_session_args args = {
  6609. .client = clp,
  6610. .clientid = clp->cl_clientid,
  6611. .seqid = clp->cl_seqid,
  6612. .cb_program = NFS4_CALLBACK,
  6613. };
  6614. struct nfs41_create_session_res res;
  6615. struct rpc_message msg = {
  6616. .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
  6617. .rpc_argp = &args,
  6618. .rpc_resp = &res,
  6619. .rpc_cred = cred,
  6620. };
  6621. int status;
  6622. nfs4_init_channel_attrs(&args);
  6623. args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
  6624. status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
  6625. trace_nfs4_create_session(clp, status);
  6626. if (!status) {
  6627. /* Verify the session's negotiated channel_attrs values */
  6628. status = nfs4_verify_channel_attrs(&args, &res);
  6629. /* Increment the clientid slot sequence id */
  6630. if (clp->cl_seqid == res.seqid)
  6631. clp->cl_seqid++;
  6632. if (status)
  6633. goto out;
  6634. nfs4_update_session(session, &res);
  6635. }
  6636. out:
  6637. return status;
  6638. }
  6639. /*
  6640. * Issues a CREATE_SESSION operation to the server.
  6641. * It is the responsibility of the caller to verify the session is
  6642. * expired before calling this routine.
  6643. */
  6644. int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
  6645. {
  6646. int status;
  6647. unsigned *ptr;
  6648. struct nfs4_session *session = clp->cl_session;
  6649. dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
  6650. status = _nfs4_proc_create_session(clp, cred);
  6651. if (status)
  6652. goto out;
  6653. /* Init or reset the session slot tables */
  6654. status = nfs4_setup_session_slot_tables(session);
  6655. dprintk("slot table setup returned %d\n", status);
  6656. if (status)
  6657. goto out;
  6658. ptr = (unsigned *)&session->sess_id.data[0];
  6659. dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
  6660. clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
  6661. out:
  6662. dprintk("<-- %s\n", __func__);
  6663. return status;
  6664. }
  6665. /*
  6666. * Issue the over-the-wire RPC DESTROY_SESSION.
  6667. * The caller must serialize access to this routine.
  6668. */
  6669. int nfs4_proc_destroy_session(struct nfs4_session *session,
  6670. struct rpc_cred *cred)
  6671. {
  6672. struct rpc_message msg = {
  6673. .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
  6674. .rpc_argp = session,
  6675. .rpc_cred = cred,
  6676. };
  6677. int status = 0;
  6678. dprintk("--> nfs4_proc_destroy_session\n");
  6679. /* session is still being setup */
  6680. if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state))
  6681. return 0;
  6682. status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
  6683. trace_nfs4_destroy_session(session->clp, status);
  6684. if (status)
  6685. dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
  6686. "Session has been destroyed regardless...\n", status);
  6687. dprintk("<-- nfs4_proc_destroy_session\n");
  6688. return status;
  6689. }
  6690. /*
  6691. * Renew the cl_session lease.
  6692. */
  6693. struct nfs4_sequence_data {
  6694. struct nfs_client *clp;
  6695. struct nfs4_sequence_args args;
  6696. struct nfs4_sequence_res res;
  6697. };
  6698. static void nfs41_sequence_release(void *data)
  6699. {
  6700. struct nfs4_sequence_data *calldata = data;
  6701. struct nfs_client *clp = calldata->clp;
  6702. if (atomic_read(&clp->cl_count) > 1)
  6703. nfs4_schedule_state_renewal(clp);
  6704. nfs_put_client(clp);
  6705. kfree(calldata);
  6706. }
  6707. static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
  6708. {
  6709. switch(task->tk_status) {
  6710. case -NFS4ERR_DELAY:
  6711. rpc_delay(task, NFS4_POLL_RETRY_MAX);
  6712. return -EAGAIN;
  6713. default:
  6714. nfs4_schedule_lease_recovery(clp);
  6715. }
  6716. return 0;
  6717. }
  6718. static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
  6719. {
  6720. struct nfs4_sequence_data *calldata = data;
  6721. struct nfs_client *clp = calldata->clp;
  6722. if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
  6723. return;
  6724. trace_nfs4_sequence(clp, task->tk_status);
  6725. if (task->tk_status < 0) {
  6726. dprintk("%s ERROR %d\n", __func__, task->tk_status);
  6727. if (atomic_read(&clp->cl_count) == 1)
  6728. goto out;
  6729. if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
  6730. rpc_restart_call_prepare(task);
  6731. return;
  6732. }
  6733. }
  6734. dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
  6735. out:
  6736. dprintk("<-- %s\n", __func__);
  6737. }
  6738. static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
  6739. {
  6740. struct nfs4_sequence_data *calldata = data;
  6741. struct nfs_client *clp = calldata->clp;
  6742. struct nfs4_sequence_args *args;
  6743. struct nfs4_sequence_res *res;
  6744. args = task->tk_msg.rpc_argp;
  6745. res = task->tk_msg.rpc_resp;
  6746. nfs41_setup_sequence(clp->cl_session, args, res, task);
  6747. }
  6748. static const struct rpc_call_ops nfs41_sequence_ops = {
  6749. .rpc_call_done = nfs41_sequence_call_done,
  6750. .rpc_call_prepare = nfs41_sequence_prepare,
  6751. .rpc_release = nfs41_sequence_release,
  6752. };
  6753. static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
  6754. struct rpc_cred *cred,
  6755. bool is_privileged)
  6756. {
  6757. struct nfs4_sequence_data *calldata;
  6758. struct rpc_message msg = {
  6759. .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
  6760. .rpc_cred = cred,
  6761. };
  6762. struct rpc_task_setup task_setup_data = {
  6763. .rpc_client = clp->cl_rpcclient,
  6764. .rpc_message = &msg,
  6765. .callback_ops = &nfs41_sequence_ops,
  6766. .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
  6767. };
  6768. if (!atomic_inc_not_zero(&clp->cl_count))
  6769. return ERR_PTR(-EIO);
  6770. calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
  6771. if (calldata == NULL) {
  6772. nfs_put_client(clp);
  6773. return ERR_PTR(-ENOMEM);
  6774. }
  6775. nfs4_init_sequence(&calldata->args, &calldata->res, 0);
  6776. if (is_privileged)
  6777. nfs4_set_sequence_privileged(&calldata->args);
  6778. msg.rpc_argp = &calldata->args;
  6779. msg.rpc_resp = &calldata->res;
  6780. calldata->clp = clp;
  6781. task_setup_data.callback_data = calldata;
  6782. return rpc_run_task(&task_setup_data);
  6783. }
  6784. static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
  6785. {
  6786. struct rpc_task *task;
  6787. int ret = 0;
  6788. if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
  6789. return -EAGAIN;
  6790. task = _nfs41_proc_sequence(clp, cred, false);
  6791. if (IS_ERR(task))
  6792. ret = PTR_ERR(task);
  6793. else
  6794. rpc_put_task_async(task);
  6795. dprintk("<-- %s status=%d\n", __func__, ret);
  6796. return ret;
  6797. }
  6798. static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
  6799. {
  6800. struct rpc_task *task;
  6801. int ret;
  6802. task = _nfs41_proc_sequence(clp, cred, true);
  6803. if (IS_ERR(task)) {
  6804. ret = PTR_ERR(task);
  6805. goto out;
  6806. }
  6807. ret = rpc_wait_for_completion_task(task);
  6808. if (!ret)
  6809. ret = task->tk_status;
  6810. rpc_put_task(task);
  6811. out:
  6812. dprintk("<-- %s status=%d\n", __func__, ret);
  6813. return ret;
  6814. }
  6815. struct nfs4_reclaim_complete_data {
  6816. struct nfs_client *clp;
  6817. struct nfs41_reclaim_complete_args arg;
  6818. struct nfs41_reclaim_complete_res res;
  6819. };
  6820. static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
  6821. {
  6822. struct nfs4_reclaim_complete_data *calldata = data;
  6823. nfs41_setup_sequence(calldata->clp->cl_session,
  6824. &calldata->arg.seq_args,
  6825. &calldata->res.seq_res,
  6826. task);
  6827. }
  6828. static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
  6829. {
  6830. switch(task->tk_status) {
  6831. case 0:
  6832. case -NFS4ERR_COMPLETE_ALREADY:
  6833. case -NFS4ERR_WRONG_CRED: /* What to do here? */
  6834. break;
  6835. case -NFS4ERR_DELAY:
  6836. rpc_delay(task, NFS4_POLL_RETRY_MAX);
  6837. /* fall through */
  6838. case -NFS4ERR_RETRY_UNCACHED_REP:
  6839. return -EAGAIN;
  6840. default:
  6841. nfs4_schedule_lease_recovery(clp);
  6842. }
  6843. return 0;
  6844. }
  6845. static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
  6846. {
  6847. struct nfs4_reclaim_complete_data *calldata = data;
  6848. struct nfs_client *clp = calldata->clp;
  6849. struct nfs4_sequence_res *res = &calldata->res.seq_res;
  6850. dprintk("--> %s\n", __func__);
  6851. if (!nfs41_sequence_done(task, res))
  6852. return;
  6853. trace_nfs4_reclaim_complete(clp, task->tk_status);
  6854. if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
  6855. rpc_restart_call_prepare(task);
  6856. return;
  6857. }
  6858. dprintk("<-- %s\n", __func__);
  6859. }
  6860. static void nfs4_free_reclaim_complete_data(void *data)
  6861. {
  6862. struct nfs4_reclaim_complete_data *calldata = data;
  6863. kfree(calldata);
  6864. }
  6865. static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
  6866. .rpc_call_prepare = nfs4_reclaim_complete_prepare,
  6867. .rpc_call_done = nfs4_reclaim_complete_done,
  6868. .rpc_release = nfs4_free_reclaim_complete_data,
  6869. };
  6870. /*
  6871. * Issue a global reclaim complete.
  6872. */
  6873. static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
  6874. struct rpc_cred *cred)
  6875. {
  6876. struct nfs4_reclaim_complete_data *calldata;
  6877. struct rpc_task *task;
  6878. struct rpc_message msg = {
  6879. .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
  6880. .rpc_cred = cred,
  6881. };
  6882. struct rpc_task_setup task_setup_data = {
  6883. .rpc_client = clp->cl_rpcclient,
  6884. .rpc_message = &msg,
  6885. .callback_ops = &nfs4_reclaim_complete_call_ops,
  6886. .flags = RPC_TASK_ASYNC,
  6887. };
  6888. int status = -ENOMEM;
  6889. dprintk("--> %s\n", __func__);
  6890. calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
  6891. if (calldata == NULL)
  6892. goto out;
  6893. calldata->clp = clp;
  6894. calldata->arg.one_fs = 0;
  6895. nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
  6896. nfs4_set_sequence_privileged(&calldata->arg.seq_args);
  6897. msg.rpc_argp = &calldata->arg;
  6898. msg.rpc_resp = &calldata->res;
  6899. task_setup_data.callback_data = calldata;
  6900. task = rpc_run_task(&task_setup_data);
  6901. if (IS_ERR(task)) {
  6902. status = PTR_ERR(task);
  6903. goto out;
  6904. }
  6905. status = nfs4_wait_for_completion_rpc_task(task);
  6906. if (status == 0)
  6907. status = task->tk_status;
  6908. rpc_put_task(task);
  6909. return 0;
  6910. out:
  6911. dprintk("<-- %s status=%d\n", __func__, status);
  6912. return status;
  6913. }
  6914. static void
  6915. nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
  6916. {
  6917. struct nfs4_layoutget *lgp = calldata;
  6918. struct nfs_server *server = NFS_SERVER(lgp->args.inode);
  6919. struct nfs4_session *session = nfs4_get_session(server);
  6920. dprintk("--> %s\n", __func__);
  6921. /* Note the is a race here, where a CB_LAYOUTRECALL can come in
  6922. * right now covering the LAYOUTGET we are about to send.
  6923. * However, that is not so catastrophic, and there seems
  6924. * to be no way to prevent it completely.
  6925. */
  6926. if (nfs41_setup_sequence(session, &lgp->args.seq_args,
  6927. &lgp->res.seq_res, task))
  6928. return;
  6929. if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
  6930. NFS_I(lgp->args.inode)->layout,
  6931. &lgp->args.range,
  6932. lgp->args.ctx->state)) {
  6933. rpc_exit(task, NFS4_OK);
  6934. }
  6935. }
  6936. static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
  6937. {
  6938. struct nfs4_layoutget *lgp = calldata;
  6939. struct inode *inode = lgp->args.inode;
  6940. struct nfs_server *server = NFS_SERVER(inode);
  6941. struct pnfs_layout_hdr *lo;
  6942. struct nfs4_state *state = NULL;
  6943. unsigned long timeo, now, giveup;
  6944. dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status);
  6945. if (!nfs41_sequence_done(task, &lgp->res.seq_res))
  6946. goto out;
  6947. switch (task->tk_status) {
  6948. case 0:
  6949. goto out;
  6950. /*
  6951. * NFS4ERR_BADLAYOUT means the MDS cannot return a layout of
  6952. * length lgp->args.minlength != 0 (see RFC5661 section 18.43.3).
  6953. */
  6954. case -NFS4ERR_BADLAYOUT:
  6955. goto out_overflow;
  6956. /*
  6957. * NFS4ERR_LAYOUTTRYLATER is a conflict with another client
  6958. * (or clients) writing to the same RAID stripe except when
  6959. * the minlength argument is 0 (see RFC5661 section 18.43.3).
  6960. */
  6961. case -NFS4ERR_LAYOUTTRYLATER:
  6962. if (lgp->args.minlength == 0)
  6963. goto out_overflow;
  6964. /*
  6965. * NFS4ERR_RECALLCONFLICT is when conflict with self (must recall
  6966. * existing layout before getting a new one).
  6967. */
  6968. case -NFS4ERR_RECALLCONFLICT:
  6969. timeo = rpc_get_timeout(task->tk_client);
  6970. giveup = lgp->args.timestamp + timeo;
  6971. now = jiffies;
  6972. if (time_after(giveup, now)) {
  6973. unsigned long delay;
  6974. /* Delay for:
  6975. * - Not less then NFS4_POLL_RETRY_MIN.
  6976. * - One last time a jiffie before we give up
  6977. * - exponential backoff (time_now minus start_attempt)
  6978. */
  6979. delay = max_t(unsigned long, NFS4_POLL_RETRY_MIN,
  6980. min((giveup - now - 1),
  6981. now - lgp->args.timestamp));
  6982. dprintk("%s: NFS4ERR_RECALLCONFLICT waiting %lu\n",
  6983. __func__, delay);
  6984. rpc_delay(task, delay);
  6985. /* Do not call nfs4_async_handle_error() */
  6986. goto out_restart;
  6987. }
  6988. break;
  6989. case -NFS4ERR_EXPIRED:
  6990. case -NFS4ERR_BAD_STATEID:
  6991. spin_lock(&inode->i_lock);
  6992. if (nfs4_stateid_match(&lgp->args.stateid,
  6993. &lgp->args.ctx->state->stateid)) {
  6994. spin_unlock(&inode->i_lock);
  6995. /* If the open stateid was bad, then recover it. */
  6996. state = lgp->args.ctx->state;
  6997. break;
  6998. }
  6999. lo = NFS_I(inode)->layout;
  7000. if (lo && nfs4_stateid_match(&lgp->args.stateid,
  7001. &lo->plh_stateid)) {
  7002. LIST_HEAD(head);
  7003. /*
  7004. * Mark the bad layout state as invalid, then retry
  7005. * with the current stateid.
  7006. */
  7007. set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
  7008. pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
  7009. spin_unlock(&inode->i_lock);
  7010. pnfs_free_lseg_list(&head);
  7011. } else
  7012. spin_unlock(&inode->i_lock);
  7013. goto out_restart;
  7014. }
  7015. if (nfs4_async_handle_error(task, server, state, NULL) == -EAGAIN)
  7016. goto out_restart;
  7017. out:
  7018. dprintk("<-- %s\n", __func__);
  7019. return;
  7020. out_restart:
  7021. task->tk_status = 0;
  7022. rpc_restart_call_prepare(task);
  7023. return;
  7024. out_overflow:
  7025. task->tk_status = -EOVERFLOW;
  7026. goto out;
  7027. }
  7028. static size_t max_response_pages(struct nfs_server *server)
  7029. {
  7030. u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
  7031. return nfs_page_array_len(0, max_resp_sz);
  7032. }
  7033. static void nfs4_free_pages(struct page **pages, size_t size)
  7034. {
  7035. int i;
  7036. if (!pages)
  7037. return;
  7038. for (i = 0; i < size; i++) {
  7039. if (!pages[i])
  7040. break;
  7041. __free_page(pages[i]);
  7042. }
  7043. kfree(pages);
  7044. }
  7045. static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
  7046. {
  7047. struct page **pages;
  7048. int i;
  7049. pages = kcalloc(size, sizeof(struct page *), gfp_flags);
  7050. if (!pages) {
  7051. dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
  7052. return NULL;
  7053. }
  7054. for (i = 0; i < size; i++) {
  7055. pages[i] = alloc_page(gfp_flags);
  7056. if (!pages[i]) {
  7057. dprintk("%s: failed to allocate page\n", __func__);
  7058. nfs4_free_pages(pages, size);
  7059. return NULL;
  7060. }
  7061. }
  7062. return pages;
  7063. }
  7064. static void nfs4_layoutget_release(void *calldata)
  7065. {
  7066. struct nfs4_layoutget *lgp = calldata;
  7067. struct inode *inode = lgp->args.inode;
  7068. struct nfs_server *server = NFS_SERVER(inode);
  7069. size_t max_pages = max_response_pages(server);
  7070. dprintk("--> %s\n", __func__);
  7071. nfs4_free_pages(lgp->args.layout.pages, max_pages);
  7072. pnfs_put_layout_hdr(NFS_I(inode)->layout);
  7073. put_nfs_open_context(lgp->args.ctx);
  7074. kfree(calldata);
  7075. dprintk("<-- %s\n", __func__);
  7076. }
  7077. static const struct rpc_call_ops nfs4_layoutget_call_ops = {
  7078. .rpc_call_prepare = nfs4_layoutget_prepare,
  7079. .rpc_call_done = nfs4_layoutget_done,
  7080. .rpc_release = nfs4_layoutget_release,
  7081. };
  7082. struct pnfs_layout_segment *
  7083. nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
  7084. {
  7085. struct inode *inode = lgp->args.inode;
  7086. struct nfs_server *server = NFS_SERVER(inode);
  7087. size_t max_pages = max_response_pages(server);
  7088. struct rpc_task *task;
  7089. struct rpc_message msg = {
  7090. .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
  7091. .rpc_argp = &lgp->args,
  7092. .rpc_resp = &lgp->res,
  7093. .rpc_cred = lgp->cred,
  7094. };
  7095. struct rpc_task_setup task_setup_data = {
  7096. .rpc_client = server->client,
  7097. .rpc_message = &msg,
  7098. .callback_ops = &nfs4_layoutget_call_ops,
  7099. .callback_data = lgp,
  7100. .flags = RPC_TASK_ASYNC,
  7101. };
  7102. struct pnfs_layout_segment *lseg = NULL;
  7103. int status = 0;
  7104. dprintk("--> %s\n", __func__);
  7105. /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
  7106. pnfs_get_layout_hdr(NFS_I(inode)->layout);
  7107. lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
  7108. if (!lgp->args.layout.pages) {
  7109. nfs4_layoutget_release(lgp);
  7110. return ERR_PTR(-ENOMEM);
  7111. }
  7112. lgp->args.layout.pglen = max_pages * PAGE_SIZE;
  7113. lgp->args.timestamp = jiffies;
  7114. lgp->res.layoutp = &lgp->args.layout;
  7115. lgp->res.seq_res.sr_slot = NULL;
  7116. nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
  7117. task = rpc_run_task(&task_setup_data);
  7118. if (IS_ERR(task))
  7119. return ERR_CAST(task);
  7120. status = nfs4_wait_for_completion_rpc_task(task);
  7121. if (status == 0)
  7122. status = task->tk_status;
  7123. trace_nfs4_layoutget(lgp->args.ctx,
  7124. &lgp->args.range,
  7125. &lgp->res.range,
  7126. status);
  7127. /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */
  7128. if (status == 0 && lgp->res.layoutp->len)
  7129. lseg = pnfs_layout_process(lgp);
  7130. rpc_put_task(task);
  7131. dprintk("<-- %s status=%d\n", __func__, status);
  7132. if (status)
  7133. return ERR_PTR(status);
  7134. return lseg;
  7135. }
  7136. static void
  7137. nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
  7138. {
  7139. struct nfs4_layoutreturn *lrp = calldata;
  7140. dprintk("--> %s\n", __func__);
  7141. nfs41_setup_sequence(lrp->clp->cl_session,
  7142. &lrp->args.seq_args,
  7143. &lrp->res.seq_res,
  7144. task);
  7145. }
  7146. static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
  7147. {
  7148. struct nfs4_layoutreturn *lrp = calldata;
  7149. struct nfs_server *server;
  7150. dprintk("--> %s\n", __func__);
  7151. if (!nfs41_sequence_done(task, &lrp->res.seq_res))
  7152. return;
  7153. server = NFS_SERVER(lrp->args.inode);
  7154. switch (task->tk_status) {
  7155. default:
  7156. task->tk_status = 0;
  7157. case 0:
  7158. break;
  7159. case -NFS4ERR_DELAY:
  7160. if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN)
  7161. break;
  7162. rpc_restart_call_prepare(task);
  7163. return;
  7164. }
  7165. dprintk("<-- %s\n", __func__);
  7166. }
  7167. static void nfs4_layoutreturn_release(void *calldata)
  7168. {
  7169. struct nfs4_layoutreturn *lrp = calldata;
  7170. struct pnfs_layout_hdr *lo = lrp->args.layout;
  7171. LIST_HEAD(freeme);
  7172. dprintk("--> %s\n", __func__);
  7173. spin_lock(&lo->plh_inode->i_lock);
  7174. if (lrp->res.lrs_present)
  7175. pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
  7176. pnfs_mark_matching_lsegs_invalid(lo, &freeme, &lrp->args.range);
  7177. pnfs_clear_layoutreturn_waitbit(lo);
  7178. lo->plh_block_lgets--;
  7179. spin_unlock(&lo->plh_inode->i_lock);
  7180. pnfs_free_lseg_list(&freeme);
  7181. pnfs_put_layout_hdr(lrp->args.layout);
  7182. nfs_iput_and_deactive(lrp->inode);
  7183. kfree(calldata);
  7184. dprintk("<-- %s\n", __func__);
  7185. }
  7186. static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
  7187. .rpc_call_prepare = nfs4_layoutreturn_prepare,
  7188. .rpc_call_done = nfs4_layoutreturn_done,
  7189. .rpc_release = nfs4_layoutreturn_release,
  7190. };
  7191. int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync)
  7192. {
  7193. struct rpc_task *task;
  7194. struct rpc_message msg = {
  7195. .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
  7196. .rpc_argp = &lrp->args,
  7197. .rpc_resp = &lrp->res,
  7198. .rpc_cred = lrp->cred,
  7199. };
  7200. struct rpc_task_setup task_setup_data = {
  7201. .rpc_client = NFS_SERVER(lrp->args.inode)->client,
  7202. .rpc_message = &msg,
  7203. .callback_ops = &nfs4_layoutreturn_call_ops,
  7204. .callback_data = lrp,
  7205. };
  7206. int status = 0;
  7207. dprintk("--> %s\n", __func__);
  7208. if (!sync) {
  7209. lrp->inode = nfs_igrab_and_active(lrp->args.inode);
  7210. if (!lrp->inode) {
  7211. nfs4_layoutreturn_release(lrp);
  7212. return -EAGAIN;
  7213. }
  7214. task_setup_data.flags |= RPC_TASK_ASYNC;
  7215. }
  7216. nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
  7217. task = rpc_run_task(&task_setup_data);
  7218. if (IS_ERR(task))
  7219. return PTR_ERR(task);
  7220. if (sync)
  7221. status = task->tk_status;
  7222. trace_nfs4_layoutreturn(lrp->args.inode, status);
  7223. dprintk("<-- %s status=%d\n", __func__, status);
  7224. rpc_put_task(task);
  7225. return status;
  7226. }
  7227. static int
  7228. _nfs4_proc_getdeviceinfo(struct nfs_server *server,
  7229. struct pnfs_device *pdev,
  7230. struct rpc_cred *cred)
  7231. {
  7232. struct nfs4_getdeviceinfo_args args = {
  7233. .pdev = pdev,
  7234. .notify_types = NOTIFY_DEVICEID4_CHANGE |
  7235. NOTIFY_DEVICEID4_DELETE,
  7236. };
  7237. struct nfs4_getdeviceinfo_res res = {
  7238. .pdev = pdev,
  7239. };
  7240. struct rpc_message msg = {
  7241. .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
  7242. .rpc_argp = &args,
  7243. .rpc_resp = &res,
  7244. .rpc_cred = cred,
  7245. };
  7246. int status;
  7247. dprintk("--> %s\n", __func__);
  7248. status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
  7249. if (res.notification & ~args.notify_types)
  7250. dprintk("%s: unsupported notification\n", __func__);
  7251. if (res.notification != args.notify_types)
  7252. pdev->nocache = 1;
  7253. dprintk("<-- %s status=%d\n", __func__, status);
  7254. return status;
  7255. }
  7256. int nfs4_proc_getdeviceinfo(struct nfs_server *server,
  7257. struct pnfs_device *pdev,
  7258. struct rpc_cred *cred)
  7259. {
  7260. struct nfs4_exception exception = { };
  7261. int err;
  7262. do {
  7263. err = nfs4_handle_exception(server,
  7264. _nfs4_proc_getdeviceinfo(server, pdev, cred),
  7265. &exception);
  7266. } while (exception.retry);
  7267. return err;
  7268. }
  7269. EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
  7270. static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
  7271. {
  7272. struct nfs4_layoutcommit_data *data = calldata;
  7273. struct nfs_server *server = NFS_SERVER(data->args.inode);
  7274. struct nfs4_session *session = nfs4_get_session(server);
  7275. nfs41_setup_sequence(session,
  7276. &data->args.seq_args,
  7277. &data->res.seq_res,
  7278. task);
  7279. }
  7280. static void
  7281. nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
  7282. {
  7283. struct nfs4_layoutcommit_data *data = calldata;
  7284. struct nfs_server *server = NFS_SERVER(data->args.inode);
  7285. if (!nfs41_sequence_done(task, &data->res.seq_res))
  7286. return;
  7287. switch (task->tk_status) { /* Just ignore these failures */
  7288. case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
  7289. case -NFS4ERR_BADIOMODE: /* no IOMODE_RW layout for range */
  7290. case -NFS4ERR_BADLAYOUT: /* no layout */
  7291. case -NFS4ERR_GRACE: /* loca_recalim always false */
  7292. task->tk_status = 0;
  7293. case 0:
  7294. break;
  7295. default:
  7296. if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) {
  7297. rpc_restart_call_prepare(task);
  7298. return;
  7299. }
  7300. }
  7301. }
  7302. static void nfs4_layoutcommit_release(void *calldata)
  7303. {
  7304. struct nfs4_layoutcommit_data *data = calldata;
  7305. pnfs_cleanup_layoutcommit(data);
  7306. nfs_post_op_update_inode_force_wcc(data->args.inode,
  7307. data->res.fattr);
  7308. put_rpccred(data->cred);
  7309. nfs_iput_and_deactive(data->inode);
  7310. kfree(data);
  7311. }
  7312. static const struct rpc_call_ops nfs4_layoutcommit_ops = {
  7313. .rpc_call_prepare = nfs4_layoutcommit_prepare,
  7314. .rpc_call_done = nfs4_layoutcommit_done,
  7315. .rpc_release = nfs4_layoutcommit_release,
  7316. };
  7317. int
  7318. nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
  7319. {
  7320. struct rpc_message msg = {
  7321. .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
  7322. .rpc_argp = &data->args,
  7323. .rpc_resp = &data->res,
  7324. .rpc_cred = data->cred,
  7325. };
  7326. struct rpc_task_setup task_setup_data = {
  7327. .task = &data->task,
  7328. .rpc_client = NFS_CLIENT(data->args.inode),
  7329. .rpc_message = &msg,
  7330. .callback_ops = &nfs4_layoutcommit_ops,
  7331. .callback_data = data,
  7332. };
  7333. struct rpc_task *task;
  7334. int status = 0;
  7335. dprintk("NFS: initiating layoutcommit call. sync %d "
  7336. "lbw: %llu inode %lu\n", sync,
  7337. data->args.lastbytewritten,
  7338. data->args.inode->i_ino);
  7339. if (!sync) {
  7340. data->inode = nfs_igrab_and_active(data->args.inode);
  7341. if (data->inode == NULL) {
  7342. nfs4_layoutcommit_release(data);
  7343. return -EAGAIN;
  7344. }
  7345. task_setup_data.flags = RPC_TASK_ASYNC;
  7346. }
  7347. nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
  7348. task = rpc_run_task(&task_setup_data);
  7349. if (IS_ERR(task))
  7350. return PTR_ERR(task);
  7351. if (sync)
  7352. status = task->tk_status;
  7353. trace_nfs4_layoutcommit(data->args.inode, status);
  7354. dprintk("%s: status %d\n", __func__, status);
  7355. rpc_put_task(task);
  7356. return status;
  7357. }
  7358. /**
  7359. * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
  7360. * possible) as per RFC3530bis and RFC5661 Security Considerations sections
  7361. */
  7362. static int
  7363. _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
  7364. struct nfs_fsinfo *info,
  7365. struct nfs4_secinfo_flavors *flavors, bool use_integrity)
  7366. {
  7367. struct nfs41_secinfo_no_name_args args = {
  7368. .style = SECINFO_STYLE_CURRENT_FH,
  7369. };
  7370. struct nfs4_secinfo_res res = {
  7371. .flavors = flavors,
  7372. };
  7373. struct rpc_message msg = {
  7374. .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
  7375. .rpc_argp = &args,
  7376. .rpc_resp = &res,
  7377. };
  7378. struct rpc_clnt *clnt = server->client;
  7379. struct rpc_cred *cred = NULL;
  7380. int status;
  7381. if (use_integrity) {
  7382. clnt = server->nfs_client->cl_rpcclient;
  7383. cred = nfs4_get_clid_cred(server->nfs_client);
  7384. msg.rpc_cred = cred;
  7385. }
  7386. dprintk("--> %s\n", __func__);
  7387. status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
  7388. &res.seq_res, 0);
  7389. dprintk("<-- %s status=%d\n", __func__, status);
  7390. if (cred)
  7391. put_rpccred(cred);
  7392. return status;
  7393. }
  7394. static int
  7395. nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
  7396. struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
  7397. {
  7398. struct nfs4_exception exception = { };
  7399. int err;
  7400. do {
  7401. /* first try using integrity protection */
  7402. err = -NFS4ERR_WRONGSEC;
  7403. /* try to use integrity protection with machine cred */
  7404. if (_nfs4_is_integrity_protected(server->nfs_client))
  7405. err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
  7406. flavors, true);
  7407. /*
  7408. * if unable to use integrity protection, or SECINFO with
  7409. * integrity protection returns NFS4ERR_WRONGSEC (which is
  7410. * disallowed by spec, but exists in deployed servers) use
  7411. * the current filesystem's rpc_client and the user cred.
  7412. */
  7413. if (err == -NFS4ERR_WRONGSEC)
  7414. err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
  7415. flavors, false);
  7416. switch (err) {
  7417. case 0:
  7418. case -NFS4ERR_WRONGSEC:
  7419. case -ENOTSUPP:
  7420. goto out;
  7421. default:
  7422. err = nfs4_handle_exception(server, err, &exception);
  7423. }
  7424. } while (exception.retry);
  7425. out:
  7426. return err;
  7427. }
  7428. static int
  7429. nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
  7430. struct nfs_fsinfo *info)
  7431. {
  7432. int err;
  7433. struct page *page;
  7434. rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
  7435. struct nfs4_secinfo_flavors *flavors;
  7436. struct nfs4_secinfo4 *secinfo;
  7437. int i;
  7438. page = alloc_page(GFP_KERNEL);
  7439. if (!page) {
  7440. err = -ENOMEM;
  7441. goto out;
  7442. }
  7443. flavors = page_address(page);
  7444. err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
  7445. /*
  7446. * Fall back on "guess and check" method if
  7447. * the server doesn't support SECINFO_NO_NAME
  7448. */
  7449. if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) {
  7450. err = nfs4_find_root_sec(server, fhandle, info);
  7451. goto out_freepage;
  7452. }
  7453. if (err)
  7454. goto out_freepage;
  7455. for (i = 0; i < flavors->num_flavors; i++) {
  7456. secinfo = &flavors->flavors[i];
  7457. switch (secinfo->flavor) {
  7458. case RPC_AUTH_NULL:
  7459. case RPC_AUTH_UNIX:
  7460. case RPC_AUTH_GSS:
  7461. flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
  7462. &secinfo->flavor_info);
  7463. break;
  7464. default:
  7465. flavor = RPC_AUTH_MAXFLAVOR;
  7466. break;
  7467. }
  7468. if (!nfs_auth_info_match(&server->auth_info, flavor))
  7469. flavor = RPC_AUTH_MAXFLAVOR;
  7470. if (flavor != RPC_AUTH_MAXFLAVOR) {
  7471. err = nfs4_lookup_root_sec(server, fhandle,
  7472. info, flavor);
  7473. if (!err)
  7474. break;
  7475. }
  7476. }
  7477. if (flavor == RPC_AUTH_MAXFLAVOR)
  7478. err = -EPERM;
  7479. out_freepage:
  7480. put_page(page);
  7481. if (err == -EACCES)
  7482. return -EPERM;
  7483. out:
  7484. return err;
  7485. }
  7486. static int _nfs41_test_stateid(struct nfs_server *server,
  7487. nfs4_stateid *stateid,
  7488. struct rpc_cred *cred)
  7489. {
  7490. int status;
  7491. struct nfs41_test_stateid_args args = {
  7492. .stateid = stateid,
  7493. };
  7494. struct nfs41_test_stateid_res res;
  7495. struct rpc_message msg = {
  7496. .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
  7497. .rpc_argp = &args,
  7498. .rpc_resp = &res,
  7499. .rpc_cred = cred,
  7500. };
  7501. struct rpc_clnt *rpc_client = server->client;
  7502. nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
  7503. &rpc_client, &msg);
  7504. dprintk("NFS call test_stateid %p\n", stateid);
  7505. nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
  7506. nfs4_set_sequence_privileged(&args.seq_args);
  7507. status = nfs4_call_sync_sequence(rpc_client, server, &msg,
  7508. &args.seq_args, &res.seq_res);
  7509. if (status != NFS_OK) {
  7510. dprintk("NFS reply test_stateid: failed, %d\n", status);
  7511. return status;
  7512. }
  7513. dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
  7514. return -res.status;
  7515. }
  7516. /**
  7517. * nfs41_test_stateid - perform a TEST_STATEID operation
  7518. *
  7519. * @server: server / transport on which to perform the operation
  7520. * @stateid: state ID to test
  7521. * @cred: credential
  7522. *
  7523. * Returns NFS_OK if the server recognizes that "stateid" is valid.
  7524. * Otherwise a negative NFS4ERR value is returned if the operation
  7525. * failed or the state ID is not currently valid.
  7526. */
  7527. static int nfs41_test_stateid(struct nfs_server *server,
  7528. nfs4_stateid *stateid,
  7529. struct rpc_cred *cred)
  7530. {
  7531. struct nfs4_exception exception = { };
  7532. int err;
  7533. do {
  7534. err = _nfs41_test_stateid(server, stateid, cred);
  7535. if (err != -NFS4ERR_DELAY)
  7536. break;
  7537. nfs4_handle_exception(server, err, &exception);
  7538. } while (exception.retry);
  7539. return err;
  7540. }
  7541. struct nfs_free_stateid_data {
  7542. struct nfs_server *server;
  7543. struct nfs41_free_stateid_args args;
  7544. struct nfs41_free_stateid_res res;
  7545. };
  7546. static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
  7547. {
  7548. struct nfs_free_stateid_data *data = calldata;
  7549. nfs41_setup_sequence(nfs4_get_session(data->server),
  7550. &data->args.seq_args,
  7551. &data->res.seq_res,
  7552. task);
  7553. }
  7554. static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
  7555. {
  7556. struct nfs_free_stateid_data *data = calldata;
  7557. nfs41_sequence_done(task, &data->res.seq_res);
  7558. switch (task->tk_status) {
  7559. case -NFS4ERR_DELAY:
  7560. if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN)
  7561. rpc_restart_call_prepare(task);
  7562. }
  7563. }
  7564. static void nfs41_free_stateid_release(void *calldata)
  7565. {
  7566. kfree(calldata);
  7567. }
  7568. static const struct rpc_call_ops nfs41_free_stateid_ops = {
  7569. .rpc_call_prepare = nfs41_free_stateid_prepare,
  7570. .rpc_call_done = nfs41_free_stateid_done,
  7571. .rpc_release = nfs41_free_stateid_release,
  7572. };
  7573. static struct rpc_task *_nfs41_free_stateid(struct nfs_server *server,
  7574. nfs4_stateid *stateid,
  7575. struct rpc_cred *cred,
  7576. bool privileged)
  7577. {
  7578. struct rpc_message msg = {
  7579. .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
  7580. .rpc_cred = cred,
  7581. };
  7582. struct rpc_task_setup task_setup = {
  7583. .rpc_client = server->client,
  7584. .rpc_message = &msg,
  7585. .callback_ops = &nfs41_free_stateid_ops,
  7586. .flags = RPC_TASK_ASYNC,
  7587. };
  7588. struct nfs_free_stateid_data *data;
  7589. nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
  7590. &task_setup.rpc_client, &msg);
  7591. dprintk("NFS call free_stateid %p\n", stateid);
  7592. data = kmalloc(sizeof(*data), GFP_NOFS);
  7593. if (!data)
  7594. return ERR_PTR(-ENOMEM);
  7595. data->server = server;
  7596. nfs4_stateid_copy(&data->args.stateid, stateid);
  7597. task_setup.callback_data = data;
  7598. msg.rpc_argp = &data->args;
  7599. msg.rpc_resp = &data->res;
  7600. nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
  7601. if (privileged)
  7602. nfs4_set_sequence_privileged(&data->args.seq_args);
  7603. return rpc_run_task(&task_setup);
  7604. }
  7605. /**
  7606. * nfs41_free_stateid - perform a FREE_STATEID operation
  7607. *
  7608. * @server: server / transport on which to perform the operation
  7609. * @stateid: state ID to release
  7610. * @cred: credential
  7611. *
  7612. * Returns NFS_OK if the server freed "stateid". Otherwise a
  7613. * negative NFS4ERR value is returned.
  7614. */
  7615. static int nfs41_free_stateid(struct nfs_server *server,
  7616. nfs4_stateid *stateid,
  7617. struct rpc_cred *cred)
  7618. {
  7619. struct rpc_task *task;
  7620. int ret;
  7621. task = _nfs41_free_stateid(server, stateid, cred, true);
  7622. if (IS_ERR(task))
  7623. return PTR_ERR(task);
  7624. ret = rpc_wait_for_completion_task(task);
  7625. if (!ret)
  7626. ret = task->tk_status;
  7627. rpc_put_task(task);
  7628. return ret;
  7629. }
  7630. static void
  7631. nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
  7632. {
  7633. struct rpc_task *task;
  7634. struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
  7635. task = _nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
  7636. nfs4_free_lock_state(server, lsp);
  7637. if (IS_ERR(task))
  7638. return;
  7639. rpc_put_task(task);
  7640. }
  7641. static bool nfs41_match_stateid(const nfs4_stateid *s1,
  7642. const nfs4_stateid *s2)
  7643. {
  7644. if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
  7645. return false;
  7646. if (s1->seqid == s2->seqid)
  7647. return true;
  7648. if (s1->seqid == 0 || s2->seqid == 0)
  7649. return true;
  7650. return false;
  7651. }
  7652. #endif /* CONFIG_NFS_V4_1 */
  7653. static bool nfs4_match_stateid(const nfs4_stateid *s1,
  7654. const nfs4_stateid *s2)
  7655. {
  7656. return nfs4_stateid_match(s1, s2);
  7657. }
  7658. static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
  7659. .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
  7660. .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
  7661. .recover_open = nfs4_open_reclaim,
  7662. .recover_lock = nfs4_lock_reclaim,
  7663. .establish_clid = nfs4_init_clientid,
  7664. .detect_trunking = nfs40_discover_server_trunking,
  7665. };
  7666. #if defined(CONFIG_NFS_V4_1)
  7667. static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
  7668. .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
  7669. .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
  7670. .recover_open = nfs4_open_reclaim,
  7671. .recover_lock = nfs4_lock_reclaim,
  7672. .establish_clid = nfs41_init_clientid,
  7673. .reclaim_complete = nfs41_proc_reclaim_complete,
  7674. .detect_trunking = nfs41_discover_server_trunking,
  7675. };
  7676. #endif /* CONFIG_NFS_V4_1 */
  7677. static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
  7678. .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
  7679. .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
  7680. .recover_open = nfs40_open_expired,
  7681. .recover_lock = nfs4_lock_expired,
  7682. .establish_clid = nfs4_init_clientid,
  7683. };
  7684. #if defined(CONFIG_NFS_V4_1)
  7685. static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
  7686. .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
  7687. .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
  7688. .recover_open = nfs41_open_expired,
  7689. .recover_lock = nfs41_lock_expired,
  7690. .establish_clid = nfs41_init_clientid,
  7691. };
  7692. #endif /* CONFIG_NFS_V4_1 */
  7693. static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
  7694. .sched_state_renewal = nfs4_proc_async_renew,
  7695. .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
  7696. .renew_lease = nfs4_proc_renew,
  7697. };
  7698. #if defined(CONFIG_NFS_V4_1)
  7699. static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
  7700. .sched_state_renewal = nfs41_proc_async_sequence,
  7701. .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
  7702. .renew_lease = nfs4_proc_sequence,
  7703. };
  7704. #endif
  7705. static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
  7706. .get_locations = _nfs40_proc_get_locations,
  7707. .fsid_present = _nfs40_proc_fsid_present,
  7708. };
  7709. #if defined(CONFIG_NFS_V4_1)
  7710. static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
  7711. .get_locations = _nfs41_proc_get_locations,
  7712. .fsid_present = _nfs41_proc_fsid_present,
  7713. };
  7714. #endif /* CONFIG_NFS_V4_1 */
  7715. static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
  7716. .minor_version = 0,
  7717. .init_caps = NFS_CAP_READDIRPLUS
  7718. | NFS_CAP_ATOMIC_OPEN
  7719. | NFS_CAP_POSIX_LOCK,
  7720. .init_client = nfs40_init_client,
  7721. .shutdown_client = nfs40_shutdown_client,
  7722. .match_stateid = nfs4_match_stateid,
  7723. .find_root_sec = nfs4_find_root_sec,
  7724. .free_lock_state = nfs4_release_lockowner,
  7725. .alloc_seqid = nfs_alloc_seqid,
  7726. .call_sync_ops = &nfs40_call_sync_ops,
  7727. .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
  7728. .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
  7729. .state_renewal_ops = &nfs40_state_renewal_ops,
  7730. .mig_recovery_ops = &nfs40_mig_recovery_ops,
  7731. };
  7732. #if defined(CONFIG_NFS_V4_1)
  7733. static struct nfs_seqid *
  7734. nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2)
  7735. {
  7736. return NULL;
  7737. }
  7738. static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
  7739. .minor_version = 1,
  7740. .init_caps = NFS_CAP_READDIRPLUS
  7741. | NFS_CAP_ATOMIC_OPEN
  7742. | NFS_CAP_POSIX_LOCK
  7743. | NFS_CAP_STATEID_NFSV41
  7744. | NFS_CAP_ATOMIC_OPEN_V1,
  7745. .init_client = nfs41_init_client,
  7746. .shutdown_client = nfs41_shutdown_client,
  7747. .match_stateid = nfs41_match_stateid,
  7748. .find_root_sec = nfs41_find_root_sec,
  7749. .free_lock_state = nfs41_free_lock_state,
  7750. .alloc_seqid = nfs_alloc_no_seqid,
  7751. .call_sync_ops = &nfs41_call_sync_ops,
  7752. .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
  7753. .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
  7754. .state_renewal_ops = &nfs41_state_renewal_ops,
  7755. .mig_recovery_ops = &nfs41_mig_recovery_ops,
  7756. };
  7757. #endif
  7758. #if defined(CONFIG_NFS_V4_2)
  7759. static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
  7760. .minor_version = 2,
  7761. .init_caps = NFS_CAP_READDIRPLUS
  7762. | NFS_CAP_ATOMIC_OPEN
  7763. | NFS_CAP_POSIX_LOCK
  7764. | NFS_CAP_STATEID_NFSV41
  7765. | NFS_CAP_ATOMIC_OPEN_V1
  7766. | NFS_CAP_ALLOCATE
  7767. | NFS_CAP_DEALLOCATE
  7768. | NFS_CAP_SEEK
  7769. | NFS_CAP_LAYOUTSTATS,
  7770. .init_client = nfs41_init_client,
  7771. .shutdown_client = nfs41_shutdown_client,
  7772. .match_stateid = nfs41_match_stateid,
  7773. .find_root_sec = nfs41_find_root_sec,
  7774. .free_lock_state = nfs41_free_lock_state,
  7775. .call_sync_ops = &nfs41_call_sync_ops,
  7776. .alloc_seqid = nfs_alloc_no_seqid,
  7777. .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
  7778. .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
  7779. .state_renewal_ops = &nfs41_state_renewal_ops,
  7780. .mig_recovery_ops = &nfs41_mig_recovery_ops,
  7781. };
  7782. #endif
  7783. const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
  7784. [0] = &nfs_v4_0_minor_ops,
  7785. #if defined(CONFIG_NFS_V4_1)
  7786. [1] = &nfs_v4_1_minor_ops,
  7787. #endif
  7788. #if defined(CONFIG_NFS_V4_2)
  7789. [2] = &nfs_v4_2_minor_ops,
  7790. #endif
  7791. };
  7792. static const struct inode_operations nfs4_dir_inode_operations = {
  7793. .create = nfs_create,
  7794. .lookup = nfs_lookup,
  7795. .atomic_open = nfs_atomic_open,
  7796. .link = nfs_link,
  7797. .unlink = nfs_unlink,
  7798. .symlink = nfs_symlink,
  7799. .mkdir = nfs_mkdir,
  7800. .rmdir = nfs_rmdir,
  7801. .mknod = nfs_mknod,
  7802. .rename = nfs_rename,
  7803. .permission = nfs_permission,
  7804. .getattr = nfs_getattr,
  7805. .setattr = nfs_setattr,
  7806. .getxattr = generic_getxattr,
  7807. .setxattr = generic_setxattr,
  7808. .listxattr = generic_listxattr,
  7809. .removexattr = generic_removexattr,
  7810. };
  7811. static const struct inode_operations nfs4_file_inode_operations = {
  7812. .permission = nfs_permission,
  7813. .getattr = nfs_getattr,
  7814. .setattr = nfs_setattr,
  7815. .getxattr = generic_getxattr,
  7816. .setxattr = generic_setxattr,
  7817. .listxattr = generic_listxattr,
  7818. .removexattr = generic_removexattr,
  7819. };
  7820. const struct nfs_rpc_ops nfs_v4_clientops = {
  7821. .version = 4, /* protocol version */
  7822. .dentry_ops = &nfs4_dentry_operations,
  7823. .dir_inode_ops = &nfs4_dir_inode_operations,
  7824. .file_inode_ops = &nfs4_file_inode_operations,
  7825. .file_ops = &nfs4_file_operations,
  7826. .getroot = nfs4_proc_get_root,
  7827. .submount = nfs4_submount,
  7828. .try_mount = nfs4_try_mount,
  7829. .getattr = nfs4_proc_getattr,
  7830. .setattr = nfs4_proc_setattr,
  7831. .lookup = nfs4_proc_lookup,
  7832. .access = nfs4_proc_access,
  7833. .readlink = nfs4_proc_readlink,
  7834. .create = nfs4_proc_create,
  7835. .remove = nfs4_proc_remove,
  7836. .unlink_setup = nfs4_proc_unlink_setup,
  7837. .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
  7838. .unlink_done = nfs4_proc_unlink_done,
  7839. .rename_setup = nfs4_proc_rename_setup,
  7840. .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
  7841. .rename_done = nfs4_proc_rename_done,
  7842. .link = nfs4_proc_link,
  7843. .symlink = nfs4_proc_symlink,
  7844. .mkdir = nfs4_proc_mkdir,
  7845. .rmdir = nfs4_proc_remove,
  7846. .readdir = nfs4_proc_readdir,
  7847. .mknod = nfs4_proc_mknod,
  7848. .statfs = nfs4_proc_statfs,
  7849. .fsinfo = nfs4_proc_fsinfo,
  7850. .pathconf = nfs4_proc_pathconf,
  7851. .set_capabilities = nfs4_server_capabilities,
  7852. .decode_dirent = nfs4_decode_dirent,
  7853. .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare,
  7854. .read_setup = nfs4_proc_read_setup,
  7855. .read_done = nfs4_read_done,
  7856. .write_setup = nfs4_proc_write_setup,
  7857. .write_done = nfs4_write_done,
  7858. .commit_setup = nfs4_proc_commit_setup,
  7859. .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
  7860. .commit_done = nfs4_commit_done,
  7861. .lock = nfs4_proc_lock,
  7862. .clear_acl_cache = nfs4_zap_acl_attr,
  7863. .close_context = nfs4_close_context,
  7864. .open_context = nfs4_atomic_open,
  7865. .have_delegation = nfs4_have_delegation,
  7866. .return_delegation = nfs4_inode_return_delegation,
  7867. .alloc_client = nfs4_alloc_client,
  7868. .init_client = nfs4_init_client,
  7869. .free_client = nfs4_free_client,
  7870. .create_server = nfs4_create_server,
  7871. .clone_server = nfs_clone_server,
  7872. };
  7873. static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
  7874. .prefix = XATTR_NAME_NFSV4_ACL,
  7875. .list = nfs4_xattr_list_nfs4_acl,
  7876. .get = nfs4_xattr_get_nfs4_acl,
  7877. .set = nfs4_xattr_set_nfs4_acl,
  7878. };
  7879. const struct xattr_handler *nfs4_xattr_handlers[] = {
  7880. &nfs4_xattr_nfs4_acl_handler,
  7881. #ifdef CONFIG_NFS_V4_SECURITY_LABEL
  7882. &nfs4_xattr_nfs4_label_handler,
  7883. #endif
  7884. NULL
  7885. };
  7886. /*
  7887. * Local variables:
  7888. * c-basic-offset: 8
  7889. * End:
  7890. */