|
|
@@ -0,0 +1,322 @@
|
|
|
+/*
|
|
|
+ * Copyright (c) 2014 Christoph Hellwig.
|
|
|
+ */
|
|
|
+#include "xfs.h"
|
|
|
+#include "xfs_format.h"
|
|
|
+#include "xfs_log_format.h"
|
|
|
+#include "xfs_trans_resv.h"
|
|
|
+#include "xfs_sb.h"
|
|
|
+#include "xfs_mount.h"
|
|
|
+#include "xfs_inode.h"
|
|
|
+#include "xfs_trans.h"
|
|
|
+#include "xfs_log.h"
|
|
|
+#include "xfs_bmap.h"
|
|
|
+#include "xfs_bmap_util.h"
|
|
|
+#include "xfs_error.h"
|
|
|
+#include "xfs_iomap.h"
|
|
|
+#include "xfs_shared.h"
|
|
|
+#include "xfs_bit.h"
|
|
|
+#include "xfs_pnfs.h"
|
|
|
+
|
|
|
+/*
|
|
|
+ * Ensure that we do not have any outstanding pNFS layouts that can be used by
|
|
|
+ * clients to directly read from or write to this inode. This must be called
|
|
|
+ * before every operation that can remove blocks from the extent map.
|
|
|
+ * Additionally we call it during the write operation, where aren't concerned
|
|
|
+ * about exposing unallocated blocks but just want to provide basic
|
|
|
+ * synchronization between a local writer and pNFS clients. mmap writes would
|
|
|
+ * also benefit from this sort of synchronization, but due to the tricky locking
|
|
|
+ * rules in the page fault path we don't bother.
|
|
|
+ */
|
|
|
+int
|
|
|
+xfs_break_layouts(
|
|
|
+ struct inode *inode,
|
|
|
+ uint *iolock)
|
|
|
+{
|
|
|
+ struct xfs_inode *ip = XFS_I(inode);
|
|
|
+ int error;
|
|
|
+
|
|
|
+ ASSERT(xfs_isilocked(ip, XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL));
|
|
|
+
|
|
|
+ while ((error = break_layout(inode, false) == -EWOULDBLOCK)) {
|
|
|
+ xfs_iunlock(ip, *iolock);
|
|
|
+ error = break_layout(inode, true);
|
|
|
+ *iolock = XFS_IOLOCK_EXCL;
|
|
|
+ xfs_ilock(ip, *iolock);
|
|
|
+ }
|
|
|
+
|
|
|
+ return error;
|
|
|
+}
|
|
|
+
|
|
|
+/*
|
|
|
+ * Get a unique ID including its location so that the client can identify
|
|
|
+ * the exported device.
|
|
|
+ */
|
|
|
+int
|
|
|
+xfs_fs_get_uuid(
|
|
|
+ struct super_block *sb,
|
|
|
+ u8 *buf,
|
|
|
+ u32 *len,
|
|
|
+ u64 *offset)
|
|
|
+{
|
|
|
+ struct xfs_mount *mp = XFS_M(sb);
|
|
|
+
|
|
|
+ printk_once(KERN_NOTICE
|
|
|
+"XFS (%s): using experimental pNFS feature, use at your own risk!\n",
|
|
|
+ mp->m_fsname);
|
|
|
+
|
|
|
+ if (*len < sizeof(uuid_t))
|
|
|
+ return -EINVAL;
|
|
|
+
|
|
|
+ memcpy(buf, &mp->m_sb.sb_uuid, sizeof(uuid_t));
|
|
|
+ *len = sizeof(uuid_t);
|
|
|
+ *offset = offsetof(struct xfs_dsb, sb_uuid);
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static void
|
|
|
+xfs_bmbt_to_iomap(
|
|
|
+ struct xfs_inode *ip,
|
|
|
+ struct iomap *iomap,
|
|
|
+ struct xfs_bmbt_irec *imap)
|
|
|
+{
|
|
|
+ struct xfs_mount *mp = ip->i_mount;
|
|
|
+
|
|
|
+ if (imap->br_startblock == HOLESTARTBLOCK) {
|
|
|
+ iomap->blkno = IOMAP_NULL_BLOCK;
|
|
|
+ iomap->type = IOMAP_HOLE;
|
|
|
+ } else if (imap->br_startblock == DELAYSTARTBLOCK) {
|
|
|
+ iomap->blkno = IOMAP_NULL_BLOCK;
|
|
|
+ iomap->type = IOMAP_DELALLOC;
|
|
|
+ } else {
|
|
|
+ iomap->blkno =
|
|
|
+ XFS_FSB_TO_DADDR(ip->i_mount, imap->br_startblock);
|
|
|
+ if (imap->br_state == XFS_EXT_UNWRITTEN)
|
|
|
+ iomap->type = IOMAP_UNWRITTEN;
|
|
|
+ else
|
|
|
+ iomap->type = IOMAP_MAPPED;
|
|
|
+ }
|
|
|
+ iomap->offset = XFS_FSB_TO_B(mp, imap->br_startoff);
|
|
|
+ iomap->length = XFS_FSB_TO_B(mp, imap->br_blockcount);
|
|
|
+}
|
|
|
+
|
|
|
+/*
|
|
|
+ * Get a layout for the pNFS client.
|
|
|
+ */
|
|
|
+int
|
|
|
+xfs_fs_map_blocks(
|
|
|
+ struct inode *inode,
|
|
|
+ loff_t offset,
|
|
|
+ u64 length,
|
|
|
+ struct iomap *iomap,
|
|
|
+ bool write,
|
|
|
+ u32 *device_generation)
|
|
|
+{
|
|
|
+ struct xfs_inode *ip = XFS_I(inode);
|
|
|
+ struct xfs_mount *mp = ip->i_mount;
|
|
|
+ struct xfs_bmbt_irec imap;
|
|
|
+ xfs_fileoff_t offset_fsb, end_fsb;
|
|
|
+ loff_t limit;
|
|
|
+ int bmapi_flags = XFS_BMAPI_ENTIRE;
|
|
|
+ int nimaps = 1;
|
|
|
+ uint lock_flags;
|
|
|
+ int error = 0;
|
|
|
+
|
|
|
+ if (XFS_FORCED_SHUTDOWN(mp))
|
|
|
+ return -EIO;
|
|
|
+
|
|
|
+ /*
|
|
|
+ * We can't export inodes residing on the realtime device. The realtime
|
|
|
+ * device doesn't have a UUID to identify it, so the client has no way
|
|
|
+ * to find it.
|
|
|
+ */
|
|
|
+ if (XFS_IS_REALTIME_INODE(ip))
|
|
|
+ return -ENXIO;
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Lock out any other I/O before we flush and invalidate the pagecache,
|
|
|
+ * and then hand out a layout to the remote system. This is very
|
|
|
+ * similar to direct I/O, except that the synchronization is much more
|
|
|
+ * complicated. See the comment near xfs_break_layouts for a detailed
|
|
|
+ * explanation.
|
|
|
+ */
|
|
|
+ xfs_ilock(ip, XFS_IOLOCK_EXCL);
|
|
|
+
|
|
|
+ error = -EINVAL;
|
|
|
+ limit = mp->m_super->s_maxbytes;
|
|
|
+ if (!write)
|
|
|
+ limit = max(limit, round_up(i_size_read(inode),
|
|
|
+ inode->i_sb->s_blocksize));
|
|
|
+ if (offset > limit)
|
|
|
+ goto out_unlock;
|
|
|
+ if (offset > limit - length)
|
|
|
+ length = limit - offset;
|
|
|
+
|
|
|
+ error = filemap_write_and_wait(inode->i_mapping);
|
|
|
+ if (error)
|
|
|
+ goto out_unlock;
|
|
|
+ error = invalidate_inode_pages2(inode->i_mapping);
|
|
|
+ if (WARN_ON_ONCE(error))
|
|
|
+ return error;
|
|
|
+
|
|
|
+ end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + length);
|
|
|
+ offset_fsb = XFS_B_TO_FSBT(mp, offset);
|
|
|
+
|
|
|
+ lock_flags = xfs_ilock_data_map_shared(ip);
|
|
|
+ error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb,
|
|
|
+ &imap, &nimaps, bmapi_flags);
|
|
|
+ xfs_iunlock(ip, lock_flags);
|
|
|
+
|
|
|
+ if (error)
|
|
|
+ goto out_unlock;
|
|
|
+
|
|
|
+ if (write) {
|
|
|
+ enum xfs_prealloc_flags flags = 0;
|
|
|
+
|
|
|
+ ASSERT(imap.br_startblock != DELAYSTARTBLOCK);
|
|
|
+
|
|
|
+ if (!nimaps || imap.br_startblock == HOLESTARTBLOCK) {
|
|
|
+ error = xfs_iomap_write_direct(ip, offset, length,
|
|
|
+ &imap, nimaps);
|
|
|
+ if (error)
|
|
|
+ goto out_unlock;
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Ensure the next transaction is committed
|
|
|
+ * synchronously so that the blocks allocated and
|
|
|
+ * handed out to the client are guaranteed to be
|
|
|
+ * present even after a server crash.
|
|
|
+ */
|
|
|
+ flags |= XFS_PREALLOC_SET | XFS_PREALLOC_SYNC;
|
|
|
+ }
|
|
|
+
|
|
|
+ error = xfs_update_prealloc_flags(ip, flags);
|
|
|
+ if (error)
|
|
|
+ goto out_unlock;
|
|
|
+ }
|
|
|
+ xfs_iunlock(ip, XFS_IOLOCK_EXCL);
|
|
|
+
|
|
|
+ xfs_bmbt_to_iomap(ip, iomap, &imap);
|
|
|
+ *device_generation = mp->m_generation;
|
|
|
+ return error;
|
|
|
+out_unlock:
|
|
|
+ xfs_iunlock(ip, XFS_IOLOCK_EXCL);
|
|
|
+ return error;
|
|
|
+}
|
|
|
+
|
|
|
+/*
|
|
|
+ * Ensure the size update falls into a valid allocated block.
|
|
|
+ */
|
|
|
+static int
|
|
|
+xfs_pnfs_validate_isize(
|
|
|
+ struct xfs_inode *ip,
|
|
|
+ xfs_off_t isize)
|
|
|
+{
|
|
|
+ struct xfs_bmbt_irec imap;
|
|
|
+ int nimaps = 1;
|
|
|
+ int error = 0;
|
|
|
+
|
|
|
+ xfs_ilock(ip, XFS_ILOCK_SHARED);
|
|
|
+ error = xfs_bmapi_read(ip, XFS_B_TO_FSBT(ip->i_mount, isize - 1), 1,
|
|
|
+ &imap, &nimaps, 0);
|
|
|
+ xfs_iunlock(ip, XFS_ILOCK_SHARED);
|
|
|
+ if (error)
|
|
|
+ return error;
|
|
|
+
|
|
|
+ if (imap.br_startblock == HOLESTARTBLOCK ||
|
|
|
+ imap.br_startblock == DELAYSTARTBLOCK ||
|
|
|
+ imap.br_state == XFS_EXT_UNWRITTEN)
|
|
|
+ return -EIO;
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+/*
|
|
|
+ * Make sure the blocks described by maps are stable on disk. This includes
|
|
|
+ * converting any unwritten extents, flushing the disk cache and updating the
|
|
|
+ * time stamps.
|
|
|
+ *
|
|
|
+ * Note that we rely on the caller to always send us a timestamp update so that
|
|
|
+ * we always commit a transaction here. If that stops being true we will have
|
|
|
+ * to manually flush the cache here similar to what the fsync code path does
|
|
|
+ * for datasyncs on files that have no dirty metadata.
|
|
|
+ */
|
|
|
+int
|
|
|
+xfs_fs_commit_blocks(
|
|
|
+ struct inode *inode,
|
|
|
+ struct iomap *maps,
|
|
|
+ int nr_maps,
|
|
|
+ struct iattr *iattr)
|
|
|
+{
|
|
|
+ struct xfs_inode *ip = XFS_I(inode);
|
|
|
+ struct xfs_mount *mp = ip->i_mount;
|
|
|
+ struct xfs_trans *tp;
|
|
|
+ bool update_isize = false;
|
|
|
+ int error, i;
|
|
|
+ loff_t size;
|
|
|
+
|
|
|
+ ASSERT(iattr->ia_valid & (ATTR_ATIME|ATTR_CTIME|ATTR_MTIME));
|
|
|
+
|
|
|
+ xfs_ilock(ip, XFS_IOLOCK_EXCL);
|
|
|
+
|
|
|
+ size = i_size_read(inode);
|
|
|
+ if ((iattr->ia_valid & ATTR_SIZE) && iattr->ia_size > size) {
|
|
|
+ update_isize = true;
|
|
|
+ size = iattr->ia_size;
|
|
|
+ }
|
|
|
+
|
|
|
+ for (i = 0; i < nr_maps; i++) {
|
|
|
+ u64 start, length, end;
|
|
|
+
|
|
|
+ start = maps[i].offset;
|
|
|
+ if (start > size)
|
|
|
+ continue;
|
|
|
+
|
|
|
+ end = start + maps[i].length;
|
|
|
+ if (end > size)
|
|
|
+ end = size;
|
|
|
+
|
|
|
+ length = end - start;
|
|
|
+ if (!length)
|
|
|
+ continue;
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Make sure reads through the pagecache see the new data.
|
|
|
+ */
|
|
|
+ error = invalidate_inode_pages2_range(inode->i_mapping,
|
|
|
+ start >> PAGE_CACHE_SHIFT,
|
|
|
+ (end - 1) >> PAGE_CACHE_SHIFT);
|
|
|
+ WARN_ON_ONCE(error);
|
|
|
+
|
|
|
+ error = xfs_iomap_write_unwritten(ip, start, length);
|
|
|
+ if (error)
|
|
|
+ goto out_drop_iolock;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (update_isize) {
|
|
|
+ error = xfs_pnfs_validate_isize(ip, size);
|
|
|
+ if (error)
|
|
|
+ goto out_drop_iolock;
|
|
|
+ }
|
|
|
+
|
|
|
+ tp = xfs_trans_alloc(mp, XFS_TRANS_SETATTR_NOT_SIZE);
|
|
|
+ error = xfs_trans_reserve(tp, &M_RES(mp)->tr_ichange, 0, 0);
|
|
|
+ if (error)
|
|
|
+ goto out_drop_iolock;
|
|
|
+
|
|
|
+ xfs_ilock(ip, XFS_ILOCK_EXCL);
|
|
|
+ xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
|
|
|
+ xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
|
|
|
+
|
|
|
+ xfs_setattr_time(ip, iattr);
|
|
|
+ if (update_isize) {
|
|
|
+ i_size_write(inode, iattr->ia_size);
|
|
|
+ ip->i_d.di_size = iattr->ia_size;
|
|
|
+ }
|
|
|
+
|
|
|
+ xfs_trans_set_sync(tp);
|
|
|
+ error = xfs_trans_commit(tp, 0);
|
|
|
+
|
|
|
+out_drop_iolock:
|
|
|
+ xfs_iunlock(ip, XFS_IOLOCK_EXCL);
|
|
|
+ return error;
|
|
|
+}
|
Linus Torvalds