ceph: Fix up after semantic merge conflict

The previous ceph-client merge resulted in ceph not even building,
because there was a merge conflict that wasn't visible as an actual data
conflict: commit 7221fe4c2ed7 ("ceph: add acl for cephfs") added support
for POSIX ACL's into Ceph, but unluckily we also had the VFS tree change
a lot of the POSIX ACL helper functions to be much more helpful to
filesystems (see for example commits 2aeccbe957d0 "fs: add generic
xattr_acl handlers", 5bf3258fd2ac "fs: make posix_acl_chmod more useful"
and 37bc15392a23 "fs: make posix_acl_create more useful")

The reason this conflict wasn't obvious was many-fold: because it was a
semantic conflict rather than a data conflict, it wasn't visible in the
git merge as a conflict.  And because the VFS tree hadn't been in
linux-next, people hadn't become aware of it that way.  And because I
was at jury duty this morning, I was using my laptop and as a result not
doing constant "allmodconfig" builds.

Anyway, this fixes the build and generally removes a fair chunk of the
Ceph POSIX ACL support code, since the improved helpers seem to match
really well for Ceph too.  But I don't actually have any way to *test*
the end result, and I was really hoping for some ACK's for this.  Oh,
well.

Not compiling certainly doesn't make things easier to test, so I'm
committing this without the acks after having waited for four hours...
Plus it's what I would have done for the merge had I noticed the
semantic conflict..

Reported-by: Dave Jones <davej@redhat.com>
Cc: Sage Weil <sage@inktank.com>
Cc: Guangliang Zhao <lucienchao@gmail.com>
Cc: Li Wang <li.wang@ubuntykylin.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/ceph/acl.c

@@ -213,7 +213,7 @@ int ceph_init_acl(struct dentry *dentry, struct inode *inode, struct inode *dir)
 			if (ret)
 				goto out_release;
 		}
-		ret = posix_acl_create(&acl, GFP_NOFS, &inode->i_mode);
+		ret = __posix_acl_create(&acl, GFP_NOFS, &inode->i_mode);
 		if (ret < 0)
 			goto out;
 		else if (ret > 0)
@@ -229,104 +229,3 @@ out_release:
 out:
 	return ret;
 }
-
-int ceph_acl_chmod(struct dentry *dentry, struct inode *inode)
-{
-	struct posix_acl *acl;
-	int ret = 0;
-
-	if (S_ISLNK(inode->i_mode)) {
-		ret = -EOPNOTSUPP;
-		goto out;
-	}
-
-	if (!IS_POSIXACL(inode))
-		goto out;
-
-	acl = ceph_get_acl(inode, ACL_TYPE_ACCESS);
-	if (IS_ERR_OR_NULL(acl)) {
-		ret = PTR_ERR(acl);
-		goto out;
-	}
-
-	ret = posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
-	if (ret)
-		goto out;
-	ret = ceph_set_acl(dentry, inode, acl, ACL_TYPE_ACCESS);
-	posix_acl_release(acl);
-out:
-	return ret;
-}
-
-static int ceph_xattr_acl_get(struct dentry *dentry, const char *name,
-				void *value, size_t size, int type)
-{
-	struct posix_acl *acl;
-	int ret = 0;
-
-	if (!IS_POSIXACL(dentry->d_inode))
-		return -EOPNOTSUPP;
-
-	acl = ceph_get_acl(dentry->d_inode, type);
-	if (IS_ERR(acl))
-		return PTR_ERR(acl);
-	if (acl == NULL)
-		return -ENODATA;
-
-	ret = posix_acl_to_xattr(&init_user_ns, acl, value, size);
-	posix_acl_release(acl);
-
-	return ret;
-}
-
-static int ceph_xattr_acl_set(struct dentry *dentry, const char *name,
-			const void *value, size_t size, int flags, int type)
-{
-	int ret = 0;
-	struct posix_acl *acl = NULL;
-
-	if (!inode_owner_or_capable(dentry->d_inode)) {
-		ret = -EPERM;
-		goto out;
-	}
-
-	if (!IS_POSIXACL(dentry->d_inode)) {
-		ret = -EOPNOTSUPP;
-		goto out;
-	}
-
-	if (value) {
-		acl = posix_acl_from_xattr(&init_user_ns, value, size);
-		if (IS_ERR(acl)) {
-			ret = PTR_ERR(acl);
-			goto out;
-		}
-
-		if (acl) {
-			ret = posix_acl_valid(acl);
-			if (ret)
-				goto out_release;
-		}
-	}
-
-	ret = ceph_set_acl(dentry, dentry->d_inode, acl, type);
-
-out_release:
-	posix_acl_release(acl);
-out:
-	return ret;
-}
-
-const struct xattr_handler ceph_xattr_acl_default_handler = {
-	.prefix = POSIX_ACL_XATTR_DEFAULT,
-	.flags  = ACL_TYPE_DEFAULT,
-	.get    = ceph_xattr_acl_get,
-	.set    = ceph_xattr_acl_set,
-};
-
-const struct xattr_handler ceph_xattr_acl_access_handler = {
-	.prefix = POSIX_ACL_XATTR_ACCESS,
-	.flags  = ACL_TYPE_ACCESS,
-	.get    = ceph_xattr_acl_get,
-	.set    = ceph_xattr_acl_set,
-};

fs/ceph/inode.c

@@ -9,6 +9,7 @@
 #include <linux/namei.h>
 #include <linux/writeback.h>
 #include <linux/vmalloc.h>
+#include <linux/posix_acl.h>
 
 #include "super.h"
 #include "mds_client.h"
@@ -1805,7 +1806,7 @@ int ceph_setattr(struct dentry *dentry, struct iattr *attr)
 		__mark_inode_dirty(inode, inode_dirty_flags);
 
 	if (ia_valid & ATTR_MODE) {
-		err = ceph_acl_chmod(dentry, inode);
+		err = posix_acl_chmod(inode, attr->ia_mode);
 		if (err)
 			goto out_put;
 	}

fs/ceph/super.h

@@ -736,15 +736,12 @@ extern void __init ceph_xattr_init(void);
 extern void ceph_xattr_exit(void);
 
 /* acl.c */
-extern const struct xattr_handler ceph_xattr_acl_access_handler;
-extern const struct xattr_handler ceph_xattr_acl_default_handler;
 extern const struct xattr_handler *ceph_xattr_handlers[];
 
 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 
 struct posix_acl *ceph_get_acl(struct inode *, int);
 int ceph_init_acl(struct dentry *, struct inode *, struct inode *);
-int ceph_acl_chmod(struct dentry *, struct inode *);
 void ceph_forget_all_cached_acls(struct inode *inode);
 
 #else

fs/ceph/xattr.c

@@ -6,6 +6,7 @@
 #include <linux/ceph/decode.h>
 
 #include <linux/xattr.h>
+#include <linux/posix_acl_xattr.h>
 #include <linux/slab.h>
 
 #define XATTR_CEPH_PREFIX "ceph."
@@ -17,8 +18,8 @@
  */
 const struct xattr_handler *ceph_xattr_handlers[] = {
 #ifdef CONFIG_CEPH_FS_POSIX_ACL
-	&ceph_xattr_acl_access_handler,
-	&ceph_xattr_acl_default_handler,
+	&posix_acl_access_xattr_handler,
+	&posix_acl_default_xattr_handler,
 #endif
 	NULL,
 };