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authorMiklos Szeredi <mszeredi@suse.cz>2014-10-24 00:14:36 +0200
committerMiklos Szeredi <mszeredi@suse.cz>2014-10-24 00:14:36 +0200
commitcbdf35bcb833bfd00f0925d7a9a33a21f41ea582 (patch)
treefe76fb2eeaaf2b56d4961840caf97719567c6a88 /fs/btrfs
parentc771d683a62e5d36bc46036f5c07f4f5bb7dda61 (diff)
vfs: export check_sticky()
It's already duplicated in btrfs and about to be used in overlayfs too. Move the sticky bit check to an inline helper and call the out-of-line helper only in the unlikly case of the sticky bit being set. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Diffstat (limited to 'fs/btrfs')
-rw-r--r--fs/btrfs/ioctl.c20
1 files changed, 1 insertions, 19 deletions
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 8d2b76e29d3..4399f0c3a4c 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -765,23 +765,6 @@ out:
return ret;
}
-/* copy of check_sticky in fs/namei.c()
-* It's inline, so penalty for filesystems that don't use sticky bit is
-* minimal.
-*/
-static inline int btrfs_check_sticky(struct inode *dir, struct inode *inode)
-{
- kuid_t fsuid = current_fsuid();
-
- if (!(dir->i_mode & S_ISVTX))
- return 0;
- if (uid_eq(inode->i_uid, fsuid))
- return 0;
- if (uid_eq(dir->i_uid, fsuid))
- return 0;
- return !capable(CAP_FOWNER);
-}
-
/* copy of may_delete in fs/namei.c()
* Check whether we can remove a link victim from directory dir, check
* whether the type of victim is right.
@@ -817,8 +800,7 @@ static int btrfs_may_delete(struct inode *dir, struct dentry *victim, int isdir)
return error;
if (IS_APPEND(dir))
return -EPERM;
- if (btrfs_check_sticky(dir, victim->d_inode)||
- IS_APPEND(victim->d_inode)||
+ if (check_sticky(dir, victim->d_inode) || IS_APPEND(victim->d_inode) ||
IS_IMMUTABLE(victim->d_inode) || IS_SWAPFILE(victim->d_inode))
return -EPERM;
if (isdir) {