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xfs: fix the symbolic link assert in xfs_ifree

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Adding an extended attribute to a symbolic link can force that
link to an remote extent. xfs_inactive() incorrectly assumes
that any symbolic link small enough to be in the inode core
is incore, resulting in the remote extent to not be removed.
xfs_ifree() will assert on presence of this leaked remote extent.

Signed-off-by: Mark Tinguely <tinguely@sgi.com>
Reviewed-by: Ben Myers <bpm@sgi.com>
Signed-off-by: Ben Myers <bpm@sgi.com>
This commit is contained in:
Mark Tinguely 2013-06-17 15:35:57 -05:00 committed by Ben Myers
parent 1ebdf3611c
commit 725eb1eb2a
4 changed files with 51 additions and 15 deletions
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48
fs/xfs/xfs_symlink.c
View File

@ -585,7 +585,7 @@ xfs_symlink(
/*
* Free a symlink that has blocks associated with it.
*/
int
STATIC int
xfs_inactive_symlink_rmt(
xfs_inode_t *ip,
xfs_trans_t **tpp)
@ -606,7 +606,7 @@ xfs_inactive_symlink_rmt(
tp = *tpp;
mp = ip->i_mount;
ASSERT(ip->i_d.di_size > XFS_IFORK_DSIZE(ip));
ASSERT(ip->i_df.if_flags & XFS_IFEXTENTS);
/*
* We're freeing a symlink that has some
* blocks allocated to it. Free the
@ -720,3 +720,47 @@ xfs_inactive_symlink_rmt(
error0:
return error;
}
/*
* xfs_inactive_symlink - free a symlink
*/
int
xfs_inactive_symlink(
struct xfs_inode *ip,
struct xfs_trans **tp)
{
struct xfs_mount *mp = ip->i_mount;
int pathlen;
trace_xfs_inactive_symlink(ip);
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
if (XFS_FORCED_SHUTDOWN(mp))
return XFS_ERROR(EIO);
/*
* Zero length symlinks _can_ exist.
*/
pathlen = (int)ip->i_d.di_size;
if (!pathlen)
return 0;
if (pathlen < 0 || pathlen > MAXPATHLEN) {
xfs_alert(mp, "%s: inode (0x%llx) bad symlink length (%d)",
__func__, (unsigned long long)ip->i_ino, pathlen);
ASSERT(0);
return XFS_ERROR(EFSCORRUPTED);
}
if (ip->i_df.if_flags & XFS_IFINLINE) {
if (ip->i_df.if_bytes > 0)
xfs_idata_realloc(ip, -(ip->i_df.if_bytes),
XFS_DATA_FORK);
ASSERT(ip->i_df.if_bytes == 0);
return 0;
}
/* remove the remote symlink */
return xfs_inactive_symlink_rmt(ip, tp);
}

2
fs/xfs/xfs_symlink.h
View File

@ -60,7 +60,7 @@ extern const struct xfs_buf_ops xfs_symlink_buf_ops;
int xfs_symlink(struct xfs_inode *dp, struct xfs_name *link_name,
const char *target_path, umode_t mode, struct xfs_inode **ipp);
int xfs_readlink(struct xfs_inode *ip, char *link);
int xfs_inactive_symlink_rmt(struct xfs_inode *ip, struct xfs_trans **tpp);
int xfs_inactive_symlink(struct xfs_inode *ip, struct xfs_trans **tpp);
#endif /* __KERNEL__ */
#endif /* __XFS_SYMLINK_H */

1
fs/xfs/xfs_trace.h
View File

@ -571,6 +571,7 @@ DEFINE_INODE_EVENT(xfs_iget_miss);
DEFINE_INODE_EVENT(xfs_getattr);
DEFINE_INODE_EVENT(xfs_setattr);
DEFINE_INODE_EVENT(xfs_readlink);
DEFINE_INODE_EVENT(xfs_inactive_symlink);
DEFINE_INODE_EVENT(xfs_alloc_file_space);
DEFINE_INODE_EVENT(xfs_free_file_space);
DEFINE_INODE_EVENT(xfs_readdir);

15
fs/xfs/xfs_vnodeops.c
View File

@ -322,18 +322,9 @@ xfs_inactive(
xfs_trans_ijoin(tp, ip, 0);
if (S_ISLNK(ip->i_d.di_mode)) {
/*
* Zero length symlinks _can_ exist.
*/
if (ip->i_d.di_size > XFS_IFORK_DSIZE(ip)) {
error = xfs_inactive_symlink_rmt(ip, &tp);
if (error)
goto out_cancel;
} else if (ip->i_df.if_bytes > 0) {
xfs_idata_realloc(ip, -(ip->i_df.if_bytes),
XFS_DATA_FORK);
ASSERT(ip->i_df.if_bytes == 0);
}
error = xfs_inactive_symlink(ip, &tp);
if (error)
goto out_cancel;
} else if (truncate) {
ip->i_d.di_size = 0;
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);