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@xxxxxxx>
---
fs/xfs/xfs_symlink.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++--
fs/xfs/xfs_symlink.h | 2 +-
fs/xfs/xfs_trace.h | 2 ++
fs/xfs/xfs_vnodeops.c | 15 +++------------
4 files changed, 53 insertions(+), 15 deletions(-)
Index: b/fs/xfs/xfs_symlink.c
===================================================================
--- a/fs/xfs/xfs_symlink.c
+++ b/fs/xfs/xfs_symlink.c
@@ -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 +720,48 @@ 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;
+ xfs_fsize_t pathlen;
+
+ trace_xfs_readlink(ip);
+
+ ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
+
+ if (XFS_FORCED_SHUTDOWN(mp))
+ return XFS_ERROR(EIO);
+
+ /*
+ * Zero length symlinks _can_ exist.
+ */
+ pathlen = ip->i_d.di_size;
+ if (!pathlen)
+ return 0;
+
+ if (pathlen < 0 || pathlen > MAXPATHLEN) {
+ xfs_alert(mp, "%s: inode (%llu) bad symlink length (%lld)",
+ __func__, (unsigned long long) ip->i_ino,
+ (long long) 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));
+}
Index: b/fs/xfs/xfs_symlink.h
===================================================================
--- a/fs/xfs/xfs_symlink.h
+++ b/fs/xfs/xfs_symlink.h
@@ -60,7 +60,7 @@ extern const struct xfs_buf_ops xfs_syml
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 */
Index: b/fs/xfs/xfs_trace.h
===================================================================
--- a/fs/xfs/xfs_trace.h
+++ b/fs/xfs/xfs_trace.h
@@ -594,6 +594,8 @@ DEFINE_INODE_EVENT(xfs_inode_set_eofbloc
DEFINE_INODE_EVENT(xfs_inode_clear_eofblocks_tag);
DEFINE_INODE_EVENT(xfs_inode_free_eofblocks_invalid);
+DEFINE_INODE_EVENT(xfs_symlink_inactive);
+
DECLARE_EVENT_CLASS(xfs_iref_class,
TP_PROTO(struct xfs_inode *ip, unsigned long caller_ip),
TP_ARGS(ip, caller_ip),
Index: b/fs/xfs/xfs_vnodeops.c
===================================================================
--- a/fs/xfs/xfs_vnodeops.c
+++ b/fs/xfs/xfs_vnodeops.c
@@ -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);
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