[GFS2] Fix change nlink deadlock
Bugzilla 215088
Fix deadlock in gfs2_change_nlink() while installing RHEL5 into GFS2
partition. The gfs2_rename() apparently needs block allocation for the
new name (into the directory) where it requires rg locks. At the same
time, while updating the nlink count for the replaced file,
gfs2_change_nlink() tries to return the inode meta-data back to resource
group where it needs rg locks too. Our logic doesn't allow process to
acquire these locks recursively by the same process (RHEL installer)
that results a BUG call. This only happens within rename code path and
only if the destination file exists before the rename operation.
Signed-off-by: S. Wendy Cheng <wcheng@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c
index d122074c..6bc4436 100644
--- a/fs/gfs2/inode.c
+++ b/fs/gfs2/inode.c
@@ -281,16 +281,14 @@
}
/**
- * gfs2_change_nlink - Change nlink count on inode
+ * gfs2_change_nlink_i - Change nlink count on inode
* @ip: The GFS2 inode
* @diff: The change in the nlink count required
*
* Returns: errno
*/
-
-int gfs2_change_nlink(struct gfs2_inode *ip, int diff)
+int gfs2_change_nlink_i(struct gfs2_inode *ip, int diff)
{
- struct gfs2_sbd *sdp = ip->i_inode.i_sb->s_fs_info;
struct buffer_head *dibh;
u32 nlink;
int error;
@@ -322,6 +320,20 @@
brelse(dibh);
mark_inode_dirty(&ip->i_inode);
+ return error;
+}
+
+int gfs2_change_nlink(struct gfs2_inode *ip, int diff)
+{
+ struct gfs2_sbd *sdp = ip->i_inode.i_sb->s_fs_info;
+ int error;
+
+ /* update the nlink */
+ error = gfs2_change_nlink_i(ip, diff);
+ if (error)
+ return error;
+
+ /* return meta data block back to rg */
if (ip->i_inode.i_nlink == 0) {
struct gfs2_rgrpd *rgd;
struct gfs2_holder ri_gh, rg_gh;