Inode lockdep problem observed on 2.6.37.6 xfs with RT subvolume

Need some help understanding the state of xfs with rt subvolume support on 2.6.37.

When using xfs rt subvolume on a harddisk partition with kernel 2.6.37.6,and normal r/w/delete file operations causes deadlock like hangs . Failure symptoms are lockups and mount failure on reboot.

On further investigation it was found that one of the changes could be the cause.
The same tests seem to pass with xfs in 2.6.31 kernel.

xfs: simplify xfs_trans_iget :
http://git.kernel.org/?p=linux/kernel/git/stable/linux-stable.git;a=commitdiff;h=aa72a5cf00001d0b952c7c755be404b9118ceb2e
aa72a5cf00001d0b952c7c755be404b9118ceb2e

Reverting the change and forward porting to the xfs_trans_iget() seems to get rid of the deadlock and mount issues .

Below is the change

---
 linux-2.6.37/fs/xfs/xfs_trans_inode.c |   21 +++++++++++++++++++++
 1 files changed, 21 insertions(+), 0 deletions(-)

b/linux-2.6.37/fs/xfs/xfs_trans_inode.c
index ccb3453..c2861d5 100644

@@ -56,6 +56,27 @@ xfs_trans_iget(
        xfs_inode_t     **ipp)
 {
        int                     error;
+       xfs_inode_t     *ip = NULL;
+       xfs_perag_t     *pag = NULL;
+
+       /*
+       * If we find the inode in core with this transaction
+       * pointer in its i_transp field, then we know we already
+       * have it locked.
+       */
+       if(tp != NULL) {
+               pag = xfs_perag_get(mp,  XFS_INO_TO_AGNO(mp, ino));
+               read_lock(&pag->pag_ici_lock);
+               ip = radix_tree_lookup(&pag->pag_ici_root,

XFS_INO_TO_AGNO(mp, ino));
+ read_unlock(&pag->pag_ici_lock);
+ xfs_perag_put(pag);
+ }
+
+ /* the returned inode must match the transaction */
+ if (ip && (ip->i_transp == tp)) {
+ *ipp = ip;
+ return 0;
+ }

        error = xfs_iget(mp, tp, ino, flags, lock_flags, ipp);
        if (!error && tp) {

--
1.7.6

I have also attached the xfs_logprint text output when the mount fails.
http://old.nabble.com/file/p33246061/xfslog-2.6.37.6-mount-fail.txt
xfslog-2.6.37.6-mount-fail.txt

Regards
Kamal

View this message in context: http://old.nabble.com/Inode-lockdep-problem-observed-on-2.6.37.6-xfs-with-RT-subvolume-tp33246061p33246061.html
Sent from the Xfs - General mailing list archive at Nabble.com.

_______________________________________________
xfs mailing list
[email protected]
http://oss.sgi.com/mailman/listinfo/xfs