Patch "xfs: fix inode validity check in xfs_iflush_cluster" has been added to the 4.5-stable tree

This is a note to let you know that I've just added the patch titled

xfs: fix inode validity check in xfs_iflush_cluster

to the 4.5-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
xfs-fix-inode-validity-check-in-xfs_iflush_cluster.patch
and it can be found in the queue-4.5 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Dave Chinner <[email protected]>
Date: Wed, 18 May 2016 13:54:22 +1000
Subject: xfs: fix inode validity check in xfs_iflush_cluster

From: Dave Chinner <[email protected]>

commit 51b07f30a71c27405259a0248206ed4e22adbee2 upstream.

Some careless idiot(*) wrote crap code in commit 1a3e8f3 ("xfs:
convert inode cache lookups to use RCU locking") back in late 2010, and so xfs_iflush_cluster checks the wrong inode for whether it is still valid under RCU protection. Fix it to lock and check the correct inode.

(*) Careless-idiot: Dave Chinner <[email protected]>

---
 fs/xfs/xfs_inode.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

@@ -3225,13 +3225,13 @@ xfs_iflush_cluster(
 		 * We need to check under the i_flags_lock for a valid inode
 		 * here. Skip it if it is not valid or the wrong inode.
 		 */
-		spin_lock(&ip->i_flags_lock);
-		if (!ip->i_ino ||
+		spin_lock(&iq->i_flags_lock);
+		if (!iq->i_ino ||
 		    (XFS_INO_TO_AGINO(mp, iq->i_ino) & mask) != first_index) {
-			spin_unlock(&ip->i_flags_lock);
+			spin_unlock(&iq->i_flags_lock);
 			continue;
 		}
-		spin_unlock(&ip->i_flags_lock);
+		spin_unlock(&iq->i_flags_lock);
 
 		/*
 		 * Do an un-protected check to see if the inode is dirty and

Patches currently in stable-queue which might be from [email protected] are

queue-4.5/xfs-xfs_iflush_cluster-fails-to-abort-on-error.patch queue-4.5/xfs-disallow-rw-remount-on-fs-with-unknown-ro-compat-features.patch queue-4.5/xfs-fix-inode-validity-check-in-xfs_iflush_cluster.patch queue-4.5/xfs-skip-stale-inodes-in-xfs_iflush_cluster.patch queue-4.5/xfs-don-t-wrap-growfs-agfl-indexes.patch