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 4.6-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-4.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 51b07f30a71c27405259a0248206ed4e22adbee2 Mon Sep 17 00:00:00 2001
From: Dave Chinner <dchinner@xxxxxxxxxx>
Date: Wed, 18 May 2016 13:54:22 +1000
Subject: xfs: fix inode validity check in xfs_iflush_cluster
From: Dave Chinner <dchinner@xxxxxxxxxx>
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 <dchinner@xxxxxxxxxx>
Discovered-by: Brain Foster <bfoster@xxxxxxxxxx>
Signed-off-by: Dave Chinner <dchinner@xxxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Dave Chinner <david@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/xfs/xfs_inode.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -3205,13 +3205,13 @@ 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 dchinner@xxxxxxxxxx are
queue-4.6/xfs-xfs_iflush_cluster-fails-to-abort-on-error.patch
queue-4.6/xfs-disallow-rw-remount-on-fs-with-unknown-ro-compat-features.patch
queue-4.6/xfs-fix-inode-validity-check-in-xfs_iflush_cluster.patch
queue-4.6/xfs-skip-stale-inodes-in-xfs_iflush_cluster.patch
queue-4.6/xfs-remove-xfs_fs_evict_inode.patch
queue-4.6/xfs-don-t-wrap-growfs-agfl-indexes.patch
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