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[014/197] xfs: check for not fully initialized inodes in xfs_ireclaim

To: linux-kernel@xxxxxxxxxxxxxxx, stable@xxxxxxxxxx
Subject: [014/197] xfs: check for not fully initialized inodes in xfs_ireclaim
From: Greg KH <gregkh@xxxxxxx>
Date: Thu, 22 Apr 2010 12:07:45 -0700
Cc: stable-review@xxxxxxxxxx, torvalds@xxxxxxxxxxxxxxxxxxxx, akpm@xxxxxxxxxxxxxxxxxxxx, alan@xxxxxxxxxxxxxxxxxxx, xfs@xxxxxxxxxxx, Christoph Hellwig <hch@xxxxxx>, Alex Elder <aelder@xxxxxxx>
In-reply-to: <20100422191857.GA13268@xxxxxxxxx>
User-agent: quilt/0.48-4.4
2.6.32-stable review patch.  If anyone has any objections, please let us know.

------------------


From: Christoph Hellwig <hch@xxxxxxxxxxxxx>

commit b44b1126279b60597f96bbe77507b1650f88a969 upstream

Add an assert for inodes not added to the inode cache in xfs_ireclaim,
to make sure we're not going to introduce something like the
famous nfsd inode cache bug again.

Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Alex Elder <aelder@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
---
 fs/xfs/xfs_iget.c |   12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

--- a/fs/xfs/xfs_iget.c
+++ b/fs/xfs/xfs_iget.c
@@ -511,17 +511,21 @@ xfs_ireclaim(
 {
        struct xfs_mount        *mp = ip->i_mount;
        struct xfs_perag        *pag;
+       xfs_agino_t             agino = XFS_INO_TO_AGINO(mp, ip->i_ino);
 
        XFS_STATS_INC(xs_ig_reclaims);
 
        /*
-        * Remove the inode from the per-AG radix tree.  It doesn't matter
-        * if it was never added to it because radix_tree_delete can deal
-        * with that case just fine.
+        * Remove the inode from the per-AG radix tree.
+        *
+        * Because radix_tree_delete won't complain even if the item was never
+        * added to the tree assert that it's been there before to catch
+        * problems with the inode life time early on.
         */
        pag = xfs_get_perag(mp, ip->i_ino);
        write_lock(&pag->pag_ici_lock);
-       radix_tree_delete(&pag->pag_ici_root, XFS_INO_TO_AGINO(mp, ip->i_ino));
+       if (!radix_tree_delete(&pag->pag_ici_root, agino))
+               ASSERT(0);
        write_unlock(&pag->pag_ici_lock);
        xfs_put_perag(mp, pag);
 


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