xfs: check for not fully initialized inodes in xfs_ireclaim

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@lst.de>
Signed-off-by: Alex Elder <aelder@sgi.com>

1 files changed, 8 insertions, 4 deletions

diff --git a/fs/xfs/xfs_iget.c b/fs/xfs/xfs_iget.c
index f5c904a10c11..0de36c2a46f1 100644
--- a/fs/xfs/xfs_iget.c
+++ b/fs/xfs/xfs_iget.c
@@ -478,17 +478,21 @@ 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);