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xfs: xfs_iflush_cluster has range issues

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xfs_iflush_cluster() does a gang lookup on the radix tree, meaning
it can find inodes beyond the current cluster if there is sparse
cache population. gang lookups return results in ascending index
order, so stop trying to cluster inodes once the first inode outside
the cluster mask is detected.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Dave Chinner 2016-05-18 14:09:13 +10:00 • committed by Dave Chinner
parent 8a17d7dded
commit 5a90e53e81
1 changed files with 11 additions and 2 deletions
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13
fs/xfs/xfs_inode.c
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@ -3207,11 +3207,20 @@ xfs_iflush_cluster(
*/
spin_lock(&iq->i_flags_lock);
if (!iq->i_ino ||
__xfs_iflags_test(iq, XFS_ISTALE) ||
(XFS_INO_TO_AGINO(mp, iq->i_ino) & mask) != first_index) {
__xfs_iflags_test(iq, XFS_ISTALE)) {
spin_unlock(&iq->i_flags_lock);
continue;
}
/*
* Once we fall off the end of the cluster, no point checking
* any more inodes in the list because they will also all be
* outside the cluster.
*/
if ((XFS_INO_TO_AGINO(mp, iq->i_ino) & mask) != first_index) {
spin_unlock(&iq->i_flags_lock);
break;
}
spin_unlock(&iq->i_flags_lock);
/*