xfs: take the ilock around xfs_bmapi_read in xfs_zero_remaining_bytes

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Ben Myers <bpm@sgi.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/fs/xfs/xfs_bmap_util.c b/fs/xfs/xfs_bmap_util.c
index 374ba050942f..202a51f7c450 100644
--- a/fs/xfs/xfs_bmap_util.c
+++ b/fs/xfs/xfs_bmap_util.c
@@ -1173,9 +1173,15 @@ xfs_zero_remaining_bytes(
         xfs_buf_unlock(bp);
 
         for (offset = startoff; offset <= endoff; offset = lastoffset + 1) {
+                uint lock_mode;
+
                 offset_fsb = XFS_B_TO_FSBT(mp, offset);
                 nimap = 1;
+
+                lock_mode = xfs_ilock_data_map_shared(ip);
                 error = xfs_bmapi_read(ip, offset_fsb, 1, &imap, &nimap, 0);
+                xfs_iunlock(ip, lock_mode);
+
                 if (error || nimap < 1)
                         break;
                 ASSERT(imap.br_blockcount >= 1);