Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Index: xfs/fs/xfs/xfs_bmap_util.c
===================================================================
--- xfs.orig/fs/xfs/xfs_bmap_util.c 2013-12-06 19:37:36.715162723 +0100
+++ xfs/fs/xfs/xfs_bmap_util.c 2013-12-06 19:38:45.643161309 +0100
@@ -1175,9 +1175,15 @@ 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);
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