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-rw-r--r--fs/xfs/xfs_bmap_util.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/fs/xfs/xfs_bmap_util.c b/fs/xfs/xfs_bmap_util.c
index 2f1e30d39a35..76b6a2910e40 100644
--- a/fs/xfs/xfs_bmap_util.c
+++ b/fs/xfs/xfs_bmap_util.c
@@ -1470,6 +1470,19 @@ xfs_collapse_file_space(
start_fsb = XFS_B_TO_FSB(mp, offset + len);
shift_fsb = XFS_B_TO_FSB(mp, len);
+ /*
+ * writeback the entire file to prevent concurrent writeback of ranges
+ * outside the collapsing region from changing the extent list.
+ *
+ * XXX: This is a temporary fix until the extent shift loop below is
+ * converted to use offsets and lookups within the ILOCK rather than
+ * carrying around the index into the extent list for the next
+ * iteration.
+ */
+ error = filemap_write_and_wait(VFS_I(ip)->i_mapping);
+ if (error)
+ return error;
+
error = xfs_free_file_space(ip, offset, len);
if (error)
return error;
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