xfs: zeroing space needs to punch delalloc blocks

When we are zeroing space andit is covered by a delalloc range, we
need to punch the delalloc range out before we truncate the page
cache. Failing to do so leaves and inconsistency between the page
cache and the extent tree, which we later trip over when doing
direct IO over the same range.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Tested-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dave Chinner <david@fromorbit.com>

2 files changed, 13 insertions, 1 deletions

diff --git a/fs/xfs/xfs_bmap_util.c b/fs/xfs/xfs_bmap_util.c
index 01f6a646caa1..296160b8e78c 100644
--- a/fs/xfs/xfs_bmap_util.c
+++ b/fs/xfs/xfs_bmap_util.c
@@ -1418,6 +1418,8 @@ xfs_zero_file_space(
         xfs_off_t               end_boundary;
         int                     error;
 
+        trace_xfs_zero_file_space(ip);
+
         granularity = max_t(uint, 1 << mp->m_sb.sb_blocklog, PAGE_CACHE_SIZE);
 
         /*
@@ -1432,9 +1434,18 @@ xfs_zero_file_space(
         ASSERT(end_boundary <= offset + len);
 
         if (start_boundary < end_boundary - 1) {
-                /* punch out the page cache over the conversion range */
+                /*
+                 * punch out delayed allocation blocks and the page cache over
+                 * the conversion range
+                 */
+                xfs_ilock(ip, XFS_ILOCK_EXCL);
+                error = xfs_bmap_punch_delalloc_range(ip,
+                                XFS_B_TO_FSBT(mp, start_boundary),
+                                XFS_B_TO_FSB(mp, end_boundary - start_boundary));
+                xfs_iunlock(ip, XFS_ILOCK_EXCL);
                 truncate_pagecache_range(VFS_I(ip), start_boundary,
                                          end_boundary - 1);
+
                 /* convert the blocks */
                 error = xfs_alloc_file_space(ip, start_boundary,
                                         end_boundary - start_boundary - 1,
diff --git a/fs/xfs/xfs_trace.h b/fs/xfs/xfs_trace.h
index a4ae41c179a8..65d8c793a25c 100644
--- a/fs/xfs/xfs_trace.h
+++ b/fs/xfs/xfs_trace.h
@@ -603,6 +603,7 @@ DEFINE_INODE_EVENT(xfs_readlink);
 DEFINE_INODE_EVENT(xfs_inactive_symlink);
 DEFINE_INODE_EVENT(xfs_alloc_file_space);
 DEFINE_INODE_EVENT(xfs_free_file_space);
+DEFINE_INODE_EVENT(xfs_zero_file_space);
 DEFINE_INODE_EVENT(xfs_collapse_file_space);
 DEFINE_INODE_EVENT(xfs_readdir);
 #ifdef CONFIG_XFS_POSIX_ACL