[4/4] xfs: remove unnecessary flush of eof page from truncate

Commit Message

Brian Foster July 18, 2024, 1:02 p.m. UTC

The EOF flush was originally added to work around broken
iomap_zero_range() handling of dirty cache over unwritten extents.
Now that iomap handles this situation correctly, the flush can be
removed.

Signed-off-by: Brian Foster <[e-mail]>
---
 fs/xfs/xfs_iops.c | 10 ----------
 1 file changed, 10 deletions(-)

Patch

diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c
index ff222827e550..eb0b7a88776d 100644
--- a/fs/xfs/xfs_iops.c
+++ b/fs/xfs/xfs_iops.c
@@ -862,16 +862,6 @@  xfs_setattr_size(
 		error = xfs_zero_range(ip, oldsize, newsize - oldsize,
 				&did_zeroing);
 	} else {
-		/*
-		 * iomap won't detect a dirty page over an unwritten block (or a
-		 * cow block over a hole) and subsequently skips zeroing the
-		 * newly post-EOF portion of the page. Flush the new EOF to
-		 * convert the block before the pagecache truncate.
-		 */
-		error = filemap_write_and_wait_range(inode->i_mapping, newsize,
-						     newsize);
-		if (error)
-			return error;
 		error = xfs_truncate_page(ip, newsize, &did_zeroing);
 	}