From: Darrick J. Wong <darrick.wong@oracle.com>
Date: Tue, 3 Nov 2020 01:14:07 +0000 (-0800)
Subject: xfs: only flush the unshared range in xfs_reflink_unshare
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=46afb0628b86347933b16ac966655f74eab65c8c;p=linux.git

xfs: only flush the unshared range in xfs_reflink_unshare

There's no reason to flush an entire file when we're unsharing part of
a file.  Therefore, only initiate writeback on the selected range.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Chandan Babu R <chandanrlinux@gmail.com>
---

diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c
index 16098dc42addb..6fa05fb78189b 100644
--- a/fs/xfs/xfs_reflink.c
+++ b/fs/xfs/xfs_reflink.c
@@ -1502,7 +1502,8 @@ xfs_reflink_unshare(
 			&xfs_buffered_write_iomap_ops);
 	if (error)
 		goto out;
-	error = filemap_write_and_wait(inode->i_mapping);
+
+	error = filemap_write_and_wait_range(inode->i_mapping, offset, len);
 	if (error)
 		goto out;