From: Christoph Hellwig <hch@lst.de>
Date: Mon, 14 Oct 2019 17:07:21 +0000 (-0700)
Subject: xfs: ignore extent size hints for always COW inodes
X-Git-Tag: v5.10.7~3672^2~199
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=bdb2ed2dbdc227a97e8f37ecf0effc3537bcf789;p=platform%2Fkernel%2Flinux-rpi.git

xfs: ignore extent size hints for always COW inodes

There is no point in applying extent size hints for always COW inodes,
as we would just have to COW any extra allocation beyond the data
actually written.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
---

diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index 18f4b26..2e94deb 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -55,6 +55,12 @@ xfs_extlen_t
 xfs_get_extsz_hint(
 	struct xfs_inode	*ip)
 {
+	/*
+	 * No point in aligning allocations if we need to COW to actually
+	 * write to them.
+	 */
+	if (xfs_is_always_cow_inode(ip))
+		return 0;
 	if ((ip->i_d.di_flags & XFS_DIFLAG_EXTSIZE) && ip->i_d.di_extsize)
 		return ip->i_d.di_extsize;
 	if (XFS_IS_REALTIME_INODE(ip))