[PATCH 48/56] xfs: enable extent size hints for CoW operations

Darrick J. Wong
2025-02-06T22:47:39Z

Source kernel commit: 8e84e8052bc283ebb37f929eb9fb97483ea7385e

Wire up the copy-on-write extent size hint for realtime files, and
connect it to the rt allocator so that we avoid fragmentation on rt
filesystems.

Signed-off-by: "Darrick J. Wong" <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
libxfs/xfs_bmap.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/libxfs/xfs_bmap.c b/libxfs/xfs_bmap.c
index ed969983cccd1b..1f7326acbf7cb2 100644
--- a/libxfs/xfs_bmap.c
+++ b/libxfs/xfs_bmap.c
@@ -6518,7 +6518,13 @@ xfs_get_cowextsz_hint(
a = 0;
if (ip->i_diflags2 & XFS_DIFLAG2_COWEXTSIZE)
a = ip->i_cowextsize;
- b = xfs_get_extsz_hint(ip);
+ if (XFS_IS_REALTIME_INODE(ip)) {
+ b = 0;
+ if (ip->i_diflags & XFS_DIFLAG_EXTSIZE)
+ b = ip->i_extsize;
+ } else {
+ b = xfs_get_extsz_hint(ip);
+ }

a = max(a, b);
if (a == 0)