xfs: enable extent size hints for CoW operations

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>

diff --git a/libxfs/xfs_bmap.c b/libxfs/xfs_bmap.c
index 9c190ea6d19a2950581ea1f84abc68d909f68cab..6942cea80f491ab8bd3d52287cce587dce81ae3a 100644 (file)
--- a/libxfs/xfs_bmap.c
+++ b/libxfs/xfs_bmap.c
@@ -6574,7 +6574,13 @@ 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)