[PATCH v2 1/9] fstests: btrfs: _scratch_mkfs_sized fix min size without mixed option

[Anand Jain <anand.jain@oracle.com>]

As of now _scratch_mkfs_sized() checks if the requested size is below 1G
and forces the --mixed option for the mkfs.btrfs. Well the correct size
considering all possible group profiles at which we need to force the
mixed option is roughly 256Mbytes. So fix that.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
---
 common/rc | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/common/rc b/common/rc
index d5bb1feee2c3..90dc3002bc3d 100644
--- a/common/rc
+++ b/common/rc
@@ -969,7 +969,10 @@ _scratch_mkfs_sized()
 	;;
     btrfs)
 	local mixed_opt=
-	(( fssize <= 1024 * 1024 * 1024 )) && mixed_opt='--mixed'
+	# minimum size that's needed without the mixed option.
+	# Ref: btrfs-prog: btrfs_min_dev_size()
+	# Non mixed mode is also the default option.
+	(( fssize < $((256 * 1024 *1024)) )) && mixed_opt='--mixed'
 	$MKFS_BTRFS_PROG $MKFS_OPTIONS $mixed_opt -b $fssize $SCRATCH_DEV
 	;;
     jfs)
-- 
1.8.3.1