[PATCH] btrfs: support other sectorsizes in _scratch_mkfs_blocksized

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

When btrfs supports sectorsize != pagesize it can run these test cases
now,
generic/205 generic/206 generic/216 generic/217 generic/218 generic/220
generic/222 generic/227 generic/229 generic/238

This change is backward compatible for kernels without non pagesize
sectorsize support.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
---
RFC->v1:
  Fix path to the supported_sectorsizes path check if the file exists.
  Grep the word.

 common/rc | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/common/rc b/common/rc
index 919028eff41c..baa994e33553 100644
--- a/common/rc
+++ b/common/rc
@@ -1121,6 +1121,15 @@ _scratch_mkfs_blocksized()
     fi
 
     case $FSTYP in
+    btrfs)
+	test -f /sys/fs/btrfs/features/supported_sectorsizes || \
+		_notrun "Subpage sectorsize support is not found in $FSTYP"
+
+	grep -q \\b$blocksize\\b /sys/fs/btrfs/features/supported_sectorsizes || \
+		_notrun "$FSTYP does not support sectorsize=$blocksize yet"
+
+	_scratch_mkfs $MKFS_OPTIONS --sectorsize=$blocksize
+	;;
     xfs)
 	_scratch_mkfs_xfs $MKFS_OPTIONS -b size=$blocksize
 	;;
-- 
2.18.4