btrfs: introduce helper for creating cloned devices with mkfs
Use newer mkfs.btrfs option to generate two cloned devices,
used in test cases.
Reviewed-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Anand Jain <anand.jain@oracle.com>
diff --git a/common/btrfs b/common/btrfs
index fe6fc21..7141a0b 100644
--- a/common/btrfs
+++ b/common/btrfs
@@ -843,3 +843,26 @@
echo -e -n "Tempfsid status:\t"
cat /sys/fs/btrfs/$tempfsid/temp_fsid
}
+
+mkfs_clone()
+{
+ local fsid
+ local uuid
+ local dev1=$1
+ local dev2=$2
+
+ _require_btrfs_command inspect-internal dump-super
+ _require_btrfs_mkfs_uuid_option
+
+ [[ -z $dev1 || -z $dev2 ]] && \
+ _fail "mkfs_clone requires two devices as arguments"
+
+ _mkfs_dev -fq $dev1
+
+ fsid=$($BTRFS_UTIL_PROG inspect-internal dump-super $dev1 | \
+ grep -E ^fsid | $AWK_PROG '{print $2}')
+ uuid=$($BTRFS_UTIL_PROG inspect-internal dump-super $dev1 | \
+ grep -E ^dev_item.uuid | $AWK_PROG '{print $2}')
+
+ _mkfs_dev -fq --uuid $fsid --device-uuid $uuid $dev2
+}
