btrfs: create a helper function, check_fsid(), to verify the tempfsid

check_fsid() provides a method to verify if the given device is mounted
with the tempfsid in the kernel. Function sb() is an internal only
function.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: Filipe Manana <fdmanana@suse.com>

diff --git a/common/btrfs b/common/btrfs
index e1b29c61376712c8c303a3bd71a47793175c1e8d..5dd0f705fd90ab0ed08faac4ed0c4af09e4430f9 100644 (file)
--- a/common/btrfs
+++ b/common/btrfs
@@ -792,3 +792,43 @@ _has_btrfs_sysfs_feature_attr()
 
        test -e /sys/fs/btrfs/features/$feature_attr
 }
+
+# Print the fsid and metadata uuid replaced with constant strings FSID and
+# METADATA_UUID. Compare temp_fsid with fsid and metadata_uuid, then echo what
+# it matches to or TEMP_FSID. This helps in comparing with the golden output.
+check_fsid()
+{
+       local dev1=$1
+       local fsid
+       local metadata_uuid
+
+       _require_btrfs_fs_sysfs
+       _require_btrfs_fs_feature temp_fsid
+       _require_btrfs_fs_feature metadata_uuid
+       _require_btrfs_command inspect-internal dump-super
+
+       # on disk fsid
+       fsid=$($BTRFS_UTIL_PROG inspect-internal dump-super $dev1 | \
+                               grep ^fsid | $AWK_PROG -d" " '{print $2}')
+       echo -e "On disk fsid:\t\t$fsid" | sed -e "s/$fsid/FSID/g"
+
+       # Print FSID even if it is not the same as metadata_uuid because it has
+       # to match in the golden output.
+       metadata_uuid=$(cat /sys/fs/btrfs/$fsid/metadata_uuid)
+       echo -e "Metadata uuid:\t\tFSID"
+
+       # This returns the temp_fsid if set
+       tempfsid=$(_btrfs_get_fsid $dev1)
+       if [[ $tempfsid == $fsid ]]; then
+               echo -e "Temp fsid:\t\tFSID"
+       elif [[ $tempfsid == $metadata_uuid ]]; then
+               # If we are here, it means there is a bug; let it not match with
+               # the golden output.
+               echo -e "Temp fsid:\t\t$metadata_uuid"
+       else
+               echo -e "Temp fsid:\t\tTEMPFSID"
+       fi
+
+       echo -e -n "Tempfsid status:\t"
+       cat /sys/fs/btrfs/$tempfsid/temp_fsid
+}