[PATCH v2 03/10] btrfs: create a helper function, check_fsid(), to verify the tempfsid

Anand Jain
2024-02-19T19:49:29Z

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>
---
v2:
Drop the function sb()
Use $AWK_PROG instead of awk.
egrep -> grep -E

common/btrfs | 35 +++++++++++++++++++++++++++++++++++
1 file changed, 35 insertions(+)

diff --git a/common/btrfs b/common/btrfs
index e1b29c613767..797f6a794dfc 100644
--- a/common/btrfs
+++ b/common/btrfs
@@ -792,3 +792,38 @@ _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=$1
+ local fsid
+ local metadata_uuid
+
+ # on disk fsid
+ fsid=$($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
+}
--
2.39.3