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[1/4] btrfs: comment for temp-fsid, fsid, and metadata_uuid

Message ID 9e564f1c251d757f2f0c5a62833999b512345eb6.1696431315.git.anand.jain@oracle.com (mailing list archive)
State New, archived
Headers show
Series btrfs: sysfs and unsupported temp-fsid features for clones | expand

Commit Message

Anand Jain Oct. 4, 2023, 3 p.m. UTC 
Add a comment to explain the relationship between temp-fsid, fsid, and
metadata_uuid.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
---
 fs/btrfs/volumes.h | 4 ++++
 1 file changed, 4 insertions(+)
diff mbox series

Patch

diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
index fef46c0dbf19..5dd4ad775e5d 100644
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h
@@ -299,6 +299,10 @@  struct btrfs_fs_devices {
 	 *   - When the BTRFS_FEATURE_INCOMPAT_METADATA_UUID flag is set:
 	 *       fs_devices->fsid == sb->fsid
 	 *       fs_devices->metadata_uuid == sb->metadata_uuid
+	 *
+	 *   - When in-memory fs_devices->temp_fsid is true
+	 *	 fs_devices->fsid = random
+	 *	 fs_devices->metadata_uuid == sb->fsid
 	 */
 	u8 metadata_uuid[BTRFS_FSID_SIZE];