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| author | Anand Jain <anand.jain@oracle.com> | 2023-05-24 20:02:38 +0800 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2023-06-19 13:59:29 +0200 |
| commit | f62c302e6dfe7bb03b35157e1c1b7cdaeabd54f9 (patch) | |
| tree | bfe6476ed084391b4fc3f81b3682dccf69229491 | |
| parent | c6930d7d11e30f55dee1e306bc3a3105fde56f93 (diff) | |
| download | linux-stable-f62c302e6dfe7bb03b35157e1c1b7cdaeabd54f9.tar.gz linux-stable-f62c302e6dfe7bb03b35157e1c1b7cdaeabd54f9.tar.bz2 linux-stable-f62c302e6dfe7bb03b35157e1c1b7cdaeabd54f9.zip | |
btrfs: add comment about metadata_uuid in btrfs_fs_devices
Add comment about metadata_uuid in btrfs_fs_devices.
No functional change.
Signed-off-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
| -rw-r--r-- | fs/btrfs/volumes.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h index 236ae696c984..24f30542ef7c 100644 --- a/fs/btrfs/volumes.h +++ b/fs/btrfs/volumes.h @@ -280,7 +280,19 @@ enum btrfs_read_policy { struct btrfs_fs_devices { u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */ + + /* + * UUID written into the btree blocks: + * + * - If metadata_uuid != fsid then super block must have + * BTRFS_FEATURE_INCOMPAT_METADATA_UUID flag set. + * + * - Following shall be true at all times: + * - metadata_uuid == btrfs_header::fsid + * - metadata_uuid == btrfs_dev_item::fsid + */ u8 metadata_uuid[BTRFS_FSID_SIZE]; + struct list_head fs_list; /* |