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| author | Nikolay Borisov <nborisov@suse.com> | 2018-10-30 16:43:26 +0200 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2018-12-17 14:51:38 +0100 |
| commit | d1a63002829a4d8014de20dc141b404cc808405e (patch) | |
| tree | 0734637651debfcf49ac8c20c8711a4924d131bd /fs/btrfs/volumes.h | |
| parent | fbc6feaec98ac0c6a615bbe9e17c5689a1a84650 (diff) | |
| download | linux-d1a63002829a4d8014de20dc141b404cc808405e.tar.bz2 | |
btrfs: add members to fs_devices to track fsid changes
In order to gracefully handle split-brain scenario during fsid change
(which are very unlikely, yet possible), two more pieces of information
will be necessary:
1. The highest generation number among all devices registered to a
particular btrfs_fs_devices
2. A boolean flag whether a given btrfs_fs_devices was created by a
device which had the FSID_CHANGING_V2 flag set.
This is a preparatory patch and just introduces the variables as well
as code which sets them, their actual use is going to happen in a later
patch.
Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/volumes.h')
| -rw-r--r-- | fs/btrfs/volumes.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h index bdee4b60e0ba..1d936ce282c3 100644 --- a/fs/btrfs/volumes.h +++ b/fs/btrfs/volumes.h @@ -211,6 +211,7 @@ BTRFS_DEVICE_GETSET_FUNCS(bytes_used); struct btrfs_fs_devices { u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */ u8 metadata_uuid[BTRFS_FSID_SIZE]; + bool fsid_change; struct list_head fs_list; u64 num_devices; @@ -219,6 +220,10 @@ struct btrfs_fs_devices { u64 missing_devices; u64 total_rw_bytes; u64 total_devices; + + /* Highest generation number of seen devices */ + u64 latest_generation; + struct block_device *latest_bdev; /* all of the devices in the FS, protected by a mutex |