btrfs: add members to fs_devices to track fsid changes

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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>

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Nikolay Borisov 2018-10-30 16:43:26 +02:00 • committed by David Sterba

parent fbc6feaec9

commit d1a6300282

2 changed files with 13 additions and 1 deletions

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9

fs/btrfs/volumes.c

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5

fs/btrfs/volumes.h

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