btrfs: add sanity check when resuming balance after mount

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Replace a WARN_ON with a proper check and message in case something goes
really wrong and resumed balance cannot set up its exclusive status.
The check is a user friendly assertion, I don't expect to ever happen
under normal circumstances.

Also document that the paused balance starts here and owns the exclusive
op status.

Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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David Sterba 2018-03-20 20:07:58 +01:00

parent 010a47bde9

commit eee95e3fb0

1 changed files with 13 additions and 1 deletions

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fs/btrfs/volumes.c

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