tree cfd844d7ce857a5e29afb0add7853bcc476b17ca
parent 008ef0969dd966ccb567d9c5c6e606f68119a380
author David Sterba <dsterba@suse.com> 1521595753 +0100
committer David Sterba <dsterba@suse.com> 1527523646 +0200

btrfs: use mutex in btrfs_resume_balance_async

While the spinlock does not cause problems, using the mutex is more
correct and consistent with others. The global status of balance is eg.
checked from btrfs_pause_balance or btrfs_cancel_balance with mutex.

Resuming balance happens during mount or ro->rw remount. In the former
case, no other user of the balance_ctl exists, in the latter, balance
cannot run until the ro/rw transition is finished.

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