On 04/20/2018 12:33 AM, David Sterba wrote:
Currently fs_info::balance_running is 0 or 1 and does not use the semantics of atomics. The pause and cancel check for 0, that can happen only after __btrfs_balance exits for whatever reason. Parallel calls to balance ioctl may enter btrfs_ioctl_balance multiple times but will block on the balance_mutex that protects the fs_info::flags bit. Signed-off-by: David Sterba <dste...@suse.com>
Though it appears to me that we could optimize the lock and atomic bit usage a little more, however it can be taken for the next round of cleanups. So for now.. Reviewed-by: Anand Jain <anand.j...@oracle.com> Thanks, Anand -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
