loop: Split setting of lo_state from loop_clr_fd
Move setting of lo_state to Lo_rundown out into the callers. That will allow us to unlock loop_ctl_mutex while the loop device is protected from other changes by its special state. Signed-off-by: NJan Kara <jack@suse.cz> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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