loop: use killable lock in ioctls
Even after the previous patch to drop lo_ctl_mutex while calling vfs_getattr(), there are other cases where we can end up sleeping for a long time while holding lo_ctl_mutex. Let's avoid the uninterruptible sleep from the ioctls. Signed-off-by: NOmar Sandoval <osandov@fb.com> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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