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0fe6ae39a6
commitbc1ecc65a2upstream. While it was never a good idea to sleep in request_fn(), commit34c6bc2c91("locking/mutexes: Add extra reschedule point") made it a *bad* idea. mutex_lock() since 3.15 may reschedule *before* putting task on the mutex wait queue, which for tasks in !TASK_RUNNING state means block forever. request_fn() may be called with !TASK_RUNNING on the way to schedule() in io_schedule(). Offload request handling to a workqueue, one per rbd device, to avoid calling blocking primitives from rbd_request_fn(). Fixes: http://tracker.ceph.com/issues/8818 Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com> Tested-by: Eric Eastman <eric0e@aol.com> Tested-by: Greg Wilson <greg.wilson@keepertech.com> Reviewed-by: Alex Elder <elder@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
5608 lines
142 KiB
5608 lines
142 KiB