void _req_may_be_done(struct drbd_request *req, struct bio_and_error *m) { const unsigned long s = req->rq_state; struct drbd_conf *mdev = req->mdev; int rw = req->master_bio ? bio_data_dir(req->master_bio) : WRITE; if (s & RQ_NET_QUEUED) return; if (s & RQ_NET_PENDING) return; if (s & RQ_LOCAL_PENDING) return; if (req->master_bio) { int ok = (s & RQ_LOCAL_OK) || (s & RQ_NET_OK); int error = PTR_ERR(req->private_bio); if (!hlist_unhashed(&req->collision)) hlist_del(&req->collision); else D_ASSERT((s & (RQ_NET_MASK & ~RQ_NET_DONE)) == 0); if (rw == WRITE) _about_to_complete_local_write(mdev, req); _drbd_end_io_acct(mdev, req); m->error = ok ? 0 : (error ?: -EIO); m->bio = req->master_bio; req->master_bio = NULL; }
/* Helper for __req_mod(). * Set m->bio to the master bio, if it is fit to be completed, * or leave it alone (it is initialized to NULL in __req_mod), * if it has already been completed, or cannot be completed yet. * If m->bio is set, the error status to be returned is placed in m->error. */ void _req_may_be_done(struct drbd_request *req, struct bio_and_error *m) { const unsigned long s = req->rq_state; struct drbd_conf *mdev = req->mdev; /* only WRITES may end up here without a master bio (on barrier ack) */ int rw = req->master_bio ? bio_data_dir(req->master_bio) : WRITE; /* we must not complete the master bio, while it is * still being processed by _drbd_send_zc_bio (drbd_send_dblock) * not yet acknowledged by the peer * not yet completed by the local io subsystem * these flags may get cleared in any order by * the worker, * the receiver, * the bio_endio completion callbacks. */ if (s & RQ_NET_QUEUED) return; if (s & RQ_NET_PENDING) return; if (s & RQ_LOCAL_PENDING) return; if (req->master_bio) { /* this is data_received (remote read) * or protocol C P_WRITE_ACK * or protocol B P_RECV_ACK * or protocol A "handed_over_to_network" (SendAck) * or canceled or failed, * or killed from the transfer log due to connection loss. */ /* * figure out whether to report success or failure. * * report success when at least one of the operations succeeded. * or, to put the other way, * only report failure, when both operations failed. * * what to do about the failures is handled elsewhere. * what we need to do here is just: complete the master_bio. * * local completion error, if any, has been stored as ERR_PTR * in private_bio within drbd_endio_pri. */ int ok = (s & RQ_LOCAL_OK) || (s & RQ_NET_OK); int error = PTR_ERR(req->private_bio); /* remove the request from the conflict detection * respective block_id verification hash */ if (!hlist_unhashed(&req->collision)) hlist_del(&req->collision); else D_ASSERT((s & (RQ_NET_MASK & ~RQ_NET_DONE)) == 0); /* for writes we need to do some extra housekeeping */ if (rw == WRITE) _about_to_complete_local_write(mdev, req); /* Update disk stats */ _drbd_end_io_acct(mdev, req); m->error = ok ? 0 : (error ?: -EIO); m->bio = req->master_bio; req->master_bio = NULL; }