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nvmet: use a private workqueue instead of the system workqueue

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Any attempt to flush kernel-global WQs has possibility of deadlock
so we should simply stop using them, instead introduce nvmet_wq
which is the generic nvmet workqueue for work elements that
don't explicitly require a dedicated workqueue (by the mere fact
that they are using the system_wq).

Changes were done using the following replaces:

 - s/schedule_work(/queue_work(nvmet_wq, /g
 - s/schedule_delayed_work(/queue_delayed_work(nvmet_wq, /g
 - s/flush_scheduled_work()/flush_workqueue(nvmet_wq)/g

Reported-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Sagi Grimberg 2022-03-21 13:57:27 +02:00 committed by Christoph Hellwig
parent bc360b0b16
commit 8832cf9221
11 changed files with 50 additions and 37 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/nvme/target/admin-cmd.c
View File

@ -988,7 +988,7 @@ void nvmet_execute_async_event(struct nvmet_req *req)
ctrl->async_event_cmds[ctrl->nr_async_event_cmds++] = req;
mutex_unlock(&ctrl->lock);
schedule_work(&ctrl->async_event_work);
queue_work(nvmet_wq, &ctrl->async_event_work);
}
void nvmet_execute_keep_alive(struct nvmet_req *req)

2
drivers/nvme/target/configfs.c
View File

@ -1593,7 +1593,7 @@ static void nvmet_port_release(struct config_item *item)
struct nvmet_port *port = to_nvmet_port(item);
/* Let inflight controllers teardown complete */
flush_scheduled_work();
flush_workqueue(nvmet_wq);
list_del(&port->global_entry);
kfree(port->ana_state);

24
drivers/nvme/target/core.c
View File

@ -20,6 +20,9 @@ struct workqueue_struct *zbd_wq;
static const struct nvmet_fabrics_ops *nvmet_transports[NVMF_TRTYPE_MAX];
static DEFINE_IDA(cntlid_ida);
struct workqueue_struct *nvmet_wq;
EXPORT_SYMBOL_GPL(nvmet_wq);
/*
* This read/write semaphore is used to synchronize access to configuration
* information on a target system that will result in discovery log page
@ -205,7 +208,7 @@ void nvmet_add_async_event(struct nvmet_ctrl *ctrl, u8 event_type,
list_add_tail(&aen->entry, &ctrl->async_events);
mutex_unlock(&ctrl->lock);
schedule_work(&ctrl->async_event_work);
queue_work(nvmet_wq, &ctrl->async_event_work);
}
static void nvmet_add_to_changed_ns_log(struct nvmet_ctrl *ctrl, __le32 nsid)
@ -385,7 +388,7 @@ static void nvmet_keep_alive_timer(struct work_struct *work)
if (reset_tbkas) {
pr_debug("ctrl %d reschedule traffic based keep-alive timer\n",
ctrl->cntlid);
schedule_delayed_work(&ctrl->ka_work, ctrl->kato * HZ);
queue_delayed_work(nvmet_wq, &ctrl->ka_work, ctrl->kato * HZ);
return;
}
@ -403,7 +406,7 @@ void nvmet_start_keep_alive_timer(struct nvmet_ctrl *ctrl)
pr_debug("ctrl %d start keep-alive timer for %d secs\n",
ctrl->cntlid, ctrl->kato);
schedule_delayed_work(&ctrl->ka_work, ctrl->kato * HZ);
queue_delayed_work(nvmet_wq, &ctrl->ka_work, ctrl->kato * HZ);
}
void nvmet_stop_keep_alive_timer(struct nvmet_ctrl *ctrl)
@ -1478,7 +1481,7 @@ void nvmet_ctrl_fatal_error(struct nvmet_ctrl *ctrl)
mutex_lock(&ctrl->lock);
if (!(ctrl->csts & NVME_CSTS_CFS)) {
ctrl->csts |= NVME_CSTS_CFS;
schedule_work(&ctrl->fatal_err_work);
queue_work(nvmet_wq, &ctrl->fatal_err_work);
}
mutex_unlock(&ctrl->lock);
}
@ -1620,9 +1623,15 @@ static int __init nvmet_init(void)
goto out_free_zbd_work_queue;
}
nvmet_wq = alloc_workqueue("nvmet-wq", WQ_MEM_RECLAIM, 0);
if (!nvmet_wq) {
error = -ENOMEM;
goto out_free_buffered_work_queue;
}
error = nvmet_init_discovery();
if (error)
goto out_free_work_queue;
goto out_free_nvmet_work_queue;
error = nvmet_init_configfs();
if (error)
@ -1631,7 +1640,9 @@ static int __init nvmet_init(void)
out_exit_discovery:
nvmet_exit_discovery();
out_free_work_queue:
out_free_nvmet_work_queue:
destroy_workqueue(nvmet_wq);
out_free_buffered_work_queue:
destroy_workqueue(buffered_io_wq);
out_free_zbd_work_queue:
destroy_workqueue(zbd_wq);
@ -1643,6 +1654,7 @@ static void __exit nvmet_exit(void)
nvmet_exit_configfs();
nvmet_exit_discovery();
ida_destroy(&cntlid_ida);
destroy_workqueue(nvmet_wq);
destroy_workqueue(buffered_io_wq);
destroy_workqueue(zbd_wq);

8
drivers/nvme/target/fc.c
View File

@ -1491,7 +1491,7 @@ __nvmet_fc_free_assocs(struct nvmet_fc_tgtport *tgtport)
list_for_each_entry_rcu(assoc, &tgtport->assoc_list, a_list) {
if (!nvmet_fc_tgt_a_get(assoc))
continue;
if (!schedule_work(&assoc->del_work))
if (!queue_work(nvmet_wq, &assoc->del_work))
/* already deleting - release local reference */
nvmet_fc_tgt_a_put(assoc);
}
@ -1546,7 +1546,7 @@ nvmet_fc_invalidate_host(struct nvmet_fc_target_port *target_port,
continue;
assoc->hostport->invalid = 1;
noassoc = false;
if (!schedule_work(&assoc->del_work))
if (!queue_work(nvmet_wq, &assoc->del_work))
/* already deleting - release local reference */
nvmet_fc_tgt_a_put(assoc);
}
@ -1592,7 +1592,7 @@ nvmet_fc_delete_ctrl(struct nvmet_ctrl *ctrl)
nvmet_fc_tgtport_put(tgtport);
if (found_ctrl) {
if (!schedule_work(&assoc->del_work))
if (!queue_work(nvmet_wq, &assoc->del_work))
/* already deleting - release local reference */
nvmet_fc_tgt_a_put(assoc);
return;
@ -2060,7 +2060,7 @@ nvmet_fc_rcv_ls_req(struct nvmet_fc_target_port *target_port,
iod->rqstdatalen = lsreqbuf_len;
iod->hosthandle = hosthandle;
schedule_work(&iod->work);
queue_work(nvmet_wq, &iod->work);
return 0;
}

16
drivers/nvme/target/fcloop.c
View File

@ -360,7 +360,7 @@ fcloop_h2t_ls_req(struct nvme_fc_local_port *localport,
spin_lock(&rport->lock);
list_add_tail(&rport->ls_list, &tls_req->ls_list);
spin_unlock(&rport->lock);
schedule_work(&rport->ls_work);
queue_work(nvmet_wq, &rport->ls_work);
return ret;
}
@ -393,7 +393,7 @@ fcloop_h2t_xmt_ls_rsp(struct nvmet_fc_target_port *targetport,
spin_lock(&rport->lock);
list_add_tail(&rport->ls_list, &tls_req->ls_list);
spin_unlock(&rport->lock);
schedule_work(&rport->ls_work);
queue_work(nvmet_wq, &rport->ls_work);
}
return 0;
@ -448,7 +448,7 @@ fcloop_t2h_ls_req(struct nvmet_fc_target_port *targetport, void *hosthandle,
spin_lock(&tport->lock);
list_add_tail(&tport->ls_list, &tls_req->ls_list);
spin_unlock(&tport->lock);
schedule_work(&tport->ls_work);
queue_work(nvmet_wq, &tport->ls_work);
return ret;
}
@ -480,7 +480,7 @@ fcloop_t2h_xmt_ls_rsp(struct nvme_fc_local_port *localport,
spin_lock(&tport->lock);
list_add_tail(&tport->ls_list, &tls_req->ls_list);
spin_unlock(&tport->lock);
schedule_work(&tport->ls_work);
queue_work(nvmet_wq, &tport->ls_work);
}
return 0;
@ -520,7 +520,7 @@ fcloop_tgt_discovery_evt(struct nvmet_fc_target_port *tgtport)
tgt_rscn->tport = tgtport->private;
INIT_WORK(&tgt_rscn->work, fcloop_tgt_rscn_work);
schedule_work(&tgt_rscn->work);
queue_work(nvmet_wq, &tgt_rscn->work);
}
static void
@ -739,7 +739,7 @@ fcloop_fcp_req(struct nvme_fc_local_port *localport,
INIT_WORK(&tfcp_req->tio_done_work, fcloop_tgt_fcprqst_done_work);
kref_init(&tfcp_req->ref);
schedule_work(&tfcp_req->fcp_rcv_work);
queue_work(nvmet_wq, &tfcp_req->fcp_rcv_work);
return 0;
}
@ -921,7 +921,7 @@ fcloop_fcp_req_release(struct nvmet_fc_target_port *tgtport,
{
struct fcloop_fcpreq *tfcp_req = tgt_fcp_req_to_fcpreq(tgt_fcpreq);
schedule_work(&tfcp_req->tio_done_work);
queue_work(nvmet_wq, &tfcp_req->tio_done_work);
}
static void
@ -976,7 +976,7 @@ fcloop_fcp_abort(struct nvme_fc_local_port *localport,
if (abortio)
/* leave the reference while the work item is scheduled */
WARN_ON(!schedule_work(&tfcp_req->abort_rcv_work));
WARN_ON(!queue_work(nvmet_wq, &tfcp_req->abort_rcv_work));
else {
/*
* as the io has already had the done callback made,

6
drivers/nvme/target/io-cmd-file.c
View File

@ -283,7 +283,7 @@ static void nvmet_file_execute_flush(struct nvmet_req *req)
if (!nvmet_check_transfer_len(req, 0))
return;
INIT_WORK(&req->f.work, nvmet_file_flush_work);
schedule_work(&req->f.work);
queue_work(nvmet_wq, &req->f.work);
}
static void nvmet_file_execute_discard(struct nvmet_req *req)
@ -343,7 +343,7 @@ static void nvmet_file_execute_dsm(struct nvmet_req *req)
if (!nvmet_check_data_len_lte(req, nvmet_dsm_len(req)))
return;
INIT_WORK(&req->f.work, nvmet_file_dsm_work);
schedule_work(&req->f.work);
queue_work(nvmet_wq, &req->f.work);
}
static void nvmet_file_write_zeroes_work(struct work_struct *w)
@ -373,7 +373,7 @@ static void nvmet_file_execute_write_zeroes(struct nvmet_req *req)
if (!nvmet_check_transfer_len(req, 0))
return;
INIT_WORK(&req->f.work, nvmet_file_write_zeroes_work);
schedule_work(&req->f.work);
queue_work(nvmet_wq, &req->f.work);
}
u16 nvmet_file_parse_io_cmd(struct nvmet_req *req)

4
drivers/nvme/target/loop.c
View File

@ -166,7 +166,7 @@ static blk_status_t nvme_loop_queue_rq(struct blk_mq_hw_ctx *hctx,
iod->req.transfer_len = blk_rq_payload_bytes(req);
}
schedule_work(&iod->work);
queue_work(nvmet_wq, &iod->work);
return BLK_STS_OK;
}
@ -187,7 +187,7 @@ static void nvme_loop_submit_async_event(struct nvme_ctrl *arg)
return;
}
schedule_work(&iod->work);
queue_work(nvmet_wq, &iod->work);
}
static int nvme_loop_init_iod(struct nvme_loop_ctrl *ctrl,

1
drivers/nvme/target/nvmet.h
View File

@ -366,6 +366,7 @@ struct nvmet_req {
extern struct workqueue_struct *buffered_io_wq;
extern struct workqueue_struct *zbd_wq;
extern struct workqueue_struct *nvmet_wq;
static inline void nvmet_set_result(struct nvmet_req *req, u32 result)
{

2
drivers/nvme/target/passthru.c
View File

@ -283,7 +283,7 @@ static void nvmet_passthru_execute_cmd(struct nvmet_req *req)
if (req->p.use_workqueue || effects) {
INIT_WORK(&req->p.work, nvmet_passthru_execute_cmd_work);
req->p.rq = rq;
schedule_work(&req->p.work);
queue_work(nvmet_wq, &req->p.work);
} else {
rq->end_io_data = req;
blk_execute_rq_nowait(rq, false, nvmet_passthru_req_done);

12
drivers/nvme/target/rdma.c
View File

@ -1584,7 +1584,7 @@ static int nvmet_rdma_queue_connect(struct rdma_cm_id *cm_id,
if (queue->host_qid == 0) {
/* Let inflight controller teardown complete */
flush_scheduled_work();
flush_workqueue(nvmet_wq);
}
ret = nvmet_rdma_cm_accept(cm_id, queue, &event->param.conn);
@ -1669,7 +1669,7 @@ static void __nvmet_rdma_queue_disconnect(struct nvmet_rdma_queue *queue)
if (disconnect) {
rdma_disconnect(queue->cm_id);
schedule_work(&queue->release_work);
queue_work(nvmet_wq, &queue->release_work);
}
}
@ -1699,7 +1699,7 @@ static void nvmet_rdma_queue_connect_fail(struct rdma_cm_id *cm_id,
mutex_unlock(&nvmet_rdma_queue_mutex);
pr_err("failed to connect queue %d\n", queue->idx);
schedule_work(&queue->release_work);
queue_work(nvmet_wq, &queue->release_work);
}
/**
@ -1773,7 +1773,7 @@ static int nvmet_rdma_cm_handler(struct rdma_cm_id *cm_id,
if (!queue) {
struct nvmet_rdma_port *port = cm_id->context;
schedule_delayed_work(&port->repair_work, 0);
queue_delayed_work(nvmet_wq, &port->repair_work, 0);
break;
}
fallthrough;
@ -1903,7 +1903,7 @@ static void nvmet_rdma_repair_port_work(struct work_struct *w)
nvmet_rdma_disable_port(port);
ret = nvmet_rdma_enable_port(port);
if (ret)
schedule_delayed_work(&port->repair_work, 5 * HZ);
queue_delayed_work(nvmet_wq, &port->repair_work, 5 * HZ);
}
static int nvmet_rdma_add_port(struct nvmet_port *nport)
@ -2053,7 +2053,7 @@ static void nvmet_rdma_remove_one(struct ib_device *ib_device, void *client_data
}
mutex_unlock(&nvmet_rdma_queue_mutex);
flush_scheduled_work();
flush_workqueue(nvmet_wq);
}
static struct ib_client nvmet_rdma_ib_client = {

10
drivers/nvme/target/tcp.c
View File

@ -1269,7 +1269,7 @@ static void nvmet_tcp_schedule_release_queue(struct nvmet_tcp_queue *queue)
spin_lock(&queue->state_lock);
if (queue->state != NVMET_TCP_Q_DISCONNECTING) {
queue->state = NVMET_TCP_Q_DISCONNECTING;
schedule_work(&queue->release_work);
queue_work(nvmet_wq, &queue->release_work);
}
spin_unlock(&queue->state_lock);
}
@ -1684,7 +1684,7 @@ static void nvmet_tcp_listen_data_ready(struct sock *sk)
goto out;
if (sk->sk_state == TCP_LISTEN)
schedule_work(&port->accept_work);
queue_work(nvmet_wq, &port->accept_work);
out:
read_unlock_bh(&sk->sk_callback_lock);
}
@ -1815,7 +1815,7 @@ static u16 nvmet_tcp_install_queue(struct nvmet_sq *sq)
if (sq->qid == 0) {
/* Let inflight controller teardown complete */
flush_scheduled_work();
flush_workqueue(nvmet_wq);
}
queue->nr_cmds = sq->size * 2;
@ -1876,12 +1876,12 @@ static void __exit nvmet_tcp_exit(void)
nvmet_unregister_transport(&nvmet_tcp_ops);
flush_scheduled_work();
flush_workqueue(nvmet_wq);
mutex_lock(&nvmet_tcp_queue_mutex);
list_for_each_entry(queue, &nvmet_tcp_queue_list, queue_list)
kernel_sock_shutdown(queue->sock, SHUT_RDWR);
mutex_unlock(&nvmet_tcp_queue_mutex);
flush_scheduled_work();
flush_workqueue(nvmet_wq);
destroy_workqueue(nvmet_tcp_wq);
}