From 31950192d939a969415d0e1da4c62598023b0850 Mon Sep 17 00:00:00 2001 From: Martin Wilck Date: Wed, 14 Jun 2023 12:36:15 +0200 Subject: [PATCH] scsi: core: Replace scsi_target_block() with scsi_block_targets() All callers (fc_remote_port_delete(), __iscsi_block_session(), __srp_start_tl_fail_timers(), srp_reconnect_rport(), snic_tgt_del()) pass parent devices of scsi_target devices to scsi_target_block(). Rename the function to scsi_block_targets(), and simplify it by assuming that it is always passed a parent device. Also, have callers pass the Scsi_Host pointer to scsi_block_targets(), as every caller has this pointer readily available. Suggested-by: Christoph Hellwig Suggested-by: Bart Van Assche Signed-off-by: Martin Wilck Link: https://lore.kernel.org/r/20230614103616.31857-7-mwilck@suse.com Cc: Karan Tilak Kumar Cc: Sesidhar Baddela Reviewed-by: Hannes Reinecke Reviewed-by: Christoph Hellwig Reviewed-by: Bart Van Assche Signed-off-by: Martin K. Petersen --- drivers/scsi/scsi_lib.c | 26 ++++++++++++++++---------- drivers/scsi/scsi_transport_fc.c | 2 +- drivers/scsi/scsi_transport_iscsi.c | 3 ++- drivers/scsi/scsi_transport_srp.c | 6 +++--- drivers/scsi/snic/snic_disc.c | 2 +- include/scsi/scsi_device.h | 2 +- 6 files changed, 24 insertions(+), 17 deletions(-) diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index b98750028044..55a327b2dd8b 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -2890,20 +2890,26 @@ target_block(struct device *dev, void *data) return 0; } +/** + * scsi_block_targets - transition all SCSI child devices to SDEV_BLOCK state + * @dev: a parent device of one or more scsi_target devices + * @shost: the Scsi_Host to which this device belongs + * + * Iterate over all children of @dev, which should be scsi_target devices, + * and switch all subordinate scsi devices to SDEV_BLOCK state. Wait for + * ongoing scsi_queue_rq() calls to finish. May sleep. + * + * Note: + * @dev must not itself be a scsi_target device. + */ void -scsi_target_block(struct device *dev) +scsi_block_targets(struct Scsi_Host *shost, struct device *dev) { - struct Scsi_Host *shost = dev_to_shost(dev); - - if (scsi_is_target_device(dev)) - starget_for_each_device(to_scsi_target(dev), NULL, - scsi_device_block); - else - device_for_each_child(dev, NULL, target_block); - + WARN_ON_ONCE(scsi_is_target_device(dev)); + device_for_each_child(dev, NULL, target_block); blk_mq_wait_quiesce_done(&shost->tag_set); } -EXPORT_SYMBOL_GPL(scsi_target_block); +EXPORT_SYMBOL_GPL(scsi_block_targets); static void device_unblock(struct scsi_device *sdev, void *data) diff --git a/drivers/scsi/scsi_transport_fc.c b/drivers/scsi/scsi_transport_fc.c index 64ff2629eaf9..b04075f19445 100644 --- a/drivers/scsi/scsi_transport_fc.c +++ b/drivers/scsi/scsi_transport_fc.c @@ -3451,7 +3451,7 @@ fc_remote_port_delete(struct fc_rport *rport) spin_unlock_irqrestore(shost->host_lock, flags); - scsi_target_block(&rport->dev); + scsi_block_targets(shost, &rport->dev); /* see if we need to kill io faster than waiting for device loss */ if ((rport->fast_io_fail_tmo != -1) && diff --git a/drivers/scsi/scsi_transport_iscsi.c b/drivers/scsi/scsi_transport_iscsi.c index b9b97300e3b3..e527ece12453 100644 --- a/drivers/scsi/scsi_transport_iscsi.c +++ b/drivers/scsi/scsi_transport_iscsi.c @@ -1943,13 +1943,14 @@ static void __iscsi_block_session(struct work_struct *work) struct iscsi_cls_session *session = container_of(work, struct iscsi_cls_session, block_work); + struct Scsi_Host *shost = iscsi_session_to_shost(session); unsigned long flags; ISCSI_DBG_TRANS_SESSION(session, "Blocking session\n"); spin_lock_irqsave(&session->lock, flags); session->state = ISCSI_SESSION_FAILED; spin_unlock_irqrestore(&session->lock, flags); - scsi_target_block(&session->dev); + scsi_block_targets(shost, &session->dev); ISCSI_DBG_TRANS_SESSION(session, "Completed SCSI target blocking\n"); if (session->recovery_tmo >= 0) queue_delayed_work(session->workq, diff --git a/drivers/scsi/scsi_transport_srp.c b/drivers/scsi/scsi_transport_srp.c index 87d0fb8dc503..64f6b22e8cc0 100644 --- a/drivers/scsi/scsi_transport_srp.c +++ b/drivers/scsi/scsi_transport_srp.c @@ -396,7 +396,7 @@ static void srp_reconnect_work(struct work_struct *work) } /* - * scsi_target_block() must have been called before this function is + * scsi_block_targets() must have been called before this function is * called to guarantee that no .queuecommand() calls are in progress. */ static void __rport_fail_io_fast(struct srp_rport *rport) @@ -480,7 +480,7 @@ static void __srp_start_tl_fail_timers(struct srp_rport *rport) srp_rport_set_state(rport, SRP_RPORT_BLOCKED) == 0) { pr_debug("%s new state: %d\n", dev_name(&shost->shost_gendev), rport->state); - scsi_target_block(&shost->shost_gendev); + scsi_block_targets(shost, &shost->shost_gendev); if (fast_io_fail_tmo >= 0) queue_delayed_work(system_long_wq, &rport->fast_io_fail_work, @@ -548,7 +548,7 @@ int srp_reconnect_rport(struct srp_rport *rport) * later is ok though, scsi_internal_device_unblock_nowait() * treats SDEV_TRANSPORT_OFFLINE like SDEV_BLOCK. */ - scsi_target_block(&shost->shost_gendev); + scsi_block_targets(shost, &shost->shost_gendev); res = rport->state != SRP_RPORT_LOST ? i->f->reconnect(rport) : -ENODEV; pr_debug("%s (state %d): transport.reconnect() returned %d\n", dev_name(&shost->shost_gendev), rport->state, res); diff --git a/drivers/scsi/snic/snic_disc.c b/drivers/scsi/snic/snic_disc.c index 8fbf3c1b1311..3e2e5783924d 100644 --- a/drivers/scsi/snic/snic_disc.c +++ b/drivers/scsi/snic/snic_disc.c @@ -214,7 +214,7 @@ snic_tgt_del(struct work_struct *work) scsi_flush_work(shost); /* Block IOs on child devices, stops new IOs */ - scsi_target_block(&tgt->dev); + scsi_block_targets(shost, &tgt->dev); /* Cleanup IOs */ snic_tgt_scsi_abort_io(tgt); diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h index f10a008e5bfa..8bd5b00b33cc 100644 --- a/include/scsi/scsi_device.h +++ b/include/scsi/scsi_device.h @@ -450,7 +450,7 @@ extern void scsi_scan_target(struct device *parent, unsigned int channel, unsigned int id, u64 lun, enum scsi_scan_mode rescan); extern void scsi_target_reap(struct scsi_target *); -extern void scsi_target_block(struct device *); +void scsi_block_targets(struct Scsi_Host *shost, struct device *dev); extern void scsi_target_unblock(struct device *, enum scsi_device_state); extern void scsi_remove_target(struct device *); extern const char *scsi_device_state_name(enum scsi_device_state); -- 2.34.1