From: Hannes Reinecke <hare@suse.de>
To: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: Christoph Hellwig <hch@lst.de>,
James Bottomley <james.bottomley@hansenpartnership.com>,
linux-scsi@vger.kernel.org, Hannes Reinecke <hare@suse.de>
Subject: [PATCH 02/11] scsi: add scsi_host_flush_commands() helper
Date: Wed, 20 Nov 2019 11:31:05 +0100 [thread overview]
Message-ID: <20191120103114.24723-3-hare@suse.de> (raw)
In-Reply-To: <20191120103114.24723-1-hare@suse.de>
Add a helper scsi_host_flush_commands() to terminate all outstanding
commands on a scsi host.
Signed-off-by: Hannes Reinecke <hare@suse.de>
---
drivers/scsi/hosts.c | 29 +++++++++++++++++++++++++++++
include/scsi/scsi_host.h | 1 +
2 files changed, 30 insertions(+)
diff --git a/drivers/scsi/hosts.c b/drivers/scsi/hosts.c
index 1d669e47b692..c26fa1fe6103 100644
--- a/drivers/scsi/hosts.c
+++ b/drivers/scsi/hosts.c
@@ -650,3 +650,32 @@ void scsi_flush_work(struct Scsi_Host *shost)
flush_workqueue(shost->work_q);
}
EXPORT_SYMBOL_GPL(scsi_flush_work);
+
+static bool flush_cmds_iter(struct request *rq, void *data, bool reserved)
+{
+ struct scsi_cmnd *scmd = blk_mq_rq_to_pdu(rq);
+ int status = *(int *)data;
+
+ if (reserved)
+ return true;
+ scsi_dma_unmap(scmd);
+ scmd->result = status << 16;
+ scmd->scsi_done(scmd);
+ return true;
+}
+
+/**
+ * scsi_host_flush_commands -- Terminate all running commands
+ * @shost: Scsi Host on which commands should be terminated
+ * @status: Status to be set for the terminated commands
+ *
+ * There is no protection against modification of the number
+ * of outstanding commands. It is the responsibility of the
+ * caller to ensure that concurrent I/O submission and/or
+ * completion is stopped when calling this function.
+ */
+void scsi_host_flush_commands(struct Scsi_Host *shost, int status)
+{
+ blk_mq_tagset_busy_iter(&shost->tag_set, flush_cmds_iter, &status);
+}
+EXPORT_SYMBOL_GPL(scsi_host_flush_commands);
diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h
index f577647bf5f2..cb9a6fe9ad5b 100644
--- a/include/scsi/scsi_host.h
+++ b/include/scsi/scsi_host.h
@@ -735,6 +735,7 @@ extern int scsi_host_busy(struct Scsi_Host *shost);
extern void scsi_host_put(struct Scsi_Host *t);
extern struct Scsi_Host *scsi_host_lookup(unsigned short);
extern const char *scsi_host_state_name(enum scsi_host_state);
+extern void scsi_host_flush_commands(struct Scsi_Host *shost, int status);
static inline int __must_check scsi_add_host(struct Scsi_Host *host,
struct device *dev)
--
2.16.4
next prev parent reply other threads:[~2019-11-20 10:31 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-20 10:31 [PATCHv5 00/11] scsi: remove legacy cmd_list implementation Hannes Reinecke
2019-11-20 10:31 ` [PATCH 01/11] dpt_i2o: rename adpt_i2o_to_scsi() to adpt_i2o_scsi_complete() Hannes Reinecke
2019-11-26 16:54 ` Christoph Hellwig
2019-11-20 10:31 ` Hannes Reinecke [this message]
2019-11-20 16:19 ` [PATCH 02/11] scsi: add scsi_host_flush_commands() helper Bart Van Assche
2019-11-21 15:46 ` Hannes Reinecke
2019-11-26 16:55 ` Christoph Hellwig
2019-11-26 18:25 ` Hannes Reinecke
2019-11-20 10:31 ` [PATCH 03/11] dpt_i2o: use scsi_host_flush_commands() to abort outstanding commands Hannes Reinecke
2019-11-26 16:55 ` Christoph Hellwig
2019-11-20 10:31 ` [PATCH 04/11] aacraid: Do not wait for outstanding write commands on synchronize_cache Hannes Reinecke
2019-11-26 17:02 ` Christoph Hellwig
2019-11-28 11:40 ` Balsundar.P
2019-11-20 10:31 ` [PATCH 05/11] aacraid: use midlayer helper to terminate outstanding commands Hannes Reinecke
2019-11-26 17:02 ` Christoph Hellwig
2019-11-28 11:41 ` Balsundar.P
2019-11-20 10:31 ` [PATCH 06/11] aacraid: replace aac_flush_ios() with midlayer helper Hannes Reinecke
2019-11-20 16:14 ` Bart Van Assche
2019-11-28 11:41 ` Balsundar.P
2019-11-20 10:31 ` [PATCH 07/11] scsi: add scsi_host_quiesce()/scsi_host_resume() helper Hannes Reinecke
2019-11-20 10:31 ` [PATCH 08/11] aacraid: use scsi_host_quiesce() to wait for I/O to complete Hannes Reinecke
2019-11-20 16:23 ` Bart Van Assche
2019-11-26 8:29 ` Balsundar.P
2019-11-28 11:45 ` Balsundar.P
2019-11-28 12:09 ` Hannes Reinecke
2019-12-04 15:02 ` Hannes Reinecke
2019-11-20 10:31 ` [PATCH 09/11] scsi: add scsi_host_busy_iter() Hannes Reinecke
2019-11-20 10:31 ` [PATCH 10/11] aacraid: use scsi_host_busy_iter() in get_num_of_incomplete_fibs() Hannes Reinecke
2019-11-28 11:42 ` Balsundar.P
2019-11-20 10:31 ` [PATCH 11/11] scsi: Remove cmd_list functionality Hannes Reinecke
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