[PATCH 2/9] scsi: add scsi_host_flush_commands() helper

Hannes Reinecke
2019-11-18T09:22:32Z

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 | 24 ++++++++++++++++++++++++
include/scsi/scsi_host.h | 1 +
2 files changed, 25 insertions(+)

diff --git a/drivers/scsi/hosts.c b/drivers/scsi/hosts.c
index 1d669e47b692..da1df48ef27c 100644
--- a/drivers/scsi/hosts.c
+++ b/drivers/scsi/hosts.c
@@ -650,3 +650,27 @@ void scsi_flush_work(struct Scsi_Host *shost)
flush_workqueue(shost->work_q);
}
EXPORT_SYMBOL_GPL(scsi_flush_work);
+
+
+/**
+ * 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
+ */
+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;
+ scmd->result = status << 16;
+ scmd->scsi_done(scmd);
+ return true;
+}
+
+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