[PATCH 4/5] scsi: Added routine to set SCMD_NORETRIES_ABORT bit for outstanding io on scsi_dev

Muneendra
2020-08-05T09:46:41Z

Added a new routine scsi_set_noretries_abort_io_device()to set
SCMD_NORETRIES_ABORT for all the inflight/pending IO's on a particular
scsi device at that particular instant.

Export the symbol so the routine can be called by scsi_transport_fc.c

Added new function declaration scsi_set_noretries_abort_io_device in
scsi_priv.h

Signed-off-by: Muneendra <muneendra.kumar@broadcom.com>
---
drivers/scsi/scsi_error.c | 53 +++++++++++++++++++++++++++++++++++++++++++++++
drivers/scsi/scsi_priv.h | 1 +
2 files changed, 54 insertions(+)

diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
index 3222496..938d770 100644
--- a/drivers/scsi/scsi_error.c
+++ b/drivers/scsi/scsi_error.c
@@ -271,6 +271,59 @@ void scsi_eh_scmd_add(struct scsi_cmnd *scmd)
call_rcu(&scmd->rcu, scsi_eh_inc_host_failed);
}

+static bool
+scsi_set_noretries_abort_io(struct request *rq, void *priv, bool reserved)
+{
+ struct scsi_cmnd *scmd = blk_mq_rq_to_pdu(rq);
+ struct scsi_device *sdev = scmd->device;
+
+ /* only set SCMD_NORETRIES_ABORT on ios on a specific sdev */
+ if (sdev != priv)
+ return true;
+ /* we don't want this command reissued on abort success
+ * so set SCMD_NORETRIES_ABORT bit to ensure it
+ * won't get reissued
+ */
+ if (READ_ONCE(rq->state) == MQ_RQ_IN_FLIGHT)
+ set_bit(SCMD_NORETRIES_ABORT, &scmd->state);
+ return true;
+}
+
+static int
+__scsi_set_noretries_abort_io_device(struct scsi_device *sdev)
+{
+
+ if (sdev->sdev_state != SDEV_RUNNING)
+ return -EINVAL;
+
+ if (blk_queue_init_done(sdev->request_queue)) {
+
+ blk_mq_quiesce_queue(sdev->request_queue);
+ blk_mq_tagset_busy_iter(&sdev->host->tag_set,
+ scsi_set_noretries_abort_io, sdev);
+ blk_mq_unquiesce_queue(sdev->request_queue);
+ }
+ return 0;
+}
+
+/*
+ * scsi_set_noretries_abort_io_device - set the SCMD_NORETRIES_ABORT
+ * bit for all the pending io's on a device
+ * @sdev: scsi_device
+ */
+int
+scsi_set_noretries_abort_io_device(struct scsi_device *sdev)
+{
+ struct Scsi_Host *shost = sdev->host;
+ int ret = -EINVAL;
+
+ mutex_lock(&shost->scan_mutex);
+ ret = __scsi_set_noretries_abort_io_device(sdev);
+ mutex_unlock(&shost->scan_mutex);
+ return ret;
+}
+EXPORT_SYMBOL(scsi_set_noretries_abort_io_device);
+
/**
* scsi_times_out - Timeout function for normal scsi commands.
* @req: request that is timing out.
diff --git a/drivers/scsi/scsi_priv.h b/drivers/scsi/scsi_priv.h
index d12ada0..1bbffd3 100644
--- a/drivers/scsi/scsi_priv.h
+++ b/drivers/scsi/scsi_priv.h
@@ -81,6 +81,7 @@ void scsi_eh_ready_devs(struct Scsi_Host *shost,
int scsi_eh_get_sense(struct list_head *work_q,
struct list_head *done_q);
int scsi_noretry_cmd(struct scsi_cmnd *scmd);
+extern int scsi_set_noretries_abort_io_device(struct scsi_device *sdev);

/* scsi_lib.c */
extern int scsi_maybe_unblock_host(struct scsi_device *sdev);
--
1.8.3.1