linux-kernel - [PATCH v2 3/3] scsi: blocking IO when host is set blocked

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Message-Id: <20230328143442.2684167-4-yebin@huaweicloud.com>
Date:   Tue, 28 Mar 2023 22:34:42 +0800
From:   Ye Bin <yebin@...weicloud.com>
To:     jejb@...ux.ibm.com, martin.petersen@...cle.com,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Ye Bin <yebin10@...wei.com>
Subject: [PATCH v2 3/3] scsi: blocking IO when host is set blocked

From: Ye Bin <yebin10@...wei.com>

As previous patch introduce 'blocked' sysfs api to set 'host_blockio'.
If 'host_blockio' is true will blocking IO.

Signed-off-by: Ye Bin <yebin10@...wei.com>
---
 drivers/scsi/scsi_lib.c  | 2 ++
 include/scsi/scsi_host.h | 5 +++++
 2 files changed, 7 insertions(+)

diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index b7c569a42aa4..20d618300a46 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -1724,6 +1724,8 @@ static blk_status_t scsi_queue_rq(struct blk_mq_hw_ctx *hctx,
 	}
 
 	ret = BLK_STS_RESOURCE;
+	if (unlikely(scsi_host_blocked(shost)))
+		goto out_put_budget;
 	if (!scsi_target_queue_ready(shost, sdev))
 		goto out_put_budget;
 	if (unlikely(scsi_host_in_recovery(shost))) {
diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h
index 3e916dbac1cb..9fc30d0c48de 100644
--- a/include/scsi/scsi_host.h
+++ b/include/scsi/scsi_host.h
@@ -747,6 +747,11 @@ static inline int scsi_host_in_recovery(struct Scsi_Host *shost)
 		shost->tmf_in_progress;
 }
 
+static inline int scsi_host_blocked(struct Scsi_Host *shost)
+{
+	return shost->host_blockio;
+}
+
 extern int scsi_queue_work(struct Scsi_Host *, struct work_struct *);
 extern void scsi_flush_work(struct Scsi_Host *);
 
-- 
2.31.1