linux-kernel - [PATCH RFC v2 06/24] scsi: add scsi_cmd_from

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Date:   Wed, 11 Mar 2020 00:25:32 +0800
From:   John Garry <john.garry@...wei.com>
To:     <axboe@...nel.dk>, <jejb@...ux.ibm.com>,
        <martin.petersen@...cle.com>, <hare@...e.de>,
        <ming.lei@...hat.com>, <bvanassche@....org>, <hch@...radead.org>
CC:     <linux-block@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-scsi@...r.kernel.org>,
        <virtualization@...ts.linux-foundation.org>,
        <esc.storagedev@...rosemi.com>, <chenxiang66@...ilicon.com>,
        Hannes Reinecke <hare@...e.com>
Subject: [PATCH RFC v2 06/24] scsi: add scsi_cmd_from_priv()

From: Hannes Reinecke <hare@...e.com>

Add a functon to retrieve the scsi_cmnd structure from the driver
private allocation data.

Signed-off-by: Hannes Reinecke <hare@...e.com>
---
 include/scsi/scsi_cmnd.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/include/scsi/scsi_cmnd.h b/include/scsi/scsi_cmnd.h
index 82a4499539b3..c73280b3706d 100644
--- a/include/scsi/scsi_cmnd.h
+++ b/include/scsi/scsi_cmnd.h
@@ -153,6 +153,16 @@ static inline void *scsi_cmd_priv(struct scsi_cmnd *cmd)
 	return cmd + 1;
 }
 
+/*
+ * Return the scsi_cmnd structure located before the driver
+ * private allocation. Only works if cmd_size is set in the
+ * host template.
+ */
+static inline struct scsi_cmnd *scsi_cmd_from_priv(void *priv)
+{
+	return priv - sizeof(struct scsi_cmnd);
+}
+
 /* make sure not to use it with passthrough commands */
 static inline struct scsi_driver *scsi_cmd_to_driver(struct scsi_cmnd *cmd)
 {
-- 
2.17.1