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From: John Garry <john.garry@huawei.com>
To: <axboe@kernel.dk>, <jejb@linux.ibm.com>,
	<martin.petersen@oracle.com>, <hare@suse.de>,
	<ming.lei@redhat.com>, <bvanassche@acm.org>, <hch@infradead.org>
Cc: <linux-block@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
	<linux-scsi@vger.kernel.org>,
	<virtualization@lists.linux-foundation.org>,
	<esc.storagedev@microsemi.com>, <chenxiang66@hisilicon.com>,
	Hannes Reinecke <hare@suse.com>
Subject: [PATCH RFC v2 06/24] scsi: add scsi_cmd_from_priv()
Date: Wed, 11 Mar 2020 00:25:32 +0800	[thread overview]
Message-ID: <1583857550-12049-7-git-send-email-john.garry@huawei.com> (raw)
In-Reply-To: <1583857550-12049-1-git-send-email-john.garry@huawei.com>

From: Hannes Reinecke <hare@suse.com>

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

Signed-off-by: Hannes Reinecke <hare@suse.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


  parent reply	other threads:[~2020-03-10 16:31 UTC|newest]

Thread overview: 49+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-10 16:25 [PATCH RFC v2 00/24] scsi: enable reserved commands for LLDDs John Garry
2020-03-10 16:25 ` [PATCH RFC v2 01/24] scsi: add 'nr_reserved_cmds' field to the SCSI host template John Garry
2020-03-10 23:08   ` Ming Lei
2020-03-11  6:55     ` Hannes Reinecke
2020-03-11  8:00       ` Ming Lei
2020-03-10 16:25 ` [PATCH RFC v2 02/24] scsi: allocate separate queue for reserved commands John Garry
2020-03-10 18:32   ` Christoph Hellwig
2020-03-10 21:08     ` John Garry
2020-03-11  6:22       ` Christoph Hellwig
2020-03-11  6:58         ` Hannes Reinecke
2020-03-11  7:51           ` John Garry
2020-04-06  9:05         ` Hannes Reinecke
2020-04-07 11:54           ` John Garry
2020-04-07 14:00             ` Hannes Reinecke
2020-04-07 14:35               ` John Garry
2020-04-07 14:45                 ` Hannes Reinecke
2020-04-07 15:19                   ` John Garry
2020-04-07 16:30               ` Christoph Hellwig
2020-04-23 14:13                 ` John Garry
2020-04-23 14:49                   ` Hannes Reinecke
2020-04-23 15:33                     ` John Garry
2020-03-10 16:25 ` [PATCH RFC v2 03/24] blk-mq: Implement blk_mq_rq_is_reserved() John Garry
2020-03-10 16:25 ` [PATCH RFC v2 04/24] scsi: Add scsi_{get, put}_reserved_cmd() John Garry
2020-03-10 16:25 ` [PATCH RFC v2 05/24] csiostor: use reserved command for LUN reset John Garry
2020-03-10 16:25 ` John Garry [this message]
2020-03-10 16:25 ` [PATCH RFC v2 07/24] virtio_scsi: use reserved commands for TMF John Garry
2020-03-10 16:25 ` [PATCH RFC v2 08/24] scsi: add host tagset busy iterator John Garry
2020-03-10 16:25 ` [PATCH RFC v2 09/24] fnic: use reserved commands John Garry
2020-03-10 16:25 ` [PATCH RFC v2 10/24] fnic: use scsi_host_tagset_busy_iter() to traverse commands John Garry
2020-03-10 16:25 ` [PATCH RFC v2 11/24] hpsa: move hpsa_hba_inquiry after scsi_add_host() John Garry
2020-03-10 16:25 ` [PATCH RFC v2 12/24] hpsa: use reserved commands John Garry
2020-03-11  8:10   ` Ming Lei
2020-03-17  9:38     ` John Garry
2020-03-17  9:48       ` Hannes Reinecke
2020-03-30 13:42         ` John Garry
2020-03-10 16:25 ` [PATCH RFC v2 13/24] hpsa: use blk_mq_tagset_busy_iter() to traverse outstanding commands John Garry
2020-03-10 16:25 ` [PATCH RFC v2 14/24] hpsa: drop refcount field from CommandList John Garry
2020-03-10 16:25 ` [PATCH RFC v2 15/24] snic: use reserved commands John Garry
2020-03-10 16:25 ` [PATCH RFC v2 16/24] snic: use tagset iter for traversing commands John Garry
2020-03-10 16:25 ` [PATCH RFC v2 17/24] aacraid: move scsi_add_host() John Garry
2020-03-10 16:25 ` [PATCH RFC v2 18/24] aacraid: use private commands John Garry
2020-03-10 16:25 ` [PATCH RFC v2 19/24] aacraid: replace cmd_list with scsi_host_tagset_busy_iter() John Garry
2020-03-10 16:25 ` [PATCH RFC v2 20/24] aacraid: use scsi_host_tagset_busy_iter() to traverse outstanding commands John Garry
2020-03-10 16:25 ` [PATCH RFC v2 21/24] dpt_i2o: drop cmd_list usage John Garry
2020-03-10 16:25 ` [PATCH RFC v2 22/24] scsi: drop scsi command list John Garry
2020-03-10 18:35   ` Christoph Hellwig
2020-03-10 20:47     ` John Garry
2020-03-10 16:25 ` [PATCH RFC v2 23/24] scsi: libsas: aic94xx: hisi_sas: mvsas: pm8001: Allocate Scsi_cmd for slow task John Garry
2020-03-10 16:25 ` [PATCH RFC v2 24/24] scsi: hisi_sas: Use libsas slow task SCSI command John Garry

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