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Commit b54197c4 authored by Christoph Hellwig's avatar Christoph Hellwig
Browse files

virtio_scsi: use cmd_size 



Taken almost entirely from Nicholas Bellinger's scsi-mq conversion.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Acked-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
Reviewed-by: default avatarNicholas Bellinger <nab@linux-iscsi.org>
parent fdbcbcab

drivers/scsi/virtio_scsi.c

+7 −18
Original line number Diff line number Diff line
@@ -199,7 +199,6 @@ static void virtscsi_complete_cmd(struct virtio_scsi *vscsi, void *buf) 
			set_driver_byte(sc, DRIVER_SENSE);

	}



	mempool_free(cmd, virtscsi_cmd_pool);

	sc->scsi_done(sc);



	atomic_dec(&tgt->reqs);
@@ -242,8 +241,6 @@ static void virtscsi_complete_free(struct virtio_scsi *vscsi, void *buf) 


	if (cmd->comp)

		complete_all(cmd->comp);

	else

		mempool_free(cmd, virtscsi_cmd_pool);

}



static void virtscsi_ctrl_done(struct virtqueue *vq)
@@ -459,10 +456,9 @@ static int virtscsi_queuecommand(struct virtio_scsi *vscsi, 
				 struct virtio_scsi_vq *req_vq,

				 struct scsi_cmnd *sc)

{

	struct virtio_scsi_cmd *cmd;

	int ret;



	struct Scsi_Host *shost = virtio_scsi_host(vscsi->vdev);

	struct virtio_scsi_cmd *cmd = scsi_cmd_priv(sc);



	BUG_ON(scsi_sg_count(sc) > shost->sg_tablesize);



	/* TODO: check feature bit and fail if unsupported?  */
@@ -471,11 +467,6 @@ static int virtscsi_queuecommand(struct virtio_scsi *vscsi, 
	dev_dbg(&sc->device->sdev_gendev,

		"cmd %p CDB: %#02x\n", sc, sc->cmnd[0]);



	ret = SCSI_MLQUEUE_HOST_BUSY;

	cmd = mempool_alloc(virtscsi_cmd_pool, GFP_ATOMIC);

	if (!cmd)

		goto out;



	memset(cmd, 0, sizeof(*cmd));

	cmd->sc = sc;

	cmd->req.cmd = (struct virtio_scsi_cmd_req){
@@ -494,13 +485,9 @@ static int virtscsi_queuecommand(struct virtio_scsi *vscsi, 


	if (virtscsi_kick_cmd(req_vq, cmd,

			      sizeof cmd->req.cmd, sizeof cmd->resp.cmd,

			      GFP_ATOMIC) == 0)

		ret = 0;

	else

		mempool_free(cmd, virtscsi_cmd_pool);



out:

	return ret;

			      GFP_ATOMIC) != 0)

		return SCSI_MLQUEUE_HOST_BUSY;

	return 0;

}



static int virtscsi_queuecommand_single(struct Scsi_Host *sh,
@@ -642,6 +629,7 @@ static struct scsi_host_template virtscsi_host_template_single = { 
	.name = "Virtio SCSI HBA",

	.proc_name = "virtio_scsi",

	.this_id = -1,

	.cmd_size = sizeof(struct virtio_scsi_cmd),

	.queuecommand = virtscsi_queuecommand_single,

	.eh_abort_handler = virtscsi_abort,

	.eh_device_reset_handler = virtscsi_device_reset,
@@ -658,6 +646,7 @@ static struct scsi_host_template virtscsi_host_template_multi = { 
	.name = "Virtio SCSI HBA",

	.proc_name = "virtio_scsi",

	.this_id = -1,

	.cmd_size = sizeof(struct virtio_scsi_cmd),

	.queuecommand = virtscsi_queuecommand_multi,

	.eh_abort_handler = virtscsi_abort,

	.eh_device_reset_handler = virtscsi_device_reset,

include/scsi/scsi_cmnd.h

+9 −0
Original line number Diff line number Diff line
@@ -133,6 +133,15 @@ struct scsi_cmnd { 
	unsigned char tag;	/* SCSI-II queued command tag */

};



/*

 * Return the driver private allocation behind the command.

 * Only works if cmd_size is set in the host template.

 */

static inline void *scsi_cmd_priv(struct scsi_cmnd *cmd)

{

	return cmd + 1;

}



/* make sure not to use it with REQ_TYPE_BLOCK_PC commands */

static inline struct scsi_driver *scsi_cmd_to_driver(struct scsi_cmnd *cmd)

{