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Commit 64104f70 authored by Bart Van Assche's avatar Bart Van Assche Committed by Martin K. Petersen
Browse files

scsi: Call scsi_initialize_rq() for filesystem requests 



If a pass-through request is submitted then blk_get_request()
initializes that request by calling scsi_initialize_rq(). Also call this
function for filesystem requests. Introduce CMD_INITIALIZED to keep
track of whether or not a request has already been initialized.

Signed-off-by: default avatarBart Van Assche <bart.vanassche@wdc.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Brian King <brking@linux.vnet.ibm.com>
Cc: Hannes Reinecke <hare@suse.com>
Cc: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: default avatarJohannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
parent 3515832c

drivers/scsi/scsi_lib.c

+22 −4
Original line number Diff line number Diff line
@@ -642,6 +642,11 @@ static bool scsi_end_request(struct request *req, blk_status_t error, 
	if (blk_queue_add_random(q))

		add_disk_randomness(req->rq_disk);



	if (!blk_rq_is_scsi(req)) {

		WARN_ON_ONCE(!(cmd->flags & SCMD_INITIALIZED));

		cmd->flags &= ~SCMD_INITIALIZED;

	}



	if (req->mq_ctx) {

		/*

		 * In the MQ case the command gets freed by __blk_mq_end_request,
@@ -1110,7 +1115,8 @@ EXPORT_SYMBOL(scsi_init_io); 
 * scsi_initialize_rq - initialize struct scsi_cmnd.req

 * @rq: Request associated with the SCSI command to be initialized.

 *

 * Called from inside blk_get_request().

 * Called from inside blk_get_request() for pass-through requests and from

 * inside scsi_init_command() for filesystem requests.

 */

void scsi_initialize_rq(struct request *rq)

{
@@ -1154,7 +1160,13 @@ void scsi_init_command(struct scsi_device *dev, struct scsi_cmnd *cmd) 
{

	void *buf = cmd->sense_buffer;

	void *prot = cmd->prot_sdb;

	unsigned int unchecked_isa_dma = cmd->flags & SCMD_UNCHECKED_ISA_DMA;

	struct request *rq = blk_mq_rq_from_pdu(cmd);

	unsigned int flags = cmd->flags & SCMD_PRESERVED_FLAGS;



	if (!blk_rq_is_scsi(rq) && !(flags & SCMD_INITIALIZED)) {

		flags |= SCMD_INITIALIZED;

		scsi_initialize_rq(rq);

	}



	/* zero out the cmd, except for the embedded scsi_request */

	memset((char *)cmd + sizeof(cmd->req), 0,
@@ -1163,7 +1175,7 @@ void scsi_init_command(struct scsi_device *dev, struct scsi_cmnd *cmd) 
	cmd->device = dev;

	cmd->sense_buffer = buf;

	cmd->prot_sdb = prot;

	cmd->flags = unchecked_isa_dma;

	cmd->flags = flags;

	INIT_DELAYED_WORK(&cmd->abort_work, scmd_eh_abort_handler);

	cmd->jiffies_at_alloc = jiffies;
@@ -1350,6 +1362,8 @@ static int scsi_prep_fn(struct request_queue *q, struct request *req) 


	ret = scsi_setup_cmnd(sdev, req);

out:

	if (ret != BLKPREP_OK)

		cmd->flags &= ~SCMD_INITIALIZED;

	return scsi_prep_return(q, req, ret);

}
@@ -1869,6 +1883,7 @@ static int scsi_mq_prep_fn(struct request *req) 
	struct scsi_device *sdev = req->q->queuedata;

	struct Scsi_Host *shost = sdev->host;

	struct scatterlist *sg;

	int ret;



	scsi_init_command(sdev, cmd);
@@ -1902,7 +1917,10 @@ static int scsi_mq_prep_fn(struct request *req) 


	blk_mq_start_request(req);



	return scsi_setup_cmnd(sdev, req);

	ret = scsi_setup_cmnd(sdev, req);

	if (ret != BLK_STS_OK)

		cmd->flags &= ~SCMD_INITIALIZED;

	return ret;

}



static void scsi_mq_done(struct scsi_cmnd *cmd)

include/scsi/scsi_cmnd.h

+3 −0
Original line number Diff line number Diff line
@@ -57,6 +57,9 @@ struct scsi_pointer { 
/* for scmd->flags */

#define SCMD_TAGGED		(1 << 0)

#define SCMD_UNCHECKED_ISA_DMA	(1 << 1)

#define SCMD_INITIALIZED	(1 << 3)

/* flags preserved across unprep / reprep */

#define SCMD_PRESERVED_FLAGS	(SCMD_UNCHECKED_ISA_DMA | SCMD_INITIALIZED)



struct scsi_cmnd {

	struct scsi_request req;