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block: split scsi_request out of struct request

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And require all drivers that want to support BLOCK_PC to allocate it
as the first thing of their private data.  To support this the legacy
IDE and BSG code is switched to set cmd_size on their queues to let
the block layer allocate the additional space.

Signed-off-by: Christoph Hellwig <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Christoph Hellwig 2017-01-27 09:46:29 +01:00 • committed by Jens Axboe
commit 82ed4db499
49 changed files with 458 additions and 410 deletions
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2
include/scsi/scsi_cmnd.h
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@ -8,6 +8,7 @@
#include <linux/timer.h>
#include <linux/scatterlist.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_request.h>
struct Scsi_Host;
struct scsi_driver;
@ -57,6 +58,7 @@ struct scsi_pointer {
#define SCMD_TAGGED (1 << 0)
struct scsi_cmnd {
struct scsi_request req;
struct scsi_device *device;
struct list_head list; /* scsi_cmnd participates in queue lists */
struct list_head eh_entry; /* entry for the host eh_cmd_q */

30
include/scsi/scsi_request.h Normal file
View file

@ -0,0 +1,30 @@
#ifndef _SCSI_SCSI_REQUEST_H
#define _SCSI_SCSI_REQUEST_H
#include <linux/blk-mq.h>
#define BLK_MAX_CDB 16
struct scsi_request {
unsigned char __cmd[BLK_MAX_CDB];
unsigned char *cmd;
unsigned short cmd_len;
unsigned int sense_len;
unsigned int resid_len; /* residual count */
void *sense;
};
static inline struct scsi_request *scsi_req(struct request *rq)
{
return blk_mq_rq_to_pdu(rq);
}
static inline void scsi_req_free_cmd(struct scsi_request *req)
{
if (req->cmd != req->__cmd)
kfree(req->cmd);
}
void scsi_req_init(struct request *);
#endif /* _SCSI_SCSI_REQUEST_H */