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bsg: add SCSI transport-level request support 

This enables bsg to handle SCSI transport-level request like SAS
management protocol (SMP).

- add BSG_SUB_PROTOCOL_{SCSI_CMD, SCSI_TMF, SCSI_TRANSPORT} definitions.
- SCSI transport-level requests skip blk_verify_command().

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
FUJITA Tomonori 2007-07-16 08:52:16 +02:00 committed by Jens Axboe
parent 2c9ecdf40a
commit 15d10b611f
2 changed files with 27 additions and 6 deletions
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25
block/bsg.c
View File

@ -208,8 +208,12 @@ static int blk_fill_sgv4_hdr_rq(request_queue_t *q, struct request *rq,
if (copy_from_user(rq->cmd, (void *)(unsigned long)hdr->request,
hdr->request_len))
return -EFAULT;
if (hdr->subprotocol == BSG_SUB_PROTOCOL_SCSI_CMD) {
if (blk_verify_command(rq->cmd, has_write_perm))
return -EPERM;
} else if (!capable(CAP_SYS_RAWIO))
return -EPERM;
/*
* fill in request structure
@ -232,6 +236,8 @@ static int blk_fill_sgv4_hdr_rq(request_queue_t *q, struct request *rq,
static int
bsg_validate_sgv4_hdr(request_queue_t *q, struct sg_io_v4 *hdr, int *rw)
{
int ret = 0;
if (hdr->guard != 'Q')
return -EINVAL;
if (hdr->request_len > BLK_MAX_CDB)
@ -240,13 +246,22 @@ bsg_validate_sgv4_hdr(request_queue_t *q, struct sg_io_v4 *hdr, int *rw)
hdr->din_xfer_len > (q->max_sectors << 9))
return -EIO;
/* not supported currently */
if (hdr->protocol || hdr->subprotocol)
return -EINVAL;
switch (hdr->protocol) {
case BSG_PROTOCOL_SCSI:
switch (hdr->subprotocol) {
case BSG_SUB_PROTOCOL_SCSI_CMD:
case BSG_SUB_PROTOCOL_SCSI_TRANSPORT:
break;
default:
ret = -EINVAL;
}
break;
default:
ret = -EINVAL;
}
*rw = hdr->dout_xfer_len ? WRITE : READ;
return 0;
return ret;
}
/*

6
include/linux/bsg.h
View File

@ -1,6 +1,12 @@
#ifndef BSG_H
#define BSG_H
#define BSG_PROTOCOL_SCSI 0
#define BSG_SUB_PROTOCOL_SCSI_CMD 0
#define BSG_SUB_PROTOCOL_SCSI_TMF 1
#define BSG_SUB_PROTOCOL_SCSI_TRANSPORT 2
struct sg_io_v4 {
__s32 guard; /* [i] 'Q' to differentiate from v3 */
__u32 protocol; /* [i] 0 -> SCSI , .... */