96 строки
2.3 KiB
C
96 строки
2.3 KiB
C
|
// SPDX-License-Identifier: GPL-2.0
|
||
|
|
#include <linux/bsg.h>
|
||
|
|
#include <scsi/scsi.h>
|
||
|
|
#include <scsi/scsi_ioctl.h>
|
||
|
|
#include <scsi/scsi_cmnd.h>
|
||
|
|
#include <scsi/scsi_device.h>
|
||
|
|
#include <scsi/sg.h>
|
||
|
|
#include "scsi_priv.h"
|
||
|
|
|
||
|
|
#define uptr64(val) ((void __user *)(uintptr_t)(val))
|
||
|
|
|
||
|
|
static int scsi_bsg_check_proto(struct sg_io_v4 *hdr)
|
||
|
|
{
|
||
|
|
if (hdr->protocol != BSG_PROTOCOL_SCSI ||
|
||
|
|
hdr->subprotocol != BSG_SUB_PROTOCOL_SCSI_CMD)
|
||
|
|
return -EINVAL;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int scsi_bsg_fill_hdr(struct request *rq, struct sg_io_v4 *hdr,
|
||
|
|
fmode_t mode)
|
||
|
|
{
|
||
|
|
struct scsi_request *sreq = scsi_req(rq);
|
||
|
|
|
||
|
|
if (hdr->dout_xfer_len && hdr->din_xfer_len) {
|
||
|
|
pr_warn_once("BIDI support in bsg has been removed.\n");
|
||
|
|
return -EOPNOTSUPP;
|
||
|
|
}
|
||
|
|
|
||
|
|
sreq->cmd_len = hdr->request_len;
|
||
|
|
if (sreq->cmd_len > BLK_MAX_CDB) {
|
||
|
|
sreq->cmd = kzalloc(sreq->cmd_len, GFP_KERNEL);
|
||
|
|
if (!sreq->cmd)
|
||
|
|
return -ENOMEM;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (copy_from_user(sreq->cmd, uptr64(hdr->request), sreq->cmd_len))
|
||
|
|
return -EFAULT;
|
||
|
|
if (blk_verify_command(sreq->cmd, mode))
|
||
|
|
return -EPERM;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int scsi_bsg_complete_rq(struct request *rq, struct sg_io_v4 *hdr)
|
||
|
|
{
|
||
|
|
struct scsi_request *sreq = scsi_req(rq);
|
||
|
|
int ret = 0;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* fill in all the output members
|
||
|
|
*/
|
||
|
|
hdr->device_status = sreq->result & 0xff;
|
||
|
|
hdr->transport_status = host_byte(sreq->result);
|
||
|
|
hdr->driver_status = 0;
|
||
|
|
if (scsi_status_is_check_condition(sreq->result))
|
||
|
|
hdr->driver_status = DRIVER_SENSE;
|
||
|
|
hdr->info = 0;
|
||
|
|
if (hdr->device_status || hdr->transport_status || hdr->driver_status)
|
||
|
|
hdr->info |= SG_INFO_CHECK;
|
||
|
|
hdr->response_len = 0;
|
||
|
|
|
||
|
|
if (sreq->sense_len && hdr->response) {
|
||
|
|
int len = min_t(unsigned int, hdr->max_response_len,
|
||
|
|
sreq->sense_len);
|
||
|
|
|
||
|
|
if (copy_to_user(uptr64(hdr->response), sreq->sense, len))
|
||
|
|
ret = -EFAULT;
|
||
|
|
else
|
||
|
|
hdr->response_len = len;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (rq_data_dir(rq) == READ)
|
||
|
|
hdr->din_resid = sreq->resid_len;
|
||
|
|
else
|
||
|
|
hdr->dout_resid = sreq->resid_len;
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void scsi_bsg_free_rq(struct request *rq)
|
||
|
|
{
|
||
|
|
scsi_req_free_cmd(scsi_req(rq));
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct bsg_ops scsi_bsg_ops = {
|
||
|
|
.check_proto = scsi_bsg_check_proto,
|
||
|
|
.fill_hdr = scsi_bsg_fill_hdr,
|
||
|
|
.complete_rq = scsi_bsg_complete_rq,
|
||
|
|
.free_rq = scsi_bsg_free_rq,
|
||
|
|
};
|
||
|
|
|
||
|
|
int scsi_bsg_register_queue(struct request_queue *q, struct device *parent)
|
||
|
|
{
|
||
|
|
return bsg_register_queue(q, parent, dev_name(parent), &scsi_bsg_ops);
|
||
|
|
}
|