107 строки
2.6 KiB
C
107 строки
2.6 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_sg_io_fn(struct request_queue *q, struct sg_io_v4 *hdr,
|
|
fmode_t mode, unsigned int timeout)
|
|
{
|
|
struct scsi_request *sreq;
|
|
struct request *rq;
|
|
struct bio *bio;
|
|
int ret;
|
|
|
|
if (hdr->protocol != BSG_PROTOCOL_SCSI ||
|
|
hdr->subprotocol != BSG_SUB_PROTOCOL_SCSI_CMD)
|
|
return -EINVAL;
|
|
if (hdr->dout_xfer_len && hdr->din_xfer_len) {
|
|
pr_warn_once("BIDI support in bsg has been removed.\n");
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
rq = blk_get_request(q, hdr->dout_xfer_len ?
|
|
REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0);
|
|
if (IS_ERR(rq))
|
|
return PTR_ERR(rq);
|
|
rq->timeout = timeout;
|
|
|
|
ret = -ENOMEM;
|
|
sreq = scsi_req(rq);
|
|
sreq->cmd_len = hdr->request_len;
|
|
if (sreq->cmd_len > BLK_MAX_CDB) {
|
|
sreq->cmd = kzalloc(sreq->cmd_len, GFP_KERNEL);
|
|
if (!sreq->cmd)
|
|
goto out_put_request;
|
|
}
|
|
|
|
ret = -EFAULT;
|
|
if (copy_from_user(sreq->cmd, uptr64(hdr->request), sreq->cmd_len))
|
|
goto out_free_cmd;
|
|
ret = -EPERM;
|
|
if (!scsi_cmd_allowed(sreq->cmd, mode))
|
|
goto out_free_cmd;
|
|
|
|
ret = 0;
|
|
if (hdr->dout_xfer_len) {
|
|
ret = blk_rq_map_user(rq->q, rq, NULL, uptr64(hdr->dout_xferp),
|
|
hdr->dout_xfer_len, GFP_KERNEL);
|
|
} else if (hdr->din_xfer_len) {
|
|
ret = blk_rq_map_user(rq->q, rq, NULL, uptr64(hdr->din_xferp),
|
|
hdr->din_xfer_len, GFP_KERNEL);
|
|
}
|
|
|
|
if (ret)
|
|
goto out_free_cmd;
|
|
|
|
bio = rq->bio;
|
|
blk_execute_rq(NULL, rq, !(hdr->flags & BSG_FLAG_Q_AT_TAIL));
|
|
|
|
/*
|
|
* 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;
|
|
|
|
blk_rq_unmap_user(bio);
|
|
|
|
out_free_cmd:
|
|
scsi_req_free_cmd(scsi_req(rq));
|
|
out_put_request:
|
|
blk_put_request(rq);
|
|
return ret;
|
|
}
|
|
|
|
struct bsg_device *scsi_bsg_register_queue(struct scsi_device *sdev)
|
|
{
|
|
return bsg_register_queue(sdev->request_queue, &sdev->sdev_gendev,
|
|
dev_name(&sdev->sdev_gendev), scsi_bsg_sg_io_fn);
|
|
}
|