Release 4.18 block/scsi_ioctl.c

/*
 * Copyright (C) 2001 Jens Axboe <axboe@suse.de>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 *
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public Licens
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-
 *
 */
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/module.h>
#include <linux/blkdev.h>
#include <linux/capability.h>
#include <linux/completion.h>
#include <linux/cdrom.h>
#include <linux/ratelimit.h>
#include <linux/slab.h>
#include <linux/times.h>
#include <linux/uio.h>
#include <linux/uaccess.h>

#include <scsi/scsi.h>
#include <scsi/scsi_ioctl.h>
#include <scsi/scsi_cmnd.h>


struct blk_cmd_filter {
	
unsigned long read_ok[BLK_SCSI_CMD_PER_LONG];
	
unsigned long write_ok[BLK_SCSI_CMD_PER_LONG];
};


static struct blk_cmd_filter blk_default_cmd_filter;

/* Command group 3 is reserved and should never be used.  */

const unsigned char scsi_command_size_tbl[8] =
{
	6, 10, 10, 12,
	16, 12, 10, 10
};
EXPORT_SYMBOL(scsi_command_size_tbl);

#include <scsi/sg.h>



static int sg_get_version(int __user *p)
{
	static const int sg_version_num = 30527;
	return put_user(sg_version_num, p);
}

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Linus Torvalds
24
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1
33.33%
Arjan van de Ven
1
3.85%
1
33.33%
Al Viro
1
3.85%
1
33.33%
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26
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3
100.00%



static int scsi_get_idlun(struct request_queue *q, int __user *p)
{
	return put_user(0, p);
}

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Linus Torvalds
21
87.50%
1
33.33%
Jens Axboe
2
8.33%
1
33.33%
Al Viro
1
4.17%
1
33.33%
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24
100.00%
3
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static int scsi_get_bus(struct request_queue *q, int __user *p)
{
	return put_user(0, p);
}

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Linus Torvalds
21
87.50%
1
33.33%
Jens Axboe
2
8.33%
1
33.33%
Al Viro
1
4.17%
1
33.33%
Total
24
100.00%
3
100.00%



static int sg_get_timeout(struct request_queue *q)
{
	return jiffies_to_clock_t(q->sg_timeout);
}

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Linus Torvalds
11
57.89%
1
25.00%
Jens Axboe
5
26.32%
2
50.00%
Milton D. Miller II
3
15.79%
1
25.00%
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19
100.00%
4
100.00%



static int sg_set_timeout(struct request_queue *q, int __user *p)
{
	int timeout, err = get_user(timeout, p);

	if (!err)
		q->sg_timeout = clock_t_to_jiffies(timeout);

	return err;
}

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Linus Torvalds
25
55.56%
1
20.00%
Jens Axboe
16
35.56%
2
40.00%
Milton D. Miller II
3
6.67%
1
20.00%
Al Viro
1
2.22%
1
20.00%
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45
100.00%
5
100.00%



static int max_sectors_bytes(struct request_queue *q)
{
	unsigned int max_sectors = queue_max_sectors(q);

	max_sectors = min_t(unsigned int, max_sectors, INT_MAX >> 9);

	return max_sectors << 9;
}

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37
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37
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static int sg_get_reserved_size(struct request_queue *q, int __user *p)
{
	int val = min_t(int, q->sg_reserved_size, max_sectors_bytes(q));

	return put_user(val, p);
}

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Linus Torvalds
18
43.90%
1
14.29%
Alan Stern
10
24.39%
1
14.29%
Akinobu Mita
5
12.20%
1
14.29%
Jens Axboe
5
12.20%
2
28.57%
Martin K. Petersen
2
4.88%
1
14.29%
Al Viro
1
2.44%
1
14.29%
Total
41
100.00%
7
100.00%



static int sg_set_reserved_size(struct request_queue *q, int __user *p)
{
	int size, err = get_user(size, p);

	if (err)
		return err;

	if (size < 0)
		return -EINVAL;

	q->sg_reserved_size = min(size, max_sectors_bytes(q));
	return 0;
}

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Linus Torvalds
31
50.00%
1
14.29%
Jens Axboe
15
24.19%
3
42.86%
Akinobu Mita
8
12.90%
1
14.29%
Pat LaVarre
7
11.29%
1
14.29%
Al Viro
1
1.61%
1
14.29%
Total
62
100.00%
7
100.00%

/*
 * will always return that we are ATAPI even for a real SCSI drive, I'm not
 * so sure this is worth doing anything about (why would you care??)
 */


static int sg_emulated_host(struct request_queue *q, int __user *p)
{
	return put_user(1, p);
}

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Linus Torvalds
21
87.50%
1
33.33%
Jens Axboe
2
8.33%
1
33.33%
Al Viro
1
4.17%
1
33.33%
Total
24
100.00%
3
100.00%



static void blk_set_cmd_filter_defaults(struct blk_cmd_filter *filter)
{
	/* Basic read-only commands */
	__set_bit(TEST_UNIT_READY, filter->read_ok);
	__set_bit(REQUEST_SENSE, filter->read_ok);
	__set_bit(READ_6, filter->read_ok);
	__set_bit(READ_10, filter->read_ok);
	__set_bit(READ_12, filter->read_ok);
	__set_bit(READ_16, filter->read_ok);
	__set_bit(READ_BUFFER, filter->read_ok);
	__set_bit(READ_DEFECT_DATA, filter->read_ok);
	__set_bit(READ_CAPACITY, filter->read_ok);
	__set_bit(READ_LONG, filter->read_ok);
	__set_bit(INQUIRY, filter->read_ok);
	__set_bit(MODE_SENSE, filter->read_ok);
	__set_bit(MODE_SENSE_10, filter->read_ok);
	__set_bit(LOG_SENSE, filter->read_ok);
	__set_bit(START_STOP, filter->read_ok);
	__set_bit(GPCMD_VERIFY_10, filter->read_ok);
	__set_bit(VERIFY_16, filter->read_ok);
	__set_bit(REPORT_LUNS, filter->read_ok);
	__set_bit(SERVICE_ACTION_IN_16, filter->read_ok);
	__set_bit(RECEIVE_DIAGNOSTIC, filter->read_ok);
	__set_bit(MAINTENANCE_IN, filter->read_ok);
	__set_bit(GPCMD_READ_BUFFER_CAPACITY, filter->read_ok);

	/* Audio CD commands */
	__set_bit(GPCMD_PLAY_CD, filter->read_ok);
	__set_bit(GPCMD_PLAY_AUDIO_10, filter->read_ok);
	__set_bit(GPCMD_PLAY_AUDIO_MSF, filter->read_ok);
	__set_bit(GPCMD_PLAY_AUDIO_TI, filter->read_ok);
	__set_bit(GPCMD_PAUSE_RESUME, filter->read_ok);

	/* CD/DVD data reading */
	__set_bit(GPCMD_READ_CD, filter->read_ok);
	__set_bit(GPCMD_READ_CD_MSF, filter->read_ok);
	__set_bit(GPCMD_READ_DISC_INFO, filter->read_ok);
	__set_bit(GPCMD_READ_CDVD_CAPACITY, filter->read_ok);
	__set_bit(GPCMD_READ_DVD_STRUCTURE, filter->read_ok);
	__set_bit(GPCMD_READ_HEADER, filter->read_ok);
	__set_bit(GPCMD_READ_TRACK_RZONE_INFO, filter->read_ok);
	__set_bit(GPCMD_READ_SUBCHANNEL, filter->read_ok);
	__set_bit(GPCMD_READ_TOC_PMA_ATIP, filter->read_ok);
	__set_bit(GPCMD_REPORT_KEY, filter->read_ok);
	__set_bit(GPCMD_SCAN, filter->read_ok);
	__set_bit(GPCMD_GET_CONFIGURATION, filter->read_ok);
	__set_bit(GPCMD_READ_FORMAT_CAPACITIES, filter->read_ok);
	__set_bit(GPCMD_GET_EVENT_STATUS_NOTIFICATION, filter->read_ok);
	__set_bit(GPCMD_GET_PERFORMANCE, filter->read_ok);
	__set_bit(GPCMD_SEEK, filter->read_ok);
	__set_bit(GPCMD_STOP_PLAY_SCAN, filter->read_ok);

	/* Basic writing commands */
	__set_bit(WRITE_6, filter->write_ok);
	__set_bit(WRITE_10, filter->write_ok);
	__set_bit(WRITE_VERIFY, filter->write_ok);
	__set_bit(WRITE_12, filter->write_ok);
	__set_bit(WRITE_VERIFY_12, filter->write_ok);
	__set_bit(WRITE_16, filter->write_ok);
	__set_bit(WRITE_LONG, filter->write_ok);
	__set_bit(WRITE_LONG_2, filter->write_ok);
	__set_bit(WRITE_SAME, filter->write_ok);
	__set_bit(WRITE_SAME_16, filter->write_ok);
	__set_bit(WRITE_SAME_32, filter->write_ok);
	__set_bit(ERASE, filter->write_ok);
	__set_bit(GPCMD_MODE_SELECT_10, filter->write_ok);
	__set_bit(MODE_SELECT, filter->write_ok);
	__set_bit(LOG_SELECT, filter->write_ok);
	__set_bit(GPCMD_BLANK, filter->write_ok);
	__set_bit(GPCMD_CLOSE_TRACK, filter->write_ok);
	__set_bit(GPCMD_FLUSH_CACHE, filter->write_ok);
	__set_bit(GPCMD_FORMAT_UNIT, filter->write_ok);
	__set_bit(GPCMD_REPAIR_RZONE_TRACK, filter->write_ok);
	__set_bit(GPCMD_RESERVE_RZONE_TRACK, filter->write_ok);
	__set_bit(GPCMD_SEND_DVD_STRUCTURE, filter->write_ok);
	__set_bit(GPCMD_SEND_EVENT, filter->write_ok);
	__set_bit(GPCMD_SEND_KEY, filter->write_ok);
	__set_bit(GPCMD_SEND_OPC, filter->write_ok);
	__set_bit(GPCMD_SEND_CUE_SHEET, filter->write_ok);
	__set_bit(GPCMD_SET_SPEED, filter->write_ok);
	__set_bit(GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL, filter->write_ok);
	__set_bit(GPCMD_LOAD_UNLOAD, filter->write_ok);
	__set_bit(GPCMD_SET_STREAMING, filter->write_ok);
	__set_bit(GPCMD_SET_READ_AHEAD, filter->write_ok);
}

Contributors
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FUJITA Tomonori
652
94.49%
2
33.33%
Mauricio Faria de Oliveira
27
3.91%
1
16.67%
Monty at xiph.org
9
1.30%
1
16.67%
Jens Axboe
1
0.14%
1
16.67%
Hannes Reinecke
1
0.14%
1
16.67%
Total
690
100.00%
6
100.00%



int blk_verify_command(unsigned char *cmd, fmode_t mode)
{
	struct blk_cmd_filter *filter = &blk_default_cmd_filter;

	/* root can do any command. */
	if (capable(CAP_SYS_RAWIO))
		return 0;

	/* Anybody who can open the device can do a read-safe command */
	if (test_bit(cmd[0], filter->read_ok))
		return 0;

	/* Write-safe commands require a writable open */
	if (test_bit(cmd[0], filter->write_ok) && (mode & FMODE_WRITE))
		return 0;

	return -EPERM;
}
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Jens Axboe
72
92.31%
1
50.00%
Christoph Hellwig
6
7.69%
1
50.00%
Total
78
100.00%
2
100.00%

EXPORT_SYMBOL(blk_verify_command);



static int blk_fill_sghdr_rq(struct request_queue *q, struct request *rq,
			     struct sg_io_hdr *hdr, fmode_t mode)
{
	struct scsi_request *req = scsi_req(rq);

	if (copy_from_user(req->cmd, hdr->cmdp, hdr->cmd_len))
		return -EFAULT;
	if (blk_verify_command(req->cmd, mode))
		return -EPERM;

	/*
         * fill in request structure
         */
	req->cmd_len = hdr->cmd_len;

	rq->timeout = msecs_to_jiffies(hdr->timeout);
	if (!rq->timeout)
		rq->timeout = q->sg_timeout;
	if (!rq->timeout)
		rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
	if (rq->timeout < BLK_MIN_SG_TIMEOUT)
		rq->timeout = BLK_MIN_SG_TIMEOUT;

	return 0;
}

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Jens Axboe
46
34.07%
7
38.89%
Linus Torvalds
44
32.59%
3
16.67%
Al Viro
15
11.11%
2
11.11%
Christoph Hellwig
13
9.63%
1
5.56%
Mike Christie
11
8.15%
1
5.56%
FUJITA Tomonori
3
2.22%
3
16.67%
Tejun Heo
3
2.22%
1
5.56%
Total
135
100.00%
18
100.00%



static int blk_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr,
				 struct bio *bio)
{
	struct scsi_request *req = scsi_req(rq);
	int r, ret = 0;

	/*
         * fill in all the output members
         */
	hdr->status = req->result & 0xff;
	hdr->masked_status = status_byte(req->result);
	hdr->msg_status = msg_byte(req->result);
	hdr->host_status = host_byte(req->result);
	hdr->driver_status = driver_byte(req->result);
	hdr->info = 0;
	if (hdr->masked_status || hdr->host_status || hdr->driver_status)
		hdr->info |= SG_INFO_CHECK;
	hdr->resid = req->resid_len;
	hdr->sb_len_wr = 0;

	if (req->sense_len && hdr->sbp) {
		int len = min((unsigned int) hdr->mx_sb_len, req->sense_len);

		if (!copy_to_user(hdr->sbp, req->sense, len))
			hdr->sb_len_wr = len;
		else
			ret = -EFAULT;
	}

	r = blk_rq_unmap_user(bio);
	if (!ret)
		ret = r;

	return ret;
}

Contributors
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CommitProp
Jens Axboe
154
73.33%
1
11.11%
Christoph Hellwig
24
11.43%
2
22.22%
FUJITA Tomonori
14
6.67%
2
22.22%
Mike Christie
11
5.24%
1
11.11%
Boaz Harrosh
4
1.90%
1
11.11%
Linus Torvalds
2
0.95%
1
11.11%
Tejun Heo
1
0.48%
1
11.11%
Total
210
100.00%
9
100.00%



static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
		struct sg_io_hdr *hdr, fmode_t mode)
{
	unsigned long start_time;
	ssize_t ret = 0;
	int writing = 0;
	int at_head = 0;
	struct request *rq;
	struct scsi_request *req;
	struct bio *bio;

	if (hdr->interface_id != 'S')
		return -EINVAL;

	if (hdr->dxfer_len > (queue_max_hw_sectors(q) << 9))
		return -EIO;

	if (hdr->dxfer_len)
		switch (hdr->dxfer_direction) {
		default:
			return -EINVAL;
		case SG_DXFER_TO_DEV:
			writing = 1;
			break;
		case SG_DXFER_TO_FROM_DEV:
		case SG_DXFER_FROM_DEV:
			break;
		}
	if (hdr->flags & SG_FLAG_Q_AT_HEAD)
		at_head = 1;

	ret = -ENOMEM;
	rq = blk_get_request(q, writing ? REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN, 0);
	if (IS_ERR(rq))
		return PTR_ERR(rq);
	req = scsi_req(rq);

	if (hdr->cmd_len > BLK_MAX_CDB) {
		req->cmd = kzalloc(hdr->cmd_len, GFP_KERNEL);
		if (!req->cmd)
			goto out_put_request;
	}

	ret = blk_fill_sghdr_rq(q, rq, hdr, mode);
	if (ret < 0)
		goto out_free_cdb;

	ret = 0;
	if (hdr->iovec_count) {
		struct iov_iter i;
		struct iovec *iov = NULL;

		ret = import_iovec(rq_data_dir(rq),
				   hdr->dxferp, hdr->iovec_count,
				   0, &iov, &i);
		if (ret < 0)
			goto out_free_cdb;

		/* SG_IO howto says that the shorter of the two wins */
		iov_iter_truncate(&i, hdr->dxfer_len);

		ret = blk_rq_map_user_iov(q, rq, NULL, &i, GFP_KERNEL);
		kfree(iov);
	} else if (hdr->dxfer_len)
		ret = blk_rq_map_user(q, rq, NULL, hdr->dxferp, hdr->dxfer_len,
				      GFP_KERNEL);

	if (ret)
		goto out_free_cdb;

	bio = rq->bio;
	req->retries = 0;

	start_time = jiffies;

	/* ignore return value. All information is passed back to caller
         * (if he doesn't check that is his problem).
         * N.B. a non-zero SCSI status is _not_ necessarily an error.
         */
	blk_execute_rq(q, bd_disk, rq, at_head);

	hdr->duration = jiffies_to_msecs(jiffies - start_time);

	ret = blk_complete_sghdr_rq(rq, hdr, bio);

out_free_cdb:
	scsi_req_free_cmd(req);
out_put_request:
	blk_put_request(rq);
	return ret;
}

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Jens Axboe
195
46.21%
9
24.32%
Christoph Hellwig
69
16.35%
6
16.22%
James Bottomley
39
9.24%
3
8.11%
Kent Overstreet
24
5.69%
2
5.41%
Douglas Gilbert
19
4.50%
2
5.41%
FUJITA Tomonori
14
3.32%
3
8.11%
Tejun Heo
14
3.32%
2
5.41%
Mike Christie
13
3.08%
2
5.41%
Al Viro
13
3.08%
2
5.41%
Joe Lawrence
7
1.66%
1
2.70%
Paolo Bonzini
6
1.42%
1
2.70%
Sabrina Dubroca
3
0.71%
1
2.70%
Martin K. Petersen
3
0.71%
1
2.70%
Christian Engelmayer
2
0.47%
1
2.70%
Patrick Mansfield
1
0.24%
1
2.70%
Total
422
100.00%
37
100.00%

/**
 * sg_scsi_ioctl  --  handle deprecated SCSI_IOCTL_SEND_COMMAND ioctl
 * @q:          request queue to send scsi commands down
 * @disk:       gendisk to operate on (option)
 * @mode:       mode used to open the file through which the ioctl has been
 *              submitted
 * @sic:        userspace structure describing the command to perform
 *
 * Send down the scsi command described by @sic to the device below
 * the request queue @q.  If @file is non-NULL it's used to perform
 * fine-grained permission checks that allow users to send down
 * non-destructive SCSI commands.  If the caller has a struct gendisk
 * available it should be passed in as @disk to allow the low level
 * driver to use the information contained in it.  A non-NULL @disk
 * is only allowed if the caller knows that the low level driver doesn't
 * need it (e.g. in the scsi subsystem).
 *
 * Notes:
 *   -  This interface is deprecated - users should use the SG_IO
 *      interface instead, as this is a more flexible approach to
 *      performing SCSI commands on a device.
 *   -  The SCSI command length is determined by examining the 1st byte
 *      of the given command. There is no way to override this.
 *   -  Data transfers are limited to PAGE_SIZE
 *   -  The length (x + y) must be at least OMAX_SB_LEN bytes long to
 *      accommodate the sense buffer when an error occurs.
 *      The sense buffer is truncated to OMAX_SB_LEN (16) bytes so that
 *      old code will not be surprised.
 *   -  If a Unix error occurs (e.g. ENOMEM) then the user will receive
 *      a negative return and the Unix error code in 'errno'.
 *      If the SCSI command succeeds then 0 is returned.
 *      Positive numbers returned are the compacted SCSI error codes (4
 *      bytes in one int) where the lowest byte is the SCSI status.
 */


int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode,
		struct scsi_ioctl_command __user *sic)
{
	

enum { OMAX_SB_LEN = 16 };	/* For backward compatibility */
	struct request *rq;
	struct scsi_request *req;
	int err;
	unsigned int in_len, out_len, bytes, opcode, cmdlen;
	char *buffer = NULL;

	if (!sic)
		return -EINVAL;

	/*
         * get in an out lengths, verify they don't exceed a page worth of data
         */
	if (get_user(in_len, &sic->inlen))
		return -EFAULT;
	if (get_user(out_len, &sic->outlen))
		return -EFAULT;
	if (in_len > PAGE_SIZE || out_len > PAGE_SIZE)
		return -EINVAL;
	if (get_user(opcode, sic->data))
		return -EFAULT;

	bytes = max(in_len, out_len);
	if (bytes) {
		buffer = kzalloc(bytes, q->bounce_gfp | GFP_USER| __GFP_NOWARN);
		if (!buffer)
			return -ENOMEM;

	}

	rq = blk_get_request(q, in_len ? REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN, 0);
	if (IS_ERR(rq)) {
		err = PTR_ERR(rq);
		goto error_free_buffer;
	}
	req = scsi_req(rq);

	cmdlen = COMMAND_SIZE(opcode);

	/*
         * get command and data to send to device, if any
         */
	err = -EFAULT;
	req->cmd_len = cmdlen;
	if (copy_from_user(req->cmd, sic->data, cmdlen))
		goto error;

	if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len))
		goto error;

	err = blk_verify_command(req->cmd, mode);
	if (err)
		goto error;

	/* default.  possible overriden later */
	req->retries = 5;

	switch (opcode) {
	case SEND_DIAGNOSTIC:
	case FORMAT_UNIT:
		rq->timeout = FORMAT_UNIT_TIMEOUT;
		req->retries = 1;
		break;
	case START_STOP:
		rq->timeout = START_STOP_TIMEOUT;
		break;
	case MOVE_MEDIUM:
		rq->timeout = MOVE_MEDIUM_TIMEOUT;
		break;
	case READ_ELEMENT_STATUS:
		rq->timeout = READ_ELEMENT_STATUS_TIMEOUT;
		break;
	case READ_DEFECT_DATA:
		rq->timeout = READ_DEFECT_DATA_TIMEOUT;
		req->retries = 1;
		break;
	default:
		rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
		break;
	}

	if (bytes && blk_rq_map_kern(q, rq, buffer, bytes, GFP_NOIO)) {
		err = DRIVER_ERROR << 24;
		goto error;
	}

	blk_execute_rq(q, disk, rq, 0);

	err = req->result & 0xff;	/* only 8 bit SCSI status */
	if (err) {
		if (req->sense_len && req->sense) {
			bytes = (OMAX_SB_LEN > req->sense_len) ?
				req->sense_len : OMAX_SB_LEN;
			if (copy_to_user(sic->data, req->sense, bytes))
				err = -EFAULT;
		}
	} else {
		if (copy_to_user(sic->data, buffer, out_len))
			err = -EFAULT;
	}
	
error:
	blk_put_request(rq);

error_free_buffer:
	kfree(buffer);

	return err;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Jens Axboe
288
55.92%
4
12.90%
Christoph Hellwig
87
16.89%
7
22.58%
Linus Torvalds
60
11.65%
3
9.68%
Douglas Gilbert
30
5.83%
2
6.45%
Joe Lawrence
18
3.50%
2
6.45%
Bart Van Assche
8
1.55%
1
3.23%
Tony Battersby
7
1.36%
1
3.23%
Al Viro
6
1.17%
3
9.68%
James Bottomley
4
0.78%
2
6.45%
FUJITA Tomonori
2
0.39%
2
6.45%
Alan Cox
2
0.39%
1
3.23%
Jan Kara
1
0.19%
1
3.23%
Patrick Mansfield
1
0.19%
1
3.23%
Yoann Padioleau
1
0.19%
1
3.23%
Total
515
100.00%
31
100.00%

EXPORT_SYMBOL_GPL(sg_scsi_ioctl);

/* Send basic block requests */


static int __blk_send_generic(struct request_queue *q, struct gendisk *bd_disk,
			      int cmd, int data)
{
	struct request *rq;
	int err;

	rq = blk_get_request(q, REQ_OP_SCSI_OUT, 0);
	if (IS_ERR(rq))
		return PTR_ERR(rq);
	rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
	scsi_req(rq)->cmd[0] = cmd;
	scsi_req(rq)->cmd[4] = data;
	scsi_req(rq)->cmd_len = 6;
	blk_execute_rq(q, bd_disk, rq, 0);
	err = scsi_req(rq)->result ? -EIO : 0;
	blk_put_request(rq);

	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Benjamin Collins
85
67.46%
1
10.00%
Christoph Hellwig
25
19.84%
5
50.00%
Joe Lawrence
13
10.32%
2
20.00%
Jens Axboe
3
2.38%
2
20.00%
Total
126
100.00%
10
100.00%



static inline int blk_send_start_stop(struct request_queue *q,
				      struct gendisk *bd_disk, int data)
{
	return __blk_send_generic(q, bd_disk, GPCMD_START_STOP_UNIT, data);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Benjamin Collins
30
93.75%
1
50.00%
Jens Axboe
2
6.25%
1
50.00%
Total
32
100.00%
2
100.00%



int scsi_cmd_ioctl(struct request_queue *q, struct gendisk *bd_disk, fmode_t mode,
		   unsigned int cmd, void __user *arg)
{
	int err;

	if (!q)
		return -ENXIO;

	switch (cmd) {
		/*
                 * new sgv3 interface
                 */
		case SG_GET_VERSION_NUM:
			err = sg_get_version(arg);
			break;
		case SCSI_IOCTL_GET_IDLUN:
			err = scsi_get_idlun(q, arg);
			break;
		case SCSI_IOCTL_GET_BUS_NUMBER:
			err = scsi_get_bus(q, arg);
			break;
		case SG_SET_TIMEOUT:
			err = sg_set_timeout(q, arg);
			break;
		case SG_GET_TIMEOUT:
			err = sg_get_timeout(q);
			break;
		case SG_GET_RESERVED_SIZE:
			err = sg_get_reserved_size(q, arg);
			break;
		case SG_SET_RESERVED_SIZE:
			err = sg_set_reserved_size(q, arg);
			break;
		case SG_EMULATED_HOST:
			err = sg_emulated_host(q, arg);
			break;
		case SG_IO: {
			struct sg_io_hdr hdr;

			err = -EFAULT;
			if (copy_from_user(&hdr, arg, sizeof(hdr)))
				break;
			err = <