blob: 78199c08ec92fc7c23549ef41c7d5b0862cfb938 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Copyright (C) 2001 Jens Axboe <axboe@suse.de>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 *
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public Licens
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-
17 *
18 */
19#include <linux/kernel.h>
20#include <linux/errno.h>
21#include <linux/string.h>
22#include <linux/module.h>
23#include <linux/blkdev.h>
Randy.Dunlapc59ede72006-01-11 12:17:46 -080024#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#include <linux/completion.h>
26#include <linux/cdrom.h>
27#include <linux/slab.h>
28#include <linux/times.h>
29#include <asm/uaccess.h>
30
31#include <scsi/scsi.h>
32#include <scsi/scsi_ioctl.h>
33#include <scsi/scsi_cmnd.h>
34
35/* Command group 3 is reserved and should never be used. */
Boaz Harroshdb4742d2008-04-30 11:27:26 +030036const unsigned char scsi_command_size_tbl[8] =
Linus Torvalds1da177e2005-04-16 15:20:36 -070037{
38 6, 10, 10, 12,
39 16, 12, 10, 10
40};
Boaz Harroshdb4742d2008-04-30 11:27:26 +030041EXPORT_SYMBOL(scsi_command_size_tbl);
Linus Torvalds1da177e2005-04-16 15:20:36 -070042
Linus Torvalds1da177e2005-04-16 15:20:36 -070043#include <scsi/sg.h>
44
45static int sg_get_version(int __user *p)
46{
Arjan van de Ven64100092006-01-06 09:46:02 +010047 static const int sg_version_num = 30527;
Linus Torvalds1da177e2005-04-16 15:20:36 -070048 return put_user(sg_version_num, p);
49}
50
Jens Axboe165125e2007-07-24 09:28:11 +020051static int scsi_get_idlun(struct request_queue *q, int __user *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -070052{
53 return put_user(0, p);
54}
55
Jens Axboe165125e2007-07-24 09:28:11 +020056static int scsi_get_bus(struct request_queue *q, int __user *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -070057{
58 return put_user(0, p);
59}
60
Jens Axboe165125e2007-07-24 09:28:11 +020061static int sg_get_timeout(struct request_queue *q)
Linus Torvalds1da177e2005-04-16 15:20:36 -070062{
63 return q->sg_timeout / (HZ / USER_HZ);
64}
65
Jens Axboe165125e2007-07-24 09:28:11 +020066static int sg_set_timeout(struct request_queue *q, int __user *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -070067{
68 int timeout, err = get_user(timeout, p);
69
70 if (!err)
71 q->sg_timeout = timeout * (HZ / USER_HZ);
72
73 return err;
74}
75
Jens Axboe165125e2007-07-24 09:28:11 +020076static int sg_get_reserved_size(struct request_queue *q, int __user *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -070077{
Alan Stern44ec9542007-02-20 11:01:57 -050078 unsigned val = min(q->sg_reserved_size, q->max_sectors << 9);
79
80 return put_user(val, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -070081}
82
Jens Axboe165125e2007-07-24 09:28:11 +020083static int sg_set_reserved_size(struct request_queue *q, int __user *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -070084{
85 int size, err = get_user(size, p);
86
87 if (err)
88 return err;
89
90 if (size < 0)
91 return -EINVAL;
92 if (size > (q->max_sectors << 9))
93 size = q->max_sectors << 9;
94
95 q->sg_reserved_size = size;
96 return 0;
97}
98
99/*
100 * will always return that we are ATAPI even for a real SCSI drive, I'm not
101 * so sure this is worth doing anything about (why would you care??)
102 */
Jens Axboe165125e2007-07-24 09:28:11 +0200103static int sg_emulated_host(struct request_queue *q, int __user *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104{
105 return put_user(1, p);
106}
107
108#define CMD_READ_SAFE 0x01
109#define CMD_WRITE_SAFE 0x02
110#define CMD_WARNED 0x04
111#define safe_for_read(cmd) [cmd] = CMD_READ_SAFE
112#define safe_for_write(cmd) [cmd] = CMD_WRITE_SAFE
113
FUJITA Tomonori337ad412006-12-20 11:18:54 +0100114int blk_verify_command(unsigned char *cmd, int has_write_perm)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115{
116 static unsigned char cmd_type[256] = {
117
118 /* Basic read-only commands */
119 safe_for_read(TEST_UNIT_READY),
120 safe_for_read(REQUEST_SENSE),
121 safe_for_read(READ_6),
122 safe_for_read(READ_10),
123 safe_for_read(READ_12),
124 safe_for_read(READ_16),
125 safe_for_read(READ_BUFFER),
Douglas Gilbert942fc2f2005-09-09 20:07:32 +1000126 safe_for_read(READ_DEFECT_DATA),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 safe_for_read(READ_LONG),
128 safe_for_read(INQUIRY),
129 safe_for_read(MODE_SENSE),
130 safe_for_read(MODE_SENSE_10),
131 safe_for_read(LOG_SENSE),
132 safe_for_read(START_STOP),
133 safe_for_read(GPCMD_VERIFY_10),
134 safe_for_read(VERIFY_16),
135
136 /* Audio CD commands */
137 safe_for_read(GPCMD_PLAY_CD),
138 safe_for_read(GPCMD_PLAY_AUDIO_10),
139 safe_for_read(GPCMD_PLAY_AUDIO_MSF),
140 safe_for_read(GPCMD_PLAY_AUDIO_TI),
141 safe_for_read(GPCMD_PAUSE_RESUME),
142
143 /* CD/DVD data reading */
144 safe_for_read(GPCMD_READ_BUFFER_CAPACITY),
145 safe_for_read(GPCMD_READ_CD),
146 safe_for_read(GPCMD_READ_CD_MSF),
147 safe_for_read(GPCMD_READ_DISC_INFO),
148 safe_for_read(GPCMD_READ_CDVD_CAPACITY),
149 safe_for_read(GPCMD_READ_DVD_STRUCTURE),
150 safe_for_read(GPCMD_READ_HEADER),
151 safe_for_read(GPCMD_READ_TRACK_RZONE_INFO),
152 safe_for_read(GPCMD_READ_SUBCHANNEL),
153 safe_for_read(GPCMD_READ_TOC_PMA_ATIP),
154 safe_for_read(GPCMD_REPORT_KEY),
155 safe_for_read(GPCMD_SCAN),
156 safe_for_read(GPCMD_GET_CONFIGURATION),
157 safe_for_read(GPCMD_READ_FORMAT_CAPACITIES),
158 safe_for_read(GPCMD_GET_EVENT_STATUS_NOTIFICATION),
159 safe_for_read(GPCMD_GET_PERFORMANCE),
160 safe_for_read(GPCMD_SEEK),
161 safe_for_read(GPCMD_STOP_PLAY_SCAN),
162
163 /* Basic writing commands */
164 safe_for_write(WRITE_6),
165 safe_for_write(WRITE_10),
166 safe_for_write(WRITE_VERIFY),
167 safe_for_write(WRITE_12),
168 safe_for_write(WRITE_VERIFY_12),
169 safe_for_write(WRITE_16),
170 safe_for_write(WRITE_LONG),
Thomas Maguin0faf3d32005-09-16 19:27:58 -0700171 safe_for_write(WRITE_LONG_2),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 safe_for_write(ERASE),
173 safe_for_write(GPCMD_MODE_SELECT_10),
174 safe_for_write(MODE_SELECT),
175 safe_for_write(LOG_SELECT),
176 safe_for_write(GPCMD_BLANK),
177 safe_for_write(GPCMD_CLOSE_TRACK),
178 safe_for_write(GPCMD_FLUSH_CACHE),
179 safe_for_write(GPCMD_FORMAT_UNIT),
180 safe_for_write(GPCMD_REPAIR_RZONE_TRACK),
181 safe_for_write(GPCMD_RESERVE_RZONE_TRACK),
182 safe_for_write(GPCMD_SEND_DVD_STRUCTURE),
183 safe_for_write(GPCMD_SEND_EVENT),
184 safe_for_write(GPCMD_SEND_KEY),
185 safe_for_write(GPCMD_SEND_OPC),
186 safe_for_write(GPCMD_SEND_CUE_SHEET),
187 safe_for_write(GPCMD_SET_SPEED),
188 safe_for_write(GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL),
189 safe_for_write(GPCMD_LOAD_UNLOAD),
190 safe_for_write(GPCMD_SET_STREAMING),
191 };
192 unsigned char type = cmd_type[cmd[0]];
193
194 /* Anybody who can open the device can do a read-safe command */
195 if (type & CMD_READ_SAFE)
196 return 0;
197
198 /* Write-safe commands just require a writable open.. */
Jens Axboe5a57be82006-01-09 14:52:21 +0100199 if ((type & CMD_WRITE_SAFE) && has_write_perm)
200 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201
Jens Axboe3b0e77b2005-10-07 19:41:34 +0200202 /* And root can do any command.. */
203 if (capable(CAP_SYS_RAWIO))
204 return 0;
205
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206 if (!type) {
207 cmd_type[cmd[0]] = CMD_WARNED;
208 printk(KERN_WARNING "scsi: unknown opcode 0x%02x\n", cmd[0]);
209 }
210
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 /* Otherwise fail it with an "Operation not permitted" */
212 return -EPERM;
213}
FUJITA Tomonori337ad412006-12-20 11:18:54 +0100214EXPORT_SYMBOL_GPL(blk_verify_command);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215
Jens Axboe165125e2007-07-24 09:28:11 +0200216static int blk_fill_sghdr_rq(struct request_queue *q, struct request *rq,
FUJITA Tomonori41e17032007-07-22 10:06:50 +0900217 struct sg_io_hdr *hdr, int has_write_perm)
Jens Axboe3d6392c2007-07-09 12:38:05 +0200218{
Jens Axboe3d6392c2007-07-09 12:38:05 +0200219 if (copy_from_user(rq->cmd, hdr->cmdp, hdr->cmd_len))
220 return -EFAULT;
FUJITA Tomonori337ad412006-12-20 11:18:54 +0100221 if (blk_verify_command(rq->cmd, has_write_perm))
Jens Axboe3d6392c2007-07-09 12:38:05 +0200222 return -EPERM;
223
224 /*
225 * fill in request structure
226 */
227 rq->cmd_len = hdr->cmd_len;
228 rq->cmd_type = REQ_TYPE_BLOCK_PC;
229
Tejun Heo24bb8fb2007-12-05 21:28:24 +0100230 rq->timeout = msecs_to_jiffies(hdr->timeout);
Jens Axboe3d6392c2007-07-09 12:38:05 +0200231 if (!rq->timeout)
232 rq->timeout = q->sg_timeout;
233 if (!rq->timeout)
234 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
235
236 return 0;
237}
Jens Axboe3d6392c2007-07-09 12:38:05 +0200238
239/*
240 * unmap a request that was previously mapped to this sg_io_hdr. handles
241 * both sg and non-sg sg_io_hdr.
242 */
FUJITA Tomonori41e17032007-07-22 10:06:50 +0900243static int blk_unmap_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr)
Jens Axboe3d6392c2007-07-09 12:38:05 +0200244{
FUJITA Tomonoriac6b91b2006-12-20 11:17:43 +0100245 blk_rq_unmap_user(rq->bio);
Jens Axboe3d6392c2007-07-09 12:38:05 +0200246 blk_put_request(rq);
247 return 0;
248}
Jens Axboe3d6392c2007-07-09 12:38:05 +0200249
FUJITA Tomonori41e17032007-07-22 10:06:50 +0900250static int blk_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr,
251 struct bio *bio)
Jens Axboe3d6392c2007-07-09 12:38:05 +0200252{
253 int r, ret = 0;
254
255 /*
256 * fill in all the output members
257 */
258 hdr->status = rq->errors & 0xff;
259 hdr->masked_status = status_byte(rq->errors);
260 hdr->msg_status = msg_byte(rq->errors);
261 hdr->host_status = host_byte(rq->errors);
262 hdr->driver_status = driver_byte(rq->errors);
263 hdr->info = 0;
264 if (hdr->masked_status || hdr->host_status || hdr->driver_status)
265 hdr->info |= SG_INFO_CHECK;
FUJITA Tomonori7a85f882008-03-04 11:17:11 +0100266 hdr->resid = rq->data_len;
Jens Axboe3d6392c2007-07-09 12:38:05 +0200267 hdr->sb_len_wr = 0;
268
269 if (rq->sense_len && hdr->sbp) {
270 int len = min((unsigned int) hdr->mx_sb_len, rq->sense_len);
271
272 if (!copy_to_user(hdr->sbp, rq->sense, len))
273 hdr->sb_len_wr = len;
274 else
275 ret = -EFAULT;
276 }
277
278 rq->bio = bio;
279 r = blk_unmap_sghdr_rq(rq, hdr);
280 if (ret)
281 r = ret;
282
283 return r;
284}
Jens Axboe3d6392c2007-07-09 12:38:05 +0200285
Jens Axboe165125e2007-07-24 09:28:11 +0200286static int sg_io(struct file *file, struct request_queue *q,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287 struct gendisk *bd_disk, struct sg_io_hdr *hdr)
288{
Jens Axboe3d6392c2007-07-09 12:38:05 +0200289 unsigned long start_time;
290 int writing = 0, ret = 0, has_write_perm = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 struct request *rq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292 char sense[SCSI_SENSE_BUFFERSIZE];
FUJITA Tomonori77d172c2006-12-11 10:01:34 +0100293 struct bio *bio;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294
295 if (hdr->interface_id != 'S')
296 return -EINVAL;
297 if (hdr->cmd_len > BLK_MAX_CDB)
298 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299
Mike Christiedefd94b2005-12-05 02:37:06 -0600300 if (hdr->dxfer_len > (q->max_hw_sectors << 9))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301 return -EIO;
302
James Bottomley f1970ba2005-06-20 14:06:52 +0200303 if (hdr->dxfer_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304 switch (hdr->dxfer_direction) {
305 default:
306 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 case SG_DXFER_TO_DEV:
308 writing = 1;
309 break;
Jens Axboe616e8a02006-11-13 18:04:59 +0100310 case SG_DXFER_TO_FROM_DEV:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 case SG_DXFER_FROM_DEV:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 break;
313 }
314
Jens Axboedd1cab92005-06-20 14:06:01 +0200315 rq = blk_get_request(q, writing ? WRITE : READ, GFP_KERNEL);
316 if (!rq)
317 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318
Jens Axboe3d6392c2007-07-09 12:38:05 +0200319 if (file)
320 has_write_perm = file->f_mode & FMODE_WRITE;
Mike Christie0e75f902006-12-01 10:40:55 +0100321
Jens Axboe3d6392c2007-07-09 12:38:05 +0200322 if (blk_fill_sghdr_rq(q, rq, hdr, has_write_perm)) {
Jens Axboe3d6392c2007-07-09 12:38:05 +0200323 blk_put_request(rq);
324 return -EFAULT;
325 }
Mike Christie0e75f902006-12-01 10:40:55 +0100326
James Bottomley f1970ba2005-06-20 14:06:52 +0200327 if (hdr->iovec_count) {
328 const int size = sizeof(struct sg_iovec) * hdr->iovec_count;
329 struct sg_iovec *iov;
330
331 iov = kmalloc(size, GFP_KERNEL);
332 if (!iov) {
333 ret = -ENOMEM;
Jens Axboedd1cab92005-06-20 14:06:01 +0200334 goto out;
James Bottomley f1970ba2005-06-20 14:06:52 +0200335 }
336
337 if (copy_from_user(iov, hdr->dxferp, size)) {
338 kfree(iov);
339 ret = -EFAULT;
340 goto out;
341 }
342
Mike Christie0e75f902006-12-01 10:40:55 +0100343 ret = blk_rq_map_user_iov(q, rq, iov, hdr->iovec_count,
344 hdr->dxfer_len);
James Bottomley f1970ba2005-06-20 14:06:52 +0200345 kfree(iov);
346 } else if (hdr->dxfer_len)
347 ret = blk_rq_map_user(q, rq, hdr->dxferp, hdr->dxfer_len);
348
349 if (ret)
350 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351
FUJITA Tomonori77d172c2006-12-11 10:01:34 +0100352 bio = rq->bio;
Jens Axboe3d6392c2007-07-09 12:38:05 +0200353 memset(sense, 0, sizeof(sense));
354 rq->sense = sense;
355 rq->sense_len = 0;
Jens Axboe01840f92006-02-03 08:37:08 +0100356 rq->retries = 0;
357
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358 start_time = jiffies;
359
360 /* ignore return value. All information is passed back to caller
361 * (if he doesn't check that is his problem).
362 * N.B. a non-zero SCSI status is _not_ necessarily an error.
363 */
James Bottomley 994ca9a2005-06-20 14:11:09 +0200364 blk_execute_rq(q, bd_disk, rq, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365
Tejun Heo24bb8fb2007-12-05 21:28:24 +0100366 hdr->duration = jiffies_to_msecs(jiffies - start_time);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367
Jens Axboe3d6392c2007-07-09 12:38:05 +0200368 return blk_complete_sghdr_rq(rq, hdr, bio);
Jens Axboedd1cab92005-06-20 14:06:01 +0200369out:
370 blk_put_request(rq);
371 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372}
373
Christoph Hellwig21b2f0c2006-03-22 17:52:04 +0100374/**
375 * sg_scsi_ioctl -- handle deprecated SCSI_IOCTL_SEND_COMMAND ioctl
376 * @file: file this ioctl operates on (optional)
377 * @q: request queue to send scsi commands down
378 * @disk: gendisk to operate on (option)
379 * @sic: userspace structure describing the command to perform
380 *
381 * Send down the scsi command described by @sic to the device below
382 * the request queue @q. If @file is non-NULL it's used to perform
383 * fine-grained permission checks that allow users to send down
384 * non-destructive SCSI commands. If the caller has a struct gendisk
385 * available it should be passed in as @disk to allow the low level
386 * driver to use the information contained in it. A non-NULL @disk
387 * is only allowed if the caller knows that the low level driver doesn't
388 * need it (e.g. in the scsi subsystem).
389 *
390 * Notes:
391 * - This interface is deprecated - users should use the SG_IO
392 * interface instead, as this is a more flexible approach to
393 * performing SCSI commands on a device.
394 * - The SCSI command length is determined by examining the 1st byte
395 * of the given command. There is no way to override this.
396 * - Data transfers are limited to PAGE_SIZE
397 * - The length (x + y) must be at least OMAX_SB_LEN bytes long to
398 * accommodate the sense buffer when an error occurs.
399 * The sense buffer is truncated to OMAX_SB_LEN (16) bytes so that
400 * old code will not be surprised.
401 * - If a Unix error occurs (e.g. ENOMEM) then the user will receive
402 * a negative return and the Unix error code in 'errno'.
403 * If the SCSI command succeeds then 0 is returned.
404 * Positive numbers returned are the compacted SCSI error codes (4
405 * bytes in one int) where the lowest byte is the SCSI status.
406 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407#define OMAX_SB_LEN 16 /* For backward compatibility */
Christoph Hellwig21b2f0c2006-03-22 17:52:04 +0100408int sg_scsi_ioctl(struct file *file, struct request_queue *q,
409 struct gendisk *disk, struct scsi_ioctl_command __user *sic)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410{
411 struct request *rq;
412 int err;
413 unsigned int in_len, out_len, bytes, opcode, cmdlen;
414 char *buffer = NULL, sense[SCSI_SENSE_BUFFERSIZE];
415
Christoph Hellwig21b2f0c2006-03-22 17:52:04 +0100416 if (!sic)
417 return -EINVAL;
418
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419 /*
420 * get in an out lengths, verify they don't exceed a page worth of data
421 */
422 if (get_user(in_len, &sic->inlen))
423 return -EFAULT;
424 if (get_user(out_len, &sic->outlen))
425 return -EFAULT;
426 if (in_len > PAGE_SIZE || out_len > PAGE_SIZE)
427 return -EINVAL;
428 if (get_user(opcode, sic->data))
429 return -EFAULT;
430
431 bytes = max(in_len, out_len);
432 if (bytes) {
Yoann Padioleaudd00cc42007-07-19 01:49:03 -0700433 buffer = kzalloc(bytes, q->bounce_gfp | GFP_USER| __GFP_NOWARN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434 if (!buffer)
435 return -ENOMEM;
436
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 }
438
439 rq = blk_get_request(q, in_len ? WRITE : READ, __GFP_WAIT);
440
441 cmdlen = COMMAND_SIZE(opcode);
442
443 /*
444 * get command and data to send to device, if any
445 */
446 err = -EFAULT;
447 rq->cmd_len = cmdlen;
448 if (copy_from_user(rq->cmd, sic->data, cmdlen))
449 goto error;
450
Christoph Hellwig21b2f0c2006-03-22 17:52:04 +0100451 if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452 goto error;
453
FUJITA Tomonori337ad412006-12-20 11:18:54 +0100454 err = blk_verify_command(rq->cmd, file->f_mode & FMODE_WRITE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455 if (err)
456 goto error;
457
Christoph Hellwig21b2f0c2006-03-22 17:52:04 +0100458 /* default. possible overriden later */
459 rq->retries = 5;
460
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461 switch (opcode) {
Christoph Hellwig21b2f0c2006-03-22 17:52:04 +0100462 case SEND_DIAGNOSTIC:
463 case FORMAT_UNIT:
464 rq->timeout = FORMAT_UNIT_TIMEOUT;
465 rq->retries = 1;
466 break;
467 case START_STOP:
468 rq->timeout = START_STOP_TIMEOUT;
469 break;
470 case MOVE_MEDIUM:
471 rq->timeout = MOVE_MEDIUM_TIMEOUT;
472 break;
473 case READ_ELEMENT_STATUS:
474 rq->timeout = READ_ELEMENT_STATUS_TIMEOUT;
475 break;
476 case READ_DEFECT_DATA:
477 rq->timeout = READ_DEFECT_DATA_TIMEOUT;
478 rq->retries = 1;
479 break;
480 default:
Jens Axboe3d6392c2007-07-09 12:38:05 +0200481 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
Christoph Hellwig21b2f0c2006-03-22 17:52:04 +0100482 break;
483 }
484
485 if (bytes && blk_rq_map_kern(q, rq, buffer, bytes, __GFP_WAIT)) {
486 err = DRIVER_ERROR << 24;
487 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488 }
489
490 memset(sense, 0, sizeof(sense));
491 rq->sense = sense;
492 rq->sense_len = 0;
Jens Axboe4aff5e22006-08-10 08:44:47 +0200493 rq->cmd_type = REQ_TYPE_BLOCK_PC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494
Christoph Hellwig21b2f0c2006-03-22 17:52:04 +0100495 blk_execute_rq(q, disk, rq, 0);
496
497out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498 err = rq->errors & 0xff; /* only 8 bit SCSI status */
499 if (err) {
500 if (rq->sense_len && rq->sense) {
501 bytes = (OMAX_SB_LEN > rq->sense_len) ?
502 rq->sense_len : OMAX_SB_LEN;
503 if (copy_to_user(sic->data, rq->sense, bytes))
504 err = -EFAULT;
505 }
506 } else {
507 if (copy_to_user(sic->data, buffer, out_len))
508 err = -EFAULT;
509 }
510
511error:
512 kfree(buffer);
513 blk_put_request(rq);
514 return err;
515}
Christoph Hellwig21b2f0c2006-03-22 17:52:04 +0100516EXPORT_SYMBOL_GPL(sg_scsi_ioctl);
Ben Collinsf98d2df2005-12-19 11:49:24 -0800517
518/* Send basic block requests */
Jens Axboe165125e2007-07-24 09:28:11 +0200519static int __blk_send_generic(struct request_queue *q, struct gendisk *bd_disk,
520 int cmd, int data)
Ben Collinsf98d2df2005-12-19 11:49:24 -0800521{
522 struct request *rq;
523 int err;
524
525 rq = blk_get_request(q, WRITE, __GFP_WAIT);
Jens Axboe4aff5e22006-08-10 08:44:47 +0200526 rq->cmd_type = REQ_TYPE_BLOCK_PC;
Ben Collinsf98d2df2005-12-19 11:49:24 -0800527 rq->data = NULL;
528 rq->data_len = 0;
FUJITA Tomonori7a85f882008-03-04 11:17:11 +0100529 rq->extra_len = 0;
Jens Axboe3d6392c2007-07-09 12:38:05 +0200530 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
Ben Collinsf98d2df2005-12-19 11:49:24 -0800531 rq->cmd[0] = cmd;
532 rq->cmd[4] = data;
533 rq->cmd_len = 6;
534 err = blk_execute_rq(q, bd_disk, rq, 0);
535 blk_put_request(rq);
536
537 return err;
538}
539
Jens Axboe165125e2007-07-24 09:28:11 +0200540static inline int blk_send_start_stop(struct request_queue *q,
541 struct gendisk *bd_disk, int data)
Ben Collinsf98d2df2005-12-19 11:49:24 -0800542{
543 return __blk_send_generic(q, bd_disk, GPCMD_START_STOP_UNIT, data);
544}
545
FUJITA Tomonori45e79a32007-07-09 12:39:20 +0200546int scsi_cmd_ioctl(struct file *file, struct request_queue *q,
547 struct gendisk *bd_disk, unsigned int cmd, void __user *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548{
Ben Collinsf98d2df2005-12-19 11:49:24 -0800549 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550
FUJITA Tomonori45e79a32007-07-09 12:39:20 +0200551 if (!q || blk_get_queue(q))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552 return -ENXIO;
553
554 switch (cmd) {
555 /*
556 * new sgv3 interface
557 */
558 case SG_GET_VERSION_NUM:
559 err = sg_get_version(arg);
560 break;
561 case SCSI_IOCTL_GET_IDLUN:
562 err = scsi_get_idlun(q, arg);
563 break;
564 case SCSI_IOCTL_GET_BUS_NUMBER:
565 err = scsi_get_bus(q, arg);
566 break;
567 case SG_SET_TIMEOUT:
568 err = sg_set_timeout(q, arg);
569 break;
570 case SG_GET_TIMEOUT:
571 err = sg_get_timeout(q);
572 break;
573 case SG_GET_RESERVED_SIZE:
574 err = sg_get_reserved_size(q, arg);
575 break;
576 case SG_SET_RESERVED_SIZE:
577 err = sg_set_reserved_size(q, arg);
578 break;
579 case SG_EMULATED_HOST:
580 err = sg_emulated_host(q, arg);
581 break;
582 case SG_IO: {
583 struct sg_io_hdr hdr;
584
585 err = -EFAULT;
586 if (copy_from_user(&hdr, arg, sizeof(hdr)))
587 break;
588 err = sg_io(file, q, bd_disk, &hdr);
589 if (err == -EFAULT)
590 break;
591
592 if (copy_to_user(arg, &hdr, sizeof(hdr)))
593 err = -EFAULT;
594 break;
595 }
596 case CDROM_SEND_PACKET: {
597 struct cdrom_generic_command cgc;
598 struct sg_io_hdr hdr;
599
600 err = -EFAULT;
601 if (copy_from_user(&cgc, arg, sizeof(cgc)))
602 break;
603 cgc.timeout = clock_t_to_jiffies(cgc.timeout);
604 memset(&hdr, 0, sizeof(hdr));
605 hdr.interface_id = 'S';
606 hdr.cmd_len = sizeof(cgc.cmd);
607 hdr.dxfer_len = cgc.buflen;
608 err = 0;
609 switch (cgc.data_direction) {
610 case CGC_DATA_UNKNOWN:
611 hdr.dxfer_direction = SG_DXFER_UNKNOWN;
612 break;
613 case CGC_DATA_WRITE:
614 hdr.dxfer_direction = SG_DXFER_TO_DEV;
615 break;
616 case CGC_DATA_READ:
617 hdr.dxfer_direction = SG_DXFER_FROM_DEV;
618 break;
619 case CGC_DATA_NONE:
620 hdr.dxfer_direction = SG_DXFER_NONE;
621 break;
622 default:
623 err = -EINVAL;
624 }
625 if (err)
626 break;
627
628 hdr.dxferp = cgc.buffer;
629 hdr.sbp = cgc.sense;
630 if (hdr.sbp)
631 hdr.mx_sb_len = sizeof(struct request_sense);
632 hdr.timeout = cgc.timeout;
633 hdr.cmdp = ((struct cdrom_generic_command __user*) arg)->cmd;
634 hdr.cmd_len = sizeof(cgc.cmd);
635
636 err = sg_io(file, q, bd_disk, &hdr);
637 if (err == -EFAULT)
638 break;
639
640 if (hdr.status)
641 err = -EIO;
642
643 cgc.stat = err;
644 cgc.buflen = hdr.resid;
645 if (copy_to_user(arg, &cgc, sizeof(cgc)))
646 err = -EFAULT;
647
648 break;
649 }
650
651 /*
652 * old junk scsi send command ioctl
653 */
654 case SCSI_IOCTL_SEND_COMMAND:
655 printk(KERN_WARNING "program %s is using a deprecated SCSI ioctl, please convert it to SG_IO\n", current->comm);
656 err = -EINVAL;
657 if (!arg)
658 break;
659
660 err = sg_scsi_ioctl(file, q, bd_disk, arg);
661 break;
662 case CDROMCLOSETRAY:
Ben Collinsf98d2df2005-12-19 11:49:24 -0800663 err = blk_send_start_stop(q, bd_disk, 0x03);
664 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665 case CDROMEJECT:
Ben Collinsf98d2df2005-12-19 11:49:24 -0800666 err = blk_send_start_stop(q, bd_disk, 0x02);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667 break;
668 default:
669 err = -ENOTTY;
670 }
671
672 blk_put_queue(q);
673 return err;
674}
675
676EXPORT_SYMBOL(scsi_cmd_ioctl);