blob: a5ffcc988f0b00441a29f76e63e874892d121350 [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>
Paolo Bonzini0bfc96c2012-01-12 16:01:28 +010027#include <linux/ratelimit.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070028#include <linux/slab.h>
29#include <linux/times.h>
Kent Overstreeta27bb332013-05-07 16:19:08 -070030#include <linux/uio.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#include <asm/uaccess.h>
32
33#include <scsi/scsi.h>
34#include <scsi/scsi_ioctl.h>
35#include <scsi/scsi_cmnd.h>
36
Jens Axboe018e0442009-06-26 16:27:10 +020037struct blk_cmd_filter {
38 unsigned long read_ok[BLK_SCSI_CMD_PER_LONG];
39 unsigned long write_ok[BLK_SCSI_CMD_PER_LONG];
H Hartley Sweeten476d42f2009-11-04 09:10:33 +010040};
41
42static struct blk_cmd_filter blk_default_cmd_filter;
Jens Axboe018e0442009-06-26 16:27:10 +020043
Linus Torvalds1da177e2005-04-16 15:20:36 -070044/* Command group 3 is reserved and should never be used. */
Boaz Harroshdb4742d2008-04-30 11:27:26 +030045const unsigned char scsi_command_size_tbl[8] =
Linus Torvalds1da177e2005-04-16 15:20:36 -070046{
47 6, 10, 10, 12,
48 16, 12, 10, 10
49};
Boaz Harroshdb4742d2008-04-30 11:27:26 +030050EXPORT_SYMBOL(scsi_command_size_tbl);
Linus Torvalds1da177e2005-04-16 15:20:36 -070051
Linus Torvalds1da177e2005-04-16 15:20:36 -070052#include <scsi/sg.h>
53
54static int sg_get_version(int __user *p)
55{
Arjan van de Ven64100092006-01-06 09:46:02 +010056 static const int sg_version_num = 30527;
Linus Torvalds1da177e2005-04-16 15:20:36 -070057 return put_user(sg_version_num, p);
58}
59
Jens Axboe165125e2007-07-24 09:28:11 +020060static int scsi_get_idlun(struct request_queue *q, int __user *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -070061{
62 return put_user(0, p);
63}
64
Jens Axboe165125e2007-07-24 09:28:11 +020065static int scsi_get_bus(struct request_queue *q, int __user *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -070066{
67 return put_user(0, p);
68}
69
Jens Axboe165125e2007-07-24 09:28:11 +020070static int sg_get_timeout(struct request_queue *q)
Linus Torvalds1da177e2005-04-16 15:20:36 -070071{
Milton Miller2b91baf2008-11-17 13:10:34 +010072 return jiffies_to_clock_t(q->sg_timeout);
Linus Torvalds1da177e2005-04-16 15:20:36 -070073}
74
Jens Axboe165125e2007-07-24 09:28:11 +020075static int sg_set_timeout(struct request_queue *q, int __user *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -070076{
77 int timeout, err = get_user(timeout, p);
78
79 if (!err)
Milton Miller2b91baf2008-11-17 13:10:34 +010080 q->sg_timeout = clock_t_to_jiffies(timeout);
Linus Torvalds1da177e2005-04-16 15:20:36 -070081
82 return err;
83}
84
Jens Axboe165125e2007-07-24 09:28:11 +020085static int sg_get_reserved_size(struct request_queue *q, int __user *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -070086{
Martin K. Petersenae03bf62009-05-22 17:17:50 -040087 unsigned val = min(q->sg_reserved_size, queue_max_sectors(q) << 9);
Alan Stern44ec9542007-02-20 11:01:57 -050088
89 return put_user(val, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -070090}
91
Jens Axboe165125e2007-07-24 09:28:11 +020092static int sg_set_reserved_size(struct request_queue *q, int __user *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -070093{
94 int size, err = get_user(size, p);
95
96 if (err)
97 return err;
98
99 if (size < 0)
100 return -EINVAL;
Martin K. Petersenae03bf62009-05-22 17:17:50 -0400101 if (size > (queue_max_sectors(q) << 9))
102 size = queue_max_sectors(q) << 9;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103
104 q->sg_reserved_size = size;
105 return 0;
106}
107
108/*
109 * will always return that we are ATAPI even for a real SCSI drive, I'm not
110 * so sure this is worth doing anything about (why would you care??)
111 */
Jens Axboe165125e2007-07-24 09:28:11 +0200112static int sg_emulated_host(struct request_queue *q, int __user *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113{
114 return put_user(1, p);
115}
116
Jens Axboe018e0442009-06-26 16:27:10 +0200117static void blk_set_cmd_filter_defaults(struct blk_cmd_filter *filter)
FUJITA Tomonoriabf54392008-08-16 14:10:05 +0900118{
119 /* Basic read-only commands */
120 __set_bit(TEST_UNIT_READY, filter->read_ok);
121 __set_bit(REQUEST_SENSE, filter->read_ok);
122 __set_bit(READ_6, filter->read_ok);
123 __set_bit(READ_10, filter->read_ok);
124 __set_bit(READ_12, filter->read_ok);
125 __set_bit(READ_16, filter->read_ok);
126 __set_bit(READ_BUFFER, filter->read_ok);
127 __set_bit(READ_DEFECT_DATA, filter->read_ok);
128 __set_bit(READ_CAPACITY, filter->read_ok);
129 __set_bit(READ_LONG, filter->read_ok);
130 __set_bit(INQUIRY, filter->read_ok);
131 __set_bit(MODE_SENSE, filter->read_ok);
132 __set_bit(MODE_SENSE_10, filter->read_ok);
133 __set_bit(LOG_SENSE, filter->read_ok);
134 __set_bit(START_STOP, filter->read_ok);
135 __set_bit(GPCMD_VERIFY_10, filter->read_ok);
136 __set_bit(VERIFY_16, filter->read_ok);
137 __set_bit(REPORT_LUNS, filter->read_ok);
138 __set_bit(SERVICE_ACTION_IN, filter->read_ok);
139 __set_bit(RECEIVE_DIAGNOSTIC, filter->read_ok);
140 __set_bit(MAINTENANCE_IN, filter->read_ok);
141 __set_bit(GPCMD_READ_BUFFER_CAPACITY, filter->read_ok);
142
143 /* Audio CD commands */
144 __set_bit(GPCMD_PLAY_CD, filter->read_ok);
145 __set_bit(GPCMD_PLAY_AUDIO_10, filter->read_ok);
146 __set_bit(GPCMD_PLAY_AUDIO_MSF, filter->read_ok);
147 __set_bit(GPCMD_PLAY_AUDIO_TI, filter->read_ok);
148 __set_bit(GPCMD_PAUSE_RESUME, filter->read_ok);
149
150 /* CD/DVD data reading */
151 __set_bit(GPCMD_READ_CD, filter->read_ok);
152 __set_bit(GPCMD_READ_CD_MSF, filter->read_ok);
153 __set_bit(GPCMD_READ_DISC_INFO, filter->read_ok);
154 __set_bit(GPCMD_READ_CDVD_CAPACITY, filter->read_ok);
155 __set_bit(GPCMD_READ_DVD_STRUCTURE, filter->read_ok);
156 __set_bit(GPCMD_READ_HEADER, filter->read_ok);
157 __set_bit(GPCMD_READ_TRACK_RZONE_INFO, filter->read_ok);
158 __set_bit(GPCMD_READ_SUBCHANNEL, filter->read_ok);
159 __set_bit(GPCMD_READ_TOC_PMA_ATIP, filter->read_ok);
160 __set_bit(GPCMD_REPORT_KEY, filter->read_ok);
161 __set_bit(GPCMD_SCAN, filter->read_ok);
162 __set_bit(GPCMD_GET_CONFIGURATION, filter->read_ok);
163 __set_bit(GPCMD_READ_FORMAT_CAPACITIES, filter->read_ok);
164 __set_bit(GPCMD_GET_EVENT_STATUS_NOTIFICATION, filter->read_ok);
165 __set_bit(GPCMD_GET_PERFORMANCE, filter->read_ok);
166 __set_bit(GPCMD_SEEK, filter->read_ok);
167 __set_bit(GPCMD_STOP_PLAY_SCAN, filter->read_ok);
168
169 /* Basic writing commands */
170 __set_bit(WRITE_6, filter->write_ok);
171 __set_bit(WRITE_10, filter->write_ok);
172 __set_bit(WRITE_VERIFY, filter->write_ok);
173 __set_bit(WRITE_12, filter->write_ok);
174 __set_bit(WRITE_VERIFY_12, filter->write_ok);
175 __set_bit(WRITE_16, filter->write_ok);
176 __set_bit(WRITE_LONG, filter->write_ok);
177 __set_bit(WRITE_LONG_2, filter->write_ok);
178 __set_bit(ERASE, filter->write_ok);
179 __set_bit(GPCMD_MODE_SELECT_10, filter->write_ok);
180 __set_bit(MODE_SELECT, filter->write_ok);
181 __set_bit(LOG_SELECT, filter->write_ok);
182 __set_bit(GPCMD_BLANK, filter->write_ok);
183 __set_bit(GPCMD_CLOSE_TRACK, filter->write_ok);
184 __set_bit(GPCMD_FLUSH_CACHE, filter->write_ok);
185 __set_bit(GPCMD_FORMAT_UNIT, filter->write_ok);
186 __set_bit(GPCMD_REPAIR_RZONE_TRACK, filter->write_ok);
187 __set_bit(GPCMD_RESERVE_RZONE_TRACK, filter->write_ok);
188 __set_bit(GPCMD_SEND_DVD_STRUCTURE, filter->write_ok);
189 __set_bit(GPCMD_SEND_EVENT, filter->write_ok);
190 __set_bit(GPCMD_SEND_KEY, filter->write_ok);
191 __set_bit(GPCMD_SEND_OPC, filter->write_ok);
192 __set_bit(GPCMD_SEND_CUE_SHEET, filter->write_ok);
193 __set_bit(GPCMD_SET_SPEED, filter->write_ok);
194 __set_bit(GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL, filter->write_ok);
195 __set_bit(GPCMD_LOAD_UNLOAD, filter->write_ok);
196 __set_bit(GPCMD_SET_STREAMING, filter->write_ok);
xiphmont@xiph.org35e396c2008-08-22 11:12:21 +0200197 __set_bit(GPCMD_SET_READ_AHEAD, filter->write_ok);
FUJITA Tomonoriabf54392008-08-16 14:10:05 +0900198}
Jens Axboe018e0442009-06-26 16:27:10 +0200199
200int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm)
201{
202 struct blk_cmd_filter *filter = &blk_default_cmd_filter;
203
204 /* root can do any command. */
205 if (capable(CAP_SYS_RAWIO))
206 return 0;
207
208 /* if there's no filter set, assume we're filtering everything out */
209 if (!filter)
210 return -EPERM;
211
212 /* Anybody who can open the device can do a read-safe command */
213 if (test_bit(cmd[0], filter->read_ok))
214 return 0;
215
216 /* Write-safe commands require a writable open */
217 if (test_bit(cmd[0], filter->write_ok) && has_write_perm)
218 return 0;
219
220 return -EPERM;
221}
222EXPORT_SYMBOL(blk_verify_command);
FUJITA Tomonoriabf54392008-08-16 14:10:05 +0900223
Jens Axboe165125e2007-07-24 09:28:11 +0200224static int blk_fill_sghdr_rq(struct request_queue *q, struct request *rq,
Al Viro5842e512008-09-02 16:35:55 -0400225 struct sg_io_hdr *hdr, fmode_t mode)
Jens Axboe3d6392c2007-07-09 12:38:05 +0200226{
Jens Axboe3d6392c2007-07-09 12:38:05 +0200227 if (copy_from_user(rq->cmd, hdr->cmdp, hdr->cmd_len))
228 return -EFAULT;
Jens Axboe018e0442009-06-26 16:27:10 +0200229 if (blk_verify_command(rq->cmd, mode & FMODE_WRITE))
Jens Axboe3d6392c2007-07-09 12:38:05 +0200230 return -EPERM;
231
232 /*
233 * fill in request structure
234 */
235 rq->cmd_len = hdr->cmd_len;
236 rq->cmd_type = REQ_TYPE_BLOCK_PC;
237
Tejun Heo24bb8fb2007-12-05 21:28:24 +0100238 rq->timeout = msecs_to_jiffies(hdr->timeout);
Jens Axboe3d6392c2007-07-09 12:38:05 +0200239 if (!rq->timeout)
240 rq->timeout = q->sg_timeout;
241 if (!rq->timeout)
242 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
Linus Torvaldsf2f1fa72008-12-05 14:49:18 -0800243 if (rq->timeout < BLK_MIN_SG_TIMEOUT)
244 rq->timeout = BLK_MIN_SG_TIMEOUT;
Jens Axboe3d6392c2007-07-09 12:38:05 +0200245
246 return 0;
247}
Jens Axboe3d6392c2007-07-09 12:38:05 +0200248
FUJITA Tomonori41e17032007-07-22 10:06:50 +0900249static int blk_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr,
250 struct bio *bio)
Jens Axboe3d6392c2007-07-09 12:38:05 +0200251{
FUJITA Tomonori91e463c2009-04-13 20:03:10 +0200252 int r, ret = 0;
Jens Axboe3d6392c2007-07-09 12:38:05 +0200253
254 /*
255 * fill in all the output members
256 */
257 hdr->status = rq->errors & 0xff;
258 hdr->masked_status = status_byte(rq->errors);
259 hdr->msg_status = msg_byte(rq->errors);
260 hdr->host_status = host_byte(rq->errors);
261 hdr->driver_status = driver_byte(rq->errors);
262 hdr->info = 0;
263 if (hdr->masked_status || hdr->host_status || hdr->driver_status)
264 hdr->info |= SG_INFO_CHECK;
Tejun Heoc3a4d782009-05-07 22:24:37 +0900265 hdr->resid = rq->resid_len;
Jens Axboe3d6392c2007-07-09 12:38:05 +0200266 hdr->sb_len_wr = 0;
267
268 if (rq->sense_len && hdr->sbp) {
269 int len = min((unsigned int) hdr->mx_sb_len, rq->sense_len);
270
271 if (!copy_to_user(hdr->sbp, rq->sense, len))
272 hdr->sb_len_wr = len;
273 else
274 ret = -EFAULT;
275 }
276
FUJITA Tomonori91e463c2009-04-13 20:03:10 +0200277 r = blk_rq_unmap_user(bio);
278 if (!ret)
279 ret = r;
Boaz Harrosh1cd96c22009-03-24 12:35:07 +0100280 blk_put_request(rq);
Jens Axboe3d6392c2007-07-09 12:38:05 +0200281
Boaz Harrosh1cd96c22009-03-24 12:35:07 +0100282 return ret;
Jens Axboe3d6392c2007-07-09 12:38:05 +0200283}
Jens Axboe3d6392c2007-07-09 12:38:05 +0200284
Al Viro5842e512008-09-02 16:35:55 -0400285static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
286 struct sg_io_hdr *hdr, fmode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287{
Jens Axboe3d6392c2007-07-09 12:38:05 +0200288 unsigned long start_time;
Adel Gadllah0b07de82008-06-26 13:48:27 +0200289 int writing = 0, ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290 struct request *rq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 char sense[SCSI_SENSE_BUFFERSIZE];
FUJITA Tomonori77d172c2006-12-11 10:01:34 +0100292 struct bio *bio;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293
294 if (hdr->interface_id != 'S')
295 return -EINVAL;
296 if (hdr->cmd_len > BLK_MAX_CDB)
297 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298
Martin K. Petersenae03bf62009-05-22 17:17:50 -0400299 if (hdr->dxfer_len > (queue_max_hw_sectors(q) << 9))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 return -EIO;
301
James Bottomley f1970ba2005-06-20 14:06:52 +0200302 if (hdr->dxfer_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303 switch (hdr->dxfer_direction) {
304 default:
305 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306 case SG_DXFER_TO_DEV:
307 writing = 1;
308 break;
Jens Axboe616e8a02006-11-13 18:04:59 +0100309 case SG_DXFER_TO_FROM_DEV:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 case SG_DXFER_FROM_DEV:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 break;
312 }
313
Jens Axboedd1cab92005-06-20 14:06:01 +0200314 rq = blk_get_request(q, writing ? WRITE : READ, GFP_KERNEL);
315 if (!rq)
316 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317
Al Viro5842e512008-09-02 16:35:55 -0400318 if (blk_fill_sghdr_rq(q, rq, hdr, mode)) {
Jens Axboe3d6392c2007-07-09 12:38:05 +0200319 blk_put_request(rq);
320 return -EFAULT;
321 }
Mike Christie0e75f902006-12-01 10:40:55 +0100322
James Bottomley f1970ba2005-06-20 14:06:52 +0200323 if (hdr->iovec_count) {
324 const int size = sizeof(struct sg_iovec) * hdr->iovec_count;
Tejun Heo25636e22009-04-15 22:10:24 +0900325 size_t iov_data_len;
Jens Axboe9f864c82010-10-29 11:31:42 -0600326 struct sg_iovec *sg_iov;
327 struct iovec *iov;
328 int i;
James Bottomley f1970ba2005-06-20 14:06:52 +0200329
Jens Axboe9f864c82010-10-29 11:31:42 -0600330 sg_iov = kmalloc(size, GFP_KERNEL);
331 if (!sg_iov) {
James Bottomley f1970ba2005-06-20 14:06:52 +0200332 ret = -ENOMEM;
Jens Axboedd1cab92005-06-20 14:06:01 +0200333 goto out;
James Bottomley f1970ba2005-06-20 14:06:52 +0200334 }
335
Jens Axboe9f864c82010-10-29 11:31:42 -0600336 if (copy_from_user(sg_iov, hdr->dxferp, size)) {
337 kfree(sg_iov);
James Bottomley f1970ba2005-06-20 14:06:52 +0200338 ret = -EFAULT;
339 goto out;
340 }
341
Jens Axboe9f864c82010-10-29 11:31:42 -0600342 /*
343 * Sum up the vecs, making sure they don't overflow
344 */
345 iov = (struct iovec *) sg_iov;
346 iov_data_len = 0;
347 for (i = 0; i < hdr->iovec_count; i++) {
348 if (iov_data_len + iov[i].iov_len < iov_data_len) {
349 kfree(sg_iov);
350 ret = -EINVAL;
351 goto out;
352 }
353 iov_data_len += iov[i].iov_len;
354 }
355
Tejun Heo25636e22009-04-15 22:10:24 +0900356 /* SG_IO howto says that the shorter of the two wins */
Tejun Heo25636e22009-04-15 22:10:24 +0900357 if (hdr->dxfer_len < iov_data_len) {
Jens Axboe9f864c82010-10-29 11:31:42 -0600358 hdr->iovec_count = iov_shorten(iov,
Tejun Heo25636e22009-04-15 22:10:24 +0900359 hdr->iovec_count,
360 hdr->dxfer_len);
361 iov_data_len = hdr->dxfer_len;
362 }
363
Jens Axboe9f864c82010-10-29 11:31:42 -0600364 ret = blk_rq_map_user_iov(q, rq, NULL, sg_iov, hdr->iovec_count,
Tejun Heo25636e22009-04-15 22:10:24 +0900365 iov_data_len, GFP_KERNEL);
Jens Axboe9f864c82010-10-29 11:31:42 -0600366 kfree(sg_iov);
James Bottomley f1970ba2005-06-20 14:06:52 +0200367 } else if (hdr->dxfer_len)
FUJITA Tomonori152e2832008-08-28 16:17:06 +0900368 ret = blk_rq_map_user(q, rq, NULL, hdr->dxferp, hdr->dxfer_len,
FUJITA Tomonoria3bce902008-08-28 16:17:05 +0900369 GFP_KERNEL);
James Bottomley f1970ba2005-06-20 14:06:52 +0200370
371 if (ret)
372 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373
FUJITA Tomonori77d172c2006-12-11 10:01:34 +0100374 bio = rq->bio;
Jens Axboe3d6392c2007-07-09 12:38:05 +0200375 memset(sense, 0, sizeof(sense));
376 rq->sense = sense;
377 rq->sense_len = 0;
Jens Axboe01840f92006-02-03 08:37:08 +0100378 rq->retries = 0;
379
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380 start_time = jiffies;
381
382 /* ignore return value. All information is passed back to caller
383 * (if he doesn't check that is his problem).
384 * N.B. a non-zero SCSI status is _not_ necessarily an error.
385 */
James Bottomley 994ca9a2005-06-20 14:11:09 +0200386 blk_execute_rq(q, bd_disk, rq, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387
Tejun Heo24bb8fb2007-12-05 21:28:24 +0100388 hdr->duration = jiffies_to_msecs(jiffies - start_time);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389
Jens Axboe3d6392c2007-07-09 12:38:05 +0200390 return blk_complete_sghdr_rq(rq, hdr, bio);
Jens Axboedd1cab92005-06-20 14:06:01 +0200391out:
392 blk_put_request(rq);
393 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394}
395
Christoph Hellwig21b2f0c2006-03-22 17:52:04 +0100396/**
397 * sg_scsi_ioctl -- handle deprecated SCSI_IOCTL_SEND_COMMAND ioctl
398 * @file: file this ioctl operates on (optional)
399 * @q: request queue to send scsi commands down
400 * @disk: gendisk to operate on (option)
401 * @sic: userspace structure describing the command to perform
402 *
403 * Send down the scsi command described by @sic to the device below
404 * the request queue @q. If @file is non-NULL it's used to perform
405 * fine-grained permission checks that allow users to send down
406 * non-destructive SCSI commands. If the caller has a struct gendisk
407 * available it should be passed in as @disk to allow the low level
408 * driver to use the information contained in it. A non-NULL @disk
409 * is only allowed if the caller knows that the low level driver doesn't
410 * need it (e.g. in the scsi subsystem).
411 *
412 * Notes:
413 * - This interface is deprecated - users should use the SG_IO
414 * interface instead, as this is a more flexible approach to
415 * performing SCSI commands on a device.
416 * - The SCSI command length is determined by examining the 1st byte
417 * of the given command. There is no way to override this.
418 * - Data transfers are limited to PAGE_SIZE
419 * - The length (x + y) must be at least OMAX_SB_LEN bytes long to
420 * accommodate the sense buffer when an error occurs.
421 * The sense buffer is truncated to OMAX_SB_LEN (16) bytes so that
422 * old code will not be surprised.
423 * - If a Unix error occurs (e.g. ENOMEM) then the user will receive
424 * a negative return and the Unix error code in 'errno'.
425 * If the SCSI command succeeds then 0 is returned.
426 * Positive numbers returned are the compacted SCSI error codes (4
427 * bytes in one int) where the lowest byte is the SCSI status.
428 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429#define OMAX_SB_LEN 16 /* For backward compatibility */
Al Viroe915e872008-09-02 17:16:41 -0400430int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode,
431 struct scsi_ioctl_command __user *sic)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432{
433 struct request *rq;
Al Viroaeb5d722008-09-02 15:28:45 -0400434 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435 unsigned int in_len, out_len, bytes, opcode, cmdlen;
436 char *buffer = NULL, sense[SCSI_SENSE_BUFFERSIZE];
437
Christoph Hellwig21b2f0c2006-03-22 17:52:04 +0100438 if (!sic)
439 return -EINVAL;
440
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 /*
442 * get in an out lengths, verify they don't exceed a page worth of data
443 */
444 if (get_user(in_len, &sic->inlen))
445 return -EFAULT;
446 if (get_user(out_len, &sic->outlen))
447 return -EFAULT;
448 if (in_len > PAGE_SIZE || out_len > PAGE_SIZE)
449 return -EINVAL;
450 if (get_user(opcode, sic->data))
451 return -EFAULT;
452
453 bytes = max(in_len, out_len);
454 if (bytes) {
Yoann Padioleaudd00cc42007-07-19 01:49:03 -0700455 buffer = kzalloc(bytes, q->bounce_gfp | GFP_USER| __GFP_NOWARN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 if (!buffer)
457 return -ENOMEM;
458
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 }
460
461 rq = blk_get_request(q, in_len ? WRITE : READ, __GFP_WAIT);
462
463 cmdlen = COMMAND_SIZE(opcode);
464
465 /*
466 * get command and data to send to device, if any
467 */
468 err = -EFAULT;
469 rq->cmd_len = cmdlen;
470 if (copy_from_user(rq->cmd, sic->data, cmdlen))
471 goto error;
472
Christoph Hellwig21b2f0c2006-03-22 17:52:04 +0100473 if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474 goto error;
475
Jens Axboe018e0442009-06-26 16:27:10 +0200476 err = blk_verify_command(rq->cmd, mode & FMODE_WRITE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 if (err)
478 goto error;
479
Christoph Hellwig21b2f0c2006-03-22 17:52:04 +0100480 /* default. possible overriden later */
481 rq->retries = 5;
482
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483 switch (opcode) {
Christoph Hellwig21b2f0c2006-03-22 17:52:04 +0100484 case SEND_DIAGNOSTIC:
485 case FORMAT_UNIT:
486 rq->timeout = FORMAT_UNIT_TIMEOUT;
487 rq->retries = 1;
488 break;
489 case START_STOP:
490 rq->timeout = START_STOP_TIMEOUT;
491 break;
492 case MOVE_MEDIUM:
493 rq->timeout = MOVE_MEDIUM_TIMEOUT;
494 break;
495 case READ_ELEMENT_STATUS:
496 rq->timeout = READ_ELEMENT_STATUS_TIMEOUT;
497 break;
498 case READ_DEFECT_DATA:
499 rq->timeout = READ_DEFECT_DATA_TIMEOUT;
500 rq->retries = 1;
501 break;
502 default:
Jens Axboe3d6392c2007-07-09 12:38:05 +0200503 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
Christoph Hellwig21b2f0c2006-03-22 17:52:04 +0100504 break;
505 }
506
507 if (bytes && blk_rq_map_kern(q, rq, buffer, bytes, __GFP_WAIT)) {
508 err = DRIVER_ERROR << 24;
509 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510 }
511
512 memset(sense, 0, sizeof(sense));
513 rq->sense = sense;
514 rq->sense_len = 0;
Jens Axboe4aff5e22006-08-10 08:44:47 +0200515 rq->cmd_type = REQ_TYPE_BLOCK_PC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516
Christoph Hellwig21b2f0c2006-03-22 17:52:04 +0100517 blk_execute_rq(q, disk, rq, 0);
518
519out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520 err = rq->errors & 0xff; /* only 8 bit SCSI status */
521 if (err) {
522 if (rq->sense_len && rq->sense) {
523 bytes = (OMAX_SB_LEN > rq->sense_len) ?
524 rq->sense_len : OMAX_SB_LEN;
525 if (copy_to_user(sic->data, rq->sense, bytes))
526 err = -EFAULT;
527 }
528 } else {
529 if (copy_to_user(sic->data, buffer, out_len))
530 err = -EFAULT;
531 }
532
533error:
534 kfree(buffer);
535 blk_put_request(rq);
536 return err;
537}
Christoph Hellwig21b2f0c2006-03-22 17:52:04 +0100538EXPORT_SYMBOL_GPL(sg_scsi_ioctl);
Ben Collinsf98d2df2005-12-19 11:49:24 -0800539
540/* Send basic block requests */
Jens Axboe165125e2007-07-24 09:28:11 +0200541static int __blk_send_generic(struct request_queue *q, struct gendisk *bd_disk,
542 int cmd, int data)
Ben Collinsf98d2df2005-12-19 11:49:24 -0800543{
544 struct request *rq;
545 int err;
546
547 rq = blk_get_request(q, WRITE, __GFP_WAIT);
Jens Axboe4aff5e22006-08-10 08:44:47 +0200548 rq->cmd_type = REQ_TYPE_BLOCK_PC;
Jens Axboe3d6392c2007-07-09 12:38:05 +0200549 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
Ben Collinsf98d2df2005-12-19 11:49:24 -0800550 rq->cmd[0] = cmd;
551 rq->cmd[4] = data;
552 rq->cmd_len = 6;
553 err = blk_execute_rq(q, bd_disk, rq, 0);
554 blk_put_request(rq);
555
556 return err;
557}
558
Jens Axboe165125e2007-07-24 09:28:11 +0200559static inline int blk_send_start_stop(struct request_queue *q,
560 struct gendisk *bd_disk, int data)
Ben Collinsf98d2df2005-12-19 11:49:24 -0800561{
562 return __blk_send_generic(q, bd_disk, GPCMD_START_STOP_UNIT, data);
563}
564
Al Viro74f3c8a2007-08-27 15:38:10 -0400565int scsi_cmd_ioctl(struct request_queue *q, struct gendisk *bd_disk, fmode_t mode,
566 unsigned int cmd, void __user *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567{
Ben Collinsf98d2df2005-12-19 11:49:24 -0800568 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569
Tejun Heo315fcee2011-10-19 14:31:25 +0200570 if (!q)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571 return -ENXIO;
572
573 switch (cmd) {
574 /*
575 * new sgv3 interface
576 */
577 case SG_GET_VERSION_NUM:
578 err = sg_get_version(arg);
579 break;
580 case SCSI_IOCTL_GET_IDLUN:
581 err = scsi_get_idlun(q, arg);
582 break;
583 case SCSI_IOCTL_GET_BUS_NUMBER:
584 err = scsi_get_bus(q, arg);
585 break;
586 case SG_SET_TIMEOUT:
587 err = sg_set_timeout(q, arg);
588 break;
589 case SG_GET_TIMEOUT:
590 err = sg_get_timeout(q);
591 break;
592 case SG_GET_RESERVED_SIZE:
593 err = sg_get_reserved_size(q, arg);
594 break;
595 case SG_SET_RESERVED_SIZE:
596 err = sg_set_reserved_size(q, arg);
597 break;
598 case SG_EMULATED_HOST:
599 err = sg_emulated_host(q, arg);
600 break;
601 case SG_IO: {
602 struct sg_io_hdr hdr;
603
604 err = -EFAULT;
605 if (copy_from_user(&hdr, arg, sizeof(hdr)))
606 break;
Al Viro74f3c8a2007-08-27 15:38:10 -0400607 err = sg_io(q, bd_disk, &hdr, mode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608 if (err == -EFAULT)
609 break;
610
611 if (copy_to_user(arg, &hdr, sizeof(hdr)))
612 err = -EFAULT;
613 break;
614 }
615 case CDROM_SEND_PACKET: {
616 struct cdrom_generic_command cgc;
617 struct sg_io_hdr hdr;
618
619 err = -EFAULT;
620 if (copy_from_user(&cgc, arg, sizeof(cgc)))
621 break;
622 cgc.timeout = clock_t_to_jiffies(cgc.timeout);
623 memset(&hdr, 0, sizeof(hdr));
624 hdr.interface_id = 'S';
625 hdr.cmd_len = sizeof(cgc.cmd);
626 hdr.dxfer_len = cgc.buflen;
627 err = 0;
628 switch (cgc.data_direction) {
629 case CGC_DATA_UNKNOWN:
630 hdr.dxfer_direction = SG_DXFER_UNKNOWN;
631 break;
632 case CGC_DATA_WRITE:
633 hdr.dxfer_direction = SG_DXFER_TO_DEV;
634 break;
635 case CGC_DATA_READ:
636 hdr.dxfer_direction = SG_DXFER_FROM_DEV;
637 break;
638 case CGC_DATA_NONE:
639 hdr.dxfer_direction = SG_DXFER_NONE;
640 break;
641 default:
642 err = -EINVAL;
643 }
644 if (err)
645 break;
646
647 hdr.dxferp = cgc.buffer;
648 hdr.sbp = cgc.sense;
649 if (hdr.sbp)
650 hdr.mx_sb_len = sizeof(struct request_sense);
Tim Wrightad337592008-07-27 17:50:38 -0700651 hdr.timeout = jiffies_to_msecs(cgc.timeout);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652 hdr.cmdp = ((struct cdrom_generic_command __user*) arg)->cmd;
653 hdr.cmd_len = sizeof(cgc.cmd);
654
Al Viro74f3c8a2007-08-27 15:38:10 -0400655 err = sg_io(q, bd_disk, &hdr, mode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656 if (err == -EFAULT)
657 break;
658
659 if (hdr.status)
660 err = -EIO;
661
662 cgc.stat = err;
663 cgc.buflen = hdr.resid;
664 if (copy_to_user(arg, &cgc, sizeof(cgc)))
665 err = -EFAULT;
666
667 break;
668 }
669
670 /*
671 * old junk scsi send command ioctl
672 */
673 case SCSI_IOCTL_SEND_COMMAND:
674 printk(KERN_WARNING "program %s is using a deprecated SCSI ioctl, please convert it to SG_IO\n", current->comm);
675 err = -EINVAL;
676 if (!arg)
677 break;
678
Al Viro74f3c8a2007-08-27 15:38:10 -0400679 err = sg_scsi_ioctl(q, bd_disk, mode, arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700680 break;
681 case CDROMCLOSETRAY:
Ben Collinsf98d2df2005-12-19 11:49:24 -0800682 err = blk_send_start_stop(q, bd_disk, 0x03);
683 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700684 case CDROMEJECT:
Ben Collinsf98d2df2005-12-19 11:49:24 -0800685 err = blk_send_start_stop(q, bd_disk, 0x02);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700686 break;
687 default:
688 err = -ENOTTY;
689 }
690
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691 return err;
692}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700693EXPORT_SYMBOL(scsi_cmd_ioctl);
Jens Axboe018e0442009-06-26 16:27:10 +0200694
Paolo Bonzini0bfc96c2012-01-12 16:01:28 +0100695int scsi_verify_blk_ioctl(struct block_device *bd, unsigned int cmd)
696{
697 if (bd && bd == bd->bd_contains)
698 return 0;
699
700 /* Actually none of these is particularly useful on a partition,
701 * but they are safe.
702 */
703 switch (cmd) {
704 case SCSI_IOCTL_GET_IDLUN:
705 case SCSI_IOCTL_GET_BUS_NUMBER:
706 case SCSI_IOCTL_GET_PCI:
707 case SCSI_IOCTL_PROBE_HOST:
708 case SG_GET_VERSION_NUM:
709 case SG_SET_TIMEOUT:
710 case SG_GET_TIMEOUT:
711 case SG_GET_RESERVED_SIZE:
712 case SG_SET_RESERVED_SIZE:
713 case SG_EMULATED_HOST:
714 return 0;
715 case CDROM_GET_CAPABILITY:
716 /* Keep this until we remove the printk below. udev sends it
717 * and we do not want to spam dmesg about it. CD-ROMs do
718 * not have partitions, so we get here only for disks.
719 */
720 return -ENOIOCTLCMD;
721 default:
722 break;
723 }
724
Jan Kara6d935922012-06-15 12:52:46 +0200725 if (capable(CAP_SYS_RAWIO))
726 return 0;
727
Paolo Bonzini0bfc96c2012-01-12 16:01:28 +0100728 /* In particular, rule out all resets and host-specific ioctls. */
729 printk_ratelimited(KERN_WARNING
730 "%s: sending ioctl %x to a partition!\n", current->comm, cmd);
731
Jan Kara6d935922012-06-15 12:52:46 +0200732 return -ENOIOCTLCMD;
Paolo Bonzini0bfc96c2012-01-12 16:01:28 +0100733}
734EXPORT_SYMBOL(scsi_verify_blk_ioctl);
735
Paolo Bonzini577ebb32012-01-12 16:01:27 +0100736int scsi_cmd_blk_ioctl(struct block_device *bd, fmode_t mode,
737 unsigned int cmd, void __user *arg)
738{
Paolo Bonzini0bfc96c2012-01-12 16:01:28 +0100739 int ret;
740
741 ret = scsi_verify_blk_ioctl(bd, cmd);
742 if (ret < 0)
743 return ret;
744
Paolo Bonzini577ebb32012-01-12 16:01:27 +0100745 return scsi_cmd_ioctl(bd->bd_disk->queue, bd->bd_disk, mode, cmd, arg);
746}
747EXPORT_SYMBOL(scsi_cmd_blk_ioctl);
748
H Hartley Sweeten476d42f2009-11-04 09:10:33 +0100749static int __init blk_scsi_ioctl_init(void)
Jens Axboe018e0442009-06-26 16:27:10 +0200750{
751 blk_set_cmd_filter_defaults(&blk_default_cmd_filter);
752 return 0;
753}
FUJITA Tomonori76da0342009-07-09 09:48:28 +0200754fs_initcall(blk_scsi_ioctl_init);