blob: 28163fad3c5d8800661e2b2c8868300a99e162c2 [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
Akinobu Mita9b4231b2014-05-25 21:43:34 +090085static int max_sectors_bytes(struct request_queue *q)
86{
87 unsigned int max_sectors = queue_max_sectors(q);
88
89 max_sectors = min_t(unsigned int, max_sectors, INT_MAX >> 9);
90
91 return max_sectors << 9;
92}
93
Jens Axboe165125e2007-07-24 09:28:11 +020094static int sg_get_reserved_size(struct request_queue *q, int __user *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -070095{
Akinobu Mita9b4231b2014-05-25 21:43:34 +090096 int val = min_t(int, q->sg_reserved_size, max_sectors_bytes(q));
Alan Stern44ec9542007-02-20 11:01:57 -050097
98 return put_user(val, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -070099}
100
Jens Axboe165125e2007-07-24 09:28:11 +0200101static int sg_set_reserved_size(struct request_queue *q, int __user *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102{
103 int size, err = get_user(size, p);
104
105 if (err)
106 return err;
107
108 if (size < 0)
109 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110
Akinobu Mita9b4231b2014-05-25 21:43:34 +0900111 q->sg_reserved_size = min(size, max_sectors_bytes(q));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 return 0;
113}
114
115/*
116 * will always return that we are ATAPI even for a real SCSI drive, I'm not
117 * so sure this is worth doing anything about (why would you care??)
118 */
Jens Axboe165125e2007-07-24 09:28:11 +0200119static int sg_emulated_host(struct request_queue *q, int __user *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120{
121 return put_user(1, p);
122}
123
Jens Axboe018e0442009-06-26 16:27:10 +0200124static void blk_set_cmd_filter_defaults(struct blk_cmd_filter *filter)
FUJITA Tomonoriabf54392008-08-16 14:10:05 +0900125{
126 /* Basic read-only commands */
127 __set_bit(TEST_UNIT_READY, filter->read_ok);
128 __set_bit(REQUEST_SENSE, filter->read_ok);
129 __set_bit(READ_6, filter->read_ok);
130 __set_bit(READ_10, filter->read_ok);
131 __set_bit(READ_12, filter->read_ok);
132 __set_bit(READ_16, filter->read_ok);
133 __set_bit(READ_BUFFER, filter->read_ok);
134 __set_bit(READ_DEFECT_DATA, filter->read_ok);
135 __set_bit(READ_CAPACITY, filter->read_ok);
136 __set_bit(READ_LONG, filter->read_ok);
137 __set_bit(INQUIRY, filter->read_ok);
138 __set_bit(MODE_SENSE, filter->read_ok);
139 __set_bit(MODE_SENSE_10, filter->read_ok);
140 __set_bit(LOG_SENSE, filter->read_ok);
141 __set_bit(START_STOP, filter->read_ok);
142 __set_bit(GPCMD_VERIFY_10, filter->read_ok);
143 __set_bit(VERIFY_16, filter->read_ok);
144 __set_bit(REPORT_LUNS, filter->read_ok);
Hannes Reineckeeb846d92014-11-17 14:25:19 +0100145 __set_bit(SERVICE_ACTION_IN_16, filter->read_ok);
FUJITA Tomonoriabf54392008-08-16 14:10:05 +0900146 __set_bit(RECEIVE_DIAGNOSTIC, filter->read_ok);
147 __set_bit(MAINTENANCE_IN, filter->read_ok);
148 __set_bit(GPCMD_READ_BUFFER_CAPACITY, filter->read_ok);
149
150 /* Audio CD commands */
151 __set_bit(GPCMD_PLAY_CD, filter->read_ok);
152 __set_bit(GPCMD_PLAY_AUDIO_10, filter->read_ok);
153 __set_bit(GPCMD_PLAY_AUDIO_MSF, filter->read_ok);
154 __set_bit(GPCMD_PLAY_AUDIO_TI, filter->read_ok);
155 __set_bit(GPCMD_PAUSE_RESUME, filter->read_ok);
156
157 /* CD/DVD data reading */
158 __set_bit(GPCMD_READ_CD, filter->read_ok);
159 __set_bit(GPCMD_READ_CD_MSF, filter->read_ok);
160 __set_bit(GPCMD_READ_DISC_INFO, filter->read_ok);
161 __set_bit(GPCMD_READ_CDVD_CAPACITY, filter->read_ok);
162 __set_bit(GPCMD_READ_DVD_STRUCTURE, filter->read_ok);
163 __set_bit(GPCMD_READ_HEADER, filter->read_ok);
164 __set_bit(GPCMD_READ_TRACK_RZONE_INFO, filter->read_ok);
165 __set_bit(GPCMD_READ_SUBCHANNEL, filter->read_ok);
166 __set_bit(GPCMD_READ_TOC_PMA_ATIP, filter->read_ok);
167 __set_bit(GPCMD_REPORT_KEY, filter->read_ok);
168 __set_bit(GPCMD_SCAN, filter->read_ok);
169 __set_bit(GPCMD_GET_CONFIGURATION, filter->read_ok);
170 __set_bit(GPCMD_READ_FORMAT_CAPACITIES, filter->read_ok);
171 __set_bit(GPCMD_GET_EVENT_STATUS_NOTIFICATION, filter->read_ok);
172 __set_bit(GPCMD_GET_PERFORMANCE, filter->read_ok);
173 __set_bit(GPCMD_SEEK, filter->read_ok);
174 __set_bit(GPCMD_STOP_PLAY_SCAN, filter->read_ok);
175
176 /* Basic writing commands */
177 __set_bit(WRITE_6, filter->write_ok);
178 __set_bit(WRITE_10, filter->write_ok);
179 __set_bit(WRITE_VERIFY, filter->write_ok);
180 __set_bit(WRITE_12, filter->write_ok);
181 __set_bit(WRITE_VERIFY_12, filter->write_ok);
182 __set_bit(WRITE_16, filter->write_ok);
183 __set_bit(WRITE_LONG, filter->write_ok);
184 __set_bit(WRITE_LONG_2, filter->write_ok);
185 __set_bit(ERASE, filter->write_ok);
186 __set_bit(GPCMD_MODE_SELECT_10, filter->write_ok);
187 __set_bit(MODE_SELECT, filter->write_ok);
188 __set_bit(LOG_SELECT, filter->write_ok);
189 __set_bit(GPCMD_BLANK, filter->write_ok);
190 __set_bit(GPCMD_CLOSE_TRACK, filter->write_ok);
191 __set_bit(GPCMD_FLUSH_CACHE, filter->write_ok);
192 __set_bit(GPCMD_FORMAT_UNIT, filter->write_ok);
193 __set_bit(GPCMD_REPAIR_RZONE_TRACK, filter->write_ok);
194 __set_bit(GPCMD_RESERVE_RZONE_TRACK, filter->write_ok);
195 __set_bit(GPCMD_SEND_DVD_STRUCTURE, filter->write_ok);
196 __set_bit(GPCMD_SEND_EVENT, filter->write_ok);
197 __set_bit(GPCMD_SEND_KEY, filter->write_ok);
198 __set_bit(GPCMD_SEND_OPC, filter->write_ok);
199 __set_bit(GPCMD_SEND_CUE_SHEET, filter->write_ok);
200 __set_bit(GPCMD_SET_SPEED, filter->write_ok);
201 __set_bit(GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL, filter->write_ok);
202 __set_bit(GPCMD_LOAD_UNLOAD, filter->write_ok);
203 __set_bit(GPCMD_SET_STREAMING, filter->write_ok);
xiphmont@xiph.org35e396c2008-08-22 11:12:21 +0200204 __set_bit(GPCMD_SET_READ_AHEAD, filter->write_ok);
FUJITA Tomonoriabf54392008-08-16 14:10:05 +0900205}
Jens Axboe018e0442009-06-26 16:27:10 +0200206
207int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm)
208{
209 struct blk_cmd_filter *filter = &blk_default_cmd_filter;
210
211 /* root can do any command. */
212 if (capable(CAP_SYS_RAWIO))
213 return 0;
214
Jens Axboe018e0442009-06-26 16:27:10 +0200215 /* Anybody who can open the device can do a read-safe command */
216 if (test_bit(cmd[0], filter->read_ok))
217 return 0;
218
219 /* Write-safe commands require a writable open */
220 if (test_bit(cmd[0], filter->write_ok) && has_write_perm)
221 return 0;
222
223 return -EPERM;
224}
225EXPORT_SYMBOL(blk_verify_command);
FUJITA Tomonoriabf54392008-08-16 14:10:05 +0900226
Jens Axboe165125e2007-07-24 09:28:11 +0200227static int blk_fill_sghdr_rq(struct request_queue *q, struct request *rq,
Al Viro5842e512008-09-02 16:35:55 -0400228 struct sg_io_hdr *hdr, fmode_t mode)
Jens Axboe3d6392c2007-07-09 12:38:05 +0200229{
Jens Axboe3d6392c2007-07-09 12:38:05 +0200230 if (copy_from_user(rq->cmd, hdr->cmdp, hdr->cmd_len))
231 return -EFAULT;
Jens Axboe018e0442009-06-26 16:27:10 +0200232 if (blk_verify_command(rq->cmd, mode & FMODE_WRITE))
Jens Axboe3d6392c2007-07-09 12:38:05 +0200233 return -EPERM;
234
235 /*
236 * fill in request structure
237 */
238 rq->cmd_len = hdr->cmd_len;
Jens Axboe3d6392c2007-07-09 12:38:05 +0200239
Tejun Heo24bb8fb2007-12-05 21:28:24 +0100240 rq->timeout = msecs_to_jiffies(hdr->timeout);
Jens Axboe3d6392c2007-07-09 12:38:05 +0200241 if (!rq->timeout)
242 rq->timeout = q->sg_timeout;
243 if (!rq->timeout)
244 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
Linus Torvaldsf2f1fa72008-12-05 14:49:18 -0800245 if (rq->timeout < BLK_MIN_SG_TIMEOUT)
246 rq->timeout = BLK_MIN_SG_TIMEOUT;
Jens Axboe3d6392c2007-07-09 12:38:05 +0200247
248 return 0;
249}
Jens Axboe3d6392c2007-07-09 12:38:05 +0200250
FUJITA Tomonori41e17032007-07-22 10:06:50 +0900251static int blk_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr,
252 struct bio *bio)
Jens Axboe3d6392c2007-07-09 12:38:05 +0200253{
FUJITA Tomonori91e463c2009-04-13 20:03:10 +0200254 int r, ret = 0;
Jens Axboe3d6392c2007-07-09 12:38:05 +0200255
256 /*
257 * fill in all the output members
258 */
259 hdr->status = rq->errors & 0xff;
260 hdr->masked_status = status_byte(rq->errors);
261 hdr->msg_status = msg_byte(rq->errors);
262 hdr->host_status = host_byte(rq->errors);
263 hdr->driver_status = driver_byte(rq->errors);
264 hdr->info = 0;
265 if (hdr->masked_status || hdr->host_status || hdr->driver_status)
266 hdr->info |= SG_INFO_CHECK;
Tejun Heoc3a4d782009-05-07 22:24:37 +0900267 hdr->resid = rq->resid_len;
Jens Axboe3d6392c2007-07-09 12:38:05 +0200268 hdr->sb_len_wr = 0;
269
270 if (rq->sense_len && hdr->sbp) {
271 int len = min((unsigned int) hdr->mx_sb_len, rq->sense_len);
272
273 if (!copy_to_user(hdr->sbp, rq->sense, len))
274 hdr->sb_len_wr = len;
275 else
276 ret = -EFAULT;
277 }
278
FUJITA Tomonori91e463c2009-04-13 20:03:10 +0200279 r = blk_rq_unmap_user(bio);
280 if (!ret)
281 ret = r;
Jens Axboe3d6392c2007-07-09 12:38:05 +0200282
Boaz Harrosh1cd96c22009-03-24 12:35:07 +0100283 return ret;
Jens Axboe3d6392c2007-07-09 12:38:05 +0200284}
Jens Axboe3d6392c2007-07-09 12:38:05 +0200285
Al Viro5842e512008-09-02 16:35:55 -0400286static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
287 struct sg_io_hdr *hdr, fmode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288{
Jens Axboe3d6392c2007-07-09 12:38:05 +0200289 unsigned long start_time;
Kent Overstreete0ce0ea2013-08-07 14:20:17 -0700290 ssize_t ret = 0;
291 int writing = 0;
Douglas Gilbertd1515612014-07-01 10:48:05 -0600292 int at_head = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293 struct request *rq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 char sense[SCSI_SENSE_BUFFERSIZE];
FUJITA Tomonori77d172c2006-12-11 10:01:34 +0100295 struct bio *bio;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296
297 if (hdr->interface_id != 'S')
298 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299
Martin K. Petersenae03bf62009-05-22 17:17:50 -0400300 if (hdr->dxfer_len > (queue_max_hw_sectors(q) << 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 }
Douglas Gilbertd1515612014-07-01 10:48:05 -0600314 if (hdr->flags & SG_FLAG_Q_AT_HEAD)
315 at_head = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316
Christoph Hellwiga57821c2014-08-21 20:39:53 -0500317 ret = -ENOMEM;
Jens Axboedd1cab92005-06-20 14:06:01 +0200318 rq = blk_get_request(q, writing ? WRITE : READ, GFP_KERNEL);
Joe Lawrencea492f072014-08-28 08:15:21 -0600319 if (IS_ERR(rq))
320 return PTR_ERR(rq);
Jens Axboef27b0872014-06-06 07:57:37 -0600321 blk_rq_set_block_pc(rq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322
Christoph Hellwiga57821c2014-08-21 20:39:53 -0500323 if (hdr->cmd_len > BLK_MAX_CDB) {
324 rq->cmd = kzalloc(hdr->cmd_len, GFP_KERNEL);
325 if (!rq->cmd)
326 goto out_put_request;
Jens Axboe3d6392c2007-07-09 12:38:05 +0200327 }
Mike Christie0e75f902006-12-01 10:40:55 +0100328
Christoph Hellwig2cada582014-08-21 20:38:27 -0500329 ret = -EFAULT;
330 if (blk_fill_sghdr_rq(q, rq, hdr, mode))
Christoph Hellwiga57821c2014-08-21 20:39:53 -0500331 goto out_free_cdb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332
Sabrina Dubrocad19d7442014-08-26 16:14:02 +0200333 ret = 0;
James Bottomley f1970ba2005-06-20 14:06:52 +0200334 if (hdr->iovec_count) {
Tejun Heo25636e22009-04-15 22:10:24 +0900335 size_t iov_data_len;
Christian Engelmayer17a05cc2014-01-19 02:08:49 +0100336 struct iovec *iov = NULL;
James Bottomley f1970ba2005-06-20 14:06:52 +0200337
Kent Overstreete0ce0ea2013-08-07 14:20:17 -0700338 ret = rw_copy_check_uvector(-1, hdr->dxferp, hdr->iovec_count,
339 0, NULL, &iov);
Christian Engelmayer17a05cc2014-01-19 02:08:49 +0100340 if (ret < 0) {
341 kfree(iov);
Christoph Hellwiga57821c2014-08-21 20:39:53 -0500342 goto out_free_cdb;
Christian Engelmayer17a05cc2014-01-19 02:08:49 +0100343 }
James Bottomley f1970ba2005-06-20 14:06:52 +0200344
Kent Overstreete0ce0ea2013-08-07 14:20:17 -0700345 iov_data_len = ret;
346 ret = 0;
Jens Axboe9f864c82010-10-29 11:31:42 -0600347
Tejun Heo25636e22009-04-15 22:10:24 +0900348 /* SG_IO howto says that the shorter of the two wins */
Tejun Heo25636e22009-04-15 22:10:24 +0900349 if (hdr->dxfer_len < iov_data_len) {
Jens Axboe9f864c82010-10-29 11:31:42 -0600350 hdr->iovec_count = iov_shorten(iov,
Tejun Heo25636e22009-04-15 22:10:24 +0900351 hdr->iovec_count,
352 hdr->dxfer_len);
353 iov_data_len = hdr->dxfer_len;
354 }
355
Kent Overstreete0ce0ea2013-08-07 14:20:17 -0700356 ret = blk_rq_map_user_iov(q, rq, NULL, (struct sg_iovec *) iov,
357 hdr->iovec_count,
Tejun Heo25636e22009-04-15 22:10:24 +0900358 iov_data_len, GFP_KERNEL);
Kent Overstreete0ce0ea2013-08-07 14:20:17 -0700359 kfree(iov);
James Bottomley f1970ba2005-06-20 14:06:52 +0200360 } else if (hdr->dxfer_len)
FUJITA Tomonori152e2832008-08-28 16:17:06 +0900361 ret = blk_rq_map_user(q, rq, NULL, hdr->dxferp, hdr->dxfer_len,
FUJITA Tomonoria3bce902008-08-28 16:17:05 +0900362 GFP_KERNEL);
James Bottomley f1970ba2005-06-20 14:06:52 +0200363
364 if (ret)
Christoph Hellwiga57821c2014-08-21 20:39:53 -0500365 goto out_free_cdb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366
FUJITA Tomonori77d172c2006-12-11 10:01:34 +0100367 bio = rq->bio;
Jens Axboe3d6392c2007-07-09 12:38:05 +0200368 memset(sense, 0, sizeof(sense));
369 rq->sense = sense;
370 rq->sense_len = 0;
Jens Axboe01840f92006-02-03 08:37:08 +0100371 rq->retries = 0;
372
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373 start_time = jiffies;
374
375 /* ignore return value. All information is passed back to caller
376 * (if he doesn't check that is his problem).
377 * N.B. a non-zero SCSI status is _not_ necessarily an error.
378 */
Douglas Gilbertd1515612014-07-01 10:48:05 -0600379 blk_execute_rq(q, bd_disk, rq, at_head);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380
Tejun Heo24bb8fb2007-12-05 21:28:24 +0100381 hdr->duration = jiffies_to_msecs(jiffies - start_time);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382
Christoph Hellwig2cada582014-08-21 20:38:27 -0500383 ret = blk_complete_sghdr_rq(rq, hdr, bio);
Christoph Hellwiga57821c2014-08-21 20:39:53 -0500384
385out_free_cdb:
386 if (rq->cmd != rq->__cmd)
387 kfree(rq->cmd);
388out_put_request:
Jens Axboedd1cab92005-06-20 14:06:01 +0200389 blk_put_request(rq);
390 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391}
392
Christoph Hellwig21b2f0c2006-03-22 17:52:04 +0100393/**
394 * sg_scsi_ioctl -- handle deprecated SCSI_IOCTL_SEND_COMMAND ioctl
395 * @file: file this ioctl operates on (optional)
396 * @q: request queue to send scsi commands down
397 * @disk: gendisk to operate on (option)
398 * @sic: userspace structure describing the command to perform
399 *
400 * Send down the scsi command described by @sic to the device below
401 * the request queue @q. If @file is non-NULL it's used to perform
402 * fine-grained permission checks that allow users to send down
403 * non-destructive SCSI commands. If the caller has a struct gendisk
404 * available it should be passed in as @disk to allow the low level
405 * driver to use the information contained in it. A non-NULL @disk
406 * is only allowed if the caller knows that the low level driver doesn't
407 * need it (e.g. in the scsi subsystem).
408 *
409 * Notes:
410 * - This interface is deprecated - users should use the SG_IO
411 * interface instead, as this is a more flexible approach to
412 * performing SCSI commands on a device.
413 * - The SCSI command length is determined by examining the 1st byte
414 * of the given command. There is no way to override this.
415 * - Data transfers are limited to PAGE_SIZE
416 * - The length (x + y) must be at least OMAX_SB_LEN bytes long to
417 * accommodate the sense buffer when an error occurs.
418 * The sense buffer is truncated to OMAX_SB_LEN (16) bytes so that
419 * old code will not be surprised.
420 * - If a Unix error occurs (e.g. ENOMEM) then the user will receive
421 * a negative return and the Unix error code in 'errno'.
422 * If the SCSI command succeeds then 0 is returned.
423 * Positive numbers returned are the compacted SCSI error codes (4
424 * bytes in one int) where the lowest byte is the SCSI status.
425 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426#define OMAX_SB_LEN 16 /* For backward compatibility */
Al Viroe915e872008-09-02 17:16:41 -0400427int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode,
428 struct scsi_ioctl_command __user *sic)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429{
430 struct request *rq;
Al Viroaeb5d722008-09-02 15:28:45 -0400431 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432 unsigned int in_len, out_len, bytes, opcode, cmdlen;
433 char *buffer = NULL, sense[SCSI_SENSE_BUFFERSIZE];
434
Christoph Hellwig21b2f0c2006-03-22 17:52:04 +0100435 if (!sic)
436 return -EINVAL;
437
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 /*
439 * get in an out lengths, verify they don't exceed a page worth of data
440 */
441 if (get_user(in_len, &sic->inlen))
442 return -EFAULT;
443 if (get_user(out_len, &sic->outlen))
444 return -EFAULT;
445 if (in_len > PAGE_SIZE || out_len > PAGE_SIZE)
446 return -EINVAL;
447 if (get_user(opcode, sic->data))
448 return -EFAULT;
449
450 bytes = max(in_len, out_len);
451 if (bytes) {
Yoann Padioleaudd00cc42007-07-19 01:49:03 -0700452 buffer = kzalloc(bytes, q->bounce_gfp | GFP_USER| __GFP_NOWARN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453 if (!buffer)
454 return -ENOMEM;
455
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 }
457
458 rq = blk_get_request(q, in_len ? WRITE : READ, __GFP_WAIT);
Joe Lawrencea492f072014-08-28 08:15:21 -0600459 if (IS_ERR(rq)) {
460 err = PTR_ERR(rq);
Tony Battersby92697dc2014-11-10 17:40:02 -0500461 goto error_free_buffer;
Joe Lawrenceeb571ee2014-07-02 15:35:16 -0400462 }
Tony Battersby2ba136d2014-08-22 15:53:35 -0400463 blk_rq_set_block_pc(rq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464
465 cmdlen = COMMAND_SIZE(opcode);
466
467 /*
468 * get command and data to send to device, if any
469 */
470 err = -EFAULT;
471 rq->cmd_len = cmdlen;
472 if (copy_from_user(rq->cmd, sic->data, cmdlen))
473 goto error;
474
Christoph Hellwig21b2f0c2006-03-22 17:52:04 +0100475 if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476 goto error;
477
Jens Axboe018e0442009-06-26 16:27:10 +0200478 err = blk_verify_command(rq->cmd, mode & FMODE_WRITE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479 if (err)
480 goto error;
481
Christoph Hellwig21b2f0c2006-03-22 17:52:04 +0100482 /* default. possible overriden later */
483 rq->retries = 5;
484
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485 switch (opcode) {
Christoph Hellwig21b2f0c2006-03-22 17:52:04 +0100486 case SEND_DIAGNOSTIC:
487 case FORMAT_UNIT:
488 rq->timeout = FORMAT_UNIT_TIMEOUT;
489 rq->retries = 1;
490 break;
491 case START_STOP:
492 rq->timeout = START_STOP_TIMEOUT;
493 break;
494 case MOVE_MEDIUM:
495 rq->timeout = MOVE_MEDIUM_TIMEOUT;
496 break;
497 case READ_ELEMENT_STATUS:
498 rq->timeout = READ_ELEMENT_STATUS_TIMEOUT;
499 break;
500 case READ_DEFECT_DATA:
501 rq->timeout = READ_DEFECT_DATA_TIMEOUT;
502 rq->retries = 1;
503 break;
504 default:
Jens Axboe3d6392c2007-07-09 12:38:05 +0200505 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
Christoph Hellwig21b2f0c2006-03-22 17:52:04 +0100506 break;
507 }
508
509 if (bytes && blk_rq_map_kern(q, rq, buffer, bytes, __GFP_WAIT)) {
510 err = DRIVER_ERROR << 24;
Jan Kara84ce0f02014-10-22 20:13:39 -0600511 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512 }
513
514 memset(sense, 0, sizeof(sense));
515 rq->sense = sense;
516 rq->sense_len = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517
Christoph Hellwig21b2f0c2006-03-22 17:52:04 +0100518 blk_execute_rq(q, disk, rq, 0);
519
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:
Tony Battersby92697dc2014-11-10 17:40:02 -0500534 blk_put_request(rq);
535
536error_free_buffer:
Joe Lawrenceeb571ee2014-07-02 15:35:16 -0400537 kfree(buffer);
Tony Battersby92697dc2014-11-10 17:40:02 -0500538
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539 return err;
540}
Christoph Hellwig21b2f0c2006-03-22 17:52:04 +0100541EXPORT_SYMBOL_GPL(sg_scsi_ioctl);
Ben Collinsf98d2df2005-12-19 11:49:24 -0800542
543/* Send basic block requests */
Jens Axboe165125e2007-07-24 09:28:11 +0200544static int __blk_send_generic(struct request_queue *q, struct gendisk *bd_disk,
545 int cmd, int data)
Ben Collinsf98d2df2005-12-19 11:49:24 -0800546{
547 struct request *rq;
548 int err;
549
550 rq = blk_get_request(q, WRITE, __GFP_WAIT);
Joe Lawrencea492f072014-08-28 08:15:21 -0600551 if (IS_ERR(rq))
552 return PTR_ERR(rq);
Jens Axboef27b0872014-06-06 07:57:37 -0600553 blk_rq_set_block_pc(rq);
Jens Axboe3d6392c2007-07-09 12:38:05 +0200554 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
Ben Collinsf98d2df2005-12-19 11:49:24 -0800555 rq->cmd[0] = cmd;
556 rq->cmd[4] = data;
557 rq->cmd_len = 6;
558 err = blk_execute_rq(q, bd_disk, rq, 0);
559 blk_put_request(rq);
560
561 return err;
562}
563
Jens Axboe165125e2007-07-24 09:28:11 +0200564static inline int blk_send_start_stop(struct request_queue *q,
565 struct gendisk *bd_disk, int data)
Ben Collinsf98d2df2005-12-19 11:49:24 -0800566{
567 return __blk_send_generic(q, bd_disk, GPCMD_START_STOP_UNIT, data);
568}
569
Al Viro74f3c8a2007-08-27 15:38:10 -0400570int scsi_cmd_ioctl(struct request_queue *q, struct gendisk *bd_disk, fmode_t mode,
571 unsigned int cmd, void __user *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572{
Ben Collinsf98d2df2005-12-19 11:49:24 -0800573 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574
Tejun Heo315fcee2011-10-19 14:31:25 +0200575 if (!q)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576 return -ENXIO;
577
578 switch (cmd) {
579 /*
580 * new sgv3 interface
581 */
582 case SG_GET_VERSION_NUM:
583 err = sg_get_version(arg);
584 break;
585 case SCSI_IOCTL_GET_IDLUN:
586 err = scsi_get_idlun(q, arg);
587 break;
588 case SCSI_IOCTL_GET_BUS_NUMBER:
589 err = scsi_get_bus(q, arg);
590 break;
591 case SG_SET_TIMEOUT:
592 err = sg_set_timeout(q, arg);
593 break;
594 case SG_GET_TIMEOUT:
595 err = sg_get_timeout(q);
596 break;
597 case SG_GET_RESERVED_SIZE:
598 err = sg_get_reserved_size(q, arg);
599 break;
600 case SG_SET_RESERVED_SIZE:
601 err = sg_set_reserved_size(q, arg);
602 break;
603 case SG_EMULATED_HOST:
604 err = sg_emulated_host(q, arg);
605 break;
606 case SG_IO: {
607 struct sg_io_hdr hdr;
608
609 err = -EFAULT;
610 if (copy_from_user(&hdr, arg, sizeof(hdr)))
611 break;
Al Viro74f3c8a2007-08-27 15:38:10 -0400612 err = sg_io(q, bd_disk, &hdr, mode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613 if (err == -EFAULT)
614 break;
615
616 if (copy_to_user(arg, &hdr, sizeof(hdr)))
617 err = -EFAULT;
618 break;
619 }
620 case CDROM_SEND_PACKET: {
621 struct cdrom_generic_command cgc;
622 struct sg_io_hdr hdr;
623
624 err = -EFAULT;
625 if (copy_from_user(&cgc, arg, sizeof(cgc)))
626 break;
627 cgc.timeout = clock_t_to_jiffies(cgc.timeout);
628 memset(&hdr, 0, sizeof(hdr));
629 hdr.interface_id = 'S';
630 hdr.cmd_len = sizeof(cgc.cmd);
631 hdr.dxfer_len = cgc.buflen;
632 err = 0;
633 switch (cgc.data_direction) {
634 case CGC_DATA_UNKNOWN:
635 hdr.dxfer_direction = SG_DXFER_UNKNOWN;
636 break;
637 case CGC_DATA_WRITE:
638 hdr.dxfer_direction = SG_DXFER_TO_DEV;
639 break;
640 case CGC_DATA_READ:
641 hdr.dxfer_direction = SG_DXFER_FROM_DEV;
642 break;
643 case CGC_DATA_NONE:
644 hdr.dxfer_direction = SG_DXFER_NONE;
645 break;
646 default:
647 err = -EINVAL;
648 }
649 if (err)
650 break;
651
652 hdr.dxferp = cgc.buffer;
653 hdr.sbp = cgc.sense;
654 if (hdr.sbp)
655 hdr.mx_sb_len = sizeof(struct request_sense);
Tim Wrightad337592008-07-27 17:50:38 -0700656 hdr.timeout = jiffies_to_msecs(cgc.timeout);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657 hdr.cmdp = ((struct cdrom_generic_command __user*) arg)->cmd;
658 hdr.cmd_len = sizeof(cgc.cmd);
659
Al Viro74f3c8a2007-08-27 15:38:10 -0400660 err = sg_io(q, bd_disk, &hdr, mode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661 if (err == -EFAULT)
662 break;
663
664 if (hdr.status)
665 err = -EIO;
666
667 cgc.stat = err;
668 cgc.buflen = hdr.resid;
669 if (copy_to_user(arg, &cgc, sizeof(cgc)))
670 err = -EFAULT;
671
672 break;
673 }
674
675 /*
676 * old junk scsi send command ioctl
677 */
678 case SCSI_IOCTL_SEND_COMMAND:
679 printk(KERN_WARNING "program %s is using a deprecated SCSI ioctl, please convert it to SG_IO\n", current->comm);
680 err = -EINVAL;
681 if (!arg)
682 break;
683
Al Viro74f3c8a2007-08-27 15:38:10 -0400684 err = sg_scsi_ioctl(q, bd_disk, mode, arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685 break;
686 case CDROMCLOSETRAY:
Ben Collinsf98d2df2005-12-19 11:49:24 -0800687 err = blk_send_start_stop(q, bd_disk, 0x03);
688 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700689 case CDROMEJECT:
Ben Collinsf98d2df2005-12-19 11:49:24 -0800690 err = blk_send_start_stop(q, bd_disk, 0x02);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691 break;
692 default:
693 err = -ENOTTY;
694 }
695
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696 return err;
697}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698EXPORT_SYMBOL(scsi_cmd_ioctl);
Jens Axboe018e0442009-06-26 16:27:10 +0200699
Paolo Bonzini0bfc96c2012-01-12 16:01:28 +0100700int scsi_verify_blk_ioctl(struct block_device *bd, unsigned int cmd)
701{
702 if (bd && bd == bd->bd_contains)
703 return 0;
704
705 /* Actually none of these is particularly useful on a partition,
706 * but they are safe.
707 */
708 switch (cmd) {
709 case SCSI_IOCTL_GET_IDLUN:
710 case SCSI_IOCTL_GET_BUS_NUMBER:
711 case SCSI_IOCTL_GET_PCI:
712 case SCSI_IOCTL_PROBE_HOST:
713 case SG_GET_VERSION_NUM:
714 case SG_SET_TIMEOUT:
715 case SG_GET_TIMEOUT:
716 case SG_GET_RESERVED_SIZE:
717 case SG_SET_RESERVED_SIZE:
718 case SG_EMULATED_HOST:
719 return 0;
720 case CDROM_GET_CAPABILITY:
721 /* Keep this until we remove the printk below. udev sends it
722 * and we do not want to spam dmesg about it. CD-ROMs do
723 * not have partitions, so we get here only for disks.
724 */
725 return -ENOIOCTLCMD;
726 default:
727 break;
728 }
729
Jan Kara6d935922012-06-15 12:52:46 +0200730 if (capable(CAP_SYS_RAWIO))
731 return 0;
732
Paolo Bonzini0bfc96c2012-01-12 16:01:28 +0100733 /* In particular, rule out all resets and host-specific ioctls. */
734 printk_ratelimited(KERN_WARNING
735 "%s: sending ioctl %x to a partition!\n", current->comm, cmd);
736
Jan Kara6d935922012-06-15 12:52:46 +0200737 return -ENOIOCTLCMD;
Paolo Bonzini0bfc96c2012-01-12 16:01:28 +0100738}
739EXPORT_SYMBOL(scsi_verify_blk_ioctl);
740
Paolo Bonzini577ebb32012-01-12 16:01:27 +0100741int scsi_cmd_blk_ioctl(struct block_device *bd, fmode_t mode,
742 unsigned int cmd, void __user *arg)
743{
Paolo Bonzini0bfc96c2012-01-12 16:01:28 +0100744 int ret;
745
746 ret = scsi_verify_blk_ioctl(bd, cmd);
747 if (ret < 0)
748 return ret;
749
Paolo Bonzini577ebb32012-01-12 16:01:27 +0100750 return scsi_cmd_ioctl(bd->bd_disk->queue, bd->bd_disk, mode, cmd, arg);
751}
752EXPORT_SYMBOL(scsi_cmd_blk_ioctl);
753
H Hartley Sweeten476d42f2009-11-04 09:10:33 +0100754static int __init blk_scsi_ioctl_init(void)
Jens Axboe018e0442009-06-26 16:27:10 +0200755{
756 blk_set_cmd_filter_defaults(&blk_default_cmd_filter);
757 return 0;
758}
FUJITA Tomonori76da0342009-07-09 09:48:28 +0200759fs_initcall(blk_scsi_ioctl_init);