| 1 | /* |
| 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> |
| 24 | #include <linux/capability.h> |
| 25 | #include <linux/completion.h> |
| 26 | #include <linux/cdrom.h> |
| 27 | #include <linux/ratelimit.h> |
| 28 | #include <linux/slab.h> |
| 29 | #include <linux/times.h> |
| 30 | #include <linux/uio.h> |
| 31 | #include <linux/uaccess.h> |
| 32 | |
| 33 | #include <scsi/scsi.h> |
| 34 | #include <scsi/scsi_ioctl.h> |
| 35 | #include <scsi/scsi_cmnd.h> |
| 36 | |
| 37 | struct blk_cmd_filter { |
| 38 | unsigned long read_ok[BLK_SCSI_CMD_PER_LONG]; |
| 39 | unsigned long write_ok[BLK_SCSI_CMD_PER_LONG]; |
| 40 | }; |
| 41 | |
| 42 | static struct blk_cmd_filter blk_default_cmd_filter; |
| 43 | |
| 44 | /* Command group 3 is reserved and should never be used. */ |
| 45 | const unsigned char scsi_command_size_tbl[8] = |
| 46 | { |
| 47 | 6, 10, 10, 12, |
| 48 | 16, 12, 10, 10 |
| 49 | }; |
| 50 | EXPORT_SYMBOL(scsi_command_size_tbl); |
| 51 | |
| 52 | #include <scsi/sg.h> |
| 53 | |
| 54 | static int sg_get_version(int __user *p) |
| 55 | { |
| 56 | static const int sg_version_num = 30527; |
| 57 | return put_user(sg_version_num, p); |
| 58 | } |
| 59 | |
| 60 | static int scsi_get_idlun(struct request_queue *q, int __user *p) |
| 61 | { |
| 62 | return put_user(0, p); |
| 63 | } |
| 64 | |
| 65 | static int scsi_get_bus(struct request_queue *q, int __user *p) |
| 66 | { |
| 67 | return put_user(0, p); |
| 68 | } |
| 69 | |
| 70 | static int sg_get_timeout(struct request_queue *q) |
| 71 | { |
| 72 | return jiffies_to_clock_t(q->sg_timeout); |
| 73 | } |
| 74 | |
| 75 | static int sg_set_timeout(struct request_queue *q, int __user *p) |
| 76 | { |
| 77 | int timeout, err = get_user(timeout, p); |
| 78 | |
| 79 | if (!err) |
| 80 | q->sg_timeout = clock_t_to_jiffies(timeout); |
| 81 | |
| 82 | return err; |
| 83 | } |
| 84 | |
| 85 | static 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 | |
| 94 | static int sg_get_reserved_size(struct request_queue *q, int __user *p) |
| 95 | { |
| 96 | int val = min_t(int, q->sg_reserved_size, max_sectors_bytes(q)); |
| 97 | |
| 98 | return put_user(val, p); |
| 99 | } |
| 100 | |
| 101 | static int sg_set_reserved_size(struct request_queue *q, int __user *p) |
| 102 | { |
| 103 | int size, err = get_user(size, p); |
| 104 | |
| 105 | if (err) |
| 106 | return err; |
| 107 | |
| 108 | if (size < 0) |
| 109 | return -EINVAL; |
| 110 | |
| 111 | q->sg_reserved_size = min(size, max_sectors_bytes(q)); |
| 112 | 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 | */ |
| 119 | static int sg_emulated_host(struct request_queue *q, int __user *p) |
| 120 | { |
| 121 | return put_user(1, p); |
| 122 | } |
| 123 | |
| 124 | static void blk_set_cmd_filter_defaults(struct blk_cmd_filter *filter) |
| 125 | { |
| 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); |
| 145 | __set_bit(SERVICE_ACTION_IN_16, filter->read_ok); |
| 146 | __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(WRITE_SAME, filter->write_ok); |
| 186 | __set_bit(WRITE_SAME_16, filter->write_ok); |
| 187 | __set_bit(WRITE_SAME_32, filter->write_ok); |
| 188 | __set_bit(ERASE, filter->write_ok); |
| 189 | __set_bit(GPCMD_MODE_SELECT_10, filter->write_ok); |
| 190 | __set_bit(MODE_SELECT, filter->write_ok); |
| 191 | __set_bit(LOG_SELECT, filter->write_ok); |
| 192 | __set_bit(GPCMD_BLANK, filter->write_ok); |
| 193 | __set_bit(GPCMD_CLOSE_TRACK, filter->write_ok); |
| 194 | __set_bit(GPCMD_FLUSH_CACHE, filter->write_ok); |
| 195 | __set_bit(GPCMD_FORMAT_UNIT, filter->write_ok); |
| 196 | __set_bit(GPCMD_REPAIR_RZONE_TRACK, filter->write_ok); |
| 197 | __set_bit(GPCMD_RESERVE_RZONE_TRACK, filter->write_ok); |
| 198 | __set_bit(GPCMD_SEND_DVD_STRUCTURE, filter->write_ok); |
| 199 | __set_bit(GPCMD_SEND_EVENT, filter->write_ok); |
| 200 | __set_bit(GPCMD_SEND_KEY, filter->write_ok); |
| 201 | __set_bit(GPCMD_SEND_OPC, filter->write_ok); |
| 202 | __set_bit(GPCMD_SEND_CUE_SHEET, filter->write_ok); |
| 203 | __set_bit(GPCMD_SET_SPEED, filter->write_ok); |
| 204 | __set_bit(GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL, filter->write_ok); |
| 205 | __set_bit(GPCMD_LOAD_UNLOAD, filter->write_ok); |
| 206 | __set_bit(GPCMD_SET_STREAMING, filter->write_ok); |
| 207 | __set_bit(GPCMD_SET_READ_AHEAD, filter->write_ok); |
| 208 | } |
| 209 | |
| 210 | int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm) |
| 211 | { |
| 212 | struct blk_cmd_filter *filter = &blk_default_cmd_filter; |
| 213 | |
| 214 | /* root can do any command. */ |
| 215 | if (capable(CAP_SYS_RAWIO)) |
| 216 | return 0; |
| 217 | |
| 218 | /* Anybody who can open the device can do a read-safe command */ |
| 219 | if (test_bit(cmd[0], filter->read_ok)) |
| 220 | return 0; |
| 221 | |
| 222 | /* Write-safe commands require a writable open */ |
| 223 | if (test_bit(cmd[0], filter->write_ok) && has_write_perm) |
| 224 | return 0; |
| 225 | |
| 226 | return -EPERM; |
| 227 | } |
| 228 | EXPORT_SYMBOL(blk_verify_command); |
| 229 | |
| 230 | static int blk_fill_sghdr_rq(struct request_queue *q, struct request *rq, |
| 231 | struct sg_io_hdr *hdr, fmode_t mode) |
| 232 | { |
| 233 | struct scsi_request *req = scsi_req(rq); |
| 234 | |
| 235 | if (copy_from_user(req->cmd, hdr->cmdp, hdr->cmd_len)) |
| 236 | return -EFAULT; |
| 237 | if (blk_verify_command(req->cmd, mode & FMODE_WRITE)) |
| 238 | return -EPERM; |
| 239 | |
| 240 | /* |
| 241 | * fill in request structure |
| 242 | */ |
| 243 | req->cmd_len = hdr->cmd_len; |
| 244 | |
| 245 | rq->timeout = msecs_to_jiffies(hdr->timeout); |
| 246 | if (!rq->timeout) |
| 247 | rq->timeout = q->sg_timeout; |
| 248 | if (!rq->timeout) |
| 249 | rq->timeout = BLK_DEFAULT_SG_TIMEOUT; |
| 250 | if (rq->timeout < BLK_MIN_SG_TIMEOUT) |
| 251 | rq->timeout = BLK_MIN_SG_TIMEOUT; |
| 252 | |
| 253 | return 0; |
| 254 | } |
| 255 | |
| 256 | static int blk_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr, |
| 257 | struct bio *bio) |
| 258 | { |
| 259 | struct scsi_request *req = scsi_req(rq); |
| 260 | int r, ret = 0; |
| 261 | |
| 262 | /* |
| 263 | * fill in all the output members |
| 264 | */ |
| 265 | hdr->status = req->result & 0xff; |
| 266 | hdr->masked_status = status_byte(req->result); |
| 267 | hdr->msg_status = msg_byte(req->result); |
| 268 | hdr->host_status = host_byte(req->result); |
| 269 | hdr->driver_status = driver_byte(req->result); |
| 270 | hdr->info = 0; |
| 271 | if (hdr->masked_status || hdr->host_status || hdr->driver_status) |
| 272 | hdr->info |= SG_INFO_CHECK; |
| 273 | hdr->resid = req->resid_len; |
| 274 | hdr->sb_len_wr = 0; |
| 275 | |
| 276 | if (req->sense_len && hdr->sbp) { |
| 277 | int len = min((unsigned int) hdr->mx_sb_len, req->sense_len); |
| 278 | |
| 279 | if (!copy_to_user(hdr->sbp, req->sense, len)) |
| 280 | hdr->sb_len_wr = len; |
| 281 | else |
| 282 | ret = -EFAULT; |
| 283 | } |
| 284 | |
| 285 | r = blk_rq_unmap_user(bio); |
| 286 | if (!ret) |
| 287 | ret = r; |
| 288 | |
| 289 | return ret; |
| 290 | } |
| 291 | |
| 292 | static int sg_io(struct request_queue *q, struct gendisk *bd_disk, |
| 293 | struct sg_io_hdr *hdr, fmode_t mode) |
| 294 | { |
| 295 | unsigned long start_time; |
| 296 | ssize_t ret = 0; |
| 297 | int writing = 0; |
| 298 | int at_head = 0; |
| 299 | struct request *rq; |
| 300 | struct scsi_request *req; |
| 301 | struct bio *bio; |
| 302 | |
| 303 | if (hdr->interface_id != 'S') |
| 304 | return -EINVAL; |
| 305 | |
| 306 | if (hdr->dxfer_len > (queue_max_hw_sectors(q) << 9)) |
| 307 | return -EIO; |
| 308 | |
| 309 | if (hdr->dxfer_len) |
| 310 | switch (hdr->dxfer_direction) { |
| 311 | default: |
| 312 | return -EINVAL; |
| 313 | case SG_DXFER_TO_DEV: |
| 314 | writing = 1; |
| 315 | break; |
| 316 | case SG_DXFER_TO_FROM_DEV: |
| 317 | case SG_DXFER_FROM_DEV: |
| 318 | break; |
| 319 | } |
| 320 | if (hdr->flags & SG_FLAG_Q_AT_HEAD) |
| 321 | at_head = 1; |
| 322 | |
| 323 | ret = -ENOMEM; |
| 324 | rq = blk_get_request(q, writing ? REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN, |
| 325 | GFP_KERNEL); |
| 326 | if (IS_ERR(rq)) |
| 327 | return PTR_ERR(rq); |
| 328 | req = scsi_req(rq); |
| 329 | |
| 330 | if (hdr->cmd_len > BLK_MAX_CDB) { |
| 331 | req->cmd = kzalloc(hdr->cmd_len, GFP_KERNEL); |
| 332 | if (!req->cmd) |
| 333 | goto out_put_request; |
| 334 | } |
| 335 | |
| 336 | ret = blk_fill_sghdr_rq(q, rq, hdr, mode); |
| 337 | if (ret < 0) |
| 338 | goto out_free_cdb; |
| 339 | |
| 340 | ret = 0; |
| 341 | if (hdr->iovec_count) { |
| 342 | struct iov_iter i; |
| 343 | struct iovec *iov = NULL; |
| 344 | |
| 345 | ret = import_iovec(rq_data_dir(rq), |
| 346 | hdr->dxferp, hdr->iovec_count, |
| 347 | 0, &iov, &i); |
| 348 | if (ret < 0) |
| 349 | goto out_free_cdb; |
| 350 | |
| 351 | /* SG_IO howto says that the shorter of the two wins */ |
| 352 | iov_iter_truncate(&i, hdr->dxfer_len); |
| 353 | |
| 354 | ret = blk_rq_map_user_iov(q, rq, NULL, &i, GFP_KERNEL); |
| 355 | kfree(iov); |
| 356 | } else if (hdr->dxfer_len) |
| 357 | ret = blk_rq_map_user(q, rq, NULL, hdr->dxferp, hdr->dxfer_len, |
| 358 | GFP_KERNEL); |
| 359 | |
| 360 | if (ret) |
| 361 | goto out_free_cdb; |
| 362 | |
| 363 | bio = rq->bio; |
| 364 | req->retries = 0; |
| 365 | |
| 366 | start_time = jiffies; |
| 367 | |
| 368 | /* ignore return value. All information is passed back to caller |
| 369 | * (if he doesn't check that is his problem). |
| 370 | * N.B. a non-zero SCSI status is _not_ necessarily an error. |
| 371 | */ |
| 372 | blk_execute_rq(q, bd_disk, rq, at_head); |
| 373 | |
| 374 | hdr->duration = jiffies_to_msecs(jiffies - start_time); |
| 375 | |
| 376 | ret = blk_complete_sghdr_rq(rq, hdr, bio); |
| 377 | |
| 378 | out_free_cdb: |
| 379 | scsi_req_free_cmd(req); |
| 380 | out_put_request: |
| 381 | blk_put_request(rq); |
| 382 | return ret; |
| 383 | } |
| 384 | |
| 385 | /** |
| 386 | * sg_scsi_ioctl -- handle deprecated SCSI_IOCTL_SEND_COMMAND ioctl |
| 387 | * @file: file this ioctl operates on (optional) |
| 388 | * @q: request queue to send scsi commands down |
| 389 | * @disk: gendisk to operate on (option) |
| 390 | * @sic: userspace structure describing the command to perform |
| 391 | * |
| 392 | * Send down the scsi command described by @sic to the device below |
| 393 | * the request queue @q. If @file is non-NULL it's used to perform |
| 394 | * fine-grained permission checks that allow users to send down |
| 395 | * non-destructive SCSI commands. If the caller has a struct gendisk |
| 396 | * available it should be passed in as @disk to allow the low level |
| 397 | * driver to use the information contained in it. A non-NULL @disk |
| 398 | * is only allowed if the caller knows that the low level driver doesn't |
| 399 | * need it (e.g. in the scsi subsystem). |
| 400 | * |
| 401 | * Notes: |
| 402 | * - This interface is deprecated - users should use the SG_IO |
| 403 | * interface instead, as this is a more flexible approach to |
| 404 | * performing SCSI commands on a device. |
| 405 | * - The SCSI command length is determined by examining the 1st byte |
| 406 | * of the given command. There is no way to override this. |
| 407 | * - Data transfers are limited to PAGE_SIZE |
| 408 | * - The length (x + y) must be at least OMAX_SB_LEN bytes long to |
| 409 | * accommodate the sense buffer when an error occurs. |
| 410 | * The sense buffer is truncated to OMAX_SB_LEN (16) bytes so that |
| 411 | * old code will not be surprised. |
| 412 | * - If a Unix error occurs (e.g. ENOMEM) then the user will receive |
| 413 | * a negative return and the Unix error code in 'errno'. |
| 414 | * If the SCSI command succeeds then 0 is returned. |
| 415 | * Positive numbers returned are the compacted SCSI error codes (4 |
| 416 | * bytes in one int) where the lowest byte is the SCSI status. |
| 417 | */ |
| 418 | #define OMAX_SB_LEN 16 /* For backward compatibility */ |
| 419 | int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode, |
| 420 | struct scsi_ioctl_command __user *sic) |
| 421 | { |
| 422 | struct request *rq; |
| 423 | struct scsi_request *req; |
| 424 | int err; |
| 425 | unsigned int in_len, out_len, bytes, opcode, cmdlen; |
| 426 | char *buffer = NULL; |
| 427 | |
| 428 | if (!sic) |
| 429 | return -EINVAL; |
| 430 | |
| 431 | /* |
| 432 | * get in an out lengths, verify they don't exceed a page worth of data |
| 433 | */ |
| 434 | if (get_user(in_len, &sic->inlen)) |
| 435 | return -EFAULT; |
| 436 | if (get_user(out_len, &sic->outlen)) |
| 437 | return -EFAULT; |
| 438 | if (in_len > PAGE_SIZE || out_len > PAGE_SIZE) |
| 439 | return -EINVAL; |
| 440 | if (get_user(opcode, sic->data)) |
| 441 | return -EFAULT; |
| 442 | |
| 443 | bytes = max(in_len, out_len); |
| 444 | if (bytes) { |
| 445 | buffer = kzalloc(bytes, q->bounce_gfp | GFP_USER| __GFP_NOWARN); |
| 446 | if (!buffer) |
| 447 | return -ENOMEM; |
| 448 | |
| 449 | } |
| 450 | |
| 451 | rq = blk_get_request(q, in_len ? REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN, |
| 452 | __GFP_RECLAIM); |
| 453 | if (IS_ERR(rq)) { |
| 454 | err = PTR_ERR(rq); |
| 455 | goto error_free_buffer; |
| 456 | } |
| 457 | req = scsi_req(rq); |
| 458 | |
| 459 | cmdlen = COMMAND_SIZE(opcode); |
| 460 | |
| 461 | /* |
| 462 | * get command and data to send to device, if any |
| 463 | */ |
| 464 | err = -EFAULT; |
| 465 | req->cmd_len = cmdlen; |
| 466 | if (copy_from_user(req->cmd, sic->data, cmdlen)) |
| 467 | goto error; |
| 468 | |
| 469 | if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len)) |
| 470 | goto error; |
| 471 | |
| 472 | err = blk_verify_command(req->cmd, mode & FMODE_WRITE); |
| 473 | if (err) |
| 474 | goto error; |
| 475 | |
| 476 | /* default. possible overriden later */ |
| 477 | req->retries = 5; |
| 478 | |
| 479 | switch (opcode) { |
| 480 | case SEND_DIAGNOSTIC: |
| 481 | case FORMAT_UNIT: |
| 482 | rq->timeout = FORMAT_UNIT_TIMEOUT; |
| 483 | req->retries = 1; |
| 484 | break; |
| 485 | case START_STOP: |
| 486 | rq->timeout = START_STOP_TIMEOUT; |
| 487 | break; |
| 488 | case MOVE_MEDIUM: |
| 489 | rq->timeout = MOVE_MEDIUM_TIMEOUT; |
| 490 | break; |
| 491 | case READ_ELEMENT_STATUS: |
| 492 | rq->timeout = READ_ELEMENT_STATUS_TIMEOUT; |
| 493 | break; |
| 494 | case READ_DEFECT_DATA: |
| 495 | rq->timeout = READ_DEFECT_DATA_TIMEOUT; |
| 496 | req->retries = 1; |
| 497 | break; |
| 498 | default: |
| 499 | rq->timeout = BLK_DEFAULT_SG_TIMEOUT; |
| 500 | break; |
| 501 | } |
| 502 | |
| 503 | if (bytes && blk_rq_map_kern(q, rq, buffer, bytes, __GFP_RECLAIM)) { |
| 504 | err = DRIVER_ERROR << 24; |
| 505 | goto error; |
| 506 | } |
| 507 | |
| 508 | blk_execute_rq(q, disk, rq, 0); |
| 509 | |
| 510 | err = req->result & 0xff; /* only 8 bit SCSI status */ |
| 511 | if (err) { |
| 512 | if (req->sense_len && req->sense) { |
| 513 | bytes = (OMAX_SB_LEN > req->sense_len) ? |
| 514 | req->sense_len : OMAX_SB_LEN; |
| 515 | if (copy_to_user(sic->data, req->sense, bytes)) |
| 516 | err = -EFAULT; |
| 517 | } |
| 518 | } else { |
| 519 | if (copy_to_user(sic->data, buffer, out_len)) |
| 520 | err = -EFAULT; |
| 521 | } |
| 522 | |
| 523 | error: |
| 524 | blk_put_request(rq); |
| 525 | |
| 526 | error_free_buffer: |
| 527 | kfree(buffer); |
| 528 | |
| 529 | return err; |
| 530 | } |
| 531 | EXPORT_SYMBOL_GPL(sg_scsi_ioctl); |
| 532 | |
| 533 | /* Send basic block requests */ |
| 534 | static int __blk_send_generic(struct request_queue *q, struct gendisk *bd_disk, |
| 535 | int cmd, int data) |
| 536 | { |
| 537 | struct request *rq; |
| 538 | int err; |
| 539 | |
| 540 | rq = blk_get_request(q, REQ_OP_SCSI_OUT, __GFP_RECLAIM); |
| 541 | if (IS_ERR(rq)) |
| 542 | return PTR_ERR(rq); |
| 543 | rq->timeout = BLK_DEFAULT_SG_TIMEOUT; |
| 544 | scsi_req(rq)->cmd[0] = cmd; |
| 545 | scsi_req(rq)->cmd[4] = data; |
| 546 | scsi_req(rq)->cmd_len = 6; |
| 547 | blk_execute_rq(q, bd_disk, rq, 0); |
| 548 | err = scsi_req(rq)->result ? -EIO : 0; |
| 549 | blk_put_request(rq); |
| 550 | |
| 551 | return err; |
| 552 | } |
| 553 | |
| 554 | static inline int blk_send_start_stop(struct request_queue *q, |
| 555 | struct gendisk *bd_disk, int data) |
| 556 | { |
| 557 | return __blk_send_generic(q, bd_disk, GPCMD_START_STOP_UNIT, data); |
| 558 | } |
| 559 | |
| 560 | int scsi_cmd_ioctl(struct request_queue *q, struct gendisk *bd_disk, fmode_t mode, |
| 561 | unsigned int cmd, void __user *arg) |
| 562 | { |
| 563 | int err; |
| 564 | |
| 565 | if (!q) |
| 566 | return -ENXIO; |
| 567 | |
| 568 | switch (cmd) { |
| 569 | /* |
| 570 | * new sgv3 interface |
| 571 | */ |
| 572 | case SG_GET_VERSION_NUM: |
| 573 | err = sg_get_version(arg); |
| 574 | break; |
| 575 | case SCSI_IOCTL_GET_IDLUN: |
| 576 | err = scsi_get_idlun(q, arg); |
| 577 | break; |
| 578 | case SCSI_IOCTL_GET_BUS_NUMBER: |
| 579 | err = scsi_get_bus(q, arg); |
| 580 | break; |
| 581 | case SG_SET_TIMEOUT: |
| 582 | err = sg_set_timeout(q, arg); |
| 583 | break; |
| 584 | case SG_GET_TIMEOUT: |
| 585 | err = sg_get_timeout(q); |
| 586 | break; |
| 587 | case SG_GET_RESERVED_SIZE: |
| 588 | err = sg_get_reserved_size(q, arg); |
| 589 | break; |
| 590 | case SG_SET_RESERVED_SIZE: |
| 591 | err = sg_set_reserved_size(q, arg); |
| 592 | break; |
| 593 | case SG_EMULATED_HOST: |
| 594 | err = sg_emulated_host(q, arg); |
| 595 | break; |
| 596 | case SG_IO: { |
| 597 | struct sg_io_hdr hdr; |
| 598 | |
| 599 | err = -EFAULT; |
| 600 | if (copy_from_user(&hdr, arg, sizeof(hdr))) |
| 601 | break; |
| 602 | err = sg_io(q, bd_disk, &hdr, mode); |
| 603 | if (err == -EFAULT) |
| 604 | break; |
| 605 | |
| 606 | if (copy_to_user(arg, &hdr, sizeof(hdr))) |
| 607 | err = -EFAULT; |
| 608 | break; |
| 609 | } |
| 610 | case CDROM_SEND_PACKET: { |
| 611 | struct cdrom_generic_command cgc; |
| 612 | struct sg_io_hdr hdr; |
| 613 | |
| 614 | err = -EFAULT; |
| 615 | if (copy_from_user(&cgc, arg, sizeof(cgc))) |
| 616 | break; |
| 617 | cgc.timeout = clock_t_to_jiffies(cgc.timeout); |
| 618 | memset(&hdr, 0, sizeof(hdr)); |
| 619 | hdr.interface_id = 'S'; |
| 620 | hdr.cmd_len = sizeof(cgc.cmd); |
| 621 | hdr.dxfer_len = cgc.buflen; |
| 622 | err = 0; |
| 623 | switch (cgc.data_direction) { |
| 624 | case CGC_DATA_UNKNOWN: |
| 625 | hdr.dxfer_direction = SG_DXFER_UNKNOWN; |
| 626 | break; |
| 627 | case CGC_DATA_WRITE: |
| 628 | hdr.dxfer_direction = SG_DXFER_TO_DEV; |
| 629 | break; |
| 630 | case CGC_DATA_READ: |
| 631 | hdr.dxfer_direction = SG_DXFER_FROM_DEV; |
| 632 | break; |
| 633 | case CGC_DATA_NONE: |
| 634 | hdr.dxfer_direction = SG_DXFER_NONE; |
| 635 | break; |
| 636 | default: |
| 637 | err = -EINVAL; |
| 638 | } |
| 639 | if (err) |
| 640 | break; |
| 641 | |
| 642 | hdr.dxferp = cgc.buffer; |
| 643 | hdr.sbp = cgc.sense; |
| 644 | if (hdr.sbp) |
| 645 | hdr.mx_sb_len = sizeof(struct request_sense); |
| 646 | hdr.timeout = jiffies_to_msecs(cgc.timeout); |
| 647 | hdr.cmdp = ((struct cdrom_generic_command __user*) arg)->cmd; |
| 648 | hdr.cmd_len = sizeof(cgc.cmd); |
| 649 | |
| 650 | err = sg_io(q, bd_disk, &hdr, mode); |
| 651 | if (err == -EFAULT) |
| 652 | break; |
| 653 | |
| 654 | if (hdr.status) |
| 655 | err = -EIO; |
| 656 | |
| 657 | cgc.stat = err; |
| 658 | cgc.buflen = hdr.resid; |
| 659 | if (copy_to_user(arg, &cgc, sizeof(cgc))) |
| 660 | err = -EFAULT; |
| 661 | |
| 662 | break; |
| 663 | } |
| 664 | |
| 665 | /* |
| 666 | * old junk scsi send command ioctl |
| 667 | */ |
| 668 | case SCSI_IOCTL_SEND_COMMAND: |
| 669 | printk(KERN_WARNING "program %s is using a deprecated SCSI ioctl, please convert it to SG_IO\n", current->comm); |
| 670 | err = -EINVAL; |
| 671 | if (!arg) |
| 672 | break; |
| 673 | |
| 674 | err = sg_scsi_ioctl(q, bd_disk, mode, arg); |
| 675 | break; |
| 676 | case CDROMCLOSETRAY: |
| 677 | err = blk_send_start_stop(q, bd_disk, 0x03); |
| 678 | break; |
| 679 | case CDROMEJECT: |
| 680 | err = blk_send_start_stop(q, bd_disk, 0x02); |
| 681 | break; |
| 682 | default: |
| 683 | err = -ENOTTY; |
| 684 | } |
| 685 | |
| 686 | return err; |
| 687 | } |
| 688 | EXPORT_SYMBOL(scsi_cmd_ioctl); |
| 689 | |
| 690 | int scsi_verify_blk_ioctl(struct block_device *bd, unsigned int cmd) |
| 691 | { |
| 692 | if (bd && bd == bd->bd_contains) |
| 693 | return 0; |
| 694 | |
| 695 | /* Actually none of these is particularly useful on a partition, |
| 696 | * but they are safe. |
| 697 | */ |
| 698 | switch (cmd) { |
| 699 | case SCSI_IOCTL_GET_IDLUN: |
| 700 | case SCSI_IOCTL_GET_BUS_NUMBER: |
| 701 | case SCSI_IOCTL_GET_PCI: |
| 702 | case SCSI_IOCTL_PROBE_HOST: |
| 703 | case SG_GET_VERSION_NUM: |
| 704 | case SG_SET_TIMEOUT: |
| 705 | case SG_GET_TIMEOUT: |
| 706 | case SG_GET_RESERVED_SIZE: |
| 707 | case SG_SET_RESERVED_SIZE: |
| 708 | case SG_EMULATED_HOST: |
| 709 | case SCSI_IOCTL_SECURITY_PROTOCOL_IN: |
| 710 | case SCSI_IOCTL_SECURITY_PROTOCOL_OUT: |
| 711 | return 0; |
| 712 | case CDROM_GET_CAPABILITY: |
| 713 | /* Keep this until we remove the printk below. udev sends it |
| 714 | * and we do not want to spam dmesg about it. CD-ROMs do |
| 715 | * not have partitions, so we get here only for disks. |
| 716 | */ |
| 717 | return -ENOIOCTLCMD; |
| 718 | default: |
| 719 | break; |
| 720 | } |
| 721 | |
| 722 | if (capable(CAP_SYS_RAWIO)) |
| 723 | return 0; |
| 724 | |
| 725 | /* In particular, rule out all resets and host-specific ioctls. */ |
| 726 | printk_ratelimited(KERN_WARNING |
| 727 | "%s: sending ioctl %x to a partition!\n", current->comm, cmd); |
| 728 | |
| 729 | return -ENOIOCTLCMD; |
| 730 | } |
| 731 | EXPORT_SYMBOL(scsi_verify_blk_ioctl); |
| 732 | |
| 733 | int scsi_cmd_blk_ioctl(struct block_device *bd, fmode_t mode, |
| 734 | unsigned int cmd, void __user *arg) |
| 735 | { |
| 736 | int ret; |
| 737 | |
| 738 | ret = scsi_verify_blk_ioctl(bd, cmd); |
| 739 | if (ret < 0) |
| 740 | return ret; |
| 741 | |
| 742 | return scsi_cmd_ioctl(bd->bd_disk->queue, bd->bd_disk, mode, cmd, arg); |
| 743 | } |
| 744 | EXPORT_SYMBOL(scsi_cmd_blk_ioctl); |
| 745 | |
| 746 | /** |
| 747 | * scsi_req_init - initialize certain fields of a scsi_request structure |
| 748 | * @req: Pointer to a scsi_request structure. |
| 749 | * Initializes .__cmd[], .cmd, .cmd_len and .sense_len but no other members |
| 750 | * of struct scsi_request. |
| 751 | */ |
| 752 | void scsi_req_init(struct scsi_request *req) |
| 753 | { |
| 754 | memset(req->__cmd, 0, sizeof(req->__cmd)); |
| 755 | req->cmd = req->__cmd; |
| 756 | req->cmd_len = BLK_MAX_CDB; |
| 757 | req->sense_len = 0; |
| 758 | } |
| 759 | EXPORT_SYMBOL(scsi_req_init); |
| 760 | |
| 761 | static int __init blk_scsi_ioctl_init(void) |
| 762 | { |
| 763 | blk_set_cmd_filter_defaults(&blk_default_cmd_filter); |
| 764 | return 0; |
| 765 | } |
| 766 | fs_initcall(blk_scsi_ioctl_init); |