drivers/block/scsi_ioctl.c

   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/completion.h>
  25 #include <linux/cdrom.h>
  26 #include <linux/slab.h>
  27 #include <linux/times.h>
  28 #include <asm/uaccess.h>
  29
  30 #include <scsi/scsi.h>
  31 #include <scsi/scsi_ioctl.h>
  32 #include <scsi/scsi_cmnd.h>
  33
  34 /* Command group 3 is reserved and should never be used.  */
  35 const unsigned char scsi_command_size[8] =
  36 {
  37         6, 10, 10, 12,
  38         16, 12, 10, 10
  39 };
  40
  41 EXPORT_SYMBOL(scsi_command_size);
  42
  43 #define BLK_DEFAULT_TIMEOUT     (60 * HZ)
  44
  45 #include <scsi/sg.h>
  46
  47 static int sg_get_version(int __user *p)
  48 {
  49         static int sg_version_num = 30527;
  50         return put_user(sg_version_num, p);
  51 }
  52
  53 static int scsi_get_idlun(request_queue_t *q, int __user *p)
  54 {
  55         return put_user(0, p);
  56 }
  57
  58 static int scsi_get_bus(request_queue_t *q, int __user *p)
  59 {
  60         return put_user(0, p);
  61 }
  62
  63 static int sg_get_timeout(request_queue_t *q)
  64 {
  65         return q->sg_timeout / (HZ / USER_HZ);
  66 }
  67
  68 static int sg_set_timeout(request_queue_t *q, int __user *p)
  69 {
  70         int timeout, err = get_user(timeout, p);
  71
  72         if (!err)
  73                 q->sg_timeout = timeout * (HZ / USER_HZ);
  74
  75         return err;
  76 }
  77
  78 static int sg_get_reserved_size(request_queue_t *q, int __user *p)
  79 {
  80         return put_user(q->sg_reserved_size, p);
  81 }
  82
  83 static int sg_set_reserved_size(request_queue_t *q, int __user *p)
  84 {
  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  */
 103 static int sg_emulated_host(request_queue_t *q, int __user *p)
 104 {
 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
 114 static int verify_command(struct file *file, unsigned char *cmd)
 115 {
 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),
 126                 safe_for_read(READ_DEFECT_DATA),
 127                 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),
 171                 safe_for_write(ERASE),
 172                 safe_for_write(GPCMD_MODE_SELECT_10),
 173                 safe_for_write(MODE_SELECT),
 174                 safe_for_write(LOG_SELECT),
 175                 safe_for_write(GPCMD_BLANK),
 176                 safe_for_write(GPCMD_CLOSE_TRACK),
 177                 safe_for_write(GPCMD_FLUSH_CACHE),
 178                 safe_for_write(GPCMD_FORMAT_UNIT),
 179                 safe_for_write(GPCMD_REPAIR_RZONE_TRACK),
 180                 safe_for_write(GPCMD_RESERVE_RZONE_TRACK),
 181                 safe_for_write(GPCMD_SEND_DVD_STRUCTURE),
 182                 safe_for_write(GPCMD_SEND_EVENT),
 183                 safe_for_write(GPCMD_SEND_KEY),
 184                 safe_for_write(GPCMD_SEND_OPC),
 185                 safe_for_write(GPCMD_SEND_CUE_SHEET),
 186                 safe_for_write(GPCMD_SET_SPEED),
 187                 safe_for_write(GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL),
 188                 safe_for_write(GPCMD_LOAD_UNLOAD),
 189                 safe_for_write(GPCMD_SET_STREAMING),
 190         };
 191         unsigned char type = cmd_type[cmd[0]];
 192
 193         /* Anybody who can open the device can do a read-safe command */
 194         if (type & CMD_READ_SAFE)
 195                 return 0;
 196
 197         /* Write-safe commands just require a writable open.. */
 198         if (type & CMD_WRITE_SAFE) {
 199                 if (file->f_mode & FMODE_WRITE)
 200                         return 0;
 201         }
 202
 203         if (!type) {
 204                 cmd_type[cmd[0]] = CMD_WARNED;
 205                 printk(KERN_WARNING "scsi: unknown opcode 0x%02x\n", cmd[0]);
 206         }
 207
 208         /* And root can do any command.. */
 209         if (capable(CAP_SYS_RAWIO))
 210                 return 0;
 211
 212         /* Otherwise fail it with an "Operation not permitted" */
 213         return -EPERM;
 214 }
 215
 216 static int sg_io(struct file *file, request_queue_t *q,
 217                 struct gendisk *bd_disk, struct sg_io_hdr *hdr)
 218 {
 219         unsigned long start_time;
 220         int writing = 0, ret = 0;
 221         struct request *rq;
 222         struct bio *bio;
 223         char sense[SCSI_SENSE_BUFFERSIZE];
 224         unsigned char cmd[BLK_MAX_CDB];
 225
 226         if (hdr->interface_id != 'S')
 227                 return -EINVAL;
 228         if (hdr->cmd_len > BLK_MAX_CDB)
 229                 return -EINVAL;
 230         if (copy_from_user(cmd, hdr->cmdp, hdr->cmd_len))
 231                 return -EFAULT;
 232         if (verify_command(file, cmd))
 233                 return -EPERM;
 234
 235         if (hdr->dxfer_len > (q->max_sectors << 9))
 236                 return -EIO;
 237
 238         if (hdr->dxfer_len)
 239                 switch (hdr->dxfer_direction) {
 240                 default:
 241                         return -EINVAL;
 242                 case SG_DXFER_TO_FROM_DEV:
 243                 case SG_DXFER_TO_DEV:
 244                         writing = 1;
 245                         break;
 246                 case SG_DXFER_FROM_DEV:
 247                         break;
 248                 }
 249
 250         rq = blk_get_request(q, writing ? WRITE : READ, GFP_KERNEL);
 251         if (!rq)
 252                 return -ENOMEM;
 253
 254         if (hdr->iovec_count) {
 255                 const int size = sizeof(struct sg_iovec) * hdr->iovec_count;
 256                 struct sg_iovec *iov;
 257
 258                 iov = kmalloc(size, GFP_KERNEL);
 259                 if (!iov) {
 260                         ret = -ENOMEM;
 261                         goto out;
 262                 }
 263
 264                 if (copy_from_user(iov, hdr->dxferp, size)) {
 265                         kfree(iov);
 266                         ret = -EFAULT;
 267                         goto out;
 268                 }
 269
 270                 ret = blk_rq_map_user_iov(q, rq, iov, hdr->iovec_count);
 271                 kfree(iov);
 272         } else if (hdr->dxfer_len)
 273                 ret = blk_rq_map_user(q, rq, hdr->dxferp, hdr->dxfer_len);
 274
 275         if (ret)
 276                 goto out;
 277
 278         /*
 279          * fill in request structure
 280          */
 281         rq->cmd_len = hdr->cmd_len;
 282         memcpy(rq->cmd, cmd, hdr->cmd_len);
 283         if (sizeof(rq->cmd) != hdr->cmd_len)
 284                 memset(rq->cmd + hdr->cmd_len, 0, sizeof(rq->cmd) - hdr->cmd_len);
 285
 286         memset(sense, 0, sizeof(sense));
 287         rq->sense = sense;
 288         rq->sense_len = 0;
 289
 290         rq->flags |= REQ_BLOCK_PC;
 291         bio = rq->bio;
 292
 293         /*
 294          * bounce this after holding a reference to the original bio, it's
 295          * needed for proper unmapping
 296          */
 297         if (rq->bio)
 298                 blk_queue_bounce(q, &rq->bio);
 299
 300         rq->timeout = (hdr->timeout * HZ) / 1000;
 301         if (!rq->timeout)
 302                 rq->timeout = q->sg_timeout;
 303         if (!rq->timeout)
 304                 rq->timeout = BLK_DEFAULT_TIMEOUT;
 305
 306         start_time = jiffies;
 307
 308         /* ignore return value. All information is passed back to caller
 309          * (if he doesn't check that is his problem).
 310          * N.B. a non-zero SCSI status is _not_ necessarily an error.
 311          */
 312         blk_execute_rq(q, bd_disk, rq, 0);
 313
 314         /* write to all output members */
 315         hdr->status = 0xff & rq->errors;
 316         hdr->masked_status = status_byte(rq->errors);
 317         hdr->msg_status = msg_byte(rq->errors);
 318         hdr->host_status = host_byte(rq->errors);
 319         hdr->driver_status = driver_byte(rq->errors);
 320         hdr->info = 0;
 321         if (hdr->masked_status || hdr->host_status || hdr->driver_status)
 322                 hdr->info |= SG_INFO_CHECK;
 323         hdr->resid = rq->data_len;
 324         hdr->duration = ((jiffies - start_time) * 1000) / HZ;
 325         hdr->sb_len_wr = 0;
 326
 327         if (rq->sense_len && hdr->sbp) {
 328                 int len = min((unsigned int) hdr->mx_sb_len, rq->sense_len);
 329
 330                 if (!copy_to_user(hdr->sbp, rq->sense, len))
 331                         hdr->sb_len_wr = len;
 332         }
 333
 334         if (blk_rq_unmap_user(bio, hdr->dxfer_len))
 335                 ret = -EFAULT;
 336
 337         /* may not have succeeded, but output values written to control
 338          * structure (struct sg_io_hdr).  */
 339 out:
 340         blk_put_request(rq);
 341         return ret;
 342 }
 343
 344 #define OMAX_SB_LEN 16          /* For backward compatibility */
 345
 346 static int sg_scsi_ioctl(struct file *file, request_queue_t *q,
 347                          struct gendisk *bd_disk, Scsi_Ioctl_Command __user *sic)
 348 {
 349         struct request *rq;
 350         int err;
 351         unsigned int in_len, out_len, bytes, opcode, cmdlen;
 352         char *buffer = NULL, sense[SCSI_SENSE_BUFFERSIZE];
 353
 354         /*
 355          * get in an out lengths, verify they don't exceed a page worth of data
 356          */
 357         if (get_user(in_len, &sic->inlen))
 358                 return -EFAULT;
 359         if (get_user(out_len, &sic->outlen))
 360                 return -EFAULT;
 361         if (in_len > PAGE_SIZE || out_len > PAGE_SIZE)
 362                 return -EINVAL;
 363         if (get_user(opcode, sic->data))
 364                 return -EFAULT;
 365
 366         bytes = max(in_len, out_len);
 367         if (bytes) {
 368                 buffer = kmalloc(bytes, q->bounce_gfp | GFP_USER| __GFP_NOWARN);
 369                 if (!buffer)
 370                         return -ENOMEM;
 371
 372                 memset(buffer, 0, bytes);
 373         }
 374
 375         rq = blk_get_request(q, in_len ? WRITE : READ, __GFP_WAIT);
 376
 377         cmdlen = COMMAND_SIZE(opcode);
 378
 379         /*
 380          * get command and data to send to device, if any
 381          */
 382         err = -EFAULT;
 383         rq->cmd_len = cmdlen;
 384         if (copy_from_user(rq->cmd, sic->data, cmdlen))
 385                 goto error;
 386
 387         if (copy_from_user(buffer, sic->data + cmdlen, in_len))
 388                 goto error;
 389
 390         err = verify_command(file, rq->cmd);
 391         if (err)
 392                 goto error;
 393
 394         switch (opcode) {
 395                 case SEND_DIAGNOSTIC:
 396                 case FORMAT_UNIT:
 397                         rq->timeout = FORMAT_UNIT_TIMEOUT;
 398                         break;
 399                 case START_STOP:
 400                         rq->timeout = START_STOP_TIMEOUT;
 401                         break;
 402                 case MOVE_MEDIUM:
 403                         rq->timeout = MOVE_MEDIUM_TIMEOUT;
 404                         break;
 405                 case READ_ELEMENT_STATUS:
 406                         rq->timeout = READ_ELEMENT_STATUS_TIMEOUT;
 407                         break;
 408                 case READ_DEFECT_DATA:
 409                         rq->timeout = READ_DEFECT_DATA_TIMEOUT;
 410                         break;
 411                 default:
 412                         rq->timeout = BLK_DEFAULT_TIMEOUT;
 413                         break;
 414         }
 415
 416         memset(sense, 0, sizeof(sense));
 417         rq->sense = sense;
 418         rq->sense_len = 0;
 419
 420         rq->data = buffer;
 421         rq->data_len = bytes;
 422         rq->flags |= REQ_BLOCK_PC;
 423
 424         blk_execute_rq(q, bd_disk, rq, 0);
 425         err = rq->errors & 0xff;        /* only 8 bit SCSI status */
 426         if (err) {
 427                 if (rq->sense_len && rq->sense) {
 428                         bytes = (OMAX_SB_LEN > rq->sense_len) ?
 429                                 rq->sense_len : OMAX_SB_LEN;
 430                         if (copy_to_user(sic->data, rq->sense, bytes))
 431                                 err = -EFAULT;
 432                 }
 433         } else {
 434                 if (copy_to_user(sic->data, buffer, out_len))
 435                         err = -EFAULT;
 436         }
 437
 438 error:
 439         kfree(buffer);
 440         blk_put_request(rq);
 441         return err;
 442 }
 443
 444 int scsi_cmd_ioctl(struct file *file, struct gendisk *bd_disk, unsigned int cmd, void __user *arg)
 445 {
 446         request_queue_t *q;
 447         struct request *rq;
 448         int close = 0, err;
 449
 450         q = bd_disk->queue;
 451         if (!q)
 452                 return -ENXIO;
 453
 454         if (blk_get_queue(q))
 455                 return -ENXIO;
 456
 457         switch (cmd) {
 458                 /*
 459                  * new sgv3 interface
 460                  */
 461                 case SG_GET_VERSION_NUM:
 462                         err = sg_get_version(arg);
 463                         break;
 464                 case SCSI_IOCTL_GET_IDLUN:
 465                         err = scsi_get_idlun(q, arg);
 466                         break;
 467                 case SCSI_IOCTL_GET_BUS_NUMBER:
 468                         err = scsi_get_bus(q, arg);
 469                         break;
 470                 case SG_SET_TIMEOUT:
 471                         err = sg_set_timeout(q, arg);
 472                         break;
 473                 case SG_GET_TIMEOUT:
 474                         err = sg_get_timeout(q);
 475                         break;
 476                 case SG_GET_RESERVED_SIZE:
 477                         err = sg_get_reserved_size(q, arg);
 478                         break;
 479                 case SG_SET_RESERVED_SIZE:
 480                         err = sg_set_reserved_size(q, arg);
 481                         break;
 482                 case SG_EMULATED_HOST:
 483                         err = sg_emulated_host(q, arg);
 484                         break;
 485                 case SG_IO: {
 486                         struct sg_io_hdr hdr;
 487
 488                         err = -EFAULT;
 489                         if (copy_from_user(&hdr, arg, sizeof(hdr)))
 490                                 break;
 491                         err = sg_io(file, q, bd_disk, &hdr);
 492                         if (err == -EFAULT)
 493                                 break;
 494
 495                         if (copy_to_user(arg, &hdr, sizeof(hdr)))
 496                                 err = -EFAULT;
 497                         break;
 498                 }
 499                 case CDROM_SEND_PACKET: {
 500                         struct cdrom_generic_command cgc;
 501                         struct sg_io_hdr hdr;
 502
 503                         err = -EFAULT;
 504                         if (copy_from_user(&cgc, arg, sizeof(cgc)))
 505                                 break;
 506                         cgc.timeout = clock_t_to_jiffies(cgc.timeout);
 507                         memset(&hdr, 0, sizeof(hdr));
 508                         hdr.interface_id = 'S';
 509                         hdr.cmd_len = sizeof(cgc.cmd);
 510                         hdr.dxfer_len = cgc.buflen;
 511                         err = 0;
 512                         switch (cgc.data_direction) {
 513                                 case CGC_DATA_UNKNOWN:
 514                                         hdr.dxfer_direction = SG_DXFER_UNKNOWN;
 515                                         break;
 516                                 case CGC_DATA_WRITE:
 517                                         hdr.dxfer_direction = SG_DXFER_TO_DEV;
 518                                         break;
 519                                 case CGC_DATA_READ:
 520                                         hdr.dxfer_direction = SG_DXFER_FROM_DEV;
 521                                         break;
 522                                 case CGC_DATA_NONE:
 523                                         hdr.dxfer_direction = SG_DXFER_NONE;
 524                                         break;
 525                                 default:
 526                                         err = -EINVAL;
 527                         }
 528                         if (err)
 529                                 break;
 530
 531                         hdr.dxferp = cgc.buffer;
 532                         hdr.sbp = cgc.sense;
 533                         if (hdr.sbp)
 534                                 hdr.mx_sb_len = sizeof(struct request_sense);
 535                         hdr.timeout = cgc.timeout;
 536                         hdr.cmdp = ((struct cdrom_generic_command __user*) arg)->cmd;
 537                         hdr.cmd_len = sizeof(cgc.cmd);
 538
 539                         err = sg_io(file, q, bd_disk, &hdr);
 540                         if (err == -EFAULT)
 541                                 break;
 542
 543                         if (hdr.status)
 544                                 err = -EIO;
 545
 546                         cgc.stat = err;
 547                         cgc.buflen = hdr.resid;
 548                         if (copy_to_user(arg, &cgc, sizeof(cgc)))
 549                                 err = -EFAULT;
 550
 551                         break;
 552                 }
 553
 554                 /*
 555                  * old junk scsi send command ioctl
 556                  */
 557                 case SCSI_IOCTL_SEND_COMMAND:
 558                         printk(KERN_WARNING "program %s is using a deprecated SCSI ioctl, please convert it to SG_IO\n", current->comm);
 559                         err = -EINVAL;
 560                         if (!arg)
 561                                 break;
 562
 563                         err = sg_scsi_ioctl(file, q, bd_disk, arg);
 564                         break;
 565                 case CDROMCLOSETRAY:
 566                         close = 1;
 567                 case CDROMEJECT:
 568                         rq = blk_get_request(q, WRITE, __GFP_WAIT);
 569                         rq->flags |= REQ_BLOCK_PC;
 570                         rq->data = NULL;
 571                         rq->data_len = 0;
 572                         rq->timeout = BLK_DEFAULT_TIMEOUT;
 573                         memset(rq->cmd, 0, sizeof(rq->cmd));
 574                         rq->cmd[0] = GPCMD_START_STOP_UNIT;
 575                         rq->cmd[4] = 0x02 + (close != 0);
 576                         rq->cmd_len = 6;
 577                         err = blk_execute_rq(q, bd_disk, rq, 0);
 578                         blk_put_request(rq);
 579                         break;
 580                 default:
 581                         err = -ENOTTY;
 582         }
 583
 584         blk_put_queue(q);
 585         return err;
 586 }
 587
 588 EXPORT_SYMBOL(scsi_cmd_ioctl);