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 safe_for_read(cmd)      [cmd] = CMD_READ_SAFE
 111 #define safe_for_write(cmd)     [cmd] = CMD_WRITE_SAFE
 112
 113 static int verify_command(struct file *file, unsigned char *cmd)
 114 {
 115         static const unsigned char cmd_type[256] = {
 116
 117                 /* Basic read-only commands */
 118                 safe_for_read(TEST_UNIT_READY),
 119                 safe_for_read(REQUEST_SENSE),
 120                 safe_for_read(READ_6),
 121                 safe_for_read(READ_10),
 122                 safe_for_read(READ_12),
 123                 safe_for_read(READ_16),
 124                 safe_for_read(READ_BUFFER),
 125                 safe_for_read(READ_LONG),
 126                 safe_for_read(INQUIRY),
 127                 safe_for_read(MODE_SENSE),
 128                 safe_for_read(MODE_SENSE_10),
 129                 safe_for_read(START_STOP),
 130                 safe_for_read(GPCMD_VERIFY_10),
 131                 safe_for_read(VERIFY_16),
 132                 safe_for_read(READ_BUFFER),
 133
 134                 /* Audio CD commands */
 135                 safe_for_read(GPCMD_PLAY_CD),
 136                 safe_for_read(GPCMD_PLAY_AUDIO_10),
 137                 safe_for_read(GPCMD_PLAY_AUDIO_MSF),
 138                 safe_for_read(GPCMD_PLAY_AUDIO_TI),
 139                 safe_for_read(GPCMD_PAUSE_RESUME),
 140
 141                 /* CD/DVD data reading */
 142                 safe_for_read(GPCMD_READ_CD),
 143                 safe_for_read(GPCMD_READ_CD_MSF),
 144                 safe_for_read(GPCMD_READ_DISC_INFO),
 145                 safe_for_read(GPCMD_READ_CDVD_CAPACITY),
 146                 safe_for_read(GPCMD_READ_DVD_STRUCTURE),
 147                 safe_for_read(GPCMD_READ_HEADER),
 148                 safe_for_read(GPCMD_READ_TRACK_RZONE_INFO),
 149                 safe_for_read(GPCMD_READ_SUBCHANNEL),
 150                 safe_for_read(GPCMD_READ_TOC_PMA_ATIP),
 151                 safe_for_read(GPCMD_REPORT_KEY),
 152                 safe_for_read(GPCMD_SCAN),
 153                 safe_for_read(GPCMD_GET_CONFIGURATION),
 154                 safe_for_read(GPCMD_READ_FORMAT_CAPACITIES),
 155                 safe_for_read(GPCMD_GET_EVENT_STATUS_NOTIFICATION),
 156                 safe_for_read(GPCMD_GET_PERFORMANCE),
 157                 safe_for_read(GPCMD_SEEK),
 158                 safe_for_read(GPCMD_STOP_PLAY_SCAN),
 159
 160                 /* Basic writing commands */
 161                 safe_for_write(WRITE_6),
 162                 safe_for_write(WRITE_10),
 163                 safe_for_write(WRITE_VERIFY),
 164                 safe_for_write(WRITE_12),
 165                 safe_for_write(WRITE_VERIFY_12),
 166                 safe_for_write(WRITE_16),
 167                 safe_for_write(WRITE_LONG),
 168                 safe_for_write(ERASE),
 169                 safe_for_write(GPCMD_MODE_SELECT_10),
 170                 safe_for_write(MODE_SELECT),
 171                 safe_for_write(GPCMD_BLANK),
 172                 safe_for_write(GPCMD_CLOSE_TRACK),
 173                 safe_for_write(GPCMD_FLUSH_CACHE),
 174                 safe_for_write(GPCMD_FORMAT_UNIT),
 175                 safe_for_write(GPCMD_REPAIR_RZONE_TRACK),
 176                 safe_for_write(GPCMD_RESERVE_RZONE_TRACK),
 177                 safe_for_write(GPCMD_SEND_DVD_STRUCTURE),
 178                 safe_for_write(GPCMD_SEND_EVENT),
 179                 safe_for_write(GPCMD_SEND_KEY),
 180                 safe_for_write(GPCMD_SEND_OPC),
 181                 safe_for_write(GPCMD_SEND_CUE_SHEET),
 182                 safe_for_write(GPCMD_SET_SPEED),
 183                 safe_for_write(GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL),
 184                 safe_for_write(GPCMD_LOAD_UNLOAD),
 185                 safe_for_write(GPCMD_SET_STREAMING),
 186         };
 187         unsigned char type = cmd_type[cmd[0]];
 188
 189         /* Anybody who can open the device can do a read-safe command */
 190         if (type & CMD_READ_SAFE)
 191                 return 0;
 192
 193         /* Write-safe commands just require a writable open.. */
 194         if (type & CMD_WRITE_SAFE) {
 195                 if (file->f_mode & FMODE_WRITE)
 196                         return 0;
 197         }
 198
 199         /* And root can do any command.. */
 200         if (capable(CAP_SYS_RAWIO))
 201                 return 0;
 202
 203         /* Otherwise fail it with an "Operation not permitted" */
 204         return -EPERM;
 205 }
 206
 207 static int sg_io(struct file *file, request_queue_t *q,
 208                 struct gendisk *bd_disk, struct sg_io_hdr *hdr)
 209 {
 210         unsigned long start_time;
 211         int reading, writing;
 212         struct request *rq;
 213         struct bio *bio;
 214         char sense[SCSI_SENSE_BUFFERSIZE];
 215         unsigned char cmd[BLK_MAX_CDB];
 216
 217         if (hdr->interface_id != 'S')
 218                 return -EINVAL;
 219         if (hdr->cmd_len > BLK_MAX_CDB)
 220                 return -EINVAL;
 221         if (copy_from_user(cmd, hdr->cmdp, hdr->cmd_len))
 222                 return -EFAULT;
 223         if (verify_command(file, cmd))
 224                 return -EPERM;
 225
 226         /*
 227          * we'll do that later
 228          */
 229         if (hdr->iovec_count)
 230                 return -EOPNOTSUPP;
 231
 232         if (hdr->dxfer_len > (q->max_sectors << 9))
 233                 return -EIO;
 234
 235         reading = writing = 0;
 236         if (hdr->dxfer_len) {
 237                 switch (hdr->dxfer_direction) {
 238                 default:
 239                         return -EINVAL;
 240                 case SG_DXFER_TO_FROM_DEV:
 241                         reading = 1;
 242                         /* fall through */
 243                 case SG_DXFER_TO_DEV:
 244                         writing = 1;
 245                         break;
 246                 case SG_DXFER_FROM_DEV:
 247                         reading = 1;
 248                         break;
 249                 }
 250
 251                 rq = blk_rq_map_user(q, writing ? WRITE : READ, hdr->dxferp,
 252                                      hdr->dxfer_len);
 253
 254                 if (IS_ERR(rq))
 255                         return PTR_ERR(rq);
 256         } else
 257                 rq = blk_get_request(q, READ, __GFP_WAIT);
 258
 259         /*
 260          * fill in request structure
 261          */
 262         rq->cmd_len = hdr->cmd_len;
 263         memcpy(rq->cmd, cmd, hdr->cmd_len);
 264         if (sizeof(rq->cmd) != hdr->cmd_len)
 265                 memset(rq->cmd + hdr->cmd_len, 0, sizeof(rq->cmd) - hdr->cmd_len);
 266
 267         memset(sense, 0, sizeof(sense));
 268         rq->sense = sense;
 269         rq->sense_len = 0;
 270
 271         rq->flags |= REQ_BLOCK_PC;
 272         bio = rq->bio;
 273
 274         /*
 275          * bounce this after holding a reference to the original bio, it's
 276          * needed for proper unmapping
 277          */
 278         if (rq->bio)
 279                 blk_queue_bounce(q, &rq->bio);
 280
 281         rq->timeout = (hdr->timeout * HZ) / 1000;
 282         if (!rq->timeout)
 283                 rq->timeout = q->sg_timeout;
 284         if (!rq->timeout)
 285                 rq->timeout = BLK_DEFAULT_TIMEOUT;
 286
 287         start_time = jiffies;
 288
 289         /* ignore return value. All information is passed back to caller
 290          * (if he doesn't check that is his problem).
 291          * N.B. a non-zero SCSI status is _not_ necessarily an error.
 292          */
 293         blk_execute_rq(q, bd_disk, rq);
 294
 295         /* write to all output members */
 296         hdr->status = rq->errors;
 297         hdr->masked_status = (hdr->status >> 1) & 0x1f;
 298         hdr->msg_status = 0;
 299         hdr->host_status = 0;
 300         hdr->driver_status = 0;
 301         hdr->info = 0;
 302         if (hdr->masked_status || hdr->host_status || hdr->driver_status)
 303                 hdr->info |= SG_INFO_CHECK;
 304         hdr->resid = rq->data_len;
 305         hdr->duration = ((jiffies - start_time) * 1000) / HZ;
 306         hdr->sb_len_wr = 0;
 307
 308         if (rq->sense_len && hdr->sbp) {
 309                 int len = min((unsigned int) hdr->mx_sb_len, rq->sense_len);
 310
 311                 if (!copy_to_user(hdr->sbp, rq->sense, len))
 312                         hdr->sb_len_wr = len;
 313         }
 314
 315         if (blk_rq_unmap_user(rq, bio, hdr->dxfer_len))
 316                 return -EFAULT;
 317
 318         /* may not have succeeded, but output values written to control
 319          * structure (struct sg_io_hdr).  */
 320         return 0;
 321 }
 322
 323 #define FORMAT_UNIT_TIMEOUT             (2 * 60 * 60 * HZ)
 324 #define START_STOP_TIMEOUT              (60 * HZ)
 325 #define MOVE_MEDIUM_TIMEOUT             (5 * 60 * HZ)
 326 #define READ_ELEMENT_STATUS_TIMEOUT     (5 * 60 * HZ)
 327 #define READ_DEFECT_DATA_TIMEOUT        (60 * HZ )
 328 #define OMAX_SB_LEN 16          /* For backward compatibility */
 329
 330 static int sg_scsi_ioctl(struct file *file, request_queue_t *q,
 331                          struct gendisk *bd_disk, Scsi_Ioctl_Command __user *sic)
 332 {
 333         struct request *rq;
 334         int err, in_len, out_len, bytes, opcode, cmdlen;
 335         char *buffer = NULL, sense[SCSI_SENSE_BUFFERSIZE];
 336
 337         /*
 338          * get in an out lengths, verify they don't exceed a page worth of data
 339          */
 340         if (get_user(in_len, &sic->inlen))
 341                 return -EFAULT;
 342         if (get_user(out_len, &sic->outlen))
 343                 return -EFAULT;
 344         if (in_len > PAGE_SIZE || out_len > PAGE_SIZE)
 345                 return -EINVAL;
 346         if (get_user(opcode, sic->data))
 347                 return -EFAULT;
 348
 349         bytes = max(in_len, out_len);
 350         if (bytes) {
 351                 buffer = kmalloc(bytes, q->bounce_gfp | GFP_USER);
 352                 if (!buffer)
 353                         return -ENOMEM;
 354
 355                 memset(buffer, 0, bytes);
 356         }
 357
 358         rq = blk_get_request(q, in_len ? WRITE : READ, __GFP_WAIT);
 359
 360         cmdlen = COMMAND_SIZE(opcode);
 361
 362         /*
 363          * get command and data to send to device, if any
 364          */
 365         err = -EFAULT;
 366         rq->cmd_len = cmdlen;
 367         if (copy_from_user(rq->cmd, sic->data, cmdlen))
 368                 goto error;
 369
 370         if (copy_from_user(buffer, sic->data + cmdlen, in_len))
 371                 goto error;
 372
 373         err = verify_command(file, rq->cmd);
 374         if (err)
 375                 goto error;
 376
 377         switch (opcode) {
 378                 case SEND_DIAGNOSTIC:
 379                 case FORMAT_UNIT:
 380                         rq->timeout = FORMAT_UNIT_TIMEOUT;
 381                         break;
 382                 case START_STOP:
 383                         rq->timeout = START_STOP_TIMEOUT;
 384                         break;
 385                 case MOVE_MEDIUM:
 386                         rq->timeout = MOVE_MEDIUM_TIMEOUT;
 387                         break;
 388                 case READ_ELEMENT_STATUS:
 389                         rq->timeout = READ_ELEMENT_STATUS_TIMEOUT;
 390                         break;
 391                 case READ_DEFECT_DATA:
 392                         rq->timeout = READ_DEFECT_DATA_TIMEOUT;
 393                         break;
 394                 default:
 395                         rq->timeout = BLK_DEFAULT_TIMEOUT;
 396                         break;
 397         }
 398
 399         memset(sense, 0, sizeof(sense));
 400         rq->sense = sense;
 401         rq->sense_len = 0;
 402
 403         rq->data = buffer;
 404         rq->data_len = bytes;
 405         rq->flags |= REQ_BLOCK_PC;
 406
 407         blk_execute_rq(q, bd_disk, rq);
 408         err = rq->errors & 0xff;        /* only 8 bit SCSI status */
 409         if (err) {
 410                 if (rq->sense_len && rq->sense) {
 411                         bytes = (OMAX_SB_LEN > rq->sense_len) ?
 412                                 rq->sense_len : OMAX_SB_LEN;
 413                         if (copy_to_user(sic->data, rq->sense, bytes))
 414                                 err = -EFAULT;
 415                 }
 416         } else {
 417                 if (copy_to_user(sic->data, buffer, out_len))
 418                         err = -EFAULT;
 419         }
 420
 421 error:
 422         kfree(buffer);
 423         blk_put_request(rq);
 424         return err;
 425 }
 426
 427 int scsi_cmd_ioctl(struct file *file, struct gendisk *bd_disk, unsigned int cmd, void __user *arg)
 428 {
 429         request_queue_t *q;
 430         struct request *rq;
 431         int close = 0, err;
 432
 433         q = bd_disk->queue;
 434         if (!q)
 435                 return -ENXIO;
 436
 437         if (blk_get_queue(q))
 438                 return -ENXIO;
 439
 440         switch (cmd) {
 441                 /*
 442                  * new sgv3 interface
 443                  */
 444                 case SG_GET_VERSION_NUM:
 445                         err = sg_get_version(arg);
 446                         break;
 447                 case SCSI_IOCTL_GET_IDLUN:
 448                         err = scsi_get_idlun(q, arg);
 449                         break;
 450                 case SCSI_IOCTL_GET_BUS_NUMBER:
 451                         err = scsi_get_bus(q, arg);
 452                         break;
 453                 case SG_SET_TIMEOUT:
 454                         err = sg_set_timeout(q, arg);
 455                         break;
 456                 case SG_GET_TIMEOUT:
 457                         err = sg_get_timeout(q);
 458                         break;
 459                 case SG_GET_RESERVED_SIZE:
 460                         err = sg_get_reserved_size(q, arg);
 461                         break;
 462                 case SG_SET_RESERVED_SIZE:
 463                         err = sg_set_reserved_size(q, arg);
 464                         break;
 465                 case SG_EMULATED_HOST:
 466                         err = sg_emulated_host(q, arg);
 467                         break;
 468                 case SG_IO: {
 469                         struct sg_io_hdr hdr;
 470
 471                         err = -EFAULT;
 472                         if (copy_from_user(&hdr, arg, sizeof(hdr)))
 473                                 break;
 474                         err = sg_io(file, q, bd_disk, &hdr);
 475                         if (err == -EFAULT)
 476                                 break;
 477
 478                         if (copy_to_user(arg, &hdr, sizeof(hdr)))
 479                                 err = -EFAULT;
 480                         break;
 481                 }
 482                 case CDROM_SEND_PACKET: {
 483                         struct cdrom_generic_command cgc;
 484                         struct sg_io_hdr hdr;
 485
 486                         err = -EFAULT;
 487                         if (copy_from_user(&cgc, arg, sizeof(cgc)))
 488                                 break;
 489                         cgc.timeout = clock_t_to_jiffies(cgc.timeout);
 490                         memset(&hdr, 0, sizeof(hdr));
 491                         hdr.interface_id = 'S';
 492                         hdr.cmd_len = sizeof(cgc.cmd);
 493                         hdr.dxfer_len = cgc.buflen;
 494                         err = 0;
 495                         switch (cgc.data_direction) {
 496                                 case CGC_DATA_UNKNOWN:
 497                                         hdr.dxfer_direction = SG_DXFER_UNKNOWN;
 498                                         break;
 499                                 case CGC_DATA_WRITE:
 500                                         hdr.dxfer_direction = SG_DXFER_TO_DEV;
 501                                         break;
 502                                 case CGC_DATA_READ:
 503                                         hdr.dxfer_direction = SG_DXFER_FROM_DEV;
 504                                         break;
 505                                 case CGC_DATA_NONE:
 506                                         hdr.dxfer_direction = SG_DXFER_NONE;
 507                                         break;
 508                                 default:
 509                                         err = -EINVAL;
 510                         }
 511                         if (err)
 512                                 break;
 513
 514                         hdr.dxferp = cgc.buffer;
 515                         hdr.sbp = cgc.sense;
 516                         if (hdr.sbp)
 517                                 hdr.mx_sb_len = sizeof(struct request_sense);
 518                         hdr.timeout = cgc.timeout;
 519                         hdr.cmdp = ((struct cdrom_generic_command __user*) arg)->cmd;
 520                         hdr.cmd_len = sizeof(cgc.cmd);
 521
 522                         err = sg_io(file, q, bd_disk, &hdr);
 523                         if (err == -EFAULT)
 524                                 break;
 525
 526                         if (hdr.status)
 527                                 err = -EIO;
 528
 529                         cgc.stat = err;
 530                         cgc.buflen = hdr.resid;
 531                         if (copy_to_user(arg, &cgc, sizeof(cgc)))
 532                                 err = -EFAULT;
 533
 534                         break;
 535                 }
 536
 537                 /*
 538                  * old junk scsi send command ioctl
 539                  */
 540                 case SCSI_IOCTL_SEND_COMMAND:
 541                         printk(KERN_WARNING "program %s is using a deprecated SCSI ioctl, please convert it to SG_IO\n", current->comm);
 542                         err = -EINVAL;
 543                         if (!arg)
 544                                 break;
 545
 546                         err = sg_scsi_ioctl(file, q, bd_disk, arg);
 547                         break;
 548                 case CDROMCLOSETRAY:
 549                         close = 1;
 550                 case CDROMEJECT:
 551                         rq = blk_get_request(q, WRITE, __GFP_WAIT);
 552                         rq->flags |= REQ_BLOCK_PC;
 553                         rq->data = NULL;
 554                         rq->data_len = 0;
 555                         rq->timeout = BLK_DEFAULT_TIMEOUT;
 556                         memset(rq->cmd, 0, sizeof(rq->cmd));
 557                         rq->cmd[0] = GPCMD_START_STOP_UNIT;
 558                         rq->cmd[4] = 0x02 + (close != 0);
 559                         rq->cmd_len = 6;
 560                         err = blk_execute_rq(q, bd_disk, rq);
 561                         blk_put_request(rq);
 562                         break;
 563                 default:
 564                         err = -ENOTTY;
 565         }
 566
 567         blk_put_queue(q);
 568         return err;
 569 }
 570
 571 EXPORT_SYMBOL(scsi_cmd_ioctl);