1 /* 2 * sd.c Copyright (C) 1992 Drew Eckhardt 3 * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale 4 * 5 * Linux scsi disk driver 6 * Initial versions: Drew Eckhardt 7 * Subsequent revisions: Eric Youngdale 8 * Modification history: 9 * - Drew Eckhardt <drew@colorado.edu> original 10 * - Eric Youngdale <eric@andante.org> add scatter-gather, multiple 11 * outstanding request, and other enhancements. 12 * Support loadable low-level scsi drivers. 13 * - Jirka Hanika <geo@ff.cuni.cz> support more scsi disks using 14 * eight major numbers. 15 * - Richard Gooch <rgooch@atnf.csiro.au> support devfs. 16 * - Torben Mathiasen <tmm@image.dk> Resource allocation fixes in 17 * sd_init and cleanups. 18 * - Alex Davis <letmein@erols.com> Fix problem where partition info 19 * not being read in sd_open. Fix problem where removable media 20 * could be ejected after sd_open. 21 * - Douglas Gilbert <dgilbert@interlog.com> cleanup for lk 2.5.x 22 * - Badari Pulavarty <pbadari@us.ibm.com>, Matthew Wilcox 23 * <willy@debian.org>, Kurt Garloff <garloff@suse.de>: 24 * Support 32k/1M disks. 25 * 26 * Logging policy (needs CONFIG_SCSI_LOGGING defined): 27 * - setting up transfer: SCSI_LOG_HLQUEUE levels 1 and 2 28 * - end of transfer (bh + scsi_lib): SCSI_LOG_HLCOMPLETE level 1 29 * - entering sd_ioctl: SCSI_LOG_IOCTL level 1 30 * - entering other commands: SCSI_LOG_HLQUEUE level 3 31 * Note: when the logging level is set by the user, it must be greater 32 * than the level indicated above to trigger output. 33 */ 34 35 #include <linux/module.h> 36 #include <linux/fs.h> 37 #include <linux/kernel.h> 38 #include <linux/mm.h> 39 #include <linux/bio.h> 40 #include <linux/genhd.h> 41 #include <linux/hdreg.h> 42 #include <linux/errno.h> 43 #include <linux/idr.h> 44 #include <linux/interrupt.h> 45 #include <linux/init.h> 46 #include <linux/blkdev.h> 47 #include <linux/blkpg.h> 48 #include <linux/delay.h> 49 #include <linux/mutex.h> 50 #include <asm/uaccess.h> 51 52 #include <scsi/scsi.h> 53 #include <scsi/scsi_cmnd.h> 54 #include <scsi/scsi_dbg.h> 55 #include <scsi/scsi_device.h> 56 #include <scsi/scsi_driver.h> 57 #include <scsi/scsi_eh.h> 58 #include <scsi/scsi_host.h> 59 #include <scsi/scsi_ioctl.h> 60 #include <scsi/scsicam.h> 61 #include <scsi/sd.h> 62 63 #include "scsi_logging.h" 64 65 MODULE_AUTHOR("Eric Youngdale"); 66 MODULE_DESCRIPTION("SCSI disk (sd) driver"); 67 MODULE_LICENSE("GPL"); 68 69 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR); 70 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR); 71 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR); 72 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR); 73 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR); 74 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR); 75 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR); 76 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR); 77 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR); 78 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR); 79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR); 80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR); 81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR); 82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR); 83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR); 84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR); 85 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK); 86 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD); 87 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC); 88 89 static DEFINE_IDR(sd_index_idr); 90 static DEFINE_SPINLOCK(sd_index_lock); 91 92 /* This semaphore is used to mediate the 0->1 reference get in the 93 * face of object destruction (i.e. we can't allow a get on an 94 * object after last put) */ 95 static DEFINE_MUTEX(sd_ref_mutex); 96 97 static const char *sd_cache_types[] = { 98 "write through", "none", "write back", 99 "write back, no read (daft)" 100 }; 101 102 static ssize_t sd_store_cache_type(struct class_device *cdev, const char *buf, 103 size_t count) 104 { 105 int i, ct = -1, rcd, wce, sp; 106 struct scsi_disk *sdkp = to_scsi_disk(cdev); 107 struct scsi_device *sdp = sdkp->device; 108 char buffer[64]; 109 char *buffer_data; 110 struct scsi_mode_data data; 111 struct scsi_sense_hdr sshdr; 112 int len; 113 114 if (sdp->type != TYPE_DISK) 115 /* no cache control on RBC devices; theoretically they 116 * can do it, but there's probably so many exceptions 117 * it's not worth the risk */ 118 return -EINVAL; 119 120 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) { 121 const int len = strlen(sd_cache_types[i]); 122 if (strncmp(sd_cache_types[i], buf, len) == 0 && 123 buf[len] == '\n') { 124 ct = i; 125 break; 126 } 127 } 128 if (ct < 0) 129 return -EINVAL; 130 rcd = ct & 0x01 ? 1 : 0; 131 wce = ct & 0x02 ? 1 : 0; 132 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT, 133 SD_MAX_RETRIES, &data, NULL)) 134 return -EINVAL; 135 len = min_t(size_t, sizeof(buffer), data.length - data.header_length - 136 data.block_descriptor_length); 137 buffer_data = buffer + data.header_length + 138 data.block_descriptor_length; 139 buffer_data[2] &= ~0x05; 140 buffer_data[2] |= wce << 2 | rcd; 141 sp = buffer_data[0] & 0x80 ? 1 : 0; 142 143 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT, 144 SD_MAX_RETRIES, &data, &sshdr)) { 145 if (scsi_sense_valid(&sshdr)) 146 sd_print_sense_hdr(sdkp, &sshdr); 147 return -EINVAL; 148 } 149 sd_revalidate_disk(sdkp->disk); 150 return count; 151 } 152 153 static ssize_t sd_store_manage_start_stop(struct class_device *cdev, 154 const char *buf, size_t count) 155 { 156 struct scsi_disk *sdkp = to_scsi_disk(cdev); 157 struct scsi_device *sdp = sdkp->device; 158 159 if (!capable(CAP_SYS_ADMIN)) 160 return -EACCES; 161 162 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10); 163 164 return count; 165 } 166 167 static ssize_t sd_store_allow_restart(struct class_device *cdev, const char *buf, 168 size_t count) 169 { 170 struct scsi_disk *sdkp = to_scsi_disk(cdev); 171 struct scsi_device *sdp = sdkp->device; 172 173 if (!capable(CAP_SYS_ADMIN)) 174 return -EACCES; 175 176 if (sdp->type != TYPE_DISK) 177 return -EINVAL; 178 179 sdp->allow_restart = simple_strtoul(buf, NULL, 10); 180 181 return count; 182 } 183 184 static ssize_t sd_show_cache_type(struct class_device *cdev, char *buf) 185 { 186 struct scsi_disk *sdkp = to_scsi_disk(cdev); 187 int ct = sdkp->RCD + 2*sdkp->WCE; 188 189 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]); 190 } 191 192 static ssize_t sd_show_fua(struct class_device *cdev, char *buf) 193 { 194 struct scsi_disk *sdkp = to_scsi_disk(cdev); 195 196 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA); 197 } 198 199 static ssize_t sd_show_manage_start_stop(struct class_device *cdev, char *buf) 200 { 201 struct scsi_disk *sdkp = to_scsi_disk(cdev); 202 struct scsi_device *sdp = sdkp->device; 203 204 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop); 205 } 206 207 static ssize_t sd_show_allow_restart(struct class_device *cdev, char *buf) 208 { 209 struct scsi_disk *sdkp = to_scsi_disk(cdev); 210 211 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart); 212 } 213 214 static struct class_device_attribute sd_disk_attrs[] = { 215 __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type, 216 sd_store_cache_type), 217 __ATTR(FUA, S_IRUGO, sd_show_fua, NULL), 218 __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart, 219 sd_store_allow_restart), 220 __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop, 221 sd_store_manage_start_stop), 222 __ATTR_NULL, 223 }; 224 225 static struct class sd_disk_class = { 226 .name = "scsi_disk", 227 .owner = THIS_MODULE, 228 .release = scsi_disk_release, 229 .class_dev_attrs = sd_disk_attrs, 230 }; 231 232 static struct scsi_driver sd_template = { 233 .owner = THIS_MODULE, 234 .gendrv = { 235 .name = "sd", 236 .probe = sd_probe, 237 .remove = sd_remove, 238 .suspend = sd_suspend, 239 .resume = sd_resume, 240 .shutdown = sd_shutdown, 241 }, 242 .rescan = sd_rescan, 243 .init_command = sd_init_command, 244 .issue_flush = sd_issue_flush, 245 }; 246 247 /* 248 * Device no to disk mapping: 249 * 250 * major disc2 disc p1 251 * |............|.............|....|....| <- dev_t 252 * 31 20 19 8 7 4 3 0 253 * 254 * Inside a major, we have 16k disks, however mapped non- 255 * contiguously. The first 16 disks are for major0, the next 256 * ones with major1, ... Disk 256 is for major0 again, disk 272 257 * for major1, ... 258 * As we stay compatible with our numbering scheme, we can reuse 259 * the well-know SCSI majors 8, 65--71, 136--143. 260 */ 261 static int sd_major(int major_idx) 262 { 263 switch (major_idx) { 264 case 0: 265 return SCSI_DISK0_MAJOR; 266 case 1 ... 7: 267 return SCSI_DISK1_MAJOR + major_idx - 1; 268 case 8 ... 15: 269 return SCSI_DISK8_MAJOR + major_idx - 8; 270 default: 271 BUG(); 272 return 0; /* shut up gcc */ 273 } 274 } 275 276 static inline struct scsi_disk *scsi_disk(struct gendisk *disk) 277 { 278 return container_of(disk->private_data, struct scsi_disk, driver); 279 } 280 281 static struct scsi_disk *__scsi_disk_get(struct gendisk *disk) 282 { 283 struct scsi_disk *sdkp = NULL; 284 285 if (disk->private_data) { 286 sdkp = scsi_disk(disk); 287 if (scsi_device_get(sdkp->device) == 0) 288 class_device_get(&sdkp->cdev); 289 else 290 sdkp = NULL; 291 } 292 return sdkp; 293 } 294 295 static struct scsi_disk *scsi_disk_get(struct gendisk *disk) 296 { 297 struct scsi_disk *sdkp; 298 299 mutex_lock(&sd_ref_mutex); 300 sdkp = __scsi_disk_get(disk); 301 mutex_unlock(&sd_ref_mutex); 302 return sdkp; 303 } 304 305 static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev) 306 { 307 struct scsi_disk *sdkp; 308 309 mutex_lock(&sd_ref_mutex); 310 sdkp = dev_get_drvdata(dev); 311 if (sdkp) 312 sdkp = __scsi_disk_get(sdkp->disk); 313 mutex_unlock(&sd_ref_mutex); 314 return sdkp; 315 } 316 317 static void scsi_disk_put(struct scsi_disk *sdkp) 318 { 319 struct scsi_device *sdev = sdkp->device; 320 321 mutex_lock(&sd_ref_mutex); 322 class_device_put(&sdkp->cdev); 323 scsi_device_put(sdev); 324 mutex_unlock(&sd_ref_mutex); 325 } 326 327 /** 328 * sd_init_command - build a scsi (read or write) command from 329 * information in the request structure. 330 * @SCpnt: pointer to mid-level's per scsi command structure that 331 * contains request and into which the scsi command is written 332 * 333 * Returns 1 if successful and 0 if error (or cannot be done now). 334 **/ 335 static int sd_init_command(struct scsi_cmnd * SCpnt) 336 { 337 struct scsi_device *sdp = SCpnt->device; 338 struct request *rq = SCpnt->request; 339 struct gendisk *disk = rq->rq_disk; 340 sector_t block = rq->sector; 341 unsigned int this_count = SCpnt->request_bufflen >> 9; 342 unsigned int timeout = sdp->timeout; 343 344 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt, 345 "sd_init_command: block=%llu, " 346 "count=%d\n", 347 (unsigned long long)block, 348 this_count)); 349 350 if (!sdp || !scsi_device_online(sdp) || 351 block + rq->nr_sectors > get_capacity(disk)) { 352 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 353 "Finishing %ld sectors\n", 354 rq->nr_sectors)); 355 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 356 "Retry with 0x%p\n", SCpnt)); 357 return 0; 358 } 359 360 if (sdp->changed) { 361 /* 362 * quietly refuse to do anything to a changed disc until 363 * the changed bit has been reset 364 */ 365 /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */ 366 return 0; 367 } 368 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n", 369 (unsigned long long)block)); 370 371 /* 372 * If we have a 1K hardware sectorsize, prevent access to single 373 * 512 byte sectors. In theory we could handle this - in fact 374 * the scsi cdrom driver must be able to handle this because 375 * we typically use 1K blocksizes, and cdroms typically have 376 * 2K hardware sectorsizes. Of course, things are simpler 377 * with the cdrom, since it is read-only. For performance 378 * reasons, the filesystems should be able to handle this 379 * and not force the scsi disk driver to use bounce buffers 380 * for this. 381 */ 382 if (sdp->sector_size == 1024) { 383 if ((block & 1) || (rq->nr_sectors & 1)) { 384 scmd_printk(KERN_ERR, SCpnt, 385 "Bad block number requested\n"); 386 return 0; 387 } else { 388 block = block >> 1; 389 this_count = this_count >> 1; 390 } 391 } 392 if (sdp->sector_size == 2048) { 393 if ((block & 3) || (rq->nr_sectors & 3)) { 394 scmd_printk(KERN_ERR, SCpnt, 395 "Bad block number requested\n"); 396 return 0; 397 } else { 398 block = block >> 2; 399 this_count = this_count >> 2; 400 } 401 } 402 if (sdp->sector_size == 4096) { 403 if ((block & 7) || (rq->nr_sectors & 7)) { 404 scmd_printk(KERN_ERR, SCpnt, 405 "Bad block number requested\n"); 406 return 0; 407 } else { 408 block = block >> 3; 409 this_count = this_count >> 3; 410 } 411 } 412 if (rq_data_dir(rq) == WRITE) { 413 if (!sdp->writeable) { 414 return 0; 415 } 416 SCpnt->cmnd[0] = WRITE_6; 417 SCpnt->sc_data_direction = DMA_TO_DEVICE; 418 } else if (rq_data_dir(rq) == READ) { 419 SCpnt->cmnd[0] = READ_6; 420 SCpnt->sc_data_direction = DMA_FROM_DEVICE; 421 } else { 422 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags); 423 return 0; 424 } 425 426 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 427 "%s %d/%ld 512 byte blocks.\n", 428 (rq_data_dir(rq) == WRITE) ? 429 "writing" : "reading", this_count, 430 rq->nr_sectors)); 431 432 SCpnt->cmnd[1] = 0; 433 434 if (block > 0xffffffff) { 435 SCpnt->cmnd[0] += READ_16 - READ_6; 436 SCpnt->cmnd[1] |= blk_fua_rq(rq) ? 0x8 : 0; 437 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0; 438 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0; 439 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0; 440 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0; 441 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff; 442 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff; 443 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff; 444 SCpnt->cmnd[9] = (unsigned char) block & 0xff; 445 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff; 446 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff; 447 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff; 448 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff; 449 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0; 450 } else if ((this_count > 0xff) || (block > 0x1fffff) || 451 SCpnt->device->use_10_for_rw) { 452 if (this_count > 0xffff) 453 this_count = 0xffff; 454 455 SCpnt->cmnd[0] += READ_10 - READ_6; 456 SCpnt->cmnd[1] |= blk_fua_rq(rq) ? 0x8 : 0; 457 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff; 458 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff; 459 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff; 460 SCpnt->cmnd[5] = (unsigned char) block & 0xff; 461 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; 462 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff; 463 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff; 464 } else { 465 if (unlikely(blk_fua_rq(rq))) { 466 /* 467 * This happens only if this drive failed 468 * 10byte rw command with ILLEGAL_REQUEST 469 * during operation and thus turned off 470 * use_10_for_rw. 471 */ 472 scmd_printk(KERN_ERR, SCpnt, 473 "FUA write on READ/WRITE(6) drive\n"); 474 return 0; 475 } 476 477 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f); 478 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff); 479 SCpnt->cmnd[3] = (unsigned char) block & 0xff; 480 SCpnt->cmnd[4] = (unsigned char) this_count; 481 SCpnt->cmnd[5] = 0; 482 } 483 SCpnt->request_bufflen = this_count * sdp->sector_size; 484 485 /* 486 * We shouldn't disconnect in the middle of a sector, so with a dumb 487 * host adapter, it's safe to assume that we can at least transfer 488 * this many bytes between each connect / disconnect. 489 */ 490 SCpnt->transfersize = sdp->sector_size; 491 SCpnt->underflow = this_count << 9; 492 SCpnt->allowed = SD_MAX_RETRIES; 493 SCpnt->timeout_per_command = timeout; 494 495 /* 496 * This is the completion routine we use. This is matched in terms 497 * of capability to this function. 498 */ 499 SCpnt->done = sd_rw_intr; 500 501 /* 502 * This indicates that the command is ready from our end to be 503 * queued. 504 */ 505 return 1; 506 } 507 508 /** 509 * sd_open - open a scsi disk device 510 * @inode: only i_rdev member may be used 511 * @filp: only f_mode and f_flags may be used 512 * 513 * Returns 0 if successful. Returns a negated errno value in case 514 * of error. 515 * 516 * Note: This can be called from a user context (e.g. fsck(1) ) 517 * or from within the kernel (e.g. as a result of a mount(1) ). 518 * In the latter case @inode and @filp carry an abridged amount 519 * of information as noted above. 520 **/ 521 static int sd_open(struct inode *inode, struct file *filp) 522 { 523 struct gendisk *disk = inode->i_bdev->bd_disk; 524 struct scsi_disk *sdkp; 525 struct scsi_device *sdev; 526 int retval; 527 528 if (!(sdkp = scsi_disk_get(disk))) 529 return -ENXIO; 530 531 532 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n")); 533 534 sdev = sdkp->device; 535 536 /* 537 * If the device is in error recovery, wait until it is done. 538 * If the device is offline, then disallow any access to it. 539 */ 540 retval = -ENXIO; 541 if (!scsi_block_when_processing_errors(sdev)) 542 goto error_out; 543 544 if (sdev->removable || sdkp->write_prot) 545 check_disk_change(inode->i_bdev); 546 547 /* 548 * If the drive is empty, just let the open fail. 549 */ 550 retval = -ENOMEDIUM; 551 if (sdev->removable && !sdkp->media_present && 552 !(filp->f_flags & O_NDELAY)) 553 goto error_out; 554 555 /* 556 * If the device has the write protect tab set, have the open fail 557 * if the user expects to be able to write to the thing. 558 */ 559 retval = -EROFS; 560 if (sdkp->write_prot && (filp->f_mode & FMODE_WRITE)) 561 goto error_out; 562 563 /* 564 * It is possible that the disk changing stuff resulted in 565 * the device being taken offline. If this is the case, 566 * report this to the user, and don't pretend that the 567 * open actually succeeded. 568 */ 569 retval = -ENXIO; 570 if (!scsi_device_online(sdev)) 571 goto error_out; 572 573 if (!sdkp->openers++ && sdev->removable) { 574 if (scsi_block_when_processing_errors(sdev)) 575 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT); 576 } 577 578 return 0; 579 580 error_out: 581 scsi_disk_put(sdkp); 582 return retval; 583 } 584 585 /** 586 * sd_release - invoked when the (last) close(2) is called on this 587 * scsi disk. 588 * @inode: only i_rdev member may be used 589 * @filp: only f_mode and f_flags may be used 590 * 591 * Returns 0. 592 * 593 * Note: may block (uninterruptible) if error recovery is underway 594 * on this disk. 595 **/ 596 static int sd_release(struct inode *inode, struct file *filp) 597 { 598 struct gendisk *disk = inode->i_bdev->bd_disk; 599 struct scsi_disk *sdkp = scsi_disk(disk); 600 struct scsi_device *sdev = sdkp->device; 601 602 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n")); 603 604 if (!--sdkp->openers && sdev->removable) { 605 if (scsi_block_when_processing_errors(sdev)) 606 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW); 607 } 608 609 /* 610 * XXX and what if there are packets in flight and this close() 611 * XXX is followed by a "rmmod sd_mod"? 612 */ 613 scsi_disk_put(sdkp); 614 return 0; 615 } 616 617 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo) 618 { 619 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk); 620 struct scsi_device *sdp = sdkp->device; 621 struct Scsi_Host *host = sdp->host; 622 int diskinfo[4]; 623 624 /* default to most commonly used values */ 625 diskinfo[0] = 0x40; /* 1 << 6 */ 626 diskinfo[1] = 0x20; /* 1 << 5 */ 627 diskinfo[2] = sdkp->capacity >> 11; 628 629 /* override with calculated, extended default, or driver values */ 630 if (host->hostt->bios_param) 631 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo); 632 else 633 scsicam_bios_param(bdev, sdkp->capacity, diskinfo); 634 635 geo->heads = diskinfo[0]; 636 geo->sectors = diskinfo[1]; 637 geo->cylinders = diskinfo[2]; 638 return 0; 639 } 640 641 /** 642 * sd_ioctl - process an ioctl 643 * @inode: only i_rdev/i_bdev members may be used 644 * @filp: only f_mode and f_flags may be used 645 * @cmd: ioctl command number 646 * @arg: this is third argument given to ioctl(2) system call. 647 * Often contains a pointer. 648 * 649 * Returns 0 if successful (some ioctls return postive numbers on 650 * success as well). Returns a negated errno value in case of error. 651 * 652 * Note: most ioctls are forward onto the block subsystem or further 653 * down in the scsi subsytem. 654 **/ 655 static int sd_ioctl(struct inode * inode, struct file * filp, 656 unsigned int cmd, unsigned long arg) 657 { 658 struct block_device *bdev = inode->i_bdev; 659 struct gendisk *disk = bdev->bd_disk; 660 struct scsi_device *sdp = scsi_disk(disk)->device; 661 void __user *p = (void __user *)arg; 662 int error; 663 664 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n", 665 disk->disk_name, cmd)); 666 667 /* 668 * If we are in the middle of error recovery, don't let anyone 669 * else try and use this device. Also, if error recovery fails, it 670 * may try and take the device offline, in which case all further 671 * access to the device is prohibited. 672 */ 673 error = scsi_nonblockable_ioctl(sdp, cmd, p, filp); 674 if (!scsi_block_when_processing_errors(sdp) || !error) 675 return error; 676 677 /* 678 * Send SCSI addressing ioctls directly to mid level, send other 679 * ioctls to block level and then onto mid level if they can't be 680 * resolved. 681 */ 682 switch (cmd) { 683 case SCSI_IOCTL_GET_IDLUN: 684 case SCSI_IOCTL_GET_BUS_NUMBER: 685 return scsi_ioctl(sdp, cmd, p); 686 default: 687 error = scsi_cmd_ioctl(filp, disk, cmd, p); 688 if (error != -ENOTTY) 689 return error; 690 } 691 return scsi_ioctl(sdp, cmd, p); 692 } 693 694 static void set_media_not_present(struct scsi_disk *sdkp) 695 { 696 sdkp->media_present = 0; 697 sdkp->capacity = 0; 698 sdkp->device->changed = 1; 699 } 700 701 /** 702 * sd_media_changed - check if our medium changed 703 * @disk: kernel device descriptor 704 * 705 * Returns 0 if not applicable or no change; 1 if change 706 * 707 * Note: this function is invoked from the block subsystem. 708 **/ 709 static int sd_media_changed(struct gendisk *disk) 710 { 711 struct scsi_disk *sdkp = scsi_disk(disk); 712 struct scsi_device *sdp = sdkp->device; 713 int retval; 714 715 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_media_changed\n")); 716 717 if (!sdp->removable) 718 return 0; 719 720 /* 721 * If the device is offline, don't send any commands - just pretend as 722 * if the command failed. If the device ever comes back online, we 723 * can deal with it then. It is only because of unrecoverable errors 724 * that we would ever take a device offline in the first place. 725 */ 726 if (!scsi_device_online(sdp)) 727 goto not_present; 728 729 /* 730 * Using TEST_UNIT_READY enables differentiation between drive with 731 * no cartridge loaded - NOT READY, drive with changed cartridge - 732 * UNIT ATTENTION, or with same cartridge - GOOD STATUS. 733 * 734 * Drives that auto spin down. eg iomega jaz 1G, will be started 735 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever 736 * sd_revalidate() is called. 737 */ 738 retval = -ENODEV; 739 if (scsi_block_when_processing_errors(sdp)) 740 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES); 741 742 /* 743 * Unable to test, unit probably not ready. This usually 744 * means there is no disc in the drive. Mark as changed, 745 * and we will figure it out later once the drive is 746 * available again. 747 */ 748 if (retval) 749 goto not_present; 750 751 /* 752 * For removable scsi disk we have to recognise the presence 753 * of a disk in the drive. This is kept in the struct scsi_disk 754 * struct and tested at open ! Daniel Roche (dan@lectra.fr) 755 */ 756 sdkp->media_present = 1; 757 758 retval = sdp->changed; 759 sdp->changed = 0; 760 761 return retval; 762 763 not_present: 764 set_media_not_present(sdkp); 765 return 1; 766 } 767 768 static int sd_sync_cache(struct scsi_disk *sdkp) 769 { 770 int retries, res; 771 struct scsi_device *sdp = sdkp->device; 772 struct scsi_sense_hdr sshdr; 773 774 if (!scsi_device_online(sdp)) 775 return -ENODEV; 776 777 778 for (retries = 3; retries > 0; --retries) { 779 unsigned char cmd[10] = { 0 }; 780 781 cmd[0] = SYNCHRONIZE_CACHE; 782 /* 783 * Leave the rest of the command zero to indicate 784 * flush everything. 785 */ 786 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr, 787 SD_TIMEOUT, SD_MAX_RETRIES); 788 if (res == 0) 789 break; 790 } 791 792 if (res) { 793 sd_print_result(sdkp, res); 794 if (driver_byte(res) & DRIVER_SENSE) 795 sd_print_sense_hdr(sdkp, &sshdr); 796 } 797 798 if (res) 799 return -EIO; 800 return 0; 801 } 802 803 static int sd_issue_flush(struct device *dev, sector_t *error_sector) 804 { 805 int ret = 0; 806 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 807 808 if (!sdkp) 809 return -ENODEV; 810 811 if (sdkp->WCE) 812 ret = sd_sync_cache(sdkp); 813 scsi_disk_put(sdkp); 814 return ret; 815 } 816 817 static void sd_prepare_flush(request_queue_t *q, struct request *rq) 818 { 819 memset(rq->cmd, 0, sizeof(rq->cmd)); 820 rq->cmd_type = REQ_TYPE_BLOCK_PC; 821 rq->timeout = SD_TIMEOUT; 822 rq->cmd[0] = SYNCHRONIZE_CACHE; 823 rq->cmd_len = 10; 824 } 825 826 static void sd_rescan(struct device *dev) 827 { 828 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 829 830 if (sdkp) { 831 sd_revalidate_disk(sdkp->disk); 832 scsi_disk_put(sdkp); 833 } 834 } 835 836 837 #ifdef CONFIG_COMPAT 838 /* 839 * This gets directly called from VFS. When the ioctl 840 * is not recognized we go back to the other translation paths. 841 */ 842 static long sd_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 843 { 844 struct block_device *bdev = file->f_path.dentry->d_inode->i_bdev; 845 struct gendisk *disk = bdev->bd_disk; 846 struct scsi_device *sdev = scsi_disk(disk)->device; 847 848 /* 849 * If we are in the middle of error recovery, don't let anyone 850 * else try and use this device. Also, if error recovery fails, it 851 * may try and take the device offline, in which case all further 852 * access to the device is prohibited. 853 */ 854 if (!scsi_block_when_processing_errors(sdev)) 855 return -ENODEV; 856 857 if (sdev->host->hostt->compat_ioctl) { 858 int ret; 859 860 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg); 861 862 return ret; 863 } 864 865 /* 866 * Let the static ioctl translation table take care of it. 867 */ 868 return -ENOIOCTLCMD; 869 } 870 #endif 871 872 static struct block_device_operations sd_fops = { 873 .owner = THIS_MODULE, 874 .open = sd_open, 875 .release = sd_release, 876 .ioctl = sd_ioctl, 877 .getgeo = sd_getgeo, 878 #ifdef CONFIG_COMPAT 879 .compat_ioctl = sd_compat_ioctl, 880 #endif 881 .media_changed = sd_media_changed, 882 .revalidate_disk = sd_revalidate_disk, 883 }; 884 885 /** 886 * sd_rw_intr - bottom half handler: called when the lower level 887 * driver has completed (successfully or otherwise) a scsi command. 888 * @SCpnt: mid-level's per command structure. 889 * 890 * Note: potentially run from within an ISR. Must not block. 891 **/ 892 static void sd_rw_intr(struct scsi_cmnd * SCpnt) 893 { 894 int result = SCpnt->result; 895 unsigned int xfer_size = SCpnt->request_bufflen; 896 unsigned int good_bytes = result ? 0 : xfer_size; 897 u64 start_lba = SCpnt->request->sector; 898 u64 bad_lba; 899 struct scsi_sense_hdr sshdr; 900 int sense_valid = 0; 901 int sense_deferred = 0; 902 int info_valid; 903 904 if (result) { 905 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr); 906 if (sense_valid) 907 sense_deferred = scsi_sense_is_deferred(&sshdr); 908 } 909 #ifdef CONFIG_SCSI_LOGGING 910 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt)); 911 if (sense_valid) { 912 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt, 913 "sd_rw_intr: sb[respc,sk,asc," 914 "ascq]=%x,%x,%x,%x\n", 915 sshdr.response_code, 916 sshdr.sense_key, sshdr.asc, 917 sshdr.ascq)); 918 } 919 #endif 920 if (driver_byte(result) != DRIVER_SENSE && 921 (!sense_valid || sense_deferred)) 922 goto out; 923 924 switch (sshdr.sense_key) { 925 case HARDWARE_ERROR: 926 case MEDIUM_ERROR: 927 if (!blk_fs_request(SCpnt->request)) 928 goto out; 929 info_valid = scsi_get_sense_info_fld(SCpnt->sense_buffer, 930 SCSI_SENSE_BUFFERSIZE, 931 &bad_lba); 932 if (!info_valid) 933 goto out; 934 if (xfer_size <= SCpnt->device->sector_size) 935 goto out; 936 switch (SCpnt->device->sector_size) { 937 case 256: 938 start_lba <<= 1; 939 break; 940 case 512: 941 break; 942 case 1024: 943 start_lba >>= 1; 944 break; 945 case 2048: 946 start_lba >>= 2; 947 break; 948 case 4096: 949 start_lba >>= 3; 950 break; 951 default: 952 /* Print something here with limiting frequency. */ 953 goto out; 954 break; 955 } 956 /* This computation should always be done in terms of 957 * the resolution of the device's medium. 958 */ 959 good_bytes = (bad_lba - start_lba)*SCpnt->device->sector_size; 960 break; 961 case RECOVERED_ERROR: 962 case NO_SENSE: 963 /* Inform the user, but make sure that it's not treated 964 * as a hard error. 965 */ 966 scsi_print_sense("sd", SCpnt); 967 SCpnt->result = 0; 968 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); 969 good_bytes = xfer_size; 970 break; 971 case ILLEGAL_REQUEST: 972 if (SCpnt->device->use_10_for_rw && 973 (SCpnt->cmnd[0] == READ_10 || 974 SCpnt->cmnd[0] == WRITE_10)) 975 SCpnt->device->use_10_for_rw = 0; 976 if (SCpnt->device->use_10_for_ms && 977 (SCpnt->cmnd[0] == MODE_SENSE_10 || 978 SCpnt->cmnd[0] == MODE_SELECT_10)) 979 SCpnt->device->use_10_for_ms = 0; 980 break; 981 default: 982 break; 983 } 984 out: 985 scsi_io_completion(SCpnt, good_bytes); 986 } 987 988 static int media_not_present(struct scsi_disk *sdkp, 989 struct scsi_sense_hdr *sshdr) 990 { 991 992 if (!scsi_sense_valid(sshdr)) 993 return 0; 994 /* not invoked for commands that could return deferred errors */ 995 if (sshdr->sense_key != NOT_READY && 996 sshdr->sense_key != UNIT_ATTENTION) 997 return 0; 998 if (sshdr->asc != 0x3A) /* medium not present */ 999 return 0; 1000 1001 set_media_not_present(sdkp); 1002 return 1; 1003 } 1004 1005 /* 1006 * spinup disk - called only in sd_revalidate_disk() 1007 */ 1008 static void 1009 sd_spinup_disk(struct scsi_disk *sdkp) 1010 { 1011 unsigned char cmd[10]; 1012 unsigned long spintime_expire = 0; 1013 int retries, spintime; 1014 unsigned int the_result; 1015 struct scsi_sense_hdr sshdr; 1016 int sense_valid = 0; 1017 1018 spintime = 0; 1019 1020 /* Spin up drives, as required. Only do this at boot time */ 1021 /* Spinup needs to be done for module loads too. */ 1022 do { 1023 retries = 0; 1024 1025 do { 1026 cmd[0] = TEST_UNIT_READY; 1027 memset((void *) &cmd[1], 0, 9); 1028 1029 the_result = scsi_execute_req(sdkp->device, cmd, 1030 DMA_NONE, NULL, 0, 1031 &sshdr, SD_TIMEOUT, 1032 SD_MAX_RETRIES); 1033 1034 /* 1035 * If the drive has indicated to us that it 1036 * doesn't have any media in it, don't bother 1037 * with any more polling. 1038 */ 1039 if (media_not_present(sdkp, &sshdr)) 1040 return; 1041 1042 if (the_result) 1043 sense_valid = scsi_sense_valid(&sshdr); 1044 retries++; 1045 } while (retries < 3 && 1046 (!scsi_status_is_good(the_result) || 1047 ((driver_byte(the_result) & DRIVER_SENSE) && 1048 sense_valid && sshdr.sense_key == UNIT_ATTENTION))); 1049 1050 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) { 1051 /* no sense, TUR either succeeded or failed 1052 * with a status error */ 1053 if(!spintime && !scsi_status_is_good(the_result)) { 1054 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n"); 1055 sd_print_result(sdkp, the_result); 1056 } 1057 break; 1058 } 1059 1060 /* 1061 * The device does not want the automatic start to be issued. 1062 */ 1063 if (sdkp->device->no_start_on_add) { 1064 break; 1065 } 1066 1067 /* 1068 * If manual intervention is required, or this is an 1069 * absent USB storage device, a spinup is meaningless. 1070 */ 1071 if (sense_valid && 1072 sshdr.sense_key == NOT_READY && 1073 sshdr.asc == 4 && sshdr.ascq == 3) { 1074 break; /* manual intervention required */ 1075 1076 /* 1077 * Issue command to spin up drive when not ready 1078 */ 1079 } else if (sense_valid && sshdr.sense_key == NOT_READY) { 1080 if (!spintime) { 1081 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk..."); 1082 cmd[0] = START_STOP; 1083 cmd[1] = 1; /* Return immediately */ 1084 memset((void *) &cmd[2], 0, 8); 1085 cmd[4] = 1; /* Start spin cycle */ 1086 scsi_execute_req(sdkp->device, cmd, DMA_NONE, 1087 NULL, 0, &sshdr, 1088 SD_TIMEOUT, SD_MAX_RETRIES); 1089 spintime_expire = jiffies + 100 * HZ; 1090 spintime = 1; 1091 } 1092 /* Wait 1 second for next try */ 1093 msleep(1000); 1094 printk("."); 1095 1096 /* 1097 * Wait for USB flash devices with slow firmware. 1098 * Yes, this sense key/ASC combination shouldn't 1099 * occur here. It's characteristic of these devices. 1100 */ 1101 } else if (sense_valid && 1102 sshdr.sense_key == UNIT_ATTENTION && 1103 sshdr.asc == 0x28) { 1104 if (!spintime) { 1105 spintime_expire = jiffies + 5 * HZ; 1106 spintime = 1; 1107 } 1108 /* Wait 1 second for next try */ 1109 msleep(1000); 1110 } else { 1111 /* we don't understand the sense code, so it's 1112 * probably pointless to loop */ 1113 if(!spintime) { 1114 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n"); 1115 sd_print_sense_hdr(sdkp, &sshdr); 1116 } 1117 break; 1118 } 1119 1120 } while (spintime && time_before_eq(jiffies, spintime_expire)); 1121 1122 if (spintime) { 1123 if (scsi_status_is_good(the_result)) 1124 printk("ready\n"); 1125 else 1126 printk("not responding...\n"); 1127 } 1128 } 1129 1130 /* 1131 * read disk capacity 1132 */ 1133 static void 1134 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer) 1135 { 1136 unsigned char cmd[16]; 1137 int the_result, retries; 1138 int sector_size = 0; 1139 int longrc = 0; 1140 struct scsi_sense_hdr sshdr; 1141 int sense_valid = 0; 1142 struct scsi_device *sdp = sdkp->device; 1143 1144 repeat: 1145 retries = 3; 1146 do { 1147 if (longrc) { 1148 memset((void *) cmd, 0, 16); 1149 cmd[0] = SERVICE_ACTION_IN; 1150 cmd[1] = SAI_READ_CAPACITY_16; 1151 cmd[13] = 12; 1152 memset((void *) buffer, 0, 12); 1153 } else { 1154 cmd[0] = READ_CAPACITY; 1155 memset((void *) &cmd[1], 0, 9); 1156 memset((void *) buffer, 0, 8); 1157 } 1158 1159 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE, 1160 buffer, longrc ? 12 : 8, &sshdr, 1161 SD_TIMEOUT, SD_MAX_RETRIES); 1162 1163 if (media_not_present(sdkp, &sshdr)) 1164 return; 1165 1166 if (the_result) 1167 sense_valid = scsi_sense_valid(&sshdr); 1168 retries--; 1169 1170 } while (the_result && retries); 1171 1172 if (the_result && !longrc) { 1173 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n"); 1174 sd_print_result(sdkp, the_result); 1175 if (driver_byte(the_result) & DRIVER_SENSE) 1176 sd_print_sense_hdr(sdkp, &sshdr); 1177 else 1178 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n"); 1179 1180 /* Set dirty bit for removable devices if not ready - 1181 * sometimes drives will not report this properly. */ 1182 if (sdp->removable && 1183 sense_valid && sshdr.sense_key == NOT_READY) 1184 sdp->changed = 1; 1185 1186 /* Either no media are present but the drive didn't tell us, 1187 or they are present but the read capacity command fails */ 1188 /* sdkp->media_present = 0; -- not always correct */ 1189 sdkp->capacity = 0; /* unknown mapped to zero - as usual */ 1190 1191 return; 1192 } else if (the_result && longrc) { 1193 /* READ CAPACITY(16) has been failed */ 1194 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n"); 1195 sd_print_result(sdkp, the_result); 1196 sd_printk(KERN_NOTICE, sdkp, "Use 0xffffffff as device size\n"); 1197 1198 sdkp->capacity = 1 + (sector_t) 0xffffffff; 1199 goto got_data; 1200 } 1201 1202 if (!longrc) { 1203 sector_size = (buffer[4] << 24) | 1204 (buffer[5] << 16) | (buffer[6] << 8) | buffer[7]; 1205 if (buffer[0] == 0xff && buffer[1] == 0xff && 1206 buffer[2] == 0xff && buffer[3] == 0xff) { 1207 if(sizeof(sdkp->capacity) > 4) { 1208 sd_printk(KERN_NOTICE, sdkp, "Very big device. " 1209 "Trying to use READ CAPACITY(16).\n"); 1210 longrc = 1; 1211 goto repeat; 1212 } 1213 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use " 1214 "a kernel compiled with support for large " 1215 "block devices.\n"); 1216 sdkp->capacity = 0; 1217 goto got_data; 1218 } 1219 sdkp->capacity = 1 + (((sector_t)buffer[0] << 24) | 1220 (buffer[1] << 16) | 1221 (buffer[2] << 8) | 1222 buffer[3]); 1223 } else { 1224 sdkp->capacity = 1 + (((u64)buffer[0] << 56) | 1225 ((u64)buffer[1] << 48) | 1226 ((u64)buffer[2] << 40) | 1227 ((u64)buffer[3] << 32) | 1228 ((sector_t)buffer[4] << 24) | 1229 ((sector_t)buffer[5] << 16) | 1230 ((sector_t)buffer[6] << 8) | 1231 (sector_t)buffer[7]); 1232 1233 sector_size = (buffer[8] << 24) | 1234 (buffer[9] << 16) | (buffer[10] << 8) | buffer[11]; 1235 } 1236 1237 /* Some devices return the total number of sectors, not the 1238 * highest sector number. Make the necessary adjustment. */ 1239 if (sdp->fix_capacity) { 1240 --sdkp->capacity; 1241 1242 /* Some devices have version which report the correct sizes 1243 * and others which do not. We guess size according to a heuristic 1244 * and err on the side of lowering the capacity. */ 1245 } else { 1246 if (sdp->guess_capacity) 1247 if (sdkp->capacity & 0x01) /* odd sizes are odd */ 1248 --sdkp->capacity; 1249 } 1250 1251 got_data: 1252 if (sector_size == 0) { 1253 sector_size = 512; 1254 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, " 1255 "assuming 512.\n"); 1256 } 1257 1258 if (sector_size != 512 && 1259 sector_size != 1024 && 1260 sector_size != 2048 && 1261 sector_size != 4096 && 1262 sector_size != 256) { 1263 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n", 1264 sector_size); 1265 /* 1266 * The user might want to re-format the drive with 1267 * a supported sectorsize. Once this happens, it 1268 * would be relatively trivial to set the thing up. 1269 * For this reason, we leave the thing in the table. 1270 */ 1271 sdkp->capacity = 0; 1272 /* 1273 * set a bogus sector size so the normal read/write 1274 * logic in the block layer will eventually refuse any 1275 * request on this device without tripping over power 1276 * of two sector size assumptions 1277 */ 1278 sector_size = 512; 1279 } 1280 { 1281 /* 1282 * The msdos fs needs to know the hardware sector size 1283 * So I have created this table. See ll_rw_blk.c 1284 * Jacques Gelinas (Jacques@solucorp.qc.ca) 1285 */ 1286 int hard_sector = sector_size; 1287 sector_t sz = (sdkp->capacity/2) * (hard_sector/256); 1288 request_queue_t *queue = sdp->request_queue; 1289 sector_t mb = sz; 1290 1291 blk_queue_hardsect_size(queue, hard_sector); 1292 /* avoid 64-bit division on 32-bit platforms */ 1293 sector_div(sz, 625); 1294 mb -= sz - 974; 1295 sector_div(mb, 1950); 1296 1297 sd_printk(KERN_NOTICE, sdkp, 1298 "%llu %d-byte hardware sectors (%llu MB)\n", 1299 (unsigned long long)sdkp->capacity, 1300 hard_sector, (unsigned long long)mb); 1301 } 1302 1303 /* Rescale capacity to 512-byte units */ 1304 if (sector_size == 4096) 1305 sdkp->capacity <<= 3; 1306 else if (sector_size == 2048) 1307 sdkp->capacity <<= 2; 1308 else if (sector_size == 1024) 1309 sdkp->capacity <<= 1; 1310 else if (sector_size == 256) 1311 sdkp->capacity >>= 1; 1312 1313 sdkp->device->sector_size = sector_size; 1314 } 1315 1316 /* called with buffer of length 512 */ 1317 static inline int 1318 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage, 1319 unsigned char *buffer, int len, struct scsi_mode_data *data, 1320 struct scsi_sense_hdr *sshdr) 1321 { 1322 return scsi_mode_sense(sdp, dbd, modepage, buffer, len, 1323 SD_TIMEOUT, SD_MAX_RETRIES, data, 1324 sshdr); 1325 } 1326 1327 /* 1328 * read write protect setting, if possible - called only in sd_revalidate_disk() 1329 * called with buffer of length SD_BUF_SIZE 1330 */ 1331 static void 1332 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer) 1333 { 1334 int res; 1335 struct scsi_device *sdp = sdkp->device; 1336 struct scsi_mode_data data; 1337 1338 set_disk_ro(sdkp->disk, 0); 1339 if (sdp->skip_ms_page_3f) { 1340 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n"); 1341 return; 1342 } 1343 1344 if (sdp->use_192_bytes_for_3f) { 1345 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL); 1346 } else { 1347 /* 1348 * First attempt: ask for all pages (0x3F), but only 4 bytes. 1349 * We have to start carefully: some devices hang if we ask 1350 * for more than is available. 1351 */ 1352 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL); 1353 1354 /* 1355 * Second attempt: ask for page 0 When only page 0 is 1356 * implemented, a request for page 3F may return Sense Key 1357 * 5: Illegal Request, Sense Code 24: Invalid field in 1358 * CDB. 1359 */ 1360 if (!scsi_status_is_good(res)) 1361 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL); 1362 1363 /* 1364 * Third attempt: ask 255 bytes, as we did earlier. 1365 */ 1366 if (!scsi_status_is_good(res)) 1367 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255, 1368 &data, NULL); 1369 } 1370 1371 if (!scsi_status_is_good(res)) { 1372 sd_printk(KERN_WARNING, sdkp, 1373 "Test WP failed, assume Write Enabled\n"); 1374 } else { 1375 sdkp->write_prot = ((data.device_specific & 0x80) != 0); 1376 set_disk_ro(sdkp->disk, sdkp->write_prot); 1377 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n", 1378 sdkp->write_prot ? "on" : "off"); 1379 sd_printk(KERN_DEBUG, sdkp, 1380 "Mode Sense: %02x %02x %02x %02x\n", 1381 buffer[0], buffer[1], buffer[2], buffer[3]); 1382 } 1383 } 1384 1385 /* 1386 * sd_read_cache_type - called only from sd_revalidate_disk() 1387 * called with buffer of length SD_BUF_SIZE 1388 */ 1389 static void 1390 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer) 1391 { 1392 int len = 0, res; 1393 struct scsi_device *sdp = sdkp->device; 1394 1395 int dbd; 1396 int modepage; 1397 struct scsi_mode_data data; 1398 struct scsi_sense_hdr sshdr; 1399 1400 if (sdp->skip_ms_page_8) 1401 goto defaults; 1402 1403 if (sdp->type == TYPE_RBC) { 1404 modepage = 6; 1405 dbd = 8; 1406 } else { 1407 modepage = 8; 1408 dbd = 0; 1409 } 1410 1411 /* cautiously ask */ 1412 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, 4, &data, &sshdr); 1413 1414 if (!scsi_status_is_good(res)) 1415 goto bad_sense; 1416 1417 if (!data.header_length) { 1418 modepage = 6; 1419 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n"); 1420 } 1421 1422 /* that went OK, now ask for the proper length */ 1423 len = data.length; 1424 1425 /* 1426 * We're only interested in the first three bytes, actually. 1427 * But the data cache page is defined for the first 20. 1428 */ 1429 if (len < 3) 1430 goto bad_sense; 1431 if (len > 20) 1432 len = 20; 1433 1434 /* Take headers and block descriptors into account */ 1435 len += data.header_length + data.block_descriptor_length; 1436 if (len > SD_BUF_SIZE) 1437 goto bad_sense; 1438 1439 /* Get the data */ 1440 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, &data, &sshdr); 1441 1442 if (scsi_status_is_good(res)) { 1443 int offset = data.header_length + data.block_descriptor_length; 1444 1445 if (offset >= SD_BUF_SIZE - 2) { 1446 sd_printk(KERN_ERR, sdkp, "Malformed MODE SENSE response\n"); 1447 goto defaults; 1448 } 1449 1450 if ((buffer[offset] & 0x3f) != modepage) { 1451 sd_printk(KERN_ERR, sdkp, "Got wrong page\n"); 1452 goto defaults; 1453 } 1454 1455 if (modepage == 8) { 1456 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0); 1457 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0); 1458 } else { 1459 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0); 1460 sdkp->RCD = 0; 1461 } 1462 1463 sdkp->DPOFUA = (data.device_specific & 0x10) != 0; 1464 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) { 1465 sd_printk(KERN_NOTICE, sdkp, 1466 "Uses READ/WRITE(6), disabling FUA\n"); 1467 sdkp->DPOFUA = 0; 1468 } 1469 1470 sd_printk(KERN_NOTICE, sdkp, 1471 "Write cache: %s, read cache: %s, %s\n", 1472 sdkp->WCE ? "enabled" : "disabled", 1473 sdkp->RCD ? "disabled" : "enabled", 1474 sdkp->DPOFUA ? "supports DPO and FUA" 1475 : "doesn't support DPO or FUA"); 1476 1477 return; 1478 } 1479 1480 bad_sense: 1481 if (scsi_sense_valid(&sshdr) && 1482 sshdr.sense_key == ILLEGAL_REQUEST && 1483 sshdr.asc == 0x24 && sshdr.ascq == 0x0) 1484 /* Invalid field in CDB */ 1485 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n"); 1486 else 1487 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n"); 1488 1489 defaults: 1490 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n"); 1491 sdkp->WCE = 0; 1492 sdkp->RCD = 0; 1493 sdkp->DPOFUA = 0; 1494 } 1495 1496 /** 1497 * sd_revalidate_disk - called the first time a new disk is seen, 1498 * performs disk spin up, read_capacity, etc. 1499 * @disk: struct gendisk we care about 1500 **/ 1501 static int sd_revalidate_disk(struct gendisk *disk) 1502 { 1503 struct scsi_disk *sdkp = scsi_disk(disk); 1504 struct scsi_device *sdp = sdkp->device; 1505 unsigned char *buffer; 1506 unsigned ordered; 1507 1508 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, 1509 "sd_revalidate_disk\n")); 1510 1511 /* 1512 * If the device is offline, don't try and read capacity or any 1513 * of the other niceties. 1514 */ 1515 if (!scsi_device_online(sdp)) 1516 goto out; 1517 1518 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL | __GFP_DMA); 1519 if (!buffer) { 1520 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory " 1521 "allocation failure.\n"); 1522 goto out; 1523 } 1524 1525 /* defaults, until the device tells us otherwise */ 1526 sdp->sector_size = 512; 1527 sdkp->capacity = 0; 1528 sdkp->media_present = 1; 1529 sdkp->write_prot = 0; 1530 sdkp->WCE = 0; 1531 sdkp->RCD = 0; 1532 1533 sd_spinup_disk(sdkp); 1534 1535 /* 1536 * Without media there is no reason to ask; moreover, some devices 1537 * react badly if we do. 1538 */ 1539 if (sdkp->media_present) { 1540 sd_read_capacity(sdkp, buffer); 1541 sd_read_write_protect_flag(sdkp, buffer); 1542 sd_read_cache_type(sdkp, buffer); 1543 } 1544 1545 /* 1546 * We now have all cache related info, determine how we deal 1547 * with ordered requests. Note that as the current SCSI 1548 * dispatch function can alter request order, we cannot use 1549 * QUEUE_ORDERED_TAG_* even when ordered tag is supported. 1550 */ 1551 if (sdkp->WCE) 1552 ordered = sdkp->DPOFUA 1553 ? QUEUE_ORDERED_DRAIN_FUA : QUEUE_ORDERED_DRAIN_FLUSH; 1554 else 1555 ordered = QUEUE_ORDERED_DRAIN; 1556 1557 blk_queue_ordered(sdkp->disk->queue, ordered, sd_prepare_flush); 1558 1559 set_capacity(disk, sdkp->capacity); 1560 kfree(buffer); 1561 1562 out: 1563 return 0; 1564 } 1565 1566 /** 1567 * sd_probe - called during driver initialization and whenever a 1568 * new scsi device is attached to the system. It is called once 1569 * for each scsi device (not just disks) present. 1570 * @dev: pointer to device object 1571 * 1572 * Returns 0 if successful (or not interested in this scsi device 1573 * (e.g. scanner)); 1 when there is an error. 1574 * 1575 * Note: this function is invoked from the scsi mid-level. 1576 * This function sets up the mapping between a given 1577 * <host,channel,id,lun> (found in sdp) and new device name 1578 * (e.g. /dev/sda). More precisely it is the block device major 1579 * and minor number that is chosen here. 1580 * 1581 * Assume sd_attach is not re-entrant (for time being) 1582 * Also think about sd_attach() and sd_remove() running coincidentally. 1583 **/ 1584 static int sd_probe(struct device *dev) 1585 { 1586 struct scsi_device *sdp = to_scsi_device(dev); 1587 struct scsi_disk *sdkp; 1588 struct gendisk *gd; 1589 u32 index; 1590 int error; 1591 1592 error = -ENODEV; 1593 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC) 1594 goto out; 1595 1596 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp, 1597 "sd_attach\n")); 1598 1599 error = -ENOMEM; 1600 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL); 1601 if (!sdkp) 1602 goto out; 1603 1604 gd = alloc_disk(16); 1605 if (!gd) 1606 goto out_free; 1607 1608 if (!idr_pre_get(&sd_index_idr, GFP_KERNEL)) 1609 goto out_put; 1610 1611 spin_lock(&sd_index_lock); 1612 error = idr_get_new(&sd_index_idr, NULL, &index); 1613 spin_unlock(&sd_index_lock); 1614 1615 if (index >= SD_MAX_DISKS) 1616 error = -EBUSY; 1617 if (error) 1618 goto out_put; 1619 1620 sdkp->device = sdp; 1621 sdkp->driver = &sd_template; 1622 sdkp->disk = gd; 1623 sdkp->index = index; 1624 sdkp->openers = 0; 1625 1626 if (!sdp->timeout) { 1627 if (sdp->type != TYPE_MOD) 1628 sdp->timeout = SD_TIMEOUT; 1629 else 1630 sdp->timeout = SD_MOD_TIMEOUT; 1631 } 1632 1633 class_device_initialize(&sdkp->cdev); 1634 sdkp->cdev.dev = &sdp->sdev_gendev; 1635 sdkp->cdev.class = &sd_disk_class; 1636 strncpy(sdkp->cdev.class_id, sdp->sdev_gendev.bus_id, BUS_ID_SIZE); 1637 1638 if (class_device_add(&sdkp->cdev)) 1639 goto out_put; 1640 1641 get_device(&sdp->sdev_gendev); 1642 1643 gd->major = sd_major((index & 0xf0) >> 4); 1644 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00); 1645 gd->minors = 16; 1646 gd->fops = &sd_fops; 1647 1648 if (index < 26) { 1649 sprintf(gd->disk_name, "sd%c", 'a' + index % 26); 1650 } else if (index < (26 + 1) * 26) { 1651 sprintf(gd->disk_name, "sd%c%c", 1652 'a' + index / 26 - 1,'a' + index % 26); 1653 } else { 1654 const unsigned int m1 = (index / 26 - 1) / 26 - 1; 1655 const unsigned int m2 = (index / 26 - 1) % 26; 1656 const unsigned int m3 = index % 26; 1657 sprintf(gd->disk_name, "sd%c%c%c", 1658 'a' + m1, 'a' + m2, 'a' + m3); 1659 } 1660 1661 gd->private_data = &sdkp->driver; 1662 gd->queue = sdkp->device->request_queue; 1663 1664 sd_revalidate_disk(gd); 1665 1666 gd->driverfs_dev = &sdp->sdev_gendev; 1667 gd->flags = GENHD_FL_DRIVERFS; 1668 if (sdp->removable) 1669 gd->flags |= GENHD_FL_REMOVABLE; 1670 1671 dev_set_drvdata(dev, sdkp); 1672 add_disk(gd); 1673 1674 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n", 1675 sdp->removable ? "removable " : ""); 1676 1677 return 0; 1678 1679 out_put: 1680 put_disk(gd); 1681 out_free: 1682 kfree(sdkp); 1683 out: 1684 return error; 1685 } 1686 1687 /** 1688 * sd_remove - called whenever a scsi disk (previously recognized by 1689 * sd_probe) is detached from the system. It is called (potentially 1690 * multiple times) during sd module unload. 1691 * @sdp: pointer to mid level scsi device object 1692 * 1693 * Note: this function is invoked from the scsi mid-level. 1694 * This function potentially frees up a device name (e.g. /dev/sdc) 1695 * that could be re-used by a subsequent sd_probe(). 1696 * This function is not called when the built-in sd driver is "exit-ed". 1697 **/ 1698 static int sd_remove(struct device *dev) 1699 { 1700 struct scsi_disk *sdkp = dev_get_drvdata(dev); 1701 1702 class_device_del(&sdkp->cdev); 1703 del_gendisk(sdkp->disk); 1704 sd_shutdown(dev); 1705 1706 mutex_lock(&sd_ref_mutex); 1707 dev_set_drvdata(dev, NULL); 1708 class_device_put(&sdkp->cdev); 1709 mutex_unlock(&sd_ref_mutex); 1710 1711 return 0; 1712 } 1713 1714 /** 1715 * scsi_disk_release - Called to free the scsi_disk structure 1716 * @cdev: pointer to embedded class device 1717 * 1718 * sd_ref_mutex must be held entering this routine. Because it is 1719 * called on last put, you should always use the scsi_disk_get() 1720 * scsi_disk_put() helpers which manipulate the semaphore directly 1721 * and never do a direct class_device_put(). 1722 **/ 1723 static void scsi_disk_release(struct class_device *cdev) 1724 { 1725 struct scsi_disk *sdkp = to_scsi_disk(cdev); 1726 struct gendisk *disk = sdkp->disk; 1727 1728 spin_lock(&sd_index_lock); 1729 idr_remove(&sd_index_idr, sdkp->index); 1730 spin_unlock(&sd_index_lock); 1731 1732 disk->private_data = NULL; 1733 put_disk(disk); 1734 put_device(&sdkp->device->sdev_gendev); 1735 1736 kfree(sdkp); 1737 } 1738 1739 static int sd_start_stop_device(struct scsi_disk *sdkp, int start) 1740 { 1741 unsigned char cmd[6] = { START_STOP }; /* START_VALID */ 1742 struct scsi_sense_hdr sshdr; 1743 struct scsi_device *sdp = sdkp->device; 1744 int res; 1745 1746 if (start) 1747 cmd[4] |= 1; /* START */ 1748 1749 if (!scsi_device_online(sdp)) 1750 return -ENODEV; 1751 1752 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr, 1753 SD_TIMEOUT, SD_MAX_RETRIES); 1754 if (res) { 1755 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n"); 1756 sd_print_result(sdkp, res); 1757 if (driver_byte(res) & DRIVER_SENSE) 1758 sd_print_sense_hdr(sdkp, &sshdr); 1759 } 1760 1761 return res; 1762 } 1763 1764 /* 1765 * Send a SYNCHRONIZE CACHE instruction down to the device through 1766 * the normal SCSI command structure. Wait for the command to 1767 * complete. 1768 */ 1769 static void sd_shutdown(struct device *dev) 1770 { 1771 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 1772 1773 if (!sdkp) 1774 return; /* this can happen */ 1775 1776 if (sdkp->WCE) { 1777 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); 1778 sd_sync_cache(sdkp); 1779 } 1780 1781 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) { 1782 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); 1783 sd_start_stop_device(sdkp, 0); 1784 } 1785 1786 scsi_disk_put(sdkp); 1787 } 1788 1789 static int sd_suspend(struct device *dev, pm_message_t mesg) 1790 { 1791 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 1792 int ret; 1793 1794 if (!sdkp) 1795 return 0; /* this can happen */ 1796 1797 if (sdkp->WCE) { 1798 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); 1799 ret = sd_sync_cache(sdkp); 1800 if (ret) 1801 return ret; 1802 } 1803 1804 if (mesg.event == PM_EVENT_SUSPEND && 1805 sdkp->device->manage_start_stop) { 1806 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); 1807 ret = sd_start_stop_device(sdkp, 0); 1808 if (ret) 1809 return ret; 1810 } 1811 1812 return 0; 1813 } 1814 1815 static int sd_resume(struct device *dev) 1816 { 1817 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 1818 1819 if (!sdkp->device->manage_start_stop) 1820 return 0; 1821 1822 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n"); 1823 1824 return sd_start_stop_device(sdkp, 1); 1825 } 1826 1827 /** 1828 * init_sd - entry point for this driver (both when built in or when 1829 * a module). 1830 * 1831 * Note: this function registers this driver with the scsi mid-level. 1832 **/ 1833 static int __init init_sd(void) 1834 { 1835 int majors = 0, i, err; 1836 1837 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n")); 1838 1839 for (i = 0; i < SD_MAJORS; i++) 1840 if (register_blkdev(sd_major(i), "sd") == 0) 1841 majors++; 1842 1843 if (!majors) 1844 return -ENODEV; 1845 1846 err = class_register(&sd_disk_class); 1847 if (err) 1848 goto err_out; 1849 1850 err = scsi_register_driver(&sd_template.gendrv); 1851 if (err) 1852 goto err_out_class; 1853 1854 return 0; 1855 1856 err_out_class: 1857 class_unregister(&sd_disk_class); 1858 err_out: 1859 for (i = 0; i < SD_MAJORS; i++) 1860 unregister_blkdev(sd_major(i), "sd"); 1861 return err; 1862 } 1863 1864 /** 1865 * exit_sd - exit point for this driver (when it is a module). 1866 * 1867 * Note: this function unregisters this driver from the scsi mid-level. 1868 **/ 1869 static void __exit exit_sd(void) 1870 { 1871 int i; 1872 1873 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n")); 1874 1875 scsi_unregister_driver(&sd_template.gendrv); 1876 class_unregister(&sd_disk_class); 1877 1878 for (i = 0; i < SD_MAJORS; i++) 1879 unregister_blkdev(sd_major(i), "sd"); 1880 } 1881 1882 module_init(init_sd); 1883 module_exit(exit_sd); 1884 1885 static void sd_print_sense_hdr(struct scsi_disk *sdkp, 1886 struct scsi_sense_hdr *sshdr) 1887 { 1888 sd_printk(KERN_INFO, sdkp, ""); 1889 scsi_show_sense_hdr(sshdr); 1890 sd_printk(KERN_INFO, sdkp, ""); 1891 scsi_show_extd_sense(sshdr->asc, sshdr->ascq); 1892 } 1893 1894 static void sd_print_result(struct scsi_disk *sdkp, int result) 1895 { 1896 sd_printk(KERN_INFO, sdkp, ""); 1897 scsi_show_result(result); 1898 } 1899 1900