drivers/scsi/scsi_sysfs.c

   1 /*
   2  * scsi_sysfs.c
   3  *
   4  * SCSI sysfs interface routines.
   5  *
   6  * Created to pull SCSI mid layer sysfs routines into one file.
   7  */
   8
   9 #include <linux/module.h>
  10 #include <linux/init.h>
  11 #include <linux/blkdev.h>
  12 #include <linux/device.h>
  13
  14 #include <scsi/scsi.h>
  15 #include <scsi/scsi_device.h>
  16 #include <scsi/scsi_host.h>
  17 #include <scsi/scsi_tcq.h>
  18 #include <scsi/scsi_transport.h>
  19
  20 #include "scsi_priv.h"
  21 #include "scsi_logging.h"
  22
  23 static const struct {
  24         enum scsi_device_state  value;
  25         char                    *name;
  26 } sdev_states[] = {
  27         { SDEV_CREATED, "created" },
  28         { SDEV_RUNNING, "running" },
  29         { SDEV_CANCEL, "cancel" },
  30         { SDEV_DEL, "deleted" },
  31         { SDEV_QUIESCE, "quiesce" },
  32         { SDEV_OFFLINE, "offline" },
  33         { SDEV_BLOCK,   "blocked" },
  34 };
  35
  36 const char *scsi_device_state_name(enum scsi_device_state state)
  37 {
  38         int i;
  39         char *name = NULL;
  40
  41         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
  42                 if (sdev_states[i].value == state) {
  43                         name = sdev_states[i].name;
  44                         break;
  45                 }
  46         }
  47         return name;
  48 }
  49
  50 static const struct {
  51         enum scsi_host_state    value;
  52         char                    *name;
  53 } shost_states[] = {
  54         { SHOST_CREATED, "created" },
  55         { SHOST_RUNNING, "running" },
  56         { SHOST_CANCEL, "cancel" },
  57         { SHOST_DEL, "deleted" },
  58         { SHOST_RECOVERY, "recovery" },
  59         { SHOST_CANCEL_RECOVERY, "cancel/recovery" },
  60         { SHOST_DEL_RECOVERY, "deleted/recovery", },
  61 };
  62 const char *scsi_host_state_name(enum scsi_host_state state)
  63 {
  64         int i;
  65         char *name = NULL;
  66
  67         for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
  68                 if (shost_states[i].value == state) {
  69                         name = shost_states[i].name;
  70                         break;
  71                 }
  72         }
  73         return name;
  74 }
  75
  76 static int check_set(unsigned int *val, char *src)
  77 {
  78         char *last;
  79
  80         if (strncmp(src, "-", 20) == 0) {
  81                 *val = SCAN_WILD_CARD;
  82         } else {
  83                 /*
  84                  * Doesn't check for int overflow
  85                  */
  86                 *val = simple_strtoul(src, &last, 0);
  87                 if (*last != '\0')
  88                         return 1;
  89         }
  90         return 0;
  91 }
  92
  93 static int scsi_scan(struct Scsi_Host *shost, const char *str)
  94 {
  95         char s1[15], s2[15], s3[15], junk;
  96         unsigned int channel, id, lun;
  97         int res;
  98
  99         res = sscanf(str, "%10s %10s %10s %c", s1, s2, s3, &junk);
 100         if (res != 3)
 101                 return -EINVAL;
 102         if (check_set(&channel, s1))
 103                 return -EINVAL;
 104         if (check_set(&id, s2))
 105                 return -EINVAL;
 106         if (check_set(&lun, s3))
 107                 return -EINVAL;
 108         if (shost->transportt->user_scan)
 109                 res = shost->transportt->user_scan(shost, channel, id, lun);
 110         else
 111                 res = scsi_scan_host_selected(shost, channel, id, lun, 1);
 112         return res;
 113 }
 114
 115 /*
 116  * shost_show_function: macro to create an attr function that can be used to
 117  * show a non-bit field.
 118  */
 119 #define shost_show_function(name, field, format_string)                 \
 120 static ssize_t                                                          \
 121 show_##name (struct class_device *class_dev, char *buf)                 \
 122 {                                                                       \
 123         struct Scsi_Host *shost = class_to_shost(class_dev);            \
 124         return snprintf (buf, 20, format_string, shost->field);         \
 125 }
 126
 127 /*
 128  * shost_rd_attr: macro to create a function and attribute variable for a
 129  * read only field.
 130  */
 131 #define shost_rd_attr2(name, field, format_string)                      \
 132         shost_show_function(name, field, format_string)                 \
 133 static CLASS_DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
 134
 135 #define shost_rd_attr(field, format_string) \
 136 shost_rd_attr2(field, field, format_string)
 137
 138 /*
 139  * Create the actual show/store functions and data structures.
 140  */
 141
 142 static ssize_t store_scan(struct class_device *class_dev, const char *buf,
 143                           size_t count)
 144 {
 145         struct Scsi_Host *shost = class_to_shost(class_dev);
 146         int res;
 147
 148         res = scsi_scan(shost, buf);
 149         if (res == 0)
 150                 res = count;
 151         return res;
 152 };
 153 static CLASS_DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
 154
 155 static ssize_t
 156 store_shost_state(struct class_device *class_dev, const char *buf, size_t count)
 157 {
 158         int i;
 159         struct Scsi_Host *shost = class_to_shost(class_dev);
 160         enum scsi_host_state state = 0;
 161
 162         for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
 163                 const int len = strlen(shost_states[i].name);
 164                 if (strncmp(shost_states[i].name, buf, len) == 0 &&
 165                    buf[len] == '\n') {
 166                         state = shost_states[i].value;
 167                         break;
 168                 }
 169         }
 170         if (!state)
 171                 return -EINVAL;
 172
 173         if (scsi_host_set_state(shost, state))
 174                 return -EINVAL;
 175         return count;
 176 }
 177
 178 static ssize_t
 179 show_shost_state(struct class_device *class_dev, char *buf)
 180 {
 181         struct Scsi_Host *shost = class_to_shost(class_dev);
 182         const char *name = scsi_host_state_name(shost->shost_state);
 183
 184         if (!name)
 185                 return -EINVAL;
 186
 187         return snprintf(buf, 20, "%s\n", name);
 188 }
 189
 190 static CLASS_DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state);
 191
 192 shost_rd_attr(unique_id, "%u\n");
 193 shost_rd_attr(host_busy, "%hu\n");
 194 shost_rd_attr(cmd_per_lun, "%hd\n");
 195 shost_rd_attr(sg_tablesize, "%hu\n");
 196 shost_rd_attr(unchecked_isa_dma, "%d\n");
 197 shost_rd_attr2(proc_name, hostt->proc_name, "%s\n");
 198
 199 static struct class_device_attribute *scsi_sysfs_shost_attrs[] = {
 200         &class_device_attr_unique_id,
 201         &class_device_attr_host_busy,
 202         &class_device_attr_cmd_per_lun,
 203         &class_device_attr_sg_tablesize,
 204         &class_device_attr_unchecked_isa_dma,
 205         &class_device_attr_proc_name,
 206         &class_device_attr_scan,
 207         &class_device_attr_state,
 208         NULL
 209 };
 210
 211 static void scsi_device_cls_release(struct class_device *class_dev)
 212 {
 213         struct scsi_device *sdev;
 214
 215         sdev = class_to_sdev(class_dev);
 216         put_device(&sdev->sdev_gendev);
 217 }
 218
 219 static void scsi_device_dev_release_usercontext(void *data)
 220 {
 221         struct device *dev = data;
 222         struct scsi_device *sdev;
 223         struct device *parent;
 224         struct scsi_target *starget;
 225         unsigned long flags;
 226
 227         parent = dev->parent;
 228         sdev = to_scsi_device(dev);
 229         starget = to_scsi_target(parent);
 230
 231         spin_lock_irqsave(sdev->host->host_lock, flags);
 232         starget->reap_ref++;
 233         list_del(&sdev->siblings);
 234         list_del(&sdev->same_target_siblings);
 235         list_del(&sdev->starved_entry);
 236         spin_unlock_irqrestore(sdev->host->host_lock, flags);
 237
 238         if (sdev->request_queue) {
 239                 sdev->request_queue->queuedata = NULL;
 240                 /* user context needed to free queue */
 241                 scsi_free_queue(sdev->request_queue);
 242                 /* temporary expedient, try to catch use of queue lock
 243                  * after free of sdev */
 244                 sdev->request_queue = NULL;
 245         }
 246
 247         scsi_target_reap(scsi_target(sdev));
 248
 249         kfree(sdev->inquiry);
 250         kfree(sdev);
 251
 252         if (parent)
 253                 put_device(parent);
 254 }
 255
 256 static void scsi_device_dev_release(struct device *dev)
 257 {
 258         struct scsi_device *sdp = to_scsi_device(dev);
 259         execute_in_process_context(scsi_device_dev_release_usercontext, dev,
 260                                    &sdp->ew);
 261 }
 262
 263 static struct class sdev_class = {
 264         .name           = "scsi_device",
 265         .release        = scsi_device_cls_release,
 266 };
 267
 268 /* all probing is done in the individual ->probe routines */
 269 static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
 270 {
 271         struct scsi_device *sdp = to_scsi_device(dev);
 272         if (sdp->no_uld_attach)
 273                 return 0;
 274         return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
 275 }
 276
 277 static int scsi_bus_suspend(struct device * dev, pm_message_t state)
 278 {
 279         struct scsi_device *sdev = to_scsi_device(dev);
 280         struct scsi_host_template *sht = sdev->host->hostt;
 281         int err;
 282
 283         err = scsi_device_quiesce(sdev);
 284         if (err)
 285                 return err;
 286
 287         if (sht->suspend)
 288                 err = sht->suspend(sdev, state);
 289
 290         return err;
 291 }
 292
 293 static int scsi_bus_resume(struct device * dev)
 294 {
 295         struct scsi_device *sdev = to_scsi_device(dev);
 296         struct scsi_host_template *sht = sdev->host->hostt;
 297         int err = 0;
 298
 299         if (sht->resume)
 300                 err = sht->resume(sdev);
 301
 302         scsi_device_resume(sdev);
 303         return err;
 304 }
 305
 306 struct bus_type scsi_bus_type = {
 307         .name           = "scsi",
 308         .match          = scsi_bus_match,
 309         .suspend        = scsi_bus_suspend,
 310         .resume         = scsi_bus_resume,
 311 };
 312
 313 int scsi_sysfs_register(void)
 314 {
 315         int error;
 316
 317         error = bus_register(&scsi_bus_type);
 318         if (!error) {
 319                 error = class_register(&sdev_class);
 320                 if (error)
 321                         bus_unregister(&scsi_bus_type);
 322         }
 323
 324         return error;
 325 }
 326
 327 void scsi_sysfs_unregister(void)
 328 {
 329         class_unregister(&sdev_class);
 330         bus_unregister(&scsi_bus_type);
 331 }
 332
 333 /*
 334  * sdev_show_function: macro to create an attr function that can be used to
 335  * show a non-bit field.
 336  */
 337 #define sdev_show_function(field, format_string)                                \
 338 static ssize_t                                                          \
 339 sdev_show_##field (struct device *dev, struct device_attribute *attr, char *buf)                                \
 340 {                                                                       \
 341         struct scsi_device *sdev;                                       \
 342         sdev = to_scsi_device(dev);                                     \
 343         return snprintf (buf, 20, format_string, sdev->field);          \
 344 }                                                                       \
 345
 346 /*
 347  * sdev_rd_attr: macro to create a function and attribute variable for a
 348  * read only field.
 349  */
 350 #define sdev_rd_attr(field, format_string)                              \
 351         sdev_show_function(field, format_string)                        \
 352 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
 353
 354
 355 /*
 356  * sdev_rd_attr: create a function and attribute variable for a
 357  * read/write field.
 358  */
 359 #define sdev_rw_attr(field, format_string)                              \
 360         sdev_show_function(field, format_string)                                \
 361                                                                         \
 362 static ssize_t                                                          \
 363 sdev_store_##field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)   \
 364 {                                                                       \
 365         struct scsi_device *sdev;                                       \
 366         sdev = to_scsi_device(dev);                                     \
 367         snscanf (buf, 20, format_string, &sdev->field);                 \
 368         return count;                                                   \
 369 }                                                                       \
 370 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 371
 372 /* Currently we don't export bit fields, but we might in future,
 373  * so leave this code in */
 374 #if 0
 375 /*
 376  * sdev_rd_attr: create a function and attribute variable for a
 377  * read/write bit field.
 378  */
 379 #define sdev_rw_attr_bit(field)                                         \
 380         sdev_show_function(field, "%d\n")                                       \
 381                                                                         \
 382 static ssize_t                                                          \
 383 sdev_store_##field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)   \
 384 {                                                                       \
 385         int ret;                                                        \
 386         struct scsi_device *sdev;                                       \
 387         ret = scsi_sdev_check_buf_bit(buf);                             \
 388         if (ret >= 0)   {                                               \
 389                 sdev = to_scsi_device(dev);                             \
 390                 sdev->field = ret;                                      \
 391                 ret = count;                                            \
 392         }                                                               \
 393         return ret;                                                     \
 394 }                                                                       \
 395 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 396
 397 /*
 398  * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
 399  * else return -EINVAL.
 400  */
 401 static int scsi_sdev_check_buf_bit(const char *buf)
 402 {
 403         if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
 404                 if (buf[0] == '1')
 405                         return 1;
 406                 else if (buf[0] == '0')
 407                         return 0;
 408                 else
 409                         return -EINVAL;
 410         } else
 411                 return -EINVAL;
 412 }
 413 #endif
 414 /*
 415  * Create the actual show/store functions and data structures.
 416  */
 417 sdev_rd_attr (device_blocked, "%d\n");
 418 sdev_rd_attr (queue_depth, "%d\n");
 419 sdev_rd_attr (type, "%d\n");
 420 sdev_rd_attr (scsi_level, "%d\n");
 421 sdev_rd_attr (vendor, "%.8s\n");
 422 sdev_rd_attr (model, "%.16s\n");
 423 sdev_rd_attr (rev, "%.4s\n");
 424
 425 static ssize_t
 426 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
 427 {
 428         struct scsi_device *sdev;
 429         sdev = to_scsi_device(dev);
 430         return snprintf (buf, 20, "%d\n", sdev->timeout / HZ);
 431 }
 432
 433 static ssize_t
 434 sdev_store_timeout (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 435 {
 436         struct scsi_device *sdev;
 437         int timeout;
 438         sdev = to_scsi_device(dev);
 439         sscanf (buf, "%d\n", &timeout);
 440         sdev->timeout = timeout * HZ;
 441         return count;
 442 }
 443 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
 444
 445 static ssize_t
 446 store_rescan_field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 447 {
 448         scsi_rescan_device(dev);
 449         return count;
 450 }
 451 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
 452
 453 static ssize_t sdev_store_delete(struct device *dev, struct device_attribute *attr, const char *buf,
 454                                  size_t count)
 455 {
 456         scsi_remove_device(to_scsi_device(dev));
 457         return count;
 458 };
 459 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
 460
 461 static ssize_t
 462 store_state_field(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 463 {
 464         int i;
 465         struct scsi_device *sdev = to_scsi_device(dev);
 466         enum scsi_device_state state = 0;
 467
 468         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
 469                 const int len = strlen(sdev_states[i].name);
 470                 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
 471                    buf[len] == '\n') {
 472                         state = sdev_states[i].value;
 473                         break;
 474                 }
 475         }
 476         if (!state)
 477                 return -EINVAL;
 478
 479         if (scsi_device_set_state(sdev, state))
 480                 return -EINVAL;
 481         return count;
 482 }
 483
 484 static ssize_t
 485 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
 486 {
 487         struct scsi_device *sdev = to_scsi_device(dev);
 488         const char *name = scsi_device_state_name(sdev->sdev_state);
 489
 490         if (!name)
 491                 return -EINVAL;
 492
 493         return snprintf(buf, 20, "%s\n", name);
 494 }
 495
 496 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
 497
 498 static ssize_t
 499 show_queue_type_field(struct device *dev, struct device_attribute *attr, char *buf)
 500 {
 501         struct scsi_device *sdev = to_scsi_device(dev);
 502         const char *name = "none";
 503
 504         if (sdev->ordered_tags)
 505                 name = "ordered";
 506         else if (sdev->simple_tags)
 507                 name = "simple";
 508
 509         return snprintf(buf, 20, "%s\n", name);
 510 }
 511
 512 static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL);
 513
 514 static ssize_t
 515 show_iostat_counterbits(struct device *dev, struct device_attribute *attr, char *buf)
 516 {
 517         return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
 518 }
 519
 520 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
 521
 522 #define show_sdev_iostat(field)                                         \
 523 static ssize_t                                                          \
 524 show_iostat_##field(struct device *dev, struct device_attribute *attr, char *buf)                       \
 525 {                                                                       \
 526         struct scsi_device *sdev = to_scsi_device(dev);                 \
 527         unsigned long long count = atomic_read(&sdev->field);           \
 528         return snprintf(buf, 20, "0x%llx\n", count);                    \
 529 }                                                                       \
 530 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
 531
 532 show_sdev_iostat(iorequest_cnt);
 533 show_sdev_iostat(iodone_cnt);
 534 show_sdev_iostat(ioerr_cnt);
 535
 536
 537 /* Default template for device attributes.  May NOT be modified */
 538 static struct device_attribute *scsi_sysfs_sdev_attrs[] = {
 539         &dev_attr_device_blocked,
 540         &dev_attr_queue_depth,
 541         &dev_attr_queue_type,
 542         &dev_attr_type,
 543         &dev_attr_scsi_level,
 544         &dev_attr_vendor,
 545         &dev_attr_model,
 546         &dev_attr_rev,
 547         &dev_attr_rescan,
 548         &dev_attr_delete,
 549         &dev_attr_state,
 550         &dev_attr_timeout,
 551         &dev_attr_iocounterbits,
 552         &dev_attr_iorequest_cnt,
 553         &dev_attr_iodone_cnt,
 554         &dev_attr_ioerr_cnt,
 555         NULL
 556 };
 557
 558 static ssize_t sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr, const char *buf,
 559                                          size_t count)
 560 {
 561         int depth, retval;
 562         struct scsi_device *sdev = to_scsi_device(dev);
 563         struct scsi_host_template *sht = sdev->host->hostt;
 564
 565         if (!sht->change_queue_depth)
 566                 return -EINVAL;
 567
 568         depth = simple_strtoul(buf, NULL, 0);
 569
 570         if (depth < 1)
 571                 return -EINVAL;
 572
 573         retval = sht->change_queue_depth(sdev, depth);
 574         if (retval < 0)
 575                 return retval;
 576
 577         return count;
 578 }
 579
 580 static struct device_attribute sdev_attr_queue_depth_rw =
 581         __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
 582                sdev_store_queue_depth_rw);
 583
 584 static ssize_t sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr, const char *buf,
 585                                         size_t count)
 586 {
 587         struct scsi_device *sdev = to_scsi_device(dev);
 588         struct scsi_host_template *sht = sdev->host->hostt;
 589         int tag_type = 0, retval;
 590         int prev_tag_type = scsi_get_tag_type(sdev);
 591
 592         if (!sdev->tagged_supported || !sht->change_queue_type)
 593                 return -EINVAL;
 594
 595         if (strncmp(buf, "ordered", 7) == 0)
 596                 tag_type = MSG_ORDERED_TAG;
 597         else if (strncmp(buf, "simple", 6) == 0)
 598                 tag_type = MSG_SIMPLE_TAG;
 599         else if (strncmp(buf, "none", 4) != 0)
 600                 return -EINVAL;
 601
 602         if (tag_type == prev_tag_type)
 603                 return count;
 604
 605         retval = sht->change_queue_type(sdev, tag_type);
 606         if (retval < 0)
 607                 return retval;
 608
 609         return count;
 610 }
 611
 612 static struct device_attribute sdev_attr_queue_type_rw =
 613         __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
 614                sdev_store_queue_type_rw);
 615
 616 static struct device_attribute *attr_changed_internally(
 617                 struct Scsi_Host *shost,
 618                 struct device_attribute * attr)
 619 {
 620         if (!strcmp("queue_depth", attr->attr.name)
 621             && shost->hostt->change_queue_depth)
 622                 return &sdev_attr_queue_depth_rw;
 623         else if (!strcmp("queue_type", attr->attr.name)
 624             && shost->hostt->change_queue_type)
 625                 return &sdev_attr_queue_type_rw;
 626         return attr;
 627 }
 628
 629
 630 static struct device_attribute *attr_overridden(
 631                 struct device_attribute **attrs,
 632                 struct device_attribute *attr)
 633 {
 634         int i;
 635
 636         if (!attrs)
 637                 return NULL;
 638         for (i = 0; attrs[i]; i++)
 639                 if (!strcmp(attrs[i]->attr.name, attr->attr.name))
 640                         return attrs[i];
 641         return NULL;
 642 }
 643
 644 static int attr_add(struct device *dev, struct device_attribute *attr)
 645 {
 646         struct device_attribute *base_attr;
 647
 648         /*
 649          * Spare the caller from having to copy things it's not interested in.
 650          */
 651         base_attr = attr_overridden(scsi_sysfs_sdev_attrs, attr);
 652         if (base_attr) {
 653                 /* extend permissions */
 654                 attr->attr.mode |= base_attr->attr.mode;
 655
 656                 /* override null show/store with default */
 657                 if (!attr->show)
 658                         attr->show = base_attr->show;
 659                 if (!attr->store)
 660                         attr->store = base_attr->store;
 661         }
 662
 663         return device_create_file(dev, attr);
 664 }
 665
 666 /**
 667  * scsi_sysfs_add_sdev - add scsi device to sysfs
 668  * @sdev:       scsi_device to add
 669  *
 670  * Return value:
 671  *      0 on Success / non-zero on Failure
 672  **/
 673 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
 674 {
 675         int error, i;
 676
 677         if ((error = scsi_device_set_state(sdev, SDEV_RUNNING)) != 0)
 678                 return error;
 679
 680         error = device_add(&sdev->sdev_gendev);
 681         if (error) {
 682                 put_device(sdev->sdev_gendev.parent);
 683                 printk(KERN_INFO "error 1\n");
 684                 return error;
 685         }
 686         error = class_device_add(&sdev->sdev_classdev);
 687         if (error) {
 688                 printk(KERN_INFO "error 2\n");
 689                 goto clean_device;
 690         }
 691
 692         /* take a reference for the sdev_classdev; this is
 693          * released by the sdev_class .release */
 694         get_device(&sdev->sdev_gendev);
 695         if (sdev->host->hostt->sdev_attrs) {
 696                 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
 697                         error = attr_add(&sdev->sdev_gendev,
 698                                         sdev->host->hostt->sdev_attrs[i]);
 699                         if (error) {
 700                                 __scsi_remove_device(sdev);
 701                                 goto out;
 702                         }
 703                 }
 704         }
 705
 706         for (i = 0; scsi_sysfs_sdev_attrs[i]; i++) {
 707                 if (!attr_overridden(sdev->host->hostt->sdev_attrs,
 708                                         scsi_sysfs_sdev_attrs[i])) {
 709                         struct device_attribute * attr =
 710                                 attr_changed_internally(sdev->host,
 711                                                         scsi_sysfs_sdev_attrs[i]);
 712                         error = device_create_file(&sdev->sdev_gendev, attr);
 713                         if (error) {
 714                                 __scsi_remove_device(sdev);
 715                                 goto out;
 716                         }
 717                 }
 718         }
 719
 720         transport_add_device(&sdev->sdev_gendev);
 721  out:
 722         return error;
 723
 724  clean_device:
 725         scsi_device_set_state(sdev, SDEV_CANCEL);
 726
 727         device_del(&sdev->sdev_gendev);
 728         transport_destroy_device(&sdev->sdev_gendev);
 729         put_device(&sdev->sdev_gendev);
 730
 731         return error;
 732 }
 733
 734 void __scsi_remove_device(struct scsi_device *sdev)
 735 {
 736         struct device *dev = &sdev->sdev_gendev;
 737
 738         if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
 739                 return;
 740
 741         class_device_unregister(&sdev->sdev_classdev);
 742         transport_remove_device(dev);
 743         device_del(dev);
 744         scsi_device_set_state(sdev, SDEV_DEL);
 745         if (sdev->host->hostt->slave_destroy)
 746                 sdev->host->hostt->slave_destroy(sdev);
 747         transport_destroy_device(dev);
 748         put_device(dev);
 749 }
 750
 751 /**
 752  * scsi_remove_device - unregister a device from the scsi bus
 753  * @sdev:       scsi_device to unregister
 754  **/
 755 void scsi_remove_device(struct scsi_device *sdev)
 756 {
 757         struct Scsi_Host *shost = sdev->host;
 758
 759         mutex_lock(&shost->scan_mutex);
 760         __scsi_remove_device(sdev);
 761         mutex_unlock(&shost->scan_mutex);
 762 }
 763 EXPORT_SYMBOL(scsi_remove_device);
 764
 765 void __scsi_remove_target(struct scsi_target *starget)
 766 {
 767         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 768         unsigned long flags;
 769         struct scsi_device *sdev;
 770
 771         spin_lock_irqsave(shost->host_lock, flags);
 772         starget->reap_ref++;
 773  restart:
 774         list_for_each_entry(sdev, &shost->__devices, siblings) {
 775                 if (sdev->channel != starget->channel ||
 776                     sdev->id != starget->id ||
 777                     sdev->sdev_state == SDEV_DEL)
 778                         continue;
 779                 spin_unlock_irqrestore(shost->host_lock, flags);
 780                 scsi_remove_device(sdev);
 781                 spin_lock_irqsave(shost->host_lock, flags);
 782                 goto restart;
 783         }
 784         spin_unlock_irqrestore(shost->host_lock, flags);
 785         scsi_target_reap(starget);
 786 }
 787
 788 static int __remove_child (struct device * dev, void * data)
 789 {
 790         if (scsi_is_target_device(dev))
 791                 __scsi_remove_target(to_scsi_target(dev));
 792         return 0;
 793 }
 794
 795 /**
 796  * scsi_remove_target - try to remove a target and all its devices
 797  * @dev: generic starget or parent of generic stargets to be removed
 798  *
 799  * Note: This is slightly racy.  It is possible that if the user
 800  * requests the addition of another device then the target won't be
 801  * removed.
 802  */
 803 void scsi_remove_target(struct device *dev)
 804 {
 805         struct device *rdev;
 806
 807         if (scsi_is_target_device(dev)) {
 808                 __scsi_remove_target(to_scsi_target(dev));
 809                 return;
 810         }
 811
 812         rdev = get_device(dev);
 813         device_for_each_child(dev, NULL, __remove_child);
 814         put_device(rdev);
 815 }
 816 EXPORT_SYMBOL(scsi_remove_target);
 817
 818 int scsi_register_driver(struct device_driver *drv)
 819 {
 820         drv->bus = &scsi_bus_type;
 821
 822         return driver_register(drv);
 823 }
 824 EXPORT_SYMBOL(scsi_register_driver);
 825
 826 int scsi_register_interface(struct class_interface *intf)
 827 {
 828         intf->class = &sdev_class;
 829
 830         return class_interface_register(intf);
 831 }
 832 EXPORT_SYMBOL(scsi_register_interface);
 833
 834
 835 static struct class_device_attribute *class_attr_overridden(
 836                 struct class_device_attribute **attrs,
 837                 struct class_device_attribute *attr)
 838 {
 839         int i;
 840
 841         if (!attrs)
 842                 return NULL;
 843         for (i = 0; attrs[i]; i++)
 844                 if (!strcmp(attrs[i]->attr.name, attr->attr.name))
 845                         return attrs[i];
 846         return NULL;
 847 }
 848
 849 static int class_attr_add(struct class_device *classdev,
 850                 struct class_device_attribute *attr)
 851 {
 852         struct class_device_attribute *base_attr;
 853
 854         /*
 855          * Spare the caller from having to copy things it's not interested in.
 856          */
 857         base_attr = class_attr_overridden(scsi_sysfs_shost_attrs, attr);
 858         if (base_attr) {
 859                 /* extend permissions */
 860                 attr->attr.mode |= base_attr->attr.mode;
 861
 862                 /* override null show/store with default */
 863                 if (!attr->show)
 864                         attr->show = base_attr->show;
 865                 if (!attr->store)
 866                         attr->store = base_attr->store;
 867         }
 868
 869         return class_device_create_file(classdev, attr);
 870 }
 871
 872 /**
 873  * scsi_sysfs_add_host - add scsi host to subsystem
 874  * @shost:     scsi host struct to add to subsystem
 875  * @dev:       parent struct device pointer
 876  **/
 877 int scsi_sysfs_add_host(struct Scsi_Host *shost)
 878 {
 879         int error, i;
 880
 881         if (shost->hostt->shost_attrs) {
 882                 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
 883                         error = class_attr_add(&shost->shost_classdev,
 884                                         shost->hostt->shost_attrs[i]);
 885                         if (error)
 886                                 return error;
 887                 }
 888         }
 889
 890         for (i = 0; scsi_sysfs_shost_attrs[i]; i++) {
 891                 if (!class_attr_overridden(shost->hostt->shost_attrs,
 892                                         scsi_sysfs_shost_attrs[i])) {
 893                         error = class_device_create_file(&shost->shost_classdev,
 894                                         scsi_sysfs_shost_attrs[i]);
 895                         if (error)
 896                                 return error;
 897                 }
 898         }
 899
 900         transport_register_device(&shost->shost_gendev);
 901         return 0;
 902 }
 903
 904 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
 905 {
 906         unsigned long flags;
 907         struct Scsi_Host *shost = sdev->host;
 908         struct scsi_target  *starget = sdev->sdev_target;
 909
 910         device_initialize(&sdev->sdev_gendev);
 911         sdev->sdev_gendev.bus = &scsi_bus_type;
 912         sdev->sdev_gendev.release = scsi_device_dev_release;
 913         sprintf(sdev->sdev_gendev.bus_id,"%d:%d:%d:%d",
 914                 sdev->host->host_no, sdev->channel, sdev->id,
 915                 sdev->lun);
 916
 917         class_device_initialize(&sdev->sdev_classdev);
 918         sdev->sdev_classdev.dev = &sdev->sdev_gendev;
 919         sdev->sdev_classdev.class = &sdev_class;
 920         snprintf(sdev->sdev_classdev.class_id, BUS_ID_SIZE,
 921                  "%d:%d:%d:%d", sdev->host->host_no,
 922                  sdev->channel, sdev->id, sdev->lun);
 923         sdev->scsi_level = SCSI_2;
 924         transport_setup_device(&sdev->sdev_gendev);
 925         spin_lock_irqsave(shost->host_lock, flags);
 926         list_add_tail(&sdev->same_target_siblings, &starget->devices);
 927         list_add_tail(&sdev->siblings, &shost->__devices);
 928         spin_unlock_irqrestore(shost->host_lock, flags);
 929 }
 930
 931 int scsi_is_sdev_device(const struct device *dev)
 932 {
 933         return dev->release == scsi_device_dev_release;
 934 }
 935 EXPORT_SYMBOL(scsi_is_sdev_device);
 936
 937 /* A blank transport template that is used in drivers that don't
 938  * yet implement Transport Attributes */
 939 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };