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