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 #include <scsi/scsi_driver.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(can_queue, "%hd\n");
 197 shost_rd_attr(sg_tablesize, "%hu\n");
 198 shost_rd_attr(unchecked_isa_dma, "%d\n");
 199 shost_rd_attr2(proc_name, hostt->proc_name, "%s\n");
 200
 201 static struct class_device_attribute *scsi_sysfs_shost_attrs[] = {
 202         &class_device_attr_unique_id,
 203         &class_device_attr_host_busy,
 204         &class_device_attr_cmd_per_lun,
 205         &class_device_attr_can_queue,
 206         &class_device_attr_sg_tablesize,
 207         &class_device_attr_unchecked_isa_dma,
 208         &class_device_attr_proc_name,
 209         &class_device_attr_scan,
 210         &class_device_attr_state,
 211         NULL
 212 };
 213
 214 static void scsi_device_cls_release(struct class_device *class_dev)
 215 {
 216         struct scsi_device *sdev;
 217
 218         sdev = class_to_sdev(class_dev);
 219         put_device(&sdev->sdev_gendev);
 220 }
 221
 222 static void scsi_device_dev_release_usercontext(struct work_struct *work)
 223 {
 224         struct scsi_device *sdev;
 225         struct device *parent;
 226         struct scsi_target *starget;
 227         unsigned long flags;
 228
 229         sdev = container_of(work, struct scsi_device, ew.work);
 230
 231         parent = sdev->sdev_gendev.parent;
 232         starget = to_scsi_target(parent);
 233
 234         spin_lock_irqsave(sdev->host->host_lock, flags);
 235         starget->reap_ref++;
 236         list_del(&sdev->siblings);
 237         list_del(&sdev->same_target_siblings);
 238         list_del(&sdev->starved_entry);
 239         spin_unlock_irqrestore(sdev->host->host_lock, flags);
 240
 241         if (sdev->request_queue) {
 242                 sdev->request_queue->queuedata = NULL;
 243                 /* user context needed to free queue */
 244                 scsi_free_queue(sdev->request_queue);
 245                 /* temporary expedient, try to catch use of queue lock
 246                  * after free of sdev */
 247                 sdev->request_queue = NULL;
 248         }
 249
 250         scsi_target_reap(scsi_target(sdev));
 251
 252         kfree(sdev->inquiry);
 253         kfree(sdev);
 254
 255         if (parent)
 256                 put_device(parent);
 257 }
 258
 259 static void scsi_device_dev_release(struct device *dev)
 260 {
 261         struct scsi_device *sdp = to_scsi_device(dev);
 262         execute_in_process_context(scsi_device_dev_release_usercontext,
 263                                    &sdp->ew);
 264 }
 265
 266 static struct class sdev_class = {
 267         .name           = "scsi_device",
 268         .release        = scsi_device_cls_release,
 269 };
 270
 271 /* all probing is done in the individual ->probe routines */
 272 static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
 273 {
 274         struct scsi_device *sdp = to_scsi_device(dev);
 275         if (sdp->no_uld_attach)
 276                 return 0;
 277         return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
 278 }
 279
 280 static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
 281 {
 282         struct scsi_device *sdev = to_scsi_device(dev);
 283
 284         add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
 285         return 0;
 286 }
 287
 288 static int scsi_bus_suspend(struct device * dev, pm_message_t state)
 289 {
 290         struct device_driver *drv = dev->driver;
 291         struct scsi_device *sdev = to_scsi_device(dev);
 292         int err;
 293
 294         err = scsi_device_quiesce(sdev);
 295         if (err)
 296                 return err;
 297
 298         if (drv && drv->suspend) {
 299                 err = drv->suspend(dev, state);
 300                 if (err)
 301                         return err;
 302         }
 303
 304         return 0;
 305 }
 306
 307 static int scsi_bus_resume(struct device * dev)
 308 {
 309         struct device_driver *drv = dev->driver;
 310         struct scsi_device *sdev = to_scsi_device(dev);
 311         int err = 0;
 312
 313         if (drv && drv->resume)
 314                 err = drv->resume(dev);
 315
 316         scsi_device_resume(sdev);
 317
 318         return err;
 319 }
 320
 321 struct bus_type scsi_bus_type = {
 322         .name           = "scsi",
 323         .match          = scsi_bus_match,
 324         .uevent         = scsi_bus_uevent,
 325         .suspend        = scsi_bus_suspend,
 326         .resume         = scsi_bus_resume,
 327 };
 328
 329 int scsi_sysfs_register(void)
 330 {
 331         int error;
 332
 333         error = bus_register(&scsi_bus_type);
 334         if (!error) {
 335                 error = class_register(&sdev_class);
 336                 if (error)
 337                         bus_unregister(&scsi_bus_type);
 338         }
 339
 340         return error;
 341 }
 342
 343 void scsi_sysfs_unregister(void)
 344 {
 345         class_unregister(&sdev_class);
 346         bus_unregister(&scsi_bus_type);
 347 }
 348
 349 /*
 350  * sdev_show_function: macro to create an attr function that can be used to
 351  * show a non-bit field.
 352  */
 353 #define sdev_show_function(field, format_string)                                \
 354 static ssize_t                                                          \
 355 sdev_show_##field (struct device *dev, struct device_attribute *attr, char *buf)                                \
 356 {                                                                       \
 357         struct scsi_device *sdev;                                       \
 358         sdev = to_scsi_device(dev);                                     \
 359         return snprintf (buf, 20, format_string, sdev->field);          \
 360 }                                                                       \
 361
 362 /*
 363  * sdev_rd_attr: macro to create a function and attribute variable for a
 364  * read only field.
 365  */
 366 #define sdev_rd_attr(field, format_string)                              \
 367         sdev_show_function(field, format_string)                        \
 368 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
 369
 370
 371 /*
 372  * sdev_rd_attr: create a function and attribute variable for a
 373  * read/write field.
 374  */
 375 #define sdev_rw_attr(field, format_string)                              \
 376         sdev_show_function(field, format_string)                                \
 377                                                                         \
 378 static ssize_t                                                          \
 379 sdev_store_##field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)   \
 380 {                                                                       \
 381         struct scsi_device *sdev;                                       \
 382         sdev = to_scsi_device(dev);                                     \
 383         snscanf (buf, 20, format_string, &sdev->field);                 \
 384         return count;                                                   \
 385 }                                                                       \
 386 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 387
 388 /* Currently we don't export bit fields, but we might in future,
 389  * so leave this code in */
 390 #if 0
 391 /*
 392  * sdev_rd_attr: create a function and attribute variable for a
 393  * read/write bit field.
 394  */
 395 #define sdev_rw_attr_bit(field)                                         \
 396         sdev_show_function(field, "%d\n")                                       \
 397                                                                         \
 398 static ssize_t                                                          \
 399 sdev_store_##field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)   \
 400 {                                                                       \
 401         int ret;                                                        \
 402         struct scsi_device *sdev;                                       \
 403         ret = scsi_sdev_check_buf_bit(buf);                             \
 404         if (ret >= 0)   {                                               \
 405                 sdev = to_scsi_device(dev);                             \
 406                 sdev->field = ret;                                      \
 407                 ret = count;                                            \
 408         }                                                               \
 409         return ret;                                                     \
 410 }                                                                       \
 411 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 412
 413 /*
 414  * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
 415  * else return -EINVAL.
 416  */
 417 static int scsi_sdev_check_buf_bit(const char *buf)
 418 {
 419         if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
 420                 if (buf[0] == '1')
 421                         return 1;
 422                 else if (buf[0] == '0')
 423                         return 0;
 424                 else
 425                         return -EINVAL;
 426         } else
 427                 return -EINVAL;
 428 }
 429 #endif
 430 /*
 431  * Create the actual show/store functions and data structures.
 432  */
 433 sdev_rd_attr (device_blocked, "%d\n");
 434 sdev_rd_attr (queue_depth, "%d\n");
 435 sdev_rd_attr (type, "%d\n");
 436 sdev_rd_attr (scsi_level, "%d\n");
 437 sdev_rd_attr (vendor, "%.8s\n");
 438 sdev_rd_attr (model, "%.16s\n");
 439 sdev_rd_attr (rev, "%.4s\n");
 440
 441 static ssize_t
 442 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
 443 {
 444         struct scsi_device *sdev;
 445         sdev = to_scsi_device(dev);
 446         return snprintf (buf, 20, "%d\n", sdev->timeout / HZ);
 447 }
 448
 449 static ssize_t
 450 sdev_store_timeout (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 451 {
 452         struct scsi_device *sdev;
 453         int timeout;
 454         sdev = to_scsi_device(dev);
 455         sscanf (buf, "%d\n", &timeout);
 456         sdev->timeout = timeout * HZ;
 457         return count;
 458 }
 459 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
 460
 461 static ssize_t
 462 store_rescan_field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 463 {
 464         scsi_rescan_device(dev);
 465         return count;
 466 }
 467 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
 468
 469 static void sdev_store_delete_callback(struct device *dev)
 470 {
 471         scsi_remove_device(to_scsi_device(dev));
 472 }
 473
 474 static ssize_t sdev_store_delete(struct device *dev, struct device_attribute *attr, const char *buf,
 475                                  size_t count)
 476 {
 477         int rc;
 478
 479         /* An attribute cannot be unregistered by one of its own methods,
 480          * so we have to use this roundabout approach.
 481          */
 482         rc = device_schedule_callback(dev, sdev_store_delete_callback);
 483         if (rc)
 484                 count = rc;
 485         return count;
 486 };
 487 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
 488
 489 static ssize_t
 490 store_state_field(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 491 {
 492         int i;
 493         struct scsi_device *sdev = to_scsi_device(dev);
 494         enum scsi_device_state state = 0;
 495
 496         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
 497                 const int len = strlen(sdev_states[i].name);
 498                 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
 499                    buf[len] == '\n') {
 500                         state = sdev_states[i].value;
 501                         break;
 502                 }
 503         }
 504         if (!state)
 505                 return -EINVAL;
 506
 507         if (scsi_device_set_state(sdev, state))
 508                 return -EINVAL;
 509         return count;
 510 }
 511
 512 static ssize_t
 513 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
 514 {
 515         struct scsi_device *sdev = to_scsi_device(dev);
 516         const char *name = scsi_device_state_name(sdev->sdev_state);
 517
 518         if (!name)
 519                 return -EINVAL;
 520
 521         return snprintf(buf, 20, "%s\n", name);
 522 }
 523
 524 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
 525
 526 static ssize_t
 527 show_queue_type_field(struct device *dev, struct device_attribute *attr, char *buf)
 528 {
 529         struct scsi_device *sdev = to_scsi_device(dev);
 530         const char *name = "none";
 531
 532         if (sdev->ordered_tags)
 533                 name = "ordered";
 534         else if (sdev->simple_tags)
 535                 name = "simple";
 536
 537         return snprintf(buf, 20, "%s\n", name);
 538 }
 539
 540 static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL);
 541
 542 static ssize_t
 543 show_iostat_counterbits(struct device *dev, struct device_attribute *attr, char *buf)
 544 {
 545         return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
 546 }
 547
 548 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
 549
 550 #define show_sdev_iostat(field)                                         \
 551 static ssize_t                                                          \
 552 show_iostat_##field(struct device *dev, struct device_attribute *attr, char *buf)                       \
 553 {                                                                       \
 554         struct scsi_device *sdev = to_scsi_device(dev);                 \
 555         unsigned long long count = atomic_read(&sdev->field);           \
 556         return snprintf(buf, 20, "0x%llx\n", count);                    \
 557 }                                                                       \
 558 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
 559
 560 show_sdev_iostat(iorequest_cnt);
 561 show_sdev_iostat(iodone_cnt);
 562 show_sdev_iostat(ioerr_cnt);
 563
 564 static ssize_t
 565 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
 566 {
 567         struct scsi_device *sdev;
 568         sdev = to_scsi_device(dev);
 569         return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
 570 }
 571 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
 572
 573 /* Default template for device attributes.  May NOT be modified */
 574 static struct device_attribute *scsi_sysfs_sdev_attrs[] = {
 575         &dev_attr_device_blocked,
 576         &dev_attr_queue_depth,
 577         &dev_attr_queue_type,
 578         &dev_attr_type,
 579         &dev_attr_scsi_level,
 580         &dev_attr_vendor,
 581         &dev_attr_model,
 582         &dev_attr_rev,
 583         &dev_attr_rescan,
 584         &dev_attr_delete,
 585         &dev_attr_state,
 586         &dev_attr_timeout,
 587         &dev_attr_iocounterbits,
 588         &dev_attr_iorequest_cnt,
 589         &dev_attr_iodone_cnt,
 590         &dev_attr_ioerr_cnt,
 591         &dev_attr_modalias,
 592         NULL
 593 };
 594
 595 static ssize_t sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr, const char *buf,
 596                                          size_t count)
 597 {
 598         int depth, retval;
 599         struct scsi_device *sdev = to_scsi_device(dev);
 600         struct scsi_host_template *sht = sdev->host->hostt;
 601
 602         if (!sht->change_queue_depth)
 603                 return -EINVAL;
 604
 605         depth = simple_strtoul(buf, NULL, 0);
 606
 607         if (depth < 1)
 608                 return -EINVAL;
 609
 610         retval = sht->change_queue_depth(sdev, depth);
 611         if (retval < 0)
 612                 return retval;
 613
 614         return count;
 615 }
 616
 617 static struct device_attribute sdev_attr_queue_depth_rw =
 618         __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
 619                sdev_store_queue_depth_rw);
 620
 621 static ssize_t sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr, const char *buf,
 622                                         size_t count)
 623 {
 624         struct scsi_device *sdev = to_scsi_device(dev);
 625         struct scsi_host_template *sht = sdev->host->hostt;
 626         int tag_type = 0, retval;
 627         int prev_tag_type = scsi_get_tag_type(sdev);
 628
 629         if (!sdev->tagged_supported || !sht->change_queue_type)
 630                 return -EINVAL;
 631
 632         if (strncmp(buf, "ordered", 7) == 0)
 633                 tag_type = MSG_ORDERED_TAG;
 634         else if (strncmp(buf, "simple", 6) == 0)
 635                 tag_type = MSG_SIMPLE_TAG;
 636         else if (strncmp(buf, "none", 4) != 0)
 637                 return -EINVAL;
 638
 639         if (tag_type == prev_tag_type)
 640                 return count;
 641
 642         retval = sht->change_queue_type(sdev, tag_type);
 643         if (retval < 0)
 644                 return retval;
 645
 646         return count;
 647 }
 648
 649 static struct device_attribute sdev_attr_queue_type_rw =
 650         __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
 651                sdev_store_queue_type_rw);
 652
 653 static struct device_attribute *attr_changed_internally(
 654                 struct Scsi_Host *shost,
 655                 struct device_attribute * attr)
 656 {
 657         if (!strcmp("queue_depth", attr->attr.name)
 658             && shost->hostt->change_queue_depth)
 659                 return &sdev_attr_queue_depth_rw;
 660         else if (!strcmp("queue_type", attr->attr.name)
 661             && shost->hostt->change_queue_type)
 662                 return &sdev_attr_queue_type_rw;
 663         return attr;
 664 }
 665
 666
 667 static struct device_attribute *attr_overridden(
 668                 struct device_attribute **attrs,
 669                 struct device_attribute *attr)
 670 {
 671         int i;
 672
 673         if (!attrs)
 674                 return NULL;
 675         for (i = 0; attrs[i]; i++)
 676                 if (!strcmp(attrs[i]->attr.name, attr->attr.name))
 677                         return attrs[i];
 678         return NULL;
 679 }
 680
 681 static int attr_add(struct device *dev, struct device_attribute *attr)
 682 {
 683         struct device_attribute *base_attr;
 684
 685         /*
 686          * Spare the caller from having to copy things it's not interested in.
 687          */
 688         base_attr = attr_overridden(scsi_sysfs_sdev_attrs, attr);
 689         if (base_attr) {
 690                 /* extend permissions */
 691                 attr->attr.mode |= base_attr->attr.mode;
 692
 693                 /* override null show/store with default */
 694                 if (!attr->show)
 695                         attr->show = base_attr->show;
 696                 if (!attr->store)
 697                         attr->store = base_attr->store;
 698         }
 699
 700         return device_create_file(dev, attr);
 701 }
 702
 703 /**
 704  * scsi_sysfs_add_sdev - add scsi device to sysfs
 705  * @sdev:       scsi_device to add
 706  *
 707  * Return value:
 708  *      0 on Success / non-zero on Failure
 709  **/
 710 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
 711 {
 712         int error, i;
 713         struct request_queue *rq = sdev->request_queue;
 714
 715         if ((error = scsi_device_set_state(sdev, SDEV_RUNNING)) != 0)
 716                 return error;
 717
 718         error = device_add(&sdev->sdev_gendev);
 719         if (error) {
 720                 put_device(sdev->sdev_gendev.parent);
 721                 printk(KERN_INFO "error 1\n");
 722                 return error;
 723         }
 724         error = class_device_add(&sdev->sdev_classdev);
 725         if (error) {
 726                 printk(KERN_INFO "error 2\n");
 727                 goto clean_device;
 728         }
 729
 730         /* take a reference for the sdev_classdev; this is
 731          * released by the sdev_class .release */
 732         get_device(&sdev->sdev_gendev);
 733
 734         error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL);
 735
 736         if (error)
 737                 sdev_printk(KERN_INFO, sdev,
 738                             "Failed to register bsg queue, errno=%d\n", error);
 739
 740         /* we're treating error on bsg register as non-fatal, so pretend
 741          * nothing went wrong */
 742         error = 0;
 743
 744         if (sdev->host->hostt->sdev_attrs) {
 745                 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
 746                         error = attr_add(&sdev->sdev_gendev,
 747                                         sdev->host->hostt->sdev_attrs[i]);
 748                         if (error) {
 749                                 __scsi_remove_device(sdev);
 750                                 goto out;
 751                         }
 752                 }
 753         }
 754
 755         for (i = 0; scsi_sysfs_sdev_attrs[i]; i++) {
 756                 if (!attr_overridden(sdev->host->hostt->sdev_attrs,
 757                                         scsi_sysfs_sdev_attrs[i])) {
 758                         struct device_attribute * attr =
 759                                 attr_changed_internally(sdev->host,
 760                                                         scsi_sysfs_sdev_attrs[i]);
 761                         error = device_create_file(&sdev->sdev_gendev, attr);
 762                         if (error) {
 763                                 __scsi_remove_device(sdev);
 764                                 goto out;
 765                         }
 766                 }
 767         }
 768
 769         transport_add_device(&sdev->sdev_gendev);
 770  out:
 771         return error;
 772
 773  clean_device:
 774         scsi_device_set_state(sdev, SDEV_CANCEL);
 775
 776         device_del(&sdev->sdev_gendev);
 777         transport_destroy_device(&sdev->sdev_gendev);
 778         put_device(&sdev->sdev_gendev);
 779
 780         return error;
 781 }
 782
 783 void __scsi_remove_device(struct scsi_device *sdev)
 784 {
 785         struct device *dev = &sdev->sdev_gendev;
 786
 787         if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
 788                 return;
 789
 790         bsg_unregister_queue(sdev->request_queue);
 791         class_device_unregister(&sdev->sdev_classdev);
 792         transport_remove_device(dev);
 793         device_del(dev);
 794         scsi_device_set_state(sdev, SDEV_DEL);
 795         if (sdev->host->hostt->slave_destroy)
 796                 sdev->host->hostt->slave_destroy(sdev);
 797         transport_destroy_device(dev);
 798         put_device(dev);
 799 }
 800
 801 /**
 802  * scsi_remove_device - unregister a device from the scsi bus
 803  * @sdev:       scsi_device to unregister
 804  **/
 805 void scsi_remove_device(struct scsi_device *sdev)
 806 {
 807         struct Scsi_Host *shost = sdev->host;
 808
 809         mutex_lock(&shost->scan_mutex);
 810         __scsi_remove_device(sdev);
 811         mutex_unlock(&shost->scan_mutex);
 812 }
 813 EXPORT_SYMBOL(scsi_remove_device);
 814
 815 static void __scsi_remove_target(struct scsi_target *starget)
 816 {
 817         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 818         unsigned long flags;
 819         struct scsi_device *sdev;
 820
 821         spin_lock_irqsave(shost->host_lock, flags);
 822         starget->reap_ref++;
 823  restart:
 824         list_for_each_entry(sdev, &shost->__devices, siblings) {
 825                 if (sdev->channel != starget->channel ||
 826                     sdev->id != starget->id ||
 827                     sdev->sdev_state == SDEV_DEL)
 828                         continue;
 829                 spin_unlock_irqrestore(shost->host_lock, flags);
 830                 scsi_remove_device(sdev);
 831                 spin_lock_irqsave(shost->host_lock, flags);
 832                 goto restart;
 833         }
 834         spin_unlock_irqrestore(shost->host_lock, flags);
 835         scsi_target_reap(starget);
 836 }
 837
 838 static int __remove_child (struct device * dev, void * data)
 839 {
 840         if (scsi_is_target_device(dev))
 841                 __scsi_remove_target(to_scsi_target(dev));
 842         return 0;
 843 }
 844
 845 /**
 846  * scsi_remove_target - try to remove a target and all its devices
 847  * @dev: generic starget or parent of generic stargets to be removed
 848  *
 849  * Note: This is slightly racy.  It is possible that if the user
 850  * requests the addition of another device then the target won't be
 851  * removed.
 852  */
 853 void scsi_remove_target(struct device *dev)
 854 {
 855         struct device *rdev;
 856
 857         if (scsi_is_target_device(dev)) {
 858                 __scsi_remove_target(to_scsi_target(dev));
 859                 return;
 860         }
 861
 862         rdev = get_device(dev);
 863         device_for_each_child(dev, NULL, __remove_child);
 864         put_device(rdev);
 865 }
 866 EXPORT_SYMBOL(scsi_remove_target);
 867
 868 int scsi_register_driver(struct device_driver *drv)
 869 {
 870         drv->bus = &scsi_bus_type;
 871
 872         return driver_register(drv);
 873 }
 874 EXPORT_SYMBOL(scsi_register_driver);
 875
 876 int scsi_register_interface(struct class_interface *intf)
 877 {
 878         intf->class = &sdev_class;
 879
 880         return class_interface_register(intf);
 881 }
 882 EXPORT_SYMBOL(scsi_register_interface);
 883
 884
 885 static struct class_device_attribute *class_attr_overridden(
 886                 struct class_device_attribute **attrs,
 887                 struct class_device_attribute *attr)
 888 {
 889         int i;
 890
 891         if (!attrs)
 892                 return NULL;
 893         for (i = 0; attrs[i]; i++)
 894                 if (!strcmp(attrs[i]->attr.name, attr->attr.name))
 895                         return attrs[i];
 896         return NULL;
 897 }
 898
 899 static int class_attr_add(struct class_device *classdev,
 900                 struct class_device_attribute *attr)
 901 {
 902         struct class_device_attribute *base_attr;
 903
 904         /*
 905          * Spare the caller from having to copy things it's not interested in.
 906          */
 907         base_attr = class_attr_overridden(scsi_sysfs_shost_attrs, attr);
 908         if (base_attr) {
 909                 /* extend permissions */
 910                 attr->attr.mode |= base_attr->attr.mode;
 911
 912                 /* override null show/store with default */
 913                 if (!attr->show)
 914                         attr->show = base_attr->show;
 915                 if (!attr->store)
 916                         attr->store = base_attr->store;
 917         }
 918
 919         return class_device_create_file(classdev, attr);
 920 }
 921
 922 /**
 923  * scsi_sysfs_add_host - add scsi host to subsystem
 924  * @shost:     scsi host struct to add to subsystem
 925  * @dev:       parent struct device pointer
 926  **/
 927 int scsi_sysfs_add_host(struct Scsi_Host *shost)
 928 {
 929         int error, i;
 930
 931         if (shost->hostt->shost_attrs) {
 932                 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
 933                         error = class_attr_add(&shost->shost_classdev,
 934                                         shost->hostt->shost_attrs[i]);
 935                         if (error)
 936                                 return error;
 937                 }
 938         }
 939
 940         for (i = 0; scsi_sysfs_shost_attrs[i]; i++) {
 941                 if (!class_attr_overridden(shost->hostt->shost_attrs,
 942                                         scsi_sysfs_shost_attrs[i])) {
 943                         error = class_device_create_file(&shost->shost_classdev,
 944                                         scsi_sysfs_shost_attrs[i]);
 945                         if (error)
 946                                 return error;
 947                 }
 948         }
 949
 950         transport_register_device(&shost->shost_gendev);
 951         return 0;
 952 }
 953
 954 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
 955 {
 956         unsigned long flags;
 957         struct Scsi_Host *shost = sdev->host;
 958         struct scsi_target  *starget = sdev->sdev_target;
 959
 960         device_initialize(&sdev->sdev_gendev);
 961         sdev->sdev_gendev.bus = &scsi_bus_type;
 962         sdev->sdev_gendev.release = scsi_device_dev_release;
 963         sprintf(sdev->sdev_gendev.bus_id,"%d:%d:%d:%d",
 964                 sdev->host->host_no, sdev->channel, sdev->id,
 965                 sdev->lun);
 966
 967         class_device_initialize(&sdev->sdev_classdev);
 968         sdev->sdev_classdev.dev = &sdev->sdev_gendev;
 969         sdev->sdev_classdev.class = &sdev_class;
 970         snprintf(sdev->sdev_classdev.class_id, BUS_ID_SIZE,
 971                  "%d:%d:%d:%d", sdev->host->host_no,
 972                  sdev->channel, sdev->id, sdev->lun);
 973         sdev->scsi_level = starget->scsi_level;
 974         transport_setup_device(&sdev->sdev_gendev);
 975         spin_lock_irqsave(shost->host_lock, flags);
 976         list_add_tail(&sdev->same_target_siblings, &starget->devices);
 977         list_add_tail(&sdev->siblings, &shost->__devices);
 978         spin_unlock_irqrestore(shost->host_lock, flags);
 979 }
 980
 981 int scsi_is_sdev_device(const struct device *dev)
 982 {
 983         return dev->release == scsi_device_dev_release;
 984 }
 985 EXPORT_SYMBOL(scsi_is_sdev_device);
 986
 987 /* A blank transport template that is used in drivers that don't
 988  * yet implement Transport Attributes */
 989 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };