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(can_queue, "%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_can_queue,
 205         &class_device_attr_sg_tablesize,
 206         &class_device_attr_unchecked_isa_dma,
 207         &class_device_attr_proc_name,
 208         &class_device_attr_scan,
 209         &class_device_attr_state,
 210         NULL
 211 };
 212
 213 static void scsi_device_cls_release(struct class_device *class_dev)
 214 {
 215         struct scsi_device *sdev;
 216
 217         sdev = class_to_sdev(class_dev);
 218         put_device(&sdev->sdev_gendev);
 219 }
 220
 221 static void scsi_device_dev_release_usercontext(struct work_struct *work)
 222 {
 223         struct scsi_device *sdev;
 224         struct device *parent;
 225         struct scsi_target *starget;
 226         unsigned long flags;
 227
 228         sdev = container_of(work, struct scsi_device, ew.work);
 229
 230         parent = sdev->sdev_gendev.parent;
 231         starget = to_scsi_target(parent);
 232
 233         spin_lock_irqsave(sdev->host->host_lock, flags);
 234         starget->reap_ref++;
 235         list_del(&sdev->siblings);
 236         list_del(&sdev->same_target_siblings);
 237         list_del(&sdev->starved_entry);
 238         spin_unlock_irqrestore(sdev->host->host_lock, flags);
 239
 240         if (sdev->request_queue) {
 241                 sdev->request_queue->queuedata = NULL;
 242                 /* user context needed to free queue */
 243                 scsi_free_queue(sdev->request_queue);
 244                 /* temporary expedient, try to catch use of queue lock
 245                  * after free of sdev */
 246                 sdev->request_queue = NULL;
 247         }
 248
 249         scsi_target_reap(scsi_target(sdev));
 250
 251         kfree(sdev->inquiry);
 252         kfree(sdev);
 253
 254         if (parent)
 255                 put_device(parent);
 256 }
 257
 258 static void scsi_device_dev_release(struct device *dev)
 259 {
 260         struct scsi_device *sdp = to_scsi_device(dev);
 261         execute_in_process_context(scsi_device_dev_release_usercontext,
 262                                    &sdp->ew);
 263 }
 264
 265 static struct class sdev_class = {
 266         .name           = "scsi_device",
 267         .release        = scsi_device_cls_release,
 268 };
 269
 270 /* all probing is done in the individual ->probe routines */
 271 static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
 272 {
 273         struct scsi_device *sdp = to_scsi_device(dev);
 274         if (sdp->no_uld_attach)
 275                 return 0;
 276         return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
 277 }
 278
 279 static int scsi_bus_suspend(struct device * dev, pm_message_t state)
 280 {
 281         struct device_driver *drv = dev->driver;
 282         struct scsi_device *sdev = to_scsi_device(dev);
 283         struct scsi_host_template *sht = sdev->host->hostt;
 284         int err;
 285
 286         err = scsi_device_quiesce(sdev);
 287         if (err)
 288                 return err;
 289
 290         /* call HLD suspend first */
 291         if (drv && drv->suspend) {
 292                 err = drv->suspend(dev, state);
 293                 if (err)
 294                         return err;
 295         }
 296
 297         /* then, call host suspend */
 298         if (sht->suspend) {
 299                 err = sht->suspend(sdev, state);
 300                 if (err) {
 301                         if (drv && drv->resume)
 302                                 drv->resume(dev);
 303                         return err;
 304                 }
 305         }
 306
 307         return 0;
 308 }
 309
 310 static int scsi_bus_resume(struct device * dev)
 311 {
 312         struct device_driver *drv = dev->driver;
 313         struct scsi_device *sdev = to_scsi_device(dev);
 314         struct scsi_host_template *sht = sdev->host->hostt;
 315         int err = 0, err2 = 0;
 316
 317         /* call host resume first */
 318         if (sht->resume)
 319                 err = sht->resume(sdev);
 320
 321         /* then, call HLD resume */
 322         if (drv && drv->resume)
 323                 err2 = drv->resume(dev);
 324
 325         scsi_device_resume(sdev);
 326
 327         /* favor LLD failure */
 328         return err ? err : err2;;
 329 }
 330
 331 struct bus_type scsi_bus_type = {
 332         .name           = "scsi",
 333         .match          = scsi_bus_match,
 334         .suspend        = scsi_bus_suspend,
 335         .resume         = scsi_bus_resume,
 336 };
 337
 338 int scsi_sysfs_register(void)
 339 {
 340         int error;
 341
 342         error = bus_register(&scsi_bus_type);
 343         if (!error) {
 344                 error = class_register(&sdev_class);
 345                 if (error)
 346                         bus_unregister(&scsi_bus_type);
 347         }
 348
 349         return error;
 350 }
 351
 352 void scsi_sysfs_unregister(void)
 353 {
 354         class_unregister(&sdev_class);
 355         bus_unregister(&scsi_bus_type);
 356 }
 357
 358 /*
 359  * sdev_show_function: macro to create an attr function that can be used to
 360  * show a non-bit field.
 361  */
 362 #define sdev_show_function(field, format_string)                                \
 363 static ssize_t                                                          \
 364 sdev_show_##field (struct device *dev, struct device_attribute *attr, char *buf)                                \
 365 {                                                                       \
 366         struct scsi_device *sdev;                                       \
 367         sdev = to_scsi_device(dev);                                     \
 368         return snprintf (buf, 20, format_string, sdev->field);          \
 369 }                                                                       \
 370
 371 /*
 372  * sdev_rd_attr: macro to create a function and attribute variable for a
 373  * read only field.
 374  */
 375 #define sdev_rd_attr(field, format_string)                              \
 376         sdev_show_function(field, format_string)                        \
 377 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
 378
 379
 380 /*
 381  * sdev_rd_attr: create a function and attribute variable for a
 382  * read/write field.
 383  */
 384 #define sdev_rw_attr(field, format_string)                              \
 385         sdev_show_function(field, format_string)                                \
 386                                                                         \
 387 static ssize_t                                                          \
 388 sdev_store_##field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)   \
 389 {                                                                       \
 390         struct scsi_device *sdev;                                       \
 391         sdev = to_scsi_device(dev);                                     \
 392         snscanf (buf, 20, format_string, &sdev->field);                 \
 393         return count;                                                   \
 394 }                                                                       \
 395 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 396
 397 /* Currently we don't export bit fields, but we might in future,
 398  * so leave this code in */
 399 #if 0
 400 /*
 401  * sdev_rd_attr: create a function and attribute variable for a
 402  * read/write bit field.
 403  */
 404 #define sdev_rw_attr_bit(field)                                         \
 405         sdev_show_function(field, "%d\n")                                       \
 406                                                                         \
 407 static ssize_t                                                          \
 408 sdev_store_##field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)   \
 409 {                                                                       \
 410         int ret;                                                        \
 411         struct scsi_device *sdev;                                       \
 412         ret = scsi_sdev_check_buf_bit(buf);                             \
 413         if (ret >= 0)   {                                               \
 414                 sdev = to_scsi_device(dev);                             \
 415                 sdev->field = ret;                                      \
 416                 ret = count;                                            \
 417         }                                                               \
 418         return ret;                                                     \
 419 }                                                                       \
 420 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 421
 422 /*
 423  * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
 424  * else return -EINVAL.
 425  */
 426 static int scsi_sdev_check_buf_bit(const char *buf)
 427 {
 428         if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
 429                 if (buf[0] == '1')
 430                         return 1;
 431                 else if (buf[0] == '0')
 432                         return 0;
 433                 else
 434                         return -EINVAL;
 435         } else
 436                 return -EINVAL;
 437 }
 438 #endif
 439 /*
 440  * Create the actual show/store functions and data structures.
 441  */
 442 sdev_rd_attr (device_blocked, "%d\n");
 443 sdev_rd_attr (queue_depth, "%d\n");
 444 sdev_rd_attr (type, "%d\n");
 445 sdev_rd_attr (scsi_level, "%d\n");
 446 sdev_rd_attr (vendor, "%.8s\n");
 447 sdev_rd_attr (model, "%.16s\n");
 448 sdev_rd_attr (rev, "%.4s\n");
 449
 450 static ssize_t
 451 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
 452 {
 453         struct scsi_device *sdev;
 454         sdev = to_scsi_device(dev);
 455         return snprintf (buf, 20, "%d\n", sdev->timeout / HZ);
 456 }
 457
 458 static ssize_t
 459 sdev_store_timeout (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 460 {
 461         struct scsi_device *sdev;
 462         int timeout;
 463         sdev = to_scsi_device(dev);
 464         sscanf (buf, "%d\n", &timeout);
 465         sdev->timeout = timeout * HZ;
 466         return count;
 467 }
 468 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
 469
 470 static ssize_t
 471 store_rescan_field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 472 {
 473         scsi_rescan_device(dev);
 474         return count;
 475 }
 476 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
 477
 478 static ssize_t sdev_store_delete(struct device *dev, struct device_attribute *attr, const char *buf,
 479                                  size_t count)
 480 {
 481         scsi_remove_device(to_scsi_device(dev));
 482         return count;
 483 };
 484 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
 485
 486 static ssize_t
 487 store_state_field(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 488 {
 489         int i;
 490         struct scsi_device *sdev = to_scsi_device(dev);
 491         enum scsi_device_state state = 0;
 492
 493         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
 494                 const int len = strlen(sdev_states[i].name);
 495                 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
 496                    buf[len] == '\n') {
 497                         state = sdev_states[i].value;
 498                         break;
 499                 }
 500         }
 501         if (!state)
 502                 return -EINVAL;
 503
 504         if (scsi_device_set_state(sdev, state))
 505                 return -EINVAL;
 506         return count;
 507 }
 508
 509 static ssize_t
 510 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
 511 {
 512         struct scsi_device *sdev = to_scsi_device(dev);
 513         const char *name = scsi_device_state_name(sdev->sdev_state);
 514
 515         if (!name)
 516                 return -EINVAL;
 517
 518         return snprintf(buf, 20, "%s\n", name);
 519 }
 520
 521 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
 522
 523 static ssize_t
 524 show_queue_type_field(struct device *dev, struct device_attribute *attr, char *buf)
 525 {
 526         struct scsi_device *sdev = to_scsi_device(dev);
 527         const char *name = "none";
 528
 529         if (sdev->ordered_tags)
 530                 name = "ordered";
 531         else if (sdev->simple_tags)
 532                 name = "simple";
 533
 534         return snprintf(buf, 20, "%s\n", name);
 535 }
 536
 537 static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL);
 538
 539 static ssize_t
 540 show_iostat_counterbits(struct device *dev, struct device_attribute *attr, char *buf)
 541 {
 542         return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
 543 }
 544
 545 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
 546
 547 #define show_sdev_iostat(field)                                         \
 548 static ssize_t                                                          \
 549 show_iostat_##field(struct device *dev, struct device_attribute *attr, char *buf)                       \
 550 {                                                                       \
 551         struct scsi_device *sdev = to_scsi_device(dev);                 \
 552         unsigned long long count = atomic_read(&sdev->field);           \
 553         return snprintf(buf, 20, "0x%llx\n", count);                    \
 554 }                                                                       \
 555 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
 556
 557 show_sdev_iostat(iorequest_cnt);
 558 show_sdev_iostat(iodone_cnt);
 559 show_sdev_iostat(ioerr_cnt);
 560
 561
 562 /* Default template for device attributes.  May NOT be modified */
 563 static struct device_attribute *scsi_sysfs_sdev_attrs[] = {
 564         &dev_attr_device_blocked,
 565         &dev_attr_queue_depth,
 566         &dev_attr_queue_type,
 567         &dev_attr_type,
 568         &dev_attr_scsi_level,
 569         &dev_attr_vendor,
 570         &dev_attr_model,
 571         &dev_attr_rev,
 572         &dev_attr_rescan,
 573         &dev_attr_delete,
 574         &dev_attr_state,
 575         &dev_attr_timeout,
 576         &dev_attr_iocounterbits,
 577         &dev_attr_iorequest_cnt,
 578         &dev_attr_iodone_cnt,
 579         &dev_attr_ioerr_cnt,
 580         NULL
 581 };
 582
 583 static ssize_t sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr, const char *buf,
 584                                          size_t count)
 585 {
 586         int depth, retval;
 587         struct scsi_device *sdev = to_scsi_device(dev);
 588         struct scsi_host_template *sht = sdev->host->hostt;
 589
 590         if (!sht->change_queue_depth)
 591                 return -EINVAL;
 592
 593         depth = simple_strtoul(buf, NULL, 0);
 594
 595         if (depth < 1)
 596                 return -EINVAL;
 597
 598         retval = sht->change_queue_depth(sdev, depth);
 599         if (retval < 0)
 600                 return retval;
 601
 602         return count;
 603 }
 604
 605 static struct device_attribute sdev_attr_queue_depth_rw =
 606         __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
 607                sdev_store_queue_depth_rw);
 608
 609 static ssize_t sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr, const char *buf,
 610                                         size_t count)
 611 {
 612         struct scsi_device *sdev = to_scsi_device(dev);
 613         struct scsi_host_template *sht = sdev->host->hostt;
 614         int tag_type = 0, retval;
 615         int prev_tag_type = scsi_get_tag_type(sdev);
 616
 617         if (!sdev->tagged_supported || !sht->change_queue_type)
 618                 return -EINVAL;
 619
 620         if (strncmp(buf, "ordered", 7) == 0)
 621                 tag_type = MSG_ORDERED_TAG;
 622         else if (strncmp(buf, "simple", 6) == 0)
 623                 tag_type = MSG_SIMPLE_TAG;
 624         else if (strncmp(buf, "none", 4) != 0)
 625                 return -EINVAL;
 626
 627         if (tag_type == prev_tag_type)
 628                 return count;
 629
 630         retval = sht->change_queue_type(sdev, tag_type);
 631         if (retval < 0)
 632                 return retval;
 633
 634         return count;
 635 }
 636
 637 static struct device_attribute sdev_attr_queue_type_rw =
 638         __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
 639                sdev_store_queue_type_rw);
 640
 641 static struct device_attribute *attr_changed_internally(
 642                 struct Scsi_Host *shost,
 643                 struct device_attribute * attr)
 644 {
 645         if (!strcmp("queue_depth", attr->attr.name)
 646             && shost->hostt->change_queue_depth)
 647                 return &sdev_attr_queue_depth_rw;
 648         else if (!strcmp("queue_type", attr->attr.name)
 649             && shost->hostt->change_queue_type)
 650                 return &sdev_attr_queue_type_rw;
 651         return attr;
 652 }
 653
 654
 655 static struct device_attribute *attr_overridden(
 656                 struct device_attribute **attrs,
 657                 struct device_attribute *attr)
 658 {
 659         int i;
 660
 661         if (!attrs)
 662                 return NULL;
 663         for (i = 0; attrs[i]; i++)
 664                 if (!strcmp(attrs[i]->attr.name, attr->attr.name))
 665                         return attrs[i];
 666         return NULL;
 667 }
 668
 669 static int attr_add(struct device *dev, struct device_attribute *attr)
 670 {
 671         struct device_attribute *base_attr;
 672
 673         /*
 674          * Spare the caller from having to copy things it's not interested in.
 675          */
 676         base_attr = attr_overridden(scsi_sysfs_sdev_attrs, attr);
 677         if (base_attr) {
 678                 /* extend permissions */
 679                 attr->attr.mode |= base_attr->attr.mode;
 680
 681                 /* override null show/store with default */
 682                 if (!attr->show)
 683                         attr->show = base_attr->show;
 684                 if (!attr->store)
 685                         attr->store = base_attr->store;
 686         }
 687
 688         return device_create_file(dev, attr);
 689 }
 690
 691 /**
 692  * scsi_sysfs_add_sdev - add scsi device to sysfs
 693  * @sdev:       scsi_device to add
 694  *
 695  * Return value:
 696  *      0 on Success / non-zero on Failure
 697  **/
 698 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
 699 {
 700         int error, i;
 701
 702         if ((error = scsi_device_set_state(sdev, SDEV_RUNNING)) != 0)
 703                 return error;
 704
 705         error = device_add(&sdev->sdev_gendev);
 706         if (error) {
 707                 put_device(sdev->sdev_gendev.parent);
 708                 printk(KERN_INFO "error 1\n");
 709                 return error;
 710         }
 711         error = class_device_add(&sdev->sdev_classdev);
 712         if (error) {
 713                 printk(KERN_INFO "error 2\n");
 714                 goto clean_device;
 715         }
 716
 717         /* take a reference for the sdev_classdev; this is
 718          * released by the sdev_class .release */
 719         get_device(&sdev->sdev_gendev);
 720         if (sdev->host->hostt->sdev_attrs) {
 721                 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
 722                         error = attr_add(&sdev->sdev_gendev,
 723                                         sdev->host->hostt->sdev_attrs[i]);
 724                         if (error) {
 725                                 __scsi_remove_device(sdev);
 726                                 goto out;
 727                         }
 728                 }
 729         }
 730
 731         for (i = 0; scsi_sysfs_sdev_attrs[i]; i++) {
 732                 if (!attr_overridden(sdev->host->hostt->sdev_attrs,
 733                                         scsi_sysfs_sdev_attrs[i])) {
 734                         struct device_attribute * attr =
 735                                 attr_changed_internally(sdev->host,
 736                                                         scsi_sysfs_sdev_attrs[i]);
 737                         error = device_create_file(&sdev->sdev_gendev, attr);
 738                         if (error) {
 739                                 __scsi_remove_device(sdev);
 740                                 goto out;
 741                         }
 742                 }
 743         }
 744
 745         transport_add_device(&sdev->sdev_gendev);
 746  out:
 747         return error;
 748
 749  clean_device:
 750         scsi_device_set_state(sdev, SDEV_CANCEL);
 751
 752         device_del(&sdev->sdev_gendev);
 753         transport_destroy_device(&sdev->sdev_gendev);
 754         put_device(&sdev->sdev_gendev);
 755
 756         return error;
 757 }
 758
 759 void __scsi_remove_device(struct scsi_device *sdev)
 760 {
 761         struct device *dev = &sdev->sdev_gendev;
 762
 763         if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
 764                 return;
 765
 766         class_device_unregister(&sdev->sdev_classdev);
 767         transport_remove_device(dev);
 768         device_del(dev);
 769         scsi_device_set_state(sdev, SDEV_DEL);
 770         if (sdev->host->hostt->slave_destroy)
 771                 sdev->host->hostt->slave_destroy(sdev);
 772         transport_destroy_device(dev);
 773         put_device(dev);
 774 }
 775
 776 /**
 777  * scsi_remove_device - unregister a device from the scsi bus
 778  * @sdev:       scsi_device to unregister
 779  **/
 780 void scsi_remove_device(struct scsi_device *sdev)
 781 {
 782         struct Scsi_Host *shost = sdev->host;
 783
 784         mutex_lock(&shost->scan_mutex);
 785         __scsi_remove_device(sdev);
 786         mutex_unlock(&shost->scan_mutex);
 787 }
 788 EXPORT_SYMBOL(scsi_remove_device);
 789
 790 void __scsi_remove_target(struct scsi_target *starget)
 791 {
 792         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 793         unsigned long flags;
 794         struct scsi_device *sdev;
 795
 796         spin_lock_irqsave(shost->host_lock, flags);
 797         starget->reap_ref++;
 798  restart:
 799         list_for_each_entry(sdev, &shost->__devices, siblings) {
 800                 if (sdev->channel != starget->channel ||
 801                     sdev->id != starget->id ||
 802                     sdev->sdev_state == SDEV_DEL)
 803                         continue;
 804                 spin_unlock_irqrestore(shost->host_lock, flags);
 805                 scsi_remove_device(sdev);
 806                 spin_lock_irqsave(shost->host_lock, flags);
 807                 goto restart;
 808         }
 809         spin_unlock_irqrestore(shost->host_lock, flags);
 810         scsi_target_reap(starget);
 811 }
 812
 813 static int __remove_child (struct device * dev, void * data)
 814 {
 815         if (scsi_is_target_device(dev))
 816                 __scsi_remove_target(to_scsi_target(dev));
 817         return 0;
 818 }
 819
 820 /**
 821  * scsi_remove_target - try to remove a target and all its devices
 822  * @dev: generic starget or parent of generic stargets to be removed
 823  *
 824  * Note: This is slightly racy.  It is possible that if the user
 825  * requests the addition of another device then the target won't be
 826  * removed.
 827  */
 828 void scsi_remove_target(struct device *dev)
 829 {
 830         struct device *rdev;
 831
 832         if (scsi_is_target_device(dev)) {
 833                 __scsi_remove_target(to_scsi_target(dev));
 834                 return;
 835         }
 836
 837         rdev = get_device(dev);
 838         device_for_each_child(dev, NULL, __remove_child);
 839         put_device(rdev);
 840 }
 841 EXPORT_SYMBOL(scsi_remove_target);
 842
 843 int scsi_register_driver(struct device_driver *drv)
 844 {
 845         drv->bus = &scsi_bus_type;
 846
 847         return driver_register(drv);
 848 }
 849 EXPORT_SYMBOL(scsi_register_driver);
 850
 851 int scsi_register_interface(struct class_interface *intf)
 852 {
 853         intf->class = &sdev_class;
 854
 855         return class_interface_register(intf);
 856 }
 857 EXPORT_SYMBOL(scsi_register_interface);
 858
 859
 860 static struct class_device_attribute *class_attr_overridden(
 861                 struct class_device_attribute **attrs,
 862                 struct class_device_attribute *attr)
 863 {
 864         int i;
 865
 866         if (!attrs)
 867                 return NULL;
 868         for (i = 0; attrs[i]; i++)
 869                 if (!strcmp(attrs[i]->attr.name, attr->attr.name))
 870                         return attrs[i];
 871         return NULL;
 872 }
 873
 874 static int class_attr_add(struct class_device *classdev,
 875                 struct class_device_attribute *attr)
 876 {
 877         struct class_device_attribute *base_attr;
 878
 879         /*
 880          * Spare the caller from having to copy things it's not interested in.
 881          */
 882         base_attr = class_attr_overridden(scsi_sysfs_shost_attrs, attr);
 883         if (base_attr) {
 884                 /* extend permissions */
 885                 attr->attr.mode |= base_attr->attr.mode;
 886
 887                 /* override null show/store with default */
 888                 if (!attr->show)
 889                         attr->show = base_attr->show;
 890                 if (!attr->store)
 891                         attr->store = base_attr->store;
 892         }
 893
 894         return class_device_create_file(classdev, attr);
 895 }
 896
 897 /**
 898  * scsi_sysfs_add_host - add scsi host to subsystem
 899  * @shost:     scsi host struct to add to subsystem
 900  * @dev:       parent struct device pointer
 901  **/
 902 int scsi_sysfs_add_host(struct Scsi_Host *shost)
 903 {
 904         int error, i;
 905
 906         if (shost->hostt->shost_attrs) {
 907                 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
 908                         error = class_attr_add(&shost->shost_classdev,
 909                                         shost->hostt->shost_attrs[i]);
 910                         if (error)
 911                                 return error;
 912                 }
 913         }
 914
 915         for (i = 0; scsi_sysfs_shost_attrs[i]; i++) {
 916                 if (!class_attr_overridden(shost->hostt->shost_attrs,
 917                                         scsi_sysfs_shost_attrs[i])) {
 918                         error = class_device_create_file(&shost->shost_classdev,
 919                                         scsi_sysfs_shost_attrs[i]);
 920                         if (error)
 921                                 return error;
 922                 }
 923         }
 924
 925         transport_register_device(&shost->shost_gendev);
 926         return 0;
 927 }
 928
 929 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
 930 {
 931         unsigned long flags;
 932         struct Scsi_Host *shost = sdev->host;
 933         struct scsi_target  *starget = sdev->sdev_target;
 934
 935         device_initialize(&sdev->sdev_gendev);
 936         sdev->sdev_gendev.bus = &scsi_bus_type;
 937         sdev->sdev_gendev.release = scsi_device_dev_release;
 938         sprintf(sdev->sdev_gendev.bus_id,"%d:%d:%d:%d",
 939                 sdev->host->host_no, sdev->channel, sdev->id,
 940                 sdev->lun);
 941
 942         class_device_initialize(&sdev->sdev_classdev);
 943         sdev->sdev_classdev.dev = &sdev->sdev_gendev;
 944         sdev->sdev_classdev.class = &sdev_class;
 945         snprintf(sdev->sdev_classdev.class_id, BUS_ID_SIZE,
 946                  "%d:%d:%d:%d", sdev->host->host_no,
 947                  sdev->channel, sdev->id, sdev->lun);
 948         sdev->scsi_level = starget->scsi_level;
 949         transport_setup_device(&sdev->sdev_gendev);
 950         spin_lock_irqsave(shost->host_lock, flags);
 951         list_add_tail(&sdev->same_target_siblings, &starget->devices);
 952         list_add_tail(&sdev->siblings, &shost->__devices);
 953         spin_unlock_irqrestore(shost->host_lock, flags);
 954 }
 955
 956 int scsi_is_sdev_device(const struct device *dev)
 957 {
 958         return dev->release == scsi_device_dev_release;
 959 }
 960 EXPORT_SYMBOL(scsi_is_sdev_device);
 961
 962 /* A blank transport template that is used in drivers that don't
 963  * yet implement Transport Attributes */
 964 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };