git.oblomov.eu Git - linux-2.6/blob - 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_uevent(struct device *dev, char **envp, int num_envp,
 280                            char *buffer, int buffer_size)
 281 {
 282         struct scsi_device *sdev = to_scsi_device(dev);
 283         int i = 0;
 284         int length = 0;
 285
 286         add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &length,
 287                        "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
 288         envp[i] = NULL;
 289         return 0;
 290 }
 291
 292 static int scsi_bus_suspend(struct device * dev, pm_message_t state)
 293 {
 294         struct device_driver *drv = dev->driver;
 295         struct scsi_device *sdev = to_scsi_device(dev);
 296         int err;
 297
 298         err = scsi_device_quiesce(sdev);
 299         if (err)
 300                 return err;
 301
 302         if (drv && drv->suspend) {
 303                 err = drv->suspend(dev, state);
 304                 if (err)
 305                         return err;
 306         }
 307
 308         return 0;
 309 }
 310
 311 static int scsi_bus_resume(struct device * dev)
 312 {
 313         struct device_driver *drv = dev->driver;
 314         struct scsi_device *sdev = to_scsi_device(dev);
 315         int err = 0;
 316
 317         if (drv && drv->resume)
 318                 err = drv->resume(dev);
 319
 320         scsi_device_resume(sdev);
 321
 322         return err;
 323 }
 324
 325 struct bus_type scsi_bus_type = {
 326         .name           = "scsi",
 327         .match          = scsi_bus_match,
 328         .uevent         = scsi_bus_uevent,
 329         .suspend        = scsi_bus_suspend,
 330         .resume         = scsi_bus_resume,
 331 };
 332
 333 int scsi_sysfs_register(void)
 334 {
 335         int error;
 336
 337         error = bus_register(&scsi_bus_type);
 338         if (!error) {
 339                 error = class_register(&sdev_class);
 340                 if (error)
 341                         bus_unregister(&scsi_bus_type);
 342         }
 343
 344         return error;
 345 }
 346
 347 void scsi_sysfs_unregister(void)
 348 {
 349         class_unregister(&sdev_class);
 350         bus_unregister(&scsi_bus_type);
 351 }
 352
 353 /*
 354  * sdev_show_function: macro to create an attr function that can be used to
 355  * show a non-bit field.
 356  */
 357 #define sdev_show_function(field, format_string)                                \
 358 static ssize_t                                                          \
 359 sdev_show_##field (struct device *dev, struct device_attribute *attr, char *buf)                                \
 360 {                                                                       \
 361         struct scsi_device *sdev;                                       \
 362         sdev = to_scsi_device(dev);                                     \
 363         return snprintf (buf, 20, format_string, sdev->field);          \
 364 }                                                                       \
 365
 366 /*
 367  * sdev_rd_attr: macro to create a function and attribute variable for a
 368  * read only field.
 369  */
 370 #define sdev_rd_attr(field, format_string)                              \
 371         sdev_show_function(field, format_string)                        \
 372 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
 373
 374
 375 /*
 376  * sdev_rd_attr: create a function and attribute variable for a
 377  * read/write field.
 378  */
 379 #define sdev_rw_attr(field, format_string)                              \
 380         sdev_show_function(field, format_string)                                \
 381                                                                         \
 382 static ssize_t                                                          \
 383 sdev_store_##field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)   \
 384 {                                                                       \
 385         struct scsi_device *sdev;                                       \
 386         sdev = to_scsi_device(dev);                                     \
 387         snscanf (buf, 20, format_string, &sdev->field);                 \
 388         return count;                                                   \
 389 }                                                                       \
 390 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 391
 392 /* Currently we don't export bit fields, but we might in future,
 393  * so leave this code in */
 394 #if 0
 395 /*
 396  * sdev_rd_attr: create a function and attribute variable for a
 397  * read/write bit field.
 398  */
 399 #define sdev_rw_attr_bit(field)                                         \
 400         sdev_show_function(field, "%d\n")                                       \
 401                                                                         \
 402 static ssize_t                                                          \
 403 sdev_store_##field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)   \
 404 {                                                                       \
 405         int ret;                                                        \
 406         struct scsi_device *sdev;                                       \
 407         ret = scsi_sdev_check_buf_bit(buf);                             \
 408         if (ret >= 0)   {                                               \
 409                 sdev = to_scsi_device(dev);                             \
 410                 sdev->field = ret;                                      \
 411                 ret = count;                                            \
 412         }                                                               \
 413         return ret;                                                     \
 414 }                                                                       \
 415 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 416
 417 /*
 418  * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
 419  * else return -EINVAL.
 420  */
 421 static int scsi_sdev_check_buf_bit(const char *buf)
 422 {
 423         if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
 424                 if (buf[0] == '1')
 425                         return 1;
 426                 else if (buf[0] == '0')
 427                         return 0;
 428                 else
 429                         return -EINVAL;
 430         } else
 431                 return -EINVAL;
 432 }
 433 #endif
 434 /*
 435  * Create the actual show/store functions and data structures.
 436  */
 437 sdev_rd_attr (device_blocked, "%d\n");
 438 sdev_rd_attr (queue_depth, "%d\n");
 439 sdev_rd_attr (type, "%d\n");
 440 sdev_rd_attr (scsi_level, "%d\n");
 441 sdev_rd_attr (vendor, "%.8s\n");
 442 sdev_rd_attr (model, "%.16s\n");
 443 sdev_rd_attr (rev, "%.4s\n");
 444
 445 static ssize_t
 446 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
 447 {
 448         struct scsi_device *sdev;
 449         sdev = to_scsi_device(dev);
 450         return snprintf (buf, 20, "%d\n", sdev->timeout / HZ);
 451 }
 452
 453 static ssize_t
 454 sdev_store_timeout (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 455 {
 456         struct scsi_device *sdev;
 457         int timeout;
 458         sdev = to_scsi_device(dev);
 459         sscanf (buf, "%d\n", &timeout);
 460         sdev->timeout = timeout * HZ;
 461         return count;
 462 }
 463 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
 464
 465 static ssize_t
 466 store_rescan_field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 467 {
 468         scsi_rescan_device(dev);
 469         return count;
 470 }
 471 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
 472
 473 static void sdev_store_delete_callback(struct device *dev)
 474 {
 475         scsi_remove_device(to_scsi_device(dev));
 476 }
 477
 478 static ssize_t sdev_store_delete(struct device *dev, struct device_attribute *attr, const char *buf,
 479                                  size_t count)
 480 {
 481         int rc;
 482
 483         /* An attribute cannot be unregistered by one of its own methods,
 484          * so we have to use this roundabout approach.
 485          */
 486         rc = device_schedule_callback(dev, sdev_store_delete_callback);
 487         if (rc)
 488                 count = rc;
 489         return count;
 490 };
 491 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
 492
 493 static ssize_t
 494 store_state_field(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 495 {
 496         int i;
 497         struct scsi_device *sdev = to_scsi_device(dev);
 498         enum scsi_device_state state = 0;
 499
 500         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
 501                 const int len = strlen(sdev_states[i].name);
 502                 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
 503                    buf[len] == '\n') {
 504                         state = sdev_states[i].value;
 505                         break;
 506                 }
 507         }
 508         if (!state)
 509                 return -EINVAL;
 510
 511         if (scsi_device_set_state(sdev, state))
 512                 return -EINVAL;
 513         return count;
 514 }
 515
 516 static ssize_t
 517 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
 518 {
 519         struct scsi_device *sdev = to_scsi_device(dev);
 520         const char *name = scsi_device_state_name(sdev->sdev_state);
 521
 522         if (!name)
 523                 return -EINVAL;
 524
 525         return snprintf(buf, 20, "%s\n", name);
 526 }
 527
 528 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
 529
 530 static ssize_t
 531 show_queue_type_field(struct device *dev, struct device_attribute *attr, char *buf)
 532 {
 533         struct scsi_device *sdev = to_scsi_device(dev);
 534         const char *name = "none";
 535
 536         if (sdev->ordered_tags)
 537                 name = "ordered";
 538         else if (sdev->simple_tags)
 539                 name = "simple";
 540
 541         return snprintf(buf, 20, "%s\n", name);
 542 }
 543
 544 static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL);
 545
 546 static ssize_t
 547 show_iostat_counterbits(struct device *dev, struct device_attribute *attr, char *buf)
 548 {
 549         return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
 550 }
 551
 552 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
 553
 554 #define show_sdev_iostat(field)                                         \
 555 static ssize_t                                                          \
 556 show_iostat_##field(struct device *dev, struct device_attribute *attr, char *buf)                       \
 557 {                                                                       \
 558         struct scsi_device *sdev = to_scsi_device(dev);                 \
 559         unsigned long long count = atomic_read(&sdev->field);           \
 560         return snprintf(buf, 20, "0x%llx\n", count);                    \
 561 }                                                                       \
 562 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
 563
 564 show_sdev_iostat(iorequest_cnt);
 565 show_sdev_iostat(iodone_cnt);
 566 show_sdev_iostat(ioerr_cnt);
 567
 568 static ssize_t
 569 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
 570 {
 571         struct scsi_device *sdev;
 572         sdev = to_scsi_device(dev);
 573         return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
 574 }
 575 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
 576
 577 /* Default template for device attributes.  May NOT be modified */
 578 static struct device_attribute *scsi_sysfs_sdev_attrs[] = {
 579         &dev_attr_device_blocked,
 580         &dev_attr_queue_depth,
 581         &dev_attr_queue_type,
 582         &dev_attr_type,
 583         &dev_attr_scsi_level,
 584         &dev_attr_vendor,
 585         &dev_attr_model,
 586         &dev_attr_rev,
 587         &dev_attr_rescan,
 588         &dev_attr_delete,
 589         &dev_attr_state,
 590         &dev_attr_timeout,
 591         &dev_attr_iocounterbits,
 592         &dev_attr_iorequest_cnt,
 593         &dev_attr_iodone_cnt,
 594         &dev_attr_ioerr_cnt,
 595         &dev_attr_modalias,
 596         NULL
 597 };
 598
 599 static ssize_t sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr, const char *buf,
 600                                          size_t count)
 601 {
 602         int depth, retval;
 603         struct scsi_device *sdev = to_scsi_device(dev);
 604         struct scsi_host_template *sht = sdev->host->hostt;
 605
 606         if (!sht->change_queue_depth)
 607                 return -EINVAL;
 608
 609         depth = simple_strtoul(buf, NULL, 0);
 610
 611         if (depth < 1)
 612                 return -EINVAL;
 613
 614         retval = sht->change_queue_depth(sdev, depth);
 615         if (retval < 0)
 616                 return retval;
 617
 618         return count;
 619 }
 620
 621 static struct device_attribute sdev_attr_queue_depth_rw =
 622         __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
 623                sdev_store_queue_depth_rw);
 624
 625 static ssize_t sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr, const char *buf,
 626                                         size_t count)
 627 {
 628         struct scsi_device *sdev = to_scsi_device(dev);
 629         struct scsi_host_template *sht = sdev->host->hostt;
 630         int tag_type = 0, retval;
 631         int prev_tag_type = scsi_get_tag_type(sdev);
 632
 633         if (!sdev->tagged_supported || !sht->change_queue_type)
 634                 return -EINVAL;
 635
 636         if (strncmp(buf, "ordered", 7) == 0)
 637                 tag_type = MSG_ORDERED_TAG;
 638         else if (strncmp(buf, "simple", 6) == 0)
 639                 tag_type = MSG_SIMPLE_TAG;
 640         else if (strncmp(buf, "none", 4) != 0)
 641                 return -EINVAL;
 642
 643         if (tag_type == prev_tag_type)
 644                 return count;
 645
 646         retval = sht->change_queue_type(sdev, tag_type);
 647         if (retval < 0)
 648                 return retval;
 649
 650         return count;
 651 }
 652
 653 static struct device_attribute sdev_attr_queue_type_rw =
 654         __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
 655                sdev_store_queue_type_rw);
 656
 657 static struct device_attribute *attr_changed_internally(
 658                 struct Scsi_Host *shost,
 659                 struct device_attribute * attr)
 660 {
 661         if (!strcmp("queue_depth", attr->attr.name)
 662             && shost->hostt->change_queue_depth)
 663                 return &sdev_attr_queue_depth_rw;
 664         else if (!strcmp("queue_type", attr->attr.name)
 665             && shost->hostt->change_queue_type)
 666                 return &sdev_attr_queue_type_rw;
 667         return attr;
 668 }
 669
 670
 671 static struct device_attribute *attr_overridden(
 672                 struct device_attribute **attrs,
 673                 struct device_attribute *attr)
 674 {
 675         int i;
 676
 677         if (!attrs)
 678                 return NULL;
 679         for (i = 0; attrs[i]; i++)
 680                 if (!strcmp(attrs[i]->attr.name, attr->attr.name))
 681                         return attrs[i];
 682         return NULL;
 683 }
 684
 685 static int attr_add(struct device *dev, struct device_attribute *attr)
 686 {
 687         struct device_attribute *base_attr;
 688
 689         /*
 690          * Spare the caller from having to copy things it's not interested in.
 691          */
 692         base_attr = attr_overridden(scsi_sysfs_sdev_attrs, attr);
 693         if (base_attr) {
 694                 /* extend permissions */
 695                 attr->attr.mode |= base_attr->attr.mode;
 696
 697                 /* override null show/store with default */
 698                 if (!attr->show)
 699                         attr->show = base_attr->show;
 700                 if (!attr->store)
 701                         attr->store = base_attr->store;
 702         }
 703
 704         return device_create_file(dev, attr);
 705 }
 706
 707 /**
 708  * scsi_sysfs_add_sdev - add scsi device to sysfs
 709  * @sdev:       scsi_device to add
 710  *
 711  * Return value:
 712  *      0 on Success / non-zero on Failure
 713  **/
 714 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
 715 {
 716         int error, i;
 717
 718         if ((error = scsi_device_set_state(sdev, SDEV_RUNNING)) != 0)
 719                 return error;
 720
 721         error = device_add(&sdev->sdev_gendev);
 722         if (error) {
 723                 put_device(sdev->sdev_gendev.parent);
 724                 printk(KERN_INFO "error 1\n");
 725                 return error;
 726         }
 727         error = class_device_add(&sdev->sdev_classdev);
 728         if (error) {
 729                 printk(KERN_INFO "error 2\n");
 730                 goto clean_device;
 731         }
 732
 733         /* take a reference for the sdev_classdev; this is
 734          * released by the sdev_class .release */
 735         get_device(&sdev->sdev_gendev);
 736         if (sdev->host->hostt->sdev_attrs) {
 737                 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
 738                         error = attr_add(&sdev->sdev_gendev,
 739                                         sdev->host->hostt->sdev_attrs[i]);
 740                         if (error) {
 741                                 __scsi_remove_device(sdev);
 742                                 goto out;
 743                         }
 744                 }
 745         }
 746
 747         for (i = 0; scsi_sysfs_sdev_attrs[i]; i++) {
 748                 if (!attr_overridden(sdev->host->hostt->sdev_attrs,
 749                                         scsi_sysfs_sdev_attrs[i])) {
 750                         struct device_attribute * attr =
 751                                 attr_changed_internally(sdev->host,
 752                                                         scsi_sysfs_sdev_attrs[i]);
 753                         error = device_create_file(&sdev->sdev_gendev, attr);
 754                         if (error) {
 755                                 __scsi_remove_device(sdev);
 756                                 goto out;
 757                         }
 758                 }
 759         }
 760
 761         transport_add_device(&sdev->sdev_gendev);
 762  out:
 763         return error;
 764
 765  clean_device:
 766         scsi_device_set_state(sdev, SDEV_CANCEL);
 767
 768         device_del(&sdev->sdev_gendev);
 769         transport_destroy_device(&sdev->sdev_gendev);
 770         put_device(&sdev->sdev_gendev);
 771
 772         return error;
 773 }
 774
 775 void __scsi_remove_device(struct scsi_device *sdev)
 776 {
 777         struct device *dev = &sdev->sdev_gendev;
 778
 779         if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
 780                 return;
 781
 782         class_device_unregister(&sdev->sdev_classdev);
 783         transport_remove_device(dev);
 784         device_del(dev);
 785         scsi_device_set_state(sdev, SDEV_DEL);
 786         if (sdev->host->hostt->slave_destroy)
 787                 sdev->host->hostt->slave_destroy(sdev);
 788         transport_destroy_device(dev);
 789         put_device(dev);
 790 }
 791
 792 /**
 793  * scsi_remove_device - unregister a device from the scsi bus
 794  * @sdev:       scsi_device to unregister
 795  **/
 796 void scsi_remove_device(struct scsi_device *sdev)
 797 {
 798         struct Scsi_Host *shost = sdev->host;
 799
 800         mutex_lock(&shost->scan_mutex);
 801         __scsi_remove_device(sdev);
 802         mutex_unlock(&shost->scan_mutex);
 803 }
 804 EXPORT_SYMBOL(scsi_remove_device);
 805
 806 void __scsi_remove_target(struct scsi_target *starget)
 807 {
 808         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 809         unsigned long flags;
 810         struct scsi_device *sdev;
 811
 812         spin_lock_irqsave(shost->host_lock, flags);
 813         starget->reap_ref++;
 814  restart:
 815         list_for_each_entry(sdev, &shost->__devices, siblings) {
 816                 if (sdev->channel != starget->channel ||
 817                     sdev->id != starget->id ||
 818                     sdev->sdev_state == SDEV_DEL)
 819                         continue;
 820                 spin_unlock_irqrestore(shost->host_lock, flags);
 821                 scsi_remove_device(sdev);
 822                 spin_lock_irqsave(shost->host_lock, flags);
 823                 goto restart;
 824         }
 825         spin_unlock_irqrestore(shost->host_lock, flags);
 826         scsi_target_reap(starget);
 827 }
 828
 829 static int __remove_child (struct device * dev, void * data)
 830 {
 831         if (scsi_is_target_device(dev))
 832                 __scsi_remove_target(to_scsi_target(dev));
 833         return 0;
 834 }
 835
 836 /**
 837  * scsi_remove_target - try to remove a target and all its devices
 838  * @dev: generic starget or parent of generic stargets to be removed
 839  *
 840  * Note: This is slightly racy.  It is possible that if the user
 841  * requests the addition of another device then the target won't be
 842  * removed.
 843  */
 844 void scsi_remove_target(struct device *dev)
 845 {
 846         struct device *rdev;
 847
 848         if (scsi_is_target_device(dev)) {
 849                 __scsi_remove_target(to_scsi_target(dev));
 850                 return;
 851         }
 852
 853         rdev = get_device(dev);
 854         device_for_each_child(dev, NULL, __remove_child);
 855         put_device(rdev);
 856 }
 857 EXPORT_SYMBOL(scsi_remove_target);
 858
 859 int scsi_register_driver(struct device_driver *drv)
 860 {
 861         drv->bus = &scsi_bus_type;
 862
 863         return driver_register(drv);
 864 }
 865 EXPORT_SYMBOL(scsi_register_driver);
 866
 867 int scsi_register_interface(struct class_interface *intf)
 868 {
 869         intf->class = &sdev_class;
 870
 871         return class_interface_register(intf);
 872 }
 873 EXPORT_SYMBOL(scsi_register_interface);
 874
 875
 876 static struct class_device_attribute *class_attr_overridden(
 877                 struct class_device_attribute **attrs,
 878                 struct class_device_attribute *attr)
 879 {
 880         int i;
 881
 882         if (!attrs)
 883                 return NULL;
 884         for (i = 0; attrs[i]; i++)
 885                 if (!strcmp(attrs[i]->attr.name, attr->attr.name))
 886                         return attrs[i];
 887         return NULL;
 888 }
 889
 890 static int class_attr_add(struct class_device *classdev,
 891                 struct class_device_attribute *attr)
 892 {
 893         struct class_device_attribute *base_attr;
 894
 895         /*
 896          * Spare the caller from having to copy things it's not interested in.
 897          */
 898         base_attr = class_attr_overridden(scsi_sysfs_shost_attrs, attr);
 899         if (base_attr) {
 900                 /* extend permissions */
 901                 attr->attr.mode |= base_attr->attr.mode;
 902
 903                 /* override null show/store with default */
 904                 if (!attr->show)
 905                         attr->show = base_attr->show;
 906                 if (!attr->store)
 907                         attr->store = base_attr->store;
 908         }
 909
 910         return class_device_create_file(classdev, attr);
 911 }
 912
 913 /**
 914  * scsi_sysfs_add_host - add scsi host to subsystem
 915  * @shost:     scsi host struct to add to subsystem
 916  * @dev:       parent struct device pointer
 917  **/
 918 int scsi_sysfs_add_host(struct Scsi_Host *shost)
 919 {
 920         int error, i;
 921
 922         if (shost->hostt->shost_attrs) {
 923                 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
 924                         error = class_attr_add(&shost->shost_classdev,
 925                                         shost->hostt->shost_attrs[i]);
 926                         if (error)
 927                                 return error;
 928                 }
 929         }
 930
 931         for (i = 0; scsi_sysfs_shost_attrs[i]; i++) {
 932                 if (!class_attr_overridden(shost->hostt->shost_attrs,
 933                                         scsi_sysfs_shost_attrs[i])) {
 934                         error = class_device_create_file(&shost->shost_classdev,
 935                                         scsi_sysfs_shost_attrs[i]);
 936                         if (error)
 937                                 return error;
 938                 }
 939         }
 940
 941         transport_register_device(&shost->shost_gendev);
 942         return 0;
 943 }
 944
 945 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
 946 {
 947         unsigned long flags;
 948         struct Scsi_Host *shost = sdev->host;
 949         struct scsi_target  *starget = sdev->sdev_target;
 950
 951         device_initialize(&sdev->sdev_gendev);
 952         sdev->sdev_gendev.bus = &scsi_bus_type;
 953         sdev->sdev_gendev.release = scsi_device_dev_release;
 954         sprintf(sdev->sdev_gendev.bus_id,"%d:%d:%d:%d",
 955                 sdev->host->host_no, sdev->channel, sdev->id,
 956                 sdev->lun);
 957
 958         class_device_initialize(&sdev->sdev_classdev);
 959         sdev->sdev_classdev.dev = &sdev->sdev_gendev;
 960         sdev->sdev_classdev.class = &sdev_class;
 961         snprintf(sdev->sdev_classdev.class_id, BUS_ID_SIZE,
 962                  "%d:%d:%d:%d", sdev->host->host_no,
 963                  sdev->channel, sdev->id, sdev->lun);
 964         sdev->scsi_level = starget->scsi_level;
 965         transport_setup_device(&sdev->sdev_gendev);
 966         spin_lock_irqsave(shost->host_lock, flags);
 967         list_add_tail(&sdev->same_target_siblings, &starget->devices);
 968         list_add_tail(&sdev->siblings, &shost->__devices);
 969         spin_unlock_irqrestore(shost->host_lock, flags);
 970 }
 971
 972 int scsi_is_sdev_device(const struct device *dev)
 973 {
 974         return dev->release == scsi_device_dev_release;
 975 }
 976 EXPORT_SYMBOL(scsi_is_sdev_device);
 977
 978 /* A blank transport template that is used in drivers that don't
 979  * yet implement Transport Attributes */
 980 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };