drivers/scsi/scsi_sysfs.c

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