scsi_sysfs.c revision d3301874083874f8a0ac88aa1bb7da6b62df34d2
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 24static 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 37const 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 51static struct { 52 enum scsi_host_state value; 53 char *name; 54} shost_states[] = { 55 { SHOST_CREATED, "created" }, 56 { SHOST_RUNNING, "running" }, 57 { SHOST_CANCEL, "cancel" }, 58 { SHOST_DEL, "deleted" }, 59 { SHOST_RECOVERY, "recovery" }, 60}; 61const char *scsi_host_state_name(enum scsi_host_state state) 62{ 63 int i; 64 char *name = NULL; 65 66 for (i = 0; i < sizeof(shost_states)/sizeof(shost_states[0]); i++) { 67 if (shost_states[i].value == state) { 68 name = shost_states[i].name; 69 break; 70 } 71 } 72 return name; 73} 74 75static int check_set(unsigned int *val, char *src) 76{ 77 char *last; 78 79 if (strncmp(src, "-", 20) == 0) { 80 *val = SCAN_WILD_CARD; 81 } else { 82 /* 83 * Doesn't check for int overflow 84 */ 85 *val = simple_strtoul(src, &last, 0); 86 if (*last != '\0') 87 return 1; 88 } 89 return 0; 90} 91 92static int scsi_scan(struct Scsi_Host *shost, const char *str) 93{ 94 char s1[15], s2[15], s3[15], junk; 95 unsigned int channel, id, lun; 96 int res; 97 98 res = sscanf(str, "%10s %10s %10s %c", s1, s2, s3, &junk); 99 if (res != 3) 100 return -EINVAL; 101 if (check_set(&channel, s1)) 102 return -EINVAL; 103 if (check_set(&id, s2)) 104 return -EINVAL; 105 if (check_set(&lun, s3)) 106 return -EINVAL; 107 res = scsi_scan_host_selected(shost, channel, id, lun, 1); 108 return res; 109} 110 111/* 112 * shost_show_function: macro to create an attr function that can be used to 113 * show a non-bit field. 114 */ 115#define shost_show_function(name, field, format_string) \ 116static ssize_t \ 117show_##name (struct class_device *class_dev, char *buf) \ 118{ \ 119 struct Scsi_Host *shost = class_to_shost(class_dev); \ 120 return snprintf (buf, 20, format_string, shost->field); \ 121} 122 123/* 124 * shost_rd_attr: macro to create a function and attribute variable for a 125 * read only field. 126 */ 127#define shost_rd_attr2(name, field, format_string) \ 128 shost_show_function(name, field, format_string) \ 129static CLASS_DEVICE_ATTR(name, S_IRUGO, show_##name, NULL); 130 131#define shost_rd_attr(field, format_string) \ 132shost_rd_attr2(field, field, format_string) 133 134/* 135 * Create the actual show/store functions and data structures. 136 */ 137 138static ssize_t store_scan(struct class_device *class_dev, const char *buf, 139 size_t count) 140{ 141 struct Scsi_Host *shost = class_to_shost(class_dev); 142 int res; 143 144 res = scsi_scan(shost, buf); 145 if (res == 0) 146 res = count; 147 return res; 148}; 149static CLASS_DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan); 150 151static ssize_t 152store_shost_state(struct class_device *class_dev, const char *buf, size_t count) 153{ 154 int i; 155 struct Scsi_Host *shost = class_to_shost(class_dev); 156 enum scsi_host_state state = 0; 157 158 for (i = 0; i < sizeof(shost_states)/sizeof(shost_states[0]); i++) { 159 const int len = strlen(shost_states[i].name); 160 if (strncmp(shost_states[i].name, buf, len) == 0 && 161 buf[len] == '\n') { 162 state = shost_states[i].value; 163 break; 164 } 165 } 166 if (!state) 167 return -EINVAL; 168 169 if (scsi_host_set_state(shost, state)) 170 return -EINVAL; 171 return count; 172} 173 174static ssize_t 175show_shost_state(struct class_device *class_dev, char *buf) 176{ 177 struct Scsi_Host *shost = class_to_shost(class_dev); 178 const char *name = scsi_host_state_name(shost->shost_state); 179 180 if (!name) 181 return -EINVAL; 182 183 return snprintf(buf, 20, "%s\n", name); 184} 185 186static CLASS_DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state); 187 188shost_rd_attr(unique_id, "%u\n"); 189shost_rd_attr(host_busy, "%hu\n"); 190shost_rd_attr(cmd_per_lun, "%hd\n"); 191shost_rd_attr(sg_tablesize, "%hu\n"); 192shost_rd_attr(unchecked_isa_dma, "%d\n"); 193shost_rd_attr2(proc_name, hostt->proc_name, "%s\n"); 194 195static struct class_device_attribute *scsi_sysfs_shost_attrs[] = { 196 &class_device_attr_unique_id, 197 &class_device_attr_host_busy, 198 &class_device_attr_cmd_per_lun, 199 &class_device_attr_sg_tablesize, 200 &class_device_attr_unchecked_isa_dma, 201 &class_device_attr_proc_name, 202 &class_device_attr_scan, 203 &class_device_attr_state, 204 NULL 205}; 206 207static void scsi_device_cls_release(struct class_device *class_dev) 208{ 209 struct scsi_device *sdev; 210 211 sdev = class_to_sdev(class_dev); 212 put_device(&sdev->sdev_gendev); 213} 214 215static void scsi_device_dev_release(struct device *dev) 216{ 217 struct scsi_device *sdev; 218 struct device *parent; 219 struct scsi_target *starget; 220 unsigned long flags; 221 222 parent = dev->parent; 223 sdev = to_scsi_device(dev); 224 starget = to_scsi_target(parent); 225 226 spin_lock_irqsave(sdev->host->host_lock, flags); 227 starget->reap_ref++; 228 list_del(&sdev->siblings); 229 list_del(&sdev->same_target_siblings); 230 list_del(&sdev->starved_entry); 231 spin_unlock_irqrestore(sdev->host->host_lock, flags); 232 233 if (sdev->request_queue) { 234 sdev->request_queue->queuedata = NULL; 235 scsi_free_queue(sdev->request_queue); 236 /* temporary expedient, try to catch use of queue lock 237 * after free of sdev */ 238 sdev->request_queue = NULL; 239 } 240 241 scsi_target_reap(scsi_target(sdev)); 242 243 kfree(sdev->inquiry); 244 kfree(sdev); 245 246 if (parent) 247 put_device(parent); 248} 249 250static struct class sdev_class = { 251 .name = "scsi_device", 252 .release = scsi_device_cls_release, 253}; 254 255/* all probing is done in the individual ->probe routines */ 256static int scsi_bus_match(struct device *dev, struct device_driver *gendrv) 257{ 258 struct scsi_device *sdp = to_scsi_device(dev); 259 if (sdp->no_uld_attach) 260 return 0; 261 return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0; 262} 263 264struct bus_type scsi_bus_type = { 265 .name = "scsi", 266 .match = scsi_bus_match, 267}; 268 269int scsi_sysfs_register(void) 270{ 271 int error; 272 273 error = bus_register(&scsi_bus_type); 274 if (!error) { 275 error = class_register(&sdev_class); 276 if (error) 277 bus_unregister(&scsi_bus_type); 278 } 279 280 return error; 281} 282 283void scsi_sysfs_unregister(void) 284{ 285 class_unregister(&sdev_class); 286 bus_unregister(&scsi_bus_type); 287} 288 289/* 290 * sdev_show_function: macro to create an attr function that can be used to 291 * show a non-bit field. 292 */ 293#define sdev_show_function(field, format_string) \ 294static ssize_t \ 295sdev_show_##field (struct device *dev, struct device_attribute *attr, char *buf) \ 296{ \ 297 struct scsi_device *sdev; \ 298 sdev = to_scsi_device(dev); \ 299 return snprintf (buf, 20, format_string, sdev->field); \ 300} \ 301 302/* 303 * sdev_rd_attr: macro to create a function and attribute variable for a 304 * read only field. 305 */ 306#define sdev_rd_attr(field, format_string) \ 307 sdev_show_function(field, format_string) \ 308static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL); 309 310 311/* 312 * sdev_rd_attr: create a function and attribute variable for a 313 * read/write field. 314 */ 315#define sdev_rw_attr(field, format_string) \ 316 sdev_show_function(field, format_string) \ 317 \ 318static ssize_t \ 319sdev_store_##field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) \ 320{ \ 321 struct scsi_device *sdev; \ 322 sdev = to_scsi_device(dev); \ 323 snscanf (buf, 20, format_string, &sdev->field); \ 324 return count; \ 325} \ 326static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field); 327 328/* Currently we don't export bit fields, but we might in future, 329 * so leave this code in */ 330#if 0 331/* 332 * sdev_rd_attr: create a function and attribute variable for a 333 * read/write bit field. 334 */ 335#define sdev_rw_attr_bit(field) \ 336 sdev_show_function(field, "%d\n") \ 337 \ 338static ssize_t \ 339sdev_store_##field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) \ 340{ \ 341 int ret; \ 342 struct scsi_device *sdev; \ 343 ret = scsi_sdev_check_buf_bit(buf); \ 344 if (ret >= 0) { \ 345 sdev = to_scsi_device(dev); \ 346 sdev->field = ret; \ 347 ret = count; \ 348 } \ 349 return ret; \ 350} \ 351static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field); 352 353/* 354 * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1", 355 * else return -EINVAL. 356 */ 357static int scsi_sdev_check_buf_bit(const char *buf) 358{ 359 if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) { 360 if (buf[0] == '1') 361 return 1; 362 else if (buf[0] == '0') 363 return 0; 364 else 365 return -EINVAL; 366 } else 367 return -EINVAL; 368} 369#endif 370/* 371 * Create the actual show/store functions and data structures. 372 */ 373sdev_rd_attr (device_blocked, "%d\n"); 374sdev_rd_attr (queue_depth, "%d\n"); 375sdev_rd_attr (type, "%d\n"); 376sdev_rd_attr (scsi_level, "%d\n"); 377sdev_rd_attr (vendor, "%.8s\n"); 378sdev_rd_attr (model, "%.16s\n"); 379sdev_rd_attr (rev, "%.4s\n"); 380 381static ssize_t 382sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf) 383{ 384 struct scsi_device *sdev; 385 sdev = to_scsi_device(dev); 386 return snprintf (buf, 20, "%d\n", sdev->timeout / HZ); 387} 388 389static ssize_t 390sdev_store_timeout (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) 391{ 392 struct scsi_device *sdev; 393 int timeout; 394 sdev = to_scsi_device(dev); 395 sscanf (buf, "%d\n", &timeout); 396 sdev->timeout = timeout * HZ; 397 return count; 398} 399static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout); 400 401static ssize_t 402store_rescan_field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) 403{ 404 scsi_rescan_device(dev); 405 return count; 406} 407static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field); 408 409static ssize_t sdev_store_delete(struct device *dev, struct device_attribute *attr, const char *buf, 410 size_t count) 411{ 412 scsi_remove_device(to_scsi_device(dev)); 413 return count; 414}; 415static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete); 416 417static ssize_t 418store_state_field(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) 419{ 420 int i; 421 struct scsi_device *sdev = to_scsi_device(dev); 422 enum scsi_device_state state = 0; 423 424 for (i = 0; i < sizeof(sdev_states)/sizeof(sdev_states[0]); i++) { 425 const int len = strlen(sdev_states[i].name); 426 if (strncmp(sdev_states[i].name, buf, len) == 0 && 427 buf[len] == '\n') { 428 state = sdev_states[i].value; 429 break; 430 } 431 } 432 if (!state) 433 return -EINVAL; 434 435 if (scsi_device_set_state(sdev, state)) 436 return -EINVAL; 437 return count; 438} 439 440static ssize_t 441show_state_field(struct device *dev, struct device_attribute *attr, char *buf) 442{ 443 struct scsi_device *sdev = to_scsi_device(dev); 444 const char *name = scsi_device_state_name(sdev->sdev_state); 445 446 if (!name) 447 return -EINVAL; 448 449 return snprintf(buf, 20, "%s\n", name); 450} 451 452static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field); 453 454static ssize_t 455show_queue_type_field(struct device *dev, struct device_attribute *attr, char *buf) 456{ 457 struct scsi_device *sdev = to_scsi_device(dev); 458 const char *name = "none"; 459 460 if (sdev->ordered_tags) 461 name = "ordered"; 462 else if (sdev->simple_tags) 463 name = "simple"; 464 465 return snprintf(buf, 20, "%s\n", name); 466} 467 468static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL); 469 470static ssize_t 471show_iostat_counterbits(struct device *dev, struct device_attribute *attr, char *buf) 472{ 473 return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8); 474} 475 476static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL); 477 478#define show_sdev_iostat(field) \ 479static ssize_t \ 480show_iostat_##field(struct device *dev, struct device_attribute *attr, char *buf) \ 481{ \ 482 struct scsi_device *sdev = to_scsi_device(dev); \ 483 unsigned long long count = atomic_read(&sdev->field); \ 484 return snprintf(buf, 20, "0x%llx\n", count); \ 485} \ 486static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL) 487 488show_sdev_iostat(iorequest_cnt); 489show_sdev_iostat(iodone_cnt); 490show_sdev_iostat(ioerr_cnt); 491 492 493/* Default template for device attributes. May NOT be modified */ 494static struct device_attribute *scsi_sysfs_sdev_attrs[] = { 495 &dev_attr_device_blocked, 496 &dev_attr_queue_depth, 497 &dev_attr_queue_type, 498 &dev_attr_type, 499 &dev_attr_scsi_level, 500 &dev_attr_vendor, 501 &dev_attr_model, 502 &dev_attr_rev, 503 &dev_attr_rescan, 504 &dev_attr_delete, 505 &dev_attr_state, 506 &dev_attr_timeout, 507 &dev_attr_iocounterbits, 508 &dev_attr_iorequest_cnt, 509 &dev_attr_iodone_cnt, 510 &dev_attr_ioerr_cnt, 511 NULL 512}; 513 514static ssize_t sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr, const char *buf, 515 size_t count) 516{ 517 int depth, retval; 518 struct scsi_device *sdev = to_scsi_device(dev); 519 struct scsi_host_template *sht = sdev->host->hostt; 520 521 if (!sht->change_queue_depth) 522 return -EINVAL; 523 524 depth = simple_strtoul(buf, NULL, 0); 525 526 if (depth < 1) 527 return -EINVAL; 528 529 retval = sht->change_queue_depth(sdev, depth); 530 if (retval < 0) 531 return retval; 532 533 return count; 534} 535 536static struct device_attribute sdev_attr_queue_depth_rw = 537 __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth, 538 sdev_store_queue_depth_rw); 539 540static ssize_t sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr, const char *buf, 541 size_t count) 542{ 543 struct scsi_device *sdev = to_scsi_device(dev); 544 struct scsi_host_template *sht = sdev->host->hostt; 545 int tag_type = 0, retval; 546 int prev_tag_type = scsi_get_tag_type(sdev); 547 548 if (!sdev->tagged_supported || !sht->change_queue_type) 549 return -EINVAL; 550 551 if (strncmp(buf, "ordered", 7) == 0) 552 tag_type = MSG_ORDERED_TAG; 553 else if (strncmp(buf, "simple", 6) == 0) 554 tag_type = MSG_SIMPLE_TAG; 555 else if (strncmp(buf, "none", 4) != 0) 556 return -EINVAL; 557 558 if (tag_type == prev_tag_type) 559 return count; 560 561 retval = sht->change_queue_type(sdev, tag_type); 562 if (retval < 0) 563 return retval; 564 565 return count; 566} 567 568static struct device_attribute sdev_attr_queue_type_rw = 569 __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field, 570 sdev_store_queue_type_rw); 571 572static struct device_attribute *attr_changed_internally( 573 struct Scsi_Host *shost, 574 struct device_attribute * attr) 575{ 576 if (!strcmp("queue_depth", attr->attr.name) 577 && shost->hostt->change_queue_depth) 578 return &sdev_attr_queue_depth_rw; 579 else if (!strcmp("queue_type", attr->attr.name) 580 && shost->hostt->change_queue_type) 581 return &sdev_attr_queue_type_rw; 582 return attr; 583} 584 585 586static struct device_attribute *attr_overridden( 587 struct device_attribute **attrs, 588 struct device_attribute *attr) 589{ 590 int i; 591 592 if (!attrs) 593 return NULL; 594 for (i = 0; attrs[i]; i++) 595 if (!strcmp(attrs[i]->attr.name, attr->attr.name)) 596 return attrs[i]; 597 return NULL; 598} 599 600static int attr_add(struct device *dev, struct device_attribute *attr) 601{ 602 struct device_attribute *base_attr; 603 604 /* 605 * Spare the caller from having to copy things it's not interested in. 606 */ 607 base_attr = attr_overridden(scsi_sysfs_sdev_attrs, attr); 608 if (base_attr) { 609 /* extend permissions */ 610 attr->attr.mode |= base_attr->attr.mode; 611 612 /* override null show/store with default */ 613 if (!attr->show) 614 attr->show = base_attr->show; 615 if (!attr->store) 616 attr->store = base_attr->store; 617 } 618 619 return device_create_file(dev, attr); 620} 621 622/** 623 * scsi_sysfs_add_sdev - add scsi device to sysfs 624 * @sdev: scsi_device to add 625 * 626 * Return value: 627 * 0 on Success / non-zero on Failure 628 **/ 629int scsi_sysfs_add_sdev(struct scsi_device *sdev) 630{ 631 int error, i; 632 633 if ((error = scsi_device_set_state(sdev, SDEV_RUNNING)) != 0) 634 return error; 635 636 error = device_add(&sdev->sdev_gendev); 637 if (error) { 638 put_device(sdev->sdev_gendev.parent); 639 printk(KERN_INFO "error 1\n"); 640 return error; 641 } 642 error = class_device_add(&sdev->sdev_classdev); 643 if (error) { 644 printk(KERN_INFO "error 2\n"); 645 goto clean_device; 646 } 647 648 /* take a reference for the sdev_classdev; this is 649 * released by the sdev_class .release */ 650 get_device(&sdev->sdev_gendev); 651 if (sdev->host->hostt->sdev_attrs) { 652 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) { 653 error = attr_add(&sdev->sdev_gendev, 654 sdev->host->hostt->sdev_attrs[i]); 655 if (error) { 656 scsi_remove_device(sdev); 657 goto out; 658 } 659 } 660 } 661 662 for (i = 0; scsi_sysfs_sdev_attrs[i]; i++) { 663 if (!attr_overridden(sdev->host->hostt->sdev_attrs, 664 scsi_sysfs_sdev_attrs[i])) { 665 struct device_attribute * attr = 666 attr_changed_internally(sdev->host, 667 scsi_sysfs_sdev_attrs[i]); 668 error = device_create_file(&sdev->sdev_gendev, attr); 669 if (error) { 670 scsi_remove_device(sdev); 671 goto out; 672 } 673 } 674 } 675 676 transport_add_device(&sdev->sdev_gendev); 677 out: 678 return error; 679 680 clean_device: 681 scsi_device_set_state(sdev, SDEV_CANCEL); 682 683 device_del(&sdev->sdev_gendev); 684 transport_destroy_device(&sdev->sdev_gendev); 685 put_device(&sdev->sdev_gendev); 686 687 return error; 688} 689 690/** 691 * scsi_remove_device - unregister a device from the scsi bus 692 * @sdev: scsi_device to unregister 693 **/ 694void scsi_remove_device(struct scsi_device *sdev) 695{ 696 struct Scsi_Host *shost = sdev->host; 697 698 down(&shost->scan_mutex); 699 if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0) 700 goto out; 701 702 class_device_unregister(&sdev->sdev_classdev); 703 device_del(&sdev->sdev_gendev); 704 scsi_device_set_state(sdev, SDEV_DEL); 705 if (sdev->host->hostt->slave_destroy) 706 sdev->host->hostt->slave_destroy(sdev); 707 transport_unregister_device(&sdev->sdev_gendev); 708 put_device(&sdev->sdev_gendev); 709out: 710 up(&shost->scan_mutex); 711} 712EXPORT_SYMBOL(scsi_remove_device); 713 714void __scsi_remove_target(struct scsi_target *starget) 715{ 716 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); 717 unsigned long flags; 718 struct scsi_device *sdev, *tmp; 719 720 spin_lock_irqsave(shost->host_lock, flags); 721 starget->reap_ref++; 722 list_for_each_entry_safe(sdev, tmp, &shost->__devices, siblings) { 723 if (sdev->channel != starget->channel || 724 sdev->id != starget->id) 725 continue; 726 spin_unlock_irqrestore(shost->host_lock, flags); 727 scsi_remove_device(sdev); 728 spin_lock_irqsave(shost->host_lock, flags); 729 } 730 spin_unlock_irqrestore(shost->host_lock, flags); 731 scsi_target_reap(starget); 732} 733 734static int __remove_child (struct device * dev, void * data) 735{ 736 if (scsi_is_target_device(dev)) 737 __scsi_remove_target(to_scsi_target(dev)); 738 return 0; 739} 740 741/** 742 * scsi_remove_target - try to remove a target and all its devices 743 * @dev: generic starget or parent of generic stargets to be removed 744 * 745 * Note: This is slightly racy. It is possible that if the user 746 * requests the addition of another device then the target won't be 747 * removed. 748 */ 749void scsi_remove_target(struct device *dev) 750{ 751 struct device *rdev; 752 753 if (scsi_is_target_device(dev)) { 754 __scsi_remove_target(to_scsi_target(dev)); 755 return; 756 } 757 758 rdev = get_device(dev); 759 device_for_each_child(dev, NULL, __remove_child); 760 put_device(rdev); 761} 762EXPORT_SYMBOL(scsi_remove_target); 763 764int scsi_register_driver(struct device_driver *drv) 765{ 766 drv->bus = &scsi_bus_type; 767 768 return driver_register(drv); 769} 770EXPORT_SYMBOL(scsi_register_driver); 771 772int scsi_register_interface(struct class_interface *intf) 773{ 774 intf->class = &sdev_class; 775 776 return class_interface_register(intf); 777} 778EXPORT_SYMBOL(scsi_register_interface); 779 780 781static struct class_device_attribute *class_attr_overridden( 782 struct class_device_attribute **attrs, 783 struct class_device_attribute *attr) 784{ 785 int i; 786 787 if (!attrs) 788 return NULL; 789 for (i = 0; attrs[i]; i++) 790 if (!strcmp(attrs[i]->attr.name, attr->attr.name)) 791 return attrs[i]; 792 return NULL; 793} 794 795static int class_attr_add(struct class_device *classdev, 796 struct class_device_attribute *attr) 797{ 798 struct class_device_attribute *base_attr; 799 800 /* 801 * Spare the caller from having to copy things it's not interested in. 802 */ 803 base_attr = class_attr_overridden(scsi_sysfs_shost_attrs, attr); 804 if (base_attr) { 805 /* extend permissions */ 806 attr->attr.mode |= base_attr->attr.mode; 807 808 /* override null show/store with default */ 809 if (!attr->show) 810 attr->show = base_attr->show; 811 if (!attr->store) 812 attr->store = base_attr->store; 813 } 814 815 return class_device_create_file(classdev, attr); 816} 817 818/** 819 * scsi_sysfs_add_host - add scsi host to subsystem 820 * @shost: scsi host struct to add to subsystem 821 * @dev: parent struct device pointer 822 **/ 823int scsi_sysfs_add_host(struct Scsi_Host *shost) 824{ 825 int error, i; 826 827 if (shost->hostt->shost_attrs) { 828 for (i = 0; shost->hostt->shost_attrs[i]; i++) { 829 error = class_attr_add(&shost->shost_classdev, 830 shost->hostt->shost_attrs[i]); 831 if (error) 832 return error; 833 } 834 } 835 836 for (i = 0; scsi_sysfs_shost_attrs[i]; i++) { 837 if (!class_attr_overridden(shost->hostt->shost_attrs, 838 scsi_sysfs_shost_attrs[i])) { 839 error = class_device_create_file(&shost->shost_classdev, 840 scsi_sysfs_shost_attrs[i]); 841 if (error) 842 return error; 843 } 844 } 845 846 transport_register_device(&shost->shost_gendev); 847 return 0; 848} 849 850void scsi_sysfs_device_initialize(struct scsi_device *sdev) 851{ 852 unsigned long flags; 853 struct Scsi_Host *shost = sdev->host; 854 struct scsi_target *starget = sdev->sdev_target; 855 856 device_initialize(&sdev->sdev_gendev); 857 sdev->sdev_gendev.bus = &scsi_bus_type; 858 sdev->sdev_gendev.release = scsi_device_dev_release; 859 sprintf(sdev->sdev_gendev.bus_id,"%d:%d:%d:%d", 860 sdev->host->host_no, sdev->channel, sdev->id, 861 sdev->lun); 862 863 class_device_initialize(&sdev->sdev_classdev); 864 sdev->sdev_classdev.dev = &sdev->sdev_gendev; 865 sdev->sdev_classdev.class = &sdev_class; 866 snprintf(sdev->sdev_classdev.class_id, BUS_ID_SIZE, 867 "%d:%d:%d:%d", sdev->host->host_no, 868 sdev->channel, sdev->id, sdev->lun); 869 sdev->scsi_level = SCSI_2; 870 transport_setup_device(&sdev->sdev_gendev); 871 spin_lock_irqsave(shost->host_lock, flags); 872 list_add_tail(&sdev->same_target_siblings, &starget->devices); 873 list_add_tail(&sdev->siblings, &shost->__devices); 874 spin_unlock_irqrestore(shost->host_lock, flags); 875} 876 877int scsi_is_sdev_device(const struct device *dev) 878{ 879 return dev->release == scsi_device_dev_release; 880} 881EXPORT_SYMBOL(scsi_is_sdev_device); 882 883/* A blank transport template that is used in drivers that don't 884 * yet implement Transport Attributes */ 885struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, }; 886