1 /* 2 * Copyright (C) 2007 Oracle. All rights reserved. 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public 6 * License v2 as published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope that it will be useful, 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 11 * General Public License for more details. 12 * 13 * You should have received a copy of the GNU General Public 14 * License along with this program; if not, write to the 15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 16 * Boston, MA 021110-1307, USA. 17 */ 18 19 #include <linux/sched.h> 20 #include <linux/slab.h> 21 #include <linux/spinlock.h> 22 #include <linux/completion.h> 23 #include <linux/buffer_head.h> 24 #include <linux/kobject.h> 25 #include <linux/bug.h> 26 #include <linux/genhd.h> 27 #include <linux/debugfs.h> 28 29 #include "ctree.h" 30 #include "disk-io.h" 31 #include "transaction.h" 32 #include "sysfs.h" 33 #include "volumes.h" 34 35 static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj); 36 37 static u64 get_features(struct btrfs_fs_info *fs_info, 38 enum btrfs_feature_set set) 39 { 40 struct btrfs_super_block *disk_super = fs_info->super_copy; 41 if (set == FEAT_COMPAT) 42 return btrfs_super_compat_flags(disk_super); 43 else if (set == FEAT_COMPAT_RO) 44 return btrfs_super_compat_ro_flags(disk_super); 45 else 46 return btrfs_super_incompat_flags(disk_super); 47 } 48 49 static void set_features(struct btrfs_fs_info *fs_info, 50 enum btrfs_feature_set set, u64 features) 51 { 52 struct btrfs_super_block *disk_super = fs_info->super_copy; 53 if (set == FEAT_COMPAT) 54 btrfs_set_super_compat_flags(disk_super, features); 55 else if (set == FEAT_COMPAT_RO) 56 btrfs_set_super_compat_ro_flags(disk_super, features); 57 else 58 btrfs_set_super_incompat_flags(disk_super, features); 59 } 60 61 static int can_modify_feature(struct btrfs_feature_attr *fa) 62 { 63 int val = 0; 64 u64 set, clear; 65 switch (fa->feature_set) { 66 case FEAT_COMPAT: 67 set = BTRFS_FEATURE_COMPAT_SAFE_SET; 68 clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR; 69 break; 70 case FEAT_COMPAT_RO: 71 set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET; 72 clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR; 73 break; 74 case FEAT_INCOMPAT: 75 set = BTRFS_FEATURE_INCOMPAT_SAFE_SET; 76 clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR; 77 break; 78 default: 79 printk(KERN_WARNING "btrfs: sysfs: unknown feature set %d\n", 80 fa->feature_set); 81 return 0; 82 } 83 84 if (set & fa->feature_bit) 85 val |= 1; 86 if (clear & fa->feature_bit) 87 val |= 2; 88 89 return val; 90 } 91 92 static ssize_t btrfs_feature_attr_show(struct kobject *kobj, 93 struct kobj_attribute *a, char *buf) 94 { 95 int val = 0; 96 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 97 struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a); 98 if (fs_info) { 99 u64 features = get_features(fs_info, fa->feature_set); 100 if (features & fa->feature_bit) 101 val = 1; 102 } else 103 val = can_modify_feature(fa); 104 105 return snprintf(buf, PAGE_SIZE, "%d\n", val); 106 } 107 108 static ssize_t btrfs_feature_attr_store(struct kobject *kobj, 109 struct kobj_attribute *a, 110 const char *buf, size_t count) 111 { 112 struct btrfs_fs_info *fs_info; 113 struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a); 114 u64 features, set, clear; 115 unsigned long val; 116 int ret; 117 118 fs_info = to_fs_info(kobj); 119 if (!fs_info) 120 return -EPERM; 121 122 ret = kstrtoul(skip_spaces(buf), 0, &val); 123 if (ret) 124 return ret; 125 126 if (fa->feature_set == FEAT_COMPAT) { 127 set = BTRFS_FEATURE_COMPAT_SAFE_SET; 128 clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR; 129 } else if (fa->feature_set == FEAT_COMPAT_RO) { 130 set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET; 131 clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR; 132 } else { 133 set = BTRFS_FEATURE_INCOMPAT_SAFE_SET; 134 clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR; 135 } 136 137 features = get_features(fs_info, fa->feature_set); 138 139 /* Nothing to do */ 140 if ((val && (features & fa->feature_bit)) || 141 (!val && !(features & fa->feature_bit))) 142 return count; 143 144 if ((val && !(set & fa->feature_bit)) || 145 (!val && !(clear & fa->feature_bit))) { 146 btrfs_info(fs_info, 147 "%sabling feature %s on mounted fs is not supported.", 148 val ? "En" : "Dis", fa->kobj_attr.attr.name); 149 return -EPERM; 150 } 151 152 btrfs_info(fs_info, "%s %s feature flag", 153 val ? "Setting" : "Clearing", fa->kobj_attr.attr.name); 154 155 spin_lock(&fs_info->super_lock); 156 features = get_features(fs_info, fa->feature_set); 157 if (val) 158 features |= fa->feature_bit; 159 else 160 features &= ~fa->feature_bit; 161 set_features(fs_info, fa->feature_set, features); 162 spin_unlock(&fs_info->super_lock); 163 164 /* 165 * We don't want to do full transaction commit from inside sysfs 166 */ 167 btrfs_set_pending(fs_info, COMMIT); 168 wake_up_process(fs_info->transaction_kthread); 169 170 return count; 171 } 172 173 static umode_t btrfs_feature_visible(struct kobject *kobj, 174 struct attribute *attr, int unused) 175 { 176 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 177 umode_t mode = attr->mode; 178 179 if (fs_info) { 180 struct btrfs_feature_attr *fa; 181 u64 features; 182 183 fa = attr_to_btrfs_feature_attr(attr); 184 features = get_features(fs_info, fa->feature_set); 185 186 if (can_modify_feature(fa)) 187 mode |= S_IWUSR; 188 else if (!(features & fa->feature_bit)) 189 mode = 0; 190 } 191 192 return mode; 193 } 194 195 BTRFS_FEAT_ATTR_INCOMPAT(mixed_backref, MIXED_BACKREF); 196 BTRFS_FEAT_ATTR_INCOMPAT(default_subvol, DEFAULT_SUBVOL); 197 BTRFS_FEAT_ATTR_INCOMPAT(mixed_groups, MIXED_GROUPS); 198 BTRFS_FEAT_ATTR_INCOMPAT(compress_lzo, COMPRESS_LZO); 199 BTRFS_FEAT_ATTR_INCOMPAT(big_metadata, BIG_METADATA); 200 BTRFS_FEAT_ATTR_INCOMPAT(extended_iref, EXTENDED_IREF); 201 BTRFS_FEAT_ATTR_INCOMPAT(raid56, RAID56); 202 BTRFS_FEAT_ATTR_INCOMPAT(skinny_metadata, SKINNY_METADATA); 203 BTRFS_FEAT_ATTR_INCOMPAT(no_holes, NO_HOLES); 204 205 static struct attribute *btrfs_supported_feature_attrs[] = { 206 BTRFS_FEAT_ATTR_PTR(mixed_backref), 207 BTRFS_FEAT_ATTR_PTR(default_subvol), 208 BTRFS_FEAT_ATTR_PTR(mixed_groups), 209 BTRFS_FEAT_ATTR_PTR(compress_lzo), 210 BTRFS_FEAT_ATTR_PTR(big_metadata), 211 BTRFS_FEAT_ATTR_PTR(extended_iref), 212 BTRFS_FEAT_ATTR_PTR(raid56), 213 BTRFS_FEAT_ATTR_PTR(skinny_metadata), 214 BTRFS_FEAT_ATTR_PTR(no_holes), 215 NULL 216 }; 217 218 static const struct attribute_group btrfs_feature_attr_group = { 219 .name = "features", 220 .is_visible = btrfs_feature_visible, 221 .attrs = btrfs_supported_feature_attrs, 222 }; 223 224 static ssize_t btrfs_show_u64(u64 *value_ptr, spinlock_t *lock, char *buf) 225 { 226 u64 val; 227 if (lock) 228 spin_lock(lock); 229 val = *value_ptr; 230 if (lock) 231 spin_unlock(lock); 232 return snprintf(buf, PAGE_SIZE, "%llu\n", val); 233 } 234 235 static ssize_t global_rsv_size_show(struct kobject *kobj, 236 struct kobj_attribute *ka, char *buf) 237 { 238 struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); 239 struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 240 return btrfs_show_u64(&block_rsv->size, &block_rsv->lock, buf); 241 } 242 BTRFS_ATTR(global_rsv_size, global_rsv_size_show); 243 244 static ssize_t global_rsv_reserved_show(struct kobject *kobj, 245 struct kobj_attribute *a, char *buf) 246 { 247 struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); 248 struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 249 return btrfs_show_u64(&block_rsv->reserved, &block_rsv->lock, buf); 250 } 251 BTRFS_ATTR(global_rsv_reserved, global_rsv_reserved_show); 252 253 #define to_space_info(_kobj) container_of(_kobj, struct btrfs_space_info, kobj) 254 #define to_raid_kobj(_kobj) container_of(_kobj, struct raid_kobject, kobj) 255 256 static ssize_t raid_bytes_show(struct kobject *kobj, 257 struct kobj_attribute *attr, char *buf); 258 BTRFS_RAID_ATTR(total_bytes, raid_bytes_show); 259 BTRFS_RAID_ATTR(used_bytes, raid_bytes_show); 260 261 static ssize_t raid_bytes_show(struct kobject *kobj, 262 struct kobj_attribute *attr, char *buf) 263 264 { 265 struct btrfs_space_info *sinfo = to_space_info(kobj->parent); 266 struct btrfs_block_group_cache *block_group; 267 int index = to_raid_kobj(kobj)->raid_type; 268 u64 val = 0; 269 270 down_read(&sinfo->groups_sem); 271 list_for_each_entry(block_group, &sinfo->block_groups[index], list) { 272 if (&attr->attr == BTRFS_RAID_ATTR_PTR(total_bytes)) 273 val += block_group->key.offset; 274 else 275 val += btrfs_block_group_used(&block_group->item); 276 } 277 up_read(&sinfo->groups_sem); 278 return snprintf(buf, PAGE_SIZE, "%llu\n", val); 279 } 280 281 static struct attribute *raid_attributes[] = { 282 BTRFS_RAID_ATTR_PTR(total_bytes), 283 BTRFS_RAID_ATTR_PTR(used_bytes), 284 NULL 285 }; 286 287 static void release_raid_kobj(struct kobject *kobj) 288 { 289 kfree(to_raid_kobj(kobj)); 290 } 291 292 struct kobj_type btrfs_raid_ktype = { 293 .sysfs_ops = &kobj_sysfs_ops, 294 .release = release_raid_kobj, 295 .default_attrs = raid_attributes, 296 }; 297 298 #define SPACE_INFO_ATTR(field) \ 299 static ssize_t btrfs_space_info_show_##field(struct kobject *kobj, \ 300 struct kobj_attribute *a, \ 301 char *buf) \ 302 { \ 303 struct btrfs_space_info *sinfo = to_space_info(kobj); \ 304 return btrfs_show_u64(&sinfo->field, &sinfo->lock, buf); \ 305 } \ 306 BTRFS_ATTR(field, btrfs_space_info_show_##field) 307 308 static ssize_t btrfs_space_info_show_total_bytes_pinned(struct kobject *kobj, 309 struct kobj_attribute *a, 310 char *buf) 311 { 312 struct btrfs_space_info *sinfo = to_space_info(kobj); 313 s64 val = percpu_counter_sum(&sinfo->total_bytes_pinned); 314 return snprintf(buf, PAGE_SIZE, "%lld\n", val); 315 } 316 317 SPACE_INFO_ATTR(flags); 318 SPACE_INFO_ATTR(total_bytes); 319 SPACE_INFO_ATTR(bytes_used); 320 SPACE_INFO_ATTR(bytes_pinned); 321 SPACE_INFO_ATTR(bytes_reserved); 322 SPACE_INFO_ATTR(bytes_may_use); 323 SPACE_INFO_ATTR(disk_used); 324 SPACE_INFO_ATTR(disk_total); 325 BTRFS_ATTR(total_bytes_pinned, btrfs_space_info_show_total_bytes_pinned); 326 327 static struct attribute *space_info_attrs[] = { 328 BTRFS_ATTR_PTR(flags), 329 BTRFS_ATTR_PTR(total_bytes), 330 BTRFS_ATTR_PTR(bytes_used), 331 BTRFS_ATTR_PTR(bytes_pinned), 332 BTRFS_ATTR_PTR(bytes_reserved), 333 BTRFS_ATTR_PTR(bytes_may_use), 334 BTRFS_ATTR_PTR(disk_used), 335 BTRFS_ATTR_PTR(disk_total), 336 BTRFS_ATTR_PTR(total_bytes_pinned), 337 NULL, 338 }; 339 340 static void space_info_release(struct kobject *kobj) 341 { 342 struct btrfs_space_info *sinfo = to_space_info(kobj); 343 percpu_counter_destroy(&sinfo->total_bytes_pinned); 344 kfree(sinfo); 345 } 346 347 struct kobj_type space_info_ktype = { 348 .sysfs_ops = &kobj_sysfs_ops, 349 .release = space_info_release, 350 .default_attrs = space_info_attrs, 351 }; 352 353 static const struct attribute *allocation_attrs[] = { 354 BTRFS_ATTR_PTR(global_rsv_reserved), 355 BTRFS_ATTR_PTR(global_rsv_size), 356 NULL, 357 }; 358 359 static ssize_t btrfs_label_show(struct kobject *kobj, 360 struct kobj_attribute *a, char *buf) 361 { 362 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 363 char *label = fs_info->super_copy->label; 364 return snprintf(buf, PAGE_SIZE, label[0] ? "%s\n" : "%s", label); 365 } 366 367 static ssize_t btrfs_label_store(struct kobject *kobj, 368 struct kobj_attribute *a, 369 const char *buf, size_t len) 370 { 371 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 372 size_t p_len; 373 374 if (fs_info->sb->s_flags & MS_RDONLY) 375 return -EROFS; 376 377 /* 378 * p_len is the len until the first occurrence of either 379 * '\n' or '\0' 380 */ 381 p_len = strcspn(buf, "\n"); 382 383 if (p_len >= BTRFS_LABEL_SIZE) 384 return -EINVAL; 385 386 spin_lock(&fs_info->super_lock); 387 memset(fs_info->super_copy->label, 0, BTRFS_LABEL_SIZE); 388 memcpy(fs_info->super_copy->label, buf, p_len); 389 spin_unlock(&fs_info->super_lock); 390 391 /* 392 * We don't want to do full transaction commit from inside sysfs 393 */ 394 btrfs_set_pending(fs_info, COMMIT); 395 wake_up_process(fs_info->transaction_kthread); 396 397 return len; 398 } 399 BTRFS_ATTR_RW(label, btrfs_label_show, btrfs_label_store); 400 401 static ssize_t btrfs_nodesize_show(struct kobject *kobj, 402 struct kobj_attribute *a, char *buf) 403 { 404 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 405 406 return snprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->nodesize); 407 } 408 409 BTRFS_ATTR(nodesize, btrfs_nodesize_show); 410 411 static ssize_t btrfs_sectorsize_show(struct kobject *kobj, 412 struct kobj_attribute *a, char *buf) 413 { 414 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 415 416 return snprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->sectorsize); 417 } 418 419 BTRFS_ATTR(sectorsize, btrfs_sectorsize_show); 420 421 static ssize_t btrfs_clone_alignment_show(struct kobject *kobj, 422 struct kobj_attribute *a, char *buf) 423 { 424 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 425 426 return snprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->sectorsize); 427 } 428 429 BTRFS_ATTR(clone_alignment, btrfs_clone_alignment_show); 430 431 static struct attribute *btrfs_attrs[] = { 432 BTRFS_ATTR_PTR(label), 433 BTRFS_ATTR_PTR(nodesize), 434 BTRFS_ATTR_PTR(sectorsize), 435 BTRFS_ATTR_PTR(clone_alignment), 436 NULL, 437 }; 438 439 static void btrfs_release_super_kobj(struct kobject *kobj) 440 { 441 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 442 complete(&fs_info->kobj_unregister); 443 } 444 445 static struct kobj_type btrfs_ktype = { 446 .sysfs_ops = &kobj_sysfs_ops, 447 .release = btrfs_release_super_kobj, 448 .default_attrs = btrfs_attrs, 449 }; 450 451 static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj) 452 { 453 if (kobj->ktype != &btrfs_ktype) 454 return NULL; 455 return container_of(kobj, struct btrfs_fs_info, super_kobj); 456 } 457 458 #define NUM_FEATURE_BITS 64 459 static char btrfs_unknown_feature_names[3][NUM_FEATURE_BITS][13]; 460 static struct btrfs_feature_attr btrfs_feature_attrs[3][NUM_FEATURE_BITS]; 461 462 static u64 supported_feature_masks[3] = { 463 [FEAT_COMPAT] = BTRFS_FEATURE_COMPAT_SUPP, 464 [FEAT_COMPAT_RO] = BTRFS_FEATURE_COMPAT_RO_SUPP, 465 [FEAT_INCOMPAT] = BTRFS_FEATURE_INCOMPAT_SUPP, 466 }; 467 468 static int addrm_unknown_feature_attrs(struct btrfs_fs_info *fs_info, bool add) 469 { 470 int set; 471 472 for (set = 0; set < FEAT_MAX; set++) { 473 int i; 474 struct attribute *attrs[2]; 475 struct attribute_group agroup = { 476 .name = "features", 477 .attrs = attrs, 478 }; 479 u64 features = get_features(fs_info, set); 480 features &= ~supported_feature_masks[set]; 481 482 if (!features) 483 continue; 484 485 attrs[1] = NULL; 486 for (i = 0; i < NUM_FEATURE_BITS; i++) { 487 struct btrfs_feature_attr *fa; 488 489 if (!(features & (1ULL << i))) 490 continue; 491 492 fa = &btrfs_feature_attrs[set][i]; 493 attrs[0] = &fa->kobj_attr.attr; 494 if (add) { 495 int ret; 496 ret = sysfs_merge_group(&fs_info->super_kobj, 497 &agroup); 498 if (ret) 499 return ret; 500 } else 501 sysfs_unmerge_group(&fs_info->super_kobj, 502 &agroup); 503 } 504 505 } 506 return 0; 507 } 508 509 static void __btrfs_sysfs_remove_one(struct btrfs_fs_info *fs_info) 510 { 511 kobject_del(&fs_info->super_kobj); 512 kobject_put(&fs_info->super_kobj); 513 wait_for_completion(&fs_info->kobj_unregister); 514 } 515 516 void btrfs_sysfs_remove_one(struct btrfs_fs_info *fs_info) 517 { 518 if (fs_info->space_info_kobj) { 519 sysfs_remove_files(fs_info->space_info_kobj, allocation_attrs); 520 kobject_del(fs_info->space_info_kobj); 521 kobject_put(fs_info->space_info_kobj); 522 } 523 kobject_del(fs_info->device_dir_kobj); 524 kobject_put(fs_info->device_dir_kobj); 525 addrm_unknown_feature_attrs(fs_info, false); 526 sysfs_remove_group(&fs_info->super_kobj, &btrfs_feature_attr_group); 527 __btrfs_sysfs_remove_one(fs_info); 528 } 529 530 const char * const btrfs_feature_set_names[3] = { 531 [FEAT_COMPAT] = "compat", 532 [FEAT_COMPAT_RO] = "compat_ro", 533 [FEAT_INCOMPAT] = "incompat", 534 }; 535 536 char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags) 537 { 538 size_t bufsize = 4096; /* safe max, 64 names * 64 bytes */ 539 int len = 0; 540 int i; 541 char *str; 542 543 str = kmalloc(bufsize, GFP_KERNEL); 544 if (!str) 545 return str; 546 547 for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { 548 const char *name; 549 550 if (!(flags & (1ULL << i))) 551 continue; 552 553 name = btrfs_feature_attrs[set][i].kobj_attr.attr.name; 554 len += snprintf(str + len, bufsize - len, "%s%s", 555 len ? "," : "", name); 556 } 557 558 return str; 559 } 560 561 static void init_feature_attrs(void) 562 { 563 struct btrfs_feature_attr *fa; 564 int set, i; 565 566 BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names) != 567 ARRAY_SIZE(btrfs_feature_attrs)); 568 BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names[0]) != 569 ARRAY_SIZE(btrfs_feature_attrs[0])); 570 571 memset(btrfs_feature_attrs, 0, sizeof(btrfs_feature_attrs)); 572 memset(btrfs_unknown_feature_names, 0, 573 sizeof(btrfs_unknown_feature_names)); 574 575 for (i = 0; btrfs_supported_feature_attrs[i]; i++) { 576 struct btrfs_feature_attr *sfa; 577 struct attribute *a = btrfs_supported_feature_attrs[i]; 578 int bit; 579 sfa = attr_to_btrfs_feature_attr(a); 580 bit = ilog2(sfa->feature_bit); 581 fa = &btrfs_feature_attrs[sfa->feature_set][bit]; 582 583 fa->kobj_attr.attr.name = sfa->kobj_attr.attr.name; 584 } 585 586 for (set = 0; set < FEAT_MAX; set++) { 587 for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { 588 char *name = btrfs_unknown_feature_names[set][i]; 589 fa = &btrfs_feature_attrs[set][i]; 590 591 if (fa->kobj_attr.attr.name) 592 continue; 593 594 snprintf(name, 13, "%s:%u", 595 btrfs_feature_set_names[set], i); 596 597 fa->kobj_attr.attr.name = name; 598 fa->kobj_attr.attr.mode = S_IRUGO; 599 fa->feature_set = set; 600 fa->feature_bit = 1ULL << i; 601 } 602 } 603 } 604 605 int btrfs_kobj_rm_device(struct btrfs_fs_info *fs_info, 606 struct btrfs_device *one_device) 607 { 608 struct hd_struct *disk; 609 struct kobject *disk_kobj; 610 611 if (!fs_info->device_dir_kobj) 612 return -EINVAL; 613 614 if (one_device && one_device->bdev) { 615 disk = one_device->bdev->bd_part; 616 disk_kobj = &part_to_dev(disk)->kobj; 617 618 sysfs_remove_link(fs_info->device_dir_kobj, 619 disk_kobj->name); 620 } 621 622 return 0; 623 } 624 625 int btrfs_kobj_add_device(struct btrfs_fs_info *fs_info, 626 struct btrfs_device *one_device) 627 { 628 int error = 0; 629 struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; 630 struct btrfs_device *dev; 631 632 if (!fs_info->device_dir_kobj) 633 fs_info->device_dir_kobj = kobject_create_and_add("devices", 634 &fs_info->super_kobj); 635 636 if (!fs_info->device_dir_kobj) 637 return -ENOMEM; 638 639 list_for_each_entry(dev, &fs_devices->devices, dev_list) { 640 struct hd_struct *disk; 641 struct kobject *disk_kobj; 642 643 if (!dev->bdev) 644 continue; 645 646 if (one_device && one_device != dev) 647 continue; 648 649 disk = dev->bdev->bd_part; 650 disk_kobj = &part_to_dev(disk)->kobj; 651 652 error = sysfs_create_link(fs_info->device_dir_kobj, 653 disk_kobj, disk_kobj->name); 654 if (error) 655 break; 656 } 657 658 return error; 659 } 660 661 /* /sys/fs/btrfs/ entry */ 662 static struct kset *btrfs_kset; 663 664 /* /sys/kernel/debug/btrfs */ 665 static struct dentry *btrfs_debugfs_root_dentry; 666 667 /* Debugging tunables and exported data */ 668 u64 btrfs_debugfs_test; 669 670 int btrfs_sysfs_add_one(struct btrfs_fs_info *fs_info) 671 { 672 int error; 673 674 init_completion(&fs_info->kobj_unregister); 675 fs_info->super_kobj.kset = btrfs_kset; 676 error = kobject_init_and_add(&fs_info->super_kobj, &btrfs_ktype, NULL, 677 "%pU", fs_info->fsid); 678 if (error) 679 return error; 680 681 error = sysfs_create_group(&fs_info->super_kobj, 682 &btrfs_feature_attr_group); 683 if (error) { 684 __btrfs_sysfs_remove_one(fs_info); 685 return error; 686 } 687 688 error = addrm_unknown_feature_attrs(fs_info, true); 689 if (error) 690 goto failure; 691 692 error = btrfs_kobj_add_device(fs_info, NULL); 693 if (error) 694 goto failure; 695 696 fs_info->space_info_kobj = kobject_create_and_add("allocation", 697 &fs_info->super_kobj); 698 if (!fs_info->space_info_kobj) { 699 error = -ENOMEM; 700 goto failure; 701 } 702 703 error = sysfs_create_files(fs_info->space_info_kobj, allocation_attrs); 704 if (error) 705 goto failure; 706 707 return 0; 708 failure: 709 btrfs_sysfs_remove_one(fs_info); 710 return error; 711 } 712 713 static int btrfs_init_debugfs(void) 714 { 715 #ifdef CONFIG_DEBUG_FS 716 btrfs_debugfs_root_dentry = debugfs_create_dir("btrfs", NULL); 717 if (!btrfs_debugfs_root_dentry) 718 return -ENOMEM; 719 720 debugfs_create_u64("test", S_IRUGO | S_IWUGO, btrfs_debugfs_root_dentry, 721 &btrfs_debugfs_test); 722 #endif 723 return 0; 724 } 725 726 int btrfs_init_sysfs(void) 727 { 728 int ret; 729 730 btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj); 731 if (!btrfs_kset) 732 return -ENOMEM; 733 734 ret = btrfs_init_debugfs(); 735 if (ret) 736 return ret; 737 738 init_feature_attrs(); 739 ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); 740 741 return ret; 742 } 743 744 void btrfs_exit_sysfs(void) 745 { 746 sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); 747 kset_unregister(btrfs_kset); 748 debugfs_remove_recursive(btrfs_debugfs_root_dentry); 749 } 750 751