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 static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj); 37 38 static u64 get_features(struct btrfs_fs_info *fs_info, 39 enum btrfs_feature_set set) 40 { 41 struct btrfs_super_block *disk_super = fs_info->super_copy; 42 if (set == FEAT_COMPAT) 43 return btrfs_super_compat_flags(disk_super); 44 else if (set == FEAT_COMPAT_RO) 45 return btrfs_super_compat_ro_flags(disk_super); 46 else 47 return btrfs_super_incompat_flags(disk_super); 48 } 49 50 static void set_features(struct btrfs_fs_info *fs_info, 51 enum btrfs_feature_set set, u64 features) 52 { 53 struct btrfs_super_block *disk_super = fs_info->super_copy; 54 if (set == FEAT_COMPAT) 55 btrfs_set_super_compat_flags(disk_super, features); 56 else if (set == FEAT_COMPAT_RO) 57 btrfs_set_super_compat_ro_flags(disk_super, features); 58 else 59 btrfs_set_super_incompat_flags(disk_super, features); 60 } 61 62 static int can_modify_feature(struct btrfs_feature_attr *fa) 63 { 64 int val = 0; 65 u64 set, clear; 66 switch (fa->feature_set) { 67 case FEAT_COMPAT: 68 set = BTRFS_FEATURE_COMPAT_SAFE_SET; 69 clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR; 70 break; 71 case FEAT_COMPAT_RO: 72 set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET; 73 clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR; 74 break; 75 case FEAT_INCOMPAT: 76 set = BTRFS_FEATURE_INCOMPAT_SAFE_SET; 77 clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR; 78 break; 79 default: 80 printk(KERN_WARNING "btrfs: sysfs: unknown feature set %d\n", 81 fa->feature_set); 82 return 0; 83 } 84 85 if (set & fa->feature_bit) 86 val |= 1; 87 if (clear & fa->feature_bit) 88 val |= 2; 89 90 return val; 91 } 92 93 static ssize_t btrfs_feature_attr_show(struct kobject *kobj, 94 struct kobj_attribute *a, char *buf) 95 { 96 int val = 0; 97 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 98 struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a); 99 if (fs_info) { 100 u64 features = get_features(fs_info, fa->feature_set); 101 if (features & fa->feature_bit) 102 val = 1; 103 } else 104 val = can_modify_feature(fa); 105 106 return snprintf(buf, PAGE_SIZE, "%d\n", val); 107 } 108 109 static ssize_t btrfs_feature_attr_store(struct kobject *kobj, 110 struct kobj_attribute *a, 111 const char *buf, size_t count) 112 { 113 struct btrfs_fs_info *fs_info; 114 struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a); 115 u64 features, set, clear; 116 unsigned long val; 117 int ret; 118 119 fs_info = to_fs_info(kobj); 120 if (!fs_info) 121 return -EPERM; 122 123 ret = kstrtoul(skip_spaces(buf), 0, &val); 124 if (ret) 125 return ret; 126 127 if (fa->feature_set == FEAT_COMPAT) { 128 set = BTRFS_FEATURE_COMPAT_SAFE_SET; 129 clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR; 130 } else if (fa->feature_set == FEAT_COMPAT_RO) { 131 set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET; 132 clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR; 133 } else { 134 set = BTRFS_FEATURE_INCOMPAT_SAFE_SET; 135 clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR; 136 } 137 138 features = get_features(fs_info, fa->feature_set); 139 140 /* Nothing to do */ 141 if ((val && (features & fa->feature_bit)) || 142 (!val && !(features & fa->feature_bit))) 143 return count; 144 145 if ((val && !(set & fa->feature_bit)) || 146 (!val && !(clear & fa->feature_bit))) { 147 btrfs_info(fs_info, 148 "%sabling feature %s on mounted fs is not supported.", 149 val ? "En" : "Dis", fa->kobj_attr.attr.name); 150 return -EPERM; 151 } 152 153 btrfs_info(fs_info, "%s %s feature flag", 154 val ? "Setting" : "Clearing", fa->kobj_attr.attr.name); 155 156 spin_lock(&fs_info->super_lock); 157 features = get_features(fs_info, fa->feature_set); 158 if (val) 159 features |= fa->feature_bit; 160 else 161 features &= ~fa->feature_bit; 162 set_features(fs_info, fa->feature_set, features); 163 spin_unlock(&fs_info->super_lock); 164 165 /* 166 * We don't want to do full transaction commit from inside sysfs 167 */ 168 btrfs_set_pending(fs_info, COMMIT); 169 wake_up_process(fs_info->transaction_kthread); 170 171 return count; 172 } 173 174 static umode_t btrfs_feature_visible(struct kobject *kobj, 175 struct attribute *attr, int unused) 176 { 177 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 178 umode_t mode = attr->mode; 179 180 if (fs_info) { 181 struct btrfs_feature_attr *fa; 182 u64 features; 183 184 fa = attr_to_btrfs_feature_attr(attr); 185 features = get_features(fs_info, fa->feature_set); 186 187 if (can_modify_feature(fa)) 188 mode |= S_IWUSR; 189 else if (!(features & fa->feature_bit)) 190 mode = 0; 191 } 192 193 return mode; 194 } 195 196 BTRFS_FEAT_ATTR_INCOMPAT(mixed_backref, MIXED_BACKREF); 197 BTRFS_FEAT_ATTR_INCOMPAT(default_subvol, DEFAULT_SUBVOL); 198 BTRFS_FEAT_ATTR_INCOMPAT(mixed_groups, MIXED_GROUPS); 199 BTRFS_FEAT_ATTR_INCOMPAT(compress_lzo, COMPRESS_LZO); 200 BTRFS_FEAT_ATTR_INCOMPAT(big_metadata, BIG_METADATA); 201 BTRFS_FEAT_ATTR_INCOMPAT(extended_iref, EXTENDED_IREF); 202 BTRFS_FEAT_ATTR_INCOMPAT(raid56, RAID56); 203 BTRFS_FEAT_ATTR_INCOMPAT(skinny_metadata, SKINNY_METADATA); 204 BTRFS_FEAT_ATTR_INCOMPAT(no_holes, NO_HOLES); 205 206 static struct attribute *btrfs_supported_feature_attrs[] = { 207 BTRFS_FEAT_ATTR_PTR(mixed_backref), 208 BTRFS_FEAT_ATTR_PTR(default_subvol), 209 BTRFS_FEAT_ATTR_PTR(mixed_groups), 210 BTRFS_FEAT_ATTR_PTR(compress_lzo), 211 BTRFS_FEAT_ATTR_PTR(big_metadata), 212 BTRFS_FEAT_ATTR_PTR(extended_iref), 213 BTRFS_FEAT_ATTR_PTR(raid56), 214 BTRFS_FEAT_ATTR_PTR(skinny_metadata), 215 BTRFS_FEAT_ATTR_PTR(no_holes), 216 NULL 217 }; 218 219 static const struct attribute_group btrfs_feature_attr_group = { 220 .name = "features", 221 .is_visible = btrfs_feature_visible, 222 .attrs = btrfs_supported_feature_attrs, 223 }; 224 225 static ssize_t btrfs_show_u64(u64 *value_ptr, spinlock_t *lock, char *buf) 226 { 227 u64 val; 228 if (lock) 229 spin_lock(lock); 230 val = *value_ptr; 231 if (lock) 232 spin_unlock(lock); 233 return snprintf(buf, PAGE_SIZE, "%llu\n", val); 234 } 235 236 static ssize_t global_rsv_size_show(struct kobject *kobj, 237 struct kobj_attribute *ka, char *buf) 238 { 239 struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); 240 struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 241 return btrfs_show_u64(&block_rsv->size, &block_rsv->lock, buf); 242 } 243 BTRFS_ATTR(global_rsv_size, global_rsv_size_show); 244 245 static ssize_t global_rsv_reserved_show(struct kobject *kobj, 246 struct kobj_attribute *a, char *buf) 247 { 248 struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); 249 struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 250 return btrfs_show_u64(&block_rsv->reserved, &block_rsv->lock, buf); 251 } 252 BTRFS_ATTR(global_rsv_reserved, global_rsv_reserved_show); 253 254 #define to_space_info(_kobj) container_of(_kobj, struct btrfs_space_info, kobj) 255 #define to_raid_kobj(_kobj) container_of(_kobj, struct raid_kobject, kobj) 256 257 static ssize_t raid_bytes_show(struct kobject *kobj, 258 struct kobj_attribute *attr, char *buf); 259 BTRFS_RAID_ATTR(total_bytes, raid_bytes_show); 260 BTRFS_RAID_ATTR(used_bytes, raid_bytes_show); 261 262 static ssize_t raid_bytes_show(struct kobject *kobj, 263 struct kobj_attribute *attr, char *buf) 264 265 { 266 struct btrfs_space_info *sinfo = to_space_info(kobj->parent); 267 struct btrfs_block_group_cache *block_group; 268 int index = to_raid_kobj(kobj)->raid_type; 269 u64 val = 0; 270 271 down_read(&sinfo->groups_sem); 272 list_for_each_entry(block_group, &sinfo->block_groups[index], list) { 273 if (&attr->attr == BTRFS_RAID_ATTR_PTR(total_bytes)) 274 val += block_group->key.offset; 275 else 276 val += btrfs_block_group_used(&block_group->item); 277 } 278 up_read(&sinfo->groups_sem); 279 return snprintf(buf, PAGE_SIZE, "%llu\n", val); 280 } 281 282 static struct attribute *raid_attributes[] = { 283 BTRFS_RAID_ATTR_PTR(total_bytes), 284 BTRFS_RAID_ATTR_PTR(used_bytes), 285 NULL 286 }; 287 288 static void release_raid_kobj(struct kobject *kobj) 289 { 290 kfree(to_raid_kobj(kobj)); 291 } 292 293 struct kobj_type btrfs_raid_ktype = { 294 .sysfs_ops = &kobj_sysfs_ops, 295 .release = release_raid_kobj, 296 .default_attrs = raid_attributes, 297 }; 298 299 #define SPACE_INFO_ATTR(field) \ 300 static ssize_t btrfs_space_info_show_##field(struct kobject *kobj, \ 301 struct kobj_attribute *a, \ 302 char *buf) \ 303 { \ 304 struct btrfs_space_info *sinfo = to_space_info(kobj); \ 305 return btrfs_show_u64(&sinfo->field, &sinfo->lock, buf); \ 306 } \ 307 BTRFS_ATTR(field, btrfs_space_info_show_##field) 308 309 static ssize_t btrfs_space_info_show_total_bytes_pinned(struct kobject *kobj, 310 struct kobj_attribute *a, 311 char *buf) 312 { 313 struct btrfs_space_info *sinfo = to_space_info(kobj); 314 s64 val = percpu_counter_sum(&sinfo->total_bytes_pinned); 315 return snprintf(buf, PAGE_SIZE, "%lld\n", val); 316 } 317 318 SPACE_INFO_ATTR(flags); 319 SPACE_INFO_ATTR(total_bytes); 320 SPACE_INFO_ATTR(bytes_used); 321 SPACE_INFO_ATTR(bytes_pinned); 322 SPACE_INFO_ATTR(bytes_reserved); 323 SPACE_INFO_ATTR(bytes_may_use); 324 SPACE_INFO_ATTR(disk_used); 325 SPACE_INFO_ATTR(disk_total); 326 BTRFS_ATTR(total_bytes_pinned, btrfs_space_info_show_total_bytes_pinned); 327 328 static struct attribute *space_info_attrs[] = { 329 BTRFS_ATTR_PTR(flags), 330 BTRFS_ATTR_PTR(total_bytes), 331 BTRFS_ATTR_PTR(bytes_used), 332 BTRFS_ATTR_PTR(bytes_pinned), 333 BTRFS_ATTR_PTR(bytes_reserved), 334 BTRFS_ATTR_PTR(bytes_may_use), 335 BTRFS_ATTR_PTR(disk_used), 336 BTRFS_ATTR_PTR(disk_total), 337 BTRFS_ATTR_PTR(total_bytes_pinned), 338 NULL, 339 }; 340 341 static void space_info_release(struct kobject *kobj) 342 { 343 struct btrfs_space_info *sinfo = to_space_info(kobj); 344 percpu_counter_destroy(&sinfo->total_bytes_pinned); 345 kfree(sinfo); 346 } 347 348 struct kobj_type space_info_ktype = { 349 .sysfs_ops = &kobj_sysfs_ops, 350 .release = space_info_release, 351 .default_attrs = space_info_attrs, 352 }; 353 354 static const struct attribute *allocation_attrs[] = { 355 BTRFS_ATTR_PTR(global_rsv_reserved), 356 BTRFS_ATTR_PTR(global_rsv_size), 357 NULL, 358 }; 359 360 static ssize_t btrfs_label_show(struct kobject *kobj, 361 struct kobj_attribute *a, char *buf) 362 { 363 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 364 char *label = fs_info->super_copy->label; 365 return snprintf(buf, PAGE_SIZE, label[0] ? "%s\n" : "%s", label); 366 } 367 368 static ssize_t btrfs_label_store(struct kobject *kobj, 369 struct kobj_attribute *a, 370 const char *buf, size_t len) 371 { 372 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 373 size_t p_len; 374 375 if (fs_info->sb->s_flags & MS_RDONLY) 376 return -EROFS; 377 378 /* 379 * p_len is the len until the first occurrence of either 380 * '\n' or '\0' 381 */ 382 p_len = strcspn(buf, "\n"); 383 384 if (p_len >= BTRFS_LABEL_SIZE) 385 return -EINVAL; 386 387 spin_lock(&fs_info->super_lock); 388 memset(fs_info->super_copy->label, 0, BTRFS_LABEL_SIZE); 389 memcpy(fs_info->super_copy->label, buf, p_len); 390 spin_unlock(&fs_info->super_lock); 391 392 /* 393 * We don't want to do full transaction commit from inside sysfs 394 */ 395 btrfs_set_pending(fs_info, COMMIT); 396 wake_up_process(fs_info->transaction_kthread); 397 398 return len; 399 } 400 BTRFS_ATTR_RW(label, btrfs_label_show, btrfs_label_store); 401 402 static ssize_t btrfs_nodesize_show(struct kobject *kobj, 403 struct kobj_attribute *a, char *buf) 404 { 405 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 406 407 return snprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->nodesize); 408 } 409 410 BTRFS_ATTR(nodesize, btrfs_nodesize_show); 411 412 static ssize_t btrfs_sectorsize_show(struct kobject *kobj, 413 struct kobj_attribute *a, char *buf) 414 { 415 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 416 417 return snprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->sectorsize); 418 } 419 420 BTRFS_ATTR(sectorsize, btrfs_sectorsize_show); 421 422 static ssize_t btrfs_clone_alignment_show(struct kobject *kobj, 423 struct kobj_attribute *a, char *buf) 424 { 425 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 426 427 return snprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->sectorsize); 428 } 429 430 BTRFS_ATTR(clone_alignment, btrfs_clone_alignment_show); 431 432 static const struct attribute *btrfs_attrs[] = { 433 BTRFS_ATTR_PTR(label), 434 BTRFS_ATTR_PTR(nodesize), 435 BTRFS_ATTR_PTR(sectorsize), 436 BTRFS_ATTR_PTR(clone_alignment), 437 NULL, 438 }; 439 440 static void btrfs_release_super_kobj(struct kobject *kobj) 441 { 442 struct btrfs_fs_devices *fs_devs = to_fs_devs(kobj); 443 444 memset(&fs_devs->super_kobj, 0, sizeof(struct kobject)); 445 complete(&fs_devs->kobj_unregister); 446 } 447 448 static struct kobj_type btrfs_ktype = { 449 .sysfs_ops = &kobj_sysfs_ops, 450 .release = btrfs_release_super_kobj, 451 }; 452 453 static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj) 454 { 455 if (kobj->ktype != &btrfs_ktype) 456 return NULL; 457 return container_of(kobj, struct btrfs_fs_devices, super_kobj); 458 } 459 460 static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj) 461 { 462 if (kobj->ktype != &btrfs_ktype) 463 return NULL; 464 return to_fs_devs(kobj)->fs_info; 465 } 466 467 #define NUM_FEATURE_BITS 64 468 static char btrfs_unknown_feature_names[3][NUM_FEATURE_BITS][13]; 469 static struct btrfs_feature_attr btrfs_feature_attrs[3][NUM_FEATURE_BITS]; 470 471 static const u64 supported_feature_masks[3] = { 472 [FEAT_COMPAT] = BTRFS_FEATURE_COMPAT_SUPP, 473 [FEAT_COMPAT_RO] = BTRFS_FEATURE_COMPAT_RO_SUPP, 474 [FEAT_INCOMPAT] = BTRFS_FEATURE_INCOMPAT_SUPP, 475 }; 476 477 static int addrm_unknown_feature_attrs(struct btrfs_fs_info *fs_info, bool add) 478 { 479 int set; 480 481 for (set = 0; set < FEAT_MAX; set++) { 482 int i; 483 struct attribute *attrs[2]; 484 struct attribute_group agroup = { 485 .name = "features", 486 .attrs = attrs, 487 }; 488 u64 features = get_features(fs_info, set); 489 features &= ~supported_feature_masks[set]; 490 491 if (!features) 492 continue; 493 494 attrs[1] = NULL; 495 for (i = 0; i < NUM_FEATURE_BITS; i++) { 496 struct btrfs_feature_attr *fa; 497 498 if (!(features & (1ULL << i))) 499 continue; 500 501 fa = &btrfs_feature_attrs[set][i]; 502 attrs[0] = &fa->kobj_attr.attr; 503 if (add) { 504 int ret; 505 ret = sysfs_merge_group(&fs_info->fs_devices->super_kobj, 506 &agroup); 507 if (ret) 508 return ret; 509 } else 510 sysfs_unmerge_group(&fs_info->fs_devices->super_kobj, 511 &agroup); 512 } 513 514 } 515 return 0; 516 } 517 518 static void __btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs) 519 { 520 if (fs_devs->device_dir_kobj) { 521 kobject_del(fs_devs->device_dir_kobj); 522 kobject_put(fs_devs->device_dir_kobj); 523 fs_devs->device_dir_kobj = NULL; 524 } 525 526 if (fs_devs->super_kobj.state_initialized) { 527 kobject_del(&fs_devs->super_kobj); 528 kobject_put(&fs_devs->super_kobj); 529 wait_for_completion(&fs_devs->kobj_unregister); 530 } 531 } 532 533 /* when fs_devs is NULL it will remove all fsid kobject */ 534 void btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs) 535 { 536 struct list_head *fs_uuids = btrfs_get_fs_uuids(); 537 538 if (fs_devs) { 539 __btrfs_sysfs_remove_fsid(fs_devs); 540 return; 541 } 542 543 list_for_each_entry(fs_devs, fs_uuids, list) { 544 __btrfs_sysfs_remove_fsid(fs_devs); 545 } 546 } 547 548 void btrfs_sysfs_remove_one(struct btrfs_fs_info *fs_info) 549 { 550 btrfs_reset_fs_info_ptr(fs_info); 551 552 if (fs_info->space_info_kobj) { 553 sysfs_remove_files(fs_info->space_info_kobj, allocation_attrs); 554 kobject_del(fs_info->space_info_kobj); 555 kobject_put(fs_info->space_info_kobj); 556 } 557 addrm_unknown_feature_attrs(fs_info, false); 558 sysfs_remove_group(&fs_info->fs_devices->super_kobj, &btrfs_feature_attr_group); 559 sysfs_remove_files(&fs_info->fs_devices->super_kobj, btrfs_attrs); 560 btrfs_kobj_rm_device(fs_info->fs_devices, NULL); 561 } 562 563 const char * const btrfs_feature_set_names[3] = { 564 [FEAT_COMPAT] = "compat", 565 [FEAT_COMPAT_RO] = "compat_ro", 566 [FEAT_INCOMPAT] = "incompat", 567 }; 568 569 char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags) 570 { 571 size_t bufsize = 4096; /* safe max, 64 names * 64 bytes */ 572 int len = 0; 573 int i; 574 char *str; 575 576 str = kmalloc(bufsize, GFP_KERNEL); 577 if (!str) 578 return str; 579 580 for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { 581 const char *name; 582 583 if (!(flags & (1ULL << i))) 584 continue; 585 586 name = btrfs_feature_attrs[set][i].kobj_attr.attr.name; 587 len += snprintf(str + len, bufsize - len, "%s%s", 588 len ? "," : "", name); 589 } 590 591 return str; 592 } 593 594 static void init_feature_attrs(void) 595 { 596 struct btrfs_feature_attr *fa; 597 int set, i; 598 599 BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names) != 600 ARRAY_SIZE(btrfs_feature_attrs)); 601 BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names[0]) != 602 ARRAY_SIZE(btrfs_feature_attrs[0])); 603 604 memset(btrfs_feature_attrs, 0, sizeof(btrfs_feature_attrs)); 605 memset(btrfs_unknown_feature_names, 0, 606 sizeof(btrfs_unknown_feature_names)); 607 608 for (i = 0; btrfs_supported_feature_attrs[i]; i++) { 609 struct btrfs_feature_attr *sfa; 610 struct attribute *a = btrfs_supported_feature_attrs[i]; 611 int bit; 612 sfa = attr_to_btrfs_feature_attr(a); 613 bit = ilog2(sfa->feature_bit); 614 fa = &btrfs_feature_attrs[sfa->feature_set][bit]; 615 616 fa->kobj_attr.attr.name = sfa->kobj_attr.attr.name; 617 } 618 619 for (set = 0; set < FEAT_MAX; set++) { 620 for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { 621 char *name = btrfs_unknown_feature_names[set][i]; 622 fa = &btrfs_feature_attrs[set][i]; 623 624 if (fa->kobj_attr.attr.name) 625 continue; 626 627 snprintf(name, 13, "%s:%u", 628 btrfs_feature_set_names[set], i); 629 630 fa->kobj_attr.attr.name = name; 631 fa->kobj_attr.attr.mode = S_IRUGO; 632 fa->feature_set = set; 633 fa->feature_bit = 1ULL << i; 634 } 635 } 636 } 637 638 /* when one_device is NULL, it removes all device links */ 639 640 int btrfs_kobj_rm_device(struct btrfs_fs_devices *fs_devices, 641 struct btrfs_device *one_device) 642 { 643 struct hd_struct *disk; 644 struct kobject *disk_kobj; 645 646 if (!fs_devices->device_dir_kobj) 647 return -EINVAL; 648 649 if (one_device && one_device->bdev) { 650 disk = one_device->bdev->bd_part; 651 disk_kobj = &part_to_dev(disk)->kobj; 652 653 sysfs_remove_link(fs_devices->device_dir_kobj, 654 disk_kobj->name); 655 } 656 657 if (one_device) 658 return 0; 659 660 list_for_each_entry(one_device, 661 &fs_devices->devices, dev_list) { 662 if (!one_device->bdev) 663 continue; 664 disk = one_device->bdev->bd_part; 665 disk_kobj = &part_to_dev(disk)->kobj; 666 667 sysfs_remove_link(fs_devices->device_dir_kobj, 668 disk_kobj->name); 669 } 670 671 return 0; 672 } 673 674 int btrfs_sysfs_add_device(struct btrfs_fs_devices *fs_devs) 675 { 676 if (!fs_devs->device_dir_kobj) 677 fs_devs->device_dir_kobj = kobject_create_and_add("devices", 678 &fs_devs->super_kobj); 679 680 if (!fs_devs->device_dir_kobj) 681 return -ENOMEM; 682 683 return 0; 684 } 685 686 int btrfs_kobj_add_device(struct btrfs_fs_devices *fs_devices, 687 struct btrfs_device *one_device) 688 { 689 int error = 0; 690 struct btrfs_device *dev; 691 692 list_for_each_entry(dev, &fs_devices->devices, dev_list) { 693 struct hd_struct *disk; 694 struct kobject *disk_kobj; 695 696 if (!dev->bdev) 697 continue; 698 699 if (one_device && one_device != dev) 700 continue; 701 702 disk = dev->bdev->bd_part; 703 disk_kobj = &part_to_dev(disk)->kobj; 704 705 error = sysfs_create_link(fs_devices->device_dir_kobj, 706 disk_kobj, disk_kobj->name); 707 if (error) 708 break; 709 } 710 711 return error; 712 } 713 714 /* /sys/fs/btrfs/ entry */ 715 static struct kset *btrfs_kset; 716 717 /* /sys/kernel/debug/btrfs */ 718 static struct dentry *btrfs_debugfs_root_dentry; 719 720 /* Debugging tunables and exported data */ 721 u64 btrfs_debugfs_test; 722 723 /* 724 * Can be called by the device discovery thread. 725 * And parent can be specified for seed device 726 */ 727 int btrfs_sysfs_add_fsid(struct btrfs_fs_devices *fs_devs, 728 struct kobject *parent) 729 { 730 int error; 731 732 init_completion(&fs_devs->kobj_unregister); 733 fs_devs->super_kobj.kset = btrfs_kset; 734 error = kobject_init_and_add(&fs_devs->super_kobj, 735 &btrfs_ktype, parent, "%pU", fs_devs->fsid); 736 return error; 737 } 738 739 int btrfs_sysfs_add_one(struct btrfs_fs_info *fs_info) 740 { 741 int error; 742 struct btrfs_fs_devices *fs_devs = fs_info->fs_devices; 743 struct kobject *super_kobj = &fs_devs->super_kobj; 744 745 btrfs_set_fs_info_ptr(fs_info); 746 747 error = btrfs_kobj_add_device(fs_devs, NULL); 748 if (error) 749 return error; 750 751 error = sysfs_create_files(super_kobj, btrfs_attrs); 752 if (error) { 753 btrfs_kobj_rm_device(fs_devs, NULL); 754 return error; 755 } 756 757 error = sysfs_create_group(super_kobj, 758 &btrfs_feature_attr_group); 759 if (error) 760 goto failure; 761 762 error = addrm_unknown_feature_attrs(fs_info, true); 763 if (error) 764 goto failure; 765 766 fs_info->space_info_kobj = kobject_create_and_add("allocation", 767 super_kobj); 768 if (!fs_info->space_info_kobj) { 769 error = -ENOMEM; 770 goto failure; 771 } 772 773 error = sysfs_create_files(fs_info->space_info_kobj, allocation_attrs); 774 if (error) 775 goto failure; 776 777 return 0; 778 failure: 779 btrfs_sysfs_remove_one(fs_info); 780 return error; 781 } 782 783 static int btrfs_init_debugfs(void) 784 { 785 #ifdef CONFIG_DEBUG_FS 786 btrfs_debugfs_root_dentry = debugfs_create_dir("btrfs", NULL); 787 if (!btrfs_debugfs_root_dentry) 788 return -ENOMEM; 789 790 debugfs_create_u64("test", S_IRUGO | S_IWUGO, btrfs_debugfs_root_dentry, 791 &btrfs_debugfs_test); 792 #endif 793 return 0; 794 } 795 796 int btrfs_init_sysfs(void) 797 { 798 int ret; 799 800 btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj); 801 if (!btrfs_kset) 802 return -ENOMEM; 803 804 ret = btrfs_init_debugfs(); 805 if (ret) 806 goto out1; 807 808 init_feature_attrs(); 809 ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); 810 if (ret) 811 goto out2; 812 813 return 0; 814 out2: 815 debugfs_remove_recursive(btrfs_debugfs_root_dentry); 816 out1: 817 kset_unregister(btrfs_kset); 818 819 return ret; 820 } 821 822 void btrfs_exit_sysfs(void) 823 { 824 sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); 825 kset_unregister(btrfs_kset); 826 debugfs_remove_recursive(btrfs_debugfs_root_dentry); 827 } 828 829