1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2007 Oracle. All rights reserved. 4 */ 5 6 #include <linux/sched.h> 7 #include <linux/sched/mm.h> 8 #include <linux/slab.h> 9 #include <linux/spinlock.h> 10 #include <linux/completion.h> 11 #include <linux/bug.h> 12 #include <linux/list.h> 13 #include <crypto/hash.h> 14 #include "messages.h" 15 #include "ctree.h" 16 #include "discard.h" 17 #include "disk-io.h" 18 #include "send.h" 19 #include "transaction.h" 20 #include "sysfs.h" 21 #include "volumes.h" 22 #include "space-info.h" 23 #include "block-group.h" 24 #include "qgroup.h" 25 #include "misc.h" 26 #include "fs.h" 27 #include "accessors.h" 28 29 /* 30 * Structure name Path 31 * -------------------------------------------------------------------------- 32 * btrfs_supported_static_feature_attrs /sys/fs/btrfs/features 33 * btrfs_supported_feature_attrs /sys/fs/btrfs/features and 34 * /sys/fs/btrfs/<uuid>/features 35 * btrfs_attrs /sys/fs/btrfs/<uuid> 36 * devid_attrs /sys/fs/btrfs/<uuid>/devinfo/<devid> 37 * allocation_attrs /sys/fs/btrfs/<uuid>/allocation 38 * qgroup_attrs /sys/fs/btrfs/<uuid>/qgroups/<level>_<qgroupid> 39 * space_info_attrs /sys/fs/btrfs/<uuid>/allocation/<bg-type> 40 * raid_attrs /sys/fs/btrfs/<uuid>/allocation/<bg-type>/<bg-profile> 41 * discard_attrs /sys/fs/btrfs/<uuid>/discard 42 * 43 * When built with BTRFS_CONFIG_DEBUG: 44 * 45 * btrfs_debug_feature_attrs /sys/fs/btrfs/debug 46 * btrfs_debug_mount_attrs /sys/fs/btrfs/<uuid>/debug 47 */ 48 49 struct btrfs_feature_attr { 50 struct kobj_attribute kobj_attr; 51 enum btrfs_feature_set feature_set; 52 u64 feature_bit; 53 }; 54 55 /* For raid type sysfs entries */ 56 struct raid_kobject { 57 u64 flags; 58 struct kobject kobj; 59 }; 60 61 #define __INIT_KOBJ_ATTR(_name, _mode, _show, _store) \ 62 { \ 63 .attr = { .name = __stringify(_name), .mode = _mode }, \ 64 .show = _show, \ 65 .store = _store, \ 66 } 67 68 #define BTRFS_ATTR_W(_prefix, _name, _store) \ 69 static struct kobj_attribute btrfs_attr_##_prefix##_##_name = \ 70 __INIT_KOBJ_ATTR(_name, 0200, NULL, _store) 71 72 #define BTRFS_ATTR_RW(_prefix, _name, _show, _store) \ 73 static struct kobj_attribute btrfs_attr_##_prefix##_##_name = \ 74 __INIT_KOBJ_ATTR(_name, 0644, _show, _store) 75 76 #define BTRFS_ATTR(_prefix, _name, _show) \ 77 static struct kobj_attribute btrfs_attr_##_prefix##_##_name = \ 78 __INIT_KOBJ_ATTR(_name, 0444, _show, NULL) 79 80 #define BTRFS_ATTR_PTR(_prefix, _name) \ 81 (&btrfs_attr_##_prefix##_##_name.attr) 82 83 #define BTRFS_FEAT_ATTR(_name, _feature_set, _feature_prefix, _feature_bit) \ 84 static struct btrfs_feature_attr btrfs_attr_features_##_name = { \ 85 .kobj_attr = __INIT_KOBJ_ATTR(_name, S_IRUGO, \ 86 btrfs_feature_attr_show, \ 87 btrfs_feature_attr_store), \ 88 .feature_set = _feature_set, \ 89 .feature_bit = _feature_prefix ##_## _feature_bit, \ 90 } 91 #define BTRFS_FEAT_ATTR_PTR(_name) \ 92 (&btrfs_attr_features_##_name.kobj_attr.attr) 93 94 #define BTRFS_FEAT_ATTR_COMPAT(name, feature) \ 95 BTRFS_FEAT_ATTR(name, FEAT_COMPAT, BTRFS_FEATURE_COMPAT, feature) 96 #define BTRFS_FEAT_ATTR_COMPAT_RO(name, feature) \ 97 BTRFS_FEAT_ATTR(name, FEAT_COMPAT_RO, BTRFS_FEATURE_COMPAT_RO, feature) 98 #define BTRFS_FEAT_ATTR_INCOMPAT(name, feature) \ 99 BTRFS_FEAT_ATTR(name, FEAT_INCOMPAT, BTRFS_FEATURE_INCOMPAT, feature) 100 101 static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj); 102 static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj); 103 static struct kobject *get_btrfs_kobj(struct kobject *kobj); 104 105 static struct btrfs_feature_attr *to_btrfs_feature_attr(struct kobj_attribute *a) 106 { 107 return container_of(a, struct btrfs_feature_attr, kobj_attr); 108 } 109 110 static struct kobj_attribute *attr_to_btrfs_attr(struct attribute *attr) 111 { 112 return container_of(attr, struct kobj_attribute, attr); 113 } 114 115 static struct btrfs_feature_attr *attr_to_btrfs_feature_attr( 116 struct attribute *attr) 117 { 118 return to_btrfs_feature_attr(attr_to_btrfs_attr(attr)); 119 } 120 121 static u64 get_features(struct btrfs_fs_info *fs_info, 122 enum btrfs_feature_set set) 123 { 124 struct btrfs_super_block *disk_super = fs_info->super_copy; 125 if (set == FEAT_COMPAT) 126 return btrfs_super_compat_flags(disk_super); 127 else if (set == FEAT_COMPAT_RO) 128 return btrfs_super_compat_ro_flags(disk_super); 129 else 130 return btrfs_super_incompat_flags(disk_super); 131 } 132 133 static void set_features(struct btrfs_fs_info *fs_info, 134 enum btrfs_feature_set set, u64 features) 135 { 136 struct btrfs_super_block *disk_super = fs_info->super_copy; 137 if (set == FEAT_COMPAT) 138 btrfs_set_super_compat_flags(disk_super, features); 139 else if (set == FEAT_COMPAT_RO) 140 btrfs_set_super_compat_ro_flags(disk_super, features); 141 else 142 btrfs_set_super_incompat_flags(disk_super, features); 143 } 144 145 static int can_modify_feature(struct btrfs_feature_attr *fa) 146 { 147 int val = 0; 148 u64 set, clear; 149 switch (fa->feature_set) { 150 case FEAT_COMPAT: 151 set = BTRFS_FEATURE_COMPAT_SAFE_SET; 152 clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR; 153 break; 154 case FEAT_COMPAT_RO: 155 set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET; 156 clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR; 157 break; 158 case FEAT_INCOMPAT: 159 set = BTRFS_FEATURE_INCOMPAT_SAFE_SET; 160 clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR; 161 break; 162 default: 163 pr_warn("btrfs: sysfs: unknown feature set %d\n", 164 fa->feature_set); 165 return 0; 166 } 167 168 if (set & fa->feature_bit) 169 val |= 1; 170 if (clear & fa->feature_bit) 171 val |= 2; 172 173 return val; 174 } 175 176 static ssize_t btrfs_feature_attr_show(struct kobject *kobj, 177 struct kobj_attribute *a, char *buf) 178 { 179 int val = 0; 180 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 181 struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a); 182 if (fs_info) { 183 u64 features = get_features(fs_info, fa->feature_set); 184 if (features & fa->feature_bit) 185 val = 1; 186 } else 187 val = can_modify_feature(fa); 188 189 return sysfs_emit(buf, "%d\n", val); 190 } 191 192 static ssize_t btrfs_feature_attr_store(struct kobject *kobj, 193 struct kobj_attribute *a, 194 const char *buf, size_t count) 195 { 196 struct btrfs_fs_info *fs_info; 197 struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a); 198 u64 features, set, clear; 199 unsigned long val; 200 int ret; 201 202 fs_info = to_fs_info(kobj); 203 if (!fs_info) 204 return -EPERM; 205 206 if (sb_rdonly(fs_info->sb)) 207 return -EROFS; 208 209 ret = kstrtoul(skip_spaces(buf), 0, &val); 210 if (ret) 211 return ret; 212 213 if (fa->feature_set == FEAT_COMPAT) { 214 set = BTRFS_FEATURE_COMPAT_SAFE_SET; 215 clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR; 216 } else if (fa->feature_set == FEAT_COMPAT_RO) { 217 set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET; 218 clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR; 219 } else { 220 set = BTRFS_FEATURE_INCOMPAT_SAFE_SET; 221 clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR; 222 } 223 224 features = get_features(fs_info, fa->feature_set); 225 226 /* Nothing to do */ 227 if ((val && (features & fa->feature_bit)) || 228 (!val && !(features & fa->feature_bit))) 229 return count; 230 231 if ((val && !(set & fa->feature_bit)) || 232 (!val && !(clear & fa->feature_bit))) { 233 btrfs_info(fs_info, 234 "%sabling feature %s on mounted fs is not supported.", 235 val ? "En" : "Dis", fa->kobj_attr.attr.name); 236 return -EPERM; 237 } 238 239 btrfs_info(fs_info, "%s %s feature flag", 240 val ? "Setting" : "Clearing", fa->kobj_attr.attr.name); 241 242 spin_lock(&fs_info->super_lock); 243 features = get_features(fs_info, fa->feature_set); 244 if (val) 245 features |= fa->feature_bit; 246 else 247 features &= ~fa->feature_bit; 248 set_features(fs_info, fa->feature_set, features); 249 spin_unlock(&fs_info->super_lock); 250 251 /* 252 * We don't want to do full transaction commit from inside sysfs 253 */ 254 set_bit(BTRFS_FS_NEED_TRANS_COMMIT, &fs_info->flags); 255 wake_up_process(fs_info->transaction_kthread); 256 257 return count; 258 } 259 260 static umode_t btrfs_feature_visible(struct kobject *kobj, 261 struct attribute *attr, int unused) 262 { 263 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 264 umode_t mode = attr->mode; 265 266 if (fs_info) { 267 struct btrfs_feature_attr *fa; 268 u64 features; 269 270 fa = attr_to_btrfs_feature_attr(attr); 271 features = get_features(fs_info, fa->feature_set); 272 273 if (can_modify_feature(fa)) 274 mode |= S_IWUSR; 275 else if (!(features & fa->feature_bit)) 276 mode = 0; 277 } 278 279 return mode; 280 } 281 282 BTRFS_FEAT_ATTR_INCOMPAT(default_subvol, DEFAULT_SUBVOL); 283 BTRFS_FEAT_ATTR_INCOMPAT(mixed_groups, MIXED_GROUPS); 284 BTRFS_FEAT_ATTR_INCOMPAT(compress_lzo, COMPRESS_LZO); 285 BTRFS_FEAT_ATTR_INCOMPAT(compress_zstd, COMPRESS_ZSTD); 286 BTRFS_FEAT_ATTR_INCOMPAT(extended_iref, EXTENDED_IREF); 287 BTRFS_FEAT_ATTR_INCOMPAT(raid56, RAID56); 288 BTRFS_FEAT_ATTR_INCOMPAT(skinny_metadata, SKINNY_METADATA); 289 BTRFS_FEAT_ATTR_INCOMPAT(no_holes, NO_HOLES); 290 BTRFS_FEAT_ATTR_INCOMPAT(metadata_uuid, METADATA_UUID); 291 BTRFS_FEAT_ATTR_COMPAT_RO(free_space_tree, FREE_SPACE_TREE); 292 BTRFS_FEAT_ATTR_COMPAT_RO(block_group_tree, BLOCK_GROUP_TREE); 293 BTRFS_FEAT_ATTR_INCOMPAT(raid1c34, RAID1C34); 294 BTRFS_FEAT_ATTR_INCOMPAT(simple_quota, SIMPLE_QUOTA); 295 #ifdef CONFIG_BLK_DEV_ZONED 296 BTRFS_FEAT_ATTR_INCOMPAT(zoned, ZONED); 297 #endif 298 #ifdef CONFIG_BTRFS_DEBUG 299 /* Remove once support for extent tree v2 is feature complete */ 300 BTRFS_FEAT_ATTR_INCOMPAT(extent_tree_v2, EXTENT_TREE_V2); 301 /* Remove once support for raid stripe tree is feature complete. */ 302 BTRFS_FEAT_ATTR_INCOMPAT(raid_stripe_tree, RAID_STRIPE_TREE); 303 #endif 304 #ifdef CONFIG_FS_VERITY 305 BTRFS_FEAT_ATTR_COMPAT_RO(verity, VERITY); 306 #endif 307 308 /* 309 * Features which depend on feature bits and may differ between each fs. 310 * 311 * /sys/fs/btrfs/features - all available features implemented by this version 312 * /sys/fs/btrfs/UUID/features - features of the fs which are enabled or 313 * can be changed on a mounted filesystem. 314 */ 315 static struct attribute *btrfs_supported_feature_attrs[] = { 316 BTRFS_FEAT_ATTR_PTR(default_subvol), 317 BTRFS_FEAT_ATTR_PTR(mixed_groups), 318 BTRFS_FEAT_ATTR_PTR(compress_lzo), 319 BTRFS_FEAT_ATTR_PTR(compress_zstd), 320 BTRFS_FEAT_ATTR_PTR(extended_iref), 321 BTRFS_FEAT_ATTR_PTR(raid56), 322 BTRFS_FEAT_ATTR_PTR(skinny_metadata), 323 BTRFS_FEAT_ATTR_PTR(no_holes), 324 BTRFS_FEAT_ATTR_PTR(metadata_uuid), 325 BTRFS_FEAT_ATTR_PTR(free_space_tree), 326 BTRFS_FEAT_ATTR_PTR(raid1c34), 327 BTRFS_FEAT_ATTR_PTR(block_group_tree), 328 BTRFS_FEAT_ATTR_PTR(simple_quota), 329 #ifdef CONFIG_BLK_DEV_ZONED 330 BTRFS_FEAT_ATTR_PTR(zoned), 331 #endif 332 #ifdef CONFIG_BTRFS_DEBUG 333 BTRFS_FEAT_ATTR_PTR(extent_tree_v2), 334 BTRFS_FEAT_ATTR_PTR(raid_stripe_tree), 335 #endif 336 #ifdef CONFIG_FS_VERITY 337 BTRFS_FEAT_ATTR_PTR(verity), 338 #endif 339 NULL 340 }; 341 342 static const struct attribute_group btrfs_feature_attr_group = { 343 .name = "features", 344 .is_visible = btrfs_feature_visible, 345 .attrs = btrfs_supported_feature_attrs, 346 }; 347 348 static ssize_t rmdir_subvol_show(struct kobject *kobj, 349 struct kobj_attribute *ka, char *buf) 350 { 351 return sysfs_emit(buf, "0\n"); 352 } 353 BTRFS_ATTR(static_feature, rmdir_subvol, rmdir_subvol_show); 354 355 static ssize_t supported_checksums_show(struct kobject *kobj, 356 struct kobj_attribute *a, char *buf) 357 { 358 ssize_t ret = 0; 359 int i; 360 361 for (i = 0; i < btrfs_get_num_csums(); i++) { 362 /* 363 * This "trick" only works as long as 'enum btrfs_csum_type' has 364 * no holes in it 365 */ 366 ret += sysfs_emit_at(buf, ret, "%s%s", (i == 0 ? "" : " "), 367 btrfs_super_csum_name(i)); 368 369 } 370 371 ret += sysfs_emit_at(buf, ret, "\n"); 372 return ret; 373 } 374 BTRFS_ATTR(static_feature, supported_checksums, supported_checksums_show); 375 376 static ssize_t send_stream_version_show(struct kobject *kobj, 377 struct kobj_attribute *ka, char *buf) 378 { 379 return sysfs_emit(buf, "%d\n", BTRFS_SEND_STREAM_VERSION); 380 } 381 BTRFS_ATTR(static_feature, send_stream_version, send_stream_version_show); 382 383 static const char *rescue_opts[] = { 384 "usebackuproot", 385 "nologreplay", 386 "ignorebadroots", 387 "ignoredatacsums", 388 "all", 389 }; 390 391 static ssize_t supported_rescue_options_show(struct kobject *kobj, 392 struct kobj_attribute *a, 393 char *buf) 394 { 395 ssize_t ret = 0; 396 int i; 397 398 for (i = 0; i < ARRAY_SIZE(rescue_opts); i++) 399 ret += sysfs_emit_at(buf, ret, "%s%s", (i ? " " : ""), rescue_opts[i]); 400 ret += sysfs_emit_at(buf, ret, "\n"); 401 return ret; 402 } 403 BTRFS_ATTR(static_feature, supported_rescue_options, 404 supported_rescue_options_show); 405 406 static ssize_t supported_sectorsizes_show(struct kobject *kobj, 407 struct kobj_attribute *a, 408 char *buf) 409 { 410 ssize_t ret = 0; 411 412 /* An artificial limit to only support 4K and PAGE_SIZE */ 413 if (PAGE_SIZE > SZ_4K) 414 ret += sysfs_emit_at(buf, ret, "%u ", SZ_4K); 415 ret += sysfs_emit_at(buf, ret, "%lu\n", PAGE_SIZE); 416 417 return ret; 418 } 419 BTRFS_ATTR(static_feature, supported_sectorsizes, 420 supported_sectorsizes_show); 421 422 static ssize_t acl_show(struct kobject *kobj, struct kobj_attribute *a, char *buf) 423 { 424 return sysfs_emit(buf, "%d\n", !!IS_ENABLED(CONFIG_BTRFS_FS_POSIX_ACL)); 425 } 426 BTRFS_ATTR(static_feature, acl, acl_show); 427 428 static ssize_t temp_fsid_supported_show(struct kobject *kobj, 429 struct kobj_attribute *a, char *buf) 430 { 431 return sysfs_emit(buf, "0\n"); 432 } 433 BTRFS_ATTR(static_feature, temp_fsid, temp_fsid_supported_show); 434 435 /* 436 * Features which only depend on kernel version. 437 * 438 * These are listed in /sys/fs/btrfs/features along with 439 * btrfs_supported_feature_attrs. 440 */ 441 static struct attribute *btrfs_supported_static_feature_attrs[] = { 442 BTRFS_ATTR_PTR(static_feature, acl), 443 BTRFS_ATTR_PTR(static_feature, rmdir_subvol), 444 BTRFS_ATTR_PTR(static_feature, supported_checksums), 445 BTRFS_ATTR_PTR(static_feature, send_stream_version), 446 BTRFS_ATTR_PTR(static_feature, supported_rescue_options), 447 BTRFS_ATTR_PTR(static_feature, supported_sectorsizes), 448 BTRFS_ATTR_PTR(static_feature, temp_fsid), 449 NULL 450 }; 451 452 static const struct attribute_group btrfs_static_feature_attr_group = { 453 .name = "features", 454 .attrs = btrfs_supported_static_feature_attrs, 455 }; 456 457 /* 458 * Discard statistics and tunables 459 */ 460 #define discard_to_fs_info(_kobj) to_fs_info(get_btrfs_kobj(_kobj)) 461 462 static ssize_t btrfs_discardable_bytes_show(struct kobject *kobj, 463 struct kobj_attribute *a, 464 char *buf) 465 { 466 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 467 468 return sysfs_emit(buf, "%lld\n", 469 atomic64_read(&fs_info->discard_ctl.discardable_bytes)); 470 } 471 BTRFS_ATTR(discard, discardable_bytes, btrfs_discardable_bytes_show); 472 473 static ssize_t btrfs_discardable_extents_show(struct kobject *kobj, 474 struct kobj_attribute *a, 475 char *buf) 476 { 477 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 478 479 return sysfs_emit(buf, "%d\n", 480 atomic_read(&fs_info->discard_ctl.discardable_extents)); 481 } 482 BTRFS_ATTR(discard, discardable_extents, btrfs_discardable_extents_show); 483 484 static ssize_t btrfs_discard_bitmap_bytes_show(struct kobject *kobj, 485 struct kobj_attribute *a, 486 char *buf) 487 { 488 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 489 490 return sysfs_emit(buf, "%llu\n", 491 fs_info->discard_ctl.discard_bitmap_bytes); 492 } 493 BTRFS_ATTR(discard, discard_bitmap_bytes, btrfs_discard_bitmap_bytes_show); 494 495 static ssize_t btrfs_discard_bytes_saved_show(struct kobject *kobj, 496 struct kobj_attribute *a, 497 char *buf) 498 { 499 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 500 501 return sysfs_emit(buf, "%lld\n", 502 atomic64_read(&fs_info->discard_ctl.discard_bytes_saved)); 503 } 504 BTRFS_ATTR(discard, discard_bytes_saved, btrfs_discard_bytes_saved_show); 505 506 static ssize_t btrfs_discard_extent_bytes_show(struct kobject *kobj, 507 struct kobj_attribute *a, 508 char *buf) 509 { 510 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 511 512 return sysfs_emit(buf, "%llu\n", 513 fs_info->discard_ctl.discard_extent_bytes); 514 } 515 BTRFS_ATTR(discard, discard_extent_bytes, btrfs_discard_extent_bytes_show); 516 517 static ssize_t btrfs_discard_iops_limit_show(struct kobject *kobj, 518 struct kobj_attribute *a, 519 char *buf) 520 { 521 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 522 523 return sysfs_emit(buf, "%u\n", 524 READ_ONCE(fs_info->discard_ctl.iops_limit)); 525 } 526 527 static ssize_t btrfs_discard_iops_limit_store(struct kobject *kobj, 528 struct kobj_attribute *a, 529 const char *buf, size_t len) 530 { 531 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 532 struct btrfs_discard_ctl *discard_ctl = &fs_info->discard_ctl; 533 u32 iops_limit; 534 int ret; 535 536 ret = kstrtou32(buf, 10, &iops_limit); 537 if (ret) 538 return -EINVAL; 539 540 WRITE_ONCE(discard_ctl->iops_limit, iops_limit); 541 btrfs_discard_calc_delay(discard_ctl); 542 btrfs_discard_schedule_work(discard_ctl, true); 543 return len; 544 } 545 BTRFS_ATTR_RW(discard, iops_limit, btrfs_discard_iops_limit_show, 546 btrfs_discard_iops_limit_store); 547 548 static ssize_t btrfs_discard_kbps_limit_show(struct kobject *kobj, 549 struct kobj_attribute *a, 550 char *buf) 551 { 552 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 553 554 return sysfs_emit(buf, "%u\n", 555 READ_ONCE(fs_info->discard_ctl.kbps_limit)); 556 } 557 558 static ssize_t btrfs_discard_kbps_limit_store(struct kobject *kobj, 559 struct kobj_attribute *a, 560 const char *buf, size_t len) 561 { 562 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 563 struct btrfs_discard_ctl *discard_ctl = &fs_info->discard_ctl; 564 u32 kbps_limit; 565 int ret; 566 567 ret = kstrtou32(buf, 10, &kbps_limit); 568 if (ret) 569 return -EINVAL; 570 571 WRITE_ONCE(discard_ctl->kbps_limit, kbps_limit); 572 btrfs_discard_schedule_work(discard_ctl, true); 573 return len; 574 } 575 BTRFS_ATTR_RW(discard, kbps_limit, btrfs_discard_kbps_limit_show, 576 btrfs_discard_kbps_limit_store); 577 578 static ssize_t btrfs_discard_max_discard_size_show(struct kobject *kobj, 579 struct kobj_attribute *a, 580 char *buf) 581 { 582 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 583 584 return sysfs_emit(buf, "%llu\n", 585 READ_ONCE(fs_info->discard_ctl.max_discard_size)); 586 } 587 588 static ssize_t btrfs_discard_max_discard_size_store(struct kobject *kobj, 589 struct kobj_attribute *a, 590 const char *buf, size_t len) 591 { 592 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 593 struct btrfs_discard_ctl *discard_ctl = &fs_info->discard_ctl; 594 u64 max_discard_size; 595 int ret; 596 597 ret = kstrtou64(buf, 10, &max_discard_size); 598 if (ret) 599 return -EINVAL; 600 601 WRITE_ONCE(discard_ctl->max_discard_size, max_discard_size); 602 603 return len; 604 } 605 BTRFS_ATTR_RW(discard, max_discard_size, btrfs_discard_max_discard_size_show, 606 btrfs_discard_max_discard_size_store); 607 608 /* 609 * Per-filesystem stats for discard (when mounted with discard=async). 610 * 611 * Path: /sys/fs/btrfs/<uuid>/discard/ 612 */ 613 static const struct attribute *discard_attrs[] = { 614 BTRFS_ATTR_PTR(discard, discardable_bytes), 615 BTRFS_ATTR_PTR(discard, discardable_extents), 616 BTRFS_ATTR_PTR(discard, discard_bitmap_bytes), 617 BTRFS_ATTR_PTR(discard, discard_bytes_saved), 618 BTRFS_ATTR_PTR(discard, discard_extent_bytes), 619 BTRFS_ATTR_PTR(discard, iops_limit), 620 BTRFS_ATTR_PTR(discard, kbps_limit), 621 BTRFS_ATTR_PTR(discard, max_discard_size), 622 NULL, 623 }; 624 625 #ifdef CONFIG_BTRFS_DEBUG 626 627 /* 628 * Per-filesystem runtime debugging exported via sysfs. 629 * 630 * Path: /sys/fs/btrfs/UUID/debug/ 631 */ 632 static const struct attribute *btrfs_debug_mount_attrs[] = { 633 NULL, 634 }; 635 636 /* 637 * Runtime debugging exported via sysfs, applies to all mounted filesystems. 638 * 639 * Path: /sys/fs/btrfs/debug 640 */ 641 static struct attribute *btrfs_debug_feature_attrs[] = { 642 NULL 643 }; 644 645 static const struct attribute_group btrfs_debug_feature_attr_group = { 646 .name = "debug", 647 .attrs = btrfs_debug_feature_attrs, 648 }; 649 650 #endif 651 652 static ssize_t btrfs_show_u64(u64 *value_ptr, spinlock_t *lock, char *buf) 653 { 654 u64 val; 655 if (lock) 656 spin_lock(lock); 657 val = *value_ptr; 658 if (lock) 659 spin_unlock(lock); 660 return sysfs_emit(buf, "%llu\n", val); 661 } 662 663 static ssize_t global_rsv_size_show(struct kobject *kobj, 664 struct kobj_attribute *ka, char *buf) 665 { 666 struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); 667 struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 668 return btrfs_show_u64(&block_rsv->size, &block_rsv->lock, buf); 669 } 670 BTRFS_ATTR(allocation, global_rsv_size, global_rsv_size_show); 671 672 static ssize_t global_rsv_reserved_show(struct kobject *kobj, 673 struct kobj_attribute *a, char *buf) 674 { 675 struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); 676 struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 677 return btrfs_show_u64(&block_rsv->reserved, &block_rsv->lock, buf); 678 } 679 BTRFS_ATTR(allocation, global_rsv_reserved, global_rsv_reserved_show); 680 681 #define to_space_info(_kobj) container_of(_kobj, struct btrfs_space_info, kobj) 682 #define to_raid_kobj(_kobj) container_of(_kobj, struct raid_kobject, kobj) 683 684 static ssize_t raid_bytes_show(struct kobject *kobj, 685 struct kobj_attribute *attr, char *buf); 686 BTRFS_ATTR(raid, total_bytes, raid_bytes_show); 687 BTRFS_ATTR(raid, used_bytes, raid_bytes_show); 688 689 static ssize_t raid_bytes_show(struct kobject *kobj, 690 struct kobj_attribute *attr, char *buf) 691 692 { 693 struct btrfs_space_info *sinfo = to_space_info(kobj->parent); 694 struct btrfs_block_group *block_group; 695 int index = btrfs_bg_flags_to_raid_index(to_raid_kobj(kobj)->flags); 696 u64 val = 0; 697 698 down_read(&sinfo->groups_sem); 699 list_for_each_entry(block_group, &sinfo->block_groups[index], list) { 700 if (&attr->attr == BTRFS_ATTR_PTR(raid, total_bytes)) 701 val += block_group->length; 702 else 703 val += block_group->used; 704 } 705 up_read(&sinfo->groups_sem); 706 return sysfs_emit(buf, "%llu\n", val); 707 } 708 709 /* 710 * Allocation information about block group profiles. 711 * 712 * Path: /sys/fs/btrfs/<uuid>/allocation/<bg-type>/<bg-profile>/ 713 */ 714 static struct attribute *raid_attrs[] = { 715 BTRFS_ATTR_PTR(raid, total_bytes), 716 BTRFS_ATTR_PTR(raid, used_bytes), 717 NULL 718 }; 719 ATTRIBUTE_GROUPS(raid); 720 721 static void release_raid_kobj(struct kobject *kobj) 722 { 723 kfree(to_raid_kobj(kobj)); 724 } 725 726 static const struct kobj_type btrfs_raid_ktype = { 727 .sysfs_ops = &kobj_sysfs_ops, 728 .release = release_raid_kobj, 729 .default_groups = raid_groups, 730 }; 731 732 #define SPACE_INFO_ATTR(field) \ 733 static ssize_t btrfs_space_info_show_##field(struct kobject *kobj, \ 734 struct kobj_attribute *a, \ 735 char *buf) \ 736 { \ 737 struct btrfs_space_info *sinfo = to_space_info(kobj); \ 738 return btrfs_show_u64(&sinfo->field, &sinfo->lock, buf); \ 739 } \ 740 BTRFS_ATTR(space_info, field, btrfs_space_info_show_##field) 741 742 static ssize_t btrfs_chunk_size_show(struct kobject *kobj, 743 struct kobj_attribute *a, char *buf) 744 { 745 struct btrfs_space_info *sinfo = to_space_info(kobj); 746 747 return sysfs_emit(buf, "%llu\n", READ_ONCE(sinfo->chunk_size)); 748 } 749 750 /* 751 * Store new chunk size in space info. Can be called on a read-only filesystem. 752 * 753 * If the new chunk size value is larger than 10% of free space it is reduced 754 * to match that limit. Alignment must be to 256M and the system chunk size 755 * cannot be set. 756 */ 757 static ssize_t btrfs_chunk_size_store(struct kobject *kobj, 758 struct kobj_attribute *a, 759 const char *buf, size_t len) 760 { 761 struct btrfs_space_info *space_info = to_space_info(kobj); 762 struct btrfs_fs_info *fs_info = to_fs_info(get_btrfs_kobj(kobj)); 763 char *retptr; 764 u64 val; 765 766 if (!capable(CAP_SYS_ADMIN)) 767 return -EPERM; 768 769 if (!fs_info->fs_devices) 770 return -EINVAL; 771 772 if (btrfs_is_zoned(fs_info)) 773 return -EINVAL; 774 775 /* System block type must not be changed. */ 776 if (space_info->flags & BTRFS_BLOCK_GROUP_SYSTEM) 777 return -EPERM; 778 779 val = memparse(buf, &retptr); 780 /* There could be trailing '\n', also catch any typos after the value */ 781 retptr = skip_spaces(retptr); 782 if (*retptr != 0 || val == 0) 783 return -EINVAL; 784 785 val = min(val, BTRFS_MAX_DATA_CHUNK_SIZE); 786 787 /* Limit stripe size to 10% of available space. */ 788 val = min(mult_perc(fs_info->fs_devices->total_rw_bytes, 10), val); 789 790 /* Must be multiple of 256M. */ 791 val &= ~((u64)SZ_256M - 1); 792 793 /* Must be at least 256M. */ 794 if (val < SZ_256M) 795 return -EINVAL; 796 797 btrfs_update_space_info_chunk_size(space_info, val); 798 799 return len; 800 } 801 802 static ssize_t btrfs_size_classes_show(struct kobject *kobj, 803 struct kobj_attribute *a, char *buf) 804 { 805 struct btrfs_space_info *sinfo = to_space_info(kobj); 806 struct btrfs_block_group *bg; 807 u32 none = 0; 808 u32 small = 0; 809 u32 medium = 0; 810 u32 large = 0; 811 812 for (int i = 0; i < BTRFS_NR_RAID_TYPES; ++i) { 813 down_read(&sinfo->groups_sem); 814 list_for_each_entry(bg, &sinfo->block_groups[i], list) { 815 if (!btrfs_block_group_should_use_size_class(bg)) 816 continue; 817 switch (bg->size_class) { 818 case BTRFS_BG_SZ_NONE: 819 none++; 820 break; 821 case BTRFS_BG_SZ_SMALL: 822 small++; 823 break; 824 case BTRFS_BG_SZ_MEDIUM: 825 medium++; 826 break; 827 case BTRFS_BG_SZ_LARGE: 828 large++; 829 break; 830 } 831 } 832 up_read(&sinfo->groups_sem); 833 } 834 return sysfs_emit(buf, "none %u\n" 835 "small %u\n" 836 "medium %u\n" 837 "large %u\n", 838 none, small, medium, large); 839 } 840 841 #ifdef CONFIG_BTRFS_DEBUG 842 /* 843 * Request chunk allocation with current chunk size. 844 */ 845 static ssize_t btrfs_force_chunk_alloc_store(struct kobject *kobj, 846 struct kobj_attribute *a, 847 const char *buf, size_t len) 848 { 849 struct btrfs_space_info *space_info = to_space_info(kobj); 850 struct btrfs_fs_info *fs_info = to_fs_info(get_btrfs_kobj(kobj)); 851 struct btrfs_trans_handle *trans; 852 bool val; 853 int ret; 854 855 if (!capable(CAP_SYS_ADMIN)) 856 return -EPERM; 857 858 if (sb_rdonly(fs_info->sb)) 859 return -EROFS; 860 861 ret = kstrtobool(buf, &val); 862 if (ret) 863 return ret; 864 865 if (!val) 866 return -EINVAL; 867 868 /* 869 * This is unsafe to be called from sysfs context and may cause 870 * unexpected problems. 871 */ 872 trans = btrfs_start_transaction(fs_info->tree_root, 0); 873 if (IS_ERR(trans)) 874 return PTR_ERR(trans); 875 ret = btrfs_force_chunk_alloc(trans, space_info->flags); 876 btrfs_end_transaction(trans); 877 878 if (ret == 1) 879 return len; 880 881 return -ENOSPC; 882 } 883 BTRFS_ATTR_W(space_info, force_chunk_alloc, btrfs_force_chunk_alloc_store); 884 885 #endif 886 887 SPACE_INFO_ATTR(flags); 888 SPACE_INFO_ATTR(total_bytes); 889 SPACE_INFO_ATTR(bytes_used); 890 SPACE_INFO_ATTR(bytes_pinned); 891 SPACE_INFO_ATTR(bytes_reserved); 892 SPACE_INFO_ATTR(bytes_may_use); 893 SPACE_INFO_ATTR(bytes_readonly); 894 SPACE_INFO_ATTR(bytes_zone_unusable); 895 SPACE_INFO_ATTR(disk_used); 896 SPACE_INFO_ATTR(disk_total); 897 BTRFS_ATTR_RW(space_info, chunk_size, btrfs_chunk_size_show, btrfs_chunk_size_store); 898 BTRFS_ATTR(space_info, size_classes, btrfs_size_classes_show); 899 900 static ssize_t btrfs_sinfo_bg_reclaim_threshold_show(struct kobject *kobj, 901 struct kobj_attribute *a, 902 char *buf) 903 { 904 struct btrfs_space_info *space_info = to_space_info(kobj); 905 906 return sysfs_emit(buf, "%d\n", READ_ONCE(space_info->bg_reclaim_threshold)); 907 } 908 909 static ssize_t btrfs_sinfo_bg_reclaim_threshold_store(struct kobject *kobj, 910 struct kobj_attribute *a, 911 const char *buf, size_t len) 912 { 913 struct btrfs_space_info *space_info = to_space_info(kobj); 914 int thresh; 915 int ret; 916 917 ret = kstrtoint(buf, 10, &thresh); 918 if (ret) 919 return ret; 920 921 if (thresh < 0 || thresh > 100) 922 return -EINVAL; 923 924 WRITE_ONCE(space_info->bg_reclaim_threshold, thresh); 925 926 return len; 927 } 928 929 BTRFS_ATTR_RW(space_info, bg_reclaim_threshold, 930 btrfs_sinfo_bg_reclaim_threshold_show, 931 btrfs_sinfo_bg_reclaim_threshold_store); 932 933 /* 934 * Allocation information about block group types. 935 * 936 * Path: /sys/fs/btrfs/<uuid>/allocation/<bg-type>/ 937 */ 938 static struct attribute *space_info_attrs[] = { 939 BTRFS_ATTR_PTR(space_info, flags), 940 BTRFS_ATTR_PTR(space_info, total_bytes), 941 BTRFS_ATTR_PTR(space_info, bytes_used), 942 BTRFS_ATTR_PTR(space_info, bytes_pinned), 943 BTRFS_ATTR_PTR(space_info, bytes_reserved), 944 BTRFS_ATTR_PTR(space_info, bytes_may_use), 945 BTRFS_ATTR_PTR(space_info, bytes_readonly), 946 BTRFS_ATTR_PTR(space_info, bytes_zone_unusable), 947 BTRFS_ATTR_PTR(space_info, disk_used), 948 BTRFS_ATTR_PTR(space_info, disk_total), 949 BTRFS_ATTR_PTR(space_info, bg_reclaim_threshold), 950 BTRFS_ATTR_PTR(space_info, chunk_size), 951 BTRFS_ATTR_PTR(space_info, size_classes), 952 #ifdef CONFIG_BTRFS_DEBUG 953 BTRFS_ATTR_PTR(space_info, force_chunk_alloc), 954 #endif 955 NULL, 956 }; 957 ATTRIBUTE_GROUPS(space_info); 958 959 static void space_info_release(struct kobject *kobj) 960 { 961 struct btrfs_space_info *sinfo = to_space_info(kobj); 962 kfree(sinfo); 963 } 964 965 static const struct kobj_type space_info_ktype = { 966 .sysfs_ops = &kobj_sysfs_ops, 967 .release = space_info_release, 968 .default_groups = space_info_groups, 969 }; 970 971 /* 972 * Allocation information about block groups. 973 * 974 * Path: /sys/fs/btrfs/<uuid>/allocation/ 975 */ 976 static const struct attribute *allocation_attrs[] = { 977 BTRFS_ATTR_PTR(allocation, global_rsv_reserved), 978 BTRFS_ATTR_PTR(allocation, global_rsv_size), 979 NULL, 980 }; 981 982 static ssize_t btrfs_label_show(struct kobject *kobj, 983 struct kobj_attribute *a, char *buf) 984 { 985 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 986 char *label = fs_info->super_copy->label; 987 ssize_t ret; 988 989 spin_lock(&fs_info->super_lock); 990 ret = sysfs_emit(buf, label[0] ? "%s\n" : "%s", label); 991 spin_unlock(&fs_info->super_lock); 992 993 return ret; 994 } 995 996 static ssize_t btrfs_label_store(struct kobject *kobj, 997 struct kobj_attribute *a, 998 const char *buf, size_t len) 999 { 1000 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 1001 size_t p_len; 1002 1003 if (!fs_info) 1004 return -EPERM; 1005 1006 if (sb_rdonly(fs_info->sb)) 1007 return -EROFS; 1008 1009 /* 1010 * p_len is the len until the first occurrence of either 1011 * '\n' or '\0' 1012 */ 1013 p_len = strcspn(buf, "\n"); 1014 1015 if (p_len >= BTRFS_LABEL_SIZE) 1016 return -EINVAL; 1017 1018 spin_lock(&fs_info->super_lock); 1019 memset(fs_info->super_copy->label, 0, BTRFS_LABEL_SIZE); 1020 memcpy(fs_info->super_copy->label, buf, p_len); 1021 spin_unlock(&fs_info->super_lock); 1022 1023 /* 1024 * We don't want to do full transaction commit from inside sysfs 1025 */ 1026 set_bit(BTRFS_FS_NEED_TRANS_COMMIT, &fs_info->flags); 1027 wake_up_process(fs_info->transaction_kthread); 1028 1029 return len; 1030 } 1031 BTRFS_ATTR_RW(, label, btrfs_label_show, btrfs_label_store); 1032 1033 static ssize_t btrfs_nodesize_show(struct kobject *kobj, 1034 struct kobj_attribute *a, char *buf) 1035 { 1036 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 1037 1038 return sysfs_emit(buf, "%u\n", fs_info->super_copy->nodesize); 1039 } 1040 1041 BTRFS_ATTR(, nodesize, btrfs_nodesize_show); 1042 1043 static ssize_t btrfs_sectorsize_show(struct kobject *kobj, 1044 struct kobj_attribute *a, char *buf) 1045 { 1046 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 1047 1048 return sysfs_emit(buf, "%u\n", fs_info->super_copy->sectorsize); 1049 } 1050 1051 BTRFS_ATTR(, sectorsize, btrfs_sectorsize_show); 1052 1053 static ssize_t btrfs_commit_stats_show(struct kobject *kobj, 1054 struct kobj_attribute *a, char *buf) 1055 { 1056 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 1057 1058 return sysfs_emit(buf, 1059 "commits %llu\n" 1060 "last_commit_ms %llu\n" 1061 "max_commit_ms %llu\n" 1062 "total_commit_ms %llu\n", 1063 fs_info->commit_stats.commit_count, 1064 div_u64(fs_info->commit_stats.last_commit_dur, NSEC_PER_MSEC), 1065 div_u64(fs_info->commit_stats.max_commit_dur, NSEC_PER_MSEC), 1066 div_u64(fs_info->commit_stats.total_commit_dur, NSEC_PER_MSEC)); 1067 } 1068 1069 static ssize_t btrfs_commit_stats_store(struct kobject *kobj, 1070 struct kobj_attribute *a, 1071 const char *buf, size_t len) 1072 { 1073 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 1074 unsigned long val; 1075 int ret; 1076 1077 if (!fs_info) 1078 return -EPERM; 1079 1080 if (!capable(CAP_SYS_RESOURCE)) 1081 return -EPERM; 1082 1083 ret = kstrtoul(buf, 10, &val); 1084 if (ret) 1085 return ret; 1086 if (val) 1087 return -EINVAL; 1088 1089 WRITE_ONCE(fs_info->commit_stats.max_commit_dur, 0); 1090 1091 return len; 1092 } 1093 BTRFS_ATTR_RW(, commit_stats, btrfs_commit_stats_show, btrfs_commit_stats_store); 1094 1095 static ssize_t btrfs_clone_alignment_show(struct kobject *kobj, 1096 struct kobj_attribute *a, char *buf) 1097 { 1098 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 1099 1100 return sysfs_emit(buf, "%u\n", fs_info->super_copy->sectorsize); 1101 } 1102 1103 BTRFS_ATTR(, clone_alignment, btrfs_clone_alignment_show); 1104 1105 static ssize_t quota_override_show(struct kobject *kobj, 1106 struct kobj_attribute *a, char *buf) 1107 { 1108 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 1109 int quota_override; 1110 1111 quota_override = test_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags); 1112 return sysfs_emit(buf, "%d\n", quota_override); 1113 } 1114 1115 static ssize_t quota_override_store(struct kobject *kobj, 1116 struct kobj_attribute *a, 1117 const char *buf, size_t len) 1118 { 1119 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 1120 unsigned long knob; 1121 int err; 1122 1123 if (!fs_info) 1124 return -EPERM; 1125 1126 if (!capable(CAP_SYS_RESOURCE)) 1127 return -EPERM; 1128 1129 err = kstrtoul(buf, 10, &knob); 1130 if (err) 1131 return err; 1132 if (knob > 1) 1133 return -EINVAL; 1134 1135 if (knob) 1136 set_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags); 1137 else 1138 clear_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags); 1139 1140 return len; 1141 } 1142 1143 BTRFS_ATTR_RW(, quota_override, quota_override_show, quota_override_store); 1144 1145 static ssize_t btrfs_metadata_uuid_show(struct kobject *kobj, 1146 struct kobj_attribute *a, char *buf) 1147 { 1148 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 1149 1150 return sysfs_emit(buf, "%pU\n", fs_info->fs_devices->metadata_uuid); 1151 } 1152 1153 BTRFS_ATTR(, metadata_uuid, btrfs_metadata_uuid_show); 1154 1155 static ssize_t btrfs_checksum_show(struct kobject *kobj, 1156 struct kobj_attribute *a, char *buf) 1157 { 1158 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 1159 u16 csum_type = btrfs_super_csum_type(fs_info->super_copy); 1160 1161 return sysfs_emit(buf, "%s (%s)\n", 1162 btrfs_super_csum_name(csum_type), 1163 crypto_shash_driver_name(fs_info->csum_shash)); 1164 } 1165 1166 BTRFS_ATTR(, checksum, btrfs_checksum_show); 1167 1168 static ssize_t btrfs_exclusive_operation_show(struct kobject *kobj, 1169 struct kobj_attribute *a, char *buf) 1170 { 1171 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 1172 const char *str; 1173 1174 switch (READ_ONCE(fs_info->exclusive_operation)) { 1175 case BTRFS_EXCLOP_NONE: 1176 str = "none\n"; 1177 break; 1178 case BTRFS_EXCLOP_BALANCE: 1179 str = "balance\n"; 1180 break; 1181 case BTRFS_EXCLOP_BALANCE_PAUSED: 1182 str = "balance paused\n"; 1183 break; 1184 case BTRFS_EXCLOP_DEV_ADD: 1185 str = "device add\n"; 1186 break; 1187 case BTRFS_EXCLOP_DEV_REMOVE: 1188 str = "device remove\n"; 1189 break; 1190 case BTRFS_EXCLOP_DEV_REPLACE: 1191 str = "device replace\n"; 1192 break; 1193 case BTRFS_EXCLOP_RESIZE: 1194 str = "resize\n"; 1195 break; 1196 case BTRFS_EXCLOP_SWAP_ACTIVATE: 1197 str = "swap activate\n"; 1198 break; 1199 default: 1200 str = "UNKNOWN\n"; 1201 break; 1202 } 1203 return sysfs_emit(buf, "%s", str); 1204 } 1205 BTRFS_ATTR(, exclusive_operation, btrfs_exclusive_operation_show); 1206 1207 static ssize_t btrfs_generation_show(struct kobject *kobj, 1208 struct kobj_attribute *a, char *buf) 1209 { 1210 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 1211 1212 return sysfs_emit(buf, "%llu\n", btrfs_get_fs_generation(fs_info)); 1213 } 1214 BTRFS_ATTR(, generation, btrfs_generation_show); 1215 1216 static ssize_t btrfs_temp_fsid_show(struct kobject *kobj, 1217 struct kobj_attribute *a, char *buf) 1218 { 1219 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 1220 1221 return sysfs_emit(buf, "%d\n", fs_info->fs_devices->temp_fsid); 1222 } 1223 BTRFS_ATTR(, temp_fsid, btrfs_temp_fsid_show); 1224 1225 static const char * const btrfs_read_policy_name[] = { "pid" }; 1226 1227 static ssize_t btrfs_read_policy_show(struct kobject *kobj, 1228 struct kobj_attribute *a, char *buf) 1229 { 1230 struct btrfs_fs_devices *fs_devices = to_fs_devs(kobj); 1231 ssize_t ret = 0; 1232 int i; 1233 1234 for (i = 0; i < BTRFS_NR_READ_POLICY; i++) { 1235 if (fs_devices->read_policy == i) 1236 ret += sysfs_emit_at(buf, ret, "%s[%s]", 1237 (ret == 0 ? "" : " "), 1238 btrfs_read_policy_name[i]); 1239 else 1240 ret += sysfs_emit_at(buf, ret, "%s%s", 1241 (ret == 0 ? "" : " "), 1242 btrfs_read_policy_name[i]); 1243 } 1244 1245 ret += sysfs_emit_at(buf, ret, "\n"); 1246 1247 return ret; 1248 } 1249 1250 static ssize_t btrfs_read_policy_store(struct kobject *kobj, 1251 struct kobj_attribute *a, 1252 const char *buf, size_t len) 1253 { 1254 struct btrfs_fs_devices *fs_devices = to_fs_devs(kobj); 1255 int i; 1256 1257 for (i = 0; i < BTRFS_NR_READ_POLICY; i++) { 1258 if (sysfs_streq(buf, btrfs_read_policy_name[i])) { 1259 if (i != fs_devices->read_policy) { 1260 fs_devices->read_policy = i; 1261 btrfs_info(fs_devices->fs_info, 1262 "read policy set to '%s'", 1263 btrfs_read_policy_name[i]); 1264 } 1265 return len; 1266 } 1267 } 1268 1269 return -EINVAL; 1270 } 1271 BTRFS_ATTR_RW(, read_policy, btrfs_read_policy_show, btrfs_read_policy_store); 1272 1273 static ssize_t btrfs_bg_reclaim_threshold_show(struct kobject *kobj, 1274 struct kobj_attribute *a, 1275 char *buf) 1276 { 1277 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 1278 1279 return sysfs_emit(buf, "%d\n", READ_ONCE(fs_info->bg_reclaim_threshold)); 1280 } 1281 1282 static ssize_t btrfs_bg_reclaim_threshold_store(struct kobject *kobj, 1283 struct kobj_attribute *a, 1284 const char *buf, size_t len) 1285 { 1286 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 1287 int thresh; 1288 int ret; 1289 1290 ret = kstrtoint(buf, 10, &thresh); 1291 if (ret) 1292 return ret; 1293 1294 #ifdef CONFIG_BTRFS_DEBUG 1295 if (thresh != 0 && (thresh > 100)) 1296 return -EINVAL; 1297 #else 1298 if (thresh != 0 && (thresh <= 50 || thresh > 100)) 1299 return -EINVAL; 1300 #endif 1301 1302 WRITE_ONCE(fs_info->bg_reclaim_threshold, thresh); 1303 1304 return len; 1305 } 1306 BTRFS_ATTR_RW(, bg_reclaim_threshold, btrfs_bg_reclaim_threshold_show, 1307 btrfs_bg_reclaim_threshold_store); 1308 1309 /* 1310 * Per-filesystem information and stats. 1311 * 1312 * Path: /sys/fs/btrfs/<uuid>/ 1313 */ 1314 static const struct attribute *btrfs_attrs[] = { 1315 BTRFS_ATTR_PTR(, label), 1316 BTRFS_ATTR_PTR(, nodesize), 1317 BTRFS_ATTR_PTR(, sectorsize), 1318 BTRFS_ATTR_PTR(, clone_alignment), 1319 BTRFS_ATTR_PTR(, quota_override), 1320 BTRFS_ATTR_PTR(, metadata_uuid), 1321 BTRFS_ATTR_PTR(, checksum), 1322 BTRFS_ATTR_PTR(, exclusive_operation), 1323 BTRFS_ATTR_PTR(, generation), 1324 BTRFS_ATTR_PTR(, read_policy), 1325 BTRFS_ATTR_PTR(, bg_reclaim_threshold), 1326 BTRFS_ATTR_PTR(, commit_stats), 1327 BTRFS_ATTR_PTR(, temp_fsid), 1328 NULL, 1329 }; 1330 1331 static void btrfs_release_fsid_kobj(struct kobject *kobj) 1332 { 1333 struct btrfs_fs_devices *fs_devs = to_fs_devs(kobj); 1334 1335 memset(&fs_devs->fsid_kobj, 0, sizeof(struct kobject)); 1336 complete(&fs_devs->kobj_unregister); 1337 } 1338 1339 static const struct kobj_type btrfs_ktype = { 1340 .sysfs_ops = &kobj_sysfs_ops, 1341 .release = btrfs_release_fsid_kobj, 1342 }; 1343 1344 static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj) 1345 { 1346 if (kobj->ktype != &btrfs_ktype) 1347 return NULL; 1348 return container_of(kobj, struct btrfs_fs_devices, fsid_kobj); 1349 } 1350 1351 static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj) 1352 { 1353 if (kobj->ktype != &btrfs_ktype) 1354 return NULL; 1355 return to_fs_devs(kobj)->fs_info; 1356 } 1357 1358 static struct kobject *get_btrfs_kobj(struct kobject *kobj) 1359 { 1360 while (kobj) { 1361 if (kobj->ktype == &btrfs_ktype) 1362 return kobj; 1363 kobj = kobj->parent; 1364 } 1365 return NULL; 1366 } 1367 1368 #define NUM_FEATURE_BITS 64 1369 #define BTRFS_FEATURE_NAME_MAX 13 1370 static char btrfs_unknown_feature_names[FEAT_MAX][NUM_FEATURE_BITS][BTRFS_FEATURE_NAME_MAX]; 1371 static struct btrfs_feature_attr btrfs_feature_attrs[FEAT_MAX][NUM_FEATURE_BITS]; 1372 1373 static_assert(ARRAY_SIZE(btrfs_unknown_feature_names) == 1374 ARRAY_SIZE(btrfs_feature_attrs)); 1375 static_assert(ARRAY_SIZE(btrfs_unknown_feature_names[0]) == 1376 ARRAY_SIZE(btrfs_feature_attrs[0])); 1377 1378 static const u64 supported_feature_masks[FEAT_MAX] = { 1379 [FEAT_COMPAT] = BTRFS_FEATURE_COMPAT_SUPP, 1380 [FEAT_COMPAT_RO] = BTRFS_FEATURE_COMPAT_RO_SUPP, 1381 [FEAT_INCOMPAT] = BTRFS_FEATURE_INCOMPAT_SUPP, 1382 }; 1383 1384 static int addrm_unknown_feature_attrs(struct btrfs_fs_info *fs_info, bool add) 1385 { 1386 int set; 1387 1388 for (set = 0; set < FEAT_MAX; set++) { 1389 int i; 1390 struct attribute *attrs[2]; 1391 struct attribute_group agroup = { 1392 .name = "features", 1393 .attrs = attrs, 1394 }; 1395 u64 features = get_features(fs_info, set); 1396 features &= ~supported_feature_masks[set]; 1397 1398 if (!features) 1399 continue; 1400 1401 attrs[1] = NULL; 1402 for (i = 0; i < NUM_FEATURE_BITS; i++) { 1403 struct btrfs_feature_attr *fa; 1404 1405 if (!(features & (1ULL << i))) 1406 continue; 1407 1408 fa = &btrfs_feature_attrs[set][i]; 1409 attrs[0] = &fa->kobj_attr.attr; 1410 if (add) { 1411 int ret; 1412 ret = sysfs_merge_group(&fs_info->fs_devices->fsid_kobj, 1413 &agroup); 1414 if (ret) 1415 return ret; 1416 } else 1417 sysfs_unmerge_group(&fs_info->fs_devices->fsid_kobj, 1418 &agroup); 1419 } 1420 1421 } 1422 return 0; 1423 } 1424 1425 static void __btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs) 1426 { 1427 if (fs_devs->devinfo_kobj) { 1428 kobject_del(fs_devs->devinfo_kobj); 1429 kobject_put(fs_devs->devinfo_kobj); 1430 fs_devs->devinfo_kobj = NULL; 1431 } 1432 1433 if (fs_devs->devices_kobj) { 1434 kobject_del(fs_devs->devices_kobj); 1435 kobject_put(fs_devs->devices_kobj); 1436 fs_devs->devices_kobj = NULL; 1437 } 1438 1439 if (fs_devs->fsid_kobj.state_initialized) { 1440 kobject_del(&fs_devs->fsid_kobj); 1441 kobject_put(&fs_devs->fsid_kobj); 1442 wait_for_completion(&fs_devs->kobj_unregister); 1443 } 1444 } 1445 1446 /* when fs_devs is NULL it will remove all fsid kobject */ 1447 void btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs) 1448 { 1449 struct list_head *fs_uuids = btrfs_get_fs_uuids(); 1450 1451 if (fs_devs) { 1452 __btrfs_sysfs_remove_fsid(fs_devs); 1453 return; 1454 } 1455 1456 list_for_each_entry(fs_devs, fs_uuids, fs_list) { 1457 __btrfs_sysfs_remove_fsid(fs_devs); 1458 } 1459 } 1460 1461 static void btrfs_sysfs_remove_fs_devices(struct btrfs_fs_devices *fs_devices) 1462 { 1463 struct btrfs_device *device; 1464 struct btrfs_fs_devices *seed; 1465 1466 list_for_each_entry(device, &fs_devices->devices, dev_list) 1467 btrfs_sysfs_remove_device(device); 1468 1469 list_for_each_entry(seed, &fs_devices->seed_list, seed_list) { 1470 list_for_each_entry(device, &seed->devices, dev_list) 1471 btrfs_sysfs_remove_device(device); 1472 } 1473 } 1474 1475 void btrfs_sysfs_remove_mounted(struct btrfs_fs_info *fs_info) 1476 { 1477 struct kobject *fsid_kobj = &fs_info->fs_devices->fsid_kobj; 1478 1479 sysfs_remove_link(fsid_kobj, "bdi"); 1480 1481 if (fs_info->space_info_kobj) { 1482 sysfs_remove_files(fs_info->space_info_kobj, allocation_attrs); 1483 kobject_del(fs_info->space_info_kobj); 1484 kobject_put(fs_info->space_info_kobj); 1485 } 1486 if (fs_info->discard_kobj) { 1487 sysfs_remove_files(fs_info->discard_kobj, discard_attrs); 1488 kobject_del(fs_info->discard_kobj); 1489 kobject_put(fs_info->discard_kobj); 1490 } 1491 #ifdef CONFIG_BTRFS_DEBUG 1492 if (fs_info->debug_kobj) { 1493 sysfs_remove_files(fs_info->debug_kobj, btrfs_debug_mount_attrs); 1494 kobject_del(fs_info->debug_kobj); 1495 kobject_put(fs_info->debug_kobj); 1496 } 1497 #endif 1498 addrm_unknown_feature_attrs(fs_info, false); 1499 sysfs_remove_group(fsid_kobj, &btrfs_feature_attr_group); 1500 sysfs_remove_files(fsid_kobj, btrfs_attrs); 1501 btrfs_sysfs_remove_fs_devices(fs_info->fs_devices); 1502 } 1503 1504 static const char * const btrfs_feature_set_names[FEAT_MAX] = { 1505 [FEAT_COMPAT] = "compat", 1506 [FEAT_COMPAT_RO] = "compat_ro", 1507 [FEAT_INCOMPAT] = "incompat", 1508 }; 1509 1510 const char *btrfs_feature_set_name(enum btrfs_feature_set set) 1511 { 1512 return btrfs_feature_set_names[set]; 1513 } 1514 1515 char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags) 1516 { 1517 size_t bufsize = 4096; /* safe max, 64 names * 64 bytes */ 1518 int len = 0; 1519 int i; 1520 char *str; 1521 1522 str = kmalloc(bufsize, GFP_KERNEL); 1523 if (!str) 1524 return str; 1525 1526 for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { 1527 const char *name; 1528 1529 if (!(flags & (1ULL << i))) 1530 continue; 1531 1532 name = btrfs_feature_attrs[set][i].kobj_attr.attr.name; 1533 len += scnprintf(str + len, bufsize - len, "%s%s", 1534 len ? "," : "", name); 1535 } 1536 1537 return str; 1538 } 1539 1540 static void init_feature_attrs(void) 1541 { 1542 struct btrfs_feature_attr *fa; 1543 int set, i; 1544 1545 memset(btrfs_feature_attrs, 0, sizeof(btrfs_feature_attrs)); 1546 memset(btrfs_unknown_feature_names, 0, 1547 sizeof(btrfs_unknown_feature_names)); 1548 1549 for (i = 0; btrfs_supported_feature_attrs[i]; i++) { 1550 struct btrfs_feature_attr *sfa; 1551 struct attribute *a = btrfs_supported_feature_attrs[i]; 1552 int bit; 1553 sfa = attr_to_btrfs_feature_attr(a); 1554 bit = ilog2(sfa->feature_bit); 1555 fa = &btrfs_feature_attrs[sfa->feature_set][bit]; 1556 1557 fa->kobj_attr.attr.name = sfa->kobj_attr.attr.name; 1558 } 1559 1560 for (set = 0; set < FEAT_MAX; set++) { 1561 for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { 1562 char *name = btrfs_unknown_feature_names[set][i]; 1563 fa = &btrfs_feature_attrs[set][i]; 1564 1565 if (fa->kobj_attr.attr.name) 1566 continue; 1567 1568 snprintf(name, BTRFS_FEATURE_NAME_MAX, "%s:%u", 1569 btrfs_feature_set_names[set], i); 1570 1571 fa->kobj_attr.attr.name = name; 1572 fa->kobj_attr.attr.mode = S_IRUGO; 1573 fa->feature_set = set; 1574 fa->feature_bit = 1ULL << i; 1575 } 1576 } 1577 } 1578 1579 /* 1580 * Create a sysfs entry for a given block group type at path 1581 * /sys/fs/btrfs/UUID/allocation/data/TYPE 1582 */ 1583 void btrfs_sysfs_add_block_group_type(struct btrfs_block_group *cache) 1584 { 1585 struct btrfs_fs_info *fs_info = cache->fs_info; 1586 struct btrfs_space_info *space_info = cache->space_info; 1587 struct raid_kobject *rkobj; 1588 const int index = btrfs_bg_flags_to_raid_index(cache->flags); 1589 unsigned int nofs_flag; 1590 int ret; 1591 1592 /* 1593 * Setup a NOFS context because kobject_add(), deep in its call chain, 1594 * does GFP_KERNEL allocations, and we are often called in a context 1595 * where if reclaim is triggered we can deadlock (we are either holding 1596 * a transaction handle or some lock required for a transaction 1597 * commit). 1598 */ 1599 nofs_flag = memalloc_nofs_save(); 1600 1601 rkobj = kzalloc(sizeof(*rkobj), GFP_NOFS); 1602 if (!rkobj) { 1603 memalloc_nofs_restore(nofs_flag); 1604 btrfs_warn(cache->fs_info, 1605 "couldn't alloc memory for raid level kobject"); 1606 return; 1607 } 1608 1609 rkobj->flags = cache->flags; 1610 kobject_init(&rkobj->kobj, &btrfs_raid_ktype); 1611 1612 /* 1613 * We call this either on mount, or if we've created a block group for a 1614 * new index type while running (i.e. when restriping). The running 1615 * case is tricky because we could race with other threads, so we need 1616 * to have this check to make sure we didn't already init the kobject. 1617 * 1618 * We don't have to protect on the free side because it only happens on 1619 * unmount. 1620 */ 1621 spin_lock(&space_info->lock); 1622 if (space_info->block_group_kobjs[index]) { 1623 spin_unlock(&space_info->lock); 1624 kobject_put(&rkobj->kobj); 1625 return; 1626 } else { 1627 space_info->block_group_kobjs[index] = &rkobj->kobj; 1628 } 1629 spin_unlock(&space_info->lock); 1630 1631 ret = kobject_add(&rkobj->kobj, &space_info->kobj, "%s", 1632 btrfs_bg_type_to_raid_name(rkobj->flags)); 1633 memalloc_nofs_restore(nofs_flag); 1634 if (ret) { 1635 spin_lock(&space_info->lock); 1636 space_info->block_group_kobjs[index] = NULL; 1637 spin_unlock(&space_info->lock); 1638 kobject_put(&rkobj->kobj); 1639 btrfs_warn(fs_info, 1640 "failed to add kobject for block cache, ignoring"); 1641 return; 1642 } 1643 } 1644 1645 /* 1646 * Remove sysfs directories for all block group types of a given space info and 1647 * the space info as well 1648 */ 1649 void btrfs_sysfs_remove_space_info(struct btrfs_space_info *space_info) 1650 { 1651 int i; 1652 1653 for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) { 1654 struct kobject *kobj; 1655 1656 kobj = space_info->block_group_kobjs[i]; 1657 space_info->block_group_kobjs[i] = NULL; 1658 if (kobj) { 1659 kobject_del(kobj); 1660 kobject_put(kobj); 1661 } 1662 } 1663 kobject_del(&space_info->kobj); 1664 kobject_put(&space_info->kobj); 1665 } 1666 1667 static const char *alloc_name(u64 flags) 1668 { 1669 switch (flags) { 1670 case BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_DATA: 1671 return "mixed"; 1672 case BTRFS_BLOCK_GROUP_METADATA: 1673 return "metadata"; 1674 case BTRFS_BLOCK_GROUP_DATA: 1675 return "data"; 1676 case BTRFS_BLOCK_GROUP_SYSTEM: 1677 return "system"; 1678 default: 1679 WARN_ON(1); 1680 return "invalid-combination"; 1681 } 1682 } 1683 1684 /* 1685 * Create a sysfs entry for a space info type at path 1686 * /sys/fs/btrfs/UUID/allocation/TYPE 1687 */ 1688 int btrfs_sysfs_add_space_info_type(struct btrfs_fs_info *fs_info, 1689 struct btrfs_space_info *space_info) 1690 { 1691 int ret; 1692 1693 ret = kobject_init_and_add(&space_info->kobj, &space_info_ktype, 1694 fs_info->space_info_kobj, "%s", 1695 alloc_name(space_info->flags)); 1696 if (ret) { 1697 kobject_put(&space_info->kobj); 1698 return ret; 1699 } 1700 1701 return 0; 1702 } 1703 1704 void btrfs_sysfs_remove_device(struct btrfs_device *device) 1705 { 1706 struct kobject *devices_kobj; 1707 1708 /* 1709 * Seed fs_devices devices_kobj aren't used, fetch kobject from the 1710 * fs_info::fs_devices. 1711 */ 1712 devices_kobj = device->fs_info->fs_devices->devices_kobj; 1713 ASSERT(devices_kobj); 1714 1715 if (device->bdev) 1716 sysfs_remove_link(devices_kobj, bdev_kobj(device->bdev)->name); 1717 1718 if (device->devid_kobj.state_initialized) { 1719 kobject_del(&device->devid_kobj); 1720 kobject_put(&device->devid_kobj); 1721 wait_for_completion(&device->kobj_unregister); 1722 } 1723 } 1724 1725 static ssize_t btrfs_devinfo_in_fs_metadata_show(struct kobject *kobj, 1726 struct kobj_attribute *a, 1727 char *buf) 1728 { 1729 int val; 1730 struct btrfs_device *device = container_of(kobj, struct btrfs_device, 1731 devid_kobj); 1732 1733 val = !!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &device->dev_state); 1734 1735 return sysfs_emit(buf, "%d\n", val); 1736 } 1737 BTRFS_ATTR(devid, in_fs_metadata, btrfs_devinfo_in_fs_metadata_show); 1738 1739 static ssize_t btrfs_devinfo_missing_show(struct kobject *kobj, 1740 struct kobj_attribute *a, char *buf) 1741 { 1742 int val; 1743 struct btrfs_device *device = container_of(kobj, struct btrfs_device, 1744 devid_kobj); 1745 1746 val = !!test_bit(BTRFS_DEV_STATE_MISSING, &device->dev_state); 1747 1748 return sysfs_emit(buf, "%d\n", val); 1749 } 1750 BTRFS_ATTR(devid, missing, btrfs_devinfo_missing_show); 1751 1752 static ssize_t btrfs_devinfo_replace_target_show(struct kobject *kobj, 1753 struct kobj_attribute *a, 1754 char *buf) 1755 { 1756 int val; 1757 struct btrfs_device *device = container_of(kobj, struct btrfs_device, 1758 devid_kobj); 1759 1760 val = !!test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state); 1761 1762 return sysfs_emit(buf, "%d\n", val); 1763 } 1764 BTRFS_ATTR(devid, replace_target, btrfs_devinfo_replace_target_show); 1765 1766 static ssize_t btrfs_devinfo_scrub_speed_max_show(struct kobject *kobj, 1767 struct kobj_attribute *a, 1768 char *buf) 1769 { 1770 struct btrfs_device *device = container_of(kobj, struct btrfs_device, 1771 devid_kobj); 1772 1773 return sysfs_emit(buf, "%llu\n", READ_ONCE(device->scrub_speed_max)); 1774 } 1775 1776 static ssize_t btrfs_devinfo_scrub_speed_max_store(struct kobject *kobj, 1777 struct kobj_attribute *a, 1778 const char *buf, size_t len) 1779 { 1780 struct btrfs_device *device = container_of(kobj, struct btrfs_device, 1781 devid_kobj); 1782 char *endptr; 1783 unsigned long long limit; 1784 1785 limit = memparse(buf, &endptr); 1786 /* There could be trailing '\n', also catch any typos after the value. */ 1787 endptr = skip_spaces(endptr); 1788 if (*endptr != 0) 1789 return -EINVAL; 1790 WRITE_ONCE(device->scrub_speed_max, limit); 1791 return len; 1792 } 1793 BTRFS_ATTR_RW(devid, scrub_speed_max, btrfs_devinfo_scrub_speed_max_show, 1794 btrfs_devinfo_scrub_speed_max_store); 1795 1796 static ssize_t btrfs_devinfo_writeable_show(struct kobject *kobj, 1797 struct kobj_attribute *a, char *buf) 1798 { 1799 int val; 1800 struct btrfs_device *device = container_of(kobj, struct btrfs_device, 1801 devid_kobj); 1802 1803 val = !!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state); 1804 1805 return sysfs_emit(buf, "%d\n", val); 1806 } 1807 BTRFS_ATTR(devid, writeable, btrfs_devinfo_writeable_show); 1808 1809 static ssize_t btrfs_devinfo_fsid_show(struct kobject *kobj, 1810 struct kobj_attribute *a, char *buf) 1811 { 1812 struct btrfs_device *device = container_of(kobj, struct btrfs_device, 1813 devid_kobj); 1814 1815 return sysfs_emit(buf, "%pU\n", device->fs_devices->fsid); 1816 } 1817 BTRFS_ATTR(devid, fsid, btrfs_devinfo_fsid_show); 1818 1819 static ssize_t btrfs_devinfo_error_stats_show(struct kobject *kobj, 1820 struct kobj_attribute *a, char *buf) 1821 { 1822 struct btrfs_device *device = container_of(kobj, struct btrfs_device, 1823 devid_kobj); 1824 1825 if (!device->dev_stats_valid) 1826 return sysfs_emit(buf, "invalid\n"); 1827 1828 /* 1829 * Print all at once so we get a snapshot of all values from the same 1830 * time. Keep them in sync and in order of definition of 1831 * btrfs_dev_stat_values. 1832 */ 1833 return sysfs_emit(buf, 1834 "write_errs %d\n" 1835 "read_errs %d\n" 1836 "flush_errs %d\n" 1837 "corruption_errs %d\n" 1838 "generation_errs %d\n", 1839 btrfs_dev_stat_read(device, BTRFS_DEV_STAT_WRITE_ERRS), 1840 btrfs_dev_stat_read(device, BTRFS_DEV_STAT_READ_ERRS), 1841 btrfs_dev_stat_read(device, BTRFS_DEV_STAT_FLUSH_ERRS), 1842 btrfs_dev_stat_read(device, BTRFS_DEV_STAT_CORRUPTION_ERRS), 1843 btrfs_dev_stat_read(device, BTRFS_DEV_STAT_GENERATION_ERRS)); 1844 } 1845 BTRFS_ATTR(devid, error_stats, btrfs_devinfo_error_stats_show); 1846 1847 /* 1848 * Information about one device. 1849 * 1850 * Path: /sys/fs/btrfs/<uuid>/devinfo/<devid>/ 1851 */ 1852 static struct attribute *devid_attrs[] = { 1853 BTRFS_ATTR_PTR(devid, error_stats), 1854 BTRFS_ATTR_PTR(devid, fsid), 1855 BTRFS_ATTR_PTR(devid, in_fs_metadata), 1856 BTRFS_ATTR_PTR(devid, missing), 1857 BTRFS_ATTR_PTR(devid, replace_target), 1858 BTRFS_ATTR_PTR(devid, scrub_speed_max), 1859 BTRFS_ATTR_PTR(devid, writeable), 1860 NULL 1861 }; 1862 ATTRIBUTE_GROUPS(devid); 1863 1864 static void btrfs_release_devid_kobj(struct kobject *kobj) 1865 { 1866 struct btrfs_device *device = container_of(kobj, struct btrfs_device, 1867 devid_kobj); 1868 1869 memset(&device->devid_kobj, 0, sizeof(struct kobject)); 1870 complete(&device->kobj_unregister); 1871 } 1872 1873 static const struct kobj_type devid_ktype = { 1874 .sysfs_ops = &kobj_sysfs_ops, 1875 .default_groups = devid_groups, 1876 .release = btrfs_release_devid_kobj, 1877 }; 1878 1879 int btrfs_sysfs_add_device(struct btrfs_device *device) 1880 { 1881 int ret; 1882 unsigned int nofs_flag; 1883 struct kobject *devices_kobj; 1884 struct kobject *devinfo_kobj; 1885 1886 /* 1887 * Make sure we use the fs_info::fs_devices to fetch the kobjects even 1888 * for the seed fs_devices 1889 */ 1890 devices_kobj = device->fs_info->fs_devices->devices_kobj; 1891 devinfo_kobj = device->fs_info->fs_devices->devinfo_kobj; 1892 ASSERT(devices_kobj); 1893 ASSERT(devinfo_kobj); 1894 1895 nofs_flag = memalloc_nofs_save(); 1896 1897 if (device->bdev) { 1898 struct kobject *disk_kobj = bdev_kobj(device->bdev); 1899 1900 ret = sysfs_create_link(devices_kobj, disk_kobj, disk_kobj->name); 1901 if (ret) { 1902 btrfs_warn(device->fs_info, 1903 "creating sysfs device link for devid %llu failed: %d", 1904 device->devid, ret); 1905 goto out; 1906 } 1907 } 1908 1909 init_completion(&device->kobj_unregister); 1910 ret = kobject_init_and_add(&device->devid_kobj, &devid_ktype, 1911 devinfo_kobj, "%llu", device->devid); 1912 if (ret) { 1913 kobject_put(&device->devid_kobj); 1914 btrfs_warn(device->fs_info, 1915 "devinfo init for devid %llu failed: %d", 1916 device->devid, ret); 1917 } 1918 1919 out: 1920 memalloc_nofs_restore(nofs_flag); 1921 return ret; 1922 } 1923 1924 static int btrfs_sysfs_add_fs_devices(struct btrfs_fs_devices *fs_devices) 1925 { 1926 int ret; 1927 struct btrfs_device *device; 1928 struct btrfs_fs_devices *seed; 1929 1930 list_for_each_entry(device, &fs_devices->devices, dev_list) { 1931 ret = btrfs_sysfs_add_device(device); 1932 if (ret) 1933 goto fail; 1934 } 1935 1936 list_for_each_entry(seed, &fs_devices->seed_list, seed_list) { 1937 list_for_each_entry(device, &seed->devices, dev_list) { 1938 ret = btrfs_sysfs_add_device(device); 1939 if (ret) 1940 goto fail; 1941 } 1942 } 1943 1944 return 0; 1945 1946 fail: 1947 btrfs_sysfs_remove_fs_devices(fs_devices); 1948 return ret; 1949 } 1950 1951 void btrfs_kobject_uevent(struct block_device *bdev, enum kobject_action action) 1952 { 1953 int ret; 1954 1955 ret = kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, action); 1956 if (ret) 1957 pr_warn("BTRFS: Sending event '%d' to kobject: '%s' (%p): failed\n", 1958 action, kobject_name(&disk_to_dev(bdev->bd_disk)->kobj), 1959 &disk_to_dev(bdev->bd_disk)->kobj); 1960 } 1961 1962 void btrfs_sysfs_update_sprout_fsid(struct btrfs_fs_devices *fs_devices) 1963 1964 { 1965 char fsid_buf[BTRFS_UUID_UNPARSED_SIZE]; 1966 1967 /* 1968 * Sprouting changes fsid of the mounted filesystem, rename the fsid 1969 * directory 1970 */ 1971 snprintf(fsid_buf, BTRFS_UUID_UNPARSED_SIZE, "%pU", fs_devices->fsid); 1972 if (kobject_rename(&fs_devices->fsid_kobj, fsid_buf)) 1973 btrfs_warn(fs_devices->fs_info, 1974 "sysfs: failed to create fsid for sprout"); 1975 } 1976 1977 void btrfs_sysfs_update_devid(struct btrfs_device *device) 1978 { 1979 char tmp[24]; 1980 1981 snprintf(tmp, sizeof(tmp), "%llu", device->devid); 1982 1983 if (kobject_rename(&device->devid_kobj, tmp)) 1984 btrfs_warn(device->fs_devices->fs_info, 1985 "sysfs: failed to update devid for %llu", 1986 device->devid); 1987 } 1988 1989 /* /sys/fs/btrfs/ entry */ 1990 static struct kset *btrfs_kset; 1991 1992 /* 1993 * Creates: 1994 * /sys/fs/btrfs/UUID 1995 * 1996 * Can be called by the device discovery thread. 1997 */ 1998 int btrfs_sysfs_add_fsid(struct btrfs_fs_devices *fs_devs) 1999 { 2000 int error; 2001 2002 init_completion(&fs_devs->kobj_unregister); 2003 fs_devs->fsid_kobj.kset = btrfs_kset; 2004 error = kobject_init_and_add(&fs_devs->fsid_kobj, &btrfs_ktype, NULL, 2005 "%pU", fs_devs->fsid); 2006 if (error) { 2007 kobject_put(&fs_devs->fsid_kobj); 2008 return error; 2009 } 2010 2011 fs_devs->devices_kobj = kobject_create_and_add("devices", 2012 &fs_devs->fsid_kobj); 2013 if (!fs_devs->devices_kobj) { 2014 btrfs_err(fs_devs->fs_info, 2015 "failed to init sysfs device interface"); 2016 btrfs_sysfs_remove_fsid(fs_devs); 2017 return -ENOMEM; 2018 } 2019 2020 fs_devs->devinfo_kobj = kobject_create_and_add("devinfo", 2021 &fs_devs->fsid_kobj); 2022 if (!fs_devs->devinfo_kobj) { 2023 btrfs_err(fs_devs->fs_info, 2024 "failed to init sysfs devinfo kobject"); 2025 btrfs_sysfs_remove_fsid(fs_devs); 2026 return -ENOMEM; 2027 } 2028 2029 return 0; 2030 } 2031 2032 int btrfs_sysfs_add_mounted(struct btrfs_fs_info *fs_info) 2033 { 2034 int error; 2035 struct btrfs_fs_devices *fs_devs = fs_info->fs_devices; 2036 struct kobject *fsid_kobj = &fs_devs->fsid_kobj; 2037 2038 error = btrfs_sysfs_add_fs_devices(fs_devs); 2039 if (error) 2040 return error; 2041 2042 error = sysfs_create_files(fsid_kobj, btrfs_attrs); 2043 if (error) { 2044 btrfs_sysfs_remove_fs_devices(fs_devs); 2045 return error; 2046 } 2047 2048 error = sysfs_create_group(fsid_kobj, 2049 &btrfs_feature_attr_group); 2050 if (error) 2051 goto failure; 2052 2053 #ifdef CONFIG_BTRFS_DEBUG 2054 fs_info->debug_kobj = kobject_create_and_add("debug", fsid_kobj); 2055 if (!fs_info->debug_kobj) { 2056 error = -ENOMEM; 2057 goto failure; 2058 } 2059 2060 error = sysfs_create_files(fs_info->debug_kobj, btrfs_debug_mount_attrs); 2061 if (error) 2062 goto failure; 2063 #endif 2064 2065 /* Discard directory */ 2066 fs_info->discard_kobj = kobject_create_and_add("discard", fsid_kobj); 2067 if (!fs_info->discard_kobj) { 2068 error = -ENOMEM; 2069 goto failure; 2070 } 2071 2072 error = sysfs_create_files(fs_info->discard_kobj, discard_attrs); 2073 if (error) 2074 goto failure; 2075 2076 error = addrm_unknown_feature_attrs(fs_info, true); 2077 if (error) 2078 goto failure; 2079 2080 error = sysfs_create_link(fsid_kobj, &fs_info->sb->s_bdi->dev->kobj, "bdi"); 2081 if (error) 2082 goto failure; 2083 2084 fs_info->space_info_kobj = kobject_create_and_add("allocation", 2085 fsid_kobj); 2086 if (!fs_info->space_info_kobj) { 2087 error = -ENOMEM; 2088 goto failure; 2089 } 2090 2091 error = sysfs_create_files(fs_info->space_info_kobj, allocation_attrs); 2092 if (error) 2093 goto failure; 2094 2095 return 0; 2096 failure: 2097 btrfs_sysfs_remove_mounted(fs_info); 2098 return error; 2099 } 2100 2101 static ssize_t qgroup_enabled_show(struct kobject *qgroups_kobj, 2102 struct kobj_attribute *a, 2103 char *buf) 2104 { 2105 struct btrfs_fs_info *fs_info = to_fs_info(qgroups_kobj->parent); 2106 bool enabled; 2107 2108 spin_lock(&fs_info->qgroup_lock); 2109 enabled = fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_ON; 2110 spin_unlock(&fs_info->qgroup_lock); 2111 2112 return sysfs_emit(buf, "%d\n", enabled); 2113 } 2114 BTRFS_ATTR(qgroups, enabled, qgroup_enabled_show); 2115 2116 static ssize_t qgroup_mode_show(struct kobject *qgroups_kobj, 2117 struct kobj_attribute *a, 2118 char *buf) 2119 { 2120 struct btrfs_fs_info *fs_info = to_fs_info(qgroups_kobj->parent); 2121 ssize_t ret = 0; 2122 2123 spin_lock(&fs_info->qgroup_lock); 2124 ASSERT(btrfs_qgroup_enabled(fs_info)); 2125 switch (btrfs_qgroup_mode(fs_info)) { 2126 case BTRFS_QGROUP_MODE_FULL: 2127 ret = sysfs_emit(buf, "qgroup\n"); 2128 break; 2129 case BTRFS_QGROUP_MODE_SIMPLE: 2130 ret = sysfs_emit(buf, "squota\n"); 2131 break; 2132 default: 2133 btrfs_warn(fs_info, "unexpected qgroup mode %d\n", 2134 btrfs_qgroup_mode(fs_info)); 2135 break; 2136 } 2137 spin_unlock(&fs_info->qgroup_lock); 2138 2139 return ret; 2140 } 2141 BTRFS_ATTR(qgroups, mode, qgroup_mode_show); 2142 2143 static ssize_t qgroup_inconsistent_show(struct kobject *qgroups_kobj, 2144 struct kobj_attribute *a, 2145 char *buf) 2146 { 2147 struct btrfs_fs_info *fs_info = to_fs_info(qgroups_kobj->parent); 2148 bool inconsistent; 2149 2150 spin_lock(&fs_info->qgroup_lock); 2151 inconsistent = (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT); 2152 spin_unlock(&fs_info->qgroup_lock); 2153 2154 return sysfs_emit(buf, "%d\n", inconsistent); 2155 } 2156 BTRFS_ATTR(qgroups, inconsistent, qgroup_inconsistent_show); 2157 2158 static ssize_t qgroup_drop_subtree_thres_show(struct kobject *qgroups_kobj, 2159 struct kobj_attribute *a, 2160 char *buf) 2161 { 2162 struct btrfs_fs_info *fs_info = to_fs_info(qgroups_kobj->parent); 2163 u8 result; 2164 2165 spin_lock(&fs_info->qgroup_lock); 2166 result = fs_info->qgroup_drop_subtree_thres; 2167 spin_unlock(&fs_info->qgroup_lock); 2168 2169 return sysfs_emit(buf, "%d\n", result); 2170 } 2171 2172 static ssize_t qgroup_drop_subtree_thres_store(struct kobject *qgroups_kobj, 2173 struct kobj_attribute *a, 2174 const char *buf, size_t len) 2175 { 2176 struct btrfs_fs_info *fs_info = to_fs_info(qgroups_kobj->parent); 2177 u8 new_thres; 2178 int ret; 2179 2180 ret = kstrtou8(buf, 10, &new_thres); 2181 if (ret) 2182 return -EINVAL; 2183 2184 if (new_thres > BTRFS_MAX_LEVEL) 2185 return -EINVAL; 2186 2187 spin_lock(&fs_info->qgroup_lock); 2188 fs_info->qgroup_drop_subtree_thres = new_thres; 2189 spin_unlock(&fs_info->qgroup_lock); 2190 2191 return len; 2192 } 2193 BTRFS_ATTR_RW(qgroups, drop_subtree_threshold, qgroup_drop_subtree_thres_show, 2194 qgroup_drop_subtree_thres_store); 2195 2196 /* 2197 * Qgroups global info 2198 * 2199 * Path: /sys/fs/btrfs/<uuid>/qgroups/ 2200 */ 2201 static struct attribute *qgroups_attrs[] = { 2202 BTRFS_ATTR_PTR(qgroups, enabled), 2203 BTRFS_ATTR_PTR(qgroups, inconsistent), 2204 BTRFS_ATTR_PTR(qgroups, drop_subtree_threshold), 2205 BTRFS_ATTR_PTR(qgroups, mode), 2206 NULL 2207 }; 2208 ATTRIBUTE_GROUPS(qgroups); 2209 2210 static void qgroups_release(struct kobject *kobj) 2211 { 2212 kfree(kobj); 2213 } 2214 2215 static const struct kobj_type qgroups_ktype = { 2216 .sysfs_ops = &kobj_sysfs_ops, 2217 .default_groups = qgroups_groups, 2218 .release = qgroups_release, 2219 }; 2220 2221 static inline struct btrfs_fs_info *qgroup_kobj_to_fs_info(struct kobject *kobj) 2222 { 2223 return to_fs_info(kobj->parent->parent); 2224 } 2225 2226 #define QGROUP_ATTR(_member, _show_name) \ 2227 static ssize_t btrfs_qgroup_show_##_member(struct kobject *qgroup_kobj, \ 2228 struct kobj_attribute *a, \ 2229 char *buf) \ 2230 { \ 2231 struct btrfs_fs_info *fs_info = qgroup_kobj_to_fs_info(qgroup_kobj); \ 2232 struct btrfs_qgroup *qgroup = container_of(qgroup_kobj, \ 2233 struct btrfs_qgroup, kobj); \ 2234 return btrfs_show_u64(&qgroup->_member, &fs_info->qgroup_lock, buf); \ 2235 } \ 2236 BTRFS_ATTR(qgroup, _show_name, btrfs_qgroup_show_##_member) 2237 2238 #define QGROUP_RSV_ATTR(_name, _type) \ 2239 static ssize_t btrfs_qgroup_rsv_show_##_name(struct kobject *qgroup_kobj, \ 2240 struct kobj_attribute *a, \ 2241 char *buf) \ 2242 { \ 2243 struct btrfs_fs_info *fs_info = qgroup_kobj_to_fs_info(qgroup_kobj); \ 2244 struct btrfs_qgroup *qgroup = container_of(qgroup_kobj, \ 2245 struct btrfs_qgroup, kobj); \ 2246 return btrfs_show_u64(&qgroup->rsv.values[_type], \ 2247 &fs_info->qgroup_lock, buf); \ 2248 } \ 2249 BTRFS_ATTR(qgroup, rsv_##_name, btrfs_qgroup_rsv_show_##_name) 2250 2251 QGROUP_ATTR(rfer, referenced); 2252 QGROUP_ATTR(excl, exclusive); 2253 QGROUP_ATTR(max_rfer, max_referenced); 2254 QGROUP_ATTR(max_excl, max_exclusive); 2255 QGROUP_ATTR(lim_flags, limit_flags); 2256 QGROUP_RSV_ATTR(data, BTRFS_QGROUP_RSV_DATA); 2257 QGROUP_RSV_ATTR(meta_pertrans, BTRFS_QGROUP_RSV_META_PERTRANS); 2258 QGROUP_RSV_ATTR(meta_prealloc, BTRFS_QGROUP_RSV_META_PREALLOC); 2259 2260 /* 2261 * Qgroup information. 2262 * 2263 * Path: /sys/fs/btrfs/<uuid>/qgroups/<level>_<qgroupid>/ 2264 */ 2265 static struct attribute *qgroup_attrs[] = { 2266 BTRFS_ATTR_PTR(qgroup, referenced), 2267 BTRFS_ATTR_PTR(qgroup, exclusive), 2268 BTRFS_ATTR_PTR(qgroup, max_referenced), 2269 BTRFS_ATTR_PTR(qgroup, max_exclusive), 2270 BTRFS_ATTR_PTR(qgroup, limit_flags), 2271 BTRFS_ATTR_PTR(qgroup, rsv_data), 2272 BTRFS_ATTR_PTR(qgroup, rsv_meta_pertrans), 2273 BTRFS_ATTR_PTR(qgroup, rsv_meta_prealloc), 2274 NULL 2275 }; 2276 ATTRIBUTE_GROUPS(qgroup); 2277 2278 static void qgroup_release(struct kobject *kobj) 2279 { 2280 struct btrfs_qgroup *qgroup = container_of(kobj, struct btrfs_qgroup, kobj); 2281 2282 memset(&qgroup->kobj, 0, sizeof(*kobj)); 2283 } 2284 2285 static const struct kobj_type qgroup_ktype = { 2286 .sysfs_ops = &kobj_sysfs_ops, 2287 .release = qgroup_release, 2288 .default_groups = qgroup_groups, 2289 }; 2290 2291 int btrfs_sysfs_add_one_qgroup(struct btrfs_fs_info *fs_info, 2292 struct btrfs_qgroup *qgroup) 2293 { 2294 struct kobject *qgroups_kobj = fs_info->qgroups_kobj; 2295 int ret; 2296 2297 if (test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state)) 2298 return 0; 2299 if (qgroup->kobj.state_initialized) 2300 return 0; 2301 if (!qgroups_kobj) 2302 return -EINVAL; 2303 2304 ret = kobject_init_and_add(&qgroup->kobj, &qgroup_ktype, qgroups_kobj, 2305 "%hu_%llu", btrfs_qgroup_level(qgroup->qgroupid), 2306 btrfs_qgroup_subvolid(qgroup->qgroupid)); 2307 if (ret < 0) 2308 kobject_put(&qgroup->kobj); 2309 2310 return ret; 2311 } 2312 2313 void btrfs_sysfs_del_qgroups(struct btrfs_fs_info *fs_info) 2314 { 2315 struct btrfs_qgroup *qgroup; 2316 struct btrfs_qgroup *next; 2317 2318 if (test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state)) 2319 return; 2320 2321 rbtree_postorder_for_each_entry_safe(qgroup, next, 2322 &fs_info->qgroup_tree, node) 2323 btrfs_sysfs_del_one_qgroup(fs_info, qgroup); 2324 if (fs_info->qgroups_kobj) { 2325 kobject_del(fs_info->qgroups_kobj); 2326 kobject_put(fs_info->qgroups_kobj); 2327 fs_info->qgroups_kobj = NULL; 2328 } 2329 } 2330 2331 /* Called when qgroups get initialized, thus there is no need for locking */ 2332 int btrfs_sysfs_add_qgroups(struct btrfs_fs_info *fs_info) 2333 { 2334 struct kobject *fsid_kobj = &fs_info->fs_devices->fsid_kobj; 2335 struct btrfs_qgroup *qgroup; 2336 struct btrfs_qgroup *next; 2337 int ret = 0; 2338 2339 if (test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state)) 2340 return 0; 2341 2342 ASSERT(fsid_kobj); 2343 if (fs_info->qgroups_kobj) 2344 return 0; 2345 2346 fs_info->qgroups_kobj = kzalloc(sizeof(struct kobject), GFP_KERNEL); 2347 if (!fs_info->qgroups_kobj) 2348 return -ENOMEM; 2349 2350 ret = kobject_init_and_add(fs_info->qgroups_kobj, &qgroups_ktype, 2351 fsid_kobj, "qgroups"); 2352 if (ret < 0) 2353 goto out; 2354 2355 rbtree_postorder_for_each_entry_safe(qgroup, next, 2356 &fs_info->qgroup_tree, node) { 2357 ret = btrfs_sysfs_add_one_qgroup(fs_info, qgroup); 2358 if (ret < 0) 2359 goto out; 2360 } 2361 2362 out: 2363 if (ret < 0) 2364 btrfs_sysfs_del_qgroups(fs_info); 2365 return ret; 2366 } 2367 2368 void btrfs_sysfs_del_one_qgroup(struct btrfs_fs_info *fs_info, 2369 struct btrfs_qgroup *qgroup) 2370 { 2371 if (test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state)) 2372 return; 2373 2374 if (qgroup->kobj.state_initialized) { 2375 kobject_del(&qgroup->kobj); 2376 kobject_put(&qgroup->kobj); 2377 } 2378 } 2379 2380 /* 2381 * Change per-fs features in /sys/fs/btrfs/UUID/features to match current 2382 * values in superblock. Call after any changes to incompat/compat_ro flags 2383 */ 2384 void btrfs_sysfs_feature_update(struct btrfs_fs_info *fs_info) 2385 { 2386 struct kobject *fsid_kobj; 2387 int ret; 2388 2389 if (!fs_info) 2390 return; 2391 2392 fsid_kobj = &fs_info->fs_devices->fsid_kobj; 2393 if (!fsid_kobj->state_initialized) 2394 return; 2395 2396 ret = sysfs_update_group(fsid_kobj, &btrfs_feature_attr_group); 2397 if (ret < 0) 2398 btrfs_warn(fs_info, 2399 "failed to update /sys/fs/btrfs/%pU/features: %d", 2400 fs_info->fs_devices->fsid, ret); 2401 } 2402 2403 int __init btrfs_init_sysfs(void) 2404 { 2405 int ret; 2406 2407 btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj); 2408 if (!btrfs_kset) 2409 return -ENOMEM; 2410 2411 init_feature_attrs(); 2412 ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); 2413 if (ret) 2414 goto out2; 2415 ret = sysfs_merge_group(&btrfs_kset->kobj, 2416 &btrfs_static_feature_attr_group); 2417 if (ret) 2418 goto out_remove_group; 2419 2420 #ifdef CONFIG_BTRFS_DEBUG 2421 ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_debug_feature_attr_group); 2422 if (ret) { 2423 sysfs_unmerge_group(&btrfs_kset->kobj, 2424 &btrfs_static_feature_attr_group); 2425 goto out_remove_group; 2426 } 2427 #endif 2428 2429 return 0; 2430 2431 out_remove_group: 2432 sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); 2433 out2: 2434 kset_unregister(btrfs_kset); 2435 2436 return ret; 2437 } 2438 2439 void __cold btrfs_exit_sysfs(void) 2440 { 2441 sysfs_unmerge_group(&btrfs_kset->kobj, 2442 &btrfs_static_feature_attr_group); 2443 sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); 2444 #ifdef CONFIG_BTRFS_DEBUG 2445 sysfs_remove_group(&btrfs_kset->kobj, &btrfs_debug_feature_attr_group); 2446 #endif 2447 kset_unregister(btrfs_kset); 2448 } 2449