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 <linux/string_choices.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, NULL), \ 87 .feature_set = _feature_set, \ 88 .feature_bit = _feature_prefix ##_## _feature_bit, \ 89 } 90 #define BTRFS_FEAT_ATTR_PTR(_name) \ 91 (&btrfs_attr_features_##_name.kobj_attr.attr) 92 93 #define BTRFS_FEAT_ATTR_COMPAT(name, feature) \ 94 BTRFS_FEAT_ATTR(name, FEAT_COMPAT, BTRFS_FEATURE_COMPAT, feature) 95 #define BTRFS_FEAT_ATTR_COMPAT_RO(name, feature) \ 96 BTRFS_FEAT_ATTR(name, FEAT_COMPAT_RO, BTRFS_FEATURE_COMPAT_RO, feature) 97 #define BTRFS_FEAT_ATTR_INCOMPAT(name, feature) \ 98 BTRFS_FEAT_ATTR(name, FEAT_INCOMPAT, BTRFS_FEATURE_INCOMPAT, feature) 99 100 static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj); 101 static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj); 102 static struct kobject *get_btrfs_kobj(struct kobject *kobj); 103 104 static struct btrfs_feature_attr *to_btrfs_feature_attr(struct kobj_attribute *a) 105 { 106 return container_of(a, struct btrfs_feature_attr, kobj_attr); 107 } 108 109 static struct kobj_attribute *attr_to_btrfs_attr(struct attribute *attr) 110 { 111 return container_of(attr, struct kobj_attribute, attr); 112 } 113 114 static struct btrfs_feature_attr *attr_to_btrfs_feature_attr( 115 struct attribute *attr) 116 { 117 return to_btrfs_feature_attr(attr_to_btrfs_attr(attr)); 118 } 119 120 static u64 get_features(struct btrfs_fs_info *fs_info, 121 enum btrfs_feature_set set) 122 { 123 struct btrfs_super_block *disk_super = fs_info->super_copy; 124 if (set == FEAT_COMPAT) 125 return btrfs_super_compat_flags(disk_super); 126 else if (set == FEAT_COMPAT_RO) 127 return btrfs_super_compat_ro_flags(disk_super); 128 else 129 return btrfs_super_incompat_flags(disk_super); 130 } 131 132 static ssize_t btrfs_feature_attr_show(struct kobject *kobj, 133 struct kobj_attribute *a, char *buf) 134 { 135 int val = 0; 136 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 137 struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a); 138 139 if (fs_info) { 140 u64 features = get_features(fs_info, fa->feature_set); 141 if (features & fa->feature_bit) 142 val = 1; 143 } 144 145 return sysfs_emit(buf, "%d\n", val); 146 } 147 148 static umode_t btrfs_feature_visible(struct kobject *kobj, 149 struct attribute *attr, int unused) 150 { 151 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 152 umode_t mode = attr->mode; 153 154 if (fs_info) { 155 struct btrfs_feature_attr *fa; 156 u64 features; 157 158 fa = attr_to_btrfs_feature_attr(attr); 159 features = get_features(fs_info, fa->feature_set); 160 161 if (!(features & fa->feature_bit)) 162 mode = 0; 163 } 164 165 return mode; 166 } 167 168 BTRFS_FEAT_ATTR_INCOMPAT(default_subvol, DEFAULT_SUBVOL); 169 BTRFS_FEAT_ATTR_INCOMPAT(mixed_groups, MIXED_GROUPS); 170 BTRFS_FEAT_ATTR_INCOMPAT(compress_lzo, COMPRESS_LZO); 171 BTRFS_FEAT_ATTR_INCOMPAT(compress_zstd, COMPRESS_ZSTD); 172 BTRFS_FEAT_ATTR_INCOMPAT(extended_iref, EXTENDED_IREF); 173 BTRFS_FEAT_ATTR_INCOMPAT(raid56, RAID56); 174 BTRFS_FEAT_ATTR_INCOMPAT(skinny_metadata, SKINNY_METADATA); 175 BTRFS_FEAT_ATTR_INCOMPAT(no_holes, NO_HOLES); 176 BTRFS_FEAT_ATTR_INCOMPAT(metadata_uuid, METADATA_UUID); 177 BTRFS_FEAT_ATTR_COMPAT_RO(free_space_tree, FREE_SPACE_TREE); 178 BTRFS_FEAT_ATTR_COMPAT_RO(block_group_tree, BLOCK_GROUP_TREE); 179 BTRFS_FEAT_ATTR_INCOMPAT(raid1c34, RAID1C34); 180 BTRFS_FEAT_ATTR_INCOMPAT(simple_quota, SIMPLE_QUOTA); 181 #ifdef CONFIG_BLK_DEV_ZONED 182 BTRFS_FEAT_ATTR_INCOMPAT(zoned, ZONED); 183 #endif 184 #ifdef CONFIG_BTRFS_EXPERIMENTAL 185 /* Remove once support for extent tree v2 is feature complete */ 186 BTRFS_FEAT_ATTR_INCOMPAT(extent_tree_v2, EXTENT_TREE_V2); 187 /* Remove once support for raid stripe tree is feature complete. */ 188 BTRFS_FEAT_ATTR_INCOMPAT(raid_stripe_tree, RAID_STRIPE_TREE); 189 /* Remove once support for remap tree is feature complete. */ 190 BTRFS_FEAT_ATTR_INCOMPAT(remap_tree, REMAP_TREE); 191 #endif 192 #ifdef CONFIG_FS_VERITY 193 BTRFS_FEAT_ATTR_COMPAT_RO(verity, VERITY); 194 #endif 195 196 /* 197 * Features which depend on feature bits and may differ between each fs. 198 * 199 * /sys/fs/btrfs/features - all available features implemented by this version 200 * /sys/fs/btrfs/UUID/features - features of the fs which are enabled or 201 * can be changed on a mounted filesystem. 202 */ 203 static struct attribute *btrfs_supported_feature_attrs[] = { 204 BTRFS_FEAT_ATTR_PTR(default_subvol), 205 BTRFS_FEAT_ATTR_PTR(mixed_groups), 206 BTRFS_FEAT_ATTR_PTR(compress_lzo), 207 BTRFS_FEAT_ATTR_PTR(compress_zstd), 208 BTRFS_FEAT_ATTR_PTR(extended_iref), 209 BTRFS_FEAT_ATTR_PTR(raid56), 210 BTRFS_FEAT_ATTR_PTR(skinny_metadata), 211 BTRFS_FEAT_ATTR_PTR(no_holes), 212 BTRFS_FEAT_ATTR_PTR(metadata_uuid), 213 BTRFS_FEAT_ATTR_PTR(free_space_tree), 214 BTRFS_FEAT_ATTR_PTR(raid1c34), 215 BTRFS_FEAT_ATTR_PTR(block_group_tree), 216 BTRFS_FEAT_ATTR_PTR(simple_quota), 217 #ifdef CONFIG_BLK_DEV_ZONED 218 BTRFS_FEAT_ATTR_PTR(zoned), 219 #endif 220 #ifdef CONFIG_BTRFS_EXPERIMENTAL 221 BTRFS_FEAT_ATTR_PTR(extent_tree_v2), 222 BTRFS_FEAT_ATTR_PTR(raid_stripe_tree), 223 BTRFS_FEAT_ATTR_PTR(remap_tree), 224 #endif 225 #ifdef CONFIG_FS_VERITY 226 BTRFS_FEAT_ATTR_PTR(verity), 227 #endif 228 NULL 229 }; 230 231 static const struct attribute_group btrfs_feature_attr_group = { 232 .name = "features", 233 .is_visible = btrfs_feature_visible, 234 .attrs = btrfs_supported_feature_attrs, 235 }; 236 237 static ssize_t rmdir_subvol_show(struct kobject *kobj, 238 struct kobj_attribute *ka, char *buf) 239 { 240 return sysfs_emit(buf, "0\n"); 241 } 242 BTRFS_ATTR(static_feature, rmdir_subvol, rmdir_subvol_show); 243 244 static ssize_t supported_checksums_show(struct kobject *kobj, 245 struct kobj_attribute *a, char *buf) 246 { 247 ssize_t ret = 0; 248 int i; 249 250 for (i = 0; i < btrfs_get_num_csums(); i++) { 251 /* 252 * This "trick" only works as long as 'enum btrfs_csum_type' has 253 * no holes in it 254 */ 255 ret += sysfs_emit_at(buf, ret, "%s%s", (i == 0 ? "" : " "), 256 btrfs_super_csum_name(i)); 257 258 } 259 260 ret += sysfs_emit_at(buf, ret, "\n"); 261 return ret; 262 } 263 BTRFS_ATTR(static_feature, supported_checksums, supported_checksums_show); 264 265 static ssize_t send_stream_version_show(struct kobject *kobj, 266 struct kobj_attribute *ka, char *buf) 267 { 268 return sysfs_emit(buf, "%d\n", BTRFS_SEND_STREAM_VERSION); 269 } 270 BTRFS_ATTR(static_feature, send_stream_version, send_stream_version_show); 271 272 static const char *rescue_opts[] = { 273 "usebackuproot", 274 "nologreplay", 275 "ignorebadroots", 276 "ignoredatacsums", 277 "ignoremetacsums", 278 "ignoresuperflags", 279 "all", 280 }; 281 282 static ssize_t supported_rescue_options_show(struct kobject *kobj, 283 struct kobj_attribute *a, 284 char *buf) 285 { 286 ssize_t ret = 0; 287 int i; 288 289 for (i = 0; i < ARRAY_SIZE(rescue_opts); i++) 290 ret += sysfs_emit_at(buf, ret, "%s%s", (i ? " " : ""), rescue_opts[i]); 291 ret += sysfs_emit_at(buf, ret, "\n"); 292 return ret; 293 } 294 BTRFS_ATTR(static_feature, supported_rescue_options, 295 supported_rescue_options_show); 296 297 static ssize_t supported_sectorsizes_show(struct kobject *kobj, 298 struct kobj_attribute *a, 299 char *buf) 300 { 301 ssize_t ret = 0; 302 bool has_output = false; 303 304 for (u32 cur = BTRFS_MIN_BLOCKSIZE; cur <= BTRFS_MAX_BLOCKSIZE; cur *= 2) { 305 if (!btrfs_supported_blocksize(cur)) 306 continue; 307 if (has_output) 308 ret += sysfs_emit_at(buf, ret, " "); 309 ret += sysfs_emit_at(buf, ret, "%u", cur); 310 has_output = true; 311 } 312 ret += sysfs_emit_at(buf, ret, "\n"); 313 return ret; 314 } 315 BTRFS_ATTR(static_feature, supported_sectorsizes, 316 supported_sectorsizes_show); 317 318 static ssize_t acl_show(struct kobject *kobj, struct kobj_attribute *a, char *buf) 319 { 320 return sysfs_emit(buf, "%d\n", IS_ENABLED(CONFIG_BTRFS_FS_POSIX_ACL)); 321 } 322 BTRFS_ATTR(static_feature, acl, acl_show); 323 324 static ssize_t temp_fsid_supported_show(struct kobject *kobj, 325 struct kobj_attribute *a, char *buf) 326 { 327 return sysfs_emit(buf, "0\n"); 328 } 329 BTRFS_ATTR(static_feature, temp_fsid, temp_fsid_supported_show); 330 331 /* 332 * Features which only depend on kernel version. 333 * 334 * These are listed in /sys/fs/btrfs/features along with 335 * btrfs_supported_feature_attrs. 336 */ 337 static struct attribute *btrfs_supported_static_feature_attrs[] = { 338 BTRFS_ATTR_PTR(static_feature, acl), 339 BTRFS_ATTR_PTR(static_feature, rmdir_subvol), 340 BTRFS_ATTR_PTR(static_feature, supported_checksums), 341 BTRFS_ATTR_PTR(static_feature, send_stream_version), 342 BTRFS_ATTR_PTR(static_feature, supported_rescue_options), 343 BTRFS_ATTR_PTR(static_feature, supported_sectorsizes), 344 BTRFS_ATTR_PTR(static_feature, temp_fsid), 345 NULL 346 }; 347 348 static const struct attribute_group btrfs_static_feature_attr_group = { 349 .name = "features", 350 .attrs = btrfs_supported_static_feature_attrs, 351 }; 352 353 /* 354 * Discard statistics and tunables 355 */ 356 #define discard_to_fs_info(_kobj) to_fs_info(get_btrfs_kobj(_kobj)) 357 358 static ssize_t btrfs_discardable_bytes_show(struct kobject *kobj, 359 struct kobj_attribute *a, 360 char *buf) 361 { 362 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 363 364 return sysfs_emit(buf, "%lld\n", 365 atomic64_read(&fs_info->discard_ctl.discardable_bytes)); 366 } 367 BTRFS_ATTR(discard, discardable_bytes, btrfs_discardable_bytes_show); 368 369 static ssize_t btrfs_discardable_extents_show(struct kobject *kobj, 370 struct kobj_attribute *a, 371 char *buf) 372 { 373 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 374 375 return sysfs_emit(buf, "%d\n", 376 atomic_read(&fs_info->discard_ctl.discardable_extents)); 377 } 378 BTRFS_ATTR(discard, discardable_extents, btrfs_discardable_extents_show); 379 380 static ssize_t btrfs_discard_bitmap_bytes_show(struct kobject *kobj, 381 struct kobj_attribute *a, 382 char *buf) 383 { 384 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 385 386 return sysfs_emit(buf, "%llu\n", 387 fs_info->discard_ctl.discard_bitmap_bytes); 388 } 389 BTRFS_ATTR(discard, discard_bitmap_bytes, btrfs_discard_bitmap_bytes_show); 390 391 static ssize_t btrfs_discard_bytes_saved_show(struct kobject *kobj, 392 struct kobj_attribute *a, 393 char *buf) 394 { 395 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 396 397 return sysfs_emit(buf, "%lld\n", 398 atomic64_read(&fs_info->discard_ctl.discard_bytes_saved)); 399 } 400 BTRFS_ATTR(discard, discard_bytes_saved, btrfs_discard_bytes_saved_show); 401 402 static ssize_t btrfs_discard_extent_bytes_show(struct kobject *kobj, 403 struct kobj_attribute *a, 404 char *buf) 405 { 406 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 407 408 return sysfs_emit(buf, "%llu\n", 409 fs_info->discard_ctl.discard_extent_bytes); 410 } 411 BTRFS_ATTR(discard, discard_extent_bytes, btrfs_discard_extent_bytes_show); 412 413 static ssize_t btrfs_discard_iops_limit_show(struct kobject *kobj, 414 struct kobj_attribute *a, 415 char *buf) 416 { 417 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 418 419 return sysfs_emit(buf, "%u\n", 420 READ_ONCE(fs_info->discard_ctl.iops_limit)); 421 } 422 423 static ssize_t btrfs_discard_iops_limit_store(struct kobject *kobj, 424 struct kobj_attribute *a, 425 const char *buf, size_t len) 426 { 427 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 428 struct btrfs_discard_ctl *discard_ctl = &fs_info->discard_ctl; 429 u32 iops_limit; 430 int ret; 431 432 ret = kstrtou32(buf, 10, &iops_limit); 433 if (ret) 434 return -EINVAL; 435 436 WRITE_ONCE(discard_ctl->iops_limit, iops_limit); 437 btrfs_discard_calc_delay(discard_ctl); 438 btrfs_discard_schedule_work(discard_ctl, true); 439 return len; 440 } 441 BTRFS_ATTR_RW(discard, iops_limit, btrfs_discard_iops_limit_show, 442 btrfs_discard_iops_limit_store); 443 444 static ssize_t btrfs_discard_kbps_limit_show(struct kobject *kobj, 445 struct kobj_attribute *a, 446 char *buf) 447 { 448 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 449 450 return sysfs_emit(buf, "%u\n", 451 READ_ONCE(fs_info->discard_ctl.kbps_limit)); 452 } 453 454 static ssize_t btrfs_discard_kbps_limit_store(struct kobject *kobj, 455 struct kobj_attribute *a, 456 const char *buf, size_t len) 457 { 458 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 459 struct btrfs_discard_ctl *discard_ctl = &fs_info->discard_ctl; 460 u32 kbps_limit; 461 int ret; 462 463 ret = kstrtou32(buf, 10, &kbps_limit); 464 if (ret) 465 return -EINVAL; 466 467 WRITE_ONCE(discard_ctl->kbps_limit, kbps_limit); 468 btrfs_discard_schedule_work(discard_ctl, true); 469 return len; 470 } 471 BTRFS_ATTR_RW(discard, kbps_limit, btrfs_discard_kbps_limit_show, 472 btrfs_discard_kbps_limit_store); 473 474 static ssize_t btrfs_discard_max_discard_size_show(struct kobject *kobj, 475 struct kobj_attribute *a, 476 char *buf) 477 { 478 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 479 480 return sysfs_emit(buf, "%llu\n", 481 READ_ONCE(fs_info->discard_ctl.max_discard_size)); 482 } 483 484 static ssize_t btrfs_discard_max_discard_size_store(struct kobject *kobj, 485 struct kobj_attribute *a, 486 const char *buf, size_t len) 487 { 488 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 489 struct btrfs_discard_ctl *discard_ctl = &fs_info->discard_ctl; 490 u64 max_discard_size; 491 int ret; 492 493 ret = kstrtou64(buf, 10, &max_discard_size); 494 if (ret) 495 return -EINVAL; 496 497 WRITE_ONCE(discard_ctl->max_discard_size, max_discard_size); 498 499 return len; 500 } 501 BTRFS_ATTR_RW(discard, max_discard_size, btrfs_discard_max_discard_size_show, 502 btrfs_discard_max_discard_size_store); 503 504 /* 505 * Per-filesystem stats for discard (when mounted with discard=async). 506 * 507 * Path: /sys/fs/btrfs/<uuid>/discard/ 508 */ 509 static const struct attribute *discard_attrs[] = { 510 BTRFS_ATTR_PTR(discard, discardable_bytes), 511 BTRFS_ATTR_PTR(discard, discardable_extents), 512 BTRFS_ATTR_PTR(discard, discard_bitmap_bytes), 513 BTRFS_ATTR_PTR(discard, discard_bytes_saved), 514 BTRFS_ATTR_PTR(discard, discard_extent_bytes), 515 BTRFS_ATTR_PTR(discard, iops_limit), 516 BTRFS_ATTR_PTR(discard, kbps_limit), 517 BTRFS_ATTR_PTR(discard, max_discard_size), 518 NULL, 519 }; 520 521 #ifdef CONFIG_BTRFS_DEBUG 522 523 /* 524 * Per-filesystem runtime debugging exported via sysfs. 525 * 526 * Path: /sys/fs/btrfs/UUID/debug/ 527 */ 528 static const struct attribute *btrfs_debug_mount_attrs[] = { 529 NULL, 530 }; 531 532 /* 533 * Runtime debugging exported via sysfs, applies to all mounted filesystems. 534 * 535 * Path: /sys/fs/btrfs/debug 536 */ 537 static struct attribute *btrfs_debug_feature_attrs[] = { 538 NULL 539 }; 540 541 static const struct attribute_group btrfs_debug_feature_attr_group = { 542 .name = "debug", 543 .attrs = btrfs_debug_feature_attrs, 544 }; 545 546 #endif 547 548 static ssize_t btrfs_show_u64(u64 *value_ptr, spinlock_t *lock, char *buf) 549 { 550 u64 val; 551 if (lock) 552 spin_lock(lock); 553 val = *value_ptr; 554 if (lock) 555 spin_unlock(lock); 556 return sysfs_emit(buf, "%llu\n", val); 557 } 558 559 static ssize_t global_rsv_size_show(struct kobject *kobj, 560 struct kobj_attribute *ka, char *buf) 561 { 562 struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); 563 struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 564 return btrfs_show_u64(&block_rsv->size, &block_rsv->lock, buf); 565 } 566 BTRFS_ATTR(allocation, global_rsv_size, global_rsv_size_show); 567 568 static ssize_t global_rsv_reserved_show(struct kobject *kobj, 569 struct kobj_attribute *a, char *buf) 570 { 571 struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); 572 struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 573 return btrfs_show_u64(&block_rsv->reserved, &block_rsv->lock, buf); 574 } 575 BTRFS_ATTR(allocation, global_rsv_reserved, global_rsv_reserved_show); 576 577 #define to_space_info(_kobj) container_of(_kobj, struct btrfs_space_info, kobj) 578 #define to_raid_kobj(_kobj) container_of(_kobj, struct raid_kobject, kobj) 579 580 static ssize_t raid_bytes_show(struct kobject *kobj, 581 struct kobj_attribute *attr, char *buf); 582 BTRFS_ATTR(raid, total_bytes, raid_bytes_show); 583 BTRFS_ATTR(raid, used_bytes, raid_bytes_show); 584 585 static ssize_t raid_bytes_show(struct kobject *kobj, 586 struct kobj_attribute *attr, char *buf) 587 588 { 589 struct btrfs_space_info *sinfo = to_space_info(kobj->parent); 590 struct btrfs_block_group *block_group; 591 int index = btrfs_bg_flags_to_raid_index(to_raid_kobj(kobj)->flags); 592 u64 val = 0; 593 594 down_read(&sinfo->groups_sem); 595 list_for_each_entry(block_group, &sinfo->block_groups[index], list) { 596 if (&attr->attr == BTRFS_ATTR_PTR(raid, total_bytes)) 597 val += block_group->length; 598 else 599 val += block_group->used; 600 } 601 up_read(&sinfo->groups_sem); 602 return sysfs_emit(buf, "%llu\n", val); 603 } 604 605 /* 606 * Allocation information about block group profiles. 607 * 608 * Path: /sys/fs/btrfs/<uuid>/allocation/<bg-type>/<bg-profile>/ 609 */ 610 static struct attribute *raid_attrs[] = { 611 BTRFS_ATTR_PTR(raid, total_bytes), 612 BTRFS_ATTR_PTR(raid, used_bytes), 613 NULL 614 }; 615 ATTRIBUTE_GROUPS(raid); 616 617 static void release_raid_kobj(struct kobject *kobj) 618 { 619 kfree(to_raid_kobj(kobj)); 620 } 621 622 static const struct kobj_type btrfs_raid_ktype = { 623 .sysfs_ops = &kobj_sysfs_ops, 624 .release = release_raid_kobj, 625 .default_groups = raid_groups, 626 }; 627 628 #define SPACE_INFO_ATTR(field) \ 629 static ssize_t btrfs_space_info_show_##field(struct kobject *kobj, \ 630 struct kobj_attribute *a, \ 631 char *buf) \ 632 { \ 633 struct btrfs_space_info *sinfo = to_space_info(kobj); \ 634 return btrfs_show_u64(&sinfo->field, &sinfo->lock, buf); \ 635 } \ 636 BTRFS_ATTR(space_info, field, btrfs_space_info_show_##field) 637 638 static ssize_t btrfs_chunk_size_show(struct kobject *kobj, 639 struct kobj_attribute *a, char *buf) 640 { 641 struct btrfs_space_info *sinfo = to_space_info(kobj); 642 643 return sysfs_emit(buf, "%llu\n", READ_ONCE(sinfo->chunk_size)); 644 } 645 646 /* 647 * Store new chunk size in space info. Can be called on a read-only filesystem. 648 * 649 * If the new chunk size value is larger than 10% of free space it is reduced 650 * to match that limit. Alignment must be to 256M and the system chunk size 651 * cannot be set. 652 */ 653 static ssize_t btrfs_chunk_size_store(struct kobject *kobj, 654 struct kobj_attribute *a, 655 const char *buf, size_t len) 656 { 657 struct btrfs_space_info *space_info = to_space_info(kobj); 658 struct btrfs_fs_info *fs_info = to_fs_info(get_btrfs_kobj(kobj)); 659 char *retptr; 660 u64 val; 661 662 if (!capable(CAP_SYS_ADMIN)) 663 return -EPERM; 664 665 if (!fs_info->fs_devices) 666 return -EINVAL; 667 668 if (btrfs_is_zoned(fs_info)) 669 return -EINVAL; 670 671 /* System block type must not be changed. */ 672 if (space_info->flags & BTRFS_BLOCK_GROUP_SYSTEM) 673 return -EPERM; 674 675 val = memparse(buf, &retptr); 676 /* There could be trailing '\n', also catch any typos after the value */ 677 retptr = skip_spaces(retptr); 678 if (*retptr != 0 || val == 0) 679 return -EINVAL; 680 681 val = min(val, BTRFS_MAX_DATA_CHUNK_SIZE); 682 683 /* Limit stripe size to 10% of available space. */ 684 val = min(mult_perc(fs_info->fs_devices->total_rw_bytes, 10), val); 685 686 /* Must be multiple of 256M. */ 687 val &= ~((u64)SZ_256M - 1); 688 689 /* Must be at least 256M. */ 690 if (val < SZ_256M) 691 return -EINVAL; 692 693 btrfs_update_space_info_chunk_size(space_info, val); 694 695 return len; 696 } 697 698 static ssize_t btrfs_size_classes_show(struct kobject *kobj, 699 struct kobj_attribute *a, char *buf) 700 { 701 struct btrfs_space_info *sinfo = to_space_info(kobj); 702 struct btrfs_block_group *bg; 703 u32 none = 0; 704 u32 small = 0; 705 u32 medium = 0; 706 u32 large = 0; 707 708 for (int i = 0; i < BTRFS_NR_RAID_TYPES; ++i) { 709 down_read(&sinfo->groups_sem); 710 list_for_each_entry(bg, &sinfo->block_groups[i], list) { 711 if (!btrfs_block_group_should_use_size_class(bg)) 712 continue; 713 switch (bg->size_class) { 714 case BTRFS_BG_SZ_NONE: 715 none++; 716 break; 717 case BTRFS_BG_SZ_SMALL: 718 small++; 719 break; 720 case BTRFS_BG_SZ_MEDIUM: 721 medium++; 722 break; 723 case BTRFS_BG_SZ_LARGE: 724 large++; 725 break; 726 } 727 } 728 up_read(&sinfo->groups_sem); 729 } 730 return sysfs_emit(buf, "none %u\n" 731 "small %u\n" 732 "medium %u\n" 733 "large %u\n", 734 none, small, medium, large); 735 } 736 737 #ifdef CONFIG_BTRFS_DEBUG 738 /* 739 * Request chunk allocation with current chunk size. 740 */ 741 static ssize_t btrfs_force_chunk_alloc_store(struct kobject *kobj, 742 struct kobj_attribute *a, 743 const char *buf, size_t len) 744 { 745 struct btrfs_space_info *space_info = to_space_info(kobj); 746 struct btrfs_fs_info *fs_info = to_fs_info(get_btrfs_kobj(kobj)); 747 struct btrfs_trans_handle *trans; 748 bool val; 749 int ret; 750 751 if (!capable(CAP_SYS_ADMIN)) 752 return -EPERM; 753 754 if (sb_rdonly(fs_info->sb)) 755 return -EROFS; 756 757 ret = kstrtobool(buf, &val); 758 if (ret) 759 return ret; 760 761 if (!val) 762 return -EINVAL; 763 764 /* 765 * This is unsafe to be called from sysfs context and may cause 766 * unexpected problems. 767 */ 768 trans = btrfs_start_transaction(fs_info->tree_root, 0); 769 if (IS_ERR(trans)) 770 return PTR_ERR(trans); 771 ret = btrfs_force_chunk_alloc(trans, space_info->flags); 772 btrfs_end_transaction(trans); 773 774 if (ret == 1) 775 return len; 776 777 return -ENOSPC; 778 } 779 BTRFS_ATTR_W(space_info, force_chunk_alloc, btrfs_force_chunk_alloc_store); 780 781 #endif 782 783 SPACE_INFO_ATTR(flags); 784 SPACE_INFO_ATTR(total_bytes); 785 SPACE_INFO_ATTR(bytes_used); 786 SPACE_INFO_ATTR(bytes_pinned); 787 SPACE_INFO_ATTR(bytes_reserved); 788 SPACE_INFO_ATTR(bytes_may_use); 789 SPACE_INFO_ATTR(bytes_readonly); 790 SPACE_INFO_ATTR(bytes_zone_unusable); 791 SPACE_INFO_ATTR(disk_used); 792 SPACE_INFO_ATTR(disk_total); 793 SPACE_INFO_ATTR(reclaim_count); 794 SPACE_INFO_ATTR(reclaim_bytes); 795 SPACE_INFO_ATTR(reclaim_errors); 796 BTRFS_ATTR_RW(space_info, chunk_size, btrfs_chunk_size_show, btrfs_chunk_size_store); 797 BTRFS_ATTR(space_info, size_classes, btrfs_size_classes_show); 798 799 static ssize_t btrfs_sinfo_bg_reclaim_threshold_show(struct kobject *kobj, 800 struct kobj_attribute *a, 801 char *buf) 802 { 803 struct btrfs_space_info *space_info = to_space_info(kobj); 804 ssize_t ret; 805 806 spin_lock(&space_info->lock); 807 ret = sysfs_emit(buf, "%d\n", btrfs_calc_reclaim_threshold(space_info)); 808 spin_unlock(&space_info->lock); 809 return ret; 810 } 811 812 static ssize_t btrfs_sinfo_bg_reclaim_threshold_store(struct kobject *kobj, 813 struct kobj_attribute *a, 814 const char *buf, size_t len) 815 { 816 struct btrfs_space_info *space_info = to_space_info(kobj); 817 int thresh; 818 int ret; 819 820 if (READ_ONCE(space_info->dynamic_reclaim)) 821 return -EINVAL; 822 823 ret = kstrtoint(buf, 10, &thresh); 824 if (ret) 825 return ret; 826 827 if (thresh < 0 || thresh > 100) 828 return -EINVAL; 829 830 WRITE_ONCE(space_info->bg_reclaim_threshold, thresh); 831 832 return len; 833 } 834 835 BTRFS_ATTR_RW(space_info, bg_reclaim_threshold, 836 btrfs_sinfo_bg_reclaim_threshold_show, 837 btrfs_sinfo_bg_reclaim_threshold_store); 838 839 static ssize_t btrfs_sinfo_dynamic_reclaim_show(struct kobject *kobj, 840 struct kobj_attribute *a, 841 char *buf) 842 { 843 struct btrfs_space_info *space_info = to_space_info(kobj); 844 845 return sysfs_emit(buf, "%d\n", READ_ONCE(space_info->dynamic_reclaim)); 846 } 847 848 static ssize_t btrfs_sinfo_dynamic_reclaim_store(struct kobject *kobj, 849 struct kobj_attribute *a, 850 const char *buf, size_t len) 851 { 852 struct btrfs_space_info *space_info = to_space_info(kobj); 853 int dynamic_reclaim; 854 int ret; 855 856 ret = kstrtoint(buf, 10, &dynamic_reclaim); 857 if (ret) 858 return ret; 859 860 if (dynamic_reclaim < 0) 861 return -EINVAL; 862 863 WRITE_ONCE(space_info->dynamic_reclaim, dynamic_reclaim != 0); 864 865 return len; 866 } 867 868 BTRFS_ATTR_RW(space_info, dynamic_reclaim, 869 btrfs_sinfo_dynamic_reclaim_show, 870 btrfs_sinfo_dynamic_reclaim_store); 871 872 static ssize_t btrfs_sinfo_periodic_reclaim_show(struct kobject *kobj, 873 struct kobj_attribute *a, 874 char *buf) 875 { 876 struct btrfs_space_info *space_info = to_space_info(kobj); 877 878 return sysfs_emit(buf, "%d\n", READ_ONCE(space_info->periodic_reclaim)); 879 } 880 881 static ssize_t btrfs_sinfo_periodic_reclaim_store(struct kobject *kobj, 882 struct kobj_attribute *a, 883 const char *buf, size_t len) 884 { 885 struct btrfs_space_info *space_info = to_space_info(kobj); 886 int periodic_reclaim; 887 int ret; 888 889 ret = kstrtoint(buf, 10, &periodic_reclaim); 890 if (ret) 891 return ret; 892 893 if (periodic_reclaim < 0) 894 return -EINVAL; 895 896 WRITE_ONCE(space_info->periodic_reclaim, periodic_reclaim != 0); 897 898 return len; 899 } 900 901 BTRFS_ATTR_RW(space_info, periodic_reclaim, 902 btrfs_sinfo_periodic_reclaim_show, 903 btrfs_sinfo_periodic_reclaim_store); 904 905 /* 906 * Allocation information about block group types. 907 * 908 * Path: /sys/fs/btrfs/<uuid>/allocation/<bg-type>/ 909 */ 910 static struct attribute *space_info_attrs[] = { 911 BTRFS_ATTR_PTR(space_info, flags), 912 BTRFS_ATTR_PTR(space_info, total_bytes), 913 BTRFS_ATTR_PTR(space_info, bytes_used), 914 BTRFS_ATTR_PTR(space_info, bytes_pinned), 915 BTRFS_ATTR_PTR(space_info, bytes_reserved), 916 BTRFS_ATTR_PTR(space_info, bytes_may_use), 917 BTRFS_ATTR_PTR(space_info, bytes_readonly), 918 BTRFS_ATTR_PTR(space_info, bytes_zone_unusable), 919 BTRFS_ATTR_PTR(space_info, disk_used), 920 BTRFS_ATTR_PTR(space_info, disk_total), 921 BTRFS_ATTR_PTR(space_info, bg_reclaim_threshold), 922 BTRFS_ATTR_PTR(space_info, dynamic_reclaim), 923 BTRFS_ATTR_PTR(space_info, chunk_size), 924 BTRFS_ATTR_PTR(space_info, size_classes), 925 BTRFS_ATTR_PTR(space_info, reclaim_count), 926 BTRFS_ATTR_PTR(space_info, reclaim_bytes), 927 BTRFS_ATTR_PTR(space_info, reclaim_errors), 928 BTRFS_ATTR_PTR(space_info, periodic_reclaim), 929 #ifdef CONFIG_BTRFS_DEBUG 930 BTRFS_ATTR_PTR(space_info, force_chunk_alloc), 931 #endif 932 NULL, 933 }; 934 ATTRIBUTE_GROUPS(space_info); 935 936 static void space_info_release(struct kobject *kobj) 937 { 938 struct btrfs_space_info *sinfo = to_space_info(kobj); 939 kfree(sinfo); 940 } 941 942 static const struct kobj_type space_info_ktype = { 943 .sysfs_ops = &kobj_sysfs_ops, 944 .release = space_info_release, 945 .default_groups = space_info_groups, 946 }; 947 948 /* 949 * Allocation information about block groups. 950 * 951 * Path: /sys/fs/btrfs/<uuid>/allocation/ 952 */ 953 static const struct attribute *allocation_attrs[] = { 954 BTRFS_ATTR_PTR(allocation, global_rsv_reserved), 955 BTRFS_ATTR_PTR(allocation, global_rsv_size), 956 NULL, 957 }; 958 959 static ssize_t btrfs_label_show(struct kobject *kobj, 960 struct kobj_attribute *a, char *buf) 961 { 962 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 963 char *label = fs_info->super_copy->label; 964 ssize_t ret; 965 966 spin_lock(&fs_info->super_lock); 967 ret = sysfs_emit(buf, label[0] ? "%s\n" : "%s", label); 968 spin_unlock(&fs_info->super_lock); 969 970 return ret; 971 } 972 973 static ssize_t btrfs_label_store(struct kobject *kobj, 974 struct kobj_attribute *a, 975 const char *buf, size_t len) 976 { 977 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 978 size_t p_len; 979 980 if (!fs_info) 981 return -EPERM; 982 983 if (sb_rdonly(fs_info->sb)) 984 return -EROFS; 985 986 /* 987 * p_len is the len until the first occurrence of either 988 * '\n' or '\0' 989 */ 990 p_len = strcspn(buf, "\n"); 991 992 if (p_len >= BTRFS_LABEL_SIZE) 993 return -EINVAL; 994 995 spin_lock(&fs_info->super_lock); 996 memset(fs_info->super_copy->label, 0, BTRFS_LABEL_SIZE); 997 memcpy(fs_info->super_copy->label, buf, p_len); 998 spin_unlock(&fs_info->super_lock); 999 1000 /* 1001 * We don't want to do full transaction commit from inside sysfs 1002 */ 1003 set_bit(BTRFS_FS_NEED_TRANS_COMMIT, &fs_info->flags); 1004 wake_up_process(fs_info->transaction_kthread); 1005 1006 return len; 1007 } 1008 BTRFS_ATTR_RW(, label, btrfs_label_show, btrfs_label_store); 1009 1010 static ssize_t btrfs_nodesize_show(struct kobject *kobj, 1011 struct kobj_attribute *a, char *buf) 1012 { 1013 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 1014 1015 return sysfs_emit(buf, "%u\n", fs_info->nodesize); 1016 } 1017 1018 BTRFS_ATTR(, nodesize, btrfs_nodesize_show); 1019 1020 static ssize_t btrfs_sectorsize_show(struct kobject *kobj, 1021 struct kobj_attribute *a, char *buf) 1022 { 1023 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 1024 1025 return sysfs_emit(buf, "%u\n", fs_info->sectorsize); 1026 } 1027 1028 BTRFS_ATTR(, sectorsize, btrfs_sectorsize_show); 1029 1030 static ssize_t btrfs_commit_stats_show(struct kobject *kobj, 1031 struct kobj_attribute *a, char *buf) 1032 { 1033 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 1034 u64 now = ktime_get_ns(); 1035 u64 start_time = fs_info->commit_stats.critical_section_start_time; 1036 u64 pending = 0; 1037 1038 if (start_time) 1039 pending = now - start_time; 1040 1041 return sysfs_emit(buf, 1042 "commits %llu\n" 1043 "cur_commit_ms %llu\n" 1044 "last_commit_ms %llu\n" 1045 "max_commit_ms %llu\n" 1046 "total_commit_ms %llu\n", 1047 fs_info->commit_stats.commit_count, 1048 div_u64(pending, NSEC_PER_MSEC), 1049 div_u64(fs_info->commit_stats.last_commit_dur, NSEC_PER_MSEC), 1050 div_u64(fs_info->commit_stats.max_commit_dur, NSEC_PER_MSEC), 1051 div_u64(fs_info->commit_stats.total_commit_dur, NSEC_PER_MSEC)); 1052 } 1053 1054 static ssize_t btrfs_commit_stats_store(struct kobject *kobj, 1055 struct kobj_attribute *a, 1056 const char *buf, size_t len) 1057 { 1058 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 1059 unsigned long val; 1060 int ret; 1061 1062 if (!fs_info) 1063 return -EPERM; 1064 1065 if (!capable(CAP_SYS_RESOURCE)) 1066 return -EPERM; 1067 1068 ret = kstrtoul(buf, 10, &val); 1069 if (ret) 1070 return ret; 1071 if (val) 1072 return -EINVAL; 1073 1074 WRITE_ONCE(fs_info->commit_stats.max_commit_dur, 0); 1075 1076 return len; 1077 } 1078 BTRFS_ATTR_RW(, commit_stats, btrfs_commit_stats_show, btrfs_commit_stats_store); 1079 1080 static ssize_t btrfs_clone_alignment_show(struct kobject *kobj, 1081 struct kobj_attribute *a, char *buf) 1082 { 1083 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 1084 1085 return sysfs_emit(buf, "%u\n", fs_info->sectorsize); 1086 } 1087 1088 BTRFS_ATTR(, clone_alignment, btrfs_clone_alignment_show); 1089 1090 static ssize_t quota_override_show(struct kobject *kobj, 1091 struct kobj_attribute *a, char *buf) 1092 { 1093 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 1094 int quota_override; 1095 1096 quota_override = test_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags); 1097 return sysfs_emit(buf, "%d\n", quota_override); 1098 } 1099 1100 static ssize_t quota_override_store(struct kobject *kobj, 1101 struct kobj_attribute *a, 1102 const char *buf, size_t len) 1103 { 1104 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 1105 unsigned long knob; 1106 int ret; 1107 1108 if (!fs_info) 1109 return -EPERM; 1110 1111 if (!capable(CAP_SYS_RESOURCE)) 1112 return -EPERM; 1113 1114 ret = kstrtoul(buf, 10, &knob); 1115 if (ret) 1116 return ret; 1117 if (knob > 1) 1118 return -EINVAL; 1119 1120 assign_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags, knob); 1121 1122 return len; 1123 } 1124 1125 BTRFS_ATTR_RW(, quota_override, quota_override_show, quota_override_store); 1126 1127 static ssize_t btrfs_metadata_uuid_show(struct kobject *kobj, 1128 struct kobj_attribute *a, char *buf) 1129 { 1130 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 1131 1132 return sysfs_emit(buf, "%pU\n", fs_info->fs_devices->metadata_uuid); 1133 } 1134 1135 BTRFS_ATTR(, metadata_uuid, btrfs_metadata_uuid_show); 1136 1137 static ssize_t btrfs_checksum_show(struct kobject *kobj, 1138 struct kobj_attribute *a, char *buf) 1139 { 1140 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 1141 u16 csum_type = btrfs_super_csum_type(fs_info->super_copy); 1142 const char *csum_name = btrfs_super_csum_name(csum_type); 1143 1144 return sysfs_emit(buf, "%s (%s-lib)\n", csum_name, csum_name); 1145 } 1146 1147 BTRFS_ATTR(, checksum, btrfs_checksum_show); 1148 1149 static ssize_t btrfs_exclusive_operation_show(struct kobject *kobj, 1150 struct kobj_attribute *a, char *buf) 1151 { 1152 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 1153 const char *str; 1154 1155 switch (READ_ONCE(fs_info->exclusive_operation)) { 1156 case BTRFS_EXCLOP_NONE: 1157 str = "none\n"; 1158 break; 1159 case BTRFS_EXCLOP_BALANCE: 1160 str = "balance\n"; 1161 break; 1162 case BTRFS_EXCLOP_BALANCE_PAUSED: 1163 str = "balance paused\n"; 1164 break; 1165 case BTRFS_EXCLOP_DEV_ADD: 1166 str = "device add\n"; 1167 break; 1168 case BTRFS_EXCLOP_DEV_REMOVE: 1169 str = "device remove\n"; 1170 break; 1171 case BTRFS_EXCLOP_DEV_REPLACE: 1172 str = "device replace\n"; 1173 break; 1174 case BTRFS_EXCLOP_RESIZE: 1175 str = "resize\n"; 1176 break; 1177 case BTRFS_EXCLOP_SWAP_ACTIVATE: 1178 str = "swap activate\n"; 1179 break; 1180 default: 1181 str = "UNKNOWN\n"; 1182 break; 1183 } 1184 return sysfs_emit(buf, "%s", str); 1185 } 1186 BTRFS_ATTR(, exclusive_operation, btrfs_exclusive_operation_show); 1187 1188 static ssize_t btrfs_generation_show(struct kobject *kobj, 1189 struct kobj_attribute *a, char *buf) 1190 { 1191 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 1192 1193 return sysfs_emit(buf, "%llu\n", btrfs_get_fs_generation(fs_info)); 1194 } 1195 BTRFS_ATTR(, generation, btrfs_generation_show); 1196 1197 static ssize_t btrfs_temp_fsid_show(struct kobject *kobj, 1198 struct kobj_attribute *a, char *buf) 1199 { 1200 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 1201 1202 return sysfs_emit(buf, "%d\n", fs_info->fs_devices->temp_fsid); 1203 } 1204 BTRFS_ATTR(, temp_fsid, btrfs_temp_fsid_show); 1205 1206 static const char *btrfs_read_policy_name[] = { 1207 "pid", 1208 #ifdef CONFIG_BTRFS_EXPERIMENTAL 1209 "round-robin", 1210 "devid", 1211 #endif 1212 }; 1213 1214 #ifdef CONFIG_BTRFS_EXPERIMENTAL 1215 1216 /* Global module configuration parameters. */ 1217 static char *read_policy; 1218 char *btrfs_get_mod_read_policy(void) 1219 { 1220 return read_policy; 1221 } 1222 1223 /* Set perms to 0, disable /sys/module/btrfs/parameters/read_policy interface. */ 1224 module_param(read_policy, charp, 0); 1225 MODULE_PARM_DESC(read_policy, 1226 "Global read policy: pid (default), round-robin[:<min_contig_read>], devid[:<devid>]"); 1227 #endif 1228 1229 int btrfs_read_policy_to_enum(const char *str, s64 *value_ret) 1230 { 1231 char param[32]; 1232 char __maybe_unused *value_str; 1233 1234 if (!str || strlen(str) == 0) 1235 return 0; 1236 1237 strscpy(param, str); 1238 1239 #ifdef CONFIG_BTRFS_EXPERIMENTAL 1240 /* Separate value from input in policy:value format. */ 1241 value_str = strchr(param, ':'); 1242 if (value_str) { 1243 char *retptr; 1244 1245 *value_str = 0; 1246 value_str++; 1247 if (!value_ret) 1248 return -EINVAL; 1249 1250 *value_ret = memparse(value_str, &retptr); 1251 /* There could be any trailing typos after the value. */ 1252 retptr = skip_spaces(retptr); 1253 if (*retptr != 0 || *value_ret <= 0) 1254 return -EINVAL; 1255 } 1256 #endif 1257 1258 return sysfs_match_string(btrfs_read_policy_name, param); 1259 } 1260 1261 #ifdef CONFIG_BTRFS_EXPERIMENTAL 1262 int __init btrfs_read_policy_init(void) 1263 { 1264 s64 value; 1265 1266 if (btrfs_read_policy_to_enum(read_policy, &value) == -EINVAL) { 1267 btrfs_err(NULL, "invalid read policy or value %s", read_policy); 1268 return -EINVAL; 1269 } 1270 1271 return 0; 1272 } 1273 #endif 1274 1275 static ssize_t btrfs_read_policy_show(struct kobject *kobj, 1276 struct kobj_attribute *a, char *buf) 1277 { 1278 struct btrfs_fs_devices *fs_devices = to_fs_devs(kobj); 1279 const enum btrfs_read_policy policy = READ_ONCE(fs_devices->read_policy); 1280 ssize_t ret = 0; 1281 int i; 1282 1283 for (i = 0; i < BTRFS_NR_READ_POLICY; i++) { 1284 if (ret != 0) 1285 ret += sysfs_emit_at(buf, ret, " "); 1286 1287 if (i == policy) 1288 ret += sysfs_emit_at(buf, ret, "["); 1289 1290 ret += sysfs_emit_at(buf, ret, "%s", btrfs_read_policy_name[i]); 1291 1292 #ifdef CONFIG_BTRFS_EXPERIMENTAL 1293 if (i == BTRFS_READ_POLICY_RR) 1294 ret += sysfs_emit_at(buf, ret, ":%u", 1295 READ_ONCE(fs_devices->rr_min_contig_read)); 1296 1297 if (i == BTRFS_READ_POLICY_DEVID) 1298 ret += sysfs_emit_at(buf, ret, ":%llu", 1299 READ_ONCE(fs_devices->read_devid)); 1300 #endif 1301 if (i == policy) 1302 ret += sysfs_emit_at(buf, ret, "]"); 1303 } 1304 1305 ret += sysfs_emit_at(buf, ret, "\n"); 1306 1307 return ret; 1308 } 1309 1310 static ssize_t btrfs_read_policy_store(struct kobject *kobj, 1311 struct kobj_attribute *a, 1312 const char *buf, size_t len) 1313 { 1314 struct btrfs_fs_devices *fs_devices = to_fs_devs(kobj); 1315 int index; 1316 s64 value = -1; 1317 1318 index = btrfs_read_policy_to_enum(buf, &value); 1319 if (index < 0) 1320 return -EINVAL; 1321 1322 #ifdef CONFIG_BTRFS_EXPERIMENTAL 1323 /* If moving from RR then disable collecting fs stats. */ 1324 if (fs_devices->read_policy == BTRFS_READ_POLICY_RR && index != BTRFS_READ_POLICY_RR) 1325 fs_devices->collect_fs_stats = false; 1326 1327 if (index == BTRFS_READ_POLICY_RR) { 1328 if (value != -1) { 1329 const u32 sectorsize = fs_devices->fs_info->sectorsize; 1330 1331 if (!IS_ALIGNED(value, sectorsize)) { 1332 u64 temp_value = round_up(value, sectorsize); 1333 1334 btrfs_debug(fs_devices->fs_info, 1335 "read_policy: min contig read %lld should be multiple of sectorsize %u, rounded to %llu", 1336 value, sectorsize, temp_value); 1337 value = temp_value; 1338 } 1339 } else { 1340 value = BTRFS_DEFAULT_RR_MIN_CONTIG_READ; 1341 } 1342 1343 if (index != READ_ONCE(fs_devices->read_policy) || 1344 value != READ_ONCE(fs_devices->rr_min_contig_read)) { 1345 WRITE_ONCE(fs_devices->read_policy, index); 1346 WRITE_ONCE(fs_devices->rr_min_contig_read, value); 1347 1348 btrfs_info(fs_devices->fs_info, "read policy set to '%s:%lld'", 1349 btrfs_read_policy_name[index], value); 1350 } 1351 1352 fs_devices->collect_fs_stats = true; 1353 1354 return len; 1355 } 1356 1357 if (index == BTRFS_READ_POLICY_DEVID) { 1358 if (value != -1) { 1359 BTRFS_DEV_LOOKUP_ARGS(args); 1360 1361 /* Validate input devid. */ 1362 args.devid = value; 1363 if (btrfs_find_device(fs_devices, &args) == NULL) 1364 return -EINVAL; 1365 } else { 1366 /* Set default devid to the devid of the latest device. */ 1367 value = fs_devices->latest_dev->devid; 1368 } 1369 1370 if (index != READ_ONCE(fs_devices->read_policy) || 1371 value != READ_ONCE(fs_devices->read_devid)) { 1372 WRITE_ONCE(fs_devices->read_policy, index); 1373 WRITE_ONCE(fs_devices->read_devid, value); 1374 1375 btrfs_info(fs_devices->fs_info, "read policy set to '%s:%llu'", 1376 btrfs_read_policy_name[index], value); 1377 } 1378 1379 return len; 1380 } 1381 #endif 1382 if (index != READ_ONCE(fs_devices->read_policy)) { 1383 WRITE_ONCE(fs_devices->read_policy, index); 1384 btrfs_info(fs_devices->fs_info, "read policy set to '%s'", 1385 btrfs_read_policy_name[index]); 1386 } 1387 1388 return len; 1389 } 1390 BTRFS_ATTR_RW(, read_policy, btrfs_read_policy_show, btrfs_read_policy_store); 1391 1392 static ssize_t btrfs_bg_reclaim_threshold_show(struct kobject *kobj, 1393 struct kobj_attribute *a, 1394 char *buf) 1395 { 1396 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 1397 1398 return sysfs_emit(buf, "%d\n", READ_ONCE(fs_info->bg_reclaim_threshold)); 1399 } 1400 1401 static ssize_t btrfs_bg_reclaim_threshold_store(struct kobject *kobj, 1402 struct kobj_attribute *a, 1403 const char *buf, size_t len) 1404 { 1405 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 1406 int thresh; 1407 int ret; 1408 1409 ret = kstrtoint(buf, 10, &thresh); 1410 if (ret) 1411 return ret; 1412 1413 #ifdef CONFIG_BTRFS_DEBUG 1414 if (thresh != 0 && (thresh > 100)) 1415 return -EINVAL; 1416 #else 1417 if (thresh != 0 && (thresh <= 50 || thresh > 100)) 1418 return -EINVAL; 1419 #endif 1420 1421 WRITE_ONCE(fs_info->bg_reclaim_threshold, thresh); 1422 1423 return len; 1424 } 1425 BTRFS_ATTR_RW(, bg_reclaim_threshold, btrfs_bg_reclaim_threshold_show, 1426 btrfs_bg_reclaim_threshold_store); 1427 1428 /* 1429 * Per-filesystem information and stats. 1430 * 1431 * Path: /sys/fs/btrfs/<uuid>/ 1432 */ 1433 static const struct attribute *btrfs_attrs[] = { 1434 BTRFS_ATTR_PTR(, label), 1435 BTRFS_ATTR_PTR(, nodesize), 1436 BTRFS_ATTR_PTR(, sectorsize), 1437 BTRFS_ATTR_PTR(, clone_alignment), 1438 BTRFS_ATTR_PTR(, quota_override), 1439 BTRFS_ATTR_PTR(, metadata_uuid), 1440 BTRFS_ATTR_PTR(, checksum), 1441 BTRFS_ATTR_PTR(, exclusive_operation), 1442 BTRFS_ATTR_PTR(, generation), 1443 BTRFS_ATTR_PTR(, read_policy), 1444 BTRFS_ATTR_PTR(, bg_reclaim_threshold), 1445 BTRFS_ATTR_PTR(, commit_stats), 1446 BTRFS_ATTR_PTR(, temp_fsid), 1447 NULL, 1448 }; 1449 1450 static void btrfs_release_fsid_kobj(struct kobject *kobj) 1451 { 1452 struct btrfs_fs_devices *fs_devs = to_fs_devs(kobj); 1453 1454 memset(&fs_devs->fsid_kobj, 0, sizeof(struct kobject)); 1455 complete(&fs_devs->kobj_unregister); 1456 } 1457 1458 static const struct kobj_type btrfs_ktype = { 1459 .sysfs_ops = &kobj_sysfs_ops, 1460 .release = btrfs_release_fsid_kobj, 1461 }; 1462 1463 static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj) 1464 { 1465 if (kobj->ktype != &btrfs_ktype) 1466 return NULL; 1467 return container_of(kobj, struct btrfs_fs_devices, fsid_kobj); 1468 } 1469 1470 static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj) 1471 { 1472 if (kobj->ktype != &btrfs_ktype) 1473 return NULL; 1474 return to_fs_devs(kobj)->fs_info; 1475 } 1476 1477 static struct kobject *get_btrfs_kobj(struct kobject *kobj) 1478 { 1479 while (kobj) { 1480 if (kobj->ktype == &btrfs_ktype) 1481 return kobj; 1482 kobj = kobj->parent; 1483 } 1484 return NULL; 1485 } 1486 1487 #define NUM_FEATURE_BITS 64 1488 #define BTRFS_FEATURE_NAME_MAX 13 1489 static char btrfs_unknown_feature_names[FEAT_MAX][NUM_FEATURE_BITS][BTRFS_FEATURE_NAME_MAX]; 1490 static struct btrfs_feature_attr btrfs_feature_attrs[FEAT_MAX][NUM_FEATURE_BITS]; 1491 1492 static_assert(ARRAY_SIZE(btrfs_unknown_feature_names) == 1493 ARRAY_SIZE(btrfs_feature_attrs)); 1494 static_assert(ARRAY_SIZE(btrfs_unknown_feature_names[0]) == 1495 ARRAY_SIZE(btrfs_feature_attrs[0])); 1496 1497 static const u64 supported_feature_masks[FEAT_MAX] = { 1498 [FEAT_COMPAT] = BTRFS_FEATURE_COMPAT_SUPP, 1499 [FEAT_COMPAT_RO] = BTRFS_FEATURE_COMPAT_RO_SUPP, 1500 [FEAT_INCOMPAT] = BTRFS_FEATURE_INCOMPAT_SUPP, 1501 }; 1502 1503 static int addrm_unknown_feature_attrs(struct btrfs_fs_info *fs_info, bool add) 1504 { 1505 int set; 1506 1507 for (set = 0; set < FEAT_MAX; set++) { 1508 int i; 1509 struct attribute *attrs[2]; 1510 struct attribute_group agroup = { 1511 .name = "features", 1512 .attrs = attrs, 1513 }; 1514 u64 features = get_features(fs_info, set); 1515 features &= ~supported_feature_masks[set]; 1516 1517 if (!features) 1518 continue; 1519 1520 attrs[1] = NULL; 1521 for (i = 0; i < NUM_FEATURE_BITS; i++) { 1522 struct btrfs_feature_attr *fa; 1523 1524 if (!(features & (1ULL << i))) 1525 continue; 1526 1527 fa = &btrfs_feature_attrs[set][i]; 1528 attrs[0] = &fa->kobj_attr.attr; 1529 if (add) { 1530 int ret; 1531 ret = sysfs_merge_group(&fs_info->fs_devices->fsid_kobj, 1532 &agroup); 1533 if (ret) 1534 return ret; 1535 } else 1536 sysfs_unmerge_group(&fs_info->fs_devices->fsid_kobj, 1537 &agroup); 1538 } 1539 1540 } 1541 return 0; 1542 } 1543 1544 static void __btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs) 1545 { 1546 if (fs_devs->devinfo_kobj) { 1547 kobject_del(fs_devs->devinfo_kobj); 1548 kobject_put(fs_devs->devinfo_kobj); 1549 fs_devs->devinfo_kobj = NULL; 1550 } 1551 1552 if (fs_devs->devices_kobj) { 1553 kobject_del(fs_devs->devices_kobj); 1554 kobject_put(fs_devs->devices_kobj); 1555 fs_devs->devices_kobj = NULL; 1556 } 1557 1558 if (fs_devs->fsid_kobj.state_initialized) { 1559 kobject_del(&fs_devs->fsid_kobj); 1560 kobject_put(&fs_devs->fsid_kobj); 1561 wait_for_completion(&fs_devs->kobj_unregister); 1562 } 1563 } 1564 1565 /* when fs_devs is NULL it will remove all fsid kobject */ 1566 void btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs) 1567 { 1568 struct list_head *fs_uuids = btrfs_get_fs_uuids(); 1569 1570 if (fs_devs) { 1571 __btrfs_sysfs_remove_fsid(fs_devs); 1572 return; 1573 } 1574 1575 list_for_each_entry(fs_devs, fs_uuids, fs_list) { 1576 __btrfs_sysfs_remove_fsid(fs_devs); 1577 } 1578 } 1579 1580 static void btrfs_sysfs_remove_fs_devices(struct btrfs_fs_devices *fs_devices) 1581 { 1582 struct btrfs_device *device; 1583 struct btrfs_fs_devices *seed; 1584 1585 list_for_each_entry(device, &fs_devices->devices, dev_list) 1586 btrfs_sysfs_remove_device(device); 1587 1588 list_for_each_entry(seed, &fs_devices->seed_list, seed_list) { 1589 list_for_each_entry(device, &seed->devices, dev_list) 1590 btrfs_sysfs_remove_device(device); 1591 } 1592 } 1593 1594 void btrfs_sysfs_remove_mounted(struct btrfs_fs_info *fs_info) 1595 { 1596 struct kobject *fsid_kobj = &fs_info->fs_devices->fsid_kobj; 1597 1598 sysfs_remove_link(fsid_kobj, "bdi"); 1599 1600 if (fs_info->space_info_kobj) { 1601 sysfs_remove_files(fs_info->space_info_kobj, allocation_attrs); 1602 kobject_del(fs_info->space_info_kobj); 1603 kobject_put(fs_info->space_info_kobj); 1604 } 1605 if (fs_info->discard_kobj) { 1606 sysfs_remove_files(fs_info->discard_kobj, discard_attrs); 1607 kobject_del(fs_info->discard_kobj); 1608 kobject_put(fs_info->discard_kobj); 1609 } 1610 #ifdef CONFIG_BTRFS_DEBUG 1611 if (fs_info->debug_kobj) { 1612 sysfs_remove_files(fs_info->debug_kobj, btrfs_debug_mount_attrs); 1613 kobject_del(fs_info->debug_kobj); 1614 kobject_put(fs_info->debug_kobj); 1615 } 1616 #endif 1617 addrm_unknown_feature_attrs(fs_info, false); 1618 sysfs_remove_group(fsid_kobj, &btrfs_feature_attr_group); 1619 sysfs_remove_files(fsid_kobj, btrfs_attrs); 1620 btrfs_sysfs_remove_fs_devices(fs_info->fs_devices); 1621 } 1622 1623 static const char * const btrfs_feature_set_names[FEAT_MAX] = { 1624 [FEAT_COMPAT] = "compat", 1625 [FEAT_COMPAT_RO] = "compat_ro", 1626 [FEAT_INCOMPAT] = "incompat", 1627 }; 1628 1629 const char *btrfs_feature_set_name(enum btrfs_feature_set set) 1630 { 1631 return btrfs_feature_set_names[set]; 1632 } 1633 1634 char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags) 1635 { 1636 size_t bufsize = 4096; /* safe max, 64 names * 64 bytes */ 1637 int len = 0; 1638 int i; 1639 char *str; 1640 1641 str = kmalloc(bufsize, GFP_KERNEL); 1642 if (!str) 1643 return str; 1644 1645 for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { 1646 const char *name; 1647 1648 if (!(flags & (1ULL << i))) 1649 continue; 1650 1651 name = btrfs_feature_attrs[set][i].kobj_attr.attr.name; 1652 len += scnprintf(str + len, bufsize - len, "%s%s", 1653 len ? "," : "", name); 1654 } 1655 1656 return str; 1657 } 1658 1659 static void init_feature_attrs(void) 1660 { 1661 struct btrfs_feature_attr *fa; 1662 int set, i; 1663 1664 memset(btrfs_feature_attrs, 0, sizeof(btrfs_feature_attrs)); 1665 memset(btrfs_unknown_feature_names, 0, 1666 sizeof(btrfs_unknown_feature_names)); 1667 1668 for (i = 0; btrfs_supported_feature_attrs[i]; i++) { 1669 struct btrfs_feature_attr *sfa; 1670 struct attribute *a = btrfs_supported_feature_attrs[i]; 1671 int bit; 1672 sfa = attr_to_btrfs_feature_attr(a); 1673 bit = ilog2(sfa->feature_bit); 1674 fa = &btrfs_feature_attrs[sfa->feature_set][bit]; 1675 1676 fa->kobj_attr.attr.name = sfa->kobj_attr.attr.name; 1677 } 1678 1679 for (set = 0; set < FEAT_MAX; set++) { 1680 for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { 1681 char *name = btrfs_unknown_feature_names[set][i]; 1682 fa = &btrfs_feature_attrs[set][i]; 1683 1684 if (fa->kobj_attr.attr.name) 1685 continue; 1686 1687 snprintf(name, BTRFS_FEATURE_NAME_MAX, "%s:%u", 1688 btrfs_feature_set_names[set], i); 1689 1690 fa->kobj_attr.attr.name = name; 1691 fa->kobj_attr.attr.mode = S_IRUGO; 1692 fa->feature_set = set; 1693 fa->feature_bit = 1ULL << i; 1694 } 1695 } 1696 } 1697 1698 /* 1699 * Create a sysfs entry for a given block group type at path 1700 * /sys/fs/btrfs/UUID/allocation/data/TYPE 1701 */ 1702 void btrfs_sysfs_add_block_group_type(struct btrfs_block_group *cache) 1703 { 1704 struct btrfs_fs_info *fs_info = cache->fs_info; 1705 struct btrfs_space_info *space_info = cache->space_info; 1706 struct raid_kobject *rkobj; 1707 const int index = btrfs_bg_flags_to_raid_index(cache->flags); 1708 unsigned int nofs_flag; 1709 int ret; 1710 1711 /* 1712 * Setup a NOFS context because kobject_add(), deep in its call chain, 1713 * does GFP_KERNEL allocations, and we are often called in a context 1714 * where if reclaim is triggered we can deadlock (we are either holding 1715 * a transaction handle or some lock required for a transaction 1716 * commit). 1717 */ 1718 nofs_flag = memalloc_nofs_save(); 1719 1720 rkobj = kzalloc_obj(*rkobj, GFP_NOFS); 1721 if (!rkobj) { 1722 memalloc_nofs_restore(nofs_flag); 1723 btrfs_warn(cache->fs_info, 1724 "couldn't alloc memory for raid level kobject"); 1725 return; 1726 } 1727 1728 rkobj->flags = cache->flags; 1729 kobject_init(&rkobj->kobj, &btrfs_raid_ktype); 1730 1731 /* 1732 * We call this either on mount, or if we've created a block group for a 1733 * new index type while running (i.e. when restriping). The running 1734 * case is tricky because we could race with other threads, so we need 1735 * to have this check to make sure we didn't already init the kobject. 1736 * 1737 * We don't have to protect on the free side because it only happens on 1738 * unmount. 1739 */ 1740 spin_lock(&space_info->lock); 1741 if (space_info->block_group_kobjs[index]) { 1742 spin_unlock(&space_info->lock); 1743 kobject_put(&rkobj->kobj); 1744 return; 1745 } else { 1746 space_info->block_group_kobjs[index] = &rkobj->kobj; 1747 } 1748 spin_unlock(&space_info->lock); 1749 1750 ret = kobject_add(&rkobj->kobj, &space_info->kobj, "%s", 1751 btrfs_bg_type_to_raid_name(rkobj->flags)); 1752 memalloc_nofs_restore(nofs_flag); 1753 if (ret) { 1754 spin_lock(&space_info->lock); 1755 space_info->block_group_kobjs[index] = NULL; 1756 spin_unlock(&space_info->lock); 1757 kobject_put(&rkobj->kobj); 1758 btrfs_warn(fs_info, 1759 "failed to add kobject for block cache, ignoring"); 1760 return; 1761 } 1762 } 1763 1764 /* 1765 * Remove sysfs directories for all block group types of a given space info and 1766 * the space info as well 1767 */ 1768 void btrfs_sysfs_remove_space_info(struct btrfs_space_info *space_info) 1769 { 1770 int i; 1771 1772 for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) { 1773 struct kobject *kobj; 1774 1775 kobj = space_info->block_group_kobjs[i]; 1776 space_info->block_group_kobjs[i] = NULL; 1777 if (kobj) { 1778 kobject_del(kobj); 1779 kobject_put(kobj); 1780 } 1781 } 1782 kobject_del(&space_info->kobj); 1783 kobject_put(&space_info->kobj); 1784 } 1785 1786 static const char *alloc_name(struct btrfs_space_info *space_info) 1787 { 1788 u64 flags = space_info->flags; 1789 1790 switch (flags) { 1791 case BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_DATA: 1792 return "mixed"; 1793 case BTRFS_BLOCK_GROUP_METADATA: 1794 switch (space_info->subgroup_id) { 1795 case BTRFS_SUB_GROUP_PRIMARY: 1796 return "metadata"; 1797 case BTRFS_SUB_GROUP_TREELOG: 1798 return "metadata-treelog"; 1799 default: 1800 WARN_ON_ONCE(1); 1801 return "metadata (unknown sub-group)"; 1802 } 1803 case BTRFS_BLOCK_GROUP_DATA: 1804 switch (space_info->subgroup_id) { 1805 case BTRFS_SUB_GROUP_PRIMARY: 1806 return "data"; 1807 case BTRFS_SUB_GROUP_DATA_RELOC: 1808 return "data-reloc"; 1809 default: 1810 WARN_ON_ONCE(1); 1811 return "data (unknown sub-group)"; 1812 } 1813 case BTRFS_BLOCK_GROUP_SYSTEM: 1814 ASSERT(space_info->subgroup_id == BTRFS_SUB_GROUP_PRIMARY); 1815 return "system"; 1816 case BTRFS_BLOCK_GROUP_METADATA_REMAP: 1817 return "metadata-remap"; 1818 default: 1819 WARN_ON(1); 1820 return "invalid-combination"; 1821 } 1822 } 1823 1824 /* 1825 * Create a sysfs entry for a space info type at path 1826 * /sys/fs/btrfs/UUID/allocation/TYPE 1827 */ 1828 int btrfs_sysfs_add_space_info_type(struct btrfs_space_info *space_info) 1829 { 1830 int ret; 1831 1832 ret = kobject_init_and_add(&space_info->kobj, &space_info_ktype, 1833 space_info->fs_info->space_info_kobj, "%s", 1834 alloc_name(space_info)); 1835 if (ret) { 1836 kobject_put(&space_info->kobj); 1837 return ret; 1838 } 1839 1840 return 0; 1841 } 1842 1843 void btrfs_sysfs_remove_device(struct btrfs_device *device) 1844 { 1845 struct kobject *devices_kobj; 1846 1847 /* 1848 * Seed fs_devices devices_kobj aren't used, fetch kobject from the 1849 * fs_info::fs_devices. 1850 */ 1851 devices_kobj = device->fs_info->fs_devices->devices_kobj; 1852 ASSERT(devices_kobj); 1853 1854 if (device->bdev) 1855 sysfs_remove_link(devices_kobj, bdev_kobj(device->bdev)->name); 1856 1857 if (device->devid_kobj.state_initialized) { 1858 kobject_del(&device->devid_kobj); 1859 kobject_put(&device->devid_kobj); 1860 wait_for_completion(&device->kobj_unregister); 1861 } 1862 } 1863 1864 static ssize_t btrfs_devinfo_in_fs_metadata_show(struct kobject *kobj, 1865 struct kobj_attribute *a, 1866 char *buf) 1867 { 1868 int val; 1869 struct btrfs_device *device = container_of(kobj, struct btrfs_device, 1870 devid_kobj); 1871 1872 val = !!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &device->dev_state); 1873 1874 return sysfs_emit(buf, "%d\n", val); 1875 } 1876 BTRFS_ATTR(devid, in_fs_metadata, btrfs_devinfo_in_fs_metadata_show); 1877 1878 static ssize_t btrfs_devinfo_missing_show(struct kobject *kobj, 1879 struct kobj_attribute *a, char *buf) 1880 { 1881 int val; 1882 struct btrfs_device *device = container_of(kobj, struct btrfs_device, 1883 devid_kobj); 1884 1885 val = !!test_bit(BTRFS_DEV_STATE_MISSING, &device->dev_state); 1886 1887 return sysfs_emit(buf, "%d\n", val); 1888 } 1889 BTRFS_ATTR(devid, missing, btrfs_devinfo_missing_show); 1890 1891 static ssize_t btrfs_devinfo_replace_target_show(struct kobject *kobj, 1892 struct kobj_attribute *a, 1893 char *buf) 1894 { 1895 int val; 1896 struct btrfs_device *device = container_of(kobj, struct btrfs_device, 1897 devid_kobj); 1898 1899 val = !!test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state); 1900 1901 return sysfs_emit(buf, "%d\n", val); 1902 } 1903 BTRFS_ATTR(devid, replace_target, btrfs_devinfo_replace_target_show); 1904 1905 static ssize_t btrfs_devinfo_scrub_speed_max_show(struct kobject *kobj, 1906 struct kobj_attribute *a, 1907 char *buf) 1908 { 1909 struct btrfs_device *device = container_of(kobj, struct btrfs_device, 1910 devid_kobj); 1911 1912 return sysfs_emit(buf, "%llu\n", READ_ONCE(device->scrub_speed_max)); 1913 } 1914 1915 static ssize_t btrfs_devinfo_scrub_speed_max_store(struct kobject *kobj, 1916 struct kobj_attribute *a, 1917 const char *buf, size_t len) 1918 { 1919 struct btrfs_device *device = container_of(kobj, struct btrfs_device, 1920 devid_kobj); 1921 char *endptr; 1922 unsigned long long limit; 1923 1924 limit = memparse(buf, &endptr); 1925 /* There could be trailing '\n', also catch any typos after the value. */ 1926 endptr = skip_spaces(endptr); 1927 if (*endptr != 0) 1928 return -EINVAL; 1929 WRITE_ONCE(device->scrub_speed_max, limit); 1930 return len; 1931 } 1932 BTRFS_ATTR_RW(devid, scrub_speed_max, btrfs_devinfo_scrub_speed_max_show, 1933 btrfs_devinfo_scrub_speed_max_store); 1934 1935 static ssize_t btrfs_devinfo_writeable_show(struct kobject *kobj, 1936 struct kobj_attribute *a, char *buf) 1937 { 1938 int val; 1939 struct btrfs_device *device = container_of(kobj, struct btrfs_device, 1940 devid_kobj); 1941 1942 val = !!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state); 1943 1944 return sysfs_emit(buf, "%d\n", val); 1945 } 1946 BTRFS_ATTR(devid, writeable, btrfs_devinfo_writeable_show); 1947 1948 static ssize_t btrfs_devinfo_fsid_show(struct kobject *kobj, 1949 struct kobj_attribute *a, char *buf) 1950 { 1951 struct btrfs_device *device = container_of(kobj, struct btrfs_device, 1952 devid_kobj); 1953 1954 return sysfs_emit(buf, "%pU\n", device->fs_devices->fsid); 1955 } 1956 BTRFS_ATTR(devid, fsid, btrfs_devinfo_fsid_show); 1957 1958 static ssize_t btrfs_devinfo_error_stats_show(struct kobject *kobj, 1959 struct kobj_attribute *a, char *buf) 1960 { 1961 struct btrfs_device *device = container_of(kobj, struct btrfs_device, 1962 devid_kobj); 1963 1964 if (!device->dev_stats_valid) 1965 return sysfs_emit(buf, "invalid\n"); 1966 1967 /* 1968 * Print all at once so we get a snapshot of all values from the same 1969 * time. Keep them in sync and in order of definition of 1970 * btrfs_dev_stat_values. 1971 */ 1972 return sysfs_emit(buf, 1973 "write_errs %d\n" 1974 "read_errs %d\n" 1975 "flush_errs %d\n" 1976 "corruption_errs %d\n" 1977 "generation_errs %d\n", 1978 btrfs_dev_stat_read(device, BTRFS_DEV_STAT_WRITE_ERRS), 1979 btrfs_dev_stat_read(device, BTRFS_DEV_STAT_READ_ERRS), 1980 btrfs_dev_stat_read(device, BTRFS_DEV_STAT_FLUSH_ERRS), 1981 btrfs_dev_stat_read(device, BTRFS_DEV_STAT_CORRUPTION_ERRS), 1982 btrfs_dev_stat_read(device, BTRFS_DEV_STAT_GENERATION_ERRS)); 1983 } 1984 BTRFS_ATTR(devid, error_stats, btrfs_devinfo_error_stats_show); 1985 1986 /* 1987 * Information about one device. 1988 * 1989 * Path: /sys/fs/btrfs/<uuid>/devinfo/<devid>/ 1990 */ 1991 static struct attribute *devid_attrs[] = { 1992 BTRFS_ATTR_PTR(devid, error_stats), 1993 BTRFS_ATTR_PTR(devid, fsid), 1994 BTRFS_ATTR_PTR(devid, in_fs_metadata), 1995 BTRFS_ATTR_PTR(devid, missing), 1996 BTRFS_ATTR_PTR(devid, replace_target), 1997 BTRFS_ATTR_PTR(devid, scrub_speed_max), 1998 BTRFS_ATTR_PTR(devid, writeable), 1999 NULL 2000 }; 2001 ATTRIBUTE_GROUPS(devid); 2002 2003 static void btrfs_release_devid_kobj(struct kobject *kobj) 2004 { 2005 struct btrfs_device *device = container_of(kobj, struct btrfs_device, 2006 devid_kobj); 2007 2008 memset(&device->devid_kobj, 0, sizeof(struct kobject)); 2009 complete(&device->kobj_unregister); 2010 } 2011 2012 static const struct kobj_type devid_ktype = { 2013 .sysfs_ops = &kobj_sysfs_ops, 2014 .default_groups = devid_groups, 2015 .release = btrfs_release_devid_kobj, 2016 }; 2017 2018 int btrfs_sysfs_add_device(struct btrfs_device *device) 2019 { 2020 int ret; 2021 unsigned int nofs_flag; 2022 struct kobject *devices_kobj; 2023 struct kobject *devinfo_kobj; 2024 2025 /* 2026 * Make sure we use the fs_info::fs_devices to fetch the kobjects even 2027 * for the seed fs_devices 2028 */ 2029 devices_kobj = device->fs_info->fs_devices->devices_kobj; 2030 devinfo_kobj = device->fs_info->fs_devices->devinfo_kobj; 2031 ASSERT(devices_kobj); 2032 ASSERT(devinfo_kobj); 2033 2034 nofs_flag = memalloc_nofs_save(); 2035 2036 if (device->bdev) { 2037 struct kobject *disk_kobj = bdev_kobj(device->bdev); 2038 2039 ret = sysfs_create_link(devices_kobj, disk_kobj, disk_kobj->name); 2040 if (ret) { 2041 btrfs_warn(device->fs_info, 2042 "creating sysfs device link for devid %llu failed: %d", 2043 device->devid, ret); 2044 goto out; 2045 } 2046 } 2047 2048 init_completion(&device->kobj_unregister); 2049 ret = kobject_init_and_add(&device->devid_kobj, &devid_ktype, 2050 devinfo_kobj, "%llu", device->devid); 2051 if (ret) { 2052 kobject_put(&device->devid_kobj); 2053 btrfs_warn(device->fs_info, 2054 "devinfo init for devid %llu failed: %d", 2055 device->devid, ret); 2056 } 2057 2058 out: 2059 memalloc_nofs_restore(nofs_flag); 2060 return ret; 2061 } 2062 2063 static int btrfs_sysfs_add_fs_devices(struct btrfs_fs_devices *fs_devices) 2064 { 2065 int ret; 2066 struct btrfs_device *device; 2067 struct btrfs_fs_devices *seed; 2068 2069 list_for_each_entry(device, &fs_devices->devices, dev_list) { 2070 ret = btrfs_sysfs_add_device(device); 2071 if (ret) 2072 goto fail; 2073 } 2074 2075 list_for_each_entry(seed, &fs_devices->seed_list, seed_list) { 2076 list_for_each_entry(device, &seed->devices, dev_list) { 2077 ret = btrfs_sysfs_add_device(device); 2078 if (ret) 2079 goto fail; 2080 } 2081 } 2082 2083 return 0; 2084 2085 fail: 2086 btrfs_sysfs_remove_fs_devices(fs_devices); 2087 return ret; 2088 } 2089 2090 void btrfs_kobject_uevent(struct block_device *bdev, enum kobject_action action) 2091 { 2092 int ret; 2093 2094 ret = kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, action); 2095 if (ret) 2096 btrfs_warn(NULL, "sending event %d to kobject: '%s' (%p): failed", 2097 action, kobject_name(&disk_to_dev(bdev->bd_disk)->kobj), 2098 &disk_to_dev(bdev->bd_disk)->kobj); 2099 } 2100 2101 void btrfs_sysfs_update_sprout_fsid(struct btrfs_fs_devices *fs_devices) 2102 2103 { 2104 char fsid_buf[BTRFS_UUID_UNPARSED_SIZE]; 2105 2106 /* 2107 * Sprouting changes fsid of the mounted filesystem, rename the fsid 2108 * directory 2109 */ 2110 snprintf(fsid_buf, BTRFS_UUID_UNPARSED_SIZE, "%pU", fs_devices->fsid); 2111 if (kobject_rename(&fs_devices->fsid_kobj, fsid_buf)) 2112 btrfs_warn(fs_devices->fs_info, 2113 "sysfs: failed to create fsid for sprout"); 2114 } 2115 2116 void btrfs_sysfs_update_devid(struct btrfs_device *device) 2117 { 2118 char tmp[24]; 2119 2120 snprintf(tmp, sizeof(tmp), "%llu", device->devid); 2121 2122 if (kobject_rename(&device->devid_kobj, tmp)) 2123 btrfs_warn(device->fs_devices->fs_info, 2124 "sysfs: failed to update devid for %llu", 2125 device->devid); 2126 } 2127 2128 /* /sys/fs/btrfs/ entry */ 2129 static struct kset *btrfs_kset; 2130 2131 /* 2132 * Creates: 2133 * /sys/fs/btrfs/UUID 2134 * 2135 * Can be called by the device discovery thread. 2136 */ 2137 int btrfs_sysfs_add_fsid(struct btrfs_fs_devices *fs_devs) 2138 { 2139 int ret; 2140 2141 init_completion(&fs_devs->kobj_unregister); 2142 fs_devs->fsid_kobj.kset = btrfs_kset; 2143 ret = kobject_init_and_add(&fs_devs->fsid_kobj, &btrfs_ktype, NULL, 2144 "%pU", fs_devs->fsid); 2145 if (ret) { 2146 kobject_put(&fs_devs->fsid_kobj); 2147 return ret; 2148 } 2149 2150 fs_devs->devices_kobj = kobject_create_and_add("devices", 2151 &fs_devs->fsid_kobj); 2152 if (!fs_devs->devices_kobj) { 2153 btrfs_err(fs_devs->fs_info, 2154 "failed to init sysfs device interface"); 2155 btrfs_sysfs_remove_fsid(fs_devs); 2156 return -ENOMEM; 2157 } 2158 2159 fs_devs->devinfo_kobj = kobject_create_and_add("devinfo", 2160 &fs_devs->fsid_kobj); 2161 if (!fs_devs->devinfo_kobj) { 2162 btrfs_err(fs_devs->fs_info, 2163 "failed to init sysfs devinfo kobject"); 2164 btrfs_sysfs_remove_fsid(fs_devs); 2165 return -ENOMEM; 2166 } 2167 2168 return 0; 2169 } 2170 2171 int btrfs_sysfs_add_mounted(struct btrfs_fs_info *fs_info) 2172 { 2173 int ret; 2174 struct btrfs_fs_devices *fs_devs = fs_info->fs_devices; 2175 struct kobject *fsid_kobj = &fs_devs->fsid_kobj; 2176 2177 ret = btrfs_sysfs_add_fs_devices(fs_devs); 2178 if (ret) 2179 return ret; 2180 2181 ret = sysfs_create_files(fsid_kobj, btrfs_attrs); 2182 if (ret) { 2183 btrfs_sysfs_remove_fs_devices(fs_devs); 2184 return ret; 2185 } 2186 2187 ret = sysfs_create_group(fsid_kobj, &btrfs_feature_attr_group); 2188 if (ret) 2189 goto failure; 2190 2191 #ifdef CONFIG_BTRFS_DEBUG 2192 fs_info->debug_kobj = kobject_create_and_add("debug", fsid_kobj); 2193 if (!fs_info->debug_kobj) { 2194 ret = -ENOMEM; 2195 goto failure; 2196 } 2197 2198 ret = sysfs_create_files(fs_info->debug_kobj, btrfs_debug_mount_attrs); 2199 if (ret) 2200 goto failure; 2201 #endif 2202 2203 /* Discard directory */ 2204 fs_info->discard_kobj = kobject_create_and_add("discard", fsid_kobj); 2205 if (!fs_info->discard_kobj) { 2206 ret = -ENOMEM; 2207 goto failure; 2208 } 2209 2210 ret = sysfs_create_files(fs_info->discard_kobj, discard_attrs); 2211 if (ret) 2212 goto failure; 2213 2214 ret = addrm_unknown_feature_attrs(fs_info, true); 2215 if (ret) 2216 goto failure; 2217 2218 ret = sysfs_create_link(fsid_kobj, &fs_info->sb->s_bdi->dev->kobj, "bdi"); 2219 if (ret) 2220 goto failure; 2221 2222 fs_info->space_info_kobj = kobject_create_and_add("allocation", 2223 fsid_kobj); 2224 if (!fs_info->space_info_kobj) { 2225 ret = -ENOMEM; 2226 goto failure; 2227 } 2228 2229 ret = sysfs_create_files(fs_info->space_info_kobj, allocation_attrs); 2230 if (ret) 2231 goto failure; 2232 2233 return 0; 2234 failure: 2235 btrfs_sysfs_remove_mounted(fs_info); 2236 return ret; 2237 } 2238 2239 static ssize_t qgroup_enabled_show(struct kobject *qgroups_kobj, 2240 struct kobj_attribute *a, 2241 char *buf) 2242 { 2243 struct btrfs_fs_info *fs_info = to_fs_info(qgroups_kobj->parent); 2244 bool enabled; 2245 2246 enabled = test_bit(BTRFS_QGROUP_STATUS_BIT_ON, &fs_info->qgroup_flags); 2247 2248 return sysfs_emit(buf, "%d\n", enabled); 2249 } 2250 BTRFS_ATTR(qgroups, enabled, qgroup_enabled_show); 2251 2252 static ssize_t qgroup_mode_show(struct kobject *qgroups_kobj, 2253 struct kobj_attribute *a, 2254 char *buf) 2255 { 2256 struct btrfs_fs_info *fs_info = to_fs_info(qgroups_kobj->parent); 2257 ssize_t ret = 0; 2258 2259 spin_lock(&fs_info->qgroup_lock); 2260 ASSERT(btrfs_qgroup_enabled(fs_info)); 2261 switch (btrfs_qgroup_mode(fs_info)) { 2262 case BTRFS_QGROUP_MODE_FULL: 2263 ret = sysfs_emit(buf, "qgroup\n"); 2264 break; 2265 case BTRFS_QGROUP_MODE_SIMPLE: 2266 ret = sysfs_emit(buf, "squota\n"); 2267 break; 2268 default: 2269 btrfs_warn(fs_info, "unexpected qgroup mode %d\n", 2270 btrfs_qgroup_mode(fs_info)); 2271 break; 2272 } 2273 spin_unlock(&fs_info->qgroup_lock); 2274 2275 return ret; 2276 } 2277 BTRFS_ATTR(qgroups, mode, qgroup_mode_show); 2278 2279 static ssize_t qgroup_inconsistent_show(struct kobject *qgroups_kobj, 2280 struct kobj_attribute *a, 2281 char *buf) 2282 { 2283 struct btrfs_fs_info *fs_info = to_fs_info(qgroups_kobj->parent); 2284 bool inconsistent; 2285 2286 inconsistent = test_bit(BTRFS_QGROUP_STATUS_BIT_INCONSISTENT, &fs_info->qgroup_flags); 2287 2288 return sysfs_emit(buf, "%d\n", inconsistent); 2289 } 2290 BTRFS_ATTR(qgroups, inconsistent, qgroup_inconsistent_show); 2291 2292 static ssize_t qgroup_drop_subtree_thres_show(struct kobject *qgroups_kobj, 2293 struct kobj_attribute *a, 2294 char *buf) 2295 { 2296 struct btrfs_fs_info *fs_info = to_fs_info(qgroups_kobj->parent); 2297 u8 result; 2298 2299 spin_lock(&fs_info->qgroup_lock); 2300 result = fs_info->qgroup_drop_subtree_thres; 2301 spin_unlock(&fs_info->qgroup_lock); 2302 2303 return sysfs_emit(buf, "%d\n", result); 2304 } 2305 2306 static ssize_t qgroup_drop_subtree_thres_store(struct kobject *qgroups_kobj, 2307 struct kobj_attribute *a, 2308 const char *buf, size_t len) 2309 { 2310 struct btrfs_fs_info *fs_info = to_fs_info(qgroups_kobj->parent); 2311 u8 new_thres; 2312 int ret; 2313 2314 ret = kstrtou8(buf, 10, &new_thres); 2315 if (ret) 2316 return -EINVAL; 2317 2318 if (new_thres > BTRFS_MAX_LEVEL) 2319 return -EINVAL; 2320 2321 spin_lock(&fs_info->qgroup_lock); 2322 fs_info->qgroup_drop_subtree_thres = new_thres; 2323 spin_unlock(&fs_info->qgroup_lock); 2324 2325 return len; 2326 } 2327 BTRFS_ATTR_RW(qgroups, drop_subtree_threshold, qgroup_drop_subtree_thres_show, 2328 qgroup_drop_subtree_thres_store); 2329 2330 /* 2331 * Qgroups global info 2332 * 2333 * Path: /sys/fs/btrfs/<uuid>/qgroups/ 2334 */ 2335 static struct attribute *qgroups_attrs[] = { 2336 BTRFS_ATTR_PTR(qgroups, enabled), 2337 BTRFS_ATTR_PTR(qgroups, inconsistent), 2338 BTRFS_ATTR_PTR(qgroups, drop_subtree_threshold), 2339 BTRFS_ATTR_PTR(qgroups, mode), 2340 NULL 2341 }; 2342 ATTRIBUTE_GROUPS(qgroups); 2343 2344 static void qgroups_release(struct kobject *kobj) 2345 { 2346 kfree(kobj); 2347 } 2348 2349 static const struct kobj_type qgroups_ktype = { 2350 .sysfs_ops = &kobj_sysfs_ops, 2351 .default_groups = qgroups_groups, 2352 .release = qgroups_release, 2353 }; 2354 2355 static inline struct btrfs_fs_info *qgroup_kobj_to_fs_info(struct kobject *kobj) 2356 { 2357 return to_fs_info(kobj->parent->parent); 2358 } 2359 2360 #define QGROUP_ATTR(_member, _show_name) \ 2361 static ssize_t btrfs_qgroup_show_##_member(struct kobject *qgroup_kobj, \ 2362 struct kobj_attribute *a, \ 2363 char *buf) \ 2364 { \ 2365 struct btrfs_fs_info *fs_info = qgroup_kobj_to_fs_info(qgroup_kobj); \ 2366 struct btrfs_qgroup *qgroup = container_of(qgroup_kobj, \ 2367 struct btrfs_qgroup, kobj); \ 2368 return btrfs_show_u64(&qgroup->_member, &fs_info->qgroup_lock, buf); \ 2369 } \ 2370 BTRFS_ATTR(qgroup, _show_name, btrfs_qgroup_show_##_member) 2371 2372 #define QGROUP_RSV_ATTR(_name, _type) \ 2373 static ssize_t btrfs_qgroup_rsv_show_##_name(struct kobject *qgroup_kobj, \ 2374 struct kobj_attribute *a, \ 2375 char *buf) \ 2376 { \ 2377 struct btrfs_fs_info *fs_info = qgroup_kobj_to_fs_info(qgroup_kobj); \ 2378 struct btrfs_qgroup *qgroup = container_of(qgroup_kobj, \ 2379 struct btrfs_qgroup, kobj); \ 2380 return btrfs_show_u64(&qgroup->rsv.values[_type], \ 2381 &fs_info->qgroup_lock, buf); \ 2382 } \ 2383 BTRFS_ATTR(qgroup, rsv_##_name, btrfs_qgroup_rsv_show_##_name) 2384 2385 QGROUP_ATTR(rfer, referenced); 2386 QGROUP_ATTR(excl, exclusive); 2387 QGROUP_ATTR(max_rfer, max_referenced); 2388 QGROUP_ATTR(max_excl, max_exclusive); 2389 QGROUP_ATTR(lim_flags, limit_flags); 2390 QGROUP_RSV_ATTR(data, BTRFS_QGROUP_RSV_DATA); 2391 QGROUP_RSV_ATTR(meta_pertrans, BTRFS_QGROUP_RSV_META_PERTRANS); 2392 QGROUP_RSV_ATTR(meta_prealloc, BTRFS_QGROUP_RSV_META_PREALLOC); 2393 2394 /* 2395 * Qgroup information. 2396 * 2397 * Path: /sys/fs/btrfs/<uuid>/qgroups/<level>_<qgroupid>/ 2398 */ 2399 static struct attribute *qgroup_attrs[] = { 2400 BTRFS_ATTR_PTR(qgroup, referenced), 2401 BTRFS_ATTR_PTR(qgroup, exclusive), 2402 BTRFS_ATTR_PTR(qgroup, max_referenced), 2403 BTRFS_ATTR_PTR(qgroup, max_exclusive), 2404 BTRFS_ATTR_PTR(qgroup, limit_flags), 2405 BTRFS_ATTR_PTR(qgroup, rsv_data), 2406 BTRFS_ATTR_PTR(qgroup, rsv_meta_pertrans), 2407 BTRFS_ATTR_PTR(qgroup, rsv_meta_prealloc), 2408 NULL 2409 }; 2410 ATTRIBUTE_GROUPS(qgroup); 2411 2412 static void qgroup_release(struct kobject *kobj) 2413 { 2414 struct btrfs_qgroup *qgroup = container_of(kobj, struct btrfs_qgroup, kobj); 2415 2416 memset(&qgroup->kobj, 0, sizeof(*kobj)); 2417 } 2418 2419 static const struct kobj_type qgroup_ktype = { 2420 .sysfs_ops = &kobj_sysfs_ops, 2421 .release = qgroup_release, 2422 .default_groups = qgroup_groups, 2423 }; 2424 2425 int btrfs_sysfs_add_one_qgroup(struct btrfs_fs_info *fs_info, 2426 struct btrfs_qgroup *qgroup) 2427 { 2428 struct kobject *qgroups_kobj = fs_info->qgroups_kobj; 2429 int ret; 2430 2431 if (btrfs_is_testing(fs_info)) 2432 return 0; 2433 if (qgroup->kobj.state_initialized) 2434 return 0; 2435 if (!qgroups_kobj) 2436 return -EINVAL; 2437 2438 ret = kobject_init_and_add(&qgroup->kobj, &qgroup_ktype, qgroups_kobj, 2439 "%hu_%llu", btrfs_qgroup_level(qgroup->qgroupid), 2440 btrfs_qgroup_subvolid(qgroup->qgroupid)); 2441 if (ret < 0) 2442 kobject_put(&qgroup->kobj); 2443 2444 return ret; 2445 } 2446 2447 void btrfs_sysfs_del_qgroups(struct btrfs_fs_info *fs_info) 2448 { 2449 struct btrfs_qgroup *qgroup; 2450 struct btrfs_qgroup *next; 2451 2452 if (btrfs_is_testing(fs_info)) 2453 return; 2454 2455 rbtree_postorder_for_each_entry_safe(qgroup, next, 2456 &fs_info->qgroup_tree, node) 2457 btrfs_sysfs_del_one_qgroup(fs_info, qgroup); 2458 if (fs_info->qgroups_kobj) { 2459 kobject_del(fs_info->qgroups_kobj); 2460 kobject_put(fs_info->qgroups_kobj); 2461 fs_info->qgroups_kobj = NULL; 2462 } 2463 } 2464 2465 /* Called when qgroups get initialized, thus there is no need for locking */ 2466 int btrfs_sysfs_add_qgroups(struct btrfs_fs_info *fs_info) 2467 { 2468 struct kobject *fsid_kobj = &fs_info->fs_devices->fsid_kobj; 2469 struct btrfs_qgroup *qgroup; 2470 struct btrfs_qgroup *next; 2471 int ret = 0; 2472 2473 if (btrfs_is_testing(fs_info)) 2474 return 0; 2475 2476 ASSERT(fsid_kobj); 2477 if (fs_info->qgroups_kobj) 2478 return 0; 2479 2480 fs_info->qgroups_kobj = kzalloc_obj(struct kobject); 2481 if (!fs_info->qgroups_kobj) 2482 return -ENOMEM; 2483 2484 ret = kobject_init_and_add(fs_info->qgroups_kobj, &qgroups_ktype, 2485 fsid_kobj, "qgroups"); 2486 if (ret < 0) 2487 goto out; 2488 2489 rbtree_postorder_for_each_entry_safe(qgroup, next, 2490 &fs_info->qgroup_tree, node) { 2491 ret = btrfs_sysfs_add_one_qgroup(fs_info, qgroup); 2492 if (ret < 0) 2493 goto out; 2494 } 2495 2496 out: 2497 if (ret < 0) 2498 btrfs_sysfs_del_qgroups(fs_info); 2499 return ret; 2500 } 2501 2502 void btrfs_sysfs_del_one_qgroup(struct btrfs_fs_info *fs_info, 2503 struct btrfs_qgroup *qgroup) 2504 { 2505 if (btrfs_is_testing(fs_info)) 2506 return; 2507 2508 if (qgroup->kobj.state_initialized) { 2509 kobject_del(&qgroup->kobj); 2510 kobject_put(&qgroup->kobj); 2511 } 2512 } 2513 2514 /* 2515 * Change per-fs features in /sys/fs/btrfs/UUID/features to match current 2516 * values in superblock. Call after any changes to incompat/compat_ro flags 2517 */ 2518 void btrfs_sysfs_feature_update(struct btrfs_fs_info *fs_info) 2519 { 2520 struct kobject *fsid_kobj; 2521 int ret; 2522 2523 if (!fs_info) 2524 return; 2525 2526 fsid_kobj = &fs_info->fs_devices->fsid_kobj; 2527 if (!fsid_kobj->state_initialized) 2528 return; 2529 2530 ret = sysfs_update_group(fsid_kobj, &btrfs_feature_attr_group); 2531 if (ret < 0) 2532 btrfs_warn(fs_info, 2533 "failed to update /sys/fs/btrfs/%pU/features: %d", 2534 fs_info->fs_devices->fsid, ret); 2535 } 2536 2537 int __init btrfs_init_sysfs(void) 2538 { 2539 int ret; 2540 2541 btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj); 2542 if (!btrfs_kset) 2543 return -ENOMEM; 2544 2545 init_feature_attrs(); 2546 ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); 2547 if (ret) 2548 goto out2; 2549 ret = sysfs_merge_group(&btrfs_kset->kobj, 2550 &btrfs_static_feature_attr_group); 2551 if (ret) 2552 goto out_remove_group; 2553 2554 #ifdef CONFIG_BTRFS_DEBUG 2555 ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_debug_feature_attr_group); 2556 if (ret) { 2557 sysfs_unmerge_group(&btrfs_kset->kobj, 2558 &btrfs_static_feature_attr_group); 2559 goto out_remove_group; 2560 } 2561 #endif 2562 2563 return 0; 2564 2565 out_remove_group: 2566 sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); 2567 out2: 2568 kset_unregister(btrfs_kset); 2569 2570 return ret; 2571 } 2572 2573 void __cold btrfs_exit_sysfs(void) 2574 { 2575 sysfs_unmerge_group(&btrfs_kset->kobj, 2576 &btrfs_static_feature_attr_group); 2577 sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); 2578 #ifdef CONFIG_BTRFS_DEBUG 2579 sysfs_remove_group(&btrfs_kset->kobj, &btrfs_debug_feature_attr_group); 2580 #endif 2581 kset_unregister(btrfs_kset); 2582 } 2583