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