1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2007 Oracle. All rights reserved. 4 */ 5 6 #include <linux/sched.h> 7 #include <linux/sched/mm.h> 8 #include <linux/slab.h> 9 #include <linux/spinlock.h> 10 #include <linux/completion.h> 11 #include <linux/bug.h> 12 #include <linux/list.h> 13 #include <crypto/hash.h> 14 #include "messages.h" 15 #include "ctree.h" 16 #include "discard.h" 17 #include "disk-io.h" 18 #include "send.h" 19 #include "transaction.h" 20 #include "sysfs.h" 21 #include "volumes.h" 22 #include "space-info.h" 23 #include "block-group.h" 24 #include "qgroup.h" 25 #include "misc.h" 26 #include "fs.h" 27 #include "accessors.h" 28 29 /* 30 * Structure name Path 31 * -------------------------------------------------------------------------- 32 * btrfs_supported_static_feature_attrs /sys/fs/btrfs/features 33 * btrfs_supported_feature_attrs /sys/fs/btrfs/features and 34 * /sys/fs/btrfs/<uuid>/features 35 * btrfs_attrs /sys/fs/btrfs/<uuid> 36 * devid_attrs /sys/fs/btrfs/<uuid>/devinfo/<devid> 37 * allocation_attrs /sys/fs/btrfs/<uuid>/allocation 38 * qgroup_attrs /sys/fs/btrfs/<uuid>/qgroups/<level>_<qgroupid> 39 * space_info_attrs /sys/fs/btrfs/<uuid>/allocation/<bg-type> 40 * raid_attrs /sys/fs/btrfs/<uuid>/allocation/<bg-type>/<bg-profile> 41 * discard_attrs /sys/fs/btrfs/<uuid>/discard 42 * 43 * When built with BTRFS_CONFIG_DEBUG: 44 * 45 * btrfs_debug_feature_attrs /sys/fs/btrfs/debug 46 * btrfs_debug_mount_attrs /sys/fs/btrfs/<uuid>/debug 47 */ 48 49 struct btrfs_feature_attr { 50 struct kobj_attribute kobj_attr; 51 enum btrfs_feature_set feature_set; 52 u64 feature_bit; 53 }; 54 55 /* For raid type sysfs entries */ 56 struct raid_kobject { 57 u64 flags; 58 struct kobject kobj; 59 }; 60 61 #define __INIT_KOBJ_ATTR(_name, _mode, _show, _store) \ 62 { \ 63 .attr = { .name = __stringify(_name), .mode = _mode }, \ 64 .show = _show, \ 65 .store = _store, \ 66 } 67 68 #define BTRFS_ATTR_W(_prefix, _name, _store) \ 69 static struct kobj_attribute btrfs_attr_##_prefix##_##_name = \ 70 __INIT_KOBJ_ATTR(_name, 0200, NULL, _store) 71 72 #define BTRFS_ATTR_RW(_prefix, _name, _show, _store) \ 73 static struct kobj_attribute btrfs_attr_##_prefix##_##_name = \ 74 __INIT_KOBJ_ATTR(_name, 0644, _show, _store) 75 76 #define BTRFS_ATTR(_prefix, _name, _show) \ 77 static struct kobj_attribute btrfs_attr_##_prefix##_##_name = \ 78 __INIT_KOBJ_ATTR(_name, 0444, _show, NULL) 79 80 #define BTRFS_ATTR_PTR(_prefix, _name) \ 81 (&btrfs_attr_##_prefix##_##_name.attr) 82 83 #define BTRFS_FEAT_ATTR(_name, _feature_set, _feature_prefix, _feature_bit) \ 84 static struct btrfs_feature_attr btrfs_attr_features_##_name = { \ 85 .kobj_attr = __INIT_KOBJ_ATTR(_name, S_IRUGO, \ 86 btrfs_feature_attr_show, \ 87 btrfs_feature_attr_store), \ 88 .feature_set = _feature_set, \ 89 .feature_bit = _feature_prefix ##_## _feature_bit, \ 90 } 91 #define BTRFS_FEAT_ATTR_PTR(_name) \ 92 (&btrfs_attr_features_##_name.kobj_attr.attr) 93 94 #define BTRFS_FEAT_ATTR_COMPAT(name, feature) \ 95 BTRFS_FEAT_ATTR(name, FEAT_COMPAT, BTRFS_FEATURE_COMPAT, feature) 96 #define BTRFS_FEAT_ATTR_COMPAT_RO(name, feature) \ 97 BTRFS_FEAT_ATTR(name, FEAT_COMPAT_RO, BTRFS_FEATURE_COMPAT_RO, feature) 98 #define BTRFS_FEAT_ATTR_INCOMPAT(name, feature) \ 99 BTRFS_FEAT_ATTR(name, FEAT_INCOMPAT, BTRFS_FEATURE_INCOMPAT, feature) 100 101 static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj); 102 static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj); 103 static struct kobject *get_btrfs_kobj(struct kobject *kobj); 104 105 static struct btrfs_feature_attr *to_btrfs_feature_attr(struct kobj_attribute *a) 106 { 107 return container_of(a, struct btrfs_feature_attr, kobj_attr); 108 } 109 110 static struct kobj_attribute *attr_to_btrfs_attr(struct attribute *attr) 111 { 112 return container_of(attr, struct kobj_attribute, attr); 113 } 114 115 static struct btrfs_feature_attr *attr_to_btrfs_feature_attr( 116 struct attribute *attr) 117 { 118 return to_btrfs_feature_attr(attr_to_btrfs_attr(attr)); 119 } 120 121 static u64 get_features(struct btrfs_fs_info *fs_info, 122 enum btrfs_feature_set set) 123 { 124 struct btrfs_super_block *disk_super = fs_info->super_copy; 125 if (set == FEAT_COMPAT) 126 return btrfs_super_compat_flags(disk_super); 127 else if (set == FEAT_COMPAT_RO) 128 return btrfs_super_compat_ro_flags(disk_super); 129 else 130 return btrfs_super_incompat_flags(disk_super); 131 } 132 133 static void set_features(struct btrfs_fs_info *fs_info, 134 enum btrfs_feature_set set, u64 features) 135 { 136 struct btrfs_super_block *disk_super = fs_info->super_copy; 137 if (set == FEAT_COMPAT) 138 btrfs_set_super_compat_flags(disk_super, features); 139 else if (set == FEAT_COMPAT_RO) 140 btrfs_set_super_compat_ro_flags(disk_super, features); 141 else 142 btrfs_set_super_incompat_flags(disk_super, features); 143 } 144 145 static int can_modify_feature(struct btrfs_feature_attr *fa) 146 { 147 int val = 0; 148 u64 set, clear; 149 switch (fa->feature_set) { 150 case FEAT_COMPAT: 151 set = BTRFS_FEATURE_COMPAT_SAFE_SET; 152 clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR; 153 break; 154 case FEAT_COMPAT_RO: 155 set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET; 156 clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR; 157 break; 158 case FEAT_INCOMPAT: 159 set = BTRFS_FEATURE_INCOMPAT_SAFE_SET; 160 clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR; 161 break; 162 default: 163 pr_warn("btrfs: sysfs: unknown feature set %d\n", 164 fa->feature_set); 165 return 0; 166 } 167 168 if (set & fa->feature_bit) 169 val |= 1; 170 if (clear & fa->feature_bit) 171 val |= 2; 172 173 return val; 174 } 175 176 static ssize_t btrfs_feature_attr_show(struct kobject *kobj, 177 struct kobj_attribute *a, char *buf) 178 { 179 int val = 0; 180 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 181 struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a); 182 if (fs_info) { 183 u64 features = get_features(fs_info, fa->feature_set); 184 if (features & fa->feature_bit) 185 val = 1; 186 } else 187 val = can_modify_feature(fa); 188 189 return sysfs_emit(buf, "%d\n", val); 190 } 191 192 static ssize_t btrfs_feature_attr_store(struct kobject *kobj, 193 struct kobj_attribute *a, 194 const char *buf, size_t count) 195 { 196 struct btrfs_fs_info *fs_info; 197 struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a); 198 u64 features, set, clear; 199 unsigned long val; 200 int ret; 201 202 fs_info = to_fs_info(kobj); 203 if (!fs_info) 204 return -EPERM; 205 206 if (sb_rdonly(fs_info->sb)) 207 return -EROFS; 208 209 ret = kstrtoul(skip_spaces(buf), 0, &val); 210 if (ret) 211 return ret; 212 213 if (fa->feature_set == FEAT_COMPAT) { 214 set = BTRFS_FEATURE_COMPAT_SAFE_SET; 215 clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR; 216 } else if (fa->feature_set == FEAT_COMPAT_RO) { 217 set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET; 218 clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR; 219 } else { 220 set = BTRFS_FEATURE_INCOMPAT_SAFE_SET; 221 clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR; 222 } 223 224 features = get_features(fs_info, fa->feature_set); 225 226 /* Nothing to do */ 227 if ((val && (features & fa->feature_bit)) || 228 (!val && !(features & fa->feature_bit))) 229 return count; 230 231 if ((val && !(set & fa->feature_bit)) || 232 (!val && !(clear & fa->feature_bit))) { 233 btrfs_info(fs_info, 234 "%sabling feature %s on mounted fs is not supported.", 235 val ? "En" : "Dis", fa->kobj_attr.attr.name); 236 return -EPERM; 237 } 238 239 btrfs_info(fs_info, "%s %s feature flag", 240 val ? "Setting" : "Clearing", fa->kobj_attr.attr.name); 241 242 spin_lock(&fs_info->super_lock); 243 features = get_features(fs_info, fa->feature_set); 244 if (val) 245 features |= fa->feature_bit; 246 else 247 features &= ~fa->feature_bit; 248 set_features(fs_info, fa->feature_set, features); 249 spin_unlock(&fs_info->super_lock); 250 251 /* 252 * We don't want to do full transaction commit from inside sysfs 253 */ 254 set_bit(BTRFS_FS_NEED_TRANS_COMMIT, &fs_info->flags); 255 wake_up_process(fs_info->transaction_kthread); 256 257 return count; 258 } 259 260 static umode_t btrfs_feature_visible(struct kobject *kobj, 261 struct attribute *attr, int unused) 262 { 263 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 264 umode_t mode = attr->mode; 265 266 if (fs_info) { 267 struct btrfs_feature_attr *fa; 268 u64 features; 269 270 fa = attr_to_btrfs_feature_attr(attr); 271 features = get_features(fs_info, fa->feature_set); 272 273 if (can_modify_feature(fa)) 274 mode |= S_IWUSR; 275 else if (!(features & fa->feature_bit)) 276 mode = 0; 277 } 278 279 return mode; 280 } 281 282 BTRFS_FEAT_ATTR_INCOMPAT(default_subvol, DEFAULT_SUBVOL); 283 BTRFS_FEAT_ATTR_INCOMPAT(mixed_groups, MIXED_GROUPS); 284 BTRFS_FEAT_ATTR_INCOMPAT(compress_lzo, COMPRESS_LZO); 285 BTRFS_FEAT_ATTR_INCOMPAT(compress_zstd, COMPRESS_ZSTD); 286 BTRFS_FEAT_ATTR_INCOMPAT(extended_iref, EXTENDED_IREF); 287 BTRFS_FEAT_ATTR_INCOMPAT(raid56, RAID56); 288 BTRFS_FEAT_ATTR_INCOMPAT(skinny_metadata, SKINNY_METADATA); 289 BTRFS_FEAT_ATTR_INCOMPAT(no_holes, NO_HOLES); 290 BTRFS_FEAT_ATTR_INCOMPAT(metadata_uuid, METADATA_UUID); 291 BTRFS_FEAT_ATTR_COMPAT_RO(free_space_tree, FREE_SPACE_TREE); 292 BTRFS_FEAT_ATTR_COMPAT_RO(block_group_tree, BLOCK_GROUP_TREE); 293 BTRFS_FEAT_ATTR_INCOMPAT(raid1c34, RAID1C34); 294 BTRFS_FEAT_ATTR_INCOMPAT(simple_quota, SIMPLE_QUOTA); 295 #ifdef CONFIG_BLK_DEV_ZONED 296 BTRFS_FEAT_ATTR_INCOMPAT(zoned, ZONED); 297 #endif 298 #ifdef CONFIG_BTRFS_DEBUG 299 /* Remove once support for extent tree v2 is feature complete */ 300 BTRFS_FEAT_ATTR_INCOMPAT(extent_tree_v2, EXTENT_TREE_V2); 301 /* Remove once support for raid stripe tree is feature complete. */ 302 BTRFS_FEAT_ATTR_INCOMPAT(raid_stripe_tree, RAID_STRIPE_TREE); 303 #endif 304 #ifdef CONFIG_FS_VERITY 305 BTRFS_FEAT_ATTR_COMPAT_RO(verity, VERITY); 306 #endif 307 308 /* 309 * Features which depend on feature bits and may differ between each fs. 310 * 311 * /sys/fs/btrfs/features - all available features implemented by this version 312 * /sys/fs/btrfs/UUID/features - features of the fs which are enabled or 313 * can be changed on a mounted filesystem. 314 */ 315 static struct attribute *btrfs_supported_feature_attrs[] = { 316 BTRFS_FEAT_ATTR_PTR(default_subvol), 317 BTRFS_FEAT_ATTR_PTR(mixed_groups), 318 BTRFS_FEAT_ATTR_PTR(compress_lzo), 319 BTRFS_FEAT_ATTR_PTR(compress_zstd), 320 BTRFS_FEAT_ATTR_PTR(extended_iref), 321 BTRFS_FEAT_ATTR_PTR(raid56), 322 BTRFS_FEAT_ATTR_PTR(skinny_metadata), 323 BTRFS_FEAT_ATTR_PTR(no_holes), 324 BTRFS_FEAT_ATTR_PTR(metadata_uuid), 325 BTRFS_FEAT_ATTR_PTR(free_space_tree), 326 BTRFS_FEAT_ATTR_PTR(raid1c34), 327 BTRFS_FEAT_ATTR_PTR(block_group_tree), 328 BTRFS_FEAT_ATTR_PTR(simple_quota), 329 #ifdef CONFIG_BLK_DEV_ZONED 330 BTRFS_FEAT_ATTR_PTR(zoned), 331 #endif 332 #ifdef CONFIG_BTRFS_DEBUG 333 BTRFS_FEAT_ATTR_PTR(extent_tree_v2), 334 BTRFS_FEAT_ATTR_PTR(raid_stripe_tree), 335 #endif 336 #ifdef CONFIG_FS_VERITY 337 BTRFS_FEAT_ATTR_PTR(verity), 338 #endif 339 NULL 340 }; 341 342 static const struct attribute_group btrfs_feature_attr_group = { 343 .name = "features", 344 .is_visible = btrfs_feature_visible, 345 .attrs = btrfs_supported_feature_attrs, 346 }; 347 348 static ssize_t rmdir_subvol_show(struct kobject *kobj, 349 struct kobj_attribute *ka, char *buf) 350 { 351 return sysfs_emit(buf, "0\n"); 352 } 353 BTRFS_ATTR(static_feature, rmdir_subvol, rmdir_subvol_show); 354 355 static ssize_t supported_checksums_show(struct kobject *kobj, 356 struct kobj_attribute *a, char *buf) 357 { 358 ssize_t ret = 0; 359 int i; 360 361 for (i = 0; i < btrfs_get_num_csums(); i++) { 362 /* 363 * This "trick" only works as long as 'enum btrfs_csum_type' has 364 * no holes in it 365 */ 366 ret += sysfs_emit_at(buf, ret, "%s%s", (i == 0 ? "" : " "), 367 btrfs_super_csum_name(i)); 368 369 } 370 371 ret += sysfs_emit_at(buf, ret, "\n"); 372 return ret; 373 } 374 BTRFS_ATTR(static_feature, supported_checksums, supported_checksums_show); 375 376 static ssize_t send_stream_version_show(struct kobject *kobj, 377 struct kobj_attribute *ka, char *buf) 378 { 379 return sysfs_emit(buf, "%d\n", BTRFS_SEND_STREAM_VERSION); 380 } 381 BTRFS_ATTR(static_feature, send_stream_version, send_stream_version_show); 382 383 static const char *rescue_opts[] = { 384 "usebackuproot", 385 "nologreplay", 386 "ignorebadroots", 387 "ignoredatacsums", 388 "ignoremetacsums", 389 "ignoresuperflags", 390 "all", 391 }; 392 393 static ssize_t supported_rescue_options_show(struct kobject *kobj, 394 struct kobj_attribute *a, 395 char *buf) 396 { 397 ssize_t ret = 0; 398 int i; 399 400 for (i = 0; i < ARRAY_SIZE(rescue_opts); i++) 401 ret += sysfs_emit_at(buf, ret, "%s%s", (i ? " " : ""), rescue_opts[i]); 402 ret += sysfs_emit_at(buf, ret, "\n"); 403 return ret; 404 } 405 BTRFS_ATTR(static_feature, supported_rescue_options, 406 supported_rescue_options_show); 407 408 static ssize_t supported_sectorsizes_show(struct kobject *kobj, 409 struct kobj_attribute *a, 410 char *buf) 411 { 412 ssize_t ret = 0; 413 414 /* An artificial limit to only support 4K and PAGE_SIZE */ 415 if (PAGE_SIZE > SZ_4K) 416 ret += sysfs_emit_at(buf, ret, "%u ", SZ_4K); 417 ret += sysfs_emit_at(buf, ret, "%lu\n", PAGE_SIZE); 418 419 return ret; 420 } 421 BTRFS_ATTR(static_feature, supported_sectorsizes, 422 supported_sectorsizes_show); 423 424 static ssize_t acl_show(struct kobject *kobj, struct kobj_attribute *a, char *buf) 425 { 426 return sysfs_emit(buf, "%d\n", IS_ENABLED(CONFIG_BTRFS_FS_POSIX_ACL)); 427 } 428 BTRFS_ATTR(static_feature, acl, acl_show); 429 430 static ssize_t temp_fsid_supported_show(struct kobject *kobj, 431 struct kobj_attribute *a, char *buf) 432 { 433 return sysfs_emit(buf, "0\n"); 434 } 435 BTRFS_ATTR(static_feature, temp_fsid, temp_fsid_supported_show); 436 437 /* 438 * Features which only depend on kernel version. 439 * 440 * These are listed in /sys/fs/btrfs/features along with 441 * btrfs_supported_feature_attrs. 442 */ 443 static struct attribute *btrfs_supported_static_feature_attrs[] = { 444 BTRFS_ATTR_PTR(static_feature, acl), 445 BTRFS_ATTR_PTR(static_feature, rmdir_subvol), 446 BTRFS_ATTR_PTR(static_feature, supported_checksums), 447 BTRFS_ATTR_PTR(static_feature, send_stream_version), 448 BTRFS_ATTR_PTR(static_feature, supported_rescue_options), 449 BTRFS_ATTR_PTR(static_feature, supported_sectorsizes), 450 BTRFS_ATTR_PTR(static_feature, temp_fsid), 451 NULL 452 }; 453 454 static const struct attribute_group btrfs_static_feature_attr_group = { 455 .name = "features", 456 .attrs = btrfs_supported_static_feature_attrs, 457 }; 458 459 /* 460 * Discard statistics and tunables 461 */ 462 #define discard_to_fs_info(_kobj) to_fs_info(get_btrfs_kobj(_kobj)) 463 464 static ssize_t btrfs_discardable_bytes_show(struct kobject *kobj, 465 struct kobj_attribute *a, 466 char *buf) 467 { 468 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 469 470 return sysfs_emit(buf, "%lld\n", 471 atomic64_read(&fs_info->discard_ctl.discardable_bytes)); 472 } 473 BTRFS_ATTR(discard, discardable_bytes, btrfs_discardable_bytes_show); 474 475 static ssize_t btrfs_discardable_extents_show(struct kobject *kobj, 476 struct kobj_attribute *a, 477 char *buf) 478 { 479 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 480 481 return sysfs_emit(buf, "%d\n", 482 atomic_read(&fs_info->discard_ctl.discardable_extents)); 483 } 484 BTRFS_ATTR(discard, discardable_extents, btrfs_discardable_extents_show); 485 486 static ssize_t btrfs_discard_bitmap_bytes_show(struct kobject *kobj, 487 struct kobj_attribute *a, 488 char *buf) 489 { 490 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 491 492 return sysfs_emit(buf, "%llu\n", 493 fs_info->discard_ctl.discard_bitmap_bytes); 494 } 495 BTRFS_ATTR(discard, discard_bitmap_bytes, btrfs_discard_bitmap_bytes_show); 496 497 static ssize_t btrfs_discard_bytes_saved_show(struct kobject *kobj, 498 struct kobj_attribute *a, 499 char *buf) 500 { 501 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 502 503 return sysfs_emit(buf, "%lld\n", 504 atomic64_read(&fs_info->discard_ctl.discard_bytes_saved)); 505 } 506 BTRFS_ATTR(discard, discard_bytes_saved, btrfs_discard_bytes_saved_show); 507 508 static ssize_t btrfs_discard_extent_bytes_show(struct kobject *kobj, 509 struct kobj_attribute *a, 510 char *buf) 511 { 512 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 513 514 return sysfs_emit(buf, "%llu\n", 515 fs_info->discard_ctl.discard_extent_bytes); 516 } 517 BTRFS_ATTR(discard, discard_extent_bytes, btrfs_discard_extent_bytes_show); 518 519 static ssize_t btrfs_discard_iops_limit_show(struct kobject *kobj, 520 struct kobj_attribute *a, 521 char *buf) 522 { 523 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 524 525 return sysfs_emit(buf, "%u\n", 526 READ_ONCE(fs_info->discard_ctl.iops_limit)); 527 } 528 529 static ssize_t btrfs_discard_iops_limit_store(struct kobject *kobj, 530 struct kobj_attribute *a, 531 const char *buf, size_t len) 532 { 533 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 534 struct btrfs_discard_ctl *discard_ctl = &fs_info->discard_ctl; 535 u32 iops_limit; 536 int ret; 537 538 ret = kstrtou32(buf, 10, &iops_limit); 539 if (ret) 540 return -EINVAL; 541 542 WRITE_ONCE(discard_ctl->iops_limit, iops_limit); 543 btrfs_discard_calc_delay(discard_ctl); 544 btrfs_discard_schedule_work(discard_ctl, true); 545 return len; 546 } 547 BTRFS_ATTR_RW(discard, iops_limit, btrfs_discard_iops_limit_show, 548 btrfs_discard_iops_limit_store); 549 550 static ssize_t btrfs_discard_kbps_limit_show(struct kobject *kobj, 551 struct kobj_attribute *a, 552 char *buf) 553 { 554 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 555 556 return sysfs_emit(buf, "%u\n", 557 READ_ONCE(fs_info->discard_ctl.kbps_limit)); 558 } 559 560 static ssize_t btrfs_discard_kbps_limit_store(struct kobject *kobj, 561 struct kobj_attribute *a, 562 const char *buf, size_t len) 563 { 564 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 565 struct btrfs_discard_ctl *discard_ctl = &fs_info->discard_ctl; 566 u32 kbps_limit; 567 int ret; 568 569 ret = kstrtou32(buf, 10, &kbps_limit); 570 if (ret) 571 return -EINVAL; 572 573 WRITE_ONCE(discard_ctl->kbps_limit, kbps_limit); 574 btrfs_discard_schedule_work(discard_ctl, true); 575 return len; 576 } 577 BTRFS_ATTR_RW(discard, kbps_limit, btrfs_discard_kbps_limit_show, 578 btrfs_discard_kbps_limit_store); 579 580 static ssize_t btrfs_discard_max_discard_size_show(struct kobject *kobj, 581 struct kobj_attribute *a, 582 char *buf) 583 { 584 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 585 586 return sysfs_emit(buf, "%llu\n", 587 READ_ONCE(fs_info->discard_ctl.max_discard_size)); 588 } 589 590 static ssize_t btrfs_discard_max_discard_size_store(struct kobject *kobj, 591 struct kobj_attribute *a, 592 const char *buf, size_t len) 593 { 594 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 595 struct btrfs_discard_ctl *discard_ctl = &fs_info->discard_ctl; 596 u64 max_discard_size; 597 int ret; 598 599 ret = kstrtou64(buf, 10, &max_discard_size); 600 if (ret) 601 return -EINVAL; 602 603 WRITE_ONCE(discard_ctl->max_discard_size, max_discard_size); 604 605 return len; 606 } 607 BTRFS_ATTR_RW(discard, max_discard_size, btrfs_discard_max_discard_size_show, 608 btrfs_discard_max_discard_size_store); 609 610 /* 611 * Per-filesystem stats for discard (when mounted with discard=async). 612 * 613 * Path: /sys/fs/btrfs/<uuid>/discard/ 614 */ 615 static const struct attribute *discard_attrs[] = { 616 BTRFS_ATTR_PTR(discard, discardable_bytes), 617 BTRFS_ATTR_PTR(discard, discardable_extents), 618 BTRFS_ATTR_PTR(discard, discard_bitmap_bytes), 619 BTRFS_ATTR_PTR(discard, discard_bytes_saved), 620 BTRFS_ATTR_PTR(discard, discard_extent_bytes), 621 BTRFS_ATTR_PTR(discard, iops_limit), 622 BTRFS_ATTR_PTR(discard, kbps_limit), 623 BTRFS_ATTR_PTR(discard, max_discard_size), 624 NULL, 625 }; 626 627 #ifdef CONFIG_BTRFS_DEBUG 628 629 /* 630 * Per-filesystem runtime debugging exported via sysfs. 631 * 632 * Path: /sys/fs/btrfs/UUID/debug/ 633 */ 634 static const struct attribute *btrfs_debug_mount_attrs[] = { 635 NULL, 636 }; 637 638 /* 639 * Runtime debugging exported via sysfs, applies to all mounted filesystems. 640 * 641 * Path: /sys/fs/btrfs/debug 642 */ 643 static struct attribute *btrfs_debug_feature_attrs[] = { 644 NULL 645 }; 646 647 static const struct attribute_group btrfs_debug_feature_attr_group = { 648 .name = "debug", 649 .attrs = btrfs_debug_feature_attrs, 650 }; 651 652 #endif 653 654 static ssize_t btrfs_show_u64(u64 *value_ptr, spinlock_t *lock, char *buf) 655 { 656 u64 val; 657 if (lock) 658 spin_lock(lock); 659 val = *value_ptr; 660 if (lock) 661 spin_unlock(lock); 662 return sysfs_emit(buf, "%llu\n", val); 663 } 664 665 static ssize_t global_rsv_size_show(struct kobject *kobj, 666 struct kobj_attribute *ka, char *buf) 667 { 668 struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); 669 struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 670 return btrfs_show_u64(&block_rsv->size, &block_rsv->lock, buf); 671 } 672 BTRFS_ATTR(allocation, global_rsv_size, global_rsv_size_show); 673 674 static ssize_t global_rsv_reserved_show(struct kobject *kobj, 675 struct kobj_attribute *a, char *buf) 676 { 677 struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); 678 struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 679 return btrfs_show_u64(&block_rsv->reserved, &block_rsv->lock, buf); 680 } 681 BTRFS_ATTR(allocation, global_rsv_reserved, global_rsv_reserved_show); 682 683 #define to_space_info(_kobj) container_of(_kobj, struct btrfs_space_info, kobj) 684 #define to_raid_kobj(_kobj) container_of(_kobj, struct raid_kobject, kobj) 685 686 static ssize_t raid_bytes_show(struct kobject *kobj, 687 struct kobj_attribute *attr, char *buf); 688 BTRFS_ATTR(raid, total_bytes, raid_bytes_show); 689 BTRFS_ATTR(raid, used_bytes, raid_bytes_show); 690 691 static ssize_t raid_bytes_show(struct kobject *kobj, 692 struct kobj_attribute *attr, char *buf) 693 694 { 695 struct btrfs_space_info *sinfo = to_space_info(kobj->parent); 696 struct btrfs_block_group *block_group; 697 int index = btrfs_bg_flags_to_raid_index(to_raid_kobj(kobj)->flags); 698 u64 val = 0; 699 700 down_read(&sinfo->groups_sem); 701 list_for_each_entry(block_group, &sinfo->block_groups[index], list) { 702 if (&attr->attr == BTRFS_ATTR_PTR(raid, total_bytes)) 703 val += block_group->length; 704 else 705 val += block_group->used; 706 } 707 up_read(&sinfo->groups_sem); 708 return sysfs_emit(buf, "%llu\n", val); 709 } 710 711 /* 712 * Allocation information about block group profiles. 713 * 714 * Path: /sys/fs/btrfs/<uuid>/allocation/<bg-type>/<bg-profile>/ 715 */ 716 static struct attribute *raid_attrs[] = { 717 BTRFS_ATTR_PTR(raid, total_bytes), 718 BTRFS_ATTR_PTR(raid, used_bytes), 719 NULL 720 }; 721 ATTRIBUTE_GROUPS(raid); 722 723 static void release_raid_kobj(struct kobject *kobj) 724 { 725 kfree(to_raid_kobj(kobj)); 726 } 727 728 static const struct kobj_type btrfs_raid_ktype = { 729 .sysfs_ops = &kobj_sysfs_ops, 730 .release = release_raid_kobj, 731 .default_groups = raid_groups, 732 }; 733 734 #define SPACE_INFO_ATTR(field) \ 735 static ssize_t btrfs_space_info_show_##field(struct kobject *kobj, \ 736 struct kobj_attribute *a, \ 737 char *buf) \ 738 { \ 739 struct btrfs_space_info *sinfo = to_space_info(kobj); \ 740 return btrfs_show_u64(&sinfo->field, &sinfo->lock, buf); \ 741 } \ 742 BTRFS_ATTR(space_info, field, btrfs_space_info_show_##field) 743 744 static ssize_t btrfs_chunk_size_show(struct kobject *kobj, 745 struct kobj_attribute *a, char *buf) 746 { 747 struct btrfs_space_info *sinfo = to_space_info(kobj); 748 749 return sysfs_emit(buf, "%llu\n", READ_ONCE(sinfo->chunk_size)); 750 } 751 752 /* 753 * Store new chunk size in space info. Can be called on a read-only filesystem. 754 * 755 * If the new chunk size value is larger than 10% of free space it is reduced 756 * to match that limit. Alignment must be to 256M and the system chunk size 757 * cannot be set. 758 */ 759 static ssize_t btrfs_chunk_size_store(struct kobject *kobj, 760 struct kobj_attribute *a, 761 const char *buf, size_t len) 762 { 763 struct btrfs_space_info *space_info = to_space_info(kobj); 764 struct btrfs_fs_info *fs_info = to_fs_info(get_btrfs_kobj(kobj)); 765 char *retptr; 766 u64 val; 767 768 if (!capable(CAP_SYS_ADMIN)) 769 return -EPERM; 770 771 if (!fs_info->fs_devices) 772 return -EINVAL; 773 774 if (btrfs_is_zoned(fs_info)) 775 return -EINVAL; 776 777 /* System block type must not be changed. */ 778 if (space_info->flags & BTRFS_BLOCK_GROUP_SYSTEM) 779 return -EPERM; 780 781 val = memparse(buf, &retptr); 782 /* There could be trailing '\n', also catch any typos after the value */ 783 retptr = skip_spaces(retptr); 784 if (*retptr != 0 || val == 0) 785 return -EINVAL; 786 787 val = min(val, BTRFS_MAX_DATA_CHUNK_SIZE); 788 789 /* Limit stripe size to 10% of available space. */ 790 val = min(mult_perc(fs_info->fs_devices->total_rw_bytes, 10), val); 791 792 /* Must be multiple of 256M. */ 793 val &= ~((u64)SZ_256M - 1); 794 795 /* Must be at least 256M. */ 796 if (val < SZ_256M) 797 return -EINVAL; 798 799 btrfs_update_space_info_chunk_size(space_info, val); 800 801 return len; 802 } 803 804 static ssize_t btrfs_size_classes_show(struct kobject *kobj, 805 struct kobj_attribute *a, char *buf) 806 { 807 struct btrfs_space_info *sinfo = to_space_info(kobj); 808 struct btrfs_block_group *bg; 809 u32 none = 0; 810 u32 small = 0; 811 u32 medium = 0; 812 u32 large = 0; 813 814 for (int i = 0; i < BTRFS_NR_RAID_TYPES; ++i) { 815 down_read(&sinfo->groups_sem); 816 list_for_each_entry(bg, &sinfo->block_groups[i], list) { 817 if (!btrfs_block_group_should_use_size_class(bg)) 818 continue; 819 switch (bg->size_class) { 820 case BTRFS_BG_SZ_NONE: 821 none++; 822 break; 823 case BTRFS_BG_SZ_SMALL: 824 small++; 825 break; 826 case BTRFS_BG_SZ_MEDIUM: 827 medium++; 828 break; 829 case BTRFS_BG_SZ_LARGE: 830 large++; 831 break; 832 } 833 } 834 up_read(&sinfo->groups_sem); 835 } 836 return sysfs_emit(buf, "none %u\n" 837 "small %u\n" 838 "medium %u\n" 839 "large %u\n", 840 none, small, medium, large); 841 } 842 843 #ifdef CONFIG_BTRFS_DEBUG 844 /* 845 * Request chunk allocation with current chunk size. 846 */ 847 static ssize_t btrfs_force_chunk_alloc_store(struct kobject *kobj, 848 struct kobj_attribute *a, 849 const char *buf, size_t len) 850 { 851 struct btrfs_space_info *space_info = to_space_info(kobj); 852 struct btrfs_fs_info *fs_info = to_fs_info(get_btrfs_kobj(kobj)); 853 struct btrfs_trans_handle *trans; 854 bool val; 855 int ret; 856 857 if (!capable(CAP_SYS_ADMIN)) 858 return -EPERM; 859 860 if (sb_rdonly(fs_info->sb)) 861 return -EROFS; 862 863 ret = kstrtobool(buf, &val); 864 if (ret) 865 return ret; 866 867 if (!val) 868 return -EINVAL; 869 870 /* 871 * This is unsafe to be called from sysfs context and may cause 872 * unexpected problems. 873 */ 874 trans = btrfs_start_transaction(fs_info->tree_root, 0); 875 if (IS_ERR(trans)) 876 return PTR_ERR(trans); 877 ret = btrfs_force_chunk_alloc(trans, space_info->flags); 878 btrfs_end_transaction(trans); 879 880 if (ret == 1) 881 return len; 882 883 return -ENOSPC; 884 } 885 BTRFS_ATTR_W(space_info, force_chunk_alloc, btrfs_force_chunk_alloc_store); 886 887 #endif 888 889 SPACE_INFO_ATTR(flags); 890 SPACE_INFO_ATTR(total_bytes); 891 SPACE_INFO_ATTR(bytes_used); 892 SPACE_INFO_ATTR(bytes_pinned); 893 SPACE_INFO_ATTR(bytes_reserved); 894 SPACE_INFO_ATTR(bytes_may_use); 895 SPACE_INFO_ATTR(bytes_readonly); 896 SPACE_INFO_ATTR(bytes_zone_unusable); 897 SPACE_INFO_ATTR(disk_used); 898 SPACE_INFO_ATTR(disk_total); 899 SPACE_INFO_ATTR(reclaim_count); 900 SPACE_INFO_ATTR(reclaim_bytes); 901 SPACE_INFO_ATTR(reclaim_errors); 902 BTRFS_ATTR_RW(space_info, chunk_size, btrfs_chunk_size_show, btrfs_chunk_size_store); 903 BTRFS_ATTR(space_info, size_classes, btrfs_size_classes_show); 904 905 static ssize_t btrfs_sinfo_bg_reclaim_threshold_show(struct kobject *kobj, 906 struct kobj_attribute *a, 907 char *buf) 908 { 909 struct btrfs_space_info *space_info = to_space_info(kobj); 910 ssize_t ret; 911 912 spin_lock(&space_info->lock); 913 ret = sysfs_emit(buf, "%d\n", btrfs_calc_reclaim_threshold(space_info)); 914 spin_unlock(&space_info->lock); 915 return ret; 916 } 917 918 static ssize_t btrfs_sinfo_bg_reclaim_threshold_store(struct kobject *kobj, 919 struct kobj_attribute *a, 920 const char *buf, size_t len) 921 { 922 struct btrfs_space_info *space_info = to_space_info(kobj); 923 int thresh; 924 int ret; 925 926 if (READ_ONCE(space_info->dynamic_reclaim)) 927 return -EINVAL; 928 929 ret = kstrtoint(buf, 10, &thresh); 930 if (ret) 931 return ret; 932 933 if (thresh < 0 || thresh > 100) 934 return -EINVAL; 935 936 WRITE_ONCE(space_info->bg_reclaim_threshold, thresh); 937 938 return len; 939 } 940 941 BTRFS_ATTR_RW(space_info, bg_reclaim_threshold, 942 btrfs_sinfo_bg_reclaim_threshold_show, 943 btrfs_sinfo_bg_reclaim_threshold_store); 944 945 static ssize_t btrfs_sinfo_dynamic_reclaim_show(struct kobject *kobj, 946 struct kobj_attribute *a, 947 char *buf) 948 { 949 struct btrfs_space_info *space_info = to_space_info(kobj); 950 951 return sysfs_emit(buf, "%d\n", READ_ONCE(space_info->dynamic_reclaim)); 952 } 953 954 static ssize_t btrfs_sinfo_dynamic_reclaim_store(struct kobject *kobj, 955 struct kobj_attribute *a, 956 const char *buf, size_t len) 957 { 958 struct btrfs_space_info *space_info = to_space_info(kobj); 959 int dynamic_reclaim; 960 int ret; 961 962 ret = kstrtoint(buf, 10, &dynamic_reclaim); 963 if (ret) 964 return ret; 965 966 if (dynamic_reclaim < 0) 967 return -EINVAL; 968 969 WRITE_ONCE(space_info->dynamic_reclaim, dynamic_reclaim != 0); 970 971 return len; 972 } 973 974 BTRFS_ATTR_RW(space_info, dynamic_reclaim, 975 btrfs_sinfo_dynamic_reclaim_show, 976 btrfs_sinfo_dynamic_reclaim_store); 977 978 static ssize_t btrfs_sinfo_periodic_reclaim_show(struct kobject *kobj, 979 struct kobj_attribute *a, 980 char *buf) 981 { 982 struct btrfs_space_info *space_info = to_space_info(kobj); 983 984 return sysfs_emit(buf, "%d\n", READ_ONCE(space_info->periodic_reclaim)); 985 } 986 987 static ssize_t btrfs_sinfo_periodic_reclaim_store(struct kobject *kobj, 988 struct kobj_attribute *a, 989 const char *buf, size_t len) 990 { 991 struct btrfs_space_info *space_info = to_space_info(kobj); 992 int periodic_reclaim; 993 int ret; 994 995 ret = kstrtoint(buf, 10, &periodic_reclaim); 996 if (ret) 997 return ret; 998 999 if (periodic_reclaim < 0) 1000 return -EINVAL; 1001 1002 WRITE_ONCE(space_info->periodic_reclaim, periodic_reclaim != 0); 1003 1004 return len; 1005 } 1006 1007 BTRFS_ATTR_RW(space_info, periodic_reclaim, 1008 btrfs_sinfo_periodic_reclaim_show, 1009 btrfs_sinfo_periodic_reclaim_store); 1010 1011 /* 1012 * Allocation information about block group types. 1013 * 1014 * Path: /sys/fs/btrfs/<uuid>/allocation/<bg-type>/ 1015 */ 1016 static struct attribute *space_info_attrs[] = { 1017 BTRFS_ATTR_PTR(space_info, flags), 1018 BTRFS_ATTR_PTR(space_info, total_bytes), 1019 BTRFS_ATTR_PTR(space_info, bytes_used), 1020 BTRFS_ATTR_PTR(space_info, bytes_pinned), 1021 BTRFS_ATTR_PTR(space_info, bytes_reserved), 1022 BTRFS_ATTR_PTR(space_info, bytes_may_use), 1023 BTRFS_ATTR_PTR(space_info, bytes_readonly), 1024 BTRFS_ATTR_PTR(space_info, bytes_zone_unusable), 1025 BTRFS_ATTR_PTR(space_info, disk_used), 1026 BTRFS_ATTR_PTR(space_info, disk_total), 1027 BTRFS_ATTR_PTR(space_info, bg_reclaim_threshold), 1028 BTRFS_ATTR_PTR(space_info, dynamic_reclaim), 1029 BTRFS_ATTR_PTR(space_info, chunk_size), 1030 BTRFS_ATTR_PTR(space_info, size_classes), 1031 BTRFS_ATTR_PTR(space_info, reclaim_count), 1032 BTRFS_ATTR_PTR(space_info, reclaim_bytes), 1033 BTRFS_ATTR_PTR(space_info, reclaim_errors), 1034 BTRFS_ATTR_PTR(space_info, periodic_reclaim), 1035 #ifdef CONFIG_BTRFS_DEBUG 1036 BTRFS_ATTR_PTR(space_info, force_chunk_alloc), 1037 #endif 1038 NULL, 1039 }; 1040 ATTRIBUTE_GROUPS(space_info); 1041 1042 static void space_info_release(struct kobject *kobj) 1043 { 1044 struct btrfs_space_info *sinfo = to_space_info(kobj); 1045 kfree(sinfo); 1046 } 1047 1048 static const struct kobj_type space_info_ktype = { 1049 .sysfs_ops = &kobj_sysfs_ops, 1050 .release = space_info_release, 1051 .default_groups = space_info_groups, 1052 }; 1053 1054 /* 1055 * Allocation information about block groups. 1056 * 1057 * Path: /sys/fs/btrfs/<uuid>/allocation/ 1058 */ 1059 static const struct attribute *allocation_attrs[] = { 1060 BTRFS_ATTR_PTR(allocation, global_rsv_reserved), 1061 BTRFS_ATTR_PTR(allocation, global_rsv_size), 1062 NULL, 1063 }; 1064 1065 static ssize_t btrfs_label_show(struct kobject *kobj, 1066 struct kobj_attribute *a, char *buf) 1067 { 1068 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 1069 char *label = fs_info->super_copy->label; 1070 ssize_t ret; 1071 1072 spin_lock(&fs_info->super_lock); 1073 ret = sysfs_emit(buf, label[0] ? "%s\n" : "%s", label); 1074 spin_unlock(&fs_info->super_lock); 1075 1076 return ret; 1077 } 1078 1079 static ssize_t btrfs_label_store(struct kobject *kobj, 1080 struct kobj_attribute *a, 1081 const char *buf, size_t len) 1082 { 1083 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 1084 size_t p_len; 1085 1086 if (!fs_info) 1087 return -EPERM; 1088 1089 if (sb_rdonly(fs_info->sb)) 1090 return -EROFS; 1091 1092 /* 1093 * p_len is the len until the first occurrence of either 1094 * '\n' or '\0' 1095 */ 1096 p_len = strcspn(buf, "\n"); 1097 1098 if (p_len >= BTRFS_LABEL_SIZE) 1099 return -EINVAL; 1100 1101 spin_lock(&fs_info->super_lock); 1102 memset(fs_info->super_copy->label, 0, BTRFS_LABEL_SIZE); 1103 memcpy(fs_info->super_copy->label, buf, p_len); 1104 spin_unlock(&fs_info->super_lock); 1105 1106 /* 1107 * We don't want to do full transaction commit from inside sysfs 1108 */ 1109 set_bit(BTRFS_FS_NEED_TRANS_COMMIT, &fs_info->flags); 1110 wake_up_process(fs_info->transaction_kthread); 1111 1112 return len; 1113 } 1114 BTRFS_ATTR_RW(, label, btrfs_label_show, btrfs_label_store); 1115 1116 static ssize_t btrfs_nodesize_show(struct kobject *kobj, 1117 struct kobj_attribute *a, char *buf) 1118 { 1119 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 1120 1121 return sysfs_emit(buf, "%u\n", fs_info->super_copy->nodesize); 1122 } 1123 1124 BTRFS_ATTR(, nodesize, btrfs_nodesize_show); 1125 1126 static ssize_t btrfs_sectorsize_show(struct kobject *kobj, 1127 struct kobj_attribute *a, char *buf) 1128 { 1129 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 1130 1131 return sysfs_emit(buf, "%u\n", fs_info->super_copy->sectorsize); 1132 } 1133 1134 BTRFS_ATTR(, sectorsize, btrfs_sectorsize_show); 1135 1136 static ssize_t btrfs_commit_stats_show(struct kobject *kobj, 1137 struct kobj_attribute *a, char *buf) 1138 { 1139 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 1140 1141 return sysfs_emit(buf, 1142 "commits %llu\n" 1143 "last_commit_ms %llu\n" 1144 "max_commit_ms %llu\n" 1145 "total_commit_ms %llu\n", 1146 fs_info->commit_stats.commit_count, 1147 div_u64(fs_info->commit_stats.last_commit_dur, NSEC_PER_MSEC), 1148 div_u64(fs_info->commit_stats.max_commit_dur, NSEC_PER_MSEC), 1149 div_u64(fs_info->commit_stats.total_commit_dur, NSEC_PER_MSEC)); 1150 } 1151 1152 static ssize_t btrfs_commit_stats_store(struct kobject *kobj, 1153 struct kobj_attribute *a, 1154 const char *buf, size_t len) 1155 { 1156 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 1157 unsigned long val; 1158 int ret; 1159 1160 if (!fs_info) 1161 return -EPERM; 1162 1163 if (!capable(CAP_SYS_RESOURCE)) 1164 return -EPERM; 1165 1166 ret = kstrtoul(buf, 10, &val); 1167 if (ret) 1168 return ret; 1169 if (val) 1170 return -EINVAL; 1171 1172 WRITE_ONCE(fs_info->commit_stats.max_commit_dur, 0); 1173 1174 return len; 1175 } 1176 BTRFS_ATTR_RW(, commit_stats, btrfs_commit_stats_show, btrfs_commit_stats_store); 1177 1178 static ssize_t btrfs_clone_alignment_show(struct kobject *kobj, 1179 struct kobj_attribute *a, char *buf) 1180 { 1181 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 1182 1183 return sysfs_emit(buf, "%u\n", fs_info->super_copy->sectorsize); 1184 } 1185 1186 BTRFS_ATTR(, clone_alignment, btrfs_clone_alignment_show); 1187 1188 static ssize_t quota_override_show(struct kobject *kobj, 1189 struct kobj_attribute *a, char *buf) 1190 { 1191 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 1192 int quota_override; 1193 1194 quota_override = test_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags); 1195 return sysfs_emit(buf, "%d\n", quota_override); 1196 } 1197 1198 static ssize_t quota_override_store(struct kobject *kobj, 1199 struct kobj_attribute *a, 1200 const char *buf, size_t len) 1201 { 1202 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 1203 unsigned long knob; 1204 int err; 1205 1206 if (!fs_info) 1207 return -EPERM; 1208 1209 if (!capable(CAP_SYS_RESOURCE)) 1210 return -EPERM; 1211 1212 err = kstrtoul(buf, 10, &knob); 1213 if (err) 1214 return err; 1215 if (knob > 1) 1216 return -EINVAL; 1217 1218 if (knob) 1219 set_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags); 1220 else 1221 clear_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags); 1222 1223 return len; 1224 } 1225 1226 BTRFS_ATTR_RW(, quota_override, quota_override_show, quota_override_store); 1227 1228 static ssize_t btrfs_metadata_uuid_show(struct kobject *kobj, 1229 struct kobj_attribute *a, char *buf) 1230 { 1231 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 1232 1233 return sysfs_emit(buf, "%pU\n", fs_info->fs_devices->metadata_uuid); 1234 } 1235 1236 BTRFS_ATTR(, metadata_uuid, btrfs_metadata_uuid_show); 1237 1238 static ssize_t btrfs_checksum_show(struct kobject *kobj, 1239 struct kobj_attribute *a, char *buf) 1240 { 1241 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 1242 u16 csum_type = btrfs_super_csum_type(fs_info->super_copy); 1243 1244 return sysfs_emit(buf, "%s (%s)\n", 1245 btrfs_super_csum_name(csum_type), 1246 crypto_shash_driver_name(fs_info->csum_shash)); 1247 } 1248 1249 BTRFS_ATTR(, checksum, btrfs_checksum_show); 1250 1251 static ssize_t btrfs_exclusive_operation_show(struct kobject *kobj, 1252 struct kobj_attribute *a, char *buf) 1253 { 1254 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 1255 const char *str; 1256 1257 switch (READ_ONCE(fs_info->exclusive_operation)) { 1258 case BTRFS_EXCLOP_NONE: 1259 str = "none\n"; 1260 break; 1261 case BTRFS_EXCLOP_BALANCE: 1262 str = "balance\n"; 1263 break; 1264 case BTRFS_EXCLOP_BALANCE_PAUSED: 1265 str = "balance paused\n"; 1266 break; 1267 case BTRFS_EXCLOP_DEV_ADD: 1268 str = "device add\n"; 1269 break; 1270 case BTRFS_EXCLOP_DEV_REMOVE: 1271 str = "device remove\n"; 1272 break; 1273 case BTRFS_EXCLOP_DEV_REPLACE: 1274 str = "device replace\n"; 1275 break; 1276 case BTRFS_EXCLOP_RESIZE: 1277 str = "resize\n"; 1278 break; 1279 case BTRFS_EXCLOP_SWAP_ACTIVATE: 1280 str = "swap activate\n"; 1281 break; 1282 default: 1283 str = "UNKNOWN\n"; 1284 break; 1285 } 1286 return sysfs_emit(buf, "%s", str); 1287 } 1288 BTRFS_ATTR(, exclusive_operation, btrfs_exclusive_operation_show); 1289 1290 static ssize_t btrfs_generation_show(struct kobject *kobj, 1291 struct kobj_attribute *a, char *buf) 1292 { 1293 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 1294 1295 return sysfs_emit(buf, "%llu\n", btrfs_get_fs_generation(fs_info)); 1296 } 1297 BTRFS_ATTR(, generation, btrfs_generation_show); 1298 1299 static ssize_t btrfs_temp_fsid_show(struct kobject *kobj, 1300 struct kobj_attribute *a, char *buf) 1301 { 1302 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 1303 1304 return sysfs_emit(buf, "%d\n", fs_info->fs_devices->temp_fsid); 1305 } 1306 BTRFS_ATTR(, temp_fsid, btrfs_temp_fsid_show); 1307 1308 static const char * const btrfs_read_policy_name[] = { "pid" }; 1309 1310 static ssize_t btrfs_read_policy_show(struct kobject *kobj, 1311 struct kobj_attribute *a, char *buf) 1312 { 1313 struct btrfs_fs_devices *fs_devices = to_fs_devs(kobj); 1314 const enum btrfs_read_policy policy = READ_ONCE(fs_devices->read_policy); 1315 ssize_t ret = 0; 1316 int i; 1317 1318 for (i = 0; i < BTRFS_NR_READ_POLICY; i++) { 1319 if (policy == i) 1320 ret += sysfs_emit_at(buf, ret, "%s[%s]", 1321 (ret == 0 ? "" : " "), 1322 btrfs_read_policy_name[i]); 1323 else 1324 ret += sysfs_emit_at(buf, ret, "%s%s", 1325 (ret == 0 ? "" : " "), 1326 btrfs_read_policy_name[i]); 1327 } 1328 1329 ret += sysfs_emit_at(buf, ret, "\n"); 1330 1331 return ret; 1332 } 1333 1334 static ssize_t btrfs_read_policy_store(struct kobject *kobj, 1335 struct kobj_attribute *a, 1336 const char *buf, size_t len) 1337 { 1338 struct btrfs_fs_devices *fs_devices = to_fs_devs(kobj); 1339 int i; 1340 1341 for (i = 0; i < BTRFS_NR_READ_POLICY; i++) { 1342 if (sysfs_streq(buf, btrfs_read_policy_name[i])) { 1343 if (i != READ_ONCE(fs_devices->read_policy)) { 1344 WRITE_ONCE(fs_devices->read_policy, i); 1345 btrfs_info(fs_devices->fs_info, 1346 "read policy set to '%s'", 1347 btrfs_read_policy_name[i]); 1348 } 1349 return len; 1350 } 1351 } 1352 1353 return -EINVAL; 1354 } 1355 BTRFS_ATTR_RW(, read_policy, btrfs_read_policy_show, btrfs_read_policy_store); 1356 1357 static ssize_t btrfs_bg_reclaim_threshold_show(struct kobject *kobj, 1358 struct kobj_attribute *a, 1359 char *buf) 1360 { 1361 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 1362 1363 return sysfs_emit(buf, "%d\n", READ_ONCE(fs_info->bg_reclaim_threshold)); 1364 } 1365 1366 static ssize_t btrfs_bg_reclaim_threshold_store(struct kobject *kobj, 1367 struct kobj_attribute *a, 1368 const char *buf, size_t len) 1369 { 1370 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 1371 int thresh; 1372 int ret; 1373 1374 ret = kstrtoint(buf, 10, &thresh); 1375 if (ret) 1376 return ret; 1377 1378 #ifdef CONFIG_BTRFS_DEBUG 1379 if (thresh != 0 && (thresh > 100)) 1380 return -EINVAL; 1381 #else 1382 if (thresh != 0 && (thresh <= 50 || thresh > 100)) 1383 return -EINVAL; 1384 #endif 1385 1386 WRITE_ONCE(fs_info->bg_reclaim_threshold, thresh); 1387 1388 return len; 1389 } 1390 BTRFS_ATTR_RW(, bg_reclaim_threshold, btrfs_bg_reclaim_threshold_show, 1391 btrfs_bg_reclaim_threshold_store); 1392 1393 #ifdef CONFIG_BTRFS_DEBUG 1394 static ssize_t btrfs_offload_csum_show(struct kobject *kobj, 1395 struct kobj_attribute *a, char *buf) 1396 { 1397 struct btrfs_fs_devices *fs_devices = to_fs_devs(kobj); 1398 1399 switch (READ_ONCE(fs_devices->offload_csum_mode)) { 1400 case BTRFS_OFFLOAD_CSUM_AUTO: 1401 return sysfs_emit(buf, "auto\n"); 1402 case BTRFS_OFFLOAD_CSUM_FORCE_ON: 1403 return sysfs_emit(buf, "1\n"); 1404 case BTRFS_OFFLOAD_CSUM_FORCE_OFF: 1405 return sysfs_emit(buf, "0\n"); 1406 default: 1407 WARN_ON(1); 1408 return -EINVAL; 1409 } 1410 } 1411 1412 static ssize_t btrfs_offload_csum_store(struct kobject *kobj, 1413 struct kobj_attribute *a, const char *buf, 1414 size_t len) 1415 { 1416 struct btrfs_fs_devices *fs_devices = to_fs_devs(kobj); 1417 int ret; 1418 bool val; 1419 1420 ret = kstrtobool(buf, &val); 1421 if (ret == 0) 1422 WRITE_ONCE(fs_devices->offload_csum_mode, 1423 val ? BTRFS_OFFLOAD_CSUM_FORCE_ON : BTRFS_OFFLOAD_CSUM_FORCE_OFF); 1424 else if (ret == -EINVAL && sysfs_streq(buf, "auto")) 1425 WRITE_ONCE(fs_devices->offload_csum_mode, BTRFS_OFFLOAD_CSUM_AUTO); 1426 else 1427 return -EINVAL; 1428 1429 return len; 1430 } 1431 BTRFS_ATTR_RW(, offload_csum, btrfs_offload_csum_show, btrfs_offload_csum_store); 1432 #endif 1433 1434 /* 1435 * Per-filesystem information and stats. 1436 * 1437 * Path: /sys/fs/btrfs/<uuid>/ 1438 */ 1439 static const struct attribute *btrfs_attrs[] = { 1440 BTRFS_ATTR_PTR(, label), 1441 BTRFS_ATTR_PTR(, nodesize), 1442 BTRFS_ATTR_PTR(, sectorsize), 1443 BTRFS_ATTR_PTR(, clone_alignment), 1444 BTRFS_ATTR_PTR(, quota_override), 1445 BTRFS_ATTR_PTR(, metadata_uuid), 1446 BTRFS_ATTR_PTR(, checksum), 1447 BTRFS_ATTR_PTR(, exclusive_operation), 1448 BTRFS_ATTR_PTR(, generation), 1449 BTRFS_ATTR_PTR(, read_policy), 1450 BTRFS_ATTR_PTR(, bg_reclaim_threshold), 1451 BTRFS_ATTR_PTR(, commit_stats), 1452 BTRFS_ATTR_PTR(, temp_fsid), 1453 #ifdef CONFIG_BTRFS_DEBUG 1454 BTRFS_ATTR_PTR(, offload_csum), 1455 #endif 1456 NULL, 1457 }; 1458 1459 static void btrfs_release_fsid_kobj(struct kobject *kobj) 1460 { 1461 struct btrfs_fs_devices *fs_devs = to_fs_devs(kobj); 1462 1463 memset(&fs_devs->fsid_kobj, 0, sizeof(struct kobject)); 1464 complete(&fs_devs->kobj_unregister); 1465 } 1466 1467 static const struct kobj_type btrfs_ktype = { 1468 .sysfs_ops = &kobj_sysfs_ops, 1469 .release = btrfs_release_fsid_kobj, 1470 }; 1471 1472 static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj) 1473 { 1474 if (kobj->ktype != &btrfs_ktype) 1475 return NULL; 1476 return container_of(kobj, struct btrfs_fs_devices, fsid_kobj); 1477 } 1478 1479 static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj) 1480 { 1481 if (kobj->ktype != &btrfs_ktype) 1482 return NULL; 1483 return to_fs_devs(kobj)->fs_info; 1484 } 1485 1486 static struct kobject *get_btrfs_kobj(struct kobject *kobj) 1487 { 1488 while (kobj) { 1489 if (kobj->ktype == &btrfs_ktype) 1490 return kobj; 1491 kobj = kobj->parent; 1492 } 1493 return NULL; 1494 } 1495 1496 #define NUM_FEATURE_BITS 64 1497 #define BTRFS_FEATURE_NAME_MAX 13 1498 static char btrfs_unknown_feature_names[FEAT_MAX][NUM_FEATURE_BITS][BTRFS_FEATURE_NAME_MAX]; 1499 static struct btrfs_feature_attr btrfs_feature_attrs[FEAT_MAX][NUM_FEATURE_BITS]; 1500 1501 static_assert(ARRAY_SIZE(btrfs_unknown_feature_names) == 1502 ARRAY_SIZE(btrfs_feature_attrs)); 1503 static_assert(ARRAY_SIZE(btrfs_unknown_feature_names[0]) == 1504 ARRAY_SIZE(btrfs_feature_attrs[0])); 1505 1506 static const u64 supported_feature_masks[FEAT_MAX] = { 1507 [FEAT_COMPAT] = BTRFS_FEATURE_COMPAT_SUPP, 1508 [FEAT_COMPAT_RO] = BTRFS_FEATURE_COMPAT_RO_SUPP, 1509 [FEAT_INCOMPAT] = BTRFS_FEATURE_INCOMPAT_SUPP, 1510 }; 1511 1512 static int addrm_unknown_feature_attrs(struct btrfs_fs_info *fs_info, bool add) 1513 { 1514 int set; 1515 1516 for (set = 0; set < FEAT_MAX; set++) { 1517 int i; 1518 struct attribute *attrs[2]; 1519 struct attribute_group agroup = { 1520 .name = "features", 1521 .attrs = attrs, 1522 }; 1523 u64 features = get_features(fs_info, set); 1524 features &= ~supported_feature_masks[set]; 1525 1526 if (!features) 1527 continue; 1528 1529 attrs[1] = NULL; 1530 for (i = 0; i < NUM_FEATURE_BITS; i++) { 1531 struct btrfs_feature_attr *fa; 1532 1533 if (!(features & (1ULL << i))) 1534 continue; 1535 1536 fa = &btrfs_feature_attrs[set][i]; 1537 attrs[0] = &fa->kobj_attr.attr; 1538 if (add) { 1539 int ret; 1540 ret = sysfs_merge_group(&fs_info->fs_devices->fsid_kobj, 1541 &agroup); 1542 if (ret) 1543 return ret; 1544 } else 1545 sysfs_unmerge_group(&fs_info->fs_devices->fsid_kobj, 1546 &agroup); 1547 } 1548 1549 } 1550 return 0; 1551 } 1552 1553 static void __btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs) 1554 { 1555 if (fs_devs->devinfo_kobj) { 1556 kobject_del(fs_devs->devinfo_kobj); 1557 kobject_put(fs_devs->devinfo_kobj); 1558 fs_devs->devinfo_kobj = NULL; 1559 } 1560 1561 if (fs_devs->devices_kobj) { 1562 kobject_del(fs_devs->devices_kobj); 1563 kobject_put(fs_devs->devices_kobj); 1564 fs_devs->devices_kobj = NULL; 1565 } 1566 1567 if (fs_devs->fsid_kobj.state_initialized) { 1568 kobject_del(&fs_devs->fsid_kobj); 1569 kobject_put(&fs_devs->fsid_kobj); 1570 wait_for_completion(&fs_devs->kobj_unregister); 1571 } 1572 } 1573 1574 /* when fs_devs is NULL it will remove all fsid kobject */ 1575 void btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs) 1576 { 1577 struct list_head *fs_uuids = btrfs_get_fs_uuids(); 1578 1579 if (fs_devs) { 1580 __btrfs_sysfs_remove_fsid(fs_devs); 1581 return; 1582 } 1583 1584 list_for_each_entry(fs_devs, fs_uuids, fs_list) { 1585 __btrfs_sysfs_remove_fsid(fs_devs); 1586 } 1587 } 1588 1589 static void btrfs_sysfs_remove_fs_devices(struct btrfs_fs_devices *fs_devices) 1590 { 1591 struct btrfs_device *device; 1592 struct btrfs_fs_devices *seed; 1593 1594 list_for_each_entry(device, &fs_devices->devices, dev_list) 1595 btrfs_sysfs_remove_device(device); 1596 1597 list_for_each_entry(seed, &fs_devices->seed_list, seed_list) { 1598 list_for_each_entry(device, &seed->devices, dev_list) 1599 btrfs_sysfs_remove_device(device); 1600 } 1601 } 1602 1603 void btrfs_sysfs_remove_mounted(struct btrfs_fs_info *fs_info) 1604 { 1605 struct kobject *fsid_kobj = &fs_info->fs_devices->fsid_kobj; 1606 1607 sysfs_remove_link(fsid_kobj, "bdi"); 1608 1609 if (fs_info->space_info_kobj) { 1610 sysfs_remove_files(fs_info->space_info_kobj, allocation_attrs); 1611 kobject_del(fs_info->space_info_kobj); 1612 kobject_put(fs_info->space_info_kobj); 1613 } 1614 if (fs_info->discard_kobj) { 1615 sysfs_remove_files(fs_info->discard_kobj, discard_attrs); 1616 kobject_del(fs_info->discard_kobj); 1617 kobject_put(fs_info->discard_kobj); 1618 } 1619 #ifdef CONFIG_BTRFS_DEBUG 1620 if (fs_info->debug_kobj) { 1621 sysfs_remove_files(fs_info->debug_kobj, btrfs_debug_mount_attrs); 1622 kobject_del(fs_info->debug_kobj); 1623 kobject_put(fs_info->debug_kobj); 1624 } 1625 #endif 1626 addrm_unknown_feature_attrs(fs_info, false); 1627 sysfs_remove_group(fsid_kobj, &btrfs_feature_attr_group); 1628 sysfs_remove_files(fsid_kobj, btrfs_attrs); 1629 btrfs_sysfs_remove_fs_devices(fs_info->fs_devices); 1630 } 1631 1632 static const char * const btrfs_feature_set_names[FEAT_MAX] = { 1633 [FEAT_COMPAT] = "compat", 1634 [FEAT_COMPAT_RO] = "compat_ro", 1635 [FEAT_INCOMPAT] = "incompat", 1636 }; 1637 1638 const char *btrfs_feature_set_name(enum btrfs_feature_set set) 1639 { 1640 return btrfs_feature_set_names[set]; 1641 } 1642 1643 char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags) 1644 { 1645 size_t bufsize = 4096; /* safe max, 64 names * 64 bytes */ 1646 int len = 0; 1647 int i; 1648 char *str; 1649 1650 str = kmalloc(bufsize, GFP_KERNEL); 1651 if (!str) 1652 return str; 1653 1654 for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { 1655 const char *name; 1656 1657 if (!(flags & (1ULL << i))) 1658 continue; 1659 1660 name = btrfs_feature_attrs[set][i].kobj_attr.attr.name; 1661 len += scnprintf(str + len, bufsize - len, "%s%s", 1662 len ? "," : "", name); 1663 } 1664 1665 return str; 1666 } 1667 1668 static void init_feature_attrs(void) 1669 { 1670 struct btrfs_feature_attr *fa; 1671 int set, i; 1672 1673 memset(btrfs_feature_attrs, 0, sizeof(btrfs_feature_attrs)); 1674 memset(btrfs_unknown_feature_names, 0, 1675 sizeof(btrfs_unknown_feature_names)); 1676 1677 for (i = 0; btrfs_supported_feature_attrs[i]; i++) { 1678 struct btrfs_feature_attr *sfa; 1679 struct attribute *a = btrfs_supported_feature_attrs[i]; 1680 int bit; 1681 sfa = attr_to_btrfs_feature_attr(a); 1682 bit = ilog2(sfa->feature_bit); 1683 fa = &btrfs_feature_attrs[sfa->feature_set][bit]; 1684 1685 fa->kobj_attr.attr.name = sfa->kobj_attr.attr.name; 1686 } 1687 1688 for (set = 0; set < FEAT_MAX; set++) { 1689 for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { 1690 char *name = btrfs_unknown_feature_names[set][i]; 1691 fa = &btrfs_feature_attrs[set][i]; 1692 1693 if (fa->kobj_attr.attr.name) 1694 continue; 1695 1696 snprintf(name, BTRFS_FEATURE_NAME_MAX, "%s:%u", 1697 btrfs_feature_set_names[set], i); 1698 1699 fa->kobj_attr.attr.name = name; 1700 fa->kobj_attr.attr.mode = S_IRUGO; 1701 fa->feature_set = set; 1702 fa->feature_bit = 1ULL << i; 1703 } 1704 } 1705 } 1706 1707 /* 1708 * Create a sysfs entry for a given block group type at path 1709 * /sys/fs/btrfs/UUID/allocation/data/TYPE 1710 */ 1711 void btrfs_sysfs_add_block_group_type(struct btrfs_block_group *cache) 1712 { 1713 struct btrfs_fs_info *fs_info = cache->fs_info; 1714 struct btrfs_space_info *space_info = cache->space_info; 1715 struct raid_kobject *rkobj; 1716 const int index = btrfs_bg_flags_to_raid_index(cache->flags); 1717 unsigned int nofs_flag; 1718 int ret; 1719 1720 /* 1721 * Setup a NOFS context because kobject_add(), deep in its call chain, 1722 * does GFP_KERNEL allocations, and we are often called in a context 1723 * where if reclaim is triggered we can deadlock (we are either holding 1724 * a transaction handle or some lock required for a transaction 1725 * commit). 1726 */ 1727 nofs_flag = memalloc_nofs_save(); 1728 1729 rkobj = kzalloc(sizeof(*rkobj), GFP_NOFS); 1730 if (!rkobj) { 1731 memalloc_nofs_restore(nofs_flag); 1732 btrfs_warn(cache->fs_info, 1733 "couldn't alloc memory for raid level kobject"); 1734 return; 1735 } 1736 1737 rkobj->flags = cache->flags; 1738 kobject_init(&rkobj->kobj, &btrfs_raid_ktype); 1739 1740 /* 1741 * We call this either on mount, or if we've created a block group for a 1742 * new index type while running (i.e. when restriping). The running 1743 * case is tricky because we could race with other threads, so we need 1744 * to have this check to make sure we didn't already init the kobject. 1745 * 1746 * We don't have to protect on the free side because it only happens on 1747 * unmount. 1748 */ 1749 spin_lock(&space_info->lock); 1750 if (space_info->block_group_kobjs[index]) { 1751 spin_unlock(&space_info->lock); 1752 kobject_put(&rkobj->kobj); 1753 return; 1754 } else { 1755 space_info->block_group_kobjs[index] = &rkobj->kobj; 1756 } 1757 spin_unlock(&space_info->lock); 1758 1759 ret = kobject_add(&rkobj->kobj, &space_info->kobj, "%s", 1760 btrfs_bg_type_to_raid_name(rkobj->flags)); 1761 memalloc_nofs_restore(nofs_flag); 1762 if (ret) { 1763 spin_lock(&space_info->lock); 1764 space_info->block_group_kobjs[index] = NULL; 1765 spin_unlock(&space_info->lock); 1766 kobject_put(&rkobj->kobj); 1767 btrfs_warn(fs_info, 1768 "failed to add kobject for block cache, ignoring"); 1769 return; 1770 } 1771 } 1772 1773 /* 1774 * Remove sysfs directories for all block group types of a given space info and 1775 * the space info as well 1776 */ 1777 void btrfs_sysfs_remove_space_info(struct btrfs_space_info *space_info) 1778 { 1779 int i; 1780 1781 for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) { 1782 struct kobject *kobj; 1783 1784 kobj = space_info->block_group_kobjs[i]; 1785 space_info->block_group_kobjs[i] = NULL; 1786 if (kobj) { 1787 kobject_del(kobj); 1788 kobject_put(kobj); 1789 } 1790 } 1791 kobject_del(&space_info->kobj); 1792 kobject_put(&space_info->kobj); 1793 } 1794 1795 static const char *alloc_name(u64 flags) 1796 { 1797 switch (flags) { 1798 case BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_DATA: 1799 return "mixed"; 1800 case BTRFS_BLOCK_GROUP_METADATA: 1801 return "metadata"; 1802 case BTRFS_BLOCK_GROUP_DATA: 1803 return "data"; 1804 case BTRFS_BLOCK_GROUP_SYSTEM: 1805 return "system"; 1806 default: 1807 WARN_ON(1); 1808 return "invalid-combination"; 1809 } 1810 } 1811 1812 /* 1813 * Create a sysfs entry for a space info type at path 1814 * /sys/fs/btrfs/UUID/allocation/TYPE 1815 */ 1816 int btrfs_sysfs_add_space_info_type(struct btrfs_fs_info *fs_info, 1817 struct btrfs_space_info *space_info) 1818 { 1819 int ret; 1820 1821 ret = kobject_init_and_add(&space_info->kobj, &space_info_ktype, 1822 fs_info->space_info_kobj, "%s", 1823 alloc_name(space_info->flags)); 1824 if (ret) { 1825 kobject_put(&space_info->kobj); 1826 return ret; 1827 } 1828 1829 return 0; 1830 } 1831 1832 void btrfs_sysfs_remove_device(struct btrfs_device *device) 1833 { 1834 struct kobject *devices_kobj; 1835 1836 /* 1837 * Seed fs_devices devices_kobj aren't used, fetch kobject from the 1838 * fs_info::fs_devices. 1839 */ 1840 devices_kobj = device->fs_info->fs_devices->devices_kobj; 1841 ASSERT(devices_kobj); 1842 1843 if (device->bdev) 1844 sysfs_remove_link(devices_kobj, bdev_kobj(device->bdev)->name); 1845 1846 if (device->devid_kobj.state_initialized) { 1847 kobject_del(&device->devid_kobj); 1848 kobject_put(&device->devid_kobj); 1849 wait_for_completion(&device->kobj_unregister); 1850 } 1851 } 1852 1853 static ssize_t btrfs_devinfo_in_fs_metadata_show(struct kobject *kobj, 1854 struct kobj_attribute *a, 1855 char *buf) 1856 { 1857 int val; 1858 struct btrfs_device *device = container_of(kobj, struct btrfs_device, 1859 devid_kobj); 1860 1861 val = !!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &device->dev_state); 1862 1863 return sysfs_emit(buf, "%d\n", val); 1864 } 1865 BTRFS_ATTR(devid, in_fs_metadata, btrfs_devinfo_in_fs_metadata_show); 1866 1867 static ssize_t btrfs_devinfo_missing_show(struct kobject *kobj, 1868 struct kobj_attribute *a, char *buf) 1869 { 1870 int val; 1871 struct btrfs_device *device = container_of(kobj, struct btrfs_device, 1872 devid_kobj); 1873 1874 val = !!test_bit(BTRFS_DEV_STATE_MISSING, &device->dev_state); 1875 1876 return sysfs_emit(buf, "%d\n", val); 1877 } 1878 BTRFS_ATTR(devid, missing, btrfs_devinfo_missing_show); 1879 1880 static ssize_t btrfs_devinfo_replace_target_show(struct kobject *kobj, 1881 struct kobj_attribute *a, 1882 char *buf) 1883 { 1884 int val; 1885 struct btrfs_device *device = container_of(kobj, struct btrfs_device, 1886 devid_kobj); 1887 1888 val = !!test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state); 1889 1890 return sysfs_emit(buf, "%d\n", val); 1891 } 1892 BTRFS_ATTR(devid, replace_target, btrfs_devinfo_replace_target_show); 1893 1894 static ssize_t btrfs_devinfo_scrub_speed_max_show(struct kobject *kobj, 1895 struct kobj_attribute *a, 1896 char *buf) 1897 { 1898 struct btrfs_device *device = container_of(kobj, struct btrfs_device, 1899 devid_kobj); 1900 1901 return sysfs_emit(buf, "%llu\n", READ_ONCE(device->scrub_speed_max)); 1902 } 1903 1904 static ssize_t btrfs_devinfo_scrub_speed_max_store(struct kobject *kobj, 1905 struct kobj_attribute *a, 1906 const char *buf, size_t len) 1907 { 1908 struct btrfs_device *device = container_of(kobj, struct btrfs_device, 1909 devid_kobj); 1910 char *endptr; 1911 unsigned long long limit; 1912 1913 limit = memparse(buf, &endptr); 1914 /* There could be trailing '\n', also catch any typos after the value. */ 1915 endptr = skip_spaces(endptr); 1916 if (*endptr != 0) 1917 return -EINVAL; 1918 WRITE_ONCE(device->scrub_speed_max, limit); 1919 return len; 1920 } 1921 BTRFS_ATTR_RW(devid, scrub_speed_max, btrfs_devinfo_scrub_speed_max_show, 1922 btrfs_devinfo_scrub_speed_max_store); 1923 1924 static ssize_t btrfs_devinfo_writeable_show(struct kobject *kobj, 1925 struct kobj_attribute *a, char *buf) 1926 { 1927 int val; 1928 struct btrfs_device *device = container_of(kobj, struct btrfs_device, 1929 devid_kobj); 1930 1931 val = !!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state); 1932 1933 return sysfs_emit(buf, "%d\n", val); 1934 } 1935 BTRFS_ATTR(devid, writeable, btrfs_devinfo_writeable_show); 1936 1937 static ssize_t btrfs_devinfo_fsid_show(struct kobject *kobj, 1938 struct kobj_attribute *a, char *buf) 1939 { 1940 struct btrfs_device *device = container_of(kobj, struct btrfs_device, 1941 devid_kobj); 1942 1943 return sysfs_emit(buf, "%pU\n", device->fs_devices->fsid); 1944 } 1945 BTRFS_ATTR(devid, fsid, btrfs_devinfo_fsid_show); 1946 1947 static ssize_t btrfs_devinfo_error_stats_show(struct kobject *kobj, 1948 struct kobj_attribute *a, char *buf) 1949 { 1950 struct btrfs_device *device = container_of(kobj, struct btrfs_device, 1951 devid_kobj); 1952 1953 if (!device->dev_stats_valid) 1954 return sysfs_emit(buf, "invalid\n"); 1955 1956 /* 1957 * Print all at once so we get a snapshot of all values from the same 1958 * time. Keep them in sync and in order of definition of 1959 * btrfs_dev_stat_values. 1960 */ 1961 return sysfs_emit(buf, 1962 "write_errs %d\n" 1963 "read_errs %d\n" 1964 "flush_errs %d\n" 1965 "corruption_errs %d\n" 1966 "generation_errs %d\n", 1967 btrfs_dev_stat_read(device, BTRFS_DEV_STAT_WRITE_ERRS), 1968 btrfs_dev_stat_read(device, BTRFS_DEV_STAT_READ_ERRS), 1969 btrfs_dev_stat_read(device, BTRFS_DEV_STAT_FLUSH_ERRS), 1970 btrfs_dev_stat_read(device, BTRFS_DEV_STAT_CORRUPTION_ERRS), 1971 btrfs_dev_stat_read(device, BTRFS_DEV_STAT_GENERATION_ERRS)); 1972 } 1973 BTRFS_ATTR(devid, error_stats, btrfs_devinfo_error_stats_show); 1974 1975 /* 1976 * Information about one device. 1977 * 1978 * Path: /sys/fs/btrfs/<uuid>/devinfo/<devid>/ 1979 */ 1980 static struct attribute *devid_attrs[] = { 1981 BTRFS_ATTR_PTR(devid, error_stats), 1982 BTRFS_ATTR_PTR(devid, fsid), 1983 BTRFS_ATTR_PTR(devid, in_fs_metadata), 1984 BTRFS_ATTR_PTR(devid, missing), 1985 BTRFS_ATTR_PTR(devid, replace_target), 1986 BTRFS_ATTR_PTR(devid, scrub_speed_max), 1987 BTRFS_ATTR_PTR(devid, writeable), 1988 NULL 1989 }; 1990 ATTRIBUTE_GROUPS(devid); 1991 1992 static void btrfs_release_devid_kobj(struct kobject *kobj) 1993 { 1994 struct btrfs_device *device = container_of(kobj, struct btrfs_device, 1995 devid_kobj); 1996 1997 memset(&device->devid_kobj, 0, sizeof(struct kobject)); 1998 complete(&device->kobj_unregister); 1999 } 2000 2001 static const struct kobj_type devid_ktype = { 2002 .sysfs_ops = &kobj_sysfs_ops, 2003 .default_groups = devid_groups, 2004 .release = btrfs_release_devid_kobj, 2005 }; 2006 2007 int btrfs_sysfs_add_device(struct btrfs_device *device) 2008 { 2009 int ret; 2010 unsigned int nofs_flag; 2011 struct kobject *devices_kobj; 2012 struct kobject *devinfo_kobj; 2013 2014 /* 2015 * Make sure we use the fs_info::fs_devices to fetch the kobjects even 2016 * for the seed fs_devices 2017 */ 2018 devices_kobj = device->fs_info->fs_devices->devices_kobj; 2019 devinfo_kobj = device->fs_info->fs_devices->devinfo_kobj; 2020 ASSERT(devices_kobj); 2021 ASSERT(devinfo_kobj); 2022 2023 nofs_flag = memalloc_nofs_save(); 2024 2025 if (device->bdev) { 2026 struct kobject *disk_kobj = bdev_kobj(device->bdev); 2027 2028 ret = sysfs_create_link(devices_kobj, disk_kobj, disk_kobj->name); 2029 if (ret) { 2030 btrfs_warn(device->fs_info, 2031 "creating sysfs device link for devid %llu failed: %d", 2032 device->devid, ret); 2033 goto out; 2034 } 2035 } 2036 2037 init_completion(&device->kobj_unregister); 2038 ret = kobject_init_and_add(&device->devid_kobj, &devid_ktype, 2039 devinfo_kobj, "%llu", device->devid); 2040 if (ret) { 2041 kobject_put(&device->devid_kobj); 2042 btrfs_warn(device->fs_info, 2043 "devinfo init for devid %llu failed: %d", 2044 device->devid, ret); 2045 } 2046 2047 out: 2048 memalloc_nofs_restore(nofs_flag); 2049 return ret; 2050 } 2051 2052 static int btrfs_sysfs_add_fs_devices(struct btrfs_fs_devices *fs_devices) 2053 { 2054 int ret; 2055 struct btrfs_device *device; 2056 struct btrfs_fs_devices *seed; 2057 2058 list_for_each_entry(device, &fs_devices->devices, dev_list) { 2059 ret = btrfs_sysfs_add_device(device); 2060 if (ret) 2061 goto fail; 2062 } 2063 2064 list_for_each_entry(seed, &fs_devices->seed_list, seed_list) { 2065 list_for_each_entry(device, &seed->devices, dev_list) { 2066 ret = btrfs_sysfs_add_device(device); 2067 if (ret) 2068 goto fail; 2069 } 2070 } 2071 2072 return 0; 2073 2074 fail: 2075 btrfs_sysfs_remove_fs_devices(fs_devices); 2076 return ret; 2077 } 2078 2079 void btrfs_kobject_uevent(struct block_device *bdev, enum kobject_action action) 2080 { 2081 int ret; 2082 2083 ret = kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, action); 2084 if (ret) 2085 pr_warn("BTRFS: Sending event '%d' to kobject: '%s' (%p): failed\n", 2086 action, kobject_name(&disk_to_dev(bdev->bd_disk)->kobj), 2087 &disk_to_dev(bdev->bd_disk)->kobj); 2088 } 2089 2090 void btrfs_sysfs_update_sprout_fsid(struct btrfs_fs_devices *fs_devices) 2091 2092 { 2093 char fsid_buf[BTRFS_UUID_UNPARSED_SIZE]; 2094 2095 /* 2096 * Sprouting changes fsid of the mounted filesystem, rename the fsid 2097 * directory 2098 */ 2099 snprintf(fsid_buf, BTRFS_UUID_UNPARSED_SIZE, "%pU", fs_devices->fsid); 2100 if (kobject_rename(&fs_devices->fsid_kobj, fsid_buf)) 2101 btrfs_warn(fs_devices->fs_info, 2102 "sysfs: failed to create fsid for sprout"); 2103 } 2104 2105 void btrfs_sysfs_update_devid(struct btrfs_device *device) 2106 { 2107 char tmp[24]; 2108 2109 snprintf(tmp, sizeof(tmp), "%llu", device->devid); 2110 2111 if (kobject_rename(&device->devid_kobj, tmp)) 2112 btrfs_warn(device->fs_devices->fs_info, 2113 "sysfs: failed to update devid for %llu", 2114 device->devid); 2115 } 2116 2117 /* /sys/fs/btrfs/ entry */ 2118 static struct kset *btrfs_kset; 2119 2120 /* 2121 * Creates: 2122 * /sys/fs/btrfs/UUID 2123 * 2124 * Can be called by the device discovery thread. 2125 */ 2126 int btrfs_sysfs_add_fsid(struct btrfs_fs_devices *fs_devs) 2127 { 2128 int error; 2129 2130 init_completion(&fs_devs->kobj_unregister); 2131 fs_devs->fsid_kobj.kset = btrfs_kset; 2132 error = kobject_init_and_add(&fs_devs->fsid_kobj, &btrfs_ktype, NULL, 2133 "%pU", fs_devs->fsid); 2134 if (error) { 2135 kobject_put(&fs_devs->fsid_kobj); 2136 return error; 2137 } 2138 2139 fs_devs->devices_kobj = kobject_create_and_add("devices", 2140 &fs_devs->fsid_kobj); 2141 if (!fs_devs->devices_kobj) { 2142 btrfs_err(fs_devs->fs_info, 2143 "failed to init sysfs device interface"); 2144 btrfs_sysfs_remove_fsid(fs_devs); 2145 return -ENOMEM; 2146 } 2147 2148 fs_devs->devinfo_kobj = kobject_create_and_add("devinfo", 2149 &fs_devs->fsid_kobj); 2150 if (!fs_devs->devinfo_kobj) { 2151 btrfs_err(fs_devs->fs_info, 2152 "failed to init sysfs devinfo kobject"); 2153 btrfs_sysfs_remove_fsid(fs_devs); 2154 return -ENOMEM; 2155 } 2156 2157 return 0; 2158 } 2159 2160 int btrfs_sysfs_add_mounted(struct btrfs_fs_info *fs_info) 2161 { 2162 int error; 2163 struct btrfs_fs_devices *fs_devs = fs_info->fs_devices; 2164 struct kobject *fsid_kobj = &fs_devs->fsid_kobj; 2165 2166 error = btrfs_sysfs_add_fs_devices(fs_devs); 2167 if (error) 2168 return error; 2169 2170 error = sysfs_create_files(fsid_kobj, btrfs_attrs); 2171 if (error) { 2172 btrfs_sysfs_remove_fs_devices(fs_devs); 2173 return error; 2174 } 2175 2176 error = sysfs_create_group(fsid_kobj, 2177 &btrfs_feature_attr_group); 2178 if (error) 2179 goto failure; 2180 2181 #ifdef CONFIG_BTRFS_DEBUG 2182 fs_info->debug_kobj = kobject_create_and_add("debug", fsid_kobj); 2183 if (!fs_info->debug_kobj) { 2184 error = -ENOMEM; 2185 goto failure; 2186 } 2187 2188 error = sysfs_create_files(fs_info->debug_kobj, btrfs_debug_mount_attrs); 2189 if (error) 2190 goto failure; 2191 #endif 2192 2193 /* Discard directory */ 2194 fs_info->discard_kobj = kobject_create_and_add("discard", fsid_kobj); 2195 if (!fs_info->discard_kobj) { 2196 error = -ENOMEM; 2197 goto failure; 2198 } 2199 2200 error = sysfs_create_files(fs_info->discard_kobj, discard_attrs); 2201 if (error) 2202 goto failure; 2203 2204 error = addrm_unknown_feature_attrs(fs_info, true); 2205 if (error) 2206 goto failure; 2207 2208 error = sysfs_create_link(fsid_kobj, &fs_info->sb->s_bdi->dev->kobj, "bdi"); 2209 if (error) 2210 goto failure; 2211 2212 fs_info->space_info_kobj = kobject_create_and_add("allocation", 2213 fsid_kobj); 2214 if (!fs_info->space_info_kobj) { 2215 error = -ENOMEM; 2216 goto failure; 2217 } 2218 2219 error = sysfs_create_files(fs_info->space_info_kobj, allocation_attrs); 2220 if (error) 2221 goto failure; 2222 2223 return 0; 2224 failure: 2225 btrfs_sysfs_remove_mounted(fs_info); 2226 return error; 2227 } 2228 2229 static ssize_t qgroup_enabled_show(struct kobject *qgroups_kobj, 2230 struct kobj_attribute *a, 2231 char *buf) 2232 { 2233 struct btrfs_fs_info *fs_info = to_fs_info(qgroups_kobj->parent); 2234 bool enabled; 2235 2236 spin_lock(&fs_info->qgroup_lock); 2237 enabled = fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_ON; 2238 spin_unlock(&fs_info->qgroup_lock); 2239 2240 return sysfs_emit(buf, "%d\n", enabled); 2241 } 2242 BTRFS_ATTR(qgroups, enabled, qgroup_enabled_show); 2243 2244 static ssize_t qgroup_mode_show(struct kobject *qgroups_kobj, 2245 struct kobj_attribute *a, 2246 char *buf) 2247 { 2248 struct btrfs_fs_info *fs_info = to_fs_info(qgroups_kobj->parent); 2249 ssize_t ret = 0; 2250 2251 spin_lock(&fs_info->qgroup_lock); 2252 ASSERT(btrfs_qgroup_enabled(fs_info)); 2253 switch (btrfs_qgroup_mode(fs_info)) { 2254 case BTRFS_QGROUP_MODE_FULL: 2255 ret = sysfs_emit(buf, "qgroup\n"); 2256 break; 2257 case BTRFS_QGROUP_MODE_SIMPLE: 2258 ret = sysfs_emit(buf, "squota\n"); 2259 break; 2260 default: 2261 btrfs_warn(fs_info, "unexpected qgroup mode %d\n", 2262 btrfs_qgroup_mode(fs_info)); 2263 break; 2264 } 2265 spin_unlock(&fs_info->qgroup_lock); 2266 2267 return ret; 2268 } 2269 BTRFS_ATTR(qgroups, mode, qgroup_mode_show); 2270 2271 static ssize_t qgroup_inconsistent_show(struct kobject *qgroups_kobj, 2272 struct kobj_attribute *a, 2273 char *buf) 2274 { 2275 struct btrfs_fs_info *fs_info = to_fs_info(qgroups_kobj->parent); 2276 bool inconsistent; 2277 2278 spin_lock(&fs_info->qgroup_lock); 2279 inconsistent = (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT); 2280 spin_unlock(&fs_info->qgroup_lock); 2281 2282 return sysfs_emit(buf, "%d\n", inconsistent); 2283 } 2284 BTRFS_ATTR(qgroups, inconsistent, qgroup_inconsistent_show); 2285 2286 static ssize_t qgroup_drop_subtree_thres_show(struct kobject *qgroups_kobj, 2287 struct kobj_attribute *a, 2288 char *buf) 2289 { 2290 struct btrfs_fs_info *fs_info = to_fs_info(qgroups_kobj->parent); 2291 u8 result; 2292 2293 spin_lock(&fs_info->qgroup_lock); 2294 result = fs_info->qgroup_drop_subtree_thres; 2295 spin_unlock(&fs_info->qgroup_lock); 2296 2297 return sysfs_emit(buf, "%d\n", result); 2298 } 2299 2300 static ssize_t qgroup_drop_subtree_thres_store(struct kobject *qgroups_kobj, 2301 struct kobj_attribute *a, 2302 const char *buf, size_t len) 2303 { 2304 struct btrfs_fs_info *fs_info = to_fs_info(qgroups_kobj->parent); 2305 u8 new_thres; 2306 int ret; 2307 2308 ret = kstrtou8(buf, 10, &new_thres); 2309 if (ret) 2310 return -EINVAL; 2311 2312 if (new_thres > BTRFS_MAX_LEVEL) 2313 return -EINVAL; 2314 2315 spin_lock(&fs_info->qgroup_lock); 2316 fs_info->qgroup_drop_subtree_thres = new_thres; 2317 spin_unlock(&fs_info->qgroup_lock); 2318 2319 return len; 2320 } 2321 BTRFS_ATTR_RW(qgroups, drop_subtree_threshold, qgroup_drop_subtree_thres_show, 2322 qgroup_drop_subtree_thres_store); 2323 2324 /* 2325 * Qgroups global info 2326 * 2327 * Path: /sys/fs/btrfs/<uuid>/qgroups/ 2328 */ 2329 static struct attribute *qgroups_attrs[] = { 2330 BTRFS_ATTR_PTR(qgroups, enabled), 2331 BTRFS_ATTR_PTR(qgroups, inconsistent), 2332 BTRFS_ATTR_PTR(qgroups, drop_subtree_threshold), 2333 BTRFS_ATTR_PTR(qgroups, mode), 2334 NULL 2335 }; 2336 ATTRIBUTE_GROUPS(qgroups); 2337 2338 static void qgroups_release(struct kobject *kobj) 2339 { 2340 kfree(kobj); 2341 } 2342 2343 static const struct kobj_type qgroups_ktype = { 2344 .sysfs_ops = &kobj_sysfs_ops, 2345 .default_groups = qgroups_groups, 2346 .release = qgroups_release, 2347 }; 2348 2349 static inline struct btrfs_fs_info *qgroup_kobj_to_fs_info(struct kobject *kobj) 2350 { 2351 return to_fs_info(kobj->parent->parent); 2352 } 2353 2354 #define QGROUP_ATTR(_member, _show_name) \ 2355 static ssize_t btrfs_qgroup_show_##_member(struct kobject *qgroup_kobj, \ 2356 struct kobj_attribute *a, \ 2357 char *buf) \ 2358 { \ 2359 struct btrfs_fs_info *fs_info = qgroup_kobj_to_fs_info(qgroup_kobj); \ 2360 struct btrfs_qgroup *qgroup = container_of(qgroup_kobj, \ 2361 struct btrfs_qgroup, kobj); \ 2362 return btrfs_show_u64(&qgroup->_member, &fs_info->qgroup_lock, buf); \ 2363 } \ 2364 BTRFS_ATTR(qgroup, _show_name, btrfs_qgroup_show_##_member) 2365 2366 #define QGROUP_RSV_ATTR(_name, _type) \ 2367 static ssize_t btrfs_qgroup_rsv_show_##_name(struct kobject *qgroup_kobj, \ 2368 struct kobj_attribute *a, \ 2369 char *buf) \ 2370 { \ 2371 struct btrfs_fs_info *fs_info = qgroup_kobj_to_fs_info(qgroup_kobj); \ 2372 struct btrfs_qgroup *qgroup = container_of(qgroup_kobj, \ 2373 struct btrfs_qgroup, kobj); \ 2374 return btrfs_show_u64(&qgroup->rsv.values[_type], \ 2375 &fs_info->qgroup_lock, buf); \ 2376 } \ 2377 BTRFS_ATTR(qgroup, rsv_##_name, btrfs_qgroup_rsv_show_##_name) 2378 2379 QGROUP_ATTR(rfer, referenced); 2380 QGROUP_ATTR(excl, exclusive); 2381 QGROUP_ATTR(max_rfer, max_referenced); 2382 QGROUP_ATTR(max_excl, max_exclusive); 2383 QGROUP_ATTR(lim_flags, limit_flags); 2384 QGROUP_RSV_ATTR(data, BTRFS_QGROUP_RSV_DATA); 2385 QGROUP_RSV_ATTR(meta_pertrans, BTRFS_QGROUP_RSV_META_PERTRANS); 2386 QGROUP_RSV_ATTR(meta_prealloc, BTRFS_QGROUP_RSV_META_PREALLOC); 2387 2388 /* 2389 * Qgroup information. 2390 * 2391 * Path: /sys/fs/btrfs/<uuid>/qgroups/<level>_<qgroupid>/ 2392 */ 2393 static struct attribute *qgroup_attrs[] = { 2394 BTRFS_ATTR_PTR(qgroup, referenced), 2395 BTRFS_ATTR_PTR(qgroup, exclusive), 2396 BTRFS_ATTR_PTR(qgroup, max_referenced), 2397 BTRFS_ATTR_PTR(qgroup, max_exclusive), 2398 BTRFS_ATTR_PTR(qgroup, limit_flags), 2399 BTRFS_ATTR_PTR(qgroup, rsv_data), 2400 BTRFS_ATTR_PTR(qgroup, rsv_meta_pertrans), 2401 BTRFS_ATTR_PTR(qgroup, rsv_meta_prealloc), 2402 NULL 2403 }; 2404 ATTRIBUTE_GROUPS(qgroup); 2405 2406 static void qgroup_release(struct kobject *kobj) 2407 { 2408 struct btrfs_qgroup *qgroup = container_of(kobj, struct btrfs_qgroup, kobj); 2409 2410 memset(&qgroup->kobj, 0, sizeof(*kobj)); 2411 } 2412 2413 static const struct kobj_type qgroup_ktype = { 2414 .sysfs_ops = &kobj_sysfs_ops, 2415 .release = qgroup_release, 2416 .default_groups = qgroup_groups, 2417 }; 2418 2419 int btrfs_sysfs_add_one_qgroup(struct btrfs_fs_info *fs_info, 2420 struct btrfs_qgroup *qgroup) 2421 { 2422 struct kobject *qgroups_kobj = fs_info->qgroups_kobj; 2423 int ret; 2424 2425 if (btrfs_is_testing(fs_info)) 2426 return 0; 2427 if (qgroup->kobj.state_initialized) 2428 return 0; 2429 if (!qgroups_kobj) 2430 return -EINVAL; 2431 2432 ret = kobject_init_and_add(&qgroup->kobj, &qgroup_ktype, qgroups_kobj, 2433 "%hu_%llu", btrfs_qgroup_level(qgroup->qgroupid), 2434 btrfs_qgroup_subvolid(qgroup->qgroupid)); 2435 if (ret < 0) 2436 kobject_put(&qgroup->kobj); 2437 2438 return ret; 2439 } 2440 2441 void btrfs_sysfs_del_qgroups(struct btrfs_fs_info *fs_info) 2442 { 2443 struct btrfs_qgroup *qgroup; 2444 struct btrfs_qgroup *next; 2445 2446 if (btrfs_is_testing(fs_info)) 2447 return; 2448 2449 rbtree_postorder_for_each_entry_safe(qgroup, next, 2450 &fs_info->qgroup_tree, node) 2451 btrfs_sysfs_del_one_qgroup(fs_info, qgroup); 2452 if (fs_info->qgroups_kobj) { 2453 kobject_del(fs_info->qgroups_kobj); 2454 kobject_put(fs_info->qgroups_kobj); 2455 fs_info->qgroups_kobj = NULL; 2456 } 2457 } 2458 2459 /* Called when qgroups get initialized, thus there is no need for locking */ 2460 int btrfs_sysfs_add_qgroups(struct btrfs_fs_info *fs_info) 2461 { 2462 struct kobject *fsid_kobj = &fs_info->fs_devices->fsid_kobj; 2463 struct btrfs_qgroup *qgroup; 2464 struct btrfs_qgroup *next; 2465 int ret = 0; 2466 2467 if (btrfs_is_testing(fs_info)) 2468 return 0; 2469 2470 ASSERT(fsid_kobj); 2471 if (fs_info->qgroups_kobj) 2472 return 0; 2473 2474 fs_info->qgroups_kobj = kzalloc(sizeof(struct kobject), GFP_KERNEL); 2475 if (!fs_info->qgroups_kobj) 2476 return -ENOMEM; 2477 2478 ret = kobject_init_and_add(fs_info->qgroups_kobj, &qgroups_ktype, 2479 fsid_kobj, "qgroups"); 2480 if (ret < 0) 2481 goto out; 2482 2483 rbtree_postorder_for_each_entry_safe(qgroup, next, 2484 &fs_info->qgroup_tree, node) { 2485 ret = btrfs_sysfs_add_one_qgroup(fs_info, qgroup); 2486 if (ret < 0) 2487 goto out; 2488 } 2489 2490 out: 2491 if (ret < 0) 2492 btrfs_sysfs_del_qgroups(fs_info); 2493 return ret; 2494 } 2495 2496 void btrfs_sysfs_del_one_qgroup(struct btrfs_fs_info *fs_info, 2497 struct btrfs_qgroup *qgroup) 2498 { 2499 if (btrfs_is_testing(fs_info)) 2500 return; 2501 2502 if (qgroup->kobj.state_initialized) { 2503 kobject_del(&qgroup->kobj); 2504 kobject_put(&qgroup->kobj); 2505 } 2506 } 2507 2508 /* 2509 * Change per-fs features in /sys/fs/btrfs/UUID/features to match current 2510 * values in superblock. Call after any changes to incompat/compat_ro flags 2511 */ 2512 void btrfs_sysfs_feature_update(struct btrfs_fs_info *fs_info) 2513 { 2514 struct kobject *fsid_kobj; 2515 int ret; 2516 2517 if (!fs_info) 2518 return; 2519 2520 fsid_kobj = &fs_info->fs_devices->fsid_kobj; 2521 if (!fsid_kobj->state_initialized) 2522 return; 2523 2524 ret = sysfs_update_group(fsid_kobj, &btrfs_feature_attr_group); 2525 if (ret < 0) 2526 btrfs_warn(fs_info, 2527 "failed to update /sys/fs/btrfs/%pU/features: %d", 2528 fs_info->fs_devices->fsid, ret); 2529 } 2530 2531 int __init btrfs_init_sysfs(void) 2532 { 2533 int ret; 2534 2535 btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj); 2536 if (!btrfs_kset) 2537 return -ENOMEM; 2538 2539 init_feature_attrs(); 2540 ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); 2541 if (ret) 2542 goto out2; 2543 ret = sysfs_merge_group(&btrfs_kset->kobj, 2544 &btrfs_static_feature_attr_group); 2545 if (ret) 2546 goto out_remove_group; 2547 2548 #ifdef CONFIG_BTRFS_DEBUG 2549 ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_debug_feature_attr_group); 2550 if (ret) { 2551 sysfs_unmerge_group(&btrfs_kset->kobj, 2552 &btrfs_static_feature_attr_group); 2553 goto out_remove_group; 2554 } 2555 #endif 2556 2557 return 0; 2558 2559 out_remove_group: 2560 sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); 2561 out2: 2562 kset_unregister(btrfs_kset); 2563 2564 return ret; 2565 } 2566 2567 void __cold btrfs_exit_sysfs(void) 2568 { 2569 sysfs_unmerge_group(&btrfs_kset->kobj, 2570 &btrfs_static_feature_attr_group); 2571 sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); 2572 #ifdef CONFIG_BTRFS_DEBUG 2573 sysfs_remove_group(&btrfs_kset->kobj, &btrfs_debug_feature_attr_group); 2574 #endif 2575 kset_unregister(btrfs_kset); 2576 } 2577