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_EXPERIMENTAL 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_EXPERIMENTAL 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->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->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->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 *btrfs_read_policy_name[] = { 1309 "pid", 1310 #ifdef CONFIG_BTRFS_EXPERIMENTAL 1311 "round-robin", 1312 "devid", 1313 #endif 1314 }; 1315 1316 #ifdef CONFIG_BTRFS_EXPERIMENTAL 1317 1318 /* Global module configuration parameters. */ 1319 static char *read_policy; 1320 char *btrfs_get_mod_read_policy(void) 1321 { 1322 return read_policy; 1323 } 1324 1325 /* Set perms to 0, disable /sys/module/btrfs/parameter/read_policy interface. */ 1326 module_param(read_policy, charp, 0); 1327 MODULE_PARM_DESC(read_policy, 1328 "Global read policy: pid (default), round-robin[:<min_contig_read>], devid[:<devid>]"); 1329 #endif 1330 1331 int btrfs_read_policy_to_enum(const char *str, s64 *value_ret) 1332 { 1333 char param[32] = { 0 }; 1334 char __maybe_unused *value_str; 1335 1336 if (!str || strlen(str) == 0) 1337 return 0; 1338 1339 strncpy(param, str, sizeof(param) - 1); 1340 1341 #ifdef CONFIG_BTRFS_EXPERIMENTAL 1342 /* Separate value from input in policy:value format. */ 1343 value_str = strchr(param, ':'); 1344 if (value_str) { 1345 int ret; 1346 1347 *value_str = 0; 1348 value_str++; 1349 if (!value_ret) 1350 return -EINVAL; 1351 ret = kstrtos64(value_str, 10, value_ret); 1352 if (ret) 1353 return -EINVAL; 1354 if (*value_ret < 0) 1355 return -ERANGE; 1356 } 1357 #endif 1358 1359 return sysfs_match_string(btrfs_read_policy_name, param); 1360 } 1361 1362 #ifdef CONFIG_BTRFS_EXPERIMENTAL 1363 int __init btrfs_read_policy_init(void) 1364 { 1365 s64 value; 1366 1367 if (btrfs_read_policy_to_enum(read_policy, &value) == -EINVAL) { 1368 btrfs_err(NULL, "invalid read policy or value %s", read_policy); 1369 return -EINVAL; 1370 } 1371 1372 return 0; 1373 } 1374 #endif 1375 1376 static ssize_t btrfs_read_policy_show(struct kobject *kobj, 1377 struct kobj_attribute *a, char *buf) 1378 { 1379 struct btrfs_fs_devices *fs_devices = to_fs_devs(kobj); 1380 const enum btrfs_read_policy policy = READ_ONCE(fs_devices->read_policy); 1381 ssize_t ret = 0; 1382 int i; 1383 1384 for (i = 0; i < BTRFS_NR_READ_POLICY; i++) { 1385 if (ret != 0) 1386 ret += sysfs_emit_at(buf, ret, " "); 1387 1388 if (i == policy) 1389 ret += sysfs_emit_at(buf, ret, "["); 1390 1391 ret += sysfs_emit_at(buf, ret, "%s", btrfs_read_policy_name[i]); 1392 1393 #ifdef CONFIG_BTRFS_EXPERIMENTAL 1394 if (i == BTRFS_READ_POLICY_RR) 1395 ret += sysfs_emit_at(buf, ret, ":%u", 1396 READ_ONCE(fs_devices->rr_min_contig_read)); 1397 1398 if (i == BTRFS_READ_POLICY_DEVID) 1399 ret += sysfs_emit_at(buf, ret, ":%llu", 1400 READ_ONCE(fs_devices->read_devid)); 1401 #endif 1402 if (i == policy) 1403 ret += sysfs_emit_at(buf, ret, "]"); 1404 } 1405 1406 ret += sysfs_emit_at(buf, ret, "\n"); 1407 1408 return ret; 1409 } 1410 1411 static ssize_t btrfs_read_policy_store(struct kobject *kobj, 1412 struct kobj_attribute *a, 1413 const char *buf, size_t len) 1414 { 1415 struct btrfs_fs_devices *fs_devices = to_fs_devs(kobj); 1416 int index; 1417 s64 value = -1; 1418 1419 index = btrfs_read_policy_to_enum(buf, &value); 1420 if (index < 0) 1421 return -EINVAL; 1422 1423 #ifdef CONFIG_BTRFS_EXPERIMENTAL 1424 /* If moving from RR then disable collecting fs stats. */ 1425 if (fs_devices->read_policy == BTRFS_READ_POLICY_RR && index != BTRFS_READ_POLICY_RR) 1426 fs_devices->collect_fs_stats = false; 1427 1428 if (index == BTRFS_READ_POLICY_RR) { 1429 if (value != -1) { 1430 const u32 sectorsize = fs_devices->fs_info->sectorsize; 1431 1432 if (!IS_ALIGNED(value, sectorsize)) { 1433 u64 temp_value = round_up(value, sectorsize); 1434 1435 btrfs_debug(fs_devices->fs_info, 1436 "read_policy: min contig read %lld should be multiple of sectorsize %u, rounded to %llu", 1437 value, sectorsize, temp_value); 1438 value = temp_value; 1439 } 1440 } else { 1441 value = BTRFS_DEFAULT_RR_MIN_CONTIG_READ; 1442 } 1443 1444 if (index != READ_ONCE(fs_devices->read_policy) || 1445 value != READ_ONCE(fs_devices->rr_min_contig_read)) { 1446 WRITE_ONCE(fs_devices->read_policy, index); 1447 WRITE_ONCE(fs_devices->rr_min_contig_read, value); 1448 1449 btrfs_info(fs_devices->fs_info, "read policy set to '%s:%lld'", 1450 btrfs_read_policy_name[index], value); 1451 } 1452 1453 fs_devices->collect_fs_stats = true; 1454 1455 return len; 1456 } 1457 1458 if (index == BTRFS_READ_POLICY_DEVID) { 1459 if (value != -1) { 1460 BTRFS_DEV_LOOKUP_ARGS(args); 1461 1462 /* Validate input devid. */ 1463 args.devid = value; 1464 if (btrfs_find_device(fs_devices, &args) == NULL) 1465 return -EINVAL; 1466 } else { 1467 /* Set default devid to the devid of the latest device. */ 1468 value = fs_devices->latest_dev->devid; 1469 } 1470 1471 if (index != READ_ONCE(fs_devices->read_policy) || 1472 value != READ_ONCE(fs_devices->read_devid)) { 1473 WRITE_ONCE(fs_devices->read_policy, index); 1474 WRITE_ONCE(fs_devices->read_devid, value); 1475 1476 btrfs_info(fs_devices->fs_info, "read policy set to '%s:%llu'", 1477 btrfs_read_policy_name[index], value); 1478 } 1479 1480 return len; 1481 } 1482 #endif 1483 if (index != READ_ONCE(fs_devices->read_policy)) { 1484 WRITE_ONCE(fs_devices->read_policy, index); 1485 btrfs_info(fs_devices->fs_info, "read policy set to '%s'", 1486 btrfs_read_policy_name[index]); 1487 } 1488 1489 return len; 1490 } 1491 BTRFS_ATTR_RW(, read_policy, btrfs_read_policy_show, btrfs_read_policy_store); 1492 1493 static ssize_t btrfs_bg_reclaim_threshold_show(struct kobject *kobj, 1494 struct kobj_attribute *a, 1495 char *buf) 1496 { 1497 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 1498 1499 return sysfs_emit(buf, "%d\n", READ_ONCE(fs_info->bg_reclaim_threshold)); 1500 } 1501 1502 static ssize_t btrfs_bg_reclaim_threshold_store(struct kobject *kobj, 1503 struct kobj_attribute *a, 1504 const char *buf, size_t len) 1505 { 1506 struct btrfs_fs_info *fs_info = to_fs_info(kobj); 1507 int thresh; 1508 int ret; 1509 1510 ret = kstrtoint(buf, 10, &thresh); 1511 if (ret) 1512 return ret; 1513 1514 #ifdef CONFIG_BTRFS_DEBUG 1515 if (thresh != 0 && (thresh > 100)) 1516 return -EINVAL; 1517 #else 1518 if (thresh != 0 && (thresh <= 50 || thresh > 100)) 1519 return -EINVAL; 1520 #endif 1521 1522 WRITE_ONCE(fs_info->bg_reclaim_threshold, thresh); 1523 1524 return len; 1525 } 1526 BTRFS_ATTR_RW(, bg_reclaim_threshold, btrfs_bg_reclaim_threshold_show, 1527 btrfs_bg_reclaim_threshold_store); 1528 1529 #ifdef CONFIG_BTRFS_EXPERIMENTAL 1530 static ssize_t btrfs_offload_csum_show(struct kobject *kobj, 1531 struct kobj_attribute *a, char *buf) 1532 { 1533 struct btrfs_fs_devices *fs_devices = to_fs_devs(kobj); 1534 1535 switch (READ_ONCE(fs_devices->offload_csum_mode)) { 1536 case BTRFS_OFFLOAD_CSUM_AUTO: 1537 return sysfs_emit(buf, "auto\n"); 1538 case BTRFS_OFFLOAD_CSUM_FORCE_ON: 1539 return sysfs_emit(buf, "1\n"); 1540 case BTRFS_OFFLOAD_CSUM_FORCE_OFF: 1541 return sysfs_emit(buf, "0\n"); 1542 default: 1543 WARN_ON(1); 1544 return -EINVAL; 1545 } 1546 } 1547 1548 static ssize_t btrfs_offload_csum_store(struct kobject *kobj, 1549 struct kobj_attribute *a, const char *buf, 1550 size_t len) 1551 { 1552 struct btrfs_fs_devices *fs_devices = to_fs_devs(kobj); 1553 int ret; 1554 bool val; 1555 1556 ret = kstrtobool(buf, &val); 1557 if (ret == 0) 1558 WRITE_ONCE(fs_devices->offload_csum_mode, 1559 val ? BTRFS_OFFLOAD_CSUM_FORCE_ON : BTRFS_OFFLOAD_CSUM_FORCE_OFF); 1560 else if (ret == -EINVAL && sysfs_streq(buf, "auto")) 1561 WRITE_ONCE(fs_devices->offload_csum_mode, BTRFS_OFFLOAD_CSUM_AUTO); 1562 else 1563 return -EINVAL; 1564 1565 return len; 1566 } 1567 BTRFS_ATTR_RW(, offload_csum, btrfs_offload_csum_show, btrfs_offload_csum_store); 1568 #endif 1569 1570 /* 1571 * Per-filesystem information and stats. 1572 * 1573 * Path: /sys/fs/btrfs/<uuid>/ 1574 */ 1575 static const struct attribute *btrfs_attrs[] = { 1576 BTRFS_ATTR_PTR(, label), 1577 BTRFS_ATTR_PTR(, nodesize), 1578 BTRFS_ATTR_PTR(, sectorsize), 1579 BTRFS_ATTR_PTR(, clone_alignment), 1580 BTRFS_ATTR_PTR(, quota_override), 1581 BTRFS_ATTR_PTR(, metadata_uuid), 1582 BTRFS_ATTR_PTR(, checksum), 1583 BTRFS_ATTR_PTR(, exclusive_operation), 1584 BTRFS_ATTR_PTR(, generation), 1585 BTRFS_ATTR_PTR(, read_policy), 1586 BTRFS_ATTR_PTR(, bg_reclaim_threshold), 1587 BTRFS_ATTR_PTR(, commit_stats), 1588 BTRFS_ATTR_PTR(, temp_fsid), 1589 #ifdef CONFIG_BTRFS_EXPERIMENTAL 1590 BTRFS_ATTR_PTR(, offload_csum), 1591 #endif 1592 NULL, 1593 }; 1594 1595 static void btrfs_release_fsid_kobj(struct kobject *kobj) 1596 { 1597 struct btrfs_fs_devices *fs_devs = to_fs_devs(kobj); 1598 1599 memset(&fs_devs->fsid_kobj, 0, sizeof(struct kobject)); 1600 complete(&fs_devs->kobj_unregister); 1601 } 1602 1603 static const struct kobj_type btrfs_ktype = { 1604 .sysfs_ops = &kobj_sysfs_ops, 1605 .release = btrfs_release_fsid_kobj, 1606 }; 1607 1608 static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj) 1609 { 1610 if (kobj->ktype != &btrfs_ktype) 1611 return NULL; 1612 return container_of(kobj, struct btrfs_fs_devices, fsid_kobj); 1613 } 1614 1615 static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj) 1616 { 1617 if (kobj->ktype != &btrfs_ktype) 1618 return NULL; 1619 return to_fs_devs(kobj)->fs_info; 1620 } 1621 1622 static struct kobject *get_btrfs_kobj(struct kobject *kobj) 1623 { 1624 while (kobj) { 1625 if (kobj->ktype == &btrfs_ktype) 1626 return kobj; 1627 kobj = kobj->parent; 1628 } 1629 return NULL; 1630 } 1631 1632 #define NUM_FEATURE_BITS 64 1633 #define BTRFS_FEATURE_NAME_MAX 13 1634 static char btrfs_unknown_feature_names[FEAT_MAX][NUM_FEATURE_BITS][BTRFS_FEATURE_NAME_MAX]; 1635 static struct btrfs_feature_attr btrfs_feature_attrs[FEAT_MAX][NUM_FEATURE_BITS]; 1636 1637 static_assert(ARRAY_SIZE(btrfs_unknown_feature_names) == 1638 ARRAY_SIZE(btrfs_feature_attrs)); 1639 static_assert(ARRAY_SIZE(btrfs_unknown_feature_names[0]) == 1640 ARRAY_SIZE(btrfs_feature_attrs[0])); 1641 1642 static const u64 supported_feature_masks[FEAT_MAX] = { 1643 [FEAT_COMPAT] = BTRFS_FEATURE_COMPAT_SUPP, 1644 [FEAT_COMPAT_RO] = BTRFS_FEATURE_COMPAT_RO_SUPP, 1645 [FEAT_INCOMPAT] = BTRFS_FEATURE_INCOMPAT_SUPP, 1646 }; 1647 1648 static int addrm_unknown_feature_attrs(struct btrfs_fs_info *fs_info, bool add) 1649 { 1650 int set; 1651 1652 for (set = 0; set < FEAT_MAX; set++) { 1653 int i; 1654 struct attribute *attrs[2]; 1655 struct attribute_group agroup = { 1656 .name = "features", 1657 .attrs = attrs, 1658 }; 1659 u64 features = get_features(fs_info, set); 1660 features &= ~supported_feature_masks[set]; 1661 1662 if (!features) 1663 continue; 1664 1665 attrs[1] = NULL; 1666 for (i = 0; i < NUM_FEATURE_BITS; i++) { 1667 struct btrfs_feature_attr *fa; 1668 1669 if (!(features & (1ULL << i))) 1670 continue; 1671 1672 fa = &btrfs_feature_attrs[set][i]; 1673 attrs[0] = &fa->kobj_attr.attr; 1674 if (add) { 1675 int ret; 1676 ret = sysfs_merge_group(&fs_info->fs_devices->fsid_kobj, 1677 &agroup); 1678 if (ret) 1679 return ret; 1680 } else 1681 sysfs_unmerge_group(&fs_info->fs_devices->fsid_kobj, 1682 &agroup); 1683 } 1684 1685 } 1686 return 0; 1687 } 1688 1689 static void __btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs) 1690 { 1691 if (fs_devs->devinfo_kobj) { 1692 kobject_del(fs_devs->devinfo_kobj); 1693 kobject_put(fs_devs->devinfo_kobj); 1694 fs_devs->devinfo_kobj = NULL; 1695 } 1696 1697 if (fs_devs->devices_kobj) { 1698 kobject_del(fs_devs->devices_kobj); 1699 kobject_put(fs_devs->devices_kobj); 1700 fs_devs->devices_kobj = NULL; 1701 } 1702 1703 if (fs_devs->fsid_kobj.state_initialized) { 1704 kobject_del(&fs_devs->fsid_kobj); 1705 kobject_put(&fs_devs->fsid_kobj); 1706 wait_for_completion(&fs_devs->kobj_unregister); 1707 } 1708 } 1709 1710 /* when fs_devs is NULL it will remove all fsid kobject */ 1711 void btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs) 1712 { 1713 struct list_head *fs_uuids = btrfs_get_fs_uuids(); 1714 1715 if (fs_devs) { 1716 __btrfs_sysfs_remove_fsid(fs_devs); 1717 return; 1718 } 1719 1720 list_for_each_entry(fs_devs, fs_uuids, fs_list) { 1721 __btrfs_sysfs_remove_fsid(fs_devs); 1722 } 1723 } 1724 1725 static void btrfs_sysfs_remove_fs_devices(struct btrfs_fs_devices *fs_devices) 1726 { 1727 struct btrfs_device *device; 1728 struct btrfs_fs_devices *seed; 1729 1730 list_for_each_entry(device, &fs_devices->devices, dev_list) 1731 btrfs_sysfs_remove_device(device); 1732 1733 list_for_each_entry(seed, &fs_devices->seed_list, seed_list) { 1734 list_for_each_entry(device, &seed->devices, dev_list) 1735 btrfs_sysfs_remove_device(device); 1736 } 1737 } 1738 1739 void btrfs_sysfs_remove_mounted(struct btrfs_fs_info *fs_info) 1740 { 1741 struct kobject *fsid_kobj = &fs_info->fs_devices->fsid_kobj; 1742 1743 sysfs_remove_link(fsid_kobj, "bdi"); 1744 1745 if (fs_info->space_info_kobj) { 1746 sysfs_remove_files(fs_info->space_info_kobj, allocation_attrs); 1747 kobject_del(fs_info->space_info_kobj); 1748 kobject_put(fs_info->space_info_kobj); 1749 } 1750 if (fs_info->discard_kobj) { 1751 sysfs_remove_files(fs_info->discard_kobj, discard_attrs); 1752 kobject_del(fs_info->discard_kobj); 1753 kobject_put(fs_info->discard_kobj); 1754 } 1755 #ifdef CONFIG_BTRFS_DEBUG 1756 if (fs_info->debug_kobj) { 1757 sysfs_remove_files(fs_info->debug_kobj, btrfs_debug_mount_attrs); 1758 kobject_del(fs_info->debug_kobj); 1759 kobject_put(fs_info->debug_kobj); 1760 } 1761 #endif 1762 addrm_unknown_feature_attrs(fs_info, false); 1763 sysfs_remove_group(fsid_kobj, &btrfs_feature_attr_group); 1764 sysfs_remove_files(fsid_kobj, btrfs_attrs); 1765 btrfs_sysfs_remove_fs_devices(fs_info->fs_devices); 1766 } 1767 1768 static const char * const btrfs_feature_set_names[FEAT_MAX] = { 1769 [FEAT_COMPAT] = "compat", 1770 [FEAT_COMPAT_RO] = "compat_ro", 1771 [FEAT_INCOMPAT] = "incompat", 1772 }; 1773 1774 const char *btrfs_feature_set_name(enum btrfs_feature_set set) 1775 { 1776 return btrfs_feature_set_names[set]; 1777 } 1778 1779 char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags) 1780 { 1781 size_t bufsize = 4096; /* safe max, 64 names * 64 bytes */ 1782 int len = 0; 1783 int i; 1784 char *str; 1785 1786 str = kmalloc(bufsize, GFP_KERNEL); 1787 if (!str) 1788 return str; 1789 1790 for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { 1791 const char *name; 1792 1793 if (!(flags & (1ULL << i))) 1794 continue; 1795 1796 name = btrfs_feature_attrs[set][i].kobj_attr.attr.name; 1797 len += scnprintf(str + len, bufsize - len, "%s%s", 1798 len ? "," : "", name); 1799 } 1800 1801 return str; 1802 } 1803 1804 static void init_feature_attrs(void) 1805 { 1806 struct btrfs_feature_attr *fa; 1807 int set, i; 1808 1809 memset(btrfs_feature_attrs, 0, sizeof(btrfs_feature_attrs)); 1810 memset(btrfs_unknown_feature_names, 0, 1811 sizeof(btrfs_unknown_feature_names)); 1812 1813 for (i = 0; btrfs_supported_feature_attrs[i]; i++) { 1814 struct btrfs_feature_attr *sfa; 1815 struct attribute *a = btrfs_supported_feature_attrs[i]; 1816 int bit; 1817 sfa = attr_to_btrfs_feature_attr(a); 1818 bit = ilog2(sfa->feature_bit); 1819 fa = &btrfs_feature_attrs[sfa->feature_set][bit]; 1820 1821 fa->kobj_attr.attr.name = sfa->kobj_attr.attr.name; 1822 } 1823 1824 for (set = 0; set < FEAT_MAX; set++) { 1825 for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { 1826 char *name = btrfs_unknown_feature_names[set][i]; 1827 fa = &btrfs_feature_attrs[set][i]; 1828 1829 if (fa->kobj_attr.attr.name) 1830 continue; 1831 1832 snprintf(name, BTRFS_FEATURE_NAME_MAX, "%s:%u", 1833 btrfs_feature_set_names[set], i); 1834 1835 fa->kobj_attr.attr.name = name; 1836 fa->kobj_attr.attr.mode = S_IRUGO; 1837 fa->feature_set = set; 1838 fa->feature_bit = 1ULL << i; 1839 } 1840 } 1841 } 1842 1843 /* 1844 * Create a sysfs entry for a given block group type at path 1845 * /sys/fs/btrfs/UUID/allocation/data/TYPE 1846 */ 1847 void btrfs_sysfs_add_block_group_type(struct btrfs_block_group *cache) 1848 { 1849 struct btrfs_fs_info *fs_info = cache->fs_info; 1850 struct btrfs_space_info *space_info = cache->space_info; 1851 struct raid_kobject *rkobj; 1852 const int index = btrfs_bg_flags_to_raid_index(cache->flags); 1853 unsigned int nofs_flag; 1854 int ret; 1855 1856 /* 1857 * Setup a NOFS context because kobject_add(), deep in its call chain, 1858 * does GFP_KERNEL allocations, and we are often called in a context 1859 * where if reclaim is triggered we can deadlock (we are either holding 1860 * a transaction handle or some lock required for a transaction 1861 * commit). 1862 */ 1863 nofs_flag = memalloc_nofs_save(); 1864 1865 rkobj = kzalloc(sizeof(*rkobj), GFP_NOFS); 1866 if (!rkobj) { 1867 memalloc_nofs_restore(nofs_flag); 1868 btrfs_warn(cache->fs_info, 1869 "couldn't alloc memory for raid level kobject"); 1870 return; 1871 } 1872 1873 rkobj->flags = cache->flags; 1874 kobject_init(&rkobj->kobj, &btrfs_raid_ktype); 1875 1876 /* 1877 * We call this either on mount, or if we've created a block group for a 1878 * new index type while running (i.e. when restriping). The running 1879 * case is tricky because we could race with other threads, so we need 1880 * to have this check to make sure we didn't already init the kobject. 1881 * 1882 * We don't have to protect on the free side because it only happens on 1883 * unmount. 1884 */ 1885 spin_lock(&space_info->lock); 1886 if (space_info->block_group_kobjs[index]) { 1887 spin_unlock(&space_info->lock); 1888 kobject_put(&rkobj->kobj); 1889 return; 1890 } else { 1891 space_info->block_group_kobjs[index] = &rkobj->kobj; 1892 } 1893 spin_unlock(&space_info->lock); 1894 1895 ret = kobject_add(&rkobj->kobj, &space_info->kobj, "%s", 1896 btrfs_bg_type_to_raid_name(rkobj->flags)); 1897 memalloc_nofs_restore(nofs_flag); 1898 if (ret) { 1899 spin_lock(&space_info->lock); 1900 space_info->block_group_kobjs[index] = NULL; 1901 spin_unlock(&space_info->lock); 1902 kobject_put(&rkobj->kobj); 1903 btrfs_warn(fs_info, 1904 "failed to add kobject for block cache, ignoring"); 1905 return; 1906 } 1907 } 1908 1909 /* 1910 * Remove sysfs directories for all block group types of a given space info and 1911 * the space info as well 1912 */ 1913 void btrfs_sysfs_remove_space_info(struct btrfs_space_info *space_info) 1914 { 1915 int i; 1916 1917 for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) { 1918 struct kobject *kobj; 1919 1920 kobj = space_info->block_group_kobjs[i]; 1921 space_info->block_group_kobjs[i] = NULL; 1922 if (kobj) { 1923 kobject_del(kobj); 1924 kobject_put(kobj); 1925 } 1926 } 1927 kobject_del(&space_info->kobj); 1928 kobject_put(&space_info->kobj); 1929 } 1930 1931 static const char *alloc_name(u64 flags) 1932 { 1933 switch (flags) { 1934 case BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_DATA: 1935 return "mixed"; 1936 case BTRFS_BLOCK_GROUP_METADATA: 1937 return "metadata"; 1938 case BTRFS_BLOCK_GROUP_DATA: 1939 return "data"; 1940 case BTRFS_BLOCK_GROUP_SYSTEM: 1941 return "system"; 1942 default: 1943 WARN_ON(1); 1944 return "invalid-combination"; 1945 } 1946 } 1947 1948 /* 1949 * Create a sysfs entry for a space info type at path 1950 * /sys/fs/btrfs/UUID/allocation/TYPE 1951 */ 1952 int btrfs_sysfs_add_space_info_type(struct btrfs_fs_info *fs_info, 1953 struct btrfs_space_info *space_info) 1954 { 1955 int ret; 1956 1957 ret = kobject_init_and_add(&space_info->kobj, &space_info_ktype, 1958 fs_info->space_info_kobj, "%s", 1959 alloc_name(space_info->flags)); 1960 if (ret) { 1961 kobject_put(&space_info->kobj); 1962 return ret; 1963 } 1964 1965 return 0; 1966 } 1967 1968 void btrfs_sysfs_remove_device(struct btrfs_device *device) 1969 { 1970 struct kobject *devices_kobj; 1971 1972 /* 1973 * Seed fs_devices devices_kobj aren't used, fetch kobject from the 1974 * fs_info::fs_devices. 1975 */ 1976 devices_kobj = device->fs_info->fs_devices->devices_kobj; 1977 ASSERT(devices_kobj); 1978 1979 if (device->bdev) 1980 sysfs_remove_link(devices_kobj, bdev_kobj(device->bdev)->name); 1981 1982 if (device->devid_kobj.state_initialized) { 1983 kobject_del(&device->devid_kobj); 1984 kobject_put(&device->devid_kobj); 1985 wait_for_completion(&device->kobj_unregister); 1986 } 1987 } 1988 1989 static ssize_t btrfs_devinfo_in_fs_metadata_show(struct kobject *kobj, 1990 struct kobj_attribute *a, 1991 char *buf) 1992 { 1993 int val; 1994 struct btrfs_device *device = container_of(kobj, struct btrfs_device, 1995 devid_kobj); 1996 1997 val = !!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &device->dev_state); 1998 1999 return sysfs_emit(buf, "%d\n", val); 2000 } 2001 BTRFS_ATTR(devid, in_fs_metadata, btrfs_devinfo_in_fs_metadata_show); 2002 2003 static ssize_t btrfs_devinfo_missing_show(struct kobject *kobj, 2004 struct kobj_attribute *a, char *buf) 2005 { 2006 int val; 2007 struct btrfs_device *device = container_of(kobj, struct btrfs_device, 2008 devid_kobj); 2009 2010 val = !!test_bit(BTRFS_DEV_STATE_MISSING, &device->dev_state); 2011 2012 return sysfs_emit(buf, "%d\n", val); 2013 } 2014 BTRFS_ATTR(devid, missing, btrfs_devinfo_missing_show); 2015 2016 static ssize_t btrfs_devinfo_replace_target_show(struct kobject *kobj, 2017 struct kobj_attribute *a, 2018 char *buf) 2019 { 2020 int val; 2021 struct btrfs_device *device = container_of(kobj, struct btrfs_device, 2022 devid_kobj); 2023 2024 val = !!test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state); 2025 2026 return sysfs_emit(buf, "%d\n", val); 2027 } 2028 BTRFS_ATTR(devid, replace_target, btrfs_devinfo_replace_target_show); 2029 2030 static ssize_t btrfs_devinfo_scrub_speed_max_show(struct kobject *kobj, 2031 struct kobj_attribute *a, 2032 char *buf) 2033 { 2034 struct btrfs_device *device = container_of(kobj, struct btrfs_device, 2035 devid_kobj); 2036 2037 return sysfs_emit(buf, "%llu\n", READ_ONCE(device->scrub_speed_max)); 2038 } 2039 2040 static ssize_t btrfs_devinfo_scrub_speed_max_store(struct kobject *kobj, 2041 struct kobj_attribute *a, 2042 const char *buf, size_t len) 2043 { 2044 struct btrfs_device *device = container_of(kobj, struct btrfs_device, 2045 devid_kobj); 2046 char *endptr; 2047 unsigned long long limit; 2048 2049 limit = memparse(buf, &endptr); 2050 /* There could be trailing '\n', also catch any typos after the value. */ 2051 endptr = skip_spaces(endptr); 2052 if (*endptr != 0) 2053 return -EINVAL; 2054 WRITE_ONCE(device->scrub_speed_max, limit); 2055 return len; 2056 } 2057 BTRFS_ATTR_RW(devid, scrub_speed_max, btrfs_devinfo_scrub_speed_max_show, 2058 btrfs_devinfo_scrub_speed_max_store); 2059 2060 static ssize_t btrfs_devinfo_writeable_show(struct kobject *kobj, 2061 struct kobj_attribute *a, char *buf) 2062 { 2063 int val; 2064 struct btrfs_device *device = container_of(kobj, struct btrfs_device, 2065 devid_kobj); 2066 2067 val = !!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state); 2068 2069 return sysfs_emit(buf, "%d\n", val); 2070 } 2071 BTRFS_ATTR(devid, writeable, btrfs_devinfo_writeable_show); 2072 2073 static ssize_t btrfs_devinfo_fsid_show(struct kobject *kobj, 2074 struct kobj_attribute *a, char *buf) 2075 { 2076 struct btrfs_device *device = container_of(kobj, struct btrfs_device, 2077 devid_kobj); 2078 2079 return sysfs_emit(buf, "%pU\n", device->fs_devices->fsid); 2080 } 2081 BTRFS_ATTR(devid, fsid, btrfs_devinfo_fsid_show); 2082 2083 static ssize_t btrfs_devinfo_error_stats_show(struct kobject *kobj, 2084 struct kobj_attribute *a, char *buf) 2085 { 2086 struct btrfs_device *device = container_of(kobj, struct btrfs_device, 2087 devid_kobj); 2088 2089 if (!device->dev_stats_valid) 2090 return sysfs_emit(buf, "invalid\n"); 2091 2092 /* 2093 * Print all at once so we get a snapshot of all values from the same 2094 * time. Keep them in sync and in order of definition of 2095 * btrfs_dev_stat_values. 2096 */ 2097 return sysfs_emit(buf, 2098 "write_errs %d\n" 2099 "read_errs %d\n" 2100 "flush_errs %d\n" 2101 "corruption_errs %d\n" 2102 "generation_errs %d\n", 2103 btrfs_dev_stat_read(device, BTRFS_DEV_STAT_WRITE_ERRS), 2104 btrfs_dev_stat_read(device, BTRFS_DEV_STAT_READ_ERRS), 2105 btrfs_dev_stat_read(device, BTRFS_DEV_STAT_FLUSH_ERRS), 2106 btrfs_dev_stat_read(device, BTRFS_DEV_STAT_CORRUPTION_ERRS), 2107 btrfs_dev_stat_read(device, BTRFS_DEV_STAT_GENERATION_ERRS)); 2108 } 2109 BTRFS_ATTR(devid, error_stats, btrfs_devinfo_error_stats_show); 2110 2111 /* 2112 * Information about one device. 2113 * 2114 * Path: /sys/fs/btrfs/<uuid>/devinfo/<devid>/ 2115 */ 2116 static struct attribute *devid_attrs[] = { 2117 BTRFS_ATTR_PTR(devid, error_stats), 2118 BTRFS_ATTR_PTR(devid, fsid), 2119 BTRFS_ATTR_PTR(devid, in_fs_metadata), 2120 BTRFS_ATTR_PTR(devid, missing), 2121 BTRFS_ATTR_PTR(devid, replace_target), 2122 BTRFS_ATTR_PTR(devid, scrub_speed_max), 2123 BTRFS_ATTR_PTR(devid, writeable), 2124 NULL 2125 }; 2126 ATTRIBUTE_GROUPS(devid); 2127 2128 static void btrfs_release_devid_kobj(struct kobject *kobj) 2129 { 2130 struct btrfs_device *device = container_of(kobj, struct btrfs_device, 2131 devid_kobj); 2132 2133 memset(&device->devid_kobj, 0, sizeof(struct kobject)); 2134 complete(&device->kobj_unregister); 2135 } 2136 2137 static const struct kobj_type devid_ktype = { 2138 .sysfs_ops = &kobj_sysfs_ops, 2139 .default_groups = devid_groups, 2140 .release = btrfs_release_devid_kobj, 2141 }; 2142 2143 int btrfs_sysfs_add_device(struct btrfs_device *device) 2144 { 2145 int ret; 2146 unsigned int nofs_flag; 2147 struct kobject *devices_kobj; 2148 struct kobject *devinfo_kobj; 2149 2150 /* 2151 * Make sure we use the fs_info::fs_devices to fetch the kobjects even 2152 * for the seed fs_devices 2153 */ 2154 devices_kobj = device->fs_info->fs_devices->devices_kobj; 2155 devinfo_kobj = device->fs_info->fs_devices->devinfo_kobj; 2156 ASSERT(devices_kobj); 2157 ASSERT(devinfo_kobj); 2158 2159 nofs_flag = memalloc_nofs_save(); 2160 2161 if (device->bdev) { 2162 struct kobject *disk_kobj = bdev_kobj(device->bdev); 2163 2164 ret = sysfs_create_link(devices_kobj, disk_kobj, disk_kobj->name); 2165 if (ret) { 2166 btrfs_warn(device->fs_info, 2167 "creating sysfs device link for devid %llu failed: %d", 2168 device->devid, ret); 2169 goto out; 2170 } 2171 } 2172 2173 init_completion(&device->kobj_unregister); 2174 ret = kobject_init_and_add(&device->devid_kobj, &devid_ktype, 2175 devinfo_kobj, "%llu", device->devid); 2176 if (ret) { 2177 kobject_put(&device->devid_kobj); 2178 btrfs_warn(device->fs_info, 2179 "devinfo init for devid %llu failed: %d", 2180 device->devid, ret); 2181 } 2182 2183 out: 2184 memalloc_nofs_restore(nofs_flag); 2185 return ret; 2186 } 2187 2188 static int btrfs_sysfs_add_fs_devices(struct btrfs_fs_devices *fs_devices) 2189 { 2190 int ret; 2191 struct btrfs_device *device; 2192 struct btrfs_fs_devices *seed; 2193 2194 list_for_each_entry(device, &fs_devices->devices, dev_list) { 2195 ret = btrfs_sysfs_add_device(device); 2196 if (ret) 2197 goto fail; 2198 } 2199 2200 list_for_each_entry(seed, &fs_devices->seed_list, seed_list) { 2201 list_for_each_entry(device, &seed->devices, dev_list) { 2202 ret = btrfs_sysfs_add_device(device); 2203 if (ret) 2204 goto fail; 2205 } 2206 } 2207 2208 return 0; 2209 2210 fail: 2211 btrfs_sysfs_remove_fs_devices(fs_devices); 2212 return ret; 2213 } 2214 2215 void btrfs_kobject_uevent(struct block_device *bdev, enum kobject_action action) 2216 { 2217 int ret; 2218 2219 ret = kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, action); 2220 if (ret) 2221 pr_warn("BTRFS: Sending event '%d' to kobject: '%s' (%p): failed\n", 2222 action, kobject_name(&disk_to_dev(bdev->bd_disk)->kobj), 2223 &disk_to_dev(bdev->bd_disk)->kobj); 2224 } 2225 2226 void btrfs_sysfs_update_sprout_fsid(struct btrfs_fs_devices *fs_devices) 2227 2228 { 2229 char fsid_buf[BTRFS_UUID_UNPARSED_SIZE]; 2230 2231 /* 2232 * Sprouting changes fsid of the mounted filesystem, rename the fsid 2233 * directory 2234 */ 2235 snprintf(fsid_buf, BTRFS_UUID_UNPARSED_SIZE, "%pU", fs_devices->fsid); 2236 if (kobject_rename(&fs_devices->fsid_kobj, fsid_buf)) 2237 btrfs_warn(fs_devices->fs_info, 2238 "sysfs: failed to create fsid for sprout"); 2239 } 2240 2241 void btrfs_sysfs_update_devid(struct btrfs_device *device) 2242 { 2243 char tmp[24]; 2244 2245 snprintf(tmp, sizeof(tmp), "%llu", device->devid); 2246 2247 if (kobject_rename(&device->devid_kobj, tmp)) 2248 btrfs_warn(device->fs_devices->fs_info, 2249 "sysfs: failed to update devid for %llu", 2250 device->devid); 2251 } 2252 2253 /* /sys/fs/btrfs/ entry */ 2254 static struct kset *btrfs_kset; 2255 2256 /* 2257 * Creates: 2258 * /sys/fs/btrfs/UUID 2259 * 2260 * Can be called by the device discovery thread. 2261 */ 2262 int btrfs_sysfs_add_fsid(struct btrfs_fs_devices *fs_devs) 2263 { 2264 int error; 2265 2266 init_completion(&fs_devs->kobj_unregister); 2267 fs_devs->fsid_kobj.kset = btrfs_kset; 2268 error = kobject_init_and_add(&fs_devs->fsid_kobj, &btrfs_ktype, NULL, 2269 "%pU", fs_devs->fsid); 2270 if (error) { 2271 kobject_put(&fs_devs->fsid_kobj); 2272 return error; 2273 } 2274 2275 fs_devs->devices_kobj = kobject_create_and_add("devices", 2276 &fs_devs->fsid_kobj); 2277 if (!fs_devs->devices_kobj) { 2278 btrfs_err(fs_devs->fs_info, 2279 "failed to init sysfs device interface"); 2280 btrfs_sysfs_remove_fsid(fs_devs); 2281 return -ENOMEM; 2282 } 2283 2284 fs_devs->devinfo_kobj = kobject_create_and_add("devinfo", 2285 &fs_devs->fsid_kobj); 2286 if (!fs_devs->devinfo_kobj) { 2287 btrfs_err(fs_devs->fs_info, 2288 "failed to init sysfs devinfo kobject"); 2289 btrfs_sysfs_remove_fsid(fs_devs); 2290 return -ENOMEM; 2291 } 2292 2293 return 0; 2294 } 2295 2296 int btrfs_sysfs_add_mounted(struct btrfs_fs_info *fs_info) 2297 { 2298 int error; 2299 struct btrfs_fs_devices *fs_devs = fs_info->fs_devices; 2300 struct kobject *fsid_kobj = &fs_devs->fsid_kobj; 2301 2302 error = btrfs_sysfs_add_fs_devices(fs_devs); 2303 if (error) 2304 return error; 2305 2306 error = sysfs_create_files(fsid_kobj, btrfs_attrs); 2307 if (error) { 2308 btrfs_sysfs_remove_fs_devices(fs_devs); 2309 return error; 2310 } 2311 2312 error = sysfs_create_group(fsid_kobj, 2313 &btrfs_feature_attr_group); 2314 if (error) 2315 goto failure; 2316 2317 #ifdef CONFIG_BTRFS_DEBUG 2318 fs_info->debug_kobj = kobject_create_and_add("debug", fsid_kobj); 2319 if (!fs_info->debug_kobj) { 2320 error = -ENOMEM; 2321 goto failure; 2322 } 2323 2324 error = sysfs_create_files(fs_info->debug_kobj, btrfs_debug_mount_attrs); 2325 if (error) 2326 goto failure; 2327 #endif 2328 2329 /* Discard directory */ 2330 fs_info->discard_kobj = kobject_create_and_add("discard", fsid_kobj); 2331 if (!fs_info->discard_kobj) { 2332 error = -ENOMEM; 2333 goto failure; 2334 } 2335 2336 error = sysfs_create_files(fs_info->discard_kobj, discard_attrs); 2337 if (error) 2338 goto failure; 2339 2340 error = addrm_unknown_feature_attrs(fs_info, true); 2341 if (error) 2342 goto failure; 2343 2344 error = sysfs_create_link(fsid_kobj, &fs_info->sb->s_bdi->dev->kobj, "bdi"); 2345 if (error) 2346 goto failure; 2347 2348 fs_info->space_info_kobj = kobject_create_and_add("allocation", 2349 fsid_kobj); 2350 if (!fs_info->space_info_kobj) { 2351 error = -ENOMEM; 2352 goto failure; 2353 } 2354 2355 error = sysfs_create_files(fs_info->space_info_kobj, allocation_attrs); 2356 if (error) 2357 goto failure; 2358 2359 return 0; 2360 failure: 2361 btrfs_sysfs_remove_mounted(fs_info); 2362 return error; 2363 } 2364 2365 static ssize_t qgroup_enabled_show(struct kobject *qgroups_kobj, 2366 struct kobj_attribute *a, 2367 char *buf) 2368 { 2369 struct btrfs_fs_info *fs_info = to_fs_info(qgroups_kobj->parent); 2370 bool enabled; 2371 2372 spin_lock(&fs_info->qgroup_lock); 2373 enabled = fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_ON; 2374 spin_unlock(&fs_info->qgroup_lock); 2375 2376 return sysfs_emit(buf, "%d\n", enabled); 2377 } 2378 BTRFS_ATTR(qgroups, enabled, qgroup_enabled_show); 2379 2380 static ssize_t qgroup_mode_show(struct kobject *qgroups_kobj, 2381 struct kobj_attribute *a, 2382 char *buf) 2383 { 2384 struct btrfs_fs_info *fs_info = to_fs_info(qgroups_kobj->parent); 2385 ssize_t ret = 0; 2386 2387 spin_lock(&fs_info->qgroup_lock); 2388 ASSERT(btrfs_qgroup_enabled(fs_info)); 2389 switch (btrfs_qgroup_mode(fs_info)) { 2390 case BTRFS_QGROUP_MODE_FULL: 2391 ret = sysfs_emit(buf, "qgroup\n"); 2392 break; 2393 case BTRFS_QGROUP_MODE_SIMPLE: 2394 ret = sysfs_emit(buf, "squota\n"); 2395 break; 2396 default: 2397 btrfs_warn(fs_info, "unexpected qgroup mode %d\n", 2398 btrfs_qgroup_mode(fs_info)); 2399 break; 2400 } 2401 spin_unlock(&fs_info->qgroup_lock); 2402 2403 return ret; 2404 } 2405 BTRFS_ATTR(qgroups, mode, qgroup_mode_show); 2406 2407 static ssize_t qgroup_inconsistent_show(struct kobject *qgroups_kobj, 2408 struct kobj_attribute *a, 2409 char *buf) 2410 { 2411 struct btrfs_fs_info *fs_info = to_fs_info(qgroups_kobj->parent); 2412 bool inconsistent; 2413 2414 spin_lock(&fs_info->qgroup_lock); 2415 inconsistent = (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT); 2416 spin_unlock(&fs_info->qgroup_lock); 2417 2418 return sysfs_emit(buf, "%d\n", inconsistent); 2419 } 2420 BTRFS_ATTR(qgroups, inconsistent, qgroup_inconsistent_show); 2421 2422 static ssize_t qgroup_drop_subtree_thres_show(struct kobject *qgroups_kobj, 2423 struct kobj_attribute *a, 2424 char *buf) 2425 { 2426 struct btrfs_fs_info *fs_info = to_fs_info(qgroups_kobj->parent); 2427 u8 result; 2428 2429 spin_lock(&fs_info->qgroup_lock); 2430 result = fs_info->qgroup_drop_subtree_thres; 2431 spin_unlock(&fs_info->qgroup_lock); 2432 2433 return sysfs_emit(buf, "%d\n", result); 2434 } 2435 2436 static ssize_t qgroup_drop_subtree_thres_store(struct kobject *qgroups_kobj, 2437 struct kobj_attribute *a, 2438 const char *buf, size_t len) 2439 { 2440 struct btrfs_fs_info *fs_info = to_fs_info(qgroups_kobj->parent); 2441 u8 new_thres; 2442 int ret; 2443 2444 ret = kstrtou8(buf, 10, &new_thres); 2445 if (ret) 2446 return -EINVAL; 2447 2448 if (new_thres > BTRFS_MAX_LEVEL) 2449 return -EINVAL; 2450 2451 spin_lock(&fs_info->qgroup_lock); 2452 fs_info->qgroup_drop_subtree_thres = new_thres; 2453 spin_unlock(&fs_info->qgroup_lock); 2454 2455 return len; 2456 } 2457 BTRFS_ATTR_RW(qgroups, drop_subtree_threshold, qgroup_drop_subtree_thres_show, 2458 qgroup_drop_subtree_thres_store); 2459 2460 /* 2461 * Qgroups global info 2462 * 2463 * Path: /sys/fs/btrfs/<uuid>/qgroups/ 2464 */ 2465 static struct attribute *qgroups_attrs[] = { 2466 BTRFS_ATTR_PTR(qgroups, enabled), 2467 BTRFS_ATTR_PTR(qgroups, inconsistent), 2468 BTRFS_ATTR_PTR(qgroups, drop_subtree_threshold), 2469 BTRFS_ATTR_PTR(qgroups, mode), 2470 NULL 2471 }; 2472 ATTRIBUTE_GROUPS(qgroups); 2473 2474 static void qgroups_release(struct kobject *kobj) 2475 { 2476 kfree(kobj); 2477 } 2478 2479 static const struct kobj_type qgroups_ktype = { 2480 .sysfs_ops = &kobj_sysfs_ops, 2481 .default_groups = qgroups_groups, 2482 .release = qgroups_release, 2483 }; 2484 2485 static inline struct btrfs_fs_info *qgroup_kobj_to_fs_info(struct kobject *kobj) 2486 { 2487 return to_fs_info(kobj->parent->parent); 2488 } 2489 2490 #define QGROUP_ATTR(_member, _show_name) \ 2491 static ssize_t btrfs_qgroup_show_##_member(struct kobject *qgroup_kobj, \ 2492 struct kobj_attribute *a, \ 2493 char *buf) \ 2494 { \ 2495 struct btrfs_fs_info *fs_info = qgroup_kobj_to_fs_info(qgroup_kobj); \ 2496 struct btrfs_qgroup *qgroup = container_of(qgroup_kobj, \ 2497 struct btrfs_qgroup, kobj); \ 2498 return btrfs_show_u64(&qgroup->_member, &fs_info->qgroup_lock, buf); \ 2499 } \ 2500 BTRFS_ATTR(qgroup, _show_name, btrfs_qgroup_show_##_member) 2501 2502 #define QGROUP_RSV_ATTR(_name, _type) \ 2503 static ssize_t btrfs_qgroup_rsv_show_##_name(struct kobject *qgroup_kobj, \ 2504 struct kobj_attribute *a, \ 2505 char *buf) \ 2506 { \ 2507 struct btrfs_fs_info *fs_info = qgroup_kobj_to_fs_info(qgroup_kobj); \ 2508 struct btrfs_qgroup *qgroup = container_of(qgroup_kobj, \ 2509 struct btrfs_qgroup, kobj); \ 2510 return btrfs_show_u64(&qgroup->rsv.values[_type], \ 2511 &fs_info->qgroup_lock, buf); \ 2512 } \ 2513 BTRFS_ATTR(qgroup, rsv_##_name, btrfs_qgroup_rsv_show_##_name) 2514 2515 QGROUP_ATTR(rfer, referenced); 2516 QGROUP_ATTR(excl, exclusive); 2517 QGROUP_ATTR(max_rfer, max_referenced); 2518 QGROUP_ATTR(max_excl, max_exclusive); 2519 QGROUP_ATTR(lim_flags, limit_flags); 2520 QGROUP_RSV_ATTR(data, BTRFS_QGROUP_RSV_DATA); 2521 QGROUP_RSV_ATTR(meta_pertrans, BTRFS_QGROUP_RSV_META_PERTRANS); 2522 QGROUP_RSV_ATTR(meta_prealloc, BTRFS_QGROUP_RSV_META_PREALLOC); 2523 2524 /* 2525 * Qgroup information. 2526 * 2527 * Path: /sys/fs/btrfs/<uuid>/qgroups/<level>_<qgroupid>/ 2528 */ 2529 static struct attribute *qgroup_attrs[] = { 2530 BTRFS_ATTR_PTR(qgroup, referenced), 2531 BTRFS_ATTR_PTR(qgroup, exclusive), 2532 BTRFS_ATTR_PTR(qgroup, max_referenced), 2533 BTRFS_ATTR_PTR(qgroup, max_exclusive), 2534 BTRFS_ATTR_PTR(qgroup, limit_flags), 2535 BTRFS_ATTR_PTR(qgroup, rsv_data), 2536 BTRFS_ATTR_PTR(qgroup, rsv_meta_pertrans), 2537 BTRFS_ATTR_PTR(qgroup, rsv_meta_prealloc), 2538 NULL 2539 }; 2540 ATTRIBUTE_GROUPS(qgroup); 2541 2542 static void qgroup_release(struct kobject *kobj) 2543 { 2544 struct btrfs_qgroup *qgroup = container_of(kobj, struct btrfs_qgroup, kobj); 2545 2546 memset(&qgroup->kobj, 0, sizeof(*kobj)); 2547 } 2548 2549 static const struct kobj_type qgroup_ktype = { 2550 .sysfs_ops = &kobj_sysfs_ops, 2551 .release = qgroup_release, 2552 .default_groups = qgroup_groups, 2553 }; 2554 2555 int btrfs_sysfs_add_one_qgroup(struct btrfs_fs_info *fs_info, 2556 struct btrfs_qgroup *qgroup) 2557 { 2558 struct kobject *qgroups_kobj = fs_info->qgroups_kobj; 2559 int ret; 2560 2561 if (btrfs_is_testing(fs_info)) 2562 return 0; 2563 if (qgroup->kobj.state_initialized) 2564 return 0; 2565 if (!qgroups_kobj) 2566 return -EINVAL; 2567 2568 ret = kobject_init_and_add(&qgroup->kobj, &qgroup_ktype, qgroups_kobj, 2569 "%hu_%llu", btrfs_qgroup_level(qgroup->qgroupid), 2570 btrfs_qgroup_subvolid(qgroup->qgroupid)); 2571 if (ret < 0) 2572 kobject_put(&qgroup->kobj); 2573 2574 return ret; 2575 } 2576 2577 void btrfs_sysfs_del_qgroups(struct btrfs_fs_info *fs_info) 2578 { 2579 struct btrfs_qgroup *qgroup; 2580 struct btrfs_qgroup *next; 2581 2582 if (btrfs_is_testing(fs_info)) 2583 return; 2584 2585 rbtree_postorder_for_each_entry_safe(qgroup, next, 2586 &fs_info->qgroup_tree, node) 2587 btrfs_sysfs_del_one_qgroup(fs_info, qgroup); 2588 if (fs_info->qgroups_kobj) { 2589 kobject_del(fs_info->qgroups_kobj); 2590 kobject_put(fs_info->qgroups_kobj); 2591 fs_info->qgroups_kobj = NULL; 2592 } 2593 } 2594 2595 /* Called when qgroups get initialized, thus there is no need for locking */ 2596 int btrfs_sysfs_add_qgroups(struct btrfs_fs_info *fs_info) 2597 { 2598 struct kobject *fsid_kobj = &fs_info->fs_devices->fsid_kobj; 2599 struct btrfs_qgroup *qgroup; 2600 struct btrfs_qgroup *next; 2601 int ret = 0; 2602 2603 if (btrfs_is_testing(fs_info)) 2604 return 0; 2605 2606 ASSERT(fsid_kobj); 2607 if (fs_info->qgroups_kobj) 2608 return 0; 2609 2610 fs_info->qgroups_kobj = kzalloc(sizeof(struct kobject), GFP_KERNEL); 2611 if (!fs_info->qgroups_kobj) 2612 return -ENOMEM; 2613 2614 ret = kobject_init_and_add(fs_info->qgroups_kobj, &qgroups_ktype, 2615 fsid_kobj, "qgroups"); 2616 if (ret < 0) 2617 goto out; 2618 2619 rbtree_postorder_for_each_entry_safe(qgroup, next, 2620 &fs_info->qgroup_tree, node) { 2621 ret = btrfs_sysfs_add_one_qgroup(fs_info, qgroup); 2622 if (ret < 0) 2623 goto out; 2624 } 2625 2626 out: 2627 if (ret < 0) 2628 btrfs_sysfs_del_qgroups(fs_info); 2629 return ret; 2630 } 2631 2632 void btrfs_sysfs_del_one_qgroup(struct btrfs_fs_info *fs_info, 2633 struct btrfs_qgroup *qgroup) 2634 { 2635 if (btrfs_is_testing(fs_info)) 2636 return; 2637 2638 if (qgroup->kobj.state_initialized) { 2639 kobject_del(&qgroup->kobj); 2640 kobject_put(&qgroup->kobj); 2641 } 2642 } 2643 2644 /* 2645 * Change per-fs features in /sys/fs/btrfs/UUID/features to match current 2646 * values in superblock. Call after any changes to incompat/compat_ro flags 2647 */ 2648 void btrfs_sysfs_feature_update(struct btrfs_fs_info *fs_info) 2649 { 2650 struct kobject *fsid_kobj; 2651 int ret; 2652 2653 if (!fs_info) 2654 return; 2655 2656 fsid_kobj = &fs_info->fs_devices->fsid_kobj; 2657 if (!fsid_kobj->state_initialized) 2658 return; 2659 2660 ret = sysfs_update_group(fsid_kobj, &btrfs_feature_attr_group); 2661 if (ret < 0) 2662 btrfs_warn(fs_info, 2663 "failed to update /sys/fs/btrfs/%pU/features: %d", 2664 fs_info->fs_devices->fsid, ret); 2665 } 2666 2667 int __init btrfs_init_sysfs(void) 2668 { 2669 int ret; 2670 2671 btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj); 2672 if (!btrfs_kset) 2673 return -ENOMEM; 2674 2675 init_feature_attrs(); 2676 ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); 2677 if (ret) 2678 goto out2; 2679 ret = sysfs_merge_group(&btrfs_kset->kobj, 2680 &btrfs_static_feature_attr_group); 2681 if (ret) 2682 goto out_remove_group; 2683 2684 #ifdef CONFIG_BTRFS_DEBUG 2685 ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_debug_feature_attr_group); 2686 if (ret) { 2687 sysfs_unmerge_group(&btrfs_kset->kobj, 2688 &btrfs_static_feature_attr_group); 2689 goto out_remove_group; 2690 } 2691 #endif 2692 2693 return 0; 2694 2695 out_remove_group: 2696 sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); 2697 out2: 2698 kset_unregister(btrfs_kset); 2699 2700 return ret; 2701 } 2702 2703 void __cold btrfs_exit_sysfs(void) 2704 { 2705 sysfs_unmerge_group(&btrfs_kset->kobj, 2706 &btrfs_static_feature_attr_group); 2707 sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); 2708 #ifdef CONFIG_BTRFS_DEBUG 2709 sysfs_remove_group(&btrfs_kset->kobj, &btrfs_debug_feature_attr_group); 2710 #endif 2711 kset_unregister(btrfs_kset); 2712 } 2713