2577 lines · c
1// SPDX-License-Identifier: GPL-2.02/*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 Path31 * --------------------------------------------------------------------------32 * btrfs_supported_static_feature_attrs /sys/fs/btrfs/features33 * btrfs_supported_feature_attrs /sys/fs/btrfs/features and34 * /sys/fs/btrfs/<uuid>/features35 * btrfs_attrs /sys/fs/btrfs/<uuid>36 * devid_attrs /sys/fs/btrfs/<uuid>/devinfo/<devid>37 * allocation_attrs /sys/fs/btrfs/<uuid>/allocation38 * 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>/discard42 *43 * When built with BTRFS_CONFIG_DEBUG:44 *45 * btrfs_debug_feature_attrs /sys/fs/btrfs/debug46 * btrfs_debug_mount_attrs /sys/fs/btrfs/<uuid>/debug47 */48 49struct 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 */56struct 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) \84static 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 101static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj);102static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj);103static struct kobject *get_btrfs_kobj(struct kobject *kobj);104 105static 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 110static struct kobj_attribute *attr_to_btrfs_attr(struct attribute *attr)111{112 return container_of(attr, struct kobj_attribute, attr);113}114 115static 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 121static 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 else130 return btrfs_super_incompat_flags(disk_super);131}132 133static 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 else142 btrfs_set_super_incompat_flags(disk_super, features);143}144 145static 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 176static 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 } else187 val = can_modify_feature(fa);188 189 return sysfs_emit(buf, "%d\n", val);190}191 192static 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 else247 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 sysfs253 */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 260static 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 282BTRFS_FEAT_ATTR_INCOMPAT(default_subvol, DEFAULT_SUBVOL);283BTRFS_FEAT_ATTR_INCOMPAT(mixed_groups, MIXED_GROUPS);284BTRFS_FEAT_ATTR_INCOMPAT(compress_lzo, COMPRESS_LZO);285BTRFS_FEAT_ATTR_INCOMPAT(compress_zstd, COMPRESS_ZSTD);286BTRFS_FEAT_ATTR_INCOMPAT(extended_iref, EXTENDED_IREF);287BTRFS_FEAT_ATTR_INCOMPAT(raid56, RAID56);288BTRFS_FEAT_ATTR_INCOMPAT(skinny_metadata, SKINNY_METADATA);289BTRFS_FEAT_ATTR_INCOMPAT(no_holes, NO_HOLES);290BTRFS_FEAT_ATTR_INCOMPAT(metadata_uuid, METADATA_UUID);291BTRFS_FEAT_ATTR_COMPAT_RO(free_space_tree, FREE_SPACE_TREE);292BTRFS_FEAT_ATTR_COMPAT_RO(block_group_tree, BLOCK_GROUP_TREE);293BTRFS_FEAT_ATTR_INCOMPAT(raid1c34, RAID1C34);294BTRFS_FEAT_ATTR_INCOMPAT(simple_quota, SIMPLE_QUOTA);295#ifdef CONFIG_BLK_DEV_ZONED296BTRFS_FEAT_ATTR_INCOMPAT(zoned, ZONED);297#endif298#ifdef CONFIG_BTRFS_DEBUG299/* Remove once support for extent tree v2 is feature complete */300BTRFS_FEAT_ATTR_INCOMPAT(extent_tree_v2, EXTENT_TREE_V2);301/* Remove once support for raid stripe tree is feature complete. */302BTRFS_FEAT_ATTR_INCOMPAT(raid_stripe_tree, RAID_STRIPE_TREE);303#endif304#ifdef CONFIG_FS_VERITY305BTRFS_FEAT_ATTR_COMPAT_RO(verity, VERITY);306#endif307 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 version312 * /sys/fs/btrfs/UUID/features - features of the fs which are enabled or313 * can be changed on a mounted filesystem.314 */315static 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_ZONED330 BTRFS_FEAT_ATTR_PTR(zoned),331#endif332#ifdef CONFIG_BTRFS_DEBUG333 BTRFS_FEAT_ATTR_PTR(extent_tree_v2),334 BTRFS_FEAT_ATTR_PTR(raid_stripe_tree),335#endif336#ifdef CONFIG_FS_VERITY337 BTRFS_FEAT_ATTR_PTR(verity),338#endif339 NULL340};341 342static 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 348static ssize_t rmdir_subvol_show(struct kobject *kobj,349 struct kobj_attribute *ka, char *buf)350{351 return sysfs_emit(buf, "0\n");352}353BTRFS_ATTR(static_feature, rmdir_subvol, rmdir_subvol_show);354 355static 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' has364 * no holes in it365 */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}374BTRFS_ATTR(static_feature, supported_checksums, supported_checksums_show);375 376static 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}381BTRFS_ATTR(static_feature, send_stream_version, send_stream_version_show);382 383static const char *rescue_opts[] = {384 "usebackuproot",385 "nologreplay",386 "ignorebadroots",387 "ignoredatacsums",388 "ignoremetacsums",389 "ignoresuperflags",390 "all",391};392 393static 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}405BTRFS_ATTR(static_feature, supported_rescue_options,406 supported_rescue_options_show);407 408static 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}421BTRFS_ATTR(static_feature, supported_sectorsizes,422 supported_sectorsizes_show);423 424static 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}428BTRFS_ATTR(static_feature, acl, acl_show);429 430static 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}435BTRFS_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 with441 * btrfs_supported_feature_attrs.442 */443static 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 NULL452};453 454static 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 tunables461 */462#define discard_to_fs_info(_kobj) to_fs_info(get_btrfs_kobj(_kobj))463 464static 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}473BTRFS_ATTR(discard, discardable_bytes, btrfs_discardable_bytes_show);474 475static 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}484BTRFS_ATTR(discard, discardable_extents, btrfs_discardable_extents_show);485 486static 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}495BTRFS_ATTR(discard, discard_bitmap_bytes, btrfs_discard_bitmap_bytes_show);496 497static 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}506BTRFS_ATTR(discard, discard_bytes_saved, btrfs_discard_bytes_saved_show);507 508static 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}517BTRFS_ATTR(discard, discard_extent_bytes, btrfs_discard_extent_bytes_show);518 519static 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 529static 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}547BTRFS_ATTR_RW(discard, iops_limit, btrfs_discard_iops_limit_show,548 btrfs_discard_iops_limit_store);549 550static 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 560static 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}577BTRFS_ATTR_RW(discard, kbps_limit, btrfs_discard_kbps_limit_show,578 btrfs_discard_kbps_limit_store);579 580static 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 590static 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}607BTRFS_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 */615static 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_DEBUG628 629/*630 * Per-filesystem runtime debugging exported via sysfs.631 *632 * Path: /sys/fs/btrfs/UUID/debug/633 */634static 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/debug642 */643static struct attribute *btrfs_debug_feature_attrs[] = {644 NULL645};646 647static const struct attribute_group btrfs_debug_feature_attr_group = {648 .name = "debug",649 .attrs = btrfs_debug_feature_attrs,650};651 652#endif653 654static 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 665static 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}672BTRFS_ATTR(allocation, global_rsv_size, global_rsv_size_show);673 674static 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}681BTRFS_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 686static ssize_t raid_bytes_show(struct kobject *kobj,687 struct kobj_attribute *attr, char *buf);688BTRFS_ATTR(raid, total_bytes, raid_bytes_show);689BTRFS_ATTR(raid, used_bytes, raid_bytes_show);690 691static 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 else705 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 */716static struct attribute *raid_attrs[] = {717 BTRFS_ATTR_PTR(raid, total_bytes),718 BTRFS_ATTR_PTR(raid, used_bytes),719 NULL720};721ATTRIBUTE_GROUPS(raid);722 723static void release_raid_kobj(struct kobject *kobj)724{725 kfree(to_raid_kobj(kobj));726}727 728static 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) \735static 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} \742BTRFS_ATTR(space_info, field, btrfs_space_info_show_##field)743 744static 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 reduced756 * to match that limit. Alignment must be to 256M and the system chunk size757 * cannot be set.758 */759static 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 804static 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_DEBUG844/*845 * Request chunk allocation with current chunk size.846 */847static 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 cause872 * 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}885BTRFS_ATTR_W(space_info, force_chunk_alloc, btrfs_force_chunk_alloc_store);886 887#endif888 889SPACE_INFO_ATTR(flags);890SPACE_INFO_ATTR(total_bytes);891SPACE_INFO_ATTR(bytes_used);892SPACE_INFO_ATTR(bytes_pinned);893SPACE_INFO_ATTR(bytes_reserved);894SPACE_INFO_ATTR(bytes_may_use);895SPACE_INFO_ATTR(bytes_readonly);896SPACE_INFO_ATTR(bytes_zone_unusable);897SPACE_INFO_ATTR(disk_used);898SPACE_INFO_ATTR(disk_total);899SPACE_INFO_ATTR(reclaim_count);900SPACE_INFO_ATTR(reclaim_bytes);901SPACE_INFO_ATTR(reclaim_errors);902BTRFS_ATTR_RW(space_info, chunk_size, btrfs_chunk_size_show, btrfs_chunk_size_store);903BTRFS_ATTR(space_info, size_classes, btrfs_size_classes_show);904 905static 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 918static 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 941BTRFS_ATTR_RW(space_info, bg_reclaim_threshold,942 btrfs_sinfo_bg_reclaim_threshold_show,943 btrfs_sinfo_bg_reclaim_threshold_store);944 945static 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 954static 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 974BTRFS_ATTR_RW(space_info, dynamic_reclaim,975 btrfs_sinfo_dynamic_reclaim_show,976 btrfs_sinfo_dynamic_reclaim_store);977 978static 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 987static 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 1007BTRFS_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 */1016static 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_DEBUG1036 BTRFS_ATTR_PTR(space_info, force_chunk_alloc),1037#endif1038 NULL,1039};1040ATTRIBUTE_GROUPS(space_info);1041 1042static void space_info_release(struct kobject *kobj)1043{1044 struct btrfs_space_info *sinfo = to_space_info(kobj);1045 kfree(sinfo);1046}1047 1048static 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 */1059static 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 1065static 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 1079static 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 either1094 * '\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 sysfs1108 */1109 set_bit(BTRFS_FS_NEED_TRANS_COMMIT, &fs_info->flags);1110 wake_up_process(fs_info->transaction_kthread);1111 1112 return len;1113}1114BTRFS_ATTR_RW(, label, btrfs_label_show, btrfs_label_store);1115 1116static 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 1124BTRFS_ATTR(, nodesize, btrfs_nodesize_show);1125 1126static 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 1134BTRFS_ATTR(, sectorsize, btrfs_sectorsize_show);1135 1136static 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 1152static 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}1176BTRFS_ATTR_RW(, commit_stats, btrfs_commit_stats_show, btrfs_commit_stats_store);1177 1178static 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 1186BTRFS_ATTR(, clone_alignment, btrfs_clone_alignment_show);1187 1188static 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 1198static 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 else1221 clear_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags);1222 1223 return len;1224}1225 1226BTRFS_ATTR_RW(, quota_override, quota_override_show, quota_override_store);1227 1228static 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 1236BTRFS_ATTR(, metadata_uuid, btrfs_metadata_uuid_show);1237 1238static 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 1249BTRFS_ATTR(, checksum, btrfs_checksum_show);1250 1251static 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}1288BTRFS_ATTR(, exclusive_operation, btrfs_exclusive_operation_show);1289 1290static 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}1297BTRFS_ATTR(, generation, btrfs_generation_show);1298 1299static 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}1306BTRFS_ATTR(, temp_fsid, btrfs_temp_fsid_show);1307 1308static const char * const btrfs_read_policy_name[] = { "pid" };1309 1310static 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 else1324 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 1334static 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}1355BTRFS_ATTR_RW(, read_policy, btrfs_read_policy_show, btrfs_read_policy_store);1356 1357static 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 1366static 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_DEBUG1379 if (thresh != 0 && (thresh > 100))1380 return -EINVAL;1381#else1382 if (thresh != 0 && (thresh <= 50 || thresh > 100))1383 return -EINVAL;1384#endif1385 1386 WRITE_ONCE(fs_info->bg_reclaim_threshold, thresh);1387 1388 return len;1389}1390BTRFS_ATTR_RW(, bg_reclaim_threshold, btrfs_bg_reclaim_threshold_show,1391 btrfs_bg_reclaim_threshold_store);1392 1393#ifdef CONFIG_BTRFS_DEBUG1394static 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 1412static 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 else1427 return -EINVAL;1428 1429 return len;1430}1431BTRFS_ATTR_RW(, offload_csum, btrfs_offload_csum_show, btrfs_offload_csum_store);1432#endif1433 1434/*1435 * Per-filesystem information and stats.1436 *1437 * Path: /sys/fs/btrfs/<uuid>/1438 */1439static 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_DEBUG1454 BTRFS_ATTR_PTR(, offload_csum),1455#endif1456 NULL,1457};1458 1459static 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 1467static const struct kobj_type btrfs_ktype = {1468 .sysfs_ops = &kobj_sysfs_ops,1469 .release = btrfs_release_fsid_kobj,1470};1471 1472static 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 1479static 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 1486static 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 641497#define BTRFS_FEATURE_NAME_MAX 131498static char btrfs_unknown_feature_names[FEAT_MAX][NUM_FEATURE_BITS][BTRFS_FEATURE_NAME_MAX];1499static struct btrfs_feature_attr btrfs_feature_attrs[FEAT_MAX][NUM_FEATURE_BITS];1500 1501static_assert(ARRAY_SIZE(btrfs_unknown_feature_names) ==1502 ARRAY_SIZE(btrfs_feature_attrs));1503static_assert(ARRAY_SIZE(btrfs_unknown_feature_names[0]) ==1504 ARRAY_SIZE(btrfs_feature_attrs[0]));1505 1506static 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 1512static 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 } else1545 sysfs_unmerge_group(&fs_info->fs_devices->fsid_kobj,1546 &agroup);1547 }1548 1549 }1550 return 0;1551}1552 1553static 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 */1575void 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 1589static 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 1603void 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_DEBUG1620 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#endif1626 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 1632static 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 1638const char *btrfs_feature_set_name(enum btrfs_feature_set set)1639{1640 return btrfs_feature_set_names[set];1641}1642 1643char *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 1668static 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 path1709 * /sys/fs/btrfs/UUID/allocation/data/TYPE1710 */1711void 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 context1723 * where if reclaim is triggered we can deadlock (we are either holding1724 * a transaction handle or some lock required for a transaction1725 * 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 a1742 * new index type while running (i.e. when restriping). The running1743 * case is tricky because we could race with other threads, so we need1744 * 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 on1747 * 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 and1775 * the space info as well1776 */1777void 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 1795static 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 path1814 * /sys/fs/btrfs/UUID/allocation/TYPE1815 */1816int 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 1832void 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 the1838 * 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 1853static 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}1865BTRFS_ATTR(devid, in_fs_metadata, btrfs_devinfo_in_fs_metadata_show);1866 1867static 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}1878BTRFS_ATTR(devid, missing, btrfs_devinfo_missing_show);1879 1880static 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}1892BTRFS_ATTR(devid, replace_target, btrfs_devinfo_replace_target_show);1893 1894static 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 1904static 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}1921BTRFS_ATTR_RW(devid, scrub_speed_max, btrfs_devinfo_scrub_speed_max_show,1922 btrfs_devinfo_scrub_speed_max_store);1923 1924static 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}1935BTRFS_ATTR(devid, writeable, btrfs_devinfo_writeable_show);1936 1937static 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}1945BTRFS_ATTR(devid, fsid, btrfs_devinfo_fsid_show);1946 1947static 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 same1958 * time. Keep them in sync and in order of definition of1959 * 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}1973BTRFS_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 */1980static 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 NULL1989};1990ATTRIBUTE_GROUPS(devid);1991 1992static 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 2001static 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 2007int 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 even2016 * for the seed fs_devices2017 */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 2047out:2048 memalloc_nofs_restore(nofs_flag);2049 return ret;2050}2051 2052static 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 2074fail:2075 btrfs_sysfs_remove_fs_devices(fs_devices);2076 return ret;2077}2078 2079void 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 2090void 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 fsid2097 * directory2098 */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 2105void 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 */2118static struct kset *btrfs_kset;2119 2120/*2121 * Creates:2122 * /sys/fs/btrfs/UUID2123 *2124 * Can be called by the device discovery thread.2125 */2126int 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 2160int 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_DEBUG2182 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#endif2192 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;2224failure:2225 btrfs_sysfs_remove_mounted(fs_info);2226 return error;2227}2228 2229static 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}2242BTRFS_ATTR(qgroups, enabled, qgroup_enabled_show);2243 2244static 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}2269BTRFS_ATTR(qgroups, mode, qgroup_mode_show);2270 2271static 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}2284BTRFS_ATTR(qgroups, inconsistent, qgroup_inconsistent_show);2285 2286static 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 2300static 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}2321BTRFS_ATTR_RW(qgroups, drop_subtree_threshold, qgroup_drop_subtree_thres_show,2322 qgroup_drop_subtree_thres_store);2323 2324/*2325 * Qgroups global info2326 *2327 * Path: /sys/fs/btrfs/<uuid>/qgroups/2328 */2329static 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 NULL2335};2336ATTRIBUTE_GROUPS(qgroups);2337 2338static void qgroups_release(struct kobject *kobj)2339{2340 kfree(kobj);2341}2342 2343static const struct kobj_type qgroups_ktype = {2344 .sysfs_ops = &kobj_sysfs_ops,2345 .default_groups = qgroups_groups,2346 .release = qgroups_release,2347};2348 2349static 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) \2355static 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} \2364BTRFS_ATTR(qgroup, _show_name, btrfs_qgroup_show_##_member)2365 2366#define QGROUP_RSV_ATTR(_name, _type) \2367static 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} \2377BTRFS_ATTR(qgroup, rsv_##_name, btrfs_qgroup_rsv_show_##_name)2378 2379QGROUP_ATTR(rfer, referenced);2380QGROUP_ATTR(excl, exclusive);2381QGROUP_ATTR(max_rfer, max_referenced);2382QGROUP_ATTR(max_excl, max_exclusive);2383QGROUP_ATTR(lim_flags, limit_flags);2384QGROUP_RSV_ATTR(data, BTRFS_QGROUP_RSV_DATA);2385QGROUP_RSV_ATTR(meta_pertrans, BTRFS_QGROUP_RSV_META_PERTRANS);2386QGROUP_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 */2393static 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 NULL2403};2404ATTRIBUTE_GROUPS(qgroup);2405 2406static 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 2413static const struct kobj_type qgroup_ktype = {2414 .sysfs_ops = &kobj_sysfs_ops,2415 .release = qgroup_release,2416 .default_groups = qgroup_groups,2417};2418 2419int 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 2441void 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 */2460int 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 2490out:2491 if (ret < 0)2492 btrfs_sysfs_del_qgroups(fs_info);2493 return ret;2494}2495 2496void 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 current2510 * values in superblock. Call after any changes to incompat/compat_ro flags2511 */2512void 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 2531int __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_DEBUG2549 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#endif2556 2557 return 0;2558 2559out_remove_group:2560 sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group);2561out2:2562 kset_unregister(btrfs_kset);2563 2564 return ret;2565}2566 2567void __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_DEBUG2573 sysfs_remove_group(&btrfs_kset->kobj, &btrfs_debug_feature_attr_group);2574#endif2575 kset_unregister(btrfs_kset);2576}2577