123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420421422423424425426427428429430431432433434435436437438439440441442443444445446447448449450451452453454455456457458459460461462463464465466467468469470471472473474475476477478479480481482483484485486487488489490491492493494495496497498499500501502503504505506507508509510511512513514515516517518519520521522523524525526527528529530531532533534535536537538539540541542543544545546547548549550551552553554555556557558559560561562563564565566567568569570571572573574575576577578579580581582583584585586587588589590591592593594595596597598599600601602603604605606607608609610611612613614615616617618619620621622623624625626627628629630631632633634635636637638639640641642643644645646647648649650651652653654655656657658659660661662663664665666667668669670671672673674675676677678679680681682683684685686687688689690691692693694695696697698699700701702703704705706707708709710711712713714715716717718719720721722723724725726727728729730731732733734735736737738739740741742743744745746747748749750751752753754755756757758759760761762763764765766767768769770771772773774775776777778779780781782783784785786787788789790791792793794795796797798799800801802803804805806807808809810811812813814815816817818819820821822823824825826827828829830831832833834835836837838839840841842843844845846847848849850851852853854855856857858859860861862863864865866867868869870871872873874875876877878879880881882883884885886887888889890891892893894895896897898899900901902903904905906907908909910911912913914915916917918919920921922923924925926927928929930931932933934935936937938939940941942943944945946947948949950951952953954955956957958959960961962963964965966967968969970971972973974975976977978979980981982983984985986987988989990991992993994995996997998999100010011002100310041005100610071008100910101011101210131014101510161017101810191020102110221023102410251026102710281029103010311032103310341035103610371038103910401041104210431044104510461047104810491050105110521053105410551056105710581059106010611062106310641065106610671068106910701071107210731074107510761077107810791080108110821083108410851086108710881089109010911092109310941095109610971098109911001101110211031104110511061107110811091110111111121113111411151116111711181119112011211122112311241125112611271128112911301131113211331134113511361137113811391140114111421143114411451146114711481149115011511152115311541155115611571158115911601161116211631164116511661167116811691170117111721173117411751176117711781179118011811182118311841185118611871188118911901191119211931194119511961197119811991200120112021203120412051206120712081209121012111212121312141215121612171218121912201221122212231224122512261227122812291230123112321233123412351236123712381239124012411242124312441245124612471248124912501251125212531254125512561257125812591260126112621263126412651266126712681269127012711272127312741275127612771278127912801281128212831284128512861287128812891290129112921293129412951296129712981299130013011302130313041305130613071308130913101311131213131314131513161317131813191320132113221323132413251326132713281329133013311332133313341335133613371338133913401341134213431344134513461347134813491350135113521353135413551356135713581359136013611362136313641365136613671368136913701371137213731374137513761377137813791380138113821383138413851386138713881389139013911392139313941395139613971398139914001401140214031404140514061407140814091410141114121413141414151416141714181419142014211422142314241425142614271428142914301431143214331434143514361437143814391440144114421443144414451446144714481449145014511452145314541455145614571458145914601461146214631464146514661467146814691470147114721473147414751476147714781479148014811482148314841485148614871488148914901491149214931494149514961497149814991500150115021503150415051506150715081509151015111512151315141515151615171518151915201521152215231524152515261527152815291530153115321533153415351536153715381539154015411542154315441545154615471548154915501551155215531554155515561557155815591560156115621563156415651566156715681569157015711572157315741575157615771578157915801581158215831584158515861587158815891590159115921593159415951596159715981599160016011602160316041605160616071608160916101611161216131614161516161617161816191620162116221623162416251626162716281629163016311632163316341635163616371638163916401641164216431644164516461647164816491650165116521653165416551656165716581659166016611662166316641665166616671668166916701671167216731674167516761677167816791680168116821683168416851686168716881689169016911692169316941695169616971698169917001701170217031704170517061707170817091710171117121713171417151716171717181719172017211722172317241725172617271728172917301731173217331734173517361737173817391740174117421743174417451746174717481749175017511752175317541755175617571758175917601761176217631764176517661767176817691770177117721773177417751776177717781779178017811782178317841785178617871788178917901791179217931794 |
- // SPDX-License-Identifier: GPL-2.0
- /*
- * Copyright (C) 2007 Oracle. All rights reserved.
- */
- #include <linux/sched.h>
- #include <linux/sched/mm.h>
- #include <linux/slab.h>
- #include <linux/spinlock.h>
- #include <linux/completion.h>
- #include <linux/bug.h>
- #include <crypto/hash.h>
- #include "ctree.h"
- #include "discard.h"
- #include "disk-io.h"
- #include "send.h"
- #include "transaction.h"
- #include "sysfs.h"
- #include "volumes.h"
- #include "space-info.h"
- #include "block-group.h"
- #include "qgroup.h"
- struct btrfs_feature_attr {
- struct kobj_attribute kobj_attr;
- enum btrfs_feature_set feature_set;
- u64 feature_bit;
- };
- /* For raid type sysfs entries */
- struct raid_kobject {
- u64 flags;
- struct kobject kobj;
- };
- #define __INIT_KOBJ_ATTR(_name, _mode, _show, _store) \
- { \
- .attr = { .name = __stringify(_name), .mode = _mode }, \
- .show = _show, \
- .store = _store, \
- }
- #define BTRFS_ATTR_RW(_prefix, _name, _show, _store) \
- static struct kobj_attribute btrfs_attr_##_prefix##_##_name = \
- __INIT_KOBJ_ATTR(_name, 0644, _show, _store)
- #define BTRFS_ATTR(_prefix, _name, _show) \
- static struct kobj_attribute btrfs_attr_##_prefix##_##_name = \
- __INIT_KOBJ_ATTR(_name, 0444, _show, NULL)
- #define BTRFS_ATTR_PTR(_prefix, _name) \
- (&btrfs_attr_##_prefix##_##_name.attr)
- #define BTRFS_FEAT_ATTR(_name, _feature_set, _feature_prefix, _feature_bit) \
- static struct btrfs_feature_attr btrfs_attr_features_##_name = { \
- .kobj_attr = __INIT_KOBJ_ATTR(_name, S_IRUGO, \
- btrfs_feature_attr_show, \
- btrfs_feature_attr_store), \
- .feature_set = _feature_set, \
- .feature_bit = _feature_prefix ##_## _feature_bit, \
- }
- #define BTRFS_FEAT_ATTR_PTR(_name) \
- (&btrfs_attr_features_##_name.kobj_attr.attr)
- #define BTRFS_FEAT_ATTR_COMPAT(name, feature) \
- BTRFS_FEAT_ATTR(name, FEAT_COMPAT, BTRFS_FEATURE_COMPAT, feature)
- #define BTRFS_FEAT_ATTR_COMPAT_RO(name, feature) \
- BTRFS_FEAT_ATTR(name, FEAT_COMPAT_RO, BTRFS_FEATURE_COMPAT_RO, feature)
- #define BTRFS_FEAT_ATTR_INCOMPAT(name, feature) \
- BTRFS_FEAT_ATTR(name, FEAT_INCOMPAT, BTRFS_FEATURE_INCOMPAT, feature)
- static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj);
- static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj);
- static struct btrfs_feature_attr *to_btrfs_feature_attr(struct kobj_attribute *a)
- {
- return container_of(a, struct btrfs_feature_attr, kobj_attr);
- }
- static struct kobj_attribute *attr_to_btrfs_attr(struct attribute *attr)
- {
- return container_of(attr, struct kobj_attribute, attr);
- }
- static struct btrfs_feature_attr *attr_to_btrfs_feature_attr(
- struct attribute *attr)
- {
- return to_btrfs_feature_attr(attr_to_btrfs_attr(attr));
- }
- static u64 get_features(struct btrfs_fs_info *fs_info,
- enum btrfs_feature_set set)
- {
- struct btrfs_super_block *disk_super = fs_info->super_copy;
- if (set == FEAT_COMPAT)
- return btrfs_super_compat_flags(disk_super);
- else if (set == FEAT_COMPAT_RO)
- return btrfs_super_compat_ro_flags(disk_super);
- else
- return btrfs_super_incompat_flags(disk_super);
- }
- static void set_features(struct btrfs_fs_info *fs_info,
- enum btrfs_feature_set set, u64 features)
- {
- struct btrfs_super_block *disk_super = fs_info->super_copy;
- if (set == FEAT_COMPAT)
- btrfs_set_super_compat_flags(disk_super, features);
- else if (set == FEAT_COMPAT_RO)
- btrfs_set_super_compat_ro_flags(disk_super, features);
- else
- btrfs_set_super_incompat_flags(disk_super, features);
- }
- static int can_modify_feature(struct btrfs_feature_attr *fa)
- {
- int val = 0;
- u64 set, clear;
- switch (fa->feature_set) {
- case FEAT_COMPAT:
- set = BTRFS_FEATURE_COMPAT_SAFE_SET;
- clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR;
- break;
- case FEAT_COMPAT_RO:
- set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET;
- clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR;
- break;
- case FEAT_INCOMPAT:
- set = BTRFS_FEATURE_INCOMPAT_SAFE_SET;
- clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR;
- break;
- default:
- pr_warn("btrfs: sysfs: unknown feature set %d\n",
- fa->feature_set);
- return 0;
- }
- if (set & fa->feature_bit)
- val |= 1;
- if (clear & fa->feature_bit)
- val |= 2;
- return val;
- }
- static ssize_t btrfs_feature_attr_show(struct kobject *kobj,
- struct kobj_attribute *a, char *buf)
- {
- int val = 0;
- struct btrfs_fs_info *fs_info = to_fs_info(kobj);
- struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a);
- if (fs_info) {
- u64 features = get_features(fs_info, fa->feature_set);
- if (features & fa->feature_bit)
- val = 1;
- } else
- val = can_modify_feature(fa);
- return scnprintf(buf, PAGE_SIZE, "%d\n", val);
- }
- static ssize_t btrfs_feature_attr_store(struct kobject *kobj,
- struct kobj_attribute *a,
- const char *buf, size_t count)
- {
- struct btrfs_fs_info *fs_info;
- struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a);
- u64 features, set, clear;
- unsigned long val;
- int ret;
- fs_info = to_fs_info(kobj);
- if (!fs_info)
- return -EPERM;
- if (sb_rdonly(fs_info->sb))
- return -EROFS;
- ret = kstrtoul(skip_spaces(buf), 0, &val);
- if (ret)
- return ret;
- if (fa->feature_set == FEAT_COMPAT) {
- set = BTRFS_FEATURE_COMPAT_SAFE_SET;
- clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR;
- } else if (fa->feature_set == FEAT_COMPAT_RO) {
- set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET;
- clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR;
- } else {
- set = BTRFS_FEATURE_INCOMPAT_SAFE_SET;
- clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR;
- }
- features = get_features(fs_info, fa->feature_set);
- /* Nothing to do */
- if ((val && (features & fa->feature_bit)) ||
- (!val && !(features & fa->feature_bit)))
- return count;
- if ((val && !(set & fa->feature_bit)) ||
- (!val && !(clear & fa->feature_bit))) {
- btrfs_info(fs_info,
- "%sabling feature %s on mounted fs is not supported.",
- val ? "En" : "Dis", fa->kobj_attr.attr.name);
- return -EPERM;
- }
- btrfs_info(fs_info, "%s %s feature flag",
- val ? "Setting" : "Clearing", fa->kobj_attr.attr.name);
- spin_lock(&fs_info->super_lock);
- features = get_features(fs_info, fa->feature_set);
- if (val)
- features |= fa->feature_bit;
- else
- features &= ~fa->feature_bit;
- set_features(fs_info, fa->feature_set, features);
- spin_unlock(&fs_info->super_lock);
- /*
- * We don't want to do full transaction commit from inside sysfs
- */
- btrfs_set_pending(fs_info, COMMIT);
- wake_up_process(fs_info->transaction_kthread);
- return count;
- }
- static umode_t btrfs_feature_visible(struct kobject *kobj,
- struct attribute *attr, int unused)
- {
- struct btrfs_fs_info *fs_info = to_fs_info(kobj);
- umode_t mode = attr->mode;
- if (fs_info) {
- struct btrfs_feature_attr *fa;
- u64 features;
- fa = attr_to_btrfs_feature_attr(attr);
- features = get_features(fs_info, fa->feature_set);
- if (can_modify_feature(fa))
- mode |= S_IWUSR;
- else if (!(features & fa->feature_bit))
- mode = 0;
- }
- return mode;
- }
- BTRFS_FEAT_ATTR_INCOMPAT(mixed_backref, MIXED_BACKREF);
- BTRFS_FEAT_ATTR_INCOMPAT(default_subvol, DEFAULT_SUBVOL);
- BTRFS_FEAT_ATTR_INCOMPAT(mixed_groups, MIXED_GROUPS);
- BTRFS_FEAT_ATTR_INCOMPAT(compress_lzo, COMPRESS_LZO);
- BTRFS_FEAT_ATTR_INCOMPAT(compress_zstd, COMPRESS_ZSTD);
- BTRFS_FEAT_ATTR_INCOMPAT(big_metadata, BIG_METADATA);
- BTRFS_FEAT_ATTR_INCOMPAT(extended_iref, EXTENDED_IREF);
- BTRFS_FEAT_ATTR_INCOMPAT(raid56, RAID56);
- BTRFS_FEAT_ATTR_INCOMPAT(skinny_metadata, SKINNY_METADATA);
- BTRFS_FEAT_ATTR_INCOMPAT(no_holes, NO_HOLES);
- BTRFS_FEAT_ATTR_INCOMPAT(metadata_uuid, METADATA_UUID);
- BTRFS_FEAT_ATTR_COMPAT_RO(free_space_tree, FREE_SPACE_TREE);
- BTRFS_FEAT_ATTR_INCOMPAT(raid1c34, RAID1C34);
- static struct attribute *btrfs_supported_feature_attrs[] = {
- BTRFS_FEAT_ATTR_PTR(mixed_backref),
- BTRFS_FEAT_ATTR_PTR(default_subvol),
- BTRFS_FEAT_ATTR_PTR(mixed_groups),
- BTRFS_FEAT_ATTR_PTR(compress_lzo),
- BTRFS_FEAT_ATTR_PTR(compress_zstd),
- BTRFS_FEAT_ATTR_PTR(big_metadata),
- BTRFS_FEAT_ATTR_PTR(extended_iref),
- BTRFS_FEAT_ATTR_PTR(raid56),
- BTRFS_FEAT_ATTR_PTR(skinny_metadata),
- BTRFS_FEAT_ATTR_PTR(no_holes),
- BTRFS_FEAT_ATTR_PTR(metadata_uuid),
- BTRFS_FEAT_ATTR_PTR(free_space_tree),
- BTRFS_FEAT_ATTR_PTR(raid1c34),
- NULL
- };
- /*
- * Features which depend on feature bits and may differ between each fs.
- *
- * /sys/fs/btrfs/features lists all available features of this kernel while
- * /sys/fs/btrfs/UUID/features shows features of the fs which are enabled or
- * can be changed online.
- */
- static const struct attribute_group btrfs_feature_attr_group = {
- .name = "features",
- .is_visible = btrfs_feature_visible,
- .attrs = btrfs_supported_feature_attrs,
- };
- static ssize_t rmdir_subvol_show(struct kobject *kobj,
- struct kobj_attribute *ka, char *buf)
- {
- return scnprintf(buf, PAGE_SIZE, "0\n");
- }
- BTRFS_ATTR(static_feature, rmdir_subvol, rmdir_subvol_show);
- static ssize_t supported_checksums_show(struct kobject *kobj,
- struct kobj_attribute *a, char *buf)
- {
- ssize_t ret = 0;
- int i;
- for (i = 0; i < btrfs_get_num_csums(); i++) {
- /*
- * This "trick" only works as long as 'enum btrfs_csum_type' has
- * no holes in it
- */
- ret += scnprintf(buf + ret, PAGE_SIZE - ret, "%s%s",
- (i == 0 ? "" : " "), btrfs_super_csum_name(i));
- }
- ret += scnprintf(buf + ret, PAGE_SIZE - ret, "\n");
- return ret;
- }
- BTRFS_ATTR(static_feature, supported_checksums, supported_checksums_show);
- static ssize_t send_stream_version_show(struct kobject *kobj,
- struct kobj_attribute *ka, char *buf)
- {
- return snprintf(buf, PAGE_SIZE, "%d\n", BTRFS_SEND_STREAM_VERSION);
- }
- BTRFS_ATTR(static_feature, send_stream_version, send_stream_version_show);
- static struct attribute *btrfs_supported_static_feature_attrs[] = {
- BTRFS_ATTR_PTR(static_feature, rmdir_subvol),
- BTRFS_ATTR_PTR(static_feature, supported_checksums),
- BTRFS_ATTR_PTR(static_feature, send_stream_version),
- NULL
- };
- /*
- * Features which only depend on kernel version.
- *
- * These are listed in /sys/fs/btrfs/features along with
- * btrfs_feature_attr_group
- */
- static const struct attribute_group btrfs_static_feature_attr_group = {
- .name = "features",
- .attrs = btrfs_supported_static_feature_attrs,
- };
- #ifdef CONFIG_BTRFS_DEBUG
- /*
- * Discard statistics and tunables
- */
- #define discard_to_fs_info(_kobj) to_fs_info((_kobj)->parent->parent)
- static ssize_t btrfs_discardable_bytes_show(struct kobject *kobj,
- struct kobj_attribute *a,
- char *buf)
- {
- struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
- return scnprintf(buf, PAGE_SIZE, "%lld\n",
- atomic64_read(&fs_info->discard_ctl.discardable_bytes));
- }
- BTRFS_ATTR(discard, discardable_bytes, btrfs_discardable_bytes_show);
- static ssize_t btrfs_discardable_extents_show(struct kobject *kobj,
- struct kobj_attribute *a,
- char *buf)
- {
- struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
- return scnprintf(buf, PAGE_SIZE, "%d\n",
- atomic_read(&fs_info->discard_ctl.discardable_extents));
- }
- BTRFS_ATTR(discard, discardable_extents, btrfs_discardable_extents_show);
- static ssize_t btrfs_discard_bitmap_bytes_show(struct kobject *kobj,
- struct kobj_attribute *a,
- char *buf)
- {
- struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
- return scnprintf(buf, PAGE_SIZE, "%llu\n",
- fs_info->discard_ctl.discard_bitmap_bytes);
- }
- BTRFS_ATTR(discard, discard_bitmap_bytes, btrfs_discard_bitmap_bytes_show);
- static ssize_t btrfs_discard_bytes_saved_show(struct kobject *kobj,
- struct kobj_attribute *a,
- char *buf)
- {
- struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
- return scnprintf(buf, PAGE_SIZE, "%lld\n",
- atomic64_read(&fs_info->discard_ctl.discard_bytes_saved));
- }
- BTRFS_ATTR(discard, discard_bytes_saved, btrfs_discard_bytes_saved_show);
- static ssize_t btrfs_discard_extent_bytes_show(struct kobject *kobj,
- struct kobj_attribute *a,
- char *buf)
- {
- struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
- return scnprintf(buf, PAGE_SIZE, "%llu\n",
- fs_info->discard_ctl.discard_extent_bytes);
- }
- BTRFS_ATTR(discard, discard_extent_bytes, btrfs_discard_extent_bytes_show);
- static ssize_t btrfs_discard_iops_limit_show(struct kobject *kobj,
- struct kobj_attribute *a,
- char *buf)
- {
- struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
- return scnprintf(buf, PAGE_SIZE, "%u\n",
- READ_ONCE(fs_info->discard_ctl.iops_limit));
- }
- static ssize_t btrfs_discard_iops_limit_store(struct kobject *kobj,
- struct kobj_attribute *a,
- const char *buf, size_t len)
- {
- struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
- struct btrfs_discard_ctl *discard_ctl = &fs_info->discard_ctl;
- u32 iops_limit;
- int ret;
- ret = kstrtou32(buf, 10, &iops_limit);
- if (ret)
- return -EINVAL;
- WRITE_ONCE(discard_ctl->iops_limit, iops_limit);
- return len;
- }
- BTRFS_ATTR_RW(discard, iops_limit, btrfs_discard_iops_limit_show,
- btrfs_discard_iops_limit_store);
- static ssize_t btrfs_discard_kbps_limit_show(struct kobject *kobj,
- struct kobj_attribute *a,
- char *buf)
- {
- struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
- return scnprintf(buf, PAGE_SIZE, "%u\n",
- READ_ONCE(fs_info->discard_ctl.kbps_limit));
- }
- static ssize_t btrfs_discard_kbps_limit_store(struct kobject *kobj,
- struct kobj_attribute *a,
- const char *buf, size_t len)
- {
- struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
- struct btrfs_discard_ctl *discard_ctl = &fs_info->discard_ctl;
- u32 kbps_limit;
- int ret;
- ret = kstrtou32(buf, 10, &kbps_limit);
- if (ret)
- return -EINVAL;
- WRITE_ONCE(discard_ctl->kbps_limit, kbps_limit);
- return len;
- }
- BTRFS_ATTR_RW(discard, kbps_limit, btrfs_discard_kbps_limit_show,
- btrfs_discard_kbps_limit_store);
- static ssize_t btrfs_discard_max_discard_size_show(struct kobject *kobj,
- struct kobj_attribute *a,
- char *buf)
- {
- struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
- return scnprintf(buf, PAGE_SIZE, "%llu\n",
- READ_ONCE(fs_info->discard_ctl.max_discard_size));
- }
- static ssize_t btrfs_discard_max_discard_size_store(struct kobject *kobj,
- struct kobj_attribute *a,
- const char *buf, size_t len)
- {
- struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
- struct btrfs_discard_ctl *discard_ctl = &fs_info->discard_ctl;
- u64 max_discard_size;
- int ret;
- ret = kstrtou64(buf, 10, &max_discard_size);
- if (ret)
- return -EINVAL;
- WRITE_ONCE(discard_ctl->max_discard_size, max_discard_size);
- return len;
- }
- BTRFS_ATTR_RW(discard, max_discard_size, btrfs_discard_max_discard_size_show,
- btrfs_discard_max_discard_size_store);
- static const struct attribute *discard_debug_attrs[] = {
- BTRFS_ATTR_PTR(discard, discardable_bytes),
- BTRFS_ATTR_PTR(discard, discardable_extents),
- BTRFS_ATTR_PTR(discard, discard_bitmap_bytes),
- BTRFS_ATTR_PTR(discard, discard_bytes_saved),
- BTRFS_ATTR_PTR(discard, discard_extent_bytes),
- BTRFS_ATTR_PTR(discard, iops_limit),
- BTRFS_ATTR_PTR(discard, kbps_limit),
- BTRFS_ATTR_PTR(discard, max_discard_size),
- NULL,
- };
- /*
- * Runtime debugging exported via sysfs
- *
- * /sys/fs/btrfs/debug - applies to module or all filesystems
- * /sys/fs/btrfs/UUID - applies only to the given filesystem
- */
- static const struct attribute *btrfs_debug_mount_attrs[] = {
- NULL,
- };
- static struct attribute *btrfs_debug_feature_attrs[] = {
- NULL
- };
- static const struct attribute_group btrfs_debug_feature_attr_group = {
- .name = "debug",
- .attrs = btrfs_debug_feature_attrs,
- };
- #endif
- static ssize_t btrfs_show_u64(u64 *value_ptr, spinlock_t *lock, char *buf)
- {
- u64 val;
- if (lock)
- spin_lock(lock);
- val = *value_ptr;
- if (lock)
- spin_unlock(lock);
- return scnprintf(buf, PAGE_SIZE, "%llu\n", val);
- }
- static ssize_t global_rsv_size_show(struct kobject *kobj,
- struct kobj_attribute *ka, char *buf)
- {
- struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent);
- struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;
- return btrfs_show_u64(&block_rsv->size, &block_rsv->lock, buf);
- }
- BTRFS_ATTR(allocation, global_rsv_size, global_rsv_size_show);
- static ssize_t global_rsv_reserved_show(struct kobject *kobj,
- struct kobj_attribute *a, char *buf)
- {
- struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent);
- struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;
- return btrfs_show_u64(&block_rsv->reserved, &block_rsv->lock, buf);
- }
- BTRFS_ATTR(allocation, global_rsv_reserved, global_rsv_reserved_show);
- #define to_space_info(_kobj) container_of(_kobj, struct btrfs_space_info, kobj)
- #define to_raid_kobj(_kobj) container_of(_kobj, struct raid_kobject, kobj)
- static ssize_t raid_bytes_show(struct kobject *kobj,
- struct kobj_attribute *attr, char *buf);
- BTRFS_ATTR(raid, total_bytes, raid_bytes_show);
- BTRFS_ATTR(raid, used_bytes, raid_bytes_show);
- static ssize_t raid_bytes_show(struct kobject *kobj,
- struct kobj_attribute *attr, char *buf)
- {
- struct btrfs_space_info *sinfo = to_space_info(kobj->parent);
- struct btrfs_block_group *block_group;
- int index = btrfs_bg_flags_to_raid_index(to_raid_kobj(kobj)->flags);
- u64 val = 0;
- down_read(&sinfo->groups_sem);
- list_for_each_entry(block_group, &sinfo->block_groups[index], list) {
- if (&attr->attr == BTRFS_ATTR_PTR(raid, total_bytes))
- val += block_group->length;
- else
- val += block_group->used;
- }
- up_read(&sinfo->groups_sem);
- return scnprintf(buf, PAGE_SIZE, "%llu\n", val);
- }
- static struct attribute *raid_attrs[] = {
- BTRFS_ATTR_PTR(raid, total_bytes),
- BTRFS_ATTR_PTR(raid, used_bytes),
- NULL
- };
- ATTRIBUTE_GROUPS(raid);
- static void release_raid_kobj(struct kobject *kobj)
- {
- kfree(to_raid_kobj(kobj));
- }
- static struct kobj_type btrfs_raid_ktype = {
- .sysfs_ops = &kobj_sysfs_ops,
- .release = release_raid_kobj,
- .default_groups = raid_groups,
- };
- #define SPACE_INFO_ATTR(field) \
- static ssize_t btrfs_space_info_show_##field(struct kobject *kobj, \
- struct kobj_attribute *a, \
- char *buf) \
- { \
- struct btrfs_space_info *sinfo = to_space_info(kobj); \
- return btrfs_show_u64(&sinfo->field, &sinfo->lock, buf); \
- } \
- BTRFS_ATTR(space_info, field, btrfs_space_info_show_##field)
- static ssize_t btrfs_space_info_show_total_bytes_pinned(struct kobject *kobj,
- struct kobj_attribute *a,
- char *buf)
- {
- struct btrfs_space_info *sinfo = to_space_info(kobj);
- s64 val = percpu_counter_sum(&sinfo->total_bytes_pinned);
- return scnprintf(buf, PAGE_SIZE, "%lld\n", val);
- }
- SPACE_INFO_ATTR(flags);
- SPACE_INFO_ATTR(total_bytes);
- SPACE_INFO_ATTR(bytes_used);
- SPACE_INFO_ATTR(bytes_pinned);
- SPACE_INFO_ATTR(bytes_reserved);
- SPACE_INFO_ATTR(bytes_may_use);
- SPACE_INFO_ATTR(bytes_readonly);
- SPACE_INFO_ATTR(disk_used);
- SPACE_INFO_ATTR(disk_total);
- BTRFS_ATTR(space_info, total_bytes_pinned,
- btrfs_space_info_show_total_bytes_pinned);
- static struct attribute *space_info_attrs[] = {
- BTRFS_ATTR_PTR(space_info, flags),
- BTRFS_ATTR_PTR(space_info, total_bytes),
- BTRFS_ATTR_PTR(space_info, bytes_used),
- BTRFS_ATTR_PTR(space_info, bytes_pinned),
- BTRFS_ATTR_PTR(space_info, bytes_reserved),
- BTRFS_ATTR_PTR(space_info, bytes_may_use),
- BTRFS_ATTR_PTR(space_info, bytes_readonly),
- BTRFS_ATTR_PTR(space_info, disk_used),
- BTRFS_ATTR_PTR(space_info, disk_total),
- BTRFS_ATTR_PTR(space_info, total_bytes_pinned),
- NULL,
- };
- ATTRIBUTE_GROUPS(space_info);
- static void space_info_release(struct kobject *kobj)
- {
- struct btrfs_space_info *sinfo = to_space_info(kobj);
- percpu_counter_destroy(&sinfo->total_bytes_pinned);
- kfree(sinfo);
- }
- static struct kobj_type space_info_ktype = {
- .sysfs_ops = &kobj_sysfs_ops,
- .release = space_info_release,
- .default_groups = space_info_groups,
- };
- static const struct attribute *allocation_attrs[] = {
- BTRFS_ATTR_PTR(allocation, global_rsv_reserved),
- BTRFS_ATTR_PTR(allocation, global_rsv_size),
- NULL,
- };
- static ssize_t btrfs_label_show(struct kobject *kobj,
- struct kobj_attribute *a, char *buf)
- {
- struct btrfs_fs_info *fs_info = to_fs_info(kobj);
- char *label = fs_info->super_copy->label;
- ssize_t ret;
- spin_lock(&fs_info->super_lock);
- ret = scnprintf(buf, PAGE_SIZE, label[0] ? "%s\n" : "%s", label);
- spin_unlock(&fs_info->super_lock);
- return ret;
- }
- static ssize_t btrfs_label_store(struct kobject *kobj,
- struct kobj_attribute *a,
- const char *buf, size_t len)
- {
- struct btrfs_fs_info *fs_info = to_fs_info(kobj);
- size_t p_len;
- if (!fs_info)
- return -EPERM;
- if (sb_rdonly(fs_info->sb))
- return -EROFS;
- /*
- * p_len is the len until the first occurrence of either
- * '\n' or '\0'
- */
- p_len = strcspn(buf, "\n");
- if (p_len >= BTRFS_LABEL_SIZE)
- return -EINVAL;
- spin_lock(&fs_info->super_lock);
- memset(fs_info->super_copy->label, 0, BTRFS_LABEL_SIZE);
- memcpy(fs_info->super_copy->label, buf, p_len);
- spin_unlock(&fs_info->super_lock);
- /*
- * We don't want to do full transaction commit from inside sysfs
- */
- btrfs_set_pending(fs_info, COMMIT);
- wake_up_process(fs_info->transaction_kthread);
- return len;
- }
- BTRFS_ATTR_RW(, label, btrfs_label_show, btrfs_label_store);
- static ssize_t btrfs_nodesize_show(struct kobject *kobj,
- struct kobj_attribute *a, char *buf)
- {
- struct btrfs_fs_info *fs_info = to_fs_info(kobj);
- return scnprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->nodesize);
- }
- BTRFS_ATTR(, nodesize, btrfs_nodesize_show);
- static ssize_t btrfs_sectorsize_show(struct kobject *kobj,
- struct kobj_attribute *a, char *buf)
- {
- struct btrfs_fs_info *fs_info = to_fs_info(kobj);
- return scnprintf(buf, PAGE_SIZE, "%u\n",
- fs_info->super_copy->sectorsize);
- }
- BTRFS_ATTR(, sectorsize, btrfs_sectorsize_show);
- static ssize_t btrfs_clone_alignment_show(struct kobject *kobj,
- struct kobj_attribute *a, char *buf)
- {
- struct btrfs_fs_info *fs_info = to_fs_info(kobj);
- return scnprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->sectorsize);
- }
- BTRFS_ATTR(, clone_alignment, btrfs_clone_alignment_show);
- static ssize_t quota_override_show(struct kobject *kobj,
- struct kobj_attribute *a, char *buf)
- {
- struct btrfs_fs_info *fs_info = to_fs_info(kobj);
- int quota_override;
- quota_override = test_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags);
- return scnprintf(buf, PAGE_SIZE, "%d\n", quota_override);
- }
- static ssize_t quota_override_store(struct kobject *kobj,
- struct kobj_attribute *a,
- const char *buf, size_t len)
- {
- struct btrfs_fs_info *fs_info = to_fs_info(kobj);
- unsigned long knob;
- int err;
- if (!fs_info)
- return -EPERM;
- if (!capable(CAP_SYS_RESOURCE))
- return -EPERM;
- err = kstrtoul(buf, 10, &knob);
- if (err)
- return err;
- if (knob > 1)
- return -EINVAL;
- if (knob)
- set_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags);
- else
- clear_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags);
- return len;
- }
- BTRFS_ATTR_RW(, quota_override, quota_override_show, quota_override_store);
- static ssize_t btrfs_metadata_uuid_show(struct kobject *kobj,
- struct kobj_attribute *a, char *buf)
- {
- struct btrfs_fs_info *fs_info = to_fs_info(kobj);
- return scnprintf(buf, PAGE_SIZE, "%pU\n",
- fs_info->fs_devices->metadata_uuid);
- }
- BTRFS_ATTR(, metadata_uuid, btrfs_metadata_uuid_show);
- static ssize_t btrfs_checksum_show(struct kobject *kobj,
- struct kobj_attribute *a, char *buf)
- {
- struct btrfs_fs_info *fs_info = to_fs_info(kobj);
- u16 csum_type = btrfs_super_csum_type(fs_info->super_copy);
- return scnprintf(buf, PAGE_SIZE, "%s (%s)\n",
- btrfs_super_csum_name(csum_type),
- crypto_shash_driver_name(fs_info->csum_shash));
- }
- BTRFS_ATTR(, checksum, btrfs_checksum_show);
- static ssize_t btrfs_exclusive_operation_show(struct kobject *kobj,
- struct kobj_attribute *a, char *buf)
- {
- struct btrfs_fs_info *fs_info = to_fs_info(kobj);
- const char *str;
- switch (READ_ONCE(fs_info->exclusive_operation)) {
- case BTRFS_EXCLOP_NONE:
- str = "none\n";
- break;
- case BTRFS_EXCLOP_BALANCE:
- str = "balance\n";
- break;
- case BTRFS_EXCLOP_DEV_ADD:
- str = "device add\n";
- break;
- case BTRFS_EXCLOP_DEV_REMOVE:
- str = "device remove\n";
- break;
- case BTRFS_EXCLOP_DEV_REPLACE:
- str = "device replace\n";
- break;
- case BTRFS_EXCLOP_RESIZE:
- str = "resize\n";
- break;
- case BTRFS_EXCLOP_SWAP_ACTIVATE:
- str = "swap activate\n";
- break;
- default:
- str = "UNKNOWN\n";
- break;
- }
- return scnprintf(buf, PAGE_SIZE, "%s", str);
- }
- BTRFS_ATTR(, exclusive_operation, btrfs_exclusive_operation_show);
- static const struct attribute *btrfs_attrs[] = {
- BTRFS_ATTR_PTR(, label),
- BTRFS_ATTR_PTR(, nodesize),
- BTRFS_ATTR_PTR(, sectorsize),
- BTRFS_ATTR_PTR(, clone_alignment),
- BTRFS_ATTR_PTR(, quota_override),
- BTRFS_ATTR_PTR(, metadata_uuid),
- BTRFS_ATTR_PTR(, checksum),
- BTRFS_ATTR_PTR(, exclusive_operation),
- NULL,
- };
- static void btrfs_release_fsid_kobj(struct kobject *kobj)
- {
- struct btrfs_fs_devices *fs_devs = to_fs_devs(kobj);
- memset(&fs_devs->fsid_kobj, 0, sizeof(struct kobject));
- complete(&fs_devs->kobj_unregister);
- }
- static struct kobj_type btrfs_ktype = {
- .sysfs_ops = &kobj_sysfs_ops,
- .release = btrfs_release_fsid_kobj,
- };
- static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj)
- {
- if (kobj->ktype != &btrfs_ktype)
- return NULL;
- return container_of(kobj, struct btrfs_fs_devices, fsid_kobj);
- }
- static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj)
- {
- if (kobj->ktype != &btrfs_ktype)
- return NULL;
- return to_fs_devs(kobj)->fs_info;
- }
- #define NUM_FEATURE_BITS 64
- #define BTRFS_FEATURE_NAME_MAX 13
- static char btrfs_unknown_feature_names[FEAT_MAX][NUM_FEATURE_BITS][BTRFS_FEATURE_NAME_MAX];
- static struct btrfs_feature_attr btrfs_feature_attrs[FEAT_MAX][NUM_FEATURE_BITS];
- static const u64 supported_feature_masks[FEAT_MAX] = {
- [FEAT_COMPAT] = BTRFS_FEATURE_COMPAT_SUPP,
- [FEAT_COMPAT_RO] = BTRFS_FEATURE_COMPAT_RO_SUPP,
- [FEAT_INCOMPAT] = BTRFS_FEATURE_INCOMPAT_SUPP,
- };
- static int addrm_unknown_feature_attrs(struct btrfs_fs_info *fs_info, bool add)
- {
- int set;
- for (set = 0; set < FEAT_MAX; set++) {
- int i;
- struct attribute *attrs[2];
- struct attribute_group agroup = {
- .name = "features",
- .attrs = attrs,
- };
- u64 features = get_features(fs_info, set);
- features &= ~supported_feature_masks[set];
- if (!features)
- continue;
- attrs[1] = NULL;
- for (i = 0; i < NUM_FEATURE_BITS; i++) {
- struct btrfs_feature_attr *fa;
- if (!(features & (1ULL << i)))
- continue;
- fa = &btrfs_feature_attrs[set][i];
- attrs[0] = &fa->kobj_attr.attr;
- if (add) {
- int ret;
- ret = sysfs_merge_group(&fs_info->fs_devices->fsid_kobj,
- &agroup);
- if (ret)
- return ret;
- } else
- sysfs_unmerge_group(&fs_info->fs_devices->fsid_kobj,
- &agroup);
- }
- }
- return 0;
- }
- static void __btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs)
- {
- if (fs_devs->devinfo_kobj) {
- kobject_del(fs_devs->devinfo_kobj);
- kobject_put(fs_devs->devinfo_kobj);
- fs_devs->devinfo_kobj = NULL;
- }
- if (fs_devs->devices_kobj) {
- kobject_del(fs_devs->devices_kobj);
- kobject_put(fs_devs->devices_kobj);
- fs_devs->devices_kobj = NULL;
- }
- if (fs_devs->fsid_kobj.state_initialized) {
- kobject_del(&fs_devs->fsid_kobj);
- kobject_put(&fs_devs->fsid_kobj);
- wait_for_completion(&fs_devs->kobj_unregister);
- }
- }
- /* when fs_devs is NULL it will remove all fsid kobject */
- void btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs)
- {
- struct list_head *fs_uuids = btrfs_get_fs_uuids();
- if (fs_devs) {
- __btrfs_sysfs_remove_fsid(fs_devs);
- return;
- }
- list_for_each_entry(fs_devs, fs_uuids, fs_list) {
- __btrfs_sysfs_remove_fsid(fs_devs);
- }
- }
- static void btrfs_sysfs_remove_fs_devices(struct btrfs_fs_devices *fs_devices)
- {
- struct btrfs_device *device;
- struct btrfs_fs_devices *seed;
- list_for_each_entry(device, &fs_devices->devices, dev_list)
- btrfs_sysfs_remove_device(device);
- list_for_each_entry(seed, &fs_devices->seed_list, seed_list) {
- list_for_each_entry(device, &seed->devices, dev_list)
- btrfs_sysfs_remove_device(device);
- }
- }
- void btrfs_sysfs_remove_mounted(struct btrfs_fs_info *fs_info)
- {
- struct kobject *fsid_kobj = &fs_info->fs_devices->fsid_kobj;
- sysfs_remove_link(fsid_kobj, "bdi");
- if (fs_info->space_info_kobj) {
- sysfs_remove_files(fs_info->space_info_kobj, allocation_attrs);
- kobject_del(fs_info->space_info_kobj);
- kobject_put(fs_info->space_info_kobj);
- }
- #ifdef CONFIG_BTRFS_DEBUG
- if (fs_info->discard_debug_kobj) {
- sysfs_remove_files(fs_info->discard_debug_kobj,
- discard_debug_attrs);
- kobject_del(fs_info->discard_debug_kobj);
- kobject_put(fs_info->discard_debug_kobj);
- }
- if (fs_info->debug_kobj) {
- sysfs_remove_files(fs_info->debug_kobj, btrfs_debug_mount_attrs);
- kobject_del(fs_info->debug_kobj);
- kobject_put(fs_info->debug_kobj);
- }
- #endif
- addrm_unknown_feature_attrs(fs_info, false);
- sysfs_remove_group(fsid_kobj, &btrfs_feature_attr_group);
- sysfs_remove_files(fsid_kobj, btrfs_attrs);
- btrfs_sysfs_remove_fs_devices(fs_info->fs_devices);
- }
- static const char * const btrfs_feature_set_names[FEAT_MAX] = {
- [FEAT_COMPAT] = "compat",
- [FEAT_COMPAT_RO] = "compat_ro",
- [FEAT_INCOMPAT] = "incompat",
- };
- const char *btrfs_feature_set_name(enum btrfs_feature_set set)
- {
- return btrfs_feature_set_names[set];
- }
- char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags)
- {
- size_t bufsize = 4096; /* safe max, 64 names * 64 bytes */
- int len = 0;
- int i;
- char *str;
- str = kmalloc(bufsize, GFP_KERNEL);
- if (!str)
- return str;
- for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) {
- const char *name;
- if (!(flags & (1ULL << i)))
- continue;
- name = btrfs_feature_attrs[set][i].kobj_attr.attr.name;
- len += scnprintf(str + len, bufsize - len, "%s%s",
- len ? "," : "", name);
- }
- return str;
- }
- static void init_feature_attrs(void)
- {
- struct btrfs_feature_attr *fa;
- int set, i;
- BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names) !=
- ARRAY_SIZE(btrfs_feature_attrs));
- BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names[0]) !=
- ARRAY_SIZE(btrfs_feature_attrs[0]));
- memset(btrfs_feature_attrs, 0, sizeof(btrfs_feature_attrs));
- memset(btrfs_unknown_feature_names, 0,
- sizeof(btrfs_unknown_feature_names));
- for (i = 0; btrfs_supported_feature_attrs[i]; i++) {
- struct btrfs_feature_attr *sfa;
- struct attribute *a = btrfs_supported_feature_attrs[i];
- int bit;
- sfa = attr_to_btrfs_feature_attr(a);
- bit = ilog2(sfa->feature_bit);
- fa = &btrfs_feature_attrs[sfa->feature_set][bit];
- fa->kobj_attr.attr.name = sfa->kobj_attr.attr.name;
- }
- for (set = 0; set < FEAT_MAX; set++) {
- for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) {
- char *name = btrfs_unknown_feature_names[set][i];
- fa = &btrfs_feature_attrs[set][i];
- if (fa->kobj_attr.attr.name)
- continue;
- snprintf(name, BTRFS_FEATURE_NAME_MAX, "%s:%u",
- btrfs_feature_set_names[set], i);
- fa->kobj_attr.attr.name = name;
- fa->kobj_attr.attr.mode = S_IRUGO;
- fa->feature_set = set;
- fa->feature_bit = 1ULL << i;
- }
- }
- }
- /*
- * Create a sysfs entry for a given block group type at path
- * /sys/fs/btrfs/UUID/allocation/data/TYPE
- */
- void btrfs_sysfs_add_block_group_type(struct btrfs_block_group *cache)
- {
- struct btrfs_fs_info *fs_info = cache->fs_info;
- struct btrfs_space_info *space_info = cache->space_info;
- struct raid_kobject *rkobj;
- const int index = btrfs_bg_flags_to_raid_index(cache->flags);
- unsigned int nofs_flag;
- int ret;
- /*
- * Setup a NOFS context because kobject_add(), deep in its call chain,
- * does GFP_KERNEL allocations, and we are often called in a context
- * where if reclaim is triggered we can deadlock (we are either holding
- * a transaction handle or some lock required for a transaction
- * commit).
- */
- nofs_flag = memalloc_nofs_save();
- rkobj = kzalloc(sizeof(*rkobj), GFP_NOFS);
- if (!rkobj) {
- memalloc_nofs_restore(nofs_flag);
- btrfs_warn(cache->fs_info,
- "couldn't alloc memory for raid level kobject");
- return;
- }
- rkobj->flags = cache->flags;
- kobject_init(&rkobj->kobj, &btrfs_raid_ktype);
- /*
- * We call this either on mount, or if we've created a block group for a
- * new index type while running (i.e. when restriping). The running
- * case is tricky because we could race with other threads, so we need
- * to have this check to make sure we didn't already init the kobject.
- *
- * We don't have to protect on the free side because it only happens on
- * unmount.
- */
- spin_lock(&space_info->lock);
- if (space_info->block_group_kobjs[index]) {
- spin_unlock(&space_info->lock);
- kobject_put(&rkobj->kobj);
- return;
- } else {
- space_info->block_group_kobjs[index] = &rkobj->kobj;
- }
- spin_unlock(&space_info->lock);
- ret = kobject_add(&rkobj->kobj, &space_info->kobj, "%s",
- btrfs_bg_type_to_raid_name(rkobj->flags));
- memalloc_nofs_restore(nofs_flag);
- if (ret) {
- spin_lock(&space_info->lock);
- space_info->block_group_kobjs[index] = NULL;
- spin_unlock(&space_info->lock);
- kobject_put(&rkobj->kobj);
- btrfs_warn(fs_info,
- "failed to add kobject for block cache, ignoring");
- return;
- }
- }
- /*
- * Remove sysfs directories for all block group types of a given space info and
- * the space info as well
- */
- void btrfs_sysfs_remove_space_info(struct btrfs_space_info *space_info)
- {
- int i;
- for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) {
- struct kobject *kobj;
- kobj = space_info->block_group_kobjs[i];
- space_info->block_group_kobjs[i] = NULL;
- if (kobj) {
- kobject_del(kobj);
- kobject_put(kobj);
- }
- }
- kobject_del(&space_info->kobj);
- kobject_put(&space_info->kobj);
- }
- static const char *alloc_name(u64 flags)
- {
- switch (flags) {
- case BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_DATA:
- return "mixed";
- case BTRFS_BLOCK_GROUP_METADATA:
- return "metadata";
- case BTRFS_BLOCK_GROUP_DATA:
- return "data";
- case BTRFS_BLOCK_GROUP_SYSTEM:
- return "system";
- default:
- WARN_ON(1);
- return "invalid-combination";
- };
- }
- /*
- * Create a sysfs entry for a space info type at path
- * /sys/fs/btrfs/UUID/allocation/TYPE
- */
- int btrfs_sysfs_add_space_info_type(struct btrfs_fs_info *fs_info,
- struct btrfs_space_info *space_info)
- {
- int ret;
- ret = kobject_init_and_add(&space_info->kobj, &space_info_ktype,
- fs_info->space_info_kobj, "%s",
- alloc_name(space_info->flags));
- if (ret) {
- kobject_put(&space_info->kobj);
- return ret;
- }
- return 0;
- }
- void btrfs_sysfs_remove_device(struct btrfs_device *device)
- {
- struct hd_struct *disk;
- struct kobject *disk_kobj;
- struct kobject *devices_kobj;
- /*
- * Seed fs_devices devices_kobj aren't used, fetch kobject from the
- * fs_info::fs_devices.
- */
- devices_kobj = device->fs_info->fs_devices->devices_kobj;
- ASSERT(devices_kobj);
- if (device->bdev) {
- disk = device->bdev->bd_part;
- disk_kobj = &part_to_dev(disk)->kobj;
- sysfs_remove_link(devices_kobj, disk_kobj->name);
- }
- if (device->devid_kobj.state_initialized) {
- kobject_del(&device->devid_kobj);
- kobject_put(&device->devid_kobj);
- wait_for_completion(&device->kobj_unregister);
- }
- }
- static ssize_t btrfs_devinfo_in_fs_metadata_show(struct kobject *kobj,
- struct kobj_attribute *a,
- char *buf)
- {
- int val;
- struct btrfs_device *device = container_of(kobj, struct btrfs_device,
- devid_kobj);
- val = !!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &device->dev_state);
- return scnprintf(buf, PAGE_SIZE, "%d\n", val);
- }
- BTRFS_ATTR(devid, in_fs_metadata, btrfs_devinfo_in_fs_metadata_show);
- static ssize_t btrfs_devinfo_missing_show(struct kobject *kobj,
- struct kobj_attribute *a, char *buf)
- {
- int val;
- struct btrfs_device *device = container_of(kobj, struct btrfs_device,
- devid_kobj);
- val = !!test_bit(BTRFS_DEV_STATE_MISSING, &device->dev_state);
- return scnprintf(buf, PAGE_SIZE, "%d\n", val);
- }
- BTRFS_ATTR(devid, missing, btrfs_devinfo_missing_show);
- static ssize_t btrfs_devinfo_replace_target_show(struct kobject *kobj,
- struct kobj_attribute *a,
- char *buf)
- {
- int val;
- struct btrfs_device *device = container_of(kobj, struct btrfs_device,
- devid_kobj);
- val = !!test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state);
- return scnprintf(buf, PAGE_SIZE, "%d\n", val);
- }
- BTRFS_ATTR(devid, replace_target, btrfs_devinfo_replace_target_show);
- static ssize_t btrfs_devinfo_writeable_show(struct kobject *kobj,
- struct kobj_attribute *a, char *buf)
- {
- int val;
- struct btrfs_device *device = container_of(kobj, struct btrfs_device,
- devid_kobj);
- val = !!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state);
- return scnprintf(buf, PAGE_SIZE, "%d\n", val);
- }
- BTRFS_ATTR(devid, writeable, btrfs_devinfo_writeable_show);
- static struct attribute *devid_attrs[] = {
- BTRFS_ATTR_PTR(devid, in_fs_metadata),
- BTRFS_ATTR_PTR(devid, missing),
- BTRFS_ATTR_PTR(devid, replace_target),
- BTRFS_ATTR_PTR(devid, writeable),
- NULL
- };
- ATTRIBUTE_GROUPS(devid);
- static void btrfs_release_devid_kobj(struct kobject *kobj)
- {
- struct btrfs_device *device = container_of(kobj, struct btrfs_device,
- devid_kobj);
- memset(&device->devid_kobj, 0, sizeof(struct kobject));
- complete(&device->kobj_unregister);
- }
- static struct kobj_type devid_ktype = {
- .sysfs_ops = &kobj_sysfs_ops,
- .default_groups = devid_groups,
- .release = btrfs_release_devid_kobj,
- };
- int btrfs_sysfs_add_device(struct btrfs_device *device)
- {
- int ret;
- unsigned int nofs_flag;
- struct kobject *devices_kobj;
- struct kobject *devinfo_kobj;
- /*
- * Make sure we use the fs_info::fs_devices to fetch the kobjects even
- * for the seed fs_devices
- */
- devices_kobj = device->fs_info->fs_devices->devices_kobj;
- devinfo_kobj = device->fs_info->fs_devices->devinfo_kobj;
- ASSERT(devices_kobj);
- ASSERT(devinfo_kobj);
- nofs_flag = memalloc_nofs_save();
- if (device->bdev) {
- struct hd_struct *disk;
- struct kobject *disk_kobj;
- disk = device->bdev->bd_part;
- disk_kobj = &part_to_dev(disk)->kobj;
- ret = sysfs_create_link(devices_kobj, disk_kobj, disk_kobj->name);
- if (ret) {
- btrfs_warn(device->fs_info,
- "creating sysfs device link for devid %llu failed: %d",
- device->devid, ret);
- goto out;
- }
- }
- init_completion(&device->kobj_unregister);
- ret = kobject_init_and_add(&device->devid_kobj, &devid_ktype,
- devinfo_kobj, "%llu", device->devid);
- if (ret) {
- kobject_put(&device->devid_kobj);
- btrfs_warn(device->fs_info,
- "devinfo init for devid %llu failed: %d",
- device->devid, ret);
- }
- out:
- memalloc_nofs_restore(nofs_flag);
- return ret;
- }
- static int btrfs_sysfs_add_fs_devices(struct btrfs_fs_devices *fs_devices)
- {
- int ret;
- struct btrfs_device *device;
- struct btrfs_fs_devices *seed;
- list_for_each_entry(device, &fs_devices->devices, dev_list) {
- ret = btrfs_sysfs_add_device(device);
- if (ret)
- goto fail;
- }
- list_for_each_entry(seed, &fs_devices->seed_list, seed_list) {
- list_for_each_entry(device, &seed->devices, dev_list) {
- ret = btrfs_sysfs_add_device(device);
- if (ret)
- goto fail;
- }
- }
- return 0;
- fail:
- btrfs_sysfs_remove_fs_devices(fs_devices);
- return ret;
- }
- void btrfs_kobject_uevent(struct block_device *bdev, enum kobject_action action)
- {
- int ret;
- ret = kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, action);
- if (ret)
- pr_warn("BTRFS: Sending event '%d' to kobject: '%s' (%p): failed\n",
- action, kobject_name(&disk_to_dev(bdev->bd_disk)->kobj),
- &disk_to_dev(bdev->bd_disk)->kobj);
- }
- void btrfs_sysfs_update_sprout_fsid(struct btrfs_fs_devices *fs_devices)
- {
- char fsid_buf[BTRFS_UUID_UNPARSED_SIZE];
- /*
- * Sprouting changes fsid of the mounted filesystem, rename the fsid
- * directory
- */
- snprintf(fsid_buf, BTRFS_UUID_UNPARSED_SIZE, "%pU", fs_devices->fsid);
- if (kobject_rename(&fs_devices->fsid_kobj, fsid_buf))
- btrfs_warn(fs_devices->fs_info,
- "sysfs: failed to create fsid for sprout");
- }
- void btrfs_sysfs_update_devid(struct btrfs_device *device)
- {
- char tmp[24];
- snprintf(tmp, sizeof(tmp), "%llu", device->devid);
- if (kobject_rename(&device->devid_kobj, tmp))
- btrfs_warn(device->fs_devices->fs_info,
- "sysfs: failed to update devid for %llu",
- device->devid);
- }
- /* /sys/fs/btrfs/ entry */
- static struct kset *btrfs_kset;
- /*
- * Creates:
- * /sys/fs/btrfs/UUID
- *
- * Can be called by the device discovery thread.
- */
- int btrfs_sysfs_add_fsid(struct btrfs_fs_devices *fs_devs)
- {
- int error;
- init_completion(&fs_devs->kobj_unregister);
- fs_devs->fsid_kobj.kset = btrfs_kset;
- error = kobject_init_and_add(&fs_devs->fsid_kobj, &btrfs_ktype, NULL,
- "%pU", fs_devs->fsid);
- if (error) {
- kobject_put(&fs_devs->fsid_kobj);
- return error;
- }
- fs_devs->devices_kobj = kobject_create_and_add("devices",
- &fs_devs->fsid_kobj);
- if (!fs_devs->devices_kobj) {
- btrfs_err(fs_devs->fs_info,
- "failed to init sysfs device interface");
- btrfs_sysfs_remove_fsid(fs_devs);
- return -ENOMEM;
- }
- fs_devs->devinfo_kobj = kobject_create_and_add("devinfo",
- &fs_devs->fsid_kobj);
- if (!fs_devs->devinfo_kobj) {
- btrfs_err(fs_devs->fs_info,
- "failed to init sysfs devinfo kobject");
- btrfs_sysfs_remove_fsid(fs_devs);
- return -ENOMEM;
- }
- return 0;
- }
- int btrfs_sysfs_add_mounted(struct btrfs_fs_info *fs_info)
- {
- int error;
- struct btrfs_fs_devices *fs_devs = fs_info->fs_devices;
- struct kobject *fsid_kobj = &fs_devs->fsid_kobj;
- error = btrfs_sysfs_add_fs_devices(fs_devs);
- if (error)
- return error;
- error = sysfs_create_files(fsid_kobj, btrfs_attrs);
- if (error) {
- btrfs_sysfs_remove_fs_devices(fs_devs);
- return error;
- }
- error = sysfs_create_group(fsid_kobj,
- &btrfs_feature_attr_group);
- if (error)
- goto failure;
- #ifdef CONFIG_BTRFS_DEBUG
- fs_info->debug_kobj = kobject_create_and_add("debug", fsid_kobj);
- if (!fs_info->debug_kobj) {
- error = -ENOMEM;
- goto failure;
- }
- error = sysfs_create_files(fs_info->debug_kobj, btrfs_debug_mount_attrs);
- if (error)
- goto failure;
- /* Discard directory */
- fs_info->discard_debug_kobj = kobject_create_and_add("discard",
- fs_info->debug_kobj);
- if (!fs_info->discard_debug_kobj) {
- error = -ENOMEM;
- goto failure;
- }
- error = sysfs_create_files(fs_info->discard_debug_kobj,
- discard_debug_attrs);
- if (error)
- goto failure;
- #endif
- error = addrm_unknown_feature_attrs(fs_info, true);
- if (error)
- goto failure;
- error = sysfs_create_link(fsid_kobj, &fs_info->sb->s_bdi->dev->kobj, "bdi");
- if (error)
- goto failure;
- fs_info->space_info_kobj = kobject_create_and_add("allocation",
- fsid_kobj);
- if (!fs_info->space_info_kobj) {
- error = -ENOMEM;
- goto failure;
- }
- error = sysfs_create_files(fs_info->space_info_kobj, allocation_attrs);
- if (error)
- goto failure;
- return 0;
- failure:
- btrfs_sysfs_remove_mounted(fs_info);
- return error;
- }
- static inline struct btrfs_fs_info *qgroup_kobj_to_fs_info(struct kobject *kobj)
- {
- return to_fs_info(kobj->parent->parent);
- }
- #define QGROUP_ATTR(_member, _show_name) \
- static ssize_t btrfs_qgroup_show_##_member(struct kobject *qgroup_kobj, \
- struct kobj_attribute *a, \
- char *buf) \
- { \
- struct btrfs_fs_info *fs_info = qgroup_kobj_to_fs_info(qgroup_kobj); \
- struct btrfs_qgroup *qgroup = container_of(qgroup_kobj, \
- struct btrfs_qgroup, kobj); \
- return btrfs_show_u64(&qgroup->_member, &fs_info->qgroup_lock, buf); \
- } \
- BTRFS_ATTR(qgroup, _show_name, btrfs_qgroup_show_##_member)
- #define QGROUP_RSV_ATTR(_name, _type) \
- static ssize_t btrfs_qgroup_rsv_show_##_name(struct kobject *qgroup_kobj, \
- struct kobj_attribute *a, \
- char *buf) \
- { \
- struct btrfs_fs_info *fs_info = qgroup_kobj_to_fs_info(qgroup_kobj); \
- struct btrfs_qgroup *qgroup = container_of(qgroup_kobj, \
- struct btrfs_qgroup, kobj); \
- return btrfs_show_u64(&qgroup->rsv.values[_type], \
- &fs_info->qgroup_lock, buf); \
- } \
- BTRFS_ATTR(qgroup, rsv_##_name, btrfs_qgroup_rsv_show_##_name)
- QGROUP_ATTR(rfer, referenced);
- QGROUP_ATTR(excl, exclusive);
- QGROUP_ATTR(max_rfer, max_referenced);
- QGROUP_ATTR(max_excl, max_exclusive);
- QGROUP_ATTR(lim_flags, limit_flags);
- QGROUP_RSV_ATTR(data, BTRFS_QGROUP_RSV_DATA);
- QGROUP_RSV_ATTR(meta_pertrans, BTRFS_QGROUP_RSV_META_PERTRANS);
- QGROUP_RSV_ATTR(meta_prealloc, BTRFS_QGROUP_RSV_META_PREALLOC);
- static struct attribute *qgroup_attrs[] = {
- BTRFS_ATTR_PTR(qgroup, referenced),
- BTRFS_ATTR_PTR(qgroup, exclusive),
- BTRFS_ATTR_PTR(qgroup, max_referenced),
- BTRFS_ATTR_PTR(qgroup, max_exclusive),
- BTRFS_ATTR_PTR(qgroup, limit_flags),
- BTRFS_ATTR_PTR(qgroup, rsv_data),
- BTRFS_ATTR_PTR(qgroup, rsv_meta_pertrans),
- BTRFS_ATTR_PTR(qgroup, rsv_meta_prealloc),
- NULL
- };
- ATTRIBUTE_GROUPS(qgroup);
- static void qgroup_release(struct kobject *kobj)
- {
- struct btrfs_qgroup *qgroup = container_of(kobj, struct btrfs_qgroup, kobj);
- memset(&qgroup->kobj, 0, sizeof(*kobj));
- }
- static struct kobj_type qgroup_ktype = {
- .sysfs_ops = &kobj_sysfs_ops,
- .release = qgroup_release,
- .default_groups = qgroup_groups,
- };
- int btrfs_sysfs_add_one_qgroup(struct btrfs_fs_info *fs_info,
- struct btrfs_qgroup *qgroup)
- {
- struct kobject *qgroups_kobj = fs_info->qgroups_kobj;
- int ret;
- if (test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state))
- return 0;
- if (qgroup->kobj.state_initialized)
- return 0;
- if (!qgroups_kobj)
- return -EINVAL;
- ret = kobject_init_and_add(&qgroup->kobj, &qgroup_ktype, qgroups_kobj,
- "%hu_%llu", btrfs_qgroup_level(qgroup->qgroupid),
- btrfs_qgroup_subvolid(qgroup->qgroupid));
- if (ret < 0)
- kobject_put(&qgroup->kobj);
- return ret;
- }
- void btrfs_sysfs_del_qgroups(struct btrfs_fs_info *fs_info)
- {
- struct btrfs_qgroup *qgroup;
- struct btrfs_qgroup *next;
- if (test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state))
- return;
- rbtree_postorder_for_each_entry_safe(qgroup, next,
- &fs_info->qgroup_tree, node)
- btrfs_sysfs_del_one_qgroup(fs_info, qgroup);
- if (fs_info->qgroups_kobj) {
- kobject_del(fs_info->qgroups_kobj);
- kobject_put(fs_info->qgroups_kobj);
- fs_info->qgroups_kobj = NULL;
- }
- }
- /* Called when qgroups get initialized, thus there is no need for locking */
- int btrfs_sysfs_add_qgroups(struct btrfs_fs_info *fs_info)
- {
- struct kobject *fsid_kobj = &fs_info->fs_devices->fsid_kobj;
- struct btrfs_qgroup *qgroup;
- struct btrfs_qgroup *next;
- int ret = 0;
- if (test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state))
- return 0;
- ASSERT(fsid_kobj);
- if (fs_info->qgroups_kobj)
- return 0;
- fs_info->qgroups_kobj = kobject_create_and_add("qgroups", fsid_kobj);
- if (!fs_info->qgroups_kobj) {
- ret = -ENOMEM;
- goto out;
- }
- rbtree_postorder_for_each_entry_safe(qgroup, next,
- &fs_info->qgroup_tree, node) {
- ret = btrfs_sysfs_add_one_qgroup(fs_info, qgroup);
- if (ret < 0)
- goto out;
- }
- out:
- if (ret < 0)
- btrfs_sysfs_del_qgroups(fs_info);
- return ret;
- }
- void btrfs_sysfs_del_one_qgroup(struct btrfs_fs_info *fs_info,
- struct btrfs_qgroup *qgroup)
- {
- if (test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state))
- return;
- if (qgroup->kobj.state_initialized) {
- kobject_del(&qgroup->kobj);
- kobject_put(&qgroup->kobj);
- }
- }
- /*
- * Change per-fs features in /sys/fs/btrfs/UUID/features to match current
- * values in superblock. Call after any changes to incompat/compat_ro flags
- */
- void btrfs_sysfs_feature_update(struct btrfs_fs_info *fs_info,
- u64 bit, enum btrfs_feature_set set)
- {
- struct btrfs_fs_devices *fs_devs;
- struct kobject *fsid_kobj;
- u64 __maybe_unused features;
- int __maybe_unused ret;
- if (!fs_info)
- return;
- /*
- * See 14e46e04958df74 and e410e34fad913dd, feature bit updates are not
- * safe when called from some contexts (eg. balance)
- */
- features = get_features(fs_info, set);
- ASSERT(bit & supported_feature_masks[set]);
- fs_devs = fs_info->fs_devices;
- fsid_kobj = &fs_devs->fsid_kobj;
- if (!fsid_kobj->state_initialized)
- return;
- /*
- * FIXME: this is too heavy to update just one value, ideally we'd like
- * to use sysfs_update_group but some refactoring is needed first.
- */
- sysfs_remove_group(fsid_kobj, &btrfs_feature_attr_group);
- ret = sysfs_create_group(fsid_kobj, &btrfs_feature_attr_group);
- }
- int __init btrfs_init_sysfs(void)
- {
- int ret;
- btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj);
- if (!btrfs_kset)
- return -ENOMEM;
- init_feature_attrs();
- ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_feature_attr_group);
- if (ret)
- goto out2;
- ret = sysfs_merge_group(&btrfs_kset->kobj,
- &btrfs_static_feature_attr_group);
- if (ret)
- goto out_remove_group;
- #ifdef CONFIG_BTRFS_DEBUG
- ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_debug_feature_attr_group);
- if (ret)
- goto out2;
- #endif
- return 0;
- out_remove_group:
- sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group);
- out2:
- kset_unregister(btrfs_kset);
- return ret;
- }
- void __cold btrfs_exit_sysfs(void)
- {
- sysfs_unmerge_group(&btrfs_kset->kobj,
- &btrfs_static_feature_attr_group);
- sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group);
- #ifdef CONFIG_BTRFS_DEBUG
- sysfs_remove_group(&btrfs_kset->kobj, &btrfs_debug_feature_attr_group);
- #endif
- kset_unregister(btrfs_kset);
- }
|