1c1d7c514SDavid Sterba // SPDX-License-Identifier: GPL-2.0 26cbd5570SChris Mason /* 36cbd5570SChris Mason * Copyright (C) 2007 Oracle. All rights reserved. 46cbd5570SChris Mason */ 56cbd5570SChris Mason 658176a96SJosef Bacik #include <linux/sched.h> 732a9991fSDavid Sterba #include <linux/sched/mm.h> 858176a96SJosef Bacik #include <linux/slab.h> 958176a96SJosef Bacik #include <linux/spinlock.h> 1058176a96SJosef Bacik #include <linux/completion.h> 1179da4fa4SJeff Mahoney #include <linux/bug.h> 1241e6d2a8SJohannes Thumshirn #include <crypto/hash.h> 1358176a96SJosef Bacik 14bae45de0SChris Mason #include "ctree.h" 15dfb79ddbSDennis Zhou #include "discard.h" 16bae45de0SChris Mason #include "disk-io.h" 177573df55SOmar Sandoval #include "send.h" 18bae45de0SChris Mason #include "transaction.h" 19079b72bcSJeff Mahoney #include "sysfs.h" 2029e5be24SJeff Mahoney #include "volumes.h" 218719aaaeSJosef Bacik #include "space-info.h" 22aac0023cSJosef Bacik #include "block-group.h" 2349e5fb46SQu Wenruo #include "qgroup.h" 24079b72bcSJeff Mahoney 259188db61SDavid Sterba struct btrfs_feature_attr { 269188db61SDavid Sterba struct kobj_attribute kobj_attr; 279188db61SDavid Sterba enum btrfs_feature_set feature_set; 289188db61SDavid Sterba u64 feature_bit; 299188db61SDavid Sterba }; 309188db61SDavid Sterba 319188db61SDavid Sterba /* For raid type sysfs entries */ 329188db61SDavid Sterba struct raid_kobject { 339188db61SDavid Sterba u64 flags; 349188db61SDavid Sterba struct kobject kobj; 359188db61SDavid Sterba }; 369188db61SDavid Sterba 379188db61SDavid Sterba #define __INIT_KOBJ_ATTR(_name, _mode, _show, _store) \ 389188db61SDavid Sterba { \ 399188db61SDavid Sterba .attr = { .name = __stringify(_name), .mode = _mode }, \ 409188db61SDavid Sterba .show = _show, \ 419188db61SDavid Sterba .store = _store, \ 429188db61SDavid Sterba } 439188db61SDavid Sterba 449188db61SDavid Sterba #define BTRFS_ATTR_RW(_prefix, _name, _show, _store) \ 459188db61SDavid Sterba static struct kobj_attribute btrfs_attr_##_prefix##_##_name = \ 469188db61SDavid Sterba __INIT_KOBJ_ATTR(_name, 0644, _show, _store) 479188db61SDavid Sterba 489188db61SDavid Sterba #define BTRFS_ATTR(_prefix, _name, _show) \ 499188db61SDavid Sterba static struct kobj_attribute btrfs_attr_##_prefix##_##_name = \ 509188db61SDavid Sterba __INIT_KOBJ_ATTR(_name, 0444, _show, NULL) 519188db61SDavid Sterba 529188db61SDavid Sterba #define BTRFS_ATTR_PTR(_prefix, _name) \ 539188db61SDavid Sterba (&btrfs_attr_##_prefix##_##_name.attr) 549188db61SDavid Sterba 559188db61SDavid Sterba #define BTRFS_FEAT_ATTR(_name, _feature_set, _feature_prefix, _feature_bit) \ 569188db61SDavid Sterba static struct btrfs_feature_attr btrfs_attr_features_##_name = { \ 579188db61SDavid Sterba .kobj_attr = __INIT_KOBJ_ATTR(_name, S_IRUGO, \ 589188db61SDavid Sterba btrfs_feature_attr_show, \ 599188db61SDavid Sterba btrfs_feature_attr_store), \ 609188db61SDavid Sterba .feature_set = _feature_set, \ 619188db61SDavid Sterba .feature_bit = _feature_prefix ##_## _feature_bit, \ 629188db61SDavid Sterba } 639188db61SDavid Sterba #define BTRFS_FEAT_ATTR_PTR(_name) \ 649188db61SDavid Sterba (&btrfs_attr_features_##_name.kobj_attr.attr) 659188db61SDavid Sterba 669188db61SDavid Sterba #define BTRFS_FEAT_ATTR_COMPAT(name, feature) \ 679188db61SDavid Sterba BTRFS_FEAT_ATTR(name, FEAT_COMPAT, BTRFS_FEATURE_COMPAT, feature) 689188db61SDavid Sterba #define BTRFS_FEAT_ATTR_COMPAT_RO(name, feature) \ 699188db61SDavid Sterba BTRFS_FEAT_ATTR(name, FEAT_COMPAT_RO, BTRFS_FEATURE_COMPAT_RO, feature) 709188db61SDavid Sterba #define BTRFS_FEAT_ATTR_INCOMPAT(name, feature) \ 719188db61SDavid Sterba BTRFS_FEAT_ATTR(name, FEAT_INCOMPAT, BTRFS_FEATURE_INCOMPAT, feature) 729188db61SDavid Sterba 73510d7360SJeff Mahoney static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj); 742e7910d6SAnand Jain static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj); 755ac1d209SJeff Mahoney 768f52316cSDavid Sterba static struct btrfs_feature_attr *to_btrfs_feature_attr(struct kobj_attribute *a) 778f52316cSDavid Sterba { 788f52316cSDavid Sterba return container_of(a, struct btrfs_feature_attr, kobj_attr); 798f52316cSDavid Sterba } 808f52316cSDavid Sterba 818f52316cSDavid Sterba static struct kobj_attribute *attr_to_btrfs_attr(struct attribute *attr) 828f52316cSDavid Sterba { 838f52316cSDavid Sterba return container_of(attr, struct kobj_attribute, attr); 848f52316cSDavid Sterba } 858f52316cSDavid Sterba 868f52316cSDavid Sterba static struct btrfs_feature_attr *attr_to_btrfs_feature_attr( 878f52316cSDavid Sterba struct attribute *attr) 888f52316cSDavid Sterba { 898f52316cSDavid Sterba return to_btrfs_feature_attr(attr_to_btrfs_attr(attr)); 908f52316cSDavid Sterba } 918f52316cSDavid Sterba 92510d7360SJeff Mahoney static u64 get_features(struct btrfs_fs_info *fs_info, 93510d7360SJeff Mahoney enum btrfs_feature_set set) 945ac1d209SJeff Mahoney { 95510d7360SJeff Mahoney struct btrfs_super_block *disk_super = fs_info->super_copy; 96510d7360SJeff Mahoney if (set == FEAT_COMPAT) 97510d7360SJeff Mahoney return btrfs_super_compat_flags(disk_super); 98510d7360SJeff Mahoney else if (set == FEAT_COMPAT_RO) 99510d7360SJeff Mahoney return btrfs_super_compat_ro_flags(disk_super); 100510d7360SJeff Mahoney else 101510d7360SJeff Mahoney return btrfs_super_incompat_flags(disk_super); 1025ac1d209SJeff Mahoney } 1035ac1d209SJeff Mahoney 104ba631941SJeff Mahoney static void set_features(struct btrfs_fs_info *fs_info, 105ba631941SJeff Mahoney enum btrfs_feature_set set, u64 features) 106ba631941SJeff Mahoney { 107ba631941SJeff Mahoney struct btrfs_super_block *disk_super = fs_info->super_copy; 108ba631941SJeff Mahoney if (set == FEAT_COMPAT) 109ba631941SJeff Mahoney btrfs_set_super_compat_flags(disk_super, features); 110ba631941SJeff Mahoney else if (set == FEAT_COMPAT_RO) 111ba631941SJeff Mahoney btrfs_set_super_compat_ro_flags(disk_super, features); 112ba631941SJeff Mahoney else 113ba631941SJeff Mahoney btrfs_set_super_incompat_flags(disk_super, features); 114ba631941SJeff Mahoney } 115ba631941SJeff Mahoney 116ba631941SJeff Mahoney static int can_modify_feature(struct btrfs_feature_attr *fa) 117ba631941SJeff Mahoney { 118ba631941SJeff Mahoney int val = 0; 119ba631941SJeff Mahoney u64 set, clear; 120ba631941SJeff Mahoney switch (fa->feature_set) { 121ba631941SJeff Mahoney case FEAT_COMPAT: 122ba631941SJeff Mahoney set = BTRFS_FEATURE_COMPAT_SAFE_SET; 123ba631941SJeff Mahoney clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR; 124ba631941SJeff Mahoney break; 125ba631941SJeff Mahoney case FEAT_COMPAT_RO: 126ba631941SJeff Mahoney set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET; 127ba631941SJeff Mahoney clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR; 128ba631941SJeff Mahoney break; 129ba631941SJeff Mahoney case FEAT_INCOMPAT: 130ba631941SJeff Mahoney set = BTRFS_FEATURE_INCOMPAT_SAFE_SET; 131ba631941SJeff Mahoney clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR; 132ba631941SJeff Mahoney break; 133ba631941SJeff Mahoney default: 13462e85577SJeff Mahoney pr_warn("btrfs: sysfs: unknown feature set %d\n", 135cc37bb04SDavid Sterba fa->feature_set); 136cc37bb04SDavid Sterba return 0; 137ba631941SJeff Mahoney } 138ba631941SJeff Mahoney 139ba631941SJeff Mahoney if (set & fa->feature_bit) 140ba631941SJeff Mahoney val |= 1; 141ba631941SJeff Mahoney if (clear & fa->feature_bit) 142ba631941SJeff Mahoney val |= 2; 143ba631941SJeff Mahoney 144ba631941SJeff Mahoney return val; 145ba631941SJeff Mahoney } 146ba631941SJeff Mahoney 147079b72bcSJeff Mahoney static ssize_t btrfs_feature_attr_show(struct kobject *kobj, 148079b72bcSJeff Mahoney struct kobj_attribute *a, char *buf) 149079b72bcSJeff Mahoney { 150510d7360SJeff Mahoney int val = 0; 151510d7360SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj); 152510d7360SJeff Mahoney struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a); 153ba631941SJeff Mahoney if (fs_info) { 154510d7360SJeff Mahoney u64 features = get_features(fs_info, fa->feature_set); 155510d7360SJeff Mahoney if (features & fa->feature_bit) 156510d7360SJeff Mahoney val = 1; 157ba631941SJeff Mahoney } else 158ba631941SJeff Mahoney val = can_modify_feature(fa); 159510d7360SJeff Mahoney 160abdd9febSTakashi Iwai return scnprintf(buf, PAGE_SIZE, "%d\n", val); 161510d7360SJeff Mahoney } 162510d7360SJeff Mahoney 163ba631941SJeff Mahoney static ssize_t btrfs_feature_attr_store(struct kobject *kobj, 164ba631941SJeff Mahoney struct kobj_attribute *a, 165ba631941SJeff Mahoney const char *buf, size_t count) 166ba631941SJeff Mahoney { 167ba631941SJeff Mahoney struct btrfs_fs_info *fs_info; 168ba631941SJeff Mahoney struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a); 169ba631941SJeff Mahoney u64 features, set, clear; 170ba631941SJeff Mahoney unsigned long val; 171ba631941SJeff Mahoney int ret; 172ba631941SJeff Mahoney 173ba631941SJeff Mahoney fs_info = to_fs_info(kobj); 174ba631941SJeff Mahoney if (!fs_info) 175ba631941SJeff Mahoney return -EPERM; 176ba631941SJeff Mahoney 177bc98a42cSDavid Howells if (sb_rdonly(fs_info->sb)) 178ee611138SDavid Sterba return -EROFS; 179ee611138SDavid Sterba 180ba631941SJeff Mahoney ret = kstrtoul(skip_spaces(buf), 0, &val); 181ba631941SJeff Mahoney if (ret) 182ba631941SJeff Mahoney return ret; 183ba631941SJeff Mahoney 184ba631941SJeff Mahoney if (fa->feature_set == FEAT_COMPAT) { 185ba631941SJeff Mahoney set = BTRFS_FEATURE_COMPAT_SAFE_SET; 186ba631941SJeff Mahoney clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR; 187ba631941SJeff Mahoney } else if (fa->feature_set == FEAT_COMPAT_RO) { 188ba631941SJeff Mahoney set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET; 189ba631941SJeff Mahoney clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR; 190ba631941SJeff Mahoney } else { 191ba631941SJeff Mahoney set = BTRFS_FEATURE_INCOMPAT_SAFE_SET; 192ba631941SJeff Mahoney clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR; 193ba631941SJeff Mahoney } 194ba631941SJeff Mahoney 195ba631941SJeff Mahoney features = get_features(fs_info, fa->feature_set); 196ba631941SJeff Mahoney 197ba631941SJeff Mahoney /* Nothing to do */ 198ba631941SJeff Mahoney if ((val && (features & fa->feature_bit)) || 199ba631941SJeff Mahoney (!val && !(features & fa->feature_bit))) 200ba631941SJeff Mahoney return count; 201ba631941SJeff Mahoney 202ba631941SJeff Mahoney if ((val && !(set & fa->feature_bit)) || 203ba631941SJeff Mahoney (!val && !(clear & fa->feature_bit))) { 204ba631941SJeff Mahoney btrfs_info(fs_info, 205ba631941SJeff Mahoney "%sabling feature %s on mounted fs is not supported.", 206ba631941SJeff Mahoney val ? "En" : "Dis", fa->kobj_attr.attr.name); 207ba631941SJeff Mahoney return -EPERM; 208ba631941SJeff Mahoney } 209ba631941SJeff Mahoney 210ba631941SJeff Mahoney btrfs_info(fs_info, "%s %s feature flag", 211ba631941SJeff Mahoney val ? "Setting" : "Clearing", fa->kobj_attr.attr.name); 212ba631941SJeff Mahoney 213ba631941SJeff Mahoney spin_lock(&fs_info->super_lock); 214ba631941SJeff Mahoney features = get_features(fs_info, fa->feature_set); 215ba631941SJeff Mahoney if (val) 216ba631941SJeff Mahoney features |= fa->feature_bit; 217ba631941SJeff Mahoney else 218ba631941SJeff Mahoney features &= ~fa->feature_bit; 219ba631941SJeff Mahoney set_features(fs_info, fa->feature_set, features); 220ba631941SJeff Mahoney spin_unlock(&fs_info->super_lock); 221ba631941SJeff Mahoney 2220eae2747SDavid Sterba /* 2230eae2747SDavid Sterba * We don't want to do full transaction commit from inside sysfs 2240eae2747SDavid Sterba */ 2250eae2747SDavid Sterba btrfs_set_pending(fs_info, COMMIT); 2260eae2747SDavid Sterba wake_up_process(fs_info->transaction_kthread); 227ba631941SJeff Mahoney 228ba631941SJeff Mahoney return count; 229ba631941SJeff Mahoney } 230ba631941SJeff Mahoney 231510d7360SJeff Mahoney static umode_t btrfs_feature_visible(struct kobject *kobj, 232510d7360SJeff Mahoney struct attribute *attr, int unused) 233510d7360SJeff Mahoney { 234510d7360SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj); 235510d7360SJeff Mahoney umode_t mode = attr->mode; 236510d7360SJeff Mahoney 237510d7360SJeff Mahoney if (fs_info) { 238510d7360SJeff Mahoney struct btrfs_feature_attr *fa; 239510d7360SJeff Mahoney u64 features; 240510d7360SJeff Mahoney 241510d7360SJeff Mahoney fa = attr_to_btrfs_feature_attr(attr); 242510d7360SJeff Mahoney features = get_features(fs_info, fa->feature_set); 243510d7360SJeff Mahoney 244ba631941SJeff Mahoney if (can_modify_feature(fa)) 245ba631941SJeff Mahoney mode |= S_IWUSR; 246ba631941SJeff Mahoney else if (!(features & fa->feature_bit)) 247510d7360SJeff Mahoney mode = 0; 248510d7360SJeff Mahoney } 249510d7360SJeff Mahoney 250510d7360SJeff Mahoney return mode; 251079b72bcSJeff Mahoney } 252079b72bcSJeff Mahoney 253079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(mixed_backref, MIXED_BACKREF); 254079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(default_subvol, DEFAULT_SUBVOL); 255079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(mixed_groups, MIXED_GROUPS); 256079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(compress_lzo, COMPRESS_LZO); 2575c1aab1dSNick Terrell BTRFS_FEAT_ATTR_INCOMPAT(compress_zstd, COMPRESS_ZSTD); 258079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(big_metadata, BIG_METADATA); 259079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(extended_iref, EXTENDED_IREF); 260079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(raid56, RAID56); 261079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(skinny_metadata, SKINNY_METADATA); 262c736c095SDavid Sterba BTRFS_FEAT_ATTR_INCOMPAT(no_holes, NO_HOLES); 26356f20f40SNikolay Borisov BTRFS_FEAT_ATTR_INCOMPAT(metadata_uuid, METADATA_UUID); 2643b5bb73bSDavid Sterba BTRFS_FEAT_ATTR_COMPAT_RO(free_space_tree, FREE_SPACE_TREE); 265cfbb825cSDavid Sterba BTRFS_FEAT_ATTR_INCOMPAT(raid1c34, RAID1C34); 266079b72bcSJeff Mahoney 267079b72bcSJeff Mahoney static struct attribute *btrfs_supported_feature_attrs[] = { 268079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(mixed_backref), 269079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(default_subvol), 270079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(mixed_groups), 271079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(compress_lzo), 2725c1aab1dSNick Terrell BTRFS_FEAT_ATTR_PTR(compress_zstd), 273079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(big_metadata), 274079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(extended_iref), 275079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(raid56), 276079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(skinny_metadata), 277c736c095SDavid Sterba BTRFS_FEAT_ATTR_PTR(no_holes), 27856f20f40SNikolay Borisov BTRFS_FEAT_ATTR_PTR(metadata_uuid), 2793b5bb73bSDavid Sterba BTRFS_FEAT_ATTR_PTR(free_space_tree), 280cfbb825cSDavid Sterba BTRFS_FEAT_ATTR_PTR(raid1c34), 281079b72bcSJeff Mahoney NULL 282079b72bcSJeff Mahoney }; 283079b72bcSJeff Mahoney 284f902bd3aSMisono Tomohiro /* 285f902bd3aSMisono Tomohiro * Features which depend on feature bits and may differ between each fs. 286f902bd3aSMisono Tomohiro * 287f902bd3aSMisono Tomohiro * /sys/fs/btrfs/features lists all available features of this kernel while 288f902bd3aSMisono Tomohiro * /sys/fs/btrfs/UUID/features shows features of the fs which are enabled or 289f902bd3aSMisono Tomohiro * can be changed online. 290f902bd3aSMisono Tomohiro */ 291079b72bcSJeff Mahoney static const struct attribute_group btrfs_feature_attr_group = { 292079b72bcSJeff Mahoney .name = "features", 293510d7360SJeff Mahoney .is_visible = btrfs_feature_visible, 294079b72bcSJeff Mahoney .attrs = btrfs_supported_feature_attrs, 295079b72bcSJeff Mahoney }; 29658176a96SJosef Bacik 297f902bd3aSMisono Tomohiro static ssize_t rmdir_subvol_show(struct kobject *kobj, 298f902bd3aSMisono Tomohiro struct kobj_attribute *ka, char *buf) 299f902bd3aSMisono Tomohiro { 300abdd9febSTakashi Iwai return scnprintf(buf, PAGE_SIZE, "0\n"); 301f902bd3aSMisono Tomohiro } 302f902bd3aSMisono Tomohiro BTRFS_ATTR(static_feature, rmdir_subvol, rmdir_subvol_show); 303f902bd3aSMisono Tomohiro 304f7cea56cSDavid Sterba static ssize_t supported_checksums_show(struct kobject *kobj, 305f7cea56cSDavid Sterba struct kobj_attribute *a, char *buf) 306f7cea56cSDavid Sterba { 307f7cea56cSDavid Sterba ssize_t ret = 0; 308f7cea56cSDavid Sterba int i; 309f7cea56cSDavid Sterba 310f7cea56cSDavid Sterba for (i = 0; i < btrfs_get_num_csums(); i++) { 311f7cea56cSDavid Sterba /* 312f7cea56cSDavid Sterba * This "trick" only works as long as 'enum btrfs_csum_type' has 313f7cea56cSDavid Sterba * no holes in it 314f7cea56cSDavid Sterba */ 315abdd9febSTakashi Iwai ret += scnprintf(buf + ret, PAGE_SIZE - ret, "%s%s", 316f7cea56cSDavid Sterba (i == 0 ? "" : " "), btrfs_super_csum_name(i)); 317f7cea56cSDavid Sterba 318f7cea56cSDavid Sterba } 319f7cea56cSDavid Sterba 320abdd9febSTakashi Iwai ret += scnprintf(buf + ret, PAGE_SIZE - ret, "\n"); 321f7cea56cSDavid Sterba return ret; 322f7cea56cSDavid Sterba } 323f7cea56cSDavid Sterba BTRFS_ATTR(static_feature, supported_checksums, supported_checksums_show); 324f7cea56cSDavid Sterba 3257573df55SOmar Sandoval static ssize_t send_stream_version_show(struct kobject *kobj, 3267573df55SOmar Sandoval struct kobj_attribute *ka, char *buf) 3277573df55SOmar Sandoval { 3287573df55SOmar Sandoval return snprintf(buf, PAGE_SIZE, "%d\n", BTRFS_SEND_STREAM_VERSION); 3297573df55SOmar Sandoval } 3307573df55SOmar Sandoval BTRFS_ATTR(static_feature, send_stream_version, send_stream_version_show); 3317573df55SOmar Sandoval 332ceafe3ccSJosef Bacik static const char *rescue_opts[] = { 333ceafe3ccSJosef Bacik "usebackuproot", 334ceafe3ccSJosef Bacik "nologreplay", 33542437a63SJosef Bacik "ignorebadroots", 336*882dbe0cSJosef Bacik "ignoredatacsums", 337ceafe3ccSJosef Bacik }; 338ceafe3ccSJosef Bacik 339ceafe3ccSJosef Bacik static ssize_t supported_rescue_options_show(struct kobject *kobj, 340ceafe3ccSJosef Bacik struct kobj_attribute *a, 341ceafe3ccSJosef Bacik char *buf) 342ceafe3ccSJosef Bacik { 343ceafe3ccSJosef Bacik ssize_t ret = 0; 344ceafe3ccSJosef Bacik int i; 345ceafe3ccSJosef Bacik 346ceafe3ccSJosef Bacik for (i = 0; i < ARRAY_SIZE(rescue_opts); i++) 347ceafe3ccSJosef Bacik ret += scnprintf(buf + ret, PAGE_SIZE - ret, "%s%s", 348ceafe3ccSJosef Bacik (i ? " " : ""), rescue_opts[i]); 349ceafe3ccSJosef Bacik ret += scnprintf(buf + ret, PAGE_SIZE - ret, "\n"); 350ceafe3ccSJosef Bacik return ret; 351ceafe3ccSJosef Bacik } 352ceafe3ccSJosef Bacik BTRFS_ATTR(static_feature, supported_rescue_options, 353ceafe3ccSJosef Bacik supported_rescue_options_show); 354ceafe3ccSJosef Bacik 355f902bd3aSMisono Tomohiro static struct attribute *btrfs_supported_static_feature_attrs[] = { 356f902bd3aSMisono Tomohiro BTRFS_ATTR_PTR(static_feature, rmdir_subvol), 357f7cea56cSDavid Sterba BTRFS_ATTR_PTR(static_feature, supported_checksums), 3587573df55SOmar Sandoval BTRFS_ATTR_PTR(static_feature, send_stream_version), 359ceafe3ccSJosef Bacik BTRFS_ATTR_PTR(static_feature, supported_rescue_options), 360f902bd3aSMisono Tomohiro NULL 361f902bd3aSMisono Tomohiro }; 362f902bd3aSMisono Tomohiro 363f902bd3aSMisono Tomohiro /* 364f902bd3aSMisono Tomohiro * Features which only depend on kernel version. 365f902bd3aSMisono Tomohiro * 366f902bd3aSMisono Tomohiro * These are listed in /sys/fs/btrfs/features along with 367f902bd3aSMisono Tomohiro * btrfs_feature_attr_group 368f902bd3aSMisono Tomohiro */ 369f902bd3aSMisono Tomohiro static const struct attribute_group btrfs_static_feature_attr_group = { 370f902bd3aSMisono Tomohiro .name = "features", 371f902bd3aSMisono Tomohiro .attrs = btrfs_supported_static_feature_attrs, 372f902bd3aSMisono Tomohiro }; 373f902bd3aSMisono Tomohiro 3746e369febSDavid Sterba #ifdef CONFIG_BTRFS_DEBUG 3756e369febSDavid Sterba 3766e369febSDavid Sterba /* 377e4faab84SDennis Zhou * Discard statistics and tunables 378e4faab84SDennis Zhou */ 379dfb79ddbSDennis Zhou #define discard_to_fs_info(_kobj) to_fs_info((_kobj)->parent->parent) 380dfb79ddbSDennis Zhou 3815dc7c10bSDennis Zhou static ssize_t btrfs_discardable_bytes_show(struct kobject *kobj, 3825dc7c10bSDennis Zhou struct kobj_attribute *a, 3835dc7c10bSDennis Zhou char *buf) 3845dc7c10bSDennis Zhou { 3855dc7c10bSDennis Zhou struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 3865dc7c10bSDennis Zhou 387abdd9febSTakashi Iwai return scnprintf(buf, PAGE_SIZE, "%lld\n", 3885dc7c10bSDennis Zhou atomic64_read(&fs_info->discard_ctl.discardable_bytes)); 3895dc7c10bSDennis Zhou } 3905dc7c10bSDennis Zhou BTRFS_ATTR(discard, discardable_bytes, btrfs_discardable_bytes_show); 3915dc7c10bSDennis Zhou 392dfb79ddbSDennis Zhou static ssize_t btrfs_discardable_extents_show(struct kobject *kobj, 393dfb79ddbSDennis Zhou struct kobj_attribute *a, 394dfb79ddbSDennis Zhou char *buf) 395dfb79ddbSDennis Zhou { 396dfb79ddbSDennis Zhou struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 397dfb79ddbSDennis Zhou 398abdd9febSTakashi Iwai return scnprintf(buf, PAGE_SIZE, "%d\n", 399dfb79ddbSDennis Zhou atomic_read(&fs_info->discard_ctl.discardable_extents)); 400dfb79ddbSDennis Zhou } 401dfb79ddbSDennis Zhou BTRFS_ATTR(discard, discardable_extents, btrfs_discardable_extents_show); 402dfb79ddbSDennis Zhou 4039ddf648fSDennis Zhou static ssize_t btrfs_discard_bitmap_bytes_show(struct kobject *kobj, 4049ddf648fSDennis Zhou struct kobj_attribute *a, 4059ddf648fSDennis Zhou char *buf) 4069ddf648fSDennis Zhou { 4079ddf648fSDennis Zhou struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 4089ddf648fSDennis Zhou 409abdd9febSTakashi Iwai return scnprintf(buf, PAGE_SIZE, "%lld\n", 4109ddf648fSDennis Zhou fs_info->discard_ctl.discard_bitmap_bytes); 4119ddf648fSDennis Zhou } 4129ddf648fSDennis Zhou BTRFS_ATTR(discard, discard_bitmap_bytes, btrfs_discard_bitmap_bytes_show); 4139ddf648fSDennis Zhou 4149ddf648fSDennis Zhou static ssize_t btrfs_discard_bytes_saved_show(struct kobject *kobj, 4159ddf648fSDennis Zhou struct kobj_attribute *a, 4169ddf648fSDennis Zhou char *buf) 4179ddf648fSDennis Zhou { 4189ddf648fSDennis Zhou struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 4199ddf648fSDennis Zhou 420abdd9febSTakashi Iwai return scnprintf(buf, PAGE_SIZE, "%lld\n", 4219ddf648fSDennis Zhou atomic64_read(&fs_info->discard_ctl.discard_bytes_saved)); 4229ddf648fSDennis Zhou } 4239ddf648fSDennis Zhou BTRFS_ATTR(discard, discard_bytes_saved, btrfs_discard_bytes_saved_show); 4249ddf648fSDennis Zhou 4259ddf648fSDennis Zhou static ssize_t btrfs_discard_extent_bytes_show(struct kobject *kobj, 4269ddf648fSDennis Zhou struct kobj_attribute *a, 4279ddf648fSDennis Zhou char *buf) 4289ddf648fSDennis Zhou { 4299ddf648fSDennis Zhou struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 4309ddf648fSDennis Zhou 431abdd9febSTakashi Iwai return scnprintf(buf, PAGE_SIZE, "%lld\n", 4329ddf648fSDennis Zhou fs_info->discard_ctl.discard_extent_bytes); 4339ddf648fSDennis Zhou } 4349ddf648fSDennis Zhou BTRFS_ATTR(discard, discard_extent_bytes, btrfs_discard_extent_bytes_show); 4359ddf648fSDennis Zhou 436a2309300SDennis Zhou static ssize_t btrfs_discard_iops_limit_show(struct kobject *kobj, 437a2309300SDennis Zhou struct kobj_attribute *a, 438a2309300SDennis Zhou char *buf) 439a2309300SDennis Zhou { 440a2309300SDennis Zhou struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 441a2309300SDennis Zhou 442abdd9febSTakashi Iwai return scnprintf(buf, PAGE_SIZE, "%u\n", 443a2309300SDennis Zhou READ_ONCE(fs_info->discard_ctl.iops_limit)); 444a2309300SDennis Zhou } 445a2309300SDennis Zhou 446a2309300SDennis Zhou static ssize_t btrfs_discard_iops_limit_store(struct kobject *kobj, 447a2309300SDennis Zhou struct kobj_attribute *a, 448a2309300SDennis Zhou const char *buf, size_t len) 449a2309300SDennis Zhou { 450a2309300SDennis Zhou struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 451a2309300SDennis Zhou struct btrfs_discard_ctl *discard_ctl = &fs_info->discard_ctl; 452a2309300SDennis Zhou u32 iops_limit; 453a2309300SDennis Zhou int ret; 454a2309300SDennis Zhou 455a2309300SDennis Zhou ret = kstrtou32(buf, 10, &iops_limit); 456a2309300SDennis Zhou if (ret) 457a2309300SDennis Zhou return -EINVAL; 458a2309300SDennis Zhou 459a2309300SDennis Zhou WRITE_ONCE(discard_ctl->iops_limit, iops_limit); 460a2309300SDennis Zhou 461a2309300SDennis Zhou return len; 462a2309300SDennis Zhou } 463a2309300SDennis Zhou BTRFS_ATTR_RW(discard, iops_limit, btrfs_discard_iops_limit_show, 464a2309300SDennis Zhou btrfs_discard_iops_limit_store); 465a2309300SDennis Zhou 466e93591bbSDennis Zhou static ssize_t btrfs_discard_kbps_limit_show(struct kobject *kobj, 467e93591bbSDennis Zhou struct kobj_attribute *a, 468e93591bbSDennis Zhou char *buf) 469e93591bbSDennis Zhou { 470e93591bbSDennis Zhou struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 471e93591bbSDennis Zhou 472abdd9febSTakashi Iwai return scnprintf(buf, PAGE_SIZE, "%u\n", 473e93591bbSDennis Zhou READ_ONCE(fs_info->discard_ctl.kbps_limit)); 474e93591bbSDennis Zhou } 475e93591bbSDennis Zhou 476e93591bbSDennis Zhou static ssize_t btrfs_discard_kbps_limit_store(struct kobject *kobj, 477e93591bbSDennis Zhou struct kobj_attribute *a, 478e93591bbSDennis Zhou const char *buf, size_t len) 479e93591bbSDennis Zhou { 480e93591bbSDennis Zhou struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 481e93591bbSDennis Zhou struct btrfs_discard_ctl *discard_ctl = &fs_info->discard_ctl; 482e93591bbSDennis Zhou u32 kbps_limit; 483e93591bbSDennis Zhou int ret; 484e93591bbSDennis Zhou 485e93591bbSDennis Zhou ret = kstrtou32(buf, 10, &kbps_limit); 486e93591bbSDennis Zhou if (ret) 487e93591bbSDennis Zhou return -EINVAL; 488e93591bbSDennis Zhou 489e93591bbSDennis Zhou WRITE_ONCE(discard_ctl->kbps_limit, kbps_limit); 490e93591bbSDennis Zhou 491e93591bbSDennis Zhou return len; 492e93591bbSDennis Zhou } 493e93591bbSDennis Zhou BTRFS_ATTR_RW(discard, kbps_limit, btrfs_discard_kbps_limit_show, 494e93591bbSDennis Zhou btrfs_discard_kbps_limit_store); 495e93591bbSDennis Zhou 49619b2a2c7SDennis Zhou static ssize_t btrfs_discard_max_discard_size_show(struct kobject *kobj, 49719b2a2c7SDennis Zhou struct kobj_attribute *a, 49819b2a2c7SDennis Zhou char *buf) 49919b2a2c7SDennis Zhou { 50019b2a2c7SDennis Zhou struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 50119b2a2c7SDennis Zhou 502abdd9febSTakashi Iwai return scnprintf(buf, PAGE_SIZE, "%llu\n", 50319b2a2c7SDennis Zhou READ_ONCE(fs_info->discard_ctl.max_discard_size)); 50419b2a2c7SDennis Zhou } 50519b2a2c7SDennis Zhou 50619b2a2c7SDennis Zhou static ssize_t btrfs_discard_max_discard_size_store(struct kobject *kobj, 50719b2a2c7SDennis Zhou struct kobj_attribute *a, 50819b2a2c7SDennis Zhou const char *buf, size_t len) 50919b2a2c7SDennis Zhou { 51019b2a2c7SDennis Zhou struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 51119b2a2c7SDennis Zhou struct btrfs_discard_ctl *discard_ctl = &fs_info->discard_ctl; 51219b2a2c7SDennis Zhou u64 max_discard_size; 51319b2a2c7SDennis Zhou int ret; 51419b2a2c7SDennis Zhou 51519b2a2c7SDennis Zhou ret = kstrtou64(buf, 10, &max_discard_size); 51619b2a2c7SDennis Zhou if (ret) 51719b2a2c7SDennis Zhou return -EINVAL; 51819b2a2c7SDennis Zhou 51919b2a2c7SDennis Zhou WRITE_ONCE(discard_ctl->max_discard_size, max_discard_size); 52019b2a2c7SDennis Zhou 52119b2a2c7SDennis Zhou return len; 52219b2a2c7SDennis Zhou } 52319b2a2c7SDennis Zhou BTRFS_ATTR_RW(discard, max_discard_size, btrfs_discard_max_discard_size_show, 52419b2a2c7SDennis Zhou btrfs_discard_max_discard_size_store); 52519b2a2c7SDennis Zhou 526e4faab84SDennis Zhou static const struct attribute *discard_debug_attrs[] = { 5275dc7c10bSDennis Zhou BTRFS_ATTR_PTR(discard, discardable_bytes), 528dfb79ddbSDennis Zhou BTRFS_ATTR_PTR(discard, discardable_extents), 5299ddf648fSDennis Zhou BTRFS_ATTR_PTR(discard, discard_bitmap_bytes), 5309ddf648fSDennis Zhou BTRFS_ATTR_PTR(discard, discard_bytes_saved), 5319ddf648fSDennis Zhou BTRFS_ATTR_PTR(discard, discard_extent_bytes), 532a2309300SDennis Zhou BTRFS_ATTR_PTR(discard, iops_limit), 533e93591bbSDennis Zhou BTRFS_ATTR_PTR(discard, kbps_limit), 53419b2a2c7SDennis Zhou BTRFS_ATTR_PTR(discard, max_discard_size), 535e4faab84SDennis Zhou NULL, 536e4faab84SDennis Zhou }; 537e4faab84SDennis Zhou 538e4faab84SDennis Zhou /* 5396e369febSDavid Sterba * Runtime debugging exported via sysfs 5406e369febSDavid Sterba * 5416e369febSDavid Sterba * /sys/fs/btrfs/debug - applies to module or all filesystems 5426e369febSDavid Sterba * /sys/fs/btrfs/UUID - applies only to the given filesystem 5436e369febSDavid Sterba */ 54493945cb4SDennis Zhou static const struct attribute *btrfs_debug_mount_attrs[] = { 54593945cb4SDennis Zhou NULL, 54693945cb4SDennis Zhou }; 54793945cb4SDennis Zhou 5486e369febSDavid Sterba static struct attribute *btrfs_debug_feature_attrs[] = { 5496e369febSDavid Sterba NULL 5506e369febSDavid Sterba }; 5516e369febSDavid Sterba 5526e369febSDavid Sterba static const struct attribute_group btrfs_debug_feature_attr_group = { 5536e369febSDavid Sterba .name = "debug", 5546e369febSDavid Sterba .attrs = btrfs_debug_feature_attrs, 5556e369febSDavid Sterba }; 5566e369febSDavid Sterba 5576e369febSDavid Sterba #endif 5586e369febSDavid Sterba 5596ab0a202SJeff Mahoney static ssize_t btrfs_show_u64(u64 *value_ptr, spinlock_t *lock, char *buf) 5606ab0a202SJeff Mahoney { 5616ab0a202SJeff Mahoney u64 val; 5626ab0a202SJeff Mahoney if (lock) 5636ab0a202SJeff Mahoney spin_lock(lock); 5646ab0a202SJeff Mahoney val = *value_ptr; 5656ab0a202SJeff Mahoney if (lock) 5666ab0a202SJeff Mahoney spin_unlock(lock); 567abdd9febSTakashi Iwai return scnprintf(buf, PAGE_SIZE, "%llu\n", val); 5686ab0a202SJeff Mahoney } 5696ab0a202SJeff Mahoney 5706ab0a202SJeff Mahoney static ssize_t global_rsv_size_show(struct kobject *kobj, 5716ab0a202SJeff Mahoney struct kobj_attribute *ka, char *buf) 5726ab0a202SJeff Mahoney { 5736ab0a202SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); 5746ab0a202SJeff Mahoney struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 5756ab0a202SJeff Mahoney return btrfs_show_u64(&block_rsv->size, &block_rsv->lock, buf); 5766ab0a202SJeff Mahoney } 577a969f4ccSHans van Kranenburg BTRFS_ATTR(allocation, global_rsv_size, global_rsv_size_show); 5786ab0a202SJeff Mahoney 5796ab0a202SJeff Mahoney static ssize_t global_rsv_reserved_show(struct kobject *kobj, 5806ab0a202SJeff Mahoney struct kobj_attribute *a, char *buf) 5816ab0a202SJeff Mahoney { 5826ab0a202SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); 5836ab0a202SJeff Mahoney struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 5846ab0a202SJeff Mahoney return btrfs_show_u64(&block_rsv->reserved, &block_rsv->lock, buf); 5856ab0a202SJeff Mahoney } 586a969f4ccSHans van Kranenburg BTRFS_ATTR(allocation, global_rsv_reserved, global_rsv_reserved_show); 5876ab0a202SJeff Mahoney 5886ab0a202SJeff Mahoney #define to_space_info(_kobj) container_of(_kobj, struct btrfs_space_info, kobj) 589c1895442SJeff Mahoney #define to_raid_kobj(_kobj) container_of(_kobj, struct raid_kobject, kobj) 5906ab0a202SJeff Mahoney 5916ab0a202SJeff Mahoney static ssize_t raid_bytes_show(struct kobject *kobj, 5926ab0a202SJeff Mahoney struct kobj_attribute *attr, char *buf); 593a969f4ccSHans van Kranenburg BTRFS_ATTR(raid, total_bytes, raid_bytes_show); 594a969f4ccSHans van Kranenburg BTRFS_ATTR(raid, used_bytes, raid_bytes_show); 5956ab0a202SJeff Mahoney 5966ab0a202SJeff Mahoney static ssize_t raid_bytes_show(struct kobject *kobj, 5976ab0a202SJeff Mahoney struct kobj_attribute *attr, char *buf) 5986ab0a202SJeff Mahoney 5996ab0a202SJeff Mahoney { 6006ab0a202SJeff Mahoney struct btrfs_space_info *sinfo = to_space_info(kobj->parent); 60132da5386SDavid Sterba struct btrfs_block_group *block_group; 60275cb379dSJeff Mahoney int index = btrfs_bg_flags_to_raid_index(to_raid_kobj(kobj)->flags); 6036ab0a202SJeff Mahoney u64 val = 0; 6046ab0a202SJeff Mahoney 6056ab0a202SJeff Mahoney down_read(&sinfo->groups_sem); 6066ab0a202SJeff Mahoney list_for_each_entry(block_group, &sinfo->block_groups[index], list) { 607a969f4ccSHans van Kranenburg if (&attr->attr == BTRFS_ATTR_PTR(raid, total_bytes)) 608b3470b5dSDavid Sterba val += block_group->length; 6096ab0a202SJeff Mahoney else 610bf38be65SDavid Sterba val += block_group->used; 6116ab0a202SJeff Mahoney } 6126ab0a202SJeff Mahoney up_read(&sinfo->groups_sem); 613abdd9febSTakashi Iwai return scnprintf(buf, PAGE_SIZE, "%llu\n", val); 6146ab0a202SJeff Mahoney } 6156ab0a202SJeff Mahoney 6167c7e3014SKimberly Brown static struct attribute *raid_attrs[] = { 617a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(raid, total_bytes), 618a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(raid, used_bytes), 6196ab0a202SJeff Mahoney NULL 6206ab0a202SJeff Mahoney }; 6217c7e3014SKimberly Brown ATTRIBUTE_GROUPS(raid); 6226ab0a202SJeff Mahoney 6236ab0a202SJeff Mahoney static void release_raid_kobj(struct kobject *kobj) 6246ab0a202SJeff Mahoney { 625c1895442SJeff Mahoney kfree(to_raid_kobj(kobj)); 6266ab0a202SJeff Mahoney } 6276ab0a202SJeff Mahoney 628536ea45cSDavid Sterba static struct kobj_type btrfs_raid_ktype = { 6296ab0a202SJeff Mahoney .sysfs_ops = &kobj_sysfs_ops, 6306ab0a202SJeff Mahoney .release = release_raid_kobj, 6317c7e3014SKimberly Brown .default_groups = raid_groups, 6326ab0a202SJeff Mahoney }; 6336ab0a202SJeff Mahoney 6346ab0a202SJeff Mahoney #define SPACE_INFO_ATTR(field) \ 6356ab0a202SJeff Mahoney static ssize_t btrfs_space_info_show_##field(struct kobject *kobj, \ 6366ab0a202SJeff Mahoney struct kobj_attribute *a, \ 6376ab0a202SJeff Mahoney char *buf) \ 6386ab0a202SJeff Mahoney { \ 6396ab0a202SJeff Mahoney struct btrfs_space_info *sinfo = to_space_info(kobj); \ 6406ab0a202SJeff Mahoney return btrfs_show_u64(&sinfo->field, &sinfo->lock, buf); \ 6416ab0a202SJeff Mahoney } \ 642a969f4ccSHans van Kranenburg BTRFS_ATTR(space_info, field, btrfs_space_info_show_##field) 6436ab0a202SJeff Mahoney 6446ab0a202SJeff Mahoney static ssize_t btrfs_space_info_show_total_bytes_pinned(struct kobject *kobj, 6456ab0a202SJeff Mahoney struct kobj_attribute *a, 6466ab0a202SJeff Mahoney char *buf) 6476ab0a202SJeff Mahoney { 6486ab0a202SJeff Mahoney struct btrfs_space_info *sinfo = to_space_info(kobj); 6496ab0a202SJeff Mahoney s64 val = percpu_counter_sum(&sinfo->total_bytes_pinned); 650abdd9febSTakashi Iwai return scnprintf(buf, PAGE_SIZE, "%lld\n", val); 6516ab0a202SJeff Mahoney } 6526ab0a202SJeff Mahoney 6536ab0a202SJeff Mahoney SPACE_INFO_ATTR(flags); 6546ab0a202SJeff Mahoney SPACE_INFO_ATTR(total_bytes); 6556ab0a202SJeff Mahoney SPACE_INFO_ATTR(bytes_used); 6566ab0a202SJeff Mahoney SPACE_INFO_ATTR(bytes_pinned); 6576ab0a202SJeff Mahoney SPACE_INFO_ATTR(bytes_reserved); 6586ab0a202SJeff Mahoney SPACE_INFO_ATTR(bytes_may_use); 659c1fd5c30SWang Xiaoguang SPACE_INFO_ATTR(bytes_readonly); 6606ab0a202SJeff Mahoney SPACE_INFO_ATTR(disk_used); 6616ab0a202SJeff Mahoney SPACE_INFO_ATTR(disk_total); 662a969f4ccSHans van Kranenburg BTRFS_ATTR(space_info, total_bytes_pinned, 663a969f4ccSHans van Kranenburg btrfs_space_info_show_total_bytes_pinned); 6646ab0a202SJeff Mahoney 6656ab0a202SJeff Mahoney static struct attribute *space_info_attrs[] = { 666a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, flags), 667a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, total_bytes), 668a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, bytes_used), 669a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, bytes_pinned), 670a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, bytes_reserved), 671a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, bytes_may_use), 672a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, bytes_readonly), 673a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, disk_used), 674a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, disk_total), 675a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, total_bytes_pinned), 6766ab0a202SJeff Mahoney NULL, 6776ab0a202SJeff Mahoney }; 6787c7e3014SKimberly Brown ATTRIBUTE_GROUPS(space_info); 6796ab0a202SJeff Mahoney 6806ab0a202SJeff Mahoney static void space_info_release(struct kobject *kobj) 6816ab0a202SJeff Mahoney { 6826ab0a202SJeff Mahoney struct btrfs_space_info *sinfo = to_space_info(kobj); 6836ab0a202SJeff Mahoney percpu_counter_destroy(&sinfo->total_bytes_pinned); 6846ab0a202SJeff Mahoney kfree(sinfo); 6856ab0a202SJeff Mahoney } 6866ab0a202SJeff Mahoney 68727992d01SDavid Sterba static struct kobj_type space_info_ktype = { 6886ab0a202SJeff Mahoney .sysfs_ops = &kobj_sysfs_ops, 6896ab0a202SJeff Mahoney .release = space_info_release, 6907c7e3014SKimberly Brown .default_groups = space_info_groups, 6916ab0a202SJeff Mahoney }; 6926ab0a202SJeff Mahoney 6936ab0a202SJeff Mahoney static const struct attribute *allocation_attrs[] = { 694a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(allocation, global_rsv_reserved), 695a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(allocation, global_rsv_size), 6966ab0a202SJeff Mahoney NULL, 6976ab0a202SJeff Mahoney }; 6986ab0a202SJeff Mahoney 699f8ba9c11SJeff Mahoney static ssize_t btrfs_label_show(struct kobject *kobj, 700f8ba9c11SJeff Mahoney struct kobj_attribute *a, char *buf) 701f8ba9c11SJeff Mahoney { 702f8ba9c11SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj); 70348fcc3ffSSatoru Takeuchi char *label = fs_info->super_copy->label; 704ee17fc80SDavid Sterba ssize_t ret; 705ee17fc80SDavid Sterba 706ee17fc80SDavid Sterba spin_lock(&fs_info->super_lock); 707abdd9febSTakashi Iwai ret = scnprintf(buf, PAGE_SIZE, label[0] ? "%s\n" : "%s", label); 708ee17fc80SDavid Sterba spin_unlock(&fs_info->super_lock); 709ee17fc80SDavid Sterba 710ee17fc80SDavid Sterba return ret; 711f8ba9c11SJeff Mahoney } 712f8ba9c11SJeff Mahoney 713f8ba9c11SJeff Mahoney static ssize_t btrfs_label_store(struct kobject *kobj, 714f8ba9c11SJeff Mahoney struct kobj_attribute *a, 715f8ba9c11SJeff Mahoney const char *buf, size_t len) 716f8ba9c11SJeff Mahoney { 717f8ba9c11SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj); 71848fcc3ffSSatoru Takeuchi size_t p_len; 719f8ba9c11SJeff Mahoney 72066ac9fe7SDavid Sterba if (!fs_info) 72166ac9fe7SDavid Sterba return -EPERM; 72266ac9fe7SDavid Sterba 723bc98a42cSDavid Howells if (sb_rdonly(fs_info->sb)) 72479aec2b8SAnand Jain return -EROFS; 72579aec2b8SAnand Jain 72648fcc3ffSSatoru Takeuchi /* 72748fcc3ffSSatoru Takeuchi * p_len is the len until the first occurrence of either 72848fcc3ffSSatoru Takeuchi * '\n' or '\0' 72948fcc3ffSSatoru Takeuchi */ 73048fcc3ffSSatoru Takeuchi p_len = strcspn(buf, "\n"); 73148fcc3ffSSatoru Takeuchi 73248fcc3ffSSatoru Takeuchi if (p_len >= BTRFS_LABEL_SIZE) 733f8ba9c11SJeff Mahoney return -EINVAL; 734f8ba9c11SJeff Mahoney 735a6f69dc8SDavid Sterba spin_lock(&fs_info->super_lock); 73648fcc3ffSSatoru Takeuchi memset(fs_info->super_copy->label, 0, BTRFS_LABEL_SIZE); 73748fcc3ffSSatoru Takeuchi memcpy(fs_info->super_copy->label, buf, p_len); 738a6f69dc8SDavid Sterba spin_unlock(&fs_info->super_lock); 739f8ba9c11SJeff Mahoney 740a6f69dc8SDavid Sterba /* 741a6f69dc8SDavid Sterba * We don't want to do full transaction commit from inside sysfs 742a6f69dc8SDavid Sterba */ 743a6f69dc8SDavid Sterba btrfs_set_pending(fs_info, COMMIT); 744a6f69dc8SDavid Sterba wake_up_process(fs_info->transaction_kthread); 745a6f69dc8SDavid Sterba 746f8ba9c11SJeff Mahoney return len; 747f8ba9c11SJeff Mahoney } 748a969f4ccSHans van Kranenburg BTRFS_ATTR_RW(, label, btrfs_label_show, btrfs_label_store); 749f8ba9c11SJeff Mahoney 750df93589aSDavid Sterba static ssize_t btrfs_nodesize_show(struct kobject *kobj, 751df93589aSDavid Sterba struct kobj_attribute *a, char *buf) 752df93589aSDavid Sterba { 753df93589aSDavid Sterba struct btrfs_fs_info *fs_info = to_fs_info(kobj); 754df93589aSDavid Sterba 755abdd9febSTakashi Iwai return scnprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->nodesize); 756df93589aSDavid Sterba } 757df93589aSDavid Sterba 758a969f4ccSHans van Kranenburg BTRFS_ATTR(, nodesize, btrfs_nodesize_show); 759df93589aSDavid Sterba 760df93589aSDavid Sterba static ssize_t btrfs_sectorsize_show(struct kobject *kobj, 761df93589aSDavid Sterba struct kobj_attribute *a, char *buf) 762df93589aSDavid Sterba { 763df93589aSDavid Sterba struct btrfs_fs_info *fs_info = to_fs_info(kobj); 764df93589aSDavid Sterba 765abdd9febSTakashi Iwai return scnprintf(buf, PAGE_SIZE, "%u\n", 766093e037cSDavid Sterba fs_info->super_copy->sectorsize); 767df93589aSDavid Sterba } 768df93589aSDavid Sterba 769a969f4ccSHans van Kranenburg BTRFS_ATTR(, sectorsize, btrfs_sectorsize_show); 770df93589aSDavid Sterba 771df93589aSDavid Sterba static ssize_t btrfs_clone_alignment_show(struct kobject *kobj, 772df93589aSDavid Sterba struct kobj_attribute *a, char *buf) 773df93589aSDavid Sterba { 774df93589aSDavid Sterba struct btrfs_fs_info *fs_info = to_fs_info(kobj); 775df93589aSDavid Sterba 776abdd9febSTakashi Iwai return scnprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->sectorsize); 777df93589aSDavid Sterba } 778df93589aSDavid Sterba 779a969f4ccSHans van Kranenburg BTRFS_ATTR(, clone_alignment, btrfs_clone_alignment_show); 780df93589aSDavid Sterba 7812723480aSSargun Dhillon static ssize_t quota_override_show(struct kobject *kobj, 7822723480aSSargun Dhillon struct kobj_attribute *a, char *buf) 7832723480aSSargun Dhillon { 7842723480aSSargun Dhillon struct btrfs_fs_info *fs_info = to_fs_info(kobj); 7852723480aSSargun Dhillon int quota_override; 7862723480aSSargun Dhillon 7872723480aSSargun Dhillon quota_override = test_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags); 788abdd9febSTakashi Iwai return scnprintf(buf, PAGE_SIZE, "%d\n", quota_override); 7892723480aSSargun Dhillon } 7902723480aSSargun Dhillon 7912723480aSSargun Dhillon static ssize_t quota_override_store(struct kobject *kobj, 7922723480aSSargun Dhillon struct kobj_attribute *a, 7932723480aSSargun Dhillon const char *buf, size_t len) 7942723480aSSargun Dhillon { 7952723480aSSargun Dhillon struct btrfs_fs_info *fs_info = to_fs_info(kobj); 7962723480aSSargun Dhillon unsigned long knob; 7972723480aSSargun Dhillon int err; 7982723480aSSargun Dhillon 7992723480aSSargun Dhillon if (!fs_info) 8002723480aSSargun Dhillon return -EPERM; 8012723480aSSargun Dhillon 8022723480aSSargun Dhillon if (!capable(CAP_SYS_RESOURCE)) 8032723480aSSargun Dhillon return -EPERM; 8042723480aSSargun Dhillon 8052723480aSSargun Dhillon err = kstrtoul(buf, 10, &knob); 8062723480aSSargun Dhillon if (err) 8072723480aSSargun Dhillon return err; 8082723480aSSargun Dhillon if (knob > 1) 8092723480aSSargun Dhillon return -EINVAL; 8102723480aSSargun Dhillon 8112723480aSSargun Dhillon if (knob) 8122723480aSSargun Dhillon set_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags); 8132723480aSSargun Dhillon else 8142723480aSSargun Dhillon clear_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags); 8152723480aSSargun Dhillon 8162723480aSSargun Dhillon return len; 8172723480aSSargun Dhillon } 8182723480aSSargun Dhillon 819a969f4ccSHans van Kranenburg BTRFS_ATTR_RW(, quota_override, quota_override_show, quota_override_store); 8202723480aSSargun Dhillon 82156f20f40SNikolay Borisov static ssize_t btrfs_metadata_uuid_show(struct kobject *kobj, 82256f20f40SNikolay Borisov struct kobj_attribute *a, char *buf) 82356f20f40SNikolay Borisov { 82456f20f40SNikolay Borisov struct btrfs_fs_info *fs_info = to_fs_info(kobj); 82556f20f40SNikolay Borisov 826abdd9febSTakashi Iwai return scnprintf(buf, PAGE_SIZE, "%pU\n", 82756f20f40SNikolay Borisov fs_info->fs_devices->metadata_uuid); 82856f20f40SNikolay Borisov } 82956f20f40SNikolay Borisov 83056f20f40SNikolay Borisov BTRFS_ATTR(, metadata_uuid, btrfs_metadata_uuid_show); 83156f20f40SNikolay Borisov 83241e6d2a8SJohannes Thumshirn static ssize_t btrfs_checksum_show(struct kobject *kobj, 83341e6d2a8SJohannes Thumshirn struct kobj_attribute *a, char *buf) 83441e6d2a8SJohannes Thumshirn { 83541e6d2a8SJohannes Thumshirn struct btrfs_fs_info *fs_info = to_fs_info(kobj); 83641e6d2a8SJohannes Thumshirn u16 csum_type = btrfs_super_csum_type(fs_info->super_copy); 83741e6d2a8SJohannes Thumshirn 838abdd9febSTakashi Iwai return scnprintf(buf, PAGE_SIZE, "%s (%s)\n", 83941e6d2a8SJohannes Thumshirn btrfs_super_csum_name(csum_type), 84041e6d2a8SJohannes Thumshirn crypto_shash_driver_name(fs_info->csum_shash)); 84141e6d2a8SJohannes Thumshirn } 84241e6d2a8SJohannes Thumshirn 84341e6d2a8SJohannes Thumshirn BTRFS_ATTR(, checksum, btrfs_checksum_show); 84441e6d2a8SJohannes Thumshirn 84566a2823cSGoldwyn Rodrigues static ssize_t btrfs_exclusive_operation_show(struct kobject *kobj, 84666a2823cSGoldwyn Rodrigues struct kobj_attribute *a, char *buf) 84766a2823cSGoldwyn Rodrigues { 84866a2823cSGoldwyn Rodrigues struct btrfs_fs_info *fs_info = to_fs_info(kobj); 84966a2823cSGoldwyn Rodrigues const char *str; 85066a2823cSGoldwyn Rodrigues 85166a2823cSGoldwyn Rodrigues switch (READ_ONCE(fs_info->exclusive_operation)) { 85266a2823cSGoldwyn Rodrigues case BTRFS_EXCLOP_NONE: 85366a2823cSGoldwyn Rodrigues str = "none\n"; 85466a2823cSGoldwyn Rodrigues break; 85566a2823cSGoldwyn Rodrigues case BTRFS_EXCLOP_BALANCE: 85666a2823cSGoldwyn Rodrigues str = "balance\n"; 85766a2823cSGoldwyn Rodrigues break; 85866a2823cSGoldwyn Rodrigues case BTRFS_EXCLOP_DEV_ADD: 85966a2823cSGoldwyn Rodrigues str = "device add\n"; 86066a2823cSGoldwyn Rodrigues break; 86166a2823cSGoldwyn Rodrigues case BTRFS_EXCLOP_DEV_REMOVE: 86266a2823cSGoldwyn Rodrigues str = "device remove\n"; 86366a2823cSGoldwyn Rodrigues break; 86466a2823cSGoldwyn Rodrigues case BTRFS_EXCLOP_DEV_REPLACE: 86566a2823cSGoldwyn Rodrigues str = "device replace\n"; 86666a2823cSGoldwyn Rodrigues break; 86766a2823cSGoldwyn Rodrigues case BTRFS_EXCLOP_RESIZE: 86866a2823cSGoldwyn Rodrigues str = "resize\n"; 86966a2823cSGoldwyn Rodrigues break; 87066a2823cSGoldwyn Rodrigues case BTRFS_EXCLOP_SWAP_ACTIVATE: 87166a2823cSGoldwyn Rodrigues str = "swap activate\n"; 87266a2823cSGoldwyn Rodrigues break; 87366a2823cSGoldwyn Rodrigues default: 87466a2823cSGoldwyn Rodrigues str = "UNKNOWN\n"; 87566a2823cSGoldwyn Rodrigues break; 87666a2823cSGoldwyn Rodrigues } 87766a2823cSGoldwyn Rodrigues return scnprintf(buf, PAGE_SIZE, "%s", str); 87866a2823cSGoldwyn Rodrigues } 87966a2823cSGoldwyn Rodrigues BTRFS_ATTR(, exclusive_operation, btrfs_exclusive_operation_show); 88066a2823cSGoldwyn Rodrigues 881089c8b05SAnand Jain static ssize_t btrfs_generation_show(struct kobject *kobj, 882089c8b05SAnand Jain struct kobj_attribute *a, char *buf) 883089c8b05SAnand Jain { 884089c8b05SAnand Jain struct btrfs_fs_info *fs_info = to_fs_info(kobj); 885089c8b05SAnand Jain 886089c8b05SAnand Jain return scnprintf(buf, PAGE_SIZE, "%llu\n", fs_info->generation); 887089c8b05SAnand Jain } 888089c8b05SAnand Jain BTRFS_ATTR(, generation, btrfs_generation_show); 889089c8b05SAnand Jain 8900dd2906fSAnand Jain static const struct attribute *btrfs_attrs[] = { 891a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(, label), 892a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(, nodesize), 893a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(, sectorsize), 894a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(, clone_alignment), 895a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(, quota_override), 89656f20f40SNikolay Borisov BTRFS_ATTR_PTR(, metadata_uuid), 89741e6d2a8SJohannes Thumshirn BTRFS_ATTR_PTR(, checksum), 89866a2823cSGoldwyn Rodrigues BTRFS_ATTR_PTR(, exclusive_operation), 899089c8b05SAnand Jain BTRFS_ATTR_PTR(, generation), 900f8ba9c11SJeff Mahoney NULL, 901f8ba9c11SJeff Mahoney }; 902f8ba9c11SJeff Mahoney 903c1b7e474SAnand Jain static void btrfs_release_fsid_kobj(struct kobject *kobj) 904510d7360SJeff Mahoney { 9052e7910d6SAnand Jain struct btrfs_fs_devices *fs_devs = to_fs_devs(kobj); 906248d200dSAnand Jain 907c1b7e474SAnand Jain memset(&fs_devs->fsid_kobj, 0, sizeof(struct kobject)); 9082e7910d6SAnand Jain complete(&fs_devs->kobj_unregister); 909510d7360SJeff Mahoney } 910510d7360SJeff Mahoney 911510d7360SJeff Mahoney static struct kobj_type btrfs_ktype = { 912510d7360SJeff Mahoney .sysfs_ops = &kobj_sysfs_ops, 913c1b7e474SAnand Jain .release = btrfs_release_fsid_kobj, 914510d7360SJeff Mahoney }; 915510d7360SJeff Mahoney 9162e7910d6SAnand Jain static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj) 9172e7910d6SAnand Jain { 9182e7910d6SAnand Jain if (kobj->ktype != &btrfs_ktype) 9192e7910d6SAnand Jain return NULL; 920c1b7e474SAnand Jain return container_of(kobj, struct btrfs_fs_devices, fsid_kobj); 9212e7910d6SAnand Jain } 9222e7910d6SAnand Jain 923510d7360SJeff Mahoney static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj) 924510d7360SJeff Mahoney { 925510d7360SJeff Mahoney if (kobj->ktype != &btrfs_ktype) 926510d7360SJeff Mahoney return NULL; 9272e7910d6SAnand Jain return to_fs_devs(kobj)->fs_info; 928510d7360SJeff Mahoney } 92958176a96SJosef Bacik 930e453d989SJeff Mahoney #define NUM_FEATURE_BITS 64 9316c52157fSTomohiro Misono #define BTRFS_FEATURE_NAME_MAX 13 9326c52157fSTomohiro Misono static char btrfs_unknown_feature_names[FEAT_MAX][NUM_FEATURE_BITS][BTRFS_FEATURE_NAME_MAX]; 9336c52157fSTomohiro Misono static struct btrfs_feature_attr btrfs_feature_attrs[FEAT_MAX][NUM_FEATURE_BITS]; 934e453d989SJeff Mahoney 9356c52157fSTomohiro Misono static const u64 supported_feature_masks[FEAT_MAX] = { 936e453d989SJeff Mahoney [FEAT_COMPAT] = BTRFS_FEATURE_COMPAT_SUPP, 937e453d989SJeff Mahoney [FEAT_COMPAT_RO] = BTRFS_FEATURE_COMPAT_RO_SUPP, 938e453d989SJeff Mahoney [FEAT_INCOMPAT] = BTRFS_FEATURE_INCOMPAT_SUPP, 939e453d989SJeff Mahoney }; 940e453d989SJeff Mahoney 941e453d989SJeff Mahoney static int addrm_unknown_feature_attrs(struct btrfs_fs_info *fs_info, bool add) 9425ac1d209SJeff Mahoney { 943e453d989SJeff Mahoney int set; 944e453d989SJeff Mahoney 945e453d989SJeff Mahoney for (set = 0; set < FEAT_MAX; set++) { 946e453d989SJeff Mahoney int i; 947e453d989SJeff Mahoney struct attribute *attrs[2]; 948e453d989SJeff Mahoney struct attribute_group agroup = { 949e453d989SJeff Mahoney .name = "features", 950e453d989SJeff Mahoney .attrs = attrs, 951e453d989SJeff Mahoney }; 952e453d989SJeff Mahoney u64 features = get_features(fs_info, set); 953e453d989SJeff Mahoney features &= ~supported_feature_masks[set]; 954e453d989SJeff Mahoney 955e453d989SJeff Mahoney if (!features) 956e453d989SJeff Mahoney continue; 957e453d989SJeff Mahoney 958e453d989SJeff Mahoney attrs[1] = NULL; 959e453d989SJeff Mahoney for (i = 0; i < NUM_FEATURE_BITS; i++) { 960e453d989SJeff Mahoney struct btrfs_feature_attr *fa; 961e453d989SJeff Mahoney 962e453d989SJeff Mahoney if (!(features & (1ULL << i))) 963e453d989SJeff Mahoney continue; 964e453d989SJeff Mahoney 965e453d989SJeff Mahoney fa = &btrfs_feature_attrs[set][i]; 966e453d989SJeff Mahoney attrs[0] = &fa->kobj_attr.attr; 967e453d989SJeff Mahoney if (add) { 968e453d989SJeff Mahoney int ret; 969c1b7e474SAnand Jain ret = sysfs_merge_group(&fs_info->fs_devices->fsid_kobj, 970e453d989SJeff Mahoney &agroup); 971e453d989SJeff Mahoney if (ret) 972e453d989SJeff Mahoney return ret; 973e453d989SJeff Mahoney } else 974c1b7e474SAnand Jain sysfs_unmerge_group(&fs_info->fs_devices->fsid_kobj, 975e453d989SJeff Mahoney &agroup); 976e453d989SJeff Mahoney } 977e453d989SJeff Mahoney 978e453d989SJeff Mahoney } 979e453d989SJeff Mahoney return 0; 980e453d989SJeff Mahoney } 981e453d989SJeff Mahoney 9822e3e1281SAnand Jain static void __btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs) 983e453d989SJeff Mahoney { 984a013d141SAnand Jain if (fs_devs->devinfo_kobj) { 985a013d141SAnand Jain kobject_del(fs_devs->devinfo_kobj); 986a013d141SAnand Jain kobject_put(fs_devs->devinfo_kobj); 987a013d141SAnand Jain fs_devs->devinfo_kobj = NULL; 988a013d141SAnand Jain } 989a013d141SAnand Jain 990b5501504SAnand Jain if (fs_devs->devices_kobj) { 991b5501504SAnand Jain kobject_del(fs_devs->devices_kobj); 992b5501504SAnand Jain kobject_put(fs_devs->devices_kobj); 993b5501504SAnand Jain fs_devs->devices_kobj = NULL; 994aaf13305SAnand Jain } 995aaf13305SAnand Jain 996c1b7e474SAnand Jain if (fs_devs->fsid_kobj.state_initialized) { 997c1b7e474SAnand Jain kobject_del(&fs_devs->fsid_kobj); 998c1b7e474SAnand Jain kobject_put(&fs_devs->fsid_kobj); 9992e7910d6SAnand Jain wait_for_completion(&fs_devs->kobj_unregister); 10005ac1d209SJeff Mahoney } 1001f90fc547SAnand Jain } 10025ac1d209SJeff Mahoney 10032e3e1281SAnand Jain /* when fs_devs is NULL it will remove all fsid kobject */ 10041d1c1be3SAnand Jain void btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs) 10052e3e1281SAnand Jain { 10062e3e1281SAnand Jain struct list_head *fs_uuids = btrfs_get_fs_uuids(); 10072e3e1281SAnand Jain 10082e3e1281SAnand Jain if (fs_devs) { 10092e3e1281SAnand Jain __btrfs_sysfs_remove_fsid(fs_devs); 10102e3e1281SAnand Jain return; 10112e3e1281SAnand Jain } 10122e3e1281SAnand Jain 1013c4babc5eSAnand Jain list_for_each_entry(fs_devs, fs_uuids, fs_list) { 10142e3e1281SAnand Jain __btrfs_sysfs_remove_fsid(fs_devs); 10152e3e1281SAnand Jain } 10162e3e1281SAnand Jain } 10172e3e1281SAnand Jain 101853f8a74cSAnand Jain static void btrfs_sysfs_remove_fs_devices(struct btrfs_fs_devices *fs_devices) 101953f8a74cSAnand Jain { 102053f8a74cSAnand Jain struct btrfs_device *device; 102130b0e4e0SAnand Jain struct btrfs_fs_devices *seed; 102253f8a74cSAnand Jain 102353f8a74cSAnand Jain list_for_each_entry(device, &fs_devices->devices, dev_list) 102453f8a74cSAnand Jain btrfs_sysfs_remove_device(device); 102530b0e4e0SAnand Jain 102630b0e4e0SAnand Jain list_for_each_entry(seed, &fs_devices->seed_list, seed_list) { 102730b0e4e0SAnand Jain list_for_each_entry(device, &seed->devices, dev_list) 102830b0e4e0SAnand Jain btrfs_sysfs_remove_device(device); 102930b0e4e0SAnand Jain } 103053f8a74cSAnand Jain } 103153f8a74cSAnand Jain 10326618a59bSAnand Jain void btrfs_sysfs_remove_mounted(struct btrfs_fs_info *fs_info) 1033e453d989SJeff Mahoney { 10343092c68fSNikolay Borisov struct kobject *fsid_kobj = &fs_info->fs_devices->fsid_kobj; 10353092c68fSNikolay Borisov 10363092c68fSNikolay Borisov sysfs_remove_link(fsid_kobj, "bdi"); 10373092c68fSNikolay Borisov 1038e453d989SJeff Mahoney if (fs_info->space_info_kobj) { 1039e453d989SJeff Mahoney sysfs_remove_files(fs_info->space_info_kobj, allocation_attrs); 1040e453d989SJeff Mahoney kobject_del(fs_info->space_info_kobj); 1041e453d989SJeff Mahoney kobject_put(fs_info->space_info_kobj); 1042e453d989SJeff Mahoney } 104371e8978eSDennis Zhou #ifdef CONFIG_BTRFS_DEBUG 1044e4faab84SDennis Zhou if (fs_info->discard_debug_kobj) { 1045e4faab84SDennis Zhou sysfs_remove_files(fs_info->discard_debug_kobj, 1046e4faab84SDennis Zhou discard_debug_attrs); 1047e4faab84SDennis Zhou kobject_del(fs_info->discard_debug_kobj); 1048e4faab84SDennis Zhou kobject_put(fs_info->discard_debug_kobj); 1049e4faab84SDennis Zhou } 105093945cb4SDennis Zhou if (fs_info->debug_kobj) { 105193945cb4SDennis Zhou sysfs_remove_files(fs_info->debug_kobj, btrfs_debug_mount_attrs); 105293945cb4SDennis Zhou kobject_del(fs_info->debug_kobj); 105393945cb4SDennis Zhou kobject_put(fs_info->debug_kobj); 105493945cb4SDennis Zhou } 105571e8978eSDennis Zhou #endif 1056e453d989SJeff Mahoney addrm_unknown_feature_attrs(fs_info, false); 10573092c68fSNikolay Borisov sysfs_remove_group(fsid_kobj, &btrfs_feature_attr_group); 10583092c68fSNikolay Borisov sysfs_remove_files(fsid_kobj, btrfs_attrs); 105953f8a74cSAnand Jain btrfs_sysfs_remove_fs_devices(fs_info->fs_devices); 1060e453d989SJeff Mahoney } 1061e453d989SJeff Mahoney 1062f10152bcSDavid Sterba static const char * const btrfs_feature_set_names[FEAT_MAX] = { 106379da4fa4SJeff Mahoney [FEAT_COMPAT] = "compat", 106479da4fa4SJeff Mahoney [FEAT_COMPAT_RO] = "compat_ro", 106579da4fa4SJeff Mahoney [FEAT_INCOMPAT] = "incompat", 106679da4fa4SJeff Mahoney }; 106779da4fa4SJeff Mahoney 10689e6df7ceSDavid Sterba const char *btrfs_feature_set_name(enum btrfs_feature_set set) 1069f10152bcSDavid Sterba { 1070f10152bcSDavid Sterba return btrfs_feature_set_names[set]; 1071f10152bcSDavid Sterba } 1072f10152bcSDavid Sterba 10733b02a68aSJeff Mahoney char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags) 10743b02a68aSJeff Mahoney { 10753b02a68aSJeff Mahoney size_t bufsize = 4096; /* safe max, 64 names * 64 bytes */ 10763b02a68aSJeff Mahoney int len = 0; 10773b02a68aSJeff Mahoney int i; 10783b02a68aSJeff Mahoney char *str; 10793b02a68aSJeff Mahoney 10803b02a68aSJeff Mahoney str = kmalloc(bufsize, GFP_KERNEL); 10813b02a68aSJeff Mahoney if (!str) 10823b02a68aSJeff Mahoney return str; 10833b02a68aSJeff Mahoney 10843b02a68aSJeff Mahoney for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { 10853b02a68aSJeff Mahoney const char *name; 10863b02a68aSJeff Mahoney 10873b02a68aSJeff Mahoney if (!(flags & (1ULL << i))) 10883b02a68aSJeff Mahoney continue; 10893b02a68aSJeff Mahoney 10903b02a68aSJeff Mahoney name = btrfs_feature_attrs[set][i].kobj_attr.attr.name; 1091abdd9febSTakashi Iwai len += scnprintf(str + len, bufsize - len, "%s%s", 10923b02a68aSJeff Mahoney len ? "," : "", name); 10933b02a68aSJeff Mahoney } 10943b02a68aSJeff Mahoney 10953b02a68aSJeff Mahoney return str; 10963b02a68aSJeff Mahoney } 10973b02a68aSJeff Mahoney 109879da4fa4SJeff Mahoney static void init_feature_attrs(void) 109979da4fa4SJeff Mahoney { 110079da4fa4SJeff Mahoney struct btrfs_feature_attr *fa; 110179da4fa4SJeff Mahoney int set, i; 110279da4fa4SJeff Mahoney 110379da4fa4SJeff Mahoney BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names) != 110479da4fa4SJeff Mahoney ARRAY_SIZE(btrfs_feature_attrs)); 110579da4fa4SJeff Mahoney BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names[0]) != 110679da4fa4SJeff Mahoney ARRAY_SIZE(btrfs_feature_attrs[0])); 110779da4fa4SJeff Mahoney 11083b02a68aSJeff Mahoney memset(btrfs_feature_attrs, 0, sizeof(btrfs_feature_attrs)); 11093b02a68aSJeff Mahoney memset(btrfs_unknown_feature_names, 0, 11103b02a68aSJeff Mahoney sizeof(btrfs_unknown_feature_names)); 11113b02a68aSJeff Mahoney 111279da4fa4SJeff Mahoney for (i = 0; btrfs_supported_feature_attrs[i]; i++) { 111379da4fa4SJeff Mahoney struct btrfs_feature_attr *sfa; 111479da4fa4SJeff Mahoney struct attribute *a = btrfs_supported_feature_attrs[i]; 11153b02a68aSJeff Mahoney int bit; 111679da4fa4SJeff Mahoney sfa = attr_to_btrfs_feature_attr(a); 11173b02a68aSJeff Mahoney bit = ilog2(sfa->feature_bit); 11183b02a68aSJeff Mahoney fa = &btrfs_feature_attrs[sfa->feature_set][bit]; 111979da4fa4SJeff Mahoney 112079da4fa4SJeff Mahoney fa->kobj_attr.attr.name = sfa->kobj_attr.attr.name; 112179da4fa4SJeff Mahoney } 112279da4fa4SJeff Mahoney 112379da4fa4SJeff Mahoney for (set = 0; set < FEAT_MAX; set++) { 112479da4fa4SJeff Mahoney for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { 112579da4fa4SJeff Mahoney char *name = btrfs_unknown_feature_names[set][i]; 112679da4fa4SJeff Mahoney fa = &btrfs_feature_attrs[set][i]; 112779da4fa4SJeff Mahoney 112879da4fa4SJeff Mahoney if (fa->kobj_attr.attr.name) 112979da4fa4SJeff Mahoney continue; 113079da4fa4SJeff Mahoney 11316c52157fSTomohiro Misono snprintf(name, BTRFS_FEATURE_NAME_MAX, "%s:%u", 113279da4fa4SJeff Mahoney btrfs_feature_set_names[set], i); 113379da4fa4SJeff Mahoney 113479da4fa4SJeff Mahoney fa->kobj_attr.attr.name = name; 113579da4fa4SJeff Mahoney fa->kobj_attr.attr.mode = S_IRUGO; 113679da4fa4SJeff Mahoney fa->feature_set = set; 113779da4fa4SJeff Mahoney fa->feature_bit = 1ULL << i; 113879da4fa4SJeff Mahoney } 113979da4fa4SJeff Mahoney } 114079da4fa4SJeff Mahoney } 114179da4fa4SJeff Mahoney 114232a9991fSDavid Sterba /* 114332a9991fSDavid Sterba * Create a sysfs entry for a given block group type at path 114432a9991fSDavid Sterba * /sys/fs/btrfs/UUID/allocation/data/TYPE 114532a9991fSDavid Sterba */ 114632da5386SDavid Sterba void btrfs_sysfs_add_block_group_type(struct btrfs_block_group *cache) 114732a9991fSDavid Sterba { 114832a9991fSDavid Sterba struct btrfs_fs_info *fs_info = cache->fs_info; 114932a9991fSDavid Sterba struct btrfs_space_info *space_info = cache->space_info; 115032a9991fSDavid Sterba struct raid_kobject *rkobj; 115132a9991fSDavid Sterba const int index = btrfs_bg_flags_to_raid_index(cache->flags); 115232a9991fSDavid Sterba unsigned int nofs_flag; 115332a9991fSDavid Sterba int ret; 115432a9991fSDavid Sterba 115532a9991fSDavid Sterba /* 115632a9991fSDavid Sterba * Setup a NOFS context because kobject_add(), deep in its call chain, 115732a9991fSDavid Sterba * does GFP_KERNEL allocations, and we are often called in a context 115832a9991fSDavid Sterba * where if reclaim is triggered we can deadlock (we are either holding 115932a9991fSDavid Sterba * a transaction handle or some lock required for a transaction 116032a9991fSDavid Sterba * commit). 116132a9991fSDavid Sterba */ 116232a9991fSDavid Sterba nofs_flag = memalloc_nofs_save(); 116332a9991fSDavid Sterba 116432a9991fSDavid Sterba rkobj = kzalloc(sizeof(*rkobj), GFP_NOFS); 116532a9991fSDavid Sterba if (!rkobj) { 116632a9991fSDavid Sterba memalloc_nofs_restore(nofs_flag); 116732a9991fSDavid Sterba btrfs_warn(cache->fs_info, 116832a9991fSDavid Sterba "couldn't alloc memory for raid level kobject"); 116932a9991fSDavid Sterba return; 117032a9991fSDavid Sterba } 117132a9991fSDavid Sterba 117232a9991fSDavid Sterba rkobj->flags = cache->flags; 117332a9991fSDavid Sterba kobject_init(&rkobj->kobj, &btrfs_raid_ktype); 117449ea112dSJosef Bacik 117549ea112dSJosef Bacik /* 117649ea112dSJosef Bacik * We call this either on mount, or if we've created a block group for a 117749ea112dSJosef Bacik * new index type while running (i.e. when restriping). The running 117849ea112dSJosef Bacik * case is tricky because we could race with other threads, so we need 117949ea112dSJosef Bacik * to have this check to make sure we didn't already init the kobject. 118049ea112dSJosef Bacik * 118149ea112dSJosef Bacik * We don't have to protect on the free side because it only happens on 118249ea112dSJosef Bacik * unmount. 118349ea112dSJosef Bacik */ 118449ea112dSJosef Bacik spin_lock(&space_info->lock); 118549ea112dSJosef Bacik if (space_info->block_group_kobjs[index]) { 118649ea112dSJosef Bacik spin_unlock(&space_info->lock); 118749ea112dSJosef Bacik kobject_put(&rkobj->kobj); 118849ea112dSJosef Bacik return; 118949ea112dSJosef Bacik } else { 119049ea112dSJosef Bacik space_info->block_group_kobjs[index] = &rkobj->kobj; 119149ea112dSJosef Bacik } 119249ea112dSJosef Bacik spin_unlock(&space_info->lock); 119349ea112dSJosef Bacik 119432a9991fSDavid Sterba ret = kobject_add(&rkobj->kobj, &space_info->kobj, "%s", 119532a9991fSDavid Sterba btrfs_bg_type_to_raid_name(rkobj->flags)); 119632a9991fSDavid Sterba memalloc_nofs_restore(nofs_flag); 119732a9991fSDavid Sterba if (ret) { 119849ea112dSJosef Bacik spin_lock(&space_info->lock); 119949ea112dSJosef Bacik space_info->block_group_kobjs[index] = NULL; 120049ea112dSJosef Bacik spin_unlock(&space_info->lock); 120132a9991fSDavid Sterba kobject_put(&rkobj->kobj); 120232a9991fSDavid Sterba btrfs_warn(fs_info, 120332a9991fSDavid Sterba "failed to add kobject for block cache, ignoring"); 120432a9991fSDavid Sterba return; 120532a9991fSDavid Sterba } 120632a9991fSDavid Sterba } 120732a9991fSDavid Sterba 1208b5865babSDavid Sterba /* 1209b5865babSDavid Sterba * Remove sysfs directories for all block group types of a given space info and 1210b5865babSDavid Sterba * the space info as well 1211b5865babSDavid Sterba */ 1212b5865babSDavid Sterba void btrfs_sysfs_remove_space_info(struct btrfs_space_info *space_info) 1213b5865babSDavid Sterba { 1214b5865babSDavid Sterba int i; 1215b5865babSDavid Sterba 1216b5865babSDavid Sterba for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) { 1217b5865babSDavid Sterba struct kobject *kobj; 1218b5865babSDavid Sterba 1219b5865babSDavid Sterba kobj = space_info->block_group_kobjs[i]; 1220b5865babSDavid Sterba space_info->block_group_kobjs[i] = NULL; 1221b5865babSDavid Sterba if (kobj) { 1222b5865babSDavid Sterba kobject_del(kobj); 1223b5865babSDavid Sterba kobject_put(kobj); 1224b5865babSDavid Sterba } 1225b5865babSDavid Sterba } 1226b5865babSDavid Sterba kobject_del(&space_info->kobj); 1227b5865babSDavid Sterba kobject_put(&space_info->kobj); 1228b5865babSDavid Sterba } 1229b5865babSDavid Sterba 1230b882327aSDavid Sterba static const char *alloc_name(u64 flags) 1231b882327aSDavid Sterba { 1232b882327aSDavid Sterba switch (flags) { 1233b882327aSDavid Sterba case BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_DATA: 1234b882327aSDavid Sterba return "mixed"; 1235b882327aSDavid Sterba case BTRFS_BLOCK_GROUP_METADATA: 1236b882327aSDavid Sterba return "metadata"; 1237b882327aSDavid Sterba case BTRFS_BLOCK_GROUP_DATA: 1238b882327aSDavid Sterba return "data"; 1239b882327aSDavid Sterba case BTRFS_BLOCK_GROUP_SYSTEM: 1240b882327aSDavid Sterba return "system"; 1241b882327aSDavid Sterba default: 1242b882327aSDavid Sterba WARN_ON(1); 1243b882327aSDavid Sterba return "invalid-combination"; 1244b882327aSDavid Sterba }; 1245b882327aSDavid Sterba } 1246b882327aSDavid Sterba 1247b882327aSDavid Sterba /* 1248b882327aSDavid Sterba * Create a sysfs entry for a space info type at path 1249b882327aSDavid Sterba * /sys/fs/btrfs/UUID/allocation/TYPE 1250b882327aSDavid Sterba */ 1251b882327aSDavid Sterba int btrfs_sysfs_add_space_info_type(struct btrfs_fs_info *fs_info, 1252b882327aSDavid Sterba struct btrfs_space_info *space_info) 1253b882327aSDavid Sterba { 1254b882327aSDavid Sterba int ret; 1255b882327aSDavid Sterba 1256b882327aSDavid Sterba ret = kobject_init_and_add(&space_info->kobj, &space_info_ktype, 1257b882327aSDavid Sterba fs_info->space_info_kobj, "%s", 1258b882327aSDavid Sterba alloc_name(space_info->flags)); 1259b882327aSDavid Sterba if (ret) { 1260b882327aSDavid Sterba kobject_put(&space_info->kobj); 1261b882327aSDavid Sterba return ret; 1262b882327aSDavid Sterba } 1263b882327aSDavid Sterba 1264b882327aSDavid Sterba return 0; 1265b882327aSDavid Sterba } 1266b882327aSDavid Sterba 126753f8a74cSAnand Jain void btrfs_sysfs_remove_device(struct btrfs_device *device) 126899994cdeSAnand Jain { 126999994cdeSAnand Jain struct hd_struct *disk; 127099994cdeSAnand Jain struct kobject *disk_kobj; 1271985e233eSAnand Jain struct kobject *devices_kobj; 127299994cdeSAnand Jain 1273985e233eSAnand Jain /* 1274985e233eSAnand Jain * Seed fs_devices devices_kobj aren't used, fetch kobject from the 1275985e233eSAnand Jain * fs_info::fs_devices. 1276985e233eSAnand Jain */ 1277985e233eSAnand Jain devices_kobj = device->fs_info->fs_devices->devices_kobj; 1278985e233eSAnand Jain ASSERT(devices_kobj); 127999994cdeSAnand Jain 1280985e233eSAnand Jain if (device->bdev) { 1281985e233eSAnand Jain disk = device->bdev->bd_part; 128299994cdeSAnand Jain disk_kobj = &part_to_dev(disk)->kobj; 1283985e233eSAnand Jain sysfs_remove_link(devices_kobj, disk_kobj->name); 128499994cdeSAnand Jain } 128599994cdeSAnand Jain 1286985e233eSAnand Jain if (device->devid_kobj.state_initialized) { 1287985e233eSAnand Jain kobject_del(&device->devid_kobj); 1288985e233eSAnand Jain kobject_put(&device->devid_kobj); 1289985e233eSAnand Jain wait_for_completion(&device->kobj_unregister); 1290985e233eSAnand Jain } 1291b5ddcffaSAnand Jain } 1292668e48afSAnand Jain 1293668e48afSAnand Jain static ssize_t btrfs_devinfo_in_fs_metadata_show(struct kobject *kobj, 1294668e48afSAnand Jain struct kobj_attribute *a, 1295668e48afSAnand Jain char *buf) 1296668e48afSAnand Jain { 1297668e48afSAnand Jain int val; 1298668e48afSAnand Jain struct btrfs_device *device = container_of(kobj, struct btrfs_device, 1299668e48afSAnand Jain devid_kobj); 1300668e48afSAnand Jain 1301668e48afSAnand Jain val = !!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &device->dev_state); 1302668e48afSAnand Jain 1303abdd9febSTakashi Iwai return scnprintf(buf, PAGE_SIZE, "%d\n", val); 1304668e48afSAnand Jain } 1305668e48afSAnand Jain BTRFS_ATTR(devid, in_fs_metadata, btrfs_devinfo_in_fs_metadata_show); 1306668e48afSAnand Jain 130725864778SAnand Jain static ssize_t btrfs_devinfo_missing_show(struct kobject *kobj, 1308668e48afSAnand Jain struct kobj_attribute *a, char *buf) 1309668e48afSAnand Jain { 1310668e48afSAnand Jain int val; 1311668e48afSAnand Jain struct btrfs_device *device = container_of(kobj, struct btrfs_device, 1312668e48afSAnand Jain devid_kobj); 1313668e48afSAnand Jain 1314668e48afSAnand Jain val = !!test_bit(BTRFS_DEV_STATE_MISSING, &device->dev_state); 1315668e48afSAnand Jain 1316abdd9febSTakashi Iwai return scnprintf(buf, PAGE_SIZE, "%d\n", val); 1317668e48afSAnand Jain } 131825864778SAnand Jain BTRFS_ATTR(devid, missing, btrfs_devinfo_missing_show); 1319668e48afSAnand Jain 1320668e48afSAnand Jain static ssize_t btrfs_devinfo_replace_target_show(struct kobject *kobj, 1321668e48afSAnand Jain struct kobj_attribute *a, 1322668e48afSAnand Jain char *buf) 1323668e48afSAnand Jain { 1324668e48afSAnand Jain int val; 1325668e48afSAnand Jain struct btrfs_device *device = container_of(kobj, struct btrfs_device, 1326668e48afSAnand Jain devid_kobj); 1327668e48afSAnand Jain 1328668e48afSAnand Jain val = !!test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state); 1329668e48afSAnand Jain 1330abdd9febSTakashi Iwai return scnprintf(buf, PAGE_SIZE, "%d\n", val); 1331668e48afSAnand Jain } 1332668e48afSAnand Jain BTRFS_ATTR(devid, replace_target, btrfs_devinfo_replace_target_show); 1333668e48afSAnand Jain 1334668e48afSAnand Jain static ssize_t btrfs_devinfo_writeable_show(struct kobject *kobj, 1335668e48afSAnand Jain struct kobj_attribute *a, char *buf) 1336668e48afSAnand Jain { 1337668e48afSAnand Jain int val; 1338668e48afSAnand Jain struct btrfs_device *device = container_of(kobj, struct btrfs_device, 1339668e48afSAnand Jain devid_kobj); 1340668e48afSAnand Jain 1341668e48afSAnand Jain val = !!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state); 1342668e48afSAnand Jain 1343abdd9febSTakashi Iwai return scnprintf(buf, PAGE_SIZE, "%d\n", val); 1344668e48afSAnand Jain } 1345668e48afSAnand Jain BTRFS_ATTR(devid, writeable, btrfs_devinfo_writeable_show); 1346668e48afSAnand Jain 1347668e48afSAnand Jain static struct attribute *devid_attrs[] = { 1348668e48afSAnand Jain BTRFS_ATTR_PTR(devid, in_fs_metadata), 1349668e48afSAnand Jain BTRFS_ATTR_PTR(devid, missing), 1350668e48afSAnand Jain BTRFS_ATTR_PTR(devid, replace_target), 1351668e48afSAnand Jain BTRFS_ATTR_PTR(devid, writeable), 1352668e48afSAnand Jain NULL 1353668e48afSAnand Jain }; 1354668e48afSAnand Jain ATTRIBUTE_GROUPS(devid); 1355668e48afSAnand Jain 1356668e48afSAnand Jain static void btrfs_release_devid_kobj(struct kobject *kobj) 1357668e48afSAnand Jain { 1358668e48afSAnand Jain struct btrfs_device *device = container_of(kobj, struct btrfs_device, 1359668e48afSAnand Jain devid_kobj); 1360668e48afSAnand Jain 1361668e48afSAnand Jain memset(&device->devid_kobj, 0, sizeof(struct kobject)); 1362668e48afSAnand Jain complete(&device->kobj_unregister); 1363668e48afSAnand Jain } 1364668e48afSAnand Jain 1365668e48afSAnand Jain static struct kobj_type devid_ktype = { 1366668e48afSAnand Jain .sysfs_ops = &kobj_sysfs_ops, 1367668e48afSAnand Jain .default_groups = devid_groups, 1368668e48afSAnand Jain .release = btrfs_release_devid_kobj, 1369668e48afSAnand Jain }; 1370668e48afSAnand Jain 1371cd36da2eSAnand Jain int btrfs_sysfs_add_device(struct btrfs_device *device) 137229e5be24SJeff Mahoney { 1373178a16c9SAnand Jain int ret; 1374a47bd78dSJosef Bacik unsigned int nofs_flag; 1375178a16c9SAnand Jain struct kobject *devices_kobj; 1376178a16c9SAnand Jain struct kobject *devinfo_kobj; 1377178a16c9SAnand Jain 1378178a16c9SAnand Jain /* 1379178a16c9SAnand Jain * Make sure we use the fs_info::fs_devices to fetch the kobjects even 1380178a16c9SAnand Jain * for the seed fs_devices 1381178a16c9SAnand Jain */ 1382178a16c9SAnand Jain devices_kobj = device->fs_info->fs_devices->devices_kobj; 1383178a16c9SAnand Jain devinfo_kobj = device->fs_info->fs_devices->devinfo_kobj; 1384178a16c9SAnand Jain ASSERT(devices_kobj); 1385178a16c9SAnand Jain ASSERT(devinfo_kobj); 138629e5be24SJeff Mahoney 1387a47bd78dSJosef Bacik nofs_flag = memalloc_nofs_save(); 1388f085381eSAnand Jain 1389178a16c9SAnand Jain if (device->bdev) { 1390668e48afSAnand Jain struct hd_struct *disk; 1391668e48afSAnand Jain struct kobject *disk_kobj; 1392668e48afSAnand Jain 1393178a16c9SAnand Jain disk = device->bdev->bd_part; 1394f085381eSAnand Jain disk_kobj = &part_to_dev(disk)->kobj; 139529e5be24SJeff Mahoney 1396178a16c9SAnand Jain ret = sysfs_create_link(devices_kobj, disk_kobj, disk_kobj->name); 1397178a16c9SAnand Jain if (ret) { 1398178a16c9SAnand Jain btrfs_warn(device->fs_info, 1399178a16c9SAnand Jain "creating sysfs device link for devid %llu failed: %d", 1400178a16c9SAnand Jain device->devid, ret); 1401178a16c9SAnand Jain goto out; 1402178a16c9SAnand Jain } 140329e5be24SJeff Mahoney } 140429e5be24SJeff Mahoney 1405178a16c9SAnand Jain init_completion(&device->kobj_unregister); 1406178a16c9SAnand Jain ret = kobject_init_and_add(&device->devid_kobj, &devid_ktype, 1407178a16c9SAnand Jain devinfo_kobj, "%llu", device->devid); 1408178a16c9SAnand Jain if (ret) { 1409178a16c9SAnand Jain kobject_put(&device->devid_kobj); 1410178a16c9SAnand Jain btrfs_warn(device->fs_info, 1411178a16c9SAnand Jain "devinfo init for devid %llu failed: %d", 1412178a16c9SAnand Jain device->devid, ret); 1413668e48afSAnand Jain } 1414178a16c9SAnand Jain 1415178a16c9SAnand Jain out: 1416a47bd78dSJosef Bacik memalloc_nofs_restore(nofs_flag); 1417178a16c9SAnand Jain return ret; 1418178a16c9SAnand Jain } 1419668e48afSAnand Jain 1420cd36da2eSAnand Jain static int btrfs_sysfs_add_fs_devices(struct btrfs_fs_devices *fs_devices) 1421178a16c9SAnand Jain { 1422178a16c9SAnand Jain int ret; 1423cd36da2eSAnand Jain struct btrfs_device *device; 142430b0e4e0SAnand Jain struct btrfs_fs_devices *seed; 1425178a16c9SAnand Jain 1426178a16c9SAnand Jain list_for_each_entry(device, &fs_devices->devices, dev_list) { 1427178a16c9SAnand Jain ret = btrfs_sysfs_add_device(device); 1428178a16c9SAnand Jain if (ret) 14297ad3912aSAnand Jain goto fail; 1430178a16c9SAnand Jain } 1431178a16c9SAnand Jain 143230b0e4e0SAnand Jain list_for_each_entry(seed, &fs_devices->seed_list, seed_list) { 143330b0e4e0SAnand Jain list_for_each_entry(device, &seed->devices, dev_list) { 143430b0e4e0SAnand Jain ret = btrfs_sysfs_add_device(device); 143530b0e4e0SAnand Jain if (ret) 14367ad3912aSAnand Jain goto fail; 143730b0e4e0SAnand Jain } 143830b0e4e0SAnand Jain } 143930b0e4e0SAnand Jain 1440178a16c9SAnand Jain return 0; 14417ad3912aSAnand Jain 14427ad3912aSAnand Jain fail: 14437ad3912aSAnand Jain btrfs_sysfs_remove_fs_devices(fs_devices); 14447ad3912aSAnand Jain return ret; 144529e5be24SJeff Mahoney } 144629e5be24SJeff Mahoney 14475b28692eSDavid Sterba void btrfs_kobject_uevent(struct block_device *bdev, enum kobject_action action) 14485b28692eSDavid Sterba { 14495b28692eSDavid Sterba int ret; 14505b28692eSDavid Sterba 14515b28692eSDavid Sterba ret = kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, action); 14525b28692eSDavid Sterba if (ret) 14535b28692eSDavid Sterba pr_warn("BTRFS: Sending event '%d' to kobject: '%s' (%p): failed\n", 14545b28692eSDavid Sterba action, kobject_name(&disk_to_dev(bdev->bd_disk)->kobj), 14555b28692eSDavid Sterba &disk_to_dev(bdev->bd_disk)->kobj); 14565b28692eSDavid Sterba } 14575b28692eSDavid Sterba 14588e560081SNikolay Borisov void btrfs_sysfs_update_sprout_fsid(struct btrfs_fs_devices *fs_devices) 14598e560081SNikolay Borisov 1460f93c3997SDavid Sterba { 1461f93c3997SDavid Sterba char fsid_buf[BTRFS_UUID_UNPARSED_SIZE]; 1462f93c3997SDavid Sterba 1463f93c3997SDavid Sterba /* 1464f93c3997SDavid Sterba * Sprouting changes fsid of the mounted filesystem, rename the fsid 1465f93c3997SDavid Sterba * directory 1466f93c3997SDavid Sterba */ 14678e560081SNikolay Borisov snprintf(fsid_buf, BTRFS_UUID_UNPARSED_SIZE, "%pU", fs_devices->fsid); 1468f93c3997SDavid Sterba if (kobject_rename(&fs_devices->fsid_kobj, fsid_buf)) 1469f93c3997SDavid Sterba btrfs_warn(fs_devices->fs_info, 1470f93c3997SDavid Sterba "sysfs: failed to create fsid for sprout"); 1471f93c3997SDavid Sterba } 1472f93c3997SDavid Sterba 1473668e48afSAnand Jain void btrfs_sysfs_update_devid(struct btrfs_device *device) 1474668e48afSAnand Jain { 1475668e48afSAnand Jain char tmp[24]; 1476668e48afSAnand Jain 1477668e48afSAnand Jain snprintf(tmp, sizeof(tmp), "%llu", device->devid); 1478668e48afSAnand Jain 1479668e48afSAnand Jain if (kobject_rename(&device->devid_kobj, tmp)) 1480668e48afSAnand Jain btrfs_warn(device->fs_devices->fs_info, 1481668e48afSAnand Jain "sysfs: failed to update devid for %llu", 1482668e48afSAnand Jain device->devid); 1483668e48afSAnand Jain } 1484668e48afSAnand Jain 1485510d7360SJeff Mahoney /* /sys/fs/btrfs/ entry */ 1486510d7360SJeff Mahoney static struct kset *btrfs_kset; 1487510d7360SJeff Mahoney 148872059215SAnand Jain /* 1489c6761a9eSAnand Jain * Creates: 1490c6761a9eSAnand Jain * /sys/fs/btrfs/UUID 1491c6761a9eSAnand Jain * 149272059215SAnand Jain * Can be called by the device discovery thread. 149372059215SAnand Jain */ 1494c6761a9eSAnand Jain int btrfs_sysfs_add_fsid(struct btrfs_fs_devices *fs_devs) 14955ac1d209SJeff Mahoney { 14965ac1d209SJeff Mahoney int error; 14975ac1d209SJeff Mahoney 14982e7910d6SAnand Jain init_completion(&fs_devs->kobj_unregister); 1499c1b7e474SAnand Jain fs_devs->fsid_kobj.kset = btrfs_kset; 1500c6761a9eSAnand Jain error = kobject_init_and_add(&fs_devs->fsid_kobj, &btrfs_ktype, NULL, 1501c6761a9eSAnand Jain "%pU", fs_devs->fsid); 1502e3277335STobin C. Harding if (error) { 1503e3277335STobin C. Harding kobject_put(&fs_devs->fsid_kobj); 150472059215SAnand Jain return error; 150572059215SAnand Jain } 150672059215SAnand Jain 1507bc036bb3SAnand Jain fs_devs->devices_kobj = kobject_create_and_add("devices", 1508bc036bb3SAnand Jain &fs_devs->fsid_kobj); 1509bc036bb3SAnand Jain if (!fs_devs->devices_kobj) { 1510bc036bb3SAnand Jain btrfs_err(fs_devs->fs_info, 1511bc036bb3SAnand Jain "failed to init sysfs device interface"); 15121f6087e6SAnand Jain btrfs_sysfs_remove_fsid(fs_devs); 1513bc036bb3SAnand Jain return -ENOMEM; 1514bc036bb3SAnand Jain } 1515bc036bb3SAnand Jain 1516a013d141SAnand Jain fs_devs->devinfo_kobj = kobject_create_and_add("devinfo", 1517a013d141SAnand Jain &fs_devs->fsid_kobj); 1518a013d141SAnand Jain if (!fs_devs->devinfo_kobj) { 1519a013d141SAnand Jain btrfs_err(fs_devs->fs_info, 1520a013d141SAnand Jain "failed to init sysfs devinfo kobject"); 1521a013d141SAnand Jain btrfs_sysfs_remove_fsid(fs_devs); 1522a013d141SAnand Jain return -ENOMEM; 1523a013d141SAnand Jain } 1524a013d141SAnand Jain 1525e3277335STobin C. Harding return 0; 1526e3277335STobin C. Harding } 1527e3277335STobin C. Harding 152896f3136eSAnand Jain int btrfs_sysfs_add_mounted(struct btrfs_fs_info *fs_info) 152972059215SAnand Jain { 153072059215SAnand Jain int error; 15312e7910d6SAnand Jain struct btrfs_fs_devices *fs_devs = fs_info->fs_devices; 1532c1b7e474SAnand Jain struct kobject *fsid_kobj = &fs_devs->fsid_kobj; 153372059215SAnand Jain 1534cd36da2eSAnand Jain error = btrfs_sysfs_add_fs_devices(fs_devs); 1535e453d989SJeff Mahoney if (error) 1536e453d989SJeff Mahoney return error; 1537510d7360SJeff Mahoney 1538c1b7e474SAnand Jain error = sysfs_create_files(fsid_kobj, btrfs_attrs); 1539e453d989SJeff Mahoney if (error) { 154053f8a74cSAnand Jain btrfs_sysfs_remove_fs_devices(fs_devs); 1541e453d989SJeff Mahoney return error; 1542e453d989SJeff Mahoney } 154379da4fa4SJeff Mahoney 1544c1b7e474SAnand Jain error = sysfs_create_group(fsid_kobj, 15450dd2906fSAnand Jain &btrfs_feature_attr_group); 15460dd2906fSAnand Jain if (error) 15470dd2906fSAnand Jain goto failure; 15480dd2906fSAnand Jain 15496e369febSDavid Sterba #ifdef CONFIG_BTRFS_DEBUG 155093945cb4SDennis Zhou fs_info->debug_kobj = kobject_create_and_add("debug", fsid_kobj); 155193945cb4SDennis Zhou if (!fs_info->debug_kobj) { 155293945cb4SDennis Zhou error = -ENOMEM; 155393945cb4SDennis Zhou goto failure; 155493945cb4SDennis Zhou } 155593945cb4SDennis Zhou 155693945cb4SDennis Zhou error = sysfs_create_files(fs_info->debug_kobj, btrfs_debug_mount_attrs); 15576e369febSDavid Sterba if (error) 15586e369febSDavid Sterba goto failure; 1559e4faab84SDennis Zhou 1560e4faab84SDennis Zhou /* Discard directory */ 1561e4faab84SDennis Zhou fs_info->discard_debug_kobj = kobject_create_and_add("discard", 1562e4faab84SDennis Zhou fs_info->debug_kobj); 1563e4faab84SDennis Zhou if (!fs_info->discard_debug_kobj) { 1564e4faab84SDennis Zhou error = -ENOMEM; 1565e4faab84SDennis Zhou goto failure; 1566e4faab84SDennis Zhou } 1567e4faab84SDennis Zhou 1568e4faab84SDennis Zhou error = sysfs_create_files(fs_info->discard_debug_kobj, 1569e4faab84SDennis Zhou discard_debug_attrs); 1570e4faab84SDennis Zhou if (error) 1571e4faab84SDennis Zhou goto failure; 15726e369febSDavid Sterba #endif 15736e369febSDavid Sterba 1574e453d989SJeff Mahoney error = addrm_unknown_feature_attrs(fs_info, true); 157579da4fa4SJeff Mahoney if (error) 157679da4fa4SJeff Mahoney goto failure; 157779da4fa4SJeff Mahoney 15783092c68fSNikolay Borisov error = sysfs_create_link(fsid_kobj, &fs_info->sb->s_bdi->dev->kobj, "bdi"); 15793092c68fSNikolay Borisov if (error) 15803092c68fSNikolay Borisov goto failure; 15813092c68fSNikolay Borisov 15826ab0a202SJeff Mahoney fs_info->space_info_kobj = kobject_create_and_add("allocation", 1583c1b7e474SAnand Jain fsid_kobj); 15846ab0a202SJeff Mahoney if (!fs_info->space_info_kobj) { 15856ab0a202SJeff Mahoney error = -ENOMEM; 15866ab0a202SJeff Mahoney goto failure; 15876ab0a202SJeff Mahoney } 15886ab0a202SJeff Mahoney 15896ab0a202SJeff Mahoney error = sysfs_create_files(fs_info->space_info_kobj, allocation_attrs); 15906ab0a202SJeff Mahoney if (error) 15916ab0a202SJeff Mahoney goto failure; 15926ab0a202SJeff Mahoney 159379da4fa4SJeff Mahoney return 0; 159479da4fa4SJeff Mahoney failure: 15956618a59bSAnand Jain btrfs_sysfs_remove_mounted(fs_info); 15965ac1d209SJeff Mahoney return error; 15975ac1d209SJeff Mahoney } 15985ac1d209SJeff Mahoney 159949e5fb46SQu Wenruo static inline struct btrfs_fs_info *qgroup_kobj_to_fs_info(struct kobject *kobj) 160049e5fb46SQu Wenruo { 160149e5fb46SQu Wenruo return to_fs_info(kobj->parent->parent); 160249e5fb46SQu Wenruo } 160349e5fb46SQu Wenruo 160449e5fb46SQu Wenruo #define QGROUP_ATTR(_member, _show_name) \ 160549e5fb46SQu Wenruo static ssize_t btrfs_qgroup_show_##_member(struct kobject *qgroup_kobj, \ 160649e5fb46SQu Wenruo struct kobj_attribute *a, \ 160749e5fb46SQu Wenruo char *buf) \ 160849e5fb46SQu Wenruo { \ 160949e5fb46SQu Wenruo struct btrfs_fs_info *fs_info = qgroup_kobj_to_fs_info(qgroup_kobj); \ 161049e5fb46SQu Wenruo struct btrfs_qgroup *qgroup = container_of(qgroup_kobj, \ 161149e5fb46SQu Wenruo struct btrfs_qgroup, kobj); \ 161249e5fb46SQu Wenruo return btrfs_show_u64(&qgroup->_member, &fs_info->qgroup_lock, buf); \ 161349e5fb46SQu Wenruo } \ 161449e5fb46SQu Wenruo BTRFS_ATTR(qgroup, _show_name, btrfs_qgroup_show_##_member) 161549e5fb46SQu Wenruo 161649e5fb46SQu Wenruo #define QGROUP_RSV_ATTR(_name, _type) \ 161749e5fb46SQu Wenruo static ssize_t btrfs_qgroup_rsv_show_##_name(struct kobject *qgroup_kobj, \ 161849e5fb46SQu Wenruo struct kobj_attribute *a, \ 161949e5fb46SQu Wenruo char *buf) \ 162049e5fb46SQu Wenruo { \ 162149e5fb46SQu Wenruo struct btrfs_fs_info *fs_info = qgroup_kobj_to_fs_info(qgroup_kobj); \ 162249e5fb46SQu Wenruo struct btrfs_qgroup *qgroup = container_of(qgroup_kobj, \ 162349e5fb46SQu Wenruo struct btrfs_qgroup, kobj); \ 162449e5fb46SQu Wenruo return btrfs_show_u64(&qgroup->rsv.values[_type], \ 162549e5fb46SQu Wenruo &fs_info->qgroup_lock, buf); \ 162649e5fb46SQu Wenruo } \ 162749e5fb46SQu Wenruo BTRFS_ATTR(qgroup, rsv_##_name, btrfs_qgroup_rsv_show_##_name) 162849e5fb46SQu Wenruo 162949e5fb46SQu Wenruo QGROUP_ATTR(rfer, referenced); 163049e5fb46SQu Wenruo QGROUP_ATTR(excl, exclusive); 163149e5fb46SQu Wenruo QGROUP_ATTR(max_rfer, max_referenced); 163249e5fb46SQu Wenruo QGROUP_ATTR(max_excl, max_exclusive); 163349e5fb46SQu Wenruo QGROUP_ATTR(lim_flags, limit_flags); 163449e5fb46SQu Wenruo QGROUP_RSV_ATTR(data, BTRFS_QGROUP_RSV_DATA); 163549e5fb46SQu Wenruo QGROUP_RSV_ATTR(meta_pertrans, BTRFS_QGROUP_RSV_META_PERTRANS); 163649e5fb46SQu Wenruo QGROUP_RSV_ATTR(meta_prealloc, BTRFS_QGROUP_RSV_META_PREALLOC); 163749e5fb46SQu Wenruo 163849e5fb46SQu Wenruo static struct attribute *qgroup_attrs[] = { 163949e5fb46SQu Wenruo BTRFS_ATTR_PTR(qgroup, referenced), 164049e5fb46SQu Wenruo BTRFS_ATTR_PTR(qgroup, exclusive), 164149e5fb46SQu Wenruo BTRFS_ATTR_PTR(qgroup, max_referenced), 164249e5fb46SQu Wenruo BTRFS_ATTR_PTR(qgroup, max_exclusive), 164349e5fb46SQu Wenruo BTRFS_ATTR_PTR(qgroup, limit_flags), 164449e5fb46SQu Wenruo BTRFS_ATTR_PTR(qgroup, rsv_data), 164549e5fb46SQu Wenruo BTRFS_ATTR_PTR(qgroup, rsv_meta_pertrans), 164649e5fb46SQu Wenruo BTRFS_ATTR_PTR(qgroup, rsv_meta_prealloc), 164749e5fb46SQu Wenruo NULL 164849e5fb46SQu Wenruo }; 164949e5fb46SQu Wenruo ATTRIBUTE_GROUPS(qgroup); 165049e5fb46SQu Wenruo 165149e5fb46SQu Wenruo static void qgroup_release(struct kobject *kobj) 165249e5fb46SQu Wenruo { 165349e5fb46SQu Wenruo struct btrfs_qgroup *qgroup = container_of(kobj, struct btrfs_qgroup, kobj); 165449e5fb46SQu Wenruo 165549e5fb46SQu Wenruo memset(&qgroup->kobj, 0, sizeof(*kobj)); 165649e5fb46SQu Wenruo } 165749e5fb46SQu Wenruo 165849e5fb46SQu Wenruo static struct kobj_type qgroup_ktype = { 165949e5fb46SQu Wenruo .sysfs_ops = &kobj_sysfs_ops, 166049e5fb46SQu Wenruo .release = qgroup_release, 166149e5fb46SQu Wenruo .default_groups = qgroup_groups, 166249e5fb46SQu Wenruo }; 166349e5fb46SQu Wenruo 166449e5fb46SQu Wenruo int btrfs_sysfs_add_one_qgroup(struct btrfs_fs_info *fs_info, 166549e5fb46SQu Wenruo struct btrfs_qgroup *qgroup) 166649e5fb46SQu Wenruo { 166749e5fb46SQu Wenruo struct kobject *qgroups_kobj = fs_info->qgroups_kobj; 166849e5fb46SQu Wenruo int ret; 166949e5fb46SQu Wenruo 167049e5fb46SQu Wenruo if (test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state)) 167149e5fb46SQu Wenruo return 0; 167249e5fb46SQu Wenruo if (qgroup->kobj.state_initialized) 167349e5fb46SQu Wenruo return 0; 167449e5fb46SQu Wenruo if (!qgroups_kobj) 167549e5fb46SQu Wenruo return -EINVAL; 167649e5fb46SQu Wenruo 167749e5fb46SQu Wenruo ret = kobject_init_and_add(&qgroup->kobj, &qgroup_ktype, qgroups_kobj, 167849e5fb46SQu Wenruo "%hu_%llu", btrfs_qgroup_level(qgroup->qgroupid), 167949e5fb46SQu Wenruo btrfs_qgroup_subvolid(qgroup->qgroupid)); 168049e5fb46SQu Wenruo if (ret < 0) 168149e5fb46SQu Wenruo kobject_put(&qgroup->kobj); 168249e5fb46SQu Wenruo 168349e5fb46SQu Wenruo return ret; 168449e5fb46SQu Wenruo } 168549e5fb46SQu Wenruo 168649e5fb46SQu Wenruo void btrfs_sysfs_del_qgroups(struct btrfs_fs_info *fs_info) 168749e5fb46SQu Wenruo { 168849e5fb46SQu Wenruo struct btrfs_qgroup *qgroup; 168949e5fb46SQu Wenruo struct btrfs_qgroup *next; 169049e5fb46SQu Wenruo 169149e5fb46SQu Wenruo if (test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state)) 169249e5fb46SQu Wenruo return; 169349e5fb46SQu Wenruo 169449e5fb46SQu Wenruo rbtree_postorder_for_each_entry_safe(qgroup, next, 169549e5fb46SQu Wenruo &fs_info->qgroup_tree, node) 169649e5fb46SQu Wenruo btrfs_sysfs_del_one_qgroup(fs_info, qgroup); 169762ab2cc0SQu Wenruo if (fs_info->qgroups_kobj) { 169849e5fb46SQu Wenruo kobject_del(fs_info->qgroups_kobj); 169949e5fb46SQu Wenruo kobject_put(fs_info->qgroups_kobj); 170049e5fb46SQu Wenruo fs_info->qgroups_kobj = NULL; 170149e5fb46SQu Wenruo } 170262ab2cc0SQu Wenruo } 170349e5fb46SQu Wenruo 170449e5fb46SQu Wenruo /* Called when qgroups get initialized, thus there is no need for locking */ 170549e5fb46SQu Wenruo int btrfs_sysfs_add_qgroups(struct btrfs_fs_info *fs_info) 170649e5fb46SQu Wenruo { 170749e5fb46SQu Wenruo struct kobject *fsid_kobj = &fs_info->fs_devices->fsid_kobj; 170849e5fb46SQu Wenruo struct btrfs_qgroup *qgroup; 170949e5fb46SQu Wenruo struct btrfs_qgroup *next; 171049e5fb46SQu Wenruo int ret = 0; 171149e5fb46SQu Wenruo 171249e5fb46SQu Wenruo if (test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state)) 171349e5fb46SQu Wenruo return 0; 171449e5fb46SQu Wenruo 171549e5fb46SQu Wenruo ASSERT(fsid_kobj); 171649e5fb46SQu Wenruo if (fs_info->qgroups_kobj) 171749e5fb46SQu Wenruo return 0; 171849e5fb46SQu Wenruo 171949e5fb46SQu Wenruo fs_info->qgroups_kobj = kobject_create_and_add("qgroups", fsid_kobj); 172049e5fb46SQu Wenruo if (!fs_info->qgroups_kobj) { 172149e5fb46SQu Wenruo ret = -ENOMEM; 172249e5fb46SQu Wenruo goto out; 172349e5fb46SQu Wenruo } 172449e5fb46SQu Wenruo rbtree_postorder_for_each_entry_safe(qgroup, next, 172549e5fb46SQu Wenruo &fs_info->qgroup_tree, node) { 172649e5fb46SQu Wenruo ret = btrfs_sysfs_add_one_qgroup(fs_info, qgroup); 172749e5fb46SQu Wenruo if (ret < 0) 172849e5fb46SQu Wenruo goto out; 172949e5fb46SQu Wenruo } 173049e5fb46SQu Wenruo 173149e5fb46SQu Wenruo out: 173249e5fb46SQu Wenruo if (ret < 0) 173349e5fb46SQu Wenruo btrfs_sysfs_del_qgroups(fs_info); 173449e5fb46SQu Wenruo return ret; 173549e5fb46SQu Wenruo } 173649e5fb46SQu Wenruo 173749e5fb46SQu Wenruo void btrfs_sysfs_del_one_qgroup(struct btrfs_fs_info *fs_info, 173849e5fb46SQu Wenruo struct btrfs_qgroup *qgroup) 173949e5fb46SQu Wenruo { 174049e5fb46SQu Wenruo if (test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state)) 174149e5fb46SQu Wenruo return; 174249e5fb46SQu Wenruo 174349e5fb46SQu Wenruo if (qgroup->kobj.state_initialized) { 174449e5fb46SQu Wenruo kobject_del(&qgroup->kobj); 174549e5fb46SQu Wenruo kobject_put(&qgroup->kobj); 174649e5fb46SQu Wenruo } 174749e5fb46SQu Wenruo } 1748444e7516SDavid Sterba 1749444e7516SDavid Sterba /* 1750444e7516SDavid Sterba * Change per-fs features in /sys/fs/btrfs/UUID/features to match current 1751444e7516SDavid Sterba * values in superblock. Call after any changes to incompat/compat_ro flags 1752444e7516SDavid Sterba */ 1753444e7516SDavid Sterba void btrfs_sysfs_feature_update(struct btrfs_fs_info *fs_info, 1754444e7516SDavid Sterba u64 bit, enum btrfs_feature_set set) 1755444e7516SDavid Sterba { 1756444e7516SDavid Sterba struct btrfs_fs_devices *fs_devs; 1757444e7516SDavid Sterba struct kobject *fsid_kobj; 175824646481SLeon Romanovsky u64 __maybe_unused features; 175924646481SLeon Romanovsky int __maybe_unused ret; 1760444e7516SDavid Sterba 1761444e7516SDavid Sterba if (!fs_info) 1762444e7516SDavid Sterba return; 1763444e7516SDavid Sterba 176424646481SLeon Romanovsky /* 176524646481SLeon Romanovsky * See 14e46e04958df74 and e410e34fad913dd, feature bit updates are not 176624646481SLeon Romanovsky * safe when called from some contexts (eg. balance) 176724646481SLeon Romanovsky */ 1768444e7516SDavid Sterba features = get_features(fs_info, set); 1769444e7516SDavid Sterba ASSERT(bit & supported_feature_masks[set]); 1770444e7516SDavid Sterba 1771444e7516SDavid Sterba fs_devs = fs_info->fs_devices; 1772444e7516SDavid Sterba fsid_kobj = &fs_devs->fsid_kobj; 1773444e7516SDavid Sterba 1774bf609206SDavid Sterba if (!fsid_kobj->state_initialized) 1775bf609206SDavid Sterba return; 1776bf609206SDavid Sterba 1777444e7516SDavid Sterba /* 1778444e7516SDavid Sterba * FIXME: this is too heavy to update just one value, ideally we'd like 1779444e7516SDavid Sterba * to use sysfs_update_group but some refactoring is needed first. 1780444e7516SDavid Sterba */ 1781444e7516SDavid Sterba sysfs_remove_group(fsid_kobj, &btrfs_feature_attr_group); 1782444e7516SDavid Sterba ret = sysfs_create_group(fsid_kobj, &btrfs_feature_attr_group); 1783444e7516SDavid Sterba } 1784444e7516SDavid Sterba 1785f5c29bd9SLiu Bo int __init btrfs_init_sysfs(void) 178658176a96SJosef Bacik { 1787079b72bcSJeff Mahoney int ret; 17881bae3098SDavid Sterba 1789e3fe4e71SGreg KH btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj); 1790e3fe4e71SGreg KH if (!btrfs_kset) 1791e3fe4e71SGreg KH return -ENOMEM; 1792079b72bcSJeff Mahoney 17931bae3098SDavid Sterba init_feature_attrs(); 17941bae3098SDavid Sterba ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); 1795001a648dSFilipe Manana if (ret) 1796001a648dSFilipe Manana goto out2; 1797f902bd3aSMisono Tomohiro ret = sysfs_merge_group(&btrfs_kset->kobj, 1798f902bd3aSMisono Tomohiro &btrfs_static_feature_attr_group); 1799f902bd3aSMisono Tomohiro if (ret) 1800f902bd3aSMisono Tomohiro goto out_remove_group; 1801001a648dSFilipe Manana 18026e369febSDavid Sterba #ifdef CONFIG_BTRFS_DEBUG 18036e369febSDavid Sterba ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_debug_feature_attr_group); 18046e369febSDavid Sterba if (ret) 18056e369febSDavid Sterba goto out2; 18066e369febSDavid Sterba #endif 18076e369febSDavid Sterba 1808001a648dSFilipe Manana return 0; 1809f902bd3aSMisono Tomohiro 1810f902bd3aSMisono Tomohiro out_remove_group: 1811f902bd3aSMisono Tomohiro sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); 1812001a648dSFilipe Manana out2: 1813001a648dSFilipe Manana kset_unregister(btrfs_kset); 18141bae3098SDavid Sterba 18151bae3098SDavid Sterba return ret; 181658176a96SJosef Bacik } 181758176a96SJosef Bacik 1818e67c718bSDavid Sterba void __cold btrfs_exit_sysfs(void) 181958176a96SJosef Bacik { 1820f902bd3aSMisono Tomohiro sysfs_unmerge_group(&btrfs_kset->kobj, 1821f902bd3aSMisono Tomohiro &btrfs_static_feature_attr_group); 1822079b72bcSJeff Mahoney sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); 182371e8978eSDennis Zhou #ifdef CONFIG_BTRFS_DEBUG 182471e8978eSDennis Zhou sysfs_remove_group(&btrfs_kset->kobj, &btrfs_debug_feature_attr_group); 182571e8978eSDennis Zhou #endif 1826e3fe4e71SGreg KH kset_unregister(btrfs_kset); 182758176a96SJosef Bacik } 182855d47414SChris Mason 1829