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" 17bae45de0SChris Mason #include "transaction.h" 18079b72bcSJeff Mahoney #include "sysfs.h" 1929e5be24SJeff Mahoney #include "volumes.h" 208719aaaeSJosef Bacik #include "space-info.h" 21aac0023cSJosef Bacik #include "block-group.h" 22079b72bcSJeff Mahoney 239188db61SDavid Sterba struct btrfs_feature_attr { 249188db61SDavid Sterba struct kobj_attribute kobj_attr; 259188db61SDavid Sterba enum btrfs_feature_set feature_set; 269188db61SDavid Sterba u64 feature_bit; 279188db61SDavid Sterba }; 289188db61SDavid Sterba 299188db61SDavid Sterba /* For raid type sysfs entries */ 309188db61SDavid Sterba struct raid_kobject { 319188db61SDavid Sterba u64 flags; 329188db61SDavid Sterba struct kobject kobj; 339188db61SDavid Sterba }; 349188db61SDavid Sterba 359188db61SDavid Sterba #define __INIT_KOBJ_ATTR(_name, _mode, _show, _store) \ 369188db61SDavid Sterba { \ 379188db61SDavid Sterba .attr = { .name = __stringify(_name), .mode = _mode }, \ 389188db61SDavid Sterba .show = _show, \ 399188db61SDavid Sterba .store = _store, \ 409188db61SDavid Sterba } 419188db61SDavid Sterba 429188db61SDavid Sterba #define BTRFS_ATTR_RW(_prefix, _name, _show, _store) \ 439188db61SDavid Sterba static struct kobj_attribute btrfs_attr_##_prefix##_##_name = \ 449188db61SDavid Sterba __INIT_KOBJ_ATTR(_name, 0644, _show, _store) 459188db61SDavid Sterba 469188db61SDavid Sterba #define BTRFS_ATTR(_prefix, _name, _show) \ 479188db61SDavid Sterba static struct kobj_attribute btrfs_attr_##_prefix##_##_name = \ 489188db61SDavid Sterba __INIT_KOBJ_ATTR(_name, 0444, _show, NULL) 499188db61SDavid Sterba 509188db61SDavid Sterba #define BTRFS_ATTR_PTR(_prefix, _name) \ 519188db61SDavid Sterba (&btrfs_attr_##_prefix##_##_name.attr) 529188db61SDavid Sterba 539188db61SDavid Sterba #define BTRFS_FEAT_ATTR(_name, _feature_set, _feature_prefix, _feature_bit) \ 549188db61SDavid Sterba static struct btrfs_feature_attr btrfs_attr_features_##_name = { \ 559188db61SDavid Sterba .kobj_attr = __INIT_KOBJ_ATTR(_name, S_IRUGO, \ 569188db61SDavid Sterba btrfs_feature_attr_show, \ 579188db61SDavid Sterba btrfs_feature_attr_store), \ 589188db61SDavid Sterba .feature_set = _feature_set, \ 599188db61SDavid Sterba .feature_bit = _feature_prefix ##_## _feature_bit, \ 609188db61SDavid Sterba } 619188db61SDavid Sterba #define BTRFS_FEAT_ATTR_PTR(_name) \ 629188db61SDavid Sterba (&btrfs_attr_features_##_name.kobj_attr.attr) 639188db61SDavid Sterba 649188db61SDavid Sterba #define BTRFS_FEAT_ATTR_COMPAT(name, feature) \ 659188db61SDavid Sterba BTRFS_FEAT_ATTR(name, FEAT_COMPAT, BTRFS_FEATURE_COMPAT, feature) 669188db61SDavid Sterba #define BTRFS_FEAT_ATTR_COMPAT_RO(name, feature) \ 679188db61SDavid Sterba BTRFS_FEAT_ATTR(name, FEAT_COMPAT_RO, BTRFS_FEATURE_COMPAT_RO, feature) 689188db61SDavid Sterba #define BTRFS_FEAT_ATTR_INCOMPAT(name, feature) \ 699188db61SDavid Sterba BTRFS_FEAT_ATTR(name, FEAT_INCOMPAT, BTRFS_FEATURE_INCOMPAT, feature) 709188db61SDavid Sterba 71510d7360SJeff Mahoney static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj); 722e7910d6SAnand Jain static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj); 735ac1d209SJeff Mahoney 748f52316cSDavid Sterba static struct btrfs_feature_attr *to_btrfs_feature_attr(struct kobj_attribute *a) 758f52316cSDavid Sterba { 768f52316cSDavid Sterba return container_of(a, struct btrfs_feature_attr, kobj_attr); 778f52316cSDavid Sterba } 788f52316cSDavid Sterba 798f52316cSDavid Sterba static struct kobj_attribute *attr_to_btrfs_attr(struct attribute *attr) 808f52316cSDavid Sterba { 818f52316cSDavid Sterba return container_of(attr, struct kobj_attribute, attr); 828f52316cSDavid Sterba } 838f52316cSDavid Sterba 848f52316cSDavid Sterba static struct btrfs_feature_attr *attr_to_btrfs_feature_attr( 858f52316cSDavid Sterba struct attribute *attr) 868f52316cSDavid Sterba { 878f52316cSDavid Sterba return to_btrfs_feature_attr(attr_to_btrfs_attr(attr)); 888f52316cSDavid Sterba } 898f52316cSDavid Sterba 90510d7360SJeff Mahoney static u64 get_features(struct btrfs_fs_info *fs_info, 91510d7360SJeff Mahoney enum btrfs_feature_set set) 925ac1d209SJeff Mahoney { 93510d7360SJeff Mahoney struct btrfs_super_block *disk_super = fs_info->super_copy; 94510d7360SJeff Mahoney if (set == FEAT_COMPAT) 95510d7360SJeff Mahoney return btrfs_super_compat_flags(disk_super); 96510d7360SJeff Mahoney else if (set == FEAT_COMPAT_RO) 97510d7360SJeff Mahoney return btrfs_super_compat_ro_flags(disk_super); 98510d7360SJeff Mahoney else 99510d7360SJeff Mahoney return btrfs_super_incompat_flags(disk_super); 1005ac1d209SJeff Mahoney } 1015ac1d209SJeff Mahoney 102ba631941SJeff Mahoney static void set_features(struct btrfs_fs_info *fs_info, 103ba631941SJeff Mahoney enum btrfs_feature_set set, u64 features) 104ba631941SJeff Mahoney { 105ba631941SJeff Mahoney struct btrfs_super_block *disk_super = fs_info->super_copy; 106ba631941SJeff Mahoney if (set == FEAT_COMPAT) 107ba631941SJeff Mahoney btrfs_set_super_compat_flags(disk_super, features); 108ba631941SJeff Mahoney else if (set == FEAT_COMPAT_RO) 109ba631941SJeff Mahoney btrfs_set_super_compat_ro_flags(disk_super, features); 110ba631941SJeff Mahoney else 111ba631941SJeff Mahoney btrfs_set_super_incompat_flags(disk_super, features); 112ba631941SJeff Mahoney } 113ba631941SJeff Mahoney 114ba631941SJeff Mahoney static int can_modify_feature(struct btrfs_feature_attr *fa) 115ba631941SJeff Mahoney { 116ba631941SJeff Mahoney int val = 0; 117ba631941SJeff Mahoney u64 set, clear; 118ba631941SJeff Mahoney switch (fa->feature_set) { 119ba631941SJeff Mahoney case FEAT_COMPAT: 120ba631941SJeff Mahoney set = BTRFS_FEATURE_COMPAT_SAFE_SET; 121ba631941SJeff Mahoney clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR; 122ba631941SJeff Mahoney break; 123ba631941SJeff Mahoney case FEAT_COMPAT_RO: 124ba631941SJeff Mahoney set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET; 125ba631941SJeff Mahoney clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR; 126ba631941SJeff Mahoney break; 127ba631941SJeff Mahoney case FEAT_INCOMPAT: 128ba631941SJeff Mahoney set = BTRFS_FEATURE_INCOMPAT_SAFE_SET; 129ba631941SJeff Mahoney clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR; 130ba631941SJeff Mahoney break; 131ba631941SJeff Mahoney default: 13262e85577SJeff Mahoney pr_warn("btrfs: sysfs: unknown feature set %d\n", 133cc37bb04SDavid Sterba fa->feature_set); 134cc37bb04SDavid Sterba return 0; 135ba631941SJeff Mahoney } 136ba631941SJeff Mahoney 137ba631941SJeff Mahoney if (set & fa->feature_bit) 138ba631941SJeff Mahoney val |= 1; 139ba631941SJeff Mahoney if (clear & fa->feature_bit) 140ba631941SJeff Mahoney val |= 2; 141ba631941SJeff Mahoney 142ba631941SJeff Mahoney return val; 143ba631941SJeff Mahoney } 144ba631941SJeff Mahoney 145079b72bcSJeff Mahoney static ssize_t btrfs_feature_attr_show(struct kobject *kobj, 146079b72bcSJeff Mahoney struct kobj_attribute *a, char *buf) 147079b72bcSJeff Mahoney { 148510d7360SJeff Mahoney int val = 0; 149510d7360SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj); 150510d7360SJeff Mahoney struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a); 151ba631941SJeff Mahoney if (fs_info) { 152510d7360SJeff Mahoney u64 features = get_features(fs_info, fa->feature_set); 153510d7360SJeff Mahoney if (features & fa->feature_bit) 154510d7360SJeff Mahoney val = 1; 155ba631941SJeff Mahoney } else 156ba631941SJeff Mahoney val = can_modify_feature(fa); 157510d7360SJeff Mahoney 158510d7360SJeff Mahoney return snprintf(buf, PAGE_SIZE, "%d\n", val); 159510d7360SJeff Mahoney } 160510d7360SJeff Mahoney 161ba631941SJeff Mahoney static ssize_t btrfs_feature_attr_store(struct kobject *kobj, 162ba631941SJeff Mahoney struct kobj_attribute *a, 163ba631941SJeff Mahoney const char *buf, size_t count) 164ba631941SJeff Mahoney { 165ba631941SJeff Mahoney struct btrfs_fs_info *fs_info; 166ba631941SJeff Mahoney struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a); 167ba631941SJeff Mahoney u64 features, set, clear; 168ba631941SJeff Mahoney unsigned long val; 169ba631941SJeff Mahoney int ret; 170ba631941SJeff Mahoney 171ba631941SJeff Mahoney fs_info = to_fs_info(kobj); 172ba631941SJeff Mahoney if (!fs_info) 173ba631941SJeff Mahoney return -EPERM; 174ba631941SJeff Mahoney 175bc98a42cSDavid Howells if (sb_rdonly(fs_info->sb)) 176ee611138SDavid Sterba return -EROFS; 177ee611138SDavid Sterba 178ba631941SJeff Mahoney ret = kstrtoul(skip_spaces(buf), 0, &val); 179ba631941SJeff Mahoney if (ret) 180ba631941SJeff Mahoney return ret; 181ba631941SJeff Mahoney 182ba631941SJeff Mahoney if (fa->feature_set == FEAT_COMPAT) { 183ba631941SJeff Mahoney set = BTRFS_FEATURE_COMPAT_SAFE_SET; 184ba631941SJeff Mahoney clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR; 185ba631941SJeff Mahoney } else if (fa->feature_set == FEAT_COMPAT_RO) { 186ba631941SJeff Mahoney set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET; 187ba631941SJeff Mahoney clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR; 188ba631941SJeff Mahoney } else { 189ba631941SJeff Mahoney set = BTRFS_FEATURE_INCOMPAT_SAFE_SET; 190ba631941SJeff Mahoney clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR; 191ba631941SJeff Mahoney } 192ba631941SJeff Mahoney 193ba631941SJeff Mahoney features = get_features(fs_info, fa->feature_set); 194ba631941SJeff Mahoney 195ba631941SJeff Mahoney /* Nothing to do */ 196ba631941SJeff Mahoney if ((val && (features & fa->feature_bit)) || 197ba631941SJeff Mahoney (!val && !(features & fa->feature_bit))) 198ba631941SJeff Mahoney return count; 199ba631941SJeff Mahoney 200ba631941SJeff Mahoney if ((val && !(set & fa->feature_bit)) || 201ba631941SJeff Mahoney (!val && !(clear & fa->feature_bit))) { 202ba631941SJeff Mahoney btrfs_info(fs_info, 203ba631941SJeff Mahoney "%sabling feature %s on mounted fs is not supported.", 204ba631941SJeff Mahoney val ? "En" : "Dis", fa->kobj_attr.attr.name); 205ba631941SJeff Mahoney return -EPERM; 206ba631941SJeff Mahoney } 207ba631941SJeff Mahoney 208ba631941SJeff Mahoney btrfs_info(fs_info, "%s %s feature flag", 209ba631941SJeff Mahoney val ? "Setting" : "Clearing", fa->kobj_attr.attr.name); 210ba631941SJeff Mahoney 211ba631941SJeff Mahoney spin_lock(&fs_info->super_lock); 212ba631941SJeff Mahoney features = get_features(fs_info, fa->feature_set); 213ba631941SJeff Mahoney if (val) 214ba631941SJeff Mahoney features |= fa->feature_bit; 215ba631941SJeff Mahoney else 216ba631941SJeff Mahoney features &= ~fa->feature_bit; 217ba631941SJeff Mahoney set_features(fs_info, fa->feature_set, features); 218ba631941SJeff Mahoney spin_unlock(&fs_info->super_lock); 219ba631941SJeff Mahoney 2200eae2747SDavid Sterba /* 2210eae2747SDavid Sterba * We don't want to do full transaction commit from inside sysfs 2220eae2747SDavid Sterba */ 2230eae2747SDavid Sterba btrfs_set_pending(fs_info, COMMIT); 2240eae2747SDavid Sterba wake_up_process(fs_info->transaction_kthread); 225ba631941SJeff Mahoney 226ba631941SJeff Mahoney return count; 227ba631941SJeff Mahoney } 228ba631941SJeff Mahoney 229510d7360SJeff Mahoney static umode_t btrfs_feature_visible(struct kobject *kobj, 230510d7360SJeff Mahoney struct attribute *attr, int unused) 231510d7360SJeff Mahoney { 232510d7360SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj); 233510d7360SJeff Mahoney umode_t mode = attr->mode; 234510d7360SJeff Mahoney 235510d7360SJeff Mahoney if (fs_info) { 236510d7360SJeff Mahoney struct btrfs_feature_attr *fa; 237510d7360SJeff Mahoney u64 features; 238510d7360SJeff Mahoney 239510d7360SJeff Mahoney fa = attr_to_btrfs_feature_attr(attr); 240510d7360SJeff Mahoney features = get_features(fs_info, fa->feature_set); 241510d7360SJeff Mahoney 242ba631941SJeff Mahoney if (can_modify_feature(fa)) 243ba631941SJeff Mahoney mode |= S_IWUSR; 244ba631941SJeff Mahoney else if (!(features & fa->feature_bit)) 245510d7360SJeff Mahoney mode = 0; 246510d7360SJeff Mahoney } 247510d7360SJeff Mahoney 248510d7360SJeff Mahoney return mode; 249079b72bcSJeff Mahoney } 250079b72bcSJeff Mahoney 251079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(mixed_backref, MIXED_BACKREF); 252079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(default_subvol, DEFAULT_SUBVOL); 253079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(mixed_groups, MIXED_GROUPS); 254079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(compress_lzo, COMPRESS_LZO); 2555c1aab1dSNick Terrell BTRFS_FEAT_ATTR_INCOMPAT(compress_zstd, COMPRESS_ZSTD); 256079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(big_metadata, BIG_METADATA); 257079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(extended_iref, EXTENDED_IREF); 258079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(raid56, RAID56); 259079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(skinny_metadata, SKINNY_METADATA); 260c736c095SDavid Sterba BTRFS_FEAT_ATTR_INCOMPAT(no_holes, NO_HOLES); 26156f20f40SNikolay Borisov BTRFS_FEAT_ATTR_INCOMPAT(metadata_uuid, METADATA_UUID); 2623b5bb73bSDavid Sterba BTRFS_FEAT_ATTR_COMPAT_RO(free_space_tree, FREE_SPACE_TREE); 263cfbb825cSDavid Sterba BTRFS_FEAT_ATTR_INCOMPAT(raid1c34, RAID1C34); 264079b72bcSJeff Mahoney 265079b72bcSJeff Mahoney static struct attribute *btrfs_supported_feature_attrs[] = { 266079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(mixed_backref), 267079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(default_subvol), 268079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(mixed_groups), 269079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(compress_lzo), 2705c1aab1dSNick Terrell BTRFS_FEAT_ATTR_PTR(compress_zstd), 271079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(big_metadata), 272079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(extended_iref), 273079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(raid56), 274079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(skinny_metadata), 275c736c095SDavid Sterba BTRFS_FEAT_ATTR_PTR(no_holes), 27656f20f40SNikolay Borisov BTRFS_FEAT_ATTR_PTR(metadata_uuid), 2773b5bb73bSDavid Sterba BTRFS_FEAT_ATTR_PTR(free_space_tree), 278cfbb825cSDavid Sterba BTRFS_FEAT_ATTR_PTR(raid1c34), 279079b72bcSJeff Mahoney NULL 280079b72bcSJeff Mahoney }; 281079b72bcSJeff Mahoney 282f902bd3aSMisono Tomohiro /* 283f902bd3aSMisono Tomohiro * Features which depend on feature bits and may differ between each fs. 284f902bd3aSMisono Tomohiro * 285f902bd3aSMisono Tomohiro * /sys/fs/btrfs/features lists all available features of this kernel while 286f902bd3aSMisono Tomohiro * /sys/fs/btrfs/UUID/features shows features of the fs which are enabled or 287f902bd3aSMisono Tomohiro * can be changed online. 288f902bd3aSMisono Tomohiro */ 289079b72bcSJeff Mahoney static const struct attribute_group btrfs_feature_attr_group = { 290079b72bcSJeff Mahoney .name = "features", 291510d7360SJeff Mahoney .is_visible = btrfs_feature_visible, 292079b72bcSJeff Mahoney .attrs = btrfs_supported_feature_attrs, 293079b72bcSJeff Mahoney }; 29458176a96SJosef Bacik 295f902bd3aSMisono Tomohiro static ssize_t rmdir_subvol_show(struct kobject *kobj, 296f902bd3aSMisono Tomohiro struct kobj_attribute *ka, char *buf) 297f902bd3aSMisono Tomohiro { 298f902bd3aSMisono Tomohiro return snprintf(buf, PAGE_SIZE, "0\n"); 299f902bd3aSMisono Tomohiro } 300f902bd3aSMisono Tomohiro BTRFS_ATTR(static_feature, rmdir_subvol, rmdir_subvol_show); 301f902bd3aSMisono Tomohiro 302f7cea56cSDavid Sterba static ssize_t supported_checksums_show(struct kobject *kobj, 303f7cea56cSDavid Sterba struct kobj_attribute *a, char *buf) 304f7cea56cSDavid Sterba { 305f7cea56cSDavid Sterba ssize_t ret = 0; 306f7cea56cSDavid Sterba int i; 307f7cea56cSDavid Sterba 308f7cea56cSDavid Sterba for (i = 0; i < btrfs_get_num_csums(); i++) { 309f7cea56cSDavid Sterba /* 310f7cea56cSDavid Sterba * This "trick" only works as long as 'enum btrfs_csum_type' has 311f7cea56cSDavid Sterba * no holes in it 312f7cea56cSDavid Sterba */ 313f7cea56cSDavid Sterba ret += snprintf(buf + ret, PAGE_SIZE - ret, "%s%s", 314f7cea56cSDavid Sterba (i == 0 ? "" : " "), btrfs_super_csum_name(i)); 315f7cea56cSDavid Sterba 316f7cea56cSDavid Sterba } 317f7cea56cSDavid Sterba 318f7cea56cSDavid Sterba ret += snprintf(buf + ret, PAGE_SIZE - ret, "\n"); 319f7cea56cSDavid Sterba return ret; 320f7cea56cSDavid Sterba } 321f7cea56cSDavid Sterba BTRFS_ATTR(static_feature, supported_checksums, supported_checksums_show); 322f7cea56cSDavid Sterba 323f902bd3aSMisono Tomohiro static struct attribute *btrfs_supported_static_feature_attrs[] = { 324f902bd3aSMisono Tomohiro BTRFS_ATTR_PTR(static_feature, rmdir_subvol), 325f7cea56cSDavid Sterba BTRFS_ATTR_PTR(static_feature, supported_checksums), 326f902bd3aSMisono Tomohiro NULL 327f902bd3aSMisono Tomohiro }; 328f902bd3aSMisono Tomohiro 329f902bd3aSMisono Tomohiro /* 330f902bd3aSMisono Tomohiro * Features which only depend on kernel version. 331f902bd3aSMisono Tomohiro * 332f902bd3aSMisono Tomohiro * These are listed in /sys/fs/btrfs/features along with 333f902bd3aSMisono Tomohiro * btrfs_feature_attr_group 334f902bd3aSMisono Tomohiro */ 335f902bd3aSMisono Tomohiro static const struct attribute_group btrfs_static_feature_attr_group = { 336f902bd3aSMisono Tomohiro .name = "features", 337f902bd3aSMisono Tomohiro .attrs = btrfs_supported_static_feature_attrs, 338f902bd3aSMisono Tomohiro }; 339f902bd3aSMisono Tomohiro 3406e369febSDavid Sterba #ifdef CONFIG_BTRFS_DEBUG 3416e369febSDavid Sterba 3426e369febSDavid Sterba /* 343e4faab84SDennis Zhou * Discard statistics and tunables 344e4faab84SDennis Zhou */ 345dfb79ddbSDennis Zhou #define discard_to_fs_info(_kobj) to_fs_info((_kobj)->parent->parent) 346dfb79ddbSDennis Zhou 3475dc7c10bSDennis Zhou static ssize_t btrfs_discardable_bytes_show(struct kobject *kobj, 3485dc7c10bSDennis Zhou struct kobj_attribute *a, 3495dc7c10bSDennis Zhou char *buf) 3505dc7c10bSDennis Zhou { 3515dc7c10bSDennis Zhou struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 3525dc7c10bSDennis Zhou 3535dc7c10bSDennis Zhou return snprintf(buf, PAGE_SIZE, "%lld\n", 3545dc7c10bSDennis Zhou atomic64_read(&fs_info->discard_ctl.discardable_bytes)); 3555dc7c10bSDennis Zhou } 3565dc7c10bSDennis Zhou BTRFS_ATTR(discard, discardable_bytes, btrfs_discardable_bytes_show); 3575dc7c10bSDennis Zhou 358dfb79ddbSDennis Zhou static ssize_t btrfs_discardable_extents_show(struct kobject *kobj, 359dfb79ddbSDennis Zhou struct kobj_attribute *a, 360dfb79ddbSDennis Zhou char *buf) 361dfb79ddbSDennis Zhou { 362dfb79ddbSDennis Zhou struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 363dfb79ddbSDennis Zhou 364dfb79ddbSDennis Zhou return snprintf(buf, PAGE_SIZE, "%d\n", 365dfb79ddbSDennis Zhou atomic_read(&fs_info->discard_ctl.discardable_extents)); 366dfb79ddbSDennis Zhou } 367dfb79ddbSDennis Zhou BTRFS_ATTR(discard, discardable_extents, btrfs_discardable_extents_show); 368dfb79ddbSDennis Zhou 3699ddf648fSDennis Zhou static ssize_t btrfs_discard_bitmap_bytes_show(struct kobject *kobj, 3709ddf648fSDennis Zhou struct kobj_attribute *a, 3719ddf648fSDennis Zhou char *buf) 3729ddf648fSDennis Zhou { 3739ddf648fSDennis Zhou struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 3749ddf648fSDennis Zhou 3759ddf648fSDennis Zhou return snprintf(buf, PAGE_SIZE, "%lld\n", 3769ddf648fSDennis Zhou fs_info->discard_ctl.discard_bitmap_bytes); 3779ddf648fSDennis Zhou } 3789ddf648fSDennis Zhou BTRFS_ATTR(discard, discard_bitmap_bytes, btrfs_discard_bitmap_bytes_show); 3799ddf648fSDennis Zhou 3809ddf648fSDennis Zhou static ssize_t btrfs_discard_bytes_saved_show(struct kobject *kobj, 3819ddf648fSDennis Zhou struct kobj_attribute *a, 3829ddf648fSDennis Zhou char *buf) 3839ddf648fSDennis Zhou { 3849ddf648fSDennis Zhou struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 3859ddf648fSDennis Zhou 3869ddf648fSDennis Zhou return snprintf(buf, PAGE_SIZE, "%lld\n", 3879ddf648fSDennis Zhou atomic64_read(&fs_info->discard_ctl.discard_bytes_saved)); 3889ddf648fSDennis Zhou } 3899ddf648fSDennis Zhou BTRFS_ATTR(discard, discard_bytes_saved, btrfs_discard_bytes_saved_show); 3909ddf648fSDennis Zhou 3919ddf648fSDennis Zhou static ssize_t btrfs_discard_extent_bytes_show(struct kobject *kobj, 3929ddf648fSDennis Zhou struct kobj_attribute *a, 3939ddf648fSDennis Zhou char *buf) 3949ddf648fSDennis Zhou { 3959ddf648fSDennis Zhou struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 3969ddf648fSDennis Zhou 3979ddf648fSDennis Zhou return snprintf(buf, PAGE_SIZE, "%lld\n", 3989ddf648fSDennis Zhou fs_info->discard_ctl.discard_extent_bytes); 3999ddf648fSDennis Zhou } 4009ddf648fSDennis Zhou BTRFS_ATTR(discard, discard_extent_bytes, btrfs_discard_extent_bytes_show); 4019ddf648fSDennis Zhou 402a2309300SDennis Zhou static ssize_t btrfs_discard_iops_limit_show(struct kobject *kobj, 403a2309300SDennis Zhou struct kobj_attribute *a, 404a2309300SDennis Zhou char *buf) 405a2309300SDennis Zhou { 406a2309300SDennis Zhou struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 407a2309300SDennis Zhou 408a2309300SDennis Zhou return snprintf(buf, PAGE_SIZE, "%u\n", 409a2309300SDennis Zhou READ_ONCE(fs_info->discard_ctl.iops_limit)); 410a2309300SDennis Zhou } 411a2309300SDennis Zhou 412a2309300SDennis Zhou static ssize_t btrfs_discard_iops_limit_store(struct kobject *kobj, 413a2309300SDennis Zhou struct kobj_attribute *a, 414a2309300SDennis Zhou const char *buf, size_t len) 415a2309300SDennis Zhou { 416a2309300SDennis Zhou struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 417a2309300SDennis Zhou struct btrfs_discard_ctl *discard_ctl = &fs_info->discard_ctl; 418a2309300SDennis Zhou u32 iops_limit; 419a2309300SDennis Zhou int ret; 420a2309300SDennis Zhou 421a2309300SDennis Zhou ret = kstrtou32(buf, 10, &iops_limit); 422a2309300SDennis Zhou if (ret) 423a2309300SDennis Zhou return -EINVAL; 424a2309300SDennis Zhou 425a2309300SDennis Zhou WRITE_ONCE(discard_ctl->iops_limit, iops_limit); 426a2309300SDennis Zhou 427a2309300SDennis Zhou return len; 428a2309300SDennis Zhou } 429a2309300SDennis Zhou BTRFS_ATTR_RW(discard, iops_limit, btrfs_discard_iops_limit_show, 430a2309300SDennis Zhou btrfs_discard_iops_limit_store); 431a2309300SDennis Zhou 432e93591bbSDennis Zhou static ssize_t btrfs_discard_kbps_limit_show(struct kobject *kobj, 433e93591bbSDennis Zhou struct kobj_attribute *a, 434e93591bbSDennis Zhou char *buf) 435e93591bbSDennis Zhou { 436e93591bbSDennis Zhou struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 437e93591bbSDennis Zhou 438e93591bbSDennis Zhou return snprintf(buf, PAGE_SIZE, "%u\n", 439e93591bbSDennis Zhou READ_ONCE(fs_info->discard_ctl.kbps_limit)); 440e93591bbSDennis Zhou } 441e93591bbSDennis Zhou 442e93591bbSDennis Zhou static ssize_t btrfs_discard_kbps_limit_store(struct kobject *kobj, 443e93591bbSDennis Zhou struct kobj_attribute *a, 444e93591bbSDennis Zhou const char *buf, size_t len) 445e93591bbSDennis Zhou { 446e93591bbSDennis Zhou struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 447e93591bbSDennis Zhou struct btrfs_discard_ctl *discard_ctl = &fs_info->discard_ctl; 448e93591bbSDennis Zhou u32 kbps_limit; 449e93591bbSDennis Zhou int ret; 450e93591bbSDennis Zhou 451e93591bbSDennis Zhou ret = kstrtou32(buf, 10, &kbps_limit); 452e93591bbSDennis Zhou if (ret) 453e93591bbSDennis Zhou return -EINVAL; 454e93591bbSDennis Zhou 455e93591bbSDennis Zhou WRITE_ONCE(discard_ctl->kbps_limit, kbps_limit); 456e93591bbSDennis Zhou 457e93591bbSDennis Zhou return len; 458e93591bbSDennis Zhou } 459e93591bbSDennis Zhou BTRFS_ATTR_RW(discard, kbps_limit, btrfs_discard_kbps_limit_show, 460e93591bbSDennis Zhou btrfs_discard_kbps_limit_store); 461e93591bbSDennis Zhou 46219b2a2c7SDennis Zhou static ssize_t btrfs_discard_max_discard_size_show(struct kobject *kobj, 46319b2a2c7SDennis Zhou struct kobj_attribute *a, 46419b2a2c7SDennis Zhou char *buf) 46519b2a2c7SDennis Zhou { 46619b2a2c7SDennis Zhou struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 46719b2a2c7SDennis Zhou 46819b2a2c7SDennis Zhou return snprintf(buf, PAGE_SIZE, "%llu\n", 46919b2a2c7SDennis Zhou READ_ONCE(fs_info->discard_ctl.max_discard_size)); 47019b2a2c7SDennis Zhou } 47119b2a2c7SDennis Zhou 47219b2a2c7SDennis Zhou static ssize_t btrfs_discard_max_discard_size_store(struct kobject *kobj, 47319b2a2c7SDennis Zhou struct kobj_attribute *a, 47419b2a2c7SDennis Zhou const char *buf, size_t len) 47519b2a2c7SDennis Zhou { 47619b2a2c7SDennis Zhou struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 47719b2a2c7SDennis Zhou struct btrfs_discard_ctl *discard_ctl = &fs_info->discard_ctl; 47819b2a2c7SDennis Zhou u64 max_discard_size; 47919b2a2c7SDennis Zhou int ret; 48019b2a2c7SDennis Zhou 48119b2a2c7SDennis Zhou ret = kstrtou64(buf, 10, &max_discard_size); 48219b2a2c7SDennis Zhou if (ret) 48319b2a2c7SDennis Zhou return -EINVAL; 48419b2a2c7SDennis Zhou 48519b2a2c7SDennis Zhou WRITE_ONCE(discard_ctl->max_discard_size, max_discard_size); 48619b2a2c7SDennis Zhou 48719b2a2c7SDennis Zhou return len; 48819b2a2c7SDennis Zhou } 48919b2a2c7SDennis Zhou BTRFS_ATTR_RW(discard, max_discard_size, btrfs_discard_max_discard_size_show, 49019b2a2c7SDennis Zhou btrfs_discard_max_discard_size_store); 49119b2a2c7SDennis Zhou 492e4faab84SDennis Zhou static const struct attribute *discard_debug_attrs[] = { 4935dc7c10bSDennis Zhou BTRFS_ATTR_PTR(discard, discardable_bytes), 494dfb79ddbSDennis Zhou BTRFS_ATTR_PTR(discard, discardable_extents), 4959ddf648fSDennis Zhou BTRFS_ATTR_PTR(discard, discard_bitmap_bytes), 4969ddf648fSDennis Zhou BTRFS_ATTR_PTR(discard, discard_bytes_saved), 4979ddf648fSDennis Zhou BTRFS_ATTR_PTR(discard, discard_extent_bytes), 498a2309300SDennis Zhou BTRFS_ATTR_PTR(discard, iops_limit), 499e93591bbSDennis Zhou BTRFS_ATTR_PTR(discard, kbps_limit), 50019b2a2c7SDennis Zhou BTRFS_ATTR_PTR(discard, max_discard_size), 501e4faab84SDennis Zhou NULL, 502e4faab84SDennis Zhou }; 503e4faab84SDennis Zhou 504e4faab84SDennis Zhou /* 5056e369febSDavid Sterba * Runtime debugging exported via sysfs 5066e369febSDavid Sterba * 5076e369febSDavid Sterba * /sys/fs/btrfs/debug - applies to module or all filesystems 5086e369febSDavid Sterba * /sys/fs/btrfs/UUID - applies only to the given filesystem 5096e369febSDavid Sterba */ 51093945cb4SDennis Zhou static const struct attribute *btrfs_debug_mount_attrs[] = { 51193945cb4SDennis Zhou NULL, 51293945cb4SDennis Zhou }; 51393945cb4SDennis Zhou 5146e369febSDavid Sterba static struct attribute *btrfs_debug_feature_attrs[] = { 5156e369febSDavid Sterba NULL 5166e369febSDavid Sterba }; 5176e369febSDavid Sterba 5186e369febSDavid Sterba static const struct attribute_group btrfs_debug_feature_attr_group = { 5196e369febSDavid Sterba .name = "debug", 5206e369febSDavid Sterba .attrs = btrfs_debug_feature_attrs, 5216e369febSDavid Sterba }; 5226e369febSDavid Sterba 5236e369febSDavid Sterba #endif 5246e369febSDavid Sterba 5256ab0a202SJeff Mahoney static ssize_t btrfs_show_u64(u64 *value_ptr, spinlock_t *lock, char *buf) 5266ab0a202SJeff Mahoney { 5276ab0a202SJeff Mahoney u64 val; 5286ab0a202SJeff Mahoney if (lock) 5296ab0a202SJeff Mahoney spin_lock(lock); 5306ab0a202SJeff Mahoney val = *value_ptr; 5316ab0a202SJeff Mahoney if (lock) 5326ab0a202SJeff Mahoney spin_unlock(lock); 5336ab0a202SJeff Mahoney return snprintf(buf, PAGE_SIZE, "%llu\n", val); 5346ab0a202SJeff Mahoney } 5356ab0a202SJeff Mahoney 5366ab0a202SJeff Mahoney static ssize_t global_rsv_size_show(struct kobject *kobj, 5376ab0a202SJeff Mahoney struct kobj_attribute *ka, char *buf) 5386ab0a202SJeff Mahoney { 5396ab0a202SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); 5406ab0a202SJeff Mahoney struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 5416ab0a202SJeff Mahoney return btrfs_show_u64(&block_rsv->size, &block_rsv->lock, buf); 5426ab0a202SJeff Mahoney } 543a969f4ccSHans van Kranenburg BTRFS_ATTR(allocation, global_rsv_size, global_rsv_size_show); 5446ab0a202SJeff Mahoney 5456ab0a202SJeff Mahoney static ssize_t global_rsv_reserved_show(struct kobject *kobj, 5466ab0a202SJeff Mahoney struct kobj_attribute *a, char *buf) 5476ab0a202SJeff Mahoney { 5486ab0a202SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); 5496ab0a202SJeff Mahoney struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 5506ab0a202SJeff Mahoney return btrfs_show_u64(&block_rsv->reserved, &block_rsv->lock, buf); 5516ab0a202SJeff Mahoney } 552a969f4ccSHans van Kranenburg BTRFS_ATTR(allocation, global_rsv_reserved, global_rsv_reserved_show); 5536ab0a202SJeff Mahoney 5546ab0a202SJeff Mahoney #define to_space_info(_kobj) container_of(_kobj, struct btrfs_space_info, kobj) 555c1895442SJeff Mahoney #define to_raid_kobj(_kobj) container_of(_kobj, struct raid_kobject, kobj) 5566ab0a202SJeff Mahoney 5576ab0a202SJeff Mahoney static ssize_t raid_bytes_show(struct kobject *kobj, 5586ab0a202SJeff Mahoney struct kobj_attribute *attr, char *buf); 559a969f4ccSHans van Kranenburg BTRFS_ATTR(raid, total_bytes, raid_bytes_show); 560a969f4ccSHans van Kranenburg BTRFS_ATTR(raid, used_bytes, raid_bytes_show); 5616ab0a202SJeff Mahoney 5626ab0a202SJeff Mahoney static ssize_t raid_bytes_show(struct kobject *kobj, 5636ab0a202SJeff Mahoney struct kobj_attribute *attr, char *buf) 5646ab0a202SJeff Mahoney 5656ab0a202SJeff Mahoney { 5666ab0a202SJeff Mahoney struct btrfs_space_info *sinfo = to_space_info(kobj->parent); 56732da5386SDavid Sterba struct btrfs_block_group *block_group; 56875cb379dSJeff Mahoney int index = btrfs_bg_flags_to_raid_index(to_raid_kobj(kobj)->flags); 5696ab0a202SJeff Mahoney u64 val = 0; 5706ab0a202SJeff Mahoney 5716ab0a202SJeff Mahoney down_read(&sinfo->groups_sem); 5726ab0a202SJeff Mahoney list_for_each_entry(block_group, &sinfo->block_groups[index], list) { 573a969f4ccSHans van Kranenburg if (&attr->attr == BTRFS_ATTR_PTR(raid, total_bytes)) 574b3470b5dSDavid Sterba val += block_group->length; 5756ab0a202SJeff Mahoney else 576bf38be65SDavid Sterba val += block_group->used; 5776ab0a202SJeff Mahoney } 5786ab0a202SJeff Mahoney up_read(&sinfo->groups_sem); 5796ab0a202SJeff Mahoney return snprintf(buf, PAGE_SIZE, "%llu\n", val); 5806ab0a202SJeff Mahoney } 5816ab0a202SJeff Mahoney 5827c7e3014SKimberly Brown static struct attribute *raid_attrs[] = { 583a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(raid, total_bytes), 584a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(raid, used_bytes), 5856ab0a202SJeff Mahoney NULL 5866ab0a202SJeff Mahoney }; 5877c7e3014SKimberly Brown ATTRIBUTE_GROUPS(raid); 5886ab0a202SJeff Mahoney 5896ab0a202SJeff Mahoney static void release_raid_kobj(struct kobject *kobj) 5906ab0a202SJeff Mahoney { 591c1895442SJeff Mahoney kfree(to_raid_kobj(kobj)); 5926ab0a202SJeff Mahoney } 5936ab0a202SJeff Mahoney 594536ea45cSDavid Sterba static struct kobj_type btrfs_raid_ktype = { 5956ab0a202SJeff Mahoney .sysfs_ops = &kobj_sysfs_ops, 5966ab0a202SJeff Mahoney .release = release_raid_kobj, 5977c7e3014SKimberly Brown .default_groups = raid_groups, 5986ab0a202SJeff Mahoney }; 5996ab0a202SJeff Mahoney 6006ab0a202SJeff Mahoney #define SPACE_INFO_ATTR(field) \ 6016ab0a202SJeff Mahoney static ssize_t btrfs_space_info_show_##field(struct kobject *kobj, \ 6026ab0a202SJeff Mahoney struct kobj_attribute *a, \ 6036ab0a202SJeff Mahoney char *buf) \ 6046ab0a202SJeff Mahoney { \ 6056ab0a202SJeff Mahoney struct btrfs_space_info *sinfo = to_space_info(kobj); \ 6066ab0a202SJeff Mahoney return btrfs_show_u64(&sinfo->field, &sinfo->lock, buf); \ 6076ab0a202SJeff Mahoney } \ 608a969f4ccSHans van Kranenburg BTRFS_ATTR(space_info, field, btrfs_space_info_show_##field) 6096ab0a202SJeff Mahoney 6106ab0a202SJeff Mahoney static ssize_t btrfs_space_info_show_total_bytes_pinned(struct kobject *kobj, 6116ab0a202SJeff Mahoney struct kobj_attribute *a, 6126ab0a202SJeff Mahoney char *buf) 6136ab0a202SJeff Mahoney { 6146ab0a202SJeff Mahoney struct btrfs_space_info *sinfo = to_space_info(kobj); 6156ab0a202SJeff Mahoney s64 val = percpu_counter_sum(&sinfo->total_bytes_pinned); 6166ab0a202SJeff Mahoney return snprintf(buf, PAGE_SIZE, "%lld\n", val); 6176ab0a202SJeff Mahoney } 6186ab0a202SJeff Mahoney 6196ab0a202SJeff Mahoney SPACE_INFO_ATTR(flags); 6206ab0a202SJeff Mahoney SPACE_INFO_ATTR(total_bytes); 6216ab0a202SJeff Mahoney SPACE_INFO_ATTR(bytes_used); 6226ab0a202SJeff Mahoney SPACE_INFO_ATTR(bytes_pinned); 6236ab0a202SJeff Mahoney SPACE_INFO_ATTR(bytes_reserved); 6246ab0a202SJeff Mahoney SPACE_INFO_ATTR(bytes_may_use); 625c1fd5c30SWang Xiaoguang SPACE_INFO_ATTR(bytes_readonly); 6266ab0a202SJeff Mahoney SPACE_INFO_ATTR(disk_used); 6276ab0a202SJeff Mahoney SPACE_INFO_ATTR(disk_total); 628a969f4ccSHans van Kranenburg BTRFS_ATTR(space_info, total_bytes_pinned, 629a969f4ccSHans van Kranenburg btrfs_space_info_show_total_bytes_pinned); 6306ab0a202SJeff Mahoney 6316ab0a202SJeff Mahoney static struct attribute *space_info_attrs[] = { 632a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, flags), 633a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, total_bytes), 634a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, bytes_used), 635a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, bytes_pinned), 636a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, bytes_reserved), 637a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, bytes_may_use), 638a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, bytes_readonly), 639a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, disk_used), 640a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, disk_total), 641a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, total_bytes_pinned), 6426ab0a202SJeff Mahoney NULL, 6436ab0a202SJeff Mahoney }; 6447c7e3014SKimberly Brown ATTRIBUTE_GROUPS(space_info); 6456ab0a202SJeff Mahoney 6466ab0a202SJeff Mahoney static void space_info_release(struct kobject *kobj) 6476ab0a202SJeff Mahoney { 6486ab0a202SJeff Mahoney struct btrfs_space_info *sinfo = to_space_info(kobj); 6496ab0a202SJeff Mahoney percpu_counter_destroy(&sinfo->total_bytes_pinned); 6506ab0a202SJeff Mahoney kfree(sinfo); 6516ab0a202SJeff Mahoney } 6526ab0a202SJeff Mahoney 65327992d01SDavid Sterba static struct kobj_type space_info_ktype = { 6546ab0a202SJeff Mahoney .sysfs_ops = &kobj_sysfs_ops, 6556ab0a202SJeff Mahoney .release = space_info_release, 6567c7e3014SKimberly Brown .default_groups = space_info_groups, 6576ab0a202SJeff Mahoney }; 6586ab0a202SJeff Mahoney 6596ab0a202SJeff Mahoney static const struct attribute *allocation_attrs[] = { 660a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(allocation, global_rsv_reserved), 661a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(allocation, global_rsv_size), 6626ab0a202SJeff Mahoney NULL, 6636ab0a202SJeff Mahoney }; 6646ab0a202SJeff Mahoney 665f8ba9c11SJeff Mahoney static ssize_t btrfs_label_show(struct kobject *kobj, 666f8ba9c11SJeff Mahoney struct kobj_attribute *a, char *buf) 667f8ba9c11SJeff Mahoney { 668f8ba9c11SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj); 66948fcc3ffSSatoru Takeuchi char *label = fs_info->super_copy->label; 670ee17fc80SDavid Sterba ssize_t ret; 671ee17fc80SDavid Sterba 672ee17fc80SDavid Sterba spin_lock(&fs_info->super_lock); 673ee17fc80SDavid Sterba ret = snprintf(buf, PAGE_SIZE, label[0] ? "%s\n" : "%s", label); 674ee17fc80SDavid Sterba spin_unlock(&fs_info->super_lock); 675ee17fc80SDavid Sterba 676ee17fc80SDavid Sterba return ret; 677f8ba9c11SJeff Mahoney } 678f8ba9c11SJeff Mahoney 679f8ba9c11SJeff Mahoney static ssize_t btrfs_label_store(struct kobject *kobj, 680f8ba9c11SJeff Mahoney struct kobj_attribute *a, 681f8ba9c11SJeff Mahoney const char *buf, size_t len) 682f8ba9c11SJeff Mahoney { 683f8ba9c11SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj); 68448fcc3ffSSatoru Takeuchi size_t p_len; 685f8ba9c11SJeff Mahoney 68666ac9fe7SDavid Sterba if (!fs_info) 68766ac9fe7SDavid Sterba return -EPERM; 68866ac9fe7SDavid Sterba 689bc98a42cSDavid Howells if (sb_rdonly(fs_info->sb)) 69079aec2b8SAnand Jain return -EROFS; 69179aec2b8SAnand Jain 69248fcc3ffSSatoru Takeuchi /* 69348fcc3ffSSatoru Takeuchi * p_len is the len until the first occurrence of either 69448fcc3ffSSatoru Takeuchi * '\n' or '\0' 69548fcc3ffSSatoru Takeuchi */ 69648fcc3ffSSatoru Takeuchi p_len = strcspn(buf, "\n"); 69748fcc3ffSSatoru Takeuchi 69848fcc3ffSSatoru Takeuchi if (p_len >= BTRFS_LABEL_SIZE) 699f8ba9c11SJeff Mahoney return -EINVAL; 700f8ba9c11SJeff Mahoney 701a6f69dc8SDavid Sterba spin_lock(&fs_info->super_lock); 70248fcc3ffSSatoru Takeuchi memset(fs_info->super_copy->label, 0, BTRFS_LABEL_SIZE); 70348fcc3ffSSatoru Takeuchi memcpy(fs_info->super_copy->label, buf, p_len); 704a6f69dc8SDavid Sterba spin_unlock(&fs_info->super_lock); 705f8ba9c11SJeff Mahoney 706a6f69dc8SDavid Sterba /* 707a6f69dc8SDavid Sterba * We don't want to do full transaction commit from inside sysfs 708a6f69dc8SDavid Sterba */ 709a6f69dc8SDavid Sterba btrfs_set_pending(fs_info, COMMIT); 710a6f69dc8SDavid Sterba wake_up_process(fs_info->transaction_kthread); 711a6f69dc8SDavid Sterba 712f8ba9c11SJeff Mahoney return len; 713f8ba9c11SJeff Mahoney } 714a969f4ccSHans van Kranenburg BTRFS_ATTR_RW(, label, btrfs_label_show, btrfs_label_store); 715f8ba9c11SJeff Mahoney 716df93589aSDavid Sterba static ssize_t btrfs_nodesize_show(struct kobject *kobj, 717df93589aSDavid Sterba struct kobj_attribute *a, char *buf) 718df93589aSDavid Sterba { 719df93589aSDavid Sterba struct btrfs_fs_info *fs_info = to_fs_info(kobj); 720df93589aSDavid Sterba 721093e037cSDavid Sterba return snprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->nodesize); 722df93589aSDavid Sterba } 723df93589aSDavid Sterba 724a969f4ccSHans van Kranenburg BTRFS_ATTR(, nodesize, btrfs_nodesize_show); 725df93589aSDavid Sterba 726df93589aSDavid Sterba static ssize_t btrfs_sectorsize_show(struct kobject *kobj, 727df93589aSDavid Sterba struct kobj_attribute *a, char *buf) 728df93589aSDavid Sterba { 729df93589aSDavid Sterba struct btrfs_fs_info *fs_info = to_fs_info(kobj); 730df93589aSDavid Sterba 731093e037cSDavid Sterba return snprintf(buf, PAGE_SIZE, "%u\n", 732093e037cSDavid Sterba fs_info->super_copy->sectorsize); 733df93589aSDavid Sterba } 734df93589aSDavid Sterba 735a969f4ccSHans van Kranenburg BTRFS_ATTR(, sectorsize, btrfs_sectorsize_show); 736df93589aSDavid Sterba 737df93589aSDavid Sterba static ssize_t btrfs_clone_alignment_show(struct kobject *kobj, 738df93589aSDavid Sterba struct kobj_attribute *a, char *buf) 739df93589aSDavid Sterba { 740df93589aSDavid Sterba struct btrfs_fs_info *fs_info = to_fs_info(kobj); 741df93589aSDavid Sterba 742093e037cSDavid Sterba return snprintf(buf, PAGE_SIZE, "%u\n", 743093e037cSDavid Sterba fs_info->super_copy->sectorsize); 744df93589aSDavid Sterba } 745df93589aSDavid Sterba 746a969f4ccSHans van Kranenburg BTRFS_ATTR(, clone_alignment, btrfs_clone_alignment_show); 747df93589aSDavid Sterba 7482723480aSSargun Dhillon static ssize_t quota_override_show(struct kobject *kobj, 7492723480aSSargun Dhillon struct kobj_attribute *a, char *buf) 7502723480aSSargun Dhillon { 7512723480aSSargun Dhillon struct btrfs_fs_info *fs_info = to_fs_info(kobj); 7522723480aSSargun Dhillon int quota_override; 7532723480aSSargun Dhillon 7542723480aSSargun Dhillon quota_override = test_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags); 7552723480aSSargun Dhillon return snprintf(buf, PAGE_SIZE, "%d\n", quota_override); 7562723480aSSargun Dhillon } 7572723480aSSargun Dhillon 7582723480aSSargun Dhillon static ssize_t quota_override_store(struct kobject *kobj, 7592723480aSSargun Dhillon struct kobj_attribute *a, 7602723480aSSargun Dhillon const char *buf, size_t len) 7612723480aSSargun Dhillon { 7622723480aSSargun Dhillon struct btrfs_fs_info *fs_info = to_fs_info(kobj); 7632723480aSSargun Dhillon unsigned long knob; 7642723480aSSargun Dhillon int err; 7652723480aSSargun Dhillon 7662723480aSSargun Dhillon if (!fs_info) 7672723480aSSargun Dhillon return -EPERM; 7682723480aSSargun Dhillon 7692723480aSSargun Dhillon if (!capable(CAP_SYS_RESOURCE)) 7702723480aSSargun Dhillon return -EPERM; 7712723480aSSargun Dhillon 7722723480aSSargun Dhillon err = kstrtoul(buf, 10, &knob); 7732723480aSSargun Dhillon if (err) 7742723480aSSargun Dhillon return err; 7752723480aSSargun Dhillon if (knob > 1) 7762723480aSSargun Dhillon return -EINVAL; 7772723480aSSargun Dhillon 7782723480aSSargun Dhillon if (knob) 7792723480aSSargun Dhillon set_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags); 7802723480aSSargun Dhillon else 7812723480aSSargun Dhillon clear_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags); 7822723480aSSargun Dhillon 7832723480aSSargun Dhillon return len; 7842723480aSSargun Dhillon } 7852723480aSSargun Dhillon 786a969f4ccSHans van Kranenburg BTRFS_ATTR_RW(, quota_override, quota_override_show, quota_override_store); 7872723480aSSargun Dhillon 78856f20f40SNikolay Borisov static ssize_t btrfs_metadata_uuid_show(struct kobject *kobj, 78956f20f40SNikolay Borisov struct kobj_attribute *a, char *buf) 79056f20f40SNikolay Borisov { 79156f20f40SNikolay Borisov struct btrfs_fs_info *fs_info = to_fs_info(kobj); 79256f20f40SNikolay Borisov 79356f20f40SNikolay Borisov return snprintf(buf, PAGE_SIZE, "%pU\n", 79456f20f40SNikolay Borisov fs_info->fs_devices->metadata_uuid); 79556f20f40SNikolay Borisov } 79656f20f40SNikolay Borisov 79756f20f40SNikolay Borisov BTRFS_ATTR(, metadata_uuid, btrfs_metadata_uuid_show); 79856f20f40SNikolay Borisov 79941e6d2a8SJohannes Thumshirn static ssize_t btrfs_checksum_show(struct kobject *kobj, 80041e6d2a8SJohannes Thumshirn struct kobj_attribute *a, char *buf) 80141e6d2a8SJohannes Thumshirn { 80241e6d2a8SJohannes Thumshirn struct btrfs_fs_info *fs_info = to_fs_info(kobj); 80341e6d2a8SJohannes Thumshirn u16 csum_type = btrfs_super_csum_type(fs_info->super_copy); 80441e6d2a8SJohannes Thumshirn 80541e6d2a8SJohannes Thumshirn return snprintf(buf, PAGE_SIZE, "%s (%s)\n", 80641e6d2a8SJohannes Thumshirn btrfs_super_csum_name(csum_type), 80741e6d2a8SJohannes Thumshirn crypto_shash_driver_name(fs_info->csum_shash)); 80841e6d2a8SJohannes Thumshirn } 80941e6d2a8SJohannes Thumshirn 81041e6d2a8SJohannes Thumshirn BTRFS_ATTR(, checksum, btrfs_checksum_show); 81141e6d2a8SJohannes Thumshirn 8120dd2906fSAnand Jain static const struct attribute *btrfs_attrs[] = { 813a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(, label), 814a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(, nodesize), 815a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(, sectorsize), 816a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(, clone_alignment), 817a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(, quota_override), 81856f20f40SNikolay Borisov BTRFS_ATTR_PTR(, metadata_uuid), 81941e6d2a8SJohannes Thumshirn BTRFS_ATTR_PTR(, checksum), 820f8ba9c11SJeff Mahoney NULL, 821f8ba9c11SJeff Mahoney }; 822f8ba9c11SJeff Mahoney 823c1b7e474SAnand Jain static void btrfs_release_fsid_kobj(struct kobject *kobj) 824510d7360SJeff Mahoney { 8252e7910d6SAnand Jain struct btrfs_fs_devices *fs_devs = to_fs_devs(kobj); 826248d200dSAnand Jain 827c1b7e474SAnand Jain memset(&fs_devs->fsid_kobj, 0, sizeof(struct kobject)); 8282e7910d6SAnand Jain complete(&fs_devs->kobj_unregister); 829510d7360SJeff Mahoney } 830510d7360SJeff Mahoney 831510d7360SJeff Mahoney static struct kobj_type btrfs_ktype = { 832510d7360SJeff Mahoney .sysfs_ops = &kobj_sysfs_ops, 833c1b7e474SAnand Jain .release = btrfs_release_fsid_kobj, 834510d7360SJeff Mahoney }; 835510d7360SJeff Mahoney 8362e7910d6SAnand Jain static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj) 8372e7910d6SAnand Jain { 8382e7910d6SAnand Jain if (kobj->ktype != &btrfs_ktype) 8392e7910d6SAnand Jain return NULL; 840c1b7e474SAnand Jain return container_of(kobj, struct btrfs_fs_devices, fsid_kobj); 8412e7910d6SAnand Jain } 8422e7910d6SAnand Jain 843510d7360SJeff Mahoney static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj) 844510d7360SJeff Mahoney { 845510d7360SJeff Mahoney if (kobj->ktype != &btrfs_ktype) 846510d7360SJeff Mahoney return NULL; 8472e7910d6SAnand Jain return to_fs_devs(kobj)->fs_info; 848510d7360SJeff Mahoney } 84958176a96SJosef Bacik 850e453d989SJeff Mahoney #define NUM_FEATURE_BITS 64 8516c52157fSTomohiro Misono #define BTRFS_FEATURE_NAME_MAX 13 8526c52157fSTomohiro Misono static char btrfs_unknown_feature_names[FEAT_MAX][NUM_FEATURE_BITS][BTRFS_FEATURE_NAME_MAX]; 8536c52157fSTomohiro Misono static struct btrfs_feature_attr btrfs_feature_attrs[FEAT_MAX][NUM_FEATURE_BITS]; 854e453d989SJeff Mahoney 8556c52157fSTomohiro Misono static const u64 supported_feature_masks[FEAT_MAX] = { 856e453d989SJeff Mahoney [FEAT_COMPAT] = BTRFS_FEATURE_COMPAT_SUPP, 857e453d989SJeff Mahoney [FEAT_COMPAT_RO] = BTRFS_FEATURE_COMPAT_RO_SUPP, 858e453d989SJeff Mahoney [FEAT_INCOMPAT] = BTRFS_FEATURE_INCOMPAT_SUPP, 859e453d989SJeff Mahoney }; 860e453d989SJeff Mahoney 861e453d989SJeff Mahoney static int addrm_unknown_feature_attrs(struct btrfs_fs_info *fs_info, bool add) 8625ac1d209SJeff Mahoney { 863e453d989SJeff Mahoney int set; 864e453d989SJeff Mahoney 865e453d989SJeff Mahoney for (set = 0; set < FEAT_MAX; set++) { 866e453d989SJeff Mahoney int i; 867e453d989SJeff Mahoney struct attribute *attrs[2]; 868e453d989SJeff Mahoney struct attribute_group agroup = { 869e453d989SJeff Mahoney .name = "features", 870e453d989SJeff Mahoney .attrs = attrs, 871e453d989SJeff Mahoney }; 872e453d989SJeff Mahoney u64 features = get_features(fs_info, set); 873e453d989SJeff Mahoney features &= ~supported_feature_masks[set]; 874e453d989SJeff Mahoney 875e453d989SJeff Mahoney if (!features) 876e453d989SJeff Mahoney continue; 877e453d989SJeff Mahoney 878e453d989SJeff Mahoney attrs[1] = NULL; 879e453d989SJeff Mahoney for (i = 0; i < NUM_FEATURE_BITS; i++) { 880e453d989SJeff Mahoney struct btrfs_feature_attr *fa; 881e453d989SJeff Mahoney 882e453d989SJeff Mahoney if (!(features & (1ULL << i))) 883e453d989SJeff Mahoney continue; 884e453d989SJeff Mahoney 885e453d989SJeff Mahoney fa = &btrfs_feature_attrs[set][i]; 886e453d989SJeff Mahoney attrs[0] = &fa->kobj_attr.attr; 887e453d989SJeff Mahoney if (add) { 888e453d989SJeff Mahoney int ret; 889c1b7e474SAnand Jain ret = sysfs_merge_group(&fs_info->fs_devices->fsid_kobj, 890e453d989SJeff Mahoney &agroup); 891e453d989SJeff Mahoney if (ret) 892e453d989SJeff Mahoney return ret; 893e453d989SJeff Mahoney } else 894c1b7e474SAnand Jain sysfs_unmerge_group(&fs_info->fs_devices->fsid_kobj, 895e453d989SJeff Mahoney &agroup); 896e453d989SJeff Mahoney } 897e453d989SJeff Mahoney 898e453d989SJeff Mahoney } 899e453d989SJeff Mahoney return 0; 900e453d989SJeff Mahoney } 901e453d989SJeff Mahoney 9022e3e1281SAnand Jain static void __btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs) 903e453d989SJeff Mahoney { 904a013d141SAnand Jain if (fs_devs->devinfo_kobj) { 905a013d141SAnand Jain kobject_del(fs_devs->devinfo_kobj); 906a013d141SAnand Jain kobject_put(fs_devs->devinfo_kobj); 907a013d141SAnand Jain fs_devs->devinfo_kobj = NULL; 908a013d141SAnand Jain } 909a013d141SAnand Jain 910b5501504SAnand Jain if (fs_devs->devices_kobj) { 911b5501504SAnand Jain kobject_del(fs_devs->devices_kobj); 912b5501504SAnand Jain kobject_put(fs_devs->devices_kobj); 913b5501504SAnand Jain fs_devs->devices_kobj = NULL; 914aaf13305SAnand Jain } 915aaf13305SAnand Jain 916c1b7e474SAnand Jain if (fs_devs->fsid_kobj.state_initialized) { 917c1b7e474SAnand Jain kobject_del(&fs_devs->fsid_kobj); 918c1b7e474SAnand Jain kobject_put(&fs_devs->fsid_kobj); 9192e7910d6SAnand Jain wait_for_completion(&fs_devs->kobj_unregister); 9205ac1d209SJeff Mahoney } 921f90fc547SAnand Jain } 9225ac1d209SJeff Mahoney 9232e3e1281SAnand Jain /* when fs_devs is NULL it will remove all fsid kobject */ 9241d1c1be3SAnand Jain void btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs) 9252e3e1281SAnand Jain { 9262e3e1281SAnand Jain struct list_head *fs_uuids = btrfs_get_fs_uuids(); 9272e3e1281SAnand Jain 9282e3e1281SAnand Jain if (fs_devs) { 9292e3e1281SAnand Jain __btrfs_sysfs_remove_fsid(fs_devs); 9302e3e1281SAnand Jain return; 9312e3e1281SAnand Jain } 9322e3e1281SAnand Jain 933c4babc5eSAnand Jain list_for_each_entry(fs_devs, fs_uuids, fs_list) { 9342e3e1281SAnand Jain __btrfs_sysfs_remove_fsid(fs_devs); 9352e3e1281SAnand Jain } 9362e3e1281SAnand Jain } 9372e3e1281SAnand Jain 9386618a59bSAnand Jain void btrfs_sysfs_remove_mounted(struct btrfs_fs_info *fs_info) 939e453d989SJeff Mahoney { 9405a13f430SAnand Jain btrfs_reset_fs_info_ptr(fs_info); 9415a13f430SAnand Jain 942e453d989SJeff Mahoney if (fs_info->space_info_kobj) { 943e453d989SJeff Mahoney sysfs_remove_files(fs_info->space_info_kobj, allocation_attrs); 944e453d989SJeff Mahoney kobject_del(fs_info->space_info_kobj); 945e453d989SJeff Mahoney kobject_put(fs_info->space_info_kobj); 946e453d989SJeff Mahoney } 94771e8978eSDennis Zhou #ifdef CONFIG_BTRFS_DEBUG 948e4faab84SDennis Zhou if (fs_info->discard_debug_kobj) { 949e4faab84SDennis Zhou sysfs_remove_files(fs_info->discard_debug_kobj, 950e4faab84SDennis Zhou discard_debug_attrs); 951e4faab84SDennis Zhou kobject_del(fs_info->discard_debug_kobj); 952e4faab84SDennis Zhou kobject_put(fs_info->discard_debug_kobj); 953e4faab84SDennis Zhou } 95493945cb4SDennis Zhou if (fs_info->debug_kobj) { 95593945cb4SDennis Zhou sysfs_remove_files(fs_info->debug_kobj, btrfs_debug_mount_attrs); 95693945cb4SDennis Zhou kobject_del(fs_info->debug_kobj); 95793945cb4SDennis Zhou kobject_put(fs_info->debug_kobj); 95893945cb4SDennis Zhou } 95971e8978eSDennis Zhou #endif 960e453d989SJeff Mahoney addrm_unknown_feature_attrs(fs_info, false); 961c1b7e474SAnand Jain sysfs_remove_group(&fs_info->fs_devices->fsid_kobj, &btrfs_feature_attr_group); 962c1b7e474SAnand Jain sysfs_remove_files(&fs_info->fs_devices->fsid_kobj, btrfs_attrs); 963f3cd2c58SAnand Jain btrfs_sysfs_remove_devices_dir(fs_info->fs_devices, NULL); 964e453d989SJeff Mahoney } 965e453d989SJeff Mahoney 966f10152bcSDavid Sterba static const char * const btrfs_feature_set_names[FEAT_MAX] = { 96779da4fa4SJeff Mahoney [FEAT_COMPAT] = "compat", 96879da4fa4SJeff Mahoney [FEAT_COMPAT_RO] = "compat_ro", 96979da4fa4SJeff Mahoney [FEAT_INCOMPAT] = "incompat", 97079da4fa4SJeff Mahoney }; 97179da4fa4SJeff Mahoney 972f10152bcSDavid Sterba const char * const btrfs_feature_set_name(enum btrfs_feature_set set) 973f10152bcSDavid Sterba { 974f10152bcSDavid Sterba return btrfs_feature_set_names[set]; 975f10152bcSDavid Sterba } 976f10152bcSDavid Sterba 9773b02a68aSJeff Mahoney char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags) 9783b02a68aSJeff Mahoney { 9793b02a68aSJeff Mahoney size_t bufsize = 4096; /* safe max, 64 names * 64 bytes */ 9803b02a68aSJeff Mahoney int len = 0; 9813b02a68aSJeff Mahoney int i; 9823b02a68aSJeff Mahoney char *str; 9833b02a68aSJeff Mahoney 9843b02a68aSJeff Mahoney str = kmalloc(bufsize, GFP_KERNEL); 9853b02a68aSJeff Mahoney if (!str) 9863b02a68aSJeff Mahoney return str; 9873b02a68aSJeff Mahoney 9883b02a68aSJeff Mahoney for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { 9893b02a68aSJeff Mahoney const char *name; 9903b02a68aSJeff Mahoney 9913b02a68aSJeff Mahoney if (!(flags & (1ULL << i))) 9923b02a68aSJeff Mahoney continue; 9933b02a68aSJeff Mahoney 9943b02a68aSJeff Mahoney name = btrfs_feature_attrs[set][i].kobj_attr.attr.name; 9953b02a68aSJeff Mahoney len += snprintf(str + len, bufsize - len, "%s%s", 9963b02a68aSJeff Mahoney len ? "," : "", name); 9973b02a68aSJeff Mahoney } 9983b02a68aSJeff Mahoney 9993b02a68aSJeff Mahoney return str; 10003b02a68aSJeff Mahoney } 10013b02a68aSJeff Mahoney 100279da4fa4SJeff Mahoney static void init_feature_attrs(void) 100379da4fa4SJeff Mahoney { 100479da4fa4SJeff Mahoney struct btrfs_feature_attr *fa; 100579da4fa4SJeff Mahoney int set, i; 100679da4fa4SJeff Mahoney 100779da4fa4SJeff Mahoney BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names) != 100879da4fa4SJeff Mahoney ARRAY_SIZE(btrfs_feature_attrs)); 100979da4fa4SJeff Mahoney BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names[0]) != 101079da4fa4SJeff Mahoney ARRAY_SIZE(btrfs_feature_attrs[0])); 101179da4fa4SJeff Mahoney 10123b02a68aSJeff Mahoney memset(btrfs_feature_attrs, 0, sizeof(btrfs_feature_attrs)); 10133b02a68aSJeff Mahoney memset(btrfs_unknown_feature_names, 0, 10143b02a68aSJeff Mahoney sizeof(btrfs_unknown_feature_names)); 10153b02a68aSJeff Mahoney 101679da4fa4SJeff Mahoney for (i = 0; btrfs_supported_feature_attrs[i]; i++) { 101779da4fa4SJeff Mahoney struct btrfs_feature_attr *sfa; 101879da4fa4SJeff Mahoney struct attribute *a = btrfs_supported_feature_attrs[i]; 10193b02a68aSJeff Mahoney int bit; 102079da4fa4SJeff Mahoney sfa = attr_to_btrfs_feature_attr(a); 10213b02a68aSJeff Mahoney bit = ilog2(sfa->feature_bit); 10223b02a68aSJeff Mahoney fa = &btrfs_feature_attrs[sfa->feature_set][bit]; 102379da4fa4SJeff Mahoney 102479da4fa4SJeff Mahoney fa->kobj_attr.attr.name = sfa->kobj_attr.attr.name; 102579da4fa4SJeff Mahoney } 102679da4fa4SJeff Mahoney 102779da4fa4SJeff Mahoney for (set = 0; set < FEAT_MAX; set++) { 102879da4fa4SJeff Mahoney for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { 102979da4fa4SJeff Mahoney char *name = btrfs_unknown_feature_names[set][i]; 103079da4fa4SJeff Mahoney fa = &btrfs_feature_attrs[set][i]; 103179da4fa4SJeff Mahoney 103279da4fa4SJeff Mahoney if (fa->kobj_attr.attr.name) 103379da4fa4SJeff Mahoney continue; 103479da4fa4SJeff Mahoney 10356c52157fSTomohiro Misono snprintf(name, BTRFS_FEATURE_NAME_MAX, "%s:%u", 103679da4fa4SJeff Mahoney btrfs_feature_set_names[set], i); 103779da4fa4SJeff Mahoney 103879da4fa4SJeff Mahoney fa->kobj_attr.attr.name = name; 103979da4fa4SJeff Mahoney fa->kobj_attr.attr.mode = S_IRUGO; 104079da4fa4SJeff Mahoney fa->feature_set = set; 104179da4fa4SJeff Mahoney fa->feature_bit = 1ULL << i; 104279da4fa4SJeff Mahoney } 104379da4fa4SJeff Mahoney } 104479da4fa4SJeff Mahoney } 104579da4fa4SJeff Mahoney 104632a9991fSDavid Sterba /* 104732a9991fSDavid Sterba * Create a sysfs entry for a given block group type at path 104832a9991fSDavid Sterba * /sys/fs/btrfs/UUID/allocation/data/TYPE 104932a9991fSDavid Sterba */ 105032da5386SDavid Sterba void btrfs_sysfs_add_block_group_type(struct btrfs_block_group *cache) 105132a9991fSDavid Sterba { 105232a9991fSDavid Sterba struct btrfs_fs_info *fs_info = cache->fs_info; 105332a9991fSDavid Sterba struct btrfs_space_info *space_info = cache->space_info; 105432a9991fSDavid Sterba struct raid_kobject *rkobj; 105532a9991fSDavid Sterba const int index = btrfs_bg_flags_to_raid_index(cache->flags); 105632a9991fSDavid Sterba unsigned int nofs_flag; 105732a9991fSDavid Sterba int ret; 105832a9991fSDavid Sterba 105932a9991fSDavid Sterba /* 106032a9991fSDavid Sterba * Setup a NOFS context because kobject_add(), deep in its call chain, 106132a9991fSDavid Sterba * does GFP_KERNEL allocations, and we are often called in a context 106232a9991fSDavid Sterba * where if reclaim is triggered we can deadlock (we are either holding 106332a9991fSDavid Sterba * a transaction handle or some lock required for a transaction 106432a9991fSDavid Sterba * commit). 106532a9991fSDavid Sterba */ 106632a9991fSDavid Sterba nofs_flag = memalloc_nofs_save(); 106732a9991fSDavid Sterba 106832a9991fSDavid Sterba rkobj = kzalloc(sizeof(*rkobj), GFP_NOFS); 106932a9991fSDavid Sterba if (!rkobj) { 107032a9991fSDavid Sterba memalloc_nofs_restore(nofs_flag); 107132a9991fSDavid Sterba btrfs_warn(cache->fs_info, 107232a9991fSDavid Sterba "couldn't alloc memory for raid level kobject"); 107332a9991fSDavid Sterba return; 107432a9991fSDavid Sterba } 107532a9991fSDavid Sterba 107632a9991fSDavid Sterba rkobj->flags = cache->flags; 107732a9991fSDavid Sterba kobject_init(&rkobj->kobj, &btrfs_raid_ktype); 107832a9991fSDavid Sterba ret = kobject_add(&rkobj->kobj, &space_info->kobj, "%s", 107932a9991fSDavid Sterba btrfs_bg_type_to_raid_name(rkobj->flags)); 108032a9991fSDavid Sterba memalloc_nofs_restore(nofs_flag); 108132a9991fSDavid Sterba if (ret) { 108232a9991fSDavid Sterba kobject_put(&rkobj->kobj); 108332a9991fSDavid Sterba btrfs_warn(fs_info, 108432a9991fSDavid Sterba "failed to add kobject for block cache, ignoring"); 108532a9991fSDavid Sterba return; 108632a9991fSDavid Sterba } 108732a9991fSDavid Sterba 108832a9991fSDavid Sterba space_info->block_group_kobjs[index] = &rkobj->kobj; 108932a9991fSDavid Sterba } 109032a9991fSDavid Sterba 1091b5865babSDavid Sterba /* 1092b5865babSDavid Sterba * Remove sysfs directories for all block group types of a given space info and 1093b5865babSDavid Sterba * the space info as well 1094b5865babSDavid Sterba */ 1095b5865babSDavid Sterba void btrfs_sysfs_remove_space_info(struct btrfs_space_info *space_info) 1096b5865babSDavid Sterba { 1097b5865babSDavid Sterba int i; 1098b5865babSDavid Sterba 1099b5865babSDavid Sterba for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) { 1100b5865babSDavid Sterba struct kobject *kobj; 1101b5865babSDavid Sterba 1102b5865babSDavid Sterba kobj = space_info->block_group_kobjs[i]; 1103b5865babSDavid Sterba space_info->block_group_kobjs[i] = NULL; 1104b5865babSDavid Sterba if (kobj) { 1105b5865babSDavid Sterba kobject_del(kobj); 1106b5865babSDavid Sterba kobject_put(kobj); 1107b5865babSDavid Sterba } 1108b5865babSDavid Sterba } 1109b5865babSDavid Sterba kobject_del(&space_info->kobj); 1110b5865babSDavid Sterba kobject_put(&space_info->kobj); 1111b5865babSDavid Sterba } 1112b5865babSDavid Sterba 1113b882327aSDavid Sterba static const char *alloc_name(u64 flags) 1114b882327aSDavid Sterba { 1115b882327aSDavid Sterba switch (flags) { 1116b882327aSDavid Sterba case BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_DATA: 1117b882327aSDavid Sterba return "mixed"; 1118b882327aSDavid Sterba case BTRFS_BLOCK_GROUP_METADATA: 1119b882327aSDavid Sterba return "metadata"; 1120b882327aSDavid Sterba case BTRFS_BLOCK_GROUP_DATA: 1121b882327aSDavid Sterba return "data"; 1122b882327aSDavid Sterba case BTRFS_BLOCK_GROUP_SYSTEM: 1123b882327aSDavid Sterba return "system"; 1124b882327aSDavid Sterba default: 1125b882327aSDavid Sterba WARN_ON(1); 1126b882327aSDavid Sterba return "invalid-combination"; 1127b882327aSDavid Sterba }; 1128b882327aSDavid Sterba } 1129b882327aSDavid Sterba 1130b882327aSDavid Sterba /* 1131b882327aSDavid Sterba * Create a sysfs entry for a space info type at path 1132b882327aSDavid Sterba * /sys/fs/btrfs/UUID/allocation/TYPE 1133b882327aSDavid Sterba */ 1134b882327aSDavid Sterba int btrfs_sysfs_add_space_info_type(struct btrfs_fs_info *fs_info, 1135b882327aSDavid Sterba struct btrfs_space_info *space_info) 1136b882327aSDavid Sterba { 1137b882327aSDavid Sterba int ret; 1138b882327aSDavid Sterba 1139b882327aSDavid Sterba ret = kobject_init_and_add(&space_info->kobj, &space_info_ktype, 1140b882327aSDavid Sterba fs_info->space_info_kobj, "%s", 1141b882327aSDavid Sterba alloc_name(space_info->flags)); 1142b882327aSDavid Sterba if (ret) { 1143b882327aSDavid Sterba kobject_put(&space_info->kobj); 1144b882327aSDavid Sterba return ret; 1145b882327aSDavid Sterba } 1146b882327aSDavid Sterba 1147b882327aSDavid Sterba return 0; 1148b882327aSDavid Sterba } 1149b882327aSDavid Sterba 1150e7e1aa9cSAnand Jain /* when one_device is NULL, it removes all device links */ 1151e7e1aa9cSAnand Jain 1152f3cd2c58SAnand Jain int btrfs_sysfs_remove_devices_dir(struct btrfs_fs_devices *fs_devices, 115399994cdeSAnand Jain struct btrfs_device *one_device) 115499994cdeSAnand Jain { 115599994cdeSAnand Jain struct hd_struct *disk; 115699994cdeSAnand Jain struct kobject *disk_kobj; 115799994cdeSAnand Jain 1158b5501504SAnand Jain if (!fs_devices->devices_kobj) 115999994cdeSAnand Jain return -EINVAL; 116099994cdeSAnand Jain 1161668e48afSAnand Jain if (one_device) { 1162668e48afSAnand Jain if (one_device->bdev) { 116399994cdeSAnand Jain disk = one_device->bdev->bd_part; 116499994cdeSAnand Jain disk_kobj = &part_to_dev(disk)->kobj; 1165668e48afSAnand Jain sysfs_remove_link(fs_devices->devices_kobj, 1166668e48afSAnand Jain disk_kobj->name); 116799994cdeSAnand Jain } 116899994cdeSAnand Jain 1169668e48afSAnand Jain kobject_del(&one_device->devid_kobj); 1170668e48afSAnand Jain kobject_put(&one_device->devid_kobj); 1171e7e1aa9cSAnand Jain 1172668e48afSAnand Jain wait_for_completion(&one_device->kobj_unregister); 1173668e48afSAnand Jain 1174668e48afSAnand Jain return 0; 1175668e48afSAnand Jain } 1176668e48afSAnand Jain 1177668e48afSAnand Jain list_for_each_entry(one_device, &fs_devices->devices, dev_list) { 1178668e48afSAnand Jain 1179668e48afSAnand Jain if (one_device->bdev) { 1180e7e1aa9cSAnand Jain disk = one_device->bdev->bd_part; 1181e7e1aa9cSAnand Jain disk_kobj = &part_to_dev(disk)->kobj; 1182668e48afSAnand Jain sysfs_remove_link(fs_devices->devices_kobj, 1183668e48afSAnand Jain disk_kobj->name); 1184668e48afSAnand Jain } 1185668e48afSAnand Jain kobject_del(&one_device->devid_kobj); 1186668e48afSAnand Jain kobject_put(&one_device->devid_kobj); 1187e7e1aa9cSAnand Jain 1188668e48afSAnand Jain wait_for_completion(&one_device->kobj_unregister); 1189e7e1aa9cSAnand Jain } 1190e7e1aa9cSAnand Jain 119199994cdeSAnand Jain return 0; 119299994cdeSAnand Jain } 119399994cdeSAnand Jain 1194668e48afSAnand Jain static ssize_t btrfs_devinfo_in_fs_metadata_show(struct kobject *kobj, 1195668e48afSAnand Jain struct kobj_attribute *a, 1196668e48afSAnand Jain char *buf) 1197668e48afSAnand Jain { 1198668e48afSAnand Jain int val; 1199668e48afSAnand Jain struct btrfs_device *device = container_of(kobj, struct btrfs_device, 1200668e48afSAnand Jain devid_kobj); 1201668e48afSAnand Jain 1202668e48afSAnand Jain val = !!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &device->dev_state); 1203668e48afSAnand Jain 1204668e48afSAnand Jain return snprintf(buf, PAGE_SIZE, "%d\n", val); 1205668e48afSAnand Jain } 1206668e48afSAnand Jain BTRFS_ATTR(devid, in_fs_metadata, btrfs_devinfo_in_fs_metadata_show); 1207668e48afSAnand Jain 120825864778SAnand Jain static ssize_t btrfs_devinfo_missing_show(struct kobject *kobj, 1209668e48afSAnand Jain struct kobj_attribute *a, char *buf) 1210668e48afSAnand Jain { 1211668e48afSAnand Jain int val; 1212668e48afSAnand Jain struct btrfs_device *device = container_of(kobj, struct btrfs_device, 1213668e48afSAnand Jain devid_kobj); 1214668e48afSAnand Jain 1215668e48afSAnand Jain val = !!test_bit(BTRFS_DEV_STATE_MISSING, &device->dev_state); 1216668e48afSAnand Jain 1217668e48afSAnand Jain return snprintf(buf, PAGE_SIZE, "%d\n", val); 1218668e48afSAnand Jain } 121925864778SAnand Jain BTRFS_ATTR(devid, missing, btrfs_devinfo_missing_show); 1220668e48afSAnand Jain 1221668e48afSAnand Jain static ssize_t btrfs_devinfo_replace_target_show(struct kobject *kobj, 1222668e48afSAnand Jain struct kobj_attribute *a, 1223668e48afSAnand Jain char *buf) 1224668e48afSAnand Jain { 1225668e48afSAnand Jain int val; 1226668e48afSAnand Jain struct btrfs_device *device = container_of(kobj, struct btrfs_device, 1227668e48afSAnand Jain devid_kobj); 1228668e48afSAnand Jain 1229668e48afSAnand Jain val = !!test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state); 1230668e48afSAnand Jain 1231668e48afSAnand Jain return snprintf(buf, PAGE_SIZE, "%d\n", val); 1232668e48afSAnand Jain } 1233668e48afSAnand Jain BTRFS_ATTR(devid, replace_target, btrfs_devinfo_replace_target_show); 1234668e48afSAnand Jain 1235668e48afSAnand Jain static ssize_t btrfs_devinfo_writeable_show(struct kobject *kobj, 1236668e48afSAnand Jain struct kobj_attribute *a, char *buf) 1237668e48afSAnand Jain { 1238668e48afSAnand Jain int val; 1239668e48afSAnand Jain struct btrfs_device *device = container_of(kobj, struct btrfs_device, 1240668e48afSAnand Jain devid_kobj); 1241668e48afSAnand Jain 1242668e48afSAnand Jain val = !!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state); 1243668e48afSAnand Jain 1244668e48afSAnand Jain return snprintf(buf, PAGE_SIZE, "%d\n", val); 1245668e48afSAnand Jain } 1246668e48afSAnand Jain BTRFS_ATTR(devid, writeable, btrfs_devinfo_writeable_show); 1247668e48afSAnand Jain 1248668e48afSAnand Jain static struct attribute *devid_attrs[] = { 1249668e48afSAnand Jain BTRFS_ATTR_PTR(devid, in_fs_metadata), 1250668e48afSAnand Jain BTRFS_ATTR_PTR(devid, missing), 1251668e48afSAnand Jain BTRFS_ATTR_PTR(devid, replace_target), 1252668e48afSAnand Jain BTRFS_ATTR_PTR(devid, writeable), 1253668e48afSAnand Jain NULL 1254668e48afSAnand Jain }; 1255668e48afSAnand Jain ATTRIBUTE_GROUPS(devid); 1256668e48afSAnand Jain 1257668e48afSAnand Jain static void btrfs_release_devid_kobj(struct kobject *kobj) 1258668e48afSAnand Jain { 1259668e48afSAnand Jain struct btrfs_device *device = container_of(kobj, struct btrfs_device, 1260668e48afSAnand Jain devid_kobj); 1261668e48afSAnand Jain 1262668e48afSAnand Jain memset(&device->devid_kobj, 0, sizeof(struct kobject)); 1263668e48afSAnand Jain complete(&device->kobj_unregister); 1264668e48afSAnand Jain } 1265668e48afSAnand Jain 1266668e48afSAnand Jain static struct kobj_type devid_ktype = { 1267668e48afSAnand Jain .sysfs_ops = &kobj_sysfs_ops, 1268668e48afSAnand Jain .default_groups = devid_groups, 1269668e48afSAnand Jain .release = btrfs_release_devid_kobj, 1270668e48afSAnand Jain }; 1271668e48afSAnand Jain 1272f3cd2c58SAnand Jain int btrfs_sysfs_add_devices_dir(struct btrfs_fs_devices *fs_devices, 12730d39376aSAnand Jain struct btrfs_device *one_device) 127429e5be24SJeff Mahoney { 127529e5be24SJeff Mahoney int error = 0; 127629e5be24SJeff Mahoney struct btrfs_device *dev; 127729e5be24SJeff Mahoney 127829e5be24SJeff Mahoney list_for_each_entry(dev, &fs_devices->devices, dev_list) { 1279f085381eSAnand Jain 12800d39376aSAnand Jain if (one_device && one_device != dev) 12810d39376aSAnand Jain continue; 12820d39376aSAnand Jain 1283668e48afSAnand Jain if (dev->bdev) { 1284668e48afSAnand Jain struct hd_struct *disk; 1285668e48afSAnand Jain struct kobject *disk_kobj; 1286668e48afSAnand Jain 1287f085381eSAnand Jain disk = dev->bdev->bd_part; 1288f085381eSAnand Jain disk_kobj = &part_to_dev(disk)->kobj; 128929e5be24SJeff Mahoney 1290b5501504SAnand Jain error = sysfs_create_link(fs_devices->devices_kobj, 129129e5be24SJeff Mahoney disk_kobj, disk_kobj->name); 129229e5be24SJeff Mahoney if (error) 129329e5be24SJeff Mahoney break; 129429e5be24SJeff Mahoney } 129529e5be24SJeff Mahoney 1296668e48afSAnand Jain init_completion(&dev->kobj_unregister); 1297668e48afSAnand Jain error = kobject_init_and_add(&dev->devid_kobj, &devid_ktype, 12981b9867ebSAnand Jain fs_devices->devinfo_kobj, "%llu", 1299668e48afSAnand Jain dev->devid); 1300668e48afSAnand Jain if (error) { 1301668e48afSAnand Jain kobject_put(&dev->devid_kobj); 1302668e48afSAnand Jain break; 1303668e48afSAnand Jain } 1304668e48afSAnand Jain } 1305668e48afSAnand Jain 130629e5be24SJeff Mahoney return error; 130729e5be24SJeff Mahoney } 130829e5be24SJeff Mahoney 13095b28692eSDavid Sterba void btrfs_kobject_uevent(struct block_device *bdev, enum kobject_action action) 13105b28692eSDavid Sterba { 13115b28692eSDavid Sterba int ret; 13125b28692eSDavid Sterba 13135b28692eSDavid Sterba ret = kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, action); 13145b28692eSDavid Sterba if (ret) 13155b28692eSDavid Sterba pr_warn("BTRFS: Sending event '%d' to kobject: '%s' (%p): failed\n", 13165b28692eSDavid Sterba action, kobject_name(&disk_to_dev(bdev->bd_disk)->kobj), 13175b28692eSDavid Sterba &disk_to_dev(bdev->bd_disk)->kobj); 13185b28692eSDavid Sterba } 13195b28692eSDavid Sterba 1320f93c3997SDavid Sterba void btrfs_sysfs_update_sprout_fsid(struct btrfs_fs_devices *fs_devices, 1321f93c3997SDavid Sterba const u8 *fsid) 1322f93c3997SDavid Sterba { 1323f93c3997SDavid Sterba char fsid_buf[BTRFS_UUID_UNPARSED_SIZE]; 1324f93c3997SDavid Sterba 1325f93c3997SDavid Sterba /* 1326f93c3997SDavid Sterba * Sprouting changes fsid of the mounted filesystem, rename the fsid 1327f93c3997SDavid Sterba * directory 1328f93c3997SDavid Sterba */ 1329f93c3997SDavid Sterba snprintf(fsid_buf, BTRFS_UUID_UNPARSED_SIZE, "%pU", fsid); 1330f93c3997SDavid Sterba if (kobject_rename(&fs_devices->fsid_kobj, fsid_buf)) 1331f93c3997SDavid Sterba btrfs_warn(fs_devices->fs_info, 1332f93c3997SDavid Sterba "sysfs: failed to create fsid for sprout"); 1333f93c3997SDavid Sterba } 1334f93c3997SDavid Sterba 1335668e48afSAnand Jain void btrfs_sysfs_update_devid(struct btrfs_device *device) 1336668e48afSAnand Jain { 1337668e48afSAnand Jain char tmp[24]; 1338668e48afSAnand Jain 1339668e48afSAnand Jain snprintf(tmp, sizeof(tmp), "%llu", device->devid); 1340668e48afSAnand Jain 1341668e48afSAnand Jain if (kobject_rename(&device->devid_kobj, tmp)) 1342668e48afSAnand Jain btrfs_warn(device->fs_devices->fs_info, 1343668e48afSAnand Jain "sysfs: failed to update devid for %llu", 1344668e48afSAnand Jain device->devid); 1345668e48afSAnand Jain } 1346668e48afSAnand Jain 1347510d7360SJeff Mahoney /* /sys/fs/btrfs/ entry */ 1348510d7360SJeff Mahoney static struct kset *btrfs_kset; 1349510d7360SJeff Mahoney 135072059215SAnand Jain /* 1351c6761a9eSAnand Jain * Creates: 1352c6761a9eSAnand Jain * /sys/fs/btrfs/UUID 1353c6761a9eSAnand Jain * 135472059215SAnand Jain * Can be called by the device discovery thread. 135572059215SAnand Jain */ 1356c6761a9eSAnand Jain int btrfs_sysfs_add_fsid(struct btrfs_fs_devices *fs_devs) 13575ac1d209SJeff Mahoney { 13585ac1d209SJeff Mahoney int error; 13595ac1d209SJeff Mahoney 13602e7910d6SAnand Jain init_completion(&fs_devs->kobj_unregister); 1361c1b7e474SAnand Jain fs_devs->fsid_kobj.kset = btrfs_kset; 1362c6761a9eSAnand Jain error = kobject_init_and_add(&fs_devs->fsid_kobj, &btrfs_ktype, NULL, 1363c6761a9eSAnand Jain "%pU", fs_devs->fsid); 1364e3277335STobin C. Harding if (error) { 1365e3277335STobin C. Harding kobject_put(&fs_devs->fsid_kobj); 136672059215SAnand Jain return error; 136772059215SAnand Jain } 136872059215SAnand Jain 1369bc036bb3SAnand Jain fs_devs->devices_kobj = kobject_create_and_add("devices", 1370bc036bb3SAnand Jain &fs_devs->fsid_kobj); 1371bc036bb3SAnand Jain if (!fs_devs->devices_kobj) { 1372bc036bb3SAnand Jain btrfs_err(fs_devs->fs_info, 1373bc036bb3SAnand Jain "failed to init sysfs device interface"); 13741f6087e6SAnand Jain btrfs_sysfs_remove_fsid(fs_devs); 1375bc036bb3SAnand Jain return -ENOMEM; 1376bc036bb3SAnand Jain } 1377bc036bb3SAnand Jain 1378a013d141SAnand Jain fs_devs->devinfo_kobj = kobject_create_and_add("devinfo", 1379a013d141SAnand Jain &fs_devs->fsid_kobj); 1380a013d141SAnand Jain if (!fs_devs->devinfo_kobj) { 1381a013d141SAnand Jain btrfs_err(fs_devs->fs_info, 1382a013d141SAnand Jain "failed to init sysfs devinfo kobject"); 1383a013d141SAnand Jain btrfs_sysfs_remove_fsid(fs_devs); 1384a013d141SAnand Jain return -ENOMEM; 1385a013d141SAnand Jain } 1386a013d141SAnand Jain 1387e3277335STobin C. Harding return 0; 1388e3277335STobin C. Harding } 1389e3277335STobin C. Harding 139096f3136eSAnand Jain int btrfs_sysfs_add_mounted(struct btrfs_fs_info *fs_info) 139172059215SAnand Jain { 139272059215SAnand Jain int error; 13932e7910d6SAnand Jain struct btrfs_fs_devices *fs_devs = fs_info->fs_devices; 1394c1b7e474SAnand Jain struct kobject *fsid_kobj = &fs_devs->fsid_kobj; 139572059215SAnand Jain 13965a13f430SAnand Jain btrfs_set_fs_info_ptr(fs_info); 13975a13f430SAnand Jain 1398f3cd2c58SAnand Jain error = btrfs_sysfs_add_devices_dir(fs_devs, NULL); 1399e453d989SJeff Mahoney if (error) 1400e453d989SJeff Mahoney return error; 1401510d7360SJeff Mahoney 1402c1b7e474SAnand Jain error = sysfs_create_files(fsid_kobj, btrfs_attrs); 1403e453d989SJeff Mahoney if (error) { 1404f3cd2c58SAnand Jain btrfs_sysfs_remove_devices_dir(fs_devs, NULL); 1405e453d989SJeff Mahoney return error; 1406e453d989SJeff Mahoney } 140779da4fa4SJeff Mahoney 1408c1b7e474SAnand Jain error = sysfs_create_group(fsid_kobj, 14090dd2906fSAnand Jain &btrfs_feature_attr_group); 14100dd2906fSAnand Jain if (error) 14110dd2906fSAnand Jain goto failure; 14120dd2906fSAnand Jain 14136e369febSDavid Sterba #ifdef CONFIG_BTRFS_DEBUG 141493945cb4SDennis Zhou fs_info->debug_kobj = kobject_create_and_add("debug", fsid_kobj); 141593945cb4SDennis Zhou if (!fs_info->debug_kobj) { 141693945cb4SDennis Zhou error = -ENOMEM; 141793945cb4SDennis Zhou goto failure; 141893945cb4SDennis Zhou } 141993945cb4SDennis Zhou 142093945cb4SDennis Zhou error = sysfs_create_files(fs_info->debug_kobj, btrfs_debug_mount_attrs); 14216e369febSDavid Sterba if (error) 14226e369febSDavid Sterba goto failure; 1423e4faab84SDennis Zhou 1424e4faab84SDennis Zhou /* Discard directory */ 1425e4faab84SDennis Zhou fs_info->discard_debug_kobj = kobject_create_and_add("discard", 1426e4faab84SDennis Zhou fs_info->debug_kobj); 1427e4faab84SDennis Zhou if (!fs_info->discard_debug_kobj) { 1428e4faab84SDennis Zhou error = -ENOMEM; 1429e4faab84SDennis Zhou goto failure; 1430e4faab84SDennis Zhou } 1431e4faab84SDennis Zhou 1432e4faab84SDennis Zhou error = sysfs_create_files(fs_info->discard_debug_kobj, 1433e4faab84SDennis Zhou discard_debug_attrs); 1434e4faab84SDennis Zhou if (error) 1435e4faab84SDennis Zhou goto failure; 14366e369febSDavid Sterba #endif 14376e369febSDavid Sterba 1438e453d989SJeff Mahoney error = addrm_unknown_feature_attrs(fs_info, true); 143979da4fa4SJeff Mahoney if (error) 144079da4fa4SJeff Mahoney goto failure; 144179da4fa4SJeff Mahoney 14426ab0a202SJeff Mahoney fs_info->space_info_kobj = kobject_create_and_add("allocation", 1443c1b7e474SAnand Jain fsid_kobj); 14446ab0a202SJeff Mahoney if (!fs_info->space_info_kobj) { 14456ab0a202SJeff Mahoney error = -ENOMEM; 14466ab0a202SJeff Mahoney goto failure; 14476ab0a202SJeff Mahoney } 14486ab0a202SJeff Mahoney 14496ab0a202SJeff Mahoney error = sysfs_create_files(fs_info->space_info_kobj, allocation_attrs); 14506ab0a202SJeff Mahoney if (error) 14516ab0a202SJeff Mahoney goto failure; 14526ab0a202SJeff Mahoney 145379da4fa4SJeff Mahoney return 0; 145479da4fa4SJeff Mahoney failure: 14556618a59bSAnand Jain btrfs_sysfs_remove_mounted(fs_info); 14565ac1d209SJeff Mahoney return error; 14575ac1d209SJeff Mahoney } 14585ac1d209SJeff Mahoney 1459444e7516SDavid Sterba 1460444e7516SDavid Sterba /* 1461444e7516SDavid Sterba * Change per-fs features in /sys/fs/btrfs/UUID/features to match current 1462444e7516SDavid Sterba * values in superblock. Call after any changes to incompat/compat_ro flags 1463444e7516SDavid Sterba */ 1464444e7516SDavid Sterba void btrfs_sysfs_feature_update(struct btrfs_fs_info *fs_info, 1465444e7516SDavid Sterba u64 bit, enum btrfs_feature_set set) 1466444e7516SDavid Sterba { 1467444e7516SDavid Sterba struct btrfs_fs_devices *fs_devs; 1468444e7516SDavid Sterba struct kobject *fsid_kobj; 1469444e7516SDavid Sterba u64 features; 1470444e7516SDavid Sterba int ret; 1471444e7516SDavid Sterba 1472444e7516SDavid Sterba if (!fs_info) 1473444e7516SDavid Sterba return; 1474444e7516SDavid Sterba 1475444e7516SDavid Sterba features = get_features(fs_info, set); 1476444e7516SDavid Sterba ASSERT(bit & supported_feature_masks[set]); 1477444e7516SDavid Sterba 1478444e7516SDavid Sterba fs_devs = fs_info->fs_devices; 1479444e7516SDavid Sterba fsid_kobj = &fs_devs->fsid_kobj; 1480444e7516SDavid Sterba 1481bf609206SDavid Sterba if (!fsid_kobj->state_initialized) 1482bf609206SDavid Sterba return; 1483bf609206SDavid Sterba 1484444e7516SDavid Sterba /* 1485444e7516SDavid Sterba * FIXME: this is too heavy to update just one value, ideally we'd like 1486444e7516SDavid Sterba * to use sysfs_update_group but some refactoring is needed first. 1487444e7516SDavid Sterba */ 1488444e7516SDavid Sterba sysfs_remove_group(fsid_kobj, &btrfs_feature_attr_group); 1489444e7516SDavid Sterba ret = sysfs_create_group(fsid_kobj, &btrfs_feature_attr_group); 1490444e7516SDavid Sterba } 1491444e7516SDavid Sterba 1492f5c29bd9SLiu Bo int __init btrfs_init_sysfs(void) 149358176a96SJosef Bacik { 1494079b72bcSJeff Mahoney int ret; 14951bae3098SDavid Sterba 1496e3fe4e71SGreg KH btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj); 1497e3fe4e71SGreg KH if (!btrfs_kset) 1498e3fe4e71SGreg KH return -ENOMEM; 1499079b72bcSJeff Mahoney 15001bae3098SDavid Sterba init_feature_attrs(); 15011bae3098SDavid Sterba ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); 1502001a648dSFilipe Manana if (ret) 1503001a648dSFilipe Manana goto out2; 1504f902bd3aSMisono Tomohiro ret = sysfs_merge_group(&btrfs_kset->kobj, 1505f902bd3aSMisono Tomohiro &btrfs_static_feature_attr_group); 1506f902bd3aSMisono Tomohiro if (ret) 1507f902bd3aSMisono Tomohiro goto out_remove_group; 1508001a648dSFilipe Manana 15096e369febSDavid Sterba #ifdef CONFIG_BTRFS_DEBUG 15106e369febSDavid Sterba ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_debug_feature_attr_group); 15116e369febSDavid Sterba if (ret) 15126e369febSDavid Sterba goto out2; 15136e369febSDavid Sterba #endif 15146e369febSDavid Sterba 1515001a648dSFilipe Manana return 0; 1516f902bd3aSMisono Tomohiro 1517f902bd3aSMisono Tomohiro out_remove_group: 1518f902bd3aSMisono Tomohiro sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); 1519001a648dSFilipe Manana out2: 1520001a648dSFilipe Manana kset_unregister(btrfs_kset); 15211bae3098SDavid Sterba 15221bae3098SDavid Sterba return ret; 152358176a96SJosef Bacik } 152458176a96SJosef Bacik 1525e67c718bSDavid Sterba void __cold btrfs_exit_sysfs(void) 152658176a96SJosef Bacik { 1527f902bd3aSMisono Tomohiro sysfs_unmerge_group(&btrfs_kset->kobj, 1528f902bd3aSMisono Tomohiro &btrfs_static_feature_attr_group); 1529079b72bcSJeff Mahoney sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); 153071e8978eSDennis Zhou #ifdef CONFIG_BTRFS_DEBUG 153171e8978eSDennis Zhou sysfs_remove_group(&btrfs_kset->kobj, &btrfs_debug_feature_attr_group); 153271e8978eSDennis Zhou #endif 1533e3fe4e71SGreg KH kset_unregister(btrfs_kset); 153458176a96SJosef Bacik } 153555d47414SChris Mason 1536