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 347dfb79ddbSDennis Zhou static ssize_t btrfs_discardable_extents_show(struct kobject *kobj, 348dfb79ddbSDennis Zhou struct kobj_attribute *a, 349dfb79ddbSDennis Zhou char *buf) 350dfb79ddbSDennis Zhou { 351dfb79ddbSDennis Zhou struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 352dfb79ddbSDennis Zhou 353dfb79ddbSDennis Zhou return snprintf(buf, PAGE_SIZE, "%d\n", 354dfb79ddbSDennis Zhou atomic_read(&fs_info->discard_ctl.discardable_extents)); 355dfb79ddbSDennis Zhou } 356dfb79ddbSDennis Zhou BTRFS_ATTR(discard, discardable_extents, btrfs_discardable_extents_show); 357dfb79ddbSDennis Zhou 358e4faab84SDennis Zhou static const struct attribute *discard_debug_attrs[] = { 359dfb79ddbSDennis Zhou BTRFS_ATTR_PTR(discard, discardable_extents), 360e4faab84SDennis Zhou NULL, 361e4faab84SDennis Zhou }; 362e4faab84SDennis Zhou 363e4faab84SDennis Zhou /* 3646e369febSDavid Sterba * Runtime debugging exported via sysfs 3656e369febSDavid Sterba * 3666e369febSDavid Sterba * /sys/fs/btrfs/debug - applies to module or all filesystems 3676e369febSDavid Sterba * /sys/fs/btrfs/UUID - applies only to the given filesystem 3686e369febSDavid Sterba */ 36993945cb4SDennis Zhou static const struct attribute *btrfs_debug_mount_attrs[] = { 37093945cb4SDennis Zhou NULL, 37193945cb4SDennis Zhou }; 37293945cb4SDennis Zhou 3736e369febSDavid Sterba static struct attribute *btrfs_debug_feature_attrs[] = { 3746e369febSDavid Sterba NULL 3756e369febSDavid Sterba }; 3766e369febSDavid Sterba 3776e369febSDavid Sterba static const struct attribute_group btrfs_debug_feature_attr_group = { 3786e369febSDavid Sterba .name = "debug", 3796e369febSDavid Sterba .attrs = btrfs_debug_feature_attrs, 3806e369febSDavid Sterba }; 3816e369febSDavid Sterba 3826e369febSDavid Sterba #endif 3836e369febSDavid Sterba 3846ab0a202SJeff Mahoney static ssize_t btrfs_show_u64(u64 *value_ptr, spinlock_t *lock, char *buf) 3856ab0a202SJeff Mahoney { 3866ab0a202SJeff Mahoney u64 val; 3876ab0a202SJeff Mahoney if (lock) 3886ab0a202SJeff Mahoney spin_lock(lock); 3896ab0a202SJeff Mahoney val = *value_ptr; 3906ab0a202SJeff Mahoney if (lock) 3916ab0a202SJeff Mahoney spin_unlock(lock); 3926ab0a202SJeff Mahoney return snprintf(buf, PAGE_SIZE, "%llu\n", val); 3936ab0a202SJeff Mahoney } 3946ab0a202SJeff Mahoney 3956ab0a202SJeff Mahoney static ssize_t global_rsv_size_show(struct kobject *kobj, 3966ab0a202SJeff Mahoney struct kobj_attribute *ka, char *buf) 3976ab0a202SJeff Mahoney { 3986ab0a202SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); 3996ab0a202SJeff Mahoney struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 4006ab0a202SJeff Mahoney return btrfs_show_u64(&block_rsv->size, &block_rsv->lock, buf); 4016ab0a202SJeff Mahoney } 402a969f4ccSHans van Kranenburg BTRFS_ATTR(allocation, global_rsv_size, global_rsv_size_show); 4036ab0a202SJeff Mahoney 4046ab0a202SJeff Mahoney static ssize_t global_rsv_reserved_show(struct kobject *kobj, 4056ab0a202SJeff Mahoney struct kobj_attribute *a, char *buf) 4066ab0a202SJeff Mahoney { 4076ab0a202SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); 4086ab0a202SJeff Mahoney struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 4096ab0a202SJeff Mahoney return btrfs_show_u64(&block_rsv->reserved, &block_rsv->lock, buf); 4106ab0a202SJeff Mahoney } 411a969f4ccSHans van Kranenburg BTRFS_ATTR(allocation, global_rsv_reserved, global_rsv_reserved_show); 4126ab0a202SJeff Mahoney 4136ab0a202SJeff Mahoney #define to_space_info(_kobj) container_of(_kobj, struct btrfs_space_info, kobj) 414c1895442SJeff Mahoney #define to_raid_kobj(_kobj) container_of(_kobj, struct raid_kobject, kobj) 4156ab0a202SJeff Mahoney 4166ab0a202SJeff Mahoney static ssize_t raid_bytes_show(struct kobject *kobj, 4176ab0a202SJeff Mahoney struct kobj_attribute *attr, char *buf); 418a969f4ccSHans van Kranenburg BTRFS_ATTR(raid, total_bytes, raid_bytes_show); 419a969f4ccSHans van Kranenburg BTRFS_ATTR(raid, used_bytes, raid_bytes_show); 4206ab0a202SJeff Mahoney 4216ab0a202SJeff Mahoney static ssize_t raid_bytes_show(struct kobject *kobj, 4226ab0a202SJeff Mahoney struct kobj_attribute *attr, char *buf) 4236ab0a202SJeff Mahoney 4246ab0a202SJeff Mahoney { 4256ab0a202SJeff Mahoney struct btrfs_space_info *sinfo = to_space_info(kobj->parent); 42632da5386SDavid Sterba struct btrfs_block_group *block_group; 42775cb379dSJeff Mahoney int index = btrfs_bg_flags_to_raid_index(to_raid_kobj(kobj)->flags); 4286ab0a202SJeff Mahoney u64 val = 0; 4296ab0a202SJeff Mahoney 4306ab0a202SJeff Mahoney down_read(&sinfo->groups_sem); 4316ab0a202SJeff Mahoney list_for_each_entry(block_group, &sinfo->block_groups[index], list) { 432a969f4ccSHans van Kranenburg if (&attr->attr == BTRFS_ATTR_PTR(raid, total_bytes)) 433b3470b5dSDavid Sterba val += block_group->length; 4346ab0a202SJeff Mahoney else 435bf38be65SDavid Sterba val += block_group->used; 4366ab0a202SJeff Mahoney } 4376ab0a202SJeff Mahoney up_read(&sinfo->groups_sem); 4386ab0a202SJeff Mahoney return snprintf(buf, PAGE_SIZE, "%llu\n", val); 4396ab0a202SJeff Mahoney } 4406ab0a202SJeff Mahoney 4417c7e3014SKimberly Brown static struct attribute *raid_attrs[] = { 442a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(raid, total_bytes), 443a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(raid, used_bytes), 4446ab0a202SJeff Mahoney NULL 4456ab0a202SJeff Mahoney }; 4467c7e3014SKimberly Brown ATTRIBUTE_GROUPS(raid); 4476ab0a202SJeff Mahoney 4486ab0a202SJeff Mahoney static void release_raid_kobj(struct kobject *kobj) 4496ab0a202SJeff Mahoney { 450c1895442SJeff Mahoney kfree(to_raid_kobj(kobj)); 4516ab0a202SJeff Mahoney } 4526ab0a202SJeff Mahoney 453536ea45cSDavid Sterba static struct kobj_type btrfs_raid_ktype = { 4546ab0a202SJeff Mahoney .sysfs_ops = &kobj_sysfs_ops, 4556ab0a202SJeff Mahoney .release = release_raid_kobj, 4567c7e3014SKimberly Brown .default_groups = raid_groups, 4576ab0a202SJeff Mahoney }; 4586ab0a202SJeff Mahoney 4596ab0a202SJeff Mahoney #define SPACE_INFO_ATTR(field) \ 4606ab0a202SJeff Mahoney static ssize_t btrfs_space_info_show_##field(struct kobject *kobj, \ 4616ab0a202SJeff Mahoney struct kobj_attribute *a, \ 4626ab0a202SJeff Mahoney char *buf) \ 4636ab0a202SJeff Mahoney { \ 4646ab0a202SJeff Mahoney struct btrfs_space_info *sinfo = to_space_info(kobj); \ 4656ab0a202SJeff Mahoney return btrfs_show_u64(&sinfo->field, &sinfo->lock, buf); \ 4666ab0a202SJeff Mahoney } \ 467a969f4ccSHans van Kranenburg BTRFS_ATTR(space_info, field, btrfs_space_info_show_##field) 4686ab0a202SJeff Mahoney 4696ab0a202SJeff Mahoney static ssize_t btrfs_space_info_show_total_bytes_pinned(struct kobject *kobj, 4706ab0a202SJeff Mahoney struct kobj_attribute *a, 4716ab0a202SJeff Mahoney char *buf) 4726ab0a202SJeff Mahoney { 4736ab0a202SJeff Mahoney struct btrfs_space_info *sinfo = to_space_info(kobj); 4746ab0a202SJeff Mahoney s64 val = percpu_counter_sum(&sinfo->total_bytes_pinned); 4756ab0a202SJeff Mahoney return snprintf(buf, PAGE_SIZE, "%lld\n", val); 4766ab0a202SJeff Mahoney } 4776ab0a202SJeff Mahoney 4786ab0a202SJeff Mahoney SPACE_INFO_ATTR(flags); 4796ab0a202SJeff Mahoney SPACE_INFO_ATTR(total_bytes); 4806ab0a202SJeff Mahoney SPACE_INFO_ATTR(bytes_used); 4816ab0a202SJeff Mahoney SPACE_INFO_ATTR(bytes_pinned); 4826ab0a202SJeff Mahoney SPACE_INFO_ATTR(bytes_reserved); 4836ab0a202SJeff Mahoney SPACE_INFO_ATTR(bytes_may_use); 484c1fd5c30SWang Xiaoguang SPACE_INFO_ATTR(bytes_readonly); 4856ab0a202SJeff Mahoney SPACE_INFO_ATTR(disk_used); 4866ab0a202SJeff Mahoney SPACE_INFO_ATTR(disk_total); 487a969f4ccSHans van Kranenburg BTRFS_ATTR(space_info, total_bytes_pinned, 488a969f4ccSHans van Kranenburg btrfs_space_info_show_total_bytes_pinned); 4896ab0a202SJeff Mahoney 4906ab0a202SJeff Mahoney static struct attribute *space_info_attrs[] = { 491a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, flags), 492a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, total_bytes), 493a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, bytes_used), 494a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, bytes_pinned), 495a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, bytes_reserved), 496a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, bytes_may_use), 497a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, bytes_readonly), 498a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, disk_used), 499a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, disk_total), 500a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, total_bytes_pinned), 5016ab0a202SJeff Mahoney NULL, 5026ab0a202SJeff Mahoney }; 5037c7e3014SKimberly Brown ATTRIBUTE_GROUPS(space_info); 5046ab0a202SJeff Mahoney 5056ab0a202SJeff Mahoney static void space_info_release(struct kobject *kobj) 5066ab0a202SJeff Mahoney { 5076ab0a202SJeff Mahoney struct btrfs_space_info *sinfo = to_space_info(kobj); 5086ab0a202SJeff Mahoney percpu_counter_destroy(&sinfo->total_bytes_pinned); 5096ab0a202SJeff Mahoney kfree(sinfo); 5106ab0a202SJeff Mahoney } 5116ab0a202SJeff Mahoney 51227992d01SDavid Sterba static struct kobj_type space_info_ktype = { 5136ab0a202SJeff Mahoney .sysfs_ops = &kobj_sysfs_ops, 5146ab0a202SJeff Mahoney .release = space_info_release, 5157c7e3014SKimberly Brown .default_groups = space_info_groups, 5166ab0a202SJeff Mahoney }; 5176ab0a202SJeff Mahoney 5186ab0a202SJeff Mahoney static const struct attribute *allocation_attrs[] = { 519a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(allocation, global_rsv_reserved), 520a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(allocation, global_rsv_size), 5216ab0a202SJeff Mahoney NULL, 5226ab0a202SJeff Mahoney }; 5236ab0a202SJeff Mahoney 524f8ba9c11SJeff Mahoney static ssize_t btrfs_label_show(struct kobject *kobj, 525f8ba9c11SJeff Mahoney struct kobj_attribute *a, char *buf) 526f8ba9c11SJeff Mahoney { 527f8ba9c11SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj); 52848fcc3ffSSatoru Takeuchi char *label = fs_info->super_copy->label; 529ee17fc80SDavid Sterba ssize_t ret; 530ee17fc80SDavid Sterba 531ee17fc80SDavid Sterba spin_lock(&fs_info->super_lock); 532ee17fc80SDavid Sterba ret = snprintf(buf, PAGE_SIZE, label[0] ? "%s\n" : "%s", label); 533ee17fc80SDavid Sterba spin_unlock(&fs_info->super_lock); 534ee17fc80SDavid Sterba 535ee17fc80SDavid Sterba return ret; 536f8ba9c11SJeff Mahoney } 537f8ba9c11SJeff Mahoney 538f8ba9c11SJeff Mahoney static ssize_t btrfs_label_store(struct kobject *kobj, 539f8ba9c11SJeff Mahoney struct kobj_attribute *a, 540f8ba9c11SJeff Mahoney const char *buf, size_t len) 541f8ba9c11SJeff Mahoney { 542f8ba9c11SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj); 54348fcc3ffSSatoru Takeuchi size_t p_len; 544f8ba9c11SJeff Mahoney 54566ac9fe7SDavid Sterba if (!fs_info) 54666ac9fe7SDavid Sterba return -EPERM; 54766ac9fe7SDavid Sterba 548bc98a42cSDavid Howells if (sb_rdonly(fs_info->sb)) 54979aec2b8SAnand Jain return -EROFS; 55079aec2b8SAnand Jain 55148fcc3ffSSatoru Takeuchi /* 55248fcc3ffSSatoru Takeuchi * p_len is the len until the first occurrence of either 55348fcc3ffSSatoru Takeuchi * '\n' or '\0' 55448fcc3ffSSatoru Takeuchi */ 55548fcc3ffSSatoru Takeuchi p_len = strcspn(buf, "\n"); 55648fcc3ffSSatoru Takeuchi 55748fcc3ffSSatoru Takeuchi if (p_len >= BTRFS_LABEL_SIZE) 558f8ba9c11SJeff Mahoney return -EINVAL; 559f8ba9c11SJeff Mahoney 560a6f69dc8SDavid Sterba spin_lock(&fs_info->super_lock); 56148fcc3ffSSatoru Takeuchi memset(fs_info->super_copy->label, 0, BTRFS_LABEL_SIZE); 56248fcc3ffSSatoru Takeuchi memcpy(fs_info->super_copy->label, buf, p_len); 563a6f69dc8SDavid Sterba spin_unlock(&fs_info->super_lock); 564f8ba9c11SJeff Mahoney 565a6f69dc8SDavid Sterba /* 566a6f69dc8SDavid Sterba * We don't want to do full transaction commit from inside sysfs 567a6f69dc8SDavid Sterba */ 568a6f69dc8SDavid Sterba btrfs_set_pending(fs_info, COMMIT); 569a6f69dc8SDavid Sterba wake_up_process(fs_info->transaction_kthread); 570a6f69dc8SDavid Sterba 571f8ba9c11SJeff Mahoney return len; 572f8ba9c11SJeff Mahoney } 573a969f4ccSHans van Kranenburg BTRFS_ATTR_RW(, label, btrfs_label_show, btrfs_label_store); 574f8ba9c11SJeff Mahoney 575df93589aSDavid Sterba static ssize_t btrfs_nodesize_show(struct kobject *kobj, 576df93589aSDavid Sterba struct kobj_attribute *a, char *buf) 577df93589aSDavid Sterba { 578df93589aSDavid Sterba struct btrfs_fs_info *fs_info = to_fs_info(kobj); 579df93589aSDavid Sterba 580093e037cSDavid Sterba return snprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->nodesize); 581df93589aSDavid Sterba } 582df93589aSDavid Sterba 583a969f4ccSHans van Kranenburg BTRFS_ATTR(, nodesize, btrfs_nodesize_show); 584df93589aSDavid Sterba 585df93589aSDavid Sterba static ssize_t btrfs_sectorsize_show(struct kobject *kobj, 586df93589aSDavid Sterba struct kobj_attribute *a, char *buf) 587df93589aSDavid Sterba { 588df93589aSDavid Sterba struct btrfs_fs_info *fs_info = to_fs_info(kobj); 589df93589aSDavid Sterba 590093e037cSDavid Sterba return snprintf(buf, PAGE_SIZE, "%u\n", 591093e037cSDavid Sterba fs_info->super_copy->sectorsize); 592df93589aSDavid Sterba } 593df93589aSDavid Sterba 594a969f4ccSHans van Kranenburg BTRFS_ATTR(, sectorsize, btrfs_sectorsize_show); 595df93589aSDavid Sterba 596df93589aSDavid Sterba static ssize_t btrfs_clone_alignment_show(struct kobject *kobj, 597df93589aSDavid Sterba struct kobj_attribute *a, char *buf) 598df93589aSDavid Sterba { 599df93589aSDavid Sterba struct btrfs_fs_info *fs_info = to_fs_info(kobj); 600df93589aSDavid Sterba 601093e037cSDavid Sterba return snprintf(buf, PAGE_SIZE, "%u\n", 602093e037cSDavid Sterba fs_info->super_copy->sectorsize); 603df93589aSDavid Sterba } 604df93589aSDavid Sterba 605a969f4ccSHans van Kranenburg BTRFS_ATTR(, clone_alignment, btrfs_clone_alignment_show); 606df93589aSDavid Sterba 6072723480aSSargun Dhillon static ssize_t quota_override_show(struct kobject *kobj, 6082723480aSSargun Dhillon struct kobj_attribute *a, char *buf) 6092723480aSSargun Dhillon { 6102723480aSSargun Dhillon struct btrfs_fs_info *fs_info = to_fs_info(kobj); 6112723480aSSargun Dhillon int quota_override; 6122723480aSSargun Dhillon 6132723480aSSargun Dhillon quota_override = test_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags); 6142723480aSSargun Dhillon return snprintf(buf, PAGE_SIZE, "%d\n", quota_override); 6152723480aSSargun Dhillon } 6162723480aSSargun Dhillon 6172723480aSSargun Dhillon static ssize_t quota_override_store(struct kobject *kobj, 6182723480aSSargun Dhillon struct kobj_attribute *a, 6192723480aSSargun Dhillon const char *buf, size_t len) 6202723480aSSargun Dhillon { 6212723480aSSargun Dhillon struct btrfs_fs_info *fs_info = to_fs_info(kobj); 6222723480aSSargun Dhillon unsigned long knob; 6232723480aSSargun Dhillon int err; 6242723480aSSargun Dhillon 6252723480aSSargun Dhillon if (!fs_info) 6262723480aSSargun Dhillon return -EPERM; 6272723480aSSargun Dhillon 6282723480aSSargun Dhillon if (!capable(CAP_SYS_RESOURCE)) 6292723480aSSargun Dhillon return -EPERM; 6302723480aSSargun Dhillon 6312723480aSSargun Dhillon err = kstrtoul(buf, 10, &knob); 6322723480aSSargun Dhillon if (err) 6332723480aSSargun Dhillon return err; 6342723480aSSargun Dhillon if (knob > 1) 6352723480aSSargun Dhillon return -EINVAL; 6362723480aSSargun Dhillon 6372723480aSSargun Dhillon if (knob) 6382723480aSSargun Dhillon set_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags); 6392723480aSSargun Dhillon else 6402723480aSSargun Dhillon clear_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags); 6412723480aSSargun Dhillon 6422723480aSSargun Dhillon return len; 6432723480aSSargun Dhillon } 6442723480aSSargun Dhillon 645a969f4ccSHans van Kranenburg BTRFS_ATTR_RW(, quota_override, quota_override_show, quota_override_store); 6462723480aSSargun Dhillon 64756f20f40SNikolay Borisov static ssize_t btrfs_metadata_uuid_show(struct kobject *kobj, 64856f20f40SNikolay Borisov struct kobj_attribute *a, char *buf) 64956f20f40SNikolay Borisov { 65056f20f40SNikolay Borisov struct btrfs_fs_info *fs_info = to_fs_info(kobj); 65156f20f40SNikolay Borisov 65256f20f40SNikolay Borisov return snprintf(buf, PAGE_SIZE, "%pU\n", 65356f20f40SNikolay Borisov fs_info->fs_devices->metadata_uuid); 65456f20f40SNikolay Borisov } 65556f20f40SNikolay Borisov 65656f20f40SNikolay Borisov BTRFS_ATTR(, metadata_uuid, btrfs_metadata_uuid_show); 65756f20f40SNikolay Borisov 65841e6d2a8SJohannes Thumshirn static ssize_t btrfs_checksum_show(struct kobject *kobj, 65941e6d2a8SJohannes Thumshirn struct kobj_attribute *a, char *buf) 66041e6d2a8SJohannes Thumshirn { 66141e6d2a8SJohannes Thumshirn struct btrfs_fs_info *fs_info = to_fs_info(kobj); 66241e6d2a8SJohannes Thumshirn u16 csum_type = btrfs_super_csum_type(fs_info->super_copy); 66341e6d2a8SJohannes Thumshirn 66441e6d2a8SJohannes Thumshirn return snprintf(buf, PAGE_SIZE, "%s (%s)\n", 66541e6d2a8SJohannes Thumshirn btrfs_super_csum_name(csum_type), 66641e6d2a8SJohannes Thumshirn crypto_shash_driver_name(fs_info->csum_shash)); 66741e6d2a8SJohannes Thumshirn } 66841e6d2a8SJohannes Thumshirn 66941e6d2a8SJohannes Thumshirn BTRFS_ATTR(, checksum, btrfs_checksum_show); 67041e6d2a8SJohannes Thumshirn 6710dd2906fSAnand Jain static const struct attribute *btrfs_attrs[] = { 672a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(, label), 673a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(, nodesize), 674a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(, sectorsize), 675a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(, clone_alignment), 676a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(, quota_override), 67756f20f40SNikolay Borisov BTRFS_ATTR_PTR(, metadata_uuid), 67841e6d2a8SJohannes Thumshirn BTRFS_ATTR_PTR(, checksum), 679f8ba9c11SJeff Mahoney NULL, 680f8ba9c11SJeff Mahoney }; 681f8ba9c11SJeff Mahoney 682c1b7e474SAnand Jain static void btrfs_release_fsid_kobj(struct kobject *kobj) 683510d7360SJeff Mahoney { 6842e7910d6SAnand Jain struct btrfs_fs_devices *fs_devs = to_fs_devs(kobj); 685248d200dSAnand Jain 686c1b7e474SAnand Jain memset(&fs_devs->fsid_kobj, 0, sizeof(struct kobject)); 6872e7910d6SAnand Jain complete(&fs_devs->kobj_unregister); 688510d7360SJeff Mahoney } 689510d7360SJeff Mahoney 690510d7360SJeff Mahoney static struct kobj_type btrfs_ktype = { 691510d7360SJeff Mahoney .sysfs_ops = &kobj_sysfs_ops, 692c1b7e474SAnand Jain .release = btrfs_release_fsid_kobj, 693510d7360SJeff Mahoney }; 694510d7360SJeff Mahoney 6952e7910d6SAnand Jain static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj) 6962e7910d6SAnand Jain { 6972e7910d6SAnand Jain if (kobj->ktype != &btrfs_ktype) 6982e7910d6SAnand Jain return NULL; 699c1b7e474SAnand Jain return container_of(kobj, struct btrfs_fs_devices, fsid_kobj); 7002e7910d6SAnand Jain } 7012e7910d6SAnand Jain 702510d7360SJeff Mahoney static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj) 703510d7360SJeff Mahoney { 704510d7360SJeff Mahoney if (kobj->ktype != &btrfs_ktype) 705510d7360SJeff Mahoney return NULL; 7062e7910d6SAnand Jain return to_fs_devs(kobj)->fs_info; 707510d7360SJeff Mahoney } 70858176a96SJosef Bacik 709e453d989SJeff Mahoney #define NUM_FEATURE_BITS 64 7106c52157fSTomohiro Misono #define BTRFS_FEATURE_NAME_MAX 13 7116c52157fSTomohiro Misono static char btrfs_unknown_feature_names[FEAT_MAX][NUM_FEATURE_BITS][BTRFS_FEATURE_NAME_MAX]; 7126c52157fSTomohiro Misono static struct btrfs_feature_attr btrfs_feature_attrs[FEAT_MAX][NUM_FEATURE_BITS]; 713e453d989SJeff Mahoney 7146c52157fSTomohiro Misono static const u64 supported_feature_masks[FEAT_MAX] = { 715e453d989SJeff Mahoney [FEAT_COMPAT] = BTRFS_FEATURE_COMPAT_SUPP, 716e453d989SJeff Mahoney [FEAT_COMPAT_RO] = BTRFS_FEATURE_COMPAT_RO_SUPP, 717e453d989SJeff Mahoney [FEAT_INCOMPAT] = BTRFS_FEATURE_INCOMPAT_SUPP, 718e453d989SJeff Mahoney }; 719e453d989SJeff Mahoney 720e453d989SJeff Mahoney static int addrm_unknown_feature_attrs(struct btrfs_fs_info *fs_info, bool add) 7215ac1d209SJeff Mahoney { 722e453d989SJeff Mahoney int set; 723e453d989SJeff Mahoney 724e453d989SJeff Mahoney for (set = 0; set < FEAT_MAX; set++) { 725e453d989SJeff Mahoney int i; 726e453d989SJeff Mahoney struct attribute *attrs[2]; 727e453d989SJeff Mahoney struct attribute_group agroup = { 728e453d989SJeff Mahoney .name = "features", 729e453d989SJeff Mahoney .attrs = attrs, 730e453d989SJeff Mahoney }; 731e453d989SJeff Mahoney u64 features = get_features(fs_info, set); 732e453d989SJeff Mahoney features &= ~supported_feature_masks[set]; 733e453d989SJeff Mahoney 734e453d989SJeff Mahoney if (!features) 735e453d989SJeff Mahoney continue; 736e453d989SJeff Mahoney 737e453d989SJeff Mahoney attrs[1] = NULL; 738e453d989SJeff Mahoney for (i = 0; i < NUM_FEATURE_BITS; i++) { 739e453d989SJeff Mahoney struct btrfs_feature_attr *fa; 740e453d989SJeff Mahoney 741e453d989SJeff Mahoney if (!(features & (1ULL << i))) 742e453d989SJeff Mahoney continue; 743e453d989SJeff Mahoney 744e453d989SJeff Mahoney fa = &btrfs_feature_attrs[set][i]; 745e453d989SJeff Mahoney attrs[0] = &fa->kobj_attr.attr; 746e453d989SJeff Mahoney if (add) { 747e453d989SJeff Mahoney int ret; 748c1b7e474SAnand Jain ret = sysfs_merge_group(&fs_info->fs_devices->fsid_kobj, 749e453d989SJeff Mahoney &agroup); 750e453d989SJeff Mahoney if (ret) 751e453d989SJeff Mahoney return ret; 752e453d989SJeff Mahoney } else 753c1b7e474SAnand Jain sysfs_unmerge_group(&fs_info->fs_devices->fsid_kobj, 754e453d989SJeff Mahoney &agroup); 755e453d989SJeff Mahoney } 756e453d989SJeff Mahoney 757e453d989SJeff Mahoney } 758e453d989SJeff Mahoney return 0; 759e453d989SJeff Mahoney } 760e453d989SJeff Mahoney 7612e3e1281SAnand Jain static void __btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs) 762e453d989SJeff Mahoney { 763b5501504SAnand Jain if (fs_devs->devices_kobj) { 764b5501504SAnand Jain kobject_del(fs_devs->devices_kobj); 765b5501504SAnand Jain kobject_put(fs_devs->devices_kobj); 766b5501504SAnand Jain fs_devs->devices_kobj = NULL; 767aaf13305SAnand Jain } 768aaf13305SAnand Jain 769c1b7e474SAnand Jain if (fs_devs->fsid_kobj.state_initialized) { 770c1b7e474SAnand Jain kobject_del(&fs_devs->fsid_kobj); 771c1b7e474SAnand Jain kobject_put(&fs_devs->fsid_kobj); 7722e7910d6SAnand Jain wait_for_completion(&fs_devs->kobj_unregister); 7735ac1d209SJeff Mahoney } 774f90fc547SAnand Jain } 7755ac1d209SJeff Mahoney 7762e3e1281SAnand Jain /* when fs_devs is NULL it will remove all fsid kobject */ 7771d1c1be3SAnand Jain void btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs) 7782e3e1281SAnand Jain { 7792e3e1281SAnand Jain struct list_head *fs_uuids = btrfs_get_fs_uuids(); 7802e3e1281SAnand Jain 7812e3e1281SAnand Jain if (fs_devs) { 7822e3e1281SAnand Jain __btrfs_sysfs_remove_fsid(fs_devs); 7832e3e1281SAnand Jain return; 7842e3e1281SAnand Jain } 7852e3e1281SAnand Jain 786c4babc5eSAnand Jain list_for_each_entry(fs_devs, fs_uuids, fs_list) { 7872e3e1281SAnand Jain __btrfs_sysfs_remove_fsid(fs_devs); 7882e3e1281SAnand Jain } 7892e3e1281SAnand Jain } 7902e3e1281SAnand Jain 7916618a59bSAnand Jain void btrfs_sysfs_remove_mounted(struct btrfs_fs_info *fs_info) 792e453d989SJeff Mahoney { 7935a13f430SAnand Jain btrfs_reset_fs_info_ptr(fs_info); 7945a13f430SAnand Jain 795e453d989SJeff Mahoney if (fs_info->space_info_kobj) { 796e453d989SJeff Mahoney sysfs_remove_files(fs_info->space_info_kobj, allocation_attrs); 797e453d989SJeff Mahoney kobject_del(fs_info->space_info_kobj); 798e453d989SJeff Mahoney kobject_put(fs_info->space_info_kobj); 799e453d989SJeff Mahoney } 80071e8978eSDennis Zhou #ifdef CONFIG_BTRFS_DEBUG 801e4faab84SDennis Zhou if (fs_info->discard_debug_kobj) { 802e4faab84SDennis Zhou sysfs_remove_files(fs_info->discard_debug_kobj, 803e4faab84SDennis Zhou discard_debug_attrs); 804e4faab84SDennis Zhou kobject_del(fs_info->discard_debug_kobj); 805e4faab84SDennis Zhou kobject_put(fs_info->discard_debug_kobj); 806e4faab84SDennis Zhou } 80793945cb4SDennis Zhou if (fs_info->debug_kobj) { 80893945cb4SDennis Zhou sysfs_remove_files(fs_info->debug_kobj, btrfs_debug_mount_attrs); 80993945cb4SDennis Zhou kobject_del(fs_info->debug_kobj); 81093945cb4SDennis Zhou kobject_put(fs_info->debug_kobj); 81193945cb4SDennis Zhou } 81271e8978eSDennis Zhou #endif 813e453d989SJeff Mahoney addrm_unknown_feature_attrs(fs_info, false); 814c1b7e474SAnand Jain sysfs_remove_group(&fs_info->fs_devices->fsid_kobj, &btrfs_feature_attr_group); 815c1b7e474SAnand Jain sysfs_remove_files(&fs_info->fs_devices->fsid_kobj, btrfs_attrs); 81632576040SAnand Jain btrfs_sysfs_rm_device_link(fs_info->fs_devices, NULL); 817e453d989SJeff Mahoney } 818e453d989SJeff Mahoney 819f10152bcSDavid Sterba static const char * const btrfs_feature_set_names[FEAT_MAX] = { 82079da4fa4SJeff Mahoney [FEAT_COMPAT] = "compat", 82179da4fa4SJeff Mahoney [FEAT_COMPAT_RO] = "compat_ro", 82279da4fa4SJeff Mahoney [FEAT_INCOMPAT] = "incompat", 82379da4fa4SJeff Mahoney }; 82479da4fa4SJeff Mahoney 825f10152bcSDavid Sterba const char * const btrfs_feature_set_name(enum btrfs_feature_set set) 826f10152bcSDavid Sterba { 827f10152bcSDavid Sterba return btrfs_feature_set_names[set]; 828f10152bcSDavid Sterba } 829f10152bcSDavid Sterba 8303b02a68aSJeff Mahoney char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags) 8313b02a68aSJeff Mahoney { 8323b02a68aSJeff Mahoney size_t bufsize = 4096; /* safe max, 64 names * 64 bytes */ 8333b02a68aSJeff Mahoney int len = 0; 8343b02a68aSJeff Mahoney int i; 8353b02a68aSJeff Mahoney char *str; 8363b02a68aSJeff Mahoney 8373b02a68aSJeff Mahoney str = kmalloc(bufsize, GFP_KERNEL); 8383b02a68aSJeff Mahoney if (!str) 8393b02a68aSJeff Mahoney return str; 8403b02a68aSJeff Mahoney 8413b02a68aSJeff Mahoney for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { 8423b02a68aSJeff Mahoney const char *name; 8433b02a68aSJeff Mahoney 8443b02a68aSJeff Mahoney if (!(flags & (1ULL << i))) 8453b02a68aSJeff Mahoney continue; 8463b02a68aSJeff Mahoney 8473b02a68aSJeff Mahoney name = btrfs_feature_attrs[set][i].kobj_attr.attr.name; 8483b02a68aSJeff Mahoney len += snprintf(str + len, bufsize - len, "%s%s", 8493b02a68aSJeff Mahoney len ? "," : "", name); 8503b02a68aSJeff Mahoney } 8513b02a68aSJeff Mahoney 8523b02a68aSJeff Mahoney return str; 8533b02a68aSJeff Mahoney } 8543b02a68aSJeff Mahoney 85579da4fa4SJeff Mahoney static void init_feature_attrs(void) 85679da4fa4SJeff Mahoney { 85779da4fa4SJeff Mahoney struct btrfs_feature_attr *fa; 85879da4fa4SJeff Mahoney int set, i; 85979da4fa4SJeff Mahoney 86079da4fa4SJeff Mahoney BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names) != 86179da4fa4SJeff Mahoney ARRAY_SIZE(btrfs_feature_attrs)); 86279da4fa4SJeff Mahoney BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names[0]) != 86379da4fa4SJeff Mahoney ARRAY_SIZE(btrfs_feature_attrs[0])); 86479da4fa4SJeff Mahoney 8653b02a68aSJeff Mahoney memset(btrfs_feature_attrs, 0, sizeof(btrfs_feature_attrs)); 8663b02a68aSJeff Mahoney memset(btrfs_unknown_feature_names, 0, 8673b02a68aSJeff Mahoney sizeof(btrfs_unknown_feature_names)); 8683b02a68aSJeff Mahoney 86979da4fa4SJeff Mahoney for (i = 0; btrfs_supported_feature_attrs[i]; i++) { 87079da4fa4SJeff Mahoney struct btrfs_feature_attr *sfa; 87179da4fa4SJeff Mahoney struct attribute *a = btrfs_supported_feature_attrs[i]; 8723b02a68aSJeff Mahoney int bit; 87379da4fa4SJeff Mahoney sfa = attr_to_btrfs_feature_attr(a); 8743b02a68aSJeff Mahoney bit = ilog2(sfa->feature_bit); 8753b02a68aSJeff Mahoney fa = &btrfs_feature_attrs[sfa->feature_set][bit]; 87679da4fa4SJeff Mahoney 87779da4fa4SJeff Mahoney fa->kobj_attr.attr.name = sfa->kobj_attr.attr.name; 87879da4fa4SJeff Mahoney } 87979da4fa4SJeff Mahoney 88079da4fa4SJeff Mahoney for (set = 0; set < FEAT_MAX; set++) { 88179da4fa4SJeff Mahoney for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { 88279da4fa4SJeff Mahoney char *name = btrfs_unknown_feature_names[set][i]; 88379da4fa4SJeff Mahoney fa = &btrfs_feature_attrs[set][i]; 88479da4fa4SJeff Mahoney 88579da4fa4SJeff Mahoney if (fa->kobj_attr.attr.name) 88679da4fa4SJeff Mahoney continue; 88779da4fa4SJeff Mahoney 8886c52157fSTomohiro Misono snprintf(name, BTRFS_FEATURE_NAME_MAX, "%s:%u", 88979da4fa4SJeff Mahoney btrfs_feature_set_names[set], i); 89079da4fa4SJeff Mahoney 89179da4fa4SJeff Mahoney fa->kobj_attr.attr.name = name; 89279da4fa4SJeff Mahoney fa->kobj_attr.attr.mode = S_IRUGO; 89379da4fa4SJeff Mahoney fa->feature_set = set; 89479da4fa4SJeff Mahoney fa->feature_bit = 1ULL << i; 89579da4fa4SJeff Mahoney } 89679da4fa4SJeff Mahoney } 89779da4fa4SJeff Mahoney } 89879da4fa4SJeff Mahoney 89932a9991fSDavid Sterba /* 90032a9991fSDavid Sterba * Create a sysfs entry for a given block group type at path 90132a9991fSDavid Sterba * /sys/fs/btrfs/UUID/allocation/data/TYPE 90232a9991fSDavid Sterba */ 90332da5386SDavid Sterba void btrfs_sysfs_add_block_group_type(struct btrfs_block_group *cache) 90432a9991fSDavid Sterba { 90532a9991fSDavid Sterba struct btrfs_fs_info *fs_info = cache->fs_info; 90632a9991fSDavid Sterba struct btrfs_space_info *space_info = cache->space_info; 90732a9991fSDavid Sterba struct raid_kobject *rkobj; 90832a9991fSDavid Sterba const int index = btrfs_bg_flags_to_raid_index(cache->flags); 90932a9991fSDavid Sterba unsigned int nofs_flag; 91032a9991fSDavid Sterba int ret; 91132a9991fSDavid Sterba 91232a9991fSDavid Sterba /* 91332a9991fSDavid Sterba * Setup a NOFS context because kobject_add(), deep in its call chain, 91432a9991fSDavid Sterba * does GFP_KERNEL allocations, and we are often called in a context 91532a9991fSDavid Sterba * where if reclaim is triggered we can deadlock (we are either holding 91632a9991fSDavid Sterba * a transaction handle or some lock required for a transaction 91732a9991fSDavid Sterba * commit). 91832a9991fSDavid Sterba */ 91932a9991fSDavid Sterba nofs_flag = memalloc_nofs_save(); 92032a9991fSDavid Sterba 92132a9991fSDavid Sterba rkobj = kzalloc(sizeof(*rkobj), GFP_NOFS); 92232a9991fSDavid Sterba if (!rkobj) { 92332a9991fSDavid Sterba memalloc_nofs_restore(nofs_flag); 92432a9991fSDavid Sterba btrfs_warn(cache->fs_info, 92532a9991fSDavid Sterba "couldn't alloc memory for raid level kobject"); 92632a9991fSDavid Sterba return; 92732a9991fSDavid Sterba } 92832a9991fSDavid Sterba 92932a9991fSDavid Sterba rkobj->flags = cache->flags; 93032a9991fSDavid Sterba kobject_init(&rkobj->kobj, &btrfs_raid_ktype); 93132a9991fSDavid Sterba ret = kobject_add(&rkobj->kobj, &space_info->kobj, "%s", 93232a9991fSDavid Sterba btrfs_bg_type_to_raid_name(rkobj->flags)); 93332a9991fSDavid Sterba memalloc_nofs_restore(nofs_flag); 93432a9991fSDavid Sterba if (ret) { 93532a9991fSDavid Sterba kobject_put(&rkobj->kobj); 93632a9991fSDavid Sterba btrfs_warn(fs_info, 93732a9991fSDavid Sterba "failed to add kobject for block cache, ignoring"); 93832a9991fSDavid Sterba return; 93932a9991fSDavid Sterba } 94032a9991fSDavid Sterba 94132a9991fSDavid Sterba space_info->block_group_kobjs[index] = &rkobj->kobj; 94232a9991fSDavid Sterba } 94332a9991fSDavid Sterba 944b5865babSDavid Sterba /* 945b5865babSDavid Sterba * Remove sysfs directories for all block group types of a given space info and 946b5865babSDavid Sterba * the space info as well 947b5865babSDavid Sterba */ 948b5865babSDavid Sterba void btrfs_sysfs_remove_space_info(struct btrfs_space_info *space_info) 949b5865babSDavid Sterba { 950b5865babSDavid Sterba int i; 951b5865babSDavid Sterba 952b5865babSDavid Sterba for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) { 953b5865babSDavid Sterba struct kobject *kobj; 954b5865babSDavid Sterba 955b5865babSDavid Sterba kobj = space_info->block_group_kobjs[i]; 956b5865babSDavid Sterba space_info->block_group_kobjs[i] = NULL; 957b5865babSDavid Sterba if (kobj) { 958b5865babSDavid Sterba kobject_del(kobj); 959b5865babSDavid Sterba kobject_put(kobj); 960b5865babSDavid Sterba } 961b5865babSDavid Sterba } 962b5865babSDavid Sterba kobject_del(&space_info->kobj); 963b5865babSDavid Sterba kobject_put(&space_info->kobj); 964b5865babSDavid Sterba } 965b5865babSDavid Sterba 966b882327aSDavid Sterba static const char *alloc_name(u64 flags) 967b882327aSDavid Sterba { 968b882327aSDavid Sterba switch (flags) { 969b882327aSDavid Sterba case BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_DATA: 970b882327aSDavid Sterba return "mixed"; 971b882327aSDavid Sterba case BTRFS_BLOCK_GROUP_METADATA: 972b882327aSDavid Sterba return "metadata"; 973b882327aSDavid Sterba case BTRFS_BLOCK_GROUP_DATA: 974b882327aSDavid Sterba return "data"; 975b882327aSDavid Sterba case BTRFS_BLOCK_GROUP_SYSTEM: 976b882327aSDavid Sterba return "system"; 977b882327aSDavid Sterba default: 978b882327aSDavid Sterba WARN_ON(1); 979b882327aSDavid Sterba return "invalid-combination"; 980b882327aSDavid Sterba }; 981b882327aSDavid Sterba } 982b882327aSDavid Sterba 983b882327aSDavid Sterba /* 984b882327aSDavid Sterba * Create a sysfs entry for a space info type at path 985b882327aSDavid Sterba * /sys/fs/btrfs/UUID/allocation/TYPE 986b882327aSDavid Sterba */ 987b882327aSDavid Sterba int btrfs_sysfs_add_space_info_type(struct btrfs_fs_info *fs_info, 988b882327aSDavid Sterba struct btrfs_space_info *space_info) 989b882327aSDavid Sterba { 990b882327aSDavid Sterba int ret; 991b882327aSDavid Sterba 992b882327aSDavid Sterba ret = kobject_init_and_add(&space_info->kobj, &space_info_ktype, 993b882327aSDavid Sterba fs_info->space_info_kobj, "%s", 994b882327aSDavid Sterba alloc_name(space_info->flags)); 995b882327aSDavid Sterba if (ret) { 996b882327aSDavid Sterba kobject_put(&space_info->kobj); 997b882327aSDavid Sterba return ret; 998b882327aSDavid Sterba } 999b882327aSDavid Sterba 1000b882327aSDavid Sterba return 0; 1001b882327aSDavid Sterba } 1002b882327aSDavid Sterba 1003e7e1aa9cSAnand Jain /* when one_device is NULL, it removes all device links */ 1004e7e1aa9cSAnand Jain 100532576040SAnand Jain int btrfs_sysfs_rm_device_link(struct btrfs_fs_devices *fs_devices, 100699994cdeSAnand Jain struct btrfs_device *one_device) 100799994cdeSAnand Jain { 100899994cdeSAnand Jain struct hd_struct *disk; 100999994cdeSAnand Jain struct kobject *disk_kobj; 101099994cdeSAnand Jain 1011b5501504SAnand Jain if (!fs_devices->devices_kobj) 101299994cdeSAnand Jain return -EINVAL; 101399994cdeSAnand Jain 101487fa3bb0SLiu Bo if (one_device && one_device->bdev) { 101599994cdeSAnand Jain disk = one_device->bdev->bd_part; 101699994cdeSAnand Jain disk_kobj = &part_to_dev(disk)->kobj; 101799994cdeSAnand Jain 1018b5501504SAnand Jain sysfs_remove_link(fs_devices->devices_kobj, disk_kobj->name); 101999994cdeSAnand Jain } 102099994cdeSAnand Jain 1021e7e1aa9cSAnand Jain if (one_device) 1022e7e1aa9cSAnand Jain return 0; 1023e7e1aa9cSAnand Jain 1024e7e1aa9cSAnand Jain list_for_each_entry(one_device, 10256c14a164SAnand Jain &fs_devices->devices, dev_list) { 1026e7e1aa9cSAnand Jain if (!one_device->bdev) 1027e7e1aa9cSAnand Jain continue; 1028e7e1aa9cSAnand Jain disk = one_device->bdev->bd_part; 1029e7e1aa9cSAnand Jain disk_kobj = &part_to_dev(disk)->kobj; 1030e7e1aa9cSAnand Jain 1031b5501504SAnand Jain sysfs_remove_link(fs_devices->devices_kobj, disk_kobj->name); 1032e7e1aa9cSAnand Jain } 1033e7e1aa9cSAnand Jain 103499994cdeSAnand Jain return 0; 103599994cdeSAnand Jain } 103699994cdeSAnand Jain 1037e3bd6973SAnand Jain int btrfs_sysfs_add_device_link(struct btrfs_fs_devices *fs_devices, 10380d39376aSAnand Jain struct btrfs_device *one_device) 103929e5be24SJeff Mahoney { 104029e5be24SJeff Mahoney int error = 0; 104129e5be24SJeff Mahoney struct btrfs_device *dev; 104229e5be24SJeff Mahoney 104329e5be24SJeff Mahoney list_for_each_entry(dev, &fs_devices->devices, dev_list) { 1044f085381eSAnand Jain struct hd_struct *disk; 1045f085381eSAnand Jain struct kobject *disk_kobj; 1046f085381eSAnand Jain 1047f085381eSAnand Jain if (!dev->bdev) 1048f085381eSAnand Jain continue; 1049f085381eSAnand Jain 10500d39376aSAnand Jain if (one_device && one_device != dev) 10510d39376aSAnand Jain continue; 10520d39376aSAnand Jain 1053f085381eSAnand Jain disk = dev->bdev->bd_part; 1054f085381eSAnand Jain disk_kobj = &part_to_dev(disk)->kobj; 105529e5be24SJeff Mahoney 1056b5501504SAnand Jain error = sysfs_create_link(fs_devices->devices_kobj, 105729e5be24SJeff Mahoney disk_kobj, disk_kobj->name); 105829e5be24SJeff Mahoney if (error) 105929e5be24SJeff Mahoney break; 106029e5be24SJeff Mahoney } 106129e5be24SJeff Mahoney 106229e5be24SJeff Mahoney return error; 106329e5be24SJeff Mahoney } 106429e5be24SJeff Mahoney 10655b28692eSDavid Sterba void btrfs_kobject_uevent(struct block_device *bdev, enum kobject_action action) 10665b28692eSDavid Sterba { 10675b28692eSDavid Sterba int ret; 10685b28692eSDavid Sterba 10695b28692eSDavid Sterba ret = kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, action); 10705b28692eSDavid Sterba if (ret) 10715b28692eSDavid Sterba pr_warn("BTRFS: Sending event '%d' to kobject: '%s' (%p): failed\n", 10725b28692eSDavid Sterba action, kobject_name(&disk_to_dev(bdev->bd_disk)->kobj), 10735b28692eSDavid Sterba &disk_to_dev(bdev->bd_disk)->kobj); 10745b28692eSDavid Sterba } 10755b28692eSDavid Sterba 1076f93c3997SDavid Sterba void btrfs_sysfs_update_sprout_fsid(struct btrfs_fs_devices *fs_devices, 1077f93c3997SDavid Sterba const u8 *fsid) 1078f93c3997SDavid Sterba { 1079f93c3997SDavid Sterba char fsid_buf[BTRFS_UUID_UNPARSED_SIZE]; 1080f93c3997SDavid Sterba 1081f93c3997SDavid Sterba /* 1082f93c3997SDavid Sterba * Sprouting changes fsid of the mounted filesystem, rename the fsid 1083f93c3997SDavid Sterba * directory 1084f93c3997SDavid Sterba */ 1085f93c3997SDavid Sterba snprintf(fsid_buf, BTRFS_UUID_UNPARSED_SIZE, "%pU", fsid); 1086f93c3997SDavid Sterba if (kobject_rename(&fs_devices->fsid_kobj, fsid_buf)) 1087f93c3997SDavid Sterba btrfs_warn(fs_devices->fs_info, 1088f93c3997SDavid Sterba "sysfs: failed to create fsid for sprout"); 1089f93c3997SDavid Sterba } 1090f93c3997SDavid Sterba 1091510d7360SJeff Mahoney /* /sys/fs/btrfs/ entry */ 1092510d7360SJeff Mahoney static struct kset *btrfs_kset; 1093510d7360SJeff Mahoney 109472059215SAnand Jain /* 1095c6761a9eSAnand Jain * Creates: 1096c6761a9eSAnand Jain * /sys/fs/btrfs/UUID 1097c6761a9eSAnand Jain * 109872059215SAnand Jain * Can be called by the device discovery thread. 109972059215SAnand Jain */ 1100c6761a9eSAnand Jain int btrfs_sysfs_add_fsid(struct btrfs_fs_devices *fs_devs) 11015ac1d209SJeff Mahoney { 11025ac1d209SJeff Mahoney int error; 11035ac1d209SJeff Mahoney 11042e7910d6SAnand Jain init_completion(&fs_devs->kobj_unregister); 1105c1b7e474SAnand Jain fs_devs->fsid_kobj.kset = btrfs_kset; 1106c6761a9eSAnand Jain error = kobject_init_and_add(&fs_devs->fsid_kobj, &btrfs_ktype, NULL, 1107c6761a9eSAnand Jain "%pU", fs_devs->fsid); 1108e3277335STobin C. Harding if (error) { 1109e3277335STobin C. Harding kobject_put(&fs_devs->fsid_kobj); 111072059215SAnand Jain return error; 111172059215SAnand Jain } 111272059215SAnand Jain 1113bc036bb3SAnand Jain fs_devs->devices_kobj = kobject_create_and_add("devices", 1114bc036bb3SAnand Jain &fs_devs->fsid_kobj); 1115bc036bb3SAnand Jain if (!fs_devs->devices_kobj) { 1116bc036bb3SAnand Jain btrfs_err(fs_devs->fs_info, 1117bc036bb3SAnand Jain "failed to init sysfs device interface"); 1118bc036bb3SAnand Jain kobject_put(&fs_devs->fsid_kobj); 1119bc036bb3SAnand Jain return -ENOMEM; 1120bc036bb3SAnand Jain } 1121bc036bb3SAnand Jain 1122e3277335STobin C. Harding return 0; 1123e3277335STobin C. Harding } 1124e3277335STobin C. Harding 112596f3136eSAnand Jain int btrfs_sysfs_add_mounted(struct btrfs_fs_info *fs_info) 112672059215SAnand Jain { 112772059215SAnand Jain int error; 11282e7910d6SAnand Jain struct btrfs_fs_devices *fs_devs = fs_info->fs_devices; 1129c1b7e474SAnand Jain struct kobject *fsid_kobj = &fs_devs->fsid_kobj; 113072059215SAnand Jain 11315a13f430SAnand Jain btrfs_set_fs_info_ptr(fs_info); 11325a13f430SAnand Jain 1133e3bd6973SAnand Jain error = btrfs_sysfs_add_device_link(fs_devs, NULL); 1134e453d989SJeff Mahoney if (error) 1135e453d989SJeff Mahoney return error; 1136510d7360SJeff Mahoney 1137c1b7e474SAnand Jain error = sysfs_create_files(fsid_kobj, btrfs_attrs); 1138e453d989SJeff Mahoney if (error) { 113932576040SAnand Jain btrfs_sysfs_rm_device_link(fs_devs, NULL); 1140e453d989SJeff Mahoney return error; 1141e453d989SJeff Mahoney } 114279da4fa4SJeff Mahoney 1143c1b7e474SAnand Jain error = sysfs_create_group(fsid_kobj, 11440dd2906fSAnand Jain &btrfs_feature_attr_group); 11450dd2906fSAnand Jain if (error) 11460dd2906fSAnand Jain goto failure; 11470dd2906fSAnand Jain 11486e369febSDavid Sterba #ifdef CONFIG_BTRFS_DEBUG 114993945cb4SDennis Zhou fs_info->debug_kobj = kobject_create_and_add("debug", fsid_kobj); 115093945cb4SDennis Zhou if (!fs_info->debug_kobj) { 115193945cb4SDennis Zhou error = -ENOMEM; 115293945cb4SDennis Zhou goto failure; 115393945cb4SDennis Zhou } 115493945cb4SDennis Zhou 115593945cb4SDennis Zhou error = sysfs_create_files(fs_info->debug_kobj, btrfs_debug_mount_attrs); 11566e369febSDavid Sterba if (error) 11576e369febSDavid Sterba goto failure; 1158e4faab84SDennis Zhou 1159e4faab84SDennis Zhou /* Discard directory */ 1160e4faab84SDennis Zhou fs_info->discard_debug_kobj = kobject_create_and_add("discard", 1161e4faab84SDennis Zhou fs_info->debug_kobj); 1162e4faab84SDennis Zhou if (!fs_info->discard_debug_kobj) { 1163e4faab84SDennis Zhou error = -ENOMEM; 1164e4faab84SDennis Zhou goto failure; 1165e4faab84SDennis Zhou } 1166e4faab84SDennis Zhou 1167e4faab84SDennis Zhou error = sysfs_create_files(fs_info->discard_debug_kobj, 1168e4faab84SDennis Zhou discard_debug_attrs); 1169e4faab84SDennis Zhou if (error) 1170e4faab84SDennis Zhou goto failure; 11716e369febSDavid Sterba #endif 11726e369febSDavid Sterba 1173e453d989SJeff Mahoney error = addrm_unknown_feature_attrs(fs_info, true); 117479da4fa4SJeff Mahoney if (error) 117579da4fa4SJeff Mahoney goto failure; 117679da4fa4SJeff Mahoney 11776ab0a202SJeff Mahoney fs_info->space_info_kobj = kobject_create_and_add("allocation", 1178c1b7e474SAnand Jain fsid_kobj); 11796ab0a202SJeff Mahoney if (!fs_info->space_info_kobj) { 11806ab0a202SJeff Mahoney error = -ENOMEM; 11816ab0a202SJeff Mahoney goto failure; 11826ab0a202SJeff Mahoney } 11836ab0a202SJeff Mahoney 11846ab0a202SJeff Mahoney error = sysfs_create_files(fs_info->space_info_kobj, allocation_attrs); 11856ab0a202SJeff Mahoney if (error) 11866ab0a202SJeff Mahoney goto failure; 11876ab0a202SJeff Mahoney 118879da4fa4SJeff Mahoney return 0; 118979da4fa4SJeff Mahoney failure: 11906618a59bSAnand Jain btrfs_sysfs_remove_mounted(fs_info); 11915ac1d209SJeff Mahoney return error; 11925ac1d209SJeff Mahoney } 11935ac1d209SJeff Mahoney 1194444e7516SDavid Sterba 1195444e7516SDavid Sterba /* 1196444e7516SDavid Sterba * Change per-fs features in /sys/fs/btrfs/UUID/features to match current 1197444e7516SDavid Sterba * values in superblock. Call after any changes to incompat/compat_ro flags 1198444e7516SDavid Sterba */ 1199444e7516SDavid Sterba void btrfs_sysfs_feature_update(struct btrfs_fs_info *fs_info, 1200444e7516SDavid Sterba u64 bit, enum btrfs_feature_set set) 1201444e7516SDavid Sterba { 1202444e7516SDavid Sterba struct btrfs_fs_devices *fs_devs; 1203444e7516SDavid Sterba struct kobject *fsid_kobj; 1204444e7516SDavid Sterba u64 features; 1205444e7516SDavid Sterba int ret; 1206444e7516SDavid Sterba 1207444e7516SDavid Sterba if (!fs_info) 1208444e7516SDavid Sterba return; 1209444e7516SDavid Sterba 1210444e7516SDavid Sterba features = get_features(fs_info, set); 1211444e7516SDavid Sterba ASSERT(bit & supported_feature_masks[set]); 1212444e7516SDavid Sterba 1213444e7516SDavid Sterba fs_devs = fs_info->fs_devices; 1214444e7516SDavid Sterba fsid_kobj = &fs_devs->fsid_kobj; 1215444e7516SDavid Sterba 1216bf609206SDavid Sterba if (!fsid_kobj->state_initialized) 1217bf609206SDavid Sterba return; 1218bf609206SDavid Sterba 1219444e7516SDavid Sterba /* 1220444e7516SDavid Sterba * FIXME: this is too heavy to update just one value, ideally we'd like 1221444e7516SDavid Sterba * to use sysfs_update_group but some refactoring is needed first. 1222444e7516SDavid Sterba */ 1223444e7516SDavid Sterba sysfs_remove_group(fsid_kobj, &btrfs_feature_attr_group); 1224444e7516SDavid Sterba ret = sysfs_create_group(fsid_kobj, &btrfs_feature_attr_group); 1225444e7516SDavid Sterba } 1226444e7516SDavid Sterba 1227f5c29bd9SLiu Bo int __init btrfs_init_sysfs(void) 122858176a96SJosef Bacik { 1229079b72bcSJeff Mahoney int ret; 12301bae3098SDavid Sterba 1231e3fe4e71SGreg KH btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj); 1232e3fe4e71SGreg KH if (!btrfs_kset) 1233e3fe4e71SGreg KH return -ENOMEM; 1234079b72bcSJeff Mahoney 12351bae3098SDavid Sterba init_feature_attrs(); 12361bae3098SDavid Sterba ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); 1237001a648dSFilipe Manana if (ret) 1238001a648dSFilipe Manana goto out2; 1239f902bd3aSMisono Tomohiro ret = sysfs_merge_group(&btrfs_kset->kobj, 1240f902bd3aSMisono Tomohiro &btrfs_static_feature_attr_group); 1241f902bd3aSMisono Tomohiro if (ret) 1242f902bd3aSMisono Tomohiro goto out_remove_group; 1243001a648dSFilipe Manana 12446e369febSDavid Sterba #ifdef CONFIG_BTRFS_DEBUG 12456e369febSDavid Sterba ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_debug_feature_attr_group); 12466e369febSDavid Sterba if (ret) 12476e369febSDavid Sterba goto out2; 12486e369febSDavid Sterba #endif 12496e369febSDavid Sterba 1250001a648dSFilipe Manana return 0; 1251f902bd3aSMisono Tomohiro 1252f902bd3aSMisono Tomohiro out_remove_group: 1253f902bd3aSMisono Tomohiro sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); 1254001a648dSFilipe Manana out2: 1255001a648dSFilipe Manana kset_unregister(btrfs_kset); 12561bae3098SDavid Sterba 12571bae3098SDavid Sterba return ret; 125858176a96SJosef Bacik } 125958176a96SJosef Bacik 1260e67c718bSDavid Sterba void __cold btrfs_exit_sysfs(void) 126158176a96SJosef Bacik { 1262f902bd3aSMisono Tomohiro sysfs_unmerge_group(&btrfs_kset->kobj, 1263f902bd3aSMisono Tomohiro &btrfs_static_feature_attr_group); 1264079b72bcSJeff Mahoney sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); 126571e8978eSDennis Zhou #ifdef CONFIG_BTRFS_DEBUG 126671e8978eSDennis Zhou sysfs_remove_group(&btrfs_kset->kobj, &btrfs_debug_feature_attr_group); 126771e8978eSDennis Zhou #endif 1268e3fe4e71SGreg KH kset_unregister(btrfs_kset); 126958176a96SJosef Bacik } 127055d47414SChris Mason 1271