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> 1158176a96SJosef Bacik #include <linux/kobject.h> 1279da4fa4SJeff Mahoney #include <linux/bug.h> 1358176a96SJosef Bacik 14bae45de0SChris Mason #include "ctree.h" 15bae45de0SChris Mason #include "disk-io.h" 16bae45de0SChris Mason #include "transaction.h" 17079b72bcSJeff Mahoney #include "sysfs.h" 1829e5be24SJeff Mahoney #include "volumes.h" 198719aaaeSJosef Bacik #include "space-info.h" 20aac0023cSJosef Bacik #include "block-group.h" 21079b72bcSJeff Mahoney 22510d7360SJeff Mahoney static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj); 232e7910d6SAnand Jain static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj); 245ac1d209SJeff Mahoney 25510d7360SJeff Mahoney static u64 get_features(struct btrfs_fs_info *fs_info, 26510d7360SJeff Mahoney enum btrfs_feature_set set) 275ac1d209SJeff Mahoney { 28510d7360SJeff Mahoney struct btrfs_super_block *disk_super = fs_info->super_copy; 29510d7360SJeff Mahoney if (set == FEAT_COMPAT) 30510d7360SJeff Mahoney return btrfs_super_compat_flags(disk_super); 31510d7360SJeff Mahoney else if (set == FEAT_COMPAT_RO) 32510d7360SJeff Mahoney return btrfs_super_compat_ro_flags(disk_super); 33510d7360SJeff Mahoney else 34510d7360SJeff Mahoney return btrfs_super_incompat_flags(disk_super); 355ac1d209SJeff Mahoney } 365ac1d209SJeff Mahoney 37ba631941SJeff Mahoney static void set_features(struct btrfs_fs_info *fs_info, 38ba631941SJeff Mahoney enum btrfs_feature_set set, u64 features) 39ba631941SJeff Mahoney { 40ba631941SJeff Mahoney struct btrfs_super_block *disk_super = fs_info->super_copy; 41ba631941SJeff Mahoney if (set == FEAT_COMPAT) 42ba631941SJeff Mahoney btrfs_set_super_compat_flags(disk_super, features); 43ba631941SJeff Mahoney else if (set == FEAT_COMPAT_RO) 44ba631941SJeff Mahoney btrfs_set_super_compat_ro_flags(disk_super, features); 45ba631941SJeff Mahoney else 46ba631941SJeff Mahoney btrfs_set_super_incompat_flags(disk_super, features); 47ba631941SJeff Mahoney } 48ba631941SJeff Mahoney 49ba631941SJeff Mahoney static int can_modify_feature(struct btrfs_feature_attr *fa) 50ba631941SJeff Mahoney { 51ba631941SJeff Mahoney int val = 0; 52ba631941SJeff Mahoney u64 set, clear; 53ba631941SJeff Mahoney switch (fa->feature_set) { 54ba631941SJeff Mahoney case FEAT_COMPAT: 55ba631941SJeff Mahoney set = BTRFS_FEATURE_COMPAT_SAFE_SET; 56ba631941SJeff Mahoney clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR; 57ba631941SJeff Mahoney break; 58ba631941SJeff Mahoney case FEAT_COMPAT_RO: 59ba631941SJeff Mahoney set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET; 60ba631941SJeff Mahoney clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR; 61ba631941SJeff Mahoney break; 62ba631941SJeff Mahoney case FEAT_INCOMPAT: 63ba631941SJeff Mahoney set = BTRFS_FEATURE_INCOMPAT_SAFE_SET; 64ba631941SJeff Mahoney clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR; 65ba631941SJeff Mahoney break; 66ba631941SJeff Mahoney default: 6762e85577SJeff Mahoney pr_warn("btrfs: sysfs: unknown feature set %d\n", 68cc37bb04SDavid Sterba fa->feature_set); 69cc37bb04SDavid Sterba return 0; 70ba631941SJeff Mahoney } 71ba631941SJeff Mahoney 72ba631941SJeff Mahoney if (set & fa->feature_bit) 73ba631941SJeff Mahoney val |= 1; 74ba631941SJeff Mahoney if (clear & fa->feature_bit) 75ba631941SJeff Mahoney val |= 2; 76ba631941SJeff Mahoney 77ba631941SJeff Mahoney return val; 78ba631941SJeff Mahoney } 79ba631941SJeff Mahoney 80079b72bcSJeff Mahoney static ssize_t btrfs_feature_attr_show(struct kobject *kobj, 81079b72bcSJeff Mahoney struct kobj_attribute *a, char *buf) 82079b72bcSJeff Mahoney { 83510d7360SJeff Mahoney int val = 0; 84510d7360SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj); 85510d7360SJeff Mahoney struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a); 86ba631941SJeff Mahoney if (fs_info) { 87510d7360SJeff Mahoney u64 features = get_features(fs_info, fa->feature_set); 88510d7360SJeff Mahoney if (features & fa->feature_bit) 89510d7360SJeff Mahoney val = 1; 90ba631941SJeff Mahoney } else 91ba631941SJeff Mahoney val = can_modify_feature(fa); 92510d7360SJeff Mahoney 93510d7360SJeff Mahoney return snprintf(buf, PAGE_SIZE, "%d\n", val); 94510d7360SJeff Mahoney } 95510d7360SJeff Mahoney 96ba631941SJeff Mahoney static ssize_t btrfs_feature_attr_store(struct kobject *kobj, 97ba631941SJeff Mahoney struct kobj_attribute *a, 98ba631941SJeff Mahoney const char *buf, size_t count) 99ba631941SJeff Mahoney { 100ba631941SJeff Mahoney struct btrfs_fs_info *fs_info; 101ba631941SJeff Mahoney struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a); 102ba631941SJeff Mahoney u64 features, set, clear; 103ba631941SJeff Mahoney unsigned long val; 104ba631941SJeff Mahoney int ret; 105ba631941SJeff Mahoney 106ba631941SJeff Mahoney fs_info = to_fs_info(kobj); 107ba631941SJeff Mahoney if (!fs_info) 108ba631941SJeff Mahoney return -EPERM; 109ba631941SJeff Mahoney 110bc98a42cSDavid Howells if (sb_rdonly(fs_info->sb)) 111ee611138SDavid Sterba return -EROFS; 112ee611138SDavid Sterba 113ba631941SJeff Mahoney ret = kstrtoul(skip_spaces(buf), 0, &val); 114ba631941SJeff Mahoney if (ret) 115ba631941SJeff Mahoney return ret; 116ba631941SJeff Mahoney 117ba631941SJeff Mahoney if (fa->feature_set == FEAT_COMPAT) { 118ba631941SJeff Mahoney set = BTRFS_FEATURE_COMPAT_SAFE_SET; 119ba631941SJeff Mahoney clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR; 120ba631941SJeff Mahoney } else if (fa->feature_set == FEAT_COMPAT_RO) { 121ba631941SJeff Mahoney set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET; 122ba631941SJeff Mahoney clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR; 123ba631941SJeff Mahoney } else { 124ba631941SJeff Mahoney set = BTRFS_FEATURE_INCOMPAT_SAFE_SET; 125ba631941SJeff Mahoney clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR; 126ba631941SJeff Mahoney } 127ba631941SJeff Mahoney 128ba631941SJeff Mahoney features = get_features(fs_info, fa->feature_set); 129ba631941SJeff Mahoney 130ba631941SJeff Mahoney /* Nothing to do */ 131ba631941SJeff Mahoney if ((val && (features & fa->feature_bit)) || 132ba631941SJeff Mahoney (!val && !(features & fa->feature_bit))) 133ba631941SJeff Mahoney return count; 134ba631941SJeff Mahoney 135ba631941SJeff Mahoney if ((val && !(set & fa->feature_bit)) || 136ba631941SJeff Mahoney (!val && !(clear & fa->feature_bit))) { 137ba631941SJeff Mahoney btrfs_info(fs_info, 138ba631941SJeff Mahoney "%sabling feature %s on mounted fs is not supported.", 139ba631941SJeff Mahoney val ? "En" : "Dis", fa->kobj_attr.attr.name); 140ba631941SJeff Mahoney return -EPERM; 141ba631941SJeff Mahoney } 142ba631941SJeff Mahoney 143ba631941SJeff Mahoney btrfs_info(fs_info, "%s %s feature flag", 144ba631941SJeff Mahoney val ? "Setting" : "Clearing", fa->kobj_attr.attr.name); 145ba631941SJeff Mahoney 146ba631941SJeff Mahoney spin_lock(&fs_info->super_lock); 147ba631941SJeff Mahoney features = get_features(fs_info, fa->feature_set); 148ba631941SJeff Mahoney if (val) 149ba631941SJeff Mahoney features |= fa->feature_bit; 150ba631941SJeff Mahoney else 151ba631941SJeff Mahoney features &= ~fa->feature_bit; 152ba631941SJeff Mahoney set_features(fs_info, fa->feature_set, features); 153ba631941SJeff Mahoney spin_unlock(&fs_info->super_lock); 154ba631941SJeff Mahoney 1550eae2747SDavid Sterba /* 1560eae2747SDavid Sterba * We don't want to do full transaction commit from inside sysfs 1570eae2747SDavid Sterba */ 1580eae2747SDavid Sterba btrfs_set_pending(fs_info, COMMIT); 1590eae2747SDavid Sterba wake_up_process(fs_info->transaction_kthread); 160ba631941SJeff Mahoney 161ba631941SJeff Mahoney return count; 162ba631941SJeff Mahoney } 163ba631941SJeff Mahoney 164510d7360SJeff Mahoney static umode_t btrfs_feature_visible(struct kobject *kobj, 165510d7360SJeff Mahoney struct attribute *attr, int unused) 166510d7360SJeff Mahoney { 167510d7360SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj); 168510d7360SJeff Mahoney umode_t mode = attr->mode; 169510d7360SJeff Mahoney 170510d7360SJeff Mahoney if (fs_info) { 171510d7360SJeff Mahoney struct btrfs_feature_attr *fa; 172510d7360SJeff Mahoney u64 features; 173510d7360SJeff Mahoney 174510d7360SJeff Mahoney fa = attr_to_btrfs_feature_attr(attr); 175510d7360SJeff Mahoney features = get_features(fs_info, fa->feature_set); 176510d7360SJeff Mahoney 177ba631941SJeff Mahoney if (can_modify_feature(fa)) 178ba631941SJeff Mahoney mode |= S_IWUSR; 179ba631941SJeff Mahoney else if (!(features & fa->feature_bit)) 180510d7360SJeff Mahoney mode = 0; 181510d7360SJeff Mahoney } 182510d7360SJeff Mahoney 183510d7360SJeff Mahoney return mode; 184079b72bcSJeff Mahoney } 185079b72bcSJeff Mahoney 186079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(mixed_backref, MIXED_BACKREF); 187079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(default_subvol, DEFAULT_SUBVOL); 188079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(mixed_groups, MIXED_GROUPS); 189079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(compress_lzo, COMPRESS_LZO); 1905c1aab1dSNick Terrell BTRFS_FEAT_ATTR_INCOMPAT(compress_zstd, COMPRESS_ZSTD); 191079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(big_metadata, BIG_METADATA); 192079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(extended_iref, EXTENDED_IREF); 193079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(raid56, RAID56); 194079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(skinny_metadata, SKINNY_METADATA); 195c736c095SDavid Sterba BTRFS_FEAT_ATTR_INCOMPAT(no_holes, NO_HOLES); 19656f20f40SNikolay Borisov BTRFS_FEAT_ATTR_INCOMPAT(metadata_uuid, METADATA_UUID); 1973b5bb73bSDavid Sterba BTRFS_FEAT_ATTR_COMPAT_RO(free_space_tree, FREE_SPACE_TREE); 198079b72bcSJeff Mahoney 199079b72bcSJeff Mahoney static struct attribute *btrfs_supported_feature_attrs[] = { 200079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(mixed_backref), 201079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(default_subvol), 202079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(mixed_groups), 203079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(compress_lzo), 2045c1aab1dSNick Terrell BTRFS_FEAT_ATTR_PTR(compress_zstd), 205079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(big_metadata), 206079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(extended_iref), 207079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(raid56), 208079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(skinny_metadata), 209c736c095SDavid Sterba BTRFS_FEAT_ATTR_PTR(no_holes), 21056f20f40SNikolay Borisov BTRFS_FEAT_ATTR_PTR(metadata_uuid), 2113b5bb73bSDavid Sterba BTRFS_FEAT_ATTR_PTR(free_space_tree), 212079b72bcSJeff Mahoney NULL 213079b72bcSJeff Mahoney }; 214079b72bcSJeff Mahoney 215f902bd3aSMisono Tomohiro /* 216f902bd3aSMisono Tomohiro * Features which depend on feature bits and may differ between each fs. 217f902bd3aSMisono Tomohiro * 218f902bd3aSMisono Tomohiro * /sys/fs/btrfs/features lists all available features of this kernel while 219f902bd3aSMisono Tomohiro * /sys/fs/btrfs/UUID/features shows features of the fs which are enabled or 220f902bd3aSMisono Tomohiro * can be changed online. 221f902bd3aSMisono Tomohiro */ 222079b72bcSJeff Mahoney static const struct attribute_group btrfs_feature_attr_group = { 223079b72bcSJeff Mahoney .name = "features", 224510d7360SJeff Mahoney .is_visible = btrfs_feature_visible, 225079b72bcSJeff Mahoney .attrs = btrfs_supported_feature_attrs, 226079b72bcSJeff Mahoney }; 22758176a96SJosef Bacik 228f902bd3aSMisono Tomohiro static ssize_t rmdir_subvol_show(struct kobject *kobj, 229f902bd3aSMisono Tomohiro struct kobj_attribute *ka, char *buf) 230f902bd3aSMisono Tomohiro { 231f902bd3aSMisono Tomohiro return snprintf(buf, PAGE_SIZE, "0\n"); 232f902bd3aSMisono Tomohiro } 233f902bd3aSMisono Tomohiro BTRFS_ATTR(static_feature, rmdir_subvol, rmdir_subvol_show); 234f902bd3aSMisono Tomohiro 235f902bd3aSMisono Tomohiro static struct attribute *btrfs_supported_static_feature_attrs[] = { 236f902bd3aSMisono Tomohiro BTRFS_ATTR_PTR(static_feature, rmdir_subvol), 237f902bd3aSMisono Tomohiro NULL 238f902bd3aSMisono Tomohiro }; 239f902bd3aSMisono Tomohiro 240f902bd3aSMisono Tomohiro /* 241f902bd3aSMisono Tomohiro * Features which only depend on kernel version. 242f902bd3aSMisono Tomohiro * 243f902bd3aSMisono Tomohiro * These are listed in /sys/fs/btrfs/features along with 244f902bd3aSMisono Tomohiro * btrfs_feature_attr_group 245f902bd3aSMisono Tomohiro */ 246f902bd3aSMisono Tomohiro static const struct attribute_group btrfs_static_feature_attr_group = { 247f902bd3aSMisono Tomohiro .name = "features", 248f902bd3aSMisono Tomohiro .attrs = btrfs_supported_static_feature_attrs, 249f902bd3aSMisono Tomohiro }; 250f902bd3aSMisono Tomohiro 2516e369febSDavid Sterba #ifdef CONFIG_BTRFS_DEBUG 2526e369febSDavid Sterba 2536e369febSDavid Sterba /* 2546e369febSDavid Sterba * Runtime debugging exported via sysfs 2556e369febSDavid Sterba * 2566e369febSDavid Sterba * /sys/fs/btrfs/debug - applies to module or all filesystems 2576e369febSDavid Sterba * /sys/fs/btrfs/UUID - applies only to the given filesystem 2586e369febSDavid Sterba */ 2596e369febSDavid Sterba static struct attribute *btrfs_debug_feature_attrs[] = { 2606e369febSDavid Sterba NULL 2616e369febSDavid Sterba }; 2626e369febSDavid Sterba 2636e369febSDavid Sterba static const struct attribute_group btrfs_debug_feature_attr_group = { 2646e369febSDavid Sterba .name = "debug", 2656e369febSDavid Sterba .attrs = btrfs_debug_feature_attrs, 2666e369febSDavid Sterba }; 2676e369febSDavid Sterba 2686e369febSDavid Sterba #endif 2696e369febSDavid Sterba 2706ab0a202SJeff Mahoney static ssize_t btrfs_show_u64(u64 *value_ptr, spinlock_t *lock, char *buf) 2716ab0a202SJeff Mahoney { 2726ab0a202SJeff Mahoney u64 val; 2736ab0a202SJeff Mahoney if (lock) 2746ab0a202SJeff Mahoney spin_lock(lock); 2756ab0a202SJeff Mahoney val = *value_ptr; 2766ab0a202SJeff Mahoney if (lock) 2776ab0a202SJeff Mahoney spin_unlock(lock); 2786ab0a202SJeff Mahoney return snprintf(buf, PAGE_SIZE, "%llu\n", val); 2796ab0a202SJeff Mahoney } 2806ab0a202SJeff Mahoney 2816ab0a202SJeff Mahoney static ssize_t global_rsv_size_show(struct kobject *kobj, 2826ab0a202SJeff Mahoney struct kobj_attribute *ka, char *buf) 2836ab0a202SJeff Mahoney { 2846ab0a202SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); 2856ab0a202SJeff Mahoney struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 2866ab0a202SJeff Mahoney return btrfs_show_u64(&block_rsv->size, &block_rsv->lock, buf); 2876ab0a202SJeff Mahoney } 288a969f4ccSHans van Kranenburg BTRFS_ATTR(allocation, global_rsv_size, global_rsv_size_show); 2896ab0a202SJeff Mahoney 2906ab0a202SJeff Mahoney static ssize_t global_rsv_reserved_show(struct kobject *kobj, 2916ab0a202SJeff Mahoney struct kobj_attribute *a, char *buf) 2926ab0a202SJeff Mahoney { 2936ab0a202SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); 2946ab0a202SJeff Mahoney struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 2956ab0a202SJeff Mahoney return btrfs_show_u64(&block_rsv->reserved, &block_rsv->lock, buf); 2966ab0a202SJeff Mahoney } 297a969f4ccSHans van Kranenburg BTRFS_ATTR(allocation, global_rsv_reserved, global_rsv_reserved_show); 2986ab0a202SJeff Mahoney 2996ab0a202SJeff Mahoney #define to_space_info(_kobj) container_of(_kobj, struct btrfs_space_info, kobj) 300c1895442SJeff Mahoney #define to_raid_kobj(_kobj) container_of(_kobj, struct raid_kobject, kobj) 3016ab0a202SJeff Mahoney 3026ab0a202SJeff Mahoney static ssize_t raid_bytes_show(struct kobject *kobj, 3036ab0a202SJeff Mahoney struct kobj_attribute *attr, char *buf); 304a969f4ccSHans van Kranenburg BTRFS_ATTR(raid, total_bytes, raid_bytes_show); 305a969f4ccSHans van Kranenburg BTRFS_ATTR(raid, used_bytes, raid_bytes_show); 3066ab0a202SJeff Mahoney 3076ab0a202SJeff Mahoney static ssize_t raid_bytes_show(struct kobject *kobj, 3086ab0a202SJeff Mahoney struct kobj_attribute *attr, char *buf) 3096ab0a202SJeff Mahoney 3106ab0a202SJeff Mahoney { 3116ab0a202SJeff Mahoney struct btrfs_space_info *sinfo = to_space_info(kobj->parent); 3126ab0a202SJeff Mahoney struct btrfs_block_group_cache *block_group; 31375cb379dSJeff Mahoney int index = btrfs_bg_flags_to_raid_index(to_raid_kobj(kobj)->flags); 3146ab0a202SJeff Mahoney u64 val = 0; 3156ab0a202SJeff Mahoney 3166ab0a202SJeff Mahoney down_read(&sinfo->groups_sem); 3176ab0a202SJeff Mahoney list_for_each_entry(block_group, &sinfo->block_groups[index], list) { 318a969f4ccSHans van Kranenburg if (&attr->attr == BTRFS_ATTR_PTR(raid, total_bytes)) 3196ab0a202SJeff Mahoney val += block_group->key.offset; 3206ab0a202SJeff Mahoney else 3216ab0a202SJeff Mahoney val += btrfs_block_group_used(&block_group->item); 3226ab0a202SJeff Mahoney } 3236ab0a202SJeff Mahoney up_read(&sinfo->groups_sem); 3246ab0a202SJeff Mahoney return snprintf(buf, PAGE_SIZE, "%llu\n", val); 3256ab0a202SJeff Mahoney } 3266ab0a202SJeff Mahoney 3277c7e3014SKimberly Brown static struct attribute *raid_attrs[] = { 328a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(raid, total_bytes), 329a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(raid, used_bytes), 3306ab0a202SJeff Mahoney NULL 3316ab0a202SJeff Mahoney }; 3327c7e3014SKimberly Brown ATTRIBUTE_GROUPS(raid); 3336ab0a202SJeff Mahoney 3346ab0a202SJeff Mahoney static void release_raid_kobj(struct kobject *kobj) 3356ab0a202SJeff Mahoney { 336c1895442SJeff Mahoney kfree(to_raid_kobj(kobj)); 3376ab0a202SJeff Mahoney } 3386ab0a202SJeff Mahoney 339536ea45cSDavid Sterba static struct kobj_type btrfs_raid_ktype = { 3406ab0a202SJeff Mahoney .sysfs_ops = &kobj_sysfs_ops, 3416ab0a202SJeff Mahoney .release = release_raid_kobj, 3427c7e3014SKimberly Brown .default_groups = raid_groups, 3436ab0a202SJeff Mahoney }; 3446ab0a202SJeff Mahoney 3456ab0a202SJeff Mahoney #define SPACE_INFO_ATTR(field) \ 3466ab0a202SJeff Mahoney static ssize_t btrfs_space_info_show_##field(struct kobject *kobj, \ 3476ab0a202SJeff Mahoney struct kobj_attribute *a, \ 3486ab0a202SJeff Mahoney char *buf) \ 3496ab0a202SJeff Mahoney { \ 3506ab0a202SJeff Mahoney struct btrfs_space_info *sinfo = to_space_info(kobj); \ 3516ab0a202SJeff Mahoney return btrfs_show_u64(&sinfo->field, &sinfo->lock, buf); \ 3526ab0a202SJeff Mahoney } \ 353a969f4ccSHans van Kranenburg BTRFS_ATTR(space_info, field, btrfs_space_info_show_##field) 3546ab0a202SJeff Mahoney 3556ab0a202SJeff Mahoney static ssize_t btrfs_space_info_show_total_bytes_pinned(struct kobject *kobj, 3566ab0a202SJeff Mahoney struct kobj_attribute *a, 3576ab0a202SJeff Mahoney char *buf) 3586ab0a202SJeff Mahoney { 3596ab0a202SJeff Mahoney struct btrfs_space_info *sinfo = to_space_info(kobj); 3606ab0a202SJeff Mahoney s64 val = percpu_counter_sum(&sinfo->total_bytes_pinned); 3616ab0a202SJeff Mahoney return snprintf(buf, PAGE_SIZE, "%lld\n", val); 3626ab0a202SJeff Mahoney } 3636ab0a202SJeff Mahoney 3646ab0a202SJeff Mahoney SPACE_INFO_ATTR(flags); 3656ab0a202SJeff Mahoney SPACE_INFO_ATTR(total_bytes); 3666ab0a202SJeff Mahoney SPACE_INFO_ATTR(bytes_used); 3676ab0a202SJeff Mahoney SPACE_INFO_ATTR(bytes_pinned); 3686ab0a202SJeff Mahoney SPACE_INFO_ATTR(bytes_reserved); 3696ab0a202SJeff Mahoney SPACE_INFO_ATTR(bytes_may_use); 370c1fd5c30SWang Xiaoguang SPACE_INFO_ATTR(bytes_readonly); 3716ab0a202SJeff Mahoney SPACE_INFO_ATTR(disk_used); 3726ab0a202SJeff Mahoney SPACE_INFO_ATTR(disk_total); 373a969f4ccSHans van Kranenburg BTRFS_ATTR(space_info, total_bytes_pinned, 374a969f4ccSHans van Kranenburg btrfs_space_info_show_total_bytes_pinned); 3756ab0a202SJeff Mahoney 3766ab0a202SJeff Mahoney static struct attribute *space_info_attrs[] = { 377a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, flags), 378a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, total_bytes), 379a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, bytes_used), 380a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, bytes_pinned), 381a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, bytes_reserved), 382a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, bytes_may_use), 383a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, bytes_readonly), 384a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, disk_used), 385a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, disk_total), 386a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, total_bytes_pinned), 3876ab0a202SJeff Mahoney NULL, 3886ab0a202SJeff Mahoney }; 3897c7e3014SKimberly Brown ATTRIBUTE_GROUPS(space_info); 3906ab0a202SJeff Mahoney 3916ab0a202SJeff Mahoney static void space_info_release(struct kobject *kobj) 3926ab0a202SJeff Mahoney { 3936ab0a202SJeff Mahoney struct btrfs_space_info *sinfo = to_space_info(kobj); 3946ab0a202SJeff Mahoney percpu_counter_destroy(&sinfo->total_bytes_pinned); 3956ab0a202SJeff Mahoney kfree(sinfo); 3966ab0a202SJeff Mahoney } 3976ab0a202SJeff Mahoney 39827992d01SDavid Sterba static struct kobj_type space_info_ktype = { 3996ab0a202SJeff Mahoney .sysfs_ops = &kobj_sysfs_ops, 4006ab0a202SJeff Mahoney .release = space_info_release, 4017c7e3014SKimberly Brown .default_groups = space_info_groups, 4026ab0a202SJeff Mahoney }; 4036ab0a202SJeff Mahoney 4046ab0a202SJeff Mahoney static const struct attribute *allocation_attrs[] = { 405a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(allocation, global_rsv_reserved), 406a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(allocation, global_rsv_size), 4076ab0a202SJeff Mahoney NULL, 4086ab0a202SJeff Mahoney }; 4096ab0a202SJeff Mahoney 410f8ba9c11SJeff Mahoney static ssize_t btrfs_label_show(struct kobject *kobj, 411f8ba9c11SJeff Mahoney struct kobj_attribute *a, char *buf) 412f8ba9c11SJeff Mahoney { 413f8ba9c11SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj); 41448fcc3ffSSatoru Takeuchi char *label = fs_info->super_copy->label; 415ee17fc80SDavid Sterba ssize_t ret; 416ee17fc80SDavid Sterba 417ee17fc80SDavid Sterba spin_lock(&fs_info->super_lock); 418ee17fc80SDavid Sterba ret = snprintf(buf, PAGE_SIZE, label[0] ? "%s\n" : "%s", label); 419ee17fc80SDavid Sterba spin_unlock(&fs_info->super_lock); 420ee17fc80SDavid Sterba 421ee17fc80SDavid Sterba return ret; 422f8ba9c11SJeff Mahoney } 423f8ba9c11SJeff Mahoney 424f8ba9c11SJeff Mahoney static ssize_t btrfs_label_store(struct kobject *kobj, 425f8ba9c11SJeff Mahoney struct kobj_attribute *a, 426f8ba9c11SJeff Mahoney const char *buf, size_t len) 427f8ba9c11SJeff Mahoney { 428f8ba9c11SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj); 42948fcc3ffSSatoru Takeuchi size_t p_len; 430f8ba9c11SJeff Mahoney 43166ac9fe7SDavid Sterba if (!fs_info) 43266ac9fe7SDavid Sterba return -EPERM; 43366ac9fe7SDavid Sterba 434bc98a42cSDavid Howells if (sb_rdonly(fs_info->sb)) 43579aec2b8SAnand Jain return -EROFS; 43679aec2b8SAnand Jain 43748fcc3ffSSatoru Takeuchi /* 43848fcc3ffSSatoru Takeuchi * p_len is the len until the first occurrence of either 43948fcc3ffSSatoru Takeuchi * '\n' or '\0' 44048fcc3ffSSatoru Takeuchi */ 44148fcc3ffSSatoru Takeuchi p_len = strcspn(buf, "\n"); 44248fcc3ffSSatoru Takeuchi 44348fcc3ffSSatoru Takeuchi if (p_len >= BTRFS_LABEL_SIZE) 444f8ba9c11SJeff Mahoney return -EINVAL; 445f8ba9c11SJeff Mahoney 446a6f69dc8SDavid Sterba spin_lock(&fs_info->super_lock); 44748fcc3ffSSatoru Takeuchi memset(fs_info->super_copy->label, 0, BTRFS_LABEL_SIZE); 44848fcc3ffSSatoru Takeuchi memcpy(fs_info->super_copy->label, buf, p_len); 449a6f69dc8SDavid Sterba spin_unlock(&fs_info->super_lock); 450f8ba9c11SJeff Mahoney 451a6f69dc8SDavid Sterba /* 452a6f69dc8SDavid Sterba * We don't want to do full transaction commit from inside sysfs 453a6f69dc8SDavid Sterba */ 454a6f69dc8SDavid Sterba btrfs_set_pending(fs_info, COMMIT); 455a6f69dc8SDavid Sterba wake_up_process(fs_info->transaction_kthread); 456a6f69dc8SDavid Sterba 457f8ba9c11SJeff Mahoney return len; 458f8ba9c11SJeff Mahoney } 459a969f4ccSHans van Kranenburg BTRFS_ATTR_RW(, label, btrfs_label_show, btrfs_label_store); 460f8ba9c11SJeff Mahoney 461df93589aSDavid Sterba static ssize_t btrfs_nodesize_show(struct kobject *kobj, 462df93589aSDavid Sterba struct kobj_attribute *a, char *buf) 463df93589aSDavid Sterba { 464df93589aSDavid Sterba struct btrfs_fs_info *fs_info = to_fs_info(kobj); 465df93589aSDavid Sterba 466093e037cSDavid Sterba return snprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->nodesize); 467df93589aSDavid Sterba } 468df93589aSDavid Sterba 469a969f4ccSHans van Kranenburg BTRFS_ATTR(, nodesize, btrfs_nodesize_show); 470df93589aSDavid Sterba 471df93589aSDavid Sterba static ssize_t btrfs_sectorsize_show(struct kobject *kobj, 472df93589aSDavid Sterba struct kobj_attribute *a, char *buf) 473df93589aSDavid Sterba { 474df93589aSDavid Sterba struct btrfs_fs_info *fs_info = to_fs_info(kobj); 475df93589aSDavid Sterba 476093e037cSDavid Sterba return snprintf(buf, PAGE_SIZE, "%u\n", 477093e037cSDavid Sterba fs_info->super_copy->sectorsize); 478df93589aSDavid Sterba } 479df93589aSDavid Sterba 480a969f4ccSHans van Kranenburg BTRFS_ATTR(, sectorsize, btrfs_sectorsize_show); 481df93589aSDavid Sterba 482df93589aSDavid Sterba static ssize_t btrfs_clone_alignment_show(struct kobject *kobj, 483df93589aSDavid Sterba struct kobj_attribute *a, char *buf) 484df93589aSDavid Sterba { 485df93589aSDavid Sterba struct btrfs_fs_info *fs_info = to_fs_info(kobj); 486df93589aSDavid Sterba 487093e037cSDavid Sterba return snprintf(buf, PAGE_SIZE, "%u\n", 488093e037cSDavid Sterba fs_info->super_copy->sectorsize); 489df93589aSDavid Sterba } 490df93589aSDavid Sterba 491a969f4ccSHans van Kranenburg BTRFS_ATTR(, clone_alignment, btrfs_clone_alignment_show); 492df93589aSDavid Sterba 4932723480aSSargun Dhillon static ssize_t quota_override_show(struct kobject *kobj, 4942723480aSSargun Dhillon struct kobj_attribute *a, char *buf) 4952723480aSSargun Dhillon { 4962723480aSSargun Dhillon struct btrfs_fs_info *fs_info = to_fs_info(kobj); 4972723480aSSargun Dhillon int quota_override; 4982723480aSSargun Dhillon 4992723480aSSargun Dhillon quota_override = test_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags); 5002723480aSSargun Dhillon return snprintf(buf, PAGE_SIZE, "%d\n", quota_override); 5012723480aSSargun Dhillon } 5022723480aSSargun Dhillon 5032723480aSSargun Dhillon static ssize_t quota_override_store(struct kobject *kobj, 5042723480aSSargun Dhillon struct kobj_attribute *a, 5052723480aSSargun Dhillon const char *buf, size_t len) 5062723480aSSargun Dhillon { 5072723480aSSargun Dhillon struct btrfs_fs_info *fs_info = to_fs_info(kobj); 5082723480aSSargun Dhillon unsigned long knob; 5092723480aSSargun Dhillon int err; 5102723480aSSargun Dhillon 5112723480aSSargun Dhillon if (!fs_info) 5122723480aSSargun Dhillon return -EPERM; 5132723480aSSargun Dhillon 5142723480aSSargun Dhillon if (!capable(CAP_SYS_RESOURCE)) 5152723480aSSargun Dhillon return -EPERM; 5162723480aSSargun Dhillon 5172723480aSSargun Dhillon err = kstrtoul(buf, 10, &knob); 5182723480aSSargun Dhillon if (err) 5192723480aSSargun Dhillon return err; 5202723480aSSargun Dhillon if (knob > 1) 5212723480aSSargun Dhillon return -EINVAL; 5222723480aSSargun Dhillon 5232723480aSSargun Dhillon if (knob) 5242723480aSSargun Dhillon set_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags); 5252723480aSSargun Dhillon else 5262723480aSSargun Dhillon clear_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags); 5272723480aSSargun Dhillon 5282723480aSSargun Dhillon return len; 5292723480aSSargun Dhillon } 5302723480aSSargun Dhillon 531a969f4ccSHans van Kranenburg BTRFS_ATTR_RW(, quota_override, quota_override_show, quota_override_store); 5322723480aSSargun Dhillon 53356f20f40SNikolay Borisov static ssize_t btrfs_metadata_uuid_show(struct kobject *kobj, 53456f20f40SNikolay Borisov struct kobj_attribute *a, char *buf) 53556f20f40SNikolay Borisov { 53656f20f40SNikolay Borisov struct btrfs_fs_info *fs_info = to_fs_info(kobj); 53756f20f40SNikolay Borisov 53856f20f40SNikolay Borisov return snprintf(buf, PAGE_SIZE, "%pU\n", 53956f20f40SNikolay Borisov fs_info->fs_devices->metadata_uuid); 54056f20f40SNikolay Borisov } 54156f20f40SNikolay Borisov 54256f20f40SNikolay Borisov BTRFS_ATTR(, metadata_uuid, btrfs_metadata_uuid_show); 54356f20f40SNikolay Borisov 5440dd2906fSAnand Jain static const struct attribute *btrfs_attrs[] = { 545a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(, label), 546a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(, nodesize), 547a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(, sectorsize), 548a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(, clone_alignment), 549a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(, quota_override), 55056f20f40SNikolay Borisov BTRFS_ATTR_PTR(, metadata_uuid), 551f8ba9c11SJeff Mahoney NULL, 552f8ba9c11SJeff Mahoney }; 553f8ba9c11SJeff Mahoney 554c1b7e474SAnand Jain static void btrfs_release_fsid_kobj(struct kobject *kobj) 555510d7360SJeff Mahoney { 5562e7910d6SAnand Jain struct btrfs_fs_devices *fs_devs = to_fs_devs(kobj); 557248d200dSAnand Jain 558c1b7e474SAnand Jain memset(&fs_devs->fsid_kobj, 0, sizeof(struct kobject)); 5592e7910d6SAnand Jain complete(&fs_devs->kobj_unregister); 560510d7360SJeff Mahoney } 561510d7360SJeff Mahoney 562510d7360SJeff Mahoney static struct kobj_type btrfs_ktype = { 563510d7360SJeff Mahoney .sysfs_ops = &kobj_sysfs_ops, 564c1b7e474SAnand Jain .release = btrfs_release_fsid_kobj, 565510d7360SJeff Mahoney }; 566510d7360SJeff Mahoney 5672e7910d6SAnand Jain static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj) 5682e7910d6SAnand Jain { 5692e7910d6SAnand Jain if (kobj->ktype != &btrfs_ktype) 5702e7910d6SAnand Jain return NULL; 571c1b7e474SAnand Jain return container_of(kobj, struct btrfs_fs_devices, fsid_kobj); 5722e7910d6SAnand Jain } 5732e7910d6SAnand Jain 574510d7360SJeff Mahoney static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj) 575510d7360SJeff Mahoney { 576510d7360SJeff Mahoney if (kobj->ktype != &btrfs_ktype) 577510d7360SJeff Mahoney return NULL; 5782e7910d6SAnand Jain return to_fs_devs(kobj)->fs_info; 579510d7360SJeff Mahoney } 58058176a96SJosef Bacik 581e453d989SJeff Mahoney #define NUM_FEATURE_BITS 64 5826c52157fSTomohiro Misono #define BTRFS_FEATURE_NAME_MAX 13 5836c52157fSTomohiro Misono static char btrfs_unknown_feature_names[FEAT_MAX][NUM_FEATURE_BITS][BTRFS_FEATURE_NAME_MAX]; 5846c52157fSTomohiro Misono static struct btrfs_feature_attr btrfs_feature_attrs[FEAT_MAX][NUM_FEATURE_BITS]; 585e453d989SJeff Mahoney 5866c52157fSTomohiro Misono static const u64 supported_feature_masks[FEAT_MAX] = { 587e453d989SJeff Mahoney [FEAT_COMPAT] = BTRFS_FEATURE_COMPAT_SUPP, 588e453d989SJeff Mahoney [FEAT_COMPAT_RO] = BTRFS_FEATURE_COMPAT_RO_SUPP, 589e453d989SJeff Mahoney [FEAT_INCOMPAT] = BTRFS_FEATURE_INCOMPAT_SUPP, 590e453d989SJeff Mahoney }; 591e453d989SJeff Mahoney 592e453d989SJeff Mahoney static int addrm_unknown_feature_attrs(struct btrfs_fs_info *fs_info, bool add) 5935ac1d209SJeff Mahoney { 594e453d989SJeff Mahoney int set; 595e453d989SJeff Mahoney 596e453d989SJeff Mahoney for (set = 0; set < FEAT_MAX; set++) { 597e453d989SJeff Mahoney int i; 598e453d989SJeff Mahoney struct attribute *attrs[2]; 599e453d989SJeff Mahoney struct attribute_group agroup = { 600e453d989SJeff Mahoney .name = "features", 601e453d989SJeff Mahoney .attrs = attrs, 602e453d989SJeff Mahoney }; 603e453d989SJeff Mahoney u64 features = get_features(fs_info, set); 604e453d989SJeff Mahoney features &= ~supported_feature_masks[set]; 605e453d989SJeff Mahoney 606e453d989SJeff Mahoney if (!features) 607e453d989SJeff Mahoney continue; 608e453d989SJeff Mahoney 609e453d989SJeff Mahoney attrs[1] = NULL; 610e453d989SJeff Mahoney for (i = 0; i < NUM_FEATURE_BITS; i++) { 611e453d989SJeff Mahoney struct btrfs_feature_attr *fa; 612e453d989SJeff Mahoney 613e453d989SJeff Mahoney if (!(features & (1ULL << i))) 614e453d989SJeff Mahoney continue; 615e453d989SJeff Mahoney 616e453d989SJeff Mahoney fa = &btrfs_feature_attrs[set][i]; 617e453d989SJeff Mahoney attrs[0] = &fa->kobj_attr.attr; 618e453d989SJeff Mahoney if (add) { 619e453d989SJeff Mahoney int ret; 620c1b7e474SAnand Jain ret = sysfs_merge_group(&fs_info->fs_devices->fsid_kobj, 621e453d989SJeff Mahoney &agroup); 622e453d989SJeff Mahoney if (ret) 623e453d989SJeff Mahoney return ret; 624e453d989SJeff Mahoney } else 625c1b7e474SAnand Jain sysfs_unmerge_group(&fs_info->fs_devices->fsid_kobj, 626e453d989SJeff Mahoney &agroup); 627e453d989SJeff Mahoney } 628e453d989SJeff Mahoney 629e453d989SJeff Mahoney } 630e453d989SJeff Mahoney return 0; 631e453d989SJeff Mahoney } 632e453d989SJeff Mahoney 6332e3e1281SAnand Jain static void __btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs) 634e453d989SJeff Mahoney { 6352e7910d6SAnand Jain if (fs_devs->device_dir_kobj) { 6362e7910d6SAnand Jain kobject_del(fs_devs->device_dir_kobj); 6372e7910d6SAnand Jain kobject_put(fs_devs->device_dir_kobj); 6382e7910d6SAnand Jain fs_devs->device_dir_kobj = NULL; 639aaf13305SAnand Jain } 640aaf13305SAnand Jain 641c1b7e474SAnand Jain if (fs_devs->fsid_kobj.state_initialized) { 642c1b7e474SAnand Jain kobject_del(&fs_devs->fsid_kobj); 643c1b7e474SAnand Jain kobject_put(&fs_devs->fsid_kobj); 6442e7910d6SAnand Jain wait_for_completion(&fs_devs->kobj_unregister); 6455ac1d209SJeff Mahoney } 646f90fc547SAnand Jain } 6475ac1d209SJeff Mahoney 6482e3e1281SAnand Jain /* when fs_devs is NULL it will remove all fsid kobject */ 6491d1c1be3SAnand Jain void btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs) 6502e3e1281SAnand Jain { 6512e3e1281SAnand Jain struct list_head *fs_uuids = btrfs_get_fs_uuids(); 6522e3e1281SAnand Jain 6532e3e1281SAnand Jain if (fs_devs) { 6542e3e1281SAnand Jain __btrfs_sysfs_remove_fsid(fs_devs); 6552e3e1281SAnand Jain return; 6562e3e1281SAnand Jain } 6572e3e1281SAnand Jain 658c4babc5eSAnand Jain list_for_each_entry(fs_devs, fs_uuids, fs_list) { 6592e3e1281SAnand Jain __btrfs_sysfs_remove_fsid(fs_devs); 6602e3e1281SAnand Jain } 6612e3e1281SAnand Jain } 6622e3e1281SAnand Jain 6636618a59bSAnand Jain void btrfs_sysfs_remove_mounted(struct btrfs_fs_info *fs_info) 664e453d989SJeff Mahoney { 6655a13f430SAnand Jain btrfs_reset_fs_info_ptr(fs_info); 6665a13f430SAnand Jain 667e453d989SJeff Mahoney if (fs_info->space_info_kobj) { 668e453d989SJeff Mahoney sysfs_remove_files(fs_info->space_info_kobj, allocation_attrs); 669e453d989SJeff Mahoney kobject_del(fs_info->space_info_kobj); 670e453d989SJeff Mahoney kobject_put(fs_info->space_info_kobj); 671e453d989SJeff Mahoney } 672e453d989SJeff Mahoney addrm_unknown_feature_attrs(fs_info, false); 673c1b7e474SAnand Jain sysfs_remove_group(&fs_info->fs_devices->fsid_kobj, &btrfs_feature_attr_group); 674c1b7e474SAnand Jain sysfs_remove_files(&fs_info->fs_devices->fsid_kobj, btrfs_attrs); 67532576040SAnand Jain btrfs_sysfs_rm_device_link(fs_info->fs_devices, NULL); 676e453d989SJeff Mahoney } 677e453d989SJeff Mahoney 678f10152bcSDavid Sterba static const char * const btrfs_feature_set_names[FEAT_MAX] = { 67979da4fa4SJeff Mahoney [FEAT_COMPAT] = "compat", 68079da4fa4SJeff Mahoney [FEAT_COMPAT_RO] = "compat_ro", 68179da4fa4SJeff Mahoney [FEAT_INCOMPAT] = "incompat", 68279da4fa4SJeff Mahoney }; 68379da4fa4SJeff Mahoney 684f10152bcSDavid Sterba const char * const btrfs_feature_set_name(enum btrfs_feature_set set) 685f10152bcSDavid Sterba { 686f10152bcSDavid Sterba return btrfs_feature_set_names[set]; 687f10152bcSDavid Sterba } 688f10152bcSDavid Sterba 6893b02a68aSJeff Mahoney char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags) 6903b02a68aSJeff Mahoney { 6913b02a68aSJeff Mahoney size_t bufsize = 4096; /* safe max, 64 names * 64 bytes */ 6923b02a68aSJeff Mahoney int len = 0; 6933b02a68aSJeff Mahoney int i; 6943b02a68aSJeff Mahoney char *str; 6953b02a68aSJeff Mahoney 6963b02a68aSJeff Mahoney str = kmalloc(bufsize, GFP_KERNEL); 6973b02a68aSJeff Mahoney if (!str) 6983b02a68aSJeff Mahoney return str; 6993b02a68aSJeff Mahoney 7003b02a68aSJeff Mahoney for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { 7013b02a68aSJeff Mahoney const char *name; 7023b02a68aSJeff Mahoney 7033b02a68aSJeff Mahoney if (!(flags & (1ULL << i))) 7043b02a68aSJeff Mahoney continue; 7053b02a68aSJeff Mahoney 7063b02a68aSJeff Mahoney name = btrfs_feature_attrs[set][i].kobj_attr.attr.name; 7073b02a68aSJeff Mahoney len += snprintf(str + len, bufsize - len, "%s%s", 7083b02a68aSJeff Mahoney len ? "," : "", name); 7093b02a68aSJeff Mahoney } 7103b02a68aSJeff Mahoney 7113b02a68aSJeff Mahoney return str; 7123b02a68aSJeff Mahoney } 7133b02a68aSJeff Mahoney 71479da4fa4SJeff Mahoney static void init_feature_attrs(void) 71579da4fa4SJeff Mahoney { 71679da4fa4SJeff Mahoney struct btrfs_feature_attr *fa; 71779da4fa4SJeff Mahoney int set, i; 71879da4fa4SJeff Mahoney 71979da4fa4SJeff Mahoney BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names) != 72079da4fa4SJeff Mahoney ARRAY_SIZE(btrfs_feature_attrs)); 72179da4fa4SJeff Mahoney BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names[0]) != 72279da4fa4SJeff Mahoney ARRAY_SIZE(btrfs_feature_attrs[0])); 72379da4fa4SJeff Mahoney 7243b02a68aSJeff Mahoney memset(btrfs_feature_attrs, 0, sizeof(btrfs_feature_attrs)); 7253b02a68aSJeff Mahoney memset(btrfs_unknown_feature_names, 0, 7263b02a68aSJeff Mahoney sizeof(btrfs_unknown_feature_names)); 7273b02a68aSJeff Mahoney 72879da4fa4SJeff Mahoney for (i = 0; btrfs_supported_feature_attrs[i]; i++) { 72979da4fa4SJeff Mahoney struct btrfs_feature_attr *sfa; 73079da4fa4SJeff Mahoney struct attribute *a = btrfs_supported_feature_attrs[i]; 7313b02a68aSJeff Mahoney int bit; 73279da4fa4SJeff Mahoney sfa = attr_to_btrfs_feature_attr(a); 7333b02a68aSJeff Mahoney bit = ilog2(sfa->feature_bit); 7343b02a68aSJeff Mahoney fa = &btrfs_feature_attrs[sfa->feature_set][bit]; 73579da4fa4SJeff Mahoney 73679da4fa4SJeff Mahoney fa->kobj_attr.attr.name = sfa->kobj_attr.attr.name; 73779da4fa4SJeff Mahoney } 73879da4fa4SJeff Mahoney 73979da4fa4SJeff Mahoney for (set = 0; set < FEAT_MAX; set++) { 74079da4fa4SJeff Mahoney for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { 74179da4fa4SJeff Mahoney char *name = btrfs_unknown_feature_names[set][i]; 74279da4fa4SJeff Mahoney fa = &btrfs_feature_attrs[set][i]; 74379da4fa4SJeff Mahoney 74479da4fa4SJeff Mahoney if (fa->kobj_attr.attr.name) 74579da4fa4SJeff Mahoney continue; 74679da4fa4SJeff Mahoney 7476c52157fSTomohiro Misono snprintf(name, BTRFS_FEATURE_NAME_MAX, "%s:%u", 74879da4fa4SJeff Mahoney btrfs_feature_set_names[set], i); 74979da4fa4SJeff Mahoney 75079da4fa4SJeff Mahoney fa->kobj_attr.attr.name = name; 75179da4fa4SJeff Mahoney fa->kobj_attr.attr.mode = S_IRUGO; 75279da4fa4SJeff Mahoney fa->feature_set = set; 75379da4fa4SJeff Mahoney fa->feature_bit = 1ULL << i; 75479da4fa4SJeff Mahoney } 75579da4fa4SJeff Mahoney } 75679da4fa4SJeff Mahoney } 75779da4fa4SJeff Mahoney 75832a9991fSDavid Sterba /* 75932a9991fSDavid Sterba * Create a sysfs entry for a given block group type at path 76032a9991fSDavid Sterba * /sys/fs/btrfs/UUID/allocation/data/TYPE 76132a9991fSDavid Sterba */ 76232a9991fSDavid Sterba void btrfs_sysfs_add_block_group_type(struct btrfs_block_group_cache *cache) 76332a9991fSDavid Sterba { 76432a9991fSDavid Sterba struct btrfs_fs_info *fs_info = cache->fs_info; 76532a9991fSDavid Sterba struct btrfs_space_info *space_info = cache->space_info; 76632a9991fSDavid Sterba struct raid_kobject *rkobj; 76732a9991fSDavid Sterba const int index = btrfs_bg_flags_to_raid_index(cache->flags); 76832a9991fSDavid Sterba unsigned int nofs_flag; 76932a9991fSDavid Sterba int ret; 77032a9991fSDavid Sterba 77132a9991fSDavid Sterba /* 77232a9991fSDavid Sterba * Setup a NOFS context because kobject_add(), deep in its call chain, 77332a9991fSDavid Sterba * does GFP_KERNEL allocations, and we are often called in a context 77432a9991fSDavid Sterba * where if reclaim is triggered we can deadlock (we are either holding 77532a9991fSDavid Sterba * a transaction handle or some lock required for a transaction 77632a9991fSDavid Sterba * commit). 77732a9991fSDavid Sterba */ 77832a9991fSDavid Sterba nofs_flag = memalloc_nofs_save(); 77932a9991fSDavid Sterba 78032a9991fSDavid Sterba rkobj = kzalloc(sizeof(*rkobj), GFP_NOFS); 78132a9991fSDavid Sterba if (!rkobj) { 78232a9991fSDavid Sterba memalloc_nofs_restore(nofs_flag); 78332a9991fSDavid Sterba btrfs_warn(cache->fs_info, 78432a9991fSDavid Sterba "couldn't alloc memory for raid level kobject"); 78532a9991fSDavid Sterba return; 78632a9991fSDavid Sterba } 78732a9991fSDavid Sterba 78832a9991fSDavid Sterba rkobj->flags = cache->flags; 78932a9991fSDavid Sterba kobject_init(&rkobj->kobj, &btrfs_raid_ktype); 79032a9991fSDavid Sterba ret = kobject_add(&rkobj->kobj, &space_info->kobj, "%s", 79132a9991fSDavid Sterba btrfs_bg_type_to_raid_name(rkobj->flags)); 79232a9991fSDavid Sterba memalloc_nofs_restore(nofs_flag); 79332a9991fSDavid Sterba if (ret) { 79432a9991fSDavid Sterba kobject_put(&rkobj->kobj); 79532a9991fSDavid Sterba btrfs_warn(fs_info, 79632a9991fSDavid Sterba "failed to add kobject for block cache, ignoring"); 79732a9991fSDavid Sterba return; 79832a9991fSDavid Sterba } 79932a9991fSDavid Sterba 80032a9991fSDavid Sterba space_info->block_group_kobjs[index] = &rkobj->kobj; 80132a9991fSDavid Sterba } 80232a9991fSDavid Sterba 803b5865babSDavid Sterba /* 804b5865babSDavid Sterba * Remove sysfs directories for all block group types of a given space info and 805b5865babSDavid Sterba * the space info as well 806b5865babSDavid Sterba */ 807b5865babSDavid Sterba void btrfs_sysfs_remove_space_info(struct btrfs_space_info *space_info) 808b5865babSDavid Sterba { 809b5865babSDavid Sterba int i; 810b5865babSDavid Sterba 811b5865babSDavid Sterba for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) { 812b5865babSDavid Sterba struct kobject *kobj; 813b5865babSDavid Sterba 814b5865babSDavid Sterba kobj = space_info->block_group_kobjs[i]; 815b5865babSDavid Sterba space_info->block_group_kobjs[i] = NULL; 816b5865babSDavid Sterba if (kobj) { 817b5865babSDavid Sterba kobject_del(kobj); 818b5865babSDavid Sterba kobject_put(kobj); 819b5865babSDavid Sterba } 820b5865babSDavid Sterba } 821b5865babSDavid Sterba kobject_del(&space_info->kobj); 822b5865babSDavid Sterba kobject_put(&space_info->kobj); 823b5865babSDavid Sterba } 824b5865babSDavid Sterba 825b882327aSDavid Sterba static const char *alloc_name(u64 flags) 826b882327aSDavid Sterba { 827b882327aSDavid Sterba switch (flags) { 828b882327aSDavid Sterba case BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_DATA: 829b882327aSDavid Sterba return "mixed"; 830b882327aSDavid Sterba case BTRFS_BLOCK_GROUP_METADATA: 831b882327aSDavid Sterba return "metadata"; 832b882327aSDavid Sterba case BTRFS_BLOCK_GROUP_DATA: 833b882327aSDavid Sterba return "data"; 834b882327aSDavid Sterba case BTRFS_BLOCK_GROUP_SYSTEM: 835b882327aSDavid Sterba return "system"; 836b882327aSDavid Sterba default: 837b882327aSDavid Sterba WARN_ON(1); 838b882327aSDavid Sterba return "invalid-combination"; 839b882327aSDavid Sterba }; 840b882327aSDavid Sterba } 841b882327aSDavid Sterba 842b882327aSDavid Sterba /* 843b882327aSDavid Sterba * Create a sysfs entry for a space info type at path 844b882327aSDavid Sterba * /sys/fs/btrfs/UUID/allocation/TYPE 845b882327aSDavid Sterba */ 846b882327aSDavid Sterba int btrfs_sysfs_add_space_info_type(struct btrfs_fs_info *fs_info, 847b882327aSDavid Sterba struct btrfs_space_info *space_info) 848b882327aSDavid Sterba { 849b882327aSDavid Sterba int ret; 850b882327aSDavid Sterba 851b882327aSDavid Sterba ret = kobject_init_and_add(&space_info->kobj, &space_info_ktype, 852b882327aSDavid Sterba fs_info->space_info_kobj, "%s", 853b882327aSDavid Sterba alloc_name(space_info->flags)); 854b882327aSDavid Sterba if (ret) { 855b882327aSDavid Sterba kobject_put(&space_info->kobj); 856b882327aSDavid Sterba return ret; 857b882327aSDavid Sterba } 858b882327aSDavid Sterba 859b882327aSDavid Sterba return 0; 860b882327aSDavid Sterba } 861b882327aSDavid Sterba 862e7e1aa9cSAnand Jain /* when one_device is NULL, it removes all device links */ 863e7e1aa9cSAnand Jain 86432576040SAnand Jain int btrfs_sysfs_rm_device_link(struct btrfs_fs_devices *fs_devices, 86599994cdeSAnand Jain struct btrfs_device *one_device) 86699994cdeSAnand Jain { 86799994cdeSAnand Jain struct hd_struct *disk; 86899994cdeSAnand Jain struct kobject *disk_kobj; 86999994cdeSAnand Jain 8706c14a164SAnand Jain if (!fs_devices->device_dir_kobj) 87199994cdeSAnand Jain return -EINVAL; 87299994cdeSAnand Jain 87387fa3bb0SLiu Bo if (one_device && one_device->bdev) { 87499994cdeSAnand Jain disk = one_device->bdev->bd_part; 87599994cdeSAnand Jain disk_kobj = &part_to_dev(disk)->kobj; 87699994cdeSAnand Jain 8776c14a164SAnand Jain sysfs_remove_link(fs_devices->device_dir_kobj, 87899994cdeSAnand Jain disk_kobj->name); 87999994cdeSAnand Jain } 88099994cdeSAnand Jain 881e7e1aa9cSAnand Jain if (one_device) 882e7e1aa9cSAnand Jain return 0; 883e7e1aa9cSAnand Jain 884e7e1aa9cSAnand Jain list_for_each_entry(one_device, 8856c14a164SAnand Jain &fs_devices->devices, dev_list) { 886e7e1aa9cSAnand Jain if (!one_device->bdev) 887e7e1aa9cSAnand Jain continue; 888e7e1aa9cSAnand Jain disk = one_device->bdev->bd_part; 889e7e1aa9cSAnand Jain disk_kobj = &part_to_dev(disk)->kobj; 890e7e1aa9cSAnand Jain 8916c14a164SAnand Jain sysfs_remove_link(fs_devices->device_dir_kobj, 892e7e1aa9cSAnand Jain disk_kobj->name); 893e7e1aa9cSAnand Jain } 894e7e1aa9cSAnand Jain 89599994cdeSAnand Jain return 0; 89699994cdeSAnand Jain } 89799994cdeSAnand Jain 8982e7910d6SAnand Jain int btrfs_sysfs_add_device(struct btrfs_fs_devices *fs_devs) 89900c921c2SAnand Jain { 9002e7910d6SAnand Jain if (!fs_devs->device_dir_kobj) 9012e7910d6SAnand Jain fs_devs->device_dir_kobj = kobject_create_and_add("devices", 902c1b7e474SAnand Jain &fs_devs->fsid_kobj); 90300c921c2SAnand Jain 9042e7910d6SAnand Jain if (!fs_devs->device_dir_kobj) 90500c921c2SAnand Jain return -ENOMEM; 90600c921c2SAnand Jain 90700c921c2SAnand Jain return 0; 90800c921c2SAnand Jain } 90900c921c2SAnand Jain 910e3bd6973SAnand Jain int btrfs_sysfs_add_device_link(struct btrfs_fs_devices *fs_devices, 9110d39376aSAnand Jain struct btrfs_device *one_device) 91229e5be24SJeff Mahoney { 91329e5be24SJeff Mahoney int error = 0; 91429e5be24SJeff Mahoney struct btrfs_device *dev; 91529e5be24SJeff Mahoney 91629e5be24SJeff Mahoney list_for_each_entry(dev, &fs_devices->devices, dev_list) { 917f085381eSAnand Jain struct hd_struct *disk; 918f085381eSAnand Jain struct kobject *disk_kobj; 919f085381eSAnand Jain 920f085381eSAnand Jain if (!dev->bdev) 921f085381eSAnand Jain continue; 922f085381eSAnand Jain 9230d39376aSAnand Jain if (one_device && one_device != dev) 9240d39376aSAnand Jain continue; 9250d39376aSAnand Jain 926f085381eSAnand Jain disk = dev->bdev->bd_part; 927f085381eSAnand Jain disk_kobj = &part_to_dev(disk)->kobj; 92829e5be24SJeff Mahoney 9292e7910d6SAnand Jain error = sysfs_create_link(fs_devices->device_dir_kobj, 93029e5be24SJeff Mahoney disk_kobj, disk_kobj->name); 93129e5be24SJeff Mahoney if (error) 93229e5be24SJeff Mahoney break; 93329e5be24SJeff Mahoney } 93429e5be24SJeff Mahoney 93529e5be24SJeff Mahoney return error; 93629e5be24SJeff Mahoney } 93729e5be24SJeff Mahoney 9385b28692eSDavid Sterba void btrfs_kobject_uevent(struct block_device *bdev, enum kobject_action action) 9395b28692eSDavid Sterba { 9405b28692eSDavid Sterba int ret; 9415b28692eSDavid Sterba 9425b28692eSDavid Sterba ret = kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, action); 9435b28692eSDavid Sterba if (ret) 9445b28692eSDavid Sterba pr_warn("BTRFS: Sending event '%d' to kobject: '%s' (%p): failed\n", 9455b28692eSDavid Sterba action, kobject_name(&disk_to_dev(bdev->bd_disk)->kobj), 9465b28692eSDavid Sterba &disk_to_dev(bdev->bd_disk)->kobj); 9475b28692eSDavid Sterba } 9485b28692eSDavid Sterba 949f93c3997SDavid Sterba void btrfs_sysfs_update_sprout_fsid(struct btrfs_fs_devices *fs_devices, 950f93c3997SDavid Sterba const u8 *fsid) 951f93c3997SDavid Sterba { 952f93c3997SDavid Sterba char fsid_buf[BTRFS_UUID_UNPARSED_SIZE]; 953f93c3997SDavid Sterba 954f93c3997SDavid Sterba /* 955f93c3997SDavid Sterba * Sprouting changes fsid of the mounted filesystem, rename the fsid 956f93c3997SDavid Sterba * directory 957f93c3997SDavid Sterba */ 958f93c3997SDavid Sterba snprintf(fsid_buf, BTRFS_UUID_UNPARSED_SIZE, "%pU", fsid); 959f93c3997SDavid Sterba if (kobject_rename(&fs_devices->fsid_kobj, fsid_buf)) 960f93c3997SDavid Sterba btrfs_warn(fs_devices->fs_info, 961f93c3997SDavid Sterba "sysfs: failed to create fsid for sprout"); 962f93c3997SDavid Sterba } 963f93c3997SDavid Sterba 964510d7360SJeff Mahoney /* /sys/fs/btrfs/ entry */ 965510d7360SJeff Mahoney static struct kset *btrfs_kset; 966510d7360SJeff Mahoney 96772059215SAnand Jain /* 96872059215SAnand Jain * Can be called by the device discovery thread. 96972059215SAnand Jain * And parent can be specified for seed device 97072059215SAnand Jain */ 9710c10e2d4SAnand Jain int btrfs_sysfs_add_fsid(struct btrfs_fs_devices *fs_devs, 97272059215SAnand Jain struct kobject *parent) 9735ac1d209SJeff Mahoney { 9745ac1d209SJeff Mahoney int error; 9755ac1d209SJeff Mahoney 9762e7910d6SAnand Jain init_completion(&fs_devs->kobj_unregister); 977c1b7e474SAnand Jain fs_devs->fsid_kobj.kset = btrfs_kset; 978c1b7e474SAnand Jain error = kobject_init_and_add(&fs_devs->fsid_kobj, 97924bd69cbSAnand Jain &btrfs_ktype, parent, "%pU", fs_devs->fsid); 980e3277335STobin C. Harding if (error) { 981e3277335STobin C. Harding kobject_put(&fs_devs->fsid_kobj); 98272059215SAnand Jain return error; 98372059215SAnand Jain } 98472059215SAnand Jain 985e3277335STobin C. Harding return 0; 986e3277335STobin C. Harding } 987e3277335STobin C. Harding 98896f3136eSAnand Jain int btrfs_sysfs_add_mounted(struct btrfs_fs_info *fs_info) 98972059215SAnand Jain { 99072059215SAnand Jain int error; 9912e7910d6SAnand Jain struct btrfs_fs_devices *fs_devs = fs_info->fs_devices; 992c1b7e474SAnand Jain struct kobject *fsid_kobj = &fs_devs->fsid_kobj; 99372059215SAnand Jain 9945a13f430SAnand Jain btrfs_set_fs_info_ptr(fs_info); 9955a13f430SAnand Jain 996e3bd6973SAnand Jain error = btrfs_sysfs_add_device_link(fs_devs, NULL); 997e453d989SJeff Mahoney if (error) 998e453d989SJeff Mahoney return error; 999510d7360SJeff Mahoney 1000c1b7e474SAnand Jain error = sysfs_create_files(fsid_kobj, btrfs_attrs); 1001e453d989SJeff Mahoney if (error) { 100232576040SAnand Jain btrfs_sysfs_rm_device_link(fs_devs, NULL); 1003e453d989SJeff Mahoney return error; 1004e453d989SJeff Mahoney } 100579da4fa4SJeff Mahoney 1006c1b7e474SAnand Jain error = sysfs_create_group(fsid_kobj, 10070dd2906fSAnand Jain &btrfs_feature_attr_group); 10080dd2906fSAnand Jain if (error) 10090dd2906fSAnand Jain goto failure; 10100dd2906fSAnand Jain 10116e369febSDavid Sterba #ifdef CONFIG_BTRFS_DEBUG 10126e369febSDavid Sterba error = sysfs_create_group(fsid_kobj, 10136e369febSDavid Sterba &btrfs_debug_feature_attr_group); 10146e369febSDavid Sterba if (error) 10156e369febSDavid Sterba goto failure; 10166e369febSDavid Sterba #endif 10176e369febSDavid Sterba 1018e453d989SJeff Mahoney error = addrm_unknown_feature_attrs(fs_info, true); 101979da4fa4SJeff Mahoney if (error) 102079da4fa4SJeff Mahoney goto failure; 102179da4fa4SJeff Mahoney 10226ab0a202SJeff Mahoney fs_info->space_info_kobj = kobject_create_and_add("allocation", 1023c1b7e474SAnand Jain fsid_kobj); 10246ab0a202SJeff Mahoney if (!fs_info->space_info_kobj) { 10256ab0a202SJeff Mahoney error = -ENOMEM; 10266ab0a202SJeff Mahoney goto failure; 10276ab0a202SJeff Mahoney } 10286ab0a202SJeff Mahoney 10296ab0a202SJeff Mahoney error = sysfs_create_files(fs_info->space_info_kobj, allocation_attrs); 10306ab0a202SJeff Mahoney if (error) 10316ab0a202SJeff Mahoney goto failure; 10326ab0a202SJeff Mahoney 103379da4fa4SJeff Mahoney return 0; 103479da4fa4SJeff Mahoney failure: 10356618a59bSAnand Jain btrfs_sysfs_remove_mounted(fs_info); 10365ac1d209SJeff Mahoney return error; 10375ac1d209SJeff Mahoney } 10385ac1d209SJeff Mahoney 1039444e7516SDavid Sterba 1040444e7516SDavid Sterba /* 1041444e7516SDavid Sterba * Change per-fs features in /sys/fs/btrfs/UUID/features to match current 1042444e7516SDavid Sterba * values in superblock. Call after any changes to incompat/compat_ro flags 1043444e7516SDavid Sterba */ 1044444e7516SDavid Sterba void btrfs_sysfs_feature_update(struct btrfs_fs_info *fs_info, 1045444e7516SDavid Sterba u64 bit, enum btrfs_feature_set set) 1046444e7516SDavid Sterba { 1047444e7516SDavid Sterba struct btrfs_fs_devices *fs_devs; 1048444e7516SDavid Sterba struct kobject *fsid_kobj; 1049444e7516SDavid Sterba u64 features; 1050444e7516SDavid Sterba int ret; 1051444e7516SDavid Sterba 1052444e7516SDavid Sterba if (!fs_info) 1053444e7516SDavid Sterba return; 1054444e7516SDavid Sterba 1055444e7516SDavid Sterba features = get_features(fs_info, set); 1056444e7516SDavid Sterba ASSERT(bit & supported_feature_masks[set]); 1057444e7516SDavid Sterba 1058444e7516SDavid Sterba fs_devs = fs_info->fs_devices; 1059444e7516SDavid Sterba fsid_kobj = &fs_devs->fsid_kobj; 1060444e7516SDavid Sterba 1061bf609206SDavid Sterba if (!fsid_kobj->state_initialized) 1062bf609206SDavid Sterba return; 1063bf609206SDavid Sterba 1064444e7516SDavid Sterba /* 1065444e7516SDavid Sterba * FIXME: this is too heavy to update just one value, ideally we'd like 1066444e7516SDavid Sterba * to use sysfs_update_group but some refactoring is needed first. 1067444e7516SDavid Sterba */ 1068444e7516SDavid Sterba sysfs_remove_group(fsid_kobj, &btrfs_feature_attr_group); 1069444e7516SDavid Sterba ret = sysfs_create_group(fsid_kobj, &btrfs_feature_attr_group); 1070444e7516SDavid Sterba } 1071444e7516SDavid Sterba 1072f5c29bd9SLiu Bo int __init btrfs_init_sysfs(void) 107358176a96SJosef Bacik { 1074079b72bcSJeff Mahoney int ret; 10751bae3098SDavid Sterba 1076e3fe4e71SGreg KH btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj); 1077e3fe4e71SGreg KH if (!btrfs_kset) 1078e3fe4e71SGreg KH return -ENOMEM; 1079079b72bcSJeff Mahoney 10801bae3098SDavid Sterba init_feature_attrs(); 10811bae3098SDavid Sterba ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); 1082001a648dSFilipe Manana if (ret) 1083001a648dSFilipe Manana goto out2; 1084f902bd3aSMisono Tomohiro ret = sysfs_merge_group(&btrfs_kset->kobj, 1085f902bd3aSMisono Tomohiro &btrfs_static_feature_attr_group); 1086f902bd3aSMisono Tomohiro if (ret) 1087f902bd3aSMisono Tomohiro goto out_remove_group; 1088001a648dSFilipe Manana 10896e369febSDavid Sterba #ifdef CONFIG_BTRFS_DEBUG 10906e369febSDavid Sterba ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_debug_feature_attr_group); 10916e369febSDavid Sterba if (ret) 10926e369febSDavid Sterba goto out2; 10936e369febSDavid Sterba #endif 10946e369febSDavid Sterba 1095001a648dSFilipe Manana return 0; 1096f902bd3aSMisono Tomohiro 1097f902bd3aSMisono Tomohiro out_remove_group: 1098f902bd3aSMisono Tomohiro sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); 1099001a648dSFilipe Manana out2: 1100001a648dSFilipe Manana kset_unregister(btrfs_kset); 11011bae3098SDavid Sterba 11021bae3098SDavid Sterba return ret; 110358176a96SJosef Bacik } 110458176a96SJosef Bacik 1105e67c718bSDavid Sterba void __cold btrfs_exit_sysfs(void) 110658176a96SJosef Bacik { 1107f902bd3aSMisono Tomohiro sysfs_unmerge_group(&btrfs_kset->kobj, 1108f902bd3aSMisono Tomohiro &btrfs_static_feature_attr_group); 1109079b72bcSJeff Mahoney sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); 1110e3fe4e71SGreg KH kset_unregister(btrfs_kset); 111158176a96SJosef Bacik } 111255d47414SChris Mason 1113