16cbd5570SChris Mason /* 26cbd5570SChris Mason * Copyright (C) 2007 Oracle. All rights reserved. 36cbd5570SChris Mason * 46cbd5570SChris Mason * This program is free software; you can redistribute it and/or 56cbd5570SChris Mason * modify it under the terms of the GNU General Public 66cbd5570SChris Mason * License v2 as published by the Free Software Foundation. 76cbd5570SChris Mason * 86cbd5570SChris Mason * This program is distributed in the hope that it will be useful, 96cbd5570SChris Mason * but WITHOUT ANY WARRANTY; without even the implied warranty of 106cbd5570SChris Mason * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 116cbd5570SChris Mason * General Public License for more details. 126cbd5570SChris Mason * 136cbd5570SChris Mason * You should have received a copy of the GNU General Public 146cbd5570SChris Mason * License along with this program; if not, write to the 156cbd5570SChris Mason * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 166cbd5570SChris Mason * Boston, MA 021110-1307, USA. 176cbd5570SChris Mason */ 186cbd5570SChris Mason 1958176a96SJosef Bacik #include <linux/sched.h> 2058176a96SJosef Bacik #include <linux/slab.h> 2158176a96SJosef Bacik #include <linux/spinlock.h> 2258176a96SJosef Bacik #include <linux/completion.h> 2358176a96SJosef Bacik #include <linux/buffer_head.h> 2458176a96SJosef Bacik #include <linux/kobject.h> 2579da4fa4SJeff Mahoney #include <linux/bug.h> 2629e5be24SJeff Mahoney #include <linux/genhd.h> 271bae3098SDavid Sterba #include <linux/debugfs.h> 2858176a96SJosef Bacik 29bae45de0SChris Mason #include "ctree.h" 30bae45de0SChris Mason #include "disk-io.h" 31bae45de0SChris Mason #include "transaction.h" 32079b72bcSJeff Mahoney #include "sysfs.h" 3329e5be24SJeff Mahoney #include "volumes.h" 34079b72bcSJeff Mahoney 35510d7360SJeff Mahoney static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj); 365ac1d209SJeff Mahoney 37510d7360SJeff Mahoney static u64 get_features(struct btrfs_fs_info *fs_info, 38510d7360SJeff Mahoney enum btrfs_feature_set set) 395ac1d209SJeff Mahoney { 40510d7360SJeff Mahoney struct btrfs_super_block *disk_super = fs_info->super_copy; 41510d7360SJeff Mahoney if (set == FEAT_COMPAT) 42510d7360SJeff Mahoney return btrfs_super_compat_flags(disk_super); 43510d7360SJeff Mahoney else if (set == FEAT_COMPAT_RO) 44510d7360SJeff Mahoney return btrfs_super_compat_ro_flags(disk_super); 45510d7360SJeff Mahoney else 46510d7360SJeff Mahoney return btrfs_super_incompat_flags(disk_super); 475ac1d209SJeff Mahoney } 485ac1d209SJeff Mahoney 49ba631941SJeff Mahoney static void set_features(struct btrfs_fs_info *fs_info, 50ba631941SJeff Mahoney enum btrfs_feature_set set, u64 features) 51ba631941SJeff Mahoney { 52ba631941SJeff Mahoney struct btrfs_super_block *disk_super = fs_info->super_copy; 53ba631941SJeff Mahoney if (set == FEAT_COMPAT) 54ba631941SJeff Mahoney btrfs_set_super_compat_flags(disk_super, features); 55ba631941SJeff Mahoney else if (set == FEAT_COMPAT_RO) 56ba631941SJeff Mahoney btrfs_set_super_compat_ro_flags(disk_super, features); 57ba631941SJeff Mahoney else 58ba631941SJeff Mahoney btrfs_set_super_incompat_flags(disk_super, features); 59ba631941SJeff Mahoney } 60ba631941SJeff Mahoney 61ba631941SJeff Mahoney static int can_modify_feature(struct btrfs_feature_attr *fa) 62ba631941SJeff Mahoney { 63ba631941SJeff Mahoney int val = 0; 64ba631941SJeff Mahoney u64 set, clear; 65ba631941SJeff Mahoney switch (fa->feature_set) { 66ba631941SJeff Mahoney case FEAT_COMPAT: 67ba631941SJeff Mahoney set = BTRFS_FEATURE_COMPAT_SAFE_SET; 68ba631941SJeff Mahoney clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR; 69ba631941SJeff Mahoney break; 70ba631941SJeff Mahoney case FEAT_COMPAT_RO: 71ba631941SJeff Mahoney set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET; 72ba631941SJeff Mahoney clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR; 73ba631941SJeff Mahoney break; 74ba631941SJeff Mahoney case FEAT_INCOMPAT: 75ba631941SJeff Mahoney set = BTRFS_FEATURE_INCOMPAT_SAFE_SET; 76ba631941SJeff Mahoney clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR; 77ba631941SJeff Mahoney break; 78ba631941SJeff Mahoney default: 79cc37bb04SDavid Sterba printk(KERN_WARNING "btrfs: sysfs: unknown feature set %d\n", 80cc37bb04SDavid Sterba fa->feature_set); 81cc37bb04SDavid Sterba return 0; 82ba631941SJeff Mahoney } 83ba631941SJeff Mahoney 84ba631941SJeff Mahoney if (set & fa->feature_bit) 85ba631941SJeff Mahoney val |= 1; 86ba631941SJeff Mahoney if (clear & fa->feature_bit) 87ba631941SJeff Mahoney val |= 2; 88ba631941SJeff Mahoney 89ba631941SJeff Mahoney return val; 90ba631941SJeff Mahoney } 91ba631941SJeff Mahoney 92079b72bcSJeff Mahoney static ssize_t btrfs_feature_attr_show(struct kobject *kobj, 93079b72bcSJeff Mahoney struct kobj_attribute *a, char *buf) 94079b72bcSJeff Mahoney { 95510d7360SJeff Mahoney int val = 0; 96510d7360SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj); 97510d7360SJeff Mahoney struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a); 98ba631941SJeff Mahoney if (fs_info) { 99510d7360SJeff Mahoney u64 features = get_features(fs_info, fa->feature_set); 100510d7360SJeff Mahoney if (features & fa->feature_bit) 101510d7360SJeff Mahoney val = 1; 102ba631941SJeff Mahoney } else 103ba631941SJeff Mahoney val = can_modify_feature(fa); 104510d7360SJeff Mahoney 105510d7360SJeff Mahoney return snprintf(buf, PAGE_SIZE, "%d\n", val); 106510d7360SJeff Mahoney } 107510d7360SJeff Mahoney 108ba631941SJeff Mahoney static ssize_t btrfs_feature_attr_store(struct kobject *kobj, 109ba631941SJeff Mahoney struct kobj_attribute *a, 110ba631941SJeff Mahoney const char *buf, size_t count) 111ba631941SJeff Mahoney { 112ba631941SJeff Mahoney struct btrfs_fs_info *fs_info; 113ba631941SJeff Mahoney struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a); 114ba631941SJeff Mahoney u64 features, set, clear; 115ba631941SJeff Mahoney unsigned long val; 116ba631941SJeff Mahoney int ret; 117ba631941SJeff Mahoney 118ba631941SJeff Mahoney fs_info = to_fs_info(kobj); 119ba631941SJeff Mahoney if (!fs_info) 120ba631941SJeff Mahoney return -EPERM; 121ba631941SJeff Mahoney 122ba631941SJeff Mahoney ret = kstrtoul(skip_spaces(buf), 0, &val); 123ba631941SJeff Mahoney if (ret) 124ba631941SJeff Mahoney return ret; 125ba631941SJeff Mahoney 126ba631941SJeff Mahoney if (fa->feature_set == FEAT_COMPAT) { 127ba631941SJeff Mahoney set = BTRFS_FEATURE_COMPAT_SAFE_SET; 128ba631941SJeff Mahoney clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR; 129ba631941SJeff Mahoney } else if (fa->feature_set == FEAT_COMPAT_RO) { 130ba631941SJeff Mahoney set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET; 131ba631941SJeff Mahoney clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR; 132ba631941SJeff Mahoney } else { 133ba631941SJeff Mahoney set = BTRFS_FEATURE_INCOMPAT_SAFE_SET; 134ba631941SJeff Mahoney clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR; 135ba631941SJeff Mahoney } 136ba631941SJeff Mahoney 137ba631941SJeff Mahoney features = get_features(fs_info, fa->feature_set); 138ba631941SJeff Mahoney 139ba631941SJeff Mahoney /* Nothing to do */ 140ba631941SJeff Mahoney if ((val && (features & fa->feature_bit)) || 141ba631941SJeff Mahoney (!val && !(features & fa->feature_bit))) 142ba631941SJeff Mahoney return count; 143ba631941SJeff Mahoney 144ba631941SJeff Mahoney if ((val && !(set & fa->feature_bit)) || 145ba631941SJeff Mahoney (!val && !(clear & fa->feature_bit))) { 146ba631941SJeff Mahoney btrfs_info(fs_info, 147ba631941SJeff Mahoney "%sabling feature %s on mounted fs is not supported.", 148ba631941SJeff Mahoney val ? "En" : "Dis", fa->kobj_attr.attr.name); 149ba631941SJeff Mahoney return -EPERM; 150ba631941SJeff Mahoney } 151ba631941SJeff Mahoney 152ba631941SJeff Mahoney btrfs_info(fs_info, "%s %s feature flag", 153ba631941SJeff Mahoney val ? "Setting" : "Clearing", fa->kobj_attr.attr.name); 154ba631941SJeff Mahoney 155ba631941SJeff Mahoney spin_lock(&fs_info->super_lock); 156ba631941SJeff Mahoney features = get_features(fs_info, fa->feature_set); 157ba631941SJeff Mahoney if (val) 158ba631941SJeff Mahoney features |= fa->feature_bit; 159ba631941SJeff Mahoney else 160ba631941SJeff Mahoney features &= ~fa->feature_bit; 161ba631941SJeff Mahoney set_features(fs_info, fa->feature_set, features); 162ba631941SJeff Mahoney spin_unlock(&fs_info->super_lock); 163ba631941SJeff Mahoney 1640eae2747SDavid Sterba /* 1650eae2747SDavid Sterba * We don't want to do full transaction commit from inside sysfs 1660eae2747SDavid Sterba */ 1670eae2747SDavid Sterba btrfs_set_pending(fs_info, COMMIT); 1680eae2747SDavid Sterba wake_up_process(fs_info->transaction_kthread); 169ba631941SJeff Mahoney 170ba631941SJeff Mahoney return count; 171ba631941SJeff Mahoney } 172ba631941SJeff Mahoney 173510d7360SJeff Mahoney static umode_t btrfs_feature_visible(struct kobject *kobj, 174510d7360SJeff Mahoney struct attribute *attr, int unused) 175510d7360SJeff Mahoney { 176510d7360SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj); 177510d7360SJeff Mahoney umode_t mode = attr->mode; 178510d7360SJeff Mahoney 179510d7360SJeff Mahoney if (fs_info) { 180510d7360SJeff Mahoney struct btrfs_feature_attr *fa; 181510d7360SJeff Mahoney u64 features; 182510d7360SJeff Mahoney 183510d7360SJeff Mahoney fa = attr_to_btrfs_feature_attr(attr); 184510d7360SJeff Mahoney features = get_features(fs_info, fa->feature_set); 185510d7360SJeff Mahoney 186ba631941SJeff Mahoney if (can_modify_feature(fa)) 187ba631941SJeff Mahoney mode |= S_IWUSR; 188ba631941SJeff Mahoney else if (!(features & fa->feature_bit)) 189510d7360SJeff Mahoney mode = 0; 190510d7360SJeff Mahoney } 191510d7360SJeff Mahoney 192510d7360SJeff Mahoney return mode; 193079b72bcSJeff Mahoney } 194079b72bcSJeff Mahoney 195079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(mixed_backref, MIXED_BACKREF); 196079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(default_subvol, DEFAULT_SUBVOL); 197079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(mixed_groups, MIXED_GROUPS); 198079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(compress_lzo, COMPRESS_LZO); 199079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(big_metadata, BIG_METADATA); 200079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(extended_iref, EXTENDED_IREF); 201079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(raid56, RAID56); 202079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(skinny_metadata, SKINNY_METADATA); 203c736c095SDavid Sterba BTRFS_FEAT_ATTR_INCOMPAT(no_holes, NO_HOLES); 204079b72bcSJeff Mahoney 205079b72bcSJeff Mahoney static struct attribute *btrfs_supported_feature_attrs[] = { 206079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(mixed_backref), 207079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(default_subvol), 208079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(mixed_groups), 209079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(compress_lzo), 210079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(big_metadata), 211079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(extended_iref), 212079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(raid56), 213079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(skinny_metadata), 214c736c095SDavid Sterba BTRFS_FEAT_ATTR_PTR(no_holes), 215079b72bcSJeff Mahoney NULL 216079b72bcSJeff Mahoney }; 217079b72bcSJeff Mahoney 218079b72bcSJeff Mahoney static const struct attribute_group btrfs_feature_attr_group = { 219079b72bcSJeff Mahoney .name = "features", 220510d7360SJeff Mahoney .is_visible = btrfs_feature_visible, 221079b72bcSJeff Mahoney .attrs = btrfs_supported_feature_attrs, 222079b72bcSJeff Mahoney }; 22358176a96SJosef Bacik 2246ab0a202SJeff Mahoney static ssize_t btrfs_show_u64(u64 *value_ptr, spinlock_t *lock, char *buf) 2256ab0a202SJeff Mahoney { 2266ab0a202SJeff Mahoney u64 val; 2276ab0a202SJeff Mahoney if (lock) 2286ab0a202SJeff Mahoney spin_lock(lock); 2296ab0a202SJeff Mahoney val = *value_ptr; 2306ab0a202SJeff Mahoney if (lock) 2316ab0a202SJeff Mahoney spin_unlock(lock); 2326ab0a202SJeff Mahoney return snprintf(buf, PAGE_SIZE, "%llu\n", val); 2336ab0a202SJeff Mahoney } 2346ab0a202SJeff Mahoney 2356ab0a202SJeff Mahoney static ssize_t global_rsv_size_show(struct kobject *kobj, 2366ab0a202SJeff Mahoney struct kobj_attribute *ka, char *buf) 2376ab0a202SJeff Mahoney { 2386ab0a202SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); 2396ab0a202SJeff Mahoney struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 2406ab0a202SJeff Mahoney return btrfs_show_u64(&block_rsv->size, &block_rsv->lock, buf); 2416ab0a202SJeff Mahoney } 24298b3d389SAnand Jain BTRFS_ATTR(global_rsv_size, global_rsv_size_show); 2436ab0a202SJeff Mahoney 2446ab0a202SJeff Mahoney static ssize_t global_rsv_reserved_show(struct kobject *kobj, 2456ab0a202SJeff Mahoney struct kobj_attribute *a, char *buf) 2466ab0a202SJeff Mahoney { 2476ab0a202SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); 2486ab0a202SJeff Mahoney struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 2496ab0a202SJeff Mahoney return btrfs_show_u64(&block_rsv->reserved, &block_rsv->lock, buf); 2506ab0a202SJeff Mahoney } 25198b3d389SAnand Jain BTRFS_ATTR(global_rsv_reserved, global_rsv_reserved_show); 2526ab0a202SJeff Mahoney 2536ab0a202SJeff Mahoney #define to_space_info(_kobj) container_of(_kobj, struct btrfs_space_info, kobj) 254c1895442SJeff Mahoney #define to_raid_kobj(_kobj) container_of(_kobj, struct raid_kobject, kobj) 2556ab0a202SJeff Mahoney 2566ab0a202SJeff Mahoney static ssize_t raid_bytes_show(struct kobject *kobj, 2576ab0a202SJeff Mahoney struct kobj_attribute *attr, char *buf); 2586ab0a202SJeff Mahoney BTRFS_RAID_ATTR(total_bytes, raid_bytes_show); 2596ab0a202SJeff Mahoney BTRFS_RAID_ATTR(used_bytes, raid_bytes_show); 2606ab0a202SJeff Mahoney 2616ab0a202SJeff Mahoney static ssize_t raid_bytes_show(struct kobject *kobj, 2626ab0a202SJeff Mahoney struct kobj_attribute *attr, char *buf) 2636ab0a202SJeff Mahoney 2646ab0a202SJeff Mahoney { 2656ab0a202SJeff Mahoney struct btrfs_space_info *sinfo = to_space_info(kobj->parent); 2666ab0a202SJeff Mahoney struct btrfs_block_group_cache *block_group; 267c1895442SJeff Mahoney int index = to_raid_kobj(kobj)->raid_type; 2686ab0a202SJeff Mahoney u64 val = 0; 2696ab0a202SJeff Mahoney 2706ab0a202SJeff Mahoney down_read(&sinfo->groups_sem); 2716ab0a202SJeff Mahoney list_for_each_entry(block_group, &sinfo->block_groups[index], list) { 2726ab0a202SJeff Mahoney if (&attr->attr == BTRFS_RAID_ATTR_PTR(total_bytes)) 2736ab0a202SJeff Mahoney val += block_group->key.offset; 2746ab0a202SJeff Mahoney else 2756ab0a202SJeff Mahoney val += btrfs_block_group_used(&block_group->item); 2766ab0a202SJeff Mahoney } 2776ab0a202SJeff Mahoney up_read(&sinfo->groups_sem); 2786ab0a202SJeff Mahoney return snprintf(buf, PAGE_SIZE, "%llu\n", val); 2796ab0a202SJeff Mahoney } 2806ab0a202SJeff Mahoney 2816ab0a202SJeff Mahoney static struct attribute *raid_attributes[] = { 2826ab0a202SJeff Mahoney BTRFS_RAID_ATTR_PTR(total_bytes), 2836ab0a202SJeff Mahoney BTRFS_RAID_ATTR_PTR(used_bytes), 2846ab0a202SJeff Mahoney NULL 2856ab0a202SJeff Mahoney }; 2866ab0a202SJeff Mahoney 2876ab0a202SJeff Mahoney static void release_raid_kobj(struct kobject *kobj) 2886ab0a202SJeff Mahoney { 289c1895442SJeff Mahoney kfree(to_raid_kobj(kobj)); 2906ab0a202SJeff Mahoney } 2916ab0a202SJeff Mahoney 2926ab0a202SJeff Mahoney struct kobj_type btrfs_raid_ktype = { 2936ab0a202SJeff Mahoney .sysfs_ops = &kobj_sysfs_ops, 2946ab0a202SJeff Mahoney .release = release_raid_kobj, 2956ab0a202SJeff Mahoney .default_attrs = raid_attributes, 2966ab0a202SJeff Mahoney }; 2976ab0a202SJeff Mahoney 2986ab0a202SJeff Mahoney #define SPACE_INFO_ATTR(field) \ 2996ab0a202SJeff Mahoney static ssize_t btrfs_space_info_show_##field(struct kobject *kobj, \ 3006ab0a202SJeff Mahoney struct kobj_attribute *a, \ 3016ab0a202SJeff Mahoney char *buf) \ 3026ab0a202SJeff Mahoney { \ 3036ab0a202SJeff Mahoney struct btrfs_space_info *sinfo = to_space_info(kobj); \ 3046ab0a202SJeff Mahoney return btrfs_show_u64(&sinfo->field, &sinfo->lock, buf); \ 3056ab0a202SJeff Mahoney } \ 30698b3d389SAnand Jain BTRFS_ATTR(field, btrfs_space_info_show_##field) 3076ab0a202SJeff Mahoney 3086ab0a202SJeff Mahoney static ssize_t btrfs_space_info_show_total_bytes_pinned(struct kobject *kobj, 3096ab0a202SJeff Mahoney struct kobj_attribute *a, 3106ab0a202SJeff Mahoney char *buf) 3116ab0a202SJeff Mahoney { 3126ab0a202SJeff Mahoney struct btrfs_space_info *sinfo = to_space_info(kobj); 3136ab0a202SJeff Mahoney s64 val = percpu_counter_sum(&sinfo->total_bytes_pinned); 3146ab0a202SJeff Mahoney return snprintf(buf, PAGE_SIZE, "%lld\n", val); 3156ab0a202SJeff Mahoney } 3166ab0a202SJeff Mahoney 3176ab0a202SJeff Mahoney SPACE_INFO_ATTR(flags); 3186ab0a202SJeff Mahoney SPACE_INFO_ATTR(total_bytes); 3196ab0a202SJeff Mahoney SPACE_INFO_ATTR(bytes_used); 3206ab0a202SJeff Mahoney SPACE_INFO_ATTR(bytes_pinned); 3216ab0a202SJeff Mahoney SPACE_INFO_ATTR(bytes_reserved); 3226ab0a202SJeff Mahoney SPACE_INFO_ATTR(bytes_may_use); 3236ab0a202SJeff Mahoney SPACE_INFO_ATTR(disk_used); 3246ab0a202SJeff Mahoney SPACE_INFO_ATTR(disk_total); 32598b3d389SAnand Jain BTRFS_ATTR(total_bytes_pinned, btrfs_space_info_show_total_bytes_pinned); 3266ab0a202SJeff Mahoney 3276ab0a202SJeff Mahoney static struct attribute *space_info_attrs[] = { 3286ab0a202SJeff Mahoney BTRFS_ATTR_PTR(flags), 3296ab0a202SJeff Mahoney BTRFS_ATTR_PTR(total_bytes), 3306ab0a202SJeff Mahoney BTRFS_ATTR_PTR(bytes_used), 3316ab0a202SJeff Mahoney BTRFS_ATTR_PTR(bytes_pinned), 3326ab0a202SJeff Mahoney BTRFS_ATTR_PTR(bytes_reserved), 3336ab0a202SJeff Mahoney BTRFS_ATTR_PTR(bytes_may_use), 3346ab0a202SJeff Mahoney BTRFS_ATTR_PTR(disk_used), 3356ab0a202SJeff Mahoney BTRFS_ATTR_PTR(disk_total), 3366ab0a202SJeff Mahoney BTRFS_ATTR_PTR(total_bytes_pinned), 3376ab0a202SJeff Mahoney NULL, 3386ab0a202SJeff Mahoney }; 3396ab0a202SJeff Mahoney 3406ab0a202SJeff Mahoney static void space_info_release(struct kobject *kobj) 3416ab0a202SJeff Mahoney { 3426ab0a202SJeff Mahoney struct btrfs_space_info *sinfo = to_space_info(kobj); 3436ab0a202SJeff Mahoney percpu_counter_destroy(&sinfo->total_bytes_pinned); 3446ab0a202SJeff Mahoney kfree(sinfo); 3456ab0a202SJeff Mahoney } 3466ab0a202SJeff Mahoney 3476ab0a202SJeff Mahoney struct kobj_type space_info_ktype = { 3486ab0a202SJeff Mahoney .sysfs_ops = &kobj_sysfs_ops, 3496ab0a202SJeff Mahoney .release = space_info_release, 3506ab0a202SJeff Mahoney .default_attrs = space_info_attrs, 3516ab0a202SJeff Mahoney }; 3526ab0a202SJeff Mahoney 3536ab0a202SJeff Mahoney static const struct attribute *allocation_attrs[] = { 3546ab0a202SJeff Mahoney BTRFS_ATTR_PTR(global_rsv_reserved), 3556ab0a202SJeff Mahoney BTRFS_ATTR_PTR(global_rsv_size), 3566ab0a202SJeff Mahoney NULL, 3576ab0a202SJeff Mahoney }; 3586ab0a202SJeff Mahoney 359f8ba9c11SJeff Mahoney static ssize_t btrfs_label_show(struct kobject *kobj, 360f8ba9c11SJeff Mahoney struct kobj_attribute *a, char *buf) 361f8ba9c11SJeff Mahoney { 362f8ba9c11SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj); 36348fcc3ffSSatoru Takeuchi char *label = fs_info->super_copy->label; 36448fcc3ffSSatoru Takeuchi return snprintf(buf, PAGE_SIZE, label[0] ? "%s\n" : "%s", label); 365f8ba9c11SJeff Mahoney } 366f8ba9c11SJeff Mahoney 367f8ba9c11SJeff Mahoney static ssize_t btrfs_label_store(struct kobject *kobj, 368f8ba9c11SJeff Mahoney struct kobj_attribute *a, 369f8ba9c11SJeff Mahoney const char *buf, size_t len) 370f8ba9c11SJeff Mahoney { 371f8ba9c11SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj); 37248fcc3ffSSatoru Takeuchi size_t p_len; 373f8ba9c11SJeff Mahoney 37479aec2b8SAnand Jain if (fs_info->sb->s_flags & MS_RDONLY) 37579aec2b8SAnand Jain return -EROFS; 37679aec2b8SAnand Jain 37748fcc3ffSSatoru Takeuchi /* 37848fcc3ffSSatoru Takeuchi * p_len is the len until the first occurrence of either 37948fcc3ffSSatoru Takeuchi * '\n' or '\0' 38048fcc3ffSSatoru Takeuchi */ 38148fcc3ffSSatoru Takeuchi p_len = strcspn(buf, "\n"); 38248fcc3ffSSatoru Takeuchi 38348fcc3ffSSatoru Takeuchi if (p_len >= BTRFS_LABEL_SIZE) 384f8ba9c11SJeff Mahoney return -EINVAL; 385f8ba9c11SJeff Mahoney 386a6f69dc8SDavid Sterba spin_lock(&fs_info->super_lock); 38748fcc3ffSSatoru Takeuchi memset(fs_info->super_copy->label, 0, BTRFS_LABEL_SIZE); 38848fcc3ffSSatoru Takeuchi memcpy(fs_info->super_copy->label, buf, p_len); 389a6f69dc8SDavid Sterba spin_unlock(&fs_info->super_lock); 390f8ba9c11SJeff Mahoney 391a6f69dc8SDavid Sterba /* 392a6f69dc8SDavid Sterba * We don't want to do full transaction commit from inside sysfs 393a6f69dc8SDavid Sterba */ 394a6f69dc8SDavid Sterba btrfs_set_pending(fs_info, COMMIT); 395a6f69dc8SDavid Sterba wake_up_process(fs_info->transaction_kthread); 396a6f69dc8SDavid Sterba 397f8ba9c11SJeff Mahoney return len; 398f8ba9c11SJeff Mahoney } 39920ee0825SAnand Jain BTRFS_ATTR_RW(label, btrfs_label_show, btrfs_label_store); 400f8ba9c11SJeff Mahoney 401df93589aSDavid Sterba static ssize_t btrfs_nodesize_show(struct kobject *kobj, 402df93589aSDavid Sterba struct kobj_attribute *a, char *buf) 403df93589aSDavid Sterba { 404df93589aSDavid Sterba struct btrfs_fs_info *fs_info = to_fs_info(kobj); 405df93589aSDavid Sterba 406df93589aSDavid Sterba return snprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->nodesize); 407df93589aSDavid Sterba } 408df93589aSDavid Sterba 40998b3d389SAnand Jain BTRFS_ATTR(nodesize, btrfs_nodesize_show); 410df93589aSDavid Sterba 411df93589aSDavid Sterba static ssize_t btrfs_sectorsize_show(struct kobject *kobj, 412df93589aSDavid Sterba struct kobj_attribute *a, char *buf) 413df93589aSDavid Sterba { 414df93589aSDavid Sterba struct btrfs_fs_info *fs_info = to_fs_info(kobj); 415df93589aSDavid Sterba 416df93589aSDavid Sterba return snprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->sectorsize); 417df93589aSDavid Sterba } 418df93589aSDavid Sterba 41998b3d389SAnand Jain BTRFS_ATTR(sectorsize, btrfs_sectorsize_show); 420df93589aSDavid Sterba 421df93589aSDavid Sterba static ssize_t btrfs_clone_alignment_show(struct kobject *kobj, 422df93589aSDavid Sterba struct kobj_attribute *a, char *buf) 423df93589aSDavid Sterba { 424df93589aSDavid Sterba struct btrfs_fs_info *fs_info = to_fs_info(kobj); 425df93589aSDavid Sterba 426df93589aSDavid Sterba return snprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->sectorsize); 427df93589aSDavid Sterba } 428df93589aSDavid Sterba 42998b3d389SAnand Jain BTRFS_ATTR(clone_alignment, btrfs_clone_alignment_show); 430df93589aSDavid Sterba 431f8ba9c11SJeff Mahoney static struct attribute *btrfs_attrs[] = { 432f8ba9c11SJeff Mahoney BTRFS_ATTR_PTR(label), 433df93589aSDavid Sterba BTRFS_ATTR_PTR(nodesize), 434df93589aSDavid Sterba BTRFS_ATTR_PTR(sectorsize), 435df93589aSDavid Sterba BTRFS_ATTR_PTR(clone_alignment), 436f8ba9c11SJeff Mahoney NULL, 437f8ba9c11SJeff Mahoney }; 438f8ba9c11SJeff Mahoney 439510d7360SJeff Mahoney static void btrfs_release_super_kobj(struct kobject *kobj) 440510d7360SJeff Mahoney { 441510d7360SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj); 442510d7360SJeff Mahoney complete(&fs_info->kobj_unregister); 443510d7360SJeff Mahoney } 444510d7360SJeff Mahoney 445510d7360SJeff Mahoney static struct kobj_type btrfs_ktype = { 446510d7360SJeff Mahoney .sysfs_ops = &kobj_sysfs_ops, 447510d7360SJeff Mahoney .release = btrfs_release_super_kobj, 448f8ba9c11SJeff Mahoney .default_attrs = btrfs_attrs, 449510d7360SJeff Mahoney }; 450510d7360SJeff Mahoney 451510d7360SJeff Mahoney static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj) 452510d7360SJeff Mahoney { 453510d7360SJeff Mahoney if (kobj->ktype != &btrfs_ktype) 454510d7360SJeff Mahoney return NULL; 455510d7360SJeff Mahoney return container_of(kobj, struct btrfs_fs_info, super_kobj); 456510d7360SJeff Mahoney } 45758176a96SJosef Bacik 458e453d989SJeff Mahoney #define NUM_FEATURE_BITS 64 459e453d989SJeff Mahoney static char btrfs_unknown_feature_names[3][NUM_FEATURE_BITS][13]; 460e453d989SJeff Mahoney static struct btrfs_feature_attr btrfs_feature_attrs[3][NUM_FEATURE_BITS]; 461e453d989SJeff Mahoney 462e453d989SJeff Mahoney static u64 supported_feature_masks[3] = { 463e453d989SJeff Mahoney [FEAT_COMPAT] = BTRFS_FEATURE_COMPAT_SUPP, 464e453d989SJeff Mahoney [FEAT_COMPAT_RO] = BTRFS_FEATURE_COMPAT_RO_SUPP, 465e453d989SJeff Mahoney [FEAT_INCOMPAT] = BTRFS_FEATURE_INCOMPAT_SUPP, 466e453d989SJeff Mahoney }; 467e453d989SJeff Mahoney 468e453d989SJeff Mahoney static int addrm_unknown_feature_attrs(struct btrfs_fs_info *fs_info, bool add) 4695ac1d209SJeff Mahoney { 470e453d989SJeff Mahoney int set; 471e453d989SJeff Mahoney 472e453d989SJeff Mahoney for (set = 0; set < FEAT_MAX; set++) { 473e453d989SJeff Mahoney int i; 474e453d989SJeff Mahoney struct attribute *attrs[2]; 475e453d989SJeff Mahoney struct attribute_group agroup = { 476e453d989SJeff Mahoney .name = "features", 477e453d989SJeff Mahoney .attrs = attrs, 478e453d989SJeff Mahoney }; 479e453d989SJeff Mahoney u64 features = get_features(fs_info, set); 480e453d989SJeff Mahoney features &= ~supported_feature_masks[set]; 481e453d989SJeff Mahoney 482e453d989SJeff Mahoney if (!features) 483e453d989SJeff Mahoney continue; 484e453d989SJeff Mahoney 485e453d989SJeff Mahoney attrs[1] = NULL; 486e453d989SJeff Mahoney for (i = 0; i < NUM_FEATURE_BITS; i++) { 487e453d989SJeff Mahoney struct btrfs_feature_attr *fa; 488e453d989SJeff Mahoney 489e453d989SJeff Mahoney if (!(features & (1ULL << i))) 490e453d989SJeff Mahoney continue; 491e453d989SJeff Mahoney 492e453d989SJeff Mahoney fa = &btrfs_feature_attrs[set][i]; 493e453d989SJeff Mahoney attrs[0] = &fa->kobj_attr.attr; 494e453d989SJeff Mahoney if (add) { 495e453d989SJeff Mahoney int ret; 496e453d989SJeff Mahoney ret = sysfs_merge_group(&fs_info->super_kobj, 497e453d989SJeff Mahoney &agroup); 498e453d989SJeff Mahoney if (ret) 499e453d989SJeff Mahoney return ret; 500e453d989SJeff Mahoney } else 501e453d989SJeff Mahoney sysfs_unmerge_group(&fs_info->super_kobj, 502e453d989SJeff Mahoney &agroup); 503e453d989SJeff Mahoney } 504e453d989SJeff Mahoney 505e453d989SJeff Mahoney } 506e453d989SJeff Mahoney return 0; 507e453d989SJeff Mahoney } 508e453d989SJeff Mahoney 509e453d989SJeff Mahoney static void __btrfs_sysfs_remove_one(struct btrfs_fs_info *fs_info) 510e453d989SJeff Mahoney { 5115ac1d209SJeff Mahoney kobject_del(&fs_info->super_kobj); 5125ac1d209SJeff Mahoney kobject_put(&fs_info->super_kobj); 5135ac1d209SJeff Mahoney wait_for_completion(&fs_info->kobj_unregister); 5145ac1d209SJeff Mahoney } 5155ac1d209SJeff Mahoney 516e453d989SJeff Mahoney void btrfs_sysfs_remove_one(struct btrfs_fs_info *fs_info) 517e453d989SJeff Mahoney { 518e453d989SJeff Mahoney if (fs_info->space_info_kobj) { 519e453d989SJeff Mahoney sysfs_remove_files(fs_info->space_info_kobj, allocation_attrs); 520e453d989SJeff Mahoney kobject_del(fs_info->space_info_kobj); 521e453d989SJeff Mahoney kobject_put(fs_info->space_info_kobj); 522e453d989SJeff Mahoney } 523e453d989SJeff Mahoney kobject_del(fs_info->device_dir_kobj); 524e453d989SJeff Mahoney kobject_put(fs_info->device_dir_kobj); 525e453d989SJeff Mahoney addrm_unknown_feature_attrs(fs_info, false); 526e453d989SJeff Mahoney sysfs_remove_group(&fs_info->super_kobj, &btrfs_feature_attr_group); 527e453d989SJeff Mahoney __btrfs_sysfs_remove_one(fs_info); 528e453d989SJeff Mahoney } 529e453d989SJeff Mahoney 53079da4fa4SJeff Mahoney const char * const btrfs_feature_set_names[3] = { 53179da4fa4SJeff Mahoney [FEAT_COMPAT] = "compat", 53279da4fa4SJeff Mahoney [FEAT_COMPAT_RO] = "compat_ro", 53379da4fa4SJeff Mahoney [FEAT_INCOMPAT] = "incompat", 53479da4fa4SJeff Mahoney }; 53579da4fa4SJeff Mahoney 5363b02a68aSJeff Mahoney char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags) 5373b02a68aSJeff Mahoney { 5383b02a68aSJeff Mahoney size_t bufsize = 4096; /* safe max, 64 names * 64 bytes */ 5393b02a68aSJeff Mahoney int len = 0; 5403b02a68aSJeff Mahoney int i; 5413b02a68aSJeff Mahoney char *str; 5423b02a68aSJeff Mahoney 5433b02a68aSJeff Mahoney str = kmalloc(bufsize, GFP_KERNEL); 5443b02a68aSJeff Mahoney if (!str) 5453b02a68aSJeff Mahoney return str; 5463b02a68aSJeff Mahoney 5473b02a68aSJeff Mahoney for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { 5483b02a68aSJeff Mahoney const char *name; 5493b02a68aSJeff Mahoney 5503b02a68aSJeff Mahoney if (!(flags & (1ULL << i))) 5513b02a68aSJeff Mahoney continue; 5523b02a68aSJeff Mahoney 5533b02a68aSJeff Mahoney name = btrfs_feature_attrs[set][i].kobj_attr.attr.name; 5543b02a68aSJeff Mahoney len += snprintf(str + len, bufsize - len, "%s%s", 5553b02a68aSJeff Mahoney len ? "," : "", name); 5563b02a68aSJeff Mahoney } 5573b02a68aSJeff Mahoney 5583b02a68aSJeff Mahoney return str; 5593b02a68aSJeff Mahoney } 5603b02a68aSJeff Mahoney 56179da4fa4SJeff Mahoney static void init_feature_attrs(void) 56279da4fa4SJeff Mahoney { 56379da4fa4SJeff Mahoney struct btrfs_feature_attr *fa; 56479da4fa4SJeff Mahoney int set, i; 56579da4fa4SJeff Mahoney 56679da4fa4SJeff Mahoney BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names) != 56779da4fa4SJeff Mahoney ARRAY_SIZE(btrfs_feature_attrs)); 56879da4fa4SJeff Mahoney BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names[0]) != 56979da4fa4SJeff Mahoney ARRAY_SIZE(btrfs_feature_attrs[0])); 57079da4fa4SJeff Mahoney 5713b02a68aSJeff Mahoney memset(btrfs_feature_attrs, 0, sizeof(btrfs_feature_attrs)); 5723b02a68aSJeff Mahoney memset(btrfs_unknown_feature_names, 0, 5733b02a68aSJeff Mahoney sizeof(btrfs_unknown_feature_names)); 5743b02a68aSJeff Mahoney 57579da4fa4SJeff Mahoney for (i = 0; btrfs_supported_feature_attrs[i]; i++) { 57679da4fa4SJeff Mahoney struct btrfs_feature_attr *sfa; 57779da4fa4SJeff Mahoney struct attribute *a = btrfs_supported_feature_attrs[i]; 5783b02a68aSJeff Mahoney int bit; 57979da4fa4SJeff Mahoney sfa = attr_to_btrfs_feature_attr(a); 5803b02a68aSJeff Mahoney bit = ilog2(sfa->feature_bit); 5813b02a68aSJeff Mahoney fa = &btrfs_feature_attrs[sfa->feature_set][bit]; 58279da4fa4SJeff Mahoney 58379da4fa4SJeff Mahoney fa->kobj_attr.attr.name = sfa->kobj_attr.attr.name; 58479da4fa4SJeff Mahoney } 58579da4fa4SJeff Mahoney 58679da4fa4SJeff Mahoney for (set = 0; set < FEAT_MAX; set++) { 58779da4fa4SJeff Mahoney for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { 58879da4fa4SJeff Mahoney char *name = btrfs_unknown_feature_names[set][i]; 58979da4fa4SJeff Mahoney fa = &btrfs_feature_attrs[set][i]; 59079da4fa4SJeff Mahoney 59179da4fa4SJeff Mahoney if (fa->kobj_attr.attr.name) 59279da4fa4SJeff Mahoney continue; 59379da4fa4SJeff Mahoney 59479da4fa4SJeff Mahoney snprintf(name, 13, "%s:%u", 59579da4fa4SJeff Mahoney btrfs_feature_set_names[set], i); 59679da4fa4SJeff Mahoney 59779da4fa4SJeff Mahoney fa->kobj_attr.attr.name = name; 59879da4fa4SJeff Mahoney fa->kobj_attr.attr.mode = S_IRUGO; 59979da4fa4SJeff Mahoney fa->feature_set = set; 60079da4fa4SJeff Mahoney fa->feature_bit = 1ULL << i; 60179da4fa4SJeff Mahoney } 60279da4fa4SJeff Mahoney } 60379da4fa4SJeff Mahoney } 60479da4fa4SJeff Mahoney 60599994cdeSAnand Jain int btrfs_kobj_rm_device(struct btrfs_fs_info *fs_info, 60699994cdeSAnand Jain struct btrfs_device *one_device) 60799994cdeSAnand Jain { 60899994cdeSAnand Jain struct hd_struct *disk; 60999994cdeSAnand Jain struct kobject *disk_kobj; 61099994cdeSAnand Jain 61199994cdeSAnand Jain if (!fs_info->device_dir_kobj) 61299994cdeSAnand Jain return -EINVAL; 61399994cdeSAnand Jain 61487fa3bb0SLiu Bo if (one_device && one_device->bdev) { 61599994cdeSAnand Jain disk = one_device->bdev->bd_part; 61699994cdeSAnand Jain disk_kobj = &part_to_dev(disk)->kobj; 61799994cdeSAnand Jain 61899994cdeSAnand Jain sysfs_remove_link(fs_info->device_dir_kobj, 61999994cdeSAnand Jain disk_kobj->name); 62099994cdeSAnand Jain } 62199994cdeSAnand Jain 62299994cdeSAnand Jain return 0; 62399994cdeSAnand Jain } 62499994cdeSAnand Jain 6250d39376aSAnand Jain int btrfs_kobj_add_device(struct btrfs_fs_info *fs_info, 6260d39376aSAnand Jain struct btrfs_device *one_device) 62729e5be24SJeff Mahoney { 62829e5be24SJeff Mahoney int error = 0; 62929e5be24SJeff Mahoney struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; 63029e5be24SJeff Mahoney struct btrfs_device *dev; 63129e5be24SJeff Mahoney 6320d39376aSAnand Jain if (!fs_info->device_dir_kobj) 63329e5be24SJeff Mahoney fs_info->device_dir_kobj = kobject_create_and_add("devices", 63429e5be24SJeff Mahoney &fs_info->super_kobj); 6350d39376aSAnand Jain 63629e5be24SJeff Mahoney if (!fs_info->device_dir_kobj) 63729e5be24SJeff Mahoney return -ENOMEM; 63829e5be24SJeff Mahoney 63929e5be24SJeff Mahoney list_for_each_entry(dev, &fs_devices->devices, dev_list) { 640f085381eSAnand Jain struct hd_struct *disk; 641f085381eSAnand Jain struct kobject *disk_kobj; 642f085381eSAnand Jain 643f085381eSAnand Jain if (!dev->bdev) 644f085381eSAnand Jain continue; 645f085381eSAnand Jain 6460d39376aSAnand Jain if (one_device && one_device != dev) 6470d39376aSAnand Jain continue; 6480d39376aSAnand Jain 649f085381eSAnand Jain disk = dev->bdev->bd_part; 650f085381eSAnand Jain disk_kobj = &part_to_dev(disk)->kobj; 65129e5be24SJeff Mahoney 65229e5be24SJeff Mahoney error = sysfs_create_link(fs_info->device_dir_kobj, 65329e5be24SJeff Mahoney disk_kobj, disk_kobj->name); 65429e5be24SJeff Mahoney if (error) 65529e5be24SJeff Mahoney break; 65629e5be24SJeff Mahoney } 65729e5be24SJeff Mahoney 65829e5be24SJeff Mahoney return error; 65929e5be24SJeff Mahoney } 66029e5be24SJeff Mahoney 661510d7360SJeff Mahoney /* /sys/fs/btrfs/ entry */ 662510d7360SJeff Mahoney static struct kset *btrfs_kset; 663510d7360SJeff Mahoney 6641bae3098SDavid Sterba /* /sys/kernel/debug/btrfs */ 6651bae3098SDavid Sterba static struct dentry *btrfs_debugfs_root_dentry; 6661bae3098SDavid Sterba 6671bae3098SDavid Sterba /* Debugging tunables and exported data */ 6681bae3098SDavid Sterba u64 btrfs_debugfs_test; 6691bae3098SDavid Sterba 6705ac1d209SJeff Mahoney int btrfs_sysfs_add_one(struct btrfs_fs_info *fs_info) 6715ac1d209SJeff Mahoney { 6725ac1d209SJeff Mahoney int error; 6735ac1d209SJeff Mahoney 6745ac1d209SJeff Mahoney init_completion(&fs_info->kobj_unregister); 675510d7360SJeff Mahoney fs_info->super_kobj.kset = btrfs_kset; 6765ac1d209SJeff Mahoney error = kobject_init_and_add(&fs_info->super_kobj, &btrfs_ktype, NULL, 6775ac1d209SJeff Mahoney "%pU", fs_info->fsid); 678e453d989SJeff Mahoney if (error) 679e453d989SJeff Mahoney return error; 680510d7360SJeff Mahoney 681510d7360SJeff Mahoney error = sysfs_create_group(&fs_info->super_kobj, 682510d7360SJeff Mahoney &btrfs_feature_attr_group); 683e453d989SJeff Mahoney if (error) { 684e453d989SJeff Mahoney __btrfs_sysfs_remove_one(fs_info); 685e453d989SJeff Mahoney return error; 686e453d989SJeff Mahoney } 68779da4fa4SJeff Mahoney 688e453d989SJeff Mahoney error = addrm_unknown_feature_attrs(fs_info, true); 68979da4fa4SJeff Mahoney if (error) 69079da4fa4SJeff Mahoney goto failure; 69179da4fa4SJeff Mahoney 6920d39376aSAnand Jain error = btrfs_kobj_add_device(fs_info, NULL); 69329e5be24SJeff Mahoney if (error) 69429e5be24SJeff Mahoney goto failure; 69529e5be24SJeff Mahoney 6966ab0a202SJeff Mahoney fs_info->space_info_kobj = kobject_create_and_add("allocation", 6976ab0a202SJeff Mahoney &fs_info->super_kobj); 6986ab0a202SJeff Mahoney if (!fs_info->space_info_kobj) { 6996ab0a202SJeff Mahoney error = -ENOMEM; 7006ab0a202SJeff Mahoney goto failure; 7016ab0a202SJeff Mahoney } 7026ab0a202SJeff Mahoney 7036ab0a202SJeff Mahoney error = sysfs_create_files(fs_info->space_info_kobj, allocation_attrs); 7046ab0a202SJeff Mahoney if (error) 7056ab0a202SJeff Mahoney goto failure; 7066ab0a202SJeff Mahoney 70779da4fa4SJeff Mahoney return 0; 70879da4fa4SJeff Mahoney failure: 709510d7360SJeff Mahoney btrfs_sysfs_remove_one(fs_info); 7105ac1d209SJeff Mahoney return error; 7115ac1d209SJeff Mahoney } 7125ac1d209SJeff Mahoney 7131bae3098SDavid Sterba static int btrfs_init_debugfs(void) 7141bae3098SDavid Sterba { 7151bae3098SDavid Sterba #ifdef CONFIG_DEBUG_FS 7161bae3098SDavid Sterba btrfs_debugfs_root_dentry = debugfs_create_dir("btrfs", NULL); 7171bae3098SDavid Sterba if (!btrfs_debugfs_root_dentry) 7181bae3098SDavid Sterba return -ENOMEM; 7191bae3098SDavid Sterba 7201bae3098SDavid Sterba debugfs_create_u64("test", S_IRUGO | S_IWUGO, btrfs_debugfs_root_dentry, 7211bae3098SDavid Sterba &btrfs_debugfs_test); 7221bae3098SDavid Sterba #endif 7231bae3098SDavid Sterba return 0; 7241bae3098SDavid Sterba } 7251bae3098SDavid Sterba 726b214107eSChristoph Hellwig int btrfs_init_sysfs(void) 72758176a96SJosef Bacik { 728079b72bcSJeff Mahoney int ret; 7291bae3098SDavid Sterba 730e3fe4e71SGreg KH btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj); 731e3fe4e71SGreg KH if (!btrfs_kset) 732e3fe4e71SGreg KH return -ENOMEM; 733079b72bcSJeff Mahoney 7341bae3098SDavid Sterba ret = btrfs_init_debugfs(); 7351bae3098SDavid Sterba if (ret) 736001a648dSFilipe Manana goto out1; 737079b72bcSJeff Mahoney 7381bae3098SDavid Sterba init_feature_attrs(); 7391bae3098SDavid Sterba ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); 740001a648dSFilipe Manana if (ret) 741001a648dSFilipe Manana goto out2; 742001a648dSFilipe Manana 743001a648dSFilipe Manana return 0; 744001a648dSFilipe Manana out2: 745001a648dSFilipe Manana debugfs_remove_recursive(btrfs_debugfs_root_dentry); 746001a648dSFilipe Manana out1: 747001a648dSFilipe Manana kset_unregister(btrfs_kset); 7481bae3098SDavid Sterba 7491bae3098SDavid Sterba return ret; 75058176a96SJosef Bacik } 75158176a96SJosef Bacik 752b214107eSChristoph Hellwig void btrfs_exit_sysfs(void) 75358176a96SJosef Bacik { 754079b72bcSJeff Mahoney sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); 755e3fe4e71SGreg KH kset_unregister(btrfs_kset); 7561bae3098SDavid Sterba debugfs_remove_recursive(btrfs_debugfs_root_dentry); 75758176a96SJosef Bacik } 75855d47414SChris Mason 759