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); 362e7910d6SAnand Jain static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj); 375ac1d209SJeff Mahoney 38510d7360SJeff Mahoney static u64 get_features(struct btrfs_fs_info *fs_info, 39510d7360SJeff Mahoney enum btrfs_feature_set set) 405ac1d209SJeff Mahoney { 41510d7360SJeff Mahoney struct btrfs_super_block *disk_super = fs_info->super_copy; 42510d7360SJeff Mahoney if (set == FEAT_COMPAT) 43510d7360SJeff Mahoney return btrfs_super_compat_flags(disk_super); 44510d7360SJeff Mahoney else if (set == FEAT_COMPAT_RO) 45510d7360SJeff Mahoney return btrfs_super_compat_ro_flags(disk_super); 46510d7360SJeff Mahoney else 47510d7360SJeff Mahoney return btrfs_super_incompat_flags(disk_super); 485ac1d209SJeff Mahoney } 495ac1d209SJeff Mahoney 50ba631941SJeff Mahoney static void set_features(struct btrfs_fs_info *fs_info, 51ba631941SJeff Mahoney enum btrfs_feature_set set, u64 features) 52ba631941SJeff Mahoney { 53ba631941SJeff Mahoney struct btrfs_super_block *disk_super = fs_info->super_copy; 54ba631941SJeff Mahoney if (set == FEAT_COMPAT) 55ba631941SJeff Mahoney btrfs_set_super_compat_flags(disk_super, features); 56ba631941SJeff Mahoney else if (set == FEAT_COMPAT_RO) 57ba631941SJeff Mahoney btrfs_set_super_compat_ro_flags(disk_super, features); 58ba631941SJeff Mahoney else 59ba631941SJeff Mahoney btrfs_set_super_incompat_flags(disk_super, features); 60ba631941SJeff Mahoney } 61ba631941SJeff Mahoney 62ba631941SJeff Mahoney static int can_modify_feature(struct btrfs_feature_attr *fa) 63ba631941SJeff Mahoney { 64ba631941SJeff Mahoney int val = 0; 65ba631941SJeff Mahoney u64 set, clear; 66ba631941SJeff Mahoney switch (fa->feature_set) { 67ba631941SJeff Mahoney case FEAT_COMPAT: 68ba631941SJeff Mahoney set = BTRFS_FEATURE_COMPAT_SAFE_SET; 69ba631941SJeff Mahoney clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR; 70ba631941SJeff Mahoney break; 71ba631941SJeff Mahoney case FEAT_COMPAT_RO: 72ba631941SJeff Mahoney set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET; 73ba631941SJeff Mahoney clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR; 74ba631941SJeff Mahoney break; 75ba631941SJeff Mahoney case FEAT_INCOMPAT: 76ba631941SJeff Mahoney set = BTRFS_FEATURE_INCOMPAT_SAFE_SET; 77ba631941SJeff Mahoney clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR; 78ba631941SJeff Mahoney break; 79ba631941SJeff Mahoney default: 8062e85577SJeff Mahoney pr_warn("btrfs: sysfs: unknown feature set %d\n", 81cc37bb04SDavid Sterba fa->feature_set); 82cc37bb04SDavid Sterba return 0; 83ba631941SJeff Mahoney } 84ba631941SJeff Mahoney 85ba631941SJeff Mahoney if (set & fa->feature_bit) 86ba631941SJeff Mahoney val |= 1; 87ba631941SJeff Mahoney if (clear & fa->feature_bit) 88ba631941SJeff Mahoney val |= 2; 89ba631941SJeff Mahoney 90ba631941SJeff Mahoney return val; 91ba631941SJeff Mahoney } 92ba631941SJeff Mahoney 93079b72bcSJeff Mahoney static ssize_t btrfs_feature_attr_show(struct kobject *kobj, 94079b72bcSJeff Mahoney struct kobj_attribute *a, char *buf) 95079b72bcSJeff Mahoney { 96510d7360SJeff Mahoney int val = 0; 97510d7360SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj); 98510d7360SJeff Mahoney struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a); 99ba631941SJeff Mahoney if (fs_info) { 100510d7360SJeff Mahoney u64 features = get_features(fs_info, fa->feature_set); 101510d7360SJeff Mahoney if (features & fa->feature_bit) 102510d7360SJeff Mahoney val = 1; 103ba631941SJeff Mahoney } else 104ba631941SJeff Mahoney val = can_modify_feature(fa); 105510d7360SJeff Mahoney 106510d7360SJeff Mahoney return snprintf(buf, PAGE_SIZE, "%d\n", val); 107510d7360SJeff Mahoney } 108510d7360SJeff Mahoney 109ba631941SJeff Mahoney static ssize_t btrfs_feature_attr_store(struct kobject *kobj, 110ba631941SJeff Mahoney struct kobj_attribute *a, 111ba631941SJeff Mahoney const char *buf, size_t count) 112ba631941SJeff Mahoney { 113ba631941SJeff Mahoney struct btrfs_fs_info *fs_info; 114ba631941SJeff Mahoney struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a); 115ba631941SJeff Mahoney u64 features, set, clear; 116ba631941SJeff Mahoney unsigned long val; 117ba631941SJeff Mahoney int ret; 118ba631941SJeff Mahoney 119ba631941SJeff Mahoney fs_info = to_fs_info(kobj); 120ba631941SJeff Mahoney if (!fs_info) 121ba631941SJeff Mahoney return -EPERM; 122ba631941SJeff Mahoney 123ee611138SDavid Sterba if (fs_info->sb->s_flags & MS_RDONLY) 124ee611138SDavid Sterba return -EROFS; 125ee611138SDavid Sterba 126ba631941SJeff Mahoney ret = kstrtoul(skip_spaces(buf), 0, &val); 127ba631941SJeff Mahoney if (ret) 128ba631941SJeff Mahoney return ret; 129ba631941SJeff Mahoney 130ba631941SJeff Mahoney if (fa->feature_set == FEAT_COMPAT) { 131ba631941SJeff Mahoney set = BTRFS_FEATURE_COMPAT_SAFE_SET; 132ba631941SJeff Mahoney clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR; 133ba631941SJeff Mahoney } else if (fa->feature_set == FEAT_COMPAT_RO) { 134ba631941SJeff Mahoney set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET; 135ba631941SJeff Mahoney clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR; 136ba631941SJeff Mahoney } else { 137ba631941SJeff Mahoney set = BTRFS_FEATURE_INCOMPAT_SAFE_SET; 138ba631941SJeff Mahoney clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR; 139ba631941SJeff Mahoney } 140ba631941SJeff Mahoney 141ba631941SJeff Mahoney features = get_features(fs_info, fa->feature_set); 142ba631941SJeff Mahoney 143ba631941SJeff Mahoney /* Nothing to do */ 144ba631941SJeff Mahoney if ((val && (features & fa->feature_bit)) || 145ba631941SJeff Mahoney (!val && !(features & fa->feature_bit))) 146ba631941SJeff Mahoney return count; 147ba631941SJeff Mahoney 148ba631941SJeff Mahoney if ((val && !(set & fa->feature_bit)) || 149ba631941SJeff Mahoney (!val && !(clear & fa->feature_bit))) { 150ba631941SJeff Mahoney btrfs_info(fs_info, 151ba631941SJeff Mahoney "%sabling feature %s on mounted fs is not supported.", 152ba631941SJeff Mahoney val ? "En" : "Dis", fa->kobj_attr.attr.name); 153ba631941SJeff Mahoney return -EPERM; 154ba631941SJeff Mahoney } 155ba631941SJeff Mahoney 156ba631941SJeff Mahoney btrfs_info(fs_info, "%s %s feature flag", 157ba631941SJeff Mahoney val ? "Setting" : "Clearing", fa->kobj_attr.attr.name); 158ba631941SJeff Mahoney 159ba631941SJeff Mahoney spin_lock(&fs_info->super_lock); 160ba631941SJeff Mahoney features = get_features(fs_info, fa->feature_set); 161ba631941SJeff Mahoney if (val) 162ba631941SJeff Mahoney features |= fa->feature_bit; 163ba631941SJeff Mahoney else 164ba631941SJeff Mahoney features &= ~fa->feature_bit; 165ba631941SJeff Mahoney set_features(fs_info, fa->feature_set, features); 166ba631941SJeff Mahoney spin_unlock(&fs_info->super_lock); 167ba631941SJeff Mahoney 1680eae2747SDavid Sterba /* 1690eae2747SDavid Sterba * We don't want to do full transaction commit from inside sysfs 1700eae2747SDavid Sterba */ 1710eae2747SDavid Sterba btrfs_set_pending(fs_info, COMMIT); 1720eae2747SDavid Sterba wake_up_process(fs_info->transaction_kthread); 173ba631941SJeff Mahoney 174ba631941SJeff Mahoney return count; 175ba631941SJeff Mahoney } 176ba631941SJeff Mahoney 177510d7360SJeff Mahoney static umode_t btrfs_feature_visible(struct kobject *kobj, 178510d7360SJeff Mahoney struct attribute *attr, int unused) 179510d7360SJeff Mahoney { 180510d7360SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj); 181510d7360SJeff Mahoney umode_t mode = attr->mode; 182510d7360SJeff Mahoney 183510d7360SJeff Mahoney if (fs_info) { 184510d7360SJeff Mahoney struct btrfs_feature_attr *fa; 185510d7360SJeff Mahoney u64 features; 186510d7360SJeff Mahoney 187510d7360SJeff Mahoney fa = attr_to_btrfs_feature_attr(attr); 188510d7360SJeff Mahoney features = get_features(fs_info, fa->feature_set); 189510d7360SJeff Mahoney 190ba631941SJeff Mahoney if (can_modify_feature(fa)) 191ba631941SJeff Mahoney mode |= S_IWUSR; 192ba631941SJeff Mahoney else if (!(features & fa->feature_bit)) 193510d7360SJeff Mahoney mode = 0; 194510d7360SJeff Mahoney } 195510d7360SJeff Mahoney 196510d7360SJeff Mahoney return mode; 197079b72bcSJeff Mahoney } 198079b72bcSJeff Mahoney 199079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(mixed_backref, MIXED_BACKREF); 200079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(default_subvol, DEFAULT_SUBVOL); 201079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(mixed_groups, MIXED_GROUPS); 202079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(compress_lzo, COMPRESS_LZO); 203079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(big_metadata, BIG_METADATA); 204079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(extended_iref, EXTENDED_IREF); 205079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(raid56, RAID56); 206079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(skinny_metadata, SKINNY_METADATA); 207c736c095SDavid Sterba BTRFS_FEAT_ATTR_INCOMPAT(no_holes, NO_HOLES); 2083b5bb73bSDavid Sterba BTRFS_FEAT_ATTR_COMPAT_RO(free_space_tree, FREE_SPACE_TREE); 209079b72bcSJeff Mahoney 210079b72bcSJeff Mahoney static struct attribute *btrfs_supported_feature_attrs[] = { 211079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(mixed_backref), 212079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(default_subvol), 213079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(mixed_groups), 214079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(compress_lzo), 215079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(big_metadata), 216079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(extended_iref), 217079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(raid56), 218079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(skinny_metadata), 219c736c095SDavid Sterba BTRFS_FEAT_ATTR_PTR(no_holes), 2203b5bb73bSDavid Sterba BTRFS_FEAT_ATTR_PTR(free_space_tree), 221079b72bcSJeff Mahoney NULL 222079b72bcSJeff Mahoney }; 223079b72bcSJeff Mahoney 224079b72bcSJeff Mahoney static const struct attribute_group btrfs_feature_attr_group = { 225079b72bcSJeff Mahoney .name = "features", 226510d7360SJeff Mahoney .is_visible = btrfs_feature_visible, 227079b72bcSJeff Mahoney .attrs = btrfs_supported_feature_attrs, 228079b72bcSJeff Mahoney }; 22958176a96SJosef Bacik 2306ab0a202SJeff Mahoney static ssize_t btrfs_show_u64(u64 *value_ptr, spinlock_t *lock, char *buf) 2316ab0a202SJeff Mahoney { 2326ab0a202SJeff Mahoney u64 val; 2336ab0a202SJeff Mahoney if (lock) 2346ab0a202SJeff Mahoney spin_lock(lock); 2356ab0a202SJeff Mahoney val = *value_ptr; 2366ab0a202SJeff Mahoney if (lock) 2376ab0a202SJeff Mahoney spin_unlock(lock); 2386ab0a202SJeff Mahoney return snprintf(buf, PAGE_SIZE, "%llu\n", val); 2396ab0a202SJeff Mahoney } 2406ab0a202SJeff Mahoney 2416ab0a202SJeff Mahoney static ssize_t global_rsv_size_show(struct kobject *kobj, 2426ab0a202SJeff Mahoney struct kobj_attribute *ka, char *buf) 2436ab0a202SJeff Mahoney { 2446ab0a202SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); 2456ab0a202SJeff Mahoney struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 2466ab0a202SJeff Mahoney return btrfs_show_u64(&block_rsv->size, &block_rsv->lock, buf); 2476ab0a202SJeff Mahoney } 24898b3d389SAnand Jain BTRFS_ATTR(global_rsv_size, global_rsv_size_show); 2496ab0a202SJeff Mahoney 2506ab0a202SJeff Mahoney static ssize_t global_rsv_reserved_show(struct kobject *kobj, 2516ab0a202SJeff Mahoney struct kobj_attribute *a, char *buf) 2526ab0a202SJeff Mahoney { 2536ab0a202SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); 2546ab0a202SJeff Mahoney struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 2556ab0a202SJeff Mahoney return btrfs_show_u64(&block_rsv->reserved, &block_rsv->lock, buf); 2566ab0a202SJeff Mahoney } 25798b3d389SAnand Jain BTRFS_ATTR(global_rsv_reserved, global_rsv_reserved_show); 2586ab0a202SJeff Mahoney 2596ab0a202SJeff Mahoney #define to_space_info(_kobj) container_of(_kobj, struct btrfs_space_info, kobj) 260c1895442SJeff Mahoney #define to_raid_kobj(_kobj) container_of(_kobj, struct raid_kobject, kobj) 2616ab0a202SJeff Mahoney 2626ab0a202SJeff Mahoney static ssize_t raid_bytes_show(struct kobject *kobj, 2636ab0a202SJeff Mahoney struct kobj_attribute *attr, char *buf); 2646ab0a202SJeff Mahoney BTRFS_RAID_ATTR(total_bytes, raid_bytes_show); 2656ab0a202SJeff Mahoney BTRFS_RAID_ATTR(used_bytes, raid_bytes_show); 2666ab0a202SJeff Mahoney 2676ab0a202SJeff Mahoney static ssize_t raid_bytes_show(struct kobject *kobj, 2686ab0a202SJeff Mahoney struct kobj_attribute *attr, char *buf) 2696ab0a202SJeff Mahoney 2706ab0a202SJeff Mahoney { 2716ab0a202SJeff Mahoney struct btrfs_space_info *sinfo = to_space_info(kobj->parent); 2726ab0a202SJeff Mahoney struct btrfs_block_group_cache *block_group; 273c1895442SJeff Mahoney int index = to_raid_kobj(kobj)->raid_type; 2746ab0a202SJeff Mahoney u64 val = 0; 2756ab0a202SJeff Mahoney 2766ab0a202SJeff Mahoney down_read(&sinfo->groups_sem); 2776ab0a202SJeff Mahoney list_for_each_entry(block_group, &sinfo->block_groups[index], list) { 2786ab0a202SJeff Mahoney if (&attr->attr == BTRFS_RAID_ATTR_PTR(total_bytes)) 2796ab0a202SJeff Mahoney val += block_group->key.offset; 2806ab0a202SJeff Mahoney else 2816ab0a202SJeff Mahoney val += btrfs_block_group_used(&block_group->item); 2826ab0a202SJeff Mahoney } 2836ab0a202SJeff Mahoney up_read(&sinfo->groups_sem); 2846ab0a202SJeff Mahoney return snprintf(buf, PAGE_SIZE, "%llu\n", val); 2856ab0a202SJeff Mahoney } 2866ab0a202SJeff Mahoney 2876ab0a202SJeff Mahoney static struct attribute *raid_attributes[] = { 2886ab0a202SJeff Mahoney BTRFS_RAID_ATTR_PTR(total_bytes), 2896ab0a202SJeff Mahoney BTRFS_RAID_ATTR_PTR(used_bytes), 2906ab0a202SJeff Mahoney NULL 2916ab0a202SJeff Mahoney }; 2926ab0a202SJeff Mahoney 2936ab0a202SJeff Mahoney static void release_raid_kobj(struct kobject *kobj) 2946ab0a202SJeff Mahoney { 295c1895442SJeff Mahoney kfree(to_raid_kobj(kobj)); 2966ab0a202SJeff Mahoney } 2976ab0a202SJeff Mahoney 2986ab0a202SJeff Mahoney struct kobj_type btrfs_raid_ktype = { 2996ab0a202SJeff Mahoney .sysfs_ops = &kobj_sysfs_ops, 3006ab0a202SJeff Mahoney .release = release_raid_kobj, 3016ab0a202SJeff Mahoney .default_attrs = raid_attributes, 3026ab0a202SJeff Mahoney }; 3036ab0a202SJeff Mahoney 3046ab0a202SJeff Mahoney #define SPACE_INFO_ATTR(field) \ 3056ab0a202SJeff Mahoney static ssize_t btrfs_space_info_show_##field(struct kobject *kobj, \ 3066ab0a202SJeff Mahoney struct kobj_attribute *a, \ 3076ab0a202SJeff Mahoney char *buf) \ 3086ab0a202SJeff Mahoney { \ 3096ab0a202SJeff Mahoney struct btrfs_space_info *sinfo = to_space_info(kobj); \ 3106ab0a202SJeff Mahoney return btrfs_show_u64(&sinfo->field, &sinfo->lock, buf); \ 3116ab0a202SJeff Mahoney } \ 31298b3d389SAnand Jain BTRFS_ATTR(field, btrfs_space_info_show_##field) 3136ab0a202SJeff Mahoney 3146ab0a202SJeff Mahoney static ssize_t btrfs_space_info_show_total_bytes_pinned(struct kobject *kobj, 3156ab0a202SJeff Mahoney struct kobj_attribute *a, 3166ab0a202SJeff Mahoney char *buf) 3176ab0a202SJeff Mahoney { 3186ab0a202SJeff Mahoney struct btrfs_space_info *sinfo = to_space_info(kobj); 3196ab0a202SJeff Mahoney s64 val = percpu_counter_sum(&sinfo->total_bytes_pinned); 3206ab0a202SJeff Mahoney return snprintf(buf, PAGE_SIZE, "%lld\n", val); 3216ab0a202SJeff Mahoney } 3226ab0a202SJeff Mahoney 3236ab0a202SJeff Mahoney SPACE_INFO_ATTR(flags); 3246ab0a202SJeff Mahoney SPACE_INFO_ATTR(total_bytes); 3256ab0a202SJeff Mahoney SPACE_INFO_ATTR(bytes_used); 3266ab0a202SJeff Mahoney SPACE_INFO_ATTR(bytes_pinned); 3276ab0a202SJeff Mahoney SPACE_INFO_ATTR(bytes_reserved); 3286ab0a202SJeff Mahoney SPACE_INFO_ATTR(bytes_may_use); 329c1fd5c30SWang Xiaoguang SPACE_INFO_ATTR(bytes_readonly); 3306ab0a202SJeff Mahoney SPACE_INFO_ATTR(disk_used); 3316ab0a202SJeff Mahoney SPACE_INFO_ATTR(disk_total); 33298b3d389SAnand Jain BTRFS_ATTR(total_bytes_pinned, btrfs_space_info_show_total_bytes_pinned); 3336ab0a202SJeff Mahoney 3346ab0a202SJeff Mahoney static struct attribute *space_info_attrs[] = { 3356ab0a202SJeff Mahoney BTRFS_ATTR_PTR(flags), 3366ab0a202SJeff Mahoney BTRFS_ATTR_PTR(total_bytes), 3376ab0a202SJeff Mahoney BTRFS_ATTR_PTR(bytes_used), 3386ab0a202SJeff Mahoney BTRFS_ATTR_PTR(bytes_pinned), 3396ab0a202SJeff Mahoney BTRFS_ATTR_PTR(bytes_reserved), 3406ab0a202SJeff Mahoney BTRFS_ATTR_PTR(bytes_may_use), 341c1fd5c30SWang Xiaoguang BTRFS_ATTR_PTR(bytes_readonly), 3426ab0a202SJeff Mahoney BTRFS_ATTR_PTR(disk_used), 3436ab0a202SJeff Mahoney BTRFS_ATTR_PTR(disk_total), 3446ab0a202SJeff Mahoney BTRFS_ATTR_PTR(total_bytes_pinned), 3456ab0a202SJeff Mahoney NULL, 3466ab0a202SJeff Mahoney }; 3476ab0a202SJeff Mahoney 3486ab0a202SJeff Mahoney static void space_info_release(struct kobject *kobj) 3496ab0a202SJeff Mahoney { 3506ab0a202SJeff Mahoney struct btrfs_space_info *sinfo = to_space_info(kobj); 3516ab0a202SJeff Mahoney percpu_counter_destroy(&sinfo->total_bytes_pinned); 3526ab0a202SJeff Mahoney kfree(sinfo); 3536ab0a202SJeff Mahoney } 3546ab0a202SJeff Mahoney 3556ab0a202SJeff Mahoney struct kobj_type space_info_ktype = { 3566ab0a202SJeff Mahoney .sysfs_ops = &kobj_sysfs_ops, 3576ab0a202SJeff Mahoney .release = space_info_release, 3586ab0a202SJeff Mahoney .default_attrs = space_info_attrs, 3596ab0a202SJeff Mahoney }; 3606ab0a202SJeff Mahoney 3616ab0a202SJeff Mahoney static const struct attribute *allocation_attrs[] = { 3626ab0a202SJeff Mahoney BTRFS_ATTR_PTR(global_rsv_reserved), 3636ab0a202SJeff Mahoney BTRFS_ATTR_PTR(global_rsv_size), 3646ab0a202SJeff Mahoney NULL, 3656ab0a202SJeff Mahoney }; 3666ab0a202SJeff Mahoney 367f8ba9c11SJeff Mahoney static ssize_t btrfs_label_show(struct kobject *kobj, 368f8ba9c11SJeff Mahoney struct kobj_attribute *a, char *buf) 369f8ba9c11SJeff Mahoney { 370f8ba9c11SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj); 37148fcc3ffSSatoru Takeuchi char *label = fs_info->super_copy->label; 372ee17fc80SDavid Sterba ssize_t ret; 373ee17fc80SDavid Sterba 374ee17fc80SDavid Sterba spin_lock(&fs_info->super_lock); 375ee17fc80SDavid Sterba ret = snprintf(buf, PAGE_SIZE, label[0] ? "%s\n" : "%s", label); 376ee17fc80SDavid Sterba spin_unlock(&fs_info->super_lock); 377ee17fc80SDavid Sterba 378ee17fc80SDavid Sterba return ret; 379f8ba9c11SJeff Mahoney } 380f8ba9c11SJeff Mahoney 381f8ba9c11SJeff Mahoney static ssize_t btrfs_label_store(struct kobject *kobj, 382f8ba9c11SJeff Mahoney struct kobj_attribute *a, 383f8ba9c11SJeff Mahoney const char *buf, size_t len) 384f8ba9c11SJeff Mahoney { 385f8ba9c11SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj); 38648fcc3ffSSatoru Takeuchi size_t p_len; 387f8ba9c11SJeff Mahoney 38866ac9fe7SDavid Sterba if (!fs_info) 38966ac9fe7SDavid Sterba return -EPERM; 39066ac9fe7SDavid Sterba 39179aec2b8SAnand Jain if (fs_info->sb->s_flags & MS_RDONLY) 39279aec2b8SAnand Jain return -EROFS; 39379aec2b8SAnand Jain 39448fcc3ffSSatoru Takeuchi /* 39548fcc3ffSSatoru Takeuchi * p_len is the len until the first occurrence of either 39648fcc3ffSSatoru Takeuchi * '\n' or '\0' 39748fcc3ffSSatoru Takeuchi */ 39848fcc3ffSSatoru Takeuchi p_len = strcspn(buf, "\n"); 39948fcc3ffSSatoru Takeuchi 40048fcc3ffSSatoru Takeuchi if (p_len >= BTRFS_LABEL_SIZE) 401f8ba9c11SJeff Mahoney return -EINVAL; 402f8ba9c11SJeff Mahoney 403a6f69dc8SDavid Sterba spin_lock(&fs_info->super_lock); 40448fcc3ffSSatoru Takeuchi memset(fs_info->super_copy->label, 0, BTRFS_LABEL_SIZE); 40548fcc3ffSSatoru Takeuchi memcpy(fs_info->super_copy->label, buf, p_len); 406a6f69dc8SDavid Sterba spin_unlock(&fs_info->super_lock); 407f8ba9c11SJeff Mahoney 408a6f69dc8SDavid Sterba /* 409a6f69dc8SDavid Sterba * We don't want to do full transaction commit from inside sysfs 410a6f69dc8SDavid Sterba */ 411a6f69dc8SDavid Sterba btrfs_set_pending(fs_info, COMMIT); 412a6f69dc8SDavid Sterba wake_up_process(fs_info->transaction_kthread); 413a6f69dc8SDavid Sterba 414f8ba9c11SJeff Mahoney return len; 415f8ba9c11SJeff Mahoney } 41620ee0825SAnand Jain BTRFS_ATTR_RW(label, btrfs_label_show, btrfs_label_store); 417f8ba9c11SJeff Mahoney 418df93589aSDavid Sterba static ssize_t btrfs_nodesize_show(struct kobject *kobj, 419df93589aSDavid Sterba struct kobj_attribute *a, char *buf) 420df93589aSDavid Sterba { 421df93589aSDavid Sterba struct btrfs_fs_info *fs_info = to_fs_info(kobj); 422df93589aSDavid Sterba 423df93589aSDavid Sterba return snprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->nodesize); 424df93589aSDavid Sterba } 425df93589aSDavid Sterba 42698b3d389SAnand Jain BTRFS_ATTR(nodesize, btrfs_nodesize_show); 427df93589aSDavid Sterba 428df93589aSDavid Sterba static ssize_t btrfs_sectorsize_show(struct kobject *kobj, 429df93589aSDavid Sterba struct kobj_attribute *a, char *buf) 430df93589aSDavid Sterba { 431df93589aSDavid Sterba struct btrfs_fs_info *fs_info = to_fs_info(kobj); 432df93589aSDavid Sterba 4335d163e0eSJeff Mahoney return snprintf(buf, PAGE_SIZE, "%u\n", 4345d163e0eSJeff Mahoney fs_info->super_copy->sectorsize); 435df93589aSDavid Sterba } 436df93589aSDavid Sterba 43798b3d389SAnand Jain BTRFS_ATTR(sectorsize, btrfs_sectorsize_show); 438df93589aSDavid Sterba 439df93589aSDavid Sterba static ssize_t btrfs_clone_alignment_show(struct kobject *kobj, 440df93589aSDavid Sterba struct kobj_attribute *a, char *buf) 441df93589aSDavid Sterba { 442df93589aSDavid Sterba struct btrfs_fs_info *fs_info = to_fs_info(kobj); 443df93589aSDavid Sterba 4445d163e0eSJeff Mahoney return snprintf(buf, PAGE_SIZE, "%u\n", 4455d163e0eSJeff Mahoney fs_info->super_copy->sectorsize); 446df93589aSDavid Sterba } 447df93589aSDavid Sterba 44898b3d389SAnand Jain BTRFS_ATTR(clone_alignment, btrfs_clone_alignment_show); 449df93589aSDavid Sterba 4500dd2906fSAnand Jain static const struct attribute *btrfs_attrs[] = { 451f8ba9c11SJeff Mahoney BTRFS_ATTR_PTR(label), 452df93589aSDavid Sterba BTRFS_ATTR_PTR(nodesize), 453df93589aSDavid Sterba BTRFS_ATTR_PTR(sectorsize), 454df93589aSDavid Sterba BTRFS_ATTR_PTR(clone_alignment), 455f8ba9c11SJeff Mahoney NULL, 456f8ba9c11SJeff Mahoney }; 457f8ba9c11SJeff Mahoney 458c1b7e474SAnand Jain static void btrfs_release_fsid_kobj(struct kobject *kobj) 459510d7360SJeff Mahoney { 4602e7910d6SAnand Jain struct btrfs_fs_devices *fs_devs = to_fs_devs(kobj); 461248d200dSAnand Jain 462c1b7e474SAnand Jain memset(&fs_devs->fsid_kobj, 0, sizeof(struct kobject)); 4632e7910d6SAnand Jain complete(&fs_devs->kobj_unregister); 464510d7360SJeff Mahoney } 465510d7360SJeff Mahoney 466510d7360SJeff Mahoney static struct kobj_type btrfs_ktype = { 467510d7360SJeff Mahoney .sysfs_ops = &kobj_sysfs_ops, 468c1b7e474SAnand Jain .release = btrfs_release_fsid_kobj, 469510d7360SJeff Mahoney }; 470510d7360SJeff Mahoney 4712e7910d6SAnand Jain static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj) 4722e7910d6SAnand Jain { 4732e7910d6SAnand Jain if (kobj->ktype != &btrfs_ktype) 4742e7910d6SAnand Jain return NULL; 475c1b7e474SAnand Jain return container_of(kobj, struct btrfs_fs_devices, fsid_kobj); 4762e7910d6SAnand Jain } 4772e7910d6SAnand Jain 478510d7360SJeff Mahoney static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj) 479510d7360SJeff Mahoney { 480510d7360SJeff Mahoney if (kobj->ktype != &btrfs_ktype) 481510d7360SJeff Mahoney return NULL; 4822e7910d6SAnand Jain return to_fs_devs(kobj)->fs_info; 483510d7360SJeff Mahoney } 48458176a96SJosef Bacik 485e453d989SJeff Mahoney #define NUM_FEATURE_BITS 64 486e453d989SJeff Mahoney static char btrfs_unknown_feature_names[3][NUM_FEATURE_BITS][13]; 487e453d989SJeff Mahoney static struct btrfs_feature_attr btrfs_feature_attrs[3][NUM_FEATURE_BITS]; 488e453d989SJeff Mahoney 489e8c9f186SDavid Sterba static const u64 supported_feature_masks[3] = { 490e453d989SJeff Mahoney [FEAT_COMPAT] = BTRFS_FEATURE_COMPAT_SUPP, 491e453d989SJeff Mahoney [FEAT_COMPAT_RO] = BTRFS_FEATURE_COMPAT_RO_SUPP, 492e453d989SJeff Mahoney [FEAT_INCOMPAT] = BTRFS_FEATURE_INCOMPAT_SUPP, 493e453d989SJeff Mahoney }; 494e453d989SJeff Mahoney 495e453d989SJeff Mahoney static int addrm_unknown_feature_attrs(struct btrfs_fs_info *fs_info, bool add) 4965ac1d209SJeff Mahoney { 497e453d989SJeff Mahoney int set; 498e453d989SJeff Mahoney 499e453d989SJeff Mahoney for (set = 0; set < FEAT_MAX; set++) { 500e453d989SJeff Mahoney int i; 501e453d989SJeff Mahoney struct attribute *attrs[2]; 502e453d989SJeff Mahoney struct attribute_group agroup = { 503e453d989SJeff Mahoney .name = "features", 504e453d989SJeff Mahoney .attrs = attrs, 505e453d989SJeff Mahoney }; 506e453d989SJeff Mahoney u64 features = get_features(fs_info, set); 507e453d989SJeff Mahoney features &= ~supported_feature_masks[set]; 508e453d989SJeff Mahoney 509e453d989SJeff Mahoney if (!features) 510e453d989SJeff Mahoney continue; 511e453d989SJeff Mahoney 512e453d989SJeff Mahoney attrs[1] = NULL; 513e453d989SJeff Mahoney for (i = 0; i < NUM_FEATURE_BITS; i++) { 514e453d989SJeff Mahoney struct btrfs_feature_attr *fa; 515e453d989SJeff Mahoney 516e453d989SJeff Mahoney if (!(features & (1ULL << i))) 517e453d989SJeff Mahoney continue; 518e453d989SJeff Mahoney 519e453d989SJeff Mahoney fa = &btrfs_feature_attrs[set][i]; 520e453d989SJeff Mahoney attrs[0] = &fa->kobj_attr.attr; 521e453d989SJeff Mahoney if (add) { 522e453d989SJeff Mahoney int ret; 523c1b7e474SAnand Jain ret = sysfs_merge_group(&fs_info->fs_devices->fsid_kobj, 524e453d989SJeff Mahoney &agroup); 525e453d989SJeff Mahoney if (ret) 526e453d989SJeff Mahoney return ret; 527e453d989SJeff Mahoney } else 528c1b7e474SAnand Jain sysfs_unmerge_group(&fs_info->fs_devices->fsid_kobj, 529e453d989SJeff Mahoney &agroup); 530e453d989SJeff Mahoney } 531e453d989SJeff Mahoney 532e453d989SJeff Mahoney } 533e453d989SJeff Mahoney return 0; 534e453d989SJeff Mahoney } 535e453d989SJeff Mahoney 5362e3e1281SAnand Jain static void __btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs) 537e453d989SJeff Mahoney { 5382e7910d6SAnand Jain if (fs_devs->device_dir_kobj) { 5392e7910d6SAnand Jain kobject_del(fs_devs->device_dir_kobj); 5402e7910d6SAnand Jain kobject_put(fs_devs->device_dir_kobj); 5412e7910d6SAnand Jain fs_devs->device_dir_kobj = NULL; 542aaf13305SAnand Jain } 543aaf13305SAnand Jain 544c1b7e474SAnand Jain if (fs_devs->fsid_kobj.state_initialized) { 545c1b7e474SAnand Jain kobject_del(&fs_devs->fsid_kobj); 546c1b7e474SAnand Jain kobject_put(&fs_devs->fsid_kobj); 5472e7910d6SAnand Jain wait_for_completion(&fs_devs->kobj_unregister); 5485ac1d209SJeff Mahoney } 549f90fc547SAnand Jain } 5505ac1d209SJeff Mahoney 5512e3e1281SAnand Jain /* when fs_devs is NULL it will remove all fsid kobject */ 5521d1c1be3SAnand Jain void btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs) 5532e3e1281SAnand Jain { 5542e3e1281SAnand Jain struct list_head *fs_uuids = btrfs_get_fs_uuids(); 5552e3e1281SAnand Jain 5562e3e1281SAnand Jain if (fs_devs) { 5572e3e1281SAnand Jain __btrfs_sysfs_remove_fsid(fs_devs); 5582e3e1281SAnand Jain return; 5592e3e1281SAnand Jain } 5602e3e1281SAnand Jain 5612e3e1281SAnand Jain list_for_each_entry(fs_devs, fs_uuids, list) { 5622e3e1281SAnand Jain __btrfs_sysfs_remove_fsid(fs_devs); 5632e3e1281SAnand Jain } 5642e3e1281SAnand Jain } 5652e3e1281SAnand Jain 5666618a59bSAnand Jain void btrfs_sysfs_remove_mounted(struct btrfs_fs_info *fs_info) 567e453d989SJeff Mahoney { 5685a13f430SAnand Jain btrfs_reset_fs_info_ptr(fs_info); 5695a13f430SAnand Jain 570e453d989SJeff Mahoney if (fs_info->space_info_kobj) { 571e453d989SJeff Mahoney sysfs_remove_files(fs_info->space_info_kobj, allocation_attrs); 572e453d989SJeff Mahoney kobject_del(fs_info->space_info_kobj); 573e453d989SJeff Mahoney kobject_put(fs_info->space_info_kobj); 574e453d989SJeff Mahoney } 575e453d989SJeff Mahoney addrm_unknown_feature_attrs(fs_info, false); 576c1b7e474SAnand Jain sysfs_remove_group(&fs_info->fs_devices->fsid_kobj, &btrfs_feature_attr_group); 577c1b7e474SAnand Jain sysfs_remove_files(&fs_info->fs_devices->fsid_kobj, btrfs_attrs); 57832576040SAnand Jain btrfs_sysfs_rm_device_link(fs_info->fs_devices, NULL); 579e453d989SJeff Mahoney } 580e453d989SJeff Mahoney 58179da4fa4SJeff Mahoney const char * const btrfs_feature_set_names[3] = { 58279da4fa4SJeff Mahoney [FEAT_COMPAT] = "compat", 58379da4fa4SJeff Mahoney [FEAT_COMPAT_RO] = "compat_ro", 58479da4fa4SJeff Mahoney [FEAT_INCOMPAT] = "incompat", 58579da4fa4SJeff Mahoney }; 58679da4fa4SJeff Mahoney 5873b02a68aSJeff Mahoney char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags) 5883b02a68aSJeff Mahoney { 5893b02a68aSJeff Mahoney size_t bufsize = 4096; /* safe max, 64 names * 64 bytes */ 5903b02a68aSJeff Mahoney int len = 0; 5913b02a68aSJeff Mahoney int i; 5923b02a68aSJeff Mahoney char *str; 5933b02a68aSJeff Mahoney 5943b02a68aSJeff Mahoney str = kmalloc(bufsize, GFP_KERNEL); 5953b02a68aSJeff Mahoney if (!str) 5963b02a68aSJeff Mahoney return str; 5973b02a68aSJeff Mahoney 5983b02a68aSJeff Mahoney for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { 5993b02a68aSJeff Mahoney const char *name; 6003b02a68aSJeff Mahoney 6013b02a68aSJeff Mahoney if (!(flags & (1ULL << i))) 6023b02a68aSJeff Mahoney continue; 6033b02a68aSJeff Mahoney 6043b02a68aSJeff Mahoney name = btrfs_feature_attrs[set][i].kobj_attr.attr.name; 6053b02a68aSJeff Mahoney len += snprintf(str + len, bufsize - len, "%s%s", 6063b02a68aSJeff Mahoney len ? "," : "", name); 6073b02a68aSJeff Mahoney } 6083b02a68aSJeff Mahoney 6093b02a68aSJeff Mahoney return str; 6103b02a68aSJeff Mahoney } 6113b02a68aSJeff Mahoney 61279da4fa4SJeff Mahoney static void init_feature_attrs(void) 61379da4fa4SJeff Mahoney { 61479da4fa4SJeff Mahoney struct btrfs_feature_attr *fa; 61579da4fa4SJeff Mahoney int set, i; 61679da4fa4SJeff Mahoney 61779da4fa4SJeff Mahoney BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names) != 61879da4fa4SJeff Mahoney ARRAY_SIZE(btrfs_feature_attrs)); 61979da4fa4SJeff Mahoney BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names[0]) != 62079da4fa4SJeff Mahoney ARRAY_SIZE(btrfs_feature_attrs[0])); 62179da4fa4SJeff Mahoney 6223b02a68aSJeff Mahoney memset(btrfs_feature_attrs, 0, sizeof(btrfs_feature_attrs)); 6233b02a68aSJeff Mahoney memset(btrfs_unknown_feature_names, 0, 6243b02a68aSJeff Mahoney sizeof(btrfs_unknown_feature_names)); 6253b02a68aSJeff Mahoney 62679da4fa4SJeff Mahoney for (i = 0; btrfs_supported_feature_attrs[i]; i++) { 62779da4fa4SJeff Mahoney struct btrfs_feature_attr *sfa; 62879da4fa4SJeff Mahoney struct attribute *a = btrfs_supported_feature_attrs[i]; 6293b02a68aSJeff Mahoney int bit; 63079da4fa4SJeff Mahoney sfa = attr_to_btrfs_feature_attr(a); 6313b02a68aSJeff Mahoney bit = ilog2(sfa->feature_bit); 6323b02a68aSJeff Mahoney fa = &btrfs_feature_attrs[sfa->feature_set][bit]; 63379da4fa4SJeff Mahoney 63479da4fa4SJeff Mahoney fa->kobj_attr.attr.name = sfa->kobj_attr.attr.name; 63579da4fa4SJeff Mahoney } 63679da4fa4SJeff Mahoney 63779da4fa4SJeff Mahoney for (set = 0; set < FEAT_MAX; set++) { 63879da4fa4SJeff Mahoney for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { 63979da4fa4SJeff Mahoney char *name = btrfs_unknown_feature_names[set][i]; 64079da4fa4SJeff Mahoney fa = &btrfs_feature_attrs[set][i]; 64179da4fa4SJeff Mahoney 64279da4fa4SJeff Mahoney if (fa->kobj_attr.attr.name) 64379da4fa4SJeff Mahoney continue; 64479da4fa4SJeff Mahoney 64579da4fa4SJeff Mahoney snprintf(name, 13, "%s:%u", 64679da4fa4SJeff Mahoney btrfs_feature_set_names[set], i); 64779da4fa4SJeff Mahoney 64879da4fa4SJeff Mahoney fa->kobj_attr.attr.name = name; 64979da4fa4SJeff Mahoney fa->kobj_attr.attr.mode = S_IRUGO; 65079da4fa4SJeff Mahoney fa->feature_set = set; 65179da4fa4SJeff Mahoney fa->feature_bit = 1ULL << i; 65279da4fa4SJeff Mahoney } 65379da4fa4SJeff Mahoney } 65479da4fa4SJeff Mahoney } 65579da4fa4SJeff Mahoney 656e7e1aa9cSAnand Jain /* when one_device is NULL, it removes all device links */ 657e7e1aa9cSAnand Jain 65832576040SAnand Jain int btrfs_sysfs_rm_device_link(struct btrfs_fs_devices *fs_devices, 65999994cdeSAnand Jain struct btrfs_device *one_device) 66099994cdeSAnand Jain { 66199994cdeSAnand Jain struct hd_struct *disk; 66299994cdeSAnand Jain struct kobject *disk_kobj; 66399994cdeSAnand Jain 6646c14a164SAnand Jain if (!fs_devices->device_dir_kobj) 66599994cdeSAnand Jain return -EINVAL; 66699994cdeSAnand Jain 66787fa3bb0SLiu Bo if (one_device && one_device->bdev) { 66899994cdeSAnand Jain disk = one_device->bdev->bd_part; 66999994cdeSAnand Jain disk_kobj = &part_to_dev(disk)->kobj; 67099994cdeSAnand Jain 6716c14a164SAnand Jain sysfs_remove_link(fs_devices->device_dir_kobj, 67299994cdeSAnand Jain disk_kobj->name); 67399994cdeSAnand Jain } 67499994cdeSAnand Jain 675e7e1aa9cSAnand Jain if (one_device) 676e7e1aa9cSAnand Jain return 0; 677e7e1aa9cSAnand Jain 678e7e1aa9cSAnand Jain list_for_each_entry(one_device, 6796c14a164SAnand Jain &fs_devices->devices, dev_list) { 680e7e1aa9cSAnand Jain if (!one_device->bdev) 681e7e1aa9cSAnand Jain continue; 682e7e1aa9cSAnand Jain disk = one_device->bdev->bd_part; 683e7e1aa9cSAnand Jain disk_kobj = &part_to_dev(disk)->kobj; 684e7e1aa9cSAnand Jain 6856c14a164SAnand Jain sysfs_remove_link(fs_devices->device_dir_kobj, 686e7e1aa9cSAnand Jain disk_kobj->name); 687e7e1aa9cSAnand Jain } 688e7e1aa9cSAnand Jain 68999994cdeSAnand Jain return 0; 69099994cdeSAnand Jain } 69199994cdeSAnand Jain 6922e7910d6SAnand Jain int btrfs_sysfs_add_device(struct btrfs_fs_devices *fs_devs) 69300c921c2SAnand Jain { 6942e7910d6SAnand Jain if (!fs_devs->device_dir_kobj) 6952e7910d6SAnand Jain fs_devs->device_dir_kobj = kobject_create_and_add("devices", 696c1b7e474SAnand Jain &fs_devs->fsid_kobj); 69700c921c2SAnand Jain 6982e7910d6SAnand Jain if (!fs_devs->device_dir_kobj) 69900c921c2SAnand Jain return -ENOMEM; 70000c921c2SAnand Jain 70100c921c2SAnand Jain return 0; 70200c921c2SAnand Jain } 70300c921c2SAnand Jain 704e3bd6973SAnand Jain int btrfs_sysfs_add_device_link(struct btrfs_fs_devices *fs_devices, 7050d39376aSAnand Jain struct btrfs_device *one_device) 70629e5be24SJeff Mahoney { 70729e5be24SJeff Mahoney int error = 0; 70829e5be24SJeff Mahoney struct btrfs_device *dev; 70929e5be24SJeff Mahoney 71029e5be24SJeff Mahoney list_for_each_entry(dev, &fs_devices->devices, dev_list) { 711f085381eSAnand Jain struct hd_struct *disk; 712f085381eSAnand Jain struct kobject *disk_kobj; 713f085381eSAnand Jain 714f085381eSAnand Jain if (!dev->bdev) 715f085381eSAnand Jain continue; 716f085381eSAnand Jain 7170d39376aSAnand Jain if (one_device && one_device != dev) 7180d39376aSAnand Jain continue; 7190d39376aSAnand Jain 720f085381eSAnand Jain disk = dev->bdev->bd_part; 721f085381eSAnand Jain disk_kobj = &part_to_dev(disk)->kobj; 72229e5be24SJeff Mahoney 7232e7910d6SAnand Jain error = sysfs_create_link(fs_devices->device_dir_kobj, 72429e5be24SJeff Mahoney disk_kobj, disk_kobj->name); 72529e5be24SJeff Mahoney if (error) 72629e5be24SJeff Mahoney break; 72729e5be24SJeff Mahoney } 72829e5be24SJeff Mahoney 72929e5be24SJeff Mahoney return error; 73029e5be24SJeff Mahoney } 73129e5be24SJeff Mahoney 732510d7360SJeff Mahoney /* /sys/fs/btrfs/ entry */ 733510d7360SJeff Mahoney static struct kset *btrfs_kset; 734510d7360SJeff Mahoney 7351bae3098SDavid Sterba /* /sys/kernel/debug/btrfs */ 7361bae3098SDavid Sterba static struct dentry *btrfs_debugfs_root_dentry; 7371bae3098SDavid Sterba 7381bae3098SDavid Sterba /* Debugging tunables and exported data */ 7391bae3098SDavid Sterba u64 btrfs_debugfs_test; 7401bae3098SDavid Sterba 74172059215SAnand Jain /* 74272059215SAnand Jain * Can be called by the device discovery thread. 74372059215SAnand Jain * And parent can be specified for seed device 74472059215SAnand Jain */ 7450c10e2d4SAnand Jain int btrfs_sysfs_add_fsid(struct btrfs_fs_devices *fs_devs, 74672059215SAnand Jain struct kobject *parent) 7475ac1d209SJeff Mahoney { 7485ac1d209SJeff Mahoney int error; 7495ac1d209SJeff Mahoney 7502e7910d6SAnand Jain init_completion(&fs_devs->kobj_unregister); 751c1b7e474SAnand Jain fs_devs->fsid_kobj.kset = btrfs_kset; 752c1b7e474SAnand Jain error = kobject_init_and_add(&fs_devs->fsid_kobj, 75324bd69cbSAnand Jain &btrfs_ktype, parent, "%pU", fs_devs->fsid); 75472059215SAnand Jain return error; 75572059215SAnand Jain } 75672059215SAnand Jain 75796f3136eSAnand Jain int btrfs_sysfs_add_mounted(struct btrfs_fs_info *fs_info) 75872059215SAnand Jain { 75972059215SAnand Jain int error; 7602e7910d6SAnand Jain struct btrfs_fs_devices *fs_devs = fs_info->fs_devices; 761c1b7e474SAnand Jain struct kobject *fsid_kobj = &fs_devs->fsid_kobj; 76272059215SAnand Jain 7635a13f430SAnand Jain btrfs_set_fs_info_ptr(fs_info); 7645a13f430SAnand Jain 765e3bd6973SAnand Jain error = btrfs_sysfs_add_device_link(fs_devs, NULL); 766e453d989SJeff Mahoney if (error) 767e453d989SJeff Mahoney return error; 768510d7360SJeff Mahoney 769c1b7e474SAnand Jain error = sysfs_create_files(fsid_kobj, btrfs_attrs); 770e453d989SJeff Mahoney if (error) { 77132576040SAnand Jain btrfs_sysfs_rm_device_link(fs_devs, NULL); 772e453d989SJeff Mahoney return error; 773e453d989SJeff Mahoney } 77479da4fa4SJeff Mahoney 775c1b7e474SAnand Jain error = sysfs_create_group(fsid_kobj, 7760dd2906fSAnand Jain &btrfs_feature_attr_group); 7770dd2906fSAnand Jain if (error) 7780dd2906fSAnand Jain goto failure; 7790dd2906fSAnand Jain 780e453d989SJeff Mahoney error = addrm_unknown_feature_attrs(fs_info, true); 78179da4fa4SJeff Mahoney if (error) 78279da4fa4SJeff Mahoney goto failure; 78379da4fa4SJeff Mahoney 7846ab0a202SJeff Mahoney fs_info->space_info_kobj = kobject_create_and_add("allocation", 785c1b7e474SAnand Jain fsid_kobj); 7866ab0a202SJeff Mahoney if (!fs_info->space_info_kobj) { 7876ab0a202SJeff Mahoney error = -ENOMEM; 7886ab0a202SJeff Mahoney goto failure; 7896ab0a202SJeff Mahoney } 7906ab0a202SJeff Mahoney 7916ab0a202SJeff Mahoney error = sysfs_create_files(fs_info->space_info_kobj, allocation_attrs); 7926ab0a202SJeff Mahoney if (error) 7936ab0a202SJeff Mahoney goto failure; 7946ab0a202SJeff Mahoney 79579da4fa4SJeff Mahoney return 0; 79679da4fa4SJeff Mahoney failure: 7976618a59bSAnand Jain btrfs_sysfs_remove_mounted(fs_info); 7985ac1d209SJeff Mahoney return error; 7995ac1d209SJeff Mahoney } 8005ac1d209SJeff Mahoney 801444e7516SDavid Sterba 802444e7516SDavid Sterba /* 803444e7516SDavid Sterba * Change per-fs features in /sys/fs/btrfs/UUID/features to match current 804444e7516SDavid Sterba * values in superblock. Call after any changes to incompat/compat_ro flags 805444e7516SDavid Sterba */ 806444e7516SDavid Sterba void btrfs_sysfs_feature_update(struct btrfs_fs_info *fs_info, 807444e7516SDavid Sterba u64 bit, enum btrfs_feature_set set) 808444e7516SDavid Sterba { 809444e7516SDavid Sterba struct btrfs_fs_devices *fs_devs; 810444e7516SDavid Sterba struct kobject *fsid_kobj; 811444e7516SDavid Sterba u64 features; 812444e7516SDavid Sterba int ret; 813444e7516SDavid Sterba 814444e7516SDavid Sterba if (!fs_info) 815444e7516SDavid Sterba return; 816444e7516SDavid Sterba 817444e7516SDavid Sterba features = get_features(fs_info, set); 818444e7516SDavid Sterba ASSERT(bit & supported_feature_masks[set]); 819444e7516SDavid Sterba 820444e7516SDavid Sterba fs_devs = fs_info->fs_devices; 821444e7516SDavid Sterba fsid_kobj = &fs_devs->fsid_kobj; 822444e7516SDavid Sterba 823bf609206SDavid Sterba if (!fsid_kobj->state_initialized) 824bf609206SDavid Sterba return; 825bf609206SDavid Sterba 826444e7516SDavid Sterba /* 827444e7516SDavid Sterba * FIXME: this is too heavy to update just one value, ideally we'd like 828444e7516SDavid Sterba * to use sysfs_update_group but some refactoring is needed first. 829444e7516SDavid Sterba */ 830444e7516SDavid Sterba sysfs_remove_group(fsid_kobj, &btrfs_feature_attr_group); 831444e7516SDavid Sterba ret = sysfs_create_group(fsid_kobj, &btrfs_feature_attr_group); 832444e7516SDavid Sterba } 833444e7516SDavid Sterba 8341bae3098SDavid Sterba static int btrfs_init_debugfs(void) 8351bae3098SDavid Sterba { 8361bae3098SDavid Sterba #ifdef CONFIG_DEBUG_FS 8371bae3098SDavid Sterba btrfs_debugfs_root_dentry = debugfs_create_dir("btrfs", NULL); 8381bae3098SDavid Sterba if (!btrfs_debugfs_root_dentry) 8391bae3098SDavid Sterba return -ENOMEM; 8401bae3098SDavid Sterba 841b0de6c4cSDavid Sterba /* 842b0de6c4cSDavid Sterba * Example code, how to export data through debugfs. 843b0de6c4cSDavid Sterba * 844b0de6c4cSDavid Sterba * file: /sys/kernel/debug/btrfs/test 845b0de6c4cSDavid Sterba * contents of: btrfs_debugfs_test 846b0de6c4cSDavid Sterba */ 847b0de6c4cSDavid Sterba #ifdef CONFIG_BTRFS_DEBUG 84807f6a480SEric Sandeen debugfs_create_u64("test", S_IRUGO | S_IWUSR, btrfs_debugfs_root_dentry, 8491bae3098SDavid Sterba &btrfs_debugfs_test); 8501bae3098SDavid Sterba #endif 851b0de6c4cSDavid Sterba 852b0de6c4cSDavid Sterba #endif 8531bae3098SDavid Sterba return 0; 8541bae3098SDavid Sterba } 8551bae3098SDavid Sterba 856b214107eSChristoph Hellwig int btrfs_init_sysfs(void) 85758176a96SJosef Bacik { 858079b72bcSJeff Mahoney int ret; 8591bae3098SDavid Sterba 860e3fe4e71SGreg KH btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj); 861e3fe4e71SGreg KH if (!btrfs_kset) 862e3fe4e71SGreg KH return -ENOMEM; 863079b72bcSJeff Mahoney 8641bae3098SDavid Sterba ret = btrfs_init_debugfs(); 8651bae3098SDavid Sterba if (ret) 866001a648dSFilipe Manana goto out1; 867079b72bcSJeff Mahoney 8681bae3098SDavid Sterba init_feature_attrs(); 8691bae3098SDavid Sterba ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); 870001a648dSFilipe Manana if (ret) 871001a648dSFilipe Manana goto out2; 872001a648dSFilipe Manana 873001a648dSFilipe Manana return 0; 874001a648dSFilipe Manana out2: 875001a648dSFilipe Manana debugfs_remove_recursive(btrfs_debugfs_root_dentry); 876001a648dSFilipe Manana out1: 877001a648dSFilipe Manana kset_unregister(btrfs_kset); 8781bae3098SDavid Sterba 8791bae3098SDavid Sterba return ret; 88058176a96SJosef Bacik } 88158176a96SJosef Bacik 882b214107eSChristoph Hellwig void btrfs_exit_sysfs(void) 88358176a96SJosef Bacik { 884079b72bcSJeff Mahoney sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); 885e3fe4e71SGreg KH kset_unregister(btrfs_kset); 8861bae3098SDavid Sterba debugfs_remove_recursive(btrfs_debugfs_root_dentry); 88758176a96SJosef Bacik } 88855d47414SChris Mason 889