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> 2758176a96SJosef Bacik 28bae45de0SChris Mason #include "ctree.h" 29bae45de0SChris Mason #include "disk-io.h" 30bae45de0SChris Mason #include "transaction.h" 31079b72bcSJeff Mahoney #include "sysfs.h" 3229e5be24SJeff Mahoney #include "volumes.h" 33079b72bcSJeff Mahoney 34510d7360SJeff Mahoney static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj); 355ac1d209SJeff Mahoney 36510d7360SJeff Mahoney static u64 get_features(struct btrfs_fs_info *fs_info, 37510d7360SJeff Mahoney enum btrfs_feature_set set) 385ac1d209SJeff Mahoney { 39510d7360SJeff Mahoney struct btrfs_super_block *disk_super = fs_info->super_copy; 40510d7360SJeff Mahoney if (set == FEAT_COMPAT) 41510d7360SJeff Mahoney return btrfs_super_compat_flags(disk_super); 42510d7360SJeff Mahoney else if (set == FEAT_COMPAT_RO) 43510d7360SJeff Mahoney return btrfs_super_compat_ro_flags(disk_super); 44510d7360SJeff Mahoney else 45510d7360SJeff Mahoney return btrfs_super_incompat_flags(disk_super); 465ac1d209SJeff Mahoney } 475ac1d209SJeff Mahoney 48ba631941SJeff Mahoney static void set_features(struct btrfs_fs_info *fs_info, 49ba631941SJeff Mahoney enum btrfs_feature_set set, u64 features) 50ba631941SJeff Mahoney { 51ba631941SJeff Mahoney struct btrfs_super_block *disk_super = fs_info->super_copy; 52ba631941SJeff Mahoney if (set == FEAT_COMPAT) 53ba631941SJeff Mahoney btrfs_set_super_compat_flags(disk_super, features); 54ba631941SJeff Mahoney else if (set == FEAT_COMPAT_RO) 55ba631941SJeff Mahoney btrfs_set_super_compat_ro_flags(disk_super, features); 56ba631941SJeff Mahoney else 57ba631941SJeff Mahoney btrfs_set_super_incompat_flags(disk_super, features); 58ba631941SJeff Mahoney } 59ba631941SJeff Mahoney 60ba631941SJeff Mahoney static int can_modify_feature(struct btrfs_feature_attr *fa) 61ba631941SJeff Mahoney { 62ba631941SJeff Mahoney int val = 0; 63ba631941SJeff Mahoney u64 set, clear; 64ba631941SJeff Mahoney switch (fa->feature_set) { 65ba631941SJeff Mahoney case FEAT_COMPAT: 66ba631941SJeff Mahoney set = BTRFS_FEATURE_COMPAT_SAFE_SET; 67ba631941SJeff Mahoney clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR; 68ba631941SJeff Mahoney break; 69ba631941SJeff Mahoney case FEAT_COMPAT_RO: 70ba631941SJeff Mahoney set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET; 71ba631941SJeff Mahoney clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR; 72ba631941SJeff Mahoney break; 73ba631941SJeff Mahoney case FEAT_INCOMPAT: 74ba631941SJeff Mahoney set = BTRFS_FEATURE_INCOMPAT_SAFE_SET; 75ba631941SJeff Mahoney clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR; 76ba631941SJeff Mahoney break; 77ba631941SJeff Mahoney default: 78ba631941SJeff Mahoney BUG(); 79ba631941SJeff Mahoney } 80ba631941SJeff Mahoney 81ba631941SJeff Mahoney if (set & fa->feature_bit) 82ba631941SJeff Mahoney val |= 1; 83ba631941SJeff Mahoney if (clear & fa->feature_bit) 84ba631941SJeff Mahoney val |= 2; 85ba631941SJeff Mahoney 86ba631941SJeff Mahoney return val; 87ba631941SJeff Mahoney } 88ba631941SJeff Mahoney 89079b72bcSJeff Mahoney static ssize_t btrfs_feature_attr_show(struct kobject *kobj, 90079b72bcSJeff Mahoney struct kobj_attribute *a, char *buf) 91079b72bcSJeff Mahoney { 92510d7360SJeff Mahoney int val = 0; 93510d7360SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj); 94510d7360SJeff Mahoney struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a); 95ba631941SJeff Mahoney if (fs_info) { 96510d7360SJeff Mahoney u64 features = get_features(fs_info, fa->feature_set); 97510d7360SJeff Mahoney if (features & fa->feature_bit) 98510d7360SJeff Mahoney val = 1; 99ba631941SJeff Mahoney } else 100ba631941SJeff Mahoney val = can_modify_feature(fa); 101510d7360SJeff Mahoney 102510d7360SJeff Mahoney return snprintf(buf, PAGE_SIZE, "%d\n", val); 103510d7360SJeff Mahoney } 104510d7360SJeff Mahoney 105ba631941SJeff Mahoney static ssize_t btrfs_feature_attr_store(struct kobject *kobj, 106ba631941SJeff Mahoney struct kobj_attribute *a, 107ba631941SJeff Mahoney const char *buf, size_t count) 108ba631941SJeff Mahoney { 109ba631941SJeff Mahoney struct btrfs_fs_info *fs_info; 110ba631941SJeff Mahoney struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a); 111ba631941SJeff Mahoney struct btrfs_trans_handle *trans; 112ba631941SJeff Mahoney u64 features, set, clear; 113ba631941SJeff Mahoney unsigned long val; 114ba631941SJeff Mahoney int ret; 115ba631941SJeff Mahoney 116ba631941SJeff Mahoney fs_info = to_fs_info(kobj); 117ba631941SJeff Mahoney if (!fs_info) 118ba631941SJeff Mahoney return -EPERM; 119ba631941SJeff Mahoney 120ba631941SJeff Mahoney ret = kstrtoul(skip_spaces(buf), 0, &val); 121ba631941SJeff Mahoney if (ret) 122ba631941SJeff Mahoney return ret; 123ba631941SJeff Mahoney 124ba631941SJeff Mahoney if (fa->feature_set == FEAT_COMPAT) { 125ba631941SJeff Mahoney set = BTRFS_FEATURE_COMPAT_SAFE_SET; 126ba631941SJeff Mahoney clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR; 127ba631941SJeff Mahoney } else if (fa->feature_set == FEAT_COMPAT_RO) { 128ba631941SJeff Mahoney set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET; 129ba631941SJeff Mahoney clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR; 130ba631941SJeff Mahoney } else { 131ba631941SJeff Mahoney set = BTRFS_FEATURE_INCOMPAT_SAFE_SET; 132ba631941SJeff Mahoney clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR; 133ba631941SJeff Mahoney } 134ba631941SJeff Mahoney 135ba631941SJeff Mahoney features = get_features(fs_info, fa->feature_set); 136ba631941SJeff Mahoney 137ba631941SJeff Mahoney /* Nothing to do */ 138ba631941SJeff Mahoney if ((val && (features & fa->feature_bit)) || 139ba631941SJeff Mahoney (!val && !(features & fa->feature_bit))) 140ba631941SJeff Mahoney return count; 141ba631941SJeff Mahoney 142ba631941SJeff Mahoney if ((val && !(set & fa->feature_bit)) || 143ba631941SJeff Mahoney (!val && !(clear & fa->feature_bit))) { 144ba631941SJeff Mahoney btrfs_info(fs_info, 145ba631941SJeff Mahoney "%sabling feature %s on mounted fs is not supported.", 146ba631941SJeff Mahoney val ? "En" : "Dis", fa->kobj_attr.attr.name); 147ba631941SJeff Mahoney return -EPERM; 148ba631941SJeff Mahoney } 149ba631941SJeff Mahoney 150ba631941SJeff Mahoney btrfs_info(fs_info, "%s %s feature flag", 151ba631941SJeff Mahoney val ? "Setting" : "Clearing", fa->kobj_attr.attr.name); 152ba631941SJeff Mahoney 153ba631941SJeff Mahoney trans = btrfs_start_transaction(fs_info->fs_root, 1); 154ba631941SJeff Mahoney if (IS_ERR(trans)) 155ba631941SJeff Mahoney return PTR_ERR(trans); 156ba631941SJeff Mahoney 157ba631941SJeff Mahoney spin_lock(&fs_info->super_lock); 158ba631941SJeff Mahoney features = get_features(fs_info, fa->feature_set); 159ba631941SJeff Mahoney if (val) 160ba631941SJeff Mahoney features |= fa->feature_bit; 161ba631941SJeff Mahoney else 162ba631941SJeff Mahoney features &= ~fa->feature_bit; 163ba631941SJeff Mahoney set_features(fs_info, fa->feature_set, features); 164ba631941SJeff Mahoney spin_unlock(&fs_info->super_lock); 165ba631941SJeff Mahoney 166ba631941SJeff Mahoney ret = btrfs_commit_transaction(trans, fs_info->fs_root); 167ba631941SJeff Mahoney if (ret) 168ba631941SJeff Mahoney return ret; 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(compress_lzov2, COMPRESS_LZOv2); 200079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(big_metadata, BIG_METADATA); 201079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(extended_iref, EXTENDED_IREF); 202079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(raid56, RAID56); 203079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(skinny_metadata, SKINNY_METADATA); 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(compress_lzov2), 211079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(big_metadata), 212079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(extended_iref), 213079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(raid56), 214079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(skinny_metadata), 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 } 2426ab0a202SJeff Mahoney BTRFS_ATTR(global_rsv_size, 0444, 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 } 2516ab0a202SJeff Mahoney BTRFS_ATTR(global_rsv_reserved, 0444, global_rsv_reserved_show); 2526ab0a202SJeff Mahoney 2536ab0a202SJeff Mahoney #define to_space_info(_kobj) container_of(_kobj, struct btrfs_space_info, kobj) 2546ab0a202SJeff Mahoney 2556ab0a202SJeff Mahoney static ssize_t raid_bytes_show(struct kobject *kobj, 2566ab0a202SJeff Mahoney struct kobj_attribute *attr, char *buf); 2576ab0a202SJeff Mahoney BTRFS_RAID_ATTR(total_bytes, raid_bytes_show); 2586ab0a202SJeff Mahoney BTRFS_RAID_ATTR(used_bytes, raid_bytes_show); 2596ab0a202SJeff Mahoney 2606ab0a202SJeff Mahoney static ssize_t raid_bytes_show(struct kobject *kobj, 2616ab0a202SJeff Mahoney struct kobj_attribute *attr, char *buf) 2626ab0a202SJeff Mahoney 2636ab0a202SJeff Mahoney { 2646ab0a202SJeff Mahoney struct btrfs_space_info *sinfo = to_space_info(kobj->parent); 2656ab0a202SJeff Mahoney struct btrfs_block_group_cache *block_group; 2666ab0a202SJeff Mahoney int index = kobj - sinfo->block_group_kobjs; 2676ab0a202SJeff Mahoney u64 val = 0; 2686ab0a202SJeff Mahoney 2696ab0a202SJeff Mahoney down_read(&sinfo->groups_sem); 2706ab0a202SJeff Mahoney list_for_each_entry(block_group, &sinfo->block_groups[index], list) { 2716ab0a202SJeff Mahoney if (&attr->attr == BTRFS_RAID_ATTR_PTR(total_bytes)) 2726ab0a202SJeff Mahoney val += block_group->key.offset; 2736ab0a202SJeff Mahoney else 2746ab0a202SJeff Mahoney val += btrfs_block_group_used(&block_group->item); 2756ab0a202SJeff Mahoney } 2766ab0a202SJeff Mahoney up_read(&sinfo->groups_sem); 2776ab0a202SJeff Mahoney return snprintf(buf, PAGE_SIZE, "%llu\n", val); 2786ab0a202SJeff Mahoney } 2796ab0a202SJeff Mahoney 2806ab0a202SJeff Mahoney static struct attribute *raid_attributes[] = { 2816ab0a202SJeff Mahoney BTRFS_RAID_ATTR_PTR(total_bytes), 2826ab0a202SJeff Mahoney BTRFS_RAID_ATTR_PTR(used_bytes), 2836ab0a202SJeff Mahoney NULL 2846ab0a202SJeff Mahoney }; 2856ab0a202SJeff Mahoney 2866ab0a202SJeff Mahoney static void release_raid_kobj(struct kobject *kobj) 2876ab0a202SJeff Mahoney { 2886ab0a202SJeff Mahoney kobject_put(kobj->parent); 2896ab0a202SJeff Mahoney } 2906ab0a202SJeff Mahoney 2916ab0a202SJeff Mahoney struct kobj_type btrfs_raid_ktype = { 2926ab0a202SJeff Mahoney .sysfs_ops = &kobj_sysfs_ops, 2936ab0a202SJeff Mahoney .release = release_raid_kobj, 2946ab0a202SJeff Mahoney .default_attrs = raid_attributes, 2956ab0a202SJeff Mahoney }; 2966ab0a202SJeff Mahoney 2976ab0a202SJeff Mahoney #define SPACE_INFO_ATTR(field) \ 2986ab0a202SJeff Mahoney static ssize_t btrfs_space_info_show_##field(struct kobject *kobj, \ 2996ab0a202SJeff Mahoney struct kobj_attribute *a, \ 3006ab0a202SJeff Mahoney char *buf) \ 3016ab0a202SJeff Mahoney { \ 3026ab0a202SJeff Mahoney struct btrfs_space_info *sinfo = to_space_info(kobj); \ 3036ab0a202SJeff Mahoney return btrfs_show_u64(&sinfo->field, &sinfo->lock, buf); \ 3046ab0a202SJeff Mahoney } \ 3056ab0a202SJeff Mahoney BTRFS_ATTR(field, 0444, btrfs_space_info_show_##field) 3066ab0a202SJeff Mahoney 3076ab0a202SJeff Mahoney static ssize_t btrfs_space_info_show_total_bytes_pinned(struct kobject *kobj, 3086ab0a202SJeff Mahoney struct kobj_attribute *a, 3096ab0a202SJeff Mahoney char *buf) 3106ab0a202SJeff Mahoney { 3116ab0a202SJeff Mahoney struct btrfs_space_info *sinfo = to_space_info(kobj); 3126ab0a202SJeff Mahoney s64 val = percpu_counter_sum(&sinfo->total_bytes_pinned); 3136ab0a202SJeff Mahoney return snprintf(buf, PAGE_SIZE, "%lld\n", val); 3146ab0a202SJeff Mahoney } 3156ab0a202SJeff Mahoney 3166ab0a202SJeff Mahoney SPACE_INFO_ATTR(flags); 3176ab0a202SJeff Mahoney SPACE_INFO_ATTR(total_bytes); 3186ab0a202SJeff Mahoney SPACE_INFO_ATTR(bytes_used); 3196ab0a202SJeff Mahoney SPACE_INFO_ATTR(bytes_pinned); 3206ab0a202SJeff Mahoney SPACE_INFO_ATTR(bytes_reserved); 3216ab0a202SJeff Mahoney SPACE_INFO_ATTR(bytes_may_use); 3226ab0a202SJeff Mahoney SPACE_INFO_ATTR(disk_used); 3236ab0a202SJeff Mahoney SPACE_INFO_ATTR(disk_total); 3246ab0a202SJeff Mahoney BTRFS_ATTR(total_bytes_pinned, 0444, btrfs_space_info_show_total_bytes_pinned); 3256ab0a202SJeff Mahoney 3266ab0a202SJeff Mahoney static struct attribute *space_info_attrs[] = { 3276ab0a202SJeff Mahoney BTRFS_ATTR_PTR(flags), 3286ab0a202SJeff Mahoney BTRFS_ATTR_PTR(total_bytes), 3296ab0a202SJeff Mahoney BTRFS_ATTR_PTR(bytes_used), 3306ab0a202SJeff Mahoney BTRFS_ATTR_PTR(bytes_pinned), 3316ab0a202SJeff Mahoney BTRFS_ATTR_PTR(bytes_reserved), 3326ab0a202SJeff Mahoney BTRFS_ATTR_PTR(bytes_may_use), 3336ab0a202SJeff Mahoney BTRFS_ATTR_PTR(disk_used), 3346ab0a202SJeff Mahoney BTRFS_ATTR_PTR(disk_total), 3356ab0a202SJeff Mahoney BTRFS_ATTR_PTR(total_bytes_pinned), 3366ab0a202SJeff Mahoney NULL, 3376ab0a202SJeff Mahoney }; 3386ab0a202SJeff Mahoney 3396ab0a202SJeff Mahoney static void space_info_release(struct kobject *kobj) 3406ab0a202SJeff Mahoney { 3416ab0a202SJeff Mahoney struct btrfs_space_info *sinfo = to_space_info(kobj); 3426ab0a202SJeff Mahoney percpu_counter_destroy(&sinfo->total_bytes_pinned); 3436ab0a202SJeff Mahoney kfree(sinfo); 3446ab0a202SJeff Mahoney } 3456ab0a202SJeff Mahoney 3466ab0a202SJeff Mahoney struct kobj_type space_info_ktype = { 3476ab0a202SJeff Mahoney .sysfs_ops = &kobj_sysfs_ops, 3486ab0a202SJeff Mahoney .release = space_info_release, 3496ab0a202SJeff Mahoney .default_attrs = space_info_attrs, 3506ab0a202SJeff Mahoney }; 3516ab0a202SJeff Mahoney 3526ab0a202SJeff Mahoney static const struct attribute *allocation_attrs[] = { 3536ab0a202SJeff Mahoney BTRFS_ATTR_PTR(global_rsv_reserved), 3546ab0a202SJeff Mahoney BTRFS_ATTR_PTR(global_rsv_size), 3556ab0a202SJeff Mahoney NULL, 3566ab0a202SJeff Mahoney }; 3576ab0a202SJeff Mahoney 358510d7360SJeff Mahoney static void btrfs_release_super_kobj(struct kobject *kobj) 359510d7360SJeff Mahoney { 360510d7360SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj); 361510d7360SJeff Mahoney complete(&fs_info->kobj_unregister); 362510d7360SJeff Mahoney } 363510d7360SJeff Mahoney 364510d7360SJeff Mahoney static struct kobj_type btrfs_ktype = { 365510d7360SJeff Mahoney .sysfs_ops = &kobj_sysfs_ops, 366510d7360SJeff Mahoney .release = btrfs_release_super_kobj, 367510d7360SJeff Mahoney }; 368510d7360SJeff Mahoney 369510d7360SJeff Mahoney static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj) 370510d7360SJeff Mahoney { 371510d7360SJeff Mahoney if (kobj->ktype != &btrfs_ktype) 372510d7360SJeff Mahoney return NULL; 373510d7360SJeff Mahoney return container_of(kobj, struct btrfs_fs_info, super_kobj); 374510d7360SJeff Mahoney } 37558176a96SJosef Bacik 3765ac1d209SJeff Mahoney void btrfs_sysfs_remove_one(struct btrfs_fs_info *fs_info) 3775ac1d209SJeff Mahoney { 3786ab0a202SJeff Mahoney sysfs_remove_files(fs_info->space_info_kobj, allocation_attrs); 37929e5be24SJeff Mahoney kobject_del(fs_info->device_dir_kobj); 38029e5be24SJeff Mahoney kobject_put(fs_info->device_dir_kobj); 3816ab0a202SJeff Mahoney kobject_del(fs_info->space_info_kobj); 3826ab0a202SJeff Mahoney kobject_put(fs_info->space_info_kobj); 3835ac1d209SJeff Mahoney kobject_del(&fs_info->super_kobj); 3845ac1d209SJeff Mahoney kobject_put(&fs_info->super_kobj); 3855ac1d209SJeff Mahoney wait_for_completion(&fs_info->kobj_unregister); 3865ac1d209SJeff Mahoney } 3875ac1d209SJeff Mahoney 38879da4fa4SJeff Mahoney const char * const btrfs_feature_set_names[3] = { 38979da4fa4SJeff Mahoney [FEAT_COMPAT] = "compat", 39079da4fa4SJeff Mahoney [FEAT_COMPAT_RO] = "compat_ro", 39179da4fa4SJeff Mahoney [FEAT_INCOMPAT] = "incompat", 39279da4fa4SJeff Mahoney }; 39379da4fa4SJeff Mahoney 39479da4fa4SJeff Mahoney #define NUM_FEATURE_BITS 64 39579da4fa4SJeff Mahoney static char btrfs_unknown_feature_names[3][NUM_FEATURE_BITS][13]; 39679da4fa4SJeff Mahoney static struct btrfs_feature_attr btrfs_feature_attrs[3][NUM_FEATURE_BITS]; 39779da4fa4SJeff Mahoney 3983b02a68aSJeff Mahoney char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags) 3993b02a68aSJeff Mahoney { 4003b02a68aSJeff Mahoney size_t bufsize = 4096; /* safe max, 64 names * 64 bytes */ 4013b02a68aSJeff Mahoney int len = 0; 4023b02a68aSJeff Mahoney int i; 4033b02a68aSJeff Mahoney char *str; 4043b02a68aSJeff Mahoney 4053b02a68aSJeff Mahoney str = kmalloc(bufsize, GFP_KERNEL); 4063b02a68aSJeff Mahoney if (!str) 4073b02a68aSJeff Mahoney return str; 4083b02a68aSJeff Mahoney 4093b02a68aSJeff Mahoney for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { 4103b02a68aSJeff Mahoney const char *name; 4113b02a68aSJeff Mahoney 4123b02a68aSJeff Mahoney if (!(flags & (1ULL << i))) 4133b02a68aSJeff Mahoney continue; 4143b02a68aSJeff Mahoney 4153b02a68aSJeff Mahoney name = btrfs_feature_attrs[set][i].kobj_attr.attr.name; 4163b02a68aSJeff Mahoney len += snprintf(str + len, bufsize - len, "%s%s", 4173b02a68aSJeff Mahoney len ? "," : "", name); 4183b02a68aSJeff Mahoney } 4193b02a68aSJeff Mahoney 4203b02a68aSJeff Mahoney return str; 4213b02a68aSJeff Mahoney } 4223b02a68aSJeff Mahoney 42379da4fa4SJeff Mahoney static void init_feature_attrs(void) 42479da4fa4SJeff Mahoney { 42579da4fa4SJeff Mahoney struct btrfs_feature_attr *fa; 42679da4fa4SJeff Mahoney int set, i; 42779da4fa4SJeff Mahoney 42879da4fa4SJeff Mahoney BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names) != 42979da4fa4SJeff Mahoney ARRAY_SIZE(btrfs_feature_attrs)); 43079da4fa4SJeff Mahoney BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names[0]) != 43179da4fa4SJeff Mahoney ARRAY_SIZE(btrfs_feature_attrs[0])); 43279da4fa4SJeff Mahoney 4333b02a68aSJeff Mahoney memset(btrfs_feature_attrs, 0, sizeof(btrfs_feature_attrs)); 4343b02a68aSJeff Mahoney memset(btrfs_unknown_feature_names, 0, 4353b02a68aSJeff Mahoney sizeof(btrfs_unknown_feature_names)); 4363b02a68aSJeff Mahoney 43779da4fa4SJeff Mahoney for (i = 0; btrfs_supported_feature_attrs[i]; i++) { 43879da4fa4SJeff Mahoney struct btrfs_feature_attr *sfa; 43979da4fa4SJeff Mahoney struct attribute *a = btrfs_supported_feature_attrs[i]; 4403b02a68aSJeff Mahoney int bit; 44179da4fa4SJeff Mahoney sfa = attr_to_btrfs_feature_attr(a); 4423b02a68aSJeff Mahoney bit = ilog2(sfa->feature_bit); 4433b02a68aSJeff Mahoney fa = &btrfs_feature_attrs[sfa->feature_set][bit]; 44479da4fa4SJeff Mahoney 44579da4fa4SJeff Mahoney fa->kobj_attr.attr.name = sfa->kobj_attr.attr.name; 44679da4fa4SJeff Mahoney } 44779da4fa4SJeff Mahoney 44879da4fa4SJeff Mahoney for (set = 0; set < FEAT_MAX; set++) { 44979da4fa4SJeff Mahoney for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { 45079da4fa4SJeff Mahoney char *name = btrfs_unknown_feature_names[set][i]; 45179da4fa4SJeff Mahoney fa = &btrfs_feature_attrs[set][i]; 45279da4fa4SJeff Mahoney 45379da4fa4SJeff Mahoney if (fa->kobj_attr.attr.name) 45479da4fa4SJeff Mahoney continue; 45579da4fa4SJeff Mahoney 45679da4fa4SJeff Mahoney snprintf(name, 13, "%s:%u", 45779da4fa4SJeff Mahoney btrfs_feature_set_names[set], i); 45879da4fa4SJeff Mahoney 45979da4fa4SJeff Mahoney fa->kobj_attr.attr.name = name; 46079da4fa4SJeff Mahoney fa->kobj_attr.attr.mode = S_IRUGO; 46179da4fa4SJeff Mahoney fa->feature_set = set; 46279da4fa4SJeff Mahoney fa->feature_bit = 1ULL << i; 46379da4fa4SJeff Mahoney } 46479da4fa4SJeff Mahoney } 46579da4fa4SJeff Mahoney } 46679da4fa4SJeff Mahoney 46779da4fa4SJeff Mahoney static u64 supported_feature_masks[3] = { 46879da4fa4SJeff Mahoney [FEAT_COMPAT] = BTRFS_FEATURE_COMPAT_SUPP, 46979da4fa4SJeff Mahoney [FEAT_COMPAT_RO] = BTRFS_FEATURE_COMPAT_RO_SUPP, 47079da4fa4SJeff Mahoney [FEAT_INCOMPAT] = BTRFS_FEATURE_INCOMPAT_SUPP, 47179da4fa4SJeff Mahoney }; 47279da4fa4SJeff Mahoney 47379da4fa4SJeff Mahoney static int add_unknown_feature_attrs(struct btrfs_fs_info *fs_info) 47479da4fa4SJeff Mahoney { 47579da4fa4SJeff Mahoney int set; 47679da4fa4SJeff Mahoney 47779da4fa4SJeff Mahoney for (set = 0; set < FEAT_MAX; set++) { 47879da4fa4SJeff Mahoney int i, count, ret, index = 0; 47979da4fa4SJeff Mahoney struct attribute **attrs; 48079da4fa4SJeff Mahoney struct attribute_group agroup = { 48179da4fa4SJeff Mahoney .name = "features", 48279da4fa4SJeff Mahoney }; 48379da4fa4SJeff Mahoney u64 features = get_features(fs_info, set); 48479da4fa4SJeff Mahoney features &= ~supported_feature_masks[set]; 48579da4fa4SJeff Mahoney 48679da4fa4SJeff Mahoney count = hweight64(features); 48779da4fa4SJeff Mahoney 48879da4fa4SJeff Mahoney if (!count) 48979da4fa4SJeff Mahoney continue; 49079da4fa4SJeff Mahoney 49179da4fa4SJeff Mahoney attrs = kcalloc(count + 1, sizeof(void *), GFP_KERNEL); 49279da4fa4SJeff Mahoney 49379da4fa4SJeff Mahoney for (i = 0; i < NUM_FEATURE_BITS; i++) { 49479da4fa4SJeff Mahoney struct btrfs_feature_attr *fa; 49579da4fa4SJeff Mahoney 49679da4fa4SJeff Mahoney if (!(features & (1ULL << i))) 49779da4fa4SJeff Mahoney continue; 49879da4fa4SJeff Mahoney 49979da4fa4SJeff Mahoney fa = &btrfs_feature_attrs[set][i]; 50079da4fa4SJeff Mahoney attrs[index++] = &fa->kobj_attr.attr; 50179da4fa4SJeff Mahoney } 50279da4fa4SJeff Mahoney 50379da4fa4SJeff Mahoney attrs[index] = NULL; 50479da4fa4SJeff Mahoney agroup.attrs = attrs; 50579da4fa4SJeff Mahoney 50679da4fa4SJeff Mahoney ret = sysfs_merge_group(&fs_info->super_kobj, &agroup); 50779da4fa4SJeff Mahoney kfree(attrs); 50879da4fa4SJeff Mahoney if (ret) 50979da4fa4SJeff Mahoney return ret; 51079da4fa4SJeff Mahoney } 51179da4fa4SJeff Mahoney return 0; 51279da4fa4SJeff Mahoney } 51379da4fa4SJeff Mahoney 51429e5be24SJeff Mahoney static int add_device_membership(struct btrfs_fs_info *fs_info) 51529e5be24SJeff Mahoney { 51629e5be24SJeff Mahoney int error = 0; 51729e5be24SJeff Mahoney struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; 51829e5be24SJeff Mahoney struct btrfs_device *dev; 51929e5be24SJeff Mahoney 52029e5be24SJeff Mahoney fs_info->device_dir_kobj = kobject_create_and_add("devices", 52129e5be24SJeff Mahoney &fs_info->super_kobj); 52229e5be24SJeff Mahoney if (!fs_info->device_dir_kobj) 52329e5be24SJeff Mahoney return -ENOMEM; 52429e5be24SJeff Mahoney 52529e5be24SJeff Mahoney list_for_each_entry(dev, &fs_devices->devices, dev_list) { 52629e5be24SJeff Mahoney struct hd_struct *disk = dev->bdev->bd_part; 52729e5be24SJeff Mahoney struct kobject *disk_kobj = &part_to_dev(disk)->kobj; 52829e5be24SJeff Mahoney 52929e5be24SJeff Mahoney error = sysfs_create_link(fs_info->device_dir_kobj, 53029e5be24SJeff Mahoney disk_kobj, disk_kobj->name); 53129e5be24SJeff Mahoney if (error) 53229e5be24SJeff Mahoney break; 53329e5be24SJeff Mahoney } 53429e5be24SJeff Mahoney 53529e5be24SJeff Mahoney return error; 53629e5be24SJeff Mahoney } 53729e5be24SJeff Mahoney 538510d7360SJeff Mahoney /* /sys/fs/btrfs/ entry */ 539510d7360SJeff Mahoney static struct kset *btrfs_kset; 540510d7360SJeff Mahoney 5415ac1d209SJeff Mahoney int btrfs_sysfs_add_one(struct btrfs_fs_info *fs_info) 5425ac1d209SJeff Mahoney { 5435ac1d209SJeff Mahoney int error; 5445ac1d209SJeff Mahoney 5455ac1d209SJeff Mahoney init_completion(&fs_info->kobj_unregister); 546510d7360SJeff Mahoney fs_info->super_kobj.kset = btrfs_kset; 5475ac1d209SJeff Mahoney error = kobject_init_and_add(&fs_info->super_kobj, &btrfs_ktype, NULL, 5485ac1d209SJeff Mahoney "%pU", fs_info->fsid); 549510d7360SJeff Mahoney 550510d7360SJeff Mahoney error = sysfs_create_group(&fs_info->super_kobj, 551510d7360SJeff Mahoney &btrfs_feature_attr_group); 552510d7360SJeff Mahoney if (error) 55379da4fa4SJeff Mahoney goto failure; 55479da4fa4SJeff Mahoney 55579da4fa4SJeff Mahoney error = add_unknown_feature_attrs(fs_info); 55679da4fa4SJeff Mahoney if (error) 55779da4fa4SJeff Mahoney goto failure; 55879da4fa4SJeff Mahoney 55929e5be24SJeff Mahoney error = add_device_membership(fs_info); 56029e5be24SJeff Mahoney if (error) 56129e5be24SJeff Mahoney goto failure; 56229e5be24SJeff Mahoney 5636ab0a202SJeff Mahoney fs_info->space_info_kobj = kobject_create_and_add("allocation", 5646ab0a202SJeff Mahoney &fs_info->super_kobj); 5656ab0a202SJeff Mahoney if (!fs_info->space_info_kobj) { 5666ab0a202SJeff Mahoney error = -ENOMEM; 5676ab0a202SJeff Mahoney goto failure; 5686ab0a202SJeff Mahoney } 5696ab0a202SJeff Mahoney 5706ab0a202SJeff Mahoney error = sysfs_create_files(fs_info->space_info_kobj, allocation_attrs); 5716ab0a202SJeff Mahoney if (error) 5726ab0a202SJeff Mahoney goto failure; 5736ab0a202SJeff Mahoney 57479da4fa4SJeff Mahoney return 0; 57579da4fa4SJeff Mahoney failure: 576510d7360SJeff Mahoney btrfs_sysfs_remove_one(fs_info); 5775ac1d209SJeff Mahoney return error; 5785ac1d209SJeff Mahoney } 5795ac1d209SJeff Mahoney 580b214107eSChristoph Hellwig int btrfs_init_sysfs(void) 58158176a96SJosef Bacik { 582079b72bcSJeff Mahoney int ret; 583e3fe4e71SGreg KH btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj); 584e3fe4e71SGreg KH if (!btrfs_kset) 585e3fe4e71SGreg KH return -ENOMEM; 586079b72bcSJeff Mahoney 58779da4fa4SJeff Mahoney init_feature_attrs(); 58879da4fa4SJeff Mahoney 589079b72bcSJeff Mahoney ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); 590079b72bcSJeff Mahoney if (ret) { 591079b72bcSJeff Mahoney kset_unregister(btrfs_kset); 592079b72bcSJeff Mahoney return ret; 593079b72bcSJeff Mahoney } 594079b72bcSJeff Mahoney 595e3fe4e71SGreg KH return 0; 59658176a96SJosef Bacik } 59758176a96SJosef Bacik 598b214107eSChristoph Hellwig void btrfs_exit_sysfs(void) 59958176a96SJosef Bacik { 600079b72bcSJeff Mahoney sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); 601e3fe4e71SGreg KH kset_unregister(btrfs_kset); 60258176a96SJosef Bacik } 60355d47414SChris Mason 604