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 123bc98a42cSDavid Howells if (sb_rdonly(fs_info->sb)) 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); 2035c1aab1dSNick Terrell BTRFS_FEAT_ATTR_INCOMPAT(compress_zstd, COMPRESS_ZSTD); 204079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(big_metadata, BIG_METADATA); 205079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(extended_iref, EXTENDED_IREF); 206079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(raid56, RAID56); 207079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(skinny_metadata, SKINNY_METADATA); 208c736c095SDavid Sterba BTRFS_FEAT_ATTR_INCOMPAT(no_holes, NO_HOLES); 2093b5bb73bSDavid Sterba BTRFS_FEAT_ATTR_COMPAT_RO(free_space_tree, FREE_SPACE_TREE); 210079b72bcSJeff Mahoney 211079b72bcSJeff Mahoney static struct attribute *btrfs_supported_feature_attrs[] = { 212079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(mixed_backref), 213079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(default_subvol), 214079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(mixed_groups), 215079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(compress_lzo), 2165c1aab1dSNick Terrell BTRFS_FEAT_ATTR_PTR(compress_zstd), 217079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(big_metadata), 218079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(extended_iref), 219079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(raid56), 220079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(skinny_metadata), 221c736c095SDavid Sterba BTRFS_FEAT_ATTR_PTR(no_holes), 2223b5bb73bSDavid Sterba BTRFS_FEAT_ATTR_PTR(free_space_tree), 223079b72bcSJeff Mahoney NULL 224079b72bcSJeff Mahoney }; 225079b72bcSJeff Mahoney 226079b72bcSJeff Mahoney static const struct attribute_group btrfs_feature_attr_group = { 227079b72bcSJeff Mahoney .name = "features", 228510d7360SJeff Mahoney .is_visible = btrfs_feature_visible, 229079b72bcSJeff Mahoney .attrs = btrfs_supported_feature_attrs, 230079b72bcSJeff Mahoney }; 23158176a96SJosef Bacik 2326ab0a202SJeff Mahoney static ssize_t btrfs_show_u64(u64 *value_ptr, spinlock_t *lock, char *buf) 2336ab0a202SJeff Mahoney { 2346ab0a202SJeff Mahoney u64 val; 2356ab0a202SJeff Mahoney if (lock) 2366ab0a202SJeff Mahoney spin_lock(lock); 2376ab0a202SJeff Mahoney val = *value_ptr; 2386ab0a202SJeff Mahoney if (lock) 2396ab0a202SJeff Mahoney spin_unlock(lock); 2406ab0a202SJeff Mahoney return snprintf(buf, PAGE_SIZE, "%llu\n", val); 2416ab0a202SJeff Mahoney } 2426ab0a202SJeff Mahoney 2436ab0a202SJeff Mahoney static ssize_t global_rsv_size_show(struct kobject *kobj, 2446ab0a202SJeff Mahoney struct kobj_attribute *ka, char *buf) 2456ab0a202SJeff Mahoney { 2466ab0a202SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); 2476ab0a202SJeff Mahoney struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 2486ab0a202SJeff Mahoney return btrfs_show_u64(&block_rsv->size, &block_rsv->lock, buf); 2496ab0a202SJeff Mahoney } 250a969f4ccSHans van Kranenburg BTRFS_ATTR(allocation, global_rsv_size, global_rsv_size_show); 2516ab0a202SJeff Mahoney 2526ab0a202SJeff Mahoney static ssize_t global_rsv_reserved_show(struct kobject *kobj, 2536ab0a202SJeff Mahoney struct kobj_attribute *a, char *buf) 2546ab0a202SJeff Mahoney { 2556ab0a202SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); 2566ab0a202SJeff Mahoney struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 2576ab0a202SJeff Mahoney return btrfs_show_u64(&block_rsv->reserved, &block_rsv->lock, buf); 2586ab0a202SJeff Mahoney } 259a969f4ccSHans van Kranenburg BTRFS_ATTR(allocation, global_rsv_reserved, global_rsv_reserved_show); 2606ab0a202SJeff Mahoney 2616ab0a202SJeff Mahoney #define to_space_info(_kobj) container_of(_kobj, struct btrfs_space_info, kobj) 262c1895442SJeff Mahoney #define to_raid_kobj(_kobj) container_of(_kobj, struct raid_kobject, kobj) 2636ab0a202SJeff Mahoney 2646ab0a202SJeff Mahoney static ssize_t raid_bytes_show(struct kobject *kobj, 2656ab0a202SJeff Mahoney struct kobj_attribute *attr, char *buf); 266a969f4ccSHans van Kranenburg BTRFS_ATTR(raid, total_bytes, raid_bytes_show); 267a969f4ccSHans van Kranenburg BTRFS_ATTR(raid, used_bytes, raid_bytes_show); 2686ab0a202SJeff Mahoney 2696ab0a202SJeff Mahoney static ssize_t raid_bytes_show(struct kobject *kobj, 2706ab0a202SJeff Mahoney struct kobj_attribute *attr, char *buf) 2716ab0a202SJeff Mahoney 2726ab0a202SJeff Mahoney { 2736ab0a202SJeff Mahoney struct btrfs_space_info *sinfo = to_space_info(kobj->parent); 2746ab0a202SJeff Mahoney struct btrfs_block_group_cache *block_group; 275c1895442SJeff Mahoney int index = to_raid_kobj(kobj)->raid_type; 2766ab0a202SJeff Mahoney u64 val = 0; 2776ab0a202SJeff Mahoney 2786ab0a202SJeff Mahoney down_read(&sinfo->groups_sem); 2796ab0a202SJeff Mahoney list_for_each_entry(block_group, &sinfo->block_groups[index], list) { 280a969f4ccSHans van Kranenburg if (&attr->attr == BTRFS_ATTR_PTR(raid, total_bytes)) 2816ab0a202SJeff Mahoney val += block_group->key.offset; 2826ab0a202SJeff Mahoney else 2836ab0a202SJeff Mahoney val += btrfs_block_group_used(&block_group->item); 2846ab0a202SJeff Mahoney } 2856ab0a202SJeff Mahoney up_read(&sinfo->groups_sem); 2866ab0a202SJeff Mahoney return snprintf(buf, PAGE_SIZE, "%llu\n", val); 2876ab0a202SJeff Mahoney } 2886ab0a202SJeff Mahoney 2896ab0a202SJeff Mahoney static struct attribute *raid_attributes[] = { 290a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(raid, total_bytes), 291a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(raid, used_bytes), 2926ab0a202SJeff Mahoney NULL 2936ab0a202SJeff Mahoney }; 2946ab0a202SJeff Mahoney 2956ab0a202SJeff Mahoney static void release_raid_kobj(struct kobject *kobj) 2966ab0a202SJeff Mahoney { 297c1895442SJeff Mahoney kfree(to_raid_kobj(kobj)); 2986ab0a202SJeff Mahoney } 2996ab0a202SJeff Mahoney 3006ab0a202SJeff Mahoney struct kobj_type btrfs_raid_ktype = { 3016ab0a202SJeff Mahoney .sysfs_ops = &kobj_sysfs_ops, 3026ab0a202SJeff Mahoney .release = release_raid_kobj, 3036ab0a202SJeff Mahoney .default_attrs = raid_attributes, 3046ab0a202SJeff Mahoney }; 3056ab0a202SJeff Mahoney 3066ab0a202SJeff Mahoney #define SPACE_INFO_ATTR(field) \ 3076ab0a202SJeff Mahoney static ssize_t btrfs_space_info_show_##field(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 return btrfs_show_u64(&sinfo->field, &sinfo->lock, buf); \ 3136ab0a202SJeff Mahoney } \ 314a969f4ccSHans van Kranenburg BTRFS_ATTR(space_info, field, btrfs_space_info_show_##field) 3156ab0a202SJeff Mahoney 3166ab0a202SJeff Mahoney static ssize_t btrfs_space_info_show_total_bytes_pinned(struct kobject *kobj, 3176ab0a202SJeff Mahoney struct kobj_attribute *a, 3186ab0a202SJeff Mahoney char *buf) 3196ab0a202SJeff Mahoney { 3206ab0a202SJeff Mahoney struct btrfs_space_info *sinfo = to_space_info(kobj); 3216ab0a202SJeff Mahoney s64 val = percpu_counter_sum(&sinfo->total_bytes_pinned); 3226ab0a202SJeff Mahoney return snprintf(buf, PAGE_SIZE, "%lld\n", val); 3236ab0a202SJeff Mahoney } 3246ab0a202SJeff Mahoney 3256ab0a202SJeff Mahoney SPACE_INFO_ATTR(flags); 3266ab0a202SJeff Mahoney SPACE_INFO_ATTR(total_bytes); 3276ab0a202SJeff Mahoney SPACE_INFO_ATTR(bytes_used); 3286ab0a202SJeff Mahoney SPACE_INFO_ATTR(bytes_pinned); 3296ab0a202SJeff Mahoney SPACE_INFO_ATTR(bytes_reserved); 3306ab0a202SJeff Mahoney SPACE_INFO_ATTR(bytes_may_use); 331c1fd5c30SWang Xiaoguang SPACE_INFO_ATTR(bytes_readonly); 3326ab0a202SJeff Mahoney SPACE_INFO_ATTR(disk_used); 3336ab0a202SJeff Mahoney SPACE_INFO_ATTR(disk_total); 334a969f4ccSHans van Kranenburg BTRFS_ATTR(space_info, total_bytes_pinned, 335a969f4ccSHans van Kranenburg btrfs_space_info_show_total_bytes_pinned); 3366ab0a202SJeff Mahoney 3376ab0a202SJeff Mahoney static struct attribute *space_info_attrs[] = { 338a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, flags), 339a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, total_bytes), 340a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, bytes_used), 341a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, bytes_pinned), 342a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, bytes_reserved), 343a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, bytes_may_use), 344a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, bytes_readonly), 345a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, disk_used), 346a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, disk_total), 347a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, total_bytes_pinned), 3486ab0a202SJeff Mahoney NULL, 3496ab0a202SJeff Mahoney }; 3506ab0a202SJeff Mahoney 3516ab0a202SJeff Mahoney static void space_info_release(struct kobject *kobj) 3526ab0a202SJeff Mahoney { 3536ab0a202SJeff Mahoney struct btrfs_space_info *sinfo = to_space_info(kobj); 3546ab0a202SJeff Mahoney percpu_counter_destroy(&sinfo->total_bytes_pinned); 3556ab0a202SJeff Mahoney kfree(sinfo); 3566ab0a202SJeff Mahoney } 3576ab0a202SJeff Mahoney 3586ab0a202SJeff Mahoney struct kobj_type space_info_ktype = { 3596ab0a202SJeff Mahoney .sysfs_ops = &kobj_sysfs_ops, 3606ab0a202SJeff Mahoney .release = space_info_release, 3616ab0a202SJeff Mahoney .default_attrs = space_info_attrs, 3626ab0a202SJeff Mahoney }; 3636ab0a202SJeff Mahoney 3646ab0a202SJeff Mahoney static const struct attribute *allocation_attrs[] = { 365a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(allocation, global_rsv_reserved), 366a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(allocation, global_rsv_size), 3676ab0a202SJeff Mahoney NULL, 3686ab0a202SJeff Mahoney }; 3696ab0a202SJeff Mahoney 370f8ba9c11SJeff Mahoney static ssize_t btrfs_label_show(struct kobject *kobj, 371f8ba9c11SJeff Mahoney struct kobj_attribute *a, char *buf) 372f8ba9c11SJeff Mahoney { 373f8ba9c11SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj); 37448fcc3ffSSatoru Takeuchi char *label = fs_info->super_copy->label; 375ee17fc80SDavid Sterba ssize_t ret; 376ee17fc80SDavid Sterba 377ee17fc80SDavid Sterba spin_lock(&fs_info->super_lock); 378ee17fc80SDavid Sterba ret = snprintf(buf, PAGE_SIZE, label[0] ? "%s\n" : "%s", label); 379ee17fc80SDavid Sterba spin_unlock(&fs_info->super_lock); 380ee17fc80SDavid Sterba 381ee17fc80SDavid Sterba return ret; 382f8ba9c11SJeff Mahoney } 383f8ba9c11SJeff Mahoney 384f8ba9c11SJeff Mahoney static ssize_t btrfs_label_store(struct kobject *kobj, 385f8ba9c11SJeff Mahoney struct kobj_attribute *a, 386f8ba9c11SJeff Mahoney const char *buf, size_t len) 387f8ba9c11SJeff Mahoney { 388f8ba9c11SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj); 38948fcc3ffSSatoru Takeuchi size_t p_len; 390f8ba9c11SJeff Mahoney 39166ac9fe7SDavid Sterba if (!fs_info) 39266ac9fe7SDavid Sterba return -EPERM; 39366ac9fe7SDavid Sterba 394bc98a42cSDavid Howells if (sb_rdonly(fs_info->sb)) 39579aec2b8SAnand Jain return -EROFS; 39679aec2b8SAnand Jain 39748fcc3ffSSatoru Takeuchi /* 39848fcc3ffSSatoru Takeuchi * p_len is the len until the first occurrence of either 39948fcc3ffSSatoru Takeuchi * '\n' or '\0' 40048fcc3ffSSatoru Takeuchi */ 40148fcc3ffSSatoru Takeuchi p_len = strcspn(buf, "\n"); 40248fcc3ffSSatoru Takeuchi 40348fcc3ffSSatoru Takeuchi if (p_len >= BTRFS_LABEL_SIZE) 404f8ba9c11SJeff Mahoney return -EINVAL; 405f8ba9c11SJeff Mahoney 406a6f69dc8SDavid Sterba spin_lock(&fs_info->super_lock); 40748fcc3ffSSatoru Takeuchi memset(fs_info->super_copy->label, 0, BTRFS_LABEL_SIZE); 40848fcc3ffSSatoru Takeuchi memcpy(fs_info->super_copy->label, buf, p_len); 409a6f69dc8SDavid Sterba spin_unlock(&fs_info->super_lock); 410f8ba9c11SJeff Mahoney 411a6f69dc8SDavid Sterba /* 412a6f69dc8SDavid Sterba * We don't want to do full transaction commit from inside sysfs 413a6f69dc8SDavid Sterba */ 414a6f69dc8SDavid Sterba btrfs_set_pending(fs_info, COMMIT); 415a6f69dc8SDavid Sterba wake_up_process(fs_info->transaction_kthread); 416a6f69dc8SDavid Sterba 417f8ba9c11SJeff Mahoney return len; 418f8ba9c11SJeff Mahoney } 419a969f4ccSHans van Kranenburg BTRFS_ATTR_RW(, label, btrfs_label_show, btrfs_label_store); 420f8ba9c11SJeff Mahoney 421df93589aSDavid Sterba static ssize_t btrfs_nodesize_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 426093e037cSDavid Sterba return snprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->nodesize); 427df93589aSDavid Sterba } 428df93589aSDavid Sterba 429a969f4ccSHans van Kranenburg BTRFS_ATTR(, nodesize, btrfs_nodesize_show); 430df93589aSDavid Sterba 431df93589aSDavid Sterba static ssize_t btrfs_sectorsize_show(struct kobject *kobj, 432df93589aSDavid Sterba struct kobj_attribute *a, char *buf) 433df93589aSDavid Sterba { 434df93589aSDavid Sterba struct btrfs_fs_info *fs_info = to_fs_info(kobj); 435df93589aSDavid Sterba 436093e037cSDavid Sterba return snprintf(buf, PAGE_SIZE, "%u\n", 437093e037cSDavid Sterba fs_info->super_copy->sectorsize); 438df93589aSDavid Sterba } 439df93589aSDavid Sterba 440a969f4ccSHans van Kranenburg BTRFS_ATTR(, sectorsize, btrfs_sectorsize_show); 441df93589aSDavid Sterba 442df93589aSDavid Sterba static ssize_t btrfs_clone_alignment_show(struct kobject *kobj, 443df93589aSDavid Sterba struct kobj_attribute *a, char *buf) 444df93589aSDavid Sterba { 445df93589aSDavid Sterba struct btrfs_fs_info *fs_info = to_fs_info(kobj); 446df93589aSDavid Sterba 447093e037cSDavid Sterba return snprintf(buf, PAGE_SIZE, "%u\n", 448093e037cSDavid Sterba fs_info->super_copy->sectorsize); 449df93589aSDavid Sterba } 450df93589aSDavid Sterba 451a969f4ccSHans van Kranenburg BTRFS_ATTR(, clone_alignment, btrfs_clone_alignment_show); 452df93589aSDavid Sterba 4532723480aSSargun Dhillon static ssize_t quota_override_show(struct kobject *kobj, 4542723480aSSargun Dhillon struct kobj_attribute *a, char *buf) 4552723480aSSargun Dhillon { 4562723480aSSargun Dhillon struct btrfs_fs_info *fs_info = to_fs_info(kobj); 4572723480aSSargun Dhillon int quota_override; 4582723480aSSargun Dhillon 4592723480aSSargun Dhillon quota_override = test_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags); 4602723480aSSargun Dhillon return snprintf(buf, PAGE_SIZE, "%d\n", quota_override); 4612723480aSSargun Dhillon } 4622723480aSSargun Dhillon 4632723480aSSargun Dhillon static ssize_t quota_override_store(struct kobject *kobj, 4642723480aSSargun Dhillon struct kobj_attribute *a, 4652723480aSSargun Dhillon const char *buf, size_t len) 4662723480aSSargun Dhillon { 4672723480aSSargun Dhillon struct btrfs_fs_info *fs_info = to_fs_info(kobj); 4682723480aSSargun Dhillon unsigned long knob; 4692723480aSSargun Dhillon int err; 4702723480aSSargun Dhillon 4712723480aSSargun Dhillon if (!fs_info) 4722723480aSSargun Dhillon return -EPERM; 4732723480aSSargun Dhillon 4742723480aSSargun Dhillon if (!capable(CAP_SYS_RESOURCE)) 4752723480aSSargun Dhillon return -EPERM; 4762723480aSSargun Dhillon 4772723480aSSargun Dhillon err = kstrtoul(buf, 10, &knob); 4782723480aSSargun Dhillon if (err) 4792723480aSSargun Dhillon return err; 4802723480aSSargun Dhillon if (knob > 1) 4812723480aSSargun Dhillon return -EINVAL; 4822723480aSSargun Dhillon 4832723480aSSargun Dhillon if (knob) 4842723480aSSargun Dhillon set_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags); 4852723480aSSargun Dhillon else 4862723480aSSargun Dhillon clear_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags); 4872723480aSSargun Dhillon 4882723480aSSargun Dhillon return len; 4892723480aSSargun Dhillon } 4902723480aSSargun Dhillon 491a969f4ccSHans van Kranenburg BTRFS_ATTR_RW(, quota_override, quota_override_show, quota_override_store); 4922723480aSSargun Dhillon 4930dd2906fSAnand Jain static const struct attribute *btrfs_attrs[] = { 494a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(, label), 495a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(, nodesize), 496a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(, sectorsize), 497a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(, clone_alignment), 498a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(, quota_override), 499f8ba9c11SJeff Mahoney NULL, 500f8ba9c11SJeff Mahoney }; 501f8ba9c11SJeff Mahoney 502c1b7e474SAnand Jain static void btrfs_release_fsid_kobj(struct kobject *kobj) 503510d7360SJeff Mahoney { 5042e7910d6SAnand Jain struct btrfs_fs_devices *fs_devs = to_fs_devs(kobj); 505248d200dSAnand Jain 506c1b7e474SAnand Jain memset(&fs_devs->fsid_kobj, 0, sizeof(struct kobject)); 5072e7910d6SAnand Jain complete(&fs_devs->kobj_unregister); 508510d7360SJeff Mahoney } 509510d7360SJeff Mahoney 510510d7360SJeff Mahoney static struct kobj_type btrfs_ktype = { 511510d7360SJeff Mahoney .sysfs_ops = &kobj_sysfs_ops, 512c1b7e474SAnand Jain .release = btrfs_release_fsid_kobj, 513510d7360SJeff Mahoney }; 514510d7360SJeff Mahoney 5152e7910d6SAnand Jain static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj) 5162e7910d6SAnand Jain { 5172e7910d6SAnand Jain if (kobj->ktype != &btrfs_ktype) 5182e7910d6SAnand Jain return NULL; 519c1b7e474SAnand Jain return container_of(kobj, struct btrfs_fs_devices, fsid_kobj); 5202e7910d6SAnand Jain } 5212e7910d6SAnand Jain 522510d7360SJeff Mahoney static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj) 523510d7360SJeff Mahoney { 524510d7360SJeff Mahoney if (kobj->ktype != &btrfs_ktype) 525510d7360SJeff Mahoney return NULL; 5262e7910d6SAnand Jain return to_fs_devs(kobj)->fs_info; 527510d7360SJeff Mahoney } 52858176a96SJosef Bacik 529e453d989SJeff Mahoney #define NUM_FEATURE_BITS 64 530e453d989SJeff Mahoney static char btrfs_unknown_feature_names[3][NUM_FEATURE_BITS][13]; 531e453d989SJeff Mahoney static struct btrfs_feature_attr btrfs_feature_attrs[3][NUM_FEATURE_BITS]; 532e453d989SJeff Mahoney 533e8c9f186SDavid Sterba static const u64 supported_feature_masks[3] = { 534e453d989SJeff Mahoney [FEAT_COMPAT] = BTRFS_FEATURE_COMPAT_SUPP, 535e453d989SJeff Mahoney [FEAT_COMPAT_RO] = BTRFS_FEATURE_COMPAT_RO_SUPP, 536e453d989SJeff Mahoney [FEAT_INCOMPAT] = BTRFS_FEATURE_INCOMPAT_SUPP, 537e453d989SJeff Mahoney }; 538e453d989SJeff Mahoney 539e453d989SJeff Mahoney static int addrm_unknown_feature_attrs(struct btrfs_fs_info *fs_info, bool add) 5405ac1d209SJeff Mahoney { 541e453d989SJeff Mahoney int set; 542e453d989SJeff Mahoney 543e453d989SJeff Mahoney for (set = 0; set < FEAT_MAX; set++) { 544e453d989SJeff Mahoney int i; 545e453d989SJeff Mahoney struct attribute *attrs[2]; 546e453d989SJeff Mahoney struct attribute_group agroup = { 547e453d989SJeff Mahoney .name = "features", 548e453d989SJeff Mahoney .attrs = attrs, 549e453d989SJeff Mahoney }; 550e453d989SJeff Mahoney u64 features = get_features(fs_info, set); 551e453d989SJeff Mahoney features &= ~supported_feature_masks[set]; 552e453d989SJeff Mahoney 553e453d989SJeff Mahoney if (!features) 554e453d989SJeff Mahoney continue; 555e453d989SJeff Mahoney 556e453d989SJeff Mahoney attrs[1] = NULL; 557e453d989SJeff Mahoney for (i = 0; i < NUM_FEATURE_BITS; i++) { 558e453d989SJeff Mahoney struct btrfs_feature_attr *fa; 559e453d989SJeff Mahoney 560e453d989SJeff Mahoney if (!(features & (1ULL << i))) 561e453d989SJeff Mahoney continue; 562e453d989SJeff Mahoney 563e453d989SJeff Mahoney fa = &btrfs_feature_attrs[set][i]; 564e453d989SJeff Mahoney attrs[0] = &fa->kobj_attr.attr; 565e453d989SJeff Mahoney if (add) { 566e453d989SJeff Mahoney int ret; 567c1b7e474SAnand Jain ret = sysfs_merge_group(&fs_info->fs_devices->fsid_kobj, 568e453d989SJeff Mahoney &agroup); 569e453d989SJeff Mahoney if (ret) 570e453d989SJeff Mahoney return ret; 571e453d989SJeff Mahoney } else 572c1b7e474SAnand Jain sysfs_unmerge_group(&fs_info->fs_devices->fsid_kobj, 573e453d989SJeff Mahoney &agroup); 574e453d989SJeff Mahoney } 575e453d989SJeff Mahoney 576e453d989SJeff Mahoney } 577e453d989SJeff Mahoney return 0; 578e453d989SJeff Mahoney } 579e453d989SJeff Mahoney 5802e3e1281SAnand Jain static void __btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs) 581e453d989SJeff Mahoney { 5822e7910d6SAnand Jain if (fs_devs->device_dir_kobj) { 5832e7910d6SAnand Jain kobject_del(fs_devs->device_dir_kobj); 5842e7910d6SAnand Jain kobject_put(fs_devs->device_dir_kobj); 5852e7910d6SAnand Jain fs_devs->device_dir_kobj = NULL; 586aaf13305SAnand Jain } 587aaf13305SAnand Jain 588c1b7e474SAnand Jain if (fs_devs->fsid_kobj.state_initialized) { 589c1b7e474SAnand Jain kobject_del(&fs_devs->fsid_kobj); 590c1b7e474SAnand Jain kobject_put(&fs_devs->fsid_kobj); 5912e7910d6SAnand Jain wait_for_completion(&fs_devs->kobj_unregister); 5925ac1d209SJeff Mahoney } 593f90fc547SAnand Jain } 5945ac1d209SJeff Mahoney 5952e3e1281SAnand Jain /* when fs_devs is NULL it will remove all fsid kobject */ 5961d1c1be3SAnand Jain void btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs) 5972e3e1281SAnand Jain { 5982e3e1281SAnand Jain struct list_head *fs_uuids = btrfs_get_fs_uuids(); 5992e3e1281SAnand Jain 6002e3e1281SAnand Jain if (fs_devs) { 6012e3e1281SAnand Jain __btrfs_sysfs_remove_fsid(fs_devs); 6022e3e1281SAnand Jain return; 6032e3e1281SAnand Jain } 6042e3e1281SAnand Jain 6052e3e1281SAnand Jain list_for_each_entry(fs_devs, fs_uuids, list) { 6062e3e1281SAnand Jain __btrfs_sysfs_remove_fsid(fs_devs); 6072e3e1281SAnand Jain } 6082e3e1281SAnand Jain } 6092e3e1281SAnand Jain 6106618a59bSAnand Jain void btrfs_sysfs_remove_mounted(struct btrfs_fs_info *fs_info) 611e453d989SJeff Mahoney { 6125a13f430SAnand Jain btrfs_reset_fs_info_ptr(fs_info); 6135a13f430SAnand Jain 614e453d989SJeff Mahoney if (fs_info->space_info_kobj) { 615e453d989SJeff Mahoney sysfs_remove_files(fs_info->space_info_kobj, allocation_attrs); 616e453d989SJeff Mahoney kobject_del(fs_info->space_info_kobj); 617e453d989SJeff Mahoney kobject_put(fs_info->space_info_kobj); 618e453d989SJeff Mahoney } 619e453d989SJeff Mahoney addrm_unknown_feature_attrs(fs_info, false); 620c1b7e474SAnand Jain sysfs_remove_group(&fs_info->fs_devices->fsid_kobj, &btrfs_feature_attr_group); 621c1b7e474SAnand Jain sysfs_remove_files(&fs_info->fs_devices->fsid_kobj, btrfs_attrs); 62232576040SAnand Jain btrfs_sysfs_rm_device_link(fs_info->fs_devices, NULL); 623e453d989SJeff Mahoney } 624e453d989SJeff Mahoney 62579da4fa4SJeff Mahoney const char * const btrfs_feature_set_names[3] = { 62679da4fa4SJeff Mahoney [FEAT_COMPAT] = "compat", 62779da4fa4SJeff Mahoney [FEAT_COMPAT_RO] = "compat_ro", 62879da4fa4SJeff Mahoney [FEAT_INCOMPAT] = "incompat", 62979da4fa4SJeff Mahoney }; 63079da4fa4SJeff Mahoney 6313b02a68aSJeff Mahoney char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags) 6323b02a68aSJeff Mahoney { 6333b02a68aSJeff Mahoney size_t bufsize = 4096; /* safe max, 64 names * 64 bytes */ 6343b02a68aSJeff Mahoney int len = 0; 6353b02a68aSJeff Mahoney int i; 6363b02a68aSJeff Mahoney char *str; 6373b02a68aSJeff Mahoney 6383b02a68aSJeff Mahoney str = kmalloc(bufsize, GFP_KERNEL); 6393b02a68aSJeff Mahoney if (!str) 6403b02a68aSJeff Mahoney return str; 6413b02a68aSJeff Mahoney 6423b02a68aSJeff Mahoney for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { 6433b02a68aSJeff Mahoney const char *name; 6443b02a68aSJeff Mahoney 6453b02a68aSJeff Mahoney if (!(flags & (1ULL << i))) 6463b02a68aSJeff Mahoney continue; 6473b02a68aSJeff Mahoney 6483b02a68aSJeff Mahoney name = btrfs_feature_attrs[set][i].kobj_attr.attr.name; 6493b02a68aSJeff Mahoney len += snprintf(str + len, bufsize - len, "%s%s", 6503b02a68aSJeff Mahoney len ? "," : "", name); 6513b02a68aSJeff Mahoney } 6523b02a68aSJeff Mahoney 6533b02a68aSJeff Mahoney return str; 6543b02a68aSJeff Mahoney } 6553b02a68aSJeff Mahoney 65679da4fa4SJeff Mahoney static void init_feature_attrs(void) 65779da4fa4SJeff Mahoney { 65879da4fa4SJeff Mahoney struct btrfs_feature_attr *fa; 65979da4fa4SJeff Mahoney int set, i; 66079da4fa4SJeff Mahoney 66179da4fa4SJeff Mahoney BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names) != 66279da4fa4SJeff Mahoney ARRAY_SIZE(btrfs_feature_attrs)); 66379da4fa4SJeff Mahoney BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names[0]) != 66479da4fa4SJeff Mahoney ARRAY_SIZE(btrfs_feature_attrs[0])); 66579da4fa4SJeff Mahoney 6663b02a68aSJeff Mahoney memset(btrfs_feature_attrs, 0, sizeof(btrfs_feature_attrs)); 6673b02a68aSJeff Mahoney memset(btrfs_unknown_feature_names, 0, 6683b02a68aSJeff Mahoney sizeof(btrfs_unknown_feature_names)); 6693b02a68aSJeff Mahoney 67079da4fa4SJeff Mahoney for (i = 0; btrfs_supported_feature_attrs[i]; i++) { 67179da4fa4SJeff Mahoney struct btrfs_feature_attr *sfa; 67279da4fa4SJeff Mahoney struct attribute *a = btrfs_supported_feature_attrs[i]; 6733b02a68aSJeff Mahoney int bit; 67479da4fa4SJeff Mahoney sfa = attr_to_btrfs_feature_attr(a); 6753b02a68aSJeff Mahoney bit = ilog2(sfa->feature_bit); 6763b02a68aSJeff Mahoney fa = &btrfs_feature_attrs[sfa->feature_set][bit]; 67779da4fa4SJeff Mahoney 67879da4fa4SJeff Mahoney fa->kobj_attr.attr.name = sfa->kobj_attr.attr.name; 67979da4fa4SJeff Mahoney } 68079da4fa4SJeff Mahoney 68179da4fa4SJeff Mahoney for (set = 0; set < FEAT_MAX; set++) { 68279da4fa4SJeff Mahoney for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { 68379da4fa4SJeff Mahoney char *name = btrfs_unknown_feature_names[set][i]; 68479da4fa4SJeff Mahoney fa = &btrfs_feature_attrs[set][i]; 68579da4fa4SJeff Mahoney 68679da4fa4SJeff Mahoney if (fa->kobj_attr.attr.name) 68779da4fa4SJeff Mahoney continue; 68879da4fa4SJeff Mahoney 68979da4fa4SJeff Mahoney snprintf(name, 13, "%s:%u", 69079da4fa4SJeff Mahoney btrfs_feature_set_names[set], i); 69179da4fa4SJeff Mahoney 69279da4fa4SJeff Mahoney fa->kobj_attr.attr.name = name; 69379da4fa4SJeff Mahoney fa->kobj_attr.attr.mode = S_IRUGO; 69479da4fa4SJeff Mahoney fa->feature_set = set; 69579da4fa4SJeff Mahoney fa->feature_bit = 1ULL << i; 69679da4fa4SJeff Mahoney } 69779da4fa4SJeff Mahoney } 69879da4fa4SJeff Mahoney } 69979da4fa4SJeff Mahoney 700e7e1aa9cSAnand Jain /* when one_device is NULL, it removes all device links */ 701e7e1aa9cSAnand Jain 70232576040SAnand Jain int btrfs_sysfs_rm_device_link(struct btrfs_fs_devices *fs_devices, 70399994cdeSAnand Jain struct btrfs_device *one_device) 70499994cdeSAnand Jain { 70599994cdeSAnand Jain struct hd_struct *disk; 70699994cdeSAnand Jain struct kobject *disk_kobj; 70799994cdeSAnand Jain 7086c14a164SAnand Jain if (!fs_devices->device_dir_kobj) 70999994cdeSAnand Jain return -EINVAL; 71099994cdeSAnand Jain 71187fa3bb0SLiu Bo if (one_device && one_device->bdev) { 71299994cdeSAnand Jain disk = one_device->bdev->bd_part; 71399994cdeSAnand Jain disk_kobj = &part_to_dev(disk)->kobj; 71499994cdeSAnand Jain 7156c14a164SAnand Jain sysfs_remove_link(fs_devices->device_dir_kobj, 71699994cdeSAnand Jain disk_kobj->name); 71799994cdeSAnand Jain } 71899994cdeSAnand Jain 719e7e1aa9cSAnand Jain if (one_device) 720e7e1aa9cSAnand Jain return 0; 721e7e1aa9cSAnand Jain 722e7e1aa9cSAnand Jain list_for_each_entry(one_device, 7236c14a164SAnand Jain &fs_devices->devices, dev_list) { 724e7e1aa9cSAnand Jain if (!one_device->bdev) 725e7e1aa9cSAnand Jain continue; 726e7e1aa9cSAnand Jain disk = one_device->bdev->bd_part; 727e7e1aa9cSAnand Jain disk_kobj = &part_to_dev(disk)->kobj; 728e7e1aa9cSAnand Jain 7296c14a164SAnand Jain sysfs_remove_link(fs_devices->device_dir_kobj, 730e7e1aa9cSAnand Jain disk_kobj->name); 731e7e1aa9cSAnand Jain } 732e7e1aa9cSAnand Jain 73399994cdeSAnand Jain return 0; 73499994cdeSAnand Jain } 73599994cdeSAnand Jain 7362e7910d6SAnand Jain int btrfs_sysfs_add_device(struct btrfs_fs_devices *fs_devs) 73700c921c2SAnand Jain { 7382e7910d6SAnand Jain if (!fs_devs->device_dir_kobj) 7392e7910d6SAnand Jain fs_devs->device_dir_kobj = kobject_create_and_add("devices", 740c1b7e474SAnand Jain &fs_devs->fsid_kobj); 74100c921c2SAnand Jain 7422e7910d6SAnand Jain if (!fs_devs->device_dir_kobj) 74300c921c2SAnand Jain return -ENOMEM; 74400c921c2SAnand Jain 74500c921c2SAnand Jain return 0; 74600c921c2SAnand Jain } 74700c921c2SAnand Jain 748e3bd6973SAnand Jain int btrfs_sysfs_add_device_link(struct btrfs_fs_devices *fs_devices, 7490d39376aSAnand Jain struct btrfs_device *one_device) 75029e5be24SJeff Mahoney { 75129e5be24SJeff Mahoney int error = 0; 75229e5be24SJeff Mahoney struct btrfs_device *dev; 75329e5be24SJeff Mahoney 75429e5be24SJeff Mahoney list_for_each_entry(dev, &fs_devices->devices, dev_list) { 755f085381eSAnand Jain struct hd_struct *disk; 756f085381eSAnand Jain struct kobject *disk_kobj; 757f085381eSAnand Jain 758f085381eSAnand Jain if (!dev->bdev) 759f085381eSAnand Jain continue; 760f085381eSAnand Jain 7610d39376aSAnand Jain if (one_device && one_device != dev) 7620d39376aSAnand Jain continue; 7630d39376aSAnand Jain 764f085381eSAnand Jain disk = dev->bdev->bd_part; 765f085381eSAnand Jain disk_kobj = &part_to_dev(disk)->kobj; 76629e5be24SJeff Mahoney 7672e7910d6SAnand Jain error = sysfs_create_link(fs_devices->device_dir_kobj, 76829e5be24SJeff Mahoney disk_kobj, disk_kobj->name); 76929e5be24SJeff Mahoney if (error) 77029e5be24SJeff Mahoney break; 77129e5be24SJeff Mahoney } 77229e5be24SJeff Mahoney 77329e5be24SJeff Mahoney return error; 77429e5be24SJeff Mahoney } 77529e5be24SJeff Mahoney 776510d7360SJeff Mahoney /* /sys/fs/btrfs/ entry */ 777510d7360SJeff Mahoney static struct kset *btrfs_kset; 778510d7360SJeff Mahoney 7791bae3098SDavid Sterba /* /sys/kernel/debug/btrfs */ 7801bae3098SDavid Sterba static struct dentry *btrfs_debugfs_root_dentry; 7811bae3098SDavid Sterba 7821bae3098SDavid Sterba /* Debugging tunables and exported data */ 7831bae3098SDavid Sterba u64 btrfs_debugfs_test; 7841bae3098SDavid Sterba 78572059215SAnand Jain /* 78672059215SAnand Jain * Can be called by the device discovery thread. 78772059215SAnand Jain * And parent can be specified for seed device 78872059215SAnand Jain */ 7890c10e2d4SAnand Jain int btrfs_sysfs_add_fsid(struct btrfs_fs_devices *fs_devs, 79072059215SAnand Jain struct kobject *parent) 7915ac1d209SJeff Mahoney { 7925ac1d209SJeff Mahoney int error; 7935ac1d209SJeff Mahoney 7942e7910d6SAnand Jain init_completion(&fs_devs->kobj_unregister); 795c1b7e474SAnand Jain fs_devs->fsid_kobj.kset = btrfs_kset; 796c1b7e474SAnand Jain error = kobject_init_and_add(&fs_devs->fsid_kobj, 79724bd69cbSAnand Jain &btrfs_ktype, parent, "%pU", fs_devs->fsid); 79872059215SAnand Jain return error; 79972059215SAnand Jain } 80072059215SAnand Jain 80196f3136eSAnand Jain int btrfs_sysfs_add_mounted(struct btrfs_fs_info *fs_info) 80272059215SAnand Jain { 80372059215SAnand Jain int error; 8042e7910d6SAnand Jain struct btrfs_fs_devices *fs_devs = fs_info->fs_devices; 805c1b7e474SAnand Jain struct kobject *fsid_kobj = &fs_devs->fsid_kobj; 80672059215SAnand Jain 8075a13f430SAnand Jain btrfs_set_fs_info_ptr(fs_info); 8085a13f430SAnand Jain 809e3bd6973SAnand Jain error = btrfs_sysfs_add_device_link(fs_devs, NULL); 810e453d989SJeff Mahoney if (error) 811e453d989SJeff Mahoney return error; 812510d7360SJeff Mahoney 813c1b7e474SAnand Jain error = sysfs_create_files(fsid_kobj, btrfs_attrs); 814e453d989SJeff Mahoney if (error) { 81532576040SAnand Jain btrfs_sysfs_rm_device_link(fs_devs, NULL); 816e453d989SJeff Mahoney return error; 817e453d989SJeff Mahoney } 81879da4fa4SJeff Mahoney 819c1b7e474SAnand Jain error = sysfs_create_group(fsid_kobj, 8200dd2906fSAnand Jain &btrfs_feature_attr_group); 8210dd2906fSAnand Jain if (error) 8220dd2906fSAnand Jain goto failure; 8230dd2906fSAnand Jain 824e453d989SJeff Mahoney error = addrm_unknown_feature_attrs(fs_info, true); 82579da4fa4SJeff Mahoney if (error) 82679da4fa4SJeff Mahoney goto failure; 82779da4fa4SJeff Mahoney 8286ab0a202SJeff Mahoney fs_info->space_info_kobj = kobject_create_and_add("allocation", 829c1b7e474SAnand Jain fsid_kobj); 8306ab0a202SJeff Mahoney if (!fs_info->space_info_kobj) { 8316ab0a202SJeff Mahoney error = -ENOMEM; 8326ab0a202SJeff Mahoney goto failure; 8336ab0a202SJeff Mahoney } 8346ab0a202SJeff Mahoney 8356ab0a202SJeff Mahoney error = sysfs_create_files(fs_info->space_info_kobj, allocation_attrs); 8366ab0a202SJeff Mahoney if (error) 8376ab0a202SJeff Mahoney goto failure; 8386ab0a202SJeff Mahoney 83979da4fa4SJeff Mahoney return 0; 84079da4fa4SJeff Mahoney failure: 8416618a59bSAnand Jain btrfs_sysfs_remove_mounted(fs_info); 8425ac1d209SJeff Mahoney return error; 8435ac1d209SJeff Mahoney } 8445ac1d209SJeff Mahoney 845444e7516SDavid Sterba 846444e7516SDavid Sterba /* 847444e7516SDavid Sterba * Change per-fs features in /sys/fs/btrfs/UUID/features to match current 848444e7516SDavid Sterba * values in superblock. Call after any changes to incompat/compat_ro flags 849444e7516SDavid Sterba */ 850444e7516SDavid Sterba void btrfs_sysfs_feature_update(struct btrfs_fs_info *fs_info, 851444e7516SDavid Sterba u64 bit, enum btrfs_feature_set set) 852444e7516SDavid Sterba { 853444e7516SDavid Sterba struct btrfs_fs_devices *fs_devs; 854444e7516SDavid Sterba struct kobject *fsid_kobj; 855444e7516SDavid Sterba u64 features; 856444e7516SDavid Sterba int ret; 857444e7516SDavid Sterba 858444e7516SDavid Sterba if (!fs_info) 859444e7516SDavid Sterba return; 860444e7516SDavid Sterba 861444e7516SDavid Sterba features = get_features(fs_info, set); 862444e7516SDavid Sterba ASSERT(bit & supported_feature_masks[set]); 863444e7516SDavid Sterba 864444e7516SDavid Sterba fs_devs = fs_info->fs_devices; 865444e7516SDavid Sterba fsid_kobj = &fs_devs->fsid_kobj; 866444e7516SDavid Sterba 867bf609206SDavid Sterba if (!fsid_kobj->state_initialized) 868bf609206SDavid Sterba return; 869bf609206SDavid Sterba 870444e7516SDavid Sterba /* 871444e7516SDavid Sterba * FIXME: this is too heavy to update just one value, ideally we'd like 872444e7516SDavid Sterba * to use sysfs_update_group but some refactoring is needed first. 873444e7516SDavid Sterba */ 874444e7516SDavid Sterba sysfs_remove_group(fsid_kobj, &btrfs_feature_attr_group); 875444e7516SDavid Sterba ret = sysfs_create_group(fsid_kobj, &btrfs_feature_attr_group); 876444e7516SDavid Sterba } 877444e7516SDavid Sterba 8781bae3098SDavid Sterba static int btrfs_init_debugfs(void) 8791bae3098SDavid Sterba { 8801bae3098SDavid Sterba #ifdef CONFIG_DEBUG_FS 8811bae3098SDavid Sterba btrfs_debugfs_root_dentry = debugfs_create_dir("btrfs", NULL); 8821bae3098SDavid Sterba if (!btrfs_debugfs_root_dentry) 8831bae3098SDavid Sterba return -ENOMEM; 8841bae3098SDavid Sterba 885b0de6c4cSDavid Sterba /* 886b0de6c4cSDavid Sterba * Example code, how to export data through debugfs. 887b0de6c4cSDavid Sterba * 888b0de6c4cSDavid Sterba * file: /sys/kernel/debug/btrfs/test 889b0de6c4cSDavid Sterba * contents of: btrfs_debugfs_test 890b0de6c4cSDavid Sterba */ 891b0de6c4cSDavid Sterba #ifdef CONFIG_BTRFS_DEBUG 89207f6a480SEric Sandeen debugfs_create_u64("test", S_IRUGO | S_IWUSR, btrfs_debugfs_root_dentry, 8931bae3098SDavid Sterba &btrfs_debugfs_test); 8941bae3098SDavid Sterba #endif 895b0de6c4cSDavid Sterba 896b0de6c4cSDavid Sterba #endif 8971bae3098SDavid Sterba return 0; 8981bae3098SDavid Sterba } 8991bae3098SDavid Sterba 900f5c29bd9SLiu Bo int __init btrfs_init_sysfs(void) 90158176a96SJosef Bacik { 902079b72bcSJeff Mahoney int ret; 9031bae3098SDavid Sterba 904e3fe4e71SGreg KH btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj); 905e3fe4e71SGreg KH if (!btrfs_kset) 906e3fe4e71SGreg KH return -ENOMEM; 907079b72bcSJeff Mahoney 9081bae3098SDavid Sterba ret = btrfs_init_debugfs(); 9091bae3098SDavid Sterba if (ret) 910001a648dSFilipe Manana goto out1; 911079b72bcSJeff Mahoney 9121bae3098SDavid Sterba init_feature_attrs(); 9131bae3098SDavid Sterba ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); 914001a648dSFilipe Manana if (ret) 915001a648dSFilipe Manana goto out2; 916001a648dSFilipe Manana 917001a648dSFilipe Manana return 0; 918001a648dSFilipe Manana out2: 919001a648dSFilipe Manana debugfs_remove_recursive(btrfs_debugfs_root_dentry); 920001a648dSFilipe Manana out1: 921001a648dSFilipe Manana kset_unregister(btrfs_kset); 9221bae3098SDavid Sterba 9231bae3098SDavid Sterba return ret; 92458176a96SJosef Bacik } 92558176a96SJosef Bacik 926e67c718bSDavid Sterba void __cold btrfs_exit_sysfs(void) 92758176a96SJosef Bacik { 928079b72bcSJeff Mahoney sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); 929e3fe4e71SGreg KH kset_unregister(btrfs_kset); 9301bae3098SDavid Sterba debugfs_remove_recursive(btrfs_debugfs_root_dentry); 93158176a96SJosef Bacik } 93255d47414SChris Mason 933