1c1d7c514SDavid Sterba // SPDX-License-Identifier: GPL-2.0 26cbd5570SChris Mason /* 36cbd5570SChris Mason * Copyright (C) 2007 Oracle. All rights reserved. 46cbd5570SChris Mason */ 56cbd5570SChris Mason 658176a96SJosef Bacik #include <linux/sched.h> 758176a96SJosef Bacik #include <linux/slab.h> 858176a96SJosef Bacik #include <linux/spinlock.h> 958176a96SJosef Bacik #include <linux/completion.h> 1058176a96SJosef Bacik #include <linux/buffer_head.h> 1158176a96SJosef Bacik #include <linux/kobject.h> 1279da4fa4SJeff Mahoney #include <linux/bug.h> 1329e5be24SJeff Mahoney #include <linux/genhd.h> 141bae3098SDavid Sterba #include <linux/debugfs.h> 1558176a96SJosef Bacik 16bae45de0SChris Mason #include "ctree.h" 17bae45de0SChris Mason #include "disk-io.h" 18bae45de0SChris Mason #include "transaction.h" 19079b72bcSJeff Mahoney #include "sysfs.h" 2029e5be24SJeff Mahoney #include "volumes.h" 21079b72bcSJeff Mahoney 22510d7360SJeff Mahoney static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj); 232e7910d6SAnand Jain static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj); 245ac1d209SJeff Mahoney 25510d7360SJeff Mahoney static u64 get_features(struct btrfs_fs_info *fs_info, 26510d7360SJeff Mahoney enum btrfs_feature_set set) 275ac1d209SJeff Mahoney { 28510d7360SJeff Mahoney struct btrfs_super_block *disk_super = fs_info->super_copy; 29510d7360SJeff Mahoney if (set == FEAT_COMPAT) 30510d7360SJeff Mahoney return btrfs_super_compat_flags(disk_super); 31510d7360SJeff Mahoney else if (set == FEAT_COMPAT_RO) 32510d7360SJeff Mahoney return btrfs_super_compat_ro_flags(disk_super); 33510d7360SJeff Mahoney else 34510d7360SJeff Mahoney return btrfs_super_incompat_flags(disk_super); 355ac1d209SJeff Mahoney } 365ac1d209SJeff Mahoney 37ba631941SJeff Mahoney static void set_features(struct btrfs_fs_info *fs_info, 38ba631941SJeff Mahoney enum btrfs_feature_set set, u64 features) 39ba631941SJeff Mahoney { 40ba631941SJeff Mahoney struct btrfs_super_block *disk_super = fs_info->super_copy; 41ba631941SJeff Mahoney if (set == FEAT_COMPAT) 42ba631941SJeff Mahoney btrfs_set_super_compat_flags(disk_super, features); 43ba631941SJeff Mahoney else if (set == FEAT_COMPAT_RO) 44ba631941SJeff Mahoney btrfs_set_super_compat_ro_flags(disk_super, features); 45ba631941SJeff Mahoney else 46ba631941SJeff Mahoney btrfs_set_super_incompat_flags(disk_super, features); 47ba631941SJeff Mahoney } 48ba631941SJeff Mahoney 49ba631941SJeff Mahoney static int can_modify_feature(struct btrfs_feature_attr *fa) 50ba631941SJeff Mahoney { 51ba631941SJeff Mahoney int val = 0; 52ba631941SJeff Mahoney u64 set, clear; 53ba631941SJeff Mahoney switch (fa->feature_set) { 54ba631941SJeff Mahoney case FEAT_COMPAT: 55ba631941SJeff Mahoney set = BTRFS_FEATURE_COMPAT_SAFE_SET; 56ba631941SJeff Mahoney clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR; 57ba631941SJeff Mahoney break; 58ba631941SJeff Mahoney case FEAT_COMPAT_RO: 59ba631941SJeff Mahoney set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET; 60ba631941SJeff Mahoney clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR; 61ba631941SJeff Mahoney break; 62ba631941SJeff Mahoney case FEAT_INCOMPAT: 63ba631941SJeff Mahoney set = BTRFS_FEATURE_INCOMPAT_SAFE_SET; 64ba631941SJeff Mahoney clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR; 65ba631941SJeff Mahoney break; 66ba631941SJeff Mahoney default: 6762e85577SJeff Mahoney pr_warn("btrfs: sysfs: unknown feature set %d\n", 68cc37bb04SDavid Sterba fa->feature_set); 69cc37bb04SDavid Sterba return 0; 70ba631941SJeff Mahoney } 71ba631941SJeff Mahoney 72ba631941SJeff Mahoney if (set & fa->feature_bit) 73ba631941SJeff Mahoney val |= 1; 74ba631941SJeff Mahoney if (clear & fa->feature_bit) 75ba631941SJeff Mahoney val |= 2; 76ba631941SJeff Mahoney 77ba631941SJeff Mahoney return val; 78ba631941SJeff Mahoney } 79ba631941SJeff Mahoney 80079b72bcSJeff Mahoney static ssize_t btrfs_feature_attr_show(struct kobject *kobj, 81079b72bcSJeff Mahoney struct kobj_attribute *a, char *buf) 82079b72bcSJeff Mahoney { 83510d7360SJeff Mahoney int val = 0; 84510d7360SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj); 85510d7360SJeff Mahoney struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a); 86ba631941SJeff Mahoney if (fs_info) { 87510d7360SJeff Mahoney u64 features = get_features(fs_info, fa->feature_set); 88510d7360SJeff Mahoney if (features & fa->feature_bit) 89510d7360SJeff Mahoney val = 1; 90ba631941SJeff Mahoney } else 91ba631941SJeff Mahoney val = can_modify_feature(fa); 92510d7360SJeff Mahoney 93510d7360SJeff Mahoney return snprintf(buf, PAGE_SIZE, "%d\n", val); 94510d7360SJeff Mahoney } 95510d7360SJeff Mahoney 96ba631941SJeff Mahoney static ssize_t btrfs_feature_attr_store(struct kobject *kobj, 97ba631941SJeff Mahoney struct kobj_attribute *a, 98ba631941SJeff Mahoney const char *buf, size_t count) 99ba631941SJeff Mahoney { 100ba631941SJeff Mahoney struct btrfs_fs_info *fs_info; 101ba631941SJeff Mahoney struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a); 102ba631941SJeff Mahoney u64 features, set, clear; 103ba631941SJeff Mahoney unsigned long val; 104ba631941SJeff Mahoney int ret; 105ba631941SJeff Mahoney 106ba631941SJeff Mahoney fs_info = to_fs_info(kobj); 107ba631941SJeff Mahoney if (!fs_info) 108ba631941SJeff Mahoney return -EPERM; 109ba631941SJeff Mahoney 110bc98a42cSDavid Howells if (sb_rdonly(fs_info->sb)) 111ee611138SDavid Sterba return -EROFS; 112ee611138SDavid Sterba 113ba631941SJeff Mahoney ret = kstrtoul(skip_spaces(buf), 0, &val); 114ba631941SJeff Mahoney if (ret) 115ba631941SJeff Mahoney return ret; 116ba631941SJeff Mahoney 117ba631941SJeff Mahoney if (fa->feature_set == FEAT_COMPAT) { 118ba631941SJeff Mahoney set = BTRFS_FEATURE_COMPAT_SAFE_SET; 119ba631941SJeff Mahoney clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR; 120ba631941SJeff Mahoney } else if (fa->feature_set == FEAT_COMPAT_RO) { 121ba631941SJeff Mahoney set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET; 122ba631941SJeff Mahoney clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR; 123ba631941SJeff Mahoney } else { 124ba631941SJeff Mahoney set = BTRFS_FEATURE_INCOMPAT_SAFE_SET; 125ba631941SJeff Mahoney clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR; 126ba631941SJeff Mahoney } 127ba631941SJeff Mahoney 128ba631941SJeff Mahoney features = get_features(fs_info, fa->feature_set); 129ba631941SJeff Mahoney 130ba631941SJeff Mahoney /* Nothing to do */ 131ba631941SJeff Mahoney if ((val && (features & fa->feature_bit)) || 132ba631941SJeff Mahoney (!val && !(features & fa->feature_bit))) 133ba631941SJeff Mahoney return count; 134ba631941SJeff Mahoney 135ba631941SJeff Mahoney if ((val && !(set & fa->feature_bit)) || 136ba631941SJeff Mahoney (!val && !(clear & fa->feature_bit))) { 137ba631941SJeff Mahoney btrfs_info(fs_info, 138ba631941SJeff Mahoney "%sabling feature %s on mounted fs is not supported.", 139ba631941SJeff Mahoney val ? "En" : "Dis", fa->kobj_attr.attr.name); 140ba631941SJeff Mahoney return -EPERM; 141ba631941SJeff Mahoney } 142ba631941SJeff Mahoney 143ba631941SJeff Mahoney btrfs_info(fs_info, "%s %s feature flag", 144ba631941SJeff Mahoney val ? "Setting" : "Clearing", fa->kobj_attr.attr.name); 145ba631941SJeff Mahoney 146ba631941SJeff Mahoney spin_lock(&fs_info->super_lock); 147ba631941SJeff Mahoney features = get_features(fs_info, fa->feature_set); 148ba631941SJeff Mahoney if (val) 149ba631941SJeff Mahoney features |= fa->feature_bit; 150ba631941SJeff Mahoney else 151ba631941SJeff Mahoney features &= ~fa->feature_bit; 152ba631941SJeff Mahoney set_features(fs_info, fa->feature_set, features); 153ba631941SJeff Mahoney spin_unlock(&fs_info->super_lock); 154ba631941SJeff Mahoney 1550eae2747SDavid Sterba /* 1560eae2747SDavid Sterba * We don't want to do full transaction commit from inside sysfs 1570eae2747SDavid Sterba */ 1580eae2747SDavid Sterba btrfs_set_pending(fs_info, COMMIT); 1590eae2747SDavid Sterba wake_up_process(fs_info->transaction_kthread); 160ba631941SJeff Mahoney 161ba631941SJeff Mahoney return count; 162ba631941SJeff Mahoney } 163ba631941SJeff Mahoney 164510d7360SJeff Mahoney static umode_t btrfs_feature_visible(struct kobject *kobj, 165510d7360SJeff Mahoney struct attribute *attr, int unused) 166510d7360SJeff Mahoney { 167510d7360SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj); 168510d7360SJeff Mahoney umode_t mode = attr->mode; 169510d7360SJeff Mahoney 170510d7360SJeff Mahoney if (fs_info) { 171510d7360SJeff Mahoney struct btrfs_feature_attr *fa; 172510d7360SJeff Mahoney u64 features; 173510d7360SJeff Mahoney 174510d7360SJeff Mahoney fa = attr_to_btrfs_feature_attr(attr); 175510d7360SJeff Mahoney features = get_features(fs_info, fa->feature_set); 176510d7360SJeff Mahoney 177ba631941SJeff Mahoney if (can_modify_feature(fa)) 178ba631941SJeff Mahoney mode |= S_IWUSR; 179ba631941SJeff Mahoney else if (!(features & fa->feature_bit)) 180510d7360SJeff Mahoney mode = 0; 181510d7360SJeff Mahoney } 182510d7360SJeff Mahoney 183510d7360SJeff Mahoney return mode; 184079b72bcSJeff Mahoney } 185079b72bcSJeff Mahoney 186079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(mixed_backref, MIXED_BACKREF); 187079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(default_subvol, DEFAULT_SUBVOL); 188079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(mixed_groups, MIXED_GROUPS); 189079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(compress_lzo, COMPRESS_LZO); 1905c1aab1dSNick Terrell BTRFS_FEAT_ATTR_INCOMPAT(compress_zstd, COMPRESS_ZSTD); 191079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(big_metadata, BIG_METADATA); 192079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(extended_iref, EXTENDED_IREF); 193079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(raid56, RAID56); 194079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(skinny_metadata, SKINNY_METADATA); 195c736c095SDavid Sterba BTRFS_FEAT_ATTR_INCOMPAT(no_holes, NO_HOLES); 1963b5bb73bSDavid Sterba BTRFS_FEAT_ATTR_COMPAT_RO(free_space_tree, FREE_SPACE_TREE); 197079b72bcSJeff Mahoney 198079b72bcSJeff Mahoney static struct attribute *btrfs_supported_feature_attrs[] = { 199079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(mixed_backref), 200079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(default_subvol), 201079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(mixed_groups), 202079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(compress_lzo), 2035c1aab1dSNick Terrell BTRFS_FEAT_ATTR_PTR(compress_zstd), 204079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(big_metadata), 205079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(extended_iref), 206079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(raid56), 207079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(skinny_metadata), 208c736c095SDavid Sterba BTRFS_FEAT_ATTR_PTR(no_holes), 2093b5bb73bSDavid Sterba BTRFS_FEAT_ATTR_PTR(free_space_tree), 210079b72bcSJeff Mahoney NULL 211079b72bcSJeff Mahoney }; 212079b72bcSJeff Mahoney 213079b72bcSJeff Mahoney static const struct attribute_group btrfs_feature_attr_group = { 214079b72bcSJeff Mahoney .name = "features", 215510d7360SJeff Mahoney .is_visible = btrfs_feature_visible, 216079b72bcSJeff Mahoney .attrs = btrfs_supported_feature_attrs, 217079b72bcSJeff Mahoney }; 21858176a96SJosef Bacik 2196ab0a202SJeff Mahoney static ssize_t btrfs_show_u64(u64 *value_ptr, spinlock_t *lock, char *buf) 2206ab0a202SJeff Mahoney { 2216ab0a202SJeff Mahoney u64 val; 2226ab0a202SJeff Mahoney if (lock) 2236ab0a202SJeff Mahoney spin_lock(lock); 2246ab0a202SJeff Mahoney val = *value_ptr; 2256ab0a202SJeff Mahoney if (lock) 2266ab0a202SJeff Mahoney spin_unlock(lock); 2276ab0a202SJeff Mahoney return snprintf(buf, PAGE_SIZE, "%llu\n", val); 2286ab0a202SJeff Mahoney } 2296ab0a202SJeff Mahoney 2306ab0a202SJeff Mahoney static ssize_t global_rsv_size_show(struct kobject *kobj, 2316ab0a202SJeff Mahoney struct kobj_attribute *ka, char *buf) 2326ab0a202SJeff Mahoney { 2336ab0a202SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); 2346ab0a202SJeff Mahoney struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 2356ab0a202SJeff Mahoney return btrfs_show_u64(&block_rsv->size, &block_rsv->lock, buf); 2366ab0a202SJeff Mahoney } 237a969f4ccSHans van Kranenburg BTRFS_ATTR(allocation, global_rsv_size, global_rsv_size_show); 2386ab0a202SJeff Mahoney 2396ab0a202SJeff Mahoney static ssize_t global_rsv_reserved_show(struct kobject *kobj, 2406ab0a202SJeff Mahoney struct kobj_attribute *a, char *buf) 2416ab0a202SJeff Mahoney { 2426ab0a202SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); 2436ab0a202SJeff Mahoney struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 2446ab0a202SJeff Mahoney return btrfs_show_u64(&block_rsv->reserved, &block_rsv->lock, buf); 2456ab0a202SJeff Mahoney } 246a969f4ccSHans van Kranenburg BTRFS_ATTR(allocation, global_rsv_reserved, global_rsv_reserved_show); 2476ab0a202SJeff Mahoney 2486ab0a202SJeff Mahoney #define to_space_info(_kobj) container_of(_kobj, struct btrfs_space_info, kobj) 249c1895442SJeff Mahoney #define to_raid_kobj(_kobj) container_of(_kobj, struct raid_kobject, kobj) 2506ab0a202SJeff Mahoney 2516ab0a202SJeff Mahoney static ssize_t raid_bytes_show(struct kobject *kobj, 2526ab0a202SJeff Mahoney struct kobj_attribute *attr, char *buf); 253a969f4ccSHans van Kranenburg BTRFS_ATTR(raid, total_bytes, raid_bytes_show); 254a969f4ccSHans van Kranenburg BTRFS_ATTR(raid, used_bytes, raid_bytes_show); 2556ab0a202SJeff Mahoney 2566ab0a202SJeff Mahoney static ssize_t raid_bytes_show(struct kobject *kobj, 2576ab0a202SJeff Mahoney struct kobj_attribute *attr, char *buf) 2586ab0a202SJeff Mahoney 2596ab0a202SJeff Mahoney { 2606ab0a202SJeff Mahoney struct btrfs_space_info *sinfo = to_space_info(kobj->parent); 2616ab0a202SJeff Mahoney struct btrfs_block_group_cache *block_group; 26275cb379dSJeff Mahoney int index = btrfs_bg_flags_to_raid_index(to_raid_kobj(kobj)->flags); 2636ab0a202SJeff Mahoney u64 val = 0; 2646ab0a202SJeff Mahoney 2656ab0a202SJeff Mahoney down_read(&sinfo->groups_sem); 2666ab0a202SJeff Mahoney list_for_each_entry(block_group, &sinfo->block_groups[index], list) { 267a969f4ccSHans van Kranenburg if (&attr->attr == BTRFS_ATTR_PTR(raid, total_bytes)) 2686ab0a202SJeff Mahoney val += block_group->key.offset; 2696ab0a202SJeff Mahoney else 2706ab0a202SJeff Mahoney val += btrfs_block_group_used(&block_group->item); 2716ab0a202SJeff Mahoney } 2726ab0a202SJeff Mahoney up_read(&sinfo->groups_sem); 2736ab0a202SJeff Mahoney return snprintf(buf, PAGE_SIZE, "%llu\n", val); 2746ab0a202SJeff Mahoney } 2756ab0a202SJeff Mahoney 2766ab0a202SJeff Mahoney static struct attribute *raid_attributes[] = { 277a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(raid, total_bytes), 278a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(raid, used_bytes), 2796ab0a202SJeff Mahoney NULL 2806ab0a202SJeff Mahoney }; 2816ab0a202SJeff Mahoney 2826ab0a202SJeff Mahoney static void release_raid_kobj(struct kobject *kobj) 2836ab0a202SJeff Mahoney { 284c1895442SJeff Mahoney kfree(to_raid_kobj(kobj)); 2856ab0a202SJeff Mahoney } 2866ab0a202SJeff Mahoney 2876ab0a202SJeff Mahoney struct kobj_type btrfs_raid_ktype = { 2886ab0a202SJeff Mahoney .sysfs_ops = &kobj_sysfs_ops, 2896ab0a202SJeff Mahoney .release = release_raid_kobj, 2906ab0a202SJeff Mahoney .default_attrs = raid_attributes, 2916ab0a202SJeff Mahoney }; 2926ab0a202SJeff Mahoney 2936ab0a202SJeff Mahoney #define SPACE_INFO_ATTR(field) \ 2946ab0a202SJeff Mahoney static ssize_t btrfs_space_info_show_##field(struct kobject *kobj, \ 2956ab0a202SJeff Mahoney struct kobj_attribute *a, \ 2966ab0a202SJeff Mahoney char *buf) \ 2976ab0a202SJeff Mahoney { \ 2986ab0a202SJeff Mahoney struct btrfs_space_info *sinfo = to_space_info(kobj); \ 2996ab0a202SJeff Mahoney return btrfs_show_u64(&sinfo->field, &sinfo->lock, buf); \ 3006ab0a202SJeff Mahoney } \ 301a969f4ccSHans van Kranenburg BTRFS_ATTR(space_info, field, btrfs_space_info_show_##field) 3026ab0a202SJeff Mahoney 3036ab0a202SJeff Mahoney static ssize_t btrfs_space_info_show_total_bytes_pinned(struct kobject *kobj, 3046ab0a202SJeff Mahoney struct kobj_attribute *a, 3056ab0a202SJeff Mahoney char *buf) 3066ab0a202SJeff Mahoney { 3076ab0a202SJeff Mahoney struct btrfs_space_info *sinfo = to_space_info(kobj); 3086ab0a202SJeff Mahoney s64 val = percpu_counter_sum(&sinfo->total_bytes_pinned); 3096ab0a202SJeff Mahoney return snprintf(buf, PAGE_SIZE, "%lld\n", val); 3106ab0a202SJeff Mahoney } 3116ab0a202SJeff Mahoney 3126ab0a202SJeff Mahoney SPACE_INFO_ATTR(flags); 3136ab0a202SJeff Mahoney SPACE_INFO_ATTR(total_bytes); 3146ab0a202SJeff Mahoney SPACE_INFO_ATTR(bytes_used); 3156ab0a202SJeff Mahoney SPACE_INFO_ATTR(bytes_pinned); 3166ab0a202SJeff Mahoney SPACE_INFO_ATTR(bytes_reserved); 3176ab0a202SJeff Mahoney SPACE_INFO_ATTR(bytes_may_use); 318c1fd5c30SWang Xiaoguang SPACE_INFO_ATTR(bytes_readonly); 3196ab0a202SJeff Mahoney SPACE_INFO_ATTR(disk_used); 3206ab0a202SJeff Mahoney SPACE_INFO_ATTR(disk_total); 321a969f4ccSHans van Kranenburg BTRFS_ATTR(space_info, total_bytes_pinned, 322a969f4ccSHans van Kranenburg btrfs_space_info_show_total_bytes_pinned); 3236ab0a202SJeff Mahoney 3246ab0a202SJeff Mahoney static struct attribute *space_info_attrs[] = { 325a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, flags), 326a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, total_bytes), 327a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, bytes_used), 328a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, bytes_pinned), 329a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, bytes_reserved), 330a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, bytes_may_use), 331a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, bytes_readonly), 332a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, disk_used), 333a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, disk_total), 334a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, total_bytes_pinned), 3356ab0a202SJeff Mahoney NULL, 3366ab0a202SJeff Mahoney }; 3376ab0a202SJeff Mahoney 3386ab0a202SJeff Mahoney static void space_info_release(struct kobject *kobj) 3396ab0a202SJeff Mahoney { 3406ab0a202SJeff Mahoney struct btrfs_space_info *sinfo = to_space_info(kobj); 3416ab0a202SJeff Mahoney percpu_counter_destroy(&sinfo->total_bytes_pinned); 3426ab0a202SJeff Mahoney kfree(sinfo); 3436ab0a202SJeff Mahoney } 3446ab0a202SJeff Mahoney 3456ab0a202SJeff Mahoney struct kobj_type space_info_ktype = { 3466ab0a202SJeff Mahoney .sysfs_ops = &kobj_sysfs_ops, 3476ab0a202SJeff Mahoney .release = space_info_release, 3486ab0a202SJeff Mahoney .default_attrs = space_info_attrs, 3496ab0a202SJeff Mahoney }; 3506ab0a202SJeff Mahoney 3516ab0a202SJeff Mahoney static const struct attribute *allocation_attrs[] = { 352a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(allocation, global_rsv_reserved), 353a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(allocation, global_rsv_size), 3546ab0a202SJeff Mahoney NULL, 3556ab0a202SJeff Mahoney }; 3566ab0a202SJeff Mahoney 357f8ba9c11SJeff Mahoney static ssize_t btrfs_label_show(struct kobject *kobj, 358f8ba9c11SJeff Mahoney struct kobj_attribute *a, char *buf) 359f8ba9c11SJeff Mahoney { 360f8ba9c11SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj); 36148fcc3ffSSatoru Takeuchi char *label = fs_info->super_copy->label; 362ee17fc80SDavid Sterba ssize_t ret; 363ee17fc80SDavid Sterba 364ee17fc80SDavid Sterba spin_lock(&fs_info->super_lock); 365ee17fc80SDavid Sterba ret = snprintf(buf, PAGE_SIZE, label[0] ? "%s\n" : "%s", label); 366ee17fc80SDavid Sterba spin_unlock(&fs_info->super_lock); 367ee17fc80SDavid Sterba 368ee17fc80SDavid Sterba return ret; 369f8ba9c11SJeff Mahoney } 370f8ba9c11SJeff Mahoney 371f8ba9c11SJeff Mahoney static ssize_t btrfs_label_store(struct kobject *kobj, 372f8ba9c11SJeff Mahoney struct kobj_attribute *a, 373f8ba9c11SJeff Mahoney const char *buf, size_t len) 374f8ba9c11SJeff Mahoney { 375f8ba9c11SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj); 37648fcc3ffSSatoru Takeuchi size_t p_len; 377f8ba9c11SJeff Mahoney 37866ac9fe7SDavid Sterba if (!fs_info) 37966ac9fe7SDavid Sterba return -EPERM; 38066ac9fe7SDavid Sterba 381bc98a42cSDavid Howells if (sb_rdonly(fs_info->sb)) 38279aec2b8SAnand Jain return -EROFS; 38379aec2b8SAnand Jain 38448fcc3ffSSatoru Takeuchi /* 38548fcc3ffSSatoru Takeuchi * p_len is the len until the first occurrence of either 38648fcc3ffSSatoru Takeuchi * '\n' or '\0' 38748fcc3ffSSatoru Takeuchi */ 38848fcc3ffSSatoru Takeuchi p_len = strcspn(buf, "\n"); 38948fcc3ffSSatoru Takeuchi 39048fcc3ffSSatoru Takeuchi if (p_len >= BTRFS_LABEL_SIZE) 391f8ba9c11SJeff Mahoney return -EINVAL; 392f8ba9c11SJeff Mahoney 393a6f69dc8SDavid Sterba spin_lock(&fs_info->super_lock); 39448fcc3ffSSatoru Takeuchi memset(fs_info->super_copy->label, 0, BTRFS_LABEL_SIZE); 39548fcc3ffSSatoru Takeuchi memcpy(fs_info->super_copy->label, buf, p_len); 396a6f69dc8SDavid Sterba spin_unlock(&fs_info->super_lock); 397f8ba9c11SJeff Mahoney 398a6f69dc8SDavid Sterba /* 399a6f69dc8SDavid Sterba * We don't want to do full transaction commit from inside sysfs 400a6f69dc8SDavid Sterba */ 401a6f69dc8SDavid Sterba btrfs_set_pending(fs_info, COMMIT); 402a6f69dc8SDavid Sterba wake_up_process(fs_info->transaction_kthread); 403a6f69dc8SDavid Sterba 404f8ba9c11SJeff Mahoney return len; 405f8ba9c11SJeff Mahoney } 406a969f4ccSHans van Kranenburg BTRFS_ATTR_RW(, label, btrfs_label_show, btrfs_label_store); 407f8ba9c11SJeff Mahoney 408df93589aSDavid Sterba static ssize_t btrfs_nodesize_show(struct kobject *kobj, 409df93589aSDavid Sterba struct kobj_attribute *a, char *buf) 410df93589aSDavid Sterba { 411df93589aSDavid Sterba struct btrfs_fs_info *fs_info = to_fs_info(kobj); 412df93589aSDavid Sterba 413093e037cSDavid Sterba return snprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->nodesize); 414df93589aSDavid Sterba } 415df93589aSDavid Sterba 416a969f4ccSHans van Kranenburg BTRFS_ATTR(, nodesize, btrfs_nodesize_show); 417df93589aSDavid Sterba 418df93589aSDavid Sterba static ssize_t btrfs_sectorsize_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 423093e037cSDavid Sterba return snprintf(buf, PAGE_SIZE, "%u\n", 424093e037cSDavid Sterba fs_info->super_copy->sectorsize); 425df93589aSDavid Sterba } 426df93589aSDavid Sterba 427a969f4ccSHans van Kranenburg BTRFS_ATTR(, sectorsize, btrfs_sectorsize_show); 428df93589aSDavid Sterba 429df93589aSDavid Sterba static ssize_t btrfs_clone_alignment_show(struct kobject *kobj, 430df93589aSDavid Sterba struct kobj_attribute *a, char *buf) 431df93589aSDavid Sterba { 432df93589aSDavid Sterba struct btrfs_fs_info *fs_info = to_fs_info(kobj); 433df93589aSDavid Sterba 434093e037cSDavid Sterba return snprintf(buf, PAGE_SIZE, "%u\n", 435093e037cSDavid Sterba fs_info->super_copy->sectorsize); 436df93589aSDavid Sterba } 437df93589aSDavid Sterba 438a969f4ccSHans van Kranenburg BTRFS_ATTR(, clone_alignment, btrfs_clone_alignment_show); 439df93589aSDavid Sterba 4402723480aSSargun Dhillon static ssize_t quota_override_show(struct kobject *kobj, 4412723480aSSargun Dhillon struct kobj_attribute *a, char *buf) 4422723480aSSargun Dhillon { 4432723480aSSargun Dhillon struct btrfs_fs_info *fs_info = to_fs_info(kobj); 4442723480aSSargun Dhillon int quota_override; 4452723480aSSargun Dhillon 4462723480aSSargun Dhillon quota_override = test_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags); 4472723480aSSargun Dhillon return snprintf(buf, PAGE_SIZE, "%d\n", quota_override); 4482723480aSSargun Dhillon } 4492723480aSSargun Dhillon 4502723480aSSargun Dhillon static ssize_t quota_override_store(struct kobject *kobj, 4512723480aSSargun Dhillon struct kobj_attribute *a, 4522723480aSSargun Dhillon const char *buf, size_t len) 4532723480aSSargun Dhillon { 4542723480aSSargun Dhillon struct btrfs_fs_info *fs_info = to_fs_info(kobj); 4552723480aSSargun Dhillon unsigned long knob; 4562723480aSSargun Dhillon int err; 4572723480aSSargun Dhillon 4582723480aSSargun Dhillon if (!fs_info) 4592723480aSSargun Dhillon return -EPERM; 4602723480aSSargun Dhillon 4612723480aSSargun Dhillon if (!capable(CAP_SYS_RESOURCE)) 4622723480aSSargun Dhillon return -EPERM; 4632723480aSSargun Dhillon 4642723480aSSargun Dhillon err = kstrtoul(buf, 10, &knob); 4652723480aSSargun Dhillon if (err) 4662723480aSSargun Dhillon return err; 4672723480aSSargun Dhillon if (knob > 1) 4682723480aSSargun Dhillon return -EINVAL; 4692723480aSSargun Dhillon 4702723480aSSargun Dhillon if (knob) 4712723480aSSargun Dhillon set_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags); 4722723480aSSargun Dhillon else 4732723480aSSargun Dhillon clear_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags); 4742723480aSSargun Dhillon 4752723480aSSargun Dhillon return len; 4762723480aSSargun Dhillon } 4772723480aSSargun Dhillon 478a969f4ccSHans van Kranenburg BTRFS_ATTR_RW(, quota_override, quota_override_show, quota_override_store); 4792723480aSSargun Dhillon 4800dd2906fSAnand Jain static const struct attribute *btrfs_attrs[] = { 481a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(, label), 482a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(, nodesize), 483a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(, sectorsize), 484a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(, clone_alignment), 485a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(, quota_override), 486f8ba9c11SJeff Mahoney NULL, 487f8ba9c11SJeff Mahoney }; 488f8ba9c11SJeff Mahoney 489c1b7e474SAnand Jain static void btrfs_release_fsid_kobj(struct kobject *kobj) 490510d7360SJeff Mahoney { 4912e7910d6SAnand Jain struct btrfs_fs_devices *fs_devs = to_fs_devs(kobj); 492248d200dSAnand Jain 493c1b7e474SAnand Jain memset(&fs_devs->fsid_kobj, 0, sizeof(struct kobject)); 4942e7910d6SAnand Jain complete(&fs_devs->kobj_unregister); 495510d7360SJeff Mahoney } 496510d7360SJeff Mahoney 497510d7360SJeff Mahoney static struct kobj_type btrfs_ktype = { 498510d7360SJeff Mahoney .sysfs_ops = &kobj_sysfs_ops, 499c1b7e474SAnand Jain .release = btrfs_release_fsid_kobj, 500510d7360SJeff Mahoney }; 501510d7360SJeff Mahoney 5022e7910d6SAnand Jain static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj) 5032e7910d6SAnand Jain { 5042e7910d6SAnand Jain if (kobj->ktype != &btrfs_ktype) 5052e7910d6SAnand Jain return NULL; 506c1b7e474SAnand Jain return container_of(kobj, struct btrfs_fs_devices, fsid_kobj); 5072e7910d6SAnand Jain } 5082e7910d6SAnand Jain 509510d7360SJeff Mahoney static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj) 510510d7360SJeff Mahoney { 511510d7360SJeff Mahoney if (kobj->ktype != &btrfs_ktype) 512510d7360SJeff Mahoney return NULL; 5132e7910d6SAnand Jain return to_fs_devs(kobj)->fs_info; 514510d7360SJeff Mahoney } 51558176a96SJosef Bacik 516e453d989SJeff Mahoney #define NUM_FEATURE_BITS 64 517e453d989SJeff Mahoney static char btrfs_unknown_feature_names[3][NUM_FEATURE_BITS][13]; 518e453d989SJeff Mahoney static struct btrfs_feature_attr btrfs_feature_attrs[3][NUM_FEATURE_BITS]; 519e453d989SJeff Mahoney 520e8c9f186SDavid Sterba static const u64 supported_feature_masks[3] = { 521e453d989SJeff Mahoney [FEAT_COMPAT] = BTRFS_FEATURE_COMPAT_SUPP, 522e453d989SJeff Mahoney [FEAT_COMPAT_RO] = BTRFS_FEATURE_COMPAT_RO_SUPP, 523e453d989SJeff Mahoney [FEAT_INCOMPAT] = BTRFS_FEATURE_INCOMPAT_SUPP, 524e453d989SJeff Mahoney }; 525e453d989SJeff Mahoney 526e453d989SJeff Mahoney static int addrm_unknown_feature_attrs(struct btrfs_fs_info *fs_info, bool add) 5275ac1d209SJeff Mahoney { 528e453d989SJeff Mahoney int set; 529e453d989SJeff Mahoney 530e453d989SJeff Mahoney for (set = 0; set < FEAT_MAX; set++) { 531e453d989SJeff Mahoney int i; 532e453d989SJeff Mahoney struct attribute *attrs[2]; 533e453d989SJeff Mahoney struct attribute_group agroup = { 534e453d989SJeff Mahoney .name = "features", 535e453d989SJeff Mahoney .attrs = attrs, 536e453d989SJeff Mahoney }; 537e453d989SJeff Mahoney u64 features = get_features(fs_info, set); 538e453d989SJeff Mahoney features &= ~supported_feature_masks[set]; 539e453d989SJeff Mahoney 540e453d989SJeff Mahoney if (!features) 541e453d989SJeff Mahoney continue; 542e453d989SJeff Mahoney 543e453d989SJeff Mahoney attrs[1] = NULL; 544e453d989SJeff Mahoney for (i = 0; i < NUM_FEATURE_BITS; i++) { 545e453d989SJeff Mahoney struct btrfs_feature_attr *fa; 546e453d989SJeff Mahoney 547e453d989SJeff Mahoney if (!(features & (1ULL << i))) 548e453d989SJeff Mahoney continue; 549e453d989SJeff Mahoney 550e453d989SJeff Mahoney fa = &btrfs_feature_attrs[set][i]; 551e453d989SJeff Mahoney attrs[0] = &fa->kobj_attr.attr; 552e453d989SJeff Mahoney if (add) { 553e453d989SJeff Mahoney int ret; 554c1b7e474SAnand Jain ret = sysfs_merge_group(&fs_info->fs_devices->fsid_kobj, 555e453d989SJeff Mahoney &agroup); 556e453d989SJeff Mahoney if (ret) 557e453d989SJeff Mahoney return ret; 558e453d989SJeff Mahoney } else 559c1b7e474SAnand Jain sysfs_unmerge_group(&fs_info->fs_devices->fsid_kobj, 560e453d989SJeff Mahoney &agroup); 561e453d989SJeff Mahoney } 562e453d989SJeff Mahoney 563e453d989SJeff Mahoney } 564e453d989SJeff Mahoney return 0; 565e453d989SJeff Mahoney } 566e453d989SJeff Mahoney 5672e3e1281SAnand Jain static void __btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs) 568e453d989SJeff Mahoney { 5692e7910d6SAnand Jain if (fs_devs->device_dir_kobj) { 5702e7910d6SAnand Jain kobject_del(fs_devs->device_dir_kobj); 5712e7910d6SAnand Jain kobject_put(fs_devs->device_dir_kobj); 5722e7910d6SAnand Jain fs_devs->device_dir_kobj = NULL; 573aaf13305SAnand Jain } 574aaf13305SAnand Jain 575c1b7e474SAnand Jain if (fs_devs->fsid_kobj.state_initialized) { 576c1b7e474SAnand Jain kobject_del(&fs_devs->fsid_kobj); 577c1b7e474SAnand Jain kobject_put(&fs_devs->fsid_kobj); 5782e7910d6SAnand Jain wait_for_completion(&fs_devs->kobj_unregister); 5795ac1d209SJeff Mahoney } 580f90fc547SAnand Jain } 5815ac1d209SJeff Mahoney 5822e3e1281SAnand Jain /* when fs_devs is NULL it will remove all fsid kobject */ 5831d1c1be3SAnand Jain void btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs) 5842e3e1281SAnand Jain { 5852e3e1281SAnand Jain struct list_head *fs_uuids = btrfs_get_fs_uuids(); 5862e3e1281SAnand Jain 5872e3e1281SAnand Jain if (fs_devs) { 5882e3e1281SAnand Jain __btrfs_sysfs_remove_fsid(fs_devs); 5892e3e1281SAnand Jain return; 5902e3e1281SAnand Jain } 5912e3e1281SAnand Jain 5922e3e1281SAnand Jain list_for_each_entry(fs_devs, fs_uuids, list) { 5932e3e1281SAnand Jain __btrfs_sysfs_remove_fsid(fs_devs); 5942e3e1281SAnand Jain } 5952e3e1281SAnand Jain } 5962e3e1281SAnand Jain 5976618a59bSAnand Jain void btrfs_sysfs_remove_mounted(struct btrfs_fs_info *fs_info) 598e453d989SJeff Mahoney { 5995a13f430SAnand Jain btrfs_reset_fs_info_ptr(fs_info); 6005a13f430SAnand Jain 601e453d989SJeff Mahoney if (fs_info->space_info_kobj) { 602e453d989SJeff Mahoney sysfs_remove_files(fs_info->space_info_kobj, allocation_attrs); 603e453d989SJeff Mahoney kobject_del(fs_info->space_info_kobj); 604e453d989SJeff Mahoney kobject_put(fs_info->space_info_kobj); 605e453d989SJeff Mahoney } 606e453d989SJeff Mahoney addrm_unknown_feature_attrs(fs_info, false); 607c1b7e474SAnand Jain sysfs_remove_group(&fs_info->fs_devices->fsid_kobj, &btrfs_feature_attr_group); 608c1b7e474SAnand Jain sysfs_remove_files(&fs_info->fs_devices->fsid_kobj, btrfs_attrs); 60932576040SAnand Jain btrfs_sysfs_rm_device_link(fs_info->fs_devices, NULL); 610e453d989SJeff Mahoney } 611e453d989SJeff Mahoney 61279da4fa4SJeff Mahoney const char * const btrfs_feature_set_names[3] = { 61379da4fa4SJeff Mahoney [FEAT_COMPAT] = "compat", 61479da4fa4SJeff Mahoney [FEAT_COMPAT_RO] = "compat_ro", 61579da4fa4SJeff Mahoney [FEAT_INCOMPAT] = "incompat", 61679da4fa4SJeff Mahoney }; 61779da4fa4SJeff Mahoney 6183b02a68aSJeff Mahoney char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags) 6193b02a68aSJeff Mahoney { 6203b02a68aSJeff Mahoney size_t bufsize = 4096; /* safe max, 64 names * 64 bytes */ 6213b02a68aSJeff Mahoney int len = 0; 6223b02a68aSJeff Mahoney int i; 6233b02a68aSJeff Mahoney char *str; 6243b02a68aSJeff Mahoney 6253b02a68aSJeff Mahoney str = kmalloc(bufsize, GFP_KERNEL); 6263b02a68aSJeff Mahoney if (!str) 6273b02a68aSJeff Mahoney return str; 6283b02a68aSJeff Mahoney 6293b02a68aSJeff Mahoney for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { 6303b02a68aSJeff Mahoney const char *name; 6313b02a68aSJeff Mahoney 6323b02a68aSJeff Mahoney if (!(flags & (1ULL << i))) 6333b02a68aSJeff Mahoney continue; 6343b02a68aSJeff Mahoney 6353b02a68aSJeff Mahoney name = btrfs_feature_attrs[set][i].kobj_attr.attr.name; 6363b02a68aSJeff Mahoney len += snprintf(str + len, bufsize - len, "%s%s", 6373b02a68aSJeff Mahoney len ? "," : "", name); 6383b02a68aSJeff Mahoney } 6393b02a68aSJeff Mahoney 6403b02a68aSJeff Mahoney return str; 6413b02a68aSJeff Mahoney } 6423b02a68aSJeff Mahoney 64379da4fa4SJeff Mahoney static void init_feature_attrs(void) 64479da4fa4SJeff Mahoney { 64579da4fa4SJeff Mahoney struct btrfs_feature_attr *fa; 64679da4fa4SJeff Mahoney int set, i; 64779da4fa4SJeff Mahoney 64879da4fa4SJeff Mahoney BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names) != 64979da4fa4SJeff Mahoney ARRAY_SIZE(btrfs_feature_attrs)); 65079da4fa4SJeff Mahoney BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names[0]) != 65179da4fa4SJeff Mahoney ARRAY_SIZE(btrfs_feature_attrs[0])); 65279da4fa4SJeff Mahoney 6533b02a68aSJeff Mahoney memset(btrfs_feature_attrs, 0, sizeof(btrfs_feature_attrs)); 6543b02a68aSJeff Mahoney memset(btrfs_unknown_feature_names, 0, 6553b02a68aSJeff Mahoney sizeof(btrfs_unknown_feature_names)); 6563b02a68aSJeff Mahoney 65779da4fa4SJeff Mahoney for (i = 0; btrfs_supported_feature_attrs[i]; i++) { 65879da4fa4SJeff Mahoney struct btrfs_feature_attr *sfa; 65979da4fa4SJeff Mahoney struct attribute *a = btrfs_supported_feature_attrs[i]; 6603b02a68aSJeff Mahoney int bit; 66179da4fa4SJeff Mahoney sfa = attr_to_btrfs_feature_attr(a); 6623b02a68aSJeff Mahoney bit = ilog2(sfa->feature_bit); 6633b02a68aSJeff Mahoney fa = &btrfs_feature_attrs[sfa->feature_set][bit]; 66479da4fa4SJeff Mahoney 66579da4fa4SJeff Mahoney fa->kobj_attr.attr.name = sfa->kobj_attr.attr.name; 66679da4fa4SJeff Mahoney } 66779da4fa4SJeff Mahoney 66879da4fa4SJeff Mahoney for (set = 0; set < FEAT_MAX; set++) { 66979da4fa4SJeff Mahoney for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { 67079da4fa4SJeff Mahoney char *name = btrfs_unknown_feature_names[set][i]; 67179da4fa4SJeff Mahoney fa = &btrfs_feature_attrs[set][i]; 67279da4fa4SJeff Mahoney 67379da4fa4SJeff Mahoney if (fa->kobj_attr.attr.name) 67479da4fa4SJeff Mahoney continue; 67579da4fa4SJeff Mahoney 67679da4fa4SJeff Mahoney snprintf(name, 13, "%s:%u", 67779da4fa4SJeff Mahoney btrfs_feature_set_names[set], i); 67879da4fa4SJeff Mahoney 67979da4fa4SJeff Mahoney fa->kobj_attr.attr.name = name; 68079da4fa4SJeff Mahoney fa->kobj_attr.attr.mode = S_IRUGO; 68179da4fa4SJeff Mahoney fa->feature_set = set; 68279da4fa4SJeff Mahoney fa->feature_bit = 1ULL << i; 68379da4fa4SJeff Mahoney } 68479da4fa4SJeff Mahoney } 68579da4fa4SJeff Mahoney } 68679da4fa4SJeff Mahoney 687e7e1aa9cSAnand Jain /* when one_device is NULL, it removes all device links */ 688e7e1aa9cSAnand Jain 68932576040SAnand Jain int btrfs_sysfs_rm_device_link(struct btrfs_fs_devices *fs_devices, 69099994cdeSAnand Jain struct btrfs_device *one_device) 69199994cdeSAnand Jain { 69299994cdeSAnand Jain struct hd_struct *disk; 69399994cdeSAnand Jain struct kobject *disk_kobj; 69499994cdeSAnand Jain 6956c14a164SAnand Jain if (!fs_devices->device_dir_kobj) 69699994cdeSAnand Jain return -EINVAL; 69799994cdeSAnand Jain 69887fa3bb0SLiu Bo if (one_device && one_device->bdev) { 69999994cdeSAnand Jain disk = one_device->bdev->bd_part; 70099994cdeSAnand Jain disk_kobj = &part_to_dev(disk)->kobj; 70199994cdeSAnand Jain 7026c14a164SAnand Jain sysfs_remove_link(fs_devices->device_dir_kobj, 70399994cdeSAnand Jain disk_kobj->name); 70499994cdeSAnand Jain } 70599994cdeSAnand Jain 706e7e1aa9cSAnand Jain if (one_device) 707e7e1aa9cSAnand Jain return 0; 708e7e1aa9cSAnand Jain 709e7e1aa9cSAnand Jain list_for_each_entry(one_device, 7106c14a164SAnand Jain &fs_devices->devices, dev_list) { 711e7e1aa9cSAnand Jain if (!one_device->bdev) 712e7e1aa9cSAnand Jain continue; 713e7e1aa9cSAnand Jain disk = one_device->bdev->bd_part; 714e7e1aa9cSAnand Jain disk_kobj = &part_to_dev(disk)->kobj; 715e7e1aa9cSAnand Jain 7166c14a164SAnand Jain sysfs_remove_link(fs_devices->device_dir_kobj, 717e7e1aa9cSAnand Jain disk_kobj->name); 718e7e1aa9cSAnand Jain } 719e7e1aa9cSAnand Jain 72099994cdeSAnand Jain return 0; 72199994cdeSAnand Jain } 72299994cdeSAnand Jain 7232e7910d6SAnand Jain int btrfs_sysfs_add_device(struct btrfs_fs_devices *fs_devs) 72400c921c2SAnand Jain { 7252e7910d6SAnand Jain if (!fs_devs->device_dir_kobj) 7262e7910d6SAnand Jain fs_devs->device_dir_kobj = kobject_create_and_add("devices", 727c1b7e474SAnand Jain &fs_devs->fsid_kobj); 72800c921c2SAnand Jain 7292e7910d6SAnand Jain if (!fs_devs->device_dir_kobj) 73000c921c2SAnand Jain return -ENOMEM; 73100c921c2SAnand Jain 73200c921c2SAnand Jain return 0; 73300c921c2SAnand Jain } 73400c921c2SAnand Jain 735e3bd6973SAnand Jain int btrfs_sysfs_add_device_link(struct btrfs_fs_devices *fs_devices, 7360d39376aSAnand Jain struct btrfs_device *one_device) 73729e5be24SJeff Mahoney { 73829e5be24SJeff Mahoney int error = 0; 73929e5be24SJeff Mahoney struct btrfs_device *dev; 74029e5be24SJeff Mahoney 74129e5be24SJeff Mahoney list_for_each_entry(dev, &fs_devices->devices, dev_list) { 742f085381eSAnand Jain struct hd_struct *disk; 743f085381eSAnand Jain struct kobject *disk_kobj; 744f085381eSAnand Jain 745f085381eSAnand Jain if (!dev->bdev) 746f085381eSAnand Jain continue; 747f085381eSAnand Jain 7480d39376aSAnand Jain if (one_device && one_device != dev) 7490d39376aSAnand Jain continue; 7500d39376aSAnand Jain 751f085381eSAnand Jain disk = dev->bdev->bd_part; 752f085381eSAnand Jain disk_kobj = &part_to_dev(disk)->kobj; 75329e5be24SJeff Mahoney 7542e7910d6SAnand Jain error = sysfs_create_link(fs_devices->device_dir_kobj, 75529e5be24SJeff Mahoney disk_kobj, disk_kobj->name); 75629e5be24SJeff Mahoney if (error) 75729e5be24SJeff Mahoney break; 75829e5be24SJeff Mahoney } 75929e5be24SJeff Mahoney 76029e5be24SJeff Mahoney return error; 76129e5be24SJeff Mahoney } 76229e5be24SJeff Mahoney 763510d7360SJeff Mahoney /* /sys/fs/btrfs/ entry */ 764510d7360SJeff Mahoney static struct kset *btrfs_kset; 765510d7360SJeff Mahoney 7661bae3098SDavid Sterba /* /sys/kernel/debug/btrfs */ 7671bae3098SDavid Sterba static struct dentry *btrfs_debugfs_root_dentry; 7681bae3098SDavid Sterba 7691bae3098SDavid Sterba /* Debugging tunables and exported data */ 7701bae3098SDavid Sterba u64 btrfs_debugfs_test; 7711bae3098SDavid Sterba 77272059215SAnand Jain /* 77372059215SAnand Jain * Can be called by the device discovery thread. 77472059215SAnand Jain * And parent can be specified for seed device 77572059215SAnand Jain */ 7760c10e2d4SAnand Jain int btrfs_sysfs_add_fsid(struct btrfs_fs_devices *fs_devs, 77772059215SAnand Jain struct kobject *parent) 7785ac1d209SJeff Mahoney { 7795ac1d209SJeff Mahoney int error; 7805ac1d209SJeff Mahoney 7812e7910d6SAnand Jain init_completion(&fs_devs->kobj_unregister); 782c1b7e474SAnand Jain fs_devs->fsid_kobj.kset = btrfs_kset; 783c1b7e474SAnand Jain error = kobject_init_and_add(&fs_devs->fsid_kobj, 78424bd69cbSAnand Jain &btrfs_ktype, parent, "%pU", fs_devs->fsid); 78572059215SAnand Jain return error; 78672059215SAnand Jain } 78772059215SAnand Jain 78896f3136eSAnand Jain int btrfs_sysfs_add_mounted(struct btrfs_fs_info *fs_info) 78972059215SAnand Jain { 79072059215SAnand Jain int error; 7912e7910d6SAnand Jain struct btrfs_fs_devices *fs_devs = fs_info->fs_devices; 792c1b7e474SAnand Jain struct kobject *fsid_kobj = &fs_devs->fsid_kobj; 79372059215SAnand Jain 7945a13f430SAnand Jain btrfs_set_fs_info_ptr(fs_info); 7955a13f430SAnand Jain 796e3bd6973SAnand Jain error = btrfs_sysfs_add_device_link(fs_devs, NULL); 797e453d989SJeff Mahoney if (error) 798e453d989SJeff Mahoney return error; 799510d7360SJeff Mahoney 800c1b7e474SAnand Jain error = sysfs_create_files(fsid_kobj, btrfs_attrs); 801e453d989SJeff Mahoney if (error) { 80232576040SAnand Jain btrfs_sysfs_rm_device_link(fs_devs, NULL); 803e453d989SJeff Mahoney return error; 804e453d989SJeff Mahoney } 80579da4fa4SJeff Mahoney 806c1b7e474SAnand Jain error = sysfs_create_group(fsid_kobj, 8070dd2906fSAnand Jain &btrfs_feature_attr_group); 8080dd2906fSAnand Jain if (error) 8090dd2906fSAnand Jain goto failure; 8100dd2906fSAnand Jain 811e453d989SJeff Mahoney error = addrm_unknown_feature_attrs(fs_info, true); 81279da4fa4SJeff Mahoney if (error) 81379da4fa4SJeff Mahoney goto failure; 81479da4fa4SJeff Mahoney 8156ab0a202SJeff Mahoney fs_info->space_info_kobj = kobject_create_and_add("allocation", 816c1b7e474SAnand Jain fsid_kobj); 8176ab0a202SJeff Mahoney if (!fs_info->space_info_kobj) { 8186ab0a202SJeff Mahoney error = -ENOMEM; 8196ab0a202SJeff Mahoney goto failure; 8206ab0a202SJeff Mahoney } 8216ab0a202SJeff Mahoney 8226ab0a202SJeff Mahoney error = sysfs_create_files(fs_info->space_info_kobj, allocation_attrs); 8236ab0a202SJeff Mahoney if (error) 8246ab0a202SJeff Mahoney goto failure; 8256ab0a202SJeff Mahoney 82679da4fa4SJeff Mahoney return 0; 82779da4fa4SJeff Mahoney failure: 8286618a59bSAnand Jain btrfs_sysfs_remove_mounted(fs_info); 8295ac1d209SJeff Mahoney return error; 8305ac1d209SJeff Mahoney } 8315ac1d209SJeff Mahoney 832444e7516SDavid Sterba 833444e7516SDavid Sterba /* 834444e7516SDavid Sterba * Change per-fs features in /sys/fs/btrfs/UUID/features to match current 835444e7516SDavid Sterba * values in superblock. Call after any changes to incompat/compat_ro flags 836444e7516SDavid Sterba */ 837444e7516SDavid Sterba void btrfs_sysfs_feature_update(struct btrfs_fs_info *fs_info, 838444e7516SDavid Sterba u64 bit, enum btrfs_feature_set set) 839444e7516SDavid Sterba { 840444e7516SDavid Sterba struct btrfs_fs_devices *fs_devs; 841444e7516SDavid Sterba struct kobject *fsid_kobj; 842444e7516SDavid Sterba u64 features; 843444e7516SDavid Sterba int ret; 844444e7516SDavid Sterba 845444e7516SDavid Sterba if (!fs_info) 846444e7516SDavid Sterba return; 847444e7516SDavid Sterba 848444e7516SDavid Sterba features = get_features(fs_info, set); 849444e7516SDavid Sterba ASSERT(bit & supported_feature_masks[set]); 850444e7516SDavid Sterba 851444e7516SDavid Sterba fs_devs = fs_info->fs_devices; 852444e7516SDavid Sterba fsid_kobj = &fs_devs->fsid_kobj; 853444e7516SDavid Sterba 854bf609206SDavid Sterba if (!fsid_kobj->state_initialized) 855bf609206SDavid Sterba return; 856bf609206SDavid Sterba 857444e7516SDavid Sterba /* 858444e7516SDavid Sterba * FIXME: this is too heavy to update just one value, ideally we'd like 859444e7516SDavid Sterba * to use sysfs_update_group but some refactoring is needed first. 860444e7516SDavid Sterba */ 861444e7516SDavid Sterba sysfs_remove_group(fsid_kobj, &btrfs_feature_attr_group); 862444e7516SDavid Sterba ret = sysfs_create_group(fsid_kobj, &btrfs_feature_attr_group); 863444e7516SDavid Sterba } 864444e7516SDavid Sterba 8651bae3098SDavid Sterba static int btrfs_init_debugfs(void) 8661bae3098SDavid Sterba { 8671bae3098SDavid Sterba #ifdef CONFIG_DEBUG_FS 8681bae3098SDavid Sterba btrfs_debugfs_root_dentry = debugfs_create_dir("btrfs", NULL); 8691bae3098SDavid Sterba if (!btrfs_debugfs_root_dentry) 8701bae3098SDavid Sterba return -ENOMEM; 8711bae3098SDavid Sterba 872b0de6c4cSDavid Sterba /* 873b0de6c4cSDavid Sterba * Example code, how to export data through debugfs. 874b0de6c4cSDavid Sterba * 875b0de6c4cSDavid Sterba * file: /sys/kernel/debug/btrfs/test 876b0de6c4cSDavid Sterba * contents of: btrfs_debugfs_test 877b0de6c4cSDavid Sterba */ 878b0de6c4cSDavid Sterba #ifdef CONFIG_BTRFS_DEBUG 87907f6a480SEric Sandeen debugfs_create_u64("test", S_IRUGO | S_IWUSR, btrfs_debugfs_root_dentry, 8801bae3098SDavid Sterba &btrfs_debugfs_test); 8811bae3098SDavid Sterba #endif 882b0de6c4cSDavid Sterba 883b0de6c4cSDavid Sterba #endif 8841bae3098SDavid Sterba return 0; 8851bae3098SDavid Sterba } 8861bae3098SDavid Sterba 887f5c29bd9SLiu Bo int __init btrfs_init_sysfs(void) 88858176a96SJosef Bacik { 889079b72bcSJeff Mahoney int ret; 8901bae3098SDavid Sterba 891e3fe4e71SGreg KH btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj); 892e3fe4e71SGreg KH if (!btrfs_kset) 893e3fe4e71SGreg KH return -ENOMEM; 894079b72bcSJeff Mahoney 8951bae3098SDavid Sterba ret = btrfs_init_debugfs(); 8961bae3098SDavid Sterba if (ret) 897001a648dSFilipe Manana goto out1; 898079b72bcSJeff Mahoney 8991bae3098SDavid Sterba init_feature_attrs(); 9001bae3098SDavid Sterba ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); 901001a648dSFilipe Manana if (ret) 902001a648dSFilipe Manana goto out2; 903001a648dSFilipe Manana 904001a648dSFilipe Manana return 0; 905001a648dSFilipe Manana out2: 906001a648dSFilipe Manana debugfs_remove_recursive(btrfs_debugfs_root_dentry); 907001a648dSFilipe Manana out1: 908001a648dSFilipe Manana kset_unregister(btrfs_kset); 9091bae3098SDavid Sterba 9101bae3098SDavid Sterba return ret; 91158176a96SJosef Bacik } 91258176a96SJosef Bacik 913e67c718bSDavid Sterba void __cold btrfs_exit_sysfs(void) 91458176a96SJosef Bacik { 915079b72bcSJeff Mahoney sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); 916e3fe4e71SGreg KH kset_unregister(btrfs_kset); 9171bae3098SDavid Sterba debugfs_remove_recursive(btrfs_debugfs_root_dentry); 91858176a96SJosef Bacik } 91955d47414SChris Mason 920