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/kobject.h> 1179da4fa4SJeff Mahoney #include <linux/bug.h> 121bae3098SDavid Sterba #include <linux/debugfs.h> 1358176a96SJosef Bacik 14bae45de0SChris Mason #include "ctree.h" 15bae45de0SChris Mason #include "disk-io.h" 16bae45de0SChris Mason #include "transaction.h" 17079b72bcSJeff Mahoney #include "sysfs.h" 1829e5be24SJeff Mahoney #include "volumes.h" 198719aaaeSJosef Bacik #include "space-info.h" 20aac0023cSJosef Bacik #include "block-group.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); 19656f20f40SNikolay Borisov BTRFS_FEAT_ATTR_INCOMPAT(metadata_uuid, METADATA_UUID); 1973b5bb73bSDavid Sterba BTRFS_FEAT_ATTR_COMPAT_RO(free_space_tree, FREE_SPACE_TREE); 198079b72bcSJeff Mahoney 199079b72bcSJeff Mahoney static struct attribute *btrfs_supported_feature_attrs[] = { 200079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(mixed_backref), 201079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(default_subvol), 202079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(mixed_groups), 203079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(compress_lzo), 2045c1aab1dSNick Terrell BTRFS_FEAT_ATTR_PTR(compress_zstd), 205079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(big_metadata), 206079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(extended_iref), 207079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(raid56), 208079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(skinny_metadata), 209c736c095SDavid Sterba BTRFS_FEAT_ATTR_PTR(no_holes), 21056f20f40SNikolay Borisov BTRFS_FEAT_ATTR_PTR(metadata_uuid), 2113b5bb73bSDavid Sterba BTRFS_FEAT_ATTR_PTR(free_space_tree), 212079b72bcSJeff Mahoney NULL 213079b72bcSJeff Mahoney }; 214079b72bcSJeff Mahoney 215f902bd3aSMisono Tomohiro /* 216f902bd3aSMisono Tomohiro * Features which depend on feature bits and may differ between each fs. 217f902bd3aSMisono Tomohiro * 218f902bd3aSMisono Tomohiro * /sys/fs/btrfs/features lists all available features of this kernel while 219f902bd3aSMisono Tomohiro * /sys/fs/btrfs/UUID/features shows features of the fs which are enabled or 220f902bd3aSMisono Tomohiro * can be changed online. 221f902bd3aSMisono Tomohiro */ 222079b72bcSJeff Mahoney static const struct attribute_group btrfs_feature_attr_group = { 223079b72bcSJeff Mahoney .name = "features", 224510d7360SJeff Mahoney .is_visible = btrfs_feature_visible, 225079b72bcSJeff Mahoney .attrs = btrfs_supported_feature_attrs, 226079b72bcSJeff Mahoney }; 22758176a96SJosef Bacik 228f902bd3aSMisono Tomohiro static ssize_t rmdir_subvol_show(struct kobject *kobj, 229f902bd3aSMisono Tomohiro struct kobj_attribute *ka, char *buf) 230f902bd3aSMisono Tomohiro { 231f902bd3aSMisono Tomohiro return snprintf(buf, PAGE_SIZE, "0\n"); 232f902bd3aSMisono Tomohiro } 233f902bd3aSMisono Tomohiro BTRFS_ATTR(static_feature, rmdir_subvol, rmdir_subvol_show); 234f902bd3aSMisono Tomohiro 235f902bd3aSMisono Tomohiro static struct attribute *btrfs_supported_static_feature_attrs[] = { 236f902bd3aSMisono Tomohiro BTRFS_ATTR_PTR(static_feature, rmdir_subvol), 237f902bd3aSMisono Tomohiro NULL 238f902bd3aSMisono Tomohiro }; 239f902bd3aSMisono Tomohiro 240f902bd3aSMisono Tomohiro /* 241f902bd3aSMisono Tomohiro * Features which only depend on kernel version. 242f902bd3aSMisono Tomohiro * 243f902bd3aSMisono Tomohiro * These are listed in /sys/fs/btrfs/features along with 244f902bd3aSMisono Tomohiro * btrfs_feature_attr_group 245f902bd3aSMisono Tomohiro */ 246f902bd3aSMisono Tomohiro static const struct attribute_group btrfs_static_feature_attr_group = { 247f902bd3aSMisono Tomohiro .name = "features", 248f902bd3aSMisono Tomohiro .attrs = btrfs_supported_static_feature_attrs, 249f902bd3aSMisono Tomohiro }; 250f902bd3aSMisono Tomohiro 2516ab0a202SJeff Mahoney static ssize_t btrfs_show_u64(u64 *value_ptr, spinlock_t *lock, char *buf) 2526ab0a202SJeff Mahoney { 2536ab0a202SJeff Mahoney u64 val; 2546ab0a202SJeff Mahoney if (lock) 2556ab0a202SJeff Mahoney spin_lock(lock); 2566ab0a202SJeff Mahoney val = *value_ptr; 2576ab0a202SJeff Mahoney if (lock) 2586ab0a202SJeff Mahoney spin_unlock(lock); 2596ab0a202SJeff Mahoney return snprintf(buf, PAGE_SIZE, "%llu\n", val); 2606ab0a202SJeff Mahoney } 2616ab0a202SJeff Mahoney 2626ab0a202SJeff Mahoney static ssize_t global_rsv_size_show(struct kobject *kobj, 2636ab0a202SJeff Mahoney struct kobj_attribute *ka, char *buf) 2646ab0a202SJeff Mahoney { 2656ab0a202SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); 2666ab0a202SJeff Mahoney struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 2676ab0a202SJeff Mahoney return btrfs_show_u64(&block_rsv->size, &block_rsv->lock, buf); 2686ab0a202SJeff Mahoney } 269a969f4ccSHans van Kranenburg BTRFS_ATTR(allocation, global_rsv_size, global_rsv_size_show); 2706ab0a202SJeff Mahoney 2716ab0a202SJeff Mahoney static ssize_t global_rsv_reserved_show(struct kobject *kobj, 2726ab0a202SJeff Mahoney struct kobj_attribute *a, char *buf) 2736ab0a202SJeff Mahoney { 2746ab0a202SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); 2756ab0a202SJeff Mahoney struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 2766ab0a202SJeff Mahoney return btrfs_show_u64(&block_rsv->reserved, &block_rsv->lock, buf); 2776ab0a202SJeff Mahoney } 278a969f4ccSHans van Kranenburg BTRFS_ATTR(allocation, global_rsv_reserved, global_rsv_reserved_show); 2796ab0a202SJeff Mahoney 2806ab0a202SJeff Mahoney #define to_space_info(_kobj) container_of(_kobj, struct btrfs_space_info, kobj) 281c1895442SJeff Mahoney #define to_raid_kobj(_kobj) container_of(_kobj, struct raid_kobject, kobj) 2826ab0a202SJeff Mahoney 2836ab0a202SJeff Mahoney static ssize_t raid_bytes_show(struct kobject *kobj, 2846ab0a202SJeff Mahoney struct kobj_attribute *attr, char *buf); 285a969f4ccSHans van Kranenburg BTRFS_ATTR(raid, total_bytes, raid_bytes_show); 286a969f4ccSHans van Kranenburg BTRFS_ATTR(raid, used_bytes, raid_bytes_show); 2876ab0a202SJeff Mahoney 2886ab0a202SJeff Mahoney static ssize_t raid_bytes_show(struct kobject *kobj, 2896ab0a202SJeff Mahoney struct kobj_attribute *attr, char *buf) 2906ab0a202SJeff Mahoney 2916ab0a202SJeff Mahoney { 2926ab0a202SJeff Mahoney struct btrfs_space_info *sinfo = to_space_info(kobj->parent); 2936ab0a202SJeff Mahoney struct btrfs_block_group_cache *block_group; 29475cb379dSJeff Mahoney int index = btrfs_bg_flags_to_raid_index(to_raid_kobj(kobj)->flags); 2956ab0a202SJeff Mahoney u64 val = 0; 2966ab0a202SJeff Mahoney 2976ab0a202SJeff Mahoney down_read(&sinfo->groups_sem); 2986ab0a202SJeff Mahoney list_for_each_entry(block_group, &sinfo->block_groups[index], list) { 299a969f4ccSHans van Kranenburg if (&attr->attr == BTRFS_ATTR_PTR(raid, total_bytes)) 3006ab0a202SJeff Mahoney val += block_group->key.offset; 3016ab0a202SJeff Mahoney else 3026ab0a202SJeff Mahoney val += btrfs_block_group_used(&block_group->item); 3036ab0a202SJeff Mahoney } 3046ab0a202SJeff Mahoney up_read(&sinfo->groups_sem); 3056ab0a202SJeff Mahoney return snprintf(buf, PAGE_SIZE, "%llu\n", val); 3066ab0a202SJeff Mahoney } 3076ab0a202SJeff Mahoney 3087c7e3014SKimberly Brown static struct attribute *raid_attrs[] = { 309a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(raid, total_bytes), 310a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(raid, used_bytes), 3116ab0a202SJeff Mahoney NULL 3126ab0a202SJeff Mahoney }; 3137c7e3014SKimberly Brown ATTRIBUTE_GROUPS(raid); 3146ab0a202SJeff Mahoney 3156ab0a202SJeff Mahoney static void release_raid_kobj(struct kobject *kobj) 3166ab0a202SJeff Mahoney { 317c1895442SJeff Mahoney kfree(to_raid_kobj(kobj)); 3186ab0a202SJeff Mahoney } 3196ab0a202SJeff Mahoney 3206ab0a202SJeff Mahoney struct kobj_type btrfs_raid_ktype = { 3216ab0a202SJeff Mahoney .sysfs_ops = &kobj_sysfs_ops, 3226ab0a202SJeff Mahoney .release = release_raid_kobj, 3237c7e3014SKimberly Brown .default_groups = raid_groups, 3246ab0a202SJeff Mahoney }; 3256ab0a202SJeff Mahoney 3266ab0a202SJeff Mahoney #define SPACE_INFO_ATTR(field) \ 3276ab0a202SJeff Mahoney static ssize_t btrfs_space_info_show_##field(struct kobject *kobj, \ 3286ab0a202SJeff Mahoney struct kobj_attribute *a, \ 3296ab0a202SJeff Mahoney char *buf) \ 3306ab0a202SJeff Mahoney { \ 3316ab0a202SJeff Mahoney struct btrfs_space_info *sinfo = to_space_info(kobj); \ 3326ab0a202SJeff Mahoney return btrfs_show_u64(&sinfo->field, &sinfo->lock, buf); \ 3336ab0a202SJeff Mahoney } \ 334a969f4ccSHans van Kranenburg BTRFS_ATTR(space_info, field, btrfs_space_info_show_##field) 3356ab0a202SJeff Mahoney 3366ab0a202SJeff Mahoney static ssize_t btrfs_space_info_show_total_bytes_pinned(struct kobject *kobj, 3376ab0a202SJeff Mahoney struct kobj_attribute *a, 3386ab0a202SJeff Mahoney char *buf) 3396ab0a202SJeff Mahoney { 3406ab0a202SJeff Mahoney struct btrfs_space_info *sinfo = to_space_info(kobj); 3416ab0a202SJeff Mahoney s64 val = percpu_counter_sum(&sinfo->total_bytes_pinned); 3426ab0a202SJeff Mahoney return snprintf(buf, PAGE_SIZE, "%lld\n", val); 3436ab0a202SJeff Mahoney } 3446ab0a202SJeff Mahoney 3456ab0a202SJeff Mahoney SPACE_INFO_ATTR(flags); 3466ab0a202SJeff Mahoney SPACE_INFO_ATTR(total_bytes); 3476ab0a202SJeff Mahoney SPACE_INFO_ATTR(bytes_used); 3486ab0a202SJeff Mahoney SPACE_INFO_ATTR(bytes_pinned); 3496ab0a202SJeff Mahoney SPACE_INFO_ATTR(bytes_reserved); 3506ab0a202SJeff Mahoney SPACE_INFO_ATTR(bytes_may_use); 351c1fd5c30SWang Xiaoguang SPACE_INFO_ATTR(bytes_readonly); 3526ab0a202SJeff Mahoney SPACE_INFO_ATTR(disk_used); 3536ab0a202SJeff Mahoney SPACE_INFO_ATTR(disk_total); 354a969f4ccSHans van Kranenburg BTRFS_ATTR(space_info, total_bytes_pinned, 355a969f4ccSHans van Kranenburg btrfs_space_info_show_total_bytes_pinned); 3566ab0a202SJeff Mahoney 3576ab0a202SJeff Mahoney static struct attribute *space_info_attrs[] = { 358a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, flags), 359a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, total_bytes), 360a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, bytes_used), 361a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, bytes_pinned), 362a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, bytes_reserved), 363a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, bytes_may_use), 364a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, bytes_readonly), 365a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, disk_used), 366a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, disk_total), 367a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, total_bytes_pinned), 3686ab0a202SJeff Mahoney NULL, 3696ab0a202SJeff Mahoney }; 3707c7e3014SKimberly Brown ATTRIBUTE_GROUPS(space_info); 3716ab0a202SJeff Mahoney 3726ab0a202SJeff Mahoney static void space_info_release(struct kobject *kobj) 3736ab0a202SJeff Mahoney { 3746ab0a202SJeff Mahoney struct btrfs_space_info *sinfo = to_space_info(kobj); 3756ab0a202SJeff Mahoney percpu_counter_destroy(&sinfo->total_bytes_pinned); 3766ab0a202SJeff Mahoney kfree(sinfo); 3776ab0a202SJeff Mahoney } 3786ab0a202SJeff Mahoney 3796ab0a202SJeff Mahoney struct kobj_type space_info_ktype = { 3806ab0a202SJeff Mahoney .sysfs_ops = &kobj_sysfs_ops, 3816ab0a202SJeff Mahoney .release = space_info_release, 3827c7e3014SKimberly Brown .default_groups = space_info_groups, 3836ab0a202SJeff Mahoney }; 3846ab0a202SJeff Mahoney 3856ab0a202SJeff Mahoney static const struct attribute *allocation_attrs[] = { 386a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(allocation, global_rsv_reserved), 387a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(allocation, global_rsv_size), 3886ab0a202SJeff Mahoney NULL, 3896ab0a202SJeff Mahoney }; 3906ab0a202SJeff Mahoney 391f8ba9c11SJeff Mahoney static ssize_t btrfs_label_show(struct kobject *kobj, 392f8ba9c11SJeff Mahoney struct kobj_attribute *a, char *buf) 393f8ba9c11SJeff Mahoney { 394f8ba9c11SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj); 39548fcc3ffSSatoru Takeuchi char *label = fs_info->super_copy->label; 396ee17fc80SDavid Sterba ssize_t ret; 397ee17fc80SDavid Sterba 398ee17fc80SDavid Sterba spin_lock(&fs_info->super_lock); 399ee17fc80SDavid Sterba ret = snprintf(buf, PAGE_SIZE, label[0] ? "%s\n" : "%s", label); 400ee17fc80SDavid Sterba spin_unlock(&fs_info->super_lock); 401ee17fc80SDavid Sterba 402ee17fc80SDavid Sterba return ret; 403f8ba9c11SJeff Mahoney } 404f8ba9c11SJeff Mahoney 405f8ba9c11SJeff Mahoney static ssize_t btrfs_label_store(struct kobject *kobj, 406f8ba9c11SJeff Mahoney struct kobj_attribute *a, 407f8ba9c11SJeff Mahoney const char *buf, size_t len) 408f8ba9c11SJeff Mahoney { 409f8ba9c11SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj); 41048fcc3ffSSatoru Takeuchi size_t p_len; 411f8ba9c11SJeff Mahoney 41266ac9fe7SDavid Sterba if (!fs_info) 41366ac9fe7SDavid Sterba return -EPERM; 41466ac9fe7SDavid Sterba 415bc98a42cSDavid Howells if (sb_rdonly(fs_info->sb)) 41679aec2b8SAnand Jain return -EROFS; 41779aec2b8SAnand Jain 41848fcc3ffSSatoru Takeuchi /* 41948fcc3ffSSatoru Takeuchi * p_len is the len until the first occurrence of either 42048fcc3ffSSatoru Takeuchi * '\n' or '\0' 42148fcc3ffSSatoru Takeuchi */ 42248fcc3ffSSatoru Takeuchi p_len = strcspn(buf, "\n"); 42348fcc3ffSSatoru Takeuchi 42448fcc3ffSSatoru Takeuchi if (p_len >= BTRFS_LABEL_SIZE) 425f8ba9c11SJeff Mahoney return -EINVAL; 426f8ba9c11SJeff Mahoney 427a6f69dc8SDavid Sterba spin_lock(&fs_info->super_lock); 42848fcc3ffSSatoru Takeuchi memset(fs_info->super_copy->label, 0, BTRFS_LABEL_SIZE); 42948fcc3ffSSatoru Takeuchi memcpy(fs_info->super_copy->label, buf, p_len); 430a6f69dc8SDavid Sterba spin_unlock(&fs_info->super_lock); 431f8ba9c11SJeff Mahoney 432a6f69dc8SDavid Sterba /* 433a6f69dc8SDavid Sterba * We don't want to do full transaction commit from inside sysfs 434a6f69dc8SDavid Sterba */ 435a6f69dc8SDavid Sterba btrfs_set_pending(fs_info, COMMIT); 436a6f69dc8SDavid Sterba wake_up_process(fs_info->transaction_kthread); 437a6f69dc8SDavid Sterba 438f8ba9c11SJeff Mahoney return len; 439f8ba9c11SJeff Mahoney } 440a969f4ccSHans van Kranenburg BTRFS_ATTR_RW(, label, btrfs_label_show, btrfs_label_store); 441f8ba9c11SJeff Mahoney 442df93589aSDavid Sterba static ssize_t btrfs_nodesize_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", fs_info->super_copy->nodesize); 448df93589aSDavid Sterba } 449df93589aSDavid Sterba 450a969f4ccSHans van Kranenburg BTRFS_ATTR(, nodesize, btrfs_nodesize_show); 451df93589aSDavid Sterba 452df93589aSDavid Sterba static ssize_t btrfs_sectorsize_show(struct kobject *kobj, 453df93589aSDavid Sterba struct kobj_attribute *a, char *buf) 454df93589aSDavid Sterba { 455df93589aSDavid Sterba struct btrfs_fs_info *fs_info = to_fs_info(kobj); 456df93589aSDavid Sterba 457093e037cSDavid Sterba return snprintf(buf, PAGE_SIZE, "%u\n", 458093e037cSDavid Sterba fs_info->super_copy->sectorsize); 459df93589aSDavid Sterba } 460df93589aSDavid Sterba 461a969f4ccSHans van Kranenburg BTRFS_ATTR(, sectorsize, btrfs_sectorsize_show); 462df93589aSDavid Sterba 463df93589aSDavid Sterba static ssize_t btrfs_clone_alignment_show(struct kobject *kobj, 464df93589aSDavid Sterba struct kobj_attribute *a, char *buf) 465df93589aSDavid Sterba { 466df93589aSDavid Sterba struct btrfs_fs_info *fs_info = to_fs_info(kobj); 467df93589aSDavid Sterba 468093e037cSDavid Sterba return snprintf(buf, PAGE_SIZE, "%u\n", 469093e037cSDavid Sterba fs_info->super_copy->sectorsize); 470df93589aSDavid Sterba } 471df93589aSDavid Sterba 472a969f4ccSHans van Kranenburg BTRFS_ATTR(, clone_alignment, btrfs_clone_alignment_show); 473df93589aSDavid Sterba 4742723480aSSargun Dhillon static ssize_t quota_override_show(struct kobject *kobj, 4752723480aSSargun Dhillon struct kobj_attribute *a, char *buf) 4762723480aSSargun Dhillon { 4772723480aSSargun Dhillon struct btrfs_fs_info *fs_info = to_fs_info(kobj); 4782723480aSSargun Dhillon int quota_override; 4792723480aSSargun Dhillon 4802723480aSSargun Dhillon quota_override = test_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags); 4812723480aSSargun Dhillon return snprintf(buf, PAGE_SIZE, "%d\n", quota_override); 4822723480aSSargun Dhillon } 4832723480aSSargun Dhillon 4842723480aSSargun Dhillon static ssize_t quota_override_store(struct kobject *kobj, 4852723480aSSargun Dhillon struct kobj_attribute *a, 4862723480aSSargun Dhillon const char *buf, size_t len) 4872723480aSSargun Dhillon { 4882723480aSSargun Dhillon struct btrfs_fs_info *fs_info = to_fs_info(kobj); 4892723480aSSargun Dhillon unsigned long knob; 4902723480aSSargun Dhillon int err; 4912723480aSSargun Dhillon 4922723480aSSargun Dhillon if (!fs_info) 4932723480aSSargun Dhillon return -EPERM; 4942723480aSSargun Dhillon 4952723480aSSargun Dhillon if (!capable(CAP_SYS_RESOURCE)) 4962723480aSSargun Dhillon return -EPERM; 4972723480aSSargun Dhillon 4982723480aSSargun Dhillon err = kstrtoul(buf, 10, &knob); 4992723480aSSargun Dhillon if (err) 5002723480aSSargun Dhillon return err; 5012723480aSSargun Dhillon if (knob > 1) 5022723480aSSargun Dhillon return -EINVAL; 5032723480aSSargun Dhillon 5042723480aSSargun Dhillon if (knob) 5052723480aSSargun Dhillon set_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags); 5062723480aSSargun Dhillon else 5072723480aSSargun Dhillon clear_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags); 5082723480aSSargun Dhillon 5092723480aSSargun Dhillon return len; 5102723480aSSargun Dhillon } 5112723480aSSargun Dhillon 512a969f4ccSHans van Kranenburg BTRFS_ATTR_RW(, quota_override, quota_override_show, quota_override_store); 5132723480aSSargun Dhillon 51456f20f40SNikolay Borisov static ssize_t btrfs_metadata_uuid_show(struct kobject *kobj, 51556f20f40SNikolay Borisov struct kobj_attribute *a, char *buf) 51656f20f40SNikolay Borisov { 51756f20f40SNikolay Borisov struct btrfs_fs_info *fs_info = to_fs_info(kobj); 51856f20f40SNikolay Borisov 51956f20f40SNikolay Borisov return snprintf(buf, PAGE_SIZE, "%pU\n", 52056f20f40SNikolay Borisov fs_info->fs_devices->metadata_uuid); 52156f20f40SNikolay Borisov } 52256f20f40SNikolay Borisov 52356f20f40SNikolay Borisov BTRFS_ATTR(, metadata_uuid, btrfs_metadata_uuid_show); 52456f20f40SNikolay Borisov 5250dd2906fSAnand Jain static const struct attribute *btrfs_attrs[] = { 526a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(, label), 527a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(, nodesize), 528a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(, sectorsize), 529a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(, clone_alignment), 530a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(, quota_override), 53156f20f40SNikolay Borisov BTRFS_ATTR_PTR(, metadata_uuid), 532f8ba9c11SJeff Mahoney NULL, 533f8ba9c11SJeff Mahoney }; 534f8ba9c11SJeff Mahoney 535c1b7e474SAnand Jain static void btrfs_release_fsid_kobj(struct kobject *kobj) 536510d7360SJeff Mahoney { 5372e7910d6SAnand Jain struct btrfs_fs_devices *fs_devs = to_fs_devs(kobj); 538248d200dSAnand Jain 539c1b7e474SAnand Jain memset(&fs_devs->fsid_kobj, 0, sizeof(struct kobject)); 5402e7910d6SAnand Jain complete(&fs_devs->kobj_unregister); 541510d7360SJeff Mahoney } 542510d7360SJeff Mahoney 543510d7360SJeff Mahoney static struct kobj_type btrfs_ktype = { 544510d7360SJeff Mahoney .sysfs_ops = &kobj_sysfs_ops, 545c1b7e474SAnand Jain .release = btrfs_release_fsid_kobj, 546510d7360SJeff Mahoney }; 547510d7360SJeff Mahoney 5482e7910d6SAnand Jain static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj) 5492e7910d6SAnand Jain { 5502e7910d6SAnand Jain if (kobj->ktype != &btrfs_ktype) 5512e7910d6SAnand Jain return NULL; 552c1b7e474SAnand Jain return container_of(kobj, struct btrfs_fs_devices, fsid_kobj); 5532e7910d6SAnand Jain } 5542e7910d6SAnand Jain 555510d7360SJeff Mahoney static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj) 556510d7360SJeff Mahoney { 557510d7360SJeff Mahoney if (kobj->ktype != &btrfs_ktype) 558510d7360SJeff Mahoney return NULL; 5592e7910d6SAnand Jain return to_fs_devs(kobj)->fs_info; 560510d7360SJeff Mahoney } 56158176a96SJosef Bacik 562e453d989SJeff Mahoney #define NUM_FEATURE_BITS 64 5636c52157fSTomohiro Misono #define BTRFS_FEATURE_NAME_MAX 13 5646c52157fSTomohiro Misono static char btrfs_unknown_feature_names[FEAT_MAX][NUM_FEATURE_BITS][BTRFS_FEATURE_NAME_MAX]; 5656c52157fSTomohiro Misono static struct btrfs_feature_attr btrfs_feature_attrs[FEAT_MAX][NUM_FEATURE_BITS]; 566e453d989SJeff Mahoney 5676c52157fSTomohiro Misono static const u64 supported_feature_masks[FEAT_MAX] = { 568e453d989SJeff Mahoney [FEAT_COMPAT] = BTRFS_FEATURE_COMPAT_SUPP, 569e453d989SJeff Mahoney [FEAT_COMPAT_RO] = BTRFS_FEATURE_COMPAT_RO_SUPP, 570e453d989SJeff Mahoney [FEAT_INCOMPAT] = BTRFS_FEATURE_INCOMPAT_SUPP, 571e453d989SJeff Mahoney }; 572e453d989SJeff Mahoney 573e453d989SJeff Mahoney static int addrm_unknown_feature_attrs(struct btrfs_fs_info *fs_info, bool add) 5745ac1d209SJeff Mahoney { 575e453d989SJeff Mahoney int set; 576e453d989SJeff Mahoney 577e453d989SJeff Mahoney for (set = 0; set < FEAT_MAX; set++) { 578e453d989SJeff Mahoney int i; 579e453d989SJeff Mahoney struct attribute *attrs[2]; 580e453d989SJeff Mahoney struct attribute_group agroup = { 581e453d989SJeff Mahoney .name = "features", 582e453d989SJeff Mahoney .attrs = attrs, 583e453d989SJeff Mahoney }; 584e453d989SJeff Mahoney u64 features = get_features(fs_info, set); 585e453d989SJeff Mahoney features &= ~supported_feature_masks[set]; 586e453d989SJeff Mahoney 587e453d989SJeff Mahoney if (!features) 588e453d989SJeff Mahoney continue; 589e453d989SJeff Mahoney 590e453d989SJeff Mahoney attrs[1] = NULL; 591e453d989SJeff Mahoney for (i = 0; i < NUM_FEATURE_BITS; i++) { 592e453d989SJeff Mahoney struct btrfs_feature_attr *fa; 593e453d989SJeff Mahoney 594e453d989SJeff Mahoney if (!(features & (1ULL << i))) 595e453d989SJeff Mahoney continue; 596e453d989SJeff Mahoney 597e453d989SJeff Mahoney fa = &btrfs_feature_attrs[set][i]; 598e453d989SJeff Mahoney attrs[0] = &fa->kobj_attr.attr; 599e453d989SJeff Mahoney if (add) { 600e453d989SJeff Mahoney int ret; 601c1b7e474SAnand Jain ret = sysfs_merge_group(&fs_info->fs_devices->fsid_kobj, 602e453d989SJeff Mahoney &agroup); 603e453d989SJeff Mahoney if (ret) 604e453d989SJeff Mahoney return ret; 605e453d989SJeff Mahoney } else 606c1b7e474SAnand Jain sysfs_unmerge_group(&fs_info->fs_devices->fsid_kobj, 607e453d989SJeff Mahoney &agroup); 608e453d989SJeff Mahoney } 609e453d989SJeff Mahoney 610e453d989SJeff Mahoney } 611e453d989SJeff Mahoney return 0; 612e453d989SJeff Mahoney } 613e453d989SJeff Mahoney 6142e3e1281SAnand Jain static void __btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs) 615e453d989SJeff Mahoney { 6162e7910d6SAnand Jain if (fs_devs->device_dir_kobj) { 6172e7910d6SAnand Jain kobject_del(fs_devs->device_dir_kobj); 6182e7910d6SAnand Jain kobject_put(fs_devs->device_dir_kobj); 6192e7910d6SAnand Jain fs_devs->device_dir_kobj = NULL; 620aaf13305SAnand Jain } 621aaf13305SAnand Jain 622c1b7e474SAnand Jain if (fs_devs->fsid_kobj.state_initialized) { 623c1b7e474SAnand Jain kobject_del(&fs_devs->fsid_kobj); 624c1b7e474SAnand Jain kobject_put(&fs_devs->fsid_kobj); 6252e7910d6SAnand Jain wait_for_completion(&fs_devs->kobj_unregister); 6265ac1d209SJeff Mahoney } 627f90fc547SAnand Jain } 6285ac1d209SJeff Mahoney 6292e3e1281SAnand Jain /* when fs_devs is NULL it will remove all fsid kobject */ 6301d1c1be3SAnand Jain void btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs) 6312e3e1281SAnand Jain { 6322e3e1281SAnand Jain struct list_head *fs_uuids = btrfs_get_fs_uuids(); 6332e3e1281SAnand Jain 6342e3e1281SAnand Jain if (fs_devs) { 6352e3e1281SAnand Jain __btrfs_sysfs_remove_fsid(fs_devs); 6362e3e1281SAnand Jain return; 6372e3e1281SAnand Jain } 6382e3e1281SAnand Jain 639c4babc5eSAnand Jain list_for_each_entry(fs_devs, fs_uuids, fs_list) { 6402e3e1281SAnand Jain __btrfs_sysfs_remove_fsid(fs_devs); 6412e3e1281SAnand Jain } 6422e3e1281SAnand Jain } 6432e3e1281SAnand Jain 6446618a59bSAnand Jain void btrfs_sysfs_remove_mounted(struct btrfs_fs_info *fs_info) 645e453d989SJeff Mahoney { 6465a13f430SAnand Jain btrfs_reset_fs_info_ptr(fs_info); 6475a13f430SAnand Jain 648e453d989SJeff Mahoney if (fs_info->space_info_kobj) { 649e453d989SJeff Mahoney sysfs_remove_files(fs_info->space_info_kobj, allocation_attrs); 650e453d989SJeff Mahoney kobject_del(fs_info->space_info_kobj); 651e453d989SJeff Mahoney kobject_put(fs_info->space_info_kobj); 652e453d989SJeff Mahoney } 653e453d989SJeff Mahoney addrm_unknown_feature_attrs(fs_info, false); 654c1b7e474SAnand Jain sysfs_remove_group(&fs_info->fs_devices->fsid_kobj, &btrfs_feature_attr_group); 655c1b7e474SAnand Jain sysfs_remove_files(&fs_info->fs_devices->fsid_kobj, btrfs_attrs); 65632576040SAnand Jain btrfs_sysfs_rm_device_link(fs_info->fs_devices, NULL); 657e453d989SJeff Mahoney } 658e453d989SJeff Mahoney 6596c52157fSTomohiro Misono const char * const btrfs_feature_set_names[FEAT_MAX] = { 66079da4fa4SJeff Mahoney [FEAT_COMPAT] = "compat", 66179da4fa4SJeff Mahoney [FEAT_COMPAT_RO] = "compat_ro", 66279da4fa4SJeff Mahoney [FEAT_INCOMPAT] = "incompat", 66379da4fa4SJeff Mahoney }; 66479da4fa4SJeff Mahoney 6653b02a68aSJeff Mahoney char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags) 6663b02a68aSJeff Mahoney { 6673b02a68aSJeff Mahoney size_t bufsize = 4096; /* safe max, 64 names * 64 bytes */ 6683b02a68aSJeff Mahoney int len = 0; 6693b02a68aSJeff Mahoney int i; 6703b02a68aSJeff Mahoney char *str; 6713b02a68aSJeff Mahoney 6723b02a68aSJeff Mahoney str = kmalloc(bufsize, GFP_KERNEL); 6733b02a68aSJeff Mahoney if (!str) 6743b02a68aSJeff Mahoney return str; 6753b02a68aSJeff Mahoney 6763b02a68aSJeff Mahoney for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { 6773b02a68aSJeff Mahoney const char *name; 6783b02a68aSJeff Mahoney 6793b02a68aSJeff Mahoney if (!(flags & (1ULL << i))) 6803b02a68aSJeff Mahoney continue; 6813b02a68aSJeff Mahoney 6823b02a68aSJeff Mahoney name = btrfs_feature_attrs[set][i].kobj_attr.attr.name; 6833b02a68aSJeff Mahoney len += snprintf(str + len, bufsize - len, "%s%s", 6843b02a68aSJeff Mahoney len ? "," : "", name); 6853b02a68aSJeff Mahoney } 6863b02a68aSJeff Mahoney 6873b02a68aSJeff Mahoney return str; 6883b02a68aSJeff Mahoney } 6893b02a68aSJeff Mahoney 69079da4fa4SJeff Mahoney static void init_feature_attrs(void) 69179da4fa4SJeff Mahoney { 69279da4fa4SJeff Mahoney struct btrfs_feature_attr *fa; 69379da4fa4SJeff Mahoney int set, i; 69479da4fa4SJeff Mahoney 69579da4fa4SJeff Mahoney BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names) != 69679da4fa4SJeff Mahoney ARRAY_SIZE(btrfs_feature_attrs)); 69779da4fa4SJeff Mahoney BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names[0]) != 69879da4fa4SJeff Mahoney ARRAY_SIZE(btrfs_feature_attrs[0])); 69979da4fa4SJeff Mahoney 7003b02a68aSJeff Mahoney memset(btrfs_feature_attrs, 0, sizeof(btrfs_feature_attrs)); 7013b02a68aSJeff Mahoney memset(btrfs_unknown_feature_names, 0, 7023b02a68aSJeff Mahoney sizeof(btrfs_unknown_feature_names)); 7033b02a68aSJeff Mahoney 70479da4fa4SJeff Mahoney for (i = 0; btrfs_supported_feature_attrs[i]; i++) { 70579da4fa4SJeff Mahoney struct btrfs_feature_attr *sfa; 70679da4fa4SJeff Mahoney struct attribute *a = btrfs_supported_feature_attrs[i]; 7073b02a68aSJeff Mahoney int bit; 70879da4fa4SJeff Mahoney sfa = attr_to_btrfs_feature_attr(a); 7093b02a68aSJeff Mahoney bit = ilog2(sfa->feature_bit); 7103b02a68aSJeff Mahoney fa = &btrfs_feature_attrs[sfa->feature_set][bit]; 71179da4fa4SJeff Mahoney 71279da4fa4SJeff Mahoney fa->kobj_attr.attr.name = sfa->kobj_attr.attr.name; 71379da4fa4SJeff Mahoney } 71479da4fa4SJeff Mahoney 71579da4fa4SJeff Mahoney for (set = 0; set < FEAT_MAX; set++) { 71679da4fa4SJeff Mahoney for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { 71779da4fa4SJeff Mahoney char *name = btrfs_unknown_feature_names[set][i]; 71879da4fa4SJeff Mahoney fa = &btrfs_feature_attrs[set][i]; 71979da4fa4SJeff Mahoney 72079da4fa4SJeff Mahoney if (fa->kobj_attr.attr.name) 72179da4fa4SJeff Mahoney continue; 72279da4fa4SJeff Mahoney 7236c52157fSTomohiro Misono snprintf(name, BTRFS_FEATURE_NAME_MAX, "%s:%u", 72479da4fa4SJeff Mahoney btrfs_feature_set_names[set], i); 72579da4fa4SJeff Mahoney 72679da4fa4SJeff Mahoney fa->kobj_attr.attr.name = name; 72779da4fa4SJeff Mahoney fa->kobj_attr.attr.mode = S_IRUGO; 72879da4fa4SJeff Mahoney fa->feature_set = set; 72979da4fa4SJeff Mahoney fa->feature_bit = 1ULL << i; 73079da4fa4SJeff Mahoney } 73179da4fa4SJeff Mahoney } 73279da4fa4SJeff Mahoney } 73379da4fa4SJeff Mahoney 734e7e1aa9cSAnand Jain /* when one_device is NULL, it removes all device links */ 735e7e1aa9cSAnand Jain 73632576040SAnand Jain int btrfs_sysfs_rm_device_link(struct btrfs_fs_devices *fs_devices, 73799994cdeSAnand Jain struct btrfs_device *one_device) 73899994cdeSAnand Jain { 73999994cdeSAnand Jain struct hd_struct *disk; 74099994cdeSAnand Jain struct kobject *disk_kobj; 74199994cdeSAnand Jain 7426c14a164SAnand Jain if (!fs_devices->device_dir_kobj) 74399994cdeSAnand Jain return -EINVAL; 74499994cdeSAnand Jain 74587fa3bb0SLiu Bo if (one_device && one_device->bdev) { 74699994cdeSAnand Jain disk = one_device->bdev->bd_part; 74799994cdeSAnand Jain disk_kobj = &part_to_dev(disk)->kobj; 74899994cdeSAnand Jain 7496c14a164SAnand Jain sysfs_remove_link(fs_devices->device_dir_kobj, 75099994cdeSAnand Jain disk_kobj->name); 75199994cdeSAnand Jain } 75299994cdeSAnand Jain 753e7e1aa9cSAnand Jain if (one_device) 754e7e1aa9cSAnand Jain return 0; 755e7e1aa9cSAnand Jain 756e7e1aa9cSAnand Jain list_for_each_entry(one_device, 7576c14a164SAnand Jain &fs_devices->devices, dev_list) { 758e7e1aa9cSAnand Jain if (!one_device->bdev) 759e7e1aa9cSAnand Jain continue; 760e7e1aa9cSAnand Jain disk = one_device->bdev->bd_part; 761e7e1aa9cSAnand Jain disk_kobj = &part_to_dev(disk)->kobj; 762e7e1aa9cSAnand Jain 7636c14a164SAnand Jain sysfs_remove_link(fs_devices->device_dir_kobj, 764e7e1aa9cSAnand Jain disk_kobj->name); 765e7e1aa9cSAnand Jain } 766e7e1aa9cSAnand Jain 76799994cdeSAnand Jain return 0; 76899994cdeSAnand Jain } 76999994cdeSAnand Jain 7702e7910d6SAnand Jain int btrfs_sysfs_add_device(struct btrfs_fs_devices *fs_devs) 77100c921c2SAnand Jain { 7722e7910d6SAnand Jain if (!fs_devs->device_dir_kobj) 7732e7910d6SAnand Jain fs_devs->device_dir_kobj = kobject_create_and_add("devices", 774c1b7e474SAnand Jain &fs_devs->fsid_kobj); 77500c921c2SAnand Jain 7762e7910d6SAnand Jain if (!fs_devs->device_dir_kobj) 77700c921c2SAnand Jain return -ENOMEM; 77800c921c2SAnand Jain 77900c921c2SAnand Jain return 0; 78000c921c2SAnand Jain } 78100c921c2SAnand Jain 782e3bd6973SAnand Jain int btrfs_sysfs_add_device_link(struct btrfs_fs_devices *fs_devices, 7830d39376aSAnand Jain struct btrfs_device *one_device) 78429e5be24SJeff Mahoney { 78529e5be24SJeff Mahoney int error = 0; 78629e5be24SJeff Mahoney struct btrfs_device *dev; 78729e5be24SJeff Mahoney 78829e5be24SJeff Mahoney list_for_each_entry(dev, &fs_devices->devices, dev_list) { 789f085381eSAnand Jain struct hd_struct *disk; 790f085381eSAnand Jain struct kobject *disk_kobj; 791f085381eSAnand Jain 792f085381eSAnand Jain if (!dev->bdev) 793f085381eSAnand Jain continue; 794f085381eSAnand Jain 7950d39376aSAnand Jain if (one_device && one_device != dev) 7960d39376aSAnand Jain continue; 7970d39376aSAnand Jain 798f085381eSAnand Jain disk = dev->bdev->bd_part; 799f085381eSAnand Jain disk_kobj = &part_to_dev(disk)->kobj; 80029e5be24SJeff Mahoney 8012e7910d6SAnand Jain error = sysfs_create_link(fs_devices->device_dir_kobj, 80229e5be24SJeff Mahoney disk_kobj, disk_kobj->name); 80329e5be24SJeff Mahoney if (error) 80429e5be24SJeff Mahoney break; 80529e5be24SJeff Mahoney } 80629e5be24SJeff Mahoney 80729e5be24SJeff Mahoney return error; 80829e5be24SJeff Mahoney } 80929e5be24SJeff Mahoney 810510d7360SJeff Mahoney /* /sys/fs/btrfs/ entry */ 811510d7360SJeff Mahoney static struct kset *btrfs_kset; 812510d7360SJeff Mahoney 8131bae3098SDavid Sterba /* /sys/kernel/debug/btrfs */ 8141bae3098SDavid Sterba static struct dentry *btrfs_debugfs_root_dentry; 8151bae3098SDavid Sterba 8161bae3098SDavid Sterba /* Debugging tunables and exported data */ 8171bae3098SDavid Sterba u64 btrfs_debugfs_test; 8181bae3098SDavid Sterba 81972059215SAnand Jain /* 82072059215SAnand Jain * Can be called by the device discovery thread. 82172059215SAnand Jain * And parent can be specified for seed device 82272059215SAnand Jain */ 8230c10e2d4SAnand Jain int btrfs_sysfs_add_fsid(struct btrfs_fs_devices *fs_devs, 82472059215SAnand Jain struct kobject *parent) 8255ac1d209SJeff Mahoney { 8265ac1d209SJeff Mahoney int error; 8275ac1d209SJeff Mahoney 8282e7910d6SAnand Jain init_completion(&fs_devs->kobj_unregister); 829c1b7e474SAnand Jain fs_devs->fsid_kobj.kset = btrfs_kset; 830c1b7e474SAnand Jain error = kobject_init_and_add(&fs_devs->fsid_kobj, 83124bd69cbSAnand Jain &btrfs_ktype, parent, "%pU", fs_devs->fsid); 832e3277335STobin C. Harding if (error) { 833e3277335STobin C. Harding kobject_put(&fs_devs->fsid_kobj); 83472059215SAnand Jain return error; 83572059215SAnand Jain } 83672059215SAnand Jain 837e3277335STobin C. Harding return 0; 838e3277335STobin C. Harding } 839e3277335STobin C. Harding 84096f3136eSAnand Jain int btrfs_sysfs_add_mounted(struct btrfs_fs_info *fs_info) 84172059215SAnand Jain { 84272059215SAnand Jain int error; 8432e7910d6SAnand Jain struct btrfs_fs_devices *fs_devs = fs_info->fs_devices; 844c1b7e474SAnand Jain struct kobject *fsid_kobj = &fs_devs->fsid_kobj; 84572059215SAnand Jain 8465a13f430SAnand Jain btrfs_set_fs_info_ptr(fs_info); 8475a13f430SAnand Jain 848e3bd6973SAnand Jain error = btrfs_sysfs_add_device_link(fs_devs, NULL); 849e453d989SJeff Mahoney if (error) 850e453d989SJeff Mahoney return error; 851510d7360SJeff Mahoney 852c1b7e474SAnand Jain error = sysfs_create_files(fsid_kobj, btrfs_attrs); 853e453d989SJeff Mahoney if (error) { 85432576040SAnand Jain btrfs_sysfs_rm_device_link(fs_devs, NULL); 855e453d989SJeff Mahoney return error; 856e453d989SJeff Mahoney } 85779da4fa4SJeff Mahoney 858c1b7e474SAnand Jain error = sysfs_create_group(fsid_kobj, 8590dd2906fSAnand Jain &btrfs_feature_attr_group); 8600dd2906fSAnand Jain if (error) 8610dd2906fSAnand Jain goto failure; 8620dd2906fSAnand Jain 863e453d989SJeff Mahoney error = addrm_unknown_feature_attrs(fs_info, true); 86479da4fa4SJeff Mahoney if (error) 86579da4fa4SJeff Mahoney goto failure; 86679da4fa4SJeff Mahoney 8676ab0a202SJeff Mahoney fs_info->space_info_kobj = kobject_create_and_add("allocation", 868c1b7e474SAnand Jain fsid_kobj); 8696ab0a202SJeff Mahoney if (!fs_info->space_info_kobj) { 8706ab0a202SJeff Mahoney error = -ENOMEM; 8716ab0a202SJeff Mahoney goto failure; 8726ab0a202SJeff Mahoney } 8736ab0a202SJeff Mahoney 8746ab0a202SJeff Mahoney error = sysfs_create_files(fs_info->space_info_kobj, allocation_attrs); 8756ab0a202SJeff Mahoney if (error) 8766ab0a202SJeff Mahoney goto failure; 8776ab0a202SJeff Mahoney 87879da4fa4SJeff Mahoney return 0; 87979da4fa4SJeff Mahoney failure: 8806618a59bSAnand Jain btrfs_sysfs_remove_mounted(fs_info); 8815ac1d209SJeff Mahoney return error; 8825ac1d209SJeff Mahoney } 8835ac1d209SJeff Mahoney 884444e7516SDavid Sterba 885444e7516SDavid Sterba /* 886444e7516SDavid Sterba * Change per-fs features in /sys/fs/btrfs/UUID/features to match current 887444e7516SDavid Sterba * values in superblock. Call after any changes to incompat/compat_ro flags 888444e7516SDavid Sterba */ 889444e7516SDavid Sterba void btrfs_sysfs_feature_update(struct btrfs_fs_info *fs_info, 890444e7516SDavid Sterba u64 bit, enum btrfs_feature_set set) 891444e7516SDavid Sterba { 892444e7516SDavid Sterba struct btrfs_fs_devices *fs_devs; 893444e7516SDavid Sterba struct kobject *fsid_kobj; 894444e7516SDavid Sterba u64 features; 895444e7516SDavid Sterba int ret; 896444e7516SDavid Sterba 897444e7516SDavid Sterba if (!fs_info) 898444e7516SDavid Sterba return; 899444e7516SDavid Sterba 900444e7516SDavid Sterba features = get_features(fs_info, set); 901444e7516SDavid Sterba ASSERT(bit & supported_feature_masks[set]); 902444e7516SDavid Sterba 903444e7516SDavid Sterba fs_devs = fs_info->fs_devices; 904444e7516SDavid Sterba fsid_kobj = &fs_devs->fsid_kobj; 905444e7516SDavid Sterba 906bf609206SDavid Sterba if (!fsid_kobj->state_initialized) 907bf609206SDavid Sterba return; 908bf609206SDavid Sterba 909444e7516SDavid Sterba /* 910444e7516SDavid Sterba * FIXME: this is too heavy to update just one value, ideally we'd like 911444e7516SDavid Sterba * to use sysfs_update_group but some refactoring is needed first. 912444e7516SDavid Sterba */ 913444e7516SDavid Sterba sysfs_remove_group(fsid_kobj, &btrfs_feature_attr_group); 914444e7516SDavid Sterba ret = sysfs_create_group(fsid_kobj, &btrfs_feature_attr_group); 915444e7516SDavid Sterba } 916444e7516SDavid Sterba 91736b7ee4dSGreg Kroah-Hartman static void btrfs_init_debugfs(void) 9181bae3098SDavid Sterba { 9191bae3098SDavid Sterba #ifdef CONFIG_DEBUG_FS 9201bae3098SDavid Sterba btrfs_debugfs_root_dentry = debugfs_create_dir("btrfs", NULL); 9211bae3098SDavid Sterba 922b0de6c4cSDavid Sterba /* 923b0de6c4cSDavid Sterba * Example code, how to export data through debugfs. 924b0de6c4cSDavid Sterba * 925b0de6c4cSDavid Sterba * file: /sys/kernel/debug/btrfs/test 926b0de6c4cSDavid Sterba * contents of: btrfs_debugfs_test 927b0de6c4cSDavid Sterba */ 928b0de6c4cSDavid Sterba #ifdef CONFIG_BTRFS_DEBUG 92907f6a480SEric Sandeen debugfs_create_u64("test", S_IRUGO | S_IWUSR, btrfs_debugfs_root_dentry, 9301bae3098SDavid Sterba &btrfs_debugfs_test); 9311bae3098SDavid Sterba #endif 932b0de6c4cSDavid Sterba 933b0de6c4cSDavid Sterba #endif 9341bae3098SDavid Sterba } 9351bae3098SDavid Sterba 936f5c29bd9SLiu Bo int __init btrfs_init_sysfs(void) 93758176a96SJosef Bacik { 938079b72bcSJeff Mahoney int ret; 9391bae3098SDavid Sterba 940e3fe4e71SGreg KH btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj); 941e3fe4e71SGreg KH if (!btrfs_kset) 942e3fe4e71SGreg KH return -ENOMEM; 943079b72bcSJeff Mahoney 94436b7ee4dSGreg Kroah-Hartman btrfs_init_debugfs(); 945079b72bcSJeff Mahoney 9461bae3098SDavid Sterba init_feature_attrs(); 9471bae3098SDavid Sterba ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); 948001a648dSFilipe Manana if (ret) 949001a648dSFilipe Manana goto out2; 950f902bd3aSMisono Tomohiro ret = sysfs_merge_group(&btrfs_kset->kobj, 951f902bd3aSMisono Tomohiro &btrfs_static_feature_attr_group); 952f902bd3aSMisono Tomohiro if (ret) 953f902bd3aSMisono Tomohiro goto out_remove_group; 954001a648dSFilipe Manana 955001a648dSFilipe Manana return 0; 956f902bd3aSMisono Tomohiro 957f902bd3aSMisono Tomohiro out_remove_group: 958f902bd3aSMisono Tomohiro sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); 959001a648dSFilipe Manana out2: 960001a648dSFilipe Manana debugfs_remove_recursive(btrfs_debugfs_root_dentry); 961001a648dSFilipe Manana kset_unregister(btrfs_kset); 9621bae3098SDavid Sterba 9631bae3098SDavid Sterba return ret; 96458176a96SJosef Bacik } 96558176a96SJosef Bacik 966e67c718bSDavid Sterba void __cold btrfs_exit_sysfs(void) 96758176a96SJosef Bacik { 968f902bd3aSMisono Tomohiro sysfs_unmerge_group(&btrfs_kset->kobj, 969f902bd3aSMisono Tomohiro &btrfs_static_feature_attr_group); 970079b72bcSJeff Mahoney sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); 971e3fe4e71SGreg KH kset_unregister(btrfs_kset); 9721bae3098SDavid Sterba debugfs_remove_recursive(btrfs_debugfs_root_dentry); 97358176a96SJosef Bacik } 97455d47414SChris Mason 975