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" 19079b72bcSJeff Mahoney 20510d7360SJeff Mahoney static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj); 212e7910d6SAnand Jain static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj); 225ac1d209SJeff Mahoney 23510d7360SJeff Mahoney static u64 get_features(struct btrfs_fs_info *fs_info, 24510d7360SJeff Mahoney enum btrfs_feature_set set) 255ac1d209SJeff Mahoney { 26510d7360SJeff Mahoney struct btrfs_super_block *disk_super = fs_info->super_copy; 27510d7360SJeff Mahoney if (set == FEAT_COMPAT) 28510d7360SJeff Mahoney return btrfs_super_compat_flags(disk_super); 29510d7360SJeff Mahoney else if (set == FEAT_COMPAT_RO) 30510d7360SJeff Mahoney return btrfs_super_compat_ro_flags(disk_super); 31510d7360SJeff Mahoney else 32510d7360SJeff Mahoney return btrfs_super_incompat_flags(disk_super); 335ac1d209SJeff Mahoney } 345ac1d209SJeff Mahoney 35ba631941SJeff Mahoney static void set_features(struct btrfs_fs_info *fs_info, 36ba631941SJeff Mahoney enum btrfs_feature_set set, u64 features) 37ba631941SJeff Mahoney { 38ba631941SJeff Mahoney struct btrfs_super_block *disk_super = fs_info->super_copy; 39ba631941SJeff Mahoney if (set == FEAT_COMPAT) 40ba631941SJeff Mahoney btrfs_set_super_compat_flags(disk_super, features); 41ba631941SJeff Mahoney else if (set == FEAT_COMPAT_RO) 42ba631941SJeff Mahoney btrfs_set_super_compat_ro_flags(disk_super, features); 43ba631941SJeff Mahoney else 44ba631941SJeff Mahoney btrfs_set_super_incompat_flags(disk_super, features); 45ba631941SJeff Mahoney } 46ba631941SJeff Mahoney 47ba631941SJeff Mahoney static int can_modify_feature(struct btrfs_feature_attr *fa) 48ba631941SJeff Mahoney { 49ba631941SJeff Mahoney int val = 0; 50ba631941SJeff Mahoney u64 set, clear; 51ba631941SJeff Mahoney switch (fa->feature_set) { 52ba631941SJeff Mahoney case FEAT_COMPAT: 53ba631941SJeff Mahoney set = BTRFS_FEATURE_COMPAT_SAFE_SET; 54ba631941SJeff Mahoney clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR; 55ba631941SJeff Mahoney break; 56ba631941SJeff Mahoney case FEAT_COMPAT_RO: 57ba631941SJeff Mahoney set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET; 58ba631941SJeff Mahoney clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR; 59ba631941SJeff Mahoney break; 60ba631941SJeff Mahoney case FEAT_INCOMPAT: 61ba631941SJeff Mahoney set = BTRFS_FEATURE_INCOMPAT_SAFE_SET; 62ba631941SJeff Mahoney clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR; 63ba631941SJeff Mahoney break; 64ba631941SJeff Mahoney default: 6562e85577SJeff Mahoney pr_warn("btrfs: sysfs: unknown feature set %d\n", 66cc37bb04SDavid Sterba fa->feature_set); 67cc37bb04SDavid Sterba return 0; 68ba631941SJeff Mahoney } 69ba631941SJeff Mahoney 70ba631941SJeff Mahoney if (set & fa->feature_bit) 71ba631941SJeff Mahoney val |= 1; 72ba631941SJeff Mahoney if (clear & fa->feature_bit) 73ba631941SJeff Mahoney val |= 2; 74ba631941SJeff Mahoney 75ba631941SJeff Mahoney return val; 76ba631941SJeff Mahoney } 77ba631941SJeff Mahoney 78079b72bcSJeff Mahoney static ssize_t btrfs_feature_attr_show(struct kobject *kobj, 79079b72bcSJeff Mahoney struct kobj_attribute *a, char *buf) 80079b72bcSJeff Mahoney { 81510d7360SJeff Mahoney int val = 0; 82510d7360SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj); 83510d7360SJeff Mahoney struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a); 84ba631941SJeff Mahoney if (fs_info) { 85510d7360SJeff Mahoney u64 features = get_features(fs_info, fa->feature_set); 86510d7360SJeff Mahoney if (features & fa->feature_bit) 87510d7360SJeff Mahoney val = 1; 88ba631941SJeff Mahoney } else 89ba631941SJeff Mahoney val = can_modify_feature(fa); 90510d7360SJeff Mahoney 91510d7360SJeff Mahoney return snprintf(buf, PAGE_SIZE, "%d\n", val); 92510d7360SJeff Mahoney } 93510d7360SJeff Mahoney 94ba631941SJeff Mahoney static ssize_t btrfs_feature_attr_store(struct kobject *kobj, 95ba631941SJeff Mahoney struct kobj_attribute *a, 96ba631941SJeff Mahoney const char *buf, size_t count) 97ba631941SJeff Mahoney { 98ba631941SJeff Mahoney struct btrfs_fs_info *fs_info; 99ba631941SJeff Mahoney struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a); 100ba631941SJeff Mahoney u64 features, set, clear; 101ba631941SJeff Mahoney unsigned long val; 102ba631941SJeff Mahoney int ret; 103ba631941SJeff Mahoney 104ba631941SJeff Mahoney fs_info = to_fs_info(kobj); 105ba631941SJeff Mahoney if (!fs_info) 106ba631941SJeff Mahoney return -EPERM; 107ba631941SJeff Mahoney 108bc98a42cSDavid Howells if (sb_rdonly(fs_info->sb)) 109ee611138SDavid Sterba return -EROFS; 110ee611138SDavid Sterba 111ba631941SJeff Mahoney ret = kstrtoul(skip_spaces(buf), 0, &val); 112ba631941SJeff Mahoney if (ret) 113ba631941SJeff Mahoney return ret; 114ba631941SJeff Mahoney 115ba631941SJeff Mahoney if (fa->feature_set == FEAT_COMPAT) { 116ba631941SJeff Mahoney set = BTRFS_FEATURE_COMPAT_SAFE_SET; 117ba631941SJeff Mahoney clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR; 118ba631941SJeff Mahoney } else if (fa->feature_set == FEAT_COMPAT_RO) { 119ba631941SJeff Mahoney set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET; 120ba631941SJeff Mahoney clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR; 121ba631941SJeff Mahoney } else { 122ba631941SJeff Mahoney set = BTRFS_FEATURE_INCOMPAT_SAFE_SET; 123ba631941SJeff Mahoney clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR; 124ba631941SJeff Mahoney } 125ba631941SJeff Mahoney 126ba631941SJeff Mahoney features = get_features(fs_info, fa->feature_set); 127ba631941SJeff Mahoney 128ba631941SJeff Mahoney /* Nothing to do */ 129ba631941SJeff Mahoney if ((val && (features & fa->feature_bit)) || 130ba631941SJeff Mahoney (!val && !(features & fa->feature_bit))) 131ba631941SJeff Mahoney return count; 132ba631941SJeff Mahoney 133ba631941SJeff Mahoney if ((val && !(set & fa->feature_bit)) || 134ba631941SJeff Mahoney (!val && !(clear & fa->feature_bit))) { 135ba631941SJeff Mahoney btrfs_info(fs_info, 136ba631941SJeff Mahoney "%sabling feature %s on mounted fs is not supported.", 137ba631941SJeff Mahoney val ? "En" : "Dis", fa->kobj_attr.attr.name); 138ba631941SJeff Mahoney return -EPERM; 139ba631941SJeff Mahoney } 140ba631941SJeff Mahoney 141ba631941SJeff Mahoney btrfs_info(fs_info, "%s %s feature flag", 142ba631941SJeff Mahoney val ? "Setting" : "Clearing", fa->kobj_attr.attr.name); 143ba631941SJeff Mahoney 144ba631941SJeff Mahoney spin_lock(&fs_info->super_lock); 145ba631941SJeff Mahoney features = get_features(fs_info, fa->feature_set); 146ba631941SJeff Mahoney if (val) 147ba631941SJeff Mahoney features |= fa->feature_bit; 148ba631941SJeff Mahoney else 149ba631941SJeff Mahoney features &= ~fa->feature_bit; 150ba631941SJeff Mahoney set_features(fs_info, fa->feature_set, features); 151ba631941SJeff Mahoney spin_unlock(&fs_info->super_lock); 152ba631941SJeff Mahoney 1530eae2747SDavid Sterba /* 1540eae2747SDavid Sterba * We don't want to do full transaction commit from inside sysfs 1550eae2747SDavid Sterba */ 1560eae2747SDavid Sterba btrfs_set_pending(fs_info, COMMIT); 1570eae2747SDavid Sterba wake_up_process(fs_info->transaction_kthread); 158ba631941SJeff Mahoney 159ba631941SJeff Mahoney return count; 160ba631941SJeff Mahoney } 161ba631941SJeff Mahoney 162510d7360SJeff Mahoney static umode_t btrfs_feature_visible(struct kobject *kobj, 163510d7360SJeff Mahoney struct attribute *attr, int unused) 164510d7360SJeff Mahoney { 165510d7360SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj); 166510d7360SJeff Mahoney umode_t mode = attr->mode; 167510d7360SJeff Mahoney 168510d7360SJeff Mahoney if (fs_info) { 169510d7360SJeff Mahoney struct btrfs_feature_attr *fa; 170510d7360SJeff Mahoney u64 features; 171510d7360SJeff Mahoney 172510d7360SJeff Mahoney fa = attr_to_btrfs_feature_attr(attr); 173510d7360SJeff Mahoney features = get_features(fs_info, fa->feature_set); 174510d7360SJeff Mahoney 175ba631941SJeff Mahoney if (can_modify_feature(fa)) 176ba631941SJeff Mahoney mode |= S_IWUSR; 177ba631941SJeff Mahoney else if (!(features & fa->feature_bit)) 178510d7360SJeff Mahoney mode = 0; 179510d7360SJeff Mahoney } 180510d7360SJeff Mahoney 181510d7360SJeff Mahoney return mode; 182079b72bcSJeff Mahoney } 183079b72bcSJeff Mahoney 184079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(mixed_backref, MIXED_BACKREF); 185079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(default_subvol, DEFAULT_SUBVOL); 186079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(mixed_groups, MIXED_GROUPS); 187079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(compress_lzo, COMPRESS_LZO); 1885c1aab1dSNick Terrell BTRFS_FEAT_ATTR_INCOMPAT(compress_zstd, COMPRESS_ZSTD); 189079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(big_metadata, BIG_METADATA); 190079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(extended_iref, EXTENDED_IREF); 191079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(raid56, RAID56); 192079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(skinny_metadata, SKINNY_METADATA); 193c736c095SDavid Sterba BTRFS_FEAT_ATTR_INCOMPAT(no_holes, NO_HOLES); 19456f20f40SNikolay Borisov BTRFS_FEAT_ATTR_INCOMPAT(metadata_uuid, METADATA_UUID); 1953b5bb73bSDavid Sterba BTRFS_FEAT_ATTR_COMPAT_RO(free_space_tree, FREE_SPACE_TREE); 196079b72bcSJeff Mahoney 197079b72bcSJeff Mahoney static struct attribute *btrfs_supported_feature_attrs[] = { 198079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(mixed_backref), 199079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(default_subvol), 200079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(mixed_groups), 201079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(compress_lzo), 2025c1aab1dSNick Terrell BTRFS_FEAT_ATTR_PTR(compress_zstd), 203079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(big_metadata), 204079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(extended_iref), 205079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(raid56), 206079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(skinny_metadata), 207c736c095SDavid Sterba BTRFS_FEAT_ATTR_PTR(no_holes), 20856f20f40SNikolay Borisov BTRFS_FEAT_ATTR_PTR(metadata_uuid), 2093b5bb73bSDavid Sterba BTRFS_FEAT_ATTR_PTR(free_space_tree), 210079b72bcSJeff Mahoney NULL 211079b72bcSJeff Mahoney }; 212079b72bcSJeff Mahoney 213f902bd3aSMisono Tomohiro /* 214f902bd3aSMisono Tomohiro * Features which depend on feature bits and may differ between each fs. 215f902bd3aSMisono Tomohiro * 216f902bd3aSMisono Tomohiro * /sys/fs/btrfs/features lists all available features of this kernel while 217f902bd3aSMisono Tomohiro * /sys/fs/btrfs/UUID/features shows features of the fs which are enabled or 218f902bd3aSMisono Tomohiro * can be changed online. 219f902bd3aSMisono Tomohiro */ 220079b72bcSJeff Mahoney static const struct attribute_group btrfs_feature_attr_group = { 221079b72bcSJeff Mahoney .name = "features", 222510d7360SJeff Mahoney .is_visible = btrfs_feature_visible, 223079b72bcSJeff Mahoney .attrs = btrfs_supported_feature_attrs, 224079b72bcSJeff Mahoney }; 22558176a96SJosef Bacik 226f902bd3aSMisono Tomohiro static ssize_t rmdir_subvol_show(struct kobject *kobj, 227f902bd3aSMisono Tomohiro struct kobj_attribute *ka, char *buf) 228f902bd3aSMisono Tomohiro { 229f902bd3aSMisono Tomohiro return snprintf(buf, PAGE_SIZE, "0\n"); 230f902bd3aSMisono Tomohiro } 231f902bd3aSMisono Tomohiro BTRFS_ATTR(static_feature, rmdir_subvol, rmdir_subvol_show); 232f902bd3aSMisono Tomohiro 233f902bd3aSMisono Tomohiro static struct attribute *btrfs_supported_static_feature_attrs[] = { 234f902bd3aSMisono Tomohiro BTRFS_ATTR_PTR(static_feature, rmdir_subvol), 235f902bd3aSMisono Tomohiro NULL 236f902bd3aSMisono Tomohiro }; 237f902bd3aSMisono Tomohiro 238f902bd3aSMisono Tomohiro /* 239f902bd3aSMisono Tomohiro * Features which only depend on kernel version. 240f902bd3aSMisono Tomohiro * 241f902bd3aSMisono Tomohiro * These are listed in /sys/fs/btrfs/features along with 242f902bd3aSMisono Tomohiro * btrfs_feature_attr_group 243f902bd3aSMisono Tomohiro */ 244f902bd3aSMisono Tomohiro static const struct attribute_group btrfs_static_feature_attr_group = { 245f902bd3aSMisono Tomohiro .name = "features", 246f902bd3aSMisono Tomohiro .attrs = btrfs_supported_static_feature_attrs, 247f902bd3aSMisono Tomohiro }; 248f902bd3aSMisono Tomohiro 2496ab0a202SJeff Mahoney static ssize_t btrfs_show_u64(u64 *value_ptr, spinlock_t *lock, char *buf) 2506ab0a202SJeff Mahoney { 2516ab0a202SJeff Mahoney u64 val; 2526ab0a202SJeff Mahoney if (lock) 2536ab0a202SJeff Mahoney spin_lock(lock); 2546ab0a202SJeff Mahoney val = *value_ptr; 2556ab0a202SJeff Mahoney if (lock) 2566ab0a202SJeff Mahoney spin_unlock(lock); 2576ab0a202SJeff Mahoney return snprintf(buf, PAGE_SIZE, "%llu\n", val); 2586ab0a202SJeff Mahoney } 2596ab0a202SJeff Mahoney 2606ab0a202SJeff Mahoney static ssize_t global_rsv_size_show(struct kobject *kobj, 2616ab0a202SJeff Mahoney struct kobj_attribute *ka, char *buf) 2626ab0a202SJeff Mahoney { 2636ab0a202SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); 2646ab0a202SJeff Mahoney struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 2656ab0a202SJeff Mahoney return btrfs_show_u64(&block_rsv->size, &block_rsv->lock, buf); 2666ab0a202SJeff Mahoney } 267a969f4ccSHans van Kranenburg BTRFS_ATTR(allocation, global_rsv_size, global_rsv_size_show); 2686ab0a202SJeff Mahoney 2696ab0a202SJeff Mahoney static ssize_t global_rsv_reserved_show(struct kobject *kobj, 2706ab0a202SJeff Mahoney struct kobj_attribute *a, char *buf) 2716ab0a202SJeff Mahoney { 2726ab0a202SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); 2736ab0a202SJeff Mahoney struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 2746ab0a202SJeff Mahoney return btrfs_show_u64(&block_rsv->reserved, &block_rsv->lock, buf); 2756ab0a202SJeff Mahoney } 276a969f4ccSHans van Kranenburg BTRFS_ATTR(allocation, global_rsv_reserved, global_rsv_reserved_show); 2776ab0a202SJeff Mahoney 2786ab0a202SJeff Mahoney #define to_space_info(_kobj) container_of(_kobj, struct btrfs_space_info, kobj) 279c1895442SJeff Mahoney #define to_raid_kobj(_kobj) container_of(_kobj, struct raid_kobject, kobj) 2806ab0a202SJeff Mahoney 2816ab0a202SJeff Mahoney static ssize_t raid_bytes_show(struct kobject *kobj, 2826ab0a202SJeff Mahoney struct kobj_attribute *attr, char *buf); 283a969f4ccSHans van Kranenburg BTRFS_ATTR(raid, total_bytes, raid_bytes_show); 284a969f4ccSHans van Kranenburg BTRFS_ATTR(raid, used_bytes, raid_bytes_show); 2856ab0a202SJeff Mahoney 2866ab0a202SJeff Mahoney static ssize_t raid_bytes_show(struct kobject *kobj, 2876ab0a202SJeff Mahoney struct kobj_attribute *attr, char *buf) 2886ab0a202SJeff Mahoney 2896ab0a202SJeff Mahoney { 2906ab0a202SJeff Mahoney struct btrfs_space_info *sinfo = to_space_info(kobj->parent); 2916ab0a202SJeff Mahoney struct btrfs_block_group_cache *block_group; 29275cb379dSJeff Mahoney int index = btrfs_bg_flags_to_raid_index(to_raid_kobj(kobj)->flags); 2936ab0a202SJeff Mahoney u64 val = 0; 2946ab0a202SJeff Mahoney 2956ab0a202SJeff Mahoney down_read(&sinfo->groups_sem); 2966ab0a202SJeff Mahoney list_for_each_entry(block_group, &sinfo->block_groups[index], list) { 297a969f4ccSHans van Kranenburg if (&attr->attr == BTRFS_ATTR_PTR(raid, total_bytes)) 2986ab0a202SJeff Mahoney val += block_group->key.offset; 2996ab0a202SJeff Mahoney else 3006ab0a202SJeff Mahoney val += btrfs_block_group_used(&block_group->item); 3016ab0a202SJeff Mahoney } 3026ab0a202SJeff Mahoney up_read(&sinfo->groups_sem); 3036ab0a202SJeff Mahoney return snprintf(buf, PAGE_SIZE, "%llu\n", val); 3046ab0a202SJeff Mahoney } 3056ab0a202SJeff Mahoney 3067c7e3014SKimberly Brown static struct attribute *raid_attrs[] = { 307a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(raid, total_bytes), 308a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(raid, used_bytes), 3096ab0a202SJeff Mahoney NULL 3106ab0a202SJeff Mahoney }; 3117c7e3014SKimberly Brown ATTRIBUTE_GROUPS(raid); 3126ab0a202SJeff Mahoney 3136ab0a202SJeff Mahoney static void release_raid_kobj(struct kobject *kobj) 3146ab0a202SJeff Mahoney { 315c1895442SJeff Mahoney kfree(to_raid_kobj(kobj)); 3166ab0a202SJeff Mahoney } 3176ab0a202SJeff Mahoney 3186ab0a202SJeff Mahoney struct kobj_type btrfs_raid_ktype = { 3196ab0a202SJeff Mahoney .sysfs_ops = &kobj_sysfs_ops, 3206ab0a202SJeff Mahoney .release = release_raid_kobj, 3217c7e3014SKimberly Brown .default_groups = raid_groups, 3226ab0a202SJeff Mahoney }; 3236ab0a202SJeff Mahoney 3246ab0a202SJeff Mahoney #define SPACE_INFO_ATTR(field) \ 3256ab0a202SJeff Mahoney static ssize_t btrfs_space_info_show_##field(struct kobject *kobj, \ 3266ab0a202SJeff Mahoney struct kobj_attribute *a, \ 3276ab0a202SJeff Mahoney char *buf) \ 3286ab0a202SJeff Mahoney { \ 3296ab0a202SJeff Mahoney struct btrfs_space_info *sinfo = to_space_info(kobj); \ 3306ab0a202SJeff Mahoney return btrfs_show_u64(&sinfo->field, &sinfo->lock, buf); \ 3316ab0a202SJeff Mahoney } \ 332a969f4ccSHans van Kranenburg BTRFS_ATTR(space_info, field, btrfs_space_info_show_##field) 3336ab0a202SJeff Mahoney 3346ab0a202SJeff Mahoney static ssize_t btrfs_space_info_show_total_bytes_pinned(struct kobject *kobj, 3356ab0a202SJeff Mahoney struct kobj_attribute *a, 3366ab0a202SJeff Mahoney char *buf) 3376ab0a202SJeff Mahoney { 3386ab0a202SJeff Mahoney struct btrfs_space_info *sinfo = to_space_info(kobj); 3396ab0a202SJeff Mahoney s64 val = percpu_counter_sum(&sinfo->total_bytes_pinned); 3406ab0a202SJeff Mahoney return snprintf(buf, PAGE_SIZE, "%lld\n", val); 3416ab0a202SJeff Mahoney } 3426ab0a202SJeff Mahoney 3436ab0a202SJeff Mahoney SPACE_INFO_ATTR(flags); 3446ab0a202SJeff Mahoney SPACE_INFO_ATTR(total_bytes); 3456ab0a202SJeff Mahoney SPACE_INFO_ATTR(bytes_used); 3466ab0a202SJeff Mahoney SPACE_INFO_ATTR(bytes_pinned); 3476ab0a202SJeff Mahoney SPACE_INFO_ATTR(bytes_reserved); 3486ab0a202SJeff Mahoney SPACE_INFO_ATTR(bytes_may_use); 349c1fd5c30SWang Xiaoguang SPACE_INFO_ATTR(bytes_readonly); 3506ab0a202SJeff Mahoney SPACE_INFO_ATTR(disk_used); 3516ab0a202SJeff Mahoney SPACE_INFO_ATTR(disk_total); 352a969f4ccSHans van Kranenburg BTRFS_ATTR(space_info, total_bytes_pinned, 353a969f4ccSHans van Kranenburg btrfs_space_info_show_total_bytes_pinned); 3546ab0a202SJeff Mahoney 3556ab0a202SJeff Mahoney static struct attribute *space_info_attrs[] = { 356a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, flags), 357a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, total_bytes), 358a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, bytes_used), 359a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, bytes_pinned), 360a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, bytes_reserved), 361a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, bytes_may_use), 362a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, bytes_readonly), 363a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, disk_used), 364a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, disk_total), 365a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, total_bytes_pinned), 3666ab0a202SJeff Mahoney NULL, 3676ab0a202SJeff Mahoney }; 3687c7e3014SKimberly Brown ATTRIBUTE_GROUPS(space_info); 3696ab0a202SJeff Mahoney 3706ab0a202SJeff Mahoney static void space_info_release(struct kobject *kobj) 3716ab0a202SJeff Mahoney { 3726ab0a202SJeff Mahoney struct btrfs_space_info *sinfo = to_space_info(kobj); 3736ab0a202SJeff Mahoney percpu_counter_destroy(&sinfo->total_bytes_pinned); 3746ab0a202SJeff Mahoney kfree(sinfo); 3756ab0a202SJeff Mahoney } 3766ab0a202SJeff Mahoney 3776ab0a202SJeff Mahoney struct kobj_type space_info_ktype = { 3786ab0a202SJeff Mahoney .sysfs_ops = &kobj_sysfs_ops, 3796ab0a202SJeff Mahoney .release = space_info_release, 3807c7e3014SKimberly Brown .default_groups = space_info_groups, 3816ab0a202SJeff Mahoney }; 3826ab0a202SJeff Mahoney 3836ab0a202SJeff Mahoney static const struct attribute *allocation_attrs[] = { 384a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(allocation, global_rsv_reserved), 385a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(allocation, global_rsv_size), 3866ab0a202SJeff Mahoney NULL, 3876ab0a202SJeff Mahoney }; 3886ab0a202SJeff Mahoney 389f8ba9c11SJeff Mahoney static ssize_t btrfs_label_show(struct kobject *kobj, 390f8ba9c11SJeff Mahoney struct kobj_attribute *a, char *buf) 391f8ba9c11SJeff Mahoney { 392f8ba9c11SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj); 39348fcc3ffSSatoru Takeuchi char *label = fs_info->super_copy->label; 394ee17fc80SDavid Sterba ssize_t ret; 395ee17fc80SDavid Sterba 396ee17fc80SDavid Sterba spin_lock(&fs_info->super_lock); 397ee17fc80SDavid Sterba ret = snprintf(buf, PAGE_SIZE, label[0] ? "%s\n" : "%s", label); 398ee17fc80SDavid Sterba spin_unlock(&fs_info->super_lock); 399ee17fc80SDavid Sterba 400ee17fc80SDavid Sterba return ret; 401f8ba9c11SJeff Mahoney } 402f8ba9c11SJeff Mahoney 403f8ba9c11SJeff Mahoney static ssize_t btrfs_label_store(struct kobject *kobj, 404f8ba9c11SJeff Mahoney struct kobj_attribute *a, 405f8ba9c11SJeff Mahoney const char *buf, size_t len) 406f8ba9c11SJeff Mahoney { 407f8ba9c11SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj); 40848fcc3ffSSatoru Takeuchi size_t p_len; 409f8ba9c11SJeff Mahoney 41066ac9fe7SDavid Sterba if (!fs_info) 41166ac9fe7SDavid Sterba return -EPERM; 41266ac9fe7SDavid Sterba 413bc98a42cSDavid Howells if (sb_rdonly(fs_info->sb)) 41479aec2b8SAnand Jain return -EROFS; 41579aec2b8SAnand Jain 41648fcc3ffSSatoru Takeuchi /* 41748fcc3ffSSatoru Takeuchi * p_len is the len until the first occurrence of either 41848fcc3ffSSatoru Takeuchi * '\n' or '\0' 41948fcc3ffSSatoru Takeuchi */ 42048fcc3ffSSatoru Takeuchi p_len = strcspn(buf, "\n"); 42148fcc3ffSSatoru Takeuchi 42248fcc3ffSSatoru Takeuchi if (p_len >= BTRFS_LABEL_SIZE) 423f8ba9c11SJeff Mahoney return -EINVAL; 424f8ba9c11SJeff Mahoney 425a6f69dc8SDavid Sterba spin_lock(&fs_info->super_lock); 42648fcc3ffSSatoru Takeuchi memset(fs_info->super_copy->label, 0, BTRFS_LABEL_SIZE); 42748fcc3ffSSatoru Takeuchi memcpy(fs_info->super_copy->label, buf, p_len); 428a6f69dc8SDavid Sterba spin_unlock(&fs_info->super_lock); 429f8ba9c11SJeff Mahoney 430a6f69dc8SDavid Sterba /* 431a6f69dc8SDavid Sterba * We don't want to do full transaction commit from inside sysfs 432a6f69dc8SDavid Sterba */ 433a6f69dc8SDavid Sterba btrfs_set_pending(fs_info, COMMIT); 434a6f69dc8SDavid Sterba wake_up_process(fs_info->transaction_kthread); 435a6f69dc8SDavid Sterba 436f8ba9c11SJeff Mahoney return len; 437f8ba9c11SJeff Mahoney } 438a969f4ccSHans van Kranenburg BTRFS_ATTR_RW(, label, btrfs_label_show, btrfs_label_store); 439f8ba9c11SJeff Mahoney 440df93589aSDavid Sterba static ssize_t btrfs_nodesize_show(struct kobject *kobj, 441df93589aSDavid Sterba struct kobj_attribute *a, char *buf) 442df93589aSDavid Sterba { 443df93589aSDavid Sterba struct btrfs_fs_info *fs_info = to_fs_info(kobj); 444df93589aSDavid Sterba 445093e037cSDavid Sterba return snprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->nodesize); 446df93589aSDavid Sterba } 447df93589aSDavid Sterba 448a969f4ccSHans van Kranenburg BTRFS_ATTR(, nodesize, btrfs_nodesize_show); 449df93589aSDavid Sterba 450df93589aSDavid Sterba static ssize_t btrfs_sectorsize_show(struct kobject *kobj, 451df93589aSDavid Sterba struct kobj_attribute *a, char *buf) 452df93589aSDavid Sterba { 453df93589aSDavid Sterba struct btrfs_fs_info *fs_info = to_fs_info(kobj); 454df93589aSDavid Sterba 455093e037cSDavid Sterba return snprintf(buf, PAGE_SIZE, "%u\n", 456093e037cSDavid Sterba fs_info->super_copy->sectorsize); 457df93589aSDavid Sterba } 458df93589aSDavid Sterba 459a969f4ccSHans van Kranenburg BTRFS_ATTR(, sectorsize, btrfs_sectorsize_show); 460df93589aSDavid Sterba 461df93589aSDavid Sterba static ssize_t btrfs_clone_alignment_show(struct kobject *kobj, 462df93589aSDavid Sterba struct kobj_attribute *a, char *buf) 463df93589aSDavid Sterba { 464df93589aSDavid Sterba struct btrfs_fs_info *fs_info = to_fs_info(kobj); 465df93589aSDavid Sterba 466093e037cSDavid Sterba return snprintf(buf, PAGE_SIZE, "%u\n", 467093e037cSDavid Sterba fs_info->super_copy->sectorsize); 468df93589aSDavid Sterba } 469df93589aSDavid Sterba 470a969f4ccSHans van Kranenburg BTRFS_ATTR(, clone_alignment, btrfs_clone_alignment_show); 471df93589aSDavid Sterba 4722723480aSSargun Dhillon static ssize_t quota_override_show(struct kobject *kobj, 4732723480aSSargun Dhillon struct kobj_attribute *a, char *buf) 4742723480aSSargun Dhillon { 4752723480aSSargun Dhillon struct btrfs_fs_info *fs_info = to_fs_info(kobj); 4762723480aSSargun Dhillon int quota_override; 4772723480aSSargun Dhillon 4782723480aSSargun Dhillon quota_override = test_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags); 4792723480aSSargun Dhillon return snprintf(buf, PAGE_SIZE, "%d\n", quota_override); 4802723480aSSargun Dhillon } 4812723480aSSargun Dhillon 4822723480aSSargun Dhillon static ssize_t quota_override_store(struct kobject *kobj, 4832723480aSSargun Dhillon struct kobj_attribute *a, 4842723480aSSargun Dhillon const char *buf, size_t len) 4852723480aSSargun Dhillon { 4862723480aSSargun Dhillon struct btrfs_fs_info *fs_info = to_fs_info(kobj); 4872723480aSSargun Dhillon unsigned long knob; 4882723480aSSargun Dhillon int err; 4892723480aSSargun Dhillon 4902723480aSSargun Dhillon if (!fs_info) 4912723480aSSargun Dhillon return -EPERM; 4922723480aSSargun Dhillon 4932723480aSSargun Dhillon if (!capable(CAP_SYS_RESOURCE)) 4942723480aSSargun Dhillon return -EPERM; 4952723480aSSargun Dhillon 4962723480aSSargun Dhillon err = kstrtoul(buf, 10, &knob); 4972723480aSSargun Dhillon if (err) 4982723480aSSargun Dhillon return err; 4992723480aSSargun Dhillon if (knob > 1) 5002723480aSSargun Dhillon return -EINVAL; 5012723480aSSargun Dhillon 5022723480aSSargun Dhillon if (knob) 5032723480aSSargun Dhillon set_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags); 5042723480aSSargun Dhillon else 5052723480aSSargun Dhillon clear_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags); 5062723480aSSargun Dhillon 5072723480aSSargun Dhillon return len; 5082723480aSSargun Dhillon } 5092723480aSSargun Dhillon 510a969f4ccSHans van Kranenburg BTRFS_ATTR_RW(, quota_override, quota_override_show, quota_override_store); 5112723480aSSargun Dhillon 51256f20f40SNikolay Borisov static ssize_t btrfs_metadata_uuid_show(struct kobject *kobj, 51356f20f40SNikolay Borisov struct kobj_attribute *a, char *buf) 51456f20f40SNikolay Borisov { 51556f20f40SNikolay Borisov struct btrfs_fs_info *fs_info = to_fs_info(kobj); 51656f20f40SNikolay Borisov 51756f20f40SNikolay Borisov return snprintf(buf, PAGE_SIZE, "%pU\n", 51856f20f40SNikolay Borisov fs_info->fs_devices->metadata_uuid); 51956f20f40SNikolay Borisov } 52056f20f40SNikolay Borisov 52156f20f40SNikolay Borisov BTRFS_ATTR(, metadata_uuid, btrfs_metadata_uuid_show); 52256f20f40SNikolay Borisov 5230dd2906fSAnand Jain static const struct attribute *btrfs_attrs[] = { 524a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(, label), 525a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(, nodesize), 526a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(, sectorsize), 527a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(, clone_alignment), 528a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(, quota_override), 52956f20f40SNikolay Borisov BTRFS_ATTR_PTR(, metadata_uuid), 530f8ba9c11SJeff Mahoney NULL, 531f8ba9c11SJeff Mahoney }; 532f8ba9c11SJeff Mahoney 533c1b7e474SAnand Jain static void btrfs_release_fsid_kobj(struct kobject *kobj) 534510d7360SJeff Mahoney { 5352e7910d6SAnand Jain struct btrfs_fs_devices *fs_devs = to_fs_devs(kobj); 536248d200dSAnand Jain 537c1b7e474SAnand Jain memset(&fs_devs->fsid_kobj, 0, sizeof(struct kobject)); 5382e7910d6SAnand Jain complete(&fs_devs->kobj_unregister); 539510d7360SJeff Mahoney } 540510d7360SJeff Mahoney 541510d7360SJeff Mahoney static struct kobj_type btrfs_ktype = { 542510d7360SJeff Mahoney .sysfs_ops = &kobj_sysfs_ops, 543c1b7e474SAnand Jain .release = btrfs_release_fsid_kobj, 544510d7360SJeff Mahoney }; 545510d7360SJeff Mahoney 5462e7910d6SAnand Jain static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj) 5472e7910d6SAnand Jain { 5482e7910d6SAnand Jain if (kobj->ktype != &btrfs_ktype) 5492e7910d6SAnand Jain return NULL; 550c1b7e474SAnand Jain return container_of(kobj, struct btrfs_fs_devices, fsid_kobj); 5512e7910d6SAnand Jain } 5522e7910d6SAnand Jain 553510d7360SJeff Mahoney static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj) 554510d7360SJeff Mahoney { 555510d7360SJeff Mahoney if (kobj->ktype != &btrfs_ktype) 556510d7360SJeff Mahoney return NULL; 5572e7910d6SAnand Jain return to_fs_devs(kobj)->fs_info; 558510d7360SJeff Mahoney } 55958176a96SJosef Bacik 560e453d989SJeff Mahoney #define NUM_FEATURE_BITS 64 5616c52157fSTomohiro Misono #define BTRFS_FEATURE_NAME_MAX 13 5626c52157fSTomohiro Misono static char btrfs_unknown_feature_names[FEAT_MAX][NUM_FEATURE_BITS][BTRFS_FEATURE_NAME_MAX]; 5636c52157fSTomohiro Misono static struct btrfs_feature_attr btrfs_feature_attrs[FEAT_MAX][NUM_FEATURE_BITS]; 564e453d989SJeff Mahoney 5656c52157fSTomohiro Misono static const u64 supported_feature_masks[FEAT_MAX] = { 566e453d989SJeff Mahoney [FEAT_COMPAT] = BTRFS_FEATURE_COMPAT_SUPP, 567e453d989SJeff Mahoney [FEAT_COMPAT_RO] = BTRFS_FEATURE_COMPAT_RO_SUPP, 568e453d989SJeff Mahoney [FEAT_INCOMPAT] = BTRFS_FEATURE_INCOMPAT_SUPP, 569e453d989SJeff Mahoney }; 570e453d989SJeff Mahoney 571e453d989SJeff Mahoney static int addrm_unknown_feature_attrs(struct btrfs_fs_info *fs_info, bool add) 5725ac1d209SJeff Mahoney { 573e453d989SJeff Mahoney int set; 574e453d989SJeff Mahoney 575e453d989SJeff Mahoney for (set = 0; set < FEAT_MAX; set++) { 576e453d989SJeff Mahoney int i; 577e453d989SJeff Mahoney struct attribute *attrs[2]; 578e453d989SJeff Mahoney struct attribute_group agroup = { 579e453d989SJeff Mahoney .name = "features", 580e453d989SJeff Mahoney .attrs = attrs, 581e453d989SJeff Mahoney }; 582e453d989SJeff Mahoney u64 features = get_features(fs_info, set); 583e453d989SJeff Mahoney features &= ~supported_feature_masks[set]; 584e453d989SJeff Mahoney 585e453d989SJeff Mahoney if (!features) 586e453d989SJeff Mahoney continue; 587e453d989SJeff Mahoney 588e453d989SJeff Mahoney attrs[1] = NULL; 589e453d989SJeff Mahoney for (i = 0; i < NUM_FEATURE_BITS; i++) { 590e453d989SJeff Mahoney struct btrfs_feature_attr *fa; 591e453d989SJeff Mahoney 592e453d989SJeff Mahoney if (!(features & (1ULL << i))) 593e453d989SJeff Mahoney continue; 594e453d989SJeff Mahoney 595e453d989SJeff Mahoney fa = &btrfs_feature_attrs[set][i]; 596e453d989SJeff Mahoney attrs[0] = &fa->kobj_attr.attr; 597e453d989SJeff Mahoney if (add) { 598e453d989SJeff Mahoney int ret; 599c1b7e474SAnand Jain ret = sysfs_merge_group(&fs_info->fs_devices->fsid_kobj, 600e453d989SJeff Mahoney &agroup); 601e453d989SJeff Mahoney if (ret) 602e453d989SJeff Mahoney return ret; 603e453d989SJeff Mahoney } else 604c1b7e474SAnand Jain sysfs_unmerge_group(&fs_info->fs_devices->fsid_kobj, 605e453d989SJeff Mahoney &agroup); 606e453d989SJeff Mahoney } 607e453d989SJeff Mahoney 608e453d989SJeff Mahoney } 609e453d989SJeff Mahoney return 0; 610e453d989SJeff Mahoney } 611e453d989SJeff Mahoney 6122e3e1281SAnand Jain static void __btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs) 613e453d989SJeff Mahoney { 6142e7910d6SAnand Jain if (fs_devs->device_dir_kobj) { 6152e7910d6SAnand Jain kobject_del(fs_devs->device_dir_kobj); 6162e7910d6SAnand Jain kobject_put(fs_devs->device_dir_kobj); 6172e7910d6SAnand Jain fs_devs->device_dir_kobj = NULL; 618aaf13305SAnand Jain } 619aaf13305SAnand Jain 620c1b7e474SAnand Jain if (fs_devs->fsid_kobj.state_initialized) { 621c1b7e474SAnand Jain kobject_del(&fs_devs->fsid_kobj); 622c1b7e474SAnand Jain kobject_put(&fs_devs->fsid_kobj); 6232e7910d6SAnand Jain wait_for_completion(&fs_devs->kobj_unregister); 6245ac1d209SJeff Mahoney } 625f90fc547SAnand Jain } 6265ac1d209SJeff Mahoney 6272e3e1281SAnand Jain /* when fs_devs is NULL it will remove all fsid kobject */ 6281d1c1be3SAnand Jain void btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs) 6292e3e1281SAnand Jain { 6302e3e1281SAnand Jain struct list_head *fs_uuids = btrfs_get_fs_uuids(); 6312e3e1281SAnand Jain 6322e3e1281SAnand Jain if (fs_devs) { 6332e3e1281SAnand Jain __btrfs_sysfs_remove_fsid(fs_devs); 6342e3e1281SAnand Jain return; 6352e3e1281SAnand Jain } 6362e3e1281SAnand Jain 637c4babc5eSAnand Jain list_for_each_entry(fs_devs, fs_uuids, fs_list) { 6382e3e1281SAnand Jain __btrfs_sysfs_remove_fsid(fs_devs); 6392e3e1281SAnand Jain } 6402e3e1281SAnand Jain } 6412e3e1281SAnand Jain 6426618a59bSAnand Jain void btrfs_sysfs_remove_mounted(struct btrfs_fs_info *fs_info) 643e453d989SJeff Mahoney { 6445a13f430SAnand Jain btrfs_reset_fs_info_ptr(fs_info); 6455a13f430SAnand Jain 646e453d989SJeff Mahoney if (fs_info->space_info_kobj) { 647e453d989SJeff Mahoney sysfs_remove_files(fs_info->space_info_kobj, allocation_attrs); 648e453d989SJeff Mahoney kobject_del(fs_info->space_info_kobj); 649e453d989SJeff Mahoney kobject_put(fs_info->space_info_kobj); 650e453d989SJeff Mahoney } 651e453d989SJeff Mahoney addrm_unknown_feature_attrs(fs_info, false); 652c1b7e474SAnand Jain sysfs_remove_group(&fs_info->fs_devices->fsid_kobj, &btrfs_feature_attr_group); 653c1b7e474SAnand Jain sysfs_remove_files(&fs_info->fs_devices->fsid_kobj, btrfs_attrs); 65432576040SAnand Jain btrfs_sysfs_rm_device_link(fs_info->fs_devices, NULL); 655e453d989SJeff Mahoney } 656e453d989SJeff Mahoney 6576c52157fSTomohiro Misono const char * const btrfs_feature_set_names[FEAT_MAX] = { 65879da4fa4SJeff Mahoney [FEAT_COMPAT] = "compat", 65979da4fa4SJeff Mahoney [FEAT_COMPAT_RO] = "compat_ro", 66079da4fa4SJeff Mahoney [FEAT_INCOMPAT] = "incompat", 66179da4fa4SJeff Mahoney }; 66279da4fa4SJeff Mahoney 6633b02a68aSJeff Mahoney char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags) 6643b02a68aSJeff Mahoney { 6653b02a68aSJeff Mahoney size_t bufsize = 4096; /* safe max, 64 names * 64 bytes */ 6663b02a68aSJeff Mahoney int len = 0; 6673b02a68aSJeff Mahoney int i; 6683b02a68aSJeff Mahoney char *str; 6693b02a68aSJeff Mahoney 6703b02a68aSJeff Mahoney str = kmalloc(bufsize, GFP_KERNEL); 6713b02a68aSJeff Mahoney if (!str) 6723b02a68aSJeff Mahoney return str; 6733b02a68aSJeff Mahoney 6743b02a68aSJeff Mahoney for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { 6753b02a68aSJeff Mahoney const char *name; 6763b02a68aSJeff Mahoney 6773b02a68aSJeff Mahoney if (!(flags & (1ULL << i))) 6783b02a68aSJeff Mahoney continue; 6793b02a68aSJeff Mahoney 6803b02a68aSJeff Mahoney name = btrfs_feature_attrs[set][i].kobj_attr.attr.name; 6813b02a68aSJeff Mahoney len += snprintf(str + len, bufsize - len, "%s%s", 6823b02a68aSJeff Mahoney len ? "," : "", name); 6833b02a68aSJeff Mahoney } 6843b02a68aSJeff Mahoney 6853b02a68aSJeff Mahoney return str; 6863b02a68aSJeff Mahoney } 6873b02a68aSJeff Mahoney 68879da4fa4SJeff Mahoney static void init_feature_attrs(void) 68979da4fa4SJeff Mahoney { 69079da4fa4SJeff Mahoney struct btrfs_feature_attr *fa; 69179da4fa4SJeff Mahoney int set, i; 69279da4fa4SJeff Mahoney 69379da4fa4SJeff Mahoney BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names) != 69479da4fa4SJeff Mahoney ARRAY_SIZE(btrfs_feature_attrs)); 69579da4fa4SJeff Mahoney BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names[0]) != 69679da4fa4SJeff Mahoney ARRAY_SIZE(btrfs_feature_attrs[0])); 69779da4fa4SJeff Mahoney 6983b02a68aSJeff Mahoney memset(btrfs_feature_attrs, 0, sizeof(btrfs_feature_attrs)); 6993b02a68aSJeff Mahoney memset(btrfs_unknown_feature_names, 0, 7003b02a68aSJeff Mahoney sizeof(btrfs_unknown_feature_names)); 7013b02a68aSJeff Mahoney 70279da4fa4SJeff Mahoney for (i = 0; btrfs_supported_feature_attrs[i]; i++) { 70379da4fa4SJeff Mahoney struct btrfs_feature_attr *sfa; 70479da4fa4SJeff Mahoney struct attribute *a = btrfs_supported_feature_attrs[i]; 7053b02a68aSJeff Mahoney int bit; 70679da4fa4SJeff Mahoney sfa = attr_to_btrfs_feature_attr(a); 7073b02a68aSJeff Mahoney bit = ilog2(sfa->feature_bit); 7083b02a68aSJeff Mahoney fa = &btrfs_feature_attrs[sfa->feature_set][bit]; 70979da4fa4SJeff Mahoney 71079da4fa4SJeff Mahoney fa->kobj_attr.attr.name = sfa->kobj_attr.attr.name; 71179da4fa4SJeff Mahoney } 71279da4fa4SJeff Mahoney 71379da4fa4SJeff Mahoney for (set = 0; set < FEAT_MAX; set++) { 71479da4fa4SJeff Mahoney for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { 71579da4fa4SJeff Mahoney char *name = btrfs_unknown_feature_names[set][i]; 71679da4fa4SJeff Mahoney fa = &btrfs_feature_attrs[set][i]; 71779da4fa4SJeff Mahoney 71879da4fa4SJeff Mahoney if (fa->kobj_attr.attr.name) 71979da4fa4SJeff Mahoney continue; 72079da4fa4SJeff Mahoney 7216c52157fSTomohiro Misono snprintf(name, BTRFS_FEATURE_NAME_MAX, "%s:%u", 72279da4fa4SJeff Mahoney btrfs_feature_set_names[set], i); 72379da4fa4SJeff Mahoney 72479da4fa4SJeff Mahoney fa->kobj_attr.attr.name = name; 72579da4fa4SJeff Mahoney fa->kobj_attr.attr.mode = S_IRUGO; 72679da4fa4SJeff Mahoney fa->feature_set = set; 72779da4fa4SJeff Mahoney fa->feature_bit = 1ULL << i; 72879da4fa4SJeff Mahoney } 72979da4fa4SJeff Mahoney } 73079da4fa4SJeff Mahoney } 73179da4fa4SJeff Mahoney 732e7e1aa9cSAnand Jain /* when one_device is NULL, it removes all device links */ 733e7e1aa9cSAnand Jain 73432576040SAnand Jain int btrfs_sysfs_rm_device_link(struct btrfs_fs_devices *fs_devices, 73599994cdeSAnand Jain struct btrfs_device *one_device) 73699994cdeSAnand Jain { 73799994cdeSAnand Jain struct hd_struct *disk; 73899994cdeSAnand Jain struct kobject *disk_kobj; 73999994cdeSAnand Jain 7406c14a164SAnand Jain if (!fs_devices->device_dir_kobj) 74199994cdeSAnand Jain return -EINVAL; 74299994cdeSAnand Jain 74387fa3bb0SLiu Bo if (one_device && one_device->bdev) { 74499994cdeSAnand Jain disk = one_device->bdev->bd_part; 74599994cdeSAnand Jain disk_kobj = &part_to_dev(disk)->kobj; 74699994cdeSAnand Jain 7476c14a164SAnand Jain sysfs_remove_link(fs_devices->device_dir_kobj, 74899994cdeSAnand Jain disk_kobj->name); 74999994cdeSAnand Jain } 75099994cdeSAnand Jain 751e7e1aa9cSAnand Jain if (one_device) 752e7e1aa9cSAnand Jain return 0; 753e7e1aa9cSAnand Jain 754e7e1aa9cSAnand Jain list_for_each_entry(one_device, 7556c14a164SAnand Jain &fs_devices->devices, dev_list) { 756e7e1aa9cSAnand Jain if (!one_device->bdev) 757e7e1aa9cSAnand Jain continue; 758e7e1aa9cSAnand Jain disk = one_device->bdev->bd_part; 759e7e1aa9cSAnand Jain disk_kobj = &part_to_dev(disk)->kobj; 760e7e1aa9cSAnand Jain 7616c14a164SAnand Jain sysfs_remove_link(fs_devices->device_dir_kobj, 762e7e1aa9cSAnand Jain disk_kobj->name); 763e7e1aa9cSAnand Jain } 764e7e1aa9cSAnand Jain 76599994cdeSAnand Jain return 0; 76699994cdeSAnand Jain } 76799994cdeSAnand Jain 7682e7910d6SAnand Jain int btrfs_sysfs_add_device(struct btrfs_fs_devices *fs_devs) 76900c921c2SAnand Jain { 7702e7910d6SAnand Jain if (!fs_devs->device_dir_kobj) 7712e7910d6SAnand Jain fs_devs->device_dir_kobj = kobject_create_and_add("devices", 772c1b7e474SAnand Jain &fs_devs->fsid_kobj); 77300c921c2SAnand Jain 7742e7910d6SAnand Jain if (!fs_devs->device_dir_kobj) 77500c921c2SAnand Jain return -ENOMEM; 77600c921c2SAnand Jain 77700c921c2SAnand Jain return 0; 77800c921c2SAnand Jain } 77900c921c2SAnand Jain 780e3bd6973SAnand Jain int btrfs_sysfs_add_device_link(struct btrfs_fs_devices *fs_devices, 7810d39376aSAnand Jain struct btrfs_device *one_device) 78229e5be24SJeff Mahoney { 78329e5be24SJeff Mahoney int error = 0; 78429e5be24SJeff Mahoney struct btrfs_device *dev; 78529e5be24SJeff Mahoney 78629e5be24SJeff Mahoney list_for_each_entry(dev, &fs_devices->devices, dev_list) { 787f085381eSAnand Jain struct hd_struct *disk; 788f085381eSAnand Jain struct kobject *disk_kobj; 789f085381eSAnand Jain 790f085381eSAnand Jain if (!dev->bdev) 791f085381eSAnand Jain continue; 792f085381eSAnand Jain 7930d39376aSAnand Jain if (one_device && one_device != dev) 7940d39376aSAnand Jain continue; 7950d39376aSAnand Jain 796f085381eSAnand Jain disk = dev->bdev->bd_part; 797f085381eSAnand Jain disk_kobj = &part_to_dev(disk)->kobj; 79829e5be24SJeff Mahoney 7992e7910d6SAnand Jain error = sysfs_create_link(fs_devices->device_dir_kobj, 80029e5be24SJeff Mahoney disk_kobj, disk_kobj->name); 80129e5be24SJeff Mahoney if (error) 80229e5be24SJeff Mahoney break; 80329e5be24SJeff Mahoney } 80429e5be24SJeff Mahoney 80529e5be24SJeff Mahoney return error; 80629e5be24SJeff Mahoney } 80729e5be24SJeff Mahoney 808510d7360SJeff Mahoney /* /sys/fs/btrfs/ entry */ 809510d7360SJeff Mahoney static struct kset *btrfs_kset; 810510d7360SJeff Mahoney 8111bae3098SDavid Sterba /* /sys/kernel/debug/btrfs */ 8121bae3098SDavid Sterba static struct dentry *btrfs_debugfs_root_dentry; 8131bae3098SDavid Sterba 8141bae3098SDavid Sterba /* Debugging tunables and exported data */ 8151bae3098SDavid Sterba u64 btrfs_debugfs_test; 8161bae3098SDavid Sterba 81772059215SAnand Jain /* 81872059215SAnand Jain * Can be called by the device discovery thread. 81972059215SAnand Jain * And parent can be specified for seed device 82072059215SAnand Jain */ 8210c10e2d4SAnand Jain int btrfs_sysfs_add_fsid(struct btrfs_fs_devices *fs_devs, 82272059215SAnand Jain struct kobject *parent) 8235ac1d209SJeff Mahoney { 8245ac1d209SJeff Mahoney int error; 8255ac1d209SJeff Mahoney 8262e7910d6SAnand Jain init_completion(&fs_devs->kobj_unregister); 827c1b7e474SAnand Jain fs_devs->fsid_kobj.kset = btrfs_kset; 828c1b7e474SAnand Jain error = kobject_init_and_add(&fs_devs->fsid_kobj, 82924bd69cbSAnand Jain &btrfs_ktype, parent, "%pU", fs_devs->fsid); 830e3277335STobin C. Harding if (error) { 831e3277335STobin C. Harding kobject_put(&fs_devs->fsid_kobj); 83272059215SAnand Jain return error; 83372059215SAnand Jain } 83472059215SAnand Jain 835e3277335STobin C. Harding return 0; 836e3277335STobin C. Harding } 837e3277335STobin C. Harding 83896f3136eSAnand Jain int btrfs_sysfs_add_mounted(struct btrfs_fs_info *fs_info) 83972059215SAnand Jain { 84072059215SAnand Jain int error; 8412e7910d6SAnand Jain struct btrfs_fs_devices *fs_devs = fs_info->fs_devices; 842c1b7e474SAnand Jain struct kobject *fsid_kobj = &fs_devs->fsid_kobj; 84372059215SAnand Jain 8445a13f430SAnand Jain btrfs_set_fs_info_ptr(fs_info); 8455a13f430SAnand Jain 846e3bd6973SAnand Jain error = btrfs_sysfs_add_device_link(fs_devs, NULL); 847e453d989SJeff Mahoney if (error) 848e453d989SJeff Mahoney return error; 849510d7360SJeff Mahoney 850c1b7e474SAnand Jain error = sysfs_create_files(fsid_kobj, btrfs_attrs); 851e453d989SJeff Mahoney if (error) { 85232576040SAnand Jain btrfs_sysfs_rm_device_link(fs_devs, NULL); 853e453d989SJeff Mahoney return error; 854e453d989SJeff Mahoney } 85579da4fa4SJeff Mahoney 856c1b7e474SAnand Jain error = sysfs_create_group(fsid_kobj, 8570dd2906fSAnand Jain &btrfs_feature_attr_group); 8580dd2906fSAnand Jain if (error) 8590dd2906fSAnand Jain goto failure; 8600dd2906fSAnand Jain 861e453d989SJeff Mahoney error = addrm_unknown_feature_attrs(fs_info, true); 86279da4fa4SJeff Mahoney if (error) 86379da4fa4SJeff Mahoney goto failure; 86479da4fa4SJeff Mahoney 8656ab0a202SJeff Mahoney fs_info->space_info_kobj = kobject_create_and_add("allocation", 866c1b7e474SAnand Jain fsid_kobj); 8676ab0a202SJeff Mahoney if (!fs_info->space_info_kobj) { 8686ab0a202SJeff Mahoney error = -ENOMEM; 8696ab0a202SJeff Mahoney goto failure; 8706ab0a202SJeff Mahoney } 8716ab0a202SJeff Mahoney 8726ab0a202SJeff Mahoney error = sysfs_create_files(fs_info->space_info_kobj, allocation_attrs); 8736ab0a202SJeff Mahoney if (error) 8746ab0a202SJeff Mahoney goto failure; 8756ab0a202SJeff Mahoney 87679da4fa4SJeff Mahoney return 0; 87779da4fa4SJeff Mahoney failure: 8786618a59bSAnand Jain btrfs_sysfs_remove_mounted(fs_info); 8795ac1d209SJeff Mahoney return error; 8805ac1d209SJeff Mahoney } 8815ac1d209SJeff Mahoney 882444e7516SDavid Sterba 883444e7516SDavid Sterba /* 884444e7516SDavid Sterba * Change per-fs features in /sys/fs/btrfs/UUID/features to match current 885444e7516SDavid Sterba * values in superblock. Call after any changes to incompat/compat_ro flags 886444e7516SDavid Sterba */ 887444e7516SDavid Sterba void btrfs_sysfs_feature_update(struct btrfs_fs_info *fs_info, 888444e7516SDavid Sterba u64 bit, enum btrfs_feature_set set) 889444e7516SDavid Sterba { 890444e7516SDavid Sterba struct btrfs_fs_devices *fs_devs; 891444e7516SDavid Sterba struct kobject *fsid_kobj; 892444e7516SDavid Sterba u64 features; 893444e7516SDavid Sterba int ret; 894444e7516SDavid Sterba 895444e7516SDavid Sterba if (!fs_info) 896444e7516SDavid Sterba return; 897444e7516SDavid Sterba 898444e7516SDavid Sterba features = get_features(fs_info, set); 899444e7516SDavid Sterba ASSERT(bit & supported_feature_masks[set]); 900444e7516SDavid Sterba 901444e7516SDavid Sterba fs_devs = fs_info->fs_devices; 902444e7516SDavid Sterba fsid_kobj = &fs_devs->fsid_kobj; 903444e7516SDavid Sterba 904bf609206SDavid Sterba if (!fsid_kobj->state_initialized) 905bf609206SDavid Sterba return; 906bf609206SDavid Sterba 907444e7516SDavid Sterba /* 908444e7516SDavid Sterba * FIXME: this is too heavy to update just one value, ideally we'd like 909444e7516SDavid Sterba * to use sysfs_update_group but some refactoring is needed first. 910444e7516SDavid Sterba */ 911444e7516SDavid Sterba sysfs_remove_group(fsid_kobj, &btrfs_feature_attr_group); 912444e7516SDavid Sterba ret = sysfs_create_group(fsid_kobj, &btrfs_feature_attr_group); 913444e7516SDavid Sterba } 914444e7516SDavid Sterba 91536b7ee4dSGreg Kroah-Hartman static void btrfs_init_debugfs(void) 9161bae3098SDavid Sterba { 9171bae3098SDavid Sterba #ifdef CONFIG_DEBUG_FS 9181bae3098SDavid Sterba btrfs_debugfs_root_dentry = debugfs_create_dir("btrfs", NULL); 9191bae3098SDavid Sterba 920b0de6c4cSDavid Sterba /* 921b0de6c4cSDavid Sterba * Example code, how to export data through debugfs. 922b0de6c4cSDavid Sterba * 923b0de6c4cSDavid Sterba * file: /sys/kernel/debug/btrfs/test 924b0de6c4cSDavid Sterba * contents of: btrfs_debugfs_test 925b0de6c4cSDavid Sterba */ 926b0de6c4cSDavid Sterba #ifdef CONFIG_BTRFS_DEBUG 92707f6a480SEric Sandeen debugfs_create_u64("test", S_IRUGO | S_IWUSR, btrfs_debugfs_root_dentry, 9281bae3098SDavid Sterba &btrfs_debugfs_test); 9291bae3098SDavid Sterba #endif 930b0de6c4cSDavid Sterba 931b0de6c4cSDavid Sterba #endif 9321bae3098SDavid Sterba } 9331bae3098SDavid Sterba 934f5c29bd9SLiu Bo int __init btrfs_init_sysfs(void) 93558176a96SJosef Bacik { 936079b72bcSJeff Mahoney int ret; 9371bae3098SDavid Sterba 938e3fe4e71SGreg KH btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj); 939e3fe4e71SGreg KH if (!btrfs_kset) 940e3fe4e71SGreg KH return -ENOMEM; 941079b72bcSJeff Mahoney 94236b7ee4dSGreg Kroah-Hartman btrfs_init_debugfs(); 943079b72bcSJeff Mahoney 9441bae3098SDavid Sterba init_feature_attrs(); 9451bae3098SDavid Sterba ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); 946001a648dSFilipe Manana if (ret) 947001a648dSFilipe Manana goto out2; 948f902bd3aSMisono Tomohiro ret = sysfs_merge_group(&btrfs_kset->kobj, 949f902bd3aSMisono Tomohiro &btrfs_static_feature_attr_group); 950f902bd3aSMisono Tomohiro if (ret) 951f902bd3aSMisono Tomohiro goto out_remove_group; 952001a648dSFilipe Manana 953001a648dSFilipe Manana return 0; 954f902bd3aSMisono Tomohiro 955f902bd3aSMisono Tomohiro out_remove_group: 956f902bd3aSMisono Tomohiro sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); 957001a648dSFilipe Manana out2: 958001a648dSFilipe Manana debugfs_remove_recursive(btrfs_debugfs_root_dentry); 959001a648dSFilipe Manana kset_unregister(btrfs_kset); 9601bae3098SDavid Sterba 9611bae3098SDavid Sterba return ret; 96258176a96SJosef Bacik } 96358176a96SJosef Bacik 964e67c718bSDavid Sterba void __cold btrfs_exit_sysfs(void) 96558176a96SJosef Bacik { 966f902bd3aSMisono Tomohiro sysfs_unmerge_group(&btrfs_kset->kobj, 967f902bd3aSMisono Tomohiro &btrfs_static_feature_attr_group); 968079b72bcSJeff Mahoney sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); 969e3fe4e71SGreg KH kset_unregister(btrfs_kset); 9701bae3098SDavid Sterba debugfs_remove_recursive(btrfs_debugfs_root_dentry); 97158176a96SJosef Bacik } 97255d47414SChris Mason 973