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 2516e369febSDavid Sterba #ifdef CONFIG_BTRFS_DEBUG 2526e369febSDavid Sterba 2536e369febSDavid Sterba /* 2546e369febSDavid Sterba * Runtime debugging exported via sysfs 2556e369febSDavid Sterba * 2566e369febSDavid Sterba * /sys/fs/btrfs/debug - applies to module or all filesystems 2576e369febSDavid Sterba * /sys/fs/btrfs/UUID - applies only to the given filesystem 2586e369febSDavid Sterba */ 2596e369febSDavid Sterba static struct attribute *btrfs_debug_feature_attrs[] = { 2606e369febSDavid Sterba NULL 2616e369febSDavid Sterba }; 2626e369febSDavid Sterba 2636e369febSDavid Sterba static const struct attribute_group btrfs_debug_feature_attr_group = { 2646e369febSDavid Sterba .name = "debug", 2656e369febSDavid Sterba .attrs = btrfs_debug_feature_attrs, 2666e369febSDavid Sterba }; 2676e369febSDavid Sterba 2686e369febSDavid Sterba #endif 2696e369febSDavid Sterba 2706ab0a202SJeff Mahoney static ssize_t btrfs_show_u64(u64 *value_ptr, spinlock_t *lock, char *buf) 2716ab0a202SJeff Mahoney { 2726ab0a202SJeff Mahoney u64 val; 2736ab0a202SJeff Mahoney if (lock) 2746ab0a202SJeff Mahoney spin_lock(lock); 2756ab0a202SJeff Mahoney val = *value_ptr; 2766ab0a202SJeff Mahoney if (lock) 2776ab0a202SJeff Mahoney spin_unlock(lock); 2786ab0a202SJeff Mahoney return snprintf(buf, PAGE_SIZE, "%llu\n", val); 2796ab0a202SJeff Mahoney } 2806ab0a202SJeff Mahoney 2816ab0a202SJeff Mahoney static ssize_t global_rsv_size_show(struct kobject *kobj, 2826ab0a202SJeff Mahoney struct kobj_attribute *ka, char *buf) 2836ab0a202SJeff Mahoney { 2846ab0a202SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); 2856ab0a202SJeff Mahoney struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 2866ab0a202SJeff Mahoney return btrfs_show_u64(&block_rsv->size, &block_rsv->lock, buf); 2876ab0a202SJeff Mahoney } 288a969f4ccSHans van Kranenburg BTRFS_ATTR(allocation, global_rsv_size, global_rsv_size_show); 2896ab0a202SJeff Mahoney 2906ab0a202SJeff Mahoney static ssize_t global_rsv_reserved_show(struct kobject *kobj, 2916ab0a202SJeff Mahoney struct kobj_attribute *a, char *buf) 2926ab0a202SJeff Mahoney { 2936ab0a202SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); 2946ab0a202SJeff Mahoney struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 2956ab0a202SJeff Mahoney return btrfs_show_u64(&block_rsv->reserved, &block_rsv->lock, buf); 2966ab0a202SJeff Mahoney } 297a969f4ccSHans van Kranenburg BTRFS_ATTR(allocation, global_rsv_reserved, global_rsv_reserved_show); 2986ab0a202SJeff Mahoney 2996ab0a202SJeff Mahoney #define to_space_info(_kobj) container_of(_kobj, struct btrfs_space_info, kobj) 300c1895442SJeff Mahoney #define to_raid_kobj(_kobj) container_of(_kobj, struct raid_kobject, kobj) 3016ab0a202SJeff Mahoney 3026ab0a202SJeff Mahoney static ssize_t raid_bytes_show(struct kobject *kobj, 3036ab0a202SJeff Mahoney struct kobj_attribute *attr, char *buf); 304a969f4ccSHans van Kranenburg BTRFS_ATTR(raid, total_bytes, raid_bytes_show); 305a969f4ccSHans van Kranenburg BTRFS_ATTR(raid, used_bytes, raid_bytes_show); 3066ab0a202SJeff Mahoney 3076ab0a202SJeff Mahoney static ssize_t raid_bytes_show(struct kobject *kobj, 3086ab0a202SJeff Mahoney struct kobj_attribute *attr, char *buf) 3096ab0a202SJeff Mahoney 3106ab0a202SJeff Mahoney { 3116ab0a202SJeff Mahoney struct btrfs_space_info *sinfo = to_space_info(kobj->parent); 3126ab0a202SJeff Mahoney struct btrfs_block_group_cache *block_group; 31375cb379dSJeff Mahoney int index = btrfs_bg_flags_to_raid_index(to_raid_kobj(kobj)->flags); 3146ab0a202SJeff Mahoney u64 val = 0; 3156ab0a202SJeff Mahoney 3166ab0a202SJeff Mahoney down_read(&sinfo->groups_sem); 3176ab0a202SJeff Mahoney list_for_each_entry(block_group, &sinfo->block_groups[index], list) { 318a969f4ccSHans van Kranenburg if (&attr->attr == BTRFS_ATTR_PTR(raid, total_bytes)) 3196ab0a202SJeff Mahoney val += block_group->key.offset; 3206ab0a202SJeff Mahoney else 3216ab0a202SJeff Mahoney val += btrfs_block_group_used(&block_group->item); 3226ab0a202SJeff Mahoney } 3236ab0a202SJeff Mahoney up_read(&sinfo->groups_sem); 3246ab0a202SJeff Mahoney return snprintf(buf, PAGE_SIZE, "%llu\n", val); 3256ab0a202SJeff Mahoney } 3266ab0a202SJeff Mahoney 3277c7e3014SKimberly Brown static struct attribute *raid_attrs[] = { 328a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(raid, total_bytes), 329a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(raid, used_bytes), 3306ab0a202SJeff Mahoney NULL 3316ab0a202SJeff Mahoney }; 3327c7e3014SKimberly Brown ATTRIBUTE_GROUPS(raid); 3336ab0a202SJeff Mahoney 3346ab0a202SJeff Mahoney static void release_raid_kobj(struct kobject *kobj) 3356ab0a202SJeff Mahoney { 336c1895442SJeff Mahoney kfree(to_raid_kobj(kobj)); 3376ab0a202SJeff Mahoney } 3386ab0a202SJeff Mahoney 3396ab0a202SJeff Mahoney struct kobj_type btrfs_raid_ktype = { 3406ab0a202SJeff Mahoney .sysfs_ops = &kobj_sysfs_ops, 3416ab0a202SJeff Mahoney .release = release_raid_kobj, 3427c7e3014SKimberly Brown .default_groups = raid_groups, 3436ab0a202SJeff Mahoney }; 3446ab0a202SJeff Mahoney 3456ab0a202SJeff Mahoney #define SPACE_INFO_ATTR(field) \ 3466ab0a202SJeff Mahoney static ssize_t btrfs_space_info_show_##field(struct kobject *kobj, \ 3476ab0a202SJeff Mahoney struct kobj_attribute *a, \ 3486ab0a202SJeff Mahoney char *buf) \ 3496ab0a202SJeff Mahoney { \ 3506ab0a202SJeff Mahoney struct btrfs_space_info *sinfo = to_space_info(kobj); \ 3516ab0a202SJeff Mahoney return btrfs_show_u64(&sinfo->field, &sinfo->lock, buf); \ 3526ab0a202SJeff Mahoney } \ 353a969f4ccSHans van Kranenburg BTRFS_ATTR(space_info, field, btrfs_space_info_show_##field) 3546ab0a202SJeff Mahoney 3556ab0a202SJeff Mahoney static ssize_t btrfs_space_info_show_total_bytes_pinned(struct kobject *kobj, 3566ab0a202SJeff Mahoney struct kobj_attribute *a, 3576ab0a202SJeff Mahoney char *buf) 3586ab0a202SJeff Mahoney { 3596ab0a202SJeff Mahoney struct btrfs_space_info *sinfo = to_space_info(kobj); 3606ab0a202SJeff Mahoney s64 val = percpu_counter_sum(&sinfo->total_bytes_pinned); 3616ab0a202SJeff Mahoney return snprintf(buf, PAGE_SIZE, "%lld\n", val); 3626ab0a202SJeff Mahoney } 3636ab0a202SJeff Mahoney 3646ab0a202SJeff Mahoney SPACE_INFO_ATTR(flags); 3656ab0a202SJeff Mahoney SPACE_INFO_ATTR(total_bytes); 3666ab0a202SJeff Mahoney SPACE_INFO_ATTR(bytes_used); 3676ab0a202SJeff Mahoney SPACE_INFO_ATTR(bytes_pinned); 3686ab0a202SJeff Mahoney SPACE_INFO_ATTR(bytes_reserved); 3696ab0a202SJeff Mahoney SPACE_INFO_ATTR(bytes_may_use); 370c1fd5c30SWang Xiaoguang SPACE_INFO_ATTR(bytes_readonly); 3716ab0a202SJeff Mahoney SPACE_INFO_ATTR(disk_used); 3726ab0a202SJeff Mahoney SPACE_INFO_ATTR(disk_total); 373a969f4ccSHans van Kranenburg BTRFS_ATTR(space_info, total_bytes_pinned, 374a969f4ccSHans van Kranenburg btrfs_space_info_show_total_bytes_pinned); 3756ab0a202SJeff Mahoney 3766ab0a202SJeff Mahoney static struct attribute *space_info_attrs[] = { 377a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, flags), 378a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, total_bytes), 379a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, bytes_used), 380a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, bytes_pinned), 381a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, bytes_reserved), 382a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, bytes_may_use), 383a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, bytes_readonly), 384a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, disk_used), 385a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, disk_total), 386a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, total_bytes_pinned), 3876ab0a202SJeff Mahoney NULL, 3886ab0a202SJeff Mahoney }; 3897c7e3014SKimberly Brown ATTRIBUTE_GROUPS(space_info); 3906ab0a202SJeff Mahoney 3916ab0a202SJeff Mahoney static void space_info_release(struct kobject *kobj) 3926ab0a202SJeff Mahoney { 3936ab0a202SJeff Mahoney struct btrfs_space_info *sinfo = to_space_info(kobj); 3946ab0a202SJeff Mahoney percpu_counter_destroy(&sinfo->total_bytes_pinned); 3956ab0a202SJeff Mahoney kfree(sinfo); 3966ab0a202SJeff Mahoney } 3976ab0a202SJeff Mahoney 3986ab0a202SJeff Mahoney struct kobj_type space_info_ktype = { 3996ab0a202SJeff Mahoney .sysfs_ops = &kobj_sysfs_ops, 4006ab0a202SJeff Mahoney .release = space_info_release, 4017c7e3014SKimberly Brown .default_groups = space_info_groups, 4026ab0a202SJeff Mahoney }; 4036ab0a202SJeff Mahoney 4046ab0a202SJeff Mahoney static const struct attribute *allocation_attrs[] = { 405a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(allocation, global_rsv_reserved), 406a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(allocation, global_rsv_size), 4076ab0a202SJeff Mahoney NULL, 4086ab0a202SJeff Mahoney }; 4096ab0a202SJeff Mahoney 410f8ba9c11SJeff Mahoney static ssize_t btrfs_label_show(struct kobject *kobj, 411f8ba9c11SJeff Mahoney struct kobj_attribute *a, char *buf) 412f8ba9c11SJeff Mahoney { 413f8ba9c11SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj); 41448fcc3ffSSatoru Takeuchi char *label = fs_info->super_copy->label; 415ee17fc80SDavid Sterba ssize_t ret; 416ee17fc80SDavid Sterba 417ee17fc80SDavid Sterba spin_lock(&fs_info->super_lock); 418ee17fc80SDavid Sterba ret = snprintf(buf, PAGE_SIZE, label[0] ? "%s\n" : "%s", label); 419ee17fc80SDavid Sterba spin_unlock(&fs_info->super_lock); 420ee17fc80SDavid Sterba 421ee17fc80SDavid Sterba return ret; 422f8ba9c11SJeff Mahoney } 423f8ba9c11SJeff Mahoney 424f8ba9c11SJeff Mahoney static ssize_t btrfs_label_store(struct kobject *kobj, 425f8ba9c11SJeff Mahoney struct kobj_attribute *a, 426f8ba9c11SJeff Mahoney const char *buf, size_t len) 427f8ba9c11SJeff Mahoney { 428f8ba9c11SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj); 42948fcc3ffSSatoru Takeuchi size_t p_len; 430f8ba9c11SJeff Mahoney 43166ac9fe7SDavid Sterba if (!fs_info) 43266ac9fe7SDavid Sterba return -EPERM; 43366ac9fe7SDavid Sterba 434bc98a42cSDavid Howells if (sb_rdonly(fs_info->sb)) 43579aec2b8SAnand Jain return -EROFS; 43679aec2b8SAnand Jain 43748fcc3ffSSatoru Takeuchi /* 43848fcc3ffSSatoru Takeuchi * p_len is the len until the first occurrence of either 43948fcc3ffSSatoru Takeuchi * '\n' or '\0' 44048fcc3ffSSatoru Takeuchi */ 44148fcc3ffSSatoru Takeuchi p_len = strcspn(buf, "\n"); 44248fcc3ffSSatoru Takeuchi 44348fcc3ffSSatoru Takeuchi if (p_len >= BTRFS_LABEL_SIZE) 444f8ba9c11SJeff Mahoney return -EINVAL; 445f8ba9c11SJeff Mahoney 446a6f69dc8SDavid Sterba spin_lock(&fs_info->super_lock); 44748fcc3ffSSatoru Takeuchi memset(fs_info->super_copy->label, 0, BTRFS_LABEL_SIZE); 44848fcc3ffSSatoru Takeuchi memcpy(fs_info->super_copy->label, buf, p_len); 449a6f69dc8SDavid Sterba spin_unlock(&fs_info->super_lock); 450f8ba9c11SJeff Mahoney 451a6f69dc8SDavid Sterba /* 452a6f69dc8SDavid Sterba * We don't want to do full transaction commit from inside sysfs 453a6f69dc8SDavid Sterba */ 454a6f69dc8SDavid Sterba btrfs_set_pending(fs_info, COMMIT); 455a6f69dc8SDavid Sterba wake_up_process(fs_info->transaction_kthread); 456a6f69dc8SDavid Sterba 457f8ba9c11SJeff Mahoney return len; 458f8ba9c11SJeff Mahoney } 459a969f4ccSHans van Kranenburg BTRFS_ATTR_RW(, label, btrfs_label_show, btrfs_label_store); 460f8ba9c11SJeff Mahoney 461df93589aSDavid Sterba static ssize_t btrfs_nodesize_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", fs_info->super_copy->nodesize); 467df93589aSDavid Sterba } 468df93589aSDavid Sterba 469a969f4ccSHans van Kranenburg BTRFS_ATTR(, nodesize, btrfs_nodesize_show); 470df93589aSDavid Sterba 471df93589aSDavid Sterba static ssize_t btrfs_sectorsize_show(struct kobject *kobj, 472df93589aSDavid Sterba struct kobj_attribute *a, char *buf) 473df93589aSDavid Sterba { 474df93589aSDavid Sterba struct btrfs_fs_info *fs_info = to_fs_info(kobj); 475df93589aSDavid Sterba 476093e037cSDavid Sterba return snprintf(buf, PAGE_SIZE, "%u\n", 477093e037cSDavid Sterba fs_info->super_copy->sectorsize); 478df93589aSDavid Sterba } 479df93589aSDavid Sterba 480a969f4ccSHans van Kranenburg BTRFS_ATTR(, sectorsize, btrfs_sectorsize_show); 481df93589aSDavid Sterba 482df93589aSDavid Sterba static ssize_t btrfs_clone_alignment_show(struct kobject *kobj, 483df93589aSDavid Sterba struct kobj_attribute *a, char *buf) 484df93589aSDavid Sterba { 485df93589aSDavid Sterba struct btrfs_fs_info *fs_info = to_fs_info(kobj); 486df93589aSDavid Sterba 487093e037cSDavid Sterba return snprintf(buf, PAGE_SIZE, "%u\n", 488093e037cSDavid Sterba fs_info->super_copy->sectorsize); 489df93589aSDavid Sterba } 490df93589aSDavid Sterba 491a969f4ccSHans van Kranenburg BTRFS_ATTR(, clone_alignment, btrfs_clone_alignment_show); 492df93589aSDavid Sterba 4932723480aSSargun Dhillon static ssize_t quota_override_show(struct kobject *kobj, 4942723480aSSargun Dhillon struct kobj_attribute *a, char *buf) 4952723480aSSargun Dhillon { 4962723480aSSargun Dhillon struct btrfs_fs_info *fs_info = to_fs_info(kobj); 4972723480aSSargun Dhillon int quota_override; 4982723480aSSargun Dhillon 4992723480aSSargun Dhillon quota_override = test_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags); 5002723480aSSargun Dhillon return snprintf(buf, PAGE_SIZE, "%d\n", quota_override); 5012723480aSSargun Dhillon } 5022723480aSSargun Dhillon 5032723480aSSargun Dhillon static ssize_t quota_override_store(struct kobject *kobj, 5042723480aSSargun Dhillon struct kobj_attribute *a, 5052723480aSSargun Dhillon const char *buf, size_t len) 5062723480aSSargun Dhillon { 5072723480aSSargun Dhillon struct btrfs_fs_info *fs_info = to_fs_info(kobj); 5082723480aSSargun Dhillon unsigned long knob; 5092723480aSSargun Dhillon int err; 5102723480aSSargun Dhillon 5112723480aSSargun Dhillon if (!fs_info) 5122723480aSSargun Dhillon return -EPERM; 5132723480aSSargun Dhillon 5142723480aSSargun Dhillon if (!capable(CAP_SYS_RESOURCE)) 5152723480aSSargun Dhillon return -EPERM; 5162723480aSSargun Dhillon 5172723480aSSargun Dhillon err = kstrtoul(buf, 10, &knob); 5182723480aSSargun Dhillon if (err) 5192723480aSSargun Dhillon return err; 5202723480aSSargun Dhillon if (knob > 1) 5212723480aSSargun Dhillon return -EINVAL; 5222723480aSSargun Dhillon 5232723480aSSargun Dhillon if (knob) 5242723480aSSargun Dhillon set_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags); 5252723480aSSargun Dhillon else 5262723480aSSargun Dhillon clear_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags); 5272723480aSSargun Dhillon 5282723480aSSargun Dhillon return len; 5292723480aSSargun Dhillon } 5302723480aSSargun Dhillon 531a969f4ccSHans van Kranenburg BTRFS_ATTR_RW(, quota_override, quota_override_show, quota_override_store); 5322723480aSSargun Dhillon 53356f20f40SNikolay Borisov static ssize_t btrfs_metadata_uuid_show(struct kobject *kobj, 53456f20f40SNikolay Borisov struct kobj_attribute *a, char *buf) 53556f20f40SNikolay Borisov { 53656f20f40SNikolay Borisov struct btrfs_fs_info *fs_info = to_fs_info(kobj); 53756f20f40SNikolay Borisov 53856f20f40SNikolay Borisov return snprintf(buf, PAGE_SIZE, "%pU\n", 53956f20f40SNikolay Borisov fs_info->fs_devices->metadata_uuid); 54056f20f40SNikolay Borisov } 54156f20f40SNikolay Borisov 54256f20f40SNikolay Borisov BTRFS_ATTR(, metadata_uuid, btrfs_metadata_uuid_show); 54356f20f40SNikolay Borisov 5440dd2906fSAnand Jain static const struct attribute *btrfs_attrs[] = { 545a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(, label), 546a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(, nodesize), 547a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(, sectorsize), 548a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(, clone_alignment), 549a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(, quota_override), 55056f20f40SNikolay Borisov BTRFS_ATTR_PTR(, metadata_uuid), 551f8ba9c11SJeff Mahoney NULL, 552f8ba9c11SJeff Mahoney }; 553f8ba9c11SJeff Mahoney 554c1b7e474SAnand Jain static void btrfs_release_fsid_kobj(struct kobject *kobj) 555510d7360SJeff Mahoney { 5562e7910d6SAnand Jain struct btrfs_fs_devices *fs_devs = to_fs_devs(kobj); 557248d200dSAnand Jain 558c1b7e474SAnand Jain memset(&fs_devs->fsid_kobj, 0, sizeof(struct kobject)); 5592e7910d6SAnand Jain complete(&fs_devs->kobj_unregister); 560510d7360SJeff Mahoney } 561510d7360SJeff Mahoney 562510d7360SJeff Mahoney static struct kobj_type btrfs_ktype = { 563510d7360SJeff Mahoney .sysfs_ops = &kobj_sysfs_ops, 564c1b7e474SAnand Jain .release = btrfs_release_fsid_kobj, 565510d7360SJeff Mahoney }; 566510d7360SJeff Mahoney 5672e7910d6SAnand Jain static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj) 5682e7910d6SAnand Jain { 5692e7910d6SAnand Jain if (kobj->ktype != &btrfs_ktype) 5702e7910d6SAnand Jain return NULL; 571c1b7e474SAnand Jain return container_of(kobj, struct btrfs_fs_devices, fsid_kobj); 5722e7910d6SAnand Jain } 5732e7910d6SAnand Jain 574510d7360SJeff Mahoney static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj) 575510d7360SJeff Mahoney { 576510d7360SJeff Mahoney if (kobj->ktype != &btrfs_ktype) 577510d7360SJeff Mahoney return NULL; 5782e7910d6SAnand Jain return to_fs_devs(kobj)->fs_info; 579510d7360SJeff Mahoney } 58058176a96SJosef Bacik 581e453d989SJeff Mahoney #define NUM_FEATURE_BITS 64 5826c52157fSTomohiro Misono #define BTRFS_FEATURE_NAME_MAX 13 5836c52157fSTomohiro Misono static char btrfs_unknown_feature_names[FEAT_MAX][NUM_FEATURE_BITS][BTRFS_FEATURE_NAME_MAX]; 5846c52157fSTomohiro Misono static struct btrfs_feature_attr btrfs_feature_attrs[FEAT_MAX][NUM_FEATURE_BITS]; 585e453d989SJeff Mahoney 5866c52157fSTomohiro Misono static const u64 supported_feature_masks[FEAT_MAX] = { 587e453d989SJeff Mahoney [FEAT_COMPAT] = BTRFS_FEATURE_COMPAT_SUPP, 588e453d989SJeff Mahoney [FEAT_COMPAT_RO] = BTRFS_FEATURE_COMPAT_RO_SUPP, 589e453d989SJeff Mahoney [FEAT_INCOMPAT] = BTRFS_FEATURE_INCOMPAT_SUPP, 590e453d989SJeff Mahoney }; 591e453d989SJeff Mahoney 592e453d989SJeff Mahoney static int addrm_unknown_feature_attrs(struct btrfs_fs_info *fs_info, bool add) 5935ac1d209SJeff Mahoney { 594e453d989SJeff Mahoney int set; 595e453d989SJeff Mahoney 596e453d989SJeff Mahoney for (set = 0; set < FEAT_MAX; set++) { 597e453d989SJeff Mahoney int i; 598e453d989SJeff Mahoney struct attribute *attrs[2]; 599e453d989SJeff Mahoney struct attribute_group agroup = { 600e453d989SJeff Mahoney .name = "features", 601e453d989SJeff Mahoney .attrs = attrs, 602e453d989SJeff Mahoney }; 603e453d989SJeff Mahoney u64 features = get_features(fs_info, set); 604e453d989SJeff Mahoney features &= ~supported_feature_masks[set]; 605e453d989SJeff Mahoney 606e453d989SJeff Mahoney if (!features) 607e453d989SJeff Mahoney continue; 608e453d989SJeff Mahoney 609e453d989SJeff Mahoney attrs[1] = NULL; 610e453d989SJeff Mahoney for (i = 0; i < NUM_FEATURE_BITS; i++) { 611e453d989SJeff Mahoney struct btrfs_feature_attr *fa; 612e453d989SJeff Mahoney 613e453d989SJeff Mahoney if (!(features & (1ULL << i))) 614e453d989SJeff Mahoney continue; 615e453d989SJeff Mahoney 616e453d989SJeff Mahoney fa = &btrfs_feature_attrs[set][i]; 617e453d989SJeff Mahoney attrs[0] = &fa->kobj_attr.attr; 618e453d989SJeff Mahoney if (add) { 619e453d989SJeff Mahoney int ret; 620c1b7e474SAnand Jain ret = sysfs_merge_group(&fs_info->fs_devices->fsid_kobj, 621e453d989SJeff Mahoney &agroup); 622e453d989SJeff Mahoney if (ret) 623e453d989SJeff Mahoney return ret; 624e453d989SJeff Mahoney } else 625c1b7e474SAnand Jain sysfs_unmerge_group(&fs_info->fs_devices->fsid_kobj, 626e453d989SJeff Mahoney &agroup); 627e453d989SJeff Mahoney } 628e453d989SJeff Mahoney 629e453d989SJeff Mahoney } 630e453d989SJeff Mahoney return 0; 631e453d989SJeff Mahoney } 632e453d989SJeff Mahoney 6332e3e1281SAnand Jain static void __btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs) 634e453d989SJeff Mahoney { 6352e7910d6SAnand Jain if (fs_devs->device_dir_kobj) { 6362e7910d6SAnand Jain kobject_del(fs_devs->device_dir_kobj); 6372e7910d6SAnand Jain kobject_put(fs_devs->device_dir_kobj); 6382e7910d6SAnand Jain fs_devs->device_dir_kobj = NULL; 639aaf13305SAnand Jain } 640aaf13305SAnand Jain 641c1b7e474SAnand Jain if (fs_devs->fsid_kobj.state_initialized) { 642c1b7e474SAnand Jain kobject_del(&fs_devs->fsid_kobj); 643c1b7e474SAnand Jain kobject_put(&fs_devs->fsid_kobj); 6442e7910d6SAnand Jain wait_for_completion(&fs_devs->kobj_unregister); 6455ac1d209SJeff Mahoney } 646f90fc547SAnand Jain } 6475ac1d209SJeff Mahoney 6482e3e1281SAnand Jain /* when fs_devs is NULL it will remove all fsid kobject */ 6491d1c1be3SAnand Jain void btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs) 6502e3e1281SAnand Jain { 6512e3e1281SAnand Jain struct list_head *fs_uuids = btrfs_get_fs_uuids(); 6522e3e1281SAnand Jain 6532e3e1281SAnand Jain if (fs_devs) { 6542e3e1281SAnand Jain __btrfs_sysfs_remove_fsid(fs_devs); 6552e3e1281SAnand Jain return; 6562e3e1281SAnand Jain } 6572e3e1281SAnand Jain 658c4babc5eSAnand Jain list_for_each_entry(fs_devs, fs_uuids, fs_list) { 6592e3e1281SAnand Jain __btrfs_sysfs_remove_fsid(fs_devs); 6602e3e1281SAnand Jain } 6612e3e1281SAnand Jain } 6622e3e1281SAnand Jain 6636618a59bSAnand Jain void btrfs_sysfs_remove_mounted(struct btrfs_fs_info *fs_info) 664e453d989SJeff Mahoney { 6655a13f430SAnand Jain btrfs_reset_fs_info_ptr(fs_info); 6665a13f430SAnand Jain 667e453d989SJeff Mahoney if (fs_info->space_info_kobj) { 668e453d989SJeff Mahoney sysfs_remove_files(fs_info->space_info_kobj, allocation_attrs); 669e453d989SJeff Mahoney kobject_del(fs_info->space_info_kobj); 670e453d989SJeff Mahoney kobject_put(fs_info->space_info_kobj); 671e453d989SJeff Mahoney } 672e453d989SJeff Mahoney addrm_unknown_feature_attrs(fs_info, false); 673c1b7e474SAnand Jain sysfs_remove_group(&fs_info->fs_devices->fsid_kobj, &btrfs_feature_attr_group); 674c1b7e474SAnand Jain sysfs_remove_files(&fs_info->fs_devices->fsid_kobj, btrfs_attrs); 67532576040SAnand Jain btrfs_sysfs_rm_device_link(fs_info->fs_devices, NULL); 676e453d989SJeff Mahoney } 677e453d989SJeff Mahoney 6786c52157fSTomohiro Misono const char * const btrfs_feature_set_names[FEAT_MAX] = { 67979da4fa4SJeff Mahoney [FEAT_COMPAT] = "compat", 68079da4fa4SJeff Mahoney [FEAT_COMPAT_RO] = "compat_ro", 68179da4fa4SJeff Mahoney [FEAT_INCOMPAT] = "incompat", 68279da4fa4SJeff Mahoney }; 68379da4fa4SJeff Mahoney 6843b02a68aSJeff Mahoney char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags) 6853b02a68aSJeff Mahoney { 6863b02a68aSJeff Mahoney size_t bufsize = 4096; /* safe max, 64 names * 64 bytes */ 6873b02a68aSJeff Mahoney int len = 0; 6883b02a68aSJeff Mahoney int i; 6893b02a68aSJeff Mahoney char *str; 6903b02a68aSJeff Mahoney 6913b02a68aSJeff Mahoney str = kmalloc(bufsize, GFP_KERNEL); 6923b02a68aSJeff Mahoney if (!str) 6933b02a68aSJeff Mahoney return str; 6943b02a68aSJeff Mahoney 6953b02a68aSJeff Mahoney for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { 6963b02a68aSJeff Mahoney const char *name; 6973b02a68aSJeff Mahoney 6983b02a68aSJeff Mahoney if (!(flags & (1ULL << i))) 6993b02a68aSJeff Mahoney continue; 7003b02a68aSJeff Mahoney 7013b02a68aSJeff Mahoney name = btrfs_feature_attrs[set][i].kobj_attr.attr.name; 7023b02a68aSJeff Mahoney len += snprintf(str + len, bufsize - len, "%s%s", 7033b02a68aSJeff Mahoney len ? "," : "", name); 7043b02a68aSJeff Mahoney } 7053b02a68aSJeff Mahoney 7063b02a68aSJeff Mahoney return str; 7073b02a68aSJeff Mahoney } 7083b02a68aSJeff Mahoney 70979da4fa4SJeff Mahoney static void init_feature_attrs(void) 71079da4fa4SJeff Mahoney { 71179da4fa4SJeff Mahoney struct btrfs_feature_attr *fa; 71279da4fa4SJeff Mahoney int set, i; 71379da4fa4SJeff Mahoney 71479da4fa4SJeff Mahoney BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names) != 71579da4fa4SJeff Mahoney ARRAY_SIZE(btrfs_feature_attrs)); 71679da4fa4SJeff Mahoney BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names[0]) != 71779da4fa4SJeff Mahoney ARRAY_SIZE(btrfs_feature_attrs[0])); 71879da4fa4SJeff Mahoney 7193b02a68aSJeff Mahoney memset(btrfs_feature_attrs, 0, sizeof(btrfs_feature_attrs)); 7203b02a68aSJeff Mahoney memset(btrfs_unknown_feature_names, 0, 7213b02a68aSJeff Mahoney sizeof(btrfs_unknown_feature_names)); 7223b02a68aSJeff Mahoney 72379da4fa4SJeff Mahoney for (i = 0; btrfs_supported_feature_attrs[i]; i++) { 72479da4fa4SJeff Mahoney struct btrfs_feature_attr *sfa; 72579da4fa4SJeff Mahoney struct attribute *a = btrfs_supported_feature_attrs[i]; 7263b02a68aSJeff Mahoney int bit; 72779da4fa4SJeff Mahoney sfa = attr_to_btrfs_feature_attr(a); 7283b02a68aSJeff Mahoney bit = ilog2(sfa->feature_bit); 7293b02a68aSJeff Mahoney fa = &btrfs_feature_attrs[sfa->feature_set][bit]; 73079da4fa4SJeff Mahoney 73179da4fa4SJeff Mahoney fa->kobj_attr.attr.name = sfa->kobj_attr.attr.name; 73279da4fa4SJeff Mahoney } 73379da4fa4SJeff Mahoney 73479da4fa4SJeff Mahoney for (set = 0; set < FEAT_MAX; set++) { 73579da4fa4SJeff Mahoney for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { 73679da4fa4SJeff Mahoney char *name = btrfs_unknown_feature_names[set][i]; 73779da4fa4SJeff Mahoney fa = &btrfs_feature_attrs[set][i]; 73879da4fa4SJeff Mahoney 73979da4fa4SJeff Mahoney if (fa->kobj_attr.attr.name) 74079da4fa4SJeff Mahoney continue; 74179da4fa4SJeff Mahoney 7426c52157fSTomohiro Misono snprintf(name, BTRFS_FEATURE_NAME_MAX, "%s:%u", 74379da4fa4SJeff Mahoney btrfs_feature_set_names[set], i); 74479da4fa4SJeff Mahoney 74579da4fa4SJeff Mahoney fa->kobj_attr.attr.name = name; 74679da4fa4SJeff Mahoney fa->kobj_attr.attr.mode = S_IRUGO; 74779da4fa4SJeff Mahoney fa->feature_set = set; 74879da4fa4SJeff Mahoney fa->feature_bit = 1ULL << i; 74979da4fa4SJeff Mahoney } 75079da4fa4SJeff Mahoney } 75179da4fa4SJeff Mahoney } 75279da4fa4SJeff Mahoney 753e7e1aa9cSAnand Jain /* when one_device is NULL, it removes all device links */ 754e7e1aa9cSAnand Jain 75532576040SAnand Jain int btrfs_sysfs_rm_device_link(struct btrfs_fs_devices *fs_devices, 75699994cdeSAnand Jain struct btrfs_device *one_device) 75799994cdeSAnand Jain { 75899994cdeSAnand Jain struct hd_struct *disk; 75999994cdeSAnand Jain struct kobject *disk_kobj; 76099994cdeSAnand Jain 7616c14a164SAnand Jain if (!fs_devices->device_dir_kobj) 76299994cdeSAnand Jain return -EINVAL; 76399994cdeSAnand Jain 76487fa3bb0SLiu Bo if (one_device && one_device->bdev) { 76599994cdeSAnand Jain disk = one_device->bdev->bd_part; 76699994cdeSAnand Jain disk_kobj = &part_to_dev(disk)->kobj; 76799994cdeSAnand Jain 7686c14a164SAnand Jain sysfs_remove_link(fs_devices->device_dir_kobj, 76999994cdeSAnand Jain disk_kobj->name); 77099994cdeSAnand Jain } 77199994cdeSAnand Jain 772e7e1aa9cSAnand Jain if (one_device) 773e7e1aa9cSAnand Jain return 0; 774e7e1aa9cSAnand Jain 775e7e1aa9cSAnand Jain list_for_each_entry(one_device, 7766c14a164SAnand Jain &fs_devices->devices, dev_list) { 777e7e1aa9cSAnand Jain if (!one_device->bdev) 778e7e1aa9cSAnand Jain continue; 779e7e1aa9cSAnand Jain disk = one_device->bdev->bd_part; 780e7e1aa9cSAnand Jain disk_kobj = &part_to_dev(disk)->kobj; 781e7e1aa9cSAnand Jain 7826c14a164SAnand Jain sysfs_remove_link(fs_devices->device_dir_kobj, 783e7e1aa9cSAnand Jain disk_kobj->name); 784e7e1aa9cSAnand Jain } 785e7e1aa9cSAnand Jain 78699994cdeSAnand Jain return 0; 78799994cdeSAnand Jain } 78899994cdeSAnand Jain 7892e7910d6SAnand Jain int btrfs_sysfs_add_device(struct btrfs_fs_devices *fs_devs) 79000c921c2SAnand Jain { 7912e7910d6SAnand Jain if (!fs_devs->device_dir_kobj) 7922e7910d6SAnand Jain fs_devs->device_dir_kobj = kobject_create_and_add("devices", 793c1b7e474SAnand Jain &fs_devs->fsid_kobj); 79400c921c2SAnand Jain 7952e7910d6SAnand Jain if (!fs_devs->device_dir_kobj) 79600c921c2SAnand Jain return -ENOMEM; 79700c921c2SAnand Jain 79800c921c2SAnand Jain return 0; 79900c921c2SAnand Jain } 80000c921c2SAnand Jain 801e3bd6973SAnand Jain int btrfs_sysfs_add_device_link(struct btrfs_fs_devices *fs_devices, 8020d39376aSAnand Jain struct btrfs_device *one_device) 80329e5be24SJeff Mahoney { 80429e5be24SJeff Mahoney int error = 0; 80529e5be24SJeff Mahoney struct btrfs_device *dev; 80629e5be24SJeff Mahoney 80729e5be24SJeff Mahoney list_for_each_entry(dev, &fs_devices->devices, dev_list) { 808f085381eSAnand Jain struct hd_struct *disk; 809f085381eSAnand Jain struct kobject *disk_kobj; 810f085381eSAnand Jain 811f085381eSAnand Jain if (!dev->bdev) 812f085381eSAnand Jain continue; 813f085381eSAnand Jain 8140d39376aSAnand Jain if (one_device && one_device != dev) 8150d39376aSAnand Jain continue; 8160d39376aSAnand Jain 817f085381eSAnand Jain disk = dev->bdev->bd_part; 818f085381eSAnand Jain disk_kobj = &part_to_dev(disk)->kobj; 81929e5be24SJeff Mahoney 8202e7910d6SAnand Jain error = sysfs_create_link(fs_devices->device_dir_kobj, 82129e5be24SJeff Mahoney disk_kobj, disk_kobj->name); 82229e5be24SJeff Mahoney if (error) 82329e5be24SJeff Mahoney break; 82429e5be24SJeff Mahoney } 82529e5be24SJeff Mahoney 82629e5be24SJeff Mahoney return error; 82729e5be24SJeff Mahoney } 82829e5be24SJeff Mahoney 829510d7360SJeff Mahoney /* /sys/fs/btrfs/ entry */ 830510d7360SJeff Mahoney static struct kset *btrfs_kset; 831510d7360SJeff Mahoney 8321bae3098SDavid Sterba /* /sys/kernel/debug/btrfs */ 8331bae3098SDavid Sterba static struct dentry *btrfs_debugfs_root_dentry; 8341bae3098SDavid Sterba 8351bae3098SDavid Sterba /* Debugging tunables and exported data */ 8361bae3098SDavid Sterba u64 btrfs_debugfs_test; 8371bae3098SDavid Sterba 83872059215SAnand Jain /* 83972059215SAnand Jain * Can be called by the device discovery thread. 84072059215SAnand Jain * And parent can be specified for seed device 84172059215SAnand Jain */ 8420c10e2d4SAnand Jain int btrfs_sysfs_add_fsid(struct btrfs_fs_devices *fs_devs, 84372059215SAnand Jain struct kobject *parent) 8445ac1d209SJeff Mahoney { 8455ac1d209SJeff Mahoney int error; 8465ac1d209SJeff Mahoney 8472e7910d6SAnand Jain init_completion(&fs_devs->kobj_unregister); 848c1b7e474SAnand Jain fs_devs->fsid_kobj.kset = btrfs_kset; 849c1b7e474SAnand Jain error = kobject_init_and_add(&fs_devs->fsid_kobj, 85024bd69cbSAnand Jain &btrfs_ktype, parent, "%pU", fs_devs->fsid); 851e3277335STobin C. Harding if (error) { 852e3277335STobin C. Harding kobject_put(&fs_devs->fsid_kobj); 85372059215SAnand Jain return error; 85472059215SAnand Jain } 85572059215SAnand Jain 856e3277335STobin C. Harding return 0; 857e3277335STobin C. Harding } 858e3277335STobin C. Harding 85996f3136eSAnand Jain int btrfs_sysfs_add_mounted(struct btrfs_fs_info *fs_info) 86072059215SAnand Jain { 86172059215SAnand Jain int error; 8622e7910d6SAnand Jain struct btrfs_fs_devices *fs_devs = fs_info->fs_devices; 863c1b7e474SAnand Jain struct kobject *fsid_kobj = &fs_devs->fsid_kobj; 86472059215SAnand Jain 8655a13f430SAnand Jain btrfs_set_fs_info_ptr(fs_info); 8665a13f430SAnand Jain 867e3bd6973SAnand Jain error = btrfs_sysfs_add_device_link(fs_devs, NULL); 868e453d989SJeff Mahoney if (error) 869e453d989SJeff Mahoney return error; 870510d7360SJeff Mahoney 871c1b7e474SAnand Jain error = sysfs_create_files(fsid_kobj, btrfs_attrs); 872e453d989SJeff Mahoney if (error) { 87332576040SAnand Jain btrfs_sysfs_rm_device_link(fs_devs, NULL); 874e453d989SJeff Mahoney return error; 875e453d989SJeff Mahoney } 87679da4fa4SJeff Mahoney 877c1b7e474SAnand Jain error = sysfs_create_group(fsid_kobj, 8780dd2906fSAnand Jain &btrfs_feature_attr_group); 8790dd2906fSAnand Jain if (error) 8800dd2906fSAnand Jain goto failure; 8810dd2906fSAnand Jain 8826e369febSDavid Sterba #ifdef CONFIG_BTRFS_DEBUG 8836e369febSDavid Sterba error = sysfs_create_group(fsid_kobj, 8846e369febSDavid Sterba &btrfs_debug_feature_attr_group); 8856e369febSDavid Sterba if (error) 8866e369febSDavid Sterba goto failure; 8876e369febSDavid Sterba #endif 8886e369febSDavid Sterba 889e453d989SJeff Mahoney error = addrm_unknown_feature_attrs(fs_info, true); 89079da4fa4SJeff Mahoney if (error) 89179da4fa4SJeff Mahoney goto failure; 89279da4fa4SJeff Mahoney 8936ab0a202SJeff Mahoney fs_info->space_info_kobj = kobject_create_and_add("allocation", 894c1b7e474SAnand Jain fsid_kobj); 8956ab0a202SJeff Mahoney if (!fs_info->space_info_kobj) { 8966ab0a202SJeff Mahoney error = -ENOMEM; 8976ab0a202SJeff Mahoney goto failure; 8986ab0a202SJeff Mahoney } 8996ab0a202SJeff Mahoney 9006ab0a202SJeff Mahoney error = sysfs_create_files(fs_info->space_info_kobj, allocation_attrs); 9016ab0a202SJeff Mahoney if (error) 9026ab0a202SJeff Mahoney goto failure; 9036ab0a202SJeff Mahoney 90479da4fa4SJeff Mahoney return 0; 90579da4fa4SJeff Mahoney failure: 9066618a59bSAnand Jain btrfs_sysfs_remove_mounted(fs_info); 9075ac1d209SJeff Mahoney return error; 9085ac1d209SJeff Mahoney } 9095ac1d209SJeff Mahoney 910444e7516SDavid Sterba 911444e7516SDavid Sterba /* 912444e7516SDavid Sterba * Change per-fs features in /sys/fs/btrfs/UUID/features to match current 913444e7516SDavid Sterba * values in superblock. Call after any changes to incompat/compat_ro flags 914444e7516SDavid Sterba */ 915444e7516SDavid Sterba void btrfs_sysfs_feature_update(struct btrfs_fs_info *fs_info, 916444e7516SDavid Sterba u64 bit, enum btrfs_feature_set set) 917444e7516SDavid Sterba { 918444e7516SDavid Sterba struct btrfs_fs_devices *fs_devs; 919444e7516SDavid Sterba struct kobject *fsid_kobj; 920444e7516SDavid Sterba u64 features; 921444e7516SDavid Sterba int ret; 922444e7516SDavid Sterba 923444e7516SDavid Sterba if (!fs_info) 924444e7516SDavid Sterba return; 925444e7516SDavid Sterba 926444e7516SDavid Sterba features = get_features(fs_info, set); 927444e7516SDavid Sterba ASSERT(bit & supported_feature_masks[set]); 928444e7516SDavid Sterba 929444e7516SDavid Sterba fs_devs = fs_info->fs_devices; 930444e7516SDavid Sterba fsid_kobj = &fs_devs->fsid_kobj; 931444e7516SDavid Sterba 932bf609206SDavid Sterba if (!fsid_kobj->state_initialized) 933bf609206SDavid Sterba return; 934bf609206SDavid Sterba 935444e7516SDavid Sterba /* 936444e7516SDavid Sterba * FIXME: this is too heavy to update just one value, ideally we'd like 937444e7516SDavid Sterba * to use sysfs_update_group but some refactoring is needed first. 938444e7516SDavid Sterba */ 939444e7516SDavid Sterba sysfs_remove_group(fsid_kobj, &btrfs_feature_attr_group); 940444e7516SDavid Sterba ret = sysfs_create_group(fsid_kobj, &btrfs_feature_attr_group); 941444e7516SDavid Sterba } 942444e7516SDavid Sterba 94336b7ee4dSGreg Kroah-Hartman static void btrfs_init_debugfs(void) 9441bae3098SDavid Sterba { 9451bae3098SDavid Sterba #ifdef CONFIG_DEBUG_FS 9461bae3098SDavid Sterba btrfs_debugfs_root_dentry = debugfs_create_dir("btrfs", NULL); 9471bae3098SDavid Sterba 948b0de6c4cSDavid Sterba /* 949b0de6c4cSDavid Sterba * Example code, how to export data through debugfs. 950b0de6c4cSDavid Sterba * 951b0de6c4cSDavid Sterba * file: /sys/kernel/debug/btrfs/test 952b0de6c4cSDavid Sterba * contents of: btrfs_debugfs_test 953b0de6c4cSDavid Sterba */ 954b0de6c4cSDavid Sterba #ifdef CONFIG_BTRFS_DEBUG 95507f6a480SEric Sandeen debugfs_create_u64("test", S_IRUGO | S_IWUSR, btrfs_debugfs_root_dentry, 9561bae3098SDavid Sterba &btrfs_debugfs_test); 9571bae3098SDavid Sterba #endif 958b0de6c4cSDavid Sterba 959b0de6c4cSDavid Sterba #endif 9601bae3098SDavid Sterba } 9611bae3098SDavid Sterba 962f5c29bd9SLiu Bo int __init btrfs_init_sysfs(void) 96358176a96SJosef Bacik { 964079b72bcSJeff Mahoney int ret; 9651bae3098SDavid Sterba 966e3fe4e71SGreg KH btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj); 967e3fe4e71SGreg KH if (!btrfs_kset) 968e3fe4e71SGreg KH return -ENOMEM; 969079b72bcSJeff Mahoney 97036b7ee4dSGreg Kroah-Hartman btrfs_init_debugfs(); 971079b72bcSJeff Mahoney 9721bae3098SDavid Sterba init_feature_attrs(); 9731bae3098SDavid Sterba ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); 974001a648dSFilipe Manana if (ret) 975001a648dSFilipe Manana goto out2; 976f902bd3aSMisono Tomohiro ret = sysfs_merge_group(&btrfs_kset->kobj, 977f902bd3aSMisono Tomohiro &btrfs_static_feature_attr_group); 978f902bd3aSMisono Tomohiro if (ret) 979f902bd3aSMisono Tomohiro goto out_remove_group; 980001a648dSFilipe Manana 9816e369febSDavid Sterba #ifdef CONFIG_BTRFS_DEBUG 9826e369febSDavid Sterba ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_debug_feature_attr_group); 9836e369febSDavid Sterba if (ret) 9846e369febSDavid Sterba goto out2; 9856e369febSDavid Sterba #endif 9866e369febSDavid Sterba 987001a648dSFilipe Manana return 0; 988f902bd3aSMisono Tomohiro 989f902bd3aSMisono Tomohiro out_remove_group: 990f902bd3aSMisono Tomohiro sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); 991001a648dSFilipe Manana out2: 992001a648dSFilipe Manana debugfs_remove_recursive(btrfs_debugfs_root_dentry); 993001a648dSFilipe Manana kset_unregister(btrfs_kset); 9941bae3098SDavid Sterba 9951bae3098SDavid Sterba return ret; 99658176a96SJosef Bacik } 99758176a96SJosef Bacik 998e67c718bSDavid Sterba void __cold btrfs_exit_sysfs(void) 99958176a96SJosef Bacik { 1000f902bd3aSMisono Tomohiro sysfs_unmerge_group(&btrfs_kset->kobj, 1001f902bd3aSMisono Tomohiro &btrfs_static_feature_attr_group); 1002079b72bcSJeff Mahoney sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); 1003e3fe4e71SGreg KH kset_unregister(btrfs_kset); 10041bae3098SDavid Sterba debugfs_remove_recursive(btrfs_debugfs_root_dentry); 100558176a96SJosef Bacik } 100655d47414SChris Mason 1007