16cbd5570SChris Mason /* 26cbd5570SChris Mason * Copyright (C) 2007 Oracle. All rights reserved. 36cbd5570SChris Mason * 46cbd5570SChris Mason * This program is free software; you can redistribute it and/or 56cbd5570SChris Mason * modify it under the terms of the GNU General Public 66cbd5570SChris Mason * License v2 as published by the Free Software Foundation. 76cbd5570SChris Mason * 86cbd5570SChris Mason * This program is distributed in the hope that it will be useful, 96cbd5570SChris Mason * but WITHOUT ANY WARRANTY; without even the implied warranty of 106cbd5570SChris Mason * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 116cbd5570SChris Mason * General Public License for more details. 126cbd5570SChris Mason * 136cbd5570SChris Mason * You should have received a copy of the GNU General Public 146cbd5570SChris Mason * License along with this program; if not, write to the 156cbd5570SChris Mason * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 166cbd5570SChris Mason * Boston, MA 021110-1307, USA. 176cbd5570SChris Mason */ 186cbd5570SChris Mason 1958176a96SJosef Bacik #include <linux/sched.h> 2058176a96SJosef Bacik #include <linux/slab.h> 2158176a96SJosef Bacik #include <linux/spinlock.h> 2258176a96SJosef Bacik #include <linux/completion.h> 2358176a96SJosef Bacik #include <linux/buffer_head.h> 2458176a96SJosef Bacik #include <linux/kobject.h> 2579da4fa4SJeff Mahoney #include <linux/bug.h> 2629e5be24SJeff Mahoney #include <linux/genhd.h> 271bae3098SDavid Sterba #include <linux/debugfs.h> 2858176a96SJosef Bacik 29bae45de0SChris Mason #include "ctree.h" 30bae45de0SChris Mason #include "disk-io.h" 31bae45de0SChris Mason #include "transaction.h" 32079b72bcSJeff Mahoney #include "sysfs.h" 3329e5be24SJeff Mahoney #include "volumes.h" 34079b72bcSJeff Mahoney 35510d7360SJeff Mahoney static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj); 362e7910d6SAnand Jain static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj); 375ac1d209SJeff Mahoney 38510d7360SJeff Mahoney static u64 get_features(struct btrfs_fs_info *fs_info, 39510d7360SJeff Mahoney enum btrfs_feature_set set) 405ac1d209SJeff Mahoney { 41510d7360SJeff Mahoney struct btrfs_super_block *disk_super = fs_info->super_copy; 42510d7360SJeff Mahoney if (set == FEAT_COMPAT) 43510d7360SJeff Mahoney return btrfs_super_compat_flags(disk_super); 44510d7360SJeff Mahoney else if (set == FEAT_COMPAT_RO) 45510d7360SJeff Mahoney return btrfs_super_compat_ro_flags(disk_super); 46510d7360SJeff Mahoney else 47510d7360SJeff Mahoney return btrfs_super_incompat_flags(disk_super); 485ac1d209SJeff Mahoney } 495ac1d209SJeff Mahoney 50ba631941SJeff Mahoney static void set_features(struct btrfs_fs_info *fs_info, 51ba631941SJeff Mahoney enum btrfs_feature_set set, u64 features) 52ba631941SJeff Mahoney { 53ba631941SJeff Mahoney struct btrfs_super_block *disk_super = fs_info->super_copy; 54ba631941SJeff Mahoney if (set == FEAT_COMPAT) 55ba631941SJeff Mahoney btrfs_set_super_compat_flags(disk_super, features); 56ba631941SJeff Mahoney else if (set == FEAT_COMPAT_RO) 57ba631941SJeff Mahoney btrfs_set_super_compat_ro_flags(disk_super, features); 58ba631941SJeff Mahoney else 59ba631941SJeff Mahoney btrfs_set_super_incompat_flags(disk_super, features); 60ba631941SJeff Mahoney } 61ba631941SJeff Mahoney 62ba631941SJeff Mahoney static int can_modify_feature(struct btrfs_feature_attr *fa) 63ba631941SJeff Mahoney { 64ba631941SJeff Mahoney int val = 0; 65ba631941SJeff Mahoney u64 set, clear; 66ba631941SJeff Mahoney switch (fa->feature_set) { 67ba631941SJeff Mahoney case FEAT_COMPAT: 68ba631941SJeff Mahoney set = BTRFS_FEATURE_COMPAT_SAFE_SET; 69ba631941SJeff Mahoney clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR; 70ba631941SJeff Mahoney break; 71ba631941SJeff Mahoney case FEAT_COMPAT_RO: 72ba631941SJeff Mahoney set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET; 73ba631941SJeff Mahoney clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR; 74ba631941SJeff Mahoney break; 75ba631941SJeff Mahoney case FEAT_INCOMPAT: 76ba631941SJeff Mahoney set = BTRFS_FEATURE_INCOMPAT_SAFE_SET; 77ba631941SJeff Mahoney clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR; 78ba631941SJeff Mahoney break; 79ba631941SJeff Mahoney default: 80cc37bb04SDavid Sterba printk(KERN_WARNING "btrfs: sysfs: unknown feature set %d\n", 81cc37bb04SDavid Sterba fa->feature_set); 82cc37bb04SDavid Sterba return 0; 83ba631941SJeff Mahoney } 84ba631941SJeff Mahoney 85ba631941SJeff Mahoney if (set & fa->feature_bit) 86ba631941SJeff Mahoney val |= 1; 87ba631941SJeff Mahoney if (clear & fa->feature_bit) 88ba631941SJeff Mahoney val |= 2; 89ba631941SJeff Mahoney 90ba631941SJeff Mahoney return val; 91ba631941SJeff Mahoney } 92ba631941SJeff Mahoney 93079b72bcSJeff Mahoney static ssize_t btrfs_feature_attr_show(struct kobject *kobj, 94079b72bcSJeff Mahoney struct kobj_attribute *a, char *buf) 95079b72bcSJeff Mahoney { 96510d7360SJeff Mahoney int val = 0; 97510d7360SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj); 98510d7360SJeff Mahoney struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a); 99ba631941SJeff Mahoney if (fs_info) { 100510d7360SJeff Mahoney u64 features = get_features(fs_info, fa->feature_set); 101510d7360SJeff Mahoney if (features & fa->feature_bit) 102510d7360SJeff Mahoney val = 1; 103ba631941SJeff Mahoney } else 104ba631941SJeff Mahoney val = can_modify_feature(fa); 105510d7360SJeff Mahoney 106510d7360SJeff Mahoney return snprintf(buf, PAGE_SIZE, "%d\n", val); 107510d7360SJeff Mahoney } 108510d7360SJeff Mahoney 109ba631941SJeff Mahoney static ssize_t btrfs_feature_attr_store(struct kobject *kobj, 110ba631941SJeff Mahoney struct kobj_attribute *a, 111ba631941SJeff Mahoney const char *buf, size_t count) 112ba631941SJeff Mahoney { 113ba631941SJeff Mahoney struct btrfs_fs_info *fs_info; 114ba631941SJeff Mahoney struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a); 115ba631941SJeff Mahoney u64 features, set, clear; 116ba631941SJeff Mahoney unsigned long val; 117ba631941SJeff Mahoney int ret; 118ba631941SJeff Mahoney 119ba631941SJeff Mahoney fs_info = to_fs_info(kobj); 120ba631941SJeff Mahoney if (!fs_info) 121ba631941SJeff Mahoney return -EPERM; 122ba631941SJeff Mahoney 123ba631941SJeff Mahoney ret = kstrtoul(skip_spaces(buf), 0, &val); 124ba631941SJeff Mahoney if (ret) 125ba631941SJeff Mahoney return ret; 126ba631941SJeff Mahoney 127ba631941SJeff Mahoney if (fa->feature_set == FEAT_COMPAT) { 128ba631941SJeff Mahoney set = BTRFS_FEATURE_COMPAT_SAFE_SET; 129ba631941SJeff Mahoney clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR; 130ba631941SJeff Mahoney } else if (fa->feature_set == FEAT_COMPAT_RO) { 131ba631941SJeff Mahoney set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET; 132ba631941SJeff Mahoney clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR; 133ba631941SJeff Mahoney } else { 134ba631941SJeff Mahoney set = BTRFS_FEATURE_INCOMPAT_SAFE_SET; 135ba631941SJeff Mahoney clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR; 136ba631941SJeff Mahoney } 137ba631941SJeff Mahoney 138ba631941SJeff Mahoney features = get_features(fs_info, fa->feature_set); 139ba631941SJeff Mahoney 140ba631941SJeff Mahoney /* Nothing to do */ 141ba631941SJeff Mahoney if ((val && (features & fa->feature_bit)) || 142ba631941SJeff Mahoney (!val && !(features & fa->feature_bit))) 143ba631941SJeff Mahoney return count; 144ba631941SJeff Mahoney 145ba631941SJeff Mahoney if ((val && !(set & fa->feature_bit)) || 146ba631941SJeff Mahoney (!val && !(clear & fa->feature_bit))) { 147ba631941SJeff Mahoney btrfs_info(fs_info, 148ba631941SJeff Mahoney "%sabling feature %s on mounted fs is not supported.", 149ba631941SJeff Mahoney val ? "En" : "Dis", fa->kobj_attr.attr.name); 150ba631941SJeff Mahoney return -EPERM; 151ba631941SJeff Mahoney } 152ba631941SJeff Mahoney 153ba631941SJeff Mahoney btrfs_info(fs_info, "%s %s feature flag", 154ba631941SJeff Mahoney val ? "Setting" : "Clearing", fa->kobj_attr.attr.name); 155ba631941SJeff Mahoney 156ba631941SJeff Mahoney spin_lock(&fs_info->super_lock); 157ba631941SJeff Mahoney features = get_features(fs_info, fa->feature_set); 158ba631941SJeff Mahoney if (val) 159ba631941SJeff Mahoney features |= fa->feature_bit; 160ba631941SJeff Mahoney else 161ba631941SJeff Mahoney features &= ~fa->feature_bit; 162ba631941SJeff Mahoney set_features(fs_info, fa->feature_set, features); 163ba631941SJeff Mahoney spin_unlock(&fs_info->super_lock); 164ba631941SJeff Mahoney 1650eae2747SDavid Sterba /* 1660eae2747SDavid Sterba * We don't want to do full transaction commit from inside sysfs 1670eae2747SDavid Sterba */ 1680eae2747SDavid Sterba btrfs_set_pending(fs_info, COMMIT); 1690eae2747SDavid Sterba wake_up_process(fs_info->transaction_kthread); 170ba631941SJeff Mahoney 171ba631941SJeff Mahoney return count; 172ba631941SJeff Mahoney } 173ba631941SJeff Mahoney 174510d7360SJeff Mahoney static umode_t btrfs_feature_visible(struct kobject *kobj, 175510d7360SJeff Mahoney struct attribute *attr, int unused) 176510d7360SJeff Mahoney { 177510d7360SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj); 178510d7360SJeff Mahoney umode_t mode = attr->mode; 179510d7360SJeff Mahoney 180510d7360SJeff Mahoney if (fs_info) { 181510d7360SJeff Mahoney struct btrfs_feature_attr *fa; 182510d7360SJeff Mahoney u64 features; 183510d7360SJeff Mahoney 184510d7360SJeff Mahoney fa = attr_to_btrfs_feature_attr(attr); 185510d7360SJeff Mahoney features = get_features(fs_info, fa->feature_set); 186510d7360SJeff Mahoney 187ba631941SJeff Mahoney if (can_modify_feature(fa)) 188ba631941SJeff Mahoney mode |= S_IWUSR; 189ba631941SJeff Mahoney else if (!(features & fa->feature_bit)) 190510d7360SJeff Mahoney mode = 0; 191510d7360SJeff Mahoney } 192510d7360SJeff Mahoney 193510d7360SJeff Mahoney return mode; 194079b72bcSJeff Mahoney } 195079b72bcSJeff Mahoney 196079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(mixed_backref, MIXED_BACKREF); 197079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(default_subvol, DEFAULT_SUBVOL); 198079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(mixed_groups, MIXED_GROUPS); 199079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(compress_lzo, COMPRESS_LZO); 200079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(big_metadata, BIG_METADATA); 201079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(extended_iref, EXTENDED_IREF); 202079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(raid56, RAID56); 203079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(skinny_metadata, SKINNY_METADATA); 204c736c095SDavid Sterba BTRFS_FEAT_ATTR_INCOMPAT(no_holes, NO_HOLES); 205079b72bcSJeff Mahoney 206079b72bcSJeff Mahoney static struct attribute *btrfs_supported_feature_attrs[] = { 207079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(mixed_backref), 208079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(default_subvol), 209079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(mixed_groups), 210079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(compress_lzo), 211079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(big_metadata), 212079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(extended_iref), 213079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(raid56), 214079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(skinny_metadata), 215c736c095SDavid Sterba BTRFS_FEAT_ATTR_PTR(no_holes), 216079b72bcSJeff Mahoney NULL 217079b72bcSJeff Mahoney }; 218079b72bcSJeff Mahoney 219079b72bcSJeff Mahoney static const struct attribute_group btrfs_feature_attr_group = { 220079b72bcSJeff Mahoney .name = "features", 221510d7360SJeff Mahoney .is_visible = btrfs_feature_visible, 222079b72bcSJeff Mahoney .attrs = btrfs_supported_feature_attrs, 223079b72bcSJeff Mahoney }; 22458176a96SJosef Bacik 2256ab0a202SJeff Mahoney static ssize_t btrfs_show_u64(u64 *value_ptr, spinlock_t *lock, char *buf) 2266ab0a202SJeff Mahoney { 2276ab0a202SJeff Mahoney u64 val; 2286ab0a202SJeff Mahoney if (lock) 2296ab0a202SJeff Mahoney spin_lock(lock); 2306ab0a202SJeff Mahoney val = *value_ptr; 2316ab0a202SJeff Mahoney if (lock) 2326ab0a202SJeff Mahoney spin_unlock(lock); 2336ab0a202SJeff Mahoney return snprintf(buf, PAGE_SIZE, "%llu\n", val); 2346ab0a202SJeff Mahoney } 2356ab0a202SJeff Mahoney 2366ab0a202SJeff Mahoney static ssize_t global_rsv_size_show(struct kobject *kobj, 2376ab0a202SJeff Mahoney struct kobj_attribute *ka, char *buf) 2386ab0a202SJeff Mahoney { 2396ab0a202SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); 2406ab0a202SJeff Mahoney struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 2416ab0a202SJeff Mahoney return btrfs_show_u64(&block_rsv->size, &block_rsv->lock, buf); 2426ab0a202SJeff Mahoney } 24398b3d389SAnand Jain BTRFS_ATTR(global_rsv_size, global_rsv_size_show); 2446ab0a202SJeff Mahoney 2456ab0a202SJeff Mahoney static ssize_t global_rsv_reserved_show(struct kobject *kobj, 2466ab0a202SJeff Mahoney struct kobj_attribute *a, char *buf) 2476ab0a202SJeff Mahoney { 2486ab0a202SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); 2496ab0a202SJeff Mahoney struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 2506ab0a202SJeff Mahoney return btrfs_show_u64(&block_rsv->reserved, &block_rsv->lock, buf); 2516ab0a202SJeff Mahoney } 25298b3d389SAnand Jain BTRFS_ATTR(global_rsv_reserved, global_rsv_reserved_show); 2536ab0a202SJeff Mahoney 2546ab0a202SJeff Mahoney #define to_space_info(_kobj) container_of(_kobj, struct btrfs_space_info, kobj) 255c1895442SJeff Mahoney #define to_raid_kobj(_kobj) container_of(_kobj, struct raid_kobject, kobj) 2566ab0a202SJeff Mahoney 2576ab0a202SJeff Mahoney static ssize_t raid_bytes_show(struct kobject *kobj, 2586ab0a202SJeff Mahoney struct kobj_attribute *attr, char *buf); 2596ab0a202SJeff Mahoney BTRFS_RAID_ATTR(total_bytes, raid_bytes_show); 2606ab0a202SJeff Mahoney BTRFS_RAID_ATTR(used_bytes, raid_bytes_show); 2616ab0a202SJeff Mahoney 2626ab0a202SJeff Mahoney static ssize_t raid_bytes_show(struct kobject *kobj, 2636ab0a202SJeff Mahoney struct kobj_attribute *attr, char *buf) 2646ab0a202SJeff Mahoney 2656ab0a202SJeff Mahoney { 2666ab0a202SJeff Mahoney struct btrfs_space_info *sinfo = to_space_info(kobj->parent); 2676ab0a202SJeff Mahoney struct btrfs_block_group_cache *block_group; 268c1895442SJeff Mahoney int index = to_raid_kobj(kobj)->raid_type; 2696ab0a202SJeff Mahoney u64 val = 0; 2706ab0a202SJeff Mahoney 2716ab0a202SJeff Mahoney down_read(&sinfo->groups_sem); 2726ab0a202SJeff Mahoney list_for_each_entry(block_group, &sinfo->block_groups[index], list) { 2736ab0a202SJeff Mahoney if (&attr->attr == BTRFS_RAID_ATTR_PTR(total_bytes)) 2746ab0a202SJeff Mahoney val += block_group->key.offset; 2756ab0a202SJeff Mahoney else 2766ab0a202SJeff Mahoney val += btrfs_block_group_used(&block_group->item); 2776ab0a202SJeff Mahoney } 2786ab0a202SJeff Mahoney up_read(&sinfo->groups_sem); 2796ab0a202SJeff Mahoney return snprintf(buf, PAGE_SIZE, "%llu\n", val); 2806ab0a202SJeff Mahoney } 2816ab0a202SJeff Mahoney 2826ab0a202SJeff Mahoney static struct attribute *raid_attributes[] = { 2836ab0a202SJeff Mahoney BTRFS_RAID_ATTR_PTR(total_bytes), 2846ab0a202SJeff Mahoney BTRFS_RAID_ATTR_PTR(used_bytes), 2856ab0a202SJeff Mahoney NULL 2866ab0a202SJeff Mahoney }; 2876ab0a202SJeff Mahoney 2886ab0a202SJeff Mahoney static void release_raid_kobj(struct kobject *kobj) 2896ab0a202SJeff Mahoney { 290c1895442SJeff Mahoney kfree(to_raid_kobj(kobj)); 2916ab0a202SJeff Mahoney } 2926ab0a202SJeff Mahoney 2936ab0a202SJeff Mahoney struct kobj_type btrfs_raid_ktype = { 2946ab0a202SJeff Mahoney .sysfs_ops = &kobj_sysfs_ops, 2956ab0a202SJeff Mahoney .release = release_raid_kobj, 2966ab0a202SJeff Mahoney .default_attrs = raid_attributes, 2976ab0a202SJeff Mahoney }; 2986ab0a202SJeff Mahoney 2996ab0a202SJeff Mahoney #define SPACE_INFO_ATTR(field) \ 3006ab0a202SJeff Mahoney static ssize_t btrfs_space_info_show_##field(struct kobject *kobj, \ 3016ab0a202SJeff Mahoney struct kobj_attribute *a, \ 3026ab0a202SJeff Mahoney char *buf) \ 3036ab0a202SJeff Mahoney { \ 3046ab0a202SJeff Mahoney struct btrfs_space_info *sinfo = to_space_info(kobj); \ 3056ab0a202SJeff Mahoney return btrfs_show_u64(&sinfo->field, &sinfo->lock, buf); \ 3066ab0a202SJeff Mahoney } \ 30798b3d389SAnand Jain BTRFS_ATTR(field, btrfs_space_info_show_##field) 3086ab0a202SJeff Mahoney 3096ab0a202SJeff Mahoney static ssize_t btrfs_space_info_show_total_bytes_pinned(struct kobject *kobj, 3106ab0a202SJeff Mahoney struct kobj_attribute *a, 3116ab0a202SJeff Mahoney char *buf) 3126ab0a202SJeff Mahoney { 3136ab0a202SJeff Mahoney struct btrfs_space_info *sinfo = to_space_info(kobj); 3146ab0a202SJeff Mahoney s64 val = percpu_counter_sum(&sinfo->total_bytes_pinned); 3156ab0a202SJeff Mahoney return snprintf(buf, PAGE_SIZE, "%lld\n", val); 3166ab0a202SJeff Mahoney } 3176ab0a202SJeff Mahoney 3186ab0a202SJeff Mahoney SPACE_INFO_ATTR(flags); 3196ab0a202SJeff Mahoney SPACE_INFO_ATTR(total_bytes); 3206ab0a202SJeff Mahoney SPACE_INFO_ATTR(bytes_used); 3216ab0a202SJeff Mahoney SPACE_INFO_ATTR(bytes_pinned); 3226ab0a202SJeff Mahoney SPACE_INFO_ATTR(bytes_reserved); 3236ab0a202SJeff Mahoney SPACE_INFO_ATTR(bytes_may_use); 3246ab0a202SJeff Mahoney SPACE_INFO_ATTR(disk_used); 3256ab0a202SJeff Mahoney SPACE_INFO_ATTR(disk_total); 32698b3d389SAnand Jain BTRFS_ATTR(total_bytes_pinned, btrfs_space_info_show_total_bytes_pinned); 3276ab0a202SJeff Mahoney 3286ab0a202SJeff Mahoney static struct attribute *space_info_attrs[] = { 3296ab0a202SJeff Mahoney BTRFS_ATTR_PTR(flags), 3306ab0a202SJeff Mahoney BTRFS_ATTR_PTR(total_bytes), 3316ab0a202SJeff Mahoney BTRFS_ATTR_PTR(bytes_used), 3326ab0a202SJeff Mahoney BTRFS_ATTR_PTR(bytes_pinned), 3336ab0a202SJeff Mahoney BTRFS_ATTR_PTR(bytes_reserved), 3346ab0a202SJeff Mahoney BTRFS_ATTR_PTR(bytes_may_use), 3356ab0a202SJeff Mahoney BTRFS_ATTR_PTR(disk_used), 3366ab0a202SJeff Mahoney BTRFS_ATTR_PTR(disk_total), 3376ab0a202SJeff Mahoney BTRFS_ATTR_PTR(total_bytes_pinned), 3386ab0a202SJeff Mahoney NULL, 3396ab0a202SJeff Mahoney }; 3406ab0a202SJeff Mahoney 3416ab0a202SJeff Mahoney static void space_info_release(struct kobject *kobj) 3426ab0a202SJeff Mahoney { 3436ab0a202SJeff Mahoney struct btrfs_space_info *sinfo = to_space_info(kobj); 3446ab0a202SJeff Mahoney percpu_counter_destroy(&sinfo->total_bytes_pinned); 3456ab0a202SJeff Mahoney kfree(sinfo); 3466ab0a202SJeff Mahoney } 3476ab0a202SJeff Mahoney 3486ab0a202SJeff Mahoney struct kobj_type space_info_ktype = { 3496ab0a202SJeff Mahoney .sysfs_ops = &kobj_sysfs_ops, 3506ab0a202SJeff Mahoney .release = space_info_release, 3516ab0a202SJeff Mahoney .default_attrs = space_info_attrs, 3526ab0a202SJeff Mahoney }; 3536ab0a202SJeff Mahoney 3546ab0a202SJeff Mahoney static const struct attribute *allocation_attrs[] = { 3556ab0a202SJeff Mahoney BTRFS_ATTR_PTR(global_rsv_reserved), 3566ab0a202SJeff Mahoney BTRFS_ATTR_PTR(global_rsv_size), 3576ab0a202SJeff Mahoney NULL, 3586ab0a202SJeff Mahoney }; 3596ab0a202SJeff Mahoney 360f8ba9c11SJeff Mahoney static ssize_t btrfs_label_show(struct kobject *kobj, 361f8ba9c11SJeff Mahoney struct kobj_attribute *a, char *buf) 362f8ba9c11SJeff Mahoney { 363f8ba9c11SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj); 36448fcc3ffSSatoru Takeuchi char *label = fs_info->super_copy->label; 36548fcc3ffSSatoru Takeuchi return snprintf(buf, PAGE_SIZE, label[0] ? "%s\n" : "%s", label); 366f8ba9c11SJeff Mahoney } 367f8ba9c11SJeff Mahoney 368f8ba9c11SJeff Mahoney static ssize_t btrfs_label_store(struct kobject *kobj, 369f8ba9c11SJeff Mahoney struct kobj_attribute *a, 370f8ba9c11SJeff Mahoney const char *buf, size_t len) 371f8ba9c11SJeff Mahoney { 372f8ba9c11SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj); 37348fcc3ffSSatoru Takeuchi size_t p_len; 374f8ba9c11SJeff Mahoney 37579aec2b8SAnand Jain if (fs_info->sb->s_flags & MS_RDONLY) 37679aec2b8SAnand Jain return -EROFS; 37779aec2b8SAnand Jain 37848fcc3ffSSatoru Takeuchi /* 37948fcc3ffSSatoru Takeuchi * p_len is the len until the first occurrence of either 38048fcc3ffSSatoru Takeuchi * '\n' or '\0' 38148fcc3ffSSatoru Takeuchi */ 38248fcc3ffSSatoru Takeuchi p_len = strcspn(buf, "\n"); 38348fcc3ffSSatoru Takeuchi 38448fcc3ffSSatoru Takeuchi if (p_len >= BTRFS_LABEL_SIZE) 385f8ba9c11SJeff Mahoney return -EINVAL; 386f8ba9c11SJeff Mahoney 387a6f69dc8SDavid Sterba spin_lock(&fs_info->super_lock); 38848fcc3ffSSatoru Takeuchi memset(fs_info->super_copy->label, 0, BTRFS_LABEL_SIZE); 38948fcc3ffSSatoru Takeuchi memcpy(fs_info->super_copy->label, buf, p_len); 390a6f69dc8SDavid Sterba spin_unlock(&fs_info->super_lock); 391f8ba9c11SJeff Mahoney 392a6f69dc8SDavid Sterba /* 393a6f69dc8SDavid Sterba * We don't want to do full transaction commit from inside sysfs 394a6f69dc8SDavid Sterba */ 395a6f69dc8SDavid Sterba btrfs_set_pending(fs_info, COMMIT); 396a6f69dc8SDavid Sterba wake_up_process(fs_info->transaction_kthread); 397a6f69dc8SDavid Sterba 398f8ba9c11SJeff Mahoney return len; 399f8ba9c11SJeff Mahoney } 40020ee0825SAnand Jain BTRFS_ATTR_RW(label, btrfs_label_show, btrfs_label_store); 401f8ba9c11SJeff Mahoney 402df93589aSDavid Sterba static ssize_t btrfs_nodesize_show(struct kobject *kobj, 403df93589aSDavid Sterba struct kobj_attribute *a, char *buf) 404df93589aSDavid Sterba { 405df93589aSDavid Sterba struct btrfs_fs_info *fs_info = to_fs_info(kobj); 406df93589aSDavid Sterba 407df93589aSDavid Sterba return snprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->nodesize); 408df93589aSDavid Sterba } 409df93589aSDavid Sterba 41098b3d389SAnand Jain BTRFS_ATTR(nodesize, btrfs_nodesize_show); 411df93589aSDavid Sterba 412df93589aSDavid Sterba static ssize_t btrfs_sectorsize_show(struct kobject *kobj, 413df93589aSDavid Sterba struct kobj_attribute *a, char *buf) 414df93589aSDavid Sterba { 415df93589aSDavid Sterba struct btrfs_fs_info *fs_info = to_fs_info(kobj); 416df93589aSDavid Sterba 417df93589aSDavid Sterba return snprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->sectorsize); 418df93589aSDavid Sterba } 419df93589aSDavid Sterba 42098b3d389SAnand Jain BTRFS_ATTR(sectorsize, btrfs_sectorsize_show); 421df93589aSDavid Sterba 422df93589aSDavid Sterba static ssize_t btrfs_clone_alignment_show(struct kobject *kobj, 423df93589aSDavid Sterba struct kobj_attribute *a, char *buf) 424df93589aSDavid Sterba { 425df93589aSDavid Sterba struct btrfs_fs_info *fs_info = to_fs_info(kobj); 426df93589aSDavid Sterba 427df93589aSDavid Sterba return snprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->sectorsize); 428df93589aSDavid Sterba } 429df93589aSDavid Sterba 43098b3d389SAnand Jain BTRFS_ATTR(clone_alignment, btrfs_clone_alignment_show); 431df93589aSDavid Sterba 4320dd2906fSAnand Jain static const struct attribute *btrfs_attrs[] = { 433f8ba9c11SJeff Mahoney BTRFS_ATTR_PTR(label), 434df93589aSDavid Sterba BTRFS_ATTR_PTR(nodesize), 435df93589aSDavid Sterba BTRFS_ATTR_PTR(sectorsize), 436df93589aSDavid Sterba BTRFS_ATTR_PTR(clone_alignment), 437f8ba9c11SJeff Mahoney NULL, 438f8ba9c11SJeff Mahoney }; 439f8ba9c11SJeff Mahoney 440510d7360SJeff Mahoney static void btrfs_release_super_kobj(struct kobject *kobj) 441510d7360SJeff Mahoney { 4422e7910d6SAnand Jain struct btrfs_fs_devices *fs_devs = to_fs_devs(kobj); 443248d200dSAnand Jain 4442e7910d6SAnand Jain memset(&fs_devs->super_kobj, 0, sizeof(struct kobject)); 4452e7910d6SAnand Jain complete(&fs_devs->kobj_unregister); 446510d7360SJeff Mahoney } 447510d7360SJeff Mahoney 448510d7360SJeff Mahoney static struct kobj_type btrfs_ktype = { 449510d7360SJeff Mahoney .sysfs_ops = &kobj_sysfs_ops, 450510d7360SJeff Mahoney .release = btrfs_release_super_kobj, 451510d7360SJeff Mahoney }; 452510d7360SJeff Mahoney 4532e7910d6SAnand Jain static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj) 4542e7910d6SAnand Jain { 4552e7910d6SAnand Jain if (kobj->ktype != &btrfs_ktype) 4562e7910d6SAnand Jain return NULL; 4572e7910d6SAnand Jain return container_of(kobj, struct btrfs_fs_devices, super_kobj); 4582e7910d6SAnand Jain } 4592e7910d6SAnand Jain 460510d7360SJeff Mahoney static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj) 461510d7360SJeff Mahoney { 462510d7360SJeff Mahoney if (kobj->ktype != &btrfs_ktype) 463510d7360SJeff Mahoney return NULL; 4642e7910d6SAnand Jain return to_fs_devs(kobj)->fs_info; 465510d7360SJeff Mahoney } 46658176a96SJosef Bacik 467e453d989SJeff Mahoney #define NUM_FEATURE_BITS 64 468e453d989SJeff Mahoney static char btrfs_unknown_feature_names[3][NUM_FEATURE_BITS][13]; 469e453d989SJeff Mahoney static struct btrfs_feature_attr btrfs_feature_attrs[3][NUM_FEATURE_BITS]; 470e453d989SJeff Mahoney 471e8c9f186SDavid Sterba static const u64 supported_feature_masks[3] = { 472e453d989SJeff Mahoney [FEAT_COMPAT] = BTRFS_FEATURE_COMPAT_SUPP, 473e453d989SJeff Mahoney [FEAT_COMPAT_RO] = BTRFS_FEATURE_COMPAT_RO_SUPP, 474e453d989SJeff Mahoney [FEAT_INCOMPAT] = BTRFS_FEATURE_INCOMPAT_SUPP, 475e453d989SJeff Mahoney }; 476e453d989SJeff Mahoney 477e453d989SJeff Mahoney static int addrm_unknown_feature_attrs(struct btrfs_fs_info *fs_info, bool add) 4785ac1d209SJeff Mahoney { 479e453d989SJeff Mahoney int set; 480e453d989SJeff Mahoney 481e453d989SJeff Mahoney for (set = 0; set < FEAT_MAX; set++) { 482e453d989SJeff Mahoney int i; 483e453d989SJeff Mahoney struct attribute *attrs[2]; 484e453d989SJeff Mahoney struct attribute_group agroup = { 485e453d989SJeff Mahoney .name = "features", 486e453d989SJeff Mahoney .attrs = attrs, 487e453d989SJeff Mahoney }; 488e453d989SJeff Mahoney u64 features = get_features(fs_info, set); 489e453d989SJeff Mahoney features &= ~supported_feature_masks[set]; 490e453d989SJeff Mahoney 491e453d989SJeff Mahoney if (!features) 492e453d989SJeff Mahoney continue; 493e453d989SJeff Mahoney 494e453d989SJeff Mahoney attrs[1] = NULL; 495e453d989SJeff Mahoney for (i = 0; i < NUM_FEATURE_BITS; i++) { 496e453d989SJeff Mahoney struct btrfs_feature_attr *fa; 497e453d989SJeff Mahoney 498e453d989SJeff Mahoney if (!(features & (1ULL << i))) 499e453d989SJeff Mahoney continue; 500e453d989SJeff Mahoney 501e453d989SJeff Mahoney fa = &btrfs_feature_attrs[set][i]; 502e453d989SJeff Mahoney attrs[0] = &fa->kobj_attr.attr; 503e453d989SJeff Mahoney if (add) { 504e453d989SJeff Mahoney int ret; 5052e7910d6SAnand Jain ret = sysfs_merge_group(&fs_info->fs_devices->super_kobj, 506e453d989SJeff Mahoney &agroup); 507e453d989SJeff Mahoney if (ret) 508e453d989SJeff Mahoney return ret; 509e453d989SJeff Mahoney } else 5102e7910d6SAnand Jain sysfs_unmerge_group(&fs_info->fs_devices->super_kobj, 511e453d989SJeff Mahoney &agroup); 512e453d989SJeff Mahoney } 513e453d989SJeff Mahoney 514e453d989SJeff Mahoney } 515e453d989SJeff Mahoney return 0; 516e453d989SJeff Mahoney } 517e453d989SJeff Mahoney 5182e3e1281SAnand Jain static void __btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs) 519e453d989SJeff Mahoney { 5202e7910d6SAnand Jain if (fs_devs->device_dir_kobj) { 5212e7910d6SAnand Jain kobject_del(fs_devs->device_dir_kobj); 5222e7910d6SAnand Jain kobject_put(fs_devs->device_dir_kobj); 5232e7910d6SAnand Jain fs_devs->device_dir_kobj = NULL; 524aaf13305SAnand Jain } 525aaf13305SAnand Jain 526f90fc547SAnand Jain if (fs_devs->super_kobj.state_initialized) { 5272e7910d6SAnand Jain kobject_del(&fs_devs->super_kobj); 5282e7910d6SAnand Jain kobject_put(&fs_devs->super_kobj); 5292e7910d6SAnand Jain wait_for_completion(&fs_devs->kobj_unregister); 5305ac1d209SJeff Mahoney } 531f90fc547SAnand Jain } 5325ac1d209SJeff Mahoney 5332e3e1281SAnand Jain /* when fs_devs is NULL it will remove all fsid kobject */ 5341d1c1be3SAnand Jain void btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs) 5352e3e1281SAnand Jain { 5362e3e1281SAnand Jain struct list_head *fs_uuids = btrfs_get_fs_uuids(); 5372e3e1281SAnand Jain 5382e3e1281SAnand Jain if (fs_devs) { 5392e3e1281SAnand Jain __btrfs_sysfs_remove_fsid(fs_devs); 5402e3e1281SAnand Jain return; 5412e3e1281SAnand Jain } 5422e3e1281SAnand Jain 5432e3e1281SAnand Jain list_for_each_entry(fs_devs, fs_uuids, list) { 5442e3e1281SAnand Jain __btrfs_sysfs_remove_fsid(fs_devs); 5452e3e1281SAnand Jain } 5462e3e1281SAnand Jain } 5472e3e1281SAnand Jain 548e453d989SJeff Mahoney void btrfs_sysfs_remove_one(struct btrfs_fs_info *fs_info) 549e453d989SJeff Mahoney { 5505a13f430SAnand Jain btrfs_reset_fs_info_ptr(fs_info); 5515a13f430SAnand Jain 552e453d989SJeff Mahoney if (fs_info->space_info_kobj) { 553e453d989SJeff Mahoney sysfs_remove_files(fs_info->space_info_kobj, allocation_attrs); 554e453d989SJeff Mahoney kobject_del(fs_info->space_info_kobj); 555e453d989SJeff Mahoney kobject_put(fs_info->space_info_kobj); 556e453d989SJeff Mahoney } 557e453d989SJeff Mahoney addrm_unknown_feature_attrs(fs_info, false); 5582e7910d6SAnand Jain sysfs_remove_group(&fs_info->fs_devices->super_kobj, &btrfs_feature_attr_group); 5592e7910d6SAnand Jain sysfs_remove_files(&fs_info->fs_devices->super_kobj, btrfs_attrs); 5606c14a164SAnand Jain btrfs_kobj_rm_device(fs_info->fs_devices, NULL); 561e453d989SJeff Mahoney } 562e453d989SJeff Mahoney 56379da4fa4SJeff Mahoney const char * const btrfs_feature_set_names[3] = { 56479da4fa4SJeff Mahoney [FEAT_COMPAT] = "compat", 56579da4fa4SJeff Mahoney [FEAT_COMPAT_RO] = "compat_ro", 56679da4fa4SJeff Mahoney [FEAT_INCOMPAT] = "incompat", 56779da4fa4SJeff Mahoney }; 56879da4fa4SJeff Mahoney 5693b02a68aSJeff Mahoney char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags) 5703b02a68aSJeff Mahoney { 5713b02a68aSJeff Mahoney size_t bufsize = 4096; /* safe max, 64 names * 64 bytes */ 5723b02a68aSJeff Mahoney int len = 0; 5733b02a68aSJeff Mahoney int i; 5743b02a68aSJeff Mahoney char *str; 5753b02a68aSJeff Mahoney 5763b02a68aSJeff Mahoney str = kmalloc(bufsize, GFP_KERNEL); 5773b02a68aSJeff Mahoney if (!str) 5783b02a68aSJeff Mahoney return str; 5793b02a68aSJeff Mahoney 5803b02a68aSJeff Mahoney for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { 5813b02a68aSJeff Mahoney const char *name; 5823b02a68aSJeff Mahoney 5833b02a68aSJeff Mahoney if (!(flags & (1ULL << i))) 5843b02a68aSJeff Mahoney continue; 5853b02a68aSJeff Mahoney 5863b02a68aSJeff Mahoney name = btrfs_feature_attrs[set][i].kobj_attr.attr.name; 5873b02a68aSJeff Mahoney len += snprintf(str + len, bufsize - len, "%s%s", 5883b02a68aSJeff Mahoney len ? "," : "", name); 5893b02a68aSJeff Mahoney } 5903b02a68aSJeff Mahoney 5913b02a68aSJeff Mahoney return str; 5923b02a68aSJeff Mahoney } 5933b02a68aSJeff Mahoney 59479da4fa4SJeff Mahoney static void init_feature_attrs(void) 59579da4fa4SJeff Mahoney { 59679da4fa4SJeff Mahoney struct btrfs_feature_attr *fa; 59779da4fa4SJeff Mahoney int set, i; 59879da4fa4SJeff Mahoney 59979da4fa4SJeff Mahoney BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names) != 60079da4fa4SJeff Mahoney ARRAY_SIZE(btrfs_feature_attrs)); 60179da4fa4SJeff Mahoney BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names[0]) != 60279da4fa4SJeff Mahoney ARRAY_SIZE(btrfs_feature_attrs[0])); 60379da4fa4SJeff Mahoney 6043b02a68aSJeff Mahoney memset(btrfs_feature_attrs, 0, sizeof(btrfs_feature_attrs)); 6053b02a68aSJeff Mahoney memset(btrfs_unknown_feature_names, 0, 6063b02a68aSJeff Mahoney sizeof(btrfs_unknown_feature_names)); 6073b02a68aSJeff Mahoney 60879da4fa4SJeff Mahoney for (i = 0; btrfs_supported_feature_attrs[i]; i++) { 60979da4fa4SJeff Mahoney struct btrfs_feature_attr *sfa; 61079da4fa4SJeff Mahoney struct attribute *a = btrfs_supported_feature_attrs[i]; 6113b02a68aSJeff Mahoney int bit; 61279da4fa4SJeff Mahoney sfa = attr_to_btrfs_feature_attr(a); 6133b02a68aSJeff Mahoney bit = ilog2(sfa->feature_bit); 6143b02a68aSJeff Mahoney fa = &btrfs_feature_attrs[sfa->feature_set][bit]; 61579da4fa4SJeff Mahoney 61679da4fa4SJeff Mahoney fa->kobj_attr.attr.name = sfa->kobj_attr.attr.name; 61779da4fa4SJeff Mahoney } 61879da4fa4SJeff Mahoney 61979da4fa4SJeff Mahoney for (set = 0; set < FEAT_MAX; set++) { 62079da4fa4SJeff Mahoney for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { 62179da4fa4SJeff Mahoney char *name = btrfs_unknown_feature_names[set][i]; 62279da4fa4SJeff Mahoney fa = &btrfs_feature_attrs[set][i]; 62379da4fa4SJeff Mahoney 62479da4fa4SJeff Mahoney if (fa->kobj_attr.attr.name) 62579da4fa4SJeff Mahoney continue; 62679da4fa4SJeff Mahoney 62779da4fa4SJeff Mahoney snprintf(name, 13, "%s:%u", 62879da4fa4SJeff Mahoney btrfs_feature_set_names[set], i); 62979da4fa4SJeff Mahoney 63079da4fa4SJeff Mahoney fa->kobj_attr.attr.name = name; 63179da4fa4SJeff Mahoney fa->kobj_attr.attr.mode = S_IRUGO; 63279da4fa4SJeff Mahoney fa->feature_set = set; 63379da4fa4SJeff Mahoney fa->feature_bit = 1ULL << i; 63479da4fa4SJeff Mahoney } 63579da4fa4SJeff Mahoney } 63679da4fa4SJeff Mahoney } 63779da4fa4SJeff Mahoney 638e7e1aa9cSAnand Jain /* when one_device is NULL, it removes all device links */ 639e7e1aa9cSAnand Jain 6406c14a164SAnand Jain int btrfs_kobj_rm_device(struct btrfs_fs_devices *fs_devices, 64199994cdeSAnand Jain struct btrfs_device *one_device) 64299994cdeSAnand Jain { 64399994cdeSAnand Jain struct hd_struct *disk; 64499994cdeSAnand Jain struct kobject *disk_kobj; 64599994cdeSAnand Jain 6466c14a164SAnand Jain if (!fs_devices->device_dir_kobj) 64799994cdeSAnand Jain return -EINVAL; 64899994cdeSAnand Jain 64987fa3bb0SLiu Bo if (one_device && one_device->bdev) { 65099994cdeSAnand Jain disk = one_device->bdev->bd_part; 65199994cdeSAnand Jain disk_kobj = &part_to_dev(disk)->kobj; 65299994cdeSAnand Jain 6536c14a164SAnand Jain sysfs_remove_link(fs_devices->device_dir_kobj, 65499994cdeSAnand Jain disk_kobj->name); 65599994cdeSAnand Jain } 65699994cdeSAnand Jain 657e7e1aa9cSAnand Jain if (one_device) 658e7e1aa9cSAnand Jain return 0; 659e7e1aa9cSAnand Jain 660e7e1aa9cSAnand Jain list_for_each_entry(one_device, 6616c14a164SAnand Jain &fs_devices->devices, dev_list) { 662e7e1aa9cSAnand Jain if (!one_device->bdev) 663e7e1aa9cSAnand Jain continue; 664e7e1aa9cSAnand Jain disk = one_device->bdev->bd_part; 665e7e1aa9cSAnand Jain disk_kobj = &part_to_dev(disk)->kobj; 666e7e1aa9cSAnand Jain 6676c14a164SAnand Jain sysfs_remove_link(fs_devices->device_dir_kobj, 668e7e1aa9cSAnand Jain disk_kobj->name); 669e7e1aa9cSAnand Jain } 670e7e1aa9cSAnand Jain 67199994cdeSAnand Jain return 0; 67299994cdeSAnand Jain } 67399994cdeSAnand Jain 6742e7910d6SAnand Jain int btrfs_sysfs_add_device(struct btrfs_fs_devices *fs_devs) 67500c921c2SAnand Jain { 6762e7910d6SAnand Jain if (!fs_devs->device_dir_kobj) 6772e7910d6SAnand Jain fs_devs->device_dir_kobj = kobject_create_and_add("devices", 6782e7910d6SAnand Jain &fs_devs->super_kobj); 67900c921c2SAnand Jain 6802e7910d6SAnand Jain if (!fs_devs->device_dir_kobj) 68100c921c2SAnand Jain return -ENOMEM; 68200c921c2SAnand Jain 68300c921c2SAnand Jain return 0; 68400c921c2SAnand Jain } 68500c921c2SAnand Jain 6861ba43816SAnand Jain int btrfs_kobj_add_device(struct btrfs_fs_devices *fs_devices, 6870d39376aSAnand Jain struct btrfs_device *one_device) 68829e5be24SJeff Mahoney { 68929e5be24SJeff Mahoney int error = 0; 69029e5be24SJeff Mahoney struct btrfs_device *dev; 69129e5be24SJeff Mahoney 69229e5be24SJeff Mahoney list_for_each_entry(dev, &fs_devices->devices, dev_list) { 693f085381eSAnand Jain struct hd_struct *disk; 694f085381eSAnand Jain struct kobject *disk_kobj; 695f085381eSAnand Jain 696f085381eSAnand Jain if (!dev->bdev) 697f085381eSAnand Jain continue; 698f085381eSAnand Jain 6990d39376aSAnand Jain if (one_device && one_device != dev) 7000d39376aSAnand Jain continue; 7010d39376aSAnand Jain 702f085381eSAnand Jain disk = dev->bdev->bd_part; 703f085381eSAnand Jain disk_kobj = &part_to_dev(disk)->kobj; 70429e5be24SJeff Mahoney 7052e7910d6SAnand Jain error = sysfs_create_link(fs_devices->device_dir_kobj, 70629e5be24SJeff Mahoney disk_kobj, disk_kobj->name); 70729e5be24SJeff Mahoney if (error) 70829e5be24SJeff Mahoney break; 70929e5be24SJeff Mahoney } 71029e5be24SJeff Mahoney 71129e5be24SJeff Mahoney return error; 71229e5be24SJeff Mahoney } 71329e5be24SJeff Mahoney 714510d7360SJeff Mahoney /* /sys/fs/btrfs/ entry */ 715510d7360SJeff Mahoney static struct kset *btrfs_kset; 716510d7360SJeff Mahoney 7171bae3098SDavid Sterba /* /sys/kernel/debug/btrfs */ 7181bae3098SDavid Sterba static struct dentry *btrfs_debugfs_root_dentry; 7191bae3098SDavid Sterba 7201bae3098SDavid Sterba /* Debugging tunables and exported data */ 7211bae3098SDavid Sterba u64 btrfs_debugfs_test; 7221bae3098SDavid Sterba 72372059215SAnand Jain /* 72472059215SAnand Jain * Can be called by the device discovery thread. 72572059215SAnand Jain * And parent can be specified for seed device 72672059215SAnand Jain */ 7270c10e2d4SAnand Jain int btrfs_sysfs_add_fsid(struct btrfs_fs_devices *fs_devs, 72872059215SAnand Jain struct kobject *parent) 7295ac1d209SJeff Mahoney { 7305ac1d209SJeff Mahoney int error; 7315ac1d209SJeff Mahoney 7322e7910d6SAnand Jain init_completion(&fs_devs->kobj_unregister); 7332e7910d6SAnand Jain fs_devs->super_kobj.kset = btrfs_kset; 73424bd69cbSAnand Jain error = kobject_init_and_add(&fs_devs->super_kobj, 73524bd69cbSAnand Jain &btrfs_ktype, parent, "%pU", fs_devs->fsid); 73672059215SAnand Jain return error; 73772059215SAnand Jain } 73872059215SAnand Jain 73972059215SAnand Jain int btrfs_sysfs_add_one(struct btrfs_fs_info *fs_info) 74072059215SAnand Jain { 74172059215SAnand Jain int error; 7422e7910d6SAnand Jain struct btrfs_fs_devices *fs_devs = fs_info->fs_devices; 7432e7910d6SAnand Jain struct kobject *super_kobj = &fs_devs->super_kobj; 74472059215SAnand Jain 7455a13f430SAnand Jain btrfs_set_fs_info_ptr(fs_info); 7465a13f430SAnand Jain 747b7c35e81SAnand Jain error = btrfs_kobj_add_device(fs_devs, NULL); 748e453d989SJeff Mahoney if (error) 749e453d989SJeff Mahoney return error; 750510d7360SJeff Mahoney 7512e7910d6SAnand Jain error = sysfs_create_files(super_kobj, btrfs_attrs); 752e453d989SJeff Mahoney if (error) { 753b7c35e81SAnand Jain btrfs_kobj_rm_device(fs_devs, NULL); 754e453d989SJeff Mahoney return error; 755e453d989SJeff Mahoney } 75679da4fa4SJeff Mahoney 7572e7910d6SAnand Jain error = sysfs_create_group(super_kobj, 7580dd2906fSAnand Jain &btrfs_feature_attr_group); 7590dd2906fSAnand Jain if (error) 7600dd2906fSAnand Jain goto failure; 7610dd2906fSAnand Jain 762e453d989SJeff Mahoney error = addrm_unknown_feature_attrs(fs_info, true); 76379da4fa4SJeff Mahoney if (error) 76479da4fa4SJeff Mahoney goto failure; 76579da4fa4SJeff Mahoney 7666ab0a202SJeff Mahoney fs_info->space_info_kobj = kobject_create_and_add("allocation", 7672e7910d6SAnand Jain super_kobj); 7686ab0a202SJeff Mahoney if (!fs_info->space_info_kobj) { 7696ab0a202SJeff Mahoney error = -ENOMEM; 7706ab0a202SJeff Mahoney goto failure; 7716ab0a202SJeff Mahoney } 7726ab0a202SJeff Mahoney 7736ab0a202SJeff Mahoney error = sysfs_create_files(fs_info->space_info_kobj, allocation_attrs); 7746ab0a202SJeff Mahoney if (error) 7756ab0a202SJeff Mahoney goto failure; 7766ab0a202SJeff Mahoney 77779da4fa4SJeff Mahoney return 0; 77879da4fa4SJeff Mahoney failure: 779510d7360SJeff Mahoney btrfs_sysfs_remove_one(fs_info); 7805ac1d209SJeff Mahoney return error; 7815ac1d209SJeff Mahoney } 7825ac1d209SJeff Mahoney 7831bae3098SDavid Sterba static int btrfs_init_debugfs(void) 7841bae3098SDavid Sterba { 7851bae3098SDavid Sterba #ifdef CONFIG_DEBUG_FS 7861bae3098SDavid Sterba btrfs_debugfs_root_dentry = debugfs_create_dir("btrfs", NULL); 7871bae3098SDavid Sterba if (!btrfs_debugfs_root_dentry) 7881bae3098SDavid Sterba return -ENOMEM; 7891bae3098SDavid Sterba 7901bae3098SDavid Sterba debugfs_create_u64("test", S_IRUGO | S_IWUGO, btrfs_debugfs_root_dentry, 7911bae3098SDavid Sterba &btrfs_debugfs_test); 7921bae3098SDavid Sterba #endif 7931bae3098SDavid Sterba return 0; 7941bae3098SDavid Sterba } 7951bae3098SDavid Sterba 796b214107eSChristoph Hellwig int btrfs_init_sysfs(void) 79758176a96SJosef Bacik { 798079b72bcSJeff Mahoney int ret; 7991bae3098SDavid Sterba 800e3fe4e71SGreg KH btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj); 801e3fe4e71SGreg KH if (!btrfs_kset) 802e3fe4e71SGreg KH return -ENOMEM; 803079b72bcSJeff Mahoney 8041bae3098SDavid Sterba ret = btrfs_init_debugfs(); 8051bae3098SDavid Sterba if (ret) 806001a648dSFilipe Manana goto out1; 807079b72bcSJeff Mahoney 8081bae3098SDavid Sterba init_feature_attrs(); 8091bae3098SDavid Sterba ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); 810001a648dSFilipe Manana if (ret) 811001a648dSFilipe Manana goto out2; 812001a648dSFilipe Manana 813001a648dSFilipe Manana return 0; 814001a648dSFilipe Manana out2: 815001a648dSFilipe Manana debugfs_remove_recursive(btrfs_debugfs_root_dentry); 816001a648dSFilipe Manana out1: 817001a648dSFilipe Manana kset_unregister(btrfs_kset); 8181bae3098SDavid Sterba 8191bae3098SDavid Sterba return ret; 82058176a96SJosef Bacik } 82158176a96SJosef Bacik 822b214107eSChristoph Hellwig void btrfs_exit_sysfs(void) 82358176a96SJosef Bacik { 824079b72bcSJeff Mahoney sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); 825e3fe4e71SGreg KH kset_unregister(btrfs_kset); 8261bae3098SDavid Sterba debugfs_remove_recursive(btrfs_debugfs_root_dentry); 82758176a96SJosef Bacik } 82855d47414SChris Mason 829