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> 2758176a96SJosef Bacik 28bae45de0SChris Mason #include "ctree.h" 29bae45de0SChris Mason #include "disk-io.h" 30bae45de0SChris Mason #include "transaction.h" 31079b72bcSJeff Mahoney #include "sysfs.h" 3229e5be24SJeff Mahoney #include "volumes.h" 33079b72bcSJeff Mahoney 34510d7360SJeff Mahoney static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj); 355ac1d209SJeff Mahoney 36510d7360SJeff Mahoney static u64 get_features(struct btrfs_fs_info *fs_info, 37510d7360SJeff Mahoney enum btrfs_feature_set set) 385ac1d209SJeff Mahoney { 39510d7360SJeff Mahoney struct btrfs_super_block *disk_super = fs_info->super_copy; 40510d7360SJeff Mahoney if (set == FEAT_COMPAT) 41510d7360SJeff Mahoney return btrfs_super_compat_flags(disk_super); 42510d7360SJeff Mahoney else if (set == FEAT_COMPAT_RO) 43510d7360SJeff Mahoney return btrfs_super_compat_ro_flags(disk_super); 44510d7360SJeff Mahoney else 45510d7360SJeff Mahoney return btrfs_super_incompat_flags(disk_super); 465ac1d209SJeff Mahoney } 475ac1d209SJeff Mahoney 48ba631941SJeff Mahoney static void set_features(struct btrfs_fs_info *fs_info, 49ba631941SJeff Mahoney enum btrfs_feature_set set, u64 features) 50ba631941SJeff Mahoney { 51ba631941SJeff Mahoney struct btrfs_super_block *disk_super = fs_info->super_copy; 52ba631941SJeff Mahoney if (set == FEAT_COMPAT) 53ba631941SJeff Mahoney btrfs_set_super_compat_flags(disk_super, features); 54ba631941SJeff Mahoney else if (set == FEAT_COMPAT_RO) 55ba631941SJeff Mahoney btrfs_set_super_compat_ro_flags(disk_super, features); 56ba631941SJeff Mahoney else 57ba631941SJeff Mahoney btrfs_set_super_incompat_flags(disk_super, features); 58ba631941SJeff Mahoney } 59ba631941SJeff Mahoney 60ba631941SJeff Mahoney static int can_modify_feature(struct btrfs_feature_attr *fa) 61ba631941SJeff Mahoney { 62ba631941SJeff Mahoney int val = 0; 63ba631941SJeff Mahoney u64 set, clear; 64ba631941SJeff Mahoney switch (fa->feature_set) { 65ba631941SJeff Mahoney case FEAT_COMPAT: 66ba631941SJeff Mahoney set = BTRFS_FEATURE_COMPAT_SAFE_SET; 67ba631941SJeff Mahoney clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR; 68ba631941SJeff Mahoney break; 69ba631941SJeff Mahoney case FEAT_COMPAT_RO: 70ba631941SJeff Mahoney set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET; 71ba631941SJeff Mahoney clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR; 72ba631941SJeff Mahoney break; 73ba631941SJeff Mahoney case FEAT_INCOMPAT: 74ba631941SJeff Mahoney set = BTRFS_FEATURE_INCOMPAT_SAFE_SET; 75ba631941SJeff Mahoney clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR; 76ba631941SJeff Mahoney break; 77ba631941SJeff Mahoney default: 78cc37bb04SDavid Sterba printk(KERN_WARNING "btrfs: sysfs: unknown feature set %d\n", 79cc37bb04SDavid Sterba fa->feature_set); 80cc37bb04SDavid Sterba return 0; 81ba631941SJeff Mahoney } 82ba631941SJeff Mahoney 83ba631941SJeff Mahoney if (set & fa->feature_bit) 84ba631941SJeff Mahoney val |= 1; 85ba631941SJeff Mahoney if (clear & fa->feature_bit) 86ba631941SJeff Mahoney val |= 2; 87ba631941SJeff Mahoney 88ba631941SJeff Mahoney return val; 89ba631941SJeff Mahoney } 90ba631941SJeff Mahoney 91079b72bcSJeff Mahoney static ssize_t btrfs_feature_attr_show(struct kobject *kobj, 92079b72bcSJeff Mahoney struct kobj_attribute *a, char *buf) 93079b72bcSJeff Mahoney { 94510d7360SJeff Mahoney int val = 0; 95510d7360SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj); 96510d7360SJeff Mahoney struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a); 97ba631941SJeff Mahoney if (fs_info) { 98510d7360SJeff Mahoney u64 features = get_features(fs_info, fa->feature_set); 99510d7360SJeff Mahoney if (features & fa->feature_bit) 100510d7360SJeff Mahoney val = 1; 101ba631941SJeff Mahoney } else 102ba631941SJeff Mahoney val = can_modify_feature(fa); 103510d7360SJeff Mahoney 104510d7360SJeff Mahoney return snprintf(buf, PAGE_SIZE, "%d\n", val); 105510d7360SJeff Mahoney } 106510d7360SJeff Mahoney 107ba631941SJeff Mahoney static ssize_t btrfs_feature_attr_store(struct kobject *kobj, 108ba631941SJeff Mahoney struct kobj_attribute *a, 109ba631941SJeff Mahoney const char *buf, size_t count) 110ba631941SJeff Mahoney { 111ba631941SJeff Mahoney struct btrfs_fs_info *fs_info; 112ba631941SJeff Mahoney struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a); 113ba631941SJeff Mahoney struct btrfs_trans_handle *trans; 114ba631941SJeff Mahoney u64 features, set, clear; 115ba631941SJeff Mahoney unsigned long val; 116ba631941SJeff Mahoney int ret; 117ba631941SJeff Mahoney 118ba631941SJeff Mahoney fs_info = to_fs_info(kobj); 119ba631941SJeff Mahoney if (!fs_info) 120ba631941SJeff Mahoney return -EPERM; 121ba631941SJeff Mahoney 122ba631941SJeff Mahoney ret = kstrtoul(skip_spaces(buf), 0, &val); 123ba631941SJeff Mahoney if (ret) 124ba631941SJeff Mahoney return ret; 125ba631941SJeff Mahoney 126ba631941SJeff Mahoney if (fa->feature_set == FEAT_COMPAT) { 127ba631941SJeff Mahoney set = BTRFS_FEATURE_COMPAT_SAFE_SET; 128ba631941SJeff Mahoney clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR; 129ba631941SJeff Mahoney } else if (fa->feature_set == FEAT_COMPAT_RO) { 130ba631941SJeff Mahoney set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET; 131ba631941SJeff Mahoney clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR; 132ba631941SJeff Mahoney } else { 133ba631941SJeff Mahoney set = BTRFS_FEATURE_INCOMPAT_SAFE_SET; 134ba631941SJeff Mahoney clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR; 135ba631941SJeff Mahoney } 136ba631941SJeff Mahoney 137ba631941SJeff Mahoney features = get_features(fs_info, fa->feature_set); 138ba631941SJeff Mahoney 139ba631941SJeff Mahoney /* Nothing to do */ 140ba631941SJeff Mahoney if ((val && (features & fa->feature_bit)) || 141ba631941SJeff Mahoney (!val && !(features & fa->feature_bit))) 142ba631941SJeff Mahoney return count; 143ba631941SJeff Mahoney 144ba631941SJeff Mahoney if ((val && !(set & fa->feature_bit)) || 145ba631941SJeff Mahoney (!val && !(clear & fa->feature_bit))) { 146ba631941SJeff Mahoney btrfs_info(fs_info, 147ba631941SJeff Mahoney "%sabling feature %s on mounted fs is not supported.", 148ba631941SJeff Mahoney val ? "En" : "Dis", fa->kobj_attr.attr.name); 149ba631941SJeff Mahoney return -EPERM; 150ba631941SJeff Mahoney } 151ba631941SJeff Mahoney 152ba631941SJeff Mahoney btrfs_info(fs_info, "%s %s feature flag", 153ba631941SJeff Mahoney val ? "Setting" : "Clearing", fa->kobj_attr.attr.name); 154ba631941SJeff Mahoney 15543d87fa2SDavid Sterba trans = btrfs_start_transaction(fs_info->fs_root, 0); 156ba631941SJeff Mahoney if (IS_ERR(trans)) 157ba631941SJeff Mahoney return PTR_ERR(trans); 158ba631941SJeff Mahoney 159ba631941SJeff Mahoney spin_lock(&fs_info->super_lock); 160ba631941SJeff Mahoney features = get_features(fs_info, fa->feature_set); 161ba631941SJeff Mahoney if (val) 162ba631941SJeff Mahoney features |= fa->feature_bit; 163ba631941SJeff Mahoney else 164ba631941SJeff Mahoney features &= ~fa->feature_bit; 165ba631941SJeff Mahoney set_features(fs_info, fa->feature_set, features); 166ba631941SJeff Mahoney spin_unlock(&fs_info->super_lock); 167ba631941SJeff Mahoney 168ba631941SJeff Mahoney ret = btrfs_commit_transaction(trans, fs_info->fs_root); 169ba631941SJeff Mahoney if (ret) 170ba631941SJeff Mahoney return ret; 171ba631941SJeff Mahoney 172ba631941SJeff Mahoney return count; 173ba631941SJeff Mahoney } 174ba631941SJeff Mahoney 175510d7360SJeff Mahoney static umode_t btrfs_feature_visible(struct kobject *kobj, 176510d7360SJeff Mahoney struct attribute *attr, int unused) 177510d7360SJeff Mahoney { 178510d7360SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj); 179510d7360SJeff Mahoney umode_t mode = attr->mode; 180510d7360SJeff Mahoney 181510d7360SJeff Mahoney if (fs_info) { 182510d7360SJeff Mahoney struct btrfs_feature_attr *fa; 183510d7360SJeff Mahoney u64 features; 184510d7360SJeff Mahoney 185510d7360SJeff Mahoney fa = attr_to_btrfs_feature_attr(attr); 186510d7360SJeff Mahoney features = get_features(fs_info, fa->feature_set); 187510d7360SJeff Mahoney 188ba631941SJeff Mahoney if (can_modify_feature(fa)) 189ba631941SJeff Mahoney mode |= S_IWUSR; 190ba631941SJeff Mahoney else if (!(features & fa->feature_bit)) 191510d7360SJeff Mahoney mode = 0; 192510d7360SJeff Mahoney } 193510d7360SJeff Mahoney 194510d7360SJeff Mahoney return mode; 195079b72bcSJeff Mahoney } 196079b72bcSJeff Mahoney 197079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(mixed_backref, MIXED_BACKREF); 198079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(default_subvol, DEFAULT_SUBVOL); 199079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(mixed_groups, MIXED_GROUPS); 200079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(compress_lzo, COMPRESS_LZO); 201079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(compress_lzov2, COMPRESS_LZOv2); 202079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(big_metadata, BIG_METADATA); 203079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(extended_iref, EXTENDED_IREF); 204079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(raid56, RAID56); 205079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(skinny_metadata, SKINNY_METADATA); 206079b72bcSJeff Mahoney 207079b72bcSJeff Mahoney static struct attribute *btrfs_supported_feature_attrs[] = { 208079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(mixed_backref), 209079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(default_subvol), 210079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(mixed_groups), 211079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(compress_lzo), 212079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(compress_lzov2), 213079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(big_metadata), 214079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(extended_iref), 215079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(raid56), 216079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(skinny_metadata), 217079b72bcSJeff Mahoney NULL 218079b72bcSJeff Mahoney }; 219079b72bcSJeff Mahoney 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 2266ab0a202SJeff Mahoney static ssize_t btrfs_show_u64(u64 *value_ptr, spinlock_t *lock, char *buf) 2276ab0a202SJeff Mahoney { 2286ab0a202SJeff Mahoney u64 val; 2296ab0a202SJeff Mahoney if (lock) 2306ab0a202SJeff Mahoney spin_lock(lock); 2316ab0a202SJeff Mahoney val = *value_ptr; 2326ab0a202SJeff Mahoney if (lock) 2336ab0a202SJeff Mahoney spin_unlock(lock); 2346ab0a202SJeff Mahoney return snprintf(buf, PAGE_SIZE, "%llu\n", val); 2356ab0a202SJeff Mahoney } 2366ab0a202SJeff Mahoney 2376ab0a202SJeff Mahoney static ssize_t global_rsv_size_show(struct kobject *kobj, 2386ab0a202SJeff Mahoney struct kobj_attribute *ka, char *buf) 2396ab0a202SJeff Mahoney { 2406ab0a202SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); 2416ab0a202SJeff Mahoney struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 2426ab0a202SJeff Mahoney return btrfs_show_u64(&block_rsv->size, &block_rsv->lock, buf); 2436ab0a202SJeff Mahoney } 2446ab0a202SJeff Mahoney BTRFS_ATTR(global_rsv_size, 0444, global_rsv_size_show); 2456ab0a202SJeff Mahoney 2466ab0a202SJeff Mahoney static ssize_t global_rsv_reserved_show(struct kobject *kobj, 2476ab0a202SJeff Mahoney struct kobj_attribute *a, char *buf) 2486ab0a202SJeff Mahoney { 2496ab0a202SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); 2506ab0a202SJeff Mahoney struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 2516ab0a202SJeff Mahoney return btrfs_show_u64(&block_rsv->reserved, &block_rsv->lock, buf); 2526ab0a202SJeff Mahoney } 2536ab0a202SJeff Mahoney BTRFS_ATTR(global_rsv_reserved, 0444, global_rsv_reserved_show); 2546ab0a202SJeff Mahoney 2556ab0a202SJeff Mahoney #define to_space_info(_kobj) container_of(_kobj, struct btrfs_space_info, 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; 2686ab0a202SJeff Mahoney int index = kobj - sinfo->block_group_kobjs; 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 { 2906ab0a202SJeff Mahoney kobject_put(kobj->parent); 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 } \ 3076ab0a202SJeff Mahoney BTRFS_ATTR(field, 0444, 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); 3266ab0a202SJeff Mahoney BTRFS_ATTR(total_bytes_pinned, 0444, 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); 364f8ba9c11SJeff Mahoney return snprintf(buf, PAGE_SIZE, "%s\n", fs_info->super_copy->label); 365f8ba9c11SJeff Mahoney } 366f8ba9c11SJeff Mahoney 367f8ba9c11SJeff Mahoney static ssize_t btrfs_label_store(struct kobject *kobj, 368f8ba9c11SJeff Mahoney struct kobj_attribute *a, 369f8ba9c11SJeff Mahoney const char *buf, size_t len) 370f8ba9c11SJeff Mahoney { 371f8ba9c11SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj); 372f8ba9c11SJeff Mahoney struct btrfs_trans_handle *trans; 373f8ba9c11SJeff Mahoney struct btrfs_root *root = fs_info->fs_root; 374f8ba9c11SJeff Mahoney int ret; 375f8ba9c11SJeff Mahoney 376f8ba9c11SJeff Mahoney if (len >= BTRFS_LABEL_SIZE) { 377f8ba9c11SJeff Mahoney pr_err("btrfs: unable to set label with more than %d bytes\n", 378f8ba9c11SJeff Mahoney BTRFS_LABEL_SIZE - 1); 379f8ba9c11SJeff Mahoney return -EINVAL; 380f8ba9c11SJeff Mahoney } 381f8ba9c11SJeff Mahoney 382f8ba9c11SJeff Mahoney trans = btrfs_start_transaction(root, 0); 383f8ba9c11SJeff Mahoney if (IS_ERR(trans)) 384f8ba9c11SJeff Mahoney return PTR_ERR(trans); 385f8ba9c11SJeff Mahoney 386f8ba9c11SJeff Mahoney spin_lock(&root->fs_info->super_lock); 387f8ba9c11SJeff Mahoney strcpy(fs_info->super_copy->label, buf); 388f8ba9c11SJeff Mahoney spin_unlock(&root->fs_info->super_lock); 389f8ba9c11SJeff Mahoney ret = btrfs_commit_transaction(trans, root); 390f8ba9c11SJeff Mahoney 391f8ba9c11SJeff Mahoney if (!ret) 392f8ba9c11SJeff Mahoney return len; 393f8ba9c11SJeff Mahoney 394f8ba9c11SJeff Mahoney return ret; 395f8ba9c11SJeff Mahoney } 396f8ba9c11SJeff Mahoney BTRFS_ATTR_RW(label, 0644, btrfs_label_show, btrfs_label_store); 397f8ba9c11SJeff Mahoney 398f8ba9c11SJeff Mahoney static struct attribute *btrfs_attrs[] = { 399f8ba9c11SJeff Mahoney BTRFS_ATTR_PTR(label), 400f8ba9c11SJeff Mahoney NULL, 401f8ba9c11SJeff Mahoney }; 402f8ba9c11SJeff Mahoney 403510d7360SJeff Mahoney static void btrfs_release_super_kobj(struct kobject *kobj) 404510d7360SJeff Mahoney { 405510d7360SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj); 406510d7360SJeff Mahoney complete(&fs_info->kobj_unregister); 407510d7360SJeff Mahoney } 408510d7360SJeff Mahoney 409510d7360SJeff Mahoney static struct kobj_type btrfs_ktype = { 410510d7360SJeff Mahoney .sysfs_ops = &kobj_sysfs_ops, 411510d7360SJeff Mahoney .release = btrfs_release_super_kobj, 412f8ba9c11SJeff Mahoney .default_attrs = btrfs_attrs, 413510d7360SJeff Mahoney }; 414510d7360SJeff Mahoney 415510d7360SJeff Mahoney static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj) 416510d7360SJeff Mahoney { 417510d7360SJeff Mahoney if (kobj->ktype != &btrfs_ktype) 418510d7360SJeff Mahoney return NULL; 419510d7360SJeff Mahoney return container_of(kobj, struct btrfs_fs_info, super_kobj); 420510d7360SJeff Mahoney } 42158176a96SJosef Bacik 422e453d989SJeff Mahoney #define NUM_FEATURE_BITS 64 423e453d989SJeff Mahoney static char btrfs_unknown_feature_names[3][NUM_FEATURE_BITS][13]; 424e453d989SJeff Mahoney static struct btrfs_feature_attr btrfs_feature_attrs[3][NUM_FEATURE_BITS]; 425e453d989SJeff Mahoney 426e453d989SJeff Mahoney static u64 supported_feature_masks[3] = { 427e453d989SJeff Mahoney [FEAT_COMPAT] = BTRFS_FEATURE_COMPAT_SUPP, 428e453d989SJeff Mahoney [FEAT_COMPAT_RO] = BTRFS_FEATURE_COMPAT_RO_SUPP, 429e453d989SJeff Mahoney [FEAT_INCOMPAT] = BTRFS_FEATURE_INCOMPAT_SUPP, 430e453d989SJeff Mahoney }; 431e453d989SJeff Mahoney 432e453d989SJeff Mahoney static int addrm_unknown_feature_attrs(struct btrfs_fs_info *fs_info, bool add) 4335ac1d209SJeff Mahoney { 434e453d989SJeff Mahoney int set; 435e453d989SJeff Mahoney 436e453d989SJeff Mahoney for (set = 0; set < FEAT_MAX; set++) { 437e453d989SJeff Mahoney int i; 438e453d989SJeff Mahoney struct attribute *attrs[2]; 439e453d989SJeff Mahoney struct attribute_group agroup = { 440e453d989SJeff Mahoney .name = "features", 441e453d989SJeff Mahoney .attrs = attrs, 442e453d989SJeff Mahoney }; 443e453d989SJeff Mahoney u64 features = get_features(fs_info, set); 444e453d989SJeff Mahoney features &= ~supported_feature_masks[set]; 445e453d989SJeff Mahoney 446e453d989SJeff Mahoney if (!features) 447e453d989SJeff Mahoney continue; 448e453d989SJeff Mahoney 449e453d989SJeff Mahoney attrs[1] = NULL; 450e453d989SJeff Mahoney for (i = 0; i < NUM_FEATURE_BITS; i++) { 451e453d989SJeff Mahoney struct btrfs_feature_attr *fa; 452e453d989SJeff Mahoney 453e453d989SJeff Mahoney if (!(features & (1ULL << i))) 454e453d989SJeff Mahoney continue; 455e453d989SJeff Mahoney 456e453d989SJeff Mahoney fa = &btrfs_feature_attrs[set][i]; 457e453d989SJeff Mahoney attrs[0] = &fa->kobj_attr.attr; 458e453d989SJeff Mahoney if (add) { 459e453d989SJeff Mahoney int ret; 460e453d989SJeff Mahoney ret = sysfs_merge_group(&fs_info->super_kobj, 461e453d989SJeff Mahoney &agroup); 462e453d989SJeff Mahoney if (ret) 463e453d989SJeff Mahoney return ret; 464e453d989SJeff Mahoney } else 465e453d989SJeff Mahoney sysfs_unmerge_group(&fs_info->super_kobj, 466e453d989SJeff Mahoney &agroup); 467e453d989SJeff Mahoney } 468e453d989SJeff Mahoney 469e453d989SJeff Mahoney } 470e453d989SJeff Mahoney return 0; 471e453d989SJeff Mahoney } 472e453d989SJeff Mahoney 473e453d989SJeff Mahoney static void __btrfs_sysfs_remove_one(struct btrfs_fs_info *fs_info) 474e453d989SJeff Mahoney { 4755ac1d209SJeff Mahoney kobject_del(&fs_info->super_kobj); 4765ac1d209SJeff Mahoney kobject_put(&fs_info->super_kobj); 4775ac1d209SJeff Mahoney wait_for_completion(&fs_info->kobj_unregister); 4785ac1d209SJeff Mahoney } 4795ac1d209SJeff Mahoney 480e453d989SJeff Mahoney void btrfs_sysfs_remove_one(struct btrfs_fs_info *fs_info) 481e453d989SJeff Mahoney { 482e453d989SJeff Mahoney if (fs_info->space_info_kobj) { 483e453d989SJeff Mahoney sysfs_remove_files(fs_info->space_info_kobj, allocation_attrs); 484e453d989SJeff Mahoney kobject_del(fs_info->space_info_kobj); 485e453d989SJeff Mahoney kobject_put(fs_info->space_info_kobj); 486e453d989SJeff Mahoney } 487e453d989SJeff Mahoney kobject_del(fs_info->device_dir_kobj); 488e453d989SJeff Mahoney kobject_put(fs_info->device_dir_kobj); 489e453d989SJeff Mahoney addrm_unknown_feature_attrs(fs_info, false); 490e453d989SJeff Mahoney sysfs_remove_group(&fs_info->super_kobj, &btrfs_feature_attr_group); 491e453d989SJeff Mahoney __btrfs_sysfs_remove_one(fs_info); 492e453d989SJeff Mahoney } 493e453d989SJeff Mahoney 49479da4fa4SJeff Mahoney const char * const btrfs_feature_set_names[3] = { 49579da4fa4SJeff Mahoney [FEAT_COMPAT] = "compat", 49679da4fa4SJeff Mahoney [FEAT_COMPAT_RO] = "compat_ro", 49779da4fa4SJeff Mahoney [FEAT_INCOMPAT] = "incompat", 49879da4fa4SJeff Mahoney }; 49979da4fa4SJeff Mahoney 5003b02a68aSJeff Mahoney char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags) 5013b02a68aSJeff Mahoney { 5023b02a68aSJeff Mahoney size_t bufsize = 4096; /* safe max, 64 names * 64 bytes */ 5033b02a68aSJeff Mahoney int len = 0; 5043b02a68aSJeff Mahoney int i; 5053b02a68aSJeff Mahoney char *str; 5063b02a68aSJeff Mahoney 5073b02a68aSJeff Mahoney str = kmalloc(bufsize, GFP_KERNEL); 5083b02a68aSJeff Mahoney if (!str) 5093b02a68aSJeff Mahoney return str; 5103b02a68aSJeff Mahoney 5113b02a68aSJeff Mahoney for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { 5123b02a68aSJeff Mahoney const char *name; 5133b02a68aSJeff Mahoney 5143b02a68aSJeff Mahoney if (!(flags & (1ULL << i))) 5153b02a68aSJeff Mahoney continue; 5163b02a68aSJeff Mahoney 5173b02a68aSJeff Mahoney name = btrfs_feature_attrs[set][i].kobj_attr.attr.name; 5183b02a68aSJeff Mahoney len += snprintf(str + len, bufsize - len, "%s%s", 5193b02a68aSJeff Mahoney len ? "," : "", name); 5203b02a68aSJeff Mahoney } 5213b02a68aSJeff Mahoney 5223b02a68aSJeff Mahoney return str; 5233b02a68aSJeff Mahoney } 5243b02a68aSJeff Mahoney 52579da4fa4SJeff Mahoney static void init_feature_attrs(void) 52679da4fa4SJeff Mahoney { 52779da4fa4SJeff Mahoney struct btrfs_feature_attr *fa; 52879da4fa4SJeff Mahoney int set, i; 52979da4fa4SJeff Mahoney 53079da4fa4SJeff Mahoney BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names) != 53179da4fa4SJeff Mahoney ARRAY_SIZE(btrfs_feature_attrs)); 53279da4fa4SJeff Mahoney BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names[0]) != 53379da4fa4SJeff Mahoney ARRAY_SIZE(btrfs_feature_attrs[0])); 53479da4fa4SJeff Mahoney 5353b02a68aSJeff Mahoney memset(btrfs_feature_attrs, 0, sizeof(btrfs_feature_attrs)); 5363b02a68aSJeff Mahoney memset(btrfs_unknown_feature_names, 0, 5373b02a68aSJeff Mahoney sizeof(btrfs_unknown_feature_names)); 5383b02a68aSJeff Mahoney 53979da4fa4SJeff Mahoney for (i = 0; btrfs_supported_feature_attrs[i]; i++) { 54079da4fa4SJeff Mahoney struct btrfs_feature_attr *sfa; 54179da4fa4SJeff Mahoney struct attribute *a = btrfs_supported_feature_attrs[i]; 5423b02a68aSJeff Mahoney int bit; 54379da4fa4SJeff Mahoney sfa = attr_to_btrfs_feature_attr(a); 5443b02a68aSJeff Mahoney bit = ilog2(sfa->feature_bit); 5453b02a68aSJeff Mahoney fa = &btrfs_feature_attrs[sfa->feature_set][bit]; 54679da4fa4SJeff Mahoney 54779da4fa4SJeff Mahoney fa->kobj_attr.attr.name = sfa->kobj_attr.attr.name; 54879da4fa4SJeff Mahoney } 54979da4fa4SJeff Mahoney 55079da4fa4SJeff Mahoney for (set = 0; set < FEAT_MAX; set++) { 55179da4fa4SJeff Mahoney for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { 55279da4fa4SJeff Mahoney char *name = btrfs_unknown_feature_names[set][i]; 55379da4fa4SJeff Mahoney fa = &btrfs_feature_attrs[set][i]; 55479da4fa4SJeff Mahoney 55579da4fa4SJeff Mahoney if (fa->kobj_attr.attr.name) 55679da4fa4SJeff Mahoney continue; 55779da4fa4SJeff Mahoney 55879da4fa4SJeff Mahoney snprintf(name, 13, "%s:%u", 55979da4fa4SJeff Mahoney btrfs_feature_set_names[set], i); 56079da4fa4SJeff Mahoney 56179da4fa4SJeff Mahoney fa->kobj_attr.attr.name = name; 56279da4fa4SJeff Mahoney fa->kobj_attr.attr.mode = S_IRUGO; 56379da4fa4SJeff Mahoney fa->feature_set = set; 56479da4fa4SJeff Mahoney fa->feature_bit = 1ULL << i; 56579da4fa4SJeff Mahoney } 56679da4fa4SJeff Mahoney } 56779da4fa4SJeff Mahoney } 56879da4fa4SJeff Mahoney 56929e5be24SJeff Mahoney static int add_device_membership(struct btrfs_fs_info *fs_info) 57029e5be24SJeff Mahoney { 57129e5be24SJeff Mahoney int error = 0; 57229e5be24SJeff Mahoney struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; 57329e5be24SJeff Mahoney struct btrfs_device *dev; 57429e5be24SJeff Mahoney 57529e5be24SJeff Mahoney fs_info->device_dir_kobj = kobject_create_and_add("devices", 57629e5be24SJeff Mahoney &fs_info->super_kobj); 57729e5be24SJeff Mahoney if (!fs_info->device_dir_kobj) 57829e5be24SJeff Mahoney return -ENOMEM; 57929e5be24SJeff Mahoney 58029e5be24SJeff Mahoney list_for_each_entry(dev, &fs_devices->devices, dev_list) { 58129e5be24SJeff Mahoney struct hd_struct *disk = dev->bdev->bd_part; 58229e5be24SJeff Mahoney struct kobject *disk_kobj = &part_to_dev(disk)->kobj; 58329e5be24SJeff Mahoney 58429e5be24SJeff Mahoney error = sysfs_create_link(fs_info->device_dir_kobj, 58529e5be24SJeff Mahoney disk_kobj, disk_kobj->name); 58629e5be24SJeff Mahoney if (error) 58729e5be24SJeff Mahoney break; 58829e5be24SJeff Mahoney } 58929e5be24SJeff Mahoney 59029e5be24SJeff Mahoney return error; 59129e5be24SJeff Mahoney } 59229e5be24SJeff Mahoney 593510d7360SJeff Mahoney /* /sys/fs/btrfs/ entry */ 594510d7360SJeff Mahoney static struct kset *btrfs_kset; 595510d7360SJeff Mahoney 5965ac1d209SJeff Mahoney int btrfs_sysfs_add_one(struct btrfs_fs_info *fs_info) 5975ac1d209SJeff Mahoney { 5985ac1d209SJeff Mahoney int error; 5995ac1d209SJeff Mahoney 6005ac1d209SJeff Mahoney init_completion(&fs_info->kobj_unregister); 601510d7360SJeff Mahoney fs_info->super_kobj.kset = btrfs_kset; 6025ac1d209SJeff Mahoney error = kobject_init_and_add(&fs_info->super_kobj, &btrfs_ktype, NULL, 6035ac1d209SJeff Mahoney "%pU", fs_info->fsid); 604e453d989SJeff Mahoney if (error) 605e453d989SJeff Mahoney return error; 606510d7360SJeff Mahoney 607510d7360SJeff Mahoney error = sysfs_create_group(&fs_info->super_kobj, 608510d7360SJeff Mahoney &btrfs_feature_attr_group); 609e453d989SJeff Mahoney if (error) { 610e453d989SJeff Mahoney __btrfs_sysfs_remove_one(fs_info); 611e453d989SJeff Mahoney return error; 612e453d989SJeff Mahoney } 61379da4fa4SJeff Mahoney 614e453d989SJeff Mahoney error = addrm_unknown_feature_attrs(fs_info, true); 61579da4fa4SJeff Mahoney if (error) 61679da4fa4SJeff Mahoney goto failure; 61779da4fa4SJeff Mahoney 61829e5be24SJeff Mahoney error = add_device_membership(fs_info); 61929e5be24SJeff Mahoney if (error) 62029e5be24SJeff Mahoney goto failure; 62129e5be24SJeff Mahoney 6226ab0a202SJeff Mahoney fs_info->space_info_kobj = kobject_create_and_add("allocation", 6236ab0a202SJeff Mahoney &fs_info->super_kobj); 6246ab0a202SJeff Mahoney if (!fs_info->space_info_kobj) { 6256ab0a202SJeff Mahoney error = -ENOMEM; 6266ab0a202SJeff Mahoney goto failure; 6276ab0a202SJeff Mahoney } 6286ab0a202SJeff Mahoney 6296ab0a202SJeff Mahoney error = sysfs_create_files(fs_info->space_info_kobj, allocation_attrs); 6306ab0a202SJeff Mahoney if (error) 6316ab0a202SJeff Mahoney goto failure; 6326ab0a202SJeff Mahoney 63379da4fa4SJeff Mahoney return 0; 63479da4fa4SJeff Mahoney failure: 635510d7360SJeff Mahoney btrfs_sysfs_remove_one(fs_info); 6365ac1d209SJeff Mahoney return error; 6375ac1d209SJeff Mahoney } 6385ac1d209SJeff Mahoney 639b214107eSChristoph Hellwig int btrfs_init_sysfs(void) 64058176a96SJosef Bacik { 641079b72bcSJeff Mahoney int ret; 642e3fe4e71SGreg KH btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj); 643e3fe4e71SGreg KH if (!btrfs_kset) 644e3fe4e71SGreg KH return -ENOMEM; 645079b72bcSJeff Mahoney 64679da4fa4SJeff Mahoney init_feature_attrs(); 64779da4fa4SJeff Mahoney 648079b72bcSJeff Mahoney ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); 649079b72bcSJeff Mahoney if (ret) { 650079b72bcSJeff Mahoney kset_unregister(btrfs_kset); 651079b72bcSJeff Mahoney return ret; 652079b72bcSJeff Mahoney } 653079b72bcSJeff Mahoney 654e3fe4e71SGreg KH return 0; 65558176a96SJosef Bacik } 65658176a96SJosef Bacik 657b214107eSChristoph Hellwig void btrfs_exit_sysfs(void) 65858176a96SJosef Bacik { 659079b72bcSJeff Mahoney sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); 660e3fe4e71SGreg KH kset_unregister(btrfs_kset); 66158176a96SJosef Bacik } 66255d47414SChris Mason 663