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> 732a9991fSDavid Sterba #include <linux/sched/mm.h> 858176a96SJosef Bacik #include <linux/slab.h> 958176a96SJosef Bacik #include <linux/spinlock.h> 1058176a96SJosef Bacik #include <linux/completion.h> 1179da4fa4SJeff Mahoney #include <linux/bug.h> 1241e6d2a8SJohannes Thumshirn #include <crypto/hash.h> 1358176a96SJosef Bacik 14bae45de0SChris Mason #include "ctree.h" 15dfb79ddbSDennis Zhou #include "discard.h" 16bae45de0SChris Mason #include "disk-io.h" 177573df55SOmar Sandoval #include "send.h" 18bae45de0SChris Mason #include "transaction.h" 19079b72bcSJeff Mahoney #include "sysfs.h" 2029e5be24SJeff Mahoney #include "volumes.h" 218719aaaeSJosef Bacik #include "space-info.h" 22aac0023cSJosef Bacik #include "block-group.h" 2349e5fb46SQu Wenruo #include "qgroup.h" 24079b72bcSJeff Mahoney 259188db61SDavid Sterba struct btrfs_feature_attr { 269188db61SDavid Sterba struct kobj_attribute kobj_attr; 279188db61SDavid Sterba enum btrfs_feature_set feature_set; 289188db61SDavid Sterba u64 feature_bit; 299188db61SDavid Sterba }; 309188db61SDavid Sterba 319188db61SDavid Sterba /* For raid type sysfs entries */ 329188db61SDavid Sterba struct raid_kobject { 339188db61SDavid Sterba u64 flags; 349188db61SDavid Sterba struct kobject kobj; 359188db61SDavid Sterba }; 369188db61SDavid Sterba 379188db61SDavid Sterba #define __INIT_KOBJ_ATTR(_name, _mode, _show, _store) \ 389188db61SDavid Sterba { \ 399188db61SDavid Sterba .attr = { .name = __stringify(_name), .mode = _mode }, \ 409188db61SDavid Sterba .show = _show, \ 419188db61SDavid Sterba .store = _store, \ 429188db61SDavid Sterba } 439188db61SDavid Sterba 449188db61SDavid Sterba #define BTRFS_ATTR_RW(_prefix, _name, _show, _store) \ 459188db61SDavid Sterba static struct kobj_attribute btrfs_attr_##_prefix##_##_name = \ 469188db61SDavid Sterba __INIT_KOBJ_ATTR(_name, 0644, _show, _store) 479188db61SDavid Sterba 489188db61SDavid Sterba #define BTRFS_ATTR(_prefix, _name, _show) \ 499188db61SDavid Sterba static struct kobj_attribute btrfs_attr_##_prefix##_##_name = \ 509188db61SDavid Sterba __INIT_KOBJ_ATTR(_name, 0444, _show, NULL) 519188db61SDavid Sterba 529188db61SDavid Sterba #define BTRFS_ATTR_PTR(_prefix, _name) \ 539188db61SDavid Sterba (&btrfs_attr_##_prefix##_##_name.attr) 549188db61SDavid Sterba 559188db61SDavid Sterba #define BTRFS_FEAT_ATTR(_name, _feature_set, _feature_prefix, _feature_bit) \ 569188db61SDavid Sterba static struct btrfs_feature_attr btrfs_attr_features_##_name = { \ 579188db61SDavid Sterba .kobj_attr = __INIT_KOBJ_ATTR(_name, S_IRUGO, \ 589188db61SDavid Sterba btrfs_feature_attr_show, \ 599188db61SDavid Sterba btrfs_feature_attr_store), \ 609188db61SDavid Sterba .feature_set = _feature_set, \ 619188db61SDavid Sterba .feature_bit = _feature_prefix ##_## _feature_bit, \ 629188db61SDavid Sterba } 639188db61SDavid Sterba #define BTRFS_FEAT_ATTR_PTR(_name) \ 649188db61SDavid Sterba (&btrfs_attr_features_##_name.kobj_attr.attr) 659188db61SDavid Sterba 669188db61SDavid Sterba #define BTRFS_FEAT_ATTR_COMPAT(name, feature) \ 679188db61SDavid Sterba BTRFS_FEAT_ATTR(name, FEAT_COMPAT, BTRFS_FEATURE_COMPAT, feature) 689188db61SDavid Sterba #define BTRFS_FEAT_ATTR_COMPAT_RO(name, feature) \ 699188db61SDavid Sterba BTRFS_FEAT_ATTR(name, FEAT_COMPAT_RO, BTRFS_FEATURE_COMPAT_RO, feature) 709188db61SDavid Sterba #define BTRFS_FEAT_ATTR_INCOMPAT(name, feature) \ 719188db61SDavid Sterba BTRFS_FEAT_ATTR(name, FEAT_INCOMPAT, BTRFS_FEATURE_INCOMPAT, feature) 729188db61SDavid Sterba 73510d7360SJeff Mahoney static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj); 742e7910d6SAnand Jain static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj); 755ac1d209SJeff Mahoney 768f52316cSDavid Sterba static struct btrfs_feature_attr *to_btrfs_feature_attr(struct kobj_attribute *a) 778f52316cSDavid Sterba { 788f52316cSDavid Sterba return container_of(a, struct btrfs_feature_attr, kobj_attr); 798f52316cSDavid Sterba } 808f52316cSDavid Sterba 818f52316cSDavid Sterba static struct kobj_attribute *attr_to_btrfs_attr(struct attribute *attr) 828f52316cSDavid Sterba { 838f52316cSDavid Sterba return container_of(attr, struct kobj_attribute, attr); 848f52316cSDavid Sterba } 858f52316cSDavid Sterba 868f52316cSDavid Sterba static struct btrfs_feature_attr *attr_to_btrfs_feature_attr( 878f52316cSDavid Sterba struct attribute *attr) 888f52316cSDavid Sterba { 898f52316cSDavid Sterba return to_btrfs_feature_attr(attr_to_btrfs_attr(attr)); 908f52316cSDavid Sterba } 918f52316cSDavid Sterba 92510d7360SJeff Mahoney static u64 get_features(struct btrfs_fs_info *fs_info, 93510d7360SJeff Mahoney enum btrfs_feature_set set) 945ac1d209SJeff Mahoney { 95510d7360SJeff Mahoney struct btrfs_super_block *disk_super = fs_info->super_copy; 96510d7360SJeff Mahoney if (set == FEAT_COMPAT) 97510d7360SJeff Mahoney return btrfs_super_compat_flags(disk_super); 98510d7360SJeff Mahoney else if (set == FEAT_COMPAT_RO) 99510d7360SJeff Mahoney return btrfs_super_compat_ro_flags(disk_super); 100510d7360SJeff Mahoney else 101510d7360SJeff Mahoney return btrfs_super_incompat_flags(disk_super); 1025ac1d209SJeff Mahoney } 1035ac1d209SJeff Mahoney 104ba631941SJeff Mahoney static void set_features(struct btrfs_fs_info *fs_info, 105ba631941SJeff Mahoney enum btrfs_feature_set set, u64 features) 106ba631941SJeff Mahoney { 107ba631941SJeff Mahoney struct btrfs_super_block *disk_super = fs_info->super_copy; 108ba631941SJeff Mahoney if (set == FEAT_COMPAT) 109ba631941SJeff Mahoney btrfs_set_super_compat_flags(disk_super, features); 110ba631941SJeff Mahoney else if (set == FEAT_COMPAT_RO) 111ba631941SJeff Mahoney btrfs_set_super_compat_ro_flags(disk_super, features); 112ba631941SJeff Mahoney else 113ba631941SJeff Mahoney btrfs_set_super_incompat_flags(disk_super, features); 114ba631941SJeff Mahoney } 115ba631941SJeff Mahoney 116ba631941SJeff Mahoney static int can_modify_feature(struct btrfs_feature_attr *fa) 117ba631941SJeff Mahoney { 118ba631941SJeff Mahoney int val = 0; 119ba631941SJeff Mahoney u64 set, clear; 120ba631941SJeff Mahoney switch (fa->feature_set) { 121ba631941SJeff Mahoney case FEAT_COMPAT: 122ba631941SJeff Mahoney set = BTRFS_FEATURE_COMPAT_SAFE_SET; 123ba631941SJeff Mahoney clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR; 124ba631941SJeff Mahoney break; 125ba631941SJeff Mahoney case FEAT_COMPAT_RO: 126ba631941SJeff Mahoney set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET; 127ba631941SJeff Mahoney clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR; 128ba631941SJeff Mahoney break; 129ba631941SJeff Mahoney case FEAT_INCOMPAT: 130ba631941SJeff Mahoney set = BTRFS_FEATURE_INCOMPAT_SAFE_SET; 131ba631941SJeff Mahoney clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR; 132ba631941SJeff Mahoney break; 133ba631941SJeff Mahoney default: 13462e85577SJeff Mahoney pr_warn("btrfs: sysfs: unknown feature set %d\n", 135cc37bb04SDavid Sterba fa->feature_set); 136cc37bb04SDavid Sterba return 0; 137ba631941SJeff Mahoney } 138ba631941SJeff Mahoney 139ba631941SJeff Mahoney if (set & fa->feature_bit) 140ba631941SJeff Mahoney val |= 1; 141ba631941SJeff Mahoney if (clear & fa->feature_bit) 142ba631941SJeff Mahoney val |= 2; 143ba631941SJeff Mahoney 144ba631941SJeff Mahoney return val; 145ba631941SJeff Mahoney } 146ba631941SJeff Mahoney 147079b72bcSJeff Mahoney static ssize_t btrfs_feature_attr_show(struct kobject *kobj, 148079b72bcSJeff Mahoney struct kobj_attribute *a, char *buf) 149079b72bcSJeff Mahoney { 150510d7360SJeff Mahoney int val = 0; 151510d7360SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj); 152510d7360SJeff Mahoney struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a); 153ba631941SJeff Mahoney if (fs_info) { 154510d7360SJeff Mahoney u64 features = get_features(fs_info, fa->feature_set); 155510d7360SJeff Mahoney if (features & fa->feature_bit) 156510d7360SJeff Mahoney val = 1; 157ba631941SJeff Mahoney } else 158ba631941SJeff Mahoney val = can_modify_feature(fa); 159510d7360SJeff Mahoney 160abdd9febSTakashi Iwai return scnprintf(buf, PAGE_SIZE, "%d\n", val); 161510d7360SJeff Mahoney } 162510d7360SJeff Mahoney 163ba631941SJeff Mahoney static ssize_t btrfs_feature_attr_store(struct kobject *kobj, 164ba631941SJeff Mahoney struct kobj_attribute *a, 165ba631941SJeff Mahoney const char *buf, size_t count) 166ba631941SJeff Mahoney { 167ba631941SJeff Mahoney struct btrfs_fs_info *fs_info; 168ba631941SJeff Mahoney struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a); 169ba631941SJeff Mahoney u64 features, set, clear; 170ba631941SJeff Mahoney unsigned long val; 171ba631941SJeff Mahoney int ret; 172ba631941SJeff Mahoney 173ba631941SJeff Mahoney fs_info = to_fs_info(kobj); 174ba631941SJeff Mahoney if (!fs_info) 175ba631941SJeff Mahoney return -EPERM; 176ba631941SJeff Mahoney 177bc98a42cSDavid Howells if (sb_rdonly(fs_info->sb)) 178ee611138SDavid Sterba return -EROFS; 179ee611138SDavid Sterba 180ba631941SJeff Mahoney ret = kstrtoul(skip_spaces(buf), 0, &val); 181ba631941SJeff Mahoney if (ret) 182ba631941SJeff Mahoney return ret; 183ba631941SJeff Mahoney 184ba631941SJeff Mahoney if (fa->feature_set == FEAT_COMPAT) { 185ba631941SJeff Mahoney set = BTRFS_FEATURE_COMPAT_SAFE_SET; 186ba631941SJeff Mahoney clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR; 187ba631941SJeff Mahoney } else if (fa->feature_set == FEAT_COMPAT_RO) { 188ba631941SJeff Mahoney set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET; 189ba631941SJeff Mahoney clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR; 190ba631941SJeff Mahoney } else { 191ba631941SJeff Mahoney set = BTRFS_FEATURE_INCOMPAT_SAFE_SET; 192ba631941SJeff Mahoney clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR; 193ba631941SJeff Mahoney } 194ba631941SJeff Mahoney 195ba631941SJeff Mahoney features = get_features(fs_info, fa->feature_set); 196ba631941SJeff Mahoney 197ba631941SJeff Mahoney /* Nothing to do */ 198ba631941SJeff Mahoney if ((val && (features & fa->feature_bit)) || 199ba631941SJeff Mahoney (!val && !(features & fa->feature_bit))) 200ba631941SJeff Mahoney return count; 201ba631941SJeff Mahoney 202ba631941SJeff Mahoney if ((val && !(set & fa->feature_bit)) || 203ba631941SJeff Mahoney (!val && !(clear & fa->feature_bit))) { 204ba631941SJeff Mahoney btrfs_info(fs_info, 205ba631941SJeff Mahoney "%sabling feature %s on mounted fs is not supported.", 206ba631941SJeff Mahoney val ? "En" : "Dis", fa->kobj_attr.attr.name); 207ba631941SJeff Mahoney return -EPERM; 208ba631941SJeff Mahoney } 209ba631941SJeff Mahoney 210ba631941SJeff Mahoney btrfs_info(fs_info, "%s %s feature flag", 211ba631941SJeff Mahoney val ? "Setting" : "Clearing", fa->kobj_attr.attr.name); 212ba631941SJeff Mahoney 213ba631941SJeff Mahoney spin_lock(&fs_info->super_lock); 214ba631941SJeff Mahoney features = get_features(fs_info, fa->feature_set); 215ba631941SJeff Mahoney if (val) 216ba631941SJeff Mahoney features |= fa->feature_bit; 217ba631941SJeff Mahoney else 218ba631941SJeff Mahoney features &= ~fa->feature_bit; 219ba631941SJeff Mahoney set_features(fs_info, fa->feature_set, features); 220ba631941SJeff Mahoney spin_unlock(&fs_info->super_lock); 221ba631941SJeff Mahoney 2220eae2747SDavid Sterba /* 2230eae2747SDavid Sterba * We don't want to do full transaction commit from inside sysfs 2240eae2747SDavid Sterba */ 2250eae2747SDavid Sterba btrfs_set_pending(fs_info, COMMIT); 2260eae2747SDavid Sterba wake_up_process(fs_info->transaction_kthread); 227ba631941SJeff Mahoney 228ba631941SJeff Mahoney return count; 229ba631941SJeff Mahoney } 230ba631941SJeff Mahoney 231510d7360SJeff Mahoney static umode_t btrfs_feature_visible(struct kobject *kobj, 232510d7360SJeff Mahoney struct attribute *attr, int unused) 233510d7360SJeff Mahoney { 234510d7360SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj); 235510d7360SJeff Mahoney umode_t mode = attr->mode; 236510d7360SJeff Mahoney 237510d7360SJeff Mahoney if (fs_info) { 238510d7360SJeff Mahoney struct btrfs_feature_attr *fa; 239510d7360SJeff Mahoney u64 features; 240510d7360SJeff Mahoney 241510d7360SJeff Mahoney fa = attr_to_btrfs_feature_attr(attr); 242510d7360SJeff Mahoney features = get_features(fs_info, fa->feature_set); 243510d7360SJeff Mahoney 244ba631941SJeff Mahoney if (can_modify_feature(fa)) 245ba631941SJeff Mahoney mode |= S_IWUSR; 246ba631941SJeff Mahoney else if (!(features & fa->feature_bit)) 247510d7360SJeff Mahoney mode = 0; 248510d7360SJeff Mahoney } 249510d7360SJeff Mahoney 250510d7360SJeff Mahoney return mode; 251079b72bcSJeff Mahoney } 252079b72bcSJeff Mahoney 253079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(mixed_backref, MIXED_BACKREF); 254079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(default_subvol, DEFAULT_SUBVOL); 255079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(mixed_groups, MIXED_GROUPS); 256079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(compress_lzo, COMPRESS_LZO); 2575c1aab1dSNick Terrell BTRFS_FEAT_ATTR_INCOMPAT(compress_zstd, COMPRESS_ZSTD); 258079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(big_metadata, BIG_METADATA); 259079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(extended_iref, EXTENDED_IREF); 260079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(raid56, RAID56); 261079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(skinny_metadata, SKINNY_METADATA); 262c736c095SDavid Sterba BTRFS_FEAT_ATTR_INCOMPAT(no_holes, NO_HOLES); 26356f20f40SNikolay Borisov BTRFS_FEAT_ATTR_INCOMPAT(metadata_uuid, METADATA_UUID); 2643b5bb73bSDavid Sterba BTRFS_FEAT_ATTR_COMPAT_RO(free_space_tree, FREE_SPACE_TREE); 265cfbb825cSDavid Sterba BTRFS_FEAT_ATTR_INCOMPAT(raid1c34, RAID1C34); 2667b3d5a90SNaohiro Aota /* Remove once support for zoned allocation is feature complete */ 2677b3d5a90SNaohiro Aota #ifdef CONFIG_BTRFS_DEBUG 2687b3d5a90SNaohiro Aota BTRFS_FEAT_ATTR_INCOMPAT(zoned, ZONED); 2697b3d5a90SNaohiro Aota #endif 270*14605409SBoris Burkov #ifdef CONFIG_FS_VERITY 271*14605409SBoris Burkov BTRFS_FEAT_ATTR_COMPAT_RO(verity, VERITY); 272*14605409SBoris Burkov #endif 273079b72bcSJeff Mahoney 274079b72bcSJeff Mahoney static struct attribute *btrfs_supported_feature_attrs[] = { 275079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(mixed_backref), 276079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(default_subvol), 277079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(mixed_groups), 278079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(compress_lzo), 2795c1aab1dSNick Terrell BTRFS_FEAT_ATTR_PTR(compress_zstd), 280079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(big_metadata), 281079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(extended_iref), 282079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(raid56), 283079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(skinny_metadata), 284c736c095SDavid Sterba BTRFS_FEAT_ATTR_PTR(no_holes), 28556f20f40SNikolay Borisov BTRFS_FEAT_ATTR_PTR(metadata_uuid), 2863b5bb73bSDavid Sterba BTRFS_FEAT_ATTR_PTR(free_space_tree), 287cfbb825cSDavid Sterba BTRFS_FEAT_ATTR_PTR(raid1c34), 2887b3d5a90SNaohiro Aota #ifdef CONFIG_BTRFS_DEBUG 2897b3d5a90SNaohiro Aota BTRFS_FEAT_ATTR_PTR(zoned), 2907b3d5a90SNaohiro Aota #endif 291*14605409SBoris Burkov #ifdef CONFIG_FS_VERITY 292*14605409SBoris Burkov BTRFS_FEAT_ATTR_PTR(verity), 293*14605409SBoris Burkov #endif 294079b72bcSJeff Mahoney NULL 295079b72bcSJeff Mahoney }; 296079b72bcSJeff Mahoney 297f902bd3aSMisono Tomohiro /* 298f902bd3aSMisono Tomohiro * Features which depend on feature bits and may differ between each fs. 299f902bd3aSMisono Tomohiro * 300f902bd3aSMisono Tomohiro * /sys/fs/btrfs/features lists all available features of this kernel while 301f902bd3aSMisono Tomohiro * /sys/fs/btrfs/UUID/features shows features of the fs which are enabled or 302f902bd3aSMisono Tomohiro * can be changed online. 303f902bd3aSMisono Tomohiro */ 304079b72bcSJeff Mahoney static const struct attribute_group btrfs_feature_attr_group = { 305079b72bcSJeff Mahoney .name = "features", 306510d7360SJeff Mahoney .is_visible = btrfs_feature_visible, 307079b72bcSJeff Mahoney .attrs = btrfs_supported_feature_attrs, 308079b72bcSJeff Mahoney }; 30958176a96SJosef Bacik 310f902bd3aSMisono Tomohiro static ssize_t rmdir_subvol_show(struct kobject *kobj, 311f902bd3aSMisono Tomohiro struct kobj_attribute *ka, char *buf) 312f902bd3aSMisono Tomohiro { 313abdd9febSTakashi Iwai return scnprintf(buf, PAGE_SIZE, "0\n"); 314f902bd3aSMisono Tomohiro } 315f902bd3aSMisono Tomohiro BTRFS_ATTR(static_feature, rmdir_subvol, rmdir_subvol_show); 316f902bd3aSMisono Tomohiro 317f7cea56cSDavid Sterba static ssize_t supported_checksums_show(struct kobject *kobj, 318f7cea56cSDavid Sterba struct kobj_attribute *a, char *buf) 319f7cea56cSDavid Sterba { 320f7cea56cSDavid Sterba ssize_t ret = 0; 321f7cea56cSDavid Sterba int i; 322f7cea56cSDavid Sterba 323f7cea56cSDavid Sterba for (i = 0; i < btrfs_get_num_csums(); i++) { 324f7cea56cSDavid Sterba /* 325f7cea56cSDavid Sterba * This "trick" only works as long as 'enum btrfs_csum_type' has 326f7cea56cSDavid Sterba * no holes in it 327f7cea56cSDavid Sterba */ 328abdd9febSTakashi Iwai ret += scnprintf(buf + ret, PAGE_SIZE - ret, "%s%s", 329f7cea56cSDavid Sterba (i == 0 ? "" : " "), btrfs_super_csum_name(i)); 330f7cea56cSDavid Sterba 331f7cea56cSDavid Sterba } 332f7cea56cSDavid Sterba 333abdd9febSTakashi Iwai ret += scnprintf(buf + ret, PAGE_SIZE - ret, "\n"); 334f7cea56cSDavid Sterba return ret; 335f7cea56cSDavid Sterba } 336f7cea56cSDavid Sterba BTRFS_ATTR(static_feature, supported_checksums, supported_checksums_show); 337f7cea56cSDavid Sterba 3387573df55SOmar Sandoval static ssize_t send_stream_version_show(struct kobject *kobj, 3397573df55SOmar Sandoval struct kobj_attribute *ka, char *buf) 3407573df55SOmar Sandoval { 3417573df55SOmar Sandoval return snprintf(buf, PAGE_SIZE, "%d\n", BTRFS_SEND_STREAM_VERSION); 3427573df55SOmar Sandoval } 3437573df55SOmar Sandoval BTRFS_ATTR(static_feature, send_stream_version, send_stream_version_show); 3447573df55SOmar Sandoval 345ceafe3ccSJosef Bacik static const char *rescue_opts[] = { 346ceafe3ccSJosef Bacik "usebackuproot", 347ceafe3ccSJosef Bacik "nologreplay", 34842437a63SJosef Bacik "ignorebadroots", 349882dbe0cSJosef Bacik "ignoredatacsums", 3509037d3cbSJosef Bacik "all", 351ceafe3ccSJosef Bacik }; 352ceafe3ccSJosef Bacik 353ceafe3ccSJosef Bacik static ssize_t supported_rescue_options_show(struct kobject *kobj, 354ceafe3ccSJosef Bacik struct kobj_attribute *a, 355ceafe3ccSJosef Bacik char *buf) 356ceafe3ccSJosef Bacik { 357ceafe3ccSJosef Bacik ssize_t ret = 0; 358ceafe3ccSJosef Bacik int i; 359ceafe3ccSJosef Bacik 360ceafe3ccSJosef Bacik for (i = 0; i < ARRAY_SIZE(rescue_opts); i++) 361ceafe3ccSJosef Bacik ret += scnprintf(buf + ret, PAGE_SIZE - ret, "%s%s", 362ceafe3ccSJosef Bacik (i ? " " : ""), rescue_opts[i]); 363ceafe3ccSJosef Bacik ret += scnprintf(buf + ret, PAGE_SIZE - ret, "\n"); 364ceafe3ccSJosef Bacik return ret; 365ceafe3ccSJosef Bacik } 366ceafe3ccSJosef Bacik BTRFS_ATTR(static_feature, supported_rescue_options, 367ceafe3ccSJosef Bacik supported_rescue_options_show); 368ceafe3ccSJosef Bacik 369fc57ad8dSQu Wenruo static ssize_t supported_sectorsizes_show(struct kobject *kobj, 370fc57ad8dSQu Wenruo struct kobj_attribute *a, 371fc57ad8dSQu Wenruo char *buf) 372fc57ad8dSQu Wenruo { 373fc57ad8dSQu Wenruo ssize_t ret = 0; 374fc57ad8dSQu Wenruo 37595ea0486SQu Wenruo /* 4K sector size is also supported with 64K page size */ 37695ea0486SQu Wenruo if (PAGE_SIZE == SZ_64K) 37795ea0486SQu Wenruo ret += scnprintf(buf + ret, PAGE_SIZE - ret, "%u ", SZ_4K); 37895ea0486SQu Wenruo 379fc57ad8dSQu Wenruo /* Only sectorsize == PAGE_SIZE is now supported */ 380fc57ad8dSQu Wenruo ret += scnprintf(buf + ret, PAGE_SIZE - ret, "%lu\n", PAGE_SIZE); 381fc57ad8dSQu Wenruo 382fc57ad8dSQu Wenruo return ret; 383fc57ad8dSQu Wenruo } 384fc57ad8dSQu Wenruo BTRFS_ATTR(static_feature, supported_sectorsizes, 385fc57ad8dSQu Wenruo supported_sectorsizes_show); 386fc57ad8dSQu Wenruo 387f902bd3aSMisono Tomohiro static struct attribute *btrfs_supported_static_feature_attrs[] = { 388f902bd3aSMisono Tomohiro BTRFS_ATTR_PTR(static_feature, rmdir_subvol), 389f7cea56cSDavid Sterba BTRFS_ATTR_PTR(static_feature, supported_checksums), 3907573df55SOmar Sandoval BTRFS_ATTR_PTR(static_feature, send_stream_version), 391ceafe3ccSJosef Bacik BTRFS_ATTR_PTR(static_feature, supported_rescue_options), 392fc57ad8dSQu Wenruo BTRFS_ATTR_PTR(static_feature, supported_sectorsizes), 393f902bd3aSMisono Tomohiro NULL 394f902bd3aSMisono Tomohiro }; 395f902bd3aSMisono Tomohiro 396f902bd3aSMisono Tomohiro /* 397f902bd3aSMisono Tomohiro * Features which only depend on kernel version. 398f902bd3aSMisono Tomohiro * 399f902bd3aSMisono Tomohiro * These are listed in /sys/fs/btrfs/features along with 400f902bd3aSMisono Tomohiro * btrfs_feature_attr_group 401f902bd3aSMisono Tomohiro */ 402f902bd3aSMisono Tomohiro static const struct attribute_group btrfs_static_feature_attr_group = { 403f902bd3aSMisono Tomohiro .name = "features", 404f902bd3aSMisono Tomohiro .attrs = btrfs_supported_static_feature_attrs, 405f902bd3aSMisono Tomohiro }; 406f902bd3aSMisono Tomohiro 4076e369febSDavid Sterba #ifdef CONFIG_BTRFS_DEBUG 4086e369febSDavid Sterba 4096e369febSDavid Sterba /* 410e4faab84SDennis Zhou * Discard statistics and tunables 411e4faab84SDennis Zhou */ 412dfb79ddbSDennis Zhou #define discard_to_fs_info(_kobj) to_fs_info((_kobj)->parent->parent) 413dfb79ddbSDennis Zhou 4145dc7c10bSDennis Zhou static ssize_t btrfs_discardable_bytes_show(struct kobject *kobj, 4155dc7c10bSDennis Zhou struct kobj_attribute *a, 4165dc7c10bSDennis Zhou char *buf) 4175dc7c10bSDennis Zhou { 4185dc7c10bSDennis Zhou struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 4195dc7c10bSDennis Zhou 420abdd9febSTakashi Iwai return scnprintf(buf, PAGE_SIZE, "%lld\n", 4215dc7c10bSDennis Zhou atomic64_read(&fs_info->discard_ctl.discardable_bytes)); 4225dc7c10bSDennis Zhou } 4235dc7c10bSDennis Zhou BTRFS_ATTR(discard, discardable_bytes, btrfs_discardable_bytes_show); 4245dc7c10bSDennis Zhou 425dfb79ddbSDennis Zhou static ssize_t btrfs_discardable_extents_show(struct kobject *kobj, 426dfb79ddbSDennis Zhou struct kobj_attribute *a, 427dfb79ddbSDennis Zhou char *buf) 428dfb79ddbSDennis Zhou { 429dfb79ddbSDennis Zhou struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 430dfb79ddbSDennis Zhou 431abdd9febSTakashi Iwai return scnprintf(buf, PAGE_SIZE, "%d\n", 432dfb79ddbSDennis Zhou atomic_read(&fs_info->discard_ctl.discardable_extents)); 433dfb79ddbSDennis Zhou } 434dfb79ddbSDennis Zhou BTRFS_ATTR(discard, discardable_extents, btrfs_discardable_extents_show); 435dfb79ddbSDennis Zhou 4369ddf648fSDennis Zhou static ssize_t btrfs_discard_bitmap_bytes_show(struct kobject *kobj, 4379ddf648fSDennis Zhou struct kobj_attribute *a, 4389ddf648fSDennis Zhou char *buf) 4399ddf648fSDennis Zhou { 4409ddf648fSDennis Zhou struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 4419ddf648fSDennis Zhou 4428c5ec995SDavid Sterba return scnprintf(buf, PAGE_SIZE, "%llu\n", 4439ddf648fSDennis Zhou fs_info->discard_ctl.discard_bitmap_bytes); 4449ddf648fSDennis Zhou } 4459ddf648fSDennis Zhou BTRFS_ATTR(discard, discard_bitmap_bytes, btrfs_discard_bitmap_bytes_show); 4469ddf648fSDennis Zhou 4479ddf648fSDennis Zhou static ssize_t btrfs_discard_bytes_saved_show(struct kobject *kobj, 4489ddf648fSDennis Zhou struct kobj_attribute *a, 4499ddf648fSDennis Zhou char *buf) 4509ddf648fSDennis Zhou { 4519ddf648fSDennis Zhou struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 4529ddf648fSDennis Zhou 453abdd9febSTakashi Iwai return scnprintf(buf, PAGE_SIZE, "%lld\n", 4549ddf648fSDennis Zhou atomic64_read(&fs_info->discard_ctl.discard_bytes_saved)); 4559ddf648fSDennis Zhou } 4569ddf648fSDennis Zhou BTRFS_ATTR(discard, discard_bytes_saved, btrfs_discard_bytes_saved_show); 4579ddf648fSDennis Zhou 4589ddf648fSDennis Zhou static ssize_t btrfs_discard_extent_bytes_show(struct kobject *kobj, 4599ddf648fSDennis Zhou struct kobj_attribute *a, 4609ddf648fSDennis Zhou char *buf) 4619ddf648fSDennis Zhou { 4629ddf648fSDennis Zhou struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 4639ddf648fSDennis Zhou 4648c5ec995SDavid Sterba return scnprintf(buf, PAGE_SIZE, "%llu\n", 4659ddf648fSDennis Zhou fs_info->discard_ctl.discard_extent_bytes); 4669ddf648fSDennis Zhou } 4679ddf648fSDennis Zhou BTRFS_ATTR(discard, discard_extent_bytes, btrfs_discard_extent_bytes_show); 4689ddf648fSDennis Zhou 469a2309300SDennis Zhou static ssize_t btrfs_discard_iops_limit_show(struct kobject *kobj, 470a2309300SDennis Zhou struct kobj_attribute *a, 471a2309300SDennis Zhou char *buf) 472a2309300SDennis Zhou { 473a2309300SDennis Zhou struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 474a2309300SDennis Zhou 475abdd9febSTakashi Iwai return scnprintf(buf, PAGE_SIZE, "%u\n", 476a2309300SDennis Zhou READ_ONCE(fs_info->discard_ctl.iops_limit)); 477a2309300SDennis Zhou } 478a2309300SDennis Zhou 479a2309300SDennis Zhou static ssize_t btrfs_discard_iops_limit_store(struct kobject *kobj, 480a2309300SDennis Zhou struct kobj_attribute *a, 481a2309300SDennis Zhou const char *buf, size_t len) 482a2309300SDennis Zhou { 483a2309300SDennis Zhou struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 484a2309300SDennis Zhou struct btrfs_discard_ctl *discard_ctl = &fs_info->discard_ctl; 485a2309300SDennis Zhou u32 iops_limit; 486a2309300SDennis Zhou int ret; 487a2309300SDennis Zhou 488a2309300SDennis Zhou ret = kstrtou32(buf, 10, &iops_limit); 489a2309300SDennis Zhou if (ret) 490a2309300SDennis Zhou return -EINVAL; 491a2309300SDennis Zhou 492a2309300SDennis Zhou WRITE_ONCE(discard_ctl->iops_limit, iops_limit); 4933e48d8d2SPavel Begunkov btrfs_discard_calc_delay(discard_ctl); 4943e48d8d2SPavel Begunkov btrfs_discard_schedule_work(discard_ctl, true); 495a2309300SDennis Zhou return len; 496a2309300SDennis Zhou } 497a2309300SDennis Zhou BTRFS_ATTR_RW(discard, iops_limit, btrfs_discard_iops_limit_show, 498a2309300SDennis Zhou btrfs_discard_iops_limit_store); 499a2309300SDennis Zhou 500e93591bbSDennis Zhou static ssize_t btrfs_discard_kbps_limit_show(struct kobject *kobj, 501e93591bbSDennis Zhou struct kobj_attribute *a, 502e93591bbSDennis Zhou char *buf) 503e93591bbSDennis Zhou { 504e93591bbSDennis Zhou struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 505e93591bbSDennis Zhou 506abdd9febSTakashi Iwai return scnprintf(buf, PAGE_SIZE, "%u\n", 507e93591bbSDennis Zhou READ_ONCE(fs_info->discard_ctl.kbps_limit)); 508e93591bbSDennis Zhou } 509e93591bbSDennis Zhou 510e93591bbSDennis Zhou static ssize_t btrfs_discard_kbps_limit_store(struct kobject *kobj, 511e93591bbSDennis Zhou struct kobj_attribute *a, 512e93591bbSDennis Zhou const char *buf, size_t len) 513e93591bbSDennis Zhou { 514e93591bbSDennis Zhou struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 515e93591bbSDennis Zhou struct btrfs_discard_ctl *discard_ctl = &fs_info->discard_ctl; 516e93591bbSDennis Zhou u32 kbps_limit; 517e93591bbSDennis Zhou int ret; 518e93591bbSDennis Zhou 519e93591bbSDennis Zhou ret = kstrtou32(buf, 10, &kbps_limit); 520e93591bbSDennis Zhou if (ret) 521e93591bbSDennis Zhou return -EINVAL; 522e93591bbSDennis Zhou 523e93591bbSDennis Zhou WRITE_ONCE(discard_ctl->kbps_limit, kbps_limit); 5243e48d8d2SPavel Begunkov btrfs_discard_schedule_work(discard_ctl, true); 525e93591bbSDennis Zhou return len; 526e93591bbSDennis Zhou } 527e93591bbSDennis Zhou BTRFS_ATTR_RW(discard, kbps_limit, btrfs_discard_kbps_limit_show, 528e93591bbSDennis Zhou btrfs_discard_kbps_limit_store); 529e93591bbSDennis Zhou 53019b2a2c7SDennis Zhou static ssize_t btrfs_discard_max_discard_size_show(struct kobject *kobj, 53119b2a2c7SDennis Zhou struct kobj_attribute *a, 53219b2a2c7SDennis Zhou char *buf) 53319b2a2c7SDennis Zhou { 53419b2a2c7SDennis Zhou struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 53519b2a2c7SDennis Zhou 536abdd9febSTakashi Iwai return scnprintf(buf, PAGE_SIZE, "%llu\n", 53719b2a2c7SDennis Zhou READ_ONCE(fs_info->discard_ctl.max_discard_size)); 53819b2a2c7SDennis Zhou } 53919b2a2c7SDennis Zhou 54019b2a2c7SDennis Zhou static ssize_t btrfs_discard_max_discard_size_store(struct kobject *kobj, 54119b2a2c7SDennis Zhou struct kobj_attribute *a, 54219b2a2c7SDennis Zhou const char *buf, size_t len) 54319b2a2c7SDennis Zhou { 54419b2a2c7SDennis Zhou struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); 54519b2a2c7SDennis Zhou struct btrfs_discard_ctl *discard_ctl = &fs_info->discard_ctl; 54619b2a2c7SDennis Zhou u64 max_discard_size; 54719b2a2c7SDennis Zhou int ret; 54819b2a2c7SDennis Zhou 54919b2a2c7SDennis Zhou ret = kstrtou64(buf, 10, &max_discard_size); 55019b2a2c7SDennis Zhou if (ret) 55119b2a2c7SDennis Zhou return -EINVAL; 55219b2a2c7SDennis Zhou 55319b2a2c7SDennis Zhou WRITE_ONCE(discard_ctl->max_discard_size, max_discard_size); 55419b2a2c7SDennis Zhou 55519b2a2c7SDennis Zhou return len; 55619b2a2c7SDennis Zhou } 55719b2a2c7SDennis Zhou BTRFS_ATTR_RW(discard, max_discard_size, btrfs_discard_max_discard_size_show, 55819b2a2c7SDennis Zhou btrfs_discard_max_discard_size_store); 55919b2a2c7SDennis Zhou 560e4faab84SDennis Zhou static const struct attribute *discard_debug_attrs[] = { 5615dc7c10bSDennis Zhou BTRFS_ATTR_PTR(discard, discardable_bytes), 562dfb79ddbSDennis Zhou BTRFS_ATTR_PTR(discard, discardable_extents), 5639ddf648fSDennis Zhou BTRFS_ATTR_PTR(discard, discard_bitmap_bytes), 5649ddf648fSDennis Zhou BTRFS_ATTR_PTR(discard, discard_bytes_saved), 5659ddf648fSDennis Zhou BTRFS_ATTR_PTR(discard, discard_extent_bytes), 566a2309300SDennis Zhou BTRFS_ATTR_PTR(discard, iops_limit), 567e93591bbSDennis Zhou BTRFS_ATTR_PTR(discard, kbps_limit), 56819b2a2c7SDennis Zhou BTRFS_ATTR_PTR(discard, max_discard_size), 569e4faab84SDennis Zhou NULL, 570e4faab84SDennis Zhou }; 571e4faab84SDennis Zhou 572e4faab84SDennis Zhou /* 5736e369febSDavid Sterba * Runtime debugging exported via sysfs 5746e369febSDavid Sterba * 5756e369febSDavid Sterba * /sys/fs/btrfs/debug - applies to module or all filesystems 5766e369febSDavid Sterba * /sys/fs/btrfs/UUID - applies only to the given filesystem 5776e369febSDavid Sterba */ 57893945cb4SDennis Zhou static const struct attribute *btrfs_debug_mount_attrs[] = { 57993945cb4SDennis Zhou NULL, 58093945cb4SDennis Zhou }; 58193945cb4SDennis Zhou 5826e369febSDavid Sterba static struct attribute *btrfs_debug_feature_attrs[] = { 5836e369febSDavid Sterba NULL 5846e369febSDavid Sterba }; 5856e369febSDavid Sterba 5866e369febSDavid Sterba static const struct attribute_group btrfs_debug_feature_attr_group = { 5876e369febSDavid Sterba .name = "debug", 5886e369febSDavid Sterba .attrs = btrfs_debug_feature_attrs, 5896e369febSDavid Sterba }; 5906e369febSDavid Sterba 5916e369febSDavid Sterba #endif 5926e369febSDavid Sterba 5936ab0a202SJeff Mahoney static ssize_t btrfs_show_u64(u64 *value_ptr, spinlock_t *lock, char *buf) 5946ab0a202SJeff Mahoney { 5956ab0a202SJeff Mahoney u64 val; 5966ab0a202SJeff Mahoney if (lock) 5976ab0a202SJeff Mahoney spin_lock(lock); 5986ab0a202SJeff Mahoney val = *value_ptr; 5996ab0a202SJeff Mahoney if (lock) 6006ab0a202SJeff Mahoney spin_unlock(lock); 601abdd9febSTakashi Iwai return scnprintf(buf, PAGE_SIZE, "%llu\n", val); 6026ab0a202SJeff Mahoney } 6036ab0a202SJeff Mahoney 6046ab0a202SJeff Mahoney static ssize_t global_rsv_size_show(struct kobject *kobj, 6056ab0a202SJeff Mahoney struct kobj_attribute *ka, char *buf) 6066ab0a202SJeff Mahoney { 6076ab0a202SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); 6086ab0a202SJeff Mahoney struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 6096ab0a202SJeff Mahoney return btrfs_show_u64(&block_rsv->size, &block_rsv->lock, buf); 6106ab0a202SJeff Mahoney } 611a969f4ccSHans van Kranenburg BTRFS_ATTR(allocation, global_rsv_size, global_rsv_size_show); 6126ab0a202SJeff Mahoney 6136ab0a202SJeff Mahoney static ssize_t global_rsv_reserved_show(struct kobject *kobj, 6146ab0a202SJeff Mahoney struct kobj_attribute *a, char *buf) 6156ab0a202SJeff Mahoney { 6166ab0a202SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); 6176ab0a202SJeff Mahoney struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 6186ab0a202SJeff Mahoney return btrfs_show_u64(&block_rsv->reserved, &block_rsv->lock, buf); 6196ab0a202SJeff Mahoney } 620a969f4ccSHans van Kranenburg BTRFS_ATTR(allocation, global_rsv_reserved, global_rsv_reserved_show); 6216ab0a202SJeff Mahoney 6226ab0a202SJeff Mahoney #define to_space_info(_kobj) container_of(_kobj, struct btrfs_space_info, kobj) 623c1895442SJeff Mahoney #define to_raid_kobj(_kobj) container_of(_kobj, struct raid_kobject, kobj) 6246ab0a202SJeff Mahoney 6256ab0a202SJeff Mahoney static ssize_t raid_bytes_show(struct kobject *kobj, 6266ab0a202SJeff Mahoney struct kobj_attribute *attr, char *buf); 627a969f4ccSHans van Kranenburg BTRFS_ATTR(raid, total_bytes, raid_bytes_show); 628a969f4ccSHans van Kranenburg BTRFS_ATTR(raid, used_bytes, raid_bytes_show); 6296ab0a202SJeff Mahoney 6306ab0a202SJeff Mahoney static ssize_t raid_bytes_show(struct kobject *kobj, 6316ab0a202SJeff Mahoney struct kobj_attribute *attr, char *buf) 6326ab0a202SJeff Mahoney 6336ab0a202SJeff Mahoney { 6346ab0a202SJeff Mahoney struct btrfs_space_info *sinfo = to_space_info(kobj->parent); 63532da5386SDavid Sterba struct btrfs_block_group *block_group; 63675cb379dSJeff Mahoney int index = btrfs_bg_flags_to_raid_index(to_raid_kobj(kobj)->flags); 6376ab0a202SJeff Mahoney u64 val = 0; 6386ab0a202SJeff Mahoney 6396ab0a202SJeff Mahoney down_read(&sinfo->groups_sem); 6406ab0a202SJeff Mahoney list_for_each_entry(block_group, &sinfo->block_groups[index], list) { 641a969f4ccSHans van Kranenburg if (&attr->attr == BTRFS_ATTR_PTR(raid, total_bytes)) 642b3470b5dSDavid Sterba val += block_group->length; 6436ab0a202SJeff Mahoney else 644bf38be65SDavid Sterba val += block_group->used; 6456ab0a202SJeff Mahoney } 6466ab0a202SJeff Mahoney up_read(&sinfo->groups_sem); 647abdd9febSTakashi Iwai return scnprintf(buf, PAGE_SIZE, "%llu\n", val); 6486ab0a202SJeff Mahoney } 6496ab0a202SJeff Mahoney 6507c7e3014SKimberly Brown static struct attribute *raid_attrs[] = { 651a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(raid, total_bytes), 652a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(raid, used_bytes), 6536ab0a202SJeff Mahoney NULL 6546ab0a202SJeff Mahoney }; 6557c7e3014SKimberly Brown ATTRIBUTE_GROUPS(raid); 6566ab0a202SJeff Mahoney 6576ab0a202SJeff Mahoney static void release_raid_kobj(struct kobject *kobj) 6586ab0a202SJeff Mahoney { 659c1895442SJeff Mahoney kfree(to_raid_kobj(kobj)); 6606ab0a202SJeff Mahoney } 6616ab0a202SJeff Mahoney 662536ea45cSDavid Sterba static struct kobj_type btrfs_raid_ktype = { 6636ab0a202SJeff Mahoney .sysfs_ops = &kobj_sysfs_ops, 6646ab0a202SJeff Mahoney .release = release_raid_kobj, 6657c7e3014SKimberly Brown .default_groups = raid_groups, 6666ab0a202SJeff Mahoney }; 6676ab0a202SJeff Mahoney 6686ab0a202SJeff Mahoney #define SPACE_INFO_ATTR(field) \ 6696ab0a202SJeff Mahoney static ssize_t btrfs_space_info_show_##field(struct kobject *kobj, \ 6706ab0a202SJeff Mahoney struct kobj_attribute *a, \ 6716ab0a202SJeff Mahoney char *buf) \ 6726ab0a202SJeff Mahoney { \ 6736ab0a202SJeff Mahoney struct btrfs_space_info *sinfo = to_space_info(kobj); \ 6746ab0a202SJeff Mahoney return btrfs_show_u64(&sinfo->field, &sinfo->lock, buf); \ 6756ab0a202SJeff Mahoney } \ 676a969f4ccSHans van Kranenburg BTRFS_ATTR(space_info, field, btrfs_space_info_show_##field) 6776ab0a202SJeff Mahoney 6786ab0a202SJeff Mahoney SPACE_INFO_ATTR(flags); 6796ab0a202SJeff Mahoney SPACE_INFO_ATTR(total_bytes); 6806ab0a202SJeff Mahoney SPACE_INFO_ATTR(bytes_used); 6816ab0a202SJeff Mahoney SPACE_INFO_ATTR(bytes_pinned); 6826ab0a202SJeff Mahoney SPACE_INFO_ATTR(bytes_reserved); 6836ab0a202SJeff Mahoney SPACE_INFO_ATTR(bytes_may_use); 684c1fd5c30SWang Xiaoguang SPACE_INFO_ATTR(bytes_readonly); 685169e0da9SNaohiro Aota SPACE_INFO_ATTR(bytes_zone_unusable); 6866ab0a202SJeff Mahoney SPACE_INFO_ATTR(disk_used); 6876ab0a202SJeff Mahoney SPACE_INFO_ATTR(disk_total); 6886ab0a202SJeff Mahoney 6896ab0a202SJeff Mahoney static struct attribute *space_info_attrs[] = { 690a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, flags), 691a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, total_bytes), 692a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, bytes_used), 693a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, bytes_pinned), 694a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, bytes_reserved), 695a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, bytes_may_use), 696a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, bytes_readonly), 697169e0da9SNaohiro Aota BTRFS_ATTR_PTR(space_info, bytes_zone_unusable), 698a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, disk_used), 699a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(space_info, disk_total), 7006ab0a202SJeff Mahoney NULL, 7016ab0a202SJeff Mahoney }; 7027c7e3014SKimberly Brown ATTRIBUTE_GROUPS(space_info); 7036ab0a202SJeff Mahoney 7046ab0a202SJeff Mahoney static void space_info_release(struct kobject *kobj) 7056ab0a202SJeff Mahoney { 7066ab0a202SJeff Mahoney struct btrfs_space_info *sinfo = to_space_info(kobj); 7076ab0a202SJeff Mahoney kfree(sinfo); 7086ab0a202SJeff Mahoney } 7096ab0a202SJeff Mahoney 71027992d01SDavid Sterba static struct kobj_type space_info_ktype = { 7116ab0a202SJeff Mahoney .sysfs_ops = &kobj_sysfs_ops, 7126ab0a202SJeff Mahoney .release = space_info_release, 7137c7e3014SKimberly Brown .default_groups = space_info_groups, 7146ab0a202SJeff Mahoney }; 7156ab0a202SJeff Mahoney 7166ab0a202SJeff Mahoney static const struct attribute *allocation_attrs[] = { 717a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(allocation, global_rsv_reserved), 718a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(allocation, global_rsv_size), 7196ab0a202SJeff Mahoney NULL, 7206ab0a202SJeff Mahoney }; 7216ab0a202SJeff Mahoney 722f8ba9c11SJeff Mahoney static ssize_t btrfs_label_show(struct kobject *kobj, 723f8ba9c11SJeff Mahoney struct kobj_attribute *a, char *buf) 724f8ba9c11SJeff Mahoney { 725f8ba9c11SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj); 72648fcc3ffSSatoru Takeuchi char *label = fs_info->super_copy->label; 727ee17fc80SDavid Sterba ssize_t ret; 728ee17fc80SDavid Sterba 729ee17fc80SDavid Sterba spin_lock(&fs_info->super_lock); 730abdd9febSTakashi Iwai ret = scnprintf(buf, PAGE_SIZE, label[0] ? "%s\n" : "%s", label); 731ee17fc80SDavid Sterba spin_unlock(&fs_info->super_lock); 732ee17fc80SDavid Sterba 733ee17fc80SDavid Sterba return ret; 734f8ba9c11SJeff Mahoney } 735f8ba9c11SJeff Mahoney 736f8ba9c11SJeff Mahoney static ssize_t btrfs_label_store(struct kobject *kobj, 737f8ba9c11SJeff Mahoney struct kobj_attribute *a, 738f8ba9c11SJeff Mahoney const char *buf, size_t len) 739f8ba9c11SJeff Mahoney { 740f8ba9c11SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj); 74148fcc3ffSSatoru Takeuchi size_t p_len; 742f8ba9c11SJeff Mahoney 74366ac9fe7SDavid Sterba if (!fs_info) 74466ac9fe7SDavid Sterba return -EPERM; 74566ac9fe7SDavid Sterba 746bc98a42cSDavid Howells if (sb_rdonly(fs_info->sb)) 74779aec2b8SAnand Jain return -EROFS; 74879aec2b8SAnand Jain 74948fcc3ffSSatoru Takeuchi /* 75048fcc3ffSSatoru Takeuchi * p_len is the len until the first occurrence of either 75148fcc3ffSSatoru Takeuchi * '\n' or '\0' 75248fcc3ffSSatoru Takeuchi */ 75348fcc3ffSSatoru Takeuchi p_len = strcspn(buf, "\n"); 75448fcc3ffSSatoru Takeuchi 75548fcc3ffSSatoru Takeuchi if (p_len >= BTRFS_LABEL_SIZE) 756f8ba9c11SJeff Mahoney return -EINVAL; 757f8ba9c11SJeff Mahoney 758a6f69dc8SDavid Sterba spin_lock(&fs_info->super_lock); 75948fcc3ffSSatoru Takeuchi memset(fs_info->super_copy->label, 0, BTRFS_LABEL_SIZE); 76048fcc3ffSSatoru Takeuchi memcpy(fs_info->super_copy->label, buf, p_len); 761a6f69dc8SDavid Sterba spin_unlock(&fs_info->super_lock); 762f8ba9c11SJeff Mahoney 763a6f69dc8SDavid Sterba /* 764a6f69dc8SDavid Sterba * We don't want to do full transaction commit from inside sysfs 765a6f69dc8SDavid Sterba */ 766a6f69dc8SDavid Sterba btrfs_set_pending(fs_info, COMMIT); 767a6f69dc8SDavid Sterba wake_up_process(fs_info->transaction_kthread); 768a6f69dc8SDavid Sterba 769f8ba9c11SJeff Mahoney return len; 770f8ba9c11SJeff Mahoney } 771a969f4ccSHans van Kranenburg BTRFS_ATTR_RW(, label, btrfs_label_show, btrfs_label_store); 772f8ba9c11SJeff Mahoney 773df93589aSDavid Sterba static ssize_t btrfs_nodesize_show(struct kobject *kobj, 774df93589aSDavid Sterba struct kobj_attribute *a, char *buf) 775df93589aSDavid Sterba { 776df93589aSDavid Sterba struct btrfs_fs_info *fs_info = to_fs_info(kobj); 777df93589aSDavid Sterba 778abdd9febSTakashi Iwai return scnprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->nodesize); 779df93589aSDavid Sterba } 780df93589aSDavid Sterba 781a969f4ccSHans van Kranenburg BTRFS_ATTR(, nodesize, btrfs_nodesize_show); 782df93589aSDavid Sterba 783df93589aSDavid Sterba static ssize_t btrfs_sectorsize_show(struct kobject *kobj, 784df93589aSDavid Sterba struct kobj_attribute *a, char *buf) 785df93589aSDavid Sterba { 786df93589aSDavid Sterba struct btrfs_fs_info *fs_info = to_fs_info(kobj); 787df93589aSDavid Sterba 788abdd9febSTakashi Iwai return scnprintf(buf, PAGE_SIZE, "%u\n", 789093e037cSDavid Sterba fs_info->super_copy->sectorsize); 790df93589aSDavid Sterba } 791df93589aSDavid Sterba 792a969f4ccSHans van Kranenburg BTRFS_ATTR(, sectorsize, btrfs_sectorsize_show); 793df93589aSDavid Sterba 794df93589aSDavid Sterba static ssize_t btrfs_clone_alignment_show(struct kobject *kobj, 795df93589aSDavid Sterba struct kobj_attribute *a, char *buf) 796df93589aSDavid Sterba { 797df93589aSDavid Sterba struct btrfs_fs_info *fs_info = to_fs_info(kobj); 798df93589aSDavid Sterba 799abdd9febSTakashi Iwai return scnprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->sectorsize); 800df93589aSDavid Sterba } 801df93589aSDavid Sterba 802a969f4ccSHans van Kranenburg BTRFS_ATTR(, clone_alignment, btrfs_clone_alignment_show); 803df93589aSDavid Sterba 8042723480aSSargun Dhillon static ssize_t quota_override_show(struct kobject *kobj, 8052723480aSSargun Dhillon struct kobj_attribute *a, char *buf) 8062723480aSSargun Dhillon { 8072723480aSSargun Dhillon struct btrfs_fs_info *fs_info = to_fs_info(kobj); 8082723480aSSargun Dhillon int quota_override; 8092723480aSSargun Dhillon 8102723480aSSargun Dhillon quota_override = test_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags); 811abdd9febSTakashi Iwai return scnprintf(buf, PAGE_SIZE, "%d\n", quota_override); 8122723480aSSargun Dhillon } 8132723480aSSargun Dhillon 8142723480aSSargun Dhillon static ssize_t quota_override_store(struct kobject *kobj, 8152723480aSSargun Dhillon struct kobj_attribute *a, 8162723480aSSargun Dhillon const char *buf, size_t len) 8172723480aSSargun Dhillon { 8182723480aSSargun Dhillon struct btrfs_fs_info *fs_info = to_fs_info(kobj); 8192723480aSSargun Dhillon unsigned long knob; 8202723480aSSargun Dhillon int err; 8212723480aSSargun Dhillon 8222723480aSSargun Dhillon if (!fs_info) 8232723480aSSargun Dhillon return -EPERM; 8242723480aSSargun Dhillon 8252723480aSSargun Dhillon if (!capable(CAP_SYS_RESOURCE)) 8262723480aSSargun Dhillon return -EPERM; 8272723480aSSargun Dhillon 8282723480aSSargun Dhillon err = kstrtoul(buf, 10, &knob); 8292723480aSSargun Dhillon if (err) 8302723480aSSargun Dhillon return err; 8312723480aSSargun Dhillon if (knob > 1) 8322723480aSSargun Dhillon return -EINVAL; 8332723480aSSargun Dhillon 8342723480aSSargun Dhillon if (knob) 8352723480aSSargun Dhillon set_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags); 8362723480aSSargun Dhillon else 8372723480aSSargun Dhillon clear_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags); 8382723480aSSargun Dhillon 8392723480aSSargun Dhillon return len; 8402723480aSSargun Dhillon } 8412723480aSSargun Dhillon 842a969f4ccSHans van Kranenburg BTRFS_ATTR_RW(, quota_override, quota_override_show, quota_override_store); 8432723480aSSargun Dhillon 84456f20f40SNikolay Borisov static ssize_t btrfs_metadata_uuid_show(struct kobject *kobj, 84556f20f40SNikolay Borisov struct kobj_attribute *a, char *buf) 84656f20f40SNikolay Borisov { 84756f20f40SNikolay Borisov struct btrfs_fs_info *fs_info = to_fs_info(kobj); 84856f20f40SNikolay Borisov 849abdd9febSTakashi Iwai return scnprintf(buf, PAGE_SIZE, "%pU\n", 85056f20f40SNikolay Borisov fs_info->fs_devices->metadata_uuid); 85156f20f40SNikolay Borisov } 85256f20f40SNikolay Borisov 85356f20f40SNikolay Borisov BTRFS_ATTR(, metadata_uuid, btrfs_metadata_uuid_show); 85456f20f40SNikolay Borisov 85541e6d2a8SJohannes Thumshirn static ssize_t btrfs_checksum_show(struct kobject *kobj, 85641e6d2a8SJohannes Thumshirn struct kobj_attribute *a, char *buf) 85741e6d2a8SJohannes Thumshirn { 85841e6d2a8SJohannes Thumshirn struct btrfs_fs_info *fs_info = to_fs_info(kobj); 85941e6d2a8SJohannes Thumshirn u16 csum_type = btrfs_super_csum_type(fs_info->super_copy); 86041e6d2a8SJohannes Thumshirn 861abdd9febSTakashi Iwai return scnprintf(buf, PAGE_SIZE, "%s (%s)\n", 86241e6d2a8SJohannes Thumshirn btrfs_super_csum_name(csum_type), 86341e6d2a8SJohannes Thumshirn crypto_shash_driver_name(fs_info->csum_shash)); 86441e6d2a8SJohannes Thumshirn } 86541e6d2a8SJohannes Thumshirn 86641e6d2a8SJohannes Thumshirn BTRFS_ATTR(, checksum, btrfs_checksum_show); 86741e6d2a8SJohannes Thumshirn 86866a2823cSGoldwyn Rodrigues static ssize_t btrfs_exclusive_operation_show(struct kobject *kobj, 86966a2823cSGoldwyn Rodrigues struct kobj_attribute *a, char *buf) 87066a2823cSGoldwyn Rodrigues { 87166a2823cSGoldwyn Rodrigues struct btrfs_fs_info *fs_info = to_fs_info(kobj); 87266a2823cSGoldwyn Rodrigues const char *str; 87366a2823cSGoldwyn Rodrigues 87466a2823cSGoldwyn Rodrigues switch (READ_ONCE(fs_info->exclusive_operation)) { 87566a2823cSGoldwyn Rodrigues case BTRFS_EXCLOP_NONE: 87666a2823cSGoldwyn Rodrigues str = "none\n"; 87766a2823cSGoldwyn Rodrigues break; 87866a2823cSGoldwyn Rodrigues case BTRFS_EXCLOP_BALANCE: 87966a2823cSGoldwyn Rodrigues str = "balance\n"; 88066a2823cSGoldwyn Rodrigues break; 88166a2823cSGoldwyn Rodrigues case BTRFS_EXCLOP_DEV_ADD: 88266a2823cSGoldwyn Rodrigues str = "device add\n"; 88366a2823cSGoldwyn Rodrigues break; 88466a2823cSGoldwyn Rodrigues case BTRFS_EXCLOP_DEV_REMOVE: 88566a2823cSGoldwyn Rodrigues str = "device remove\n"; 88666a2823cSGoldwyn Rodrigues break; 88766a2823cSGoldwyn Rodrigues case BTRFS_EXCLOP_DEV_REPLACE: 88866a2823cSGoldwyn Rodrigues str = "device replace\n"; 88966a2823cSGoldwyn Rodrigues break; 89066a2823cSGoldwyn Rodrigues case BTRFS_EXCLOP_RESIZE: 89166a2823cSGoldwyn Rodrigues str = "resize\n"; 89266a2823cSGoldwyn Rodrigues break; 89366a2823cSGoldwyn Rodrigues case BTRFS_EXCLOP_SWAP_ACTIVATE: 89466a2823cSGoldwyn Rodrigues str = "swap activate\n"; 89566a2823cSGoldwyn Rodrigues break; 89666a2823cSGoldwyn Rodrigues default: 89766a2823cSGoldwyn Rodrigues str = "UNKNOWN\n"; 89866a2823cSGoldwyn Rodrigues break; 89966a2823cSGoldwyn Rodrigues } 90066a2823cSGoldwyn Rodrigues return scnprintf(buf, PAGE_SIZE, "%s", str); 90166a2823cSGoldwyn Rodrigues } 90266a2823cSGoldwyn Rodrigues BTRFS_ATTR(, exclusive_operation, btrfs_exclusive_operation_show); 90366a2823cSGoldwyn Rodrigues 904089c8b05SAnand Jain static ssize_t btrfs_generation_show(struct kobject *kobj, 905089c8b05SAnand Jain struct kobj_attribute *a, char *buf) 906089c8b05SAnand Jain { 907089c8b05SAnand Jain struct btrfs_fs_info *fs_info = to_fs_info(kobj); 908089c8b05SAnand Jain 909089c8b05SAnand Jain return scnprintf(buf, PAGE_SIZE, "%llu\n", fs_info->generation); 910089c8b05SAnand Jain } 911089c8b05SAnand Jain BTRFS_ATTR(, generation, btrfs_generation_show); 912089c8b05SAnand Jain 913aaefed20SAnand Jain /* 914aaefed20SAnand Jain * Look for an exact string @string in @buffer with possible leading or 915aaefed20SAnand Jain * trailing whitespace 916aaefed20SAnand Jain */ 917aaefed20SAnand Jain static bool strmatch(const char *buffer, const char *string) 918aaefed20SAnand Jain { 919aaefed20SAnand Jain const size_t len = strlen(string); 920aaefed20SAnand Jain 921aaefed20SAnand Jain /* Skip leading whitespace */ 922aaefed20SAnand Jain buffer = skip_spaces(buffer); 923aaefed20SAnand Jain 924aaefed20SAnand Jain /* Match entire string, check if the rest is whitespace or empty */ 925aaefed20SAnand Jain if (strncmp(string, buffer, len) == 0 && 926aaefed20SAnand Jain strlen(skip_spaces(buffer + len)) == 0) 927aaefed20SAnand Jain return true; 928aaefed20SAnand Jain 929aaefed20SAnand Jain return false; 930aaefed20SAnand Jain } 931aaefed20SAnand Jain 9323d8cc17aSAnand Jain static const char * const btrfs_read_policy_name[] = { "pid" }; 9333d8cc17aSAnand Jain 9343d8cc17aSAnand Jain static ssize_t btrfs_read_policy_show(struct kobject *kobj, 9353d8cc17aSAnand Jain struct kobj_attribute *a, char *buf) 9363d8cc17aSAnand Jain { 9373d8cc17aSAnand Jain struct btrfs_fs_devices *fs_devices = to_fs_devs(kobj); 9383d8cc17aSAnand Jain ssize_t ret = 0; 9393d8cc17aSAnand Jain int i; 9403d8cc17aSAnand Jain 9413d8cc17aSAnand Jain for (i = 0; i < BTRFS_NR_READ_POLICY; i++) { 9423d8cc17aSAnand Jain if (fs_devices->read_policy == i) 9433d8cc17aSAnand Jain ret += scnprintf(buf + ret, PAGE_SIZE - ret, "%s[%s]", 9443d8cc17aSAnand Jain (ret == 0 ? "" : " "), 9453d8cc17aSAnand Jain btrfs_read_policy_name[i]); 9463d8cc17aSAnand Jain else 9473d8cc17aSAnand Jain ret += scnprintf(buf + ret, PAGE_SIZE - ret, "%s%s", 9483d8cc17aSAnand Jain (ret == 0 ? "" : " "), 9493d8cc17aSAnand Jain btrfs_read_policy_name[i]); 9503d8cc17aSAnand Jain } 9513d8cc17aSAnand Jain 9523d8cc17aSAnand Jain ret += scnprintf(buf + ret, PAGE_SIZE - ret, "\n"); 9533d8cc17aSAnand Jain 9543d8cc17aSAnand Jain return ret; 9553d8cc17aSAnand Jain } 9563d8cc17aSAnand Jain 9573d8cc17aSAnand Jain static ssize_t btrfs_read_policy_store(struct kobject *kobj, 9583d8cc17aSAnand Jain struct kobj_attribute *a, 9593d8cc17aSAnand Jain const char *buf, size_t len) 9603d8cc17aSAnand Jain { 9613d8cc17aSAnand Jain struct btrfs_fs_devices *fs_devices = to_fs_devs(kobj); 9623d8cc17aSAnand Jain int i; 9633d8cc17aSAnand Jain 9643d8cc17aSAnand Jain for (i = 0; i < BTRFS_NR_READ_POLICY; i++) { 9653d8cc17aSAnand Jain if (strmatch(buf, btrfs_read_policy_name[i])) { 9663d8cc17aSAnand Jain if (i != fs_devices->read_policy) { 9673d8cc17aSAnand Jain fs_devices->read_policy = i; 9683d8cc17aSAnand Jain btrfs_info(fs_devices->fs_info, 9693d8cc17aSAnand Jain "read policy set to '%s'", 9703d8cc17aSAnand Jain btrfs_read_policy_name[i]); 9713d8cc17aSAnand Jain } 9723d8cc17aSAnand Jain return len; 9733d8cc17aSAnand Jain } 9743d8cc17aSAnand Jain } 9753d8cc17aSAnand Jain 9763d8cc17aSAnand Jain return -EINVAL; 9773d8cc17aSAnand Jain } 9783d8cc17aSAnand Jain BTRFS_ATTR_RW(, read_policy, btrfs_read_policy_show, btrfs_read_policy_store); 9793d8cc17aSAnand Jain 98018bb8bbfSJohannes Thumshirn static ssize_t btrfs_bg_reclaim_threshold_show(struct kobject *kobj, 98118bb8bbfSJohannes Thumshirn struct kobj_attribute *a, 98218bb8bbfSJohannes Thumshirn char *buf) 98318bb8bbfSJohannes Thumshirn { 98418bb8bbfSJohannes Thumshirn struct btrfs_fs_info *fs_info = to_fs_info(kobj); 98518bb8bbfSJohannes Thumshirn ssize_t ret; 98618bb8bbfSJohannes Thumshirn 98718bb8bbfSJohannes Thumshirn ret = scnprintf(buf, PAGE_SIZE, "%d\n", fs_info->bg_reclaim_threshold); 98818bb8bbfSJohannes Thumshirn 98918bb8bbfSJohannes Thumshirn return ret; 99018bb8bbfSJohannes Thumshirn } 99118bb8bbfSJohannes Thumshirn 99218bb8bbfSJohannes Thumshirn static ssize_t btrfs_bg_reclaim_threshold_store(struct kobject *kobj, 99318bb8bbfSJohannes Thumshirn struct kobj_attribute *a, 99418bb8bbfSJohannes Thumshirn const char *buf, size_t len) 99518bb8bbfSJohannes Thumshirn { 99618bb8bbfSJohannes Thumshirn struct btrfs_fs_info *fs_info = to_fs_info(kobj); 99718bb8bbfSJohannes Thumshirn int thresh; 99818bb8bbfSJohannes Thumshirn int ret; 99918bb8bbfSJohannes Thumshirn 100018bb8bbfSJohannes Thumshirn ret = kstrtoint(buf, 10, &thresh); 100118bb8bbfSJohannes Thumshirn if (ret) 100218bb8bbfSJohannes Thumshirn return ret; 100318bb8bbfSJohannes Thumshirn 100418bb8bbfSJohannes Thumshirn if (thresh <= 50 || thresh > 100) 100518bb8bbfSJohannes Thumshirn return -EINVAL; 100618bb8bbfSJohannes Thumshirn 100718bb8bbfSJohannes Thumshirn fs_info->bg_reclaim_threshold = thresh; 100818bb8bbfSJohannes Thumshirn 100918bb8bbfSJohannes Thumshirn return len; 101018bb8bbfSJohannes Thumshirn } 101118bb8bbfSJohannes Thumshirn BTRFS_ATTR_RW(, bg_reclaim_threshold, btrfs_bg_reclaim_threshold_show, 101218bb8bbfSJohannes Thumshirn btrfs_bg_reclaim_threshold_store); 101318bb8bbfSJohannes Thumshirn 10140dd2906fSAnand Jain static const struct attribute *btrfs_attrs[] = { 1015a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(, label), 1016a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(, nodesize), 1017a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(, sectorsize), 1018a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(, clone_alignment), 1019a969f4ccSHans van Kranenburg BTRFS_ATTR_PTR(, quota_override), 102056f20f40SNikolay Borisov BTRFS_ATTR_PTR(, metadata_uuid), 102141e6d2a8SJohannes Thumshirn BTRFS_ATTR_PTR(, checksum), 102266a2823cSGoldwyn Rodrigues BTRFS_ATTR_PTR(, exclusive_operation), 1023089c8b05SAnand Jain BTRFS_ATTR_PTR(, generation), 10243d8cc17aSAnand Jain BTRFS_ATTR_PTR(, read_policy), 102518bb8bbfSJohannes Thumshirn BTRFS_ATTR_PTR(, bg_reclaim_threshold), 1026f8ba9c11SJeff Mahoney NULL, 1027f8ba9c11SJeff Mahoney }; 1028f8ba9c11SJeff Mahoney 1029c1b7e474SAnand Jain static void btrfs_release_fsid_kobj(struct kobject *kobj) 1030510d7360SJeff Mahoney { 10312e7910d6SAnand Jain struct btrfs_fs_devices *fs_devs = to_fs_devs(kobj); 1032248d200dSAnand Jain 1033c1b7e474SAnand Jain memset(&fs_devs->fsid_kobj, 0, sizeof(struct kobject)); 10342e7910d6SAnand Jain complete(&fs_devs->kobj_unregister); 1035510d7360SJeff Mahoney } 1036510d7360SJeff Mahoney 1037510d7360SJeff Mahoney static struct kobj_type btrfs_ktype = { 1038510d7360SJeff Mahoney .sysfs_ops = &kobj_sysfs_ops, 1039c1b7e474SAnand Jain .release = btrfs_release_fsid_kobj, 1040510d7360SJeff Mahoney }; 1041510d7360SJeff Mahoney 10422e7910d6SAnand Jain static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj) 10432e7910d6SAnand Jain { 10442e7910d6SAnand Jain if (kobj->ktype != &btrfs_ktype) 10452e7910d6SAnand Jain return NULL; 1046c1b7e474SAnand Jain return container_of(kobj, struct btrfs_fs_devices, fsid_kobj); 10472e7910d6SAnand Jain } 10482e7910d6SAnand Jain 1049510d7360SJeff Mahoney static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj) 1050510d7360SJeff Mahoney { 1051510d7360SJeff Mahoney if (kobj->ktype != &btrfs_ktype) 1052510d7360SJeff Mahoney return NULL; 10532e7910d6SAnand Jain return to_fs_devs(kobj)->fs_info; 1054510d7360SJeff Mahoney } 105558176a96SJosef Bacik 1056e453d989SJeff Mahoney #define NUM_FEATURE_BITS 64 10576c52157fSTomohiro Misono #define BTRFS_FEATURE_NAME_MAX 13 10586c52157fSTomohiro Misono static char btrfs_unknown_feature_names[FEAT_MAX][NUM_FEATURE_BITS][BTRFS_FEATURE_NAME_MAX]; 10596c52157fSTomohiro Misono static struct btrfs_feature_attr btrfs_feature_attrs[FEAT_MAX][NUM_FEATURE_BITS]; 1060e453d989SJeff Mahoney 10616c52157fSTomohiro Misono static const u64 supported_feature_masks[FEAT_MAX] = { 1062e453d989SJeff Mahoney [FEAT_COMPAT] = BTRFS_FEATURE_COMPAT_SUPP, 1063e453d989SJeff Mahoney [FEAT_COMPAT_RO] = BTRFS_FEATURE_COMPAT_RO_SUPP, 1064e453d989SJeff Mahoney [FEAT_INCOMPAT] = BTRFS_FEATURE_INCOMPAT_SUPP, 1065e453d989SJeff Mahoney }; 1066e453d989SJeff Mahoney 1067e453d989SJeff Mahoney static int addrm_unknown_feature_attrs(struct btrfs_fs_info *fs_info, bool add) 10685ac1d209SJeff Mahoney { 1069e453d989SJeff Mahoney int set; 1070e453d989SJeff Mahoney 1071e453d989SJeff Mahoney for (set = 0; set < FEAT_MAX; set++) { 1072e453d989SJeff Mahoney int i; 1073e453d989SJeff Mahoney struct attribute *attrs[2]; 1074e453d989SJeff Mahoney struct attribute_group agroup = { 1075e453d989SJeff Mahoney .name = "features", 1076e453d989SJeff Mahoney .attrs = attrs, 1077e453d989SJeff Mahoney }; 1078e453d989SJeff Mahoney u64 features = get_features(fs_info, set); 1079e453d989SJeff Mahoney features &= ~supported_feature_masks[set]; 1080e453d989SJeff Mahoney 1081e453d989SJeff Mahoney if (!features) 1082e453d989SJeff Mahoney continue; 1083e453d989SJeff Mahoney 1084e453d989SJeff Mahoney attrs[1] = NULL; 1085e453d989SJeff Mahoney for (i = 0; i < NUM_FEATURE_BITS; i++) { 1086e453d989SJeff Mahoney struct btrfs_feature_attr *fa; 1087e453d989SJeff Mahoney 1088e453d989SJeff Mahoney if (!(features & (1ULL << i))) 1089e453d989SJeff Mahoney continue; 1090e453d989SJeff Mahoney 1091e453d989SJeff Mahoney fa = &btrfs_feature_attrs[set][i]; 1092e453d989SJeff Mahoney attrs[0] = &fa->kobj_attr.attr; 1093e453d989SJeff Mahoney if (add) { 1094e453d989SJeff Mahoney int ret; 1095c1b7e474SAnand Jain ret = sysfs_merge_group(&fs_info->fs_devices->fsid_kobj, 1096e453d989SJeff Mahoney &agroup); 1097e453d989SJeff Mahoney if (ret) 1098e453d989SJeff Mahoney return ret; 1099e453d989SJeff Mahoney } else 1100c1b7e474SAnand Jain sysfs_unmerge_group(&fs_info->fs_devices->fsid_kobj, 1101e453d989SJeff Mahoney &agroup); 1102e453d989SJeff Mahoney } 1103e453d989SJeff Mahoney 1104e453d989SJeff Mahoney } 1105e453d989SJeff Mahoney return 0; 1106e453d989SJeff Mahoney } 1107e453d989SJeff Mahoney 11082e3e1281SAnand Jain static void __btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs) 1109e453d989SJeff Mahoney { 1110a013d141SAnand Jain if (fs_devs->devinfo_kobj) { 1111a013d141SAnand Jain kobject_del(fs_devs->devinfo_kobj); 1112a013d141SAnand Jain kobject_put(fs_devs->devinfo_kobj); 1113a013d141SAnand Jain fs_devs->devinfo_kobj = NULL; 1114a013d141SAnand Jain } 1115a013d141SAnand Jain 1116b5501504SAnand Jain if (fs_devs->devices_kobj) { 1117b5501504SAnand Jain kobject_del(fs_devs->devices_kobj); 1118b5501504SAnand Jain kobject_put(fs_devs->devices_kobj); 1119b5501504SAnand Jain fs_devs->devices_kobj = NULL; 1120aaf13305SAnand Jain } 1121aaf13305SAnand Jain 1122c1b7e474SAnand Jain if (fs_devs->fsid_kobj.state_initialized) { 1123c1b7e474SAnand Jain kobject_del(&fs_devs->fsid_kobj); 1124c1b7e474SAnand Jain kobject_put(&fs_devs->fsid_kobj); 11252e7910d6SAnand Jain wait_for_completion(&fs_devs->kobj_unregister); 11265ac1d209SJeff Mahoney } 1127f90fc547SAnand Jain } 11285ac1d209SJeff Mahoney 11292e3e1281SAnand Jain /* when fs_devs is NULL it will remove all fsid kobject */ 11301d1c1be3SAnand Jain void btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs) 11312e3e1281SAnand Jain { 11322e3e1281SAnand Jain struct list_head *fs_uuids = btrfs_get_fs_uuids(); 11332e3e1281SAnand Jain 11342e3e1281SAnand Jain if (fs_devs) { 11352e3e1281SAnand Jain __btrfs_sysfs_remove_fsid(fs_devs); 11362e3e1281SAnand Jain return; 11372e3e1281SAnand Jain } 11382e3e1281SAnand Jain 1139c4babc5eSAnand Jain list_for_each_entry(fs_devs, fs_uuids, fs_list) { 11402e3e1281SAnand Jain __btrfs_sysfs_remove_fsid(fs_devs); 11412e3e1281SAnand Jain } 11422e3e1281SAnand Jain } 11432e3e1281SAnand Jain 114453f8a74cSAnand Jain static void btrfs_sysfs_remove_fs_devices(struct btrfs_fs_devices *fs_devices) 114553f8a74cSAnand Jain { 114653f8a74cSAnand Jain struct btrfs_device *device; 114730b0e4e0SAnand Jain struct btrfs_fs_devices *seed; 114853f8a74cSAnand Jain 114953f8a74cSAnand Jain list_for_each_entry(device, &fs_devices->devices, dev_list) 115053f8a74cSAnand Jain btrfs_sysfs_remove_device(device); 115130b0e4e0SAnand Jain 115230b0e4e0SAnand Jain list_for_each_entry(seed, &fs_devices->seed_list, seed_list) { 115330b0e4e0SAnand Jain list_for_each_entry(device, &seed->devices, dev_list) 115430b0e4e0SAnand Jain btrfs_sysfs_remove_device(device); 115530b0e4e0SAnand Jain } 115653f8a74cSAnand Jain } 115753f8a74cSAnand Jain 11586618a59bSAnand Jain void btrfs_sysfs_remove_mounted(struct btrfs_fs_info *fs_info) 1159e453d989SJeff Mahoney { 11603092c68fSNikolay Borisov struct kobject *fsid_kobj = &fs_info->fs_devices->fsid_kobj; 11613092c68fSNikolay Borisov 11623092c68fSNikolay Borisov sysfs_remove_link(fsid_kobj, "bdi"); 11633092c68fSNikolay Borisov 1164e453d989SJeff Mahoney if (fs_info->space_info_kobj) { 1165e453d989SJeff Mahoney sysfs_remove_files(fs_info->space_info_kobj, allocation_attrs); 1166e453d989SJeff Mahoney kobject_del(fs_info->space_info_kobj); 1167e453d989SJeff Mahoney kobject_put(fs_info->space_info_kobj); 1168e453d989SJeff Mahoney } 116971e8978eSDennis Zhou #ifdef CONFIG_BTRFS_DEBUG 1170e4faab84SDennis Zhou if (fs_info->discard_debug_kobj) { 1171e4faab84SDennis Zhou sysfs_remove_files(fs_info->discard_debug_kobj, 1172e4faab84SDennis Zhou discard_debug_attrs); 1173e4faab84SDennis Zhou kobject_del(fs_info->discard_debug_kobj); 1174e4faab84SDennis Zhou kobject_put(fs_info->discard_debug_kobj); 1175e4faab84SDennis Zhou } 117693945cb4SDennis Zhou if (fs_info->debug_kobj) { 117793945cb4SDennis Zhou sysfs_remove_files(fs_info->debug_kobj, btrfs_debug_mount_attrs); 117893945cb4SDennis Zhou kobject_del(fs_info->debug_kobj); 117993945cb4SDennis Zhou kobject_put(fs_info->debug_kobj); 118093945cb4SDennis Zhou } 118171e8978eSDennis Zhou #endif 1182e453d989SJeff Mahoney addrm_unknown_feature_attrs(fs_info, false); 11833092c68fSNikolay Borisov sysfs_remove_group(fsid_kobj, &btrfs_feature_attr_group); 11843092c68fSNikolay Borisov sysfs_remove_files(fsid_kobj, btrfs_attrs); 118553f8a74cSAnand Jain btrfs_sysfs_remove_fs_devices(fs_info->fs_devices); 1186e453d989SJeff Mahoney } 1187e453d989SJeff Mahoney 1188f10152bcSDavid Sterba static const char * const btrfs_feature_set_names[FEAT_MAX] = { 118979da4fa4SJeff Mahoney [FEAT_COMPAT] = "compat", 119079da4fa4SJeff Mahoney [FEAT_COMPAT_RO] = "compat_ro", 119179da4fa4SJeff Mahoney [FEAT_INCOMPAT] = "incompat", 119279da4fa4SJeff Mahoney }; 119379da4fa4SJeff Mahoney 11949e6df7ceSDavid Sterba const char *btrfs_feature_set_name(enum btrfs_feature_set set) 1195f10152bcSDavid Sterba { 1196f10152bcSDavid Sterba return btrfs_feature_set_names[set]; 1197f10152bcSDavid Sterba } 1198f10152bcSDavid Sterba 11993b02a68aSJeff Mahoney char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags) 12003b02a68aSJeff Mahoney { 12013b02a68aSJeff Mahoney size_t bufsize = 4096; /* safe max, 64 names * 64 bytes */ 12023b02a68aSJeff Mahoney int len = 0; 12033b02a68aSJeff Mahoney int i; 12043b02a68aSJeff Mahoney char *str; 12053b02a68aSJeff Mahoney 12063b02a68aSJeff Mahoney str = kmalloc(bufsize, GFP_KERNEL); 12073b02a68aSJeff Mahoney if (!str) 12083b02a68aSJeff Mahoney return str; 12093b02a68aSJeff Mahoney 12103b02a68aSJeff Mahoney for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { 12113b02a68aSJeff Mahoney const char *name; 12123b02a68aSJeff Mahoney 12133b02a68aSJeff Mahoney if (!(flags & (1ULL << i))) 12143b02a68aSJeff Mahoney continue; 12153b02a68aSJeff Mahoney 12163b02a68aSJeff Mahoney name = btrfs_feature_attrs[set][i].kobj_attr.attr.name; 1217abdd9febSTakashi Iwai len += scnprintf(str + len, bufsize - len, "%s%s", 12183b02a68aSJeff Mahoney len ? "," : "", name); 12193b02a68aSJeff Mahoney } 12203b02a68aSJeff Mahoney 12213b02a68aSJeff Mahoney return str; 12223b02a68aSJeff Mahoney } 12233b02a68aSJeff Mahoney 122479da4fa4SJeff Mahoney static void init_feature_attrs(void) 122579da4fa4SJeff Mahoney { 122679da4fa4SJeff Mahoney struct btrfs_feature_attr *fa; 122779da4fa4SJeff Mahoney int set, i; 122879da4fa4SJeff Mahoney 122979da4fa4SJeff Mahoney BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names) != 123079da4fa4SJeff Mahoney ARRAY_SIZE(btrfs_feature_attrs)); 123179da4fa4SJeff Mahoney BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names[0]) != 123279da4fa4SJeff Mahoney ARRAY_SIZE(btrfs_feature_attrs[0])); 123379da4fa4SJeff Mahoney 12343b02a68aSJeff Mahoney memset(btrfs_feature_attrs, 0, sizeof(btrfs_feature_attrs)); 12353b02a68aSJeff Mahoney memset(btrfs_unknown_feature_names, 0, 12363b02a68aSJeff Mahoney sizeof(btrfs_unknown_feature_names)); 12373b02a68aSJeff Mahoney 123879da4fa4SJeff Mahoney for (i = 0; btrfs_supported_feature_attrs[i]; i++) { 123979da4fa4SJeff Mahoney struct btrfs_feature_attr *sfa; 124079da4fa4SJeff Mahoney struct attribute *a = btrfs_supported_feature_attrs[i]; 12413b02a68aSJeff Mahoney int bit; 124279da4fa4SJeff Mahoney sfa = attr_to_btrfs_feature_attr(a); 12433b02a68aSJeff Mahoney bit = ilog2(sfa->feature_bit); 12443b02a68aSJeff Mahoney fa = &btrfs_feature_attrs[sfa->feature_set][bit]; 124579da4fa4SJeff Mahoney 124679da4fa4SJeff Mahoney fa->kobj_attr.attr.name = sfa->kobj_attr.attr.name; 124779da4fa4SJeff Mahoney } 124879da4fa4SJeff Mahoney 124979da4fa4SJeff Mahoney for (set = 0; set < FEAT_MAX; set++) { 125079da4fa4SJeff Mahoney for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { 125179da4fa4SJeff Mahoney char *name = btrfs_unknown_feature_names[set][i]; 125279da4fa4SJeff Mahoney fa = &btrfs_feature_attrs[set][i]; 125379da4fa4SJeff Mahoney 125479da4fa4SJeff Mahoney if (fa->kobj_attr.attr.name) 125579da4fa4SJeff Mahoney continue; 125679da4fa4SJeff Mahoney 12576c52157fSTomohiro Misono snprintf(name, BTRFS_FEATURE_NAME_MAX, "%s:%u", 125879da4fa4SJeff Mahoney btrfs_feature_set_names[set], i); 125979da4fa4SJeff Mahoney 126079da4fa4SJeff Mahoney fa->kobj_attr.attr.name = name; 126179da4fa4SJeff Mahoney fa->kobj_attr.attr.mode = S_IRUGO; 126279da4fa4SJeff Mahoney fa->feature_set = set; 126379da4fa4SJeff Mahoney fa->feature_bit = 1ULL << i; 126479da4fa4SJeff Mahoney } 126579da4fa4SJeff Mahoney } 126679da4fa4SJeff Mahoney } 126779da4fa4SJeff Mahoney 126832a9991fSDavid Sterba /* 126932a9991fSDavid Sterba * Create a sysfs entry for a given block group type at path 127032a9991fSDavid Sterba * /sys/fs/btrfs/UUID/allocation/data/TYPE 127132a9991fSDavid Sterba */ 127232da5386SDavid Sterba void btrfs_sysfs_add_block_group_type(struct btrfs_block_group *cache) 127332a9991fSDavid Sterba { 127432a9991fSDavid Sterba struct btrfs_fs_info *fs_info = cache->fs_info; 127532a9991fSDavid Sterba struct btrfs_space_info *space_info = cache->space_info; 127632a9991fSDavid Sterba struct raid_kobject *rkobj; 127732a9991fSDavid Sterba const int index = btrfs_bg_flags_to_raid_index(cache->flags); 127832a9991fSDavid Sterba unsigned int nofs_flag; 127932a9991fSDavid Sterba int ret; 128032a9991fSDavid Sterba 128132a9991fSDavid Sterba /* 128232a9991fSDavid Sterba * Setup a NOFS context because kobject_add(), deep in its call chain, 128332a9991fSDavid Sterba * does GFP_KERNEL allocations, and we are often called in a context 128432a9991fSDavid Sterba * where if reclaim is triggered we can deadlock (we are either holding 128532a9991fSDavid Sterba * a transaction handle or some lock required for a transaction 128632a9991fSDavid Sterba * commit). 128732a9991fSDavid Sterba */ 128832a9991fSDavid Sterba nofs_flag = memalloc_nofs_save(); 128932a9991fSDavid Sterba 129032a9991fSDavid Sterba rkobj = kzalloc(sizeof(*rkobj), GFP_NOFS); 129132a9991fSDavid Sterba if (!rkobj) { 129232a9991fSDavid Sterba memalloc_nofs_restore(nofs_flag); 129332a9991fSDavid Sterba btrfs_warn(cache->fs_info, 129432a9991fSDavid Sterba "couldn't alloc memory for raid level kobject"); 129532a9991fSDavid Sterba return; 129632a9991fSDavid Sterba } 129732a9991fSDavid Sterba 129832a9991fSDavid Sterba rkobj->flags = cache->flags; 129932a9991fSDavid Sterba kobject_init(&rkobj->kobj, &btrfs_raid_ktype); 130049ea112dSJosef Bacik 130149ea112dSJosef Bacik /* 130249ea112dSJosef Bacik * We call this either on mount, or if we've created a block group for a 130349ea112dSJosef Bacik * new index type while running (i.e. when restriping). The running 130449ea112dSJosef Bacik * case is tricky because we could race with other threads, so we need 130549ea112dSJosef Bacik * to have this check to make sure we didn't already init the kobject. 130649ea112dSJosef Bacik * 130749ea112dSJosef Bacik * We don't have to protect on the free side because it only happens on 130849ea112dSJosef Bacik * unmount. 130949ea112dSJosef Bacik */ 131049ea112dSJosef Bacik spin_lock(&space_info->lock); 131149ea112dSJosef Bacik if (space_info->block_group_kobjs[index]) { 131249ea112dSJosef Bacik spin_unlock(&space_info->lock); 131349ea112dSJosef Bacik kobject_put(&rkobj->kobj); 131449ea112dSJosef Bacik return; 131549ea112dSJosef Bacik } else { 131649ea112dSJosef Bacik space_info->block_group_kobjs[index] = &rkobj->kobj; 131749ea112dSJosef Bacik } 131849ea112dSJosef Bacik spin_unlock(&space_info->lock); 131949ea112dSJosef Bacik 132032a9991fSDavid Sterba ret = kobject_add(&rkobj->kobj, &space_info->kobj, "%s", 132132a9991fSDavid Sterba btrfs_bg_type_to_raid_name(rkobj->flags)); 132232a9991fSDavid Sterba memalloc_nofs_restore(nofs_flag); 132332a9991fSDavid Sterba if (ret) { 132449ea112dSJosef Bacik spin_lock(&space_info->lock); 132549ea112dSJosef Bacik space_info->block_group_kobjs[index] = NULL; 132649ea112dSJosef Bacik spin_unlock(&space_info->lock); 132732a9991fSDavid Sterba kobject_put(&rkobj->kobj); 132832a9991fSDavid Sterba btrfs_warn(fs_info, 132932a9991fSDavid Sterba "failed to add kobject for block cache, ignoring"); 133032a9991fSDavid Sterba return; 133132a9991fSDavid Sterba } 133232a9991fSDavid Sterba } 133332a9991fSDavid Sterba 1334b5865babSDavid Sterba /* 1335b5865babSDavid Sterba * Remove sysfs directories for all block group types of a given space info and 1336b5865babSDavid Sterba * the space info as well 1337b5865babSDavid Sterba */ 1338b5865babSDavid Sterba void btrfs_sysfs_remove_space_info(struct btrfs_space_info *space_info) 1339b5865babSDavid Sterba { 1340b5865babSDavid Sterba int i; 1341b5865babSDavid Sterba 1342b5865babSDavid Sterba for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) { 1343b5865babSDavid Sterba struct kobject *kobj; 1344b5865babSDavid Sterba 1345b5865babSDavid Sterba kobj = space_info->block_group_kobjs[i]; 1346b5865babSDavid Sterba space_info->block_group_kobjs[i] = NULL; 1347b5865babSDavid Sterba if (kobj) { 1348b5865babSDavid Sterba kobject_del(kobj); 1349b5865babSDavid Sterba kobject_put(kobj); 1350b5865babSDavid Sterba } 1351b5865babSDavid Sterba } 1352b5865babSDavid Sterba kobject_del(&space_info->kobj); 1353b5865babSDavid Sterba kobject_put(&space_info->kobj); 1354b5865babSDavid Sterba } 1355b5865babSDavid Sterba 1356b882327aSDavid Sterba static const char *alloc_name(u64 flags) 1357b882327aSDavid Sterba { 1358b882327aSDavid Sterba switch (flags) { 1359b882327aSDavid Sterba case BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_DATA: 1360b882327aSDavid Sterba return "mixed"; 1361b882327aSDavid Sterba case BTRFS_BLOCK_GROUP_METADATA: 1362b882327aSDavid Sterba return "metadata"; 1363b882327aSDavid Sterba case BTRFS_BLOCK_GROUP_DATA: 1364b882327aSDavid Sterba return "data"; 1365b882327aSDavid Sterba case BTRFS_BLOCK_GROUP_SYSTEM: 1366b882327aSDavid Sterba return "system"; 1367b882327aSDavid Sterba default: 1368b882327aSDavid Sterba WARN_ON(1); 1369b882327aSDavid Sterba return "invalid-combination"; 1370445d8ab5STom Rix } 1371b882327aSDavid Sterba } 1372b882327aSDavid Sterba 1373b882327aSDavid Sterba /* 1374b882327aSDavid Sterba * Create a sysfs entry for a space info type at path 1375b882327aSDavid Sterba * /sys/fs/btrfs/UUID/allocation/TYPE 1376b882327aSDavid Sterba */ 1377b882327aSDavid Sterba int btrfs_sysfs_add_space_info_type(struct btrfs_fs_info *fs_info, 1378b882327aSDavid Sterba struct btrfs_space_info *space_info) 1379b882327aSDavid Sterba { 1380b882327aSDavid Sterba int ret; 1381b882327aSDavid Sterba 1382b882327aSDavid Sterba ret = kobject_init_and_add(&space_info->kobj, &space_info_ktype, 1383b882327aSDavid Sterba fs_info->space_info_kobj, "%s", 1384b882327aSDavid Sterba alloc_name(space_info->flags)); 1385b882327aSDavid Sterba if (ret) { 1386b882327aSDavid Sterba kobject_put(&space_info->kobj); 1387b882327aSDavid Sterba return ret; 1388b882327aSDavid Sterba } 1389b882327aSDavid Sterba 1390b882327aSDavid Sterba return 0; 1391b882327aSDavid Sterba } 1392b882327aSDavid Sterba 139353f8a74cSAnand Jain void btrfs_sysfs_remove_device(struct btrfs_device *device) 139499994cdeSAnand Jain { 1395985e233eSAnand Jain struct kobject *devices_kobj; 139699994cdeSAnand Jain 1397985e233eSAnand Jain /* 1398985e233eSAnand Jain * Seed fs_devices devices_kobj aren't used, fetch kobject from the 1399985e233eSAnand Jain * fs_info::fs_devices. 1400985e233eSAnand Jain */ 1401985e233eSAnand Jain devices_kobj = device->fs_info->fs_devices->devices_kobj; 1402985e233eSAnand Jain ASSERT(devices_kobj); 140399994cdeSAnand Jain 14048d65269fSChristoph Hellwig if (device->bdev) 14058d65269fSChristoph Hellwig sysfs_remove_link(devices_kobj, bdev_kobj(device->bdev)->name); 140699994cdeSAnand Jain 1407985e233eSAnand Jain if (device->devid_kobj.state_initialized) { 1408985e233eSAnand Jain kobject_del(&device->devid_kobj); 1409985e233eSAnand Jain kobject_put(&device->devid_kobj); 1410985e233eSAnand Jain wait_for_completion(&device->kobj_unregister); 1411985e233eSAnand Jain } 1412b5ddcffaSAnand Jain } 1413668e48afSAnand Jain 1414668e48afSAnand Jain static ssize_t btrfs_devinfo_in_fs_metadata_show(struct kobject *kobj, 1415668e48afSAnand Jain struct kobj_attribute *a, 1416668e48afSAnand Jain char *buf) 1417668e48afSAnand Jain { 1418668e48afSAnand Jain int val; 1419668e48afSAnand Jain struct btrfs_device *device = container_of(kobj, struct btrfs_device, 1420668e48afSAnand Jain devid_kobj); 1421668e48afSAnand Jain 1422668e48afSAnand Jain val = !!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &device->dev_state); 1423668e48afSAnand Jain 1424abdd9febSTakashi Iwai return scnprintf(buf, PAGE_SIZE, "%d\n", val); 1425668e48afSAnand Jain } 1426668e48afSAnand Jain BTRFS_ATTR(devid, in_fs_metadata, btrfs_devinfo_in_fs_metadata_show); 1427668e48afSAnand Jain 142825864778SAnand Jain static ssize_t btrfs_devinfo_missing_show(struct kobject *kobj, 1429668e48afSAnand Jain struct kobj_attribute *a, char *buf) 1430668e48afSAnand Jain { 1431668e48afSAnand Jain int val; 1432668e48afSAnand Jain struct btrfs_device *device = container_of(kobj, struct btrfs_device, 1433668e48afSAnand Jain devid_kobj); 1434668e48afSAnand Jain 1435668e48afSAnand Jain val = !!test_bit(BTRFS_DEV_STATE_MISSING, &device->dev_state); 1436668e48afSAnand Jain 1437abdd9febSTakashi Iwai return scnprintf(buf, PAGE_SIZE, "%d\n", val); 1438668e48afSAnand Jain } 143925864778SAnand Jain BTRFS_ATTR(devid, missing, btrfs_devinfo_missing_show); 1440668e48afSAnand Jain 1441668e48afSAnand Jain static ssize_t btrfs_devinfo_replace_target_show(struct kobject *kobj, 1442668e48afSAnand Jain struct kobj_attribute *a, 1443668e48afSAnand Jain char *buf) 1444668e48afSAnand Jain { 1445668e48afSAnand Jain int val; 1446668e48afSAnand Jain struct btrfs_device *device = container_of(kobj, struct btrfs_device, 1447668e48afSAnand Jain devid_kobj); 1448668e48afSAnand Jain 1449668e48afSAnand Jain val = !!test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state); 1450668e48afSAnand Jain 1451abdd9febSTakashi Iwai return scnprintf(buf, PAGE_SIZE, "%d\n", val); 1452668e48afSAnand Jain } 1453668e48afSAnand Jain BTRFS_ATTR(devid, replace_target, btrfs_devinfo_replace_target_show); 1454668e48afSAnand Jain 1455eb3b5053SDavid Sterba static ssize_t btrfs_devinfo_scrub_speed_max_show(struct kobject *kobj, 1456eb3b5053SDavid Sterba struct kobj_attribute *a, 1457eb3b5053SDavid Sterba char *buf) 1458eb3b5053SDavid Sterba { 1459eb3b5053SDavid Sterba struct btrfs_device *device = container_of(kobj, struct btrfs_device, 1460eb3b5053SDavid Sterba devid_kobj); 1461eb3b5053SDavid Sterba 1462eb3b5053SDavid Sterba return scnprintf(buf, PAGE_SIZE, "%llu\n", 1463eb3b5053SDavid Sterba READ_ONCE(device->scrub_speed_max)); 1464eb3b5053SDavid Sterba } 1465eb3b5053SDavid Sterba 1466eb3b5053SDavid Sterba static ssize_t btrfs_devinfo_scrub_speed_max_store(struct kobject *kobj, 1467eb3b5053SDavid Sterba struct kobj_attribute *a, 1468eb3b5053SDavid Sterba const char *buf, size_t len) 1469eb3b5053SDavid Sterba { 1470eb3b5053SDavid Sterba struct btrfs_device *device = container_of(kobj, struct btrfs_device, 1471eb3b5053SDavid Sterba devid_kobj); 1472eb3b5053SDavid Sterba char *endptr; 1473eb3b5053SDavid Sterba unsigned long long limit; 1474eb3b5053SDavid Sterba 1475eb3b5053SDavid Sterba limit = memparse(buf, &endptr); 1476eb3b5053SDavid Sterba WRITE_ONCE(device->scrub_speed_max, limit); 1477eb3b5053SDavid Sterba return len; 1478eb3b5053SDavid Sterba } 1479eb3b5053SDavid Sterba BTRFS_ATTR_RW(devid, scrub_speed_max, btrfs_devinfo_scrub_speed_max_show, 1480eb3b5053SDavid Sterba btrfs_devinfo_scrub_speed_max_store); 1481eb3b5053SDavid Sterba 1482668e48afSAnand Jain static ssize_t btrfs_devinfo_writeable_show(struct kobject *kobj, 1483668e48afSAnand Jain struct kobj_attribute *a, char *buf) 1484668e48afSAnand Jain { 1485668e48afSAnand Jain int val; 1486668e48afSAnand Jain struct btrfs_device *device = container_of(kobj, struct btrfs_device, 1487668e48afSAnand Jain devid_kobj); 1488668e48afSAnand Jain 1489668e48afSAnand Jain val = !!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state); 1490668e48afSAnand Jain 1491abdd9febSTakashi Iwai return scnprintf(buf, PAGE_SIZE, "%d\n", val); 1492668e48afSAnand Jain } 1493668e48afSAnand Jain BTRFS_ATTR(devid, writeable, btrfs_devinfo_writeable_show); 1494668e48afSAnand Jain 1495da658b57SDavid Sterba static ssize_t btrfs_devinfo_error_stats_show(struct kobject *kobj, 1496da658b57SDavid Sterba struct kobj_attribute *a, char *buf) 1497da658b57SDavid Sterba { 1498da658b57SDavid Sterba struct btrfs_device *device = container_of(kobj, struct btrfs_device, 1499da658b57SDavid Sterba devid_kobj); 1500da658b57SDavid Sterba 1501da658b57SDavid Sterba if (!device->dev_stats_valid) 1502da658b57SDavid Sterba return scnprintf(buf, PAGE_SIZE, "invalid\n"); 1503da658b57SDavid Sterba 1504da658b57SDavid Sterba /* 1505da658b57SDavid Sterba * Print all at once so we get a snapshot of all values from the same 1506da658b57SDavid Sterba * time. Keep them in sync and in order of definition of 1507da658b57SDavid Sterba * btrfs_dev_stat_values. 1508da658b57SDavid Sterba */ 1509da658b57SDavid Sterba return scnprintf(buf, PAGE_SIZE, 1510da658b57SDavid Sterba "write_errs %d\n" 1511da658b57SDavid Sterba "read_errs %d\n" 1512da658b57SDavid Sterba "flush_errs %d\n" 1513da658b57SDavid Sterba "corruption_errs %d\n" 1514da658b57SDavid Sterba "generation_errs %d\n", 1515da658b57SDavid Sterba btrfs_dev_stat_read(device, BTRFS_DEV_STAT_WRITE_ERRS), 1516da658b57SDavid Sterba btrfs_dev_stat_read(device, BTRFS_DEV_STAT_READ_ERRS), 1517da658b57SDavid Sterba btrfs_dev_stat_read(device, BTRFS_DEV_STAT_FLUSH_ERRS), 1518da658b57SDavid Sterba btrfs_dev_stat_read(device, BTRFS_DEV_STAT_CORRUPTION_ERRS), 1519da658b57SDavid Sterba btrfs_dev_stat_read(device, BTRFS_DEV_STAT_GENERATION_ERRS)); 1520da658b57SDavid Sterba } 1521da658b57SDavid Sterba BTRFS_ATTR(devid, error_stats, btrfs_devinfo_error_stats_show); 1522da658b57SDavid Sterba 1523668e48afSAnand Jain static struct attribute *devid_attrs[] = { 1524da658b57SDavid Sterba BTRFS_ATTR_PTR(devid, error_stats), 1525668e48afSAnand Jain BTRFS_ATTR_PTR(devid, in_fs_metadata), 1526668e48afSAnand Jain BTRFS_ATTR_PTR(devid, missing), 1527668e48afSAnand Jain BTRFS_ATTR_PTR(devid, replace_target), 1528eb3b5053SDavid Sterba BTRFS_ATTR_PTR(devid, scrub_speed_max), 1529668e48afSAnand Jain BTRFS_ATTR_PTR(devid, writeable), 1530668e48afSAnand Jain NULL 1531668e48afSAnand Jain }; 1532668e48afSAnand Jain ATTRIBUTE_GROUPS(devid); 1533668e48afSAnand Jain 1534668e48afSAnand Jain static void btrfs_release_devid_kobj(struct kobject *kobj) 1535668e48afSAnand Jain { 1536668e48afSAnand Jain struct btrfs_device *device = container_of(kobj, struct btrfs_device, 1537668e48afSAnand Jain devid_kobj); 1538668e48afSAnand Jain 1539668e48afSAnand Jain memset(&device->devid_kobj, 0, sizeof(struct kobject)); 1540668e48afSAnand Jain complete(&device->kobj_unregister); 1541668e48afSAnand Jain } 1542668e48afSAnand Jain 1543668e48afSAnand Jain static struct kobj_type devid_ktype = { 1544668e48afSAnand Jain .sysfs_ops = &kobj_sysfs_ops, 1545668e48afSAnand Jain .default_groups = devid_groups, 1546668e48afSAnand Jain .release = btrfs_release_devid_kobj, 1547668e48afSAnand Jain }; 1548668e48afSAnand Jain 1549cd36da2eSAnand Jain int btrfs_sysfs_add_device(struct btrfs_device *device) 155029e5be24SJeff Mahoney { 1551178a16c9SAnand Jain int ret; 1552a47bd78dSJosef Bacik unsigned int nofs_flag; 1553178a16c9SAnand Jain struct kobject *devices_kobj; 1554178a16c9SAnand Jain struct kobject *devinfo_kobj; 1555178a16c9SAnand Jain 1556178a16c9SAnand Jain /* 1557178a16c9SAnand Jain * Make sure we use the fs_info::fs_devices to fetch the kobjects even 1558178a16c9SAnand Jain * for the seed fs_devices 1559178a16c9SAnand Jain */ 1560178a16c9SAnand Jain devices_kobj = device->fs_info->fs_devices->devices_kobj; 1561178a16c9SAnand Jain devinfo_kobj = device->fs_info->fs_devices->devinfo_kobj; 1562178a16c9SAnand Jain ASSERT(devices_kobj); 1563178a16c9SAnand Jain ASSERT(devinfo_kobj); 156429e5be24SJeff Mahoney 1565a47bd78dSJosef Bacik nofs_flag = memalloc_nofs_save(); 1566f085381eSAnand Jain 1567178a16c9SAnand Jain if (device->bdev) { 15688d65269fSChristoph Hellwig struct kobject *disk_kobj = bdev_kobj(device->bdev); 156929e5be24SJeff Mahoney 1570178a16c9SAnand Jain ret = sysfs_create_link(devices_kobj, disk_kobj, disk_kobj->name); 1571178a16c9SAnand Jain if (ret) { 1572178a16c9SAnand Jain btrfs_warn(device->fs_info, 1573178a16c9SAnand Jain "creating sysfs device link for devid %llu failed: %d", 1574178a16c9SAnand Jain device->devid, ret); 1575178a16c9SAnand Jain goto out; 1576178a16c9SAnand Jain } 157729e5be24SJeff Mahoney } 157829e5be24SJeff Mahoney 1579178a16c9SAnand Jain init_completion(&device->kobj_unregister); 1580178a16c9SAnand Jain ret = kobject_init_and_add(&device->devid_kobj, &devid_ktype, 1581178a16c9SAnand Jain devinfo_kobj, "%llu", device->devid); 1582178a16c9SAnand Jain if (ret) { 1583178a16c9SAnand Jain kobject_put(&device->devid_kobj); 1584178a16c9SAnand Jain btrfs_warn(device->fs_info, 1585178a16c9SAnand Jain "devinfo init for devid %llu failed: %d", 1586178a16c9SAnand Jain device->devid, ret); 1587668e48afSAnand Jain } 1588178a16c9SAnand Jain 1589178a16c9SAnand Jain out: 1590a47bd78dSJosef Bacik memalloc_nofs_restore(nofs_flag); 1591178a16c9SAnand Jain return ret; 1592178a16c9SAnand Jain } 1593668e48afSAnand Jain 1594cd36da2eSAnand Jain static int btrfs_sysfs_add_fs_devices(struct btrfs_fs_devices *fs_devices) 1595178a16c9SAnand Jain { 1596178a16c9SAnand Jain int ret; 1597cd36da2eSAnand Jain struct btrfs_device *device; 159830b0e4e0SAnand Jain struct btrfs_fs_devices *seed; 1599178a16c9SAnand Jain 1600178a16c9SAnand Jain list_for_each_entry(device, &fs_devices->devices, dev_list) { 1601178a16c9SAnand Jain ret = btrfs_sysfs_add_device(device); 1602178a16c9SAnand Jain if (ret) 16037ad3912aSAnand Jain goto fail; 1604178a16c9SAnand Jain } 1605178a16c9SAnand Jain 160630b0e4e0SAnand Jain list_for_each_entry(seed, &fs_devices->seed_list, seed_list) { 160730b0e4e0SAnand Jain list_for_each_entry(device, &seed->devices, dev_list) { 160830b0e4e0SAnand Jain ret = btrfs_sysfs_add_device(device); 160930b0e4e0SAnand Jain if (ret) 16107ad3912aSAnand Jain goto fail; 161130b0e4e0SAnand Jain } 161230b0e4e0SAnand Jain } 161330b0e4e0SAnand Jain 1614178a16c9SAnand Jain return 0; 16157ad3912aSAnand Jain 16167ad3912aSAnand Jain fail: 16177ad3912aSAnand Jain btrfs_sysfs_remove_fs_devices(fs_devices); 16187ad3912aSAnand Jain return ret; 161929e5be24SJeff Mahoney } 162029e5be24SJeff Mahoney 16215b28692eSDavid Sterba void btrfs_kobject_uevent(struct block_device *bdev, enum kobject_action action) 16225b28692eSDavid Sterba { 16235b28692eSDavid Sterba int ret; 16245b28692eSDavid Sterba 16255b28692eSDavid Sterba ret = kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, action); 16265b28692eSDavid Sterba if (ret) 16275b28692eSDavid Sterba pr_warn("BTRFS: Sending event '%d' to kobject: '%s' (%p): failed\n", 16285b28692eSDavid Sterba action, kobject_name(&disk_to_dev(bdev->bd_disk)->kobj), 16295b28692eSDavid Sterba &disk_to_dev(bdev->bd_disk)->kobj); 16305b28692eSDavid Sterba } 16315b28692eSDavid Sterba 16328e560081SNikolay Borisov void btrfs_sysfs_update_sprout_fsid(struct btrfs_fs_devices *fs_devices) 16338e560081SNikolay Borisov 1634f93c3997SDavid Sterba { 1635f93c3997SDavid Sterba char fsid_buf[BTRFS_UUID_UNPARSED_SIZE]; 1636f93c3997SDavid Sterba 1637f93c3997SDavid Sterba /* 1638f93c3997SDavid Sterba * Sprouting changes fsid of the mounted filesystem, rename the fsid 1639f93c3997SDavid Sterba * directory 1640f93c3997SDavid Sterba */ 16418e560081SNikolay Borisov snprintf(fsid_buf, BTRFS_UUID_UNPARSED_SIZE, "%pU", fs_devices->fsid); 1642f93c3997SDavid Sterba if (kobject_rename(&fs_devices->fsid_kobj, fsid_buf)) 1643f93c3997SDavid Sterba btrfs_warn(fs_devices->fs_info, 1644f93c3997SDavid Sterba "sysfs: failed to create fsid for sprout"); 1645f93c3997SDavid Sterba } 1646f93c3997SDavid Sterba 1647668e48afSAnand Jain void btrfs_sysfs_update_devid(struct btrfs_device *device) 1648668e48afSAnand Jain { 1649668e48afSAnand Jain char tmp[24]; 1650668e48afSAnand Jain 1651668e48afSAnand Jain snprintf(tmp, sizeof(tmp), "%llu", device->devid); 1652668e48afSAnand Jain 1653668e48afSAnand Jain if (kobject_rename(&device->devid_kobj, tmp)) 1654668e48afSAnand Jain btrfs_warn(device->fs_devices->fs_info, 1655668e48afSAnand Jain "sysfs: failed to update devid for %llu", 1656668e48afSAnand Jain device->devid); 1657668e48afSAnand Jain } 1658668e48afSAnand Jain 1659510d7360SJeff Mahoney /* /sys/fs/btrfs/ entry */ 1660510d7360SJeff Mahoney static struct kset *btrfs_kset; 1661510d7360SJeff Mahoney 166272059215SAnand Jain /* 1663c6761a9eSAnand Jain * Creates: 1664c6761a9eSAnand Jain * /sys/fs/btrfs/UUID 1665c6761a9eSAnand Jain * 166672059215SAnand Jain * Can be called by the device discovery thread. 166772059215SAnand Jain */ 1668c6761a9eSAnand Jain int btrfs_sysfs_add_fsid(struct btrfs_fs_devices *fs_devs) 16695ac1d209SJeff Mahoney { 16705ac1d209SJeff Mahoney int error; 16715ac1d209SJeff Mahoney 16722e7910d6SAnand Jain init_completion(&fs_devs->kobj_unregister); 1673c1b7e474SAnand Jain fs_devs->fsid_kobj.kset = btrfs_kset; 1674c6761a9eSAnand Jain error = kobject_init_and_add(&fs_devs->fsid_kobj, &btrfs_ktype, NULL, 1675c6761a9eSAnand Jain "%pU", fs_devs->fsid); 1676e3277335STobin C. Harding if (error) { 1677e3277335STobin C. Harding kobject_put(&fs_devs->fsid_kobj); 167872059215SAnand Jain return error; 167972059215SAnand Jain } 168072059215SAnand Jain 1681bc036bb3SAnand Jain fs_devs->devices_kobj = kobject_create_and_add("devices", 1682bc036bb3SAnand Jain &fs_devs->fsid_kobj); 1683bc036bb3SAnand Jain if (!fs_devs->devices_kobj) { 1684bc036bb3SAnand Jain btrfs_err(fs_devs->fs_info, 1685bc036bb3SAnand Jain "failed to init sysfs device interface"); 16861f6087e6SAnand Jain btrfs_sysfs_remove_fsid(fs_devs); 1687bc036bb3SAnand Jain return -ENOMEM; 1688bc036bb3SAnand Jain } 1689bc036bb3SAnand Jain 1690a013d141SAnand Jain fs_devs->devinfo_kobj = kobject_create_and_add("devinfo", 1691a013d141SAnand Jain &fs_devs->fsid_kobj); 1692a013d141SAnand Jain if (!fs_devs->devinfo_kobj) { 1693a013d141SAnand Jain btrfs_err(fs_devs->fs_info, 1694a013d141SAnand Jain "failed to init sysfs devinfo kobject"); 1695a013d141SAnand Jain btrfs_sysfs_remove_fsid(fs_devs); 1696a013d141SAnand Jain return -ENOMEM; 1697a013d141SAnand Jain } 1698a013d141SAnand Jain 1699e3277335STobin C. Harding return 0; 1700e3277335STobin C. Harding } 1701e3277335STobin C. Harding 170296f3136eSAnand Jain int btrfs_sysfs_add_mounted(struct btrfs_fs_info *fs_info) 170372059215SAnand Jain { 170472059215SAnand Jain int error; 17052e7910d6SAnand Jain struct btrfs_fs_devices *fs_devs = fs_info->fs_devices; 1706c1b7e474SAnand Jain struct kobject *fsid_kobj = &fs_devs->fsid_kobj; 170772059215SAnand Jain 1708cd36da2eSAnand Jain error = btrfs_sysfs_add_fs_devices(fs_devs); 1709e453d989SJeff Mahoney if (error) 1710e453d989SJeff Mahoney return error; 1711510d7360SJeff Mahoney 1712c1b7e474SAnand Jain error = sysfs_create_files(fsid_kobj, btrfs_attrs); 1713e453d989SJeff Mahoney if (error) { 171453f8a74cSAnand Jain btrfs_sysfs_remove_fs_devices(fs_devs); 1715e453d989SJeff Mahoney return error; 1716e453d989SJeff Mahoney } 171779da4fa4SJeff Mahoney 1718c1b7e474SAnand Jain error = sysfs_create_group(fsid_kobj, 17190dd2906fSAnand Jain &btrfs_feature_attr_group); 17200dd2906fSAnand Jain if (error) 17210dd2906fSAnand Jain goto failure; 17220dd2906fSAnand Jain 17236e369febSDavid Sterba #ifdef CONFIG_BTRFS_DEBUG 172493945cb4SDennis Zhou fs_info->debug_kobj = kobject_create_and_add("debug", fsid_kobj); 172593945cb4SDennis Zhou if (!fs_info->debug_kobj) { 172693945cb4SDennis Zhou error = -ENOMEM; 172793945cb4SDennis Zhou goto failure; 172893945cb4SDennis Zhou } 172993945cb4SDennis Zhou 173093945cb4SDennis Zhou error = sysfs_create_files(fs_info->debug_kobj, btrfs_debug_mount_attrs); 17316e369febSDavid Sterba if (error) 17326e369febSDavid Sterba goto failure; 1733e4faab84SDennis Zhou 1734e4faab84SDennis Zhou /* Discard directory */ 1735e4faab84SDennis Zhou fs_info->discard_debug_kobj = kobject_create_and_add("discard", 1736e4faab84SDennis Zhou fs_info->debug_kobj); 1737e4faab84SDennis Zhou if (!fs_info->discard_debug_kobj) { 1738e4faab84SDennis Zhou error = -ENOMEM; 1739e4faab84SDennis Zhou goto failure; 1740e4faab84SDennis Zhou } 1741e4faab84SDennis Zhou 1742e4faab84SDennis Zhou error = sysfs_create_files(fs_info->discard_debug_kobj, 1743e4faab84SDennis Zhou discard_debug_attrs); 1744e4faab84SDennis Zhou if (error) 1745e4faab84SDennis Zhou goto failure; 17466e369febSDavid Sterba #endif 17476e369febSDavid Sterba 1748e453d989SJeff Mahoney error = addrm_unknown_feature_attrs(fs_info, true); 174979da4fa4SJeff Mahoney if (error) 175079da4fa4SJeff Mahoney goto failure; 175179da4fa4SJeff Mahoney 17523092c68fSNikolay Borisov error = sysfs_create_link(fsid_kobj, &fs_info->sb->s_bdi->dev->kobj, "bdi"); 17533092c68fSNikolay Borisov if (error) 17543092c68fSNikolay Borisov goto failure; 17553092c68fSNikolay Borisov 17566ab0a202SJeff Mahoney fs_info->space_info_kobj = kobject_create_and_add("allocation", 1757c1b7e474SAnand Jain fsid_kobj); 17586ab0a202SJeff Mahoney if (!fs_info->space_info_kobj) { 17596ab0a202SJeff Mahoney error = -ENOMEM; 17606ab0a202SJeff Mahoney goto failure; 17616ab0a202SJeff Mahoney } 17626ab0a202SJeff Mahoney 17636ab0a202SJeff Mahoney error = sysfs_create_files(fs_info->space_info_kobj, allocation_attrs); 17646ab0a202SJeff Mahoney if (error) 17656ab0a202SJeff Mahoney goto failure; 17666ab0a202SJeff Mahoney 176779da4fa4SJeff Mahoney return 0; 176879da4fa4SJeff Mahoney failure: 17696618a59bSAnand Jain btrfs_sysfs_remove_mounted(fs_info); 17705ac1d209SJeff Mahoney return error; 17715ac1d209SJeff Mahoney } 17725ac1d209SJeff Mahoney 177349e5fb46SQu Wenruo static inline struct btrfs_fs_info *qgroup_kobj_to_fs_info(struct kobject *kobj) 177449e5fb46SQu Wenruo { 177549e5fb46SQu Wenruo return to_fs_info(kobj->parent->parent); 177649e5fb46SQu Wenruo } 177749e5fb46SQu Wenruo 177849e5fb46SQu Wenruo #define QGROUP_ATTR(_member, _show_name) \ 177949e5fb46SQu Wenruo static ssize_t btrfs_qgroup_show_##_member(struct kobject *qgroup_kobj, \ 178049e5fb46SQu Wenruo struct kobj_attribute *a, \ 178149e5fb46SQu Wenruo char *buf) \ 178249e5fb46SQu Wenruo { \ 178349e5fb46SQu Wenruo struct btrfs_fs_info *fs_info = qgroup_kobj_to_fs_info(qgroup_kobj); \ 178449e5fb46SQu Wenruo struct btrfs_qgroup *qgroup = container_of(qgroup_kobj, \ 178549e5fb46SQu Wenruo struct btrfs_qgroup, kobj); \ 178649e5fb46SQu Wenruo return btrfs_show_u64(&qgroup->_member, &fs_info->qgroup_lock, buf); \ 178749e5fb46SQu Wenruo } \ 178849e5fb46SQu Wenruo BTRFS_ATTR(qgroup, _show_name, btrfs_qgroup_show_##_member) 178949e5fb46SQu Wenruo 179049e5fb46SQu Wenruo #define QGROUP_RSV_ATTR(_name, _type) \ 179149e5fb46SQu Wenruo static ssize_t btrfs_qgroup_rsv_show_##_name(struct kobject *qgroup_kobj, \ 179249e5fb46SQu Wenruo struct kobj_attribute *a, \ 179349e5fb46SQu Wenruo char *buf) \ 179449e5fb46SQu Wenruo { \ 179549e5fb46SQu Wenruo struct btrfs_fs_info *fs_info = qgroup_kobj_to_fs_info(qgroup_kobj); \ 179649e5fb46SQu Wenruo struct btrfs_qgroup *qgroup = container_of(qgroup_kobj, \ 179749e5fb46SQu Wenruo struct btrfs_qgroup, kobj); \ 179849e5fb46SQu Wenruo return btrfs_show_u64(&qgroup->rsv.values[_type], \ 179949e5fb46SQu Wenruo &fs_info->qgroup_lock, buf); \ 180049e5fb46SQu Wenruo } \ 180149e5fb46SQu Wenruo BTRFS_ATTR(qgroup, rsv_##_name, btrfs_qgroup_rsv_show_##_name) 180249e5fb46SQu Wenruo 180349e5fb46SQu Wenruo QGROUP_ATTR(rfer, referenced); 180449e5fb46SQu Wenruo QGROUP_ATTR(excl, exclusive); 180549e5fb46SQu Wenruo QGROUP_ATTR(max_rfer, max_referenced); 180649e5fb46SQu Wenruo QGROUP_ATTR(max_excl, max_exclusive); 180749e5fb46SQu Wenruo QGROUP_ATTR(lim_flags, limit_flags); 180849e5fb46SQu Wenruo QGROUP_RSV_ATTR(data, BTRFS_QGROUP_RSV_DATA); 180949e5fb46SQu Wenruo QGROUP_RSV_ATTR(meta_pertrans, BTRFS_QGROUP_RSV_META_PERTRANS); 181049e5fb46SQu Wenruo QGROUP_RSV_ATTR(meta_prealloc, BTRFS_QGROUP_RSV_META_PREALLOC); 181149e5fb46SQu Wenruo 181249e5fb46SQu Wenruo static struct attribute *qgroup_attrs[] = { 181349e5fb46SQu Wenruo BTRFS_ATTR_PTR(qgroup, referenced), 181449e5fb46SQu Wenruo BTRFS_ATTR_PTR(qgroup, exclusive), 181549e5fb46SQu Wenruo BTRFS_ATTR_PTR(qgroup, max_referenced), 181649e5fb46SQu Wenruo BTRFS_ATTR_PTR(qgroup, max_exclusive), 181749e5fb46SQu Wenruo BTRFS_ATTR_PTR(qgroup, limit_flags), 181849e5fb46SQu Wenruo BTRFS_ATTR_PTR(qgroup, rsv_data), 181949e5fb46SQu Wenruo BTRFS_ATTR_PTR(qgroup, rsv_meta_pertrans), 182049e5fb46SQu Wenruo BTRFS_ATTR_PTR(qgroup, rsv_meta_prealloc), 182149e5fb46SQu Wenruo NULL 182249e5fb46SQu Wenruo }; 182349e5fb46SQu Wenruo ATTRIBUTE_GROUPS(qgroup); 182449e5fb46SQu Wenruo 182549e5fb46SQu Wenruo static void qgroup_release(struct kobject *kobj) 182649e5fb46SQu Wenruo { 182749e5fb46SQu Wenruo struct btrfs_qgroup *qgroup = container_of(kobj, struct btrfs_qgroup, kobj); 182849e5fb46SQu Wenruo 182949e5fb46SQu Wenruo memset(&qgroup->kobj, 0, sizeof(*kobj)); 183049e5fb46SQu Wenruo } 183149e5fb46SQu Wenruo 183249e5fb46SQu Wenruo static struct kobj_type qgroup_ktype = { 183349e5fb46SQu Wenruo .sysfs_ops = &kobj_sysfs_ops, 183449e5fb46SQu Wenruo .release = qgroup_release, 183549e5fb46SQu Wenruo .default_groups = qgroup_groups, 183649e5fb46SQu Wenruo }; 183749e5fb46SQu Wenruo 183849e5fb46SQu Wenruo int btrfs_sysfs_add_one_qgroup(struct btrfs_fs_info *fs_info, 183949e5fb46SQu Wenruo struct btrfs_qgroup *qgroup) 184049e5fb46SQu Wenruo { 184149e5fb46SQu Wenruo struct kobject *qgroups_kobj = fs_info->qgroups_kobj; 184249e5fb46SQu Wenruo int ret; 184349e5fb46SQu Wenruo 184449e5fb46SQu Wenruo if (test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state)) 184549e5fb46SQu Wenruo return 0; 184649e5fb46SQu Wenruo if (qgroup->kobj.state_initialized) 184749e5fb46SQu Wenruo return 0; 184849e5fb46SQu Wenruo if (!qgroups_kobj) 184949e5fb46SQu Wenruo return -EINVAL; 185049e5fb46SQu Wenruo 185149e5fb46SQu Wenruo ret = kobject_init_and_add(&qgroup->kobj, &qgroup_ktype, qgroups_kobj, 185249e5fb46SQu Wenruo "%hu_%llu", btrfs_qgroup_level(qgroup->qgroupid), 185349e5fb46SQu Wenruo btrfs_qgroup_subvolid(qgroup->qgroupid)); 185449e5fb46SQu Wenruo if (ret < 0) 185549e5fb46SQu Wenruo kobject_put(&qgroup->kobj); 185649e5fb46SQu Wenruo 185749e5fb46SQu Wenruo return ret; 185849e5fb46SQu Wenruo } 185949e5fb46SQu Wenruo 186049e5fb46SQu Wenruo void btrfs_sysfs_del_qgroups(struct btrfs_fs_info *fs_info) 186149e5fb46SQu Wenruo { 186249e5fb46SQu Wenruo struct btrfs_qgroup *qgroup; 186349e5fb46SQu Wenruo struct btrfs_qgroup *next; 186449e5fb46SQu Wenruo 186549e5fb46SQu Wenruo if (test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state)) 186649e5fb46SQu Wenruo return; 186749e5fb46SQu Wenruo 186849e5fb46SQu Wenruo rbtree_postorder_for_each_entry_safe(qgroup, next, 186949e5fb46SQu Wenruo &fs_info->qgroup_tree, node) 187049e5fb46SQu Wenruo btrfs_sysfs_del_one_qgroup(fs_info, qgroup); 187162ab2cc0SQu Wenruo if (fs_info->qgroups_kobj) { 187249e5fb46SQu Wenruo kobject_del(fs_info->qgroups_kobj); 187349e5fb46SQu Wenruo kobject_put(fs_info->qgroups_kobj); 187449e5fb46SQu Wenruo fs_info->qgroups_kobj = NULL; 187549e5fb46SQu Wenruo } 187662ab2cc0SQu Wenruo } 187749e5fb46SQu Wenruo 187849e5fb46SQu Wenruo /* Called when qgroups get initialized, thus there is no need for locking */ 187949e5fb46SQu Wenruo int btrfs_sysfs_add_qgroups(struct btrfs_fs_info *fs_info) 188049e5fb46SQu Wenruo { 188149e5fb46SQu Wenruo struct kobject *fsid_kobj = &fs_info->fs_devices->fsid_kobj; 188249e5fb46SQu Wenruo struct btrfs_qgroup *qgroup; 188349e5fb46SQu Wenruo struct btrfs_qgroup *next; 188449e5fb46SQu Wenruo int ret = 0; 188549e5fb46SQu Wenruo 188649e5fb46SQu Wenruo if (test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state)) 188749e5fb46SQu Wenruo return 0; 188849e5fb46SQu Wenruo 188949e5fb46SQu Wenruo ASSERT(fsid_kobj); 189049e5fb46SQu Wenruo if (fs_info->qgroups_kobj) 189149e5fb46SQu Wenruo return 0; 189249e5fb46SQu Wenruo 189349e5fb46SQu Wenruo fs_info->qgroups_kobj = kobject_create_and_add("qgroups", fsid_kobj); 189449e5fb46SQu Wenruo if (!fs_info->qgroups_kobj) { 189549e5fb46SQu Wenruo ret = -ENOMEM; 189649e5fb46SQu Wenruo goto out; 189749e5fb46SQu Wenruo } 189849e5fb46SQu Wenruo rbtree_postorder_for_each_entry_safe(qgroup, next, 189949e5fb46SQu Wenruo &fs_info->qgroup_tree, node) { 190049e5fb46SQu Wenruo ret = btrfs_sysfs_add_one_qgroup(fs_info, qgroup); 190149e5fb46SQu Wenruo if (ret < 0) 190249e5fb46SQu Wenruo goto out; 190349e5fb46SQu Wenruo } 190449e5fb46SQu Wenruo 190549e5fb46SQu Wenruo out: 190649e5fb46SQu Wenruo if (ret < 0) 190749e5fb46SQu Wenruo btrfs_sysfs_del_qgroups(fs_info); 190849e5fb46SQu Wenruo return ret; 190949e5fb46SQu Wenruo } 191049e5fb46SQu Wenruo 191149e5fb46SQu Wenruo void btrfs_sysfs_del_one_qgroup(struct btrfs_fs_info *fs_info, 191249e5fb46SQu Wenruo struct btrfs_qgroup *qgroup) 191349e5fb46SQu Wenruo { 191449e5fb46SQu Wenruo if (test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state)) 191549e5fb46SQu Wenruo return; 191649e5fb46SQu Wenruo 191749e5fb46SQu Wenruo if (qgroup->kobj.state_initialized) { 191849e5fb46SQu Wenruo kobject_del(&qgroup->kobj); 191949e5fb46SQu Wenruo kobject_put(&qgroup->kobj); 192049e5fb46SQu Wenruo } 192149e5fb46SQu Wenruo } 1922444e7516SDavid Sterba 1923444e7516SDavid Sterba /* 1924444e7516SDavid Sterba * Change per-fs features in /sys/fs/btrfs/UUID/features to match current 1925444e7516SDavid Sterba * values in superblock. Call after any changes to incompat/compat_ro flags 1926444e7516SDavid Sterba */ 1927444e7516SDavid Sterba void btrfs_sysfs_feature_update(struct btrfs_fs_info *fs_info, 1928444e7516SDavid Sterba u64 bit, enum btrfs_feature_set set) 1929444e7516SDavid Sterba { 1930444e7516SDavid Sterba struct btrfs_fs_devices *fs_devs; 1931444e7516SDavid Sterba struct kobject *fsid_kobj; 193224646481SLeon Romanovsky u64 __maybe_unused features; 193324646481SLeon Romanovsky int __maybe_unused ret; 1934444e7516SDavid Sterba 1935444e7516SDavid Sterba if (!fs_info) 1936444e7516SDavid Sterba return; 1937444e7516SDavid Sterba 193824646481SLeon Romanovsky /* 193924646481SLeon Romanovsky * See 14e46e04958df74 and e410e34fad913dd, feature bit updates are not 194024646481SLeon Romanovsky * safe when called from some contexts (eg. balance) 194124646481SLeon Romanovsky */ 1942444e7516SDavid Sterba features = get_features(fs_info, set); 1943444e7516SDavid Sterba ASSERT(bit & supported_feature_masks[set]); 1944444e7516SDavid Sterba 1945444e7516SDavid Sterba fs_devs = fs_info->fs_devices; 1946444e7516SDavid Sterba fsid_kobj = &fs_devs->fsid_kobj; 1947444e7516SDavid Sterba 1948bf609206SDavid Sterba if (!fsid_kobj->state_initialized) 1949bf609206SDavid Sterba return; 1950bf609206SDavid Sterba 1951444e7516SDavid Sterba /* 1952444e7516SDavid Sterba * FIXME: this is too heavy to update just one value, ideally we'd like 1953444e7516SDavid Sterba * to use sysfs_update_group but some refactoring is needed first. 1954444e7516SDavid Sterba */ 1955444e7516SDavid Sterba sysfs_remove_group(fsid_kobj, &btrfs_feature_attr_group); 1956444e7516SDavid Sterba ret = sysfs_create_group(fsid_kobj, &btrfs_feature_attr_group); 1957444e7516SDavid Sterba } 1958444e7516SDavid Sterba 1959f5c29bd9SLiu Bo int __init btrfs_init_sysfs(void) 196058176a96SJosef Bacik { 1961079b72bcSJeff Mahoney int ret; 19621bae3098SDavid Sterba 1963e3fe4e71SGreg KH btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj); 1964e3fe4e71SGreg KH if (!btrfs_kset) 1965e3fe4e71SGreg KH return -ENOMEM; 1966079b72bcSJeff Mahoney 19671bae3098SDavid Sterba init_feature_attrs(); 19681bae3098SDavid Sterba ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); 1969001a648dSFilipe Manana if (ret) 1970001a648dSFilipe Manana goto out2; 1971f902bd3aSMisono Tomohiro ret = sysfs_merge_group(&btrfs_kset->kobj, 1972f902bd3aSMisono Tomohiro &btrfs_static_feature_attr_group); 1973f902bd3aSMisono Tomohiro if (ret) 1974f902bd3aSMisono Tomohiro goto out_remove_group; 1975001a648dSFilipe Manana 19766e369febSDavid Sterba #ifdef CONFIG_BTRFS_DEBUG 19776e369febSDavid Sterba ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_debug_feature_attr_group); 19786e369febSDavid Sterba if (ret) 19796e369febSDavid Sterba goto out2; 19806e369febSDavid Sterba #endif 19816e369febSDavid Sterba 1982001a648dSFilipe Manana return 0; 1983f902bd3aSMisono Tomohiro 1984f902bd3aSMisono Tomohiro out_remove_group: 1985f902bd3aSMisono Tomohiro sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); 1986001a648dSFilipe Manana out2: 1987001a648dSFilipe Manana kset_unregister(btrfs_kset); 19881bae3098SDavid Sterba 19891bae3098SDavid Sterba return ret; 199058176a96SJosef Bacik } 199158176a96SJosef Bacik 1992e67c718bSDavid Sterba void __cold btrfs_exit_sysfs(void) 199358176a96SJosef Bacik { 1994f902bd3aSMisono Tomohiro sysfs_unmerge_group(&btrfs_kset->kobj, 1995f902bd3aSMisono Tomohiro &btrfs_static_feature_attr_group); 1996079b72bcSJeff Mahoney sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); 199771e8978eSDennis Zhou #ifdef CONFIG_BTRFS_DEBUG 199871e8978eSDennis Zhou sysfs_remove_group(&btrfs_kset->kobj, &btrfs_debug_feature_attr_group); 199971e8978eSDennis Zhou #endif 2000e3fe4e71SGreg KH kset_unregister(btrfs_kset); 200158176a96SJosef Bacik } 200255d47414SChris Mason 2003