| /* |
| * Copyright (C) 2007 Oracle. All rights reserved. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public |
| * License v2 as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public |
| * License along with this program; if not, write to the |
| * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| * Boston, MA 021110-1307, USA. |
| */ |
| |
| #include <linux/sched.h> |
| #include <linux/slab.h> |
| #include <linux/spinlock.h> |
| #include <linux/completion.h> |
| #include <linux/buffer_head.h> |
| #include <linux/kobject.h> |
| #include <linux/bug.h> |
| #include <linux/genhd.h> |
| #include <linux/debugfs.h> |
| |
| #include "ctree.h" |
| #include "disk-io.h" |
| #include "transaction.h" |
| #include "sysfs.h" |
| #include "volumes.h" |
| |
| static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj); |
| |
| static u64 get_features(struct btrfs_fs_info *fs_info, |
| enum btrfs_feature_set set) |
| { |
| struct btrfs_super_block *disk_super = fs_info->super_copy; |
| if (set == FEAT_COMPAT) |
| return btrfs_super_compat_flags(disk_super); |
| else if (set == FEAT_COMPAT_RO) |
| return btrfs_super_compat_ro_flags(disk_super); |
| else |
| return btrfs_super_incompat_flags(disk_super); |
| } |
| |
| static void set_features(struct btrfs_fs_info *fs_info, |
| enum btrfs_feature_set set, u64 features) |
| { |
| struct btrfs_super_block *disk_super = fs_info->super_copy; |
| if (set == FEAT_COMPAT) |
| btrfs_set_super_compat_flags(disk_super, features); |
| else if (set == FEAT_COMPAT_RO) |
| btrfs_set_super_compat_ro_flags(disk_super, features); |
| else |
| btrfs_set_super_incompat_flags(disk_super, features); |
| } |
| |
| static int can_modify_feature(struct btrfs_feature_attr *fa) |
| { |
| int val = 0; |
| u64 set, clear; |
| switch (fa->feature_set) { |
| case FEAT_COMPAT: |
| set = BTRFS_FEATURE_COMPAT_SAFE_SET; |
| clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR; |
| break; |
| case FEAT_COMPAT_RO: |
| set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET; |
| clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR; |
| break; |
| case FEAT_INCOMPAT: |
| set = BTRFS_FEATURE_INCOMPAT_SAFE_SET; |
| clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR; |
| break; |
| default: |
| printk(KERN_WARNING "btrfs: sysfs: unknown feature set %d\n", |
| fa->feature_set); |
| return 0; |
| } |
| |
| if (set & fa->feature_bit) |
| val |= 1; |
| if (clear & fa->feature_bit) |
| val |= 2; |
| |
| return val; |
| } |
| |
| static ssize_t btrfs_feature_attr_show(struct kobject *kobj, |
| struct kobj_attribute *a, char *buf) |
| { |
| int val = 0; |
| struct btrfs_fs_info *fs_info = to_fs_info(kobj); |
| struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a); |
| if (fs_info) { |
| u64 features = get_features(fs_info, fa->feature_set); |
| if (features & fa->feature_bit) |
| val = 1; |
| } else |
| val = can_modify_feature(fa); |
| |
| return snprintf(buf, PAGE_SIZE, "%d\n", val); |
| } |
| |
| static ssize_t btrfs_feature_attr_store(struct kobject *kobj, |
| struct kobj_attribute *a, |
| const char *buf, size_t count) |
| { |
| struct btrfs_fs_info *fs_info; |
| struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a); |
| struct btrfs_trans_handle *trans; |
| u64 features, set, clear; |
| unsigned long val; |
| int ret; |
| |
| fs_info = to_fs_info(kobj); |
| if (!fs_info) |
| return -EPERM; |
| |
| ret = kstrtoul(skip_spaces(buf), 0, &val); |
| if (ret) |
| return ret; |
| |
| if (fa->feature_set == FEAT_COMPAT) { |
| set = BTRFS_FEATURE_COMPAT_SAFE_SET; |
| clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR; |
| } else if (fa->feature_set == FEAT_COMPAT_RO) { |
| set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET; |
| clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR; |
| } else { |
| set = BTRFS_FEATURE_INCOMPAT_SAFE_SET; |
| clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR; |
| } |
| |
| features = get_features(fs_info, fa->feature_set); |
| |
| /* Nothing to do */ |
| if ((val && (features & fa->feature_bit)) || |
| (!val && !(features & fa->feature_bit))) |
| return count; |
| |
| if ((val && !(set & fa->feature_bit)) || |
| (!val && !(clear & fa->feature_bit))) { |
| btrfs_info(fs_info, |
| "%sabling feature %s on mounted fs is not supported.", |
| val ? "En" : "Dis", fa->kobj_attr.attr.name); |
| return -EPERM; |
| } |
| |
| btrfs_info(fs_info, "%s %s feature flag", |
| val ? "Setting" : "Clearing", fa->kobj_attr.attr.name); |
| |
| trans = btrfs_start_transaction(fs_info->fs_root, 0); |
| if (IS_ERR(trans)) |
| return PTR_ERR(trans); |
| |
| spin_lock(&fs_info->super_lock); |
| features = get_features(fs_info, fa->feature_set); |
| if (val) |
| features |= fa->feature_bit; |
| else |
| features &= ~fa->feature_bit; |
| set_features(fs_info, fa->feature_set, features); |
| spin_unlock(&fs_info->super_lock); |
| |
| ret = btrfs_commit_transaction(trans, fs_info->fs_root); |
| if (ret) |
| return ret; |
| |
| return count; |
| } |
| |
| static umode_t btrfs_feature_visible(struct kobject *kobj, |
| struct attribute *attr, int unused) |
| { |
| struct btrfs_fs_info *fs_info = to_fs_info(kobj); |
| umode_t mode = attr->mode; |
| |
| if (fs_info) { |
| struct btrfs_feature_attr *fa; |
| u64 features; |
| |
| fa = attr_to_btrfs_feature_attr(attr); |
| features = get_features(fs_info, fa->feature_set); |
| |
| if (can_modify_feature(fa)) |
| mode |= S_IWUSR; |
| else if (!(features & fa->feature_bit)) |
| mode = 0; |
| } |
| |
| return mode; |
| } |
| |
| BTRFS_FEAT_ATTR_INCOMPAT(mixed_backref, MIXED_BACKREF); |
| BTRFS_FEAT_ATTR_INCOMPAT(default_subvol, DEFAULT_SUBVOL); |
| BTRFS_FEAT_ATTR_INCOMPAT(mixed_groups, MIXED_GROUPS); |
| BTRFS_FEAT_ATTR_INCOMPAT(compress_lzo, COMPRESS_LZO); |
| BTRFS_FEAT_ATTR_INCOMPAT(big_metadata, BIG_METADATA); |
| BTRFS_FEAT_ATTR_INCOMPAT(extended_iref, EXTENDED_IREF); |
| BTRFS_FEAT_ATTR_INCOMPAT(raid56, RAID56); |
| BTRFS_FEAT_ATTR_INCOMPAT(skinny_metadata, SKINNY_METADATA); |
| BTRFS_FEAT_ATTR_INCOMPAT(no_holes, NO_HOLES); |
| |
| static struct attribute *btrfs_supported_feature_attrs[] = { |
| BTRFS_FEAT_ATTR_PTR(mixed_backref), |
| BTRFS_FEAT_ATTR_PTR(default_subvol), |
| BTRFS_FEAT_ATTR_PTR(mixed_groups), |
| BTRFS_FEAT_ATTR_PTR(compress_lzo), |
| BTRFS_FEAT_ATTR_PTR(big_metadata), |
| BTRFS_FEAT_ATTR_PTR(extended_iref), |
| BTRFS_FEAT_ATTR_PTR(raid56), |
| BTRFS_FEAT_ATTR_PTR(skinny_metadata), |
| BTRFS_FEAT_ATTR_PTR(no_holes), |
| NULL |
| }; |
| |
| static const struct attribute_group btrfs_feature_attr_group = { |
| .name = "features", |
| .is_visible = btrfs_feature_visible, |
| .attrs = btrfs_supported_feature_attrs, |
| }; |
| |
| static ssize_t btrfs_show_u64(u64 *value_ptr, spinlock_t *lock, char *buf) |
| { |
| u64 val; |
| if (lock) |
| spin_lock(lock); |
| val = *value_ptr; |
| if (lock) |
| spin_unlock(lock); |
| return snprintf(buf, PAGE_SIZE, "%llu\n", val); |
| } |
| |
| static ssize_t global_rsv_size_show(struct kobject *kobj, |
| struct kobj_attribute *ka, char *buf) |
| { |
| struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); |
| struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; |
| return btrfs_show_u64(&block_rsv->size, &block_rsv->lock, buf); |
| } |
| BTRFS_ATTR(global_rsv_size, 0444, global_rsv_size_show); |
| |
| static ssize_t global_rsv_reserved_show(struct kobject *kobj, |
| struct kobj_attribute *a, char *buf) |
| { |
| struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); |
| struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; |
| return btrfs_show_u64(&block_rsv->reserved, &block_rsv->lock, buf); |
| } |
| BTRFS_ATTR(global_rsv_reserved, 0444, global_rsv_reserved_show); |
| |
| #define to_space_info(_kobj) container_of(_kobj, struct btrfs_space_info, kobj) |
| |
| static ssize_t raid_bytes_show(struct kobject *kobj, |
| struct kobj_attribute *attr, char *buf); |
| BTRFS_RAID_ATTR(total_bytes, raid_bytes_show); |
| BTRFS_RAID_ATTR(used_bytes, raid_bytes_show); |
| |
| static ssize_t raid_bytes_show(struct kobject *kobj, |
| struct kobj_attribute *attr, char *buf) |
| |
| { |
| struct btrfs_space_info *sinfo = to_space_info(kobj->parent); |
| struct btrfs_block_group_cache *block_group; |
| int index = kobj - sinfo->block_group_kobjs; |
| u64 val = 0; |
| |
| down_read(&sinfo->groups_sem); |
| list_for_each_entry(block_group, &sinfo->block_groups[index], list) { |
| if (&attr->attr == BTRFS_RAID_ATTR_PTR(total_bytes)) |
| val += block_group->key.offset; |
| else |
| val += btrfs_block_group_used(&block_group->item); |
| } |
| up_read(&sinfo->groups_sem); |
| return snprintf(buf, PAGE_SIZE, "%llu\n", val); |
| } |
| |
| static struct attribute *raid_attributes[] = { |
| BTRFS_RAID_ATTR_PTR(total_bytes), |
| BTRFS_RAID_ATTR_PTR(used_bytes), |
| NULL |
| }; |
| |
| static void release_raid_kobj(struct kobject *kobj) |
| { |
| kobject_put(kobj->parent); |
| } |
| |
| struct kobj_type btrfs_raid_ktype = { |
| .sysfs_ops = &kobj_sysfs_ops, |
| .release = release_raid_kobj, |
| .default_attrs = raid_attributes, |
| }; |
| |
| #define SPACE_INFO_ATTR(field) \ |
| static ssize_t btrfs_space_info_show_##field(struct kobject *kobj, \ |
| struct kobj_attribute *a, \ |
| char *buf) \ |
| { \ |
| struct btrfs_space_info *sinfo = to_space_info(kobj); \ |
| return btrfs_show_u64(&sinfo->field, &sinfo->lock, buf); \ |
| } \ |
| BTRFS_ATTR(field, 0444, btrfs_space_info_show_##field) |
| |
| static ssize_t btrfs_space_info_show_total_bytes_pinned(struct kobject *kobj, |
| struct kobj_attribute *a, |
| char *buf) |
| { |
| struct btrfs_space_info *sinfo = to_space_info(kobj); |
| s64 val = percpu_counter_sum(&sinfo->total_bytes_pinned); |
| return snprintf(buf, PAGE_SIZE, "%lld\n", val); |
| } |
| |
| SPACE_INFO_ATTR(flags); |
| SPACE_INFO_ATTR(total_bytes); |
| SPACE_INFO_ATTR(bytes_used); |
| SPACE_INFO_ATTR(bytes_pinned); |
| SPACE_INFO_ATTR(bytes_reserved); |
| SPACE_INFO_ATTR(bytes_may_use); |
| SPACE_INFO_ATTR(disk_used); |
| SPACE_INFO_ATTR(disk_total); |
| BTRFS_ATTR(total_bytes_pinned, 0444, btrfs_space_info_show_total_bytes_pinned); |
| |
| static struct attribute *space_info_attrs[] = { |
| BTRFS_ATTR_PTR(flags), |
| BTRFS_ATTR_PTR(total_bytes), |
| BTRFS_ATTR_PTR(bytes_used), |
| BTRFS_ATTR_PTR(bytes_pinned), |
| BTRFS_ATTR_PTR(bytes_reserved), |
| BTRFS_ATTR_PTR(bytes_may_use), |
| BTRFS_ATTR_PTR(disk_used), |
| BTRFS_ATTR_PTR(disk_total), |
| BTRFS_ATTR_PTR(total_bytes_pinned), |
| NULL, |
| }; |
| |
| static void space_info_release(struct kobject *kobj) |
| { |
| struct btrfs_space_info *sinfo = to_space_info(kobj); |
| percpu_counter_destroy(&sinfo->total_bytes_pinned); |
| kfree(sinfo); |
| } |
| |
| struct kobj_type space_info_ktype = { |
| .sysfs_ops = &kobj_sysfs_ops, |
| .release = space_info_release, |
| .default_attrs = space_info_attrs, |
| }; |
| |
| static const struct attribute *allocation_attrs[] = { |
| BTRFS_ATTR_PTR(global_rsv_reserved), |
| BTRFS_ATTR_PTR(global_rsv_size), |
| NULL, |
| }; |
| |
| static ssize_t btrfs_label_show(struct kobject *kobj, |
| struct kobj_attribute *a, char *buf) |
| { |
| struct btrfs_fs_info *fs_info = to_fs_info(kobj); |
| return snprintf(buf, PAGE_SIZE, "%s\n", fs_info->super_copy->label); |
| } |
| |
| static ssize_t btrfs_label_store(struct kobject *kobj, |
| struct kobj_attribute *a, |
| const char *buf, size_t len) |
| { |
| struct btrfs_fs_info *fs_info = to_fs_info(kobj); |
| struct btrfs_trans_handle *trans; |
| struct btrfs_root *root = fs_info->fs_root; |
| int ret; |
| |
| if (len >= BTRFS_LABEL_SIZE) { |
| pr_err("BTRFS: unable to set label with more than %d bytes\n", |
| BTRFS_LABEL_SIZE - 1); |
| return -EINVAL; |
| } |
| |
| trans = btrfs_start_transaction(root, 0); |
| if (IS_ERR(trans)) |
| return PTR_ERR(trans); |
| |
| spin_lock(&root->fs_info->super_lock); |
| strcpy(fs_info->super_copy->label, buf); |
| spin_unlock(&root->fs_info->super_lock); |
| ret = btrfs_commit_transaction(trans, root); |
| |
| if (!ret) |
| return len; |
| |
| return ret; |
| } |
| BTRFS_ATTR_RW(label, 0644, btrfs_label_show, btrfs_label_store); |
| |
| static ssize_t btrfs_no_store(struct kobject *kobj, |
| struct kobj_attribute *a, |
| const char *buf, size_t len) |
| { |
| return -EPERM; |
| } |
| |
| static ssize_t btrfs_nodesize_show(struct kobject *kobj, |
| struct kobj_attribute *a, char *buf) |
| { |
| struct btrfs_fs_info *fs_info = to_fs_info(kobj); |
| |
| return snprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->nodesize); |
| } |
| |
| BTRFS_ATTR_RW(nodesize, 0444, btrfs_nodesize_show, btrfs_no_store); |
| |
| static ssize_t btrfs_sectorsize_show(struct kobject *kobj, |
| struct kobj_attribute *a, char *buf) |
| { |
| struct btrfs_fs_info *fs_info = to_fs_info(kobj); |
| |
| return snprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->sectorsize); |
| } |
| |
| BTRFS_ATTR_RW(sectorsize, 0444, btrfs_sectorsize_show, btrfs_no_store); |
| |
| static ssize_t btrfs_clone_alignment_show(struct kobject *kobj, |
| struct kobj_attribute *a, char *buf) |
| { |
| struct btrfs_fs_info *fs_info = to_fs_info(kobj); |
| |
| return snprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->sectorsize); |
| } |
| |
| BTRFS_ATTR_RW(clone_alignment, 0444, btrfs_clone_alignment_show, btrfs_no_store); |
| |
| static struct attribute *btrfs_attrs[] = { |
| BTRFS_ATTR_PTR(label), |
| BTRFS_ATTR_PTR(nodesize), |
| BTRFS_ATTR_PTR(sectorsize), |
| BTRFS_ATTR_PTR(clone_alignment), |
| NULL, |
| }; |
| |
| static void btrfs_release_super_kobj(struct kobject *kobj) |
| { |
| struct btrfs_fs_info *fs_info = to_fs_info(kobj); |
| complete(&fs_info->kobj_unregister); |
| } |
| |
| static struct kobj_type btrfs_ktype = { |
| .sysfs_ops = &kobj_sysfs_ops, |
| .release = btrfs_release_super_kobj, |
| .default_attrs = btrfs_attrs, |
| }; |
| |
| static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj) |
| { |
| if (kobj->ktype != &btrfs_ktype) |
| return NULL; |
| return container_of(kobj, struct btrfs_fs_info, super_kobj); |
| } |
| |
| #define NUM_FEATURE_BITS 64 |
| static char btrfs_unknown_feature_names[3][NUM_FEATURE_BITS][13]; |
| static struct btrfs_feature_attr btrfs_feature_attrs[3][NUM_FEATURE_BITS]; |
| |
| static u64 supported_feature_masks[3] = { |
| [FEAT_COMPAT] = BTRFS_FEATURE_COMPAT_SUPP, |
| [FEAT_COMPAT_RO] = BTRFS_FEATURE_COMPAT_RO_SUPP, |
| [FEAT_INCOMPAT] = BTRFS_FEATURE_INCOMPAT_SUPP, |
| }; |
| |
| static int addrm_unknown_feature_attrs(struct btrfs_fs_info *fs_info, bool add) |
| { |
| int set; |
| |
| for (set = 0; set < FEAT_MAX; set++) { |
| int i; |
| struct attribute *attrs[2]; |
| struct attribute_group agroup = { |
| .name = "features", |
| .attrs = attrs, |
| }; |
| u64 features = get_features(fs_info, set); |
| features &= ~supported_feature_masks[set]; |
| |
| if (!features) |
| continue; |
| |
| attrs[1] = NULL; |
| for (i = 0; i < NUM_FEATURE_BITS; i++) { |
| struct btrfs_feature_attr *fa; |
| |
| if (!(features & (1ULL << i))) |
| continue; |
| |
| fa = &btrfs_feature_attrs[set][i]; |
| attrs[0] = &fa->kobj_attr.attr; |
| if (add) { |
| int ret; |
| ret = sysfs_merge_group(&fs_info->super_kobj, |
| &agroup); |
| if (ret) |
| return ret; |
| } else |
| sysfs_unmerge_group(&fs_info->super_kobj, |
| &agroup); |
| } |
| |
| } |
| return 0; |
| } |
| |
| static void __btrfs_sysfs_remove_one(struct btrfs_fs_info *fs_info) |
| { |
| kobject_del(&fs_info->super_kobj); |
| kobject_put(&fs_info->super_kobj); |
| wait_for_completion(&fs_info->kobj_unregister); |
| } |
| |
| void btrfs_sysfs_remove_one(struct btrfs_fs_info *fs_info) |
| { |
| if (fs_info->space_info_kobj) { |
| sysfs_remove_files(fs_info->space_info_kobj, allocation_attrs); |
| kobject_del(fs_info->space_info_kobj); |
| kobject_put(fs_info->space_info_kobj); |
| } |
| kobject_del(fs_info->device_dir_kobj); |
| kobject_put(fs_info->device_dir_kobj); |
| addrm_unknown_feature_attrs(fs_info, false); |
| sysfs_remove_group(&fs_info->super_kobj, &btrfs_feature_attr_group); |
| __btrfs_sysfs_remove_one(fs_info); |
| } |
| |
| const char * const btrfs_feature_set_names[3] = { |
| [FEAT_COMPAT] = "compat", |
| [FEAT_COMPAT_RO] = "compat_ro", |
| [FEAT_INCOMPAT] = "incompat", |
| }; |
| |
| char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags) |
| { |
| size_t bufsize = 4096; /* safe max, 64 names * 64 bytes */ |
| int len = 0; |
| int i; |
| char *str; |
| |
| str = kmalloc(bufsize, GFP_KERNEL); |
| if (!str) |
| return str; |
| |
| for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { |
| const char *name; |
| |
| if (!(flags & (1ULL << i))) |
| continue; |
| |
| name = btrfs_feature_attrs[set][i].kobj_attr.attr.name; |
| len += snprintf(str + len, bufsize - len, "%s%s", |
| len ? "," : "", name); |
| } |
| |
| return str; |
| } |
| |
| static void init_feature_attrs(void) |
| { |
| struct btrfs_feature_attr *fa; |
| int set, i; |
| |
| BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names) != |
| ARRAY_SIZE(btrfs_feature_attrs)); |
| BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names[0]) != |
| ARRAY_SIZE(btrfs_feature_attrs[0])); |
| |
| memset(btrfs_feature_attrs, 0, sizeof(btrfs_feature_attrs)); |
| memset(btrfs_unknown_feature_names, 0, |
| sizeof(btrfs_unknown_feature_names)); |
| |
| for (i = 0; btrfs_supported_feature_attrs[i]; i++) { |
| struct btrfs_feature_attr *sfa; |
| struct attribute *a = btrfs_supported_feature_attrs[i]; |
| int bit; |
| sfa = attr_to_btrfs_feature_attr(a); |
| bit = ilog2(sfa->feature_bit); |
| fa = &btrfs_feature_attrs[sfa->feature_set][bit]; |
| |
| fa->kobj_attr.attr.name = sfa->kobj_attr.attr.name; |
| } |
| |
| for (set = 0; set < FEAT_MAX; set++) { |
| for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { |
| char *name = btrfs_unknown_feature_names[set][i]; |
| fa = &btrfs_feature_attrs[set][i]; |
| |
| if (fa->kobj_attr.attr.name) |
| continue; |
| |
| snprintf(name, 13, "%s:%u", |
| btrfs_feature_set_names[set], i); |
| |
| fa->kobj_attr.attr.name = name; |
| fa->kobj_attr.attr.mode = S_IRUGO; |
| fa->feature_set = set; |
| fa->feature_bit = 1ULL << i; |
| } |
| } |
| } |
| |
| static int add_device_membership(struct btrfs_fs_info *fs_info) |
| { |
| int error = 0; |
| struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; |
| struct btrfs_device *dev; |
| |
| fs_info->device_dir_kobj = kobject_create_and_add("devices", |
| &fs_info->super_kobj); |
| if (!fs_info->device_dir_kobj) |
| return -ENOMEM; |
| |
| list_for_each_entry(dev, &fs_devices->devices, dev_list) { |
| struct hd_struct *disk; |
| struct kobject *disk_kobj; |
| |
| if (!dev->bdev) |
| continue; |
| |
| disk = dev->bdev->bd_part; |
| disk_kobj = &part_to_dev(disk)->kobj; |
| |
| error = sysfs_create_link(fs_info->device_dir_kobj, |
| disk_kobj, disk_kobj->name); |
| if (error) |
| break; |
| } |
| |
| return error; |
| } |
| |
| /* /sys/fs/btrfs/ entry */ |
| static struct kset *btrfs_kset; |
| |
| /* /sys/kernel/debug/btrfs */ |
| static struct dentry *btrfs_debugfs_root_dentry; |
| |
| /* Debugging tunables and exported data */ |
| u64 btrfs_debugfs_test; |
| |
| int btrfs_sysfs_add_one(struct btrfs_fs_info *fs_info) |
| { |
| int error; |
| |
| init_completion(&fs_info->kobj_unregister); |
| fs_info->super_kobj.kset = btrfs_kset; |
| error = kobject_init_and_add(&fs_info->super_kobj, &btrfs_ktype, NULL, |
| "%pU", fs_info->fsid); |
| if (error) |
| return error; |
| |
| error = sysfs_create_group(&fs_info->super_kobj, |
| &btrfs_feature_attr_group); |
| if (error) { |
| __btrfs_sysfs_remove_one(fs_info); |
| return error; |
| } |
| |
| error = addrm_unknown_feature_attrs(fs_info, true); |
| if (error) |
| goto failure; |
| |
| error = add_device_membership(fs_info); |
| if (error) |
| goto failure; |
| |
| fs_info->space_info_kobj = kobject_create_and_add("allocation", |
| &fs_info->super_kobj); |
| if (!fs_info->space_info_kobj) { |
| error = -ENOMEM; |
| goto failure; |
| } |
| |
| error = sysfs_create_files(fs_info->space_info_kobj, allocation_attrs); |
| if (error) |
| goto failure; |
| |
| return 0; |
| failure: |
| btrfs_sysfs_remove_one(fs_info); |
| return error; |
| } |
| |
| static int btrfs_init_debugfs(void) |
| { |
| #ifdef CONFIG_DEBUG_FS |
| btrfs_debugfs_root_dentry = debugfs_create_dir("btrfs", NULL); |
| if (!btrfs_debugfs_root_dentry) |
| return -ENOMEM; |
| |
| debugfs_create_u64("test", S_IRUGO | S_IWUGO, btrfs_debugfs_root_dentry, |
| &btrfs_debugfs_test); |
| #endif |
| return 0; |
| } |
| |
| int btrfs_init_sysfs(void) |
| { |
| int ret; |
| |
| btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj); |
| if (!btrfs_kset) |
| return -ENOMEM; |
| |
| ret = btrfs_init_debugfs(); |
| if (ret) |
| return ret; |
| |
| init_feature_attrs(); |
| ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); |
| |
| return ret; |
| } |
| |
| void btrfs_exit_sysfs(void) |
| { |
| sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); |
| kset_unregister(btrfs_kset); |
| debugfs_remove_recursive(btrfs_debugfs_root_dentry); |
| } |
| |