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fs/btrfs/sysfs.c
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/* * 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. */ |
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#include <linux/sched.h> #include <linux/slab.h> #include <linux/spinlock.h> #include <linux/completion.h> #include <linux/buffer_head.h> |
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#include <linux/kobject.h> |
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#include <linux/bug.h> |
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#include <linux/genhd.h> |
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#include <linux/debugfs.h> |
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#include "ctree.h" #include "disk-io.h" #include "transaction.h" |
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#include "sysfs.h" |
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#include "volumes.h" |
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static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj); |
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static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj); |
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static u64 get_features(struct btrfs_fs_info *fs_info, enum btrfs_feature_set set) |
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{ |
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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); |
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} |
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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: |
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printk(KERN_WARNING "btrfs: sysfs: unknown feature set %d ", fa->feature_set); return 0; |
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} if (set & fa->feature_bit) val |= 1; if (clear & fa->feature_bit) val |= 2; return val; } |
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static ssize_t btrfs_feature_attr_show(struct kobject *kobj, struct kobj_attribute *a, char *buf) |
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{ |
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int val = 0; |
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struct btrfs_fs_info *fs_info = to_fs_info(kobj); |
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struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a); |
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if (fs_info) { |
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u64 features = get_features(fs_info, fa->feature_set); if (features & fa->feature_bit) val = 1; |
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} else val = can_modify_feature(fa); |
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return snprintf(buf, PAGE_SIZE, "%d ", val); |
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} |
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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); |
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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); |
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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); |
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/* * We don't want to do full transaction commit from inside sysfs */ btrfs_set_pending(fs_info, COMMIT); wake_up_process(fs_info->transaction_kthread); |
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return count; } |
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static umode_t btrfs_feature_visible(struct kobject *kobj, struct attribute *attr, int unused) |
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{ |
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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); |
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if (can_modify_feature(fa)) mode |= S_IWUSR; else if (!(features & fa->feature_bit)) |
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mode = 0; } return mode; |
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} 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); |
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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); |
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BTRFS_FEAT_ATTR_INCOMPAT(no_holes, NO_HOLES); |
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BTRFS_FEAT_ATTR_COMPAT_RO(free_space_tree, FREE_SPACE_TREE); |
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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), |
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BTRFS_FEAT_ATTR_PTR(big_metadata), BTRFS_FEAT_ATTR_PTR(extended_iref), BTRFS_FEAT_ATTR_PTR(raid56), BTRFS_FEAT_ATTR_PTR(skinny_metadata), |
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BTRFS_FEAT_ATTR_PTR(no_holes), |
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BTRFS_FEAT_ATTR_PTR(free_space_tree), |
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NULL }; static const struct attribute_group btrfs_feature_attr_group = { .name = "features", |
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.is_visible = btrfs_feature_visible, |
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.attrs = btrfs_supported_feature_attrs, }; |
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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 ", 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); } |
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BTRFS_ATTR(global_rsv_size, global_rsv_size_show); |
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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); } |
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BTRFS_ATTR(global_rsv_reserved, global_rsv_reserved_show); |
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#define to_space_info(_kobj) container_of(_kobj, struct btrfs_space_info, kobj) |
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#define to_raid_kobj(_kobj) container_of(_kobj, struct raid_kobject, kobj) |
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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; |
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int index = to_raid_kobj(kobj)->raid_type; |
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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 ", 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) { |
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kfree(to_raid_kobj(kobj)); |
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} 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); \ } \ |
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BTRFS_ATTR(field, btrfs_space_info_show_##field) |
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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 ", 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); |
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BTRFS_ATTR(total_bytes_pinned, btrfs_space_info_show_total_bytes_pinned); |
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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, }; |
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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); |
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char *label = fs_info->super_copy->label; return snprintf(buf, PAGE_SIZE, label[0] ? "%s " : "%s", label); |
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} 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); |
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size_t p_len; |
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if (fs_info->sb->s_flags & MS_RDONLY) return -EROFS; |
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/* * p_len is the len until the first occurrence of either * ' ' or '\0' */ p_len = strcspn(buf, " "); if (p_len >= BTRFS_LABEL_SIZE) |
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return -EINVAL; |
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spin_lock(&fs_info->super_lock); |
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memset(fs_info->super_copy->label, 0, BTRFS_LABEL_SIZE); memcpy(fs_info->super_copy->label, buf, p_len); |
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spin_unlock(&fs_info->super_lock); |
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/* * We don't want to do full transaction commit from inside sysfs */ btrfs_set_pending(fs_info, COMMIT); wake_up_process(fs_info->transaction_kthread); |
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return len; |
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} |
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BTRFS_ATTR_RW(label, btrfs_label_show, btrfs_label_store); |
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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 ", fs_info->super_copy->nodesize); } |
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BTRFS_ATTR(nodesize, btrfs_nodesize_show); |
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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 ", fs_info->super_copy->sectorsize); } |
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BTRFS_ATTR(sectorsize, btrfs_sectorsize_show); |
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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 ", fs_info->super_copy->sectorsize); } |
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BTRFS_ATTR(clone_alignment, btrfs_clone_alignment_show); |
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static const struct attribute *btrfs_attrs[] = { |
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BTRFS_ATTR_PTR(label), |
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BTRFS_ATTR_PTR(nodesize), BTRFS_ATTR_PTR(sectorsize), BTRFS_ATTR_PTR(clone_alignment), |
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NULL, }; |
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static void btrfs_release_fsid_kobj(struct kobject *kobj) |
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{ |
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struct btrfs_fs_devices *fs_devs = to_fs_devs(kobj); |
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memset(&fs_devs->fsid_kobj, 0, sizeof(struct kobject)); |
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complete(&fs_devs->kobj_unregister); |
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} static struct kobj_type btrfs_ktype = { .sysfs_ops = &kobj_sysfs_ops, |
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.release = btrfs_release_fsid_kobj, |
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}; |
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static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj) { if (kobj->ktype != &btrfs_ktype) return NULL; |
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return container_of(kobj, struct btrfs_fs_devices, fsid_kobj); |
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} |
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static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj) { if (kobj->ktype != &btrfs_ktype) return NULL; |
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return to_fs_devs(kobj)->fs_info; |
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} |
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#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]; |
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static const u64 supported_feature_masks[3] = { |
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[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; |
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ret = sysfs_merge_group(&fs_info->fs_devices->fsid_kobj, |
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&agroup); if (ret) return ret; } else |
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sysfs_unmerge_group(&fs_info->fs_devices->fsid_kobj, |
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&agroup); } } return 0; } |
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static void __btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs) |
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{ |
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if (fs_devs->device_dir_kobj) { kobject_del(fs_devs->device_dir_kobj); kobject_put(fs_devs->device_dir_kobj); fs_devs->device_dir_kobj = NULL; |
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} |
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if (fs_devs->fsid_kobj.state_initialized) { kobject_del(&fs_devs->fsid_kobj); kobject_put(&fs_devs->fsid_kobj); |
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wait_for_completion(&fs_devs->kobj_unregister); } |
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} |
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/* when fs_devs is NULL it will remove all fsid kobject */ |
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void btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs) |
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{ struct list_head *fs_uuids = btrfs_get_fs_uuids(); if (fs_devs) { __btrfs_sysfs_remove_fsid(fs_devs); return; } list_for_each_entry(fs_devs, fs_uuids, list) { __btrfs_sysfs_remove_fsid(fs_devs); } } |
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void btrfs_sysfs_remove_mounted(struct btrfs_fs_info *fs_info) |
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{ |
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btrfs_reset_fs_info_ptr(fs_info); |
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543 544 545 546 547 |
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); } |
e453d989e
|
548 |
addrm_unknown_feature_attrs(fs_info, false); |
c1b7e4745
|
549 550 |
sysfs_remove_group(&fs_info->fs_devices->fsid_kobj, &btrfs_feature_attr_group); sysfs_remove_files(&fs_info->fs_devices->fsid_kobj, btrfs_attrs); |
325760404
|
551 |
btrfs_sysfs_rm_device_link(fs_info->fs_devices, NULL); |
e453d989e
|
552 |
} |
79da4fa4d
|
553 554 555 556 557 |
const char * const btrfs_feature_set_names[3] = { [FEAT_COMPAT] = "compat", [FEAT_COMPAT_RO] = "compat_ro", [FEAT_INCOMPAT] = "incompat", }; |
3b02a68a6
|
558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 |
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; } |
79da4fa4d
|
582 583 584 585 586 587 588 589 590 |
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])); |
3b02a68a6
|
591 592 593 |
memset(btrfs_feature_attrs, 0, sizeof(btrfs_feature_attrs)); memset(btrfs_unknown_feature_names, 0, sizeof(btrfs_unknown_feature_names)); |
79da4fa4d
|
594 595 596 |
for (i = 0; btrfs_supported_feature_attrs[i]; i++) { struct btrfs_feature_attr *sfa; struct attribute *a = btrfs_supported_feature_attrs[i]; |
3b02a68a6
|
597 |
int bit; |
79da4fa4d
|
598 |
sfa = attr_to_btrfs_feature_attr(a); |
3b02a68a6
|
599 600 |
bit = ilog2(sfa->feature_bit); fa = &btrfs_feature_attrs[sfa->feature_set][bit]; |
79da4fa4d
|
601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 |
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; } } } |
e7e1aa9c9
|
623 |
/* when one_device is NULL, it removes all device links */ |
325760404
|
624 |
int btrfs_sysfs_rm_device_link(struct btrfs_fs_devices *fs_devices, |
99994cde9
|
625 626 627 628 |
struct btrfs_device *one_device) { struct hd_struct *disk; struct kobject *disk_kobj; |
6c14a1641
|
629 |
if (!fs_devices->device_dir_kobj) |
99994cde9
|
630 |
return -EINVAL; |
87fa3bb07
|
631 |
if (one_device && one_device->bdev) { |
99994cde9
|
632 633 |
disk = one_device->bdev->bd_part; disk_kobj = &part_to_dev(disk)->kobj; |
6c14a1641
|
634 |
sysfs_remove_link(fs_devices->device_dir_kobj, |
99994cde9
|
635 636 |
disk_kobj->name); } |
e7e1aa9c9
|
637 638 639 640 |
if (one_device) return 0; list_for_each_entry(one_device, |
6c14a1641
|
641 |
&fs_devices->devices, dev_list) { |
e7e1aa9c9
|
642 643 644 645 |
if (!one_device->bdev) continue; disk = one_device->bdev->bd_part; disk_kobj = &part_to_dev(disk)->kobj; |
6c14a1641
|
646 |
sysfs_remove_link(fs_devices->device_dir_kobj, |
e7e1aa9c9
|
647 648 |
disk_kobj->name); } |
99994cde9
|
649 650 |
return 0; } |
2e7910d6c
|
651 |
int btrfs_sysfs_add_device(struct btrfs_fs_devices *fs_devs) |
29e5be240
|
652 |
{ |
2e7910d6c
|
653 654 |
if (!fs_devs->device_dir_kobj) fs_devs->device_dir_kobj = kobject_create_and_add("devices", |
c1b7e4745
|
655 |
&fs_devs->fsid_kobj); |
0d39376aa
|
656 |
|
2e7910d6c
|
657 |
if (!fs_devs->device_dir_kobj) |
29e5be240
|
658 |
return -ENOMEM; |
00c921c23
|
659 660 |
return 0; } |
e3bd6973b
|
661 |
int btrfs_sysfs_add_device_link(struct btrfs_fs_devices *fs_devices, |
1ba43816a
|
662 |
struct btrfs_device *one_device) |
00c921c23
|
663 664 |
{ int error = 0; |
00c921c23
|
665 |
struct btrfs_device *dev; |
29e5be240
|
666 |
list_for_each_entry(dev, &fs_devices->devices, dev_list) { |
f085381e6
|
667 668 669 670 671 |
struct hd_struct *disk; struct kobject *disk_kobj; if (!dev->bdev) continue; |
0d39376aa
|
672 673 |
if (one_device && one_device != dev) continue; |
f085381e6
|
674 675 |
disk = dev->bdev->bd_part; disk_kobj = &part_to_dev(disk)->kobj; |
29e5be240
|
676 |
|
2e7910d6c
|
677 |
error = sysfs_create_link(fs_devices->device_dir_kobj, |
29e5be240
|
678 679 680 681 682 683 684 |
disk_kobj, disk_kobj->name); if (error) break; } return error; } |
510d73600
|
685 686 |
/* /sys/fs/btrfs/ entry */ static struct kset *btrfs_kset; |
1bae30982
|
687 688 689 690 691 |
/* /sys/kernel/debug/btrfs */ static struct dentry *btrfs_debugfs_root_dentry; /* Debugging tunables and exported data */ u64 btrfs_debugfs_test; |
720592157
|
692 693 694 695 |
/* * Can be called by the device discovery thread. * And parent can be specified for seed device */ |
0c10e2d48
|
696 |
int btrfs_sysfs_add_fsid(struct btrfs_fs_devices *fs_devs, |
720592157
|
697 |
struct kobject *parent) |
5ac1d209f
|
698 699 |
{ int error; |
2e7910d6c
|
700 |
init_completion(&fs_devs->kobj_unregister); |
c1b7e4745
|
701 702 |
fs_devs->fsid_kobj.kset = btrfs_kset; error = kobject_init_and_add(&fs_devs->fsid_kobj, |
24bd69cb0
|
703 |
&btrfs_ktype, parent, "%pU", fs_devs->fsid); |
720592157
|
704 705 |
return error; } |
96f3136e5
|
706 |
int btrfs_sysfs_add_mounted(struct btrfs_fs_info *fs_info) |
720592157
|
707 708 |
{ int error; |
2e7910d6c
|
709 |
struct btrfs_fs_devices *fs_devs = fs_info->fs_devices; |
c1b7e4745
|
710 |
struct kobject *fsid_kobj = &fs_devs->fsid_kobj; |
720592157
|
711 |
|
5a13f4308
|
712 |
btrfs_set_fs_info_ptr(fs_info); |
e3bd6973b
|
713 |
error = btrfs_sysfs_add_device_link(fs_devs, NULL); |
b7c35e81a
|
714 |
if (error) |
aaf133051
|
715 |
return error; |
aaf133051
|
716 |
|
c1b7e4745
|
717 |
error = sysfs_create_files(fsid_kobj, btrfs_attrs); |
e453d989e
|
718 |
if (error) { |
325760404
|
719 |
btrfs_sysfs_rm_device_link(fs_devs, NULL); |
e453d989e
|
720 721 |
return error; } |
79da4fa4d
|
722 |
|
c1b7e4745
|
723 |
error = sysfs_create_group(fsid_kobj, |
0dd2906f7
|
724 725 726 |
&btrfs_feature_attr_group); if (error) goto failure; |
e453d989e
|
727 |
error = addrm_unknown_feature_attrs(fs_info, true); |
79da4fa4d
|
728 729 |
if (error) goto failure; |
6ab0a2029
|
730 |
fs_info->space_info_kobj = kobject_create_and_add("allocation", |
c1b7e4745
|
731 |
fsid_kobj); |
6ab0a2029
|
732 733 734 735 736 737 738 739 |
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; |
79da4fa4d
|
740 741 |
return 0; failure: |
6618a59bf
|
742 |
btrfs_sysfs_remove_mounted(fs_info); |
5ac1d209f
|
743 744 |
return error; } |
444e75169
|
745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 |
/* * Change per-fs features in /sys/fs/btrfs/UUID/features to match current * values in superblock. Call after any changes to incompat/compat_ro flags */ void btrfs_sysfs_feature_update(struct btrfs_fs_info *fs_info, u64 bit, enum btrfs_feature_set set) { struct btrfs_fs_devices *fs_devs; struct kobject *fsid_kobj; u64 features; int ret; if (!fs_info) return; features = get_features(fs_info, set); ASSERT(bit & supported_feature_masks[set]); fs_devs = fs_info->fs_devices; fsid_kobj = &fs_devs->fsid_kobj; |
bf6092066
|
766 767 |
if (!fsid_kobj->state_initialized) return; |
444e75169
|
768 769 770 771 772 773 774 |
/* * FIXME: this is too heavy to update just one value, ideally we'd like * to use sysfs_update_group but some refactoring is needed first. */ sysfs_remove_group(fsid_kobj, &btrfs_feature_attr_group); ret = sysfs_create_group(fsid_kobj, &btrfs_feature_attr_group); } |
1bae30982
|
775 776 777 778 779 780 781 782 783 784 785 786 |
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; } |
b214107ed
|
787 |
int btrfs_init_sysfs(void) |
58176a960
|
788 |
{ |
079b72bca
|
789 |
int ret; |
1bae30982
|
790 |
|
e3fe4e712
|
791 792 793 |
btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj); if (!btrfs_kset) return -ENOMEM; |
079b72bca
|
794 |
|
1bae30982
|
795 796 |
ret = btrfs_init_debugfs(); if (ret) |
001a648df
|
797 |
goto out1; |
79da4fa4d
|
798 |
|
1bae30982
|
799 |
init_feature_attrs(); |
079b72bca
|
800 |
ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); |
001a648df
|
801 802 803 804 805 806 807 808 |
if (ret) goto out2; return 0; out2: debugfs_remove_recursive(btrfs_debugfs_root_dentry); out1: kset_unregister(btrfs_kset); |
079b72bca
|
809 |
|
1bae30982
|
810 |
return ret; |
58176a960
|
811 |
} |
b214107ed
|
812 |
void btrfs_exit_sysfs(void) |
58176a960
|
813 |
{ |
079b72bca
|
814 |
sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); |
e3fe4e712
|
815 |
kset_unregister(btrfs_kset); |
1bae30982
|
816 |
debugfs_remove_recursive(btrfs_debugfs_root_dentry); |
58176a960
|
817 |
} |
55d474148
|
818 |