--- /dev/null
+/*
+ * 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);
+ 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);
+
+ 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);
+
+ /*
+ * 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);
+
+ 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, 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, global_rsv_reserved_show);
+
+#define to_space_info(_kobj) container_of(_kobj, struct btrfs_space_info, kobj)
+#define to_raid_kobj(_kobj) container_of(_kobj, struct raid_kobject, 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 = to_raid_kobj(kobj)->raid_type;
+ 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)
+{
+ kfree(to_raid_kobj(kobj));
+}
+
+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, 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, 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);
+ char *label = fs_info->super_copy->label;
+ return snprintf(buf, PAGE_SIZE, label[0] ? "%s\n" : "%s", 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);
+ size_t p_len;
+
+ if (fs_info->sb->s_flags & MS_RDONLY)
+ return -EROFS;
+
+ /*
+ * p_len is the len until the first occurrence of either
+ * '\n' or '\0'
+ */
+ p_len = strcspn(buf, "\n");
+
+ if (p_len >= BTRFS_LABEL_SIZE)
+ return -EINVAL;
+
+ spin_lock(&fs_info->super_lock);
+ memset(fs_info->super_copy->label, 0, BTRFS_LABEL_SIZE);
+ memcpy(fs_info->super_copy->label, buf, p_len);
+ spin_unlock(&fs_info->super_lock);
+
+ /*
+ * 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);
+
+ return len;
+}
+BTRFS_ATTR_RW(label, btrfs_label_show, btrfs_label_store);
+
+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(nodesize, btrfs_nodesize_show);
+
+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(sectorsize, btrfs_sectorsize_show);
+
+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(clone_alignment, btrfs_clone_alignment_show);
+
+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 const 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;
+ }
+ }
+}
+
+int btrfs_kobj_rm_device(struct btrfs_fs_info *fs_info,
+ struct btrfs_device *one_device)
+{
+ struct hd_struct *disk;
+ struct kobject *disk_kobj;
+
+ if (!fs_info->device_dir_kobj)
+ return -EINVAL;
+
+ if (one_device && one_device->bdev) {
+ disk = one_device->bdev->bd_part;
+ disk_kobj = &part_to_dev(disk)->kobj;
+
+ sysfs_remove_link(fs_info->device_dir_kobj,
+ disk_kobj->name);
+ }
+
+ return 0;
+}
+
+int btrfs_kobj_add_device(struct btrfs_fs_info *fs_info,
+ struct btrfs_device *one_device)
+{
+ int error = 0;
+ struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
+ struct btrfs_device *dev;
+
+ if (!fs_info->device_dir_kobj)
+ 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;
+
+ if (one_device && one_device != dev)
+ 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 = btrfs_kobj_add_device(fs_info, NULL);
+ 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)
+ goto out1;
+
+ init_feature_attrs();
+ ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_feature_attr_group);
+ if (ret)
+ goto out2;
+
+ return 0;
+out2:
+ debugfs_remove_recursive(btrfs_debugfs_root_dentry);
+out1:
+ kset_unregister(btrfs_kset);
+
+ 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);
+}
+
Code Review / kvmfornfv.git / blobdiff