2 * Copyright (C) 2007 Oracle. All rights reserved.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
19 #include <linux/sched.h>
20 #include <linux/slab.h>
21 #include <linux/spinlock.h>
22 #include <linux/completion.h>
23 #include <linux/buffer_head.h>
24 #include <linux/kobject.h>
28 #include "transaction.h"
31 static void btrfs_release_super_kobj(struct kobject *kobj);
32 static struct kobj_type btrfs_ktype = {
33 .sysfs_ops = &kobj_sysfs_ops,
34 .release = btrfs_release_super_kobj,
37 static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj)
39 if (kobj->ktype != &btrfs_ktype)
41 return container_of(kobj, struct btrfs_fs_info, super_kobj);
44 static void btrfs_release_super_kobj(struct kobject *kobj)
46 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
47 complete(&fs_info->kobj_unregister);
50 static ssize_t btrfs_feature_attr_show(struct kobject *kobj,
51 struct kobj_attribute *a, char *buf)
53 return snprintf(buf, PAGE_SIZE, "0\n");
56 BTRFS_FEAT_ATTR_INCOMPAT(mixed_backref, MIXED_BACKREF);
57 BTRFS_FEAT_ATTR_INCOMPAT(default_subvol, DEFAULT_SUBVOL);
58 BTRFS_FEAT_ATTR_INCOMPAT(mixed_groups, MIXED_GROUPS);
59 BTRFS_FEAT_ATTR_INCOMPAT(compress_lzo, COMPRESS_LZO);
60 BTRFS_FEAT_ATTR_INCOMPAT(compress_lzov2, COMPRESS_LZOv2);
61 BTRFS_FEAT_ATTR_INCOMPAT(big_metadata, BIG_METADATA);
62 BTRFS_FEAT_ATTR_INCOMPAT(extended_iref, EXTENDED_IREF);
63 BTRFS_FEAT_ATTR_INCOMPAT(raid56, RAID56);
64 BTRFS_FEAT_ATTR_INCOMPAT(skinny_metadata, SKINNY_METADATA);
66 static struct attribute *btrfs_supported_feature_attrs[] = {
67 BTRFS_FEAT_ATTR_PTR(mixed_backref),
68 BTRFS_FEAT_ATTR_PTR(default_subvol),
69 BTRFS_FEAT_ATTR_PTR(mixed_groups),
70 BTRFS_FEAT_ATTR_PTR(compress_lzo),
71 BTRFS_FEAT_ATTR_PTR(compress_lzov2),
72 BTRFS_FEAT_ATTR_PTR(big_metadata),
73 BTRFS_FEAT_ATTR_PTR(extended_iref),
74 BTRFS_FEAT_ATTR_PTR(raid56),
75 BTRFS_FEAT_ATTR_PTR(skinny_metadata),
79 static const struct attribute_group btrfs_feature_attr_group = {
81 .attrs = btrfs_supported_feature_attrs,
84 /* /sys/fs/btrfs/ entry */
85 static struct kset *btrfs_kset;
87 void btrfs_sysfs_remove_one(struct btrfs_fs_info *fs_info)
89 kobject_del(&fs_info->super_kobj);
90 kobject_put(&fs_info->super_kobj);
91 wait_for_completion(&fs_info->kobj_unregister);
94 int btrfs_sysfs_add_one(struct btrfs_fs_info *fs_info)
98 init_completion(&fs_info->kobj_unregister);
99 error = kobject_init_and_add(&fs_info->super_kobj, &btrfs_ktype, NULL,
100 "%pU", fs_info->fsid);
104 int btrfs_init_sysfs(void)
107 btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj);
111 ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_feature_attr_group);
113 kset_unregister(btrfs_kset);
120 void btrfs_exit_sysfs(void)
122 sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group);
123 kset_unregister(btrfs_kset);