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 ssize_t btrfs_feature_attr_show(struct kobject *kobj,
32 struct kobj_attribute *a, char *buf)
34 return snprintf(buf, PAGE_SIZE, "0\n");
37 BTRFS_FEAT_ATTR_INCOMPAT(mixed_backref, MIXED_BACKREF);
38 BTRFS_FEAT_ATTR_INCOMPAT(default_subvol, DEFAULT_SUBVOL);
39 BTRFS_FEAT_ATTR_INCOMPAT(mixed_groups, MIXED_GROUPS);
40 BTRFS_FEAT_ATTR_INCOMPAT(compress_lzo, COMPRESS_LZO);
41 BTRFS_FEAT_ATTR_INCOMPAT(compress_lzov2, COMPRESS_LZOv2);
42 BTRFS_FEAT_ATTR_INCOMPAT(big_metadata, BIG_METADATA);
43 BTRFS_FEAT_ATTR_INCOMPAT(extended_iref, EXTENDED_IREF);
44 BTRFS_FEAT_ATTR_INCOMPAT(raid56, RAID56);
45 BTRFS_FEAT_ATTR_INCOMPAT(skinny_metadata, SKINNY_METADATA);
47 static struct attribute *btrfs_supported_feature_attrs[] = {
48 BTRFS_FEAT_ATTR_PTR(mixed_backref),
49 BTRFS_FEAT_ATTR_PTR(default_subvol),
50 BTRFS_FEAT_ATTR_PTR(mixed_groups),
51 BTRFS_FEAT_ATTR_PTR(compress_lzo),
52 BTRFS_FEAT_ATTR_PTR(compress_lzov2),
53 BTRFS_FEAT_ATTR_PTR(big_metadata),
54 BTRFS_FEAT_ATTR_PTR(extended_iref),
55 BTRFS_FEAT_ATTR_PTR(raid56),
56 BTRFS_FEAT_ATTR_PTR(skinny_metadata),
60 static const struct attribute_group btrfs_feature_attr_group = {
62 .attrs = btrfs_supported_feature_attrs,
65 /* /sys/fs/btrfs/ entry */
66 static struct kset *btrfs_kset;
68 int btrfs_init_sysfs(void)
71 btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj);
75 ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_feature_attr_group);
77 kset_unregister(btrfs_kset);
84 void btrfs_exit_sysfs(void)
86 sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group);
87 kset_unregister(btrfs_kset);