Root/fs/btrfs/orphan.c

1/*
2 * Copyright (C) 2008 Red Hat. All rights reserved.
3 *
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.
7 *
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.
12 *
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.
17 */
18
19#include "ctree.h"
20#include "disk-io.h"
21
22int btrfs_insert_orphan_item(struct btrfs_trans_handle *trans,
23                 struct btrfs_root *root, u64 offset)
24{
25    struct btrfs_path *path;
26    struct btrfs_key key;
27    int ret = 0;
28
29    key.objectid = BTRFS_ORPHAN_OBJECTID;
30    btrfs_set_key_type(&key, BTRFS_ORPHAN_ITEM_KEY);
31    key.offset = offset;
32
33    path = btrfs_alloc_path();
34    if (!path)
35        return -ENOMEM;
36
37    ret = btrfs_insert_empty_item(trans, root, path, &key, 0);
38
39    btrfs_free_path(path);
40    return ret;
41}
42
43int btrfs_del_orphan_item(struct btrfs_trans_handle *trans,
44              struct btrfs_root *root, u64 offset)
45{
46    struct btrfs_path *path;
47    struct btrfs_key key;
48    int ret = 0;
49
50    key.objectid = BTRFS_ORPHAN_OBJECTID;
51    btrfs_set_key_type(&key, BTRFS_ORPHAN_ITEM_KEY);
52    key.offset = offset;
53
54    path = btrfs_alloc_path();
55    if (!path)
56        return -ENOMEM;
57
58    ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
59    if (ret)
60        goto out;
61
62    ret = btrfs_del_item(trans, root, path);
63
64out:
65    btrfs_free_path(path);
66    return ret;
67}
68
69int btrfs_find_orphan_item(struct btrfs_root *root, u64 offset)
70{
71    struct btrfs_path *path;
72    struct btrfs_key key;
73    int ret;
74
75    key.objectid = BTRFS_ORPHAN_OBJECTID;
76    key.type = BTRFS_ORPHAN_ITEM_KEY;
77    key.offset = offset;
78
79    path = btrfs_alloc_path();
80    if (!path)
81        return -ENOMEM;
82
83    ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
84
85    btrfs_free_path(path);
86    return ret;
87}
88

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