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[mirror_ubuntu-bionic-kernel.git] / 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
22 int 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
43 int 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 < 0)
60 goto out;
61 if (ret) { /* JDM: Really? */
62 ret = -ENOENT;
63 goto out;
64 }
65
66 ret = btrfs_del_item(trans, root, path);
67
68 out:
69 btrfs_free_path(path);
70 return ret;
71 }
72
73 int btrfs_find_orphan_item(struct btrfs_root *root, u64 offset)
74 {
75 struct btrfs_path *path;
76 struct btrfs_key key;
77 int ret;
78
79 key.objectid = BTRFS_ORPHAN_OBJECTID;
80 key.type = BTRFS_ORPHAN_ITEM_KEY;
81 key.offset = offset;
82
83 path = btrfs_alloc_path();
84 if (!path)
85 return -ENOMEM;
86
87 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
88
89 btrfs_free_path(path);
90 return ret;
91 }