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6cbd5570 CM |
1 | /* |
2 | * Copyright (C) 2007 Oracle. 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 | ||
9f5fae2f CM |
19 | #include "ctree.h" |
20 | #include "disk-io.h" | |
21 | #include "transaction.h" | |
22 | ||
1b05da2e | 23 | int btrfs_find_highest_inode(struct btrfs_root *root, u64 *objectid) |
5be6f7f1 CM |
24 | { |
25 | struct btrfs_path *path; | |
26 | int ret; | |
5f39d397 | 27 | struct extent_buffer *l; |
5be6f7f1 | 28 | struct btrfs_key search_key; |
5f39d397 | 29 | struct btrfs_key found_key; |
5be6f7f1 CM |
30 | int slot; |
31 | ||
32 | path = btrfs_alloc_path(); | |
33 | BUG_ON(!path); | |
34 | ||
35 | search_key.objectid = (u64)-1; | |
36 | search_key.offset = (u64)-1; | |
37 | ret = btrfs_search_slot(NULL, root, &search_key, path, 0, 0); | |
38 | if (ret < 0) | |
39 | goto error; | |
40 | BUG_ON(ret == 0); | |
41 | if (path->slots[0] > 0) { | |
42 | slot = path->slots[0] - 1; | |
5f39d397 CM |
43 | l = path->nodes[0]; |
44 | btrfs_item_key_to_cpu(l, &found_key, slot); | |
45 | *objectid = found_key.objectid; | |
5be6f7f1 CM |
46 | } else { |
47 | *objectid = BTRFS_FIRST_FREE_OBJECTID; | |
48 | } | |
49 | ret = 0; | |
50 | error: | |
51 | btrfs_free_path(path); | |
52 | return ret; | |
53 | } | |
54 | ||
9f5fae2f CM |
55 | /* |
56 | * walks the btree of allocated inodes and find a hole. | |
57 | */ | |
58 | int btrfs_find_free_objectid(struct btrfs_trans_handle *trans, | |
1b05da2e | 59 | struct btrfs_root *root, |
9f5fae2f CM |
60 | u64 dirid, u64 *objectid) |
61 | { | |
7cfcc17e | 62 | struct btrfs_path *path; |
9f5fae2f CM |
63 | struct btrfs_key key; |
64 | int ret; | |
65 | u64 hole_size = 0; | |
66 | int slot = 0; | |
e20d96d6 | 67 | u64 last_ino = 0; |
9f5fae2f | 68 | int start_found; |
5f39d397 | 69 | struct extent_buffer *l; |
9f5fae2f CM |
70 | struct btrfs_key search_key; |
71 | u64 search_start = dirid; | |
72 | ||
b1a4d965 CM |
73 | path = btrfs_alloc_path(); |
74 | BUG_ON(!path); | |
1b05da2e | 75 | search_start = root->last_inode_alloc; |
6407bf6d | 76 | search_start = max(search_start, BTRFS_FIRST_FREE_OBJECTID); |
9f5fae2f | 77 | search_key.objectid = search_start; |
9f5fae2f CM |
78 | search_key.offset = 0; |
79 | ||
7cfcc17e | 80 | btrfs_init_path(path); |
9f5fae2f | 81 | start_found = 0; |
7cfcc17e | 82 | ret = btrfs_search_slot(trans, root, &search_key, path, 0, 0); |
9f5fae2f CM |
83 | if (ret < 0) |
84 | goto error; | |
85 | ||
7cfcc17e CM |
86 | if (path->slots[0] > 0) |
87 | path->slots[0]--; | |
9f5fae2f CM |
88 | |
89 | while (1) { | |
5f39d397 | 90 | l = path->nodes[0]; |
7cfcc17e | 91 | slot = path->slots[0]; |
5f39d397 | 92 | if (slot >= btrfs_header_nritems(l)) { |
7cfcc17e | 93 | ret = btrfs_next_leaf(root, path); |
9f5fae2f CM |
94 | if (ret == 0) |
95 | continue; | |
96 | if (ret < 0) | |
97 | goto error; | |
98 | if (!start_found) { | |
99 | *objectid = search_start; | |
100 | start_found = 1; | |
101 | goto found; | |
102 | } | |
103 | *objectid = last_ino > search_start ? | |
104 | last_ino : search_start; | |
105 | goto found; | |
106 | } | |
5f39d397 | 107 | btrfs_item_key_to_cpu(l, &key, slot); |
9f5fae2f CM |
108 | if (key.objectid >= search_start) { |
109 | if (start_found) { | |
110 | if (last_ino < search_start) | |
111 | last_ino = search_start; | |
112 | hole_size = key.objectid - last_ino; | |
113 | if (hole_size > 0) { | |
114 | *objectid = last_ino; | |
115 | goto found; | |
116 | } | |
117 | } | |
118 | } | |
119 | start_found = 1; | |
120 | last_ino = key.objectid + 1; | |
7cfcc17e | 121 | path->slots[0]++; |
9f5fae2f CM |
122 | } |
123 | // FIXME -ENOSPC | |
124 | found: | |
1b05da2e | 125 | root->last_inode_alloc = *objectid; |
7cfcc17e CM |
126 | btrfs_release_path(root, path); |
127 | btrfs_free_path(path); | |
9f5fae2f CM |
128 | BUG_ON(*objectid < search_start); |
129 | return 0; | |
130 | error: | |
7cfcc17e CM |
131 | btrfs_release_path(root, path); |
132 | btrfs_free_path(path); | |
9f5fae2f CM |
133 | return ret; |
134 | } |