blob: 91d1d89d5ff8be4a79f28896cfea78a782e1361d
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * irel.h |
4 | * |
5 | * Copyright (C) 1996, 1997 Theodore Ts'o. |
6 | * |
7 | * %Begin-Header% |
8 | * This file may be redistributed under the terms of the GNU Public |
9 | * License. |
10 | * %End-Header% |
11 | */ |
12 | |
13 | struct ext2_inode_reference { |
14 | blk_t block; |
15 | __u16 offset; |
16 | }; |
17 | |
18 | struct ext2_inode_relocate_entry { |
19 | ext2_ino_t new; |
20 | ext2_ino_t orig; |
21 | __u16 flags; |
22 | __u16 max_refs; |
23 | }; |
24 | |
25 | typedef struct ext2_inode_relocation_table *ext2_irel; |
26 | |
27 | struct ext2_inode_relocation_table { |
28 | __u32 magic; |
29 | char *name; |
30 | ext2_ino_t current; |
31 | void *priv_data; |
32 | |
33 | /* |
34 | * Add an inode relocation entry. |
35 | */ |
36 | errcode_t (*put)(ext2_irel irel, ext2_ino_t old, |
37 | struct ext2_inode_relocate_entry *ent); |
38 | /* |
39 | * Get an inode relocation entry. |
40 | */ |
41 | errcode_t (*get)(ext2_irel irel, ext2_ino_t old, |
42 | struct ext2_inode_relocate_entry *ent); |
43 | |
44 | /* |
45 | * Get an inode relocation entry by its original inode number |
46 | */ |
47 | errcode_t (*get_by_orig)(ext2_irel irel, ext2_ino_t orig, ext2_ino_t *old, |
48 | struct ext2_inode_relocate_entry *ent); |
49 | |
50 | /* |
51 | * Initialize for iterating over the inode relocation entries. |
52 | */ |
53 | errcode_t (*start_iter)(ext2_irel irel); |
54 | |
55 | /* |
56 | * The iterator function for the inode relocation entries. |
57 | * Returns an inode number of 0 when out of entries. |
58 | */ |
59 | errcode_t (*next)(ext2_irel irel, ext2_ino_t *old, |
60 | struct ext2_inode_relocate_entry *ent); |
61 | |
62 | /* |
63 | * Add an inode reference (i.e., note the fact that a |
64 | * particular block/offset contains a reference to an inode) |
65 | */ |
66 | errcode_t (*add_ref)(ext2_irel irel, ext2_ino_t ino, |
67 | struct ext2_inode_reference *ref); |
68 | |
69 | /* |
70 | * Initialize for iterating over the inode references for a |
71 | * particular inode. |
72 | */ |
73 | errcode_t (*start_iter_ref)(ext2_irel irel, ext2_ino_t ino); |
74 | |
75 | /* |
76 | * The iterator function for the inode references for an |
77 | * inode. The references for only one inode can be interator |
78 | * over at a time, as the iterator state is stored in ext2_irel. |
79 | */ |
80 | errcode_t (*next_ref)(ext2_irel irel, |
81 | struct ext2_inode_reference *ref); |
82 | |
83 | /* |
84 | * Move the inode relocation table from one inode number to |
85 | * another. Note that the inode references also must move. |
86 | */ |
87 | errcode_t (*move)(ext2_irel irel, ext2_ino_t old, ext2_ino_t new); |
88 | |
89 | /* |
90 | * Remove an inode relocation entry, along with all of the |
91 | * inode references. |
92 | */ |
93 | errcode_t (*delete)(ext2_irel irel, ext2_ino_t old); |
94 | |
95 | /* |
96 | * Free the inode relocation table. |
97 | */ |
98 | errcode_t (*free)(ext2_irel irel); |
99 | }; |
100 | |
101 | errcode_t ext2fs_irel_memarray_create(char *name, ext2_ino_t max_inode, |
102 | ext2_irel *irel); |
103 | |
104 | #define ext2fs_irel_put(irel, old, ent) ((irel)->put((irel), old, ent)) |
105 | #define ext2fs_irel_get(irel, old, ent) ((irel)->get((irel), old, ent)) |
106 | #define ext2fs_irel_get_by_orig(irel, orig, old, ent) \ |
107 | ((irel)->get_by_orig((irel), orig, old, ent)) |
108 | #define ext2fs_irel_start_iter(irel) ((irel)->start_iter((irel))) |
109 | #define ext2fs_irel_next(irel, old, ent) ((irel)->next((irel), old, ent)) |
110 | #define ext2fs_irel_add_ref(irel, ino, ref) ((irel)->add_ref((irel), ino, ref)) |
111 | #define ext2fs_irel_start_iter_ref(irel, ino) ((irel)->start_iter_ref((irel), ino)) |
112 | #define ext2fs_irel_next_ref(irel, ref) ((irel)->next_ref((irel), ref)) |
113 | #define ext2fs_irel_move(irel, old, new) ((irel)->move((irel), old, new)) |
114 | #define ext2fs_irel_delete(irel, old) ((irel)->delete((irel), old)) |
115 | #define ext2fs_irel_free(irel) ((irel)->free((irel))) |
116 |