1 | /* vi: set sw=4 ts=4: */
|
---|
2 | /*
|
---|
3 | * alloc_tables.c --- Allocate tables for a newly initialized
|
---|
4 | * filesystem. Used by mke2fs when initializing a filesystem
|
---|
5 | *
|
---|
6 | * Copyright (C) 1996 Theodore Ts'o.
|
---|
7 | *
|
---|
8 | * %Begin-Header%
|
---|
9 | * This file may be redistributed under the terms of the GNU Public
|
---|
10 | * License.
|
---|
11 | * %End-Header%
|
---|
12 | */
|
---|
13 |
|
---|
14 | #include <stdio.h>
|
---|
15 | #include <string.h>
|
---|
16 | #if HAVE_UNISTD_H
|
---|
17 | #include <unistd.h>
|
---|
18 | #endif
|
---|
19 | #include <fcntl.h>
|
---|
20 | #include <time.h>
|
---|
21 | #if HAVE_SYS_STAT_H
|
---|
22 | #include <sys/stat.h>
|
---|
23 | #endif
|
---|
24 | #if HAVE_SYS_TYPES_H
|
---|
25 | #include <sys/types.h>
|
---|
26 | #endif
|
---|
27 |
|
---|
28 | #include "ext2_fs.h"
|
---|
29 | #include "ext2fs.h"
|
---|
30 |
|
---|
31 | errcode_t ext2fs_allocate_group_table(ext2_filsys fs, dgrp_t group,
|
---|
32 | ext2fs_block_bitmap bmap)
|
---|
33 | {
|
---|
34 | errcode_t retval;
|
---|
35 | blk_t group_blk, start_blk, last_blk, new_blk, blk;
|
---|
36 | int j;
|
---|
37 |
|
---|
38 | group_blk = fs->super->s_first_data_block +
|
---|
39 | (group * fs->super->s_blocks_per_group);
|
---|
40 |
|
---|
41 | last_blk = group_blk + fs->super->s_blocks_per_group;
|
---|
42 | if (last_blk >= fs->super->s_blocks_count)
|
---|
43 | last_blk = fs->super->s_blocks_count - 1;
|
---|
44 |
|
---|
45 | if (!bmap)
|
---|
46 | bmap = fs->block_map;
|
---|
47 |
|
---|
48 | /*
|
---|
49 | * Allocate the block and inode bitmaps, if necessary
|
---|
50 | */
|
---|
51 | if (fs->stride) {
|
---|
52 | start_blk = group_blk + fs->inode_blocks_per_group;
|
---|
53 | start_blk += ((fs->stride * group) %
|
---|
54 | (last_blk - start_blk));
|
---|
55 | if (start_blk > last_blk)
|
---|
56 | start_blk = group_blk;
|
---|
57 | } else
|
---|
58 | start_blk = group_blk;
|
---|
59 |
|
---|
60 | if (!fs->group_desc[group].bg_block_bitmap) {
|
---|
61 | retval = ext2fs_get_free_blocks(fs, start_blk, last_blk,
|
---|
62 | 1, bmap, &new_blk);
|
---|
63 | if (retval == EXT2_ET_BLOCK_ALLOC_FAIL)
|
---|
64 | retval = ext2fs_get_free_blocks(fs, group_blk,
|
---|
65 | last_blk, 1, bmap, &new_blk);
|
---|
66 | if (retval)
|
---|
67 | return retval;
|
---|
68 | ext2fs_mark_block_bitmap(bmap, new_blk);
|
---|
69 | fs->group_desc[group].bg_block_bitmap = new_blk;
|
---|
70 | }
|
---|
71 |
|
---|
72 | if (!fs->group_desc[group].bg_inode_bitmap) {
|
---|
73 | retval = ext2fs_get_free_blocks(fs, start_blk, last_blk,
|
---|
74 | 1, bmap, &new_blk);
|
---|
75 | if (retval == EXT2_ET_BLOCK_ALLOC_FAIL)
|
---|
76 | retval = ext2fs_get_free_blocks(fs, group_blk,
|
---|
77 | last_blk, 1, bmap, &new_blk);
|
---|
78 | if (retval)
|
---|
79 | return retval;
|
---|
80 | ext2fs_mark_block_bitmap(bmap, new_blk);
|
---|
81 | fs->group_desc[group].bg_inode_bitmap = new_blk;
|
---|
82 | }
|
---|
83 |
|
---|
84 | /*
|
---|
85 | * Allocate the inode table
|
---|
86 | */
|
---|
87 | if (!fs->group_desc[group].bg_inode_table) {
|
---|
88 | retval = ext2fs_get_free_blocks(fs, group_blk, last_blk,
|
---|
89 | fs->inode_blocks_per_group,
|
---|
90 | bmap, &new_blk);
|
---|
91 | if (retval)
|
---|
92 | return retval;
|
---|
93 | for (j=0, blk = new_blk;
|
---|
94 | j < fs->inode_blocks_per_group;
|
---|
95 | j++, blk++)
|
---|
96 | ext2fs_mark_block_bitmap(bmap, blk);
|
---|
97 | fs->group_desc[group].bg_inode_table = new_blk;
|
---|
98 | }
|
---|
99 |
|
---|
100 |
|
---|
101 | return 0;
|
---|
102 | }
|
---|
103 |
|
---|
104 |
|
---|
105 |
|
---|
106 | errcode_t ext2fs_allocate_tables(ext2_filsys fs)
|
---|
107 | {
|
---|
108 | errcode_t retval;
|
---|
109 | dgrp_t i;
|
---|
110 |
|
---|
111 | for (i = 0; i < fs->group_desc_count; i++) {
|
---|
112 | retval = ext2fs_allocate_group_table(fs, i, fs->block_map);
|
---|
113 | if (retval)
|
---|
114 | return retval;
|
---|
115 | }
|
---|
116 | return 0;
|
---|
117 | }
|
---|
118 |
|
---|