1 /*
2 * alloc_tables.c --- Allocate tables for a newly initialized
3 * filesystem. Used by mke2fs when initializing a filesystem
4 *
5 * Copyright (C) 1996 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 #include <stdio.h>
14 #include <string.h>
15 #if HAVE_UNISTD_H
16 #include <unistd.h>
17 #endif
18 #include <fcntl.h>
19 #include <time.h>
20 #if HAVE_SYS_STAT_H
21 #include <sys/stat.h>
22 #endif
23 #if HAVE_SYS_TYPES_H
24 #include <sys/types.h>
25 #endif
26
27 #include "ext2_fs.h"
28 #include "ext2fs.h"
29
ext2fs_allocate_group_table(ext2_filsys fs,dgrp_t group,ext2fs_block_bitmap bmap)30 errcode_t ext2fs_allocate_group_table(ext2_filsys fs, dgrp_t group,
31 ext2fs_block_bitmap bmap)
32 {
33 errcode_t retval;
34 blk_t group_blk, start_blk, last_blk, new_blk, blk;
35 int j;
36
37 group_blk = ext2fs_group_first_block(fs, group);
38 last_blk = ext2fs_group_last_block(fs, group);
39
40 if (!bmap)
41 bmap = fs->block_map;
42
43 /*
44 * Allocate the block and inode bitmaps, if necessary
45 */
46 if (fs->stride) {
47 retval = ext2fs_get_free_blocks(fs, group_blk, last_blk,
48 1, bmap, &start_blk);
49 if (retval)
50 return retval;
51 start_blk += fs->inode_blocks_per_group;
52 start_blk += ((fs->stride * group) %
53 (last_blk - start_blk + 1));
54 if (start_blk >= last_blk)
55 start_blk = group_blk;
56 } else
57 start_blk = group_blk;
58
59 if (!fs->group_desc[group].bg_block_bitmap) {
60 retval = ext2fs_get_free_blocks(fs, start_blk, last_blk,
61 1, bmap, &new_blk);
62 if (retval == EXT2_ET_BLOCK_ALLOC_FAIL)
63 retval = ext2fs_get_free_blocks(fs, group_blk,
64 last_blk, 1, bmap, &new_blk);
65 if (retval)
66 return retval;
67 ext2fs_mark_block_bitmap(bmap, new_blk);
68 fs->group_desc[group].bg_block_bitmap = new_blk;
69 }
70
71 if (!fs->group_desc[group].bg_inode_bitmap) {
72 retval = ext2fs_get_free_blocks(fs, start_blk, last_blk,
73 1, bmap, &new_blk);
74 if (retval == EXT2_ET_BLOCK_ALLOC_FAIL)
75 retval = ext2fs_get_free_blocks(fs, group_blk,
76 last_blk, 1, bmap, &new_blk);
77 if (retval)
78 return retval;
79 ext2fs_mark_block_bitmap(bmap, new_blk);
80 fs->group_desc[group].bg_inode_bitmap = new_blk;
81 }
82
83 /*
84 * Allocate the inode table
85 */
86 if (!fs->group_desc[group].bg_inode_table) {
87 retval = ext2fs_get_free_blocks(fs, group_blk, last_blk,
88 fs->inode_blocks_per_group,
89 bmap, &new_blk);
90 if (retval)
91 return retval;
92 for (j=0, blk = new_blk;
93 j < fs->inode_blocks_per_group;
94 j++, blk++)
95 ext2fs_mark_block_bitmap(bmap, blk);
96 fs->group_desc[group].bg_inode_table = new_blk;
97 }
98
99
100 return 0;
101 }
102
103
104
ext2fs_allocate_tables(ext2_filsys fs)105 errcode_t ext2fs_allocate_tables(ext2_filsys fs)
106 {
107 errcode_t retval;
108 dgrp_t i;
109
110 for (i = 0; i < fs->group_desc_count; i++) {
111 retval = ext2fs_allocate_group_table(fs, i, fs->block_map);
112 if (retval)
113 return retval;
114 }
115 return 0;
116 }
117
118