blob: 7c60e2bf5fcfc854cc7d9ffee543c70547b4fb47
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 | return 0; |
101 | } |
102 | |
103 | errcode_t ext2fs_allocate_tables(ext2_filsys fs) |
104 | { |
105 | errcode_t retval; |
106 | dgrp_t i; |
107 | |
108 | for (i = 0; i < fs->group_desc_count; i++) { |
109 | retval = ext2fs_allocate_group_table(fs, i, fs->block_map); |
110 | if (retval) |
111 | return retval; |
112 | } |
113 | return 0; |
114 | } |
115 |