alloc_tables.c revision abf23439d51a3ddbca475b931abebd381ff7ceea 
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
30errcode_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
105errcode_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