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