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