| 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 |
|
|---|
| 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 = fs->super->s_first_data_block +
|
|---|
| 38 | (group * fs->super->s_blocks_per_group);
|
|---|
| 39 |
|
|---|
| 40 | last_blk = group_blk + fs->super->s_blocks_per_group;
|
|---|
| 41 | if (last_blk >= fs->super->s_blocks_count)
|
|---|
| 42 | last_blk = fs->super->s_blocks_count - 1;
|
|---|
| 43 |
|
|---|
| 44 | if (!bmap)
|
|---|
| 45 | bmap = fs->block_map;
|
|---|
| 46 |
|
|---|
| 47 | /*
|
|---|
| 48 | * Allocate the block and inode bitmaps, if necessary
|
|---|
| 49 | */
|
|---|
| 50 | if (fs->stride) {
|
|---|
| 51 | start_blk = group_blk + fs->inode_blocks_per_group;
|
|---|
| 52 | start_blk += ((fs->stride * group) %
|
|---|
| 53 | (last_blk - start_blk));
|
|---|
| 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 |
|
|---|
| 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 |
|
|---|
