| Denis Vlasenko | c4f623e | 2006-12-26 01:30:59 +0000 | [diff] [blame] | 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 | |
| 101 | return 0; |
| 102 | } |
| 103 | |
| 104 | |
| 105 | |
| 106 | errcode_t ext2fs_allocate_tables(ext2_filsys fs) |
| 107 | { |
| 108 | errcode_t retval; |
| 109 | dgrp_t i; |
| 110 | |
| 111 | for (i = 0; i < fs->group_desc_count; i++) { |
| 112 | retval = ext2fs_allocate_group_table(fs, i, fs->block_map); |
| 113 | if (retval) |
| 114 | return retval; |
| 115 | } |
| 116 | return 0; |
| 117 | } |
| 118 | |