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 = 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 } 102 103 104 105 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 } 117 118
