| /* |
| * alloc_tables.c --- Allocate tables for a newly initialized |
| * filesystem. Used by mke2fs when initializing a filesystem |
| * |
| * Copyright (C) 1996 Theodore Ts'o. |
| * |
| * %Begin-Header% |
| * This file may be redistributed under the terms of the GNU Public |
| * License. |
| * %End-Header% |
| */ |
| |
| #include <stdio.h> |
| #include <string.h> |
| #if HAVE_UNISTD_H |
| #include <unistd.h> |
| #endif |
| #include <fcntl.h> |
| #include <time.h> |
| #if HAVE_SYS_STAT_H |
| #include <sys/stat.h> |
| #endif |
| #if HAVE_SYS_TYPES_H |
| #include <sys/types.h> |
| #endif |
| |
| #if EXT2_FLAT_INCLUDES |
| #include "ext2_fs.h" |
| #else |
| #include <linux/ext2_fs.h> |
| #endif |
| |
| #include "ext2fs.h" |
| |
| errcode_t ext2fs_allocate_group_table(ext2_filsys fs, int group, |
| ext2fs_block_bitmap bmap) |
| { |
| errcode_t retval; |
| blk_t group_blk, start_blk, last_blk, new_blk, blk; |
| int j; |
| |
| group_blk = fs->super->s_first_data_block + |
| (group * fs->super->s_blocks_per_group); |
| |
| last_blk = group_blk + fs->super->s_blocks_per_group; |
| if (last_blk >= fs->super->s_blocks_count) |
| last_blk = fs->super->s_blocks_count - 1; |
| |
| start_blk = group_blk + 3 + fs->desc_blocks; |
| if (start_blk > last_blk) |
| start_blk = group_blk; |
| |
| if (!bmap) |
| bmap = fs->block_map; |
| |
| /* |
| * Allocate the inode table |
| */ |
| if (!fs->group_desc[group].bg_inode_table) { |
| retval = ext2fs_get_free_blocks(fs, start_blk, last_blk, |
| fs->inode_blocks_per_group, |
| bmap, &new_blk); |
| if (retval) |
| return retval; |
| for (j=0, blk = new_blk; |
| j < fs->inode_blocks_per_group; |
| j++, blk++) |
| ext2fs_mark_block_bitmap(bmap, blk); |
| fs->group_desc[group].bg_inode_table = new_blk; |
| } |
| |
| /* |
| * Allocate the block and inode bitmaps, if necessary |
| */ |
| if (fs->stride) { |
| start_blk += fs->inode_blocks_per_group; |
| start_blk += ((fs->stride * group) % |
| (last_blk - start_blk)); |
| if (start_blk > last_blk) |
| /* should never happen */ |
| start_blk = group_blk; |
| } else |
| start_blk = group_blk; |
| |
| if (!fs->group_desc[group].bg_block_bitmap) { |
| retval = ext2fs_get_free_blocks(fs, start_blk, last_blk, |
| 1, bmap, &new_blk); |
| if (retval == EXT2_ET_BLOCK_ALLOC_FAIL) |
| retval = ext2fs_get_free_blocks(fs, group_blk, |
| last_blk, 1, bmap, &new_blk); |
| if (retval) |
| return retval; |
| ext2fs_mark_block_bitmap(bmap, new_blk); |
| fs->group_desc[group].bg_block_bitmap = new_blk; |
| } |
| |
| if (!fs->group_desc[group].bg_inode_bitmap) { |
| retval = ext2fs_get_free_blocks(fs, start_blk, last_blk, |
| 1, bmap, &new_blk); |
| if (retval == EXT2_ET_BLOCK_ALLOC_FAIL) |
| retval = ext2fs_get_free_blocks(fs, group_blk, |
| last_blk, 1, bmap, &new_blk); |
| if (retval) |
| return retval; |
| ext2fs_mark_block_bitmap(bmap, new_blk); |
| fs->group_desc[group].bg_inode_bitmap = new_blk; |
| } |
| return 0; |
| } |
| |
| |
| |
| errcode_t ext2fs_allocate_tables(ext2_filsys fs) |
| { |
| errcode_t retval; |
| int i; |
| |
| for (i = 0; i < fs->group_desc_count; i++) { |
| retval = ext2fs_allocate_group_table(fs, i, fs->block_map); |
| if (retval) |
| return retval; |
| } |
| return 0; |
| } |
| |