/* vi: set sw=4 ts=4: *//* * bitmaps.c --- routines to read, write, and manipulate the inode and * block bitmaps. * * Copyright (C) 1993, 1994, 1995, 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#include "ext2_fs.h"#include "ext2fs.h"static errcode_t make_bitmap(__u32 start, __u32 end, __u32 real_end,			     const char *descr, char *init_map,			     ext2fs_generic_bitmap *ret){	ext2fs_generic_bitmap	bitmap;	errcode_t		retval;	size_t			size;	retval = ext2fs_get_mem(sizeof(struct ext2fs_struct_generic_bitmap),				&bitmap);	if (retval)		return retval;	bitmap->magic = EXT2_ET_MAGIC_GENERIC_BITMAP;	bitmap->fs = NULL;	bitmap->start = start;	bitmap->end = end;	bitmap->real_end = real_end;	bitmap->base_error_code = EXT2_ET_BAD_GENERIC_MARK;	if (descr) {		retval = ext2fs_get_mem(strlen(descr)+1, &bitmap->description);		if (retval) {			ext2fs_free_mem(&bitmap);			return retval;		}		strcpy(bitmap->description, descr);	} else		bitmap->description = 0;	size = (size_t) (((bitmap->real_end - bitmap->start) / 8) + 1);	retval = ext2fs_get_mem(size, &bitmap->bitmap);	if (retval) {		ext2fs_free_mem(&bitmap->description);		ext2fs_free_mem(&bitmap);		return retval;	}	if (init_map)		memcpy(bitmap->bitmap, init_map, size);	else		memset(bitmap->bitmap, 0, size);	*ret = bitmap;	return 0;}errcode_t ext2fs_allocate_generic_bitmap(__u32 start,					 __u32 end,					 __u32 real_end,					 const char *descr,					 ext2fs_generic_bitmap *ret){	return make_bitmap(start, end, real_end, descr, 0, ret);}errcode_t ext2fs_copy_bitmap(ext2fs_generic_bitmap src,			     ext2fs_generic_bitmap *dest){	errcode_t		retval;	ext2fs_generic_bitmap	new_map;	retval = make_bitmap(src->start, src->end, src->real_end,			     src->description, src->bitmap, &new_map);	if (retval)		return retval;	new_map->magic = src->magic;	new_map->fs = src->fs;	new_map->base_error_code = src->base_error_code;	*dest = new_map;	return 0;}void ext2fs_set_bitmap_padding(ext2fs_generic_bitmap map){	__u32	i, j;	for (i=map->end+1, j = i - map->start; i <= map->real_end; i++, j++)		ext2fs_set_bit(j, map->bitmap);}errcode_t ext2fs_allocate_inode_bitmap(ext2_filsys fs,				       const char *descr,				       ext2fs_inode_bitmap *ret){	ext2fs_inode_bitmap bitmap;	errcode_t	retval;	__u32		start, end, real_end;	EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);	fs->write_bitmaps = ext2fs_write_bitmaps;	start = 1;	end = fs->super->s_inodes_count;	real_end = (EXT2_INODES_PER_GROUP(fs->super) * fs->group_desc_count);	retval = ext2fs_allocate_generic_bitmap(start, end, real_end,						descr, &bitmap);	if (retval)		return retval;	bitmap->magic = EXT2_ET_MAGIC_INODE_BITMAP;	bitmap->fs = fs;	bitmap->base_error_code = EXT2_ET_BAD_INODE_MARK;	*ret = bitmap;	return 0;}errcode_t ext2fs_allocate_block_bitmap(ext2_filsys fs,				       const char *descr,				       ext2fs_block_bitmap *ret){	ext2fs_block_bitmap bitmap;	errcode_t	retval;	__u32		start, end, real_end;	EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);	fs->write_bitmaps = ext2fs_write_bitmaps;	start = fs->super->s_first_data_block;	end = fs->super->s_blocks_count-1;	real_end = (EXT2_BLOCKS_PER_GROUP(fs->super)		    * fs->group_desc_count)-1 + start;	retval = ext2fs_allocate_generic_bitmap(start, end, real_end,						descr, &bitmap);	if (retval)		return retval;	bitmap->magic = EXT2_ET_MAGIC_BLOCK_BITMAP;	bitmap->fs = fs;	bitmap->base_error_code = EXT2_ET_BAD_BLOCK_MARK;	*ret = bitmap;	return 0;}errcode_t ext2fs_fudge_inode_bitmap_end(ext2fs_inode_bitmap bitmap,					ext2_ino_t end, ext2_ino_t *oend){	EXT2_CHECK_MAGIC(bitmap, EXT2_ET_MAGIC_INODE_BITMAP);	if (end > bitmap->real_end)		return EXT2_ET_FUDGE_INODE_BITMAP_END;	if (oend)		*oend = bitmap->end;	bitmap->end = end;	return 0;}errcode_t ext2fs_fudge_block_bitmap_end(ext2fs_block_bitmap bitmap,					blk_t end, blk_t *oend){	EXT2_CHECK_MAGIC(bitmap, EXT2_ET_MAGIC_BLOCK_BITMAP);	if (end > bitmap->real_end)		return EXT2_ET_FUDGE_BLOCK_BITMAP_END;	if (oend)		*oend = bitmap->end;	bitmap->end = end;	return 0;}void ext2fs_clear_inode_bitmap(ext2fs_inode_bitmap bitmap){	if (!bitmap || (bitmap->magic != EXT2_ET_MAGIC_INODE_BITMAP))		return;	memset(bitmap->bitmap, 0,	       (size_t) (((bitmap->real_end - bitmap->start) / 8) + 1));}void ext2fs_clear_block_bitmap(ext2fs_block_bitmap bitmap){	if (!bitmap || (bitmap->magic != EXT2_ET_MAGIC_BLOCK_BITMAP))		return;	memset(bitmap->bitmap, 0,	       (size_t) (((bitmap->real_end - bitmap->start) / 8) + 1));}