/* vi: set sw=4 ts=4: *//* * ext2fs.h --- ext2fs * * 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 "ext2fs.h"#include "bitops.h"#include <string.h>/* *  Allocate memory */errcode_t ext2fs_get_mem(unsigned long size, void *ptr){	void **pp = (void **)ptr;	*pp = malloc(size);	if (!*pp)		return EXT2_ET_NO_MEMORY;	return 0;}/* * Free memory */errcode_t ext2fs_free_mem(void *ptr){	void **pp = (void **)ptr;	free(*pp);	*pp = 0;	return 0;}/* *  Resize memory */errcode_t ext2fs_resize_mem(unsigned long EXT2FS_ATTR((unused)) old_size,				     unsigned long size, void *ptr){	void *p;	/* Use "memcpy" for pointer assignments here to avoid problems	 * with C99 strict type aliasing rules. */	memcpy(&p, ptr, sizeof (p));	p = realloc(p, size);	if (!p)		return EXT2_ET_NO_MEMORY;	memcpy(ptr, &p, sizeof (p));	return 0;}/* * Mark a filesystem superblock as dirty */void ext2fs_mark_super_dirty(ext2_filsys fs){	fs->flags |= EXT2_FLAG_DIRTY | EXT2_FLAG_CHANGED;}/* * Mark a filesystem as changed */void ext2fs_mark_changed(ext2_filsys fs){	fs->flags |= EXT2_FLAG_CHANGED;}/* * Check to see if a filesystem has changed */int ext2fs_test_changed(ext2_filsys fs){	return (fs->flags & EXT2_FLAG_CHANGED);}/* * Mark a filesystem as valid */void ext2fs_mark_valid(ext2_filsys fs){	fs->flags |= EXT2_FLAG_VALID;}/* * Mark a filesystem as NOT valid */void ext2fs_unmark_valid(ext2_filsys fs){	fs->flags &= ~EXT2_FLAG_VALID;}/* * Check to see if a filesystem is valid */int ext2fs_test_valid(ext2_filsys fs){	return (fs->flags & EXT2_FLAG_VALID);}/* * Mark the inode bitmap as dirty */void ext2fs_mark_ib_dirty(ext2_filsys fs){	fs->flags |= EXT2_FLAG_IB_DIRTY | EXT2_FLAG_CHANGED;}/* * Mark the block bitmap as dirty */void ext2fs_mark_bb_dirty(ext2_filsys fs){	fs->flags |= EXT2_FLAG_BB_DIRTY | EXT2_FLAG_CHANGED;}/* * Check to see if a filesystem's inode bitmap is dirty */int ext2fs_test_ib_dirty(ext2_filsys fs){	return (fs->flags & EXT2_FLAG_IB_DIRTY);}/* * Check to see if a filesystem's block bitmap is dirty */int ext2fs_test_bb_dirty(ext2_filsys fs){	return (fs->flags & EXT2_FLAG_BB_DIRTY);}/* * Return the group # of a block */int ext2fs_group_of_blk(ext2_filsys fs, blk_t blk){	return (blk - fs->super->s_first_data_block) /		fs->super->s_blocks_per_group;}/* * Return the group # of an inode number */int ext2fs_group_of_ino(ext2_filsys fs, ext2_ino_t ino){	return (ino - 1) / fs->super->s_inodes_per_group;}blk_t ext2fs_inode_data_blocks(ext2_filsys fs,					struct ext2_inode *inode){       return inode->i_blocks -	      (inode->i_file_acl ? fs->blocksize >> 9 : 0);}__u16 ext2fs_swab16(__u16 val){	return (val >> 8) | (val << 8);}__u32 ext2fs_swab32(__u32 val){	return ((val>>24) | ((val>>8)&0xFF00) |		((val<<8)&0xFF0000) | (val<<24));}int ext2fs_test_generic_bitmap(ext2fs_generic_bitmap bitmap,					blk_t bitno);int ext2fs_test_generic_bitmap(ext2fs_generic_bitmap bitmap,					blk_t bitno){	if ((bitno < bitmap->start) || (bitno > bitmap->end)) {		ext2fs_warn_bitmap2(bitmap, EXT2FS_TEST_ERROR, bitno);		return 0;	}	return ext2fs_test_bit(bitno - bitmap->start, bitmap->bitmap);}int ext2fs_mark_block_bitmap(ext2fs_block_bitmap bitmap,				       blk_t block){	return ext2fs_mark_generic_bitmap((ext2fs_generic_bitmap)				       bitmap,					  block);}int ext2fs_unmark_block_bitmap(ext2fs_block_bitmap bitmap,					 blk_t block){	return ext2fs_unmark_generic_bitmap((ext2fs_generic_bitmap) bitmap,					    block);}int ext2fs_test_block_bitmap(ext2fs_block_bitmap bitmap,				       blk_t block){	return ext2fs_test_generic_bitmap((ext2fs_generic_bitmap) bitmap,					  block);}int ext2fs_mark_inode_bitmap(ext2fs_inode_bitmap bitmap,				       ext2_ino_t inode){	return ext2fs_mark_generic_bitmap((ext2fs_generic_bitmap) bitmap,					  inode);}int ext2fs_unmark_inode_bitmap(ext2fs_inode_bitmap bitmap,					 ext2_ino_t inode){	return ext2fs_unmark_generic_bitmap((ext2fs_generic_bitmap) bitmap,				     inode);}int ext2fs_test_inode_bitmap(ext2fs_inode_bitmap bitmap,				       ext2_ino_t inode){	return ext2fs_test_generic_bitmap((ext2fs_generic_bitmap) bitmap,					  inode);}void ext2fs_fast_mark_block_bitmap(ext2fs_block_bitmap bitmap,					    blk_t block){	ext2fs_set_bit(block - bitmap->start, bitmap->bitmap);}void ext2fs_fast_unmark_block_bitmap(ext2fs_block_bitmap bitmap,					      blk_t block){	ext2fs_clear_bit(block - bitmap->start, bitmap->bitmap);}int ext2fs_fast_test_block_bitmap(ext2fs_block_bitmap bitmap,					    blk_t block){	return ext2fs_test_bit(block - bitmap->start, bitmap->bitmap);}void ext2fs_fast_mark_inode_bitmap(ext2fs_inode_bitmap bitmap,					    ext2_ino_t inode){	ext2fs_set_bit(inode - bitmap->start, bitmap->bitmap);}void ext2fs_fast_unmark_inode_bitmap(ext2fs_inode_bitmap bitmap,					      ext2_ino_t inode){	ext2fs_clear_bit(inode - bitmap->start, bitmap->bitmap);}int ext2fs_fast_test_inode_bitmap(ext2fs_inode_bitmap bitmap,					   ext2_ino_t inode){	return ext2fs_test_bit(inode - bitmap->start, bitmap->bitmap);}blk_t ext2fs_get_block_bitmap_start(ext2fs_block_bitmap bitmap){	return bitmap->start;}ext2_ino_t ext2fs_get_inode_bitmap_start(ext2fs_inode_bitmap bitmap){	return bitmap->start;}blk_t ext2fs_get_block_bitmap_end(ext2fs_block_bitmap bitmap){	return bitmap->end;}ext2_ino_t ext2fs_get_inode_bitmap_end(ext2fs_inode_bitmap bitmap){	return bitmap->end;}int ext2fs_test_block_bitmap_range(ext2fs_block_bitmap bitmap,					    blk_t block, int num){	int	i;	if ((block < bitmap->start) || (block+num-1 > bitmap->end)) {		ext2fs_warn_bitmap(EXT2_ET_BAD_BLOCK_TEST,				   block, bitmap->description);		return 0;	}	for (i=0; i < num; i++) {		if (ext2fs_fast_test_block_bitmap(bitmap, block+i))			return 0;	}	return 1;}int ext2fs_fast_test_block_bitmap_range(ext2fs_block_bitmap bitmap,						 blk_t block, int num){	int	i;	for (i=0; i < num; i++) {		if (ext2fs_fast_test_block_bitmap(bitmap, block+i))			return 0;	}	return 1;}void ext2fs_mark_block_bitmap_range(ext2fs_block_bitmap bitmap,					     blk_t block, int num){	int	i;	if ((block < bitmap->start) || (block+num-1 > bitmap->end)) {		ext2fs_warn_bitmap(EXT2_ET_BAD_BLOCK_MARK, block,				   bitmap->description);		return;	}	for (i=0; i < num; i++)		ext2fs_set_bit(block + i - bitmap->start, bitmap->bitmap);}void ext2fs_fast_mark_block_bitmap_range(ext2fs_block_bitmap bitmap,						  blk_t block, int num){	int	i;	for (i=0; i < num; i++)		ext2fs_set_bit(block + i - bitmap->start, bitmap->bitmap);}void ext2fs_unmark_block_bitmap_range(ext2fs_block_bitmap bitmap,					       blk_t block, int num){	int	i;	if ((block < bitmap->start) || (block+num-1 > bitmap->end)) {		ext2fs_warn_bitmap(EXT2_ET_BAD_BLOCK_UNMARK, block,				   bitmap->description);		return;	}	for (i=0; i < num; i++)		ext2fs_clear_bit(block + i - bitmap->start, bitmap->bitmap);}void ext2fs_fast_unmark_block_bitmap_range(ext2fs_block_bitmap bitmap,						    blk_t block, int num){	int	i;	for (i=0; i < num; i++)		ext2fs_clear_bit(block + i - bitmap->start, bitmap->bitmap);}