/* vi: set sw=4 ts=4: *//* * brel_ma.c * * Copyright (C) 1996, 1997 Theodore Ts'o. * * TODO: rewrite to not use a direct array!!!  (Fortunately this * module isn't really used yet.) * * %Begin-Header% * This file may be redistributed under the terms of the GNU Public * License. * %End-Header% */#include <fcntl.h>#include <stdio.h>#include <string.h>#if HAVE_UNISTD_H#include <unistd.h>#endif#if HAVE_ERRNO_H#include <errno.h>#endif#include "ext2_fs.h"#include "ext2fs.h"#include "brel.h"static errcode_t bma_put(ext2_brel brel, blk_t old,			struct ext2_block_relocate_entry *ent);static errcode_t bma_get(ext2_brel brel, blk_t old,			struct ext2_block_relocate_entry *ent);static errcode_t bma_start_iter(ext2_brel brel);static errcode_t bma_next(ext2_brel brel, blk_t *old,			 struct ext2_block_relocate_entry *ent);static errcode_t bma_move(ext2_brel brel, blk_t old, blk_t new);static errcode_t bma_delete(ext2_brel brel, blk_t old);static errcode_t bma_free(ext2_brel brel);struct brel_ma {	__u32 magic;	blk_t max_block;	struct ext2_block_relocate_entry *entries;};errcode_t ext2fs_brel_memarray_create(char *name, blk_t max_block,				      ext2_brel *new_brel){	ext2_brel		brel = 0;	errcode_t	retval;	struct brel_ma	*ma = 0;	size_t		size;	*new_brel = 0;	/*	 * Allocate memory structures	 */	retval = ext2fs_get_mem(sizeof(struct ext2_block_relocation_table),				&brel);	if (retval)		goto errout;	memset(brel, 0, sizeof(struct ext2_block_relocation_table));	retval = ext2fs_get_mem(strlen(name)+1, &brel->name);	if (retval)		goto errout;	strcpy(brel->name, name);	retval = ext2fs_get_mem(sizeof(struct brel_ma), &ma);	if (retval)		goto errout;	memset(ma, 0, sizeof(struct brel_ma));	brel->priv_data = ma;	size = (size_t) (sizeof(struct ext2_block_relocate_entry) *			 (max_block+1));	retval = ext2fs_get_mem(size, &ma->entries);	if (retval)		goto errout;	memset(ma->entries, 0, size);	ma->max_block = max_block;	/*	 * Fill in the brel data structure	 */	brel->put = bma_put;	brel->get = bma_get;	brel->start_iter = bma_start_iter;	brel->next = bma_next;	brel->move = bma_move;	brel->delete = bma_delete;	brel->free = bma_free;	*new_brel = brel;	return 0;errout:	bma_free(brel);	return retval;}static errcode_t bma_put(ext2_brel brel, blk_t old,			struct ext2_block_relocate_entry *ent){	struct brel_ma	*ma;	ma = brel->priv_data;	if (old > ma->max_block)		return EXT2_ET_INVALID_ARGUMENT;	ma->entries[(unsigned)old] = *ent;	return 0;}static errcode_t bma_get(ext2_brel brel, blk_t old,			struct ext2_block_relocate_entry *ent){	struct brel_ma	*ma;	ma = brel->priv_data;	if (old > ma->max_block)		return EXT2_ET_INVALID_ARGUMENT;	if (ma->entries[(unsigned)old].new == 0)		return ENOENT;	*ent = ma->entries[old];	return 0;}static errcode_t bma_start_iter(ext2_brel brel){	brel->current = 0;	return 0;}static errcode_t bma_next(ext2_brel brel, blk_t *old,			  struct ext2_block_relocate_entry *ent){	struct brel_ma	*ma;	ma = brel->priv_data;	while (++brel->current < ma->max_block) {		if (ma->entries[(unsigned)brel->current].new == 0)			continue;		*old = brel->current;		*ent = ma->entries[(unsigned)brel->current];		return 0;	}	*old = 0;	return 0;}static errcode_t bma_move(ext2_brel brel, blk_t old, blk_t new){	struct brel_ma	*ma;	ma = brel->priv_data;	if ((old > ma->max_block) || (new > ma->max_block))		return EXT2_ET_INVALID_ARGUMENT;	if (ma->entries[(unsigned)old].new == 0)		return ENOENT;	ma->entries[(unsigned)new] = ma->entries[old];	ma->entries[(unsigned)old].new = 0;	return 0;}static errcode_t bma_delete(ext2_brel brel, blk_t old){	struct brel_ma	*ma;	ma = brel->priv_data;	if (old > ma->max_block)		return EXT2_ET_INVALID_ARGUMENT;	if (ma->entries[(unsigned)old].new == 0)		return ENOENT;	ma->entries[(unsigned)old].new = 0;	return 0;}static errcode_t bma_free(ext2_brel brel){	struct brel_ma	*ma;	if (!brel)		return 0;	ma = brel->priv_data;	if (ma) {		ext2fs_free_mem(&ma->entries);		ext2fs_free_mem(&ma);	}	ext2fs_free_mem(&brel->name);	ext2fs_free_mem(&brel);	return 0;}