ext4_utils/allocate.h

/*
 * Copyright (C) 2010 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *	  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef _ALLOCATE_H_
#define _ALLOCATE_H_

#define EXT4_ALLOCATE_FAILED (u32)(~0)

#include "ext4_utils.h"

struct region {
	u32 block;
	u32 len;
	int bg;
	struct region *next;
	struct region *prev;
};

struct region_list {
	struct region *first;
	struct region *last;
	struct region *iter;
	u32 partial_iter;
};

struct block_allocation {
	struct region_list list;
	struct region_list oob_list;
	char* filename;
	struct block_allocation* next;
};

struct block_group_info {
	u32 first_block;
	int header_blocks;
	int data_blocks_used;
	int has_superblock;
	u8 *bitmaps;
	u8 *block_bitmap;
	u8 *inode_bitmap;
	u8 *inode_table;
	u32 free_blocks;
	u32 free_inodes;
	u32 first_free_inode;
	u16 flags;
	u16 used_dirs;
	int chunk_count;
	int max_chunk_count;
	struct region *chunks;
};

void block_allocator_init();
void block_allocator_free();
u32 allocate_block();
struct block_allocation *allocate_blocks(u32 len);
int block_allocation_num_regions(struct block_allocation *alloc);
int block_allocation_len(struct block_allocation *alloc);
struct ext4_inode *get_inode(u32 inode);
struct ext4_xattr_header *get_xattr_block_for_inode(struct ext4_inode *inode);
void reduce_allocation(struct block_allocation *alloc, u32 len);
u32 get_block(struct block_allocation *alloc, u32 block);
u32 get_oob_block(struct block_allocation *alloc, u32 block);
void get_next_region(struct block_allocation *alloc);
void get_region(struct block_allocation *alloc, u32 *block, u32 *len);
u32 get_free_blocks(u32 bg);
u32 get_free_inodes(u32 bg);
u32 reserve_inodes(int bg, u32 inodes);
void add_directory(u32 inode);
u16 get_directories(int bg);
u16 get_bg_flags(int bg);
void init_unused_inode_tables(void);
u32 allocate_inode();
void free_alloc(struct block_allocation *alloc);
int reserve_oob_blocks(struct block_allocation *alloc, int blocks);
int advance_blocks(struct block_allocation *alloc, int blocks);
int advance_oob_blocks(struct block_allocation *alloc, int blocks);
int last_region(struct block_allocation *alloc);
void rewind_alloc(struct block_allocation *alloc);
void append_region(struct block_allocation *alloc,
	u32 block, u32 len, int bg);
struct block_allocation *create_allocation();
int append_oob_allocation(struct block_allocation *alloc, u32 len);
void region_list_append(struct region_list *list, struct region *reg);
void region_list_merge(struct region_list *list1, struct region_list *list2);
void print_blocks(FILE* f, struct block_allocation *alloc, char separator);
void reserve_bg_chunk(int bg, u32 start_block, u32 size);
int reserve_blocks_for_allocation(struct block_allocation *alloc);
#endif