1/*
2 * Copyright (C) 2010 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *	  http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef _ALLOCATE_H_
18#define _ALLOCATE_H_
19
20#define EXT4_ALLOCATE_FAILED (u32)(~0)
21
22#include "ext4_utils/ext4_utils.h"
23
24struct region {
25	u32 block;
26	u32 len;
27	int bg;
28	struct region *next;
29	struct region *prev;
30};
31
32struct region_list {
33	struct region *first;
34	struct region *last;
35	struct region *iter;
36	u32 partial_iter;
37};
38
39struct block_allocation {
40	struct region_list list;
41	struct region_list oob_list;
42	char* filename;
43	struct block_allocation* next;
44};
45
46struct block_group_info {
47	u32 first_block;
48	int header_blocks;
49	int data_blocks_used;
50	int has_superblock;
51	u8 *bitmaps;
52	u8 *block_bitmap;
53	u8 *inode_bitmap;
54	u8 *inode_table;
55	u32 free_blocks;
56	u32 free_inodes;
57	u32 first_free_inode;
58	u16 flags;
59	u16 used_dirs;
60	int chunk_count;
61	int max_chunk_count;
62	struct region *chunks;
63};
64
65void block_allocator_init();
66void block_allocator_free();
67u32 allocate_block();
68struct block_allocation *allocate_blocks(u32 len);
69int block_allocation_num_regions(struct block_allocation *alloc);
70int block_allocation_len(struct block_allocation *alloc);
71struct ext4_inode *get_inode(u32 inode);
72struct ext4_xattr_header *get_xattr_block_for_inode(struct ext4_inode *inode);
73void reduce_allocation(struct block_allocation *alloc, u32 len);
74u32 get_block(struct block_allocation *alloc, u32 block);
75u32 get_oob_block(struct block_allocation *alloc, u32 block);
76void get_next_region(struct block_allocation *alloc);
77void get_region(struct block_allocation *alloc, u32 *block, u32 *len);
78u32 get_free_blocks(u32 bg);
79u32 get_free_inodes(u32 bg);
80u32 reserve_inodes(int bg, u32 inodes);
81void add_directory(u32 inode);
82u16 get_directories(int bg);
83u16 get_bg_flags(int bg);
84void init_unused_inode_tables(void);
85u32 allocate_inode();
86void free_alloc(struct block_allocation *alloc);
87int reserve_oob_blocks(struct block_allocation *alloc, int blocks);
88int advance_blocks(struct block_allocation *alloc, int blocks);
89int advance_oob_blocks(struct block_allocation *alloc, int blocks);
90int last_region(struct block_allocation *alloc);
91void rewind_alloc(struct block_allocation *alloc);
92void append_region(struct block_allocation *alloc,
93	u32 block, u32 len, int bg);
94struct block_allocation *create_allocation();
95int append_oob_allocation(struct block_allocation *alloc, u32 len);
96void region_list_append(struct region_list *list, struct region *reg);
97void region_list_merge(struct region_list *list1, struct region_list *list2);
98void print_blocks(FILE* f, struct block_allocation *alloc, char separator);
99void reserve_bg_chunk(int bg, u32 start_block, u32 size);
100int reserve_blocks_for_allocation(struct block_allocation *alloc);
101#endif
102