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      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.h"
     23 
     24 struct region {
     25 	u32 block;
     26 	u32 len;
     27 	int bg;
     28 	struct region *next;
     29 	struct region *prev;
     30 };
     31 
     32 struct region_list {
     33 	struct region *first;
     34 	struct region *last;
     35 	struct region *iter;
     36 	u32 partial_iter;
     37 };
     38 
     39 struct block_allocation {
     40 	struct region_list list;
     41 	struct region_list oob_list;
     42 	char* filename;
     43 	struct block_allocation* next;
     44 };
     45 
     46 struct 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 
     65 void block_allocator_init();
     66 void block_allocator_free();
     67 u32 allocate_block();
     68 struct block_allocation *allocate_blocks(u32 len);
     69 int block_allocation_num_regions(struct block_allocation *alloc);
     70 int block_allocation_len(struct block_allocation *alloc);
     71 struct ext4_inode *get_inode(u32 inode);
     72 struct ext4_xattr_header *get_xattr_block_for_inode(struct ext4_inode *inode);
     73 void reduce_allocation(struct block_allocation *alloc, u32 len);
     74 u32 get_block(struct block_allocation *alloc, u32 block);
     75 u32 get_oob_block(struct block_allocation *alloc, u32 block);
     76 void get_next_region(struct block_allocation *alloc);
     77 void get_region(struct block_allocation *alloc, u32 *block, u32 *len);
     78 u32 get_free_blocks(u32 bg);
     79 u32 get_free_inodes(u32 bg);
     80 u32 reserve_inodes(int bg, u32 inodes);
     81 void add_directory(u32 inode);
     82 u16 get_directories(int bg);
     83 u16 get_bg_flags(int bg);
     84 void init_unused_inode_tables(void);
     85 u32 allocate_inode();
     86 void free_alloc(struct block_allocation *alloc);
     87 int reserve_oob_blocks(struct block_allocation *alloc, int blocks);
     88 int advance_blocks(struct block_allocation *alloc, int blocks);
     89 int advance_oob_blocks(struct block_allocation *alloc, int blocks);
     90 int last_region(struct block_allocation *alloc);
     91 void rewind_alloc(struct block_allocation *alloc);
     92 void append_region(struct block_allocation *alloc,
     93 	u32 block, u32 len, int bg);
     94 struct block_allocation *create_allocation();
     95 int append_oob_allocation(struct block_allocation *alloc, u32 len);
     96 void region_list_append(struct region_list *list, struct region *reg);
     97 void region_list_merge(struct region_list *list1, struct region_list *list2);
     98 void print_blocks(FILE* f, struct block_allocation *alloc, char separator);
     99 void reserve_bg_chunk(int bg, u32 start_block, u32 size);
    100 int reserve_blocks_for_allocation(struct block_allocation *alloc);
    101 #endif
    102