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