65 lines
2.2 KiB

* patch.h --- Common "patch" file functions
* Patch file format:
* 1) sparse data blocks - same size as the patched filesystem, but only changed blocks are written
* 2) updated block bitmap - fs_size/block_size/8 bytes
* 3) 4 byte FS block size
* 4) 8 byte FS size in blocks
* Copyright (c) Vitaliy Filippov <vitalif@mail.ru> 2014
* License: GNU GPLv2 or later
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#ifndef E2_PATCH_H
#define E2_PATCH_H
#include <ext2fs/ext2_fs.h>
#include <ext2fs/ext2fs.h>
#define PATCHBD_MAGIC 0x44623950 // P9bD
struct ext2fs_patch_file
char *patch_file;
int patch_fd;
__u32 block_size;
blk64_t size;
ext2_loff_t offset;
ext2fs_generic_bitmap bmap;
struct patchbd_super
__u32 magic;
__u32 patch_block;
__u64 patch_size;
errcode_t retry_read(int fd, ssize_t size, void *buf);
errcode_t retry_write(int fd, ssize_t size, const void *buf);
errcode_t retry_read_at(int fd, unsigned long long offset, ssize_t size, void *buf);
errcode_t retry_write_at(int fd, unsigned long long offset, ssize_t size, const void *buf);
errcode_t ext2fs_patch_read_bmap(struct ext2fs_patch_file *data);
errcode_t ext2fs_patch_write_bmap(struct ext2fs_patch_file *data);
errcode_t ext2fs_patch_open(struct ext2fs_patch_file *data, char *patch_file, int flags);
errcode_t ext2fs_patch_close(struct ext2fs_patch_file *data);
errcode_t ext2fs_patch_init_bmap(struct ext2fs_patch_file *data, io_channel channel);
errcode_t ext2fs_patch_write_blk64(struct ext2fs_patch_file *data, unsigned long long block, int count, const void *buf);