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