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/*
* Copyright (C) 2014 John Crispin <blogic@openwrt.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 2.1
* as published by the Free Software Foundation
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#ifndef _SNAPSHOT_H__
#define _SNAPSHOT_H__
#define PATH_MAX 256
#define OWRT 0x4f575254
#define DATA 0x44415441
#define CONF 0x434f4e46
struct file_header {
uint32_t magic;
uint32_t type;
uint32_t seq;
uint32_t length;
uint32_t md5[4];
};
static inline int
is_config(struct file_header *h)
{
return ((h->magic == OWRT) && (h->type == CONF));
}
static inline int
valid_file_size(int fs)
{
if ((fs > 8 * 1024 * 1204) || (fs <= 0))
return -1;
return 0;
}
static inline void
hdr_to_be32(struct file_header *hdr)
{
uint32_t *h = (uint32_t *) hdr;
int i;
for (i = 0; i < sizeof(struct file_header) / sizeof(uint32_t); i++)
h[i] = cpu_to_be32(h[i]);
}
static inline void
be32_to_hdr(struct file_header *hdr)
{
uint32_t *h = (uint32_t *) hdr;
int i;
for (i = 0; i < sizeof(struct file_header) / sizeof(uint32_t); i++)
h[i] = be32_to_cpu(h[i]);
}
static inline int
pad_file_size(struct volume *v, int size)
{
int mod;
size += sizeof(struct file_header);
mod = size % v->block_size;
if (mod) {
size -= mod;
size += v->block_size;
}
return size;
}
int verify_file_hash(char *file, uint32_t *hash);
int snapshot_next_free(struct volume *v, uint32_t *seq);
int config_find(struct volume *v, struct file_header *conf, struct file_header *sentinel);
int snapshot_write_file(struct volume *v, int block, char *file, uint32_t seq, uint32_t type);
int snapshot_read_file(struct volume *v, int block, char *file, uint32_t type);
int sentinel_write(struct volume *v, uint32_t _seq);
int volatile_write(struct volume *v, uint32_t _seq);
#endif
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