C++ (Cpp) flashcache_dm_io_sync_vm示例

示例#1

文件： flashcache_subr.c 项目： fghaas/flashcache

int
flashcache_read_compute_checksum(struct cache_c *dmc, int index, void *block)
{
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,27)
	struct io_region where;
#else
	struct dm_io_region where;
#endif
	int error;
	u_int64_t sum = 0, *idx;
	int cnt;

	where.bdev = dmc->cache_dev->bdev;
	where.sector = INDEX_TO_CACHE_ADDR(dmc, index);
	where.count = dmc->block_size;
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,27)
	error = flashcache_dm_io_sync_vm(dmc, &where, READ, block);
#else
	error = flashcache_dm_io_sync_vm(dmc, &where, READ, block);
#endif
	if (error)
		return error;
	cnt = dmc->block_size * 512;
	idx = (u_int64_t *)block;
	while (cnt > 0) {
		sum += *idx++;
		cnt -= sizeof(u_int64_t);		
	}
	dmc->cache[index].checksum = sum;
	return 0;
}

示例#2

文件： flashcache_subr.c 项目： psaab/flashcache

int
flashcache_read_compute_checksum(struct cache_c *dmc, int index, void *block)
{
	struct io_region where;
	int error;
	u_int64_t sum = 0, *idx;
	int cnt;

	where.bdev = dmc->cache_dev->bdev;
	where.sector = (index << dmc->block_shift) + dmc->md_sectors;
	where.count = dmc->block_size;
	error = flashcache_dm_io_sync_vm(&where, READ, block);
	if (error)
		return error;
	cnt = dmc->block_size * 512;
	idx = (u_int64_t *)block;
	while (cnt > 0) {
		sum += *idx++;
		cnt -= sizeof(u_int64_t);		
	}
	dmc->cache[index].checksum = sum;
	return 0;
}