C++ (Cpp) dm_io_sync_vm Examples

Example #1

File: dm-log.c Project: FatSunHYS/OSCourseDesign

static int read_header(struct log_c *log)
{
	int r;
	unsigned long ebits;

	r = dm_io_sync_vm(1, &log->header_location, READ,
			  log->disk_header, &ebits);
	if (r)
		return r;

	header_from_disk(&log->header, log->disk_header);

	/* New log required? */
	if (log->sync != DEFAULTSYNC || log->header.magic != MIRROR_MAGIC) {
		log->header.magic = MIRROR_MAGIC;
		log->header.version = MIRROR_DISK_VERSION;
		log->header.nr_regions = 0;
	}

#ifdef __LITTLE_ENDIAN
	if (log->header.version == 1)
		log->header.version = 2;
#endif

	if (log->header.version != MIRROR_DISK_VERSION) {
		DMWARN("incompatible disk log version");
		return -EINVAL;
	}

	return 0;
}

Example #2

File: dm-log.c Project: FatSunHYS/OSCourseDesign

static inline int write_header(struct log_c *log)
{
	unsigned long ebits;

	header_to_disk(&log->header, log->disk_header);
	return dm_io_sync_vm(1, &log->header_location, WRITE,
			     log->disk_header, &ebits);
}

Example #3

File: dm-log.c Project: Antonio-Zhou/Linux-2.6.11

static int write_bits(struct log_c *log)
{
	unsigned long ebits;
	bits_to_disk(log->clean_bits, log->disk_bits,
		     log->bitset_uint32_count);
	return dm_io_sync_vm(1, &log->bits_location, WRITE,
			     log->disk_bits, &ebits);
}

Example #4

File: dm-log.c Project: Antonio-Zhou/Linux-2.6.11

static int read_bits(struct log_c *log)
{
	int r;
	unsigned long ebits;

	r = dm_io_sync_vm(1, &log->bits_location, READ,
			  log->disk_bits, &ebits);
	if (r)
		return r;

	bits_to_core(log->clean_bits, log->disk_bits,
		     log->bitset_uint32_count);
	return 0;
}