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);
}
/*
* write_log
* @lc
*
* Returns: 0 on success, -EIO on failure
*/
static int write_log(struct log_c *lc)
{
struct log_header lh;
size_t bitset_size;
lh.magic = MIRROR_MAGIC;
lh.version = MIRROR_DISK_VERSION;
lh.nr_regions = lc->region_count;
header_to_disk(&lh, lc->disk_buffer);
/* Write disk bits from clean_bits */
bitset_size = lc->region_count / 8;
bitset_size += (lc->region_count % 8) ? 1 : 0;
/* 'lc->clean_bits + 1' becasue dm_bitset_t leads with a uint32_t */
memcpy((char *)lc->disk_buffer + 1024, lc->clean_bits + 1, bitset_size);
if (rw_log(lc, 1)) {
lc->log_dev_failed = 1;
return -EIO; /* Failed disk write */
}
return 0;
}
static int disk_resume(struct dm_dirty_log *log)
{
int r;
unsigned i;
struct log_c *lc = (struct log_c *) log->context;
size_t size = lc->bitset_uint32_count * sizeof(uint32_t);
/* read the disk header */
r = read_header(lc);
if (r) {
DMWARN("%s: Failed to read header on dirty region log device",
lc->log_dev->name);
fail_log_device(lc);
/*
* If the log device cannot be read, we must assume
* all regions are out-of-sync. If we simply return
* here, the state will be uninitialized and could
* lead us to return 'in-sync' status for regions
* that are actually 'out-of-sync'.
*/
lc->header.nr_regions = 0;
}
/* set or clear any new bits -- device has grown */
if (lc->sync == NOSYNC)
for (i = lc->header.nr_regions; i < lc->region_count; i++)
/* FIXME: amazingly inefficient */
log_set_bit(lc, lc->clean_bits, i);
else
for (i = lc->header.nr_regions; i < lc->region_count; i++)
/* FIXME: amazingly inefficient */
log_clear_bit(lc, lc->clean_bits, i);
/* clear any old bits -- device has shrunk */
for (i = lc->region_count; i % (sizeof(*lc->clean_bits) << BYTE_SHIFT); i++)
log_clear_bit(lc, lc->clean_bits, i);
/* copy clean across to sync */
memcpy(lc->sync_bits, lc->clean_bits, size);
lc->sync_count = memweight(lc->clean_bits,
lc->bitset_uint32_count * sizeof(uint32_t));
lc->sync_search = 0;
/* set the correct number of regions in the header */
lc->header.nr_regions = lc->region_count;
header_to_disk(&lc->header, lc->disk_header);
/* write the new header */
r = rw_header(lc, REQ_OP_WRITE);
if (!r) {
r = flush_header(lc);
if (r)
lc->log_dev_flush_failed = 1;
}
if (r) {
DMWARN("%s: Failed to write header on dirty region log device",
lc->log_dev->name);
fail_log_device(lc);
}
return r;
}
static inline int write_header(struct log_c *log)
{
header_to_disk(&log->header, log->disk_header);
return rw_header(log, WRITE);
}