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qcow2: Simplify calculation for COW area at the end 

copy_sectors() always uses the sum (cluster_offset + n_start) or
(start_sect + n_start), so if some value is added to both cluster_offset
and start_sect, and subtracted from n_start, it's cancelled out anyway.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2012-05-22 16:58:48 +02:00
parent 6af4e9ead4
commit cdba7fee1d
1 changed files with 2 additions and 3 deletions
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5
block/qcow2-cluster.c
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@ -642,11 +642,10 @@ int qcow2_alloc_cluster_link_l2(BlockDriverState *bs, QCowL2Meta *m)
}
if (m->nb_available & (s->cluster_sectors - 1)) {
uint64_t end = m->nb_available & ~(uint64_t)(s->cluster_sectors - 1);
cow = true;
qemu_co_mutex_unlock(&s->lock);
ret = copy_sectors(bs, start_sect + end, cluster_offset + (end << 9),
m->nb_available - end, s->cluster_sectors);
ret = copy_sectors(bs, start_sect, cluster_offset, m->nb_available,
align_offset(m->nb_available, s->cluster_sectors));
qemu_co_mutex_lock(&s->lock);
if (ret < 0)
goto err;