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qcow2: Decouple cluster allocation from cluster reuse code

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This moves some code that prepares the allocation of new clusters to
where the actual allocation happens. This is the minimum required to be
able to move it to a separate function in the next patch.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Kevin Wolf 2013-03-26 17:49:59 +01:00 committed by Stefan Hajnoczi
parent 65eb2e35c0
commit 037689d896
1 changed files with 20 additions and 15 deletions
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35
block/qcow2-cluster.c
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@ -946,10 +946,7 @@ again:
cluster_offset = be64_to_cpu(l2_table[l2_index]);
/*
* Check how many clusters are already allocated and don't need COW, and how
* many need a new allocation.
*/
/* Check how many clusters are already allocated and don't need COW */
if (qcow2_get_cluster_type(cluster_offset) == QCOW2_CLUSTER_NORMAL
&& (cluster_offset & QCOW_OFLAG_COPIED))
{
@ -965,17 +962,6 @@ again:
cluster_offset = 0;
}
if (nb_clusters > 0) {
/* For the moment, overwrite compressed clusters one by one */
uint64_t entry = be64_to_cpu(l2_table[l2_index + keep_clusters]);
if (entry & QCOW_OFLAG_COMPRESSED) {
nb_clusters = 1;
} else {
nb_clusters = count_cow_clusters(s, nb_clusters, l2_table,
l2_index + keep_clusters);
}
}
cluster_offset &= L2E_OFFSET_MASK;
/*
@ -996,6 +982,25 @@ again:
uint64_t alloc_cluster_offset;
uint64_t keep_bytes = keep_clusters * s->cluster_size;
ret = get_cluster_table(bs, offset, &l2_table, &l2_index);
if (ret < 0) {
return ret;
}
/* For the moment, overwrite compressed clusters one by one */
uint64_t entry = be64_to_cpu(l2_table[l2_index + keep_clusters]);
if (entry & QCOW_OFLAG_COMPRESSED) {
nb_clusters = 1;
} else {
nb_clusters = count_cow_clusters(s, nb_clusters, l2_table,
l2_index + keep_clusters);
}
ret = qcow2_cache_put(bs, s->l2_table_cache, (void**) &l2_table);
if (ret < 0) {
return ret;
}
/* Calculate start and size of allocation */
alloc_offset = offset + keep_bytes;