OpenE2K
/
qemu-e2k
13
4
Fork 0
Code Issues 4 Pull Requests Projects 2 Releases Activity

qcow2: Decouple cluster allocation from cluster reuse code 

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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

35
block/qcow2-cluster.c
View File

@ -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;