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Fix compressed qcow2 (Gleb Natapov)

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Correctly calculate number of contiguous clusters.

Acked-by: Kevin Wolf <kwolf@suse.de>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>



git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6212 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
aliguori 2009-01-07 16:43:13 +00:00
parent 181a29c5b2
commit ab5ccbd65d
1 changed files with 9 additions and 6 deletions
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15
block-qcow2.c
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@ -620,6 +620,9 @@ static int count_contiguous_clusters(uint64_t nb_clusters, int cluster_size,
int i;
uint64_t offset = be64_to_cpu(l2_table[0]) & ~mask;
if (!offset)
return 0;
for (i = 0; i < nb_clusters; i++)
if (offset + i * cluster_size != (be64_to_cpu(l2_table[i]) & ~mask))
break;
@ -981,6 +984,12 @@ static uint64_t alloc_cluster_offset(BlockDriverState *bs,
/* how many available clusters ? */
while (i < nb_clusters) {
i += count_contiguous_clusters(nb_clusters - i, s->cluster_size,
&l2_table[l2_index + i], 0);
if(be64_to_cpu(l2_table[l2_index + i]))
break;
i += count_contiguous_free_clusters(nb_clusters - i,
&l2_table[l2_index + i]);
@ -989,12 +998,6 @@ static uint64_t alloc_cluster_offset(BlockDriverState *bs,
if ((cluster_offset & QCOW_OFLAG_COPIED) ||
(cluster_offset & QCOW_OFLAG_COMPRESSED))
break;
i += count_contiguous_clusters(nb_clusters - i, s->cluster_size,
&l2_table[l2_index + i], 0);
if(be64_to_cpu(l2_table[l2_index + i]))
break;
}
nb_clusters = i;