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qcow2: preserve free_byte_offset when qcow2_alloc_bytes() fails

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When qcow2_alloc_clusters() error handling code was introduced in commit
5d757b563d, the value of free_byte_offset
was clobbered in the error case.  This patch keeps free_byte_offset at 0
so we will try to allocate clusters again next time this function is
called.

Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2012-06-18 14:00:57 +01:00 • committed by Kevin Wolf
parent b35278f754
commit 206e6d8551
1 changed files with 4 additions and 3 deletions
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7
block/qcow2-refcount.c
View file

@ -627,10 +627,11 @@ int64_t qcow2_alloc_bytes(BlockDriverState *bs, int size)
BLKDBG_EVENT(bs->file, BLKDBG_CLUSTER_ALLOC_BYTES);
assert(size > 0 && size <= s->cluster_size);
if (s->free_byte_offset == 0) {
s->free_byte_offset = qcow2_alloc_clusters(bs, s->cluster_size);
if (s->free_byte_offset < 0) {
return s->free_byte_offset;
offset = qcow2_alloc_clusters(bs, s->cluster_size);
if (offset < 0) {
return offset;
}
s->free_byte_offset = offset;
}
redo:
free_in_cluster = s->cluster_size -