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qcow2: Ignore reserved bits in refcount table entries

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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2012-03-16 14:09:08 +01:00
parent 143550a83e
commit 76dc9e0c8f
2 changed files with 3 additions and 1 deletions
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2
block/qcow2-refcount.c
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@ -167,7 +167,7 @@ static int alloc_refcount_block(BlockDriverState *bs,
if (refcount_table_index < s->refcount_table_size) {
uint64_t refcount_block_offset =
s->refcount_table[refcount_table_index];
s->refcount_table[refcount_table_index] & REFT_OFFSET_MASK;
/* If it's already there, we're done */
if (refcount_block_offset) {

2
block/qcow2.h
View File

@ -175,6 +175,8 @@ enum {
#define L2E_OFFSET_MASK 0x00ffffffffffff00ULL
#define L2E_COMPRESSED_OFFSET_SIZE_MASK 0x3fffffffffffffffULL
#define REFT_OFFSET_MASK 0xffffffffffffff00ULL
static inline int size_to_clusters(BDRVQcowState *s, int64_t size)
{
return (size + (s->cluster_size - 1)) >> s->cluster_bits;