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qcow2: Add offset_into_subcluster() and size_to_subclusters() 

Like offset_into_cluster() and size_to_clusters(), but for
subclusters.

Signed-off-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-Id: <3cc2390dcdef3d234d47c741b708bd8734490862.1594396418.git.berto@igalia.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Alberto Garcia 2020-07-10 18:12:53 +02:00 committed by Max Reitz
parent a53e8b7202
commit 3e71981592
1 changed files with 10 additions and 0 deletions
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10
block/qcow2.h
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@ -555,11 +555,21 @@ static inline int64_t offset_into_cluster(BDRVQcow2State *s, int64_t offset)
return offset & (s->cluster_size - 1);
}
static inline int64_t offset_into_subcluster(BDRVQcow2State *s, int64_t offset)
{
return offset & (s->subcluster_size - 1);
}
static inline uint64_t size_to_clusters(BDRVQcow2State *s, uint64_t size)
{
return (size + (s->cluster_size - 1)) >> s->cluster_bits;
}
static inline uint64_t size_to_subclusters(BDRVQcow2State *s, uint64_t size)
{
return (size + (s->subcluster_size - 1)) >> s->subcluster_bits;
}
static inline int64_t size_to_l1(BDRVQcow2State *s, int64_t size)
{
int shift = s->cluster_bits + s->l2_bits;