diff mbox series

[v9,11/34] qcow2: Add offset_into_subcluster() and size_to_subclusters()

Message ID 980aaffef450241ffe683e387e9c3a0cf516a7ba.1593342067.git.berto@igalia.com
State New
Headers show
Series Add subcluster allocation to qcow2 | expand

Commit Message

Alberto Garcia June 28, 2020, 11:02 a.m. UTC 
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>
---
 block/qcow2.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

Comments

Max Reitz July 1, 2020, 12:23 p.m. UTC | #1 
On 28.06.20 13:02, Alberto Garcia wrote:
> 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>
> ---
>  block/qcow2.h | 10 ++++++++++
>  1 file changed, 10 insertions(+)

Reviewed-by: Max Reitz <mreitz@redhat.com>
diff mbox series

Patch

diff --git a/block/qcow2.h b/block/qcow2.h
index 2503374677..4fe31adfd3 100644
--- a/block/qcow2.h
+++ b/block/qcow2.h
@@ -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;