From d0346b5591825bab4d4b35aefb0ab0d7650e3641 Mon Sep 17 00:00:00 2001 From: Alberto Garcia Date: Fri, 10 Jul 2020 18:12:51 +0200 Subject: qcow2: Add subcluster-related fields to BDRVQcow2State This patch adds the following new fields to BDRVQcow2State: - subclusters_per_cluster: Number of subclusters in a cluster - subcluster_size: The size of each subcluster, in bytes - subcluster_bits: No. of bits so 1 << subcluster_bits = subcluster_size Images without subclusters are treated as if they had exactly one subcluster per cluster (i.e. subcluster_size = cluster_size). Signed-off-by: Alberto Garcia Reviewed-by: Max Reitz Reviewed-by: Vladimir Sementsov-Ogievskiy Message-Id: <55bfeac86b092fa2c9d182a95cbeb479ff7eca4f.1594396418.git.berto@igalia.com> Signed-off-by: Max Reitz --- block/qcow2.h | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'block/qcow2.h') diff --git a/block/qcow2.h b/block/qcow2.h index 2064dd3d85..eee4c8de9c 100644 --- a/block/qcow2.h +++ b/block/qcow2.h @@ -78,6 +78,8 @@ /* The cluster reads as all zeros */ #define QCOW_OFLAG_ZERO (1ULL << 0) +#define QCOW_EXTL2_SUBCLUSTERS_PER_CLUSTER 32 + #define MIN_CLUSTER_BITS 9 #define MAX_CLUSTER_BITS 21 @@ -295,6 +297,9 @@ typedef struct BDRVQcow2State { int cluster_bits; int cluster_size; int l2_slice_size; + int subcluster_bits; + int subcluster_size; + int subclusters_per_cluster; int l2_bits; int l2_size; int l1_size; -- cgit v1.2.3