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authorKevin Wolf <kwolf@redhat.com>2012-12-07 18:08:42 +0100
committerKevin Wolf <kwolf@redhat.com>2012-12-13 15:37:59 +0100
commit1d3afd649bc77aa14bc2741e2da6475822d41c5f (patch)
tree48d6c4f5fb3371a92b9e9c824e133cd121fa808f /block/qcow2.h
parenta7f3d65b65b8c86a5ff0c0abcfefb45e2ec6fe4c (diff)
qcow2: Round QCowL2Meta.offset down to cluster boundary
The offset within the cluster is already present as n_start and this is what the code uses. QCowL2Meta.offset is only needed at a cluster granularity. Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'block/qcow2.h')
-rw-r--r--block/qcow2.h22
1 files changed, 22 insertions, 0 deletions
diff --git a/block/qcow2.h b/block/qcow2.h
index b4eb65470e..2a406a7e83 100644
--- a/block/qcow2.h
+++ b/block/qcow2.h
@@ -199,12 +199,34 @@ struct QCowAIOCB;
/* XXX This could be private for qcow2-cluster.c */
typedef struct QCowL2Meta
{
+ /** Guest offset of the first newly allocated cluster */
uint64_t offset;
+
+ /** Host offset of the first cluster of the request */
uint64_t cluster_offset;
+
+ /** Host offset of the first newly allocated cluster */
uint64_t alloc_offset;
+
+ /**
+ * Number of sectors between the start of the first allocated cluster and
+ * the area that the guest actually writes to.
+ */
int n_start;
+
+ /**
+ * Number of sectors from the start of the first allocated cluster to
+ * the end of the (possibly shortened) request
+ */
int nb_available;
+
+ /** Number of newly allocated clusters */
int nb_clusters;
+
+ /**
+ * Requests that overlap with this allocation and wait to be restarted
+ * when the allocating request has completed.
+ */
CoQueue dependent_requests;
QLIST_ENTRY(QCowL2Meta) next_in_flight;