qcow2: Reduce number of I/O requests

[qemu.git] / block / qcow2.h

diff --git a/block/qcow2.h b/block/qcow2.h
index fc358381756a93dbeb951800330f7f41d46b8b28..e4ac366cfcfbb3ac45b0edb26add23a91241a678 100644 (file)
--- a/block/qcow2.h
+++ b/block/qcow2.h
@@ -155,6 +155,7 @@ typedef struct QCowL2Meta
 {
     uint64_t offset;
     uint64_t cluster_offset;
+    uint64_t alloc_offset;
     int n_start;
     int nb_available;
     int nb_clusters;
@@ -193,6 +194,8 @@ int qcow2_refcount_init(BlockDriverState *bs);
 void qcow2_refcount_close(BlockDriverState *bs);
 
 int64_t qcow2_alloc_clusters(BlockDriverState *bs, int64_t size);
+int qcow2_alloc_clusters_at(BlockDriverState *bs, uint64_t offset,
+    int nb_clusters);
 int64_t qcow2_alloc_bytes(BlockDriverState *bs, int size);
 void qcow2_free_clusters(BlockDriverState *bs,
     int64_t offset, int64_t size);