[RFC PATCH v2 01/26] qcow2: Add calculate_l2_meta()

[Alberto Garcia <berto@igalia.com>]

handle_alloc() creates a QCowL2Meta structure in order to update the
image metadata and perform the necessary copy-on-write operations.

This patch moves that code to a separate function so it can be used
from other places.

Signed-off-by: Alberto Garcia <berto@igalia.com>
---
 block/qcow2-cluster.c | 76 +++++++++++++++++++++++++++++--------------
 1 file changed, 52 insertions(+), 24 deletions(-)

diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c
index 8982b7b762..6c1dcdc781 100644
--- a/block/qcow2-cluster.c
+++ b/block/qcow2-cluster.c
@@ -1019,6 +1019,55 @@ void qcow2_alloc_cluster_abort(BlockDriverState *bs, QCowL2Meta *m)
                         QCOW2_DISCARD_NEVER);
 }
 
+/*
+ * For a given write request, create a new QCowL2Meta structure and
+ * add it to @m.
+ *
+ * @host_offset points to the beginning of the first cluster.
+ *
+ * @guest_offset and @bytes indicate the offset and length of the
+ * request.
+ *
+ * If @keep_old is true it means that the clusters were already
+ * allocated and will be overwritten. If false then the clusters are
+ * new and we have to decrease the reference count of the old ones.
+ */
+static void calculate_l2_meta(BlockDriverState *bs, uint64_t host_offset,
+                              uint64_t guest_offset, uint64_t bytes,
+                              QCowL2Meta **m, bool keep_old)
+{
+    BDRVQcow2State *s = bs->opaque;
+    unsigned cow_start_from = 0;
+    unsigned cow_start_to = offset_into_cluster(s, guest_offset);
+    unsigned cow_end_from = cow_start_to + bytes;
+    unsigned cow_end_to = ROUND_UP(cow_end_from, s->cluster_size);
+    unsigned nb_clusters = size_to_clusters(s, cow_end_from);
+    QCowL2Meta *old_m = *m;
+
+    *m = g_malloc0(sizeof(**m));
+    **m = (QCowL2Meta) {
+        .next           = old_m,
+
+        .alloc_offset   = host_offset,
+        .offset         = start_of_cluster(s, guest_offset),
+        .nb_clusters    = nb_clusters,
+
+        .keep_old_clusters = keep_old,
+
+        .cow_start = {
+            .offset     = cow_start_from,
+            .nb_bytes   = cow_start_to - cow_start_from,
+        },
+        .cow_end = {
+            .offset     = cow_end_from,
+            .nb_bytes   = cow_end_to - cow_end_from,
+        },
+    };
+
+    qemu_co_queue_init(&(*m)->dependent_requests);
+    QLIST_INSERT_HEAD(&s->cluster_allocs, *m, next_in_flight);
+}
+
 /*
  * Returns the number of contiguous clusters that can be used for an allocating
  * write, but require COW to be performed (this includes yet unallocated space,
@@ -1417,35 +1466,14 @@ static int handle_alloc(BlockDriverState *bs, uint64_t guest_offset,
     uint64_t requested_bytes = *bytes + offset_into_cluster(s, guest_offset);
     int avail_bytes = nb_clusters << s->cluster_bits;
     int nb_bytes = MIN(requested_bytes, avail_bytes);
-    QCowL2Meta *old_m = *m;
-
-    *m = g_malloc0(sizeof(**m));
-
-    **m = (QCowL2Meta) {
-        .next           = old_m,
-
-        .alloc_offset   = alloc_cluster_offset,
-        .offset         = start_of_cluster(s, guest_offset),
-        .nb_clusters    = nb_clusters,
-
-        .keep_old_clusters  = keep_old_clusters,
-
-        .cow_start = {
-            .offset     = 0,
-            .nb_bytes   = offset_into_cluster(s, guest_offset),
-        },
-        .cow_end = {
-            .offset     = nb_bytes,
-            .nb_bytes   = avail_bytes - nb_bytes,
-        },
-    };
-    qemu_co_queue_init(&(*m)->dependent_requests);
-    QLIST_INSERT_HEAD(&s->cluster_allocs, *m, next_in_flight);
 
     *host_offset = alloc_cluster_offset + offset_into_cluster(s, guest_offset);
     *bytes = MIN(*bytes, nb_bytes - offset_into_cluster(s, guest_offset));
     assert(*bytes != 0);
 
+    calculate_l2_meta(bs, alloc_cluster_offset, guest_offset, *bytes,
+                      m, keep_old_clusters);
+
     return 1;
 
 fail:
-- 
2.20.1