[Qemu-devel] [RFC V2 19/20] qcow2: init and cleanup deduplication.

["Benoît Canet" <benoit@irqsave.net>]

---
 block/qcow2-dedup.c |   34 +++++++++++++++++++++++++++++-----
 block/qcow2.c       |   16 +++++++++++++---
 2 files changed, 42 insertions(+), 8 deletions(-)

diff --git a/block/qcow2-dedup.c b/block/qcow2-dedup.c
index 60e93fe..d19bf8c 100644
--- a/block/qcow2-dedup.c
+++ b/block/qcow2-dedup.c
@@ -736,15 +736,39 @@ int qcow2_dedup_grow_table(BlockDriverState *bs,
 int qcow2_dedup_init(BlockDriverState *bs)
 {
     BDRVQcowState *s = bs->opaque;
-    return qcow2_do_table_init(bs,
-                               &s->dedup_table,
-                               s->dedup_table_offset,
-                               s->dedup_table_size,
-                               false);
+    Coroutine *co;
+    int ret;
+
+    s->has_dedup = true;
+    s->dedup_rb_tree = RB_ROOT;
+    QTAILQ_INIT(&s->undedupable_hashes);
+    s->dedup_cluster_cache = qcow2_cache_create(bs, DEDUP_CACHE_SIZE);
+
+    ret = qcow2_do_table_init(bs,
+                              &s->dedup_table,
+                              s->dedup_table_offset,
+                              s->dedup_table_size,
+                              false);
+
+    if (ret < 0) {
+        goto fail;
+    }
+
+    /* load asynchronously the hashes */
+    co = qemu_coroutine_create(qcow2_co_load_dedup_hashes);
+    qemu_coroutine_enter(co, bs);
+    return 0;
+
+fail:
+    qcow2_cache_destroy(bs, s->dedup_cluster_cache);
+    return ret;
 }
 
 void qcow2_dedup_close(BlockDriverState *bs)
 {
     BDRVQcowState *s = bs->opaque;
+    qcow2_cache_flush(bs, s->dedup_cluster_cache);
+    qcow2_cache_destroy(bs, s->dedup_cluster_cache);
     g_free(s->dedup_table);
+    qcow2_dedup_destroy_rb_tree(bs);
 }
diff --git a/block/qcow2.c b/block/qcow2.c
index e0c1a68..4102cf8 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -534,6 +534,13 @@ static int qcow2_open(BlockDriverState *bs, int flags)
         }
     }
 
+    if (s->incompatible_features & QCOW2_INCOMPAT_DEDUP) {
+        ret = qcow2_dedup_init(bs);
+        if (ret < 0) {
+            goto fail;
+        }
+    }
+
 #ifdef DEBUG_ALLOC
     {
         BdrvCheckResult result = {0};
@@ -991,11 +998,11 @@ fail:
 static void qcow2_close(BlockDriverState *bs)
 {
     BDRVQcowState *s = bs->opaque;
+
     g_free(s->l1_table);
 
     if (s->has_dedup) {
-        qcow2_cache_flush(bs, s->dedup_cluster_cache);
-        qcow2_cache_destroy(bs, s->dedup_cluster_cache);
+        qcow2_dedup_close(bs);
     }
 
     qcow2_cache_flush(bs, s->l2_table_cache);
@@ -1444,7 +1451,10 @@ static int qcow2_create2(const char *filename, int64_t total_size,
         }
 
         /* minimal init */
-        s->dedup_cluster_cache = qcow2_cache_create(bs, DEDUP_CACHE_SIZE);
+        ret = qcow2_dedup_init(bs);
+        if (ret < 0) {
+            goto out;
+        }
     }
 
     /* Want a backing file? There you go.*/
-- 
1.7.10.4