Patchwork [RFC,V7,30/32] qcow2: Add qcow2_dedup_init and qcow2_dedup_close.

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Submitter Benoît Canet
Date March 15, 2013, 2:49 p.m.
Message ID <1363358986-8360-31-git-send-email-benoit@irqsave.net>
Download mbox | patch
Permalink /patch/228038/
State New
Headers show

Comments

Benoît Canet - March 15, 2013, 2:49 p.m.
Signed-off-by: Benoit Canet <benoit@irqsave.net>
---
 block/qcow2-dedup.c |   78 +++++++++++++++++++++++++++++++++++++++++++++++++++
 block/qcow2.h       |    2 ++
 2 files changed, 80 insertions(+)

Patch

diff --git a/block/qcow2-dedup.c b/block/qcow2-dedup.c
index 6ad9d0c..c2dd145 100644
--- a/block/qcow2-dedup.c
+++ b/block/qcow2-dedup.c
@@ -1091,3 +1091,81 @@  bool qcow2_dedup_is_running(BlockDriverState *bs)
     BDRVQcowState *s = bs->opaque;
     return s->has_dedup && s->dedup_status == DEDUP_STATUS_STARTED;
 }
+
+static gint qcow2_dedup_compare_by_hash(gconstpointer a,
+                                        gconstpointer b,
+                                        gpointer data)
+{
+    QCowHash *hash_a = (QCowHash *) a;
+    QCowHash *hash_b = (QCowHash *) b;
+    return memcmp(hash_a->data, hash_b->data, HASH_LENGTH);
+}
+
+static void qcow2_dedup_destroy_qcow_hash_node(gpointer p)
+{
+    QCowHashNode *hash_node = (QCowHashNode *) p;
+    g_free(hash_node);
+}
+
+static int qcow2_dedup_alloc(BlockDriverState *bs)
+{
+    BDRVQcowState *s = bs->opaque;
+    int ret;
+
+    ret = qcow2_do_table_init(bs,
+                              &s->dedup_table,
+                              s->dedup_table_offset,
+                              s->dedup_table_size,
+                              false);
+
+    if (ret < 0) {
+        return ret;
+    }
+
+    s->dedup_tree_by_hash = g_tree_new_full(qcow2_dedup_compare_by_hash, NULL,
+                                            NULL,
+                                            qcow2_dedup_destroy_qcow_hash_node);
+
+    s->dedup_cluster_cache = qcow2_cache_create(bs, DEDUP_CACHE_SIZE,
+                                                s->hash_block_size);
+
+    return 0;
+}
+
+static void qcow2_dedup_free(BlockDriverState *bs)
+{
+    BDRVQcowState *s = bs->opaque;
+    g_free(s->dedup_table);
+
+    qcow2_cache_flush(bs, s->dedup_cluster_cache);
+    qcow2_cache_destroy(bs, s->dedup_cluster_cache);
+    g_tree_destroy(s->dedup_tree_by_hash);
+}
+
+int qcow2_dedup_init(BlockDriverState *bs)
+{
+    BDRVQcowState *s = bs->opaque;
+    int ret = 0;
+
+    s->has_dedup = true;
+
+    ret = qcow2_dedup_alloc(bs);
+
+    if (ret < 0) {
+        return ret;
+    }
+
+    /* if we are read-only we don't load the deduplication table */
+    if (bs->read_only) {
+        return 0;
+    }
+
+    s->dedup_status = DEDUP_STATUS_STARTING;
+
+    return 0;
+}
+
+void qcow2_dedup_close(BlockDriverState *bs)
+{
+    qcow2_dedup_free(bs);
+}
diff --git a/block/qcow2.h b/block/qcow2.h
index a430fe1..9275be1 100644
--- a/block/qcow2.h
+++ b/block/qcow2.h
@@ -500,5 +500,7 @@  int qcow2_dedup_store_new_hashes(BlockDriverState *bs,
 void qcow2_dedup_destroy_hash(BlockDriverState *bs,
                               uint64_t cluster_index);
 bool qcow2_dedup_is_running(BlockDriverState *bs);
+int qcow2_dedup_init(BlockDriverState *bs);
+void qcow2_dedup_close(BlockDriverState *bs);
 
 #endif