[Qemu-devel] [RFC V7 29/32] qcow: Set large dedup hash block size.

[Benoît Canet]

Signed-off-by: Benoit Canet <address@hidden>
---
 block/qcow2-refcount.c |    5 +++--
 block/qcow2.c          |    3 +++
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/block/qcow2-refcount.c b/block/qcow2-refcount.c
index 58d142f..7e74896 100644
--- a/block/qcow2-refcount.c
+++ b/block/qcow2-refcount.c
@@ -1095,7 +1095,7 @@ static int check_dedup_l2(BlockDriverState *bs, 
BdrvCheckResult *res,
     int i, l2_size;
 
     /* Read L2 table from disk */
-    l2_size = s->cluster_size;
+    l2_size = s->hash_block_size;
     l2_table = g_malloc(l2_size);
 
     if (bdrv_pread(bs->file, l2_offset, l2_table, l2_size) != l2_size) {
@@ -1185,7 +1185,8 @@ static int check_refcounts_l1(BlockDriverState *bs,
             /* Mark L2 table as used */
             l2_offset &= L1E_OFFSET_MASK;
             inc_refcounts(bs, res, refcount_table, refcount_table_size,
-                l2_offset, s->cluster_size);
+                l2_offset,
+                dedup ? s->hash_block_size : s->l2_size * sizeof(uint64_t));
 
             /* L2 tables are cluster aligned */
             if (l2_offset & (s->cluster_size - 1)) {
diff --git a/block/qcow2.c b/block/qcow2.c
index 17b2fcb..96fc86a 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -426,6 +426,9 @@ static int qcow2_open(BlockDriverState *bs, int flags)
     s->cluster_sectors = 1 << (s->cluster_bits - 9);
     s->l2_bits = s->cluster_bits - 3; /* L2 is always one cluster */
     s->l2_size = 1 << s->l2_bits;
+    if (s->incompatible_features & QCOW2_INCOMPAT_DEDUP) {
+        s->hash_block_size = DEFAULT_CLUSTER_SIZE * 5;
+    }
     bs->total_sectors = header.size / 512;
     s->csize_shift = (62 - (s->cluster_bits - 8));
     s->csize_mask = (1 << (s->cluster_bits - 8)) - 1;
-- 
1.7.10.4