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[Qemu-devel] [PATCH v4 3/5] qcow2: Save refcount order in BDRVQcowState
From: |
Max Reitz |
Subject: |
[Qemu-devel] [PATCH v4 3/5] qcow2: Save refcount order in BDRVQcowState |
Date: |
Mon, 2 Sep 2013 12:04:04 +0200 |
Save the image refcount order in BDRVQcowState. This will be relevant
for future code supporting different refcount orders than four and also
for code that needs to verify a certain refcount order for an opened
image.
Signed-off-by: Max Reitz <address@hidden>
---
block/qcow2.c | 3 ++-
block/qcow2.h | 1 +
2 files changed, 3 insertions(+), 1 deletion(-)
diff --git a/block/qcow2.c b/block/qcow2.c
index aeb2ebb..28b104e 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -455,6 +455,7 @@ static int qcow2_open(BlockDriverState *bs, QDict *options,
int flags)
ret = -ENOTSUP;
goto fail;
}
+ s->refcount_order = header.refcount_order;
if (header.cluster_bits < MIN_CLUSTER_BITS ||
header.cluster_bits > MAX_CLUSTER_BITS) {
@@ -1133,7 +1134,7 @@ int qcow2_update_header(BlockDriverState *bs)
.incompatible_features = cpu_to_be64(s->incompatible_features),
.compatible_features = cpu_to_be64(s->compatible_features),
.autoclear_features = cpu_to_be64(s->autoclear_features),
- .refcount_order = cpu_to_be32(3 + REFCOUNT_SHIFT),
+ .refcount_order = cpu_to_be32(s->refcount_order),
.header_length = cpu_to_be32(header_length),
};
diff --git a/block/qcow2.h b/block/qcow2.h
index 25176ac..b070709 100644
--- a/block/qcow2.h
+++ b/block/qcow2.h
@@ -199,6 +199,7 @@ typedef struct BDRVQcowState {
int flags;
int qcow_version;
bool use_lazy_refcounts;
+ int refcount_order;
bool discard_passthrough[QCOW2_DISCARD_MAX];
--
1.8.3.1