diff mbox

[14/17] qmp: add x-debug-block-dirty-bitmap-sha256

Message ID 1486979689-230770-15-git-send-email-vsementsov@virtuozzo.com
State New
Headers show

Commit Message

Vladimir Sementsov-Ogievskiy Feb. 13, 2017, 9:54 a.m. UTC 
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
---
 block/dirty-bitmap.c         |  5 +++++
 blockdev.c                   | 29 +++++++++++++++++++++++++++++
 include/block/dirty-bitmap.h |  2 ++
 include/qemu/hbitmap.h       |  8 ++++++++
 qapi/block-core.json         | 27 +++++++++++++++++++++++++++
 tests/Makefile.include       |  2 +-
 util/hbitmap.c               | 11 +++++++++++
 7 files changed, 83 insertions(+), 1 deletion(-)

Comments

John Snow Feb. 16, 2017, 12:35 a.m. UTC | #1 
On 02/13/2017 04:54 AM, Vladimir Sementsov-Ogievskiy wrote:
> Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
> Reviewed-by: Max Reitz <mreitz@redhat.com>

This is simply the same as the version in the other two series, right?

Reviewed-by: John Snow <jsnow@redhat.com>

> ---
>  block/dirty-bitmap.c         |  5 +++++
>  blockdev.c                   | 29 +++++++++++++++++++++++++++++
>  include/block/dirty-bitmap.h |  2 ++
>  include/qemu/hbitmap.h       |  8 ++++++++
>  qapi/block-core.json         | 27 +++++++++++++++++++++++++++
>  tests/Makefile.include       |  2 +-
>  util/hbitmap.c               | 11 +++++++++++
>  7 files changed, 83 insertions(+), 1 deletion(-)
> 
> diff --git a/block/dirty-bitmap.c b/block/dirty-bitmap.c
> index 32aa6eb..5bec99b 100644
> --- a/block/dirty-bitmap.c
> +++ b/block/dirty-bitmap.c
> @@ -558,3 +558,8 @@ BdrvDirtyBitmap *bdrv_next_dirty_bitmap(BlockDriverState *bs,
>  
>      return QLIST_NEXT(bitmap, list);
>  }
> +
> +char *bdrv_dirty_bitmap_sha256(const BdrvDirtyBitmap *bitmap, Error **errp)
> +{
> +    return hbitmap_sha256(bitmap->bitmap, errp);
> +}
> diff --git a/blockdev.c b/blockdev.c
> index db82ac9..4d06885 100644
> --- a/blockdev.c
> +++ b/blockdev.c
> @@ -2790,6 +2790,35 @@ void qmp_block_dirty_bitmap_clear(const char *node, const char *name,
>      aio_context_release(aio_context);
>  }
>  
> +BlockDirtyBitmapSha256 *qmp_x_debug_block_dirty_bitmap_sha256(const char *node,
> +                                                              const char *name,
> +                                                              Error **errp)
> +{
> +    AioContext *aio_context;
> +    BdrvDirtyBitmap *bitmap;
> +    BlockDriverState *bs;
> +    BlockDirtyBitmapSha256 *ret = NULL;
> +    char *sha256;
> +
> +    bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp);
> +    if (!bitmap || !bs) {
> +        return NULL;
> +    }
> +
> +    sha256 = bdrv_dirty_bitmap_sha256(bitmap, errp);
> +    if (sha256 == NULL) {
> +        goto out;
> +    }
> +
> +    ret = g_new(BlockDirtyBitmapSha256, 1);
> +    ret->sha256 = sha256;
> +
> +out:
> +    aio_context_release(aio_context);
> +
> +    return ret;
> +}
> +
>  void hmp_drive_del(Monitor *mon, const QDict *qdict)
>  {
>      const char *id = qdict_get_str(qdict, "id");
> diff --git a/include/block/dirty-bitmap.h b/include/block/dirty-bitmap.h
> index 20b3ec7..ded872a 100644
> --- a/include/block/dirty-bitmap.h
> +++ b/include/block/dirty-bitmap.h
> @@ -78,4 +78,6 @@ void bdrv_dirty_bitmap_deserialize_finish(BdrvDirtyBitmap *bitmap);
>  BdrvDirtyBitmap *bdrv_next_dirty_bitmap(BlockDriverState *bs,
>                                          BdrvDirtyBitmap *bitmap);
>  
> +char *bdrv_dirty_bitmap_sha256(const BdrvDirtyBitmap *bitmap, Error **errp);
> +
>  #endif
> diff --git a/include/qemu/hbitmap.h b/include/qemu/hbitmap.h
> index 9239fe5..f353e56 100644
> --- a/include/qemu/hbitmap.h
> +++ b/include/qemu/hbitmap.h
> @@ -238,6 +238,14 @@ void hbitmap_deserialize_zeroes(HBitmap *hb, uint64_t start, uint64_t count,
>  void hbitmap_deserialize_finish(HBitmap *hb);
>  
>  /**
> + * hbitmap_sha256:
> + * @bitmap: HBitmap to operate on.
> + *
> + * Returns SHA256 hash of the last level.
> + */
> +char *hbitmap_sha256(const HBitmap *bitmap, Error **errp);
> +
> +/**
>   * hbitmap_free:
>   * @hb: HBitmap to operate on.
>   *
> diff --git a/qapi/block-core.json b/qapi/block-core.json
> index 932f5bb..8646054 100644
> --- a/qapi/block-core.json
> +++ b/qapi/block-core.json
> @@ -1632,6 +1632,33 @@
>    'data': 'BlockDirtyBitmap' }
>  
>  ##
> +# @BlockDirtyBitmapSha256:
> +#
> +# SHA256 hash of dirty bitmap data
> +#
> +# @sha256: ASCII representation of SHA256 bitmap hash
> +#
> +# Since: 2.9
> +##
> +  { 'struct': 'BlockDirtyBitmapSha256',
> +    'data': {'sha256': 'str'} }
> +
> +##
> +# @x-debug-block-dirty-bitmap-sha256:
> +#
> +# Get bitmap SHA256
> +#
> +# Returns: BlockDirtyBitmapSha256 on success
> +#          If @node is not a valid block device, DeviceNotFound
> +#          If @name is not found or if hashing has failed, GenericError with an
> +#          explanation
> +#
> +# Since: 2.9
> +##
> +  { 'command': 'x-debug-block-dirty-bitmap-sha256',
> +    'data': 'BlockDirtyBitmap', 'returns': 'BlockDirtyBitmapSha256' }
> +
> +##
>  # @blockdev-mirror:
>  #
>  # Start mirroring a block device's writes to a new destination.
> diff --git a/tests/Makefile.include b/tests/Makefile.include
> index 634394a..7a71b4d 100644
> --- a/tests/Makefile.include
> +++ b/tests/Makefile.include
> @@ -526,7 +526,7 @@ tests/test-blockjob$(EXESUF): tests/test-blockjob.o $(test-block-obj-y) $(test-u
>  tests/test-blockjob-txn$(EXESUF): tests/test-blockjob-txn.o $(test-block-obj-y) $(test-util-obj-y)
>  tests/test-thread-pool$(EXESUF): tests/test-thread-pool.o $(test-block-obj-y)
>  tests/test-iov$(EXESUF): tests/test-iov.o $(test-util-obj-y)
> -tests/test-hbitmap$(EXESUF): tests/test-hbitmap.o $(test-util-obj-y)
> +tests/test-hbitmap$(EXESUF): tests/test-hbitmap.o $(test-util-obj-y) $(test-crypto-obj-y)
>  tests/test-x86-cpuid$(EXESUF): tests/test-x86-cpuid.o
>  tests/test-xbzrle$(EXESUF): tests/test-xbzrle.o migration/xbzrle.o page_cache.o $(test-util-obj-y)
>  tests/test-cutils$(EXESUF): tests/test-cutils.o util/cutils.o
> diff --git a/util/hbitmap.c b/util/hbitmap.c
> index 35088e1..412b0fa 100644
> --- a/util/hbitmap.c
> +++ b/util/hbitmap.c
> @@ -13,6 +13,7 @@
>  #include "qemu/hbitmap.h"
>  #include "qemu/host-utils.h"
>  #include "trace.h"
> +#include "crypto/hash.h"
>  
>  /* HBitmaps provides an array of bits.  The bits are stored as usual in an
>   * array of unsigned longs, but HBitmap is also optimized to provide fast
> @@ -689,3 +690,13 @@ void hbitmap_free_meta(HBitmap *hb)
>      hbitmap_free(hb->meta);
>      hb->meta = NULL;
>  }
> +
> +char *hbitmap_sha256(const HBitmap *bitmap, Error **errp)
> +{
> +    size_t size = bitmap->sizes[HBITMAP_LEVELS - 1] * sizeof(unsigned long);
> +    char *data = (char *)bitmap->levels[HBITMAP_LEVELS - 1];
> +    char *hash = NULL;
> +    qcrypto_hash_digest(QCRYPTO_HASH_ALG_SHA256, data, size, &hash, errp);
> +
> +    return hash;
> +}
>
Vladimir Sementsov-Ogievskiy Feb. 16, 2017, 7:09 a.m. UTC | #2 
16.02.2017 03:35, John Snow wrote:
>
> On 02/13/2017 04:54 AM, Vladimir Sementsov-Ogievskiy wrote:
>> Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
>> Reviewed-by: Max Reitz <mreitz@redhat.com>
> This is simply the same as the version in the other two series, right?

Yes. Context a bit differs... Aha, I've discovered that in migration I'm 
adding bdrv_next_dirty_bitmap and in persistent - 
bdrv_dirty_bitmap_next. Anyway, one series should be rebased after 
applying the second..

>
> Reviewed-by: John Snow <jsnow@redhat.com>
>
>> ---
>>   block/dirty-bitmap.c         |  5 +++++
>>   blockdev.c                   | 29 +++++++++++++++++++++++++++++
>>   include/block/dirty-bitmap.h |  2 ++
>>   include/qemu/hbitmap.h       |  8 ++++++++
>>   qapi/block-core.json         | 27 +++++++++++++++++++++++++++
>>   tests/Makefile.include       |  2 +-
>>   util/hbitmap.c               | 11 +++++++++++
>>   7 files changed, 83 insertions(+), 1 deletion(-)
>>
>> diff --git a/block/dirty-bitmap.c b/block/dirty-bitmap.c
>> index 32aa6eb..5bec99b 100644
>> --- a/block/dirty-bitmap.c
>> +++ b/block/dirty-bitmap.c
>> @@ -558,3 +558,8 @@ BdrvDirtyBitmap *bdrv_next_dirty_bitmap(BlockDriverState *bs,
>>   
>>       return QLIST_NEXT(bitmap, list);
>>   }
>> +
>> +char *bdrv_dirty_bitmap_sha256(const BdrvDirtyBitmap *bitmap, Error **errp)
>> +{
>> +    return hbitmap_sha256(bitmap->bitmap, errp);
>> +}
>> diff --git a/blockdev.c b/blockdev.c
>> index db82ac9..4d06885 100644
>> --- a/blockdev.c
>> +++ b/blockdev.c
>> @@ -2790,6 +2790,35 @@ void qmp_block_dirty_bitmap_clear(const char *node, const char *name,
>>       aio_context_release(aio_context);
>>   }
>>   
>> +BlockDirtyBitmapSha256 *qmp_x_debug_block_dirty_bitmap_sha256(const char *node,
>> +                                                              const char *name,
>> +                                                              Error **errp)
>> +{
>> +    AioContext *aio_context;
>> +    BdrvDirtyBitmap *bitmap;
>> +    BlockDriverState *bs;
>> +    BlockDirtyBitmapSha256 *ret = NULL;
>> +    char *sha256;
>> +
>> +    bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp);
>> +    if (!bitmap || !bs) {
>> +        return NULL;
>> +    }
>> +
>> +    sha256 = bdrv_dirty_bitmap_sha256(bitmap, errp);
>> +    if (sha256 == NULL) {
>> +        goto out;
>> +    }
>> +
>> +    ret = g_new(BlockDirtyBitmapSha256, 1);
>> +    ret->sha256 = sha256;
>> +
>> +out:
>> +    aio_context_release(aio_context);
>> +
>> +    return ret;
>> +}
>> +
>>   void hmp_drive_del(Monitor *mon, const QDict *qdict)
>>   {
>>       const char *id = qdict_get_str(qdict, "id");
>> diff --git a/include/block/dirty-bitmap.h b/include/block/dirty-bitmap.h
>> index 20b3ec7..ded872a 100644
>> --- a/include/block/dirty-bitmap.h
>> +++ b/include/block/dirty-bitmap.h
>> @@ -78,4 +78,6 @@ void bdrv_dirty_bitmap_deserialize_finish(BdrvDirtyBitmap *bitmap);
>>   BdrvDirtyBitmap *bdrv_next_dirty_bitmap(BlockDriverState *bs,
>>                                           BdrvDirtyBitmap *bitmap);
>>   
>> +char *bdrv_dirty_bitmap_sha256(const BdrvDirtyBitmap *bitmap, Error **errp);
>> +
>>   #endif
>> diff --git a/include/qemu/hbitmap.h b/include/qemu/hbitmap.h
>> index 9239fe5..f353e56 100644
>> --- a/include/qemu/hbitmap.h
>> +++ b/include/qemu/hbitmap.h
>> @@ -238,6 +238,14 @@ void hbitmap_deserialize_zeroes(HBitmap *hb, uint64_t start, uint64_t count,
>>   void hbitmap_deserialize_finish(HBitmap *hb);
>>   
>>   /**
>> + * hbitmap_sha256:
>> + * @bitmap: HBitmap to operate on.
>> + *
>> + * Returns SHA256 hash of the last level.
>> + */
>> +char *hbitmap_sha256(const HBitmap *bitmap, Error **errp);
>> +
>> +/**
>>    * hbitmap_free:
>>    * @hb: HBitmap to operate on.
>>    *
>> diff --git a/qapi/block-core.json b/qapi/block-core.json
>> index 932f5bb..8646054 100644
>> --- a/qapi/block-core.json
>> +++ b/qapi/block-core.json
>> @@ -1632,6 +1632,33 @@
>>     'data': 'BlockDirtyBitmap' }
>>   
>>   ##
>> +# @BlockDirtyBitmapSha256:
>> +#
>> +# SHA256 hash of dirty bitmap data
>> +#
>> +# @sha256: ASCII representation of SHA256 bitmap hash
>> +#
>> +# Since: 2.9
>> +##
>> +  { 'struct': 'BlockDirtyBitmapSha256',
>> +    'data': {'sha256': 'str'} }
>> +
>> +##
>> +# @x-debug-block-dirty-bitmap-sha256:
>> +#
>> +# Get bitmap SHA256
>> +#
>> +# Returns: BlockDirtyBitmapSha256 on success
>> +#          If @node is not a valid block device, DeviceNotFound
>> +#          If @name is not found or if hashing has failed, GenericError with an
>> +#          explanation
>> +#
>> +# Since: 2.9
>> +##
>> +  { 'command': 'x-debug-block-dirty-bitmap-sha256',
>> +    'data': 'BlockDirtyBitmap', 'returns': 'BlockDirtyBitmapSha256' }
>> +
>> +##
>>   # @blockdev-mirror:
>>   #
>>   # Start mirroring a block device's writes to a new destination.
>> diff --git a/tests/Makefile.include b/tests/Makefile.include
>> index 634394a..7a71b4d 100644
>> --- a/tests/Makefile.include
>> +++ b/tests/Makefile.include
>> @@ -526,7 +526,7 @@ tests/test-blockjob$(EXESUF): tests/test-blockjob.o $(test-block-obj-y) $(test-u
>>   tests/test-blockjob-txn$(EXESUF): tests/test-blockjob-txn.o $(test-block-obj-y) $(test-util-obj-y)
>>   tests/test-thread-pool$(EXESUF): tests/test-thread-pool.o $(test-block-obj-y)
>>   tests/test-iov$(EXESUF): tests/test-iov.o $(test-util-obj-y)
>> -tests/test-hbitmap$(EXESUF): tests/test-hbitmap.o $(test-util-obj-y)
>> +tests/test-hbitmap$(EXESUF): tests/test-hbitmap.o $(test-util-obj-y) $(test-crypto-obj-y)
>>   tests/test-x86-cpuid$(EXESUF): tests/test-x86-cpuid.o
>>   tests/test-xbzrle$(EXESUF): tests/test-xbzrle.o migration/xbzrle.o page_cache.o $(test-util-obj-y)
>>   tests/test-cutils$(EXESUF): tests/test-cutils.o util/cutils.o
>> diff --git a/util/hbitmap.c b/util/hbitmap.c
>> index 35088e1..412b0fa 100644
>> --- a/util/hbitmap.c
>> +++ b/util/hbitmap.c
>> @@ -13,6 +13,7 @@
>>   #include "qemu/hbitmap.h"
>>   #include "qemu/host-utils.h"
>>   #include "trace.h"
>> +#include "crypto/hash.h"
>>   
>>   /* HBitmaps provides an array of bits.  The bits are stored as usual in an
>>    * array of unsigned longs, but HBitmap is also optimized to provide fast
>> @@ -689,3 +690,13 @@ void hbitmap_free_meta(HBitmap *hb)
>>       hbitmap_free(hb->meta);
>>       hb->meta = NULL;
>>   }
>> +
>> +char *hbitmap_sha256(const HBitmap *bitmap, Error **errp)
>> +{
>> +    size_t size = bitmap->sizes[HBITMAP_LEVELS - 1] * sizeof(unsigned long);
>> +    char *data = (char *)bitmap->levels[HBITMAP_LEVELS - 1];
>> +    char *hash = NULL;
>> +    qcrypto_hash_digest(QCRYPTO_HASH_ALG_SHA256, data, size, &hash, errp);
>> +
>> +    return hash;
>> +}
>>
diff mbox

Patch

diff --git a/block/dirty-bitmap.c b/block/dirty-bitmap.c
index 32aa6eb..5bec99b 100644
--- a/block/dirty-bitmap.c
+++ b/block/dirty-bitmap.c
@@ -558,3 +558,8 @@  BdrvDirtyBitmap *bdrv_next_dirty_bitmap(BlockDriverState *bs,
 
     return QLIST_NEXT(bitmap, list);
 }
+
+char *bdrv_dirty_bitmap_sha256(const BdrvDirtyBitmap *bitmap, Error **errp)
+{
+    return hbitmap_sha256(bitmap->bitmap, errp);
+}
diff --git a/blockdev.c b/blockdev.c
index db82ac9..4d06885 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -2790,6 +2790,35 @@  void qmp_block_dirty_bitmap_clear(const char *node, const char *name,
     aio_context_release(aio_context);
 }
 
+BlockDirtyBitmapSha256 *qmp_x_debug_block_dirty_bitmap_sha256(const char *node,
+                                                              const char *name,
+                                                              Error **errp)
+{
+    AioContext *aio_context;
+    BdrvDirtyBitmap *bitmap;
+    BlockDriverState *bs;
+    BlockDirtyBitmapSha256 *ret = NULL;
+    char *sha256;
+
+    bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp);
+    if (!bitmap || !bs) {
+        return NULL;
+    }
+
+    sha256 = bdrv_dirty_bitmap_sha256(bitmap, errp);
+    if (sha256 == NULL) {
+        goto out;
+    }
+
+    ret = g_new(BlockDirtyBitmapSha256, 1);
+    ret->sha256 = sha256;
+
+out:
+    aio_context_release(aio_context);
+
+    return ret;
+}
+
 void hmp_drive_del(Monitor *mon, const QDict *qdict)
 {
     const char *id = qdict_get_str(qdict, "id");
diff --git a/include/block/dirty-bitmap.h b/include/block/dirty-bitmap.h
index 20b3ec7..ded872a 100644
--- a/include/block/dirty-bitmap.h
+++ b/include/block/dirty-bitmap.h
@@ -78,4 +78,6 @@  void bdrv_dirty_bitmap_deserialize_finish(BdrvDirtyBitmap *bitmap);
 BdrvDirtyBitmap *bdrv_next_dirty_bitmap(BlockDriverState *bs,
                                         BdrvDirtyBitmap *bitmap);
 
+char *bdrv_dirty_bitmap_sha256(const BdrvDirtyBitmap *bitmap, Error **errp);
+
 #endif
diff --git a/include/qemu/hbitmap.h b/include/qemu/hbitmap.h
index 9239fe5..f353e56 100644
--- a/include/qemu/hbitmap.h
+++ b/include/qemu/hbitmap.h
@@ -238,6 +238,14 @@  void hbitmap_deserialize_zeroes(HBitmap *hb, uint64_t start, uint64_t count,
 void hbitmap_deserialize_finish(HBitmap *hb);
 
 /**
+ * hbitmap_sha256:
+ * @bitmap: HBitmap to operate on.
+ *
+ * Returns SHA256 hash of the last level.
+ */
+char *hbitmap_sha256(const HBitmap *bitmap, Error **errp);
+
+/**
  * hbitmap_free:
  * @hb: HBitmap to operate on.
  *
diff --git a/qapi/block-core.json b/qapi/block-core.json
index 932f5bb..8646054 100644
--- a/qapi/block-core.json
+++ b/qapi/block-core.json
@@ -1632,6 +1632,33 @@ 
   'data': 'BlockDirtyBitmap' }
 
 ##
+# @BlockDirtyBitmapSha256:
+#
+# SHA256 hash of dirty bitmap data
+#
+# @sha256: ASCII representation of SHA256 bitmap hash
+#
+# Since: 2.9
+##
+  { 'struct': 'BlockDirtyBitmapSha256',
+    'data': {'sha256': 'str'} }
+
+##
+# @x-debug-block-dirty-bitmap-sha256:
+#
+# Get bitmap SHA256
+#
+# Returns: BlockDirtyBitmapSha256 on success
+#          If @node is not a valid block device, DeviceNotFound
+#          If @name is not found or if hashing has failed, GenericError with an
+#          explanation
+#
+# Since: 2.9
+##
+  { 'command': 'x-debug-block-dirty-bitmap-sha256',
+    'data': 'BlockDirtyBitmap', 'returns': 'BlockDirtyBitmapSha256' }
+
+##
 # @blockdev-mirror:
 #
 # Start mirroring a block device's writes to a new destination.
diff --git a/tests/Makefile.include b/tests/Makefile.include
index 634394a..7a71b4d 100644
--- a/tests/Makefile.include
+++ b/tests/Makefile.include
@@ -526,7 +526,7 @@  tests/test-blockjob$(EXESUF): tests/test-blockjob.o $(test-block-obj-y) $(test-u
 tests/test-blockjob-txn$(EXESUF): tests/test-blockjob-txn.o $(test-block-obj-y) $(test-util-obj-y)
 tests/test-thread-pool$(EXESUF): tests/test-thread-pool.o $(test-block-obj-y)
 tests/test-iov$(EXESUF): tests/test-iov.o $(test-util-obj-y)
-tests/test-hbitmap$(EXESUF): tests/test-hbitmap.o $(test-util-obj-y)
+tests/test-hbitmap$(EXESUF): tests/test-hbitmap.o $(test-util-obj-y) $(test-crypto-obj-y)
 tests/test-x86-cpuid$(EXESUF): tests/test-x86-cpuid.o
 tests/test-xbzrle$(EXESUF): tests/test-xbzrle.o migration/xbzrle.o page_cache.o $(test-util-obj-y)
 tests/test-cutils$(EXESUF): tests/test-cutils.o util/cutils.o
diff --git a/util/hbitmap.c b/util/hbitmap.c
index 35088e1..412b0fa 100644
--- a/util/hbitmap.c
+++ b/util/hbitmap.c
@@ -13,6 +13,7 @@ 
 #include "qemu/hbitmap.h"
 #include "qemu/host-utils.h"
 #include "trace.h"
+#include "crypto/hash.h"
 
 /* HBitmaps provides an array of bits.  The bits are stored as usual in an
  * array of unsigned longs, but HBitmap is also optimized to provide fast
@@ -689,3 +690,13 @@  void hbitmap_free_meta(HBitmap *hb)
     hbitmap_free(hb->meta);
     hb->meta = NULL;
 }
+
+char *hbitmap_sha256(const HBitmap *bitmap, Error **errp)
+{
+    size_t size = bitmap->sizes[HBITMAP_LEVELS - 1] * sizeof(unsigned long);
+    char *data = (char *)bitmap->levels[HBITMAP_LEVELS - 1];
+    char *hash = NULL;
+    qcrypto_hash_digest(QCRYPTO_HASH_ALG_SHA256, data, size, &hash, errp);
+
+    return hash;
+}