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[21/29] qcow2-bitmap: add EXTRA_DATA_COMPATIBLE flag

Message ID 1470668720-211300-22-git-send-email-vsementsov@virtuozzo.com (mailing list archive)
State New, archived
Headers show

Commit Message

Vladimir Sementsov-Ogievskiy Aug. 8, 2016, 3:05 p.m. UTC 
If this flag is unset and extra data is present the bitmap should be
read-only. For now just return error for this case.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
---
 block/qcow2-bitmap.c | 8 ++++++++
 1 file changed, 8 insertions(+)
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Patch

diff --git a/block/qcow2-bitmap.c b/block/qcow2-bitmap.c
index 1c46dcb..a00eae4 100644
--- a/block/qcow2-bitmap.c
+++ b/block/qcow2-bitmap.c
@@ -47,6 +47,7 @@ 
 #define BME_RESERVED_FLAGS 0xfffffffc
 #define BME_FLAG_IN_USE 1
 #define BME_FLAG_AUTO   (1U << 1)
+#define BME_FLAG_EXTRA_DATA_COMPATIBLE   (1U << 1)
 
 /* bits [1, 8] U [56, 63] are reserved */
 #define BME_TABLE_ENTRY_RESERVED_MASK 0xff000000000001fe
@@ -600,6 +601,13 @@  static BdrvDirtyBitmap *load_bitmap(BlockDriverState *bs,
         goto fail;
     }
 
+    if (!(bmh->flags & BME_FLAG_EXTRA_DATA_COMPATIBLE) &&
+            bmh->extra_data_size != 0) {
+        error_setg(errp, "Incompatible extra data found for bitmap '%s'",
+                   name);
+        goto fail;
+    }
+
     ret = bitmap_table_load(bs, bmh, &bitmap_table);
     if (ret < 0) {
         error_setg_errno(errp, -ret,