qcow2: Support for feature table header extension

Instead of printing an ugly bitmask, qemu can now print a more helpful
string even for yet unknown features.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/block/qcow2.h b/block/qcow2.h
index df2bdfd0c6..2a982445a1 100644
--- a/block/qcow2.h
+++ b/block/qcow2.h
@@ -104,6 +104,18 @@ typedef struct Qcow2UnknownHeaderExtension {
     uint8_t data[];
 } Qcow2UnknownHeaderExtension;
 
+enum {
+    QCOW2_FEAT_TYPE_INCOMPATIBLE    = 0,
+    QCOW2_FEAT_TYPE_COMPATIBLE      = 1,
+    QCOW2_FEAT_TYPE_AUTOCLEAR       = 2,
+};
+
+typedef struct Qcow2Feature {
+    uint8_t type;
+    uint8_t bit;
+    char    name[46];
+} QEMU_PACKED Qcow2Feature;
+
 typedef struct BDRVQcowState {
     int cluster_bits;
     int cluster_size;