On 2013/4/18 16:30, Stefan Hajnoczi wrote:
On Wed, Apr 10, 2013 at 04:11:48PM +0800, Dong Xu Wang wrote:
+The Header is included in the first bytes:
+(HEADER_SIZE is defined in 40-43 bytes.)
+ Byte 0 - 3: magic
+ add-cow magic string ("ACOW").
+
+ 4 - 7: backing file name offset
+ Offset in the add-cow file at which the backing
+ file name is stored (NB: The string is not
+ lNUL-terminated).
s/lNUL/NUL/
Okay.
+ 24 - 31: features
+ Bitmask of features. If a feature bit is set
+ but not recognized, the add-cow file should be
+ dropped. They are not used in now.
"If a feature bit is set but not recognized, the opening the add-cow file must fail.
No features bits are currently defined."
Okay.
