Am 30.03.2011 20:40, schrieb Lyu Mitnick:
Hello Stefan,
I have spent a whole night to trace the code of block/vpc.c and
compare against the VHD specifications
(at
http://www.microsoft.com/downloads/en/details.aspx?FamilyID=C2D03242-2FFB-48EF-A211-F0C44741109E&displaylang=en
<http://www.microsoft.com/downloads/en/details.aspx?FamilyID=C2D03242-2FFB-48EF-A211-F0C44741109E&displaylang=en>).
It seems that there isn't Fixed hard disk image and Differencing hard
disk image support now. I am wondering whether what I has
learned from tracing code is true or false? I also found some
possibility of optimization in block/vpc.c. Should I contact mentor
assigned to this project in private or post the whole idea on the
mailing list??
thanks very much
Mitnick
Hello Mitnick,
asynchronous i/o is also missing in block/vpc.c.
All newer block drivers support asynchronous reads and writes,
only some old drivers don't.
So adding asynchronous i/o to at least some of the old drivers
would improve their usability.
Look for "aio" in block/*.c to get a starting point.
Regards
Stefan (W.)
