[Xen-devel] some questions about the new blktap2 module

[fanliang <fanliang@xxxxxxxxxx>]

Hi, all:

    I have some questions when read the code of the new blktap2 module. One is  in function tapdisk_vbd_map_device ( ) . In this function , the userspace proccess tapdisk2 used ioctl like this : 

     ioctl(ring->fd, BLKTAP_IOCTL_SETMODE, BLKTAP_MODE_INTERPOSE);

From the context , we can get that "ring->fd " is the file handle of the  ring-device  [/dev/xen/blktap-2/blktap[minor] ]  . In the blktap2 driver codes , I find that blktap_ring_ioctl() didn't implement the  BLKTAP_IOCTL_SETMODE ioctl case . I used xen-unstable code package and linux-2.6.18-xen-3.4.2 code package.

So my question is :

1,  Is blktap2 code in xen-unstable not match with linux-2.6.18-xen-3.4.2 ?

2,  Any body used VHD disk with blktap2 ?

 

Thanks ,

Lyman Van

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