Re: [Xen-devel] [PATCH 0 of 4] aio event fd support to blktap2

["David P. Quigley" <dpquigl@xxxxxxxxxxxxx>]

On Tue, 2010-02-02 at 15:10 -0800, Daniel Stodden wrote:
> On Tue, 2010-02-02 at 17:53 -0500, David P. Quigley wrote:
> > Is this patch set related to the AIO poll support that blocktap2 keeps
> > complaining about when I use tap:tapdisk:aio as the disk type? 
> 
> On pvops, yes.
> 
> > I found
> > the code that changes io_setup in the Novell Xen patches but its part of
> > a reasonably large patch.
> 
> Shouldn't depend on the disktype. As long as it's blktap, not blkback on
> a raw vdi, all disk drivers depend on this.
> 
> The io_setup change you're referring might rather be the old way of
> doing things. It made io_setup return an fd to poll, if the io_setup
> caller calls with a 'magic' (1, actually) aio_ctx value.
> 
> Daniel
> 

Seems like I made a mistake and copied the version of the error that was
generated before I updated xen-unstable to have your latest changes. Now
I'm getting a completely different error. Does the aio driver handle raw
disk files or do I need to create the image in some special way? Not the
error I get has to do with incorrect magic in the shared info and this
results in a segfault. I'll try to hunt them down. The tapdisk output is
listed below.

Dave

tapdisk2[2366]: Created /dev/xen/blktap-2/blktap0 device
tapdisk2[2366]: Created /dev/xen/blktap-2/tapdev0 device
tapdisk2[2366]: new interface: ring: 251, device: 253, minor: 0
tapdisk2[2366]: I/O queue driver: lio
tapdisk2[2366]: Incorrect magic in shared info.
tapdisk2[2366]: Failed to open shared info.
tapdisk2[2366]: segfault at 18 ip 0000003e42008dc1 sp 00007fffd29889a0 error 4 
in libpthread-2.10.2.so[3e42000000+17000]



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