Re: [Qemu-devel] [PATCH] Align file accesses with cache=off (O_DIRECT)

[Kevin Wolf]

Am Mittwoch, 30. April 2008 16:30:27 schrieb Blue Swirl:
> Maybe the alignment could be handled like AIO and synchronous IO
> emulation layers are added in bdrv_register, but at open stage?

You mean to preserve the original pread if the file is opened without O_DIRECT 
and replace it by the emulation function only if O_DIRECT is really used? 
Certainly possible in some way (having a function pointer in BDRVRawState), 
but this won't save us anything.

But maybe I'm just missing your point. How exactly do you want to handle 
things and what does it improve?

Kevin