Re: [Qemu-devel] Re: [PATCH][v2] Align file accesses with cache=off (O_DIRECT)

[Kevin Wolf]

Anthony Liguori schrieb:
> That's a problem with the current patch honestly, we should not rely on 
> callers to align buffers.  bdrv_read()/bdrv_aio_read()/bdrv_pread() all 
> should be tolerant of unaligned buffers if we're going to support O_DIRECT.

I agree, we shouldn't rely on that. And actually we don't. ;-)

If (buf & 0x1ff) we're using the emulation with our own aligned buffer. 
Without this "tolerance" my test image wouldn't even boot up.

Kevin