Re: [Qemu-devel] iSCSI support for QEMU, update

[Christoph Hellwig]

On Fri, Apr 22, 2011 at 04:35:11PM +1000, ronnie sahlberg wrote:
> Ok, I am confused

And this time it's my fault, sorry.

> I have to set FUA if the WB(I guessed this meant write-back) flag is set?
> Not the opposite (I assume opposite of write-back is write-through) ?

Sorry, I meant exactly the opposite.  You do not have to set FUA if either
of those two flags is present, so:

        if (flags & (BDRV_O_CACHE_WB|BDRV_O_NOCACHE))
                caching is ok, write with FUA=0
        else
                caching is NOT ok, write with FUA=1