On Mon, Feb 19, 2007 at 07:21:09PM -0500, Benjamin LaHaise wrote:
> On Mon, Feb 19, 2007 at 04:50:48PM -0500, Chris Mason wrote:
> > aio is not responsible for this particular synchronization. Those fixes
> > (if we make them) should come from other places. The patch is important
> > to get aio error handling right.
> >
> > I would argue that one common cause of the EIO is userland
> > error (mmap concurrent with O_DIRECT), and EIO is the correct answer.
>
> I disagree. That means that using the pagecache to synchronize things like
> the proposed online defragmentation will occasionally make O_DIRECT users
> fail. O_DIRECT doesn't prevent the sysadmin from copying files or other
> page cache uses, which implies that generating an error in these cases is
> horrifically broken. If only root could do it, I wouldn't complain, but
> this would seem to imply that user vs root holes still exist.
I'm working on this part in the placeholder patches. It's just a separate
problem from the aio code.
-chris
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