On Thu, Mar 09, 2006 at 12:03:06PM +0000, Christoph Hellwig wrote:
> On Thu, Mar 09, 2006 at 01:24:38PM +0530, Suzuki wrote:
> >
> > Missed out linux-aio & linux-fs-devel lists. Forwarding.
> >
> > Comments ?
>
> I've seen this too. The problem is that __generic_file_aio_read can return
> with or without the i_mutex locked in the direct I/O case for filesystems
> that set DIO_OWN_LOCKING.
Not for reads AFAICT - __generic_file_aio_read + own-locking
should always have released i_mutex at the end of the direct
read - are you thinking of writes or have I missed something?
> It's a nasty one and I haven't found a better solution
> than copying lots of code from filemap.c into xfs.
Er, eek? Hopefully thats not needed - from my reading of the
code, all the i_mutex locking for direct reads lives inside
direct-io.c, not filemap.c -- is the solution from my other
mail not workable? (isn't it only writes that has the wierd
buffered I/O fallback + i_sem/i_mutex locking interaction?).
thanks.
--
Nathan
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