On Tue, Apr 15, 2014 at 07:05:40PM +0200, Jan Kara wrote:
> On Sat 12-04-14 13:02:41, Ted Tso wrote:
> > Al Viro pointed out that we need to make sure we only allow one
> > O_APPEND write to proceed at a time so that the the s_bitmap_maxbytes
> > check can be properly checked.
> But this introduces lock inversion between aio_mutex and i_mutex, doesn't
> it?
Doh! Thanks for pointing that out. Fortunately, we don't need to
care about optimizing the AIO/DIO O_APPEND write case, so probably the
best thing to do is to unconditionally take aio_mutex and call
ext4_unwritten_wait() early, before we grab i_mutex. So in effect
we'll treat all O_APPEND writes as being unaligned in and in need of
serialization.
I'll send out a revised version for this last patch.
- Ted
--
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
