linux-kernel - Re: [PATCH] fuse: Fix the return code of fuse_direct

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Date:   Mon, 25 Nov 2019 11:58:19 -0500
From:   Masayoshi Mizuma <msys.mizuma@...il.com>
To:     Miklos Szeredi <miklos@...redi.hu>
Cc:     linux-fsdevel@...r.kernel.org,
        Masayoshi Mizuma <m.mizuma@...fujitsu.com>,
        linux-kernel@...r.kernel.org, virtio-fs@...hat.com
Subject: Re: [PATCH] fuse: Fix the return code of fuse_direct_IO() to deal
 with the error for aio

On Mon, Nov 25, 2019 at 01:38:38PM +0100, Miklos Szeredi wrote:
> On Mon, Nov 18, 2019 at 3:24 AM Masayoshi Mizuma <msys.mizuma@...il.com> wrote:
> >
> > From: Masayoshi Mizuma <m.mizuma@...fujitsu.com>
> >
> > exit_aio() is sometimes stuck in wait_for_completion() after aio is issued
> > with direct IO and the task receives a signal.
> >
> > That is because kioctx in mm->ioctx_table is in use by aio_kiocb.
> > aio_kiocb->ki_refcnt is 1 at that time. That means iocb_put() isn't
> > called correctly.
> >
> > fuse_get_req() returns as -EINTR when it's blocked and receives a signal.
> > fuse_direct_IO() deals with the -EINTER as -EIOCBQUEUED and returns as
> > -EIOCBQUEUED even though the aio isn't queued.
> > As the result, aio_rw_done() doesn't handle the error, so iocb_put() isn't
> > called via aio_complete_rw(), which is the callback.
> 
> Hi,
> 
> Thanks for the report.
> 
> Can you please test the attached patch (without your patch)?

The patch you attached works well, thanks! I tested it with virtiofs.

Should I post the patch? Or could you take care of it? Let me know.

Thanks!
Masa