linux-kernel - Re: [PATCH V8 3/3] fuse: Handle AIO read and write in passthrough

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Message-ID: <20200921152844.GA600068@google.com>
Date:   Mon, 21 Sep 2020 16:28:44 +0100
From:   Alessio Balsini <balsini@...roid.com>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     Alessio Balsini <balsini@...roid.com>,
        Miklos Szeredi <miklos@...redi.hu>,
        Akilesh Kailash <akailash@...gle.com>,
        Amir Goldstein <amir73il@...il.com>,
        David Anderson <dvander@...gle.com>,
        Eric Yan <eric.yan@...plus.com>, Jann Horn <jannh@...gle.com>,
        Martijn Coenen <maco@...roid.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Lawrence <paullawrence@...gle.com>,
        Stefano Duo <stefanoduo@...gle.com>,
        Zimuzo Ezeozue <zezeozue@...gle.com>,
        fuse-devel@...ts.sourceforge.net, kernel-team@...roid.com,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V8 3/3] fuse: Handle AIO read and write in passthrough

On Fri, Sep 11, 2020 at 11:23:22AM -0600, Jens Axboe wrote:
> On 9/11/20 10:34 AM, Alessio Balsini wrote:
> > Extend the passthrough feature by handling asynchronous IO both for read
> > and write operations.
> > When an AIO request is received, targeting a FUSE file with passthrough
> > functionality enabled, a new identical AIO request is created, the file
> > pointer of which is updated with the file pointer of the lower file system,
> > and the completion handler is set with a special AIO passthrough handler.
> > The lower file system AIO request is allocated in dynamic kernel memory
> > and, when it completes, the allocated memory is freed and the completion
> > signal is propagated to the FUSE AIO request by triggering its completion
> > callback as well.
> > 
> > Signed-off-by: Alessio Balsini <balsini@...roid.com>
> > ---
> >  fs/fuse/passthrough.c | 66 +++++++++++++++++++++++++++++++++++++++++--
> >  1 file changed, 63 insertions(+), 3 deletions(-)
> > 
> > diff --git a/fs/fuse/passthrough.c b/fs/fuse/passthrough.c
> > index 44a78e02f45d..87b57b26fd8a 100644
> > --- a/fs/fuse/passthrough.c
> > +++ b/fs/fuse/passthrough.c
> > @@ -2,10 +2,16 @@
> >  
> >  #include "fuse_i.h"
> >  
> > +#include <linux/aio.h>
> 
> What is this include for? It's not using any aio parts at all.
> 
> -- 
> Jens Axboe
> 

Slipped from a cleanup. Fixed.

Thanks!
Alessio