linux-kernel - Re: [PATCH v2 0/4] io_uring: consistent behaviour with linked read/write

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Date:   Mon, 21 Feb 2022 17:48:40 +0000
From:   Dylan Yudaken <dylany@...com>
To:     "axboe@...nel.dk" <axboe@...nel.dk>,
        "asml.silence@...il.com" <asml.silence@...il.com>,
        "io-uring@...r.kernel.org" <io-uring@...r.kernel.org>
CC:     Kernel Team <Kernel-team@...com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 0/4] io_uring: consistent behaviour with linked
 read/write

On Mon, 2022-02-21 at 09:33 -0700, Jens Axboe wrote:
> On 2/21/22 7:16 AM, Dylan Yudaken wrote:
> > Currently submitting multiple read/write for one file with offset =
> > -1 will
> > not behave as if calling read(2)/write(2) multiple times. The
> > offset may be
> > pinned to the same value for each submission (for example if they
> > are
> > punted to the async worker) and so each read/write will have the
> > same
> > offset.
> > 
> > This patch series fixes this.
> > 
> > Patch 1,3 cleans up the code a bit
> > 
> > Patch 2 grabs the file position at execution time, rather than when
> > the job
> > is queued to be run which fixes inconsistincies when jobs are run
> > asynchronously.
> > 
> > Patch 4 increments the file's f_pos when reading it, which fixes
> > inconsistincies with concurrent runs. 
> > 
> > A test for this will be submitted to liburing separately.
> 
> Looks good to me, but the patch 2 change will bubble through to patch
> 3
> and 4 as well. Care to respin a v3?
> 

Yes sure - will do it combined with the test v3