linux-kernel - Re: [PATCH] netfs: Fix setting of BDP

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Message-ID: <110d2995-f473-4781-9412-30f7f96858dd@kernel.dk>
Date: Tue, 21 May 2024 10:04:59 -0600
From: Jens Axboe <axboe@...nel.dk>
To: David Howells <dhowells@...hat.com>
Cc: Steve French <stfrench@...rosoft.com>, Jeff Layton <jlayton@...nel.org>,
 Enzo Matsumiya <ematsumiya@...e.de>, Matthew Wilcox <willy@...radead.org>,
 Christian Brauner <brauner@...nel.org>, netfs@...ts.linux.dev,
 v9fs@...ts.linux.dev, linux-afs@...ts.infradead.org,
 linux-cifs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] netfs: Fix setting of BDP_ASYNC from iocb flags

On 5/21/24 9:54 AM, David Howells wrote:
> Jens Axboe <axboe@...nel.dk> wrote:
> 
>> However, I'll note that BDP_ASYNC is horribly named, it should be
>> BDP_NOWAIT instead. But that's a separate thing, fix looks correct
>> as-is.
> 
> I thought IOCB_NOWAIT was related to RWF_NOWAIT, but apparently not from the
> code.

It is, something submitted with RWF_NOWAIT should have IOCB_NOWAIT set.
But RWF_NOWAIT isn't the sole user of IOCB_NOWAIT, and no assumptions
should be made about whether something is sync or async based on whether
or not RWF_NOWAIT is set. Those aren't related other than _some_ proper
async IO will have IOCB_NOWAIT set, and others will not.

-- 
Jens Axboe