linux-kernel - Re: [PATCH v2 3/8] fs: clear or set FMODE

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Date:   Sat, 25 Jun 2022 14:29:09 +0100
From:   Al Viro <viro@...iv.linux.org.uk>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     "Jason A. Donenfeld" <Jason@...c4.com>,
        linux-kernel@...r.kernel.org, Jens Axboe <axboe@...nel.dk>,
        linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH v2 3/8] fs: clear or set FMODE_LSEEK based on llseek
 function

On Sat, Jun 25, 2022 at 06:07:45AM -0700, Christoph Hellwig wrote:
> On Sat, Jun 25, 2022 at 01:01:10PM +0200, Jason A. Donenfeld wrote:
> > This helps unify a longstanding wart where FMODE_LSEEK hasn't been
> > uniformly unset when it should be.
> 
> I think we could just remove FMODE_LSEEK after the previous patch
> as we can just check for the presence of a ->llseek method instead.

I wouldn't bet on that - as it is, an ->open() instance can decide
in some cases to clear FMODE_LSEEK, despite having file_operations
with non-NULL ->llseek.