linux-kernel - Re: [PATCH] fs: align IOCB_* flags with RWF

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Message-ID: <20200907201516.GC27537@casper.infradead.org>
Date:   Mon, 7 Sep 2020 21:15:16 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Jann Horn <jannh@...gle.com>
Subject: Re: [PATCH] fs: align IOCB_* flags with RWF_* flags

On Mon, Aug 31, 2020 at 12:08:10PM -0600, Jens Axboe wrote:
> We have a set of flags that are shared between the two and inherired
> in kiocb_set_rw_flags(), but we check and set these individually.
> Reorder the IOCB flags so that the bottom part of the space is synced
> with the RWF flag space, and then we can do them all in one mask and
> set operation.
> 
> The only exception is RWF_SYNC, which needs to mark IOCB_SYNC and
> IOCB_DSYNC. Do that one separately.
> 
> This shaves 15 bytes of text from kiocb_set_rw_flags() for me.
> 
> Signed-off-by: Jens Axboe <axboe@...nel.dk>

Suggested-by: Matthew Wilcox (Oracle) <willy@...radead.org>