linux-kernel - Re: [PATCH] block: Don't invalidate pagecache for invalid falloc modes

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Message-ID: <8edda030-9394-4252-bf43-3cb1207cf640@kernel.dk>
Date:   Wed, 11 Oct 2023 15:54:10 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Sarthak Kukreti <sarthakkukreti@...omium.org>,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Bart Van Assche <bvanassche@....org>,
        "Darrick J. Wong" <darrick.wong@...cle.com>,
        stable@...r.kernel.org, "Darrick J . Wong" <djwong@...nel.org>,
        Christoph Hellwig <hch@....de>,
        Mike Snitzer <snitzer@...nel.org>
Subject: Re: [PATCH] block: Don't invalidate pagecache for invalid falloc
 modes

On 10/11/23 2:20 PM, Jens Axboe wrote:
> On 10/11/23 2:12 PM, Sarthak Kukreti wrote:
>> Only call truncate_bdev_range() if the fallocate mode is
>> supported. This fixes a bug where data in the pagecache
>> could be invalidated if the fallocate() was called on the
>> block device with an invalid mode.
> 
> Fix looks fine, but would be nicer if we didn't have to duplicate the
> truncate_bdev_range() in each switch clause. Can we check this upfront
> instead?

Don't see a good way to do it on my end, so let's just go with what is
there now. I applied it with the commit message reformatted.

-- 
Jens Axboe