linux-ext4 - Re: [PATCH 1/7] iomap: merge iomap_seek_hole() and iomap_seek

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Date:   Thu, 27 Jul 2023 20:10:47 +0800
From:   Hao Xu <hao.xu@...ux.dev>
To:     Dave Chinner <david@...morbit.com>
Cc:     io-uring@...r.kernel.org, Jens Axboe <axboe@...nel.dk>,
        Dominique Martinet <asmadeus@...ewreck.org>,
        Pavel Begunkov <asml.silence@...il.com>,
        Christian Brauner <brauner@...nel.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Stefan Roesch <shr@...com>, Clay Harris <bugs@...ycon.org>,
        "Darrick J . Wong" <djwong@...nel.org>,
        linux-fsdevel@...r.kernel.org, linux-xfs@...r.kernel.org,
        linux-ext4@...r.kernel.org, Wanpeng Li <wanpengli@...cent.com>
Subject: Re: [PATCH 1/7] iomap: merge iomap_seek_hole() and iomap_seek_data()

On 7/27/23 05:50, Dave Chinner wrote:
> On Wed, Jul 26, 2023 at 06:25:57PM +0800, Hao Xu wrote:
>> From: Hao Xu <howeyxu@...cent.com>
>>
>> The two functions share almost same code, merge them together.
>> No functional change in this patch.
> 
> No, please don't. seek data and seek hole have subtly different
> semantics and return values, and we've explicitly kept them separate
> because it's much easier to maintain them as separate functions with
> separate semantics than combine them into a single function with
> lots of non-obvious conditional behaviour.
> 
> The fact that the new iomap_seek() API requires a boolean "SEEK_DATA
> or SEEK_HOLE" field to indicate that the caller wants makes it clear
> that this isn't actually an improvement over explicit
> iomap_seek_data() and iomap_seek_hole() API calls.
> 
> -Dave.

I'll revert it back in next version. Thanks.