linux-kernel - Re: [PATCH 1/7] block: add queue_logical_block_mask() and bdev_logical_block

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Date:   Wed, 28 Jun 2023 17:46:34 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Yangtao Li <frank.li@...o.com>
Cc:     axboe@...nel.dk, song@...nel.org, viro@...iv.linux.org.uk,
        brauner@...nel.org, xiang@...nel.org, chao@...nel.org,
        huyue2@...lpad.com, jefflexu@...ux.alibaba.com, hch@...radead.org,
        djwong@...nel.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-raid@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-erofs@...ts.ozlabs.org,
        linux-xfs@...r.kernel.org
Subject: Re: [PATCH 1/7] block: add queue_logical_block_mask() and
 bdev_logical_block_mask()

On Wed, Jun 28, 2023 at 05:34:54PM +0800, Yangtao Li wrote:
> Introduce queue_logical_block_mask() and bdev_logical_block_mask()
> to simplify code, which replace (queue_logical_block_size(q) - 1)
> and (bdev_logical_block_size(bdev) - 1).

The thing is that I know what queue_logical_block_size - 1 does.
That's the low bits.  _Which_ bits are queue_logical_block_mask?
The high bits or the low bits?  And before you say "It's obviously",
we have both ways round in the kernel today.

I am not in favour of this change.  I might be in favour of bool
queue_logical_block_aligned(q, x), but even then it doesn't seem worth
the bits.