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Message-ID: <20231127064737.GH38156@ZenIV>
Date:   Mon, 27 Nov 2023 06:47:37 +0000
From:   Al Viro <viro@...iv.linux.org.uk>
To:     Yu Kuai <yukuai1@...weicloud.com>
Cc:     hch@...radead.org, ming.lei@...hat.com, axboe@...nel.dk,
        roger.pau@...rix.com, colyli@...e.de, kent.overstreet@...il.com,
        joern@...ybastard.org, miquel.raynal@...tlin.com, richard@....at,
        vigneshr@...com, sth@...ux.ibm.com, hoeppner@...ux.ibm.com,
        hca@...ux.ibm.com, gor@...ux.ibm.com, agordeev@...ux.ibm.com,
        jejb@...ux.ibm.com, martin.petersen@...cle.com, clm@...com,
        josef@...icpanda.com, dsterba@...e.com, brauner@...nel.org,
        nico@...xnic.net, xiang@...nel.org, chao@...nel.org, tytso@....edu,
        adilger.kernel@...ger.ca, agruenba@...hat.com, jack@...e.com,
        konishi.ryusuke@...il.com, dchinner@...hat.com,
        linux@...ssschuh.net, min15.li@...sung.com, yukuai3@...wei.com,
        dlemoal@...nel.org, willy@...radead.org, akpm@...ux-foundation.org,
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        linux-kernel@...r.kernel.org, xen-devel@...ts.xenproject.org,
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        linux-fsdevel@...r.kernel.org, linux-erofs@...ts.ozlabs.org,
        linux-ext4@...r.kernel.org, gfs2@...ts.linux.dev,
        linux-nilfs@...r.kernel.org, yi.zhang@...wei.com,
        yangerkun@...wei.com
Subject: Re: [PATCH block/for-next v2 00/16] block: remove field 'bd_inode'
 from block_device

On Mon, Nov 27, 2023 at 02:21:00PM +0800, Yu Kuai wrote:
> From: Yu Kuai <yukuai3@...wei.com>
> 
> Changes in v2:
>  - split different portions into different patches, as greg k-h
>  suggested.
>  - use container_of() instead of "bdev + 1" to get the address of
>  bd_inode in the new helper, as grep k-h suggested.

You might have misinterpreted gregkh - in your place I would rather
do a one-patch never-rebased branch (introduction of bdev_inode() in
form that returns bdev->bd_inode), with followup in your branch that
switches it to your variant.  Then conversions of ->bd_inode users,
to be either picked by individual filesystems of staying in your branch.
Any filesystem tree could merge from your never-rebased branch, after
which they could switch their ->bd_inode uses to the new helper, without
introducing any bisection hazards or interdependencies.
After the next -rc1, once all ->bd_inode users are gone from the tree -
remove the field.

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