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Message-ID: <20231211165217.fil437byq7w2vcp7@quack3>
Date:   Mon, 11 Dec 2023 17:52:17 +0100
From:   Jan Kara <jack@...e.cz>
To:     Yu Kuai <yukuai1@...weicloud.com>
Cc:     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, viro@...iv.linux.org.uk, 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, willy@...radead.org,
        akpm@...ux-foundation.org, p.raghav@...sung.com, hare@...e.de,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        xen-devel@...ts.xenproject.org, linux-bcache@...r.kernel.org,
        linux-mtd@...ts.infradead.org, linux-s390@...r.kernel.org,
        linux-scsi@...r.kernel.org, linux-bcachefs@...r.kernel.org,
        linux-btrfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-erofs@...ts.ozlabs.org, linux-ext4@...r.kernel.org,
        gfs2@...ts.linux.dev, linux-nilfs@...r.kernel.org,
        yukuai3@...wei.com, yi.zhang@...wei.com, yangerkun@...wei.com
Subject: Re: [PATCH RFC v2 for-6.8/block 01/18] block: add some bdev apis

On Mon 11-12-23 22:05:35, Yu Kuai wrote:
> From: Yu Kuai <yukuai3@...wei.com>
> 
> Those apis will be used for other modules, so that bd_inode won't be
> accessed directly from other modules.
> 
> Signed-off-by: Yu Kuai <yukuai3@...wei.com>

...

> +void bdev_associated_mapping(struct block_device *bdev,
> +			     struct address_space *mapping)
> +{
> +	mapping->host = bdev->bd_inode;
> +}

Here I'm not sure - is the helper really a win? It seems a bit obscure to
me. This initialization of another mapping for a bdev looks really special.

								Honza
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR

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