linux-kernel - Re: [PATCH block/for-next v2 07/16] bcachefs: use new helper to get inode from block

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Message-ID: <d3b87b87-2ca7-43ca-9fb4-ee3696561eb5@kernel.org>
Date:   Mon, 27 Nov 2023 16:09:47 +0900
From:   Damien Le Moal <dlemoal@...nel.org>
To:     Yu Kuai <yukuai1@...weicloud.com>, 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, viro@...iv.linux.org.uk, brauner@...nel.org,
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Cc:     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,
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        yi.zhang@...wei.com, yangerkun@...wei.com
Subject: Re: [PATCH block/for-next v2 07/16] bcachefs: use new helper to get
 inode from block_device

On 11/27/23 15:21, Yu Kuai wrote:
> From: Yu Kuai <yukuai3@...wei.com>
> 
> Which is more efficiency, and also prepare to remove the field
> 'bd_inode' from block_device.
> 
> Signed-off-by: Yu Kuai <yukuai3@...wei.com>
> ---
>  fs/bcachefs/util.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/bcachefs/util.h b/fs/bcachefs/util.h
> index 2984b57b2958..fe7ccb3a3517 100644
> --- a/fs/bcachefs/util.h
> +++ b/fs/bcachefs/util.h
> @@ -518,7 +518,7 @@ int bch2_bio_alloc_pages(struct bio *, size_t, gfp_t);
>  
>  static inline sector_t bdev_sectors(struct block_device *bdev)
>  {
> -	return bdev->bd_inode->i_size >> 9;
> +	return bdev_inode(bdev)->i_size >> 9;

shouldn't this use i_size_read() ?

I missed the history with this but why not use bdev_nr_sectors() and delete this
helper ?

>  }
>  
>  #define closure_bio_submit(bio, cl)					\

-- 
Damien Le Moal
Western Digital Research