linux-ext4 - Re: [PATCH 02/30] block: add a bdev_nr

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Date:   Fri, 15 Oct 2021 14:37:41 +0000
From:   Anton Altaparmakov <anton@...era.com>
To:     Christoph Hellwig <hch@....de>
CC:     Jens Axboe <axboe@...nel.dk>, Coly Li <colyli@...e.de>,
        Mike Snitzer <snitzer@...hat.com>, Song Liu <song@...nel.org>,
        David Sterba <dsterba@...e.com>,
        Josef Bacik <josef@...icpanda.com>,
        Theodore Ts'o <tytso@....edu>,
        OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>,
        Dave Kleikamp <shaggy@...nel.org>,
        Ryusuke Konishi <konishi.ryusuke@...il.com>,
        "Konstantin Komarov" <almaz.alexandrovich@...agon-software.com>,
        Kees Cook <keescook@...omium.org>,
        Phillip Lougher <phillip@...ashfs.org.uk>,
        Jan Kara <jack@...e.com>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
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Subject: Re: [PATCH 02/30] block: add a bdev_nr_bytes helper

Hi Christoph,

> On 15 Oct 2021, at 14:26, Christoph Hellwig <hch@....de> wrote:
> 
> Add a helpe to query the size of a block device in bytes.  This
> will be used to remove open coded access to ->bd_inode.

Matthew already pointed out the return type for bdev_nr_bytes() but also your commit message has a typo: "Add a helpe" -> "Add a helper".

Best regards,

	Anton

> Signed-off-by: Christoph Hellwig <hch@....de>
> ---
> include/linux/genhd.h | 7 ++++++-
> 1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/include/linux/genhd.h b/include/linux/genhd.h
> index 082a3e5fd8fa1..f67db3c5a04b3 100644
> --- a/include/linux/genhd.h
> +++ b/include/linux/genhd.h
> @@ -235,9 +235,14 @@ static inline sector_t get_start_sect(struct block_device *bdev)
> 	return bdev->bd_start_sect;
> }
> 
> +static inline sector_t bdev_nr_bytes(struct block_device *bdev)
> +{
> +	return i_size_read(bdev->bd_inode);
> +}
> +
> static inline sector_t bdev_nr_sectors(struct block_device *bdev)
> {
> -	return i_size_read(bdev->bd_inode) >> 9;
> +	return bdev_nr_bytes(bdev) >> SECTOR_SHIFT;
> }
> 
> static inline sector_t get_capacity(struct gendisk *disk)
> -- 
> 2.30.2
>