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Subject: Re: [PATCH 07/29] target/iblock: use bdev_nr_sectors instead of open
 coding it
To:     Christoph Hellwig <hch@lst.de>, Jens Axboe <axboe@kernel.dk>
Cc:     Coly Li <colyli@suse.de>, Mike Snitzer <snitzer@redhat.com>,
        Song Liu <song@kernel.org>, David Sterba <dsterba@suse.com>,
        Josef Bacik <josef@toxicpanda.com>,
        Theodore Ts'o <tytso@mit.edu>,
        OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>,
        Dave Kleikamp <shaggy@kernel.org>,
        Ryusuke Konishi <konishi.ryusuke@gmail.com>,
        Anton Altaparmakov <anton@tuxera.com>,
        Konstantin Komarov <almaz.alexandrovich@paragon-software.com>,
        Kees Cook <keescook@chromium.org>,
        Phillip Lougher <phillip@squashfs.org.uk>,
        Jan Kara <jack@suse.com>, linux-block@vger.kernel.org,
        dm-devel@redhat.com, drbd-dev@lists.linbit.com,
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References: <20211013051042.1065752-1-hch@lst.de>
 <20211013051042.1065752-8-hch@lst.de>
From:   Bodo Stroesser <bostroesser@gmail.com>
Message-ID: <3babe7ca-cf08-fd19-6793-39f6d78bca12@gmail.com>
Date:   Wed, 13 Oct 2021 11:31:11 +0200
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On 13.10.21 07:10, Christoph Hellwig wrote:
> Use the proper helper to read the block device size.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
>   drivers/target/target_core_iblock.c | 5 +++--
>   1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/target/target_core_iblock.c b/drivers/target/target_core_iblock.c
> index 31df20abe141f..ab7f5678ebc44 100644
> --- a/drivers/target/target_core_iblock.c
> +++ b/drivers/target/target_core_iblock.c
> @@ -232,8 +232,9 @@ static unsigned long long iblock_emulate_read_cap_with_block_size(
>   	struct block_device *bd,
>   	struct request_queue *q)
>   {
> -	unsigned long long blocks_long = (div_u64(i_size_read(bd->bd_inode),
> -					bdev_logical_block_size(bd)) - 1);
> +	loff_t size = bdev_nr_sectors(bd) << SECTOR_SHIFT;
> +	unsigned long long blocks_long =
> +		div_u64(size, bdev_logical_block_size(bd)) - 1;
>   	u32 block_size = bdev_logical_block_size(bd);

To enhance readability, would it make sense to shift the new lines
behind "u32 block_size = ...", so block_size can be used in div_u64
instead of using bdev_logical_block_size twice?

>   
>   	if (block_size == dev->dev_attrib.block_size)
>