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: <20231127072409.y22jkynrchm4tkd2@moria.home.lan>
Date:   Mon, 27 Nov 2023 02:24:09 -0500
From:   Kent Overstreet <kent.overstreet@...ux.dev>
To:     Damien Le Moal <dlemoal@...nel.org>
Cc:     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,
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Subject: Re: [PATCH block/for-next v2 07/16] bcachefs: use new helper to get
 inode from block_device

On Mon, Nov 27, 2023 at 04:09:47PM +0900, Damien Le Moal wrote:
> 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 ?

Actually, this helper seems to be dead code.