linux-ext4 - Re: don't use ->bd_inode to access the block device size

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Message-ID: <6d96d52b-3a19-8e00-4089-c2483a4cdbcc@oracle.com>
Date:   Wed, 13 Oct 2021 15:14:55 +0800
From:   Anand Jain <anand.jain@...cle.com>
To:     Christoph Hellwig <hch@....de>, Jens Axboe <axboe@...nel.dk>
Cc:     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>,
        Anton Altaparmakov <anton@...era.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,
        dm-devel@...hat.com, drbd-dev@...ts.linbit.com,
        linux-bcache@...r.kernel.org, linux-raid@...r.kernel.org,
        linux-mtd@...ts.infradead.org, linux-nvme@...ts.infradead.org,
        linux-scsi@...r.kernel.org, target-devel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-btrfs@...r.kernel.org,
        linux-ext4@...r.kernel.org, jfs-discussion@...ts.sourceforge.net,
        linux-nfs@...r.kernel.org, linux-nilfs@...r.kernel.org,
        linux-ntfs-dev@...ts.sourceforge.net, ntfs3@...ts.linux.dev,
        reiserfs-devel@...r.kernel.org
Subject: Re: don't use ->bd_inode to access the block device size

On 13/10/2021 13:10, Christoph Hellwig wrote:
> Hi Jens,
> 
> various drivers currently poke directy at the block device inode, which
> is a bit of a mess.  This series cleans up the places that read the
> block device size to use the proper helpers.  I have separate patches
> for many of the other bd_inode uses, but this series is already big
> enough as-is,
> 
> I wondered about adding a helper for looking at the size in byte units
> to avoid the SECTOR_SHIFT shifts in various places.  But given that
> I could not come up with a good name and 


> block devices fundamentally
> work in sector size granularity I decided against that.

Yes.  However,  POV of its usage outside the block-layer, a wrapper 
helper is a lot better. No.? If you agree, how about naming it bdev_size()?

Thanks, Anand

> 
> Diffstat:
>   block/fops.c                        |    2 +-
>   drivers/block/drbd/drbd_int.h       |    3 +--
>   drivers/md/bcache/super.c           |    2 +-
>   drivers/md/bcache/util.h            |    4 ----
>   drivers/md/bcache/writeback.c       |    2 +-
>   drivers/md/dm-bufio.c               |    2 +-
>   drivers/md/dm-cache-metadata.c      |    2 +-
>   drivers/md/dm-cache-target.c        |    2 +-
>   drivers/md/dm-clone-target.c        |    2 +-
>   drivers/md/dm-dust.c                |    5 ++---
>   drivers/md/dm-ebs-target.c          |    2 +-
>   drivers/md/dm-era-target.c          |    2 +-
>   drivers/md/dm-exception-store.h     |    2 +-
>   drivers/md/dm-flakey.c              |    3 +--
>   drivers/md/dm-integrity.c           |    6 +++---
>   drivers/md/dm-linear.c              |    3 +--
>   drivers/md/dm-log-writes.c          |    4 ++--
>   drivers/md/dm-log.c                 |    2 +-
>   drivers/md/dm-mpath.c               |    2 +-
>   drivers/md/dm-raid.c                |    6 +++---
>   drivers/md/dm-switch.c              |    2 +-
>   drivers/md/dm-table.c               |    3 +--
>   drivers/md/dm-thin-metadata.c       |    2 +-
>   drivers/md/dm-thin.c                |    2 +-
>   drivers/md/dm-verity-target.c       |    3 +--
>   drivers/md/dm-writecache.c          |    2 +-
>   drivers/md/dm-zoned-target.c        |    2 +-
>   drivers/md/md.c                     |   26 +++++++++++---------------
>   drivers/mtd/devices/block2mtd.c     |    5 +++--
>   drivers/nvme/target/io-cmd-bdev.c   |    4 ++--
>   drivers/target/target_core_iblock.c |    5 +++--
>   fs/affs/super.c                     |    2 +-
>   fs/btrfs/dev-replace.c              |    2 +-
>   fs/btrfs/disk-io.c                  |    3 ++-
>   fs/btrfs/ioctl.c                    |    4 ++--
>   fs/btrfs/volumes.c                  |    7 ++++---
>   fs/buffer.c                         |    4 ++--
>   fs/cramfs/inode.c                   |    2 +-
>   fs/ext4/super.c                     |    2 +-
>   fs/fat/inode.c                      |    5 +----
>   fs/hfs/mdb.c                        |    2 +-
>   fs/hfsplus/wrapper.c                |    2 +-
>   fs/jfs/resize.c                     |    5 ++---
>   fs/jfs/super.c                      |    5 ++---
>   fs/nfs/blocklayout/dev.c            |    4 ++--
>   fs/nilfs2/ioctl.c                   |    2 +-
>   fs/nilfs2/super.c                   |    2 +-
>   fs/nilfs2/the_nilfs.c               |    3 ++-
>   fs/ntfs/super.c                     |    8 +++-----
>   fs/ntfs3/super.c                    |    3 +--
>   fs/pstore/blk.c                     |    4 ++--
>   fs/reiserfs/super.c                 |    7 ++-----
>   fs/squashfs/super.c                 |    5 +++--
>   fs/udf/lowlevel.c                   |    5 ++---
>   fs/udf/super.c                      |    9 +++------
>   include/linux/genhd.h               |    6 ++++++
>   56 files changed, 100 insertions(+), 117 deletions(-)
>