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From: Kees Cook <keescook@chromium.org>
To: Christoph Hellwig <hch@lst.de>
Cc: Jens Axboe <axboe@kernel.dk>, 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>,
	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, linux-bcache@vger.kernel.org,
	linux-raid@vger.kernel.org, linux-mtd@lists.infradead.org,
	linux-nvme@lists.infradead.org, linux-scsi@vger.kernel.org,
	target-devel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	linux-btrfs@vger.kernel.org, linux-ext4@vger.kernel.org,
	jfs-discussion@lists.sourceforge.net, linux-nfs@vger.kernel.org,
	linux-nilfs@vger.kernel.org,
	linux-ntfs-dev@lists.sourceforge.net, ntfs3@lists.linux.dev,
	reiserfs-devel@vger.kernel.org
Subject: Re: don't use ->bd_inode to access the block device size
Date: Tue, 12 Oct 2021 23:39:25 -0700	[thread overview]
Message-ID: <202110122335.19348E8E8@keescook> (raw)
In-Reply-To: <20211013051042.1065752-1-hch@lst.de>

On Wed, Oct 13, 2021 at 07:10:13AM +0200, Christoph Hellwig wrote:
> 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.

Without something like bdev_nr_bytes(), this series has 13 of 29 patches
actually _adding_ an open-coded calculation:

[PATCH 05/29] mtd/block2mtd: use bdev_nr_sectors instead of open coding it
[PATCH 06/29] nvmet: use bdev_nr_sectors instead of open coding it
[PATCH 07/29] target/iblock: use bdev_nr_sectors instead of open coding it
[PATCH 08/29] fs: use bdev_nr_sectors instead of open coding it in blkdev_max_block
[PATCH 11/29] btrfs: use bdev_nr_sectors instead of open coding it
[PATCH 16/29] jfs: use bdev_nr_sectors instead of open coding it
[PATCH 17/29] nfs/blocklayout: use bdev_nr_sectors instead of open coding it
[PATCH 18/29] nilfs2: use bdev_nr_sectors instead of open coding it
[PATCH 19/29] ntfs3: use bdev_nr_sectors instead of open coding it
[PATCH 20/29] pstore/blk: use bdev_nr_sectors instead of open coding it
[PATCH 21/29] reiserfs: use bdev_nr_sectors instead of open coding it
[PATCH 22/29] squashfs: use bdev_nr_sectors instead of open coding it
[PATCH 23/29] block: use bdev_nr_sectors instead of open coding it in blkdev_fallocate

I think it's well worth having that helper (or at least leaving these
alone). Otherwise, this is a lot of churn without a clear net benefit,
IMO.

The others look good to me, though!

-Kees

>
> 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(-)

--
Kees Cook

  parent reply	other threads:[~2021-10-13  6:39 UTC|newest]

Thread overview: 76+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-10-13  5:10 Christoph Hellwig
2021-10-13  5:10 ` [PATCH 01/29] bcache: remove bdev_sectors Christoph Hellwig
2021-10-13  5:21   ` Coly Li
2021-10-13  6:09   ` Kees Cook
2021-10-13  5:10 ` [PATCH 02/29] drbd: use bdev_nr_sectors instead of open coding it Christoph Hellwig
2021-10-13  6:09   ` Kees Cook
2021-10-13 22:33   ` Chaitanya Kulkarni
2021-10-13  5:10 ` [PATCH 03/29] dm: " Christoph Hellwig
2021-10-13  6:10   ` Kees Cook
2021-10-13 16:43   ` Mike Snitzer
2021-10-13  5:10 ` [PATCH 04/29] md: " Christoph Hellwig
2021-10-13  6:12   ` Kees Cook
2021-10-13 21:14     ` Song Liu
2021-10-13  5:10 ` [PATCH 05/29] mtd/block2mtd: " Christoph Hellwig
2021-10-13  5:10 ` [PATCH 06/29] nvmet: " Christoph Hellwig
2021-10-13 22:33   ` Chaitanya Kulkarni
2021-10-13  5:10 ` [PATCH 07/29] target/iblock: " Christoph Hellwig
2021-10-13  9:31   ` Bodo Stroesser
2021-10-13 22:37   ` Chaitanya Kulkarni
2021-10-13  5:10 ` [PATCH 08/29] fs: use bdev_nr_sectors instead of open coding it in blkdev_max_block Christoph Hellwig
2021-10-13 10:42   ` Jan Kara
2021-10-13 22:35   ` Chaitanya Kulkarni
2021-10-13  5:10 ` [PATCH 09/29] fs: simplify init_page_buffers Christoph Hellwig
2021-10-13  6:14   ` Kees Cook
2021-10-13 10:42   ` Jan Kara
2021-10-13  5:10 ` [PATCH 10/29] affs: use bdev_nr_sectors instead of open coding it Christoph Hellwig
2021-10-13  6:14   ` Kees Cook
2021-10-13  5:10 ` [PATCH 11/29] btrfs: " Christoph Hellwig
2021-10-13  7:08   ` Anand Jain
2021-10-13 22:36   ` Chaitanya Kulkarni
2021-10-14  2:44   ` Keith Busch
2021-10-13  5:10 ` [PATCH 12/29] cramfs: " Christoph Hellwig
2021-10-13  6:16   ` Kees Cook
2021-10-13  5:10 ` [PATCH 13/29] fat: " Christoph Hellwig
2021-10-13  6:16   ` Kees Cook
2021-10-13  5:10 ` [PATCH 14/29] hfs: " Christoph Hellwig
2021-10-13  6:16   ` Kees Cook
2021-10-13  5:10 ` [PATCH 15/29] hfsplus: " Christoph Hellwig
2021-10-13  6:16   ` Kees Cook
2021-10-13  5:10 ` [PATCH 16/29] jfs: " Christoph Hellwig
2021-10-13 14:13   ` Dave Kleikamp
2021-10-13  5:10 ` [PATCH 17/29] nfs/blocklayout: " Christoph Hellwig
2021-10-13  5:10 ` [PATCH 18/29] nilfs2: " Christoph Hellwig
2021-10-13  5:10 ` [PATCH 19/29] ntfs3: " Christoph Hellwig
2021-10-13  5:10 ` [PATCH 20/29] pstore/blk: " Christoph Hellwig
2021-10-13  5:10 ` [PATCH 21/29] reiserfs: " Christoph Hellwig
2021-10-13 10:43   ` Jan Kara
2021-10-13  5:10 ` [PATCH 22/29] squashfs: " Christoph Hellwig
2021-10-13 19:37   ` Phillip Lougher
2021-10-13  5:10 ` [PATCH 23/29] block: use bdev_nr_sectors instead of open coding it in blkdev_fallocate Christoph Hellwig
2021-10-13 10:44   ` Jan Kara
2021-10-13 22:34   ` Chaitanya Kulkarni
2021-10-13  5:10 ` [PATCH 24/29] block: add a sb_bdev_nr_blocks helper Christoph Hellwig
2021-10-13  6:27   ` Kees Cook
2021-10-13  5:10 ` [PATCH 25/29] ext4: use sb_bdev_nr_blocks Christoph Hellwig
2021-10-13  6:29   ` Kees Cook
2021-10-13  6:30   ` Kees Cook
2021-10-13 10:46   ` Jan Kara
2021-10-13 15:51   ` Theodore Ts'o
2021-10-13  5:10 ` [PATCH 26/29] jfs: " Christoph Hellwig
2021-10-13  6:31   ` Kees Cook
2021-10-13  5:10 ` [PATCH 27/29] ntfs: " Christoph Hellwig
2021-10-13  6:33   ` Kees Cook
2021-10-13  5:10 ` [PATCH 28/29] reiserfs: " Christoph Hellwig
2021-10-13  6:33   ` Kees Cook
2021-10-13 10:46   ` Jan Kara
2021-10-13  5:10 ` [PATCH 29/29] udf: " Christoph Hellwig
2021-10-13  6:34   ` Kees Cook
2021-10-13 10:47   ` Jan Kara
2021-10-13  6:39 ` Kees Cook [this message]
2021-10-13  7:14 ` don't use ->bd_inode to access the block device size Anand Jain
2021-10-14  6:28 ` Christoph Hellwig
2021-10-14  9:32   ` Anton Altaparmakov
2021-10-14 13:13     ` Dave Kleikamp
2021-10-14 15:14       ` Kees Cook
2021-10-14 15:35         ` Wol

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