[PATCH v2 00/19] bio: check return values of bio_add_page

From: Johannes Thumshirn <johannes.thumshirn@wdc.com>
To: Jens Axboe <axboe@kernel.dk>
Cc: Christoph Hellwig <hch@lst.de>, Hannes Reinecke <hare@suse.de>,
	Chaitanya Kulkarni <kch@nvidia.com>,
	Damien Le Moal <damien.lemoal@wdc.com>,
	Ming Lei <ming.lei@redhat.com>,
	linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	linux-mm@kvack.org, dm-devel@redhat.com,
	Song Liu <song@kernel.org>,
	linux-raid@vger.kernel.org, Mike Snitzer <snitzer@kernel.org>,
	Matthew Wilcox <willy@infradead.org>,
	Dave Kleikamp <shaggy@kernel.org>,
	jfs-discussion@lists.sourceforge.net, cluster-devel@redhat.com,
	Bob Peterson <rpeterso@redhat.com>,
	Andreas Gruenbacher <agruenba@redhat.com>,
	David Sterba <dsterba@suse.com>,
	linux-btrfs@vger.kernel.org,
	Johannes Thumshirn <johannes.thumshirn@wdc.com>
Subject: [PATCH v2 00/19] bio: check return values of bio_add_page
Date: Thu, 30 Mar 2023 03:43:42 -0700	[thread overview]
Message-ID: <cover.1680172791.git.johannes.thumshirn@wdc.com> (raw)

We have two functions for adding a page to a bio, __bio_add_page() which is
used to add a single page to a freshly created bio and bio_add_page() which is
used to add a page to an existing bio.

While __bio_add_page() is expected to succeed, bio_add_page() can fail.

This series converts the callers of bio_add_page() which can easily use
__bio_add_page() to using it and checks the return of bio_add_page() for
callers that don't work on a freshly created bio.

Lastly it marks bio_add_page() as __must_check so we don't have to go again
and audit all callers.

Changes to v1:
- Removed pointless comment pointed out by Willy
- Changed commit messages pointed out by Damien
- Colledted Damien's Reviews and Acks

Johannes Thumshirn (19):
  swap: use __bio_add_page to add page to bio
  drbd: use __bio_add_page to add page to bio
  dm: dm-zoned: use __bio_add_page for adding single metadata page
  fs: buffer: use __bio_add_page to add single page to bio
  md: use __bio_add_page to add single page
  md: raid5-log: use __bio_add_page to add single page
  md: raid5: use __bio_add_page to add single page to new bio
  btrfs: repair: use __bio_add_page for adding single page
  btrfs: raid56: use __bio_add_page to add single page
  jfs: logmgr: use __bio_add_page to add single page to bio
  gfs: use __bio_add_page for adding single page to bio
  zonefs: use __bio_add_page for adding single page to bio
  zram: use __bio_add_page for adding single page to bio
  floppy: use __bio_add_page for adding single page to bio
  md: check for failure when adding pages in alloc_behind_master_bio
  md: raid1: use __bio_add_page for adding single page to bio
  md: raid1: check if adding pages to resync bio fails
  dm-crypt: check if adding pages to clone bio fails
  block: mark bio_add_page as __must_check

 drivers/block/drbd/drbd_bitmap.c |  4 +---
 drivers/block/floppy.c           |  2 +-
 drivers/block/zram/zram_drv.c    |  2 +-
 drivers/md/dm-crypt.c            |  9 ++++++++-
 drivers/md/dm-zoned-metadata.c   |  6 +++---
 drivers/md/md.c                  |  4 ++--
 drivers/md/raid1-10.c            |  7 ++++++-
 drivers/md/raid1.c               |  5 +++--
 drivers/md/raid10.c              | 12 ++++++++++--
 drivers/md/raid5-cache.c         |  2 +-
 drivers/md/raid5-ppl.c           |  4 ++--
 fs/btrfs/bio.c                   |  2 +-
 fs/btrfs/raid56.c                |  2 +-
 fs/buffer.c                      |  2 +-
 fs/gfs2/ops_fstype.c             |  2 +-
 fs/jfs/jfs_logmgr.c              |  4 ++--
 fs/zonefs/super.c                |  2 +-
 include/linux/bio.h              |  2 +-
 mm/page_io.c                     |  8 ++++----
 19 files changed, 50 insertions(+), 31 deletions(-)

-- 
2.39.2