[PATCH v5 00/20] bio: check return values of bio_add_page

[Johannes Thumshirn <johannes.thumshirn@wdc.com>]

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 v4:
- Rebased onto latest Linus' master
- Dropped already merged patches
- Added Sergey's Reviewed-by

Changes to v3:
- Added __bio_add_folio and use it in iomap (Willy)
- Mark bio_add_folio must check (Willy)
- s/GFS/GFS2/ (Andreas)

Changes to v2:
- Removed 'wont fail' comments pointed out by Song

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 (20):
  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
  jfs: logmgr: use __bio_add_page to add single page to bio
  gfs2: 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
  block: add __bio_add_folio
  fs: iomap: use __bio_add_folio where possible
  block: mark bio_add_folio as __must_check

 block/bio.c                      |  8 ++++++++
 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            | 11 ++++++-----
 drivers/md/raid1.c               |  7 +++++--
 drivers/md/raid10.c              | 20 ++++++++++----------
 drivers/md/raid5-cache.c         |  2 +-
 drivers/md/raid5-ppl.c           |  4 ++--
 fs/buffer.c                      |  2 +-
 fs/gfs2/ops_fstype.c             |  2 +-
 fs/iomap/buffered-io.c           |  6 +++---
 fs/jfs/jfs_logmgr.c              |  4 ++--
 fs/zonefs/super.c                |  2 +-
 include/linux/bio.h              |  5 +++--
 mm/page_io.c                     |  8 ++++----
 19 files changed, 63 insertions(+), 45 deletions(-)


base-commit: 865fdb08197e657c59e74a35fa32362b12397f58
-- 
2.40.0