[PATCH v7 00/11] reflink and atomic write bugs

[Chris Mason <mason@kernel.org>]

This series did a few rounds privately, but looks ready for the list
now.  Carlos has accepted patches 1-4, but I've kept them here so the
whole series can still be tested.

Except for Christoph's patch, these were all found and fixed
by an LLM.

The meat of the series is fixing reflink corner cases that incorrectly
let you write into the source of a reflink.  LLMs also tripped over a
few ways to use atomic writes to expose stale blocks on the drive, and a
few races with realtime flag manipulations.

v6->v7:

Sashiko noticed a few pre-existing corners that I had ignored, so we
have 3 additional patches dealing with races between FS_IOC_FSSETXATTR
and decisions about file writes.

"xfs: restart faults racing with realtime flag changes" changed enough
that I dropped Christoph's review.

Chris Mason (10):
  xfs: don't skip the flush before shifting extents
  xfs: flush the shifted range before changing the file
  xfs: don't change the block map under a dirty folio
  iomap: don't punch delalloc under a dirty EOF block
  fs: validate atomic writes after O_APPEND and limits
  xfs: recheck direct write alignment after write checks
  xfs: test for reflink after the dio write checks
  xfs: test for always COW after the dio write checks
  xfs: refuse fallocate racing with realtime flag changes
  xfs: restart faults racing with realtime flag changes

Christoph Hellwig (1):
  xfs: refuse writes to files racing with realtime inode flag changes

 fs/ext4/file.c         |   4 -
 fs/iomap/buffered-io.c |  34 ++++++++-
 fs/read_write.c        |  13 ++++
 fs/xfs/xfs_bmap_util.c |  19 ++++-
 fs/xfs/xfs_file.c      | 167 ++++++++++++++++++++++++++++++++---------
 fs/xfs/xfs_iomap.c     |  40 +++++++++-
 fs/xfs/xfs_reflink.c   |   2 +-
 7 files changed, 230 insertions(+), 49 deletions(-)


base-commit: 7475ea8b58616b33c04afb976cf0fbaad9dd63fb
--
2.55.0