[GIT PULL] iomap: fix unshare data corruption bug

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Hi Linus,

Please pull this branch with changes for iomap for 6.6-rc3.

As usual, I did a test-merge with the main upstream branch as of a few
minutes ago, and didn't see any conflicts.  Please let me know if you
encounter any problems.


The following changes since commit 0bb80ecc33a8fb5a682236443c1e740d5c917d1d:

Linux 6.6-rc1 (2023-09-10 16:28:41 -0700)

are available in the Git repository at:

https://git.kernel.org/pub/scm/fs/xfs/xfs-linux.git tags/iomap-6.6-fixes-2

for you to fetch changes up to a5f31a5028d1e88e97c3b6cdc3e3bf2da085e232:

iomap: convert iomap_unshare_iter to use large folios (2023-09-19 09:05:35 -0700)

Fixes for 6.6-rc3:

* Return EIO on bad inputs to iomap_to_bh instead of BUGging, to deal
less poorly with block device io racing with block device resizing.
* Fix a stale page data exposure bug introduced in 6.6-rc1 when
unsharing a file range that is not in the page cache.

Signed-off-by: Darrick J. Wong <djwong@xxxxxxxxxx>

Christoph Hellwig (1):
iomap: handle error conditions more gracefully in iomap_to_bh

Darrick J. Wong (2):
iomap: don't skip reading in !uptodate folios when unsharing a range
iomap: convert iomap_unshare_iter to use large folios

fs/buffer.c            | 25 ++++++++++++++-----------
fs/iomap/buffered-io.c | 30 ++++++++++++++++++------------
2 files changed, 32 insertions(+), 23 deletions(-)

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