Merge patch series "iomap: trivial fixes for ext4 conversion"

Zhang Yi <yi.zhang@huaweicloud.com> says:

This patch series contains a few trivial iomap-related fixes in
preparation for converting ext4 buffered I/O to use iomap.

The first three patches are taken from my ext4 conversion series [1], as
suggested by Christoph. The fourth patch fixes a bug originally reported
by Sashiko during review of my series; although unrelated to the ext4
conversion, it is worth fixing on its own. Please see the following
patches for detail. The fifth patch add comments for
ifs_clear/set_range_dirty(), and the last patch avoids merging ioends
that have different private data.

[1] https://lore.kernel.org/linux-ext4/20260511072344.191271-1-yi.zhang@huaweicloud.com/

* patches from https://patch.msgid.link/20260714082325.325163-1-yi.zhang@huaweicloud.com:
  iomap: add comments for ifs_clear/set_range_dirty()
  iomap: fix out-of-bounds bitmap_set() with zero-length range
  iomap: fix incorrect did_zero setting in iomap_zero_iter()
  iomap: support invalidating partial folios
  iomap: correct the range of a partial dirty clear

Link: https://patch.msgid.link/20260714082325.325163-1-yi.zhang@huaweicloud.com
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>