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This change effectively reverts commit586b286b11("dm crypt: constrain crypt device's max_segment_size to PAGE_SIZE") and relies on block core's late bio-splitting to ensure that dm-crypt's encryption bios are split accordingly if they exceed the underlying device's limits (e.g. max_segment_size). Commit586b286b11was applied as a 4.3 fix for the benefit of stable@ kernels 4.0+ just after block core's late bio-splitting was introduced in 4.3 with commit54efd50bfd("block: make generic_make_request handle arbitrarily sized bios"). Given block core's late bio-splitting it is past time that dm-crypt make use of it. Also, given the recent need to revert meaningful progress that was attempted during the 6.9 merge window (see commitbff4b74625Revert "dm: use queue_limits_set") this change allows DM core to safely make use of queue_limits_set() without risk of breaking dm-crypt on NVMe. Though it should be noted this commit isn't a prereq for reinstating DM core's use of queue_limits_set() because blk_validate_limits() was made less strict with commitb561ea56a2("block: allow device to have both virt_boundary_mask and max segment size"). Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Mikulas Patocka <mpatocka@redhat.com> Reviewed-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: Mike Snitzer <snitzer@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.