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Previously for btrfs with sector size smaller than page size (subpage), we only allow compression if the range is fully page aligned. This is to work around the asynchronous submission of compressed range, which delayed the page unlock and writeback into a workqueue, furthermore asynchronous submission can lock multiple sector range across page boundary. Such asynchronous submission makes it very hard to co-operate with other regular writes. With the recent changes to the subpage folio unlock path, now asynchronous submission of compressed pages can co-operate with regular submission, so enable sector perfect compression if it's an experimental build. The ETA for moving this feature out of experimental is 6.15, and I hope all remaining corner cases can be exposed before that. Signed-off-by: Qu Wenruo <wqu@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
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.