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97169cd6d9
The copy_file_range syscall can improve copy performance by cloning extents between cpio archive source and destination files. Existing read / write based copy logic is retained for fallback in case the copy_file_range syscall is unsupported or unavailable due to cross-filesystem EXDEV, etc. Clone or reflink, as opposed to copy, of source file extents into the output cpio archive may (e.g. on Btrfs and XFS) require alignment of the output to the filesystem block size. This could be achieved by inserting padding entries into the cpio archive manifest. Signed-off-by: David Disseldorp <ddiss@suse.de> Reviewed-by: Nicolas Schier <nsc@kernel.org> Link: https://lore.kernel.org/r/20250819032607.28727-4-ddiss@suse.de Signed-off-by: Nathan Chancellor <nathan@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.