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When NFSD_IO_DIRECT is selected via the /sys/kernel/debug/nfsd/io_cache_write experimental tunable, split incoming unaligned NFS WRITE requests into a prefix, middle and suffix segment, as needed. The middle segment is now DIO-aligned and the prefix and/or suffix are unaligned. Synchronous buffered IO is used for the unaligned segments, and IOCB_DIRECT is used for the middle DIO-aligned extent. Although IOCB_DIRECT avoids the use of the page cache, by itself it doesn't guarantee data durability. For UNSTABLE WRITE requests, durability is obtained by a subsequent NFS COMMIT request. Signed-off-by: Mike Snitzer <snitzer@kernel.org> Co-developed-by: Chuck Lever <chuck.lever@oracle.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Chuck Lever <chuck.lever@oracle.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.