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Add 'io_cache_read' to NFSD's debugfs interface so that any data read by NFSD will either be: - cached using page cache (NFSD_IO_BUFFERED=0) - cached but removed from the page cache upon completion (NFSD_IO_DONTCACHE=1). io_cache_read may be set by writing to: /sys/kernel/debug/nfsd/io_cache_read Add 'io_cache_write' to NFSD's debugfs interface so that any data written by NFSD will either be: - cached using page cache (NFSD_IO_BUFFERED=0) - cached but removed from the page cache upon completion (NFSD_IO_DONTCACHE=1). io_cache_write may be set by writing to: /sys/kernel/debug/nfsd/io_cache_write The default value for both settings is NFSD_IO_BUFFERED, which is NFSD's existing behavior for both read and write. Changes to these settings take immediate effect for all exports and NFS versions. Currently only xfs and ext4 implement RWF_DONTCACHE. For file systems that do not implement RWF_DONTCACHE, NFSD use only buffered I/O when the io_cache setting is NFSD_IO_DONTCACHE. Signed-off-by: Mike Snitzer <snitzer@kernel.org> Reviewed-by: Jeff Layton <jlayton@kernel.org> Signed-off-by: Chuck Lever <chuck.lever@oracle.com> |
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| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| rust | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .clippy.toml | ||
| .cocciconfig | ||
| .editorconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .pylintrc | ||
| .rustfmt.toml | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
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.