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6304affe45
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>
140 lines
2.9 KiB
140 lines
2.9 KiB