8a4c6e19cf
These are only needed by nfs-utils. But I needed to remind myself how they worked recently and thought this might be helpful. It's short and incomplete for now as I was only interested in startup, shutdown, and configuration of listening sockets. Signed-off-by: J. Bruce Fields <bfields@redhat.com>
41 lines
1.4 KiB
Text
41 lines
1.4 KiB
Text
Administrative interfaces for nfsd
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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Note that normally these interfaces are used only by the utilities in
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nfs-utils.
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nfsd is controlled mainly by pseudofiles under the "nfsd" filesystem,
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which is normally mounted at /proc/fs/nfsd/.
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The server is always started by the first write of a nonzero value to
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nfsd/threads.
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Before doing that, NFSD can be told which sockets to listen on by
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writing to nfsd/portlist; that write may be:
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- an ascii-encoded file descriptor, which should refer to a
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bound (and listening, for tcp) socket, or
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- "transportname port", where transportname is currently either
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"udp", "tcp", or "rdma".
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If nfsd is started without doing any of these, then it will create one
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udp and one tcp listener at port 2049 (see nfsd_init_socks).
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On startup, nfsd and lockd grace periods start.
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nfsd is shut down by a write of 0 to nfsd/threads. All locks and state
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are thrown away at that point.
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Between startup and shutdown, the number of threads may be adjusted up
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or down by additional writes to nfsd/threads or by writes to
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nfsd/pool_threads.
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For more detail about files under nfsd/ and what they control, see
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fs/nfsd/nfsctl.c; most of them have detailed comments.
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Implementation notes
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^^^^^^^^^^^^^^^^^^^^
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Note that the rpc server requires the caller to serialize addition and
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removal of listening sockets, and startup and shutdown of the server.
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For nfsd this is done using nfsd_mutex.
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