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Ports < 1024 are a scarce resource and should not be used
carelessly. Technically they should be not used at all without
registration with IANA, but sometimes we need them despite that.
So: for the socket that RPC services listen on, don't use a <1024 port
by default. There is no need.
For sockets that we send messages on, that are long-lived, and that might
need to appear 'privileged', avoid using a number that is registered in
/etc/services if possible.
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Both SM_STAT and SM_MON can return the state of an NSM, but it is
unclear which NSM they return the state of, so the value cannot be
used, and lockd doesn't use it.
Document this confusion, and give the current state to the kernel
via a sysctl if that sysctl is available (since about 2.6.19).
This should make is possible for the NFS server to detect a small
class of bad SM_NOTIFY packets and not flush locks in that case.
Signed-off-by: Neil Brown <neilb@suse.de>
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When sending an SM_NOTIFY to multi-homed host, try all the addresses
in rotation. After 4 failures on one address, try the next.
Signed-off-by: Neil Brown <neilb@suse.de>
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Make sure that sm-notify really runs only once per reboot.
Signed-off-by: Neil Brown <neilb@suse.de>
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Add sm-notify to the compile/install scripts,
(and fix a compile warning).
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If /var/lib/nfs/sm is owned by non-root, setuid to that uid
after opening sockets but before receiving answers.
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As "mount.nfs" can start statd, and as statd can start sm-notify,
the risk of sm-notify being run multiple times increases.
As this is not normally appropriate, sm-notify now creates a
file in /var/run which will stop future instances from being
run (though ofcourse this behaviour can be controlled by a
new command line option).
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This functionality is alreday present in getaddrinfo so it isn't
needed explicitly.
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for compat with statd.
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Not included in build yet.
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