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e96c122790
SC2039: In POSIX sh, -nt is not supported. This script is specific to the Linux NFS implementation. The -nt operator is well supported in Linux shells (e.g. dash, bash, ksh). The alternatives (e.g. using stat(1)) would result in less readable code. Signed-off-by: Martin Schwenke <martin@meltin.net> Reviewed-by: Amitay Isaacs <amitay@gmail.com>
254 lines
5.3 KiB
Bash
Executable File
254 lines
5.3 KiB
Bash
Executable File
#!/bin/sh
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# Exit on 1st error
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set -e
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# NFS exports file. Some code below keeps a cache of output derived
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# from exportfs(8). When this file is updated the cache is invalid
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# and needs to be regenerated.
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#
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# To change the file, edit the default value below. Do not set
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# CTDB_NFS_EXPORTS_FILE - it isn't a configuration variable, just a
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# hook for testing.
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nfs_exports_file="${CTDB_NFS_EXPORTS_FILE:-/var/lib/nfs/etab}"
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# Red Hat
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nfs_service="nfs"
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nfslock_service="nfslock"
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nfs_config="/etc/sysconfig/nfs"
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# SUSE
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#nfs_service="nfsserver"
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#nfslock_service=""
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#nfs_config="/etc/sysconfig/nfs"
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# Debian
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#nfs_service="nfs-kernel-server"
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#nfslock_service=""
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#nfs_config="/etc/default/nfs-kernel-server"
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# Override for unit testing
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if [ -z "$PROCFS_PATH" ] ; then
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PROCFS_PATH="/proc"
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fi
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##################################################
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usage ()
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{
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_c=$(basename "$0")
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cat <<EOF
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usage: $_c { shutdown | startup }
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$_c { stop | start } { nfs | nlockmgr }
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$_c { monitor-list-shares | monitor-post }
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$_c { register }
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EOF
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exit 1
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}
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##################################################
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# Basic service stop and start
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basic_stop ()
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{
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case "$1" in
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nfs)
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service "$nfs_service" stop
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if [ -n "$nfslock_service" ] ; then
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service "$nfslock_service" stop
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fi
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;;
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nfslock)
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if [ -n "$nfslock_service" ] ; then
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service "$nfslock_service" stop
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else
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service "$nfs_service" stop
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fi
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;;
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*)
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usage
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esac
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}
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basic_start ()
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{
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case "$1" in
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nfs)
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if [ -n "$nfslock_service" ] ; then
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service "$nfslock_service" start
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fi
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service "$nfs_service" start
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;;
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nfslock)
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if [ -n "$nfslock_service" ] ; then
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service "$nfslock_service" start
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else
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service "$nfs_service" start
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fi
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;;
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*)
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usage
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esac
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}
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##################################################
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# service "stop" and "start" options for restarting
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service_stop ()
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{
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case "$1" in
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nfs)
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echo 0 >"${PROCFS_PATH}/fs/nfsd/threads"
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basic_stop "nfs" >/dev/null 2>&1 || true
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pkill -9 nfsd
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;;
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nlockmgr)
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basic_stop "nfslock" >/dev/null 2>&1 || true
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;;
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*)
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usage
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esac
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}
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service_start ()
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{
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case "$1" in
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nfs)
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basic_start "nfs"
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;;
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nlockmgr)
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basic_start "nfslock"
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;;
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*)
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usage
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esac
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}
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##################################################
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# service init startup and final shutdown
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nfs_shutdown ()
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{
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basic_stop "nfs"
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}
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nfs_startup ()
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{
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basic_stop "nfs" || true
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basic_start "nfs"
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_f="${PROCFS_PATH}/sys/net/ipv4/tcp_tw_recycle"
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if [ "$_f" ] ; then
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echo 1 >"$_f"
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fi
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}
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##################################################
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# monitor-post support
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nfs_check_thread_count ()
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{
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# Load NFS configuration to get desired number of threads.
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if [ -r "$nfs_config" ] ; then
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. "$nfs_config"
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fi
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# If $RPCNFSDCOUNT/$USE_KERNEL_NFSD_NUMBER isn't set then we could
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# guess the default from the initscript. However, let's just
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# assume that those using the default don't care about the number
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# of threads and that they have switched on this feature in error.
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_configured_threads="${RPCNFSDCOUNT:-${USE_KERNEL_NFSD_NUMBER}}"
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[ -n "$_configured_threads" ] || return 0
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_threads_file="${PROCFS_PATH}/fs/nfsd/threads"
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# nfsd should be running the configured number of threads. If
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# there are a different number of threads then tell nfsd the
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# correct number.
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read _running_threads <"$_threads_file" || {
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echo "WARNING: Reading \"${_threads_file}\" unexpectedly failed"
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exit 0
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}
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# Intentionally not arithmetic comparison - avoids extra errors
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# when above read fails in an unexpected way...
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if [ "$_running_threads" != "$_configured_threads" ] ; then
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echo "Attempting to correct number of nfsd threads from ${_running_threads} to ${_configured_threads}"
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echo "$_configured_threads" >"$_threads_file"
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fi
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}
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##################################################
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# list share directories
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nfs_monitor_list_shares ()
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{
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_cache_file="${CTDB_NFS_CALLOUT_STATE_DIR}/list_shares_cache"
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# -nt operator is well supported in Linux: dash, bash, ksh, ...
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# shellcheck disable=SC2039
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if [ ! -r "$nfs_exports_file" ] || [ ! -r "$_cache_file" ] || \
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[ "$nfs_exports_file" -nt "$_cache_file" ] ; then
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mkdir -p "$CTDB_NFS_CALLOUT_STATE_DIR"
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# We could just use the contents of $nfs_exports_file.
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# However, let's regard that file as internal to NFS and use
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# exportfs, which is the public API.
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if ! _exports=$(exportfs -v) ; then
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echo "WARNING: failed to run exportfs to list NFS shares" >&2
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return
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fi
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echo "$_exports" |
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grep '^/' |
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sed -e 's@[[:space:]][[:space:]]*[^[:space:]()][^[:space:]()]*([^[:space:]()][^[:space:]()]*)$@@' |
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sort -u >"$_cache_file"
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fi
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cat "$_cache_file"
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}
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##################################################
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nfs_register ()
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{
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cat <<EOF
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shutdown
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startup
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stop
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start
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monitor-list-shares
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monitor-post
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EOF
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}
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##################################################
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case "$1" in
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shutdown)
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nfs_shutdown
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;;
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startup)
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nfs_startup
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;;
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stop)
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service_stop "$2"
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;;
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start)
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service_start "$2"
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;;
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monitor-list-shares)
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nfs_monitor_list_shares
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;;
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monitor-post)
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nfs_check_thread_count
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;;
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register)
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nfs_register
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;;
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monitor-pre|releaseip|takeip|releaseip-pre|takeip-pre)
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# Not required/implemented
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:
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;;
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*)
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usage
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esac
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