nfs-utils: don't use signals to shut down nfs server.

Since Linux v2.4 it has been possible to stop all NFS server by running

   rpc.nfsd 0

i.e.  by requesting that zero threads be running.  This is preferred as
it doesn't risk killing some other process which happens to be called
"nfsd".

Since Linux v6.6 - and other stable kernels to which

  Commit: 390390240145 ("nfsd: don't allow nfsd threads to be
  signalled.")

has been backported - sending a signal no longer works to stop nfs server
threads.

This patch changes the nfsserver script to use "rpc.nfsd 0" to stop
server threads.

(From OE-Core rev: b530827b938bcae33da08b65bab96d2549056f2e)

Signed-off-by: NeilBrown <neil@brown.name>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 7b09ad289a36)
Signed-off-by: Haixiao Yan <haixiao.yan.cn@windriver.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>

1 files changed, 4 insertions, 24 deletions

diff --git a/meta/recipes-connectivity/nfs-utils/nfs-utils/nfsserver b/meta/recipes-connectivity/nfs-utils/nfs-utils/nfsserver
index cb6c1b4d08..99ec280b35 100644
--- a/meta/recipes-connectivity/nfs-utils/nfs-utils/nfsserver
+++ b/meta/recipes-connectivity/nfs-utils/nfs-utils/nfsserver
@@ -89,34 +89,14 @@ start_nfsd(){
         start-stop-daemon --start --exec "$NFS_NFSD" -- "$@"
         echo done
 }
-delay_nfsd(){
-        for delay in 0 1 2 3 4 5 6 7 8 9 
-        do
-                if pidof nfsd >/dev/null
-                then
-                        echo -n .
-                        sleep 1
-                else
-                        return 0
-                fi
-        done
-        return 1
-}
 stop_nfsd(){
-        # WARNING: this kills any process with the executable
-        # name 'nfsd'.
         echo -n 'stopping nfsd: '
-        start-stop-daemon --stop --quiet --signal 1 --name nfsd
-        if delay_nfsd || {
-                echo failed
-                echo ' using signal 9: '
-                start-stop-daemon --stop --quiet --signal 9 --name nfsd
-                delay_nfsd
-        }
+        $NFS_NFSD 0
+        if pidof nfsd
         then
-                echo done
-        else
                 echo failed
+        else
+                echo done
         fi
 }