diff -up nfs-utils-2.3.3/configure.ac.orig nfs-utils-2.3.3/configure.ac

--- nfs-utils-2.3.3/configure.ac.orig	2020-06-09 10:58:50.178258035 -0400

+++ nfs-utils-2.3.3/configure.ac	2020-06-09 11:02:04.203102954 -0400

@@ -639,6 +639,7 @@ AC_CONFIG_FILES([

 	tools/rpcgen/Makefile

 	tools/mountstats/Makefile

 	tools/nfs-iostat/Makefile

+	tools/nfsdclnts/Makefile

 	tools/nfsconf/Makefile

 	tools/nfsdclddb/Makefile

 	utils/Makefile

diff -up nfs-utils-2.3.3/tools/Makefile.am.orig nfs-utils-2.3.3/tools/Makefile.am

--- nfs-utils-2.3.3/tools/Makefile.am.orig	2020-06-09 10:58:50.178258035 -0400

+++ nfs-utils-2.3.3/tools/Makefile.am	2020-06-09 11:02:04.203102954 -0400

@@ -12,6 +12,6 @@ if CONFIG_NFSDCLD

 OPTDIRS += nfsdclddb

 endif

-SUBDIRS = locktest rpcdebug nlmtest mountstats nfs-iostat $(OPTDIRS)

+SUBDIRS = locktest rpcdebug nlmtest mountstats nfs-iostat nfsdclnts $(OPTDIRS)

 MAINTAINERCLEANFILES = Makefile.in

diff -up nfs-utils-2.3.3/tools/nfsdclnts/Makefile.am.orig nfs-utils-2.3.3/tools/nfsdclnts/Makefile.am

--- nfs-utils-2.3.3/tools/nfsdclnts/Makefile.am.orig	2020-06-09 11:02:04.203102954 -0400

+++ nfs-utils-2.3.3/tools/nfsdclnts/Makefile.am	2020-06-09 11:02:04.203102954 -0400

@@ -0,0 +1,13 @@

+## Process this file with automake to produce Makefile.in

+PYTHON_FILES = nfsdclnts.py

+

+man8_MANS       = nfsdclnts.man

+

+EXTRA_DIST      = $(man8_MANS) $(PYTHON_FILES)

+

+all-local: $(PYTHON_FILES)

+

+install-data-hook:

+	$(INSTALL) -m 755 nfsdclnts.py $(DESTDIR)$(sbindir)/nfsdclnts

+

+MAINTAINERCLEANFILES=Makefile.in

diff -up nfs-utils-2.3.3/tools/nfsdclnts/nfsdclnts.man.orig nfs-utils-2.3.3/tools/nfsdclnts/nfsdclnts.man

--- nfs-utils-2.3.3/tools/nfsdclnts/nfsdclnts.man.orig	2020-06-09 11:02:04.203102954 -0400

+++ nfs-utils-2.3.3/tools/nfsdclnts/nfsdclnts.man	2020-06-09 11:02:04.203102954 -0400

@@ -0,0 +1,180 @@

+.\"

+.\" nfsdclnts(8)

+.\"

+.TH "NFSDCLTS" "8" "2020-05-09" "nfsdclnts" "nfsdclnts"

+.ie \n(.g .ds Aq \(aq

+.el       .ds Aq '

+.ss \n[.ss] 0

+.nh

+.ad l

+.de URL

+\fI\\$2\fP <\\$1>\\$3

+..

+.als MTO URL

+.if \n[.g] \{\

+.  mso www.tmac

+.  am URL

+.    ad l

+.  .

+.  am MTO

+.    ad l

+.  .

+.  LINKSTYLE blue R < >

+.\}

+.SH "NAME"

+nfsdclnts \- print various nfs client information for knfsd server.

+.SH "SYNOPSIS"

+.sp

+\fBnfsdclnts\fP [\fI\-h\fP] [\fI\-t type\fP] [\fI\-\-clientinfo\fP] [\fI\-\-hostname\fP] [\fI\-q\fP]

+.SH "DESCRIPTION"

+.sp

+The nfsdclnts(8) command parses the content present in /proc/fs/nfsd/clients/ directories. nfsdclnts(8) displays files which are open, locked, delegated by the nfs\-client. It also prints useful client information such as hostname, clientID, NFS version mounted by the nfs\-client.

+.SH "OPTIONS"

+.sp

+\fB\-t, \-\-type\fP=TYPE

+.RS 4

+Specify the type of file to be displayed. Takes only one TYPE at a time.

+.sp

+\fIopen\fP, \fIlock\fP, \fIdeleg\fP, \fIlayout\fP, or \fIall\fP

+.sp

+open: displays the open files by nfs\-client(s).

+.sp

+lock: displays the files locked by nfs\-client(s).

+.sp

+layout: displays the files for which layout is given.

+.sp

+deleg: displays delegated files information and delegation type.

+.sp

+all: prints all the above type.

+.RE

+.sp

+\fB\-\-clientinfo\fP

+.RS 4

+displays various nfs\-client info fields such as version of nfs mounted at nfs\-client and clientID.

+.RE

+.sp

+\fB\-\-hostname\fP

+.RS 4

+Print hostname of nfs\-client instead of ip-address.

+.RE

+.sp

+\fB\-q, \-\-quiet\fP

+.RS 4

+Hide the header information.

+.RE

+.sp

+\fB\-v, \-\-verbose\fP

+.RS 4

+Verbose operation, show debug messages.

+.RE

+.sp

+\fB\-f, \-\-file\fP

+.RS 4

+Instead of processing all client directories under /proc/fs/nfsd/clients, one can provide a specific

+states file to process. One should make sure that info file resides in the same directory as states file.

+If the info file is not valid or present the fields would be marked as "N/A".

+.RE

+.sp

+\fB\-h, \-\-help\fP

+.RS 4

+Print help explaining the command line options.

+.SH "EXAMPLES"

+.sp

+\fBnfsdclnts \-\-type open\fP

+.RS 4

+List all files with open type only.

+.RE

+.sp

+.if n .RS 4

+.nf

+Inode number | Type   | Access | Deny | ip address            | Filename

+33823232     | open   | r\-     | \-\-   | [::1]:757             | testfile

+.fi

+.if n .RE

+.sp

+\fBnfsdclnts \-\-type deleg\fP

+.RS 4

+List all files with deleg type only.

+.RE

+.sp

+.if n .RS 4

+.nf

+Inode number | Type   | Access | ip address            | Filename

+33823232     | deleg  | r      | [::1]:757             | testfile

+.fi

+.if n .RE

+.sp

+\fBnfsdclnts \-\-hostname\fP

+.RS 4

+Print hostname instead of ip\-address.

+.RE

+.sp

+.if n .RS 4

+.nf

+Inode number | Type   | Access | Deny | Hostname              | Filename

+33823232     | open   | r\-     | \-\-   | nfs\-server            | testfile

+33823232     | deleg  | r      |      | nfs\-server            | testfile

+.fi

+.if n .RE

+.sp

+\fBnfsdclnts \-\-clientinfo\fP

+.RS 4

+Print client information.

+.RE

+.sp

+.if n .RS 4

+.nf

+Inode number | Type   | Access | Deny | ip address            | Client ID           | vers | Filename

+33823232     | open   | r\-     | \-\-   | [::1]:757             | 0xc79a009f5eb65e84  | 4.2  | testfile

+33823232     | deleg  | r      |      | [::1]:757             | 0xc79a009f5eb65e84  | 4.2  | testfile

+.fi

+.if n .RE

+.sp

+\fBnfsdclnts \-\-file /proc/fs/nfsd/clients/3/states -t open\fP

+.RS 4

+Process specific states file.

+.RE

+.sp

+.if n .RS 4

+.nf

+Inode number | Type   | Access | Deny | ip address            | Client ID           | vers | Filename

+33823232     | open   | r\-     | \-\-   | [::1]:757             | 0xc79a009f5eb65e84  | 4.2  | testfile

+.fi

+.if n .RE

+.sp

+\fBnfsdclnts \-\-quiet \-\-hostname\fP

+.RS 4

+Hide the header information.

+.RE

+.sp

+.if n .RS 4

+.nf

+33823232     | open   | r\-     | \-\-   | nfs\-server            | testfile

+33823232     | deleg  | r      |      | nfs\-server            | testfile

+.fi

+.if n .RE

+.SH "FILES"

+.sp

+\fB/proc/fs/nfsd/clients/\fP

+.sp

+Displays basic information about each NFSv4 client.

+.sp

+\fB/proc/fs/nfsd/clients/#/info\fP

+.sp

+Displays information about all the opens held by the given client, including open modes, device numbers, inode numbers, and open owners.

+.sp

+\fB/proc/fs/nfsd/clients/#/states\fP

+.SH "NOTES"

+.sp

+/proc/fs/nfsd/clients/ support was initially introduced in 5.3 kernel and is only implemented for mount points using NFSv4.

+.SH "BUGS"

+Please report any BUGs to \c

+.MTO "linux\-nfs\(atvger.kernel.org" "" ""

+.SH SEE ALSO

+.BR nfsd (8),

+.BR exportfs (8),

+.BR idmapd (8),

+.BR statd (8)

+.SH "AUTHORS"

+Achilles Gaikwad <agaikwad@redhat.com> and

+Kenneth D'souza  <kdsouza@redhat.com>

diff -up nfs-utils-2.3.3/tools/nfsdclnts/nfsdclnts.py.orig nfs-utils-2.3.3/tools/nfsdclnts/nfsdclnts.py

--- nfs-utils-2.3.3/tools/nfsdclnts/nfsdclnts.py.orig	2020-06-09 11:02:04.203102954 -0400

+++ nfs-utils-2.3.3/tools/nfsdclnts/nfsdclnts.py	2020-06-09 11:02:04.203102954 -0400

@@ -0,0 +1,254 @@

+#!/usr/bin/python3

+# -*- python-mode -*-

+'''

+    Copyright (C) 2020

+    Authors:    Achilles Gaikwad <agaikwad@redhat.com>

+                Kenneth  D'souza <kdsouza@redhat.com>

+

+    This program is free software: you can redistribute it and/or modify

+    it under the terms of the GNU General Public License as published by

+    the Free Software Foundation, either version 3 of the License, or

+    (at your option) any later version.

+

+    This program is distributed in the hope that it will be useful,

+    but WITHOUT ANY WARRANTY; without even the implied warranty of

+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

+    GNU General Public License for more details.

+

+    You should have received a copy of the GNU General Public License

+    along with this program.  If not, see <https://www.gnu.org/licenses/>.

+'''

+

+import multiprocessing as mp

+import os

+import signal

+import sys

+

+try:

+    import argparse

+except ImportError:

+    print('%s:  Failed to import argparse - make sure argparse is installed!'

+        % sys.argv[0])

+    sys.exit(1)

+try:

+    import yaml

+except ImportError:

+    print('%s:  Failed to import yaml - make sure python3-pyyaml is installed!'

+        % sys.argv[0])

+    sys.exit(1)

+

+BBOLD = '\033[1;30;47m' #Bold black text with white background.

+ENDC = '\033[m' #Rest to defaults

+

+def init_worker():

+    signal.signal(signal.SIGINT, signal.SIG_IGN)

+

+# this function converts the info file to a dictionary format, sorta. 

+def file_to_dict(path):

+    client_info = {}

+    try:

+        with open(path) as f:

+            for line in f:

+                try:

+                    (key, val) = line.split(':', 1)

+                    client_info[key] = val.strip()

+                    # FIXME: There has to be a better way of converting the info file to a dictionary.

+                except ValueError as reason:

+                    if verbose:

+                        print('Exception occured, %s' % reason)

+

+        if len(client_info) == 0 and verbose:

+            print("Provided %s file is not valid" %path)

+        return client_info

+

+    except OSError as reason:

+        if verbose:

+            print('%s' % reason)

+

+# this function gets the paths from /proc/fs/nfsd/clients/

+# returns a list of paths for each client which has nfs-share mounted.

+def getpaths():

+    path = []

+    try:

+        dirs = os.listdir('/proc/fs/nfsd/clients/')

+    except OSError as reason:

+        exit('%s' % reason)

+    if len(dirs) !=0:

+	    for i in dirs:

+                path.append('/proc/fs/nfsd/clients/' + i + '/states')

+	    return (path)

+    else:

+        exit('Nothing to process')

+

+# A single function to rule them all, in this function we gather all the data

+# from already populated data_list and client_info.

+def printer(data_list, argument):

+    client_info_path = data_list.pop()

+    client_info = file_to_dict(client_info_path)

+    for i in data_list:

+        for key in i:

+            inode = i[key]['superblock'].split(':')[-1]

+            # The ip address is quoted, so we dequote it.

+            try:

+                client_ip = client_info['address'][1:-1]

+            except:

+                client_ip = "N/A"

+            try:

+                # if the nfs-server reboots while the nfs-client holds the files open,

+                # the nfs-server would print the filename as '/'. For such instaces we

+                # print the output as disconnected dentry instead of '/'.

+                if(i[key]['filename']=='/'):

+                    fname = 'disconnected dentry'

+                else:

+                    fname = i[key]['filename'].split('/')[-1]

+            except KeyError:

+                # for older kernels which do not have the fname patch in kernel, they

+                # won't be able to see the fname field. Therefore post it as N/A.

+                fname = "N/A"

+            otype = i[key]['type']

+            try:

+                access = i[key]['access']

+            except:

+                access = ''

+            try:

+                deny = i[key]['deny']

+            except:

+                deny = ''

+            try:

+                hostname = client_info['name'].split()[-1].split('"')[0]

+                hostname =  hostname.split('.')[0]

+                # if the hostname is too long, it messes up with the output being in columns,

+                # therefore we truncate the hostname followed by two '..' as suffix.

+                if len(hostname) > 20:

+                    hostname = hostname[0:20] + '..'

+            except:

+                hostname = "N/A"

+            try:

+                clientid = client_info['clientid']

+            except:

+                clientid = "N/A"

+            try:

+                minorversion = "4." + client_info['minor version']

+            except:

+                minorversion = "N/A"

+

+            otype = i[key]['type']

+            # since some fields do not have deny column, we drop those if -t is either

+            # layout or lock.

+            drop = ['layout', 'lock']

+

+            # Printing the output this way instead of a single string which is concatenated

+            # this makes it better to quickly add more columns in future.

+            if(otype == argument.type or  argument.type == 'all'):

+                print('%-13s' %inode, end='| ')

+                print('%-7s' %otype, end='| ')

+                if (argument.type not in drop):

+                    print('%-7s' %access, end='| ')

+                if (argument.type not in drop and argument.type !='deleg'):

+                    print('%-5s' %deny, end='| ')

+                if (argument.hostname == True):

+                    print('%-22s' %hostname, end='| ')

+                else:

+                   print('%-22s' %client_ip, end='| ')

+                if (argument.clientinfo == True) :

+                    print('%-20s' %clientid, end='| ')

+                    print('%-5s' %minorversion, end='| ')

+                print(fname)

+

+def opener(path):

+    try:

+        with open(path, 'r') as nfsdata:

+            try:

+                data = yaml.load(nfsdata, Loader = yaml.BaseLoader)

+                if data is not None:

+                    clientinfo = path.rsplit('/', 1)[0] + '/info'

+                    data.append(clientinfo)

+                return data

+            except:

+                if verbose:

+                    print("Exception occurred, Please make sure %s is a YAML file" %path)

+

+    except OSError as reason:

+        if verbose:

+            print('%s' % reason)

+

+def print_cols(argument):

+    title_inode = 'Inode number'

+    title_otype = 'Type'

+    title_access = 'Access'

+    title_deny = 'Deny'

+    title_fname = 'Filename'

+    title_clientID = 'Client ID'

+    title_hostname = 'Hostname'

+    title_ip = 'ip address'

+    title_nfsvers = 'vers'

+

+    drop = ['lock', 'layout']

+    print(BBOLD, end='')

+    print('%-13s' %title_inode, end='| ')

+    print('%-7s' %title_otype, end='| ')

+    if (argument.type not in drop):

+        print('%-7s' %title_access, end='| ')

+    if (argument.type not in drop and argument.type !='deleg'):

+        print('%-5s' %title_deny, end='| ')

+    if (argument.hostname == True):

+        print('%-22s' %title_hostname, end='| ')

+    else:

+        print('%-22s' %title_ip, end='| ')

+    if (argument.clientinfo == True):

+        print('%-20s' %title_clientID, end='| ')

+        print('%-5s' %title_nfsvers, end='| ')

+    print(title_fname, end='')

+    print(ENDC)

+

+def nfsd4_show():

+

+    parser = argparse.ArgumentParser(description = 'Parse the nfsd states and clientinfo files.')

+    parser.add_argument('-t', '--type', metavar = 'type', type = str, choices = ['open',

+        'deleg', 'lock', 'layout', 'all'],

+        default = 'all',

+        help = 'Input the type that you want to be printed: open, lock, deleg, layout, all')

+    parser.add_argument('--clientinfo', action = 'store_true',

+        help = 'output clients information, --hostname is implied.')

+    parser.add_argument('--hostname', action = 'store_true',

+        help = 'print hostname of client instead of its ip address. Longer hostnames are truncated.')

+    parser.add_argument('-v', '--verbose', action = 'store_true',

+        help = 'Verbose operation, show debug messages.')

+    parser.add_argument('-f', '--file', nargs='+', type = str, metavar='',

+        help = 'pass client states file, provided that info file resides in the same directory.')

+    parser.add_argument('-q', '--quiet', action = 'store_true',

+        help = 'don\'t print the header information')

+

+    args = parser.parse_args()

+

+    global verbose

+    verbose = False

+    if args.verbose:

+        verbose = True

+

+    if args.file:

+        paths = args.file

+    else:

+        paths = getpaths()

+

+    p = mp.Pool(mp.cpu_count(), init_worker)

+    try:

+        result = p.map(opener, paths)

+        ### Drop None entries from list

+        final_result = list(filter(None, result))

+        p.close()

+        p.join()

+

+        if len(final_result) !=0 and not args.quiet:

+            print_cols(args)

+

+        for item in final_result:

+            printer(item, args)

+

+    except KeyboardInterrupt:

+        print('Caught KeyboardInterrupt, terminating workers')

+        p.terminate()

+        p.join()

+

+if __name__ == "__main__":

+    nfsd4_show()