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	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * Syscall interface to knfsd.
  *
  * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
  */
 
 #include <linux/slab.h>
 #include <linux/namei.h>
 #include <linux/ctype.h>
 #include <linux/fs_context.h>
 
 #include <linux/sunrpc/svcsock.h>
 #include <linux/lockd/lockd.h>
 #include <linux/sunrpc/addr.h>
 #include <linux/sunrpc/gss_api.h>
 #include <linux/sunrpc/gss_krb5_enctypes.h>
 #include <linux/sunrpc/rpc_pipe_fs.h>
 #include <linux/module.h>
 #include <linux/fsnotify.h>
 
 #include "idmap.h"
 #include "nfsd.h"
 #include "cache.h"
 #include "state.h"
 #include "netns.h"
 #include "pnfs.h"
 #include "filecache.h"
 
 /*
  *  We have a single directory with several nodes in it.
  */
 enum {
     NFSD_Root = 1,
     NFSD_List,
     NFSD_Export_Stats,
     NFSD_Export_features,
     NFSD_Fh,
     NFSD_FO_UnlockIP,
     NFSD_FO_UnlockFS,
     NFSD_Threads,
     NFSD_Pool_Threads,
     NFSD_Pool_Stats,
     NFSD_Reply_Cache_Stats,
     NFSD_Versions,
     NFSD_Ports,
     NFSD_MaxBlkSize,
     NFSD_MaxConnections,
     NFSD_Filecache,
     NFSD_SupportedEnctypes,
     /*
      * The below MUST come last.  Otherwise we leave a hole in nfsd_files[]
      * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
      */
 #ifdef CONFIG_NFSD_V4
     NFSD_Leasetime,
     NFSD_Gracetime,
     NFSD_RecoveryDir,
     NFSD_V4EndGrace,
 #endif
     NFSD_MaxReserved
 };
 
 /*
  * write() for these nodes.
  */
 static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size);
 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size);
 static ssize_t write_threads(struct file *file, char *buf, size_t size);
 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
 static ssize_t write_versions(struct file *file, char *buf, size_t size);
 static ssize_t write_ports(struct file *file, char *buf, size_t size);
 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
 static ssize_t write_maxconn(struct file *file, char *buf, size_t size);
 #ifdef CONFIG_NFSD_V4
 static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
 static ssize_t write_gracetime(struct file *file, char *buf, size_t size);
 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
 static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size);
 #endif
 
 static ssize_t (*const write_op[])(struct file *, char *, size_t) = {
     [NFSD_Fh] = write_filehandle,
     [NFSD_FO_UnlockIP] = write_unlock_ip,
     [NFSD_FO_UnlockFS] = write_unlock_fs,
     [NFSD_Threads] = write_threads,
     [NFSD_Pool_Threads] = write_pool_threads,
     [NFSD_Versions] = write_versions,
     [NFSD_Ports] = write_ports,
     [NFSD_MaxBlkSize] = write_maxblksize,
     [NFSD_MaxConnections] = write_maxconn,
 #ifdef CONFIG_NFSD_V4
     [NFSD_Leasetime] = write_leasetime,
     [NFSD_Gracetime] = write_gracetime,
     [NFSD_RecoveryDir] = write_recoverydir,
     [NFSD_V4EndGrace] = write_v4_end_grace,
 #endif
 };
 
 static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
 {
     ino_t ino =  file_inode(file)->i_ino;
     char *data;
     ssize_t rv;
 
     if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
         return -EINVAL;
 
     data = simple_transaction_get(file, buf, size);
     if (IS_ERR(data))
         return PTR_ERR(data);
 
     rv =  write_op[ino](file, data, size);
     if (rv >= 0) {
         simple_transaction_set(file, rv);
         rv = size;
     }
     return rv;
 }
 
 static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
 {
     if (! file->private_data) {
         /* An attempt to read a transaction file without writing
          * causes a 0-byte write so that the file can return
          * state information
          */
         ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
         if (rv < 0)
             return rv;
     }
     return simple_transaction_read(file, buf, size, pos);
 }
 
 static const struct file_operations transaction_ops = {
     .write      = nfsctl_transaction_write,
     .read       = nfsctl_transaction_read,
     .release    = simple_transaction_release,
     .llseek     = default_llseek,
 };
 
 static int exports_net_open(struct net *net, struct file *file)
 {
     int err;
     struct seq_file *seq;
     struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 
     err = seq_open(file, &nfs_exports_op);
     if (err)
         return err;
 
     seq = file->private_data;
     seq->private = nn->svc_export_cache;
     return 0;
 }
 
 static int exports_proc_open(struct inode *inode, struct file *file)
 {
     return exports_net_open(current->nsproxy->net_ns, file);
 }
 
 static const struct proc_ops exports_proc_ops = {
     .proc_open  = exports_proc_open,
     .proc_read  = seq_read,
     .proc_lseek = seq_lseek,
     .proc_release   = seq_release,
 };
 
 static int exports_nfsd_open(struct inode *inode, struct file *file)
 {
     return exports_net_open(inode->i_sb->s_fs_info, file);
 }
 
 static const struct file_operations exports_nfsd_operations = {
     .open       = exports_nfsd_open,
     .read       = seq_read,
     .llseek     = seq_lseek,
     .release    = seq_release,
 };
 
 static int export_features_show(struct seq_file *m, void *v)
 {
     seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS);
     return 0;
 }
 
 static int export_features_open(struct inode *inode, struct file *file)
 {
     return single_open(file, export_features_show, NULL);
 }
 
 static const struct file_operations export_features_operations = {
     .open       = export_features_open,
     .read       = seq_read,
     .llseek     = seq_lseek,
     .release    = single_release,
 };
 
 #if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
 static int supported_enctypes_show(struct seq_file *m, void *v)
 {
     seq_printf(m, KRB5_SUPPORTED_ENCTYPES);
     return 0;
 }
 
 static int supported_enctypes_open(struct inode *inode, struct file *file)
 {
     return single_open(file, supported_enctypes_show, NULL);
 }
 
 static const struct file_operations supported_enctypes_ops = {
     .open       = supported_enctypes_open,
     .read       = seq_read,
     .llseek     = seq_lseek,
     .release    = single_release,
 };
 #endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
 
 static const struct file_operations pool_stats_operations = {
     .open       = nfsd_pool_stats_open,
     .read       = seq_read,
     .llseek     = seq_lseek,
     .release    = nfsd_pool_stats_release,
 };
 
 static const struct file_operations reply_cache_stats_operations = {
     .open       = nfsd_reply_cache_stats_open,
     .read       = seq_read,
     .llseek     = seq_lseek,
     .release    = single_release,
 };
 
 static const struct file_operations filecache_ops = {
     .open       = nfsd_file_cache_stats_open,
     .read       = seq_read,
     .llseek     = seq_lseek,
     .release    = single_release,
 };
 
 /*----------------------------------------------------------------------------*/
 /*
  * payload - write methods
  */
 
 static inline struct net *netns(struct file *file)
 {
     return file_inode(file)->i_sb->s_fs_info;
 }
 
 /*
  * write_unlock_ip - Release all locks used by a client
  *
  * Experimental.
  *
  * Input:
  *          buf:    '\n'-terminated C string containing a
  *              presentation format IP address
  *          size:   length of C string in @buf
  * Output:
  *  On success: returns zero if all specified locks were released;
  *          returns one if one or more locks were not released
  *  On error:   return code is negative errno value
  */
 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
 {
     struct sockaddr_storage address;
     struct sockaddr *sap = (struct sockaddr *)&address;
     size_t salen = sizeof(address);
     char *fo_path;
     struct net *net = netns(file);
 
     /* sanity check */
     if (size == 0)
         return -EINVAL;
 
     if (buf[size-1] != '\n')
         return -EINVAL;
 
     fo_path = buf;
     if (qword_get(&buf, fo_path, size) < 0)
         return -EINVAL;
 
     if (rpc_pton(net, fo_path, size, sap, salen) == 0)
         return -EINVAL;
 
     return nlmsvc_unlock_all_by_ip(sap);
 }
 
 /*
  * write_unlock_fs - Release all locks on a local file system
  *
  * Experimental.
  *
  * Input:
  *          buf:    '\n'-terminated C string containing the
  *              absolute pathname of a local file system
  *          size:   length of C string in @buf
  * Output:
  *  On success: returns zero if all specified locks were released;
  *          returns one if one or more locks were not released
  *  On error:   return code is negative errno value
  */
 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
 {
     struct path path;
     char *fo_path;
     int error;
 
     /* sanity check */
     if (size == 0)
         return -EINVAL;
 
     if (buf[size-1] != '\n')
         return -EINVAL;
 
     fo_path = buf;
     if (qword_get(&buf, fo_path, size) < 0)
         return -EINVAL;
 
     error = kern_path(fo_path, 0, &path);
     if (error)
         return error;
 
     /*
      * XXX: Needs better sanity checking.  Otherwise we could end up
      * releasing locks on the wrong file system.
      *
      * For example:
      * 1.  Does the path refer to a directory?
      * 2.  Is that directory a mount point, or
      * 3.  Is that directory the root of an exported file system?
      */
     error = nlmsvc_unlock_all_by_sb(path.dentry->d_sb);
 
     path_put(&path);
     return error;
 }
 
 /*
  * write_filehandle - Get a variable-length NFS file handle by path
  *
  * On input, the buffer contains a '\n'-terminated C string comprised of
  * three alphanumeric words separated by whitespace.  The string may
  * contain escape sequences.
  *
  * Input:
  *          buf:
  *              domain:     client domain name
  *              path:       export pathname
  *              maxsize:    numeric maximum size of
  *                      @buf
  *          size:   length of C string in @buf
  * Output:
  *  On success: passed-in buffer filled with '\n'-terminated C
  *          string containing a ASCII hex text version
  *          of the NFS file handle;
  *          return code is the size in bytes of the string
  *  On error:   return code is negative errno value
  */
 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
 {
     char *dname, *path;
     int maxsize;
     char *mesg = buf;
     int len;
     struct auth_domain *dom;
     struct knfsd_fh fh;
 
     if (size == 0)
         return -EINVAL;
 
     if (buf[size-1] != '\n')
         return -EINVAL;
     buf[size-1] = 0;
 
     dname = mesg;
     len = qword_get(&mesg, dname, size);
     if (len <= 0)
         return -EINVAL;
     
     path = dname+len+1;
     len = qword_get(&mesg, path, size);
     if (len <= 0)
         return -EINVAL;
 
     len = get_int(&mesg, &maxsize);
     if (len)
         return len;
 
     if (maxsize < NFS_FHSIZE)
         return -EINVAL;
     maxsize = min(maxsize, NFS3_FHSIZE);
 
     if (qword_get(&mesg, mesg, size)>0)
         return -EINVAL;
 
     /* we have all the words, they are in buf.. */
     dom = unix_domain_find(dname);
     if (!dom)
         return -ENOMEM;
 
     len = exp_rootfh(netns(file), dom, path, &fh,  maxsize);
     auth_domain_put(dom);
     if (len)
         return len;
 
     mesg = buf;
     len = SIMPLE_TRANSACTION_LIMIT;
     qword_addhex(&mesg, &len, fh.fh_raw, fh.fh_size);
     mesg[-1] = '\n';
     return mesg - buf;
 }
 
 /*
  * write_threads - Start NFSD, or report the current number of running threads
  *
  * Input:
  *          buf:        ignored
  *          size:       zero
  * Output:
  *  On success: passed-in buffer filled with '\n'-terminated C
  *          string numeric value representing the number of
  *          running NFSD threads;
  *          return code is the size in bytes of the string
  *  On error:   return code is zero
  *
  * OR
  *
  * Input:
  *          buf:        C string containing an unsigned
  *                  integer value representing the
  *                  number of NFSD threads to start
  *          size:       non-zero length of C string in @buf
  * Output:
  *  On success: NFS service is started;
  *          passed-in buffer filled with '\n'-terminated C
  *          string numeric value representing the number of
  *          running NFSD threads;
  *          return code is the size in bytes of the string
  *  On error:   return code is zero or a negative errno value
  */
 static ssize_t write_threads(struct file *file, char *buf, size_t size)
 {
     char *mesg = buf;
     int rv;
     struct net *net = netns(file);
 
     if (size > 0) {
         int newthreads;
         rv = get_int(&mesg, &newthreads);
         if (rv)
             return rv;
         if (newthreads < 0)
             return -EINVAL;
         rv = nfsd_svc(newthreads, net, file->f_cred);
         if (rv < 0)
             return rv;
     } else
         rv = nfsd_nrthreads(net);
 
     return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
 }
 
 /*
  * write_pool_threads - Set or report the current number of threads per pool
  *
  * Input:
  *          buf:        ignored
  *          size:       zero
  *
  * OR
  *
  * Input:
  *          buf:        C string containing whitespace-
  *                  separated unsigned integer values
  *                  representing the number of NFSD
  *                  threads to start in each pool
  *          size:       non-zero length of C string in @buf
  * Output:
  *  On success: passed-in buffer filled with '\n'-terminated C
  *          string containing integer values representing the
  *          number of NFSD threads in each pool;
  *          return code is the size in bytes of the string
  *  On error:   return code is zero or a negative errno value
  */
 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
 {
     /* if size > 0, look for an array of number of threads per node
      * and apply them  then write out number of threads per node as reply
      */
     char *mesg = buf;
     int i;
     int rv;
     int len;
     int npools;
     int *nthreads;
     struct net *net = netns(file);
 
     mutex_lock(&nfsd_mutex);
     npools = nfsd_nrpools(net);
     if (npools == 0) {
         /*
          * NFS is shut down.  The admin can start it by
          * writing to the threads file but NOT the pool_threads
          * file, sorry.  Report zero threads.
          */
         mutex_unlock(&nfsd_mutex);
         strcpy(buf, "0\n");
         return strlen(buf);
     }
 
     nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
     rv = -ENOMEM;
     if (nthreads == NULL)
         goto out_free;
 
     if (size > 0) {
         for (i = 0; i < npools; i++) {
             rv = get_int(&mesg, &nthreads[i]);
             if (rv == -ENOENT)
                 break;      /* fewer numbers than pools */
             if (rv)
                 goto out_free;  /* syntax error */
             rv = -EINVAL;
             if (nthreads[i] < 0)
                 goto out_free;
         }
         rv = nfsd_set_nrthreads(i, nthreads, net);
         if (rv)
             goto out_free;
     }
 
     rv = nfsd_get_nrthreads(npools, nthreads, net);
     if (rv)
         goto out_free;
 
     mesg = buf;
     size = SIMPLE_TRANSACTION_LIMIT;
     for (i = 0; i < npools && size > 0; i++) {
         snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
         len = strlen(mesg);
         size -= len;
         mesg += len;
     }
     rv = mesg - buf;
 out_free:
     kfree(nthreads);
     mutex_unlock(&nfsd_mutex);
     return rv;
 }
 
 static ssize_t
 nfsd_print_version_support(struct nfsd_net *nn, char *buf, int remaining,
         const char *sep, unsigned vers, int minor)
 {
     const char *format = minor < 0 ? "%s%c%u" : "%s%c%u.%u";
     bool supported = !!nfsd_vers(nn, vers, NFSD_TEST);
 
     if (vers == 4 && minor >= 0 &&
         !nfsd_minorversion(nn, minor, NFSD_TEST))
         supported = false;
     if (minor == 0 && supported)
         /*
          * special case for backward compatability.
          * +4.0 is never reported, it is implied by
          * +4, unless -4.0 is present.
          */
         return 0;
     return snprintf(buf, remaining, format, sep,
             supported ? '+' : '-', vers, minor);
 }
 
 static ssize_t __write_versions(struct file *file, char *buf, size_t size)
 {
     char *mesg = buf;
     char *vers, *minorp, sign;
     int len, num, remaining;
     ssize_t tlen = 0;
     char *sep;
     struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
 
     if (size>0) {
         if (nn->nfsd_serv)
             /* Cannot change versions without updating
              * nn->nfsd_serv->sv_xdrsize, and reallocing
              * rq_argp and rq_resp
              */
             return -EBUSY;
         if (buf[size-1] != '\n')
             return -EINVAL;
         buf[size-1] = 0;
 
         vers = mesg;
         len = qword_get(&mesg, vers, size);
         if (len <= 0) return -EINVAL;
         do {
             enum vers_op cmd;
             unsigned minor;
             sign = *vers;
             if (sign == '+' || sign == '-')
                 num = simple_strtol((vers+1), &minorp, 0);
             else
                 num = simple_strtol(vers, &minorp, 0);
             if (*minorp == '.') {
                 if (num != 4)
                     return -EINVAL;
                 if (kstrtouint(minorp+1, 0, &minor) < 0)
                     return -EINVAL;
             }
 
             cmd = sign == '-' ? NFSD_CLEAR : NFSD_SET;
             switch(num) {
             case 2:
             case 3:
                 nfsd_vers(nn, num, cmd);
                 break;
             case 4:
                 if (*minorp == '.') {
                     if (nfsd_minorversion(nn, minor, cmd) < 0)
                         return -EINVAL;
                 } else if ((cmd == NFSD_SET) != nfsd_vers(nn, num, NFSD_TEST)) {
                     /*
                      * Either we have +4 and no minors are enabled,
                      * or we have -4 and at least one minor is enabled.
                      * In either case, propagate 'cmd' to all minors.
                      */
                     minor = 0;
                     while (nfsd_minorversion(nn, minor, cmd) >= 0)
                         minor++;
                 }
                 break;
             default:
                 return -EINVAL;
             }
             vers += len + 1;
         } while ((len = qword_get(&mesg, vers, size)) > 0);
         /* If all get turned off, turn them back on, as
          * having no versions is BAD
          */
         nfsd_reset_versions(nn);
     }
 
     /* Now write current state into reply buffer */
     sep = "";
     remaining = SIMPLE_TRANSACTION_LIMIT;
     for (num=2 ; num <= 4 ; num++) {
         int minor;
         if (!nfsd_vers(nn, num, NFSD_AVAIL))
             continue;
 
         minor = -1;
         do {
             len = nfsd_print_version_support(nn, buf, remaining,
                     sep, num, minor);
             if (len >= remaining)
                 goto out;
             remaining -= len;
             buf += len;
             tlen += len;
             minor++;
             if (len)
                 sep = " ";
         } while (num == 4 && minor <= NFSD_SUPPORTED_MINOR_VERSION);
     }
 out:
     len = snprintf(buf, remaining, "\n");
     if (len >= remaining)
         return -EINVAL;
     return tlen + len;
 }
 
 /*
  * write_versions - Set or report the available NFS protocol versions
  *
  * Input:
  *          buf:        ignored
  *          size:       zero
  * Output:
  *  On success: passed-in buffer filled with '\n'-terminated C
  *          string containing positive or negative integer
  *          values representing the current status of each
  *          protocol version;
  *          return code is the size in bytes of the string
  *  On error:   return code is zero or a negative errno value
  *
  * OR
  *
  * Input:
  *          buf:        C string containing whitespace-
  *                  separated positive or negative
  *                  integer values representing NFS
  *                  protocol versions to enable ("+n")
  *                  or disable ("-n")
  *          size:       non-zero length of C string in @buf
  * Output:
  *  On success: status of zero or more protocol versions has
  *          been updated; passed-in buffer filled with
  *          '\n'-terminated C string containing positive
  *          or negative integer values representing the
  *          current status of each protocol version;
  *          return code is the size in bytes of the string
  *  On error:   return code is zero or a negative errno value
  */
 static ssize_t write_versions(struct file *file, char *buf, size_t size)
 {
     ssize_t rv;
 
     mutex_lock(&nfsd_mutex);
     rv = __write_versions(file, buf, size);
     mutex_unlock(&nfsd_mutex);
     return rv;
 }
 
 /*
  * Zero-length write.  Return a list of NFSD's current listener
  * transports.
  */
 static ssize_t __write_ports_names(char *buf, struct net *net)
 {
     struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 
     if (nn->nfsd_serv == NULL)
         return 0;
     return svc_xprt_names(nn->nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
 }
 
 /*
  * A single 'fd' number was written, in which case it must be for
  * a socket of a supported family/protocol, and we use it as an
  * nfsd listener.
  */
 static ssize_t __write_ports_addfd(char *buf, struct net *net, const struct cred *cred)
 {
     char *mesg = buf;
     int fd, err;
     struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 
     err = get_int(&mesg, &fd);
     if (err != 0 || fd < 0)
         return -EINVAL;
 
     if (svc_alien_sock(net, fd)) {
         printk(KERN_ERR "%s: socket net is different to NFSd's one\n", __func__);
         return -EINVAL;
     }
 
     err = nfsd_create_serv(net);
     if (err != 0)
         return err;
 
     err = svc_addsock(nn->nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT, cred);
 
     if (err >= 0 &&
         !nn->nfsd_serv->sv_nrthreads && !xchg(&nn->keep_active, 1))
         svc_get(nn->nfsd_serv);
 
     nfsd_put(net);
     return err;
 }
 
 /*
  * A transport listener is added by writing it's transport name and
  * a port number.
  */
 static ssize_t __write_ports_addxprt(char *buf, struct net *net, const struct cred *cred)
 {
     char transport[16];
     struct svc_xprt *xprt;
     int port, err;
     struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 
     if (sscanf(buf, "%15s %5u", transport, &port) != 2)
         return -EINVAL;
 
     if (port < 1 || port > USHRT_MAX)
         return -EINVAL;
 
     err = nfsd_create_serv(net);
     if (err != 0)
         return err;
 
     err = svc_xprt_create(nn->nfsd_serv, transport, net,
                   PF_INET, port, SVC_SOCK_ANONYMOUS, cred);
     if (err < 0)
         goto out_err;
 
     err = svc_xprt_create(nn->nfsd_serv, transport, net,
                   PF_INET6, port, SVC_SOCK_ANONYMOUS, cred);
     if (err < 0 && err != -EAFNOSUPPORT)
         goto out_close;
 
     if (!nn->nfsd_serv->sv_nrthreads && !xchg(&nn->keep_active, 1))
         svc_get(nn->nfsd_serv);
 
     nfsd_put(net);
     return 0;
 out_close:
     xprt = svc_find_xprt(nn->nfsd_serv, transport, net, PF_INET, port);
     if (xprt != NULL) {
         svc_xprt_close(xprt);
         svc_xprt_put(xprt);
     }
 out_err:
     nfsd_put(net);
     return err;
 }
 
 static ssize_t __write_ports(struct file *file, char *buf, size_t size,
                  struct net *net)
 {
     if (size == 0)
         return __write_ports_names(buf, net);
 
     if (isdigit(buf[0]))
         return __write_ports_addfd(buf, net, file->f_cred);
 
     if (isalpha(buf[0]))
         return __write_ports_addxprt(buf, net, file->f_cred);
 
     return -EINVAL;
 }
 
 /*
  * write_ports - Pass a socket file descriptor or transport name to listen on
  *
  * Input:
  *          buf:        ignored
  *          size:       zero
  * Output:
  *  On success: passed-in buffer filled with a '\n'-terminated C
  *          string containing a whitespace-separated list of
  *          named NFSD listeners;
  *          return code is the size in bytes of the string
  *  On error:   return code is zero or a negative errno value
  *
  * OR
  *
  * Input:
  *          buf:        C string containing an unsigned
  *                  integer value representing a bound
  *                  but unconnected socket that is to be
  *                  used as an NFSD listener; listen(3)
  *                  must be called for a SOCK_STREAM
  *                  socket, otherwise it is ignored
  *          size:       non-zero length of C string in @buf
  * Output:
  *  On success: NFS service is started;
  *          passed-in buffer filled with a '\n'-terminated C
  *          string containing a unique alphanumeric name of
  *          the listener;
  *          return code is the size in bytes of the string
  *  On error:   return code is a negative errno value
  *
  * OR
  *
  * Input:
  *          buf:        C string containing a transport
  *                  name and an unsigned integer value
  *                  representing the port to listen on,
  *                  separated by whitespace
  *          size:       non-zero length of C string in @buf
  * Output:
  *  On success: returns zero; NFS service is started
  *  On error:   return code is a negative errno value
  */
 static ssize_t write_ports(struct file *file, char *buf, size_t size)
 {
     ssize_t rv;
 
     mutex_lock(&nfsd_mutex);
     rv = __write_ports(file, buf, size, netns(file));
     mutex_unlock(&nfsd_mutex);
     return rv;
 }
 
 
 int nfsd_max_blksize;
 
 /*
  * write_maxblksize - Set or report the current NFS blksize
  *
  * Input:
  *          buf:        ignored
  *          size:       zero
  *
  * OR
  *
  * Input:
  *          buf:        C string containing an unsigned
  *                  integer value representing the new
  *                  NFS blksize
  *          size:       non-zero length of C string in @buf
  * Output:
  *  On success: passed-in buffer filled with '\n'-terminated C string
  *          containing numeric value of the current NFS blksize
  *          setting;
  *          return code is the size in bytes of the string
  *  On error:   return code is zero or a negative errno value
  */
 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
 {
     char *mesg = buf;
     struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
 
     if (size > 0) {
         int bsize;
         int rv = get_int(&mesg, &bsize);
         if (rv)
             return rv;
         /* force bsize into allowed range and
          * required alignment.
          */
         bsize = max_t(int, bsize, 1024);
         bsize = min_t(int, bsize, NFSSVC_MAXBLKSIZE);
         bsize &= ~(1024-1);
         mutex_lock(&nfsd_mutex);
         if (nn->nfsd_serv) {
             mutex_unlock(&nfsd_mutex);
             return -EBUSY;
         }
         nfsd_max_blksize = bsize;
         mutex_unlock(&nfsd_mutex);
     }
 
     return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
                             nfsd_max_blksize);
 }
 
 /*
  * write_maxconn - Set or report the current max number of connections
  *
  * Input:
  *          buf:        ignored
  *          size:       zero
  * OR
  *
  * Input:
  *          buf:        C string containing an unsigned
  *                  integer value representing the new
  *                  number of max connections
  *          size:       non-zero length of C string in @buf
  * Output:
  *  On success: passed-in buffer filled with '\n'-terminated C string
  *          containing numeric value of max_connections setting
  *          for this net namespace;
  *          return code is the size in bytes of the string
  *  On error:   return code is zero or a negative errno value
  */
 static ssize_t write_maxconn(struct file *file, char *buf, size_t size)
 {
     char *mesg = buf;
     struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
     unsigned int maxconn = nn->max_connections;
 
     if (size > 0) {
         int rv = get_uint(&mesg, &maxconn);
 
         if (rv)
             return rv;
         nn->max_connections = maxconn;
     }
 
     return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%u\n", maxconn);
 }
 
 #ifdef CONFIG_NFSD_V4
 static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size,
                   time64_t *time, struct nfsd_net *nn)
 {
     char *mesg = buf;
     int rv, i;
 
     if (size > 0) {
         if (nn->nfsd_serv)
             return -EBUSY;
         rv = get_int(&mesg, &i);
         if (rv)
             return rv;
         /*
          * Some sanity checking.  We don't have a reason for
          * these particular numbers, but problems with the
          * extremes are:
          *  - Too short: the briefest network outage may
          *    cause clients to lose all their locks.  Also,
          *    the frequent polling may be wasteful.
          *  - Too long: do you really want reboot recovery
          *    to take more than an hour?  Or to make other
          *    clients wait an hour before being able to
          *    revoke a dead client's locks?
          */
         if (i < 10 || i > 3600)
             return -EINVAL;
         *time = i;
     }
 
     return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%lld\n", *time);
 }
 
 static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size,
                 time64_t *time, struct nfsd_net *nn)
 {
     ssize_t rv;
 
     mutex_lock(&nfsd_mutex);
     rv = __nfsd4_write_time(file, buf, size, time, nn);
     mutex_unlock(&nfsd_mutex);
     return rv;
 }
 
 /*
  * write_leasetime - Set or report the current NFSv4 lease time
  *
  * Input:
  *          buf:        ignored
  *          size:       zero
  *
  * OR
  *
  * Input:
  *          buf:        C string containing an unsigned
  *                  integer value representing the new
  *                  NFSv4 lease expiry time
  *          size:       non-zero length of C string in @buf
  * Output:
  *  On success: passed-in buffer filled with '\n'-terminated C
  *          string containing unsigned integer value of the
  *          current lease expiry time;
  *          return code is the size in bytes of the string
  *  On error:   return code is zero or a negative errno value
  */
 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
 {
     struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
     return nfsd4_write_time(file, buf, size, &nn->nfsd4_lease, nn);
 }
 
 /*
  * write_gracetime - Set or report current NFSv4 grace period time
  *
  * As above, but sets the time of the NFSv4 grace period.
  *
  * Note this should never be set to less than the *previous*
  * lease-period time, but we don't try to enforce this.  (In the common
  * case (a new boot), we don't know what the previous lease time was
  * anyway.)
  */
 static ssize_t write_gracetime(struct file *file, char *buf, size_t size)
 {
     struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
     return nfsd4_write_time(file, buf, size, &nn->nfsd4_grace, nn);
 }
 
 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size,
                    struct nfsd_net *nn)
 {
     char *mesg = buf;
     char *recdir;
     int len, status;
 
     if (size > 0) {
         if (nn->nfsd_serv)
             return -EBUSY;
         if (size > PATH_MAX || buf[size-1] != '\n')
             return -EINVAL;
         buf[size-1] = 0;
 
         recdir = mesg;
         len = qword_get(&mesg, recdir, size);
         if (len <= 0)
             return -EINVAL;
 
         status = nfs4_reset_recoverydir(recdir);
         if (status)
             return status;
     }
 
     return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
                             nfs4_recoverydir());
 }
 
 /*
  * write_recoverydir - Set or report the pathname of the recovery directory
  *
  * Input:
  *          buf:        ignored
  *          size:       zero
  *
  * OR
  *
  * Input:
  *          buf:        C string containing the pathname
  *                  of the directory on a local file
  *                  system containing permanent NFSv4
  *                  recovery data
  *          size:       non-zero length of C string in @buf
  * Output:
  *  On success: passed-in buffer filled with '\n'-terminated C string
  *          containing the current recovery pathname setting;
  *          return code is the size in bytes of the string
  *  On error:   return code is zero or a negative errno value
  */
 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
 {
     ssize_t rv;
     struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
 
     mutex_lock(&nfsd_mutex);
     rv = __write_recoverydir(file, buf, size, nn);
     mutex_unlock(&nfsd_mutex);
     return rv;
 }
 
 /*
  * write_v4_end_grace - release grace period for nfsd's v4.x lock manager
  *
  * Input:
  *          buf:        ignored
  *          size:       zero
  * OR
  *
  * Input:
  *          buf:        any value
  *          size:       non-zero length of C string in @buf
  * Output:
  *          passed-in buffer filled with "Y" or "N" with a newline
  *          and NULL-terminated C string. This indicates whether
  *          the grace period has ended in the current net
  *          namespace. Return code is the size in bytes of the
  *          string. Writing a string that starts with 'Y', 'y', or
  *          '1' to the file will end the grace period for nfsd's v4
  *          lock manager.
  */
 static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size)
 {
     struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
 
     if (size > 0) {
         switch(buf[0]) {
         case 'Y':
         case 'y':
         case '1':
             if (!nn->nfsd_serv)
                 return -EBUSY;
             nfsd4_end_grace(nn);
             break;
         default:
             return -EINVAL;
         }
     }
 
     return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%c\n",
              nn->grace_ended ? 'Y' : 'N');
 }
 
 #endif
 
 /*----------------------------------------------------------------------------*/
 /*
  *  populating the filesystem.
  */
 
 /* Basically copying rpc_get_inode. */
 static struct inode *nfsd_get_inode(struct super_block *sb, umode_t mode)
 {
     struct inode *inode = new_inode(sb);
     if (!inode)
         return NULL;
     /* Following advice from simple_fill_super documentation: */
     inode->i_ino = iunique(sb, NFSD_MaxReserved);
     inode->i_mode = mode;
     inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
     switch (mode & S_IFMT) {
     case S_IFDIR:
         inode->i_fop = &simple_dir_operations;
         inode->i_op = &simple_dir_inode_operations;
         inc_nlink(inode);
         break;
     default:
         break;
     }
     return inode;
 }
 
 static int __nfsd_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode, struct nfsdfs_client *ncl)
 {
     struct inode *inode;
 
     inode = nfsd_get_inode(dir->i_sb, mode);
     if (!inode)
         return -ENOMEM;
     if (ncl) {
         inode->i_private = ncl;
         kref_get(&ncl->cl_ref);
     }
     d_add(dentry, inode);
     inc_nlink(dir);
     fsnotify_mkdir(dir, dentry);
     return 0;
 }
 
 static struct dentry *nfsd_mkdir(struct dentry *parent, struct nfsdfs_client *ncl, char *name)
 {
     struct inode *dir = parent->d_inode;
     struct dentry *dentry;
     int ret = -ENOMEM;
 
     inode_lock(dir);
     dentry = d_alloc_name(parent, name);
     if (!dentry)
         goto out_err;
     ret = __nfsd_mkdir(d_inode(parent), dentry, S_IFDIR | 0600, ncl);
     if (ret)
         goto out_err;
 out:
     inode_unlock(dir);
     return dentry;
 out_err:
     dput(dentry);
     dentry = ERR_PTR(ret);
     goto out;
 }
 
 static void clear_ncl(struct inode *inode)
 {
     struct nfsdfs_client *ncl = inode->i_private;
 
     inode->i_private = NULL;
     kref_put(&ncl->cl_ref, ncl->cl_release);
 }
 
 static struct nfsdfs_client *__get_nfsdfs_client(struct inode *inode)
 {
     struct nfsdfs_client *nc = inode->i_private;
 
     if (nc)
         kref_get(&nc->cl_ref);
     return nc;
 }
 
 struct nfsdfs_client *get_nfsdfs_client(struct inode *inode)
 {
     struct nfsdfs_client *nc;
 
     inode_lock_shared(inode);
     nc = __get_nfsdfs_client(inode);
     inode_unlock_shared(inode);
     return nc;
 }
 /* from __rpc_unlink */
 static void nfsdfs_remove_file(struct inode *dir, struct dentry *dentry)
 {
     int ret;
 
     clear_ncl(d_inode(dentry));
     dget(dentry);
     ret = simple_unlink(dir, dentry);
     d_drop(dentry);
     fsnotify_unlink(dir, dentry);
     dput(dentry);
     WARN_ON_ONCE(ret);
 }
 
 static void nfsdfs_remove_files(struct dentry *root)
 {
     struct dentry *dentry, *tmp;
 
     list_for_each_entry_safe(dentry, tmp, &root->d_subdirs, d_child) {
         if (!simple_positive(dentry)) {
             WARN_ON_ONCE(1); /* I think this can't happen? */
             continue;
         }
         nfsdfs_remove_file(d_inode(root), dentry);
     }
 }
 
 /* XXX: cut'n'paste from simple_fill_super; figure out if we could share
  * code instead. */
 static  int nfsdfs_create_files(struct dentry *root,
                 const struct tree_descr *files,
                 struct dentry **fdentries)
 {
     struct inode *dir = d_inode(root);
     struct inode *inode;
     struct dentry *dentry;
     int i;
 
     inode_lock(dir);
     for (i = 0; files->name && files->name[0]; i++, files++) {
         dentry = d_alloc_name(root, files->name);
         if (!dentry)
             goto out;
         inode = nfsd_get_inode(d_inode(root)->i_sb,
                     S_IFREG | files->mode);
         if (!inode) {
             dput(dentry);
             goto out;
         }
         inode->i_fop = files->ops;
         inode->i_private = __get_nfsdfs_client(dir);
         d_add(dentry, inode);
         fsnotify_create(dir, dentry);
         if (fdentries)
             fdentries[i] = dentry;
     }
     inode_unlock(dir);
     return 0;
 out:
     nfsdfs_remove_files(root);
     inode_unlock(dir);
     return -ENOMEM;
 }
 
 /* on success, returns positive number unique to that client. */
 struct dentry *nfsd_client_mkdir(struct nfsd_net *nn,
                  struct nfsdfs_client *ncl, u32 id,
                  const struct tree_descr *files,
                  struct dentry **fdentries)
 {
     struct dentry *dentry;
     char name[11];
     int ret;
 
     sprintf(name, "%u", id);
 
     dentry = nfsd_mkdir(nn->nfsd_client_dir, ncl, name);
     if (IS_ERR(dentry)) /* XXX: tossing errors? */
         return NULL;
     ret = nfsdfs_create_files(dentry, files, fdentries);
     if (ret) {
         nfsd_client_rmdir(dentry);
         return NULL;
     }
     return dentry;
 }
 
 /* Taken from __rpc_rmdir: */
 void nfsd_client_rmdir(struct dentry *dentry)
 {
     struct inode *dir = d_inode(dentry->d_parent);
     struct inode *inode = d_inode(dentry);
     int ret;
 
     inode_lock(dir);
     nfsdfs_remove_files(dentry);
     clear_ncl(inode);
     dget(dentry);
     ret = simple_rmdir(dir, dentry);
     WARN_ON_ONCE(ret);
     d_drop(dentry);
     fsnotify_rmdir(dir, dentry);
     dput(dentry);
     inode_unlock(dir);
 }
 
 static int nfsd_fill_super(struct super_block *sb, struct fs_context *fc)
 {
     struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
                             nfsd_net_id);
     struct dentry *dentry;
     int ret;
 
     static const struct tree_descr nfsd_files[] = {
         [NFSD_List] = {"exports", &exports_nfsd_operations, S_IRUGO},
         /* Per-export io stats use same ops as exports file */
         [NFSD_Export_Stats] = {"export_stats", &exports_nfsd_operations, S_IRUGO},
         [NFSD_Export_features] = {"export_features",
                     &export_features_operations, S_IRUGO},
         [NFSD_FO_UnlockIP] = {"unlock_ip",
                     &transaction_ops, S_IWUSR|S_IRUSR},
         [NFSD_FO_UnlockFS] = {"unlock_filesystem",
                     &transaction_ops, S_IWUSR|S_IRUSR},
         [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
         [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
         [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
         [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
         [NFSD_Reply_Cache_Stats] = {"reply_cache_stats", &reply_cache_stats_operations, S_IRUGO},
         [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
         [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
         [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
         [NFSD_MaxConnections] = {"max_connections", &transaction_ops, S_IWUSR|S_IRUGO},
         [NFSD_Filecache] = {"filecache", &filecache_ops, S_IRUGO},
 #if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
         [NFSD_SupportedEnctypes] = {"supported_krb5_enctypes", &supported_enctypes_ops, S_IRUGO},
 #endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
 #ifdef CONFIG_NFSD_V4
         [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
         [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
         [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
         [NFSD_V4EndGrace] = {"v4_end_grace", &transaction_ops, S_IWUSR|S_IRUGO},
 #endif
         /* last one */ {""}
     };
 
     ret = simple_fill_super(sb, 0x6e667364, nfsd_files);
     if (ret)
         return ret;
     dentry = nfsd_mkdir(sb->s_root, NULL, "clients");
     if (IS_ERR(dentry))
         return PTR_ERR(dentry);
     nn->nfsd_client_dir = dentry;
     return 0;
 }
 
 static int nfsd_fs_get_tree(struct fs_context *fc)
 {
     return get_tree_keyed(fc, nfsd_fill_super, get_net(fc->net_ns));
 }
 
 static void nfsd_fs_free_fc(struct fs_context *fc)
 {
     if (fc->s_fs_info)
         put_net(fc->s_fs_info);
 }
 
 static const struct fs_context_operations nfsd_fs_context_ops = {
     .free       = nfsd_fs_free_fc,
     .get_tree   = nfsd_fs_get_tree,
 };
 
 static int nfsd_init_fs_context(struct fs_context *fc)
 {
     put_user_ns(fc->user_ns);
     fc->user_ns = get_user_ns(fc->net_ns->user_ns);
     fc->ops = &nfsd_fs_context_ops;
     return 0;
 }
 
 static void nfsd_umount(struct super_block *sb)
 {
     struct net *net = sb->s_fs_info;
 
     nfsd_shutdown_threads(net);
 
     kill_litter_super(sb);
     put_net(net);
 }
 
 static struct file_system_type nfsd_fs_type = {
     .owner      = THIS_MODULE,
     .name       = "nfsd",
     .init_fs_context = nfsd_init_fs_context,
     .kill_sb    = nfsd_umount,
 };
 MODULE_ALIAS_FS("nfsd");
 
 #ifdef CONFIG_PROC_FS
 static int create_proc_exports_entry(void)
 {
     struct proc_dir_entry *entry;
 
     entry = proc_mkdir("fs/nfs", NULL);
     if (!entry)
         return -ENOMEM;
     entry = proc_create("exports", 0, entry, &exports_proc_ops);
     if (!entry) {
         remove_proc_entry("fs/nfs", NULL);
         return -ENOMEM;
     }
     return 0;
 }
 #else /* CONFIG_PROC_FS */
 static int create_proc_exports_entry(void)
 {
     return 0;
 }
 #endif
 
 unsigned int nfsd_net_id;
 
 static __net_init int nfsd_init_net(struct net *net)
 {
     int retval;
     struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 
     retval = nfsd_export_init(net);
     if (retval)
         goto out_export_error;
     retval = nfsd_idmap_init(net);
     if (retval)
         goto out_idmap_error;
     nn->nfsd_versions = NULL;
     nn->nfsd4_minorversions = NULL;
     retval = nfsd_reply_cache_init(nn);
     if (retval)
         goto out_drc_error;
     nfsd4_init_leases_net(nn);
 
     get_random_bytes(&nn->siphash_key, sizeof(nn->siphash_key));
     seqlock_init(&nn->writeverf_lock);
 
     return 0;
 
 out_drc_error:
     nfsd_idmap_shutdown(net);
 out_idmap_error:
     nfsd_export_shutdown(net);
 out_export_error:
     return retval;
 }
 
 static __net_exit void nfsd_exit_net(struct net *net)
 {
     struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 
     nfsd_reply_cache_shutdown(nn);
     nfsd_idmap_shutdown(net);
     nfsd_export_shutdown(net);
     nfsd_netns_free_versions(net_generic(net, nfsd_net_id));
 }
 
 static struct pernet_operations nfsd_net_ops = {
     .init = nfsd_init_net,
     .exit = nfsd_exit_net,
     .id   = &nfsd_net_id,
     .size = sizeof(struct nfsd_net),
 };
 
 static int __init init_nfsd(void)
 {
     int retval;
 
     retval = nfsd4_init_slabs();
     if (retval)
         return retval;
     retval = nfsd4_init_pnfs();
     if (retval)
         goto out_free_slabs;
     retval = nfsd_stat_init();  /* Statistics */
     if (retval)
         goto out_free_pnfs;
     retval = nfsd_drc_slab_create();
     if (retval)
         goto out_free_stat;
     nfsd_lockd_init();  /* lockd->nfsd callbacks */
     retval = create_proc_exports_entry();
     if (retval)
         goto out_free_lockd;
     retval = register_pernet_subsys(&nfsd_net_ops);
     if (retval < 0)
         goto out_free_exports;
     retval = register_cld_notifier();
     if (retval)
         goto out_free_subsys;
     retval = nfsd4_create_laundry_wq();
     if (retval)
         goto out_free_cld;
     retval = register_filesystem(&nfsd_fs_type);
     if (retval)
         goto out_free_all;
     return 0;
 out_free_all:
     nfsd4_destroy_laundry_wq();
 out_free_cld:
     unregister_cld_notifier();
 out_free_subsys:
     unregister_pernet_subsys(&nfsd_net_ops);
 out_free_exports:
     remove_proc_entry("fs/nfs/exports", NULL);
     remove_proc_entry("fs/nfs", NULL);
 out_free_lockd:
     nfsd_lockd_shutdown();
     nfsd_drc_slab_free();
 out_free_stat:
     nfsd_stat_shutdown();
 out_free_pnfs:
     nfsd4_exit_pnfs();
 out_free_slabs:
     nfsd4_free_slabs();
     return retval;
 }
 
 static void __exit exit_nfsd(void)
 {
     unregister_filesystem(&nfsd_fs_type);
     nfsd4_destroy_laundry_wq();
     unregister_cld_notifier();
     unregister_pernet_subsys(&nfsd_net_ops);
     nfsd_drc_slab_free();
     remove_proc_entry("fs/nfs/exports", NULL);
     remove_proc_entry("fs/nfs", NULL);
     nfsd_stat_shutdown();
     nfsd_lockd_shutdown();
     nfsd4_free_slabs();
     nfsd4_exit_pnfs();
 }
 
 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
 MODULE_LICENSE("GPL");
 module_init(init_nfsd)
 module_exit(exit_nfsd)

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