2 * Syscall interface to knfsd.
4 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
7 #include <linux/namei.h>
8 #include <linux/ctype.h>
10 #include <linux/nfsd_idmap.h>
11 #include <linux/sunrpc/svcsock.h>
12 #include <linux/nfsd/syscall.h>
13 #include <linux/lockd/lockd.h>
14 #include <linux/sunrpc/clnt.h>
20 * We have a single directory with 9 nodes in it.
43 * The below MUST come last. Otherwise we leave a hole in nfsd_files[]
44 * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
54 * write() for these nodes.
56 static ssize_t write_svc(struct file *file, char *buf, size_t size);
57 static ssize_t write_add(struct file *file, char *buf, size_t size);
58 static ssize_t write_del(struct file *file, char *buf, size_t size);
59 static ssize_t write_export(struct file *file, char *buf, size_t size);
60 static ssize_t write_unexport(struct file *file, char *buf, size_t size);
61 static ssize_t write_getfd(struct file *file, char *buf, size_t size);
62 static ssize_t write_getfs(struct file *file, char *buf, size_t size);
63 static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
64 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size);
65 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size);
66 static ssize_t write_threads(struct file *file, char *buf, size_t size);
67 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
68 static ssize_t write_versions(struct file *file, char *buf, size_t size);
69 static ssize_t write_ports(struct file *file, char *buf, size_t size);
70 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
72 static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
73 static ssize_t write_gracetime(struct file *file, char *buf, size_t size);
74 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
77 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
78 [NFSD_Svc] = write_svc,
79 [NFSD_Add] = write_add,
80 [NFSD_Del] = write_del,
81 [NFSD_Export] = write_export,
82 [NFSD_Unexport] = write_unexport,
83 [NFSD_Getfd] = write_getfd,
84 [NFSD_Getfs] = write_getfs,
85 [NFSD_Fh] = write_filehandle,
86 [NFSD_FO_UnlockIP] = write_unlock_ip,
87 [NFSD_FO_UnlockFS] = write_unlock_fs,
88 [NFSD_Threads] = write_threads,
89 [NFSD_Pool_Threads] = write_pool_threads,
90 [NFSD_Versions] = write_versions,
91 [NFSD_Ports] = write_ports,
92 [NFSD_MaxBlkSize] = write_maxblksize,
94 [NFSD_Leasetime] = write_leasetime,
95 [NFSD_Gracetime] = write_gracetime,
96 [NFSD_RecoveryDir] = write_recoverydir,
100 static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
102 ino_t ino = file->f_path.dentry->d_inode->i_ino;
106 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
109 data = simple_transaction_get(file, buf, size);
111 return PTR_ERR(data);
113 rv = write_op[ino](file, data, size);
115 simple_transaction_set(file, rv);
121 static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
123 if (! file->private_data) {
124 /* An attempt to read a transaction file without writing
125 * causes a 0-byte write so that the file can return
128 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
132 return simple_transaction_read(file, buf, size, pos);
135 static const struct file_operations transaction_ops = {
136 .write = nfsctl_transaction_write,
137 .read = nfsctl_transaction_read,
138 .release = simple_transaction_release,
141 static int exports_open(struct inode *inode, struct file *file)
143 return seq_open(file, &nfs_exports_op);
146 static const struct file_operations exports_operations = {
147 .open = exports_open,
150 .release = seq_release,
151 .owner = THIS_MODULE,
154 static int export_features_show(struct seq_file *m, void *v)
156 seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS);
160 static int export_features_open(struct inode *inode, struct file *file)
162 return single_open(file, export_features_show, NULL);
165 static struct file_operations export_features_operations = {
166 .open = export_features_open,
169 .release = single_release,
172 extern int nfsd_pool_stats_open(struct inode *inode, struct file *file);
173 extern int nfsd_pool_stats_release(struct inode *inode, struct file *file);
175 static const struct file_operations pool_stats_operations = {
176 .open = nfsd_pool_stats_open,
179 .release = nfsd_pool_stats_release,
180 .owner = THIS_MODULE,
183 /*----------------------------------------------------------------------------*/
185 * payload - write methods
189 * write_svc - Start kernel's NFSD server
191 * Deprecated. /proc/fs/nfsd/threads is preferred.
192 * Function remains to support old versions of nfs-utils.
195 * buf: struct nfsctl_svc
196 * svc_port: port number of this
198 * svc_nthreads: number of threads to start
199 * size: size in bytes of passed in nfsctl_svc
201 * On success: returns zero
202 * On error: return code is negative errno value
204 static ssize_t write_svc(struct file *file, char *buf, size_t size)
206 struct nfsctl_svc *data;
208 if (size < sizeof(*data))
210 data = (struct nfsctl_svc*) buf;
211 err = nfsd_svc(data->svc_port, data->svc_nthreads);
218 * write_add - Add or modify client entry in auth unix cache
220 * Deprecated. /proc/net/rpc/auth.unix.ip is preferred.
221 * Function remains to support old versions of nfs-utils.
224 * buf: struct nfsctl_client
225 * cl_ident: '\0'-terminated C string
226 * containing domain name
228 * cl_naddr: no. of items in cl_addrlist
229 * cl_addrlist: array of client addresses
230 * cl_fhkeytype: ignored
231 * cl_fhkeylen: ignored
233 * size: size in bytes of passed in nfsctl_client
235 * On success: returns zero
236 * On error: return code is negative errno value
238 * Note: Only AF_INET client addresses are passed in, since
239 * nfsctl_client.cl_addrlist contains only in_addr fields for addresses.
241 static ssize_t write_add(struct file *file, char *buf, size_t size)
243 struct nfsctl_client *data;
244 if (size < sizeof(*data))
246 data = (struct nfsctl_client *)buf;
247 return exp_addclient(data);
251 * write_del - Remove client from auth unix cache
253 * Deprecated. /proc/net/rpc/auth.unix.ip is preferred.
254 * Function remains to support old versions of nfs-utils.
257 * buf: struct nfsctl_client
258 * cl_ident: '\0'-terminated C string
259 * containing domain name
262 * cl_addrlist: ignored
263 * cl_fhkeytype: ignored
264 * cl_fhkeylen: ignored
266 * size: size in bytes of passed in nfsctl_client
268 * On success: returns zero
269 * On error: return code is negative errno value
271 * Note: Only AF_INET client addresses are passed in, since
272 * nfsctl_client.cl_addrlist contains only in_addr fields for addresses.
274 static ssize_t write_del(struct file *file, char *buf, size_t size)
276 struct nfsctl_client *data;
277 if (size < sizeof(*data))
279 data = (struct nfsctl_client *)buf;
280 return exp_delclient(data);
284 * write_export - Export part or all of a local file system
286 * Deprecated. /proc/net/rpc/{nfsd.export,nfsd.fh} are preferred.
287 * Function remains to support old versions of nfs-utils.
290 * buf: struct nfsctl_export
291 * ex_client: '\0'-terminated C string
292 * containing domain name
293 * of client allowed to access
295 * ex_path: '\0'-terminated C string
296 * containing pathname of
297 * directory in local file system
298 * ex_dev: fsid to use for this export
300 * ex_flags: export flags for this export
301 * ex_anon_uid: UID to use for anonymous
303 * ex_anon_gid: GID to use for anonymous
305 * size: size in bytes of passed in nfsctl_export
307 * On success: returns zero
308 * On error: return code is negative errno value
310 static ssize_t write_export(struct file *file, char *buf, size_t size)
312 struct nfsctl_export *data;
313 if (size < sizeof(*data))
315 data = (struct nfsctl_export*)buf;
316 return exp_export(data);
320 * write_unexport - Unexport a previously exported file system
322 * Deprecated. /proc/net/rpc/{nfsd.export,nfsd.fh} are preferred.
323 * Function remains to support old versions of nfs-utils.
326 * buf: struct nfsctl_export
327 * ex_client: '\0'-terminated C string
328 * containing domain name
329 * of client no longer allowed
330 * to access this export
331 * ex_path: '\0'-terminated C string
332 * containing pathname of
333 * directory in local file system
337 * ex_anon_uid: ignored
338 * ex_anon_gid: ignored
339 * size: size in bytes of passed in nfsctl_export
341 * On success: returns zero
342 * On error: return code is negative errno value
344 static ssize_t write_unexport(struct file *file, char *buf, size_t size)
346 struct nfsctl_export *data;
348 if (size < sizeof(*data))
350 data = (struct nfsctl_export*)buf;
351 return exp_unexport(data);
355 * write_getfs - Get a variable-length NFS file handle by path
357 * Deprecated. /proc/fs/nfsd/filehandle is preferred.
358 * Function remains to support old versions of nfs-utils.
361 * buf: struct nfsctl_fsparm
362 * gd_addr: socket address of client
363 * gd_path: '\0'-terminated C string
364 * containing pathname of
365 * directory in local file system
366 * gd_maxlen: maximum size of returned file
368 * size: size in bytes of passed in nfsctl_fsparm
370 * On success: passed-in buffer filled with a knfsd_fh structure
371 * (a variable-length raw NFS file handle);
372 * return code is the size in bytes of the file handle
373 * On error: return code is negative errno value
375 * Note: Only AF_INET client addresses are passed in, since gd_addr
376 * is the same size as a struct sockaddr_in.
378 static ssize_t write_getfs(struct file *file, char *buf, size_t size)
380 struct nfsctl_fsparm *data;
381 struct sockaddr_in *sin;
382 struct auth_domain *clp;
384 struct knfsd_fh *res;
387 if (size < sizeof(*data))
389 data = (struct nfsctl_fsparm*)buf;
390 err = -EPROTONOSUPPORT;
391 if (data->gd_addr.sa_family != AF_INET)
393 sin = (struct sockaddr_in *)&data->gd_addr;
394 if (data->gd_maxlen > NFS3_FHSIZE)
395 data->gd_maxlen = NFS3_FHSIZE;
397 res = (struct knfsd_fh*)buf;
401 ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
403 clp = auth_unix_lookup(&in6);
407 err = exp_rootfh(clp, data->gd_path, res, data->gd_maxlen);
408 auth_domain_put(clp);
412 err = res->fh_size + offsetof(struct knfsd_fh, fh_base);
418 * write_getfd - Get a fixed-length NFS file handle by path (used by mountd)
420 * Deprecated. /proc/fs/nfsd/filehandle is preferred.
421 * Function remains to support old versions of nfs-utils.
424 * buf: struct nfsctl_fdparm
425 * gd_addr: socket address of client
426 * gd_path: '\0'-terminated C string
427 * containing pathname of
428 * directory in local file system
429 * gd_version: fdparm structure version
430 * size: size in bytes of passed in nfsctl_fdparm
432 * On success: passed-in buffer filled with nfsctl_res
433 * (a fixed-length raw NFS file handle);
434 * return code is the size in bytes of the file handle
435 * On error: return code is negative errno value
437 * Note: Only AF_INET client addresses are passed in, since gd_addr
438 * is the same size as a struct sockaddr_in.
440 static ssize_t write_getfd(struct file *file, char *buf, size_t size)
442 struct nfsctl_fdparm *data;
443 struct sockaddr_in *sin;
444 struct auth_domain *clp;
450 if (size < sizeof(*data))
452 data = (struct nfsctl_fdparm*)buf;
453 err = -EPROTONOSUPPORT;
454 if (data->gd_addr.sa_family != AF_INET)
457 if (data->gd_version < 2 || data->gd_version > NFSSVC_MAXVERS)
461 sin = (struct sockaddr_in *)&data->gd_addr;
464 ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
466 clp = auth_unix_lookup(&in6);
470 err = exp_rootfh(clp, data->gd_path, &fh, NFS_FHSIZE);
471 auth_domain_put(clp);
476 memset(res,0, NFS_FHSIZE);
477 memcpy(res, &fh.fh_base, fh.fh_size);
485 * write_unlock_ip - Release all locks used by a client
490 * buf: '\n'-terminated C string containing a
491 * presentation format IP address
492 * size: length of C string in @buf
494 * On success: returns zero if all specified locks were released;
495 * returns one if one or more locks were not released
496 * On error: return code is negative errno value
498 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
500 struct sockaddr_storage address;
501 struct sockaddr *sap = (struct sockaddr *)&address;
502 size_t salen = sizeof(address);
509 if (buf[size-1] != '\n')
513 if (qword_get(&buf, fo_path, size) < 0)
516 if (rpc_pton(fo_path, size, sap, salen) == 0)
519 return nlmsvc_unlock_all_by_ip(sap);
523 * write_unlock_fs - Release all locks on a local file system
528 * buf: '\n'-terminated C string containing the
529 * absolute pathname of a local file system
530 * size: length of C string in @buf
532 * On success: returns zero if all specified locks were released;
533 * returns one if one or more locks were not released
534 * On error: return code is negative errno value
536 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
546 if (buf[size-1] != '\n')
550 if (qword_get(&buf, fo_path, size) < 0)
553 error = kern_path(fo_path, 0, &path);
558 * XXX: Needs better sanity checking. Otherwise we could end up
559 * releasing locks on the wrong file system.
562 * 1. Does the path refer to a directory?
563 * 2. Is that directory a mount point, or
564 * 3. Is that directory the root of an exported file system?
566 error = nlmsvc_unlock_all_by_sb(path.mnt->mnt_sb);
573 * write_filehandle - Get a variable-length NFS file handle by path
575 * On input, the buffer contains a '\n'-terminated C string comprised of
576 * three alphanumeric words separated by whitespace. The string may
577 * contain escape sequences.
581 * domain: client domain name
582 * path: export pathname
583 * maxsize: numeric maximum size of
585 * size: length of C string in @buf
587 * On success: passed-in buffer filled with '\n'-terminated C
588 * string containing a ASCII hex text version
589 * of the NFS file handle;
590 * return code is the size in bytes of the string
591 * On error: return code is negative errno value
593 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
596 int uninitialized_var(maxsize);
599 struct auth_domain *dom;
605 if (buf[size-1] != '\n')
610 len = qword_get(&mesg, dname, size);
615 len = qword_get(&mesg, path, size);
619 len = get_int(&mesg, &maxsize);
623 if (maxsize < NFS_FHSIZE)
625 if (maxsize > NFS3_FHSIZE)
626 maxsize = NFS3_FHSIZE;
628 if (qword_get(&mesg, mesg, size)>0)
631 /* we have all the words, they are in buf.. */
632 dom = unix_domain_find(dname);
636 len = exp_rootfh(dom, path, &fh, maxsize);
637 auth_domain_put(dom);
642 len = SIMPLE_TRANSACTION_LIMIT;
643 qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
649 * write_threads - Start NFSD, or report the current number of running threads
655 * On success: passed-in buffer filled with '\n'-terminated C
656 * string numeric value representing the number of
657 * running NFSD threads;
658 * return code is the size in bytes of the string
659 * On error: return code is zero
664 * buf: C string containing an unsigned
665 * integer value representing the
666 * number of NFSD threads to start
667 * size: non-zero length of C string in @buf
669 * On success: NFS service is started;
670 * passed-in buffer filled with '\n'-terminated C
671 * string numeric value representing the number of
672 * running NFSD threads;
673 * return code is the size in bytes of the string
674 * On error: return code is zero or a negative errno value
676 static ssize_t write_threads(struct file *file, char *buf, size_t size)
682 rv = get_int(&mesg, &newthreads);
687 rv = nfsd_svc(NFS_PORT, newthreads);
691 rv = nfsd_nrthreads();
693 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
697 * write_pool_threads - Set or report the current number of threads per pool
706 * buf: C string containing whitespace-
707 * separated unsigned integer values
708 * representing the number of NFSD
709 * threads to start in each pool
710 * size: non-zero length of C string in @buf
712 * On success: passed-in buffer filled with '\n'-terminated C
713 * string containing integer values representing the
714 * number of NFSD threads in each pool;
715 * return code is the size in bytes of the string
716 * On error: return code is zero or a negative errno value
718 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
720 /* if size > 0, look for an array of number of threads per node
721 * and apply them then write out number of threads per node as reply
730 mutex_lock(&nfsd_mutex);
731 npools = nfsd_nrpools();
734 * NFS is shut down. The admin can start it by
735 * writing to the threads file but NOT the pool_threads
736 * file, sorry. Report zero threads.
738 mutex_unlock(&nfsd_mutex);
743 nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
745 if (nthreads == NULL)
749 for (i = 0; i < npools; i++) {
750 rv = get_int(&mesg, &nthreads[i]);
752 break; /* fewer numbers than pools */
754 goto out_free; /* syntax error */
759 rv = nfsd_set_nrthreads(i, nthreads);
764 rv = nfsd_get_nrthreads(npools, nthreads);
769 size = SIMPLE_TRANSACTION_LIMIT;
770 for (i = 0; i < npools && size > 0; i++) {
771 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
779 mutex_unlock(&nfsd_mutex);
783 static ssize_t __write_versions(struct file *file, char *buf, size_t size)
786 char *vers, *minorp, sign;
787 int len, num, remaining;
794 /* Cannot change versions without updating
795 * nfsd_serv->sv_xdrsize, and reallocing
796 * rq_argp and rq_resp
799 if (buf[size-1] != '\n')
804 len = qword_get(&mesg, vers, size);
805 if (len <= 0) return -EINVAL;
808 if (sign == '+' || sign == '-')
809 num = simple_strtol((vers+1), &minorp, 0);
811 num = simple_strtol(vers, &minorp, 0);
812 if (*minorp == '.') {
815 minor = simple_strtoul(minorp+1, NULL, 0);
818 if (nfsd_minorversion(minor, sign == '-' ?
819 NFSD_CLEAR : NFSD_SET) < 0)
827 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
834 } while ((len = qword_get(&mesg, vers, size)) > 0);
835 /* If all get turned off, turn them back on, as
836 * having no versions is BAD
838 nfsd_reset_versions();
841 /* Now write current state into reply buffer */
844 remaining = SIMPLE_TRANSACTION_LIMIT;
845 for (num=2 ; num <= 4 ; num++)
846 if (nfsd_vers(num, NFSD_AVAIL)) {
847 len = snprintf(buf, remaining, "%s%c%d", sep,
848 nfsd_vers(num, NFSD_TEST)?'+':'-',
858 if (nfsd_vers(4, NFSD_AVAIL))
859 for (minor = 1; minor <= NFSD_SUPPORTED_MINOR_VERSION;
861 len = snprintf(buf, remaining, " %c4.%u",
862 (nfsd_vers(4, NFSD_TEST) &&
863 nfsd_minorversion(minor, NFSD_TEST)) ?
874 len = snprintf(buf, remaining, "\n");
881 * write_versions - Set or report the available NFS protocol versions
887 * On success: passed-in buffer filled with '\n'-terminated C
888 * string containing positive or negative integer
889 * values representing the current status of each
891 * return code is the size in bytes of the string
892 * On error: return code is zero or a negative errno value
897 * buf: C string containing whitespace-
898 * separated positive or negative
899 * integer values representing NFS
900 * protocol versions to enable ("+n")
902 * size: non-zero length of C string in @buf
904 * On success: status of zero or more protocol versions has
905 * been updated; passed-in buffer filled with
906 * '\n'-terminated C string containing positive
907 * or negative integer values representing the
908 * current status of each protocol version;
909 * return code is the size in bytes of the string
910 * On error: return code is zero or a negative errno value
912 static ssize_t write_versions(struct file *file, char *buf, size_t size)
916 mutex_lock(&nfsd_mutex);
917 rv = __write_versions(file, buf, size);
918 mutex_unlock(&nfsd_mutex);
923 * Zero-length write. Return a list of NFSD's current listener
926 static ssize_t __write_ports_names(char *buf)
928 if (nfsd_serv == NULL)
930 return svc_xprt_names(nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
934 * A single 'fd' number was written, in which case it must be for
935 * a socket of a supported family/protocol, and we use it as an
938 static ssize_t __write_ports_addfd(char *buf)
943 err = get_int(&mesg, &fd);
944 if (err != 0 || fd < 0)
947 err = nfsd_create_serv();
955 err = svc_addsock(nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT);
960 /* Decrease the count, but don't shut down the service */
961 nfsd_serv->sv_nrthreads--;
966 * A '-' followed by the 'name' of a socket means we close the socket.
968 static ssize_t __write_ports_delfd(char *buf)
973 toclose = kstrdup(buf + 1, GFP_KERNEL);
977 if (nfsd_serv != NULL)
978 len = svc_sock_names(nfsd_serv, buf,
979 SIMPLE_TRANSACTION_LIMIT, toclose);
988 * A transport listener is added by writing it's transport name and
991 static ssize_t __write_ports_addxprt(char *buf)
994 struct svc_xprt *xprt;
997 if (sscanf(buf, "%15s %4u", transport, &port) != 2)
1000 if (port < 1 || port > USHORT_MAX)
1003 err = nfsd_create_serv();
1007 err = svc_create_xprt(nfsd_serv, transport,
1008 PF_INET, port, SVC_SOCK_ANONYMOUS);
1012 err = svc_create_xprt(nfsd_serv, transport,
1013 PF_INET6, port, SVC_SOCK_ANONYMOUS);
1014 if (err < 0 && err != -EAFNOSUPPORT)
1018 xprt = svc_find_xprt(nfsd_serv, transport, PF_INET, port);
1020 svc_close_xprt(xprt);
1024 /* Decrease the count, but don't shut down the service */
1025 nfsd_serv->sv_nrthreads--;
1030 * A transport listener is removed by writing a "-", it's transport
1031 * name, and it's port number.
1033 static ssize_t __write_ports_delxprt(char *buf)
1035 struct svc_xprt *xprt;
1039 if (sscanf(&buf[1], "%15s %4u", transport, &port) != 2)
1042 if (port < 1 || port > USHORT_MAX || nfsd_serv == NULL)
1045 xprt = svc_find_xprt(nfsd_serv, transport, AF_UNSPEC, port);
1049 svc_close_xprt(xprt);
1054 static ssize_t __write_ports(struct file *file, char *buf, size_t size)
1057 return __write_ports_names(buf);
1059 if (isdigit(buf[0]))
1060 return __write_ports_addfd(buf);
1062 if (buf[0] == '-' && isdigit(buf[1]))
1063 return __write_ports_delfd(buf);
1065 if (isalpha(buf[0]))
1066 return __write_ports_addxprt(buf);
1068 if (buf[0] == '-' && isalpha(buf[1]))
1069 return __write_ports_delxprt(buf);
1075 * write_ports - Pass a socket file descriptor or transport name to listen on
1081 * On success: passed-in buffer filled with a '\n'-terminated C
1082 * string containing a whitespace-separated list of
1083 * named NFSD listeners;
1084 * return code is the size in bytes of the string
1085 * On error: return code is zero or a negative errno value
1090 * buf: C string containing an unsigned
1091 * integer value representing a bound
1092 * but unconnected socket that is to be
1093 * used as an NFSD listener; listen(3)
1094 * must be called for a SOCK_STREAM
1095 * socket, otherwise it is ignored
1096 * size: non-zero length of C string in @buf
1098 * On success: NFS service is started;
1099 * passed-in buffer filled with a '\n'-terminated C
1100 * string containing a unique alphanumeric name of
1102 * return code is the size in bytes of the string
1103 * On error: return code is a negative errno value
1108 * buf: C string containing a "-" followed
1109 * by an integer value representing a
1110 * previously passed in socket file
1112 * size: non-zero length of C string in @buf
1114 * On success: NFS service no longer listens on that socket;
1115 * passed-in buffer filled with a '\n'-terminated C
1116 * string containing a unique name of the listener;
1117 * return code is the size in bytes of the string
1118 * On error: return code is a negative errno value
1123 * buf: C string containing a transport
1124 * name and an unsigned integer value
1125 * representing the port to listen on,
1126 * separated by whitespace
1127 * size: non-zero length of C string in @buf
1129 * On success: returns zero; NFS service is started
1130 * On error: return code is a negative errno value
1135 * buf: C string containing a "-" followed
1136 * by a transport name and an unsigned
1137 * integer value representing the port
1138 * to listen on, separated by whitespace
1139 * size: non-zero length of C string in @buf
1141 * On success: returns zero; NFS service no longer listens
1143 * On error: return code is a negative errno value
1145 static ssize_t write_ports(struct file *file, char *buf, size_t size)
1149 mutex_lock(&nfsd_mutex);
1150 rv = __write_ports(file, buf, size);
1151 mutex_unlock(&nfsd_mutex);
1156 int nfsd_max_blksize;
1159 * write_maxblksize - Set or report the current NFS blksize
1168 * buf: C string containing an unsigned
1169 * integer value representing the new
1171 * size: non-zero length of C string in @buf
1173 * On success: passed-in buffer filled with '\n'-terminated C string
1174 * containing numeric value of the current NFS blksize
1176 * return code is the size in bytes of the string
1177 * On error: return code is zero or a negative errno value
1179 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
1184 int rv = get_int(&mesg, &bsize);
1187 /* force bsize into allowed range and
1188 * required alignment.
1192 if (bsize > NFSSVC_MAXBLKSIZE)
1193 bsize = NFSSVC_MAXBLKSIZE;
1195 mutex_lock(&nfsd_mutex);
1196 if (nfsd_serv && nfsd_serv->sv_nrthreads) {
1197 mutex_unlock(&nfsd_mutex);
1200 nfsd_max_blksize = bsize;
1201 mutex_unlock(&nfsd_mutex);
1204 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
1208 #ifdef CONFIG_NFSD_V4
1209 static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size, time_t *time)
1217 rv = get_int(&mesg, &i);
1221 * Some sanity checking. We don't have a reason for
1222 * these particular numbers, but problems with the
1224 * - Too short: the briefest network outage may
1225 * cause clients to lose all their locks. Also,
1226 * the frequent polling may be wasteful.
1227 * - Too long: do you really want reboot recovery
1228 * to take more than an hour? Or to make other
1229 * clients wait an hour before being able to
1230 * revoke a dead client's locks?
1232 if (i < 10 || i > 3600)
1237 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%ld\n", *time);
1240 static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size, time_t *time)
1244 mutex_lock(&nfsd_mutex);
1245 rv = __nfsd4_write_time(file, buf, size, time);
1246 mutex_unlock(&nfsd_mutex);
1251 * write_leasetime - Set or report the current NFSv4 lease time
1260 * buf: C string containing an unsigned
1261 * integer value representing the new
1262 * NFSv4 lease expiry time
1263 * size: non-zero length of C string in @buf
1265 * On success: passed-in buffer filled with '\n'-terminated C
1266 * string containing unsigned integer value of the
1267 * current lease expiry time;
1268 * return code is the size in bytes of the string
1269 * On error: return code is zero or a negative errno value
1271 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
1273 return nfsd4_write_time(file, buf, size, &nfsd4_lease);
1277 * write_gracetime - Set or report current NFSv4 grace period time
1279 * As above, but sets the time of the NFSv4 grace period.
1281 * Note this should never be set to less than the *previous*
1282 * lease-period time, but we don't try to enforce this. (In the common
1283 * case (a new boot), we don't know what the previous lease time was
1286 static ssize_t write_gracetime(struct file *file, char *buf, size_t size)
1288 return nfsd4_write_time(file, buf, size, &nfsd4_grace);
1291 extern char *nfs4_recoverydir(void);
1293 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size)
1302 if (size > PATH_MAX || buf[size-1] != '\n')
1307 len = qword_get(&mesg, recdir, size);
1311 status = nfs4_reset_recoverydir(recdir);
1314 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
1315 nfs4_recoverydir());
1319 * write_recoverydir - Set or report the pathname of the recovery directory
1328 * buf: C string containing the pathname
1329 * of the directory on a local file
1330 * system containing permanent NFSv4
1332 * size: non-zero length of C string in @buf
1334 * On success: passed-in buffer filled with '\n'-terminated C string
1335 * containing the current recovery pathname setting;
1336 * return code is the size in bytes of the string
1337 * On error: return code is zero or a negative errno value
1339 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
1343 mutex_lock(&nfsd_mutex);
1344 rv = __write_recoverydir(file, buf, size);
1345 mutex_unlock(&nfsd_mutex);
1351 /*----------------------------------------------------------------------------*/
1353 * populating the filesystem.
1356 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
1358 static struct tree_descr nfsd_files[] = {
1359 [NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR},
1360 [NFSD_Add] = {".add", &transaction_ops, S_IWUSR},
1361 [NFSD_Del] = {".del", &transaction_ops, S_IWUSR},
1362 [NFSD_Export] = {".export", &transaction_ops, S_IWUSR},
1363 [NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR},
1364 [NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR|S_IRUSR},
1365 [NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR|S_IRUSR},
1366 [NFSD_List] = {"exports", &exports_operations, S_IRUGO},
1367 [NFSD_Export_features] = {"export_features",
1368 &export_features_operations, S_IRUGO},
1369 [NFSD_FO_UnlockIP] = {"unlock_ip",
1370 &transaction_ops, S_IWUSR|S_IRUSR},
1371 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1372 &transaction_ops, S_IWUSR|S_IRUSR},
1373 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1374 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1375 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1376 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1377 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1378 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1379 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1380 #ifdef CONFIG_NFSD_V4
1381 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1382 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
1383 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1387 return simple_fill_super(sb, 0x6e667364, nfsd_files);
1390 static int nfsd_get_sb(struct file_system_type *fs_type,
1391 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
1393 return get_sb_single(fs_type, flags, data, nfsd_fill_super, mnt);
1396 static struct file_system_type nfsd_fs_type = {
1397 .owner = THIS_MODULE,
1399 .get_sb = nfsd_get_sb,
1400 .kill_sb = kill_litter_super,
1403 #ifdef CONFIG_PROC_FS
1404 static int create_proc_exports_entry(void)
1406 struct proc_dir_entry *entry;
1408 entry = proc_mkdir("fs/nfs", NULL);
1411 entry = proc_create("exports", 0, entry, &exports_operations);
1416 #else /* CONFIG_PROC_FS */
1417 static int create_proc_exports_entry(void)
1423 static int __init init_nfsd(void)
1426 printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
1428 retval = nfs4_state_init(); /* nfs4 locking state */
1431 nfsd_stat_init(); /* Statistics */
1432 retval = nfsd_reply_cache_init();
1435 retval = nfsd_export_init();
1437 goto out_free_cache;
1438 nfsd_lockd_init(); /* lockd->nfsd callbacks */
1439 retval = nfsd_idmap_init();
1441 goto out_free_lockd;
1442 retval = create_proc_exports_entry();
1444 goto out_free_idmap;
1445 retval = register_filesystem(&nfsd_fs_type);
1450 remove_proc_entry("fs/nfs/exports", NULL);
1451 remove_proc_entry("fs/nfs", NULL);
1453 nfsd_idmap_shutdown();
1455 nfsd_lockd_shutdown();
1456 nfsd_export_shutdown();
1458 nfsd_reply_cache_shutdown();
1460 nfsd_stat_shutdown();
1465 static void __exit exit_nfsd(void)
1467 nfsd_export_shutdown();
1468 nfsd_reply_cache_shutdown();
1469 remove_proc_entry("fs/nfs/exports", NULL);
1470 remove_proc_entry("fs/nfs", NULL);
1471 nfsd_stat_shutdown();
1472 nfsd_lockd_shutdown();
1473 nfsd_idmap_shutdown();
1475 unregister_filesystem(&nfsd_fs_type);
1478 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1479 MODULE_LICENSE("GPL");
1480 module_init(init_nfsd)
1481 module_exit(exit_nfsd)