2 * Syscall interface to knfsd.
4 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
7 #include <linux/slab.h>
8 #include <linux/namei.h>
9 #include <linux/ctype.h>
11 #include <linux/nfsd_idmap.h>
12 #include <linux/sunrpc/svcsock.h>
13 #include <linux/nfsd/syscall.h>
14 #include <linux/lockd/lockd.h>
15 #include <linux/sunrpc/clnt.h>
21 * We have a single directory with 9 nodes in it.
44 * The below MUST come last. Otherwise we leave a hole in nfsd_files[]
45 * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
55 * write() for these nodes.
57 static ssize_t write_svc(struct file *file, char *buf, size_t size);
58 static ssize_t write_add(struct file *file, char *buf, size_t size);
59 static ssize_t write_del(struct file *file, char *buf, size_t size);
60 static ssize_t write_export(struct file *file, char *buf, size_t size);
61 static ssize_t write_unexport(struct file *file, char *buf, size_t size);
62 static ssize_t write_getfd(struct file *file, char *buf, size_t size);
63 static ssize_t write_getfs(struct file *file, char *buf, size_t size);
64 static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
65 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size);
66 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size);
67 static ssize_t write_threads(struct file *file, char *buf, size_t size);
68 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
69 static ssize_t write_versions(struct file *file, char *buf, size_t size);
70 static ssize_t write_ports(struct file *file, char *buf, size_t size);
71 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
73 static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
74 static ssize_t write_gracetime(struct file *file, char *buf, size_t size);
75 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
78 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
79 [NFSD_Svc] = write_svc,
80 [NFSD_Add] = write_add,
81 [NFSD_Del] = write_del,
82 [NFSD_Export] = write_export,
83 [NFSD_Unexport] = write_unexport,
84 [NFSD_Getfd] = write_getfd,
85 [NFSD_Getfs] = write_getfs,
86 [NFSD_Fh] = write_filehandle,
87 [NFSD_FO_UnlockIP] = write_unlock_ip,
88 [NFSD_FO_UnlockFS] = write_unlock_fs,
89 [NFSD_Threads] = write_threads,
90 [NFSD_Pool_Threads] = write_pool_threads,
91 [NFSD_Versions] = write_versions,
92 [NFSD_Ports] = write_ports,
93 [NFSD_MaxBlkSize] = write_maxblksize,
95 [NFSD_Leasetime] = write_leasetime,
96 [NFSD_Gracetime] = write_gracetime,
97 [NFSD_RecoveryDir] = write_recoverydir,
101 static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
103 ino_t ino = file->f_path.dentry->d_inode->i_ino;
107 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
110 data = simple_transaction_get(file, buf, size);
112 return PTR_ERR(data);
114 rv = write_op[ino](file, data, size);
116 simple_transaction_set(file, rv);
122 static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
124 if (! file->private_data) {
125 /* An attempt to read a transaction file without writing
126 * causes a 0-byte write so that the file can return
129 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
133 return simple_transaction_read(file, buf, size, pos);
136 static const struct file_operations transaction_ops = {
137 .write = nfsctl_transaction_write,
138 .read = nfsctl_transaction_read,
139 .release = simple_transaction_release,
140 .llseek = default_llseek,
143 static int exports_open(struct inode *inode, struct file *file)
145 return seq_open(file, &nfs_exports_op);
148 static const struct file_operations exports_operations = {
149 .open = exports_open,
152 .release = seq_release,
153 .owner = THIS_MODULE,
156 static int export_features_show(struct seq_file *m, void *v)
158 seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS);
162 static int export_features_open(struct inode *inode, struct file *file)
164 return single_open(file, export_features_show, NULL);
167 static struct file_operations export_features_operations = {
168 .open = export_features_open,
171 .release = single_release,
174 extern int nfsd_pool_stats_open(struct inode *inode, struct file *file);
175 extern int nfsd_pool_stats_release(struct inode *inode, struct file *file);
177 static const struct file_operations pool_stats_operations = {
178 .open = nfsd_pool_stats_open,
181 .release = nfsd_pool_stats_release,
182 .owner = THIS_MODULE,
185 /*----------------------------------------------------------------------------*/
187 * payload - write methods
191 * write_svc - Start kernel's NFSD server
193 * Deprecated. /proc/fs/nfsd/threads is preferred.
194 * Function remains to support old versions of nfs-utils.
197 * buf: struct nfsctl_svc
198 * svc_port: port number of this
200 * svc_nthreads: number of threads to start
201 * size: size in bytes of passed in nfsctl_svc
203 * On success: returns zero
204 * On error: return code is negative errno value
206 static ssize_t write_svc(struct file *file, char *buf, size_t size)
208 struct nfsctl_svc *data;
210 if (size < sizeof(*data))
212 data = (struct nfsctl_svc*) buf;
213 err = nfsd_svc(data->svc_port, data->svc_nthreads);
220 * write_add - Add or modify client entry in auth unix cache
222 * Deprecated. /proc/net/rpc/auth.unix.ip is preferred.
223 * Function remains to support old versions of nfs-utils.
226 * buf: struct nfsctl_client
227 * cl_ident: '\0'-terminated C string
228 * containing domain name
230 * cl_naddr: no. of items in cl_addrlist
231 * cl_addrlist: array of client addresses
232 * cl_fhkeytype: ignored
233 * cl_fhkeylen: ignored
235 * size: size in bytes of passed in nfsctl_client
237 * On success: returns zero
238 * On error: return code is negative errno value
240 * Note: Only AF_INET client addresses are passed in, since
241 * nfsctl_client.cl_addrlist contains only in_addr fields for addresses.
243 static ssize_t write_add(struct file *file, char *buf, size_t size)
245 struct nfsctl_client *data;
246 if (size < sizeof(*data))
248 data = (struct nfsctl_client *)buf;
249 return exp_addclient(data);
253 * write_del - Remove client from auth unix cache
255 * Deprecated. /proc/net/rpc/auth.unix.ip is preferred.
256 * Function remains to support old versions of nfs-utils.
259 * buf: struct nfsctl_client
260 * cl_ident: '\0'-terminated C string
261 * containing domain name
264 * cl_addrlist: ignored
265 * cl_fhkeytype: ignored
266 * cl_fhkeylen: ignored
268 * size: size in bytes of passed in nfsctl_client
270 * On success: returns zero
271 * On error: return code is negative errno value
273 * Note: Only AF_INET client addresses are passed in, since
274 * nfsctl_client.cl_addrlist contains only in_addr fields for addresses.
276 static ssize_t write_del(struct file *file, char *buf, size_t size)
278 struct nfsctl_client *data;
279 if (size < sizeof(*data))
281 data = (struct nfsctl_client *)buf;
282 return exp_delclient(data);
286 * write_export - Export part or all of a local file system
288 * Deprecated. /proc/net/rpc/{nfsd.export,nfsd.fh} are preferred.
289 * Function remains to support old versions of nfs-utils.
292 * buf: struct nfsctl_export
293 * ex_client: '\0'-terminated C string
294 * containing domain name
295 * of client allowed to access
297 * ex_path: '\0'-terminated C string
298 * containing pathname of
299 * directory in local file system
300 * ex_dev: fsid to use for this export
302 * ex_flags: export flags for this export
303 * ex_anon_uid: UID to use for anonymous
305 * ex_anon_gid: GID to use for anonymous
307 * size: size in bytes of passed in nfsctl_export
309 * On success: returns zero
310 * On error: return code is negative errno value
312 static ssize_t write_export(struct file *file, char *buf, size_t size)
314 struct nfsctl_export *data;
315 if (size < sizeof(*data))
317 data = (struct nfsctl_export*)buf;
318 return exp_export(data);
322 * write_unexport - Unexport a previously exported file system
324 * Deprecated. /proc/net/rpc/{nfsd.export,nfsd.fh} are preferred.
325 * Function remains to support old versions of nfs-utils.
328 * buf: struct nfsctl_export
329 * ex_client: '\0'-terminated C string
330 * containing domain name
331 * of client no longer allowed
332 * to access this export
333 * ex_path: '\0'-terminated C string
334 * containing pathname of
335 * directory in local file system
339 * ex_anon_uid: ignored
340 * ex_anon_gid: ignored
341 * size: size in bytes of passed in nfsctl_export
343 * On success: returns zero
344 * On error: return code is negative errno value
346 static ssize_t write_unexport(struct file *file, char *buf, size_t size)
348 struct nfsctl_export *data;
350 if (size < sizeof(*data))
352 data = (struct nfsctl_export*)buf;
353 return exp_unexport(data);
357 * write_getfs - Get a variable-length NFS file handle by path
359 * Deprecated. /proc/fs/nfsd/filehandle is preferred.
360 * Function remains to support old versions of nfs-utils.
363 * buf: struct nfsctl_fsparm
364 * gd_addr: socket address of client
365 * gd_path: '\0'-terminated C string
366 * containing pathname of
367 * directory in local file system
368 * gd_maxlen: maximum size of returned file
370 * size: size in bytes of passed in nfsctl_fsparm
372 * On success: passed-in buffer filled with a knfsd_fh structure
373 * (a variable-length raw NFS file handle);
374 * return code is the size in bytes of the file handle
375 * On error: return code is negative errno value
377 * Note: Only AF_INET client addresses are passed in, since gd_addr
378 * is the same size as a struct sockaddr_in.
380 static ssize_t write_getfs(struct file *file, char *buf, size_t size)
382 struct nfsctl_fsparm *data;
383 struct sockaddr_in *sin;
384 struct auth_domain *clp;
386 struct knfsd_fh *res;
389 if (size < sizeof(*data))
391 data = (struct nfsctl_fsparm*)buf;
392 err = -EPROTONOSUPPORT;
393 if (data->gd_addr.sa_family != AF_INET)
395 sin = (struct sockaddr_in *)&data->gd_addr;
396 if (data->gd_maxlen > NFS3_FHSIZE)
397 data->gd_maxlen = NFS3_FHSIZE;
399 res = (struct knfsd_fh*)buf;
403 ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
405 clp = auth_unix_lookup(&in6);
409 err = exp_rootfh(clp, data->gd_path, res, data->gd_maxlen);
410 auth_domain_put(clp);
414 err = res->fh_size + offsetof(struct knfsd_fh, fh_base);
420 * write_getfd - Get a fixed-length NFS file handle by path (used by mountd)
422 * Deprecated. /proc/fs/nfsd/filehandle is preferred.
423 * Function remains to support old versions of nfs-utils.
426 * buf: struct nfsctl_fdparm
427 * gd_addr: socket address of client
428 * gd_path: '\0'-terminated C string
429 * containing pathname of
430 * directory in local file system
431 * gd_version: fdparm structure version
432 * size: size in bytes of passed in nfsctl_fdparm
434 * On success: passed-in buffer filled with nfsctl_res
435 * (a fixed-length raw NFS file handle);
436 * return code is the size in bytes of the file handle
437 * On error: return code is negative errno value
439 * Note: Only AF_INET client addresses are passed in, since gd_addr
440 * is the same size as a struct sockaddr_in.
442 static ssize_t write_getfd(struct file *file, char *buf, size_t size)
444 struct nfsctl_fdparm *data;
445 struct sockaddr_in *sin;
446 struct auth_domain *clp;
452 if (size < sizeof(*data))
454 data = (struct nfsctl_fdparm*)buf;
455 err = -EPROTONOSUPPORT;
456 if (data->gd_addr.sa_family != AF_INET)
459 if (data->gd_version < 2 || data->gd_version > NFSSVC_MAXVERS)
463 sin = (struct sockaddr_in *)&data->gd_addr;
466 ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
468 clp = auth_unix_lookup(&in6);
472 err = exp_rootfh(clp, data->gd_path, &fh, NFS_FHSIZE);
473 auth_domain_put(clp);
478 memset(res,0, NFS_FHSIZE);
479 memcpy(res, &fh.fh_base, fh.fh_size);
487 * write_unlock_ip - Release all locks used by a client
492 * buf: '\n'-terminated C string containing a
493 * presentation format IP address
494 * size: length of C string in @buf
496 * On success: returns zero if all specified locks were released;
497 * returns one if one or more locks were not released
498 * On error: return code is negative errno value
500 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
502 struct sockaddr_storage address;
503 struct sockaddr *sap = (struct sockaddr *)&address;
504 size_t salen = sizeof(address);
511 if (buf[size-1] != '\n')
515 if (qword_get(&buf, fo_path, size) < 0)
518 if (rpc_pton(fo_path, size, sap, salen) == 0)
521 return nlmsvc_unlock_all_by_ip(sap);
525 * write_unlock_fs - Release all locks on a local file system
530 * buf: '\n'-terminated C string containing the
531 * absolute pathname of a local file system
532 * size: length of C string in @buf
534 * On success: returns zero if all specified locks were released;
535 * returns one if one or more locks were not released
536 * On error: return code is negative errno value
538 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
548 if (buf[size-1] != '\n')
552 if (qword_get(&buf, fo_path, size) < 0)
555 error = kern_path(fo_path, 0, &path);
560 * XXX: Needs better sanity checking. Otherwise we could end up
561 * releasing locks on the wrong file system.
564 * 1. Does the path refer to a directory?
565 * 2. Is that directory a mount point, or
566 * 3. Is that directory the root of an exported file system?
568 error = nlmsvc_unlock_all_by_sb(path.mnt->mnt_sb);
575 * write_filehandle - Get a variable-length NFS file handle by path
577 * On input, the buffer contains a '\n'-terminated C string comprised of
578 * three alphanumeric words separated by whitespace. The string may
579 * contain escape sequences.
583 * domain: client domain name
584 * path: export pathname
585 * maxsize: numeric maximum size of
587 * size: length of C string in @buf
589 * On success: passed-in buffer filled with '\n'-terminated C
590 * string containing a ASCII hex text version
591 * of the NFS file handle;
592 * return code is the size in bytes of the string
593 * On error: return code is negative errno value
595 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
598 int uninitialized_var(maxsize);
601 struct auth_domain *dom;
607 if (buf[size-1] != '\n')
612 len = qword_get(&mesg, dname, size);
617 len = qword_get(&mesg, path, size);
621 len = get_int(&mesg, &maxsize);
625 if (maxsize < NFS_FHSIZE)
627 if (maxsize > NFS3_FHSIZE)
628 maxsize = NFS3_FHSIZE;
630 if (qword_get(&mesg, mesg, size)>0)
633 /* we have all the words, they are in buf.. */
634 dom = unix_domain_find(dname);
638 len = exp_rootfh(dom, path, &fh, maxsize);
639 auth_domain_put(dom);
644 len = SIMPLE_TRANSACTION_LIMIT;
645 qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
651 * write_threads - Start NFSD, or report the current number of running threads
657 * On success: passed-in buffer filled with '\n'-terminated C
658 * string numeric value representing the number of
659 * running NFSD threads;
660 * return code is the size in bytes of the string
661 * On error: return code is zero
666 * buf: C string containing an unsigned
667 * integer value representing the
668 * number of NFSD threads to start
669 * size: non-zero length of C string in @buf
671 * On success: NFS service is started;
672 * passed-in buffer filled with '\n'-terminated C
673 * string numeric value representing the number of
674 * running NFSD threads;
675 * return code is the size in bytes of the string
676 * On error: return code is zero or a negative errno value
678 static ssize_t write_threads(struct file *file, char *buf, size_t size)
684 rv = get_int(&mesg, &newthreads);
689 rv = nfsd_svc(NFS_PORT, newthreads);
693 rv = nfsd_nrthreads();
695 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
699 * write_pool_threads - Set or report the current number of threads per pool
708 * buf: C string containing whitespace-
709 * separated unsigned integer values
710 * representing the number of NFSD
711 * threads to start in each pool
712 * size: non-zero length of C string in @buf
714 * On success: passed-in buffer filled with '\n'-terminated C
715 * string containing integer values representing the
716 * number of NFSD threads in each pool;
717 * return code is the size in bytes of the string
718 * On error: return code is zero or a negative errno value
720 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
722 /* if size > 0, look for an array of number of threads per node
723 * and apply them then write out number of threads per node as reply
732 mutex_lock(&nfsd_mutex);
733 npools = nfsd_nrpools();
736 * NFS is shut down. The admin can start it by
737 * writing to the threads file but NOT the pool_threads
738 * file, sorry. Report zero threads.
740 mutex_unlock(&nfsd_mutex);
745 nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
747 if (nthreads == NULL)
751 for (i = 0; i < npools; i++) {
752 rv = get_int(&mesg, &nthreads[i]);
754 break; /* fewer numbers than pools */
756 goto out_free; /* syntax error */
761 rv = nfsd_set_nrthreads(i, nthreads);
766 rv = nfsd_get_nrthreads(npools, nthreads);
771 size = SIMPLE_TRANSACTION_LIMIT;
772 for (i = 0; i < npools && size > 0; i++) {
773 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
781 mutex_unlock(&nfsd_mutex);
785 static ssize_t __write_versions(struct file *file, char *buf, size_t size)
788 char *vers, *minorp, sign;
789 int len, num, remaining;
796 /* Cannot change versions without updating
797 * nfsd_serv->sv_xdrsize, and reallocing
798 * rq_argp and rq_resp
801 if (buf[size-1] != '\n')
806 len = qword_get(&mesg, vers, size);
807 if (len <= 0) return -EINVAL;
810 if (sign == '+' || sign == '-')
811 num = simple_strtol((vers+1), &minorp, 0);
813 num = simple_strtol(vers, &minorp, 0);
814 if (*minorp == '.') {
817 minor = simple_strtoul(minorp+1, NULL, 0);
820 if (nfsd_minorversion(minor, sign == '-' ?
821 NFSD_CLEAR : NFSD_SET) < 0)
829 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
836 } while ((len = qword_get(&mesg, vers, size)) > 0);
837 /* If all get turned off, turn them back on, as
838 * having no versions is BAD
840 nfsd_reset_versions();
843 /* Now write current state into reply buffer */
846 remaining = SIMPLE_TRANSACTION_LIMIT;
847 for (num=2 ; num <= 4 ; num++)
848 if (nfsd_vers(num, NFSD_AVAIL)) {
849 len = snprintf(buf, remaining, "%s%c%d", sep,
850 nfsd_vers(num, NFSD_TEST)?'+':'-',
860 if (nfsd_vers(4, NFSD_AVAIL))
861 for (minor = 1; minor <= NFSD_SUPPORTED_MINOR_VERSION;
863 len = snprintf(buf, remaining, " %c4.%u",
864 (nfsd_vers(4, NFSD_TEST) &&
865 nfsd_minorversion(minor, NFSD_TEST)) ?
876 len = snprintf(buf, remaining, "\n");
883 * write_versions - Set or report the available NFS protocol versions
889 * On success: passed-in buffer filled with '\n'-terminated C
890 * string containing positive or negative integer
891 * values representing the current status of each
893 * return code is the size in bytes of the string
894 * On error: return code is zero or a negative errno value
899 * buf: C string containing whitespace-
900 * separated positive or negative
901 * integer values representing NFS
902 * protocol versions to enable ("+n")
904 * size: non-zero length of C string in @buf
906 * On success: status of zero or more protocol versions has
907 * been updated; passed-in buffer filled with
908 * '\n'-terminated C string containing positive
909 * or negative integer values representing the
910 * current status of each protocol version;
911 * return code is the size in bytes of the string
912 * On error: return code is zero or a negative errno value
914 static ssize_t write_versions(struct file *file, char *buf, size_t size)
918 mutex_lock(&nfsd_mutex);
919 rv = __write_versions(file, buf, size);
920 mutex_unlock(&nfsd_mutex);
925 * Zero-length write. Return a list of NFSD's current listener
928 static ssize_t __write_ports_names(char *buf)
930 if (nfsd_serv == NULL)
932 return svc_xprt_names(nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
936 * A single 'fd' number was written, in which case it must be for
937 * a socket of a supported family/protocol, and we use it as an
940 static ssize_t __write_ports_addfd(char *buf)
945 err = get_int(&mesg, &fd);
946 if (err != 0 || fd < 0)
949 err = nfsd_create_serv();
953 err = svc_addsock(nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT);
955 svc_destroy(nfsd_serv);
959 /* Decrease the count, but don't shut down the service */
960 nfsd_serv->sv_nrthreads--;
965 * A '-' followed by the 'name' of a socket means we close the socket.
967 static ssize_t __write_ports_delfd(char *buf)
972 toclose = kstrdup(buf + 1, GFP_KERNEL);
976 if (nfsd_serv != NULL)
977 len = svc_sock_names(nfsd_serv, buf,
978 SIMPLE_TRANSACTION_LIMIT, toclose);
984 * A transport listener is added by writing it's transport name and
987 static ssize_t __write_ports_addxprt(char *buf)
990 struct svc_xprt *xprt;
993 if (sscanf(buf, "%15s %4u", transport, &port) != 2)
996 if (port < 1 || port > USHRT_MAX)
999 err = nfsd_create_serv();
1003 err = svc_create_xprt(nfsd_serv, transport,
1004 PF_INET, port, SVC_SOCK_ANONYMOUS);
1008 err = svc_create_xprt(nfsd_serv, transport,
1009 PF_INET6, port, SVC_SOCK_ANONYMOUS);
1010 if (err < 0 && err != -EAFNOSUPPORT)
1013 /* Decrease the count, but don't shut down the service */
1014 nfsd_serv->sv_nrthreads--;
1017 xprt = svc_find_xprt(nfsd_serv, transport, PF_INET, port);
1019 svc_close_xprt(xprt);
1023 svc_destroy(nfsd_serv);
1028 * A transport listener is removed by writing a "-", it's transport
1029 * name, and it's port number.
1031 static ssize_t __write_ports_delxprt(char *buf)
1033 struct svc_xprt *xprt;
1037 if (sscanf(&buf[1], "%15s %4u", transport, &port) != 2)
1040 if (port < 1 || port > USHRT_MAX || nfsd_serv == NULL)
1043 xprt = svc_find_xprt(nfsd_serv, transport, AF_UNSPEC, port);
1047 svc_close_xprt(xprt);
1052 static ssize_t __write_ports(struct file *file, char *buf, size_t size)
1055 return __write_ports_names(buf);
1057 if (isdigit(buf[0]))
1058 return __write_ports_addfd(buf);
1060 if (buf[0] == '-' && isdigit(buf[1]))
1061 return __write_ports_delfd(buf);
1063 if (isalpha(buf[0]))
1064 return __write_ports_addxprt(buf);
1066 if (buf[0] == '-' && isalpha(buf[1]))
1067 return __write_ports_delxprt(buf);
1073 * write_ports - Pass a socket file descriptor or transport name to listen on
1079 * On success: passed-in buffer filled with a '\n'-terminated C
1080 * string containing a whitespace-separated list of
1081 * named NFSD listeners;
1082 * return code is the size in bytes of the string
1083 * On error: return code is zero or a negative errno value
1088 * buf: C string containing an unsigned
1089 * integer value representing a bound
1090 * but unconnected socket that is to be
1091 * used as an NFSD listener; listen(3)
1092 * must be called for a SOCK_STREAM
1093 * socket, otherwise it is ignored
1094 * size: non-zero length of C string in @buf
1096 * On success: NFS service is started;
1097 * passed-in buffer filled with a '\n'-terminated C
1098 * string containing a unique alphanumeric name of
1100 * return code is the size in bytes of the string
1101 * On error: return code is a negative errno value
1106 * buf: C string containing a "-" followed
1107 * by an integer value representing a
1108 * previously passed in socket file
1110 * size: non-zero length of C string in @buf
1112 * On success: NFS service no longer listens on that socket;
1113 * passed-in buffer filled with a '\n'-terminated C
1114 * string containing a unique name of the listener;
1115 * return code is the size in bytes of the string
1116 * On error: return code is a negative errno value
1121 * buf: C string containing a transport
1122 * name and an unsigned integer value
1123 * representing the port to listen on,
1124 * separated by whitespace
1125 * size: non-zero length of C string in @buf
1127 * On success: returns zero; NFS service is started
1128 * On error: return code is a negative errno value
1133 * buf: C string containing a "-" followed
1134 * by a transport name and an unsigned
1135 * integer value representing the port
1136 * to listen on, separated by whitespace
1137 * size: non-zero length of C string in @buf
1139 * On success: returns zero; NFS service no longer listens
1141 * On error: return code is a negative errno value
1143 static ssize_t write_ports(struct file *file, char *buf, size_t size)
1147 mutex_lock(&nfsd_mutex);
1148 rv = __write_ports(file, buf, size);
1149 mutex_unlock(&nfsd_mutex);
1154 int nfsd_max_blksize;
1157 * write_maxblksize - Set or report the current NFS blksize
1166 * buf: C string containing an unsigned
1167 * integer value representing the new
1169 * size: non-zero length of C string in @buf
1171 * On success: passed-in buffer filled with '\n'-terminated C string
1172 * containing numeric value of the current NFS blksize
1174 * return code is the size in bytes of the string
1175 * On error: return code is zero or a negative errno value
1177 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
1182 int rv = get_int(&mesg, &bsize);
1185 /* force bsize into allowed range and
1186 * required alignment.
1190 if (bsize > NFSSVC_MAXBLKSIZE)
1191 bsize = NFSSVC_MAXBLKSIZE;
1193 mutex_lock(&nfsd_mutex);
1195 mutex_unlock(&nfsd_mutex);
1198 nfsd_max_blksize = bsize;
1199 mutex_unlock(&nfsd_mutex);
1202 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
1206 #ifdef CONFIG_NFSD_V4
1207 static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size, time_t *time)
1215 rv = get_int(&mesg, &i);
1219 * Some sanity checking. We don't have a reason for
1220 * these particular numbers, but problems with the
1222 * - Too short: the briefest network outage may
1223 * cause clients to lose all their locks. Also,
1224 * the frequent polling may be wasteful.
1225 * - Too long: do you really want reboot recovery
1226 * to take more than an hour? Or to make other
1227 * clients wait an hour before being able to
1228 * revoke a dead client's locks?
1230 if (i < 10 || i > 3600)
1235 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%ld\n", *time);
1238 static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size, time_t *time)
1242 mutex_lock(&nfsd_mutex);
1243 rv = __nfsd4_write_time(file, buf, size, time);
1244 mutex_unlock(&nfsd_mutex);
1249 * write_leasetime - Set or report the current NFSv4 lease time
1258 * buf: C string containing an unsigned
1259 * integer value representing the new
1260 * NFSv4 lease expiry time
1261 * size: non-zero length of C string in @buf
1263 * On success: passed-in buffer filled with '\n'-terminated C
1264 * string containing unsigned integer value of the
1265 * current lease expiry time;
1266 * return code is the size in bytes of the string
1267 * On error: return code is zero or a negative errno value
1269 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
1271 return nfsd4_write_time(file, buf, size, &nfsd4_lease);
1275 * write_gracetime - Set or report current NFSv4 grace period time
1277 * As above, but sets the time of the NFSv4 grace period.
1279 * Note this should never be set to less than the *previous*
1280 * lease-period time, but we don't try to enforce this. (In the common
1281 * case (a new boot), we don't know what the previous lease time was
1284 static ssize_t write_gracetime(struct file *file, char *buf, size_t size)
1286 return nfsd4_write_time(file, buf, size, &nfsd4_grace);
1289 extern char *nfs4_recoverydir(void);
1291 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size)
1300 if (size > PATH_MAX || buf[size-1] != '\n')
1305 len = qword_get(&mesg, recdir, size);
1309 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)