2 * linux/fs/nfsd/nfsctl.c
4 * Syscall interface to knfsd.
6 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
9 #include <linux/module.h>
11 #include <linux/linkage.h>
12 #include <linux/time.h>
13 #include <linux/errno.h>
15 #include <linux/namei.h>
16 #include <linux/fcntl.h>
17 #include <linux/net.h>
19 #include <linux/syscalls.h>
20 #include <linux/unistd.h>
21 #include <linux/slab.h>
22 #include <linux/proc_fs.h>
23 #include <linux/seq_file.h>
24 #include <linux/pagemap.h>
25 #include <linux/init.h>
26 #include <linux/inet.h>
27 #include <linux/string.h>
28 #include <linux/smp_lock.h>
29 #include <linux/ctype.h>
31 #include <linux/nfs.h>
32 #include <linux/nfsd_idmap.h>
33 #include <linux/lockd/bind.h>
34 #include <linux/sunrpc/svc.h>
35 #include <linux/sunrpc/svcsock.h>
36 #include <linux/nfsd/nfsd.h>
37 #include <linux/nfsd/cache.h>
38 #include <linux/nfsd/xdr.h>
39 #include <linux/nfsd/syscall.h>
40 #include <linux/lockd/lockd.h>
42 #include <asm/uaccess.h>
46 * We have a single directory with 9 nodes in it.
68 * The below MUST come last. Otherwise we leave a hole in nfsd_files[]
69 * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
78 * write() for these nodes.
80 static ssize_t write_svc(struct file *file, char *buf, size_t size);
81 static ssize_t write_add(struct file *file, char *buf, size_t size);
82 static ssize_t write_del(struct file *file, char *buf, size_t size);
83 static ssize_t write_export(struct file *file, char *buf, size_t size);
84 static ssize_t write_unexport(struct file *file, char *buf, size_t size);
85 static ssize_t write_getfd(struct file *file, char *buf, size_t size);
86 static ssize_t write_getfs(struct file *file, char *buf, size_t size);
87 static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
88 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size);
89 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size);
90 static ssize_t write_threads(struct file *file, char *buf, size_t size);
91 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
92 static ssize_t write_versions(struct file *file, char *buf, size_t size);
93 static ssize_t write_ports(struct file *file, char *buf, size_t size);
94 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
96 static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
97 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
100 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
101 [NFSD_Svc] = write_svc,
102 [NFSD_Add] = write_add,
103 [NFSD_Del] = write_del,
104 [NFSD_Export] = write_export,
105 [NFSD_Unexport] = write_unexport,
106 [NFSD_Getfd] = write_getfd,
107 [NFSD_Getfs] = write_getfs,
108 [NFSD_Fh] = write_filehandle,
109 [NFSD_FO_UnlockIP] = write_unlock_ip,
110 [NFSD_FO_UnlockFS] = write_unlock_fs,
111 [NFSD_Threads] = write_threads,
112 [NFSD_Pool_Threads] = write_pool_threads,
113 [NFSD_Versions] = write_versions,
114 [NFSD_Ports] = write_ports,
115 [NFSD_MaxBlkSize] = write_maxblksize,
116 #ifdef CONFIG_NFSD_V4
117 [NFSD_Leasetime] = write_leasetime,
118 [NFSD_RecoveryDir] = write_recoverydir,
122 static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
124 ino_t ino = file->f_path.dentry->d_inode->i_ino;
128 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
131 data = simple_transaction_get(file, buf, size);
133 return PTR_ERR(data);
135 rv = write_op[ino](file, data, size);
137 simple_transaction_set(file, rv);
143 static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
145 if (! file->private_data) {
146 /* An attempt to read a transaction file without writing
147 * causes a 0-byte write so that the file can return
150 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
154 return simple_transaction_read(file, buf, size, pos);
157 static const struct file_operations transaction_ops = {
158 .write = nfsctl_transaction_write,
159 .read = nfsctl_transaction_read,
160 .release = simple_transaction_release,
163 static int exports_open(struct inode *inode, struct file *file)
165 return seq_open(file, &nfs_exports_op);
168 static const struct file_operations exports_operations = {
169 .open = exports_open,
172 .release = seq_release,
173 .owner = THIS_MODULE,
176 extern int nfsd_pool_stats_open(struct inode *inode, struct file *file);
178 static struct file_operations pool_stats_operations = {
179 .open = nfsd_pool_stats_open,
182 .release = seq_release,
183 .owner = THIS_MODULE,
186 /*----------------------------------------------------------------------------*/
188 * payload - write methods
192 * write_svc - Start kernel's NFSD server
194 * Deprecated. /proc/fs/nfsd/threads is preferred.
195 * Function remains to support old versions of nfs-utils.
198 * buf: struct nfsctl_svc
199 * svc_port: port number of this
201 * svc_nthreads: number of threads to start
202 * size: size in bytes of passed in nfsctl_svc
204 * On success: returns zero
205 * On error: return code is negative errno value
207 static ssize_t write_svc(struct file *file, char *buf, size_t size)
209 struct nfsctl_svc *data;
210 if (size < sizeof(*data))
212 data = (struct nfsctl_svc*) buf;
213 return nfsd_svc(data->svc_port, data->svc_nthreads);
217 * write_add - Add or modify client entry in auth unix cache
219 * Deprecated. /proc/net/rpc/auth.unix.ip is preferred.
220 * Function remains to support old versions of nfs-utils.
223 * buf: struct nfsctl_client
224 * cl_ident: '\0'-terminated C string
225 * containing domain name
227 * cl_naddr: no. of items in cl_addrlist
228 * cl_addrlist: array of client addresses
229 * cl_fhkeytype: ignored
230 * cl_fhkeylen: ignored
232 * size: size in bytes of passed in nfsctl_client
234 * On success: returns zero
235 * On error: return code is negative errno value
237 * Note: Only AF_INET client addresses are passed in, since
238 * nfsctl_client.cl_addrlist contains only in_addr fields for addresses.
240 static ssize_t write_add(struct file *file, char *buf, size_t size)
242 struct nfsctl_client *data;
243 if (size < sizeof(*data))
245 data = (struct nfsctl_client *)buf;
246 return exp_addclient(data);
250 * write_del - Remove client from auth unix cache
252 * Deprecated. /proc/net/rpc/auth.unix.ip is preferred.
253 * Function remains to support old versions of nfs-utils.
256 * buf: struct nfsctl_client
257 * cl_ident: '\0'-terminated C string
258 * containing domain name
261 * cl_addrlist: ignored
262 * cl_fhkeytype: ignored
263 * cl_fhkeylen: ignored
265 * size: size in bytes of passed in nfsctl_client
267 * On success: returns zero
268 * On error: return code is negative errno value
270 * Note: Only AF_INET client addresses are passed in, since
271 * nfsctl_client.cl_addrlist contains only in_addr fields for addresses.
273 static ssize_t write_del(struct file *file, char *buf, size_t size)
275 struct nfsctl_client *data;
276 if (size < sizeof(*data))
278 data = (struct nfsctl_client *)buf;
279 return exp_delclient(data);
283 * write_export - Export part or all of a local file system
285 * Deprecated. /proc/net/rpc/{nfsd.export,nfsd.fh} are preferred.
286 * Function remains to support old versions of nfs-utils.
289 * buf: struct nfsctl_export
290 * ex_client: '\0'-terminated C string
291 * containing domain name
292 * of client allowed to access
294 * ex_path: '\0'-terminated C string
295 * containing pathname of
296 * directory in local file system
297 * ex_dev: fsid to use for this export
299 * ex_flags: export flags for this export
300 * ex_anon_uid: UID to use for anonymous
302 * ex_anon_gid: GID to use for anonymous
304 * size: size in bytes of passed in nfsctl_export
306 * On success: returns zero
307 * On error: return code is negative errno value
309 static ssize_t write_export(struct file *file, char *buf, size_t size)
311 struct nfsctl_export *data;
312 if (size < sizeof(*data))
314 data = (struct nfsctl_export*)buf;
315 return exp_export(data);
319 * write_unexport - Unexport a previously exported file system
321 * Deprecated. /proc/net/rpc/{nfsd.export,nfsd.fh} are preferred.
322 * Function remains to support old versions of nfs-utils.
325 * buf: struct nfsctl_export
326 * ex_client: '\0'-terminated C string
327 * containing domain name
328 * of client no longer allowed
329 * to access this export
330 * ex_path: '\0'-terminated C string
331 * containing pathname of
332 * directory in local file system
336 * ex_anon_uid: ignored
337 * ex_anon_gid: ignored
338 * size: size in bytes of passed in nfsctl_export
340 * On success: returns zero
341 * On error: return code is negative errno value
343 static ssize_t write_unexport(struct file *file, char *buf, size_t size)
345 struct nfsctl_export *data;
347 if (size < sizeof(*data))
349 data = (struct nfsctl_export*)buf;
350 return exp_unexport(data);
354 * write_getfs - Get a variable-length NFS file handle by path
356 * Deprecated. /proc/fs/nfsd/filehandle is preferred.
357 * Function remains to support old versions of nfs-utils.
360 * buf: struct nfsctl_fsparm
361 * gd_addr: socket address of client
362 * gd_path: '\0'-terminated C string
363 * containing pathname of
364 * directory in local file system
365 * gd_maxlen: maximum size of returned file
367 * size: size in bytes of passed in nfsctl_fsparm
369 * On success: passed-in buffer filled with a knfsd_fh structure
370 * (a variable-length raw NFS file handle);
371 * return code is the size in bytes of the file handle
372 * On error: return code is negative errno value
374 * Note: Only AF_INET client addresses are passed in, since gd_addr
375 * is the same size as a struct sockaddr_in.
377 static ssize_t write_getfs(struct file *file, char *buf, size_t size)
379 struct nfsctl_fsparm *data;
380 struct sockaddr_in *sin;
381 struct auth_domain *clp;
383 struct knfsd_fh *res;
386 if (size < sizeof(*data))
388 data = (struct nfsctl_fsparm*)buf;
389 err = -EPROTONOSUPPORT;
390 if (data->gd_addr.sa_family != AF_INET)
392 sin = (struct sockaddr_in *)&data->gd_addr;
393 if (data->gd_maxlen > NFS3_FHSIZE)
394 data->gd_maxlen = NFS3_FHSIZE;
396 res = (struct knfsd_fh*)buf;
400 ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
402 clp = auth_unix_lookup(&in6);
406 err = exp_rootfh(clp, data->gd_path, res, data->gd_maxlen);
407 auth_domain_put(clp);
411 err = res->fh_size + offsetof(struct knfsd_fh, fh_base);
417 * write_getfd - Get a fixed-length NFS file handle by path (used by mountd)
419 * Deprecated. /proc/fs/nfsd/filehandle is preferred.
420 * Function remains to support old versions of nfs-utils.
423 * buf: struct nfsctl_fdparm
424 * gd_addr: socket address of client
425 * gd_path: '\0'-terminated C string
426 * containing pathname of
427 * directory in local file system
428 * gd_version: fdparm structure version
429 * size: size in bytes of passed in nfsctl_fdparm
431 * On success: passed-in buffer filled with nfsctl_res
432 * (a fixed-length raw NFS file handle);
433 * return code is the size in bytes of the file handle
434 * On error: return code is negative errno value
436 * Note: Only AF_INET client addresses are passed in, since gd_addr
437 * is the same size as a struct sockaddr_in.
439 static ssize_t write_getfd(struct file *file, char *buf, size_t size)
441 struct nfsctl_fdparm *data;
442 struct sockaddr_in *sin;
443 struct auth_domain *clp;
449 if (size < sizeof(*data))
451 data = (struct nfsctl_fdparm*)buf;
452 err = -EPROTONOSUPPORT;
453 if (data->gd_addr.sa_family != AF_INET)
456 if (data->gd_version < 2 || data->gd_version > NFSSVC_MAXVERS)
460 sin = (struct sockaddr_in *)&data->gd_addr;
463 ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
465 clp = auth_unix_lookup(&in6);
469 err = exp_rootfh(clp, data->gd_path, &fh, NFS_FHSIZE);
470 auth_domain_put(clp);
475 memset(res,0, NFS_FHSIZE);
476 memcpy(res, &fh.fh_base, fh.fh_size);
484 * write_unlock_ip - Release all locks used by a client
489 * buf: '\n'-terminated C string containing a
490 * presentation format IPv4 address
491 * size: length of C string in @buf
493 * On success: returns zero if all specified locks were released;
494 * returns one if one or more locks were not released
495 * On error: return code is negative errno value
497 * Note: Only AF_INET client addresses are passed in
499 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
501 struct sockaddr_in sin = {
502 .sin_family = AF_INET,
512 if (buf[size-1] != '\n')
516 if (qword_get(&buf, fo_path, size) < 0)
519 /* get ipv4 address */
520 if (sscanf(fo_path, "%u.%u.%u.%u%c", &b1, &b2, &b3, &b4, &c) != 4)
522 if (b1 > 255 || b2 > 255 || b3 > 255 || b4 > 255)
524 sin.sin_addr.s_addr = htonl((b1 << 24) | (b2 << 16) | (b3 << 8) | b4);
526 return nlmsvc_unlock_all_by_ip((struct sockaddr *)&sin);
530 * write_unlock_fs - Release all locks on a local file system
535 * buf: '\n'-terminated C string containing the
536 * absolute pathname of a local file system
537 * size: length of C string in @buf
539 * On success: returns zero if all specified locks were released;
540 * returns one if one or more locks were not released
541 * On error: return code is negative errno value
543 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
553 if (buf[size-1] != '\n')
557 if (qword_get(&buf, fo_path, size) < 0)
560 error = kern_path(fo_path, 0, &path);
565 * XXX: Needs better sanity checking. Otherwise we could end up
566 * releasing locks on the wrong file system.
569 * 1. Does the path refer to a directory?
570 * 2. Is that directory a mount point, or
571 * 3. Is that directory the root of an exported file system?
573 error = nlmsvc_unlock_all_by_sb(path.mnt->mnt_sb);
580 * write_filehandle - Get a variable-length NFS file handle by path
582 * On input, the buffer contains a '\n'-terminated C string comprised of
583 * three alphanumeric words separated by whitespace. The string may
584 * contain escape sequences.
588 * domain: client domain name
589 * path: export pathname
590 * maxsize: numeric maximum size of
592 * size: length of C string in @buf
594 * On success: passed-in buffer filled with '\n'-terminated C
595 * string containing a ASCII hex text version
596 * of the NFS file handle;
597 * return code is the size in bytes of the string
598 * On error: return code is negative errno value
600 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
603 int uninitialized_var(maxsize);
606 struct auth_domain *dom;
612 if (buf[size-1] != '\n')
617 len = qword_get(&mesg, dname, size);
622 len = qword_get(&mesg, path, size);
626 len = get_int(&mesg, &maxsize);
630 if (maxsize < NFS_FHSIZE)
632 if (maxsize > NFS3_FHSIZE)
633 maxsize = NFS3_FHSIZE;
635 if (qword_get(&mesg, mesg, size)>0)
638 /* we have all the words, they are in buf.. */
639 dom = unix_domain_find(dname);
643 len = exp_rootfh(dom, path, &fh, maxsize);
644 auth_domain_put(dom);
649 len = SIMPLE_TRANSACTION_LIMIT;
650 qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
656 * write_threads - Start NFSD, or report the current number of running threads
662 * On success: passed-in buffer filled with '\n'-terminated C
663 * string numeric value representing the number of
664 * running NFSD threads;
665 * return code is the size in bytes of the string
666 * On error: return code is zero
671 * buf: C string containing an unsigned
672 * integer value representing the
673 * number of NFSD threads to start
674 * size: non-zero length of C string in @buf
676 * On success: NFS service is started;
677 * passed-in buffer filled with '\n'-terminated C
678 * string numeric value representing the number of
679 * running NFSD threads;
680 * return code is the size in bytes of the string
681 * On error: return code is zero or a negative errno value
683 static ssize_t write_threads(struct file *file, char *buf, size_t size)
689 rv = get_int(&mesg, &newthreads);
694 rv = nfsd_svc(NFS_PORT, newthreads);
699 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
704 * write_pool_threads - Set or report the current number of threads per pool
713 * buf: C string containing whitespace-
714 * separated unsigned integer values
715 * representing the number of NFSD
716 * threads to start in each pool
717 * size: non-zero length of C string in @buf
719 * On success: passed-in buffer filled with '\n'-terminated C
720 * string containing integer values representing the
721 * number of NFSD threads in each pool;
722 * return code is the size in bytes of the string
723 * On error: return code is zero or a negative errno value
725 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
727 /* if size > 0, look for an array of number of threads per node
728 * and apply them then write out number of threads per node as reply
737 mutex_lock(&nfsd_mutex);
738 npools = nfsd_nrpools();
741 * NFS is shut down. The admin can start it by
742 * writing to the threads file but NOT the pool_threads
743 * file, sorry. Report zero threads.
745 mutex_unlock(&nfsd_mutex);
750 nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
752 if (nthreads == NULL)
756 for (i = 0; i < npools; i++) {
757 rv = get_int(&mesg, &nthreads[i]);
759 break; /* fewer numbers than pools */
761 goto out_free; /* syntax error */
766 rv = nfsd_set_nrthreads(i, nthreads);
771 rv = nfsd_get_nrthreads(npools, nthreads);
776 size = SIMPLE_TRANSACTION_LIMIT;
777 for (i = 0; i < npools && size > 0; i++) {
778 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
784 mutex_unlock(&nfsd_mutex);
789 mutex_unlock(&nfsd_mutex);
793 static ssize_t __write_versions(struct file *file, char *buf, size_t size)
796 char *vers, *minorp, sign;
797 int len, num, remaining;
804 /* Cannot change versions without updating
805 * nfsd_serv->sv_xdrsize, and reallocing
806 * rq_argp and rq_resp
809 if (buf[size-1] != '\n')
814 len = qword_get(&mesg, vers, size);
815 if (len <= 0) return -EINVAL;
818 if (sign == '+' || sign == '-')
819 num = simple_strtol((vers+1), &minorp, 0);
821 num = simple_strtol(vers, &minorp, 0);
822 if (*minorp == '.') {
825 minor = simple_strtoul(minorp+1, NULL, 0);
828 if (nfsd_minorversion(minor, sign == '-' ?
829 NFSD_CLEAR : NFSD_SET) < 0)
837 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
844 } while ((len = qword_get(&mesg, vers, size)) > 0);
845 /* If all get turned off, turn them back on, as
846 * having no versions is BAD
848 nfsd_reset_versions();
851 /* Now write current state into reply buffer */
854 remaining = SIMPLE_TRANSACTION_LIMIT;
855 for (num=2 ; num <= 4 ; num++)
856 if (nfsd_vers(num, NFSD_AVAIL)) {
857 len = snprintf(buf, remaining, "%s%c%d", sep,
858 nfsd_vers(num, NFSD_TEST)?'+':'-',
868 if (nfsd_vers(4, NFSD_AVAIL))
869 for (minor = 1; minor <= NFSD_SUPPORTED_MINOR_VERSION;
871 len = snprintf(buf, remaining, " %c4.%u",
872 (nfsd_vers(4, NFSD_TEST) &&
873 nfsd_minorversion(minor, NFSD_TEST)) ?
884 len = snprintf(buf, remaining, "\n");
891 * write_versions - Set or report the available NFS protocol versions
897 * On success: passed-in buffer filled with '\n'-terminated C
898 * string containing positive or negative integer
899 * values representing the current status of each
901 * return code is the size in bytes of the string
902 * On error: return code is zero or a negative errno value
907 * buf: C string containing whitespace-
908 * separated positive or negative
909 * integer values representing NFS
910 * protocol versions to enable ("+n")
912 * size: non-zero length of C string in @buf
914 * On success: status of zero or more protocol versions has
915 * been updated; passed-in buffer filled with
916 * '\n'-terminated C string containing positive
917 * or negative integer values representing the
918 * current status of each protocol version;
919 * return code is the size in bytes of the string
920 * On error: return code is zero or a negative errno value
922 static ssize_t write_versions(struct file *file, char *buf, size_t size)
926 mutex_lock(&nfsd_mutex);
927 rv = __write_versions(file, buf, size);
928 mutex_unlock(&nfsd_mutex);
933 * Zero-length write. Return a list of NFSD's current listener
936 static ssize_t __write_ports_names(char *buf)
938 if (nfsd_serv == NULL)
940 return svc_xprt_names(nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
944 * A single 'fd' number was written, in which case it must be for
945 * a socket of a supported family/protocol, and we use it as an
948 static ssize_t __write_ports_addfd(char *buf)
953 err = get_int(&mesg, &fd);
954 if (err != 0 || fd < 0)
957 err = nfsd_create_serv();
965 err = svc_addsock(nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT);
970 /* Decrease the count, but don't shut down the service */
971 nfsd_serv->sv_nrthreads--;
976 * A '-' followed by the 'name' of a socket means we close the socket.
978 static ssize_t __write_ports_delfd(char *buf)
983 toclose = kstrdup(buf + 1, GFP_KERNEL);
987 if (nfsd_serv != NULL)
988 len = svc_sock_names(nfsd_serv, buf,
989 SIMPLE_TRANSACTION_LIMIT, toclose);
998 * A transport listener is added by writing it's transport name and
1001 static ssize_t __write_ports_addxprt(char *buf)
1006 if (sscanf(buf, "%15s %4u", transport, &port) != 2)
1009 if (port < 1 || port > USHORT_MAX)
1012 err = nfsd_create_serv();
1016 err = svc_create_xprt(nfsd_serv, transport,
1017 PF_INET, port, SVC_SOCK_ANONYMOUS);
1019 /* Give a reasonable perror msg for bad transport string */
1021 err = -EPROTONOSUPPORT;
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 > USHORT_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);
1194 if (nfsd_serv && nfsd_serv->sv_nrthreads) {
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 extern time_t nfs4_leasetime(void);
1209 static ssize_t __write_leasetime(struct file *file, char *buf, size_t size)
1211 /* if size > 10 seconds, call
1212 * nfs4_reset_lease() then write out the new lease (seconds) as reply
1220 rv = get_int(&mesg, &lease);
1223 if (lease < 10 || lease > 3600)
1225 nfs4_reset_lease(lease);
1228 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%ld\n",
1233 * write_leasetime - Set or report the current NFSv4 lease time
1242 * buf: C string containing an unsigned
1243 * integer value representing the new
1244 * NFSv4 lease expiry time
1245 * size: non-zero length of C string in @buf
1247 * On success: passed-in buffer filled with '\n'-terminated C
1248 * string containing unsigned integer value of the
1249 * current lease expiry time;
1250 * return code is the size in bytes of the string
1251 * On error: return code is zero or a negative errno value
1253 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
1257 mutex_lock(&nfsd_mutex);
1258 rv = __write_leasetime(file, buf, size);
1259 mutex_unlock(&nfsd_mutex);
1263 extern char *nfs4_recoverydir(void);
1265 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size)
1274 if (size > PATH_MAX || buf[size-1] != '\n')
1279 len = qword_get(&mesg, recdir, size);
1283 status = nfs4_reset_recoverydir(recdir);
1286 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
1287 nfs4_recoverydir());
1291 * write_recoverydir - Set or report the pathname of the recovery directory
1300 * buf: C string containing the pathname
1301 * of the directory on a local file
1302 * system containing permanent NFSv4
1304 * size: non-zero length of C string in @buf
1306 * On success: passed-in buffer filled with '\n'-terminated C string
1307 * containing the current recovery pathname setting;
1308 * return code is the size in bytes of the string
1309 * On error: return code is zero or a negative errno value
1311 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
1315 mutex_lock(&nfsd_mutex);
1316 rv = __write_recoverydir(file, buf, size);
1317 mutex_unlock(&nfsd_mutex);
1323 /*----------------------------------------------------------------------------*/
1325 * populating the filesystem.
1328 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
1330 static struct tree_descr nfsd_files[] = {
1331 [NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR},
1332 [NFSD_Add] = {".add", &transaction_ops, S_IWUSR},
1333 [NFSD_Del] = {".del", &transaction_ops, S_IWUSR},
1334 [NFSD_Export] = {".export", &transaction_ops, S_IWUSR},
1335 [NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR},
1336 [NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR|S_IRUSR},
1337 [NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR|S_IRUSR},
1338 [NFSD_List] = {"exports", &exports_operations, S_IRUGO},
1339 [NFSD_FO_UnlockIP] = {"unlock_ip",
1340 &transaction_ops, S_IWUSR|S_IRUSR},
1341 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1342 &transaction_ops, S_IWUSR|S_IRUSR},
1343 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1344 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1345 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1346 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1347 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1348 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1349 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1350 #ifdef CONFIG_NFSD_V4
1351 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1352 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1356 return simple_fill_super(sb, 0x6e667364, nfsd_files);
1359 static int nfsd_get_sb(struct file_system_type *fs_type,
1360 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
1362 return get_sb_single(fs_type, flags, data, nfsd_fill_super, mnt);
1365 static struct file_system_type nfsd_fs_type = {
1366 .owner = THIS_MODULE,
1368 .get_sb = nfsd_get_sb,
1369 .kill_sb = kill_litter_super,
1372 #ifdef CONFIG_PROC_FS
1373 static int create_proc_exports_entry(void)
1375 struct proc_dir_entry *entry;
1377 entry = proc_mkdir("fs/nfs", NULL);
1380 entry = proc_create("exports", 0, entry, &exports_operations);
1385 #else /* CONFIG_PROC_FS */
1386 static int create_proc_exports_entry(void)
1392 static int __init init_nfsd(void)
1395 printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
1397 retval = nfs4_state_init(); /* nfs4 locking state */
1400 nfsd_stat_init(); /* Statistics */
1401 retval = nfsd_reply_cache_init();
1404 retval = nfsd_export_init();
1406 goto out_free_cache;
1407 nfsd_lockd_init(); /* lockd->nfsd callbacks */
1408 retval = nfsd_idmap_init();
1410 goto out_free_lockd;
1411 retval = create_proc_exports_entry();
1413 goto out_free_idmap;
1414 retval = register_filesystem(&nfsd_fs_type);
1419 remove_proc_entry("fs/nfs/exports", NULL);
1420 remove_proc_entry("fs/nfs", NULL);
1422 nfsd_idmap_shutdown();
1424 nfsd_lockd_shutdown();
1425 nfsd_export_shutdown();
1427 nfsd_reply_cache_shutdown();
1429 nfsd_stat_shutdown();
1434 static void __exit exit_nfsd(void)
1436 nfsd_export_shutdown();
1437 nfsd_reply_cache_shutdown();
1438 remove_proc_entry("fs/nfs/exports", NULL);
1439 remove_proc_entry("fs/nfs", NULL);
1440 nfsd_stat_shutdown();
1441 nfsd_lockd_shutdown();
1442 nfsd_idmap_shutdown();
1444 unregister_filesystem(&nfsd_fs_type);
1447 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1448 MODULE_LICENSE("GPL");
1449 module_init(init_nfsd)
1450 module_exit(exit_nfsd)