Loading...
1/*
2 * Syscall interface to knfsd.
3 *
4 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
5 */
6
7#include <linux/slab.h>
8#include <linux/namei.h>
9#include <linux/ctype.h>
10
11#include <linux/sunrpc/svcsock.h>
12#include <linux/nfsd/syscall.h>
13#include <linux/lockd/lockd.h>
14#include <linux/sunrpc/clnt.h>
15#include <linux/sunrpc/gss_api.h>
16#include <linux/sunrpc/gss_krb5_enctypes.h>
17
18#include "idmap.h"
19#include "nfsd.h"
20#include "cache.h"
21
22/*
23 * We have a single directory with several nodes in it.
24 */
25enum {
26 NFSD_Root = 1,
27 NFSD_List,
28 NFSD_Export_features,
29 NFSD_Fh,
30 NFSD_FO_UnlockIP,
31 NFSD_FO_UnlockFS,
32 NFSD_Threads,
33 NFSD_Pool_Threads,
34 NFSD_Pool_Stats,
35 NFSD_Versions,
36 NFSD_Ports,
37 NFSD_MaxBlkSize,
38 NFSD_SupportedEnctypes,
39 /*
40 * The below MUST come last. Otherwise we leave a hole in nfsd_files[]
41 * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
42 */
43#ifdef CONFIG_NFSD_V4
44 NFSD_Leasetime,
45 NFSD_Gracetime,
46 NFSD_RecoveryDir,
47#endif
48};
49
50/*
51 * write() for these nodes.
52 */
53static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
54static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size);
55static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size);
56static ssize_t write_threads(struct file *file, char *buf, size_t size);
57static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
58static ssize_t write_versions(struct file *file, char *buf, size_t size);
59static ssize_t write_ports(struct file *file, char *buf, size_t size);
60static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
61#ifdef CONFIG_NFSD_V4
62static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
63static ssize_t write_gracetime(struct file *file, char *buf, size_t size);
64static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
65#endif
66
67static ssize_t (*write_op[])(struct file *, char *, size_t) = {
68 [NFSD_Fh] = write_filehandle,
69 [NFSD_FO_UnlockIP] = write_unlock_ip,
70 [NFSD_FO_UnlockFS] = write_unlock_fs,
71 [NFSD_Threads] = write_threads,
72 [NFSD_Pool_Threads] = write_pool_threads,
73 [NFSD_Versions] = write_versions,
74 [NFSD_Ports] = write_ports,
75 [NFSD_MaxBlkSize] = write_maxblksize,
76#ifdef CONFIG_NFSD_V4
77 [NFSD_Leasetime] = write_leasetime,
78 [NFSD_Gracetime] = write_gracetime,
79 [NFSD_RecoveryDir] = write_recoverydir,
80#endif
81};
82
83static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
84{
85 ino_t ino = file->f_path.dentry->d_inode->i_ino;
86 char *data;
87 ssize_t rv;
88
89 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
90 return -EINVAL;
91
92 data = simple_transaction_get(file, buf, size);
93 if (IS_ERR(data))
94 return PTR_ERR(data);
95
96 rv = write_op[ino](file, data, size);
97 if (rv >= 0) {
98 simple_transaction_set(file, rv);
99 rv = size;
100 }
101 return rv;
102}
103
104static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
105{
106 if (! file->private_data) {
107 /* An attempt to read a transaction file without writing
108 * causes a 0-byte write so that the file can return
109 * state information
110 */
111 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
112 if (rv < 0)
113 return rv;
114 }
115 return simple_transaction_read(file, buf, size, pos);
116}
117
118static const struct file_operations transaction_ops = {
119 .write = nfsctl_transaction_write,
120 .read = nfsctl_transaction_read,
121 .release = simple_transaction_release,
122 .llseek = default_llseek,
123};
124
125static int exports_open(struct inode *inode, struct file *file)
126{
127 return seq_open(file, &nfs_exports_op);
128}
129
130static const struct file_operations exports_operations = {
131 .open = exports_open,
132 .read = seq_read,
133 .llseek = seq_lseek,
134 .release = seq_release,
135 .owner = THIS_MODULE,
136};
137
138static int export_features_show(struct seq_file *m, void *v)
139{
140 seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS);
141 return 0;
142}
143
144static int export_features_open(struct inode *inode, struct file *file)
145{
146 return single_open(file, export_features_show, NULL);
147}
148
149static struct file_operations export_features_operations = {
150 .open = export_features_open,
151 .read = seq_read,
152 .llseek = seq_lseek,
153 .release = single_release,
154};
155
156#if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
157static int supported_enctypes_show(struct seq_file *m, void *v)
158{
159 seq_printf(m, KRB5_SUPPORTED_ENCTYPES);
160 return 0;
161}
162
163static int supported_enctypes_open(struct inode *inode, struct file *file)
164{
165 return single_open(file, supported_enctypes_show, NULL);
166}
167
168static struct file_operations supported_enctypes_ops = {
169 .open = supported_enctypes_open,
170 .read = seq_read,
171 .llseek = seq_lseek,
172 .release = single_release,
173};
174#endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
175
176extern int nfsd_pool_stats_open(struct inode *inode, struct file *file);
177extern int nfsd_pool_stats_release(struct inode *inode, struct file *file);
178
179static const struct file_operations pool_stats_operations = {
180 .open = nfsd_pool_stats_open,
181 .read = seq_read,
182 .llseek = seq_lseek,
183 .release = nfsd_pool_stats_release,
184 .owner = THIS_MODULE,
185};
186
187/*----------------------------------------------------------------------------*/
188/*
189 * payload - write methods
190 */
191
192
193/**
194 * write_unlock_ip - Release all locks used by a client
195 *
196 * Experimental.
197 *
198 * Input:
199 * buf: '\n'-terminated C string containing a
200 * presentation format IP address
201 * size: length of C string in @buf
202 * Output:
203 * On success: returns zero if all specified locks were released;
204 * returns one if one or more locks were not released
205 * On error: return code is negative errno value
206 */
207static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
208{
209 struct sockaddr_storage address;
210 struct sockaddr *sap = (struct sockaddr *)&address;
211 size_t salen = sizeof(address);
212 char *fo_path;
213
214 /* sanity check */
215 if (size == 0)
216 return -EINVAL;
217
218 if (buf[size-1] != '\n')
219 return -EINVAL;
220
221 fo_path = buf;
222 if (qword_get(&buf, fo_path, size) < 0)
223 return -EINVAL;
224
225 if (rpc_pton(fo_path, size, sap, salen) == 0)
226 return -EINVAL;
227
228 return nlmsvc_unlock_all_by_ip(sap);
229}
230
231/**
232 * write_unlock_fs - Release all locks on a local file system
233 *
234 * Experimental.
235 *
236 * Input:
237 * buf: '\n'-terminated C string containing the
238 * absolute pathname of a local file system
239 * size: length of C string in @buf
240 * Output:
241 * On success: returns zero if all specified locks were released;
242 * returns one if one or more locks were not released
243 * On error: return code is negative errno value
244 */
245static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
246{
247 struct path path;
248 char *fo_path;
249 int error;
250
251 /* sanity check */
252 if (size == 0)
253 return -EINVAL;
254
255 if (buf[size-1] != '\n')
256 return -EINVAL;
257
258 fo_path = buf;
259 if (qword_get(&buf, fo_path, size) < 0)
260 return -EINVAL;
261
262 error = kern_path(fo_path, 0, &path);
263 if (error)
264 return error;
265
266 /*
267 * XXX: Needs better sanity checking. Otherwise we could end up
268 * releasing locks on the wrong file system.
269 *
270 * For example:
271 * 1. Does the path refer to a directory?
272 * 2. Is that directory a mount point, or
273 * 3. Is that directory the root of an exported file system?
274 */
275 error = nlmsvc_unlock_all_by_sb(path.mnt->mnt_sb);
276
277 path_put(&path);
278 return error;
279}
280
281/**
282 * write_filehandle - Get a variable-length NFS file handle by path
283 *
284 * On input, the buffer contains a '\n'-terminated C string comprised of
285 * three alphanumeric words separated by whitespace. The string may
286 * contain escape sequences.
287 *
288 * Input:
289 * buf:
290 * domain: client domain name
291 * path: export pathname
292 * maxsize: numeric maximum size of
293 * @buf
294 * size: length of C string in @buf
295 * Output:
296 * On success: passed-in buffer filled with '\n'-terminated C
297 * string containing a ASCII hex text version
298 * of the NFS file handle;
299 * return code is the size in bytes of the string
300 * On error: return code is negative errno value
301 */
302static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
303{
304 char *dname, *path;
305 int uninitialized_var(maxsize);
306 char *mesg = buf;
307 int len;
308 struct auth_domain *dom;
309 struct knfsd_fh fh;
310
311 if (size == 0)
312 return -EINVAL;
313
314 if (buf[size-1] != '\n')
315 return -EINVAL;
316 buf[size-1] = 0;
317
318 dname = mesg;
319 len = qword_get(&mesg, dname, size);
320 if (len <= 0)
321 return -EINVAL;
322
323 path = dname+len+1;
324 len = qword_get(&mesg, path, size);
325 if (len <= 0)
326 return -EINVAL;
327
328 len = get_int(&mesg, &maxsize);
329 if (len)
330 return len;
331
332 if (maxsize < NFS_FHSIZE)
333 return -EINVAL;
334 if (maxsize > NFS3_FHSIZE)
335 maxsize = NFS3_FHSIZE;
336
337 if (qword_get(&mesg, mesg, size)>0)
338 return -EINVAL;
339
340 /* we have all the words, they are in buf.. */
341 dom = unix_domain_find(dname);
342 if (!dom)
343 return -ENOMEM;
344
345 len = exp_rootfh(dom, path, &fh, maxsize);
346 auth_domain_put(dom);
347 if (len)
348 return len;
349
350 mesg = buf;
351 len = SIMPLE_TRANSACTION_LIMIT;
352 qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
353 mesg[-1] = '\n';
354 return mesg - buf;
355}
356
357/**
358 * write_threads - Start NFSD, or report the current number of running threads
359 *
360 * Input:
361 * buf: ignored
362 * size: zero
363 * Output:
364 * On success: passed-in buffer filled with '\n'-terminated C
365 * string numeric value representing the number of
366 * running NFSD threads;
367 * return code is the size in bytes of the string
368 * On error: return code is zero
369 *
370 * OR
371 *
372 * Input:
373 * buf: C string containing an unsigned
374 * integer value representing the
375 * number of NFSD threads to start
376 * size: non-zero length of C string in @buf
377 * Output:
378 * On success: NFS service is started;
379 * passed-in buffer filled with '\n'-terminated C
380 * string numeric value representing the number of
381 * running NFSD threads;
382 * return code is the size in bytes of the string
383 * On error: return code is zero or a negative errno value
384 */
385static ssize_t write_threads(struct file *file, char *buf, size_t size)
386{
387 char *mesg = buf;
388 int rv;
389 if (size > 0) {
390 int newthreads;
391 rv = get_int(&mesg, &newthreads);
392 if (rv)
393 return rv;
394 if (newthreads < 0)
395 return -EINVAL;
396 rv = nfsd_svc(NFS_PORT, newthreads);
397 if (rv < 0)
398 return rv;
399 } else
400 rv = nfsd_nrthreads();
401
402 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
403}
404
405/**
406 * write_pool_threads - Set or report the current number of threads per pool
407 *
408 * Input:
409 * buf: ignored
410 * size: zero
411 *
412 * OR
413 *
414 * Input:
415 * buf: C string containing whitespace-
416 * separated unsigned integer values
417 * representing the number of NFSD
418 * threads to start in each pool
419 * size: non-zero length of C string in @buf
420 * Output:
421 * On success: passed-in buffer filled with '\n'-terminated C
422 * string containing integer values representing the
423 * number of NFSD threads in each pool;
424 * return code is the size in bytes of the string
425 * On error: return code is zero or a negative errno value
426 */
427static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
428{
429 /* if size > 0, look for an array of number of threads per node
430 * and apply them then write out number of threads per node as reply
431 */
432 char *mesg = buf;
433 int i;
434 int rv;
435 int len;
436 int npools;
437 int *nthreads;
438
439 mutex_lock(&nfsd_mutex);
440 npools = nfsd_nrpools();
441 if (npools == 0) {
442 /*
443 * NFS is shut down. The admin can start it by
444 * writing to the threads file but NOT the pool_threads
445 * file, sorry. Report zero threads.
446 */
447 mutex_unlock(&nfsd_mutex);
448 strcpy(buf, "0\n");
449 return strlen(buf);
450 }
451
452 nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
453 rv = -ENOMEM;
454 if (nthreads == NULL)
455 goto out_free;
456
457 if (size > 0) {
458 for (i = 0; i < npools; i++) {
459 rv = get_int(&mesg, &nthreads[i]);
460 if (rv == -ENOENT)
461 break; /* fewer numbers than pools */
462 if (rv)
463 goto out_free; /* syntax error */
464 rv = -EINVAL;
465 if (nthreads[i] < 0)
466 goto out_free;
467 }
468 rv = nfsd_set_nrthreads(i, nthreads);
469 if (rv)
470 goto out_free;
471 }
472
473 rv = nfsd_get_nrthreads(npools, nthreads);
474 if (rv)
475 goto out_free;
476
477 mesg = buf;
478 size = SIMPLE_TRANSACTION_LIMIT;
479 for (i = 0; i < npools && size > 0; i++) {
480 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
481 len = strlen(mesg);
482 size -= len;
483 mesg += len;
484 }
485 rv = mesg - buf;
486out_free:
487 kfree(nthreads);
488 mutex_unlock(&nfsd_mutex);
489 return rv;
490}
491
492static ssize_t __write_versions(struct file *file, char *buf, size_t size)
493{
494 char *mesg = buf;
495 char *vers, *minorp, sign;
496 int len, num, remaining;
497 unsigned minor;
498 ssize_t tlen = 0;
499 char *sep;
500
501 if (size>0) {
502 if (nfsd_serv)
503 /* Cannot change versions without updating
504 * nfsd_serv->sv_xdrsize, and reallocing
505 * rq_argp and rq_resp
506 */
507 return -EBUSY;
508 if (buf[size-1] != '\n')
509 return -EINVAL;
510 buf[size-1] = 0;
511
512 vers = mesg;
513 len = qword_get(&mesg, vers, size);
514 if (len <= 0) return -EINVAL;
515 do {
516 sign = *vers;
517 if (sign == '+' || sign == '-')
518 num = simple_strtol((vers+1), &minorp, 0);
519 else
520 num = simple_strtol(vers, &minorp, 0);
521 if (*minorp == '.') {
522 if (num < 4)
523 return -EINVAL;
524 minor = simple_strtoul(minorp+1, NULL, 0);
525 if (minor == 0)
526 return -EINVAL;
527 if (nfsd_minorversion(minor, sign == '-' ?
528 NFSD_CLEAR : NFSD_SET) < 0)
529 return -EINVAL;
530 goto next;
531 }
532 switch(num) {
533 case 2:
534 case 3:
535 case 4:
536 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
537 break;
538 default:
539 return -EINVAL;
540 }
541 next:
542 vers += len + 1;
543 } while ((len = qword_get(&mesg, vers, size)) > 0);
544 /* If all get turned off, turn them back on, as
545 * having no versions is BAD
546 */
547 nfsd_reset_versions();
548 }
549
550 /* Now write current state into reply buffer */
551 len = 0;
552 sep = "";
553 remaining = SIMPLE_TRANSACTION_LIMIT;
554 for (num=2 ; num <= 4 ; num++)
555 if (nfsd_vers(num, NFSD_AVAIL)) {
556 len = snprintf(buf, remaining, "%s%c%d", sep,
557 nfsd_vers(num, NFSD_TEST)?'+':'-',
558 num);
559 sep = " ";
560
561 if (len > remaining)
562 break;
563 remaining -= len;
564 buf += len;
565 tlen += len;
566 }
567 if (nfsd_vers(4, NFSD_AVAIL))
568 for (minor = 1; minor <= NFSD_SUPPORTED_MINOR_VERSION;
569 minor++) {
570 len = snprintf(buf, remaining, " %c4.%u",
571 (nfsd_vers(4, NFSD_TEST) &&
572 nfsd_minorversion(minor, NFSD_TEST)) ?
573 '+' : '-',
574 minor);
575
576 if (len > remaining)
577 break;
578 remaining -= len;
579 buf += len;
580 tlen += len;
581 }
582
583 len = snprintf(buf, remaining, "\n");
584 if (len > remaining)
585 return -EINVAL;
586 return tlen + len;
587}
588
589/**
590 * write_versions - Set or report the available NFS protocol versions
591 *
592 * Input:
593 * buf: ignored
594 * size: zero
595 * Output:
596 * On success: passed-in buffer filled with '\n'-terminated C
597 * string containing positive or negative integer
598 * values representing the current status of each
599 * protocol version;
600 * return code is the size in bytes of the string
601 * On error: return code is zero or a negative errno value
602 *
603 * OR
604 *
605 * Input:
606 * buf: C string containing whitespace-
607 * separated positive or negative
608 * integer values representing NFS
609 * protocol versions to enable ("+n")
610 * or disable ("-n")
611 * size: non-zero length of C string in @buf
612 * Output:
613 * On success: status of zero or more protocol versions has
614 * been updated; passed-in buffer filled with
615 * '\n'-terminated C string containing positive
616 * or negative integer values representing the
617 * current status of each protocol version;
618 * return code is the size in bytes of the string
619 * On error: return code is zero or a negative errno value
620 */
621static ssize_t write_versions(struct file *file, char *buf, size_t size)
622{
623 ssize_t rv;
624
625 mutex_lock(&nfsd_mutex);
626 rv = __write_versions(file, buf, size);
627 mutex_unlock(&nfsd_mutex);
628 return rv;
629}
630
631/*
632 * Zero-length write. Return a list of NFSD's current listener
633 * transports.
634 */
635static ssize_t __write_ports_names(char *buf)
636{
637 if (nfsd_serv == NULL)
638 return 0;
639 return svc_xprt_names(nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
640}
641
642/*
643 * A single 'fd' number was written, in which case it must be for
644 * a socket of a supported family/protocol, and we use it as an
645 * nfsd listener.
646 */
647static ssize_t __write_ports_addfd(char *buf)
648{
649 char *mesg = buf;
650 int fd, err;
651
652 err = get_int(&mesg, &fd);
653 if (err != 0 || fd < 0)
654 return -EINVAL;
655
656 err = nfsd_create_serv();
657 if (err != 0)
658 return err;
659
660 err = svc_addsock(nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT);
661 if (err < 0) {
662 svc_destroy(nfsd_serv);
663 return err;
664 }
665
666 /* Decrease the count, but don't shut down the service */
667 nfsd_serv->sv_nrthreads--;
668 return err;
669}
670
671/*
672 * A '-' followed by the 'name' of a socket means we close the socket.
673 */
674static ssize_t __write_ports_delfd(char *buf)
675{
676 char *toclose;
677 int len = 0;
678
679 toclose = kstrdup(buf + 1, GFP_KERNEL);
680 if (toclose == NULL)
681 return -ENOMEM;
682
683 if (nfsd_serv != NULL)
684 len = svc_sock_names(nfsd_serv, buf,
685 SIMPLE_TRANSACTION_LIMIT, toclose);
686 kfree(toclose);
687 return len;
688}
689
690/*
691 * A transport listener is added by writing it's transport name and
692 * a port number.
693 */
694static ssize_t __write_ports_addxprt(char *buf)
695{
696 char transport[16];
697 struct svc_xprt *xprt;
698 int port, err;
699
700 if (sscanf(buf, "%15s %4u", transport, &port) != 2)
701 return -EINVAL;
702
703 if (port < 1 || port > USHRT_MAX)
704 return -EINVAL;
705
706 err = nfsd_create_serv();
707 if (err != 0)
708 return err;
709
710 err = svc_create_xprt(nfsd_serv, transport, &init_net,
711 PF_INET, port, SVC_SOCK_ANONYMOUS);
712 if (err < 0)
713 goto out_err;
714
715 err = svc_create_xprt(nfsd_serv, transport, &init_net,
716 PF_INET6, port, SVC_SOCK_ANONYMOUS);
717 if (err < 0 && err != -EAFNOSUPPORT)
718 goto out_close;
719
720 /* Decrease the count, but don't shut down the service */
721 nfsd_serv->sv_nrthreads--;
722 return 0;
723out_close:
724 xprt = svc_find_xprt(nfsd_serv, transport, PF_INET, port);
725 if (xprt != NULL) {
726 svc_close_xprt(xprt);
727 svc_xprt_put(xprt);
728 }
729out_err:
730 svc_destroy(nfsd_serv);
731 return err;
732}
733
734/*
735 * A transport listener is removed by writing a "-", it's transport
736 * name, and it's port number.
737 */
738static ssize_t __write_ports_delxprt(char *buf)
739{
740 struct svc_xprt *xprt;
741 char transport[16];
742 int port;
743
744 if (sscanf(&buf[1], "%15s %4u", transport, &port) != 2)
745 return -EINVAL;
746
747 if (port < 1 || port > USHRT_MAX || nfsd_serv == NULL)
748 return -EINVAL;
749
750 xprt = svc_find_xprt(nfsd_serv, transport, AF_UNSPEC, port);
751 if (xprt == NULL)
752 return -ENOTCONN;
753
754 svc_close_xprt(xprt);
755 svc_xprt_put(xprt);
756 return 0;
757}
758
759static ssize_t __write_ports(struct file *file, char *buf, size_t size)
760{
761 if (size == 0)
762 return __write_ports_names(buf);
763
764 if (isdigit(buf[0]))
765 return __write_ports_addfd(buf);
766
767 if (buf[0] == '-' && isdigit(buf[1]))
768 return __write_ports_delfd(buf);
769
770 if (isalpha(buf[0]))
771 return __write_ports_addxprt(buf);
772
773 if (buf[0] == '-' && isalpha(buf[1]))
774 return __write_ports_delxprt(buf);
775
776 return -EINVAL;
777}
778
779/**
780 * write_ports - Pass a socket file descriptor or transport name to listen on
781 *
782 * Input:
783 * buf: ignored
784 * size: zero
785 * Output:
786 * On success: passed-in buffer filled with a '\n'-terminated C
787 * string containing a whitespace-separated list of
788 * named NFSD listeners;
789 * return code is the size in bytes of the string
790 * On error: return code is zero or a negative errno value
791 *
792 * OR
793 *
794 * Input:
795 * buf: C string containing an unsigned
796 * integer value representing a bound
797 * but unconnected socket that is to be
798 * used as an NFSD listener; listen(3)
799 * must be called for a SOCK_STREAM
800 * socket, otherwise it is ignored
801 * size: non-zero length of C string in @buf
802 * Output:
803 * On success: NFS service is started;
804 * passed-in buffer filled with a '\n'-terminated C
805 * string containing a unique alphanumeric name of
806 * the listener;
807 * return code is the size in bytes of the string
808 * On error: return code is a negative errno value
809 *
810 * OR
811 *
812 * Input:
813 * buf: C string containing a "-" followed
814 * by an integer value representing a
815 * previously passed in socket file
816 * descriptor
817 * size: non-zero length of C string in @buf
818 * Output:
819 * On success: NFS service no longer listens on that socket;
820 * passed-in buffer filled with a '\n'-terminated C
821 * string containing a unique name of the listener;
822 * return code is the size in bytes of the string
823 * On error: return code is a negative errno value
824 *
825 * OR
826 *
827 * Input:
828 * buf: C string containing a transport
829 * name and an unsigned integer value
830 * representing the port to listen on,
831 * separated by whitespace
832 * size: non-zero length of C string in @buf
833 * Output:
834 * On success: returns zero; NFS service is started
835 * On error: return code is a negative errno value
836 *
837 * OR
838 *
839 * Input:
840 * buf: C string containing a "-" followed
841 * by a transport name and an unsigned
842 * integer value representing the port
843 * to listen on, separated by whitespace
844 * size: non-zero length of C string in @buf
845 * Output:
846 * On success: returns zero; NFS service no longer listens
847 * on that transport
848 * On error: return code is a negative errno value
849 */
850static ssize_t write_ports(struct file *file, char *buf, size_t size)
851{
852 ssize_t rv;
853
854 mutex_lock(&nfsd_mutex);
855 rv = __write_ports(file, buf, size);
856 mutex_unlock(&nfsd_mutex);
857 return rv;
858}
859
860
861int nfsd_max_blksize;
862
863/**
864 * write_maxblksize - Set or report the current NFS blksize
865 *
866 * Input:
867 * buf: ignored
868 * size: zero
869 *
870 * OR
871 *
872 * Input:
873 * buf: C string containing an unsigned
874 * integer value representing the new
875 * NFS blksize
876 * size: non-zero length of C string in @buf
877 * Output:
878 * On success: passed-in buffer filled with '\n'-terminated C string
879 * containing numeric value of the current NFS blksize
880 * setting;
881 * return code is the size in bytes of the string
882 * On error: return code is zero or a negative errno value
883 */
884static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
885{
886 char *mesg = buf;
887 if (size > 0) {
888 int bsize;
889 int rv = get_int(&mesg, &bsize);
890 if (rv)
891 return rv;
892 /* force bsize into allowed range and
893 * required alignment.
894 */
895 if (bsize < 1024)
896 bsize = 1024;
897 if (bsize > NFSSVC_MAXBLKSIZE)
898 bsize = NFSSVC_MAXBLKSIZE;
899 bsize &= ~(1024-1);
900 mutex_lock(&nfsd_mutex);
901 if (nfsd_serv) {
902 mutex_unlock(&nfsd_mutex);
903 return -EBUSY;
904 }
905 nfsd_max_blksize = bsize;
906 mutex_unlock(&nfsd_mutex);
907 }
908
909 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
910 nfsd_max_blksize);
911}
912
913#ifdef CONFIG_NFSD_V4
914static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size, time_t *time)
915{
916 char *mesg = buf;
917 int rv, i;
918
919 if (size > 0) {
920 if (nfsd_serv)
921 return -EBUSY;
922 rv = get_int(&mesg, &i);
923 if (rv)
924 return rv;
925 /*
926 * Some sanity checking. We don't have a reason for
927 * these particular numbers, but problems with the
928 * extremes are:
929 * - Too short: the briefest network outage may
930 * cause clients to lose all their locks. Also,
931 * the frequent polling may be wasteful.
932 * - Too long: do you really want reboot recovery
933 * to take more than an hour? Or to make other
934 * clients wait an hour before being able to
935 * revoke a dead client's locks?
936 */
937 if (i < 10 || i > 3600)
938 return -EINVAL;
939 *time = i;
940 }
941
942 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%ld\n", *time);
943}
944
945static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size, time_t *time)
946{
947 ssize_t rv;
948
949 mutex_lock(&nfsd_mutex);
950 rv = __nfsd4_write_time(file, buf, size, time);
951 mutex_unlock(&nfsd_mutex);
952 return rv;
953}
954
955/**
956 * write_leasetime - Set or report the current NFSv4 lease time
957 *
958 * Input:
959 * buf: ignored
960 * size: zero
961 *
962 * OR
963 *
964 * Input:
965 * buf: C string containing an unsigned
966 * integer value representing the new
967 * NFSv4 lease expiry time
968 * size: non-zero length of C string in @buf
969 * Output:
970 * On success: passed-in buffer filled with '\n'-terminated C
971 * string containing unsigned integer value of the
972 * current lease expiry time;
973 * return code is the size in bytes of the string
974 * On error: return code is zero or a negative errno value
975 */
976static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
977{
978 return nfsd4_write_time(file, buf, size, &nfsd4_lease);
979}
980
981/**
982 * write_gracetime - Set or report current NFSv4 grace period time
983 *
984 * As above, but sets the time of the NFSv4 grace period.
985 *
986 * Note this should never be set to less than the *previous*
987 * lease-period time, but we don't try to enforce this. (In the common
988 * case (a new boot), we don't know what the previous lease time was
989 * anyway.)
990 */
991static ssize_t write_gracetime(struct file *file, char *buf, size_t size)
992{
993 return nfsd4_write_time(file, buf, size, &nfsd4_grace);
994}
995
996extern char *nfs4_recoverydir(void);
997
998static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size)
999{
1000 char *mesg = buf;
1001 char *recdir;
1002 int len, status;
1003
1004 if (size > 0) {
1005 if (nfsd_serv)
1006 return -EBUSY;
1007 if (size > PATH_MAX || buf[size-1] != '\n')
1008 return -EINVAL;
1009 buf[size-1] = 0;
1010
1011 recdir = mesg;
1012 len = qword_get(&mesg, recdir, size);
1013 if (len <= 0)
1014 return -EINVAL;
1015
1016 status = nfs4_reset_recoverydir(recdir);
1017 if (status)
1018 return status;
1019 }
1020
1021 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
1022 nfs4_recoverydir());
1023}
1024
1025/**
1026 * write_recoverydir - Set or report the pathname of the recovery directory
1027 *
1028 * Input:
1029 * buf: ignored
1030 * size: zero
1031 *
1032 * OR
1033 *
1034 * Input:
1035 * buf: C string containing the pathname
1036 * of the directory on a local file
1037 * system containing permanent NFSv4
1038 * recovery data
1039 * size: non-zero length of C string in @buf
1040 * Output:
1041 * On success: passed-in buffer filled with '\n'-terminated C string
1042 * containing the current recovery pathname setting;
1043 * return code is the size in bytes of the string
1044 * On error: return code is zero or a negative errno value
1045 */
1046static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
1047{
1048 ssize_t rv;
1049
1050 mutex_lock(&nfsd_mutex);
1051 rv = __write_recoverydir(file, buf, size);
1052 mutex_unlock(&nfsd_mutex);
1053 return rv;
1054}
1055
1056#endif
1057
1058/*----------------------------------------------------------------------------*/
1059/*
1060 * populating the filesystem.
1061 */
1062
1063static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
1064{
1065 static struct tree_descr nfsd_files[] = {
1066 [NFSD_List] = {"exports", &exports_operations, S_IRUGO},
1067 [NFSD_Export_features] = {"export_features",
1068 &export_features_operations, S_IRUGO},
1069 [NFSD_FO_UnlockIP] = {"unlock_ip",
1070 &transaction_ops, S_IWUSR|S_IRUSR},
1071 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1072 &transaction_ops, S_IWUSR|S_IRUSR},
1073 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1074 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1075 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1076 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1077 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1078 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1079 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1080#if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
1081 [NFSD_SupportedEnctypes] = {"supported_krb5_enctypes", &supported_enctypes_ops, S_IRUGO},
1082#endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
1083#ifdef CONFIG_NFSD_V4
1084 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1085 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
1086 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1087#endif
1088 /* last one */ {""}
1089 };
1090 return simple_fill_super(sb, 0x6e667364, nfsd_files);
1091}
1092
1093static struct dentry *nfsd_mount(struct file_system_type *fs_type,
1094 int flags, const char *dev_name, void *data)
1095{
1096 return mount_single(fs_type, flags, data, nfsd_fill_super);
1097}
1098
1099static struct file_system_type nfsd_fs_type = {
1100 .owner = THIS_MODULE,
1101 .name = "nfsd",
1102 .mount = nfsd_mount,
1103 .kill_sb = kill_litter_super,
1104};
1105
1106#ifdef CONFIG_PROC_FS
1107static int create_proc_exports_entry(void)
1108{
1109 struct proc_dir_entry *entry;
1110
1111 entry = proc_mkdir("fs/nfs", NULL);
1112 if (!entry)
1113 return -ENOMEM;
1114 entry = proc_create("exports", 0, entry, &exports_operations);
1115 if (!entry)
1116 return -ENOMEM;
1117 return 0;
1118}
1119#else /* CONFIG_PROC_FS */
1120static int create_proc_exports_entry(void)
1121{
1122 return 0;
1123}
1124#endif
1125
1126static int __init init_nfsd(void)
1127{
1128 int retval;
1129 printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
1130
1131 retval = nfs4_state_init(); /* nfs4 locking state */
1132 if (retval)
1133 return retval;
1134 nfsd_stat_init(); /* Statistics */
1135 retval = nfsd_reply_cache_init();
1136 if (retval)
1137 goto out_free_stat;
1138 retval = nfsd_export_init();
1139 if (retval)
1140 goto out_free_cache;
1141 nfsd_lockd_init(); /* lockd->nfsd callbacks */
1142 retval = nfsd_idmap_init();
1143 if (retval)
1144 goto out_free_lockd;
1145 retval = create_proc_exports_entry();
1146 if (retval)
1147 goto out_free_idmap;
1148 retval = register_filesystem(&nfsd_fs_type);
1149 if (retval)
1150 goto out_free_all;
1151 return 0;
1152out_free_all:
1153 remove_proc_entry("fs/nfs/exports", NULL);
1154 remove_proc_entry("fs/nfs", NULL);
1155out_free_idmap:
1156 nfsd_idmap_shutdown();
1157out_free_lockd:
1158 nfsd_lockd_shutdown();
1159 nfsd_export_shutdown();
1160out_free_cache:
1161 nfsd_reply_cache_shutdown();
1162out_free_stat:
1163 nfsd_stat_shutdown();
1164 nfsd4_free_slabs();
1165 return retval;
1166}
1167
1168static void __exit exit_nfsd(void)
1169{
1170 nfsd_export_shutdown();
1171 nfsd_reply_cache_shutdown();
1172 remove_proc_entry("fs/nfs/exports", NULL);
1173 remove_proc_entry("fs/nfs", NULL);
1174 nfsd_stat_shutdown();
1175 nfsd_lockd_shutdown();
1176 nfsd_idmap_shutdown();
1177 nfsd4_free_slabs();
1178 unregister_filesystem(&nfsd_fs_type);
1179}
1180
1181MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1182MODULE_LICENSE("GPL");
1183module_init(init_nfsd)
1184module_exit(exit_nfsd)
1/*
2 * Syscall interface to knfsd.
3 *
4 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
5 */
6
7#include <linux/slab.h>
8#include <linux/namei.h>
9#include <linux/ctype.h>
10
11#include <linux/sunrpc/svcsock.h>
12#include <linux/lockd/lockd.h>
13#include <linux/sunrpc/addr.h>
14#include <linux/sunrpc/gss_api.h>
15#include <linux/sunrpc/gss_krb5_enctypes.h>
16#include <linux/sunrpc/rpc_pipe_fs.h>
17#include <linux/module.h>
18
19#include "idmap.h"
20#include "nfsd.h"
21#include "cache.h"
22#include "state.h"
23#include "netns.h"
24#include "pnfs.h"
25
26/*
27 * We have a single directory with several nodes in it.
28 */
29enum {
30 NFSD_Root = 1,
31 NFSD_List,
32 NFSD_Export_features,
33 NFSD_Fh,
34 NFSD_FO_UnlockIP,
35 NFSD_FO_UnlockFS,
36 NFSD_Threads,
37 NFSD_Pool_Threads,
38 NFSD_Pool_Stats,
39 NFSD_Reply_Cache_Stats,
40 NFSD_Versions,
41 NFSD_Ports,
42 NFSD_MaxBlkSize,
43 NFSD_MaxConnections,
44 NFSD_SupportedEnctypes,
45 /*
46 * The below MUST come last. Otherwise we leave a hole in nfsd_files[]
47 * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
48 */
49#ifdef CONFIG_NFSD_V4
50 NFSD_Leasetime,
51 NFSD_Gracetime,
52 NFSD_RecoveryDir,
53 NFSD_V4EndGrace,
54#endif
55};
56
57/*
58 * write() for these nodes.
59 */
60static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
61static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size);
62static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size);
63static ssize_t write_threads(struct file *file, char *buf, size_t size);
64static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
65static ssize_t write_versions(struct file *file, char *buf, size_t size);
66static ssize_t write_ports(struct file *file, char *buf, size_t size);
67static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
68static ssize_t write_maxconn(struct file *file, char *buf, size_t size);
69#ifdef CONFIG_NFSD_V4
70static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
71static ssize_t write_gracetime(struct file *file, char *buf, size_t size);
72static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
73static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size);
74#endif
75
76static ssize_t (*write_op[])(struct file *, char *, size_t) = {
77 [NFSD_Fh] = write_filehandle,
78 [NFSD_FO_UnlockIP] = write_unlock_ip,
79 [NFSD_FO_UnlockFS] = write_unlock_fs,
80 [NFSD_Threads] = write_threads,
81 [NFSD_Pool_Threads] = write_pool_threads,
82 [NFSD_Versions] = write_versions,
83 [NFSD_Ports] = write_ports,
84 [NFSD_MaxBlkSize] = write_maxblksize,
85 [NFSD_MaxConnections] = write_maxconn,
86#ifdef CONFIG_NFSD_V4
87 [NFSD_Leasetime] = write_leasetime,
88 [NFSD_Gracetime] = write_gracetime,
89 [NFSD_RecoveryDir] = write_recoverydir,
90 [NFSD_V4EndGrace] = write_v4_end_grace,
91#endif
92};
93
94static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
95{
96 ino_t ino = file_inode(file)->i_ino;
97 char *data;
98 ssize_t rv;
99
100 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
101 return -EINVAL;
102
103 data = simple_transaction_get(file, buf, size);
104 if (IS_ERR(data))
105 return PTR_ERR(data);
106
107 rv = write_op[ino](file, data, size);
108 if (rv >= 0) {
109 simple_transaction_set(file, rv);
110 rv = size;
111 }
112 return rv;
113}
114
115static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
116{
117 if (! file->private_data) {
118 /* An attempt to read a transaction file without writing
119 * causes a 0-byte write so that the file can return
120 * state information
121 */
122 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
123 if (rv < 0)
124 return rv;
125 }
126 return simple_transaction_read(file, buf, size, pos);
127}
128
129static const struct file_operations transaction_ops = {
130 .write = nfsctl_transaction_write,
131 .read = nfsctl_transaction_read,
132 .release = simple_transaction_release,
133 .llseek = default_llseek,
134};
135
136static int exports_net_open(struct net *net, struct file *file)
137{
138 int err;
139 struct seq_file *seq;
140 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
141
142 err = seq_open(file, &nfs_exports_op);
143 if (err)
144 return err;
145
146 seq = file->private_data;
147 seq->private = nn->svc_export_cache;
148 return 0;
149}
150
151static int exports_proc_open(struct inode *inode, struct file *file)
152{
153 return exports_net_open(current->nsproxy->net_ns, file);
154}
155
156static const struct file_operations exports_proc_operations = {
157 .open = exports_proc_open,
158 .read = seq_read,
159 .llseek = seq_lseek,
160 .release = seq_release,
161};
162
163static int exports_nfsd_open(struct inode *inode, struct file *file)
164{
165 return exports_net_open(inode->i_sb->s_fs_info, file);
166}
167
168static const struct file_operations exports_nfsd_operations = {
169 .open = exports_nfsd_open,
170 .read = seq_read,
171 .llseek = seq_lseek,
172 .release = seq_release,
173};
174
175static int export_features_show(struct seq_file *m, void *v)
176{
177 seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS);
178 return 0;
179}
180
181static int export_features_open(struct inode *inode, struct file *file)
182{
183 return single_open(file, export_features_show, NULL);
184}
185
186static const struct file_operations export_features_operations = {
187 .open = export_features_open,
188 .read = seq_read,
189 .llseek = seq_lseek,
190 .release = single_release,
191};
192
193#if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
194static int supported_enctypes_show(struct seq_file *m, void *v)
195{
196 seq_printf(m, KRB5_SUPPORTED_ENCTYPES);
197 return 0;
198}
199
200static int supported_enctypes_open(struct inode *inode, struct file *file)
201{
202 return single_open(file, supported_enctypes_show, NULL);
203}
204
205static const struct file_operations supported_enctypes_ops = {
206 .open = supported_enctypes_open,
207 .read = seq_read,
208 .llseek = seq_lseek,
209 .release = single_release,
210};
211#endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
212
213static const struct file_operations pool_stats_operations = {
214 .open = nfsd_pool_stats_open,
215 .read = seq_read,
216 .llseek = seq_lseek,
217 .release = nfsd_pool_stats_release,
218};
219
220static const struct file_operations reply_cache_stats_operations = {
221 .open = nfsd_reply_cache_stats_open,
222 .read = seq_read,
223 .llseek = seq_lseek,
224 .release = single_release,
225};
226
227/*----------------------------------------------------------------------------*/
228/*
229 * payload - write methods
230 */
231
232static inline struct net *netns(struct file *file)
233{
234 return file_inode(file)->i_sb->s_fs_info;
235}
236
237/**
238 * write_unlock_ip - Release all locks used by a client
239 *
240 * Experimental.
241 *
242 * Input:
243 * buf: '\n'-terminated C string containing a
244 * presentation format IP address
245 * size: length of C string in @buf
246 * Output:
247 * On success: returns zero if all specified locks were released;
248 * returns one if one or more locks were not released
249 * On error: return code is negative errno value
250 */
251static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
252{
253 struct sockaddr_storage address;
254 struct sockaddr *sap = (struct sockaddr *)&address;
255 size_t salen = sizeof(address);
256 char *fo_path;
257 struct net *net = netns(file);
258
259 /* sanity check */
260 if (size == 0)
261 return -EINVAL;
262
263 if (buf[size-1] != '\n')
264 return -EINVAL;
265
266 fo_path = buf;
267 if (qword_get(&buf, fo_path, size) < 0)
268 return -EINVAL;
269
270 if (rpc_pton(net, fo_path, size, sap, salen) == 0)
271 return -EINVAL;
272
273 return nlmsvc_unlock_all_by_ip(sap);
274}
275
276/**
277 * write_unlock_fs - Release all locks on a local file system
278 *
279 * Experimental.
280 *
281 * Input:
282 * buf: '\n'-terminated C string containing the
283 * absolute pathname of a local file system
284 * size: length of C string in @buf
285 * Output:
286 * On success: returns zero if all specified locks were released;
287 * returns one if one or more locks were not released
288 * On error: return code is negative errno value
289 */
290static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
291{
292 struct path path;
293 char *fo_path;
294 int error;
295
296 /* sanity check */
297 if (size == 0)
298 return -EINVAL;
299
300 if (buf[size-1] != '\n')
301 return -EINVAL;
302
303 fo_path = buf;
304 if (qword_get(&buf, fo_path, size) < 0)
305 return -EINVAL;
306
307 error = kern_path(fo_path, 0, &path);
308 if (error)
309 return error;
310
311 /*
312 * XXX: Needs better sanity checking. Otherwise we could end up
313 * releasing locks on the wrong file system.
314 *
315 * For example:
316 * 1. Does the path refer to a directory?
317 * 2. Is that directory a mount point, or
318 * 3. Is that directory the root of an exported file system?
319 */
320 error = nlmsvc_unlock_all_by_sb(path.dentry->d_sb);
321
322 path_put(&path);
323 return error;
324}
325
326/**
327 * write_filehandle - Get a variable-length NFS file handle by path
328 *
329 * On input, the buffer contains a '\n'-terminated C string comprised of
330 * three alphanumeric words separated by whitespace. The string may
331 * contain escape sequences.
332 *
333 * Input:
334 * buf:
335 * domain: client domain name
336 * path: export pathname
337 * maxsize: numeric maximum size of
338 * @buf
339 * size: length of C string in @buf
340 * Output:
341 * On success: passed-in buffer filled with '\n'-terminated C
342 * string containing a ASCII hex text version
343 * of the NFS file handle;
344 * return code is the size in bytes of the string
345 * On error: return code is negative errno value
346 */
347static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
348{
349 char *dname, *path;
350 int uninitialized_var(maxsize);
351 char *mesg = buf;
352 int len;
353 struct auth_domain *dom;
354 struct knfsd_fh fh;
355
356 if (size == 0)
357 return -EINVAL;
358
359 if (buf[size-1] != '\n')
360 return -EINVAL;
361 buf[size-1] = 0;
362
363 dname = mesg;
364 len = qword_get(&mesg, dname, size);
365 if (len <= 0)
366 return -EINVAL;
367
368 path = dname+len+1;
369 len = qword_get(&mesg, path, size);
370 if (len <= 0)
371 return -EINVAL;
372
373 len = get_int(&mesg, &maxsize);
374 if (len)
375 return len;
376
377 if (maxsize < NFS_FHSIZE)
378 return -EINVAL;
379 maxsize = min(maxsize, NFS3_FHSIZE);
380
381 if (qword_get(&mesg, mesg, size)>0)
382 return -EINVAL;
383
384 /* we have all the words, they are in buf.. */
385 dom = unix_domain_find(dname);
386 if (!dom)
387 return -ENOMEM;
388
389 len = exp_rootfh(netns(file), dom, path, &fh, maxsize);
390 auth_domain_put(dom);
391 if (len)
392 return len;
393
394 mesg = buf;
395 len = SIMPLE_TRANSACTION_LIMIT;
396 qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
397 mesg[-1] = '\n';
398 return mesg - buf;
399}
400
401/**
402 * write_threads - Start NFSD, or report the current number of running threads
403 *
404 * Input:
405 * buf: ignored
406 * size: zero
407 * Output:
408 * On success: passed-in buffer filled with '\n'-terminated C
409 * string numeric value representing the number of
410 * running NFSD threads;
411 * return code is the size in bytes of the string
412 * On error: return code is zero
413 *
414 * OR
415 *
416 * Input:
417 * buf: C string containing an unsigned
418 * integer value representing the
419 * number of NFSD threads to start
420 * size: non-zero length of C string in @buf
421 * Output:
422 * On success: NFS service is started;
423 * passed-in buffer filled with '\n'-terminated C
424 * string numeric value representing the number of
425 * running NFSD threads;
426 * return code is the size in bytes of the string
427 * On error: return code is zero or a negative errno value
428 */
429static ssize_t write_threads(struct file *file, char *buf, size_t size)
430{
431 char *mesg = buf;
432 int rv;
433 struct net *net = netns(file);
434
435 if (size > 0) {
436 int newthreads;
437 rv = get_int(&mesg, &newthreads);
438 if (rv)
439 return rv;
440 if (newthreads < 0)
441 return -EINVAL;
442 rv = nfsd_svc(newthreads, net);
443 if (rv < 0)
444 return rv;
445 } else
446 rv = nfsd_nrthreads(net);
447
448 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
449}
450
451/**
452 * write_pool_threads - Set or report the current number of threads per pool
453 *
454 * Input:
455 * buf: ignored
456 * size: zero
457 *
458 * OR
459 *
460 * Input:
461 * buf: C string containing whitespace-
462 * separated unsigned integer values
463 * representing the number of NFSD
464 * threads to start in each pool
465 * size: non-zero length of C string in @buf
466 * Output:
467 * On success: passed-in buffer filled with '\n'-terminated C
468 * string containing integer values representing the
469 * number of NFSD threads in each pool;
470 * return code is the size in bytes of the string
471 * On error: return code is zero or a negative errno value
472 */
473static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
474{
475 /* if size > 0, look for an array of number of threads per node
476 * and apply them then write out number of threads per node as reply
477 */
478 char *mesg = buf;
479 int i;
480 int rv;
481 int len;
482 int npools;
483 int *nthreads;
484 struct net *net = netns(file);
485
486 mutex_lock(&nfsd_mutex);
487 npools = nfsd_nrpools(net);
488 if (npools == 0) {
489 /*
490 * NFS is shut down. The admin can start it by
491 * writing to the threads file but NOT the pool_threads
492 * file, sorry. Report zero threads.
493 */
494 mutex_unlock(&nfsd_mutex);
495 strcpy(buf, "0\n");
496 return strlen(buf);
497 }
498
499 nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
500 rv = -ENOMEM;
501 if (nthreads == NULL)
502 goto out_free;
503
504 if (size > 0) {
505 for (i = 0; i < npools; i++) {
506 rv = get_int(&mesg, &nthreads[i]);
507 if (rv == -ENOENT)
508 break; /* fewer numbers than pools */
509 if (rv)
510 goto out_free; /* syntax error */
511 rv = -EINVAL;
512 if (nthreads[i] < 0)
513 goto out_free;
514 }
515 rv = nfsd_set_nrthreads(i, nthreads, net);
516 if (rv)
517 goto out_free;
518 }
519
520 rv = nfsd_get_nrthreads(npools, nthreads, net);
521 if (rv)
522 goto out_free;
523
524 mesg = buf;
525 size = SIMPLE_TRANSACTION_LIMIT;
526 for (i = 0; i < npools && size > 0; i++) {
527 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
528 len = strlen(mesg);
529 size -= len;
530 mesg += len;
531 }
532 rv = mesg - buf;
533out_free:
534 kfree(nthreads);
535 mutex_unlock(&nfsd_mutex);
536 return rv;
537}
538
539static ssize_t __write_versions(struct file *file, char *buf, size_t size)
540{
541 char *mesg = buf;
542 char *vers, *minorp, sign;
543 int len, num, remaining;
544 unsigned minor;
545 ssize_t tlen = 0;
546 char *sep;
547 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
548
549 if (size>0) {
550 if (nn->nfsd_serv)
551 /* Cannot change versions without updating
552 * nn->nfsd_serv->sv_xdrsize, and reallocing
553 * rq_argp and rq_resp
554 */
555 return -EBUSY;
556 if (buf[size-1] != '\n')
557 return -EINVAL;
558 buf[size-1] = 0;
559
560 vers = mesg;
561 len = qword_get(&mesg, vers, size);
562 if (len <= 0) return -EINVAL;
563 do {
564 sign = *vers;
565 if (sign == '+' || sign == '-')
566 num = simple_strtol((vers+1), &minorp, 0);
567 else
568 num = simple_strtol(vers, &minorp, 0);
569 if (*minorp == '.') {
570 if (num != 4)
571 return -EINVAL;
572 minor = simple_strtoul(minorp+1, NULL, 0);
573 if (minor == 0)
574 return -EINVAL;
575 if (nfsd_minorversion(minor, sign == '-' ?
576 NFSD_CLEAR : NFSD_SET) < 0)
577 return -EINVAL;
578 goto next;
579 }
580 switch(num) {
581 case 2:
582 case 3:
583 case 4:
584 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
585 break;
586 default:
587 return -EINVAL;
588 }
589 next:
590 vers += len + 1;
591 } while ((len = qword_get(&mesg, vers, size)) > 0);
592 /* If all get turned off, turn them back on, as
593 * having no versions is BAD
594 */
595 nfsd_reset_versions();
596 }
597
598 /* Now write current state into reply buffer */
599 len = 0;
600 sep = "";
601 remaining = SIMPLE_TRANSACTION_LIMIT;
602 for (num=2 ; num <= 4 ; num++)
603 if (nfsd_vers(num, NFSD_AVAIL)) {
604 len = snprintf(buf, remaining, "%s%c%d", sep,
605 nfsd_vers(num, NFSD_TEST)?'+':'-',
606 num);
607 sep = " ";
608
609 if (len >= remaining)
610 break;
611 remaining -= len;
612 buf += len;
613 tlen += len;
614 }
615 if (nfsd_vers(4, NFSD_AVAIL))
616 for (minor = 1; minor <= NFSD_SUPPORTED_MINOR_VERSION;
617 minor++) {
618 len = snprintf(buf, remaining, " %c4.%u",
619 (nfsd_vers(4, NFSD_TEST) &&
620 nfsd_minorversion(minor, NFSD_TEST)) ?
621 '+' : '-',
622 minor);
623
624 if (len >= remaining)
625 break;
626 remaining -= len;
627 buf += len;
628 tlen += len;
629 }
630
631 len = snprintf(buf, remaining, "\n");
632 if (len >= remaining)
633 return -EINVAL;
634 return tlen + len;
635}
636
637/**
638 * write_versions - Set or report the available NFS protocol versions
639 *
640 * Input:
641 * buf: ignored
642 * size: zero
643 * Output:
644 * On success: passed-in buffer filled with '\n'-terminated C
645 * string containing positive or negative integer
646 * values representing the current status of each
647 * protocol version;
648 * return code is the size in bytes of the string
649 * On error: return code is zero or a negative errno value
650 *
651 * OR
652 *
653 * Input:
654 * buf: C string containing whitespace-
655 * separated positive or negative
656 * integer values representing NFS
657 * protocol versions to enable ("+n")
658 * or disable ("-n")
659 * size: non-zero length of C string in @buf
660 * Output:
661 * On success: status of zero or more protocol versions has
662 * been updated; passed-in buffer filled with
663 * '\n'-terminated C string containing positive
664 * or negative integer values representing the
665 * current status of each protocol version;
666 * return code is the size in bytes of the string
667 * On error: return code is zero or a negative errno value
668 */
669static ssize_t write_versions(struct file *file, char *buf, size_t size)
670{
671 ssize_t rv;
672
673 mutex_lock(&nfsd_mutex);
674 rv = __write_versions(file, buf, size);
675 mutex_unlock(&nfsd_mutex);
676 return rv;
677}
678
679/*
680 * Zero-length write. Return a list of NFSD's current listener
681 * transports.
682 */
683static ssize_t __write_ports_names(char *buf, struct net *net)
684{
685 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
686
687 if (nn->nfsd_serv == NULL)
688 return 0;
689 return svc_xprt_names(nn->nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
690}
691
692/*
693 * A single 'fd' number was written, in which case it must be for
694 * a socket of a supported family/protocol, and we use it as an
695 * nfsd listener.
696 */
697static ssize_t __write_ports_addfd(char *buf, struct net *net)
698{
699 char *mesg = buf;
700 int fd, err;
701 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
702
703 err = get_int(&mesg, &fd);
704 if (err != 0 || fd < 0)
705 return -EINVAL;
706
707 if (svc_alien_sock(net, fd)) {
708 printk(KERN_ERR "%s: socket net is different to NFSd's one\n", __func__);
709 return -EINVAL;
710 }
711
712 err = nfsd_create_serv(net);
713 if (err != 0)
714 return err;
715
716 err = svc_addsock(nn->nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT);
717 if (err < 0) {
718 nfsd_destroy(net);
719 return err;
720 }
721
722 /* Decrease the count, but don't shut down the service */
723 nn->nfsd_serv->sv_nrthreads--;
724 return err;
725}
726
727/*
728 * A transport listener is added by writing it's transport name and
729 * a port number.
730 */
731static ssize_t __write_ports_addxprt(char *buf, struct net *net)
732{
733 char transport[16];
734 struct svc_xprt *xprt;
735 int port, err;
736 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
737
738 if (sscanf(buf, "%15s %5u", transport, &port) != 2)
739 return -EINVAL;
740
741 if (port < 1 || port > USHRT_MAX)
742 return -EINVAL;
743
744 err = nfsd_create_serv(net);
745 if (err != 0)
746 return err;
747
748 err = svc_create_xprt(nn->nfsd_serv, transport, net,
749 PF_INET, port, SVC_SOCK_ANONYMOUS);
750 if (err < 0)
751 goto out_err;
752
753 err = svc_create_xprt(nn->nfsd_serv, transport, net,
754 PF_INET6, port, SVC_SOCK_ANONYMOUS);
755 if (err < 0 && err != -EAFNOSUPPORT)
756 goto out_close;
757
758 /* Decrease the count, but don't shut down the service */
759 nn->nfsd_serv->sv_nrthreads--;
760 return 0;
761out_close:
762 xprt = svc_find_xprt(nn->nfsd_serv, transport, net, PF_INET, port);
763 if (xprt != NULL) {
764 svc_close_xprt(xprt);
765 svc_xprt_put(xprt);
766 }
767out_err:
768 nfsd_destroy(net);
769 return err;
770}
771
772static ssize_t __write_ports(struct file *file, char *buf, size_t size,
773 struct net *net)
774{
775 if (size == 0)
776 return __write_ports_names(buf, net);
777
778 if (isdigit(buf[0]))
779 return __write_ports_addfd(buf, net);
780
781 if (isalpha(buf[0]))
782 return __write_ports_addxprt(buf, net);
783
784 return -EINVAL;
785}
786
787/**
788 * write_ports - Pass a socket file descriptor or transport name to listen on
789 *
790 * Input:
791 * buf: ignored
792 * size: zero
793 * Output:
794 * On success: passed-in buffer filled with a '\n'-terminated C
795 * string containing a whitespace-separated list of
796 * named NFSD listeners;
797 * return code is the size in bytes of the string
798 * On error: return code is zero or a negative errno value
799 *
800 * OR
801 *
802 * Input:
803 * buf: C string containing an unsigned
804 * integer value representing a bound
805 * but unconnected socket that is to be
806 * used as an NFSD listener; listen(3)
807 * must be called for a SOCK_STREAM
808 * socket, otherwise it is ignored
809 * size: non-zero length of C string in @buf
810 * Output:
811 * On success: NFS service is started;
812 * passed-in buffer filled with a '\n'-terminated C
813 * string containing a unique alphanumeric name of
814 * the listener;
815 * return code is the size in bytes of the string
816 * On error: return code is a negative errno value
817 *
818 * OR
819 *
820 * Input:
821 * buf: C string containing a transport
822 * name and an unsigned integer value
823 * representing the port to listen on,
824 * separated by whitespace
825 * size: non-zero length of C string in @buf
826 * Output:
827 * On success: returns zero; NFS service is started
828 * On error: return code is a negative errno value
829 */
830static ssize_t write_ports(struct file *file, char *buf, size_t size)
831{
832 ssize_t rv;
833
834 mutex_lock(&nfsd_mutex);
835 rv = __write_ports(file, buf, size, netns(file));
836 mutex_unlock(&nfsd_mutex);
837 return rv;
838}
839
840
841int nfsd_max_blksize;
842
843/**
844 * write_maxblksize - Set or report the current NFS blksize
845 *
846 * Input:
847 * buf: ignored
848 * size: zero
849 *
850 * OR
851 *
852 * Input:
853 * buf: C string containing an unsigned
854 * integer value representing the new
855 * NFS blksize
856 * size: non-zero length of C string in @buf
857 * Output:
858 * On success: passed-in buffer filled with '\n'-terminated C string
859 * containing numeric value of the current NFS blksize
860 * setting;
861 * return code is the size in bytes of the string
862 * On error: return code is zero or a negative errno value
863 */
864static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
865{
866 char *mesg = buf;
867 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
868
869 if (size > 0) {
870 int bsize;
871 int rv = get_int(&mesg, &bsize);
872 if (rv)
873 return rv;
874 /* force bsize into allowed range and
875 * required alignment.
876 */
877 bsize = max_t(int, bsize, 1024);
878 bsize = min_t(int, bsize, NFSSVC_MAXBLKSIZE);
879 bsize &= ~(1024-1);
880 mutex_lock(&nfsd_mutex);
881 if (nn->nfsd_serv) {
882 mutex_unlock(&nfsd_mutex);
883 return -EBUSY;
884 }
885 nfsd_max_blksize = bsize;
886 mutex_unlock(&nfsd_mutex);
887 }
888
889 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
890 nfsd_max_blksize);
891}
892
893/**
894 * write_maxconn - Set or report the current max number of connections
895 *
896 * Input:
897 * buf: ignored
898 * size: zero
899 * OR
900 *
901 * Input:
902 * buf: C string containing an unsigned
903 * integer value representing the new
904 * number of max connections
905 * size: non-zero length of C string in @buf
906 * Output:
907 * On success: passed-in buffer filled with '\n'-terminated C string
908 * containing numeric value of max_connections setting
909 * for this net namespace;
910 * return code is the size in bytes of the string
911 * On error: return code is zero or a negative errno value
912 */
913static ssize_t write_maxconn(struct file *file, char *buf, size_t size)
914{
915 char *mesg = buf;
916 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
917 unsigned int maxconn = nn->max_connections;
918
919 if (size > 0) {
920 int rv = get_uint(&mesg, &maxconn);
921
922 if (rv)
923 return rv;
924 nn->max_connections = maxconn;
925 }
926
927 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%u\n", maxconn);
928}
929
930#ifdef CONFIG_NFSD_V4
931static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size,
932 time_t *time, struct nfsd_net *nn)
933{
934 char *mesg = buf;
935 int rv, i;
936
937 if (size > 0) {
938 if (nn->nfsd_serv)
939 return -EBUSY;
940 rv = get_int(&mesg, &i);
941 if (rv)
942 return rv;
943 /*
944 * Some sanity checking. We don't have a reason for
945 * these particular numbers, but problems with the
946 * extremes are:
947 * - Too short: the briefest network outage may
948 * cause clients to lose all their locks. Also,
949 * the frequent polling may be wasteful.
950 * - Too long: do you really want reboot recovery
951 * to take more than an hour? Or to make other
952 * clients wait an hour before being able to
953 * revoke a dead client's locks?
954 */
955 if (i < 10 || i > 3600)
956 return -EINVAL;
957 *time = i;
958 }
959
960 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%ld\n", *time);
961}
962
963static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size,
964 time_t *time, struct nfsd_net *nn)
965{
966 ssize_t rv;
967
968 mutex_lock(&nfsd_mutex);
969 rv = __nfsd4_write_time(file, buf, size, time, nn);
970 mutex_unlock(&nfsd_mutex);
971 return rv;
972}
973
974/**
975 * write_leasetime - Set or report the current NFSv4 lease time
976 *
977 * Input:
978 * buf: ignored
979 * size: zero
980 *
981 * OR
982 *
983 * Input:
984 * buf: C string containing an unsigned
985 * integer value representing the new
986 * NFSv4 lease expiry time
987 * size: non-zero length of C string in @buf
988 * Output:
989 * On success: passed-in buffer filled with '\n'-terminated C
990 * string containing unsigned integer value of the
991 * current lease expiry time;
992 * return code is the size in bytes of the string
993 * On error: return code is zero or a negative errno value
994 */
995static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
996{
997 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
998 return nfsd4_write_time(file, buf, size, &nn->nfsd4_lease, nn);
999}
1000
1001/**
1002 * write_gracetime - Set or report current NFSv4 grace period time
1003 *
1004 * As above, but sets the time of the NFSv4 grace period.
1005 *
1006 * Note this should never be set to less than the *previous*
1007 * lease-period time, but we don't try to enforce this. (In the common
1008 * case (a new boot), we don't know what the previous lease time was
1009 * anyway.)
1010 */
1011static ssize_t write_gracetime(struct file *file, char *buf, size_t size)
1012{
1013 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1014 return nfsd4_write_time(file, buf, size, &nn->nfsd4_grace, nn);
1015}
1016
1017static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size,
1018 struct nfsd_net *nn)
1019{
1020 char *mesg = buf;
1021 char *recdir;
1022 int len, status;
1023
1024 if (size > 0) {
1025 if (nn->nfsd_serv)
1026 return -EBUSY;
1027 if (size > PATH_MAX || buf[size-1] != '\n')
1028 return -EINVAL;
1029 buf[size-1] = 0;
1030
1031 recdir = mesg;
1032 len = qword_get(&mesg, recdir, size);
1033 if (len <= 0)
1034 return -EINVAL;
1035
1036 status = nfs4_reset_recoverydir(recdir);
1037 if (status)
1038 return status;
1039 }
1040
1041 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
1042 nfs4_recoverydir());
1043}
1044
1045/**
1046 * write_recoverydir - Set or report the pathname of the recovery directory
1047 *
1048 * Input:
1049 * buf: ignored
1050 * size: zero
1051 *
1052 * OR
1053 *
1054 * Input:
1055 * buf: C string containing the pathname
1056 * of the directory on a local file
1057 * system containing permanent NFSv4
1058 * recovery data
1059 * size: non-zero length of C string in @buf
1060 * Output:
1061 * On success: passed-in buffer filled with '\n'-terminated C string
1062 * containing the current recovery pathname setting;
1063 * return code is the size in bytes of the string
1064 * On error: return code is zero or a negative errno value
1065 */
1066static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
1067{
1068 ssize_t rv;
1069 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1070
1071 mutex_lock(&nfsd_mutex);
1072 rv = __write_recoverydir(file, buf, size, nn);
1073 mutex_unlock(&nfsd_mutex);
1074 return rv;
1075}
1076
1077/**
1078 * write_v4_end_grace - release grace period for nfsd's v4.x lock manager
1079 *
1080 * Input:
1081 * buf: ignored
1082 * size: zero
1083 * OR
1084 *
1085 * Input:
1086 * buf: any value
1087 * size: non-zero length of C string in @buf
1088 * Output:
1089 * passed-in buffer filled with "Y" or "N" with a newline
1090 * and NULL-terminated C string. This indicates whether
1091 * the grace period has ended in the current net
1092 * namespace. Return code is the size in bytes of the
1093 * string. Writing a string that starts with 'Y', 'y', or
1094 * '1' to the file will end the grace period for nfsd's v4
1095 * lock manager.
1096 */
1097static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size)
1098{
1099 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1100
1101 if (size > 0) {
1102 switch(buf[0]) {
1103 case 'Y':
1104 case 'y':
1105 case '1':
1106 nfsd4_end_grace(nn);
1107 break;
1108 default:
1109 return -EINVAL;
1110 }
1111 }
1112
1113 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%c\n",
1114 nn->grace_ended ? 'Y' : 'N');
1115}
1116
1117#endif
1118
1119/*----------------------------------------------------------------------------*/
1120/*
1121 * populating the filesystem.
1122 */
1123
1124static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
1125{
1126 static struct tree_descr nfsd_files[] = {
1127 [NFSD_List] = {"exports", &exports_nfsd_operations, S_IRUGO},
1128 [NFSD_Export_features] = {"export_features",
1129 &export_features_operations, S_IRUGO},
1130 [NFSD_FO_UnlockIP] = {"unlock_ip",
1131 &transaction_ops, S_IWUSR|S_IRUSR},
1132 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1133 &transaction_ops, S_IWUSR|S_IRUSR},
1134 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1135 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1136 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1137 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1138 [NFSD_Reply_Cache_Stats] = {"reply_cache_stats", &reply_cache_stats_operations, S_IRUGO},
1139 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1140 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1141 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1142 [NFSD_MaxConnections] = {"max_connections", &transaction_ops, S_IWUSR|S_IRUGO},
1143#if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
1144 [NFSD_SupportedEnctypes] = {"supported_krb5_enctypes", &supported_enctypes_ops, S_IRUGO},
1145#endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
1146#ifdef CONFIG_NFSD_V4
1147 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1148 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
1149 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1150 [NFSD_V4EndGrace] = {"v4_end_grace", &transaction_ops, S_IWUSR|S_IRUGO},
1151#endif
1152 /* last one */ {""}
1153 };
1154 get_net(sb->s_fs_info);
1155 return simple_fill_super(sb, 0x6e667364, nfsd_files);
1156}
1157
1158static struct dentry *nfsd_mount(struct file_system_type *fs_type,
1159 int flags, const char *dev_name, void *data)
1160{
1161 struct net *net = current->nsproxy->net_ns;
1162 return mount_ns(fs_type, flags, data, net, net->user_ns, nfsd_fill_super);
1163}
1164
1165static void nfsd_umount(struct super_block *sb)
1166{
1167 struct net *net = sb->s_fs_info;
1168
1169 kill_litter_super(sb);
1170 put_net(net);
1171}
1172
1173static struct file_system_type nfsd_fs_type = {
1174 .owner = THIS_MODULE,
1175 .name = "nfsd",
1176 .mount = nfsd_mount,
1177 .kill_sb = nfsd_umount,
1178};
1179MODULE_ALIAS_FS("nfsd");
1180
1181#ifdef CONFIG_PROC_FS
1182static int create_proc_exports_entry(void)
1183{
1184 struct proc_dir_entry *entry;
1185
1186 entry = proc_mkdir("fs/nfs", NULL);
1187 if (!entry)
1188 return -ENOMEM;
1189 entry = proc_create("exports", 0, entry,
1190 &exports_proc_operations);
1191 if (!entry) {
1192 remove_proc_entry("fs/nfs", NULL);
1193 return -ENOMEM;
1194 }
1195 return 0;
1196}
1197#else /* CONFIG_PROC_FS */
1198static int create_proc_exports_entry(void)
1199{
1200 return 0;
1201}
1202#endif
1203
1204unsigned int nfsd_net_id;
1205
1206static __net_init int nfsd_init_net(struct net *net)
1207{
1208 int retval;
1209 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1210
1211 retval = nfsd_export_init(net);
1212 if (retval)
1213 goto out_export_error;
1214 retval = nfsd_idmap_init(net);
1215 if (retval)
1216 goto out_idmap_error;
1217 nn->nfsd4_lease = 90; /* default lease time */
1218 nn->nfsd4_grace = 90;
1219 nn->clverifier_counter = prandom_u32();
1220 nn->clientid_counter = prandom_u32();
1221 return 0;
1222
1223out_idmap_error:
1224 nfsd_export_shutdown(net);
1225out_export_error:
1226 return retval;
1227}
1228
1229static __net_exit void nfsd_exit_net(struct net *net)
1230{
1231 nfsd_idmap_shutdown(net);
1232 nfsd_export_shutdown(net);
1233}
1234
1235static struct pernet_operations nfsd_net_ops = {
1236 .init = nfsd_init_net,
1237 .exit = nfsd_exit_net,
1238 .id = &nfsd_net_id,
1239 .size = sizeof(struct nfsd_net),
1240};
1241
1242static int __init init_nfsd(void)
1243{
1244 int retval;
1245 printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
1246
1247 retval = register_pernet_subsys(&nfsd_net_ops);
1248 if (retval < 0)
1249 return retval;
1250 retval = register_cld_notifier();
1251 if (retval)
1252 goto out_unregister_pernet;
1253 retval = nfsd4_init_slabs();
1254 if (retval)
1255 goto out_unregister_notifier;
1256 retval = nfsd4_init_pnfs();
1257 if (retval)
1258 goto out_free_slabs;
1259 retval = nfsd_fault_inject_init(); /* nfsd fault injection controls */
1260 if (retval)
1261 goto out_exit_pnfs;
1262 nfsd_stat_init(); /* Statistics */
1263 retval = nfsd_reply_cache_init();
1264 if (retval)
1265 goto out_free_stat;
1266 nfsd_lockd_init(); /* lockd->nfsd callbacks */
1267 retval = create_proc_exports_entry();
1268 if (retval)
1269 goto out_free_lockd;
1270 retval = register_filesystem(&nfsd_fs_type);
1271 if (retval)
1272 goto out_free_all;
1273 return 0;
1274out_free_all:
1275 remove_proc_entry("fs/nfs/exports", NULL);
1276 remove_proc_entry("fs/nfs", NULL);
1277out_free_lockd:
1278 nfsd_lockd_shutdown();
1279 nfsd_reply_cache_shutdown();
1280out_free_stat:
1281 nfsd_stat_shutdown();
1282 nfsd_fault_inject_cleanup();
1283out_exit_pnfs:
1284 nfsd4_exit_pnfs();
1285out_free_slabs:
1286 nfsd4_free_slabs();
1287out_unregister_notifier:
1288 unregister_cld_notifier();
1289out_unregister_pernet:
1290 unregister_pernet_subsys(&nfsd_net_ops);
1291 return retval;
1292}
1293
1294static void __exit exit_nfsd(void)
1295{
1296 nfsd_reply_cache_shutdown();
1297 remove_proc_entry("fs/nfs/exports", NULL);
1298 remove_proc_entry("fs/nfs", NULL);
1299 nfsd_stat_shutdown();
1300 nfsd_lockd_shutdown();
1301 nfsd4_free_slabs();
1302 nfsd4_exit_pnfs();
1303 nfsd_fault_inject_cleanup();
1304 unregister_filesystem(&nfsd_fs_type);
1305 unregister_cld_notifier();
1306 unregister_pernet_subsys(&nfsd_net_ops);
1307}
1308
1309MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1310MODULE_LICENSE("GPL");
1311module_init(init_nfsd)
1312module_exit(exit_nfsd)