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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
25/*
26 * We have a single directory with several nodes in it.
27 */
28enum {
29 NFSD_Root = 1,
30 NFSD_List,
31 NFSD_Export_features,
32 NFSD_Fh,
33 NFSD_FO_UnlockIP,
34 NFSD_FO_UnlockFS,
35 NFSD_Threads,
36 NFSD_Pool_Threads,
37 NFSD_Pool_Stats,
38 NFSD_Reply_Cache_Stats,
39 NFSD_Versions,
40 NFSD_Ports,
41 NFSD_MaxBlkSize,
42 NFSD_SupportedEnctypes,
43 /*
44 * The below MUST come last. Otherwise we leave a hole in nfsd_files[]
45 * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
46 */
47#ifdef CONFIG_NFSD_V4
48 NFSD_Leasetime,
49 NFSD_Gracetime,
50 NFSD_RecoveryDir,
51#endif
52};
53
54/*
55 * write() for these nodes.
56 */
57static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
58static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size);
59static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size);
60static ssize_t write_threads(struct file *file, char *buf, size_t size);
61static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
62static ssize_t write_versions(struct file *file, char *buf, size_t size);
63static ssize_t write_ports(struct file *file, char *buf, size_t size);
64static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
65#ifdef CONFIG_NFSD_V4
66static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
67static ssize_t write_gracetime(struct file *file, char *buf, size_t size);
68static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
69#endif
70
71static ssize_t (*write_op[])(struct file *, char *, size_t) = {
72 [NFSD_Fh] = write_filehandle,
73 [NFSD_FO_UnlockIP] = write_unlock_ip,
74 [NFSD_FO_UnlockFS] = write_unlock_fs,
75 [NFSD_Threads] = write_threads,
76 [NFSD_Pool_Threads] = write_pool_threads,
77 [NFSD_Versions] = write_versions,
78 [NFSD_Ports] = write_ports,
79 [NFSD_MaxBlkSize] = write_maxblksize,
80#ifdef CONFIG_NFSD_V4
81 [NFSD_Leasetime] = write_leasetime,
82 [NFSD_Gracetime] = write_gracetime,
83 [NFSD_RecoveryDir] = write_recoverydir,
84#endif
85};
86
87static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
88{
89 ino_t ino = file_inode(file)->i_ino;
90 char *data;
91 ssize_t rv;
92
93 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
94 return -EINVAL;
95
96 data = simple_transaction_get(file, buf, size);
97 if (IS_ERR(data))
98 return PTR_ERR(data);
99
100 rv = write_op[ino](file, data, size);
101 if (rv >= 0) {
102 simple_transaction_set(file, rv);
103 rv = size;
104 }
105 return rv;
106}
107
108static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
109{
110 if (! file->private_data) {
111 /* An attempt to read a transaction file without writing
112 * causes a 0-byte write so that the file can return
113 * state information
114 */
115 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
116 if (rv < 0)
117 return rv;
118 }
119 return simple_transaction_read(file, buf, size, pos);
120}
121
122static const struct file_operations transaction_ops = {
123 .write = nfsctl_transaction_write,
124 .read = nfsctl_transaction_read,
125 .release = simple_transaction_release,
126 .llseek = default_llseek,
127};
128
129static int exports_net_open(struct net *net, struct file *file)
130{
131 int err;
132 struct seq_file *seq;
133 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
134
135 err = seq_open(file, &nfs_exports_op);
136 if (err)
137 return err;
138
139 seq = file->private_data;
140 seq->private = nn->svc_export_cache;
141 return 0;
142}
143
144static int exports_proc_open(struct inode *inode, struct file *file)
145{
146 return exports_net_open(current->nsproxy->net_ns, file);
147}
148
149static const struct file_operations exports_proc_operations = {
150 .open = exports_proc_open,
151 .read = seq_read,
152 .llseek = seq_lseek,
153 .release = seq_release,
154 .owner = THIS_MODULE,
155};
156
157static int exports_nfsd_open(struct inode *inode, struct file *file)
158{
159 return exports_net_open(inode->i_sb->s_fs_info, file);
160}
161
162static const struct file_operations exports_nfsd_operations = {
163 .open = exports_nfsd_open,
164 .read = seq_read,
165 .llseek = seq_lseek,
166 .release = seq_release,
167 .owner = THIS_MODULE,
168};
169
170static int export_features_show(struct seq_file *m, void *v)
171{
172 seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS);
173 return 0;
174}
175
176static int export_features_open(struct inode *inode, struct file *file)
177{
178 return single_open(file, export_features_show, NULL);
179}
180
181static const struct file_operations export_features_operations = {
182 .open = export_features_open,
183 .read = seq_read,
184 .llseek = seq_lseek,
185 .release = single_release,
186};
187
188#if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
189static int supported_enctypes_show(struct seq_file *m, void *v)
190{
191 seq_printf(m, KRB5_SUPPORTED_ENCTYPES);
192 return 0;
193}
194
195static int supported_enctypes_open(struct inode *inode, struct file *file)
196{
197 return single_open(file, supported_enctypes_show, NULL);
198}
199
200static const struct file_operations supported_enctypes_ops = {
201 .open = supported_enctypes_open,
202 .read = seq_read,
203 .llseek = seq_lseek,
204 .release = single_release,
205};
206#endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
207
208static const struct file_operations pool_stats_operations = {
209 .open = nfsd_pool_stats_open,
210 .read = seq_read,
211 .llseek = seq_lseek,
212 .release = nfsd_pool_stats_release,
213 .owner = THIS_MODULE,
214};
215
216static struct file_operations reply_cache_stats_operations = {
217 .open = nfsd_reply_cache_stats_open,
218 .read = seq_read,
219 .llseek = seq_lseek,
220 .release = single_release,
221};
222
223/*----------------------------------------------------------------------------*/
224/*
225 * payload - write methods
226 */
227
228
229/**
230 * write_unlock_ip - Release all locks used by a client
231 *
232 * Experimental.
233 *
234 * Input:
235 * buf: '\n'-terminated C string containing a
236 * presentation format IP address
237 * size: length of C string in @buf
238 * Output:
239 * On success: returns zero if all specified locks were released;
240 * returns one if one or more locks were not released
241 * On error: return code is negative errno value
242 */
243static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
244{
245 struct sockaddr_storage address;
246 struct sockaddr *sap = (struct sockaddr *)&address;
247 size_t salen = sizeof(address);
248 char *fo_path;
249 struct net *net = file->f_dentry->d_sb->s_fs_info;
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 if (rpc_pton(net, fo_path, size, sap, salen) == 0)
263 return -EINVAL;
264
265 return nlmsvc_unlock_all_by_ip(sap);
266}
267
268/**
269 * write_unlock_fs - Release all locks on a local file system
270 *
271 * Experimental.
272 *
273 * Input:
274 * buf: '\n'-terminated C string containing the
275 * absolute pathname of a local file system
276 * size: length of C string in @buf
277 * Output:
278 * On success: returns zero if all specified locks were released;
279 * returns one if one or more locks were not released
280 * On error: return code is negative errno value
281 */
282static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
283{
284 struct path path;
285 char *fo_path;
286 int error;
287
288 /* sanity check */
289 if (size == 0)
290 return -EINVAL;
291
292 if (buf[size-1] != '\n')
293 return -EINVAL;
294
295 fo_path = buf;
296 if (qword_get(&buf, fo_path, size) < 0)
297 return -EINVAL;
298
299 error = kern_path(fo_path, 0, &path);
300 if (error)
301 return error;
302
303 /*
304 * XXX: Needs better sanity checking. Otherwise we could end up
305 * releasing locks on the wrong file system.
306 *
307 * For example:
308 * 1. Does the path refer to a directory?
309 * 2. Is that directory a mount point, or
310 * 3. Is that directory the root of an exported file system?
311 */
312 error = nlmsvc_unlock_all_by_sb(path.dentry->d_sb);
313
314 path_put(&path);
315 return error;
316}
317
318/**
319 * write_filehandle - Get a variable-length NFS file handle by path
320 *
321 * On input, the buffer contains a '\n'-terminated C string comprised of
322 * three alphanumeric words separated by whitespace. The string may
323 * contain escape sequences.
324 *
325 * Input:
326 * buf:
327 * domain: client domain name
328 * path: export pathname
329 * maxsize: numeric maximum size of
330 * @buf
331 * size: length of C string in @buf
332 * Output:
333 * On success: passed-in buffer filled with '\n'-terminated C
334 * string containing a ASCII hex text version
335 * of the NFS file handle;
336 * return code is the size in bytes of the string
337 * On error: return code is negative errno value
338 */
339static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
340{
341 char *dname, *path;
342 int uninitialized_var(maxsize);
343 char *mesg = buf;
344 int len;
345 struct auth_domain *dom;
346 struct knfsd_fh fh;
347 struct net *net = file->f_dentry->d_sb->s_fs_info;
348
349 if (size == 0)
350 return -EINVAL;
351
352 if (buf[size-1] != '\n')
353 return -EINVAL;
354 buf[size-1] = 0;
355
356 dname = mesg;
357 len = qword_get(&mesg, dname, size);
358 if (len <= 0)
359 return -EINVAL;
360
361 path = dname+len+1;
362 len = qword_get(&mesg, path, size);
363 if (len <= 0)
364 return -EINVAL;
365
366 len = get_int(&mesg, &maxsize);
367 if (len)
368 return len;
369
370 if (maxsize < NFS_FHSIZE)
371 return -EINVAL;
372 if (maxsize > NFS3_FHSIZE)
373 maxsize = NFS3_FHSIZE;
374
375 if (qword_get(&mesg, mesg, size)>0)
376 return -EINVAL;
377
378 /* we have all the words, they are in buf.. */
379 dom = unix_domain_find(dname);
380 if (!dom)
381 return -ENOMEM;
382
383 len = exp_rootfh(net, dom, path, &fh, maxsize);
384 auth_domain_put(dom);
385 if (len)
386 return len;
387
388 mesg = buf;
389 len = SIMPLE_TRANSACTION_LIMIT;
390 qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
391 mesg[-1] = '\n';
392 return mesg - buf;
393}
394
395/**
396 * write_threads - Start NFSD, or report the current number of running threads
397 *
398 * Input:
399 * buf: ignored
400 * size: zero
401 * Output:
402 * On success: passed-in buffer filled with '\n'-terminated C
403 * string numeric value representing the number of
404 * running NFSD threads;
405 * return code is the size in bytes of the string
406 * On error: return code is zero
407 *
408 * OR
409 *
410 * Input:
411 * buf: C string containing an unsigned
412 * integer value representing the
413 * number of NFSD threads to start
414 * size: non-zero length of C string in @buf
415 * Output:
416 * On success: NFS service is started;
417 * passed-in buffer filled with '\n'-terminated C
418 * string numeric value representing the number of
419 * running NFSD threads;
420 * return code is the size in bytes of the string
421 * On error: return code is zero or a negative errno value
422 */
423static ssize_t write_threads(struct file *file, char *buf, size_t size)
424{
425 char *mesg = buf;
426 int rv;
427 struct net *net = file->f_dentry->d_sb->s_fs_info;
428
429 if (size > 0) {
430 int newthreads;
431 rv = get_int(&mesg, &newthreads);
432 if (rv)
433 return rv;
434 if (newthreads < 0)
435 return -EINVAL;
436 rv = nfsd_svc(newthreads, net);
437 if (rv < 0)
438 return rv;
439 } else
440 rv = nfsd_nrthreads(net);
441
442 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
443}
444
445/**
446 * write_pool_threads - Set or report the current number of threads per pool
447 *
448 * Input:
449 * buf: ignored
450 * size: zero
451 *
452 * OR
453 *
454 * Input:
455 * buf: C string containing whitespace-
456 * separated unsigned integer values
457 * representing the number of NFSD
458 * threads to start in each pool
459 * size: non-zero length of C string in @buf
460 * Output:
461 * On success: passed-in buffer filled with '\n'-terminated C
462 * string containing integer values representing the
463 * number of NFSD threads in each pool;
464 * return code is the size in bytes of the string
465 * On error: return code is zero or a negative errno value
466 */
467static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
468{
469 /* if size > 0, look for an array of number of threads per node
470 * and apply them then write out number of threads per node as reply
471 */
472 char *mesg = buf;
473 int i;
474 int rv;
475 int len;
476 int npools;
477 int *nthreads;
478 struct net *net = file->f_dentry->d_sb->s_fs_info;
479
480 mutex_lock(&nfsd_mutex);
481 npools = nfsd_nrpools(net);
482 if (npools == 0) {
483 /*
484 * NFS is shut down. The admin can start it by
485 * writing to the threads file but NOT the pool_threads
486 * file, sorry. Report zero threads.
487 */
488 mutex_unlock(&nfsd_mutex);
489 strcpy(buf, "0\n");
490 return strlen(buf);
491 }
492
493 nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
494 rv = -ENOMEM;
495 if (nthreads == NULL)
496 goto out_free;
497
498 if (size > 0) {
499 for (i = 0; i < npools; i++) {
500 rv = get_int(&mesg, &nthreads[i]);
501 if (rv == -ENOENT)
502 break; /* fewer numbers than pools */
503 if (rv)
504 goto out_free; /* syntax error */
505 rv = -EINVAL;
506 if (nthreads[i] < 0)
507 goto out_free;
508 }
509 rv = nfsd_set_nrthreads(i, nthreads, net);
510 if (rv)
511 goto out_free;
512 }
513
514 rv = nfsd_get_nrthreads(npools, nthreads, net);
515 if (rv)
516 goto out_free;
517
518 mesg = buf;
519 size = SIMPLE_TRANSACTION_LIMIT;
520 for (i = 0; i < npools && size > 0; i++) {
521 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
522 len = strlen(mesg);
523 size -= len;
524 mesg += len;
525 }
526 rv = mesg - buf;
527out_free:
528 kfree(nthreads);
529 mutex_unlock(&nfsd_mutex);
530 return rv;
531}
532
533static ssize_t __write_versions(struct file *file, char *buf, size_t size)
534{
535 char *mesg = buf;
536 char *vers, *minorp, sign;
537 int len, num, remaining;
538 unsigned minor;
539 ssize_t tlen = 0;
540 char *sep;
541 struct net *net = file->f_dentry->d_sb->s_fs_info;
542 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
543
544 if (size>0) {
545 if (nn->nfsd_serv)
546 /* Cannot change versions without updating
547 * nn->nfsd_serv->sv_xdrsize, and reallocing
548 * rq_argp and rq_resp
549 */
550 return -EBUSY;
551 if (buf[size-1] != '\n')
552 return -EINVAL;
553 buf[size-1] = 0;
554
555 vers = mesg;
556 len = qword_get(&mesg, vers, size);
557 if (len <= 0) return -EINVAL;
558 do {
559 sign = *vers;
560 if (sign == '+' || sign == '-')
561 num = simple_strtol((vers+1), &minorp, 0);
562 else
563 num = simple_strtol(vers, &minorp, 0);
564 if (*minorp == '.') {
565 if (num != 4)
566 return -EINVAL;
567 minor = simple_strtoul(minorp+1, NULL, 0);
568 if (minor == 0)
569 return -EINVAL;
570 if (nfsd_minorversion(minor, sign == '-' ?
571 NFSD_CLEAR : NFSD_SET) < 0)
572 return -EINVAL;
573 goto next;
574 }
575 switch(num) {
576 case 2:
577 case 3:
578 case 4:
579 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
580 break;
581 default:
582 return -EINVAL;
583 }
584 next:
585 vers += len + 1;
586 } while ((len = qword_get(&mesg, vers, size)) > 0);
587 /* If all get turned off, turn them back on, as
588 * having no versions is BAD
589 */
590 nfsd_reset_versions();
591 }
592
593 /* Now write current state into reply buffer */
594 len = 0;
595 sep = "";
596 remaining = SIMPLE_TRANSACTION_LIMIT;
597 for (num=2 ; num <= 4 ; num++)
598 if (nfsd_vers(num, NFSD_AVAIL)) {
599 len = snprintf(buf, remaining, "%s%c%d", sep,
600 nfsd_vers(num, NFSD_TEST)?'+':'-',
601 num);
602 sep = " ";
603
604 if (len > remaining)
605 break;
606 remaining -= len;
607 buf += len;
608 tlen += len;
609 }
610 if (nfsd_vers(4, NFSD_AVAIL))
611 for (minor = 1; minor <= NFSD_SUPPORTED_MINOR_VERSION;
612 minor++) {
613 len = snprintf(buf, remaining, " %c4.%u",
614 (nfsd_vers(4, NFSD_TEST) &&
615 nfsd_minorversion(minor, NFSD_TEST)) ?
616 '+' : '-',
617 minor);
618
619 if (len > remaining)
620 break;
621 remaining -= len;
622 buf += len;
623 tlen += len;
624 }
625
626 len = snprintf(buf, remaining, "\n");
627 if (len > remaining)
628 return -EINVAL;
629 return tlen + len;
630}
631
632/**
633 * write_versions - Set or report the available NFS protocol versions
634 *
635 * Input:
636 * buf: ignored
637 * size: zero
638 * Output:
639 * On success: passed-in buffer filled with '\n'-terminated C
640 * string containing positive or negative integer
641 * values representing the current status of each
642 * protocol version;
643 * return code is the size in bytes of the string
644 * On error: return code is zero or a negative errno value
645 *
646 * OR
647 *
648 * Input:
649 * buf: C string containing whitespace-
650 * separated positive or negative
651 * integer values representing NFS
652 * protocol versions to enable ("+n")
653 * or disable ("-n")
654 * size: non-zero length of C string in @buf
655 * Output:
656 * On success: status of zero or more protocol versions has
657 * been updated; passed-in buffer filled with
658 * '\n'-terminated C string containing positive
659 * or negative integer values representing the
660 * current status of each protocol version;
661 * return code is the size in bytes of the string
662 * On error: return code is zero or a negative errno value
663 */
664static ssize_t write_versions(struct file *file, char *buf, size_t size)
665{
666 ssize_t rv;
667
668 mutex_lock(&nfsd_mutex);
669 rv = __write_versions(file, buf, size);
670 mutex_unlock(&nfsd_mutex);
671 return rv;
672}
673
674/*
675 * Zero-length write. Return a list of NFSD's current listener
676 * transports.
677 */
678static ssize_t __write_ports_names(char *buf, struct net *net)
679{
680 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
681
682 if (nn->nfsd_serv == NULL)
683 return 0;
684 return svc_xprt_names(nn->nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
685}
686
687/*
688 * A single 'fd' number was written, in which case it must be for
689 * a socket of a supported family/protocol, and we use it as an
690 * nfsd listener.
691 */
692static ssize_t __write_ports_addfd(char *buf, struct net *net)
693{
694 char *mesg = buf;
695 int fd, err;
696 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
697
698 err = get_int(&mesg, &fd);
699 if (err != 0 || fd < 0)
700 return -EINVAL;
701
702 if (svc_alien_sock(net, fd)) {
703 printk(KERN_ERR "%s: socket net is different to NFSd's one\n", __func__);
704 return -EINVAL;
705 }
706
707 err = nfsd_create_serv(net);
708 if (err != 0)
709 return err;
710
711 err = svc_addsock(nn->nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT);
712 if (err < 0) {
713 nfsd_destroy(net);
714 return err;
715 }
716
717 /* Decrease the count, but don't shut down the service */
718 nn->nfsd_serv->sv_nrthreads--;
719 return err;
720}
721
722/*
723 * A transport listener is added by writing it's transport name and
724 * a port number.
725 */
726static ssize_t __write_ports_addxprt(char *buf, struct net *net)
727{
728 char transport[16];
729 struct svc_xprt *xprt;
730 int port, err;
731 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
732
733 if (sscanf(buf, "%15s %5u", transport, &port) != 2)
734 return -EINVAL;
735
736 if (port < 1 || port > USHRT_MAX)
737 return -EINVAL;
738
739 err = nfsd_create_serv(net);
740 if (err != 0)
741 return err;
742
743 err = svc_create_xprt(nn->nfsd_serv, transport, net,
744 PF_INET, port, SVC_SOCK_ANONYMOUS);
745 if (err < 0)
746 goto out_err;
747
748 err = svc_create_xprt(nn->nfsd_serv, transport, net,
749 PF_INET6, port, SVC_SOCK_ANONYMOUS);
750 if (err < 0 && err != -EAFNOSUPPORT)
751 goto out_close;
752
753 /* Decrease the count, but don't shut down the service */
754 nn->nfsd_serv->sv_nrthreads--;
755 return 0;
756out_close:
757 xprt = svc_find_xprt(nn->nfsd_serv, transport, net, PF_INET, port);
758 if (xprt != NULL) {
759 svc_close_xprt(xprt);
760 svc_xprt_put(xprt);
761 }
762out_err:
763 nfsd_destroy(net);
764 return err;
765}
766
767static ssize_t __write_ports(struct file *file, char *buf, size_t size,
768 struct net *net)
769{
770 if (size == 0)
771 return __write_ports_names(buf, net);
772
773 if (isdigit(buf[0]))
774 return __write_ports_addfd(buf, net);
775
776 if (isalpha(buf[0]))
777 return __write_ports_addxprt(buf, net);
778
779 return -EINVAL;
780}
781
782/**
783 * write_ports - Pass a socket file descriptor or transport name to listen on
784 *
785 * Input:
786 * buf: ignored
787 * size: zero
788 * Output:
789 * On success: passed-in buffer filled with a '\n'-terminated C
790 * string containing a whitespace-separated list of
791 * named NFSD listeners;
792 * return code is the size in bytes of the string
793 * On error: return code is zero or a negative errno value
794 *
795 * OR
796 *
797 * Input:
798 * buf: C string containing an unsigned
799 * integer value representing a bound
800 * but unconnected socket that is to be
801 * used as an NFSD listener; listen(3)
802 * must be called for a SOCK_STREAM
803 * socket, otherwise it is ignored
804 * size: non-zero length of C string in @buf
805 * Output:
806 * On success: NFS service is started;
807 * passed-in buffer filled with a '\n'-terminated C
808 * string containing a unique alphanumeric name of
809 * the listener;
810 * return code is the size in bytes of the string
811 * On error: return code is a negative errno value
812 *
813 * OR
814 *
815 * Input:
816 * buf: C string containing a transport
817 * name and an unsigned integer value
818 * representing the port to listen on,
819 * separated by whitespace
820 * size: non-zero length of C string in @buf
821 * Output:
822 * On success: returns zero; NFS service is started
823 * On error: return code is a negative errno value
824 */
825static ssize_t write_ports(struct file *file, char *buf, size_t size)
826{
827 ssize_t rv;
828 struct net *net = file->f_dentry->d_sb->s_fs_info;
829
830 mutex_lock(&nfsd_mutex);
831 rv = __write_ports(file, buf, size, net);
832 mutex_unlock(&nfsd_mutex);
833 return rv;
834}
835
836
837int nfsd_max_blksize;
838
839/**
840 * write_maxblksize - Set or report the current NFS blksize
841 *
842 * Input:
843 * buf: ignored
844 * size: zero
845 *
846 * OR
847 *
848 * Input:
849 * buf: C string containing an unsigned
850 * integer value representing the new
851 * NFS blksize
852 * size: non-zero length of C string in @buf
853 * Output:
854 * On success: passed-in buffer filled with '\n'-terminated C string
855 * containing numeric value of the current NFS blksize
856 * setting;
857 * return code is the size in bytes of the string
858 * On error: return code is zero or a negative errno value
859 */
860static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
861{
862 char *mesg = buf;
863 struct net *net = file->f_dentry->d_sb->s_fs_info;
864 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
865
866 if (size > 0) {
867 int bsize;
868 int rv = get_int(&mesg, &bsize);
869 if (rv)
870 return rv;
871 /* force bsize into allowed range and
872 * required alignment.
873 */
874 if (bsize < 1024)
875 bsize = 1024;
876 if (bsize > NFSSVC_MAXBLKSIZE)
877 bsize = NFSSVC_MAXBLKSIZE;
878 bsize &= ~(1024-1);
879 mutex_lock(&nfsd_mutex);
880 if (nn->nfsd_serv) {
881 mutex_unlock(&nfsd_mutex);
882 return -EBUSY;
883 }
884 nfsd_max_blksize = bsize;
885 mutex_unlock(&nfsd_mutex);
886 }
887
888 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
889 nfsd_max_blksize);
890}
891
892#ifdef CONFIG_NFSD_V4
893static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size,
894 time_t *time, struct nfsd_net *nn)
895{
896 char *mesg = buf;
897 int rv, i;
898
899 if (size > 0) {
900 if (nn->nfsd_serv)
901 return -EBUSY;
902 rv = get_int(&mesg, &i);
903 if (rv)
904 return rv;
905 /*
906 * Some sanity checking. We don't have a reason for
907 * these particular numbers, but problems with the
908 * extremes are:
909 * - Too short: the briefest network outage may
910 * cause clients to lose all their locks. Also,
911 * the frequent polling may be wasteful.
912 * - Too long: do you really want reboot recovery
913 * to take more than an hour? Or to make other
914 * clients wait an hour before being able to
915 * revoke a dead client's locks?
916 */
917 if (i < 10 || i > 3600)
918 return -EINVAL;
919 *time = i;
920 }
921
922 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%ld\n", *time);
923}
924
925static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size,
926 time_t *time, struct nfsd_net *nn)
927{
928 ssize_t rv;
929
930 mutex_lock(&nfsd_mutex);
931 rv = __nfsd4_write_time(file, buf, size, time, nn);
932 mutex_unlock(&nfsd_mutex);
933 return rv;
934}
935
936/**
937 * write_leasetime - Set or report the current NFSv4 lease time
938 *
939 * Input:
940 * buf: ignored
941 * size: zero
942 *
943 * OR
944 *
945 * Input:
946 * buf: C string containing an unsigned
947 * integer value representing the new
948 * NFSv4 lease expiry time
949 * size: non-zero length of C string in @buf
950 * Output:
951 * On success: passed-in buffer filled with '\n'-terminated C
952 * string containing unsigned integer value of the
953 * current lease expiry time;
954 * return code is the size in bytes of the string
955 * On error: return code is zero or a negative errno value
956 */
957static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
958{
959 struct net *net = file->f_dentry->d_sb->s_fs_info;
960 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
961 return nfsd4_write_time(file, buf, size, &nn->nfsd4_lease, nn);
962}
963
964/**
965 * write_gracetime - Set or report current NFSv4 grace period time
966 *
967 * As above, but sets the time of the NFSv4 grace period.
968 *
969 * Note this should never be set to less than the *previous*
970 * lease-period time, but we don't try to enforce this. (In the common
971 * case (a new boot), we don't know what the previous lease time was
972 * anyway.)
973 */
974static ssize_t write_gracetime(struct file *file, char *buf, size_t size)
975{
976 struct net *net = file->f_dentry->d_sb->s_fs_info;
977 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
978 return nfsd4_write_time(file, buf, size, &nn->nfsd4_grace, nn);
979}
980
981static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size,
982 struct nfsd_net *nn)
983{
984 char *mesg = buf;
985 char *recdir;
986 int len, status;
987
988 if (size > 0) {
989 if (nn->nfsd_serv)
990 return -EBUSY;
991 if (size > PATH_MAX || buf[size-1] != '\n')
992 return -EINVAL;
993 buf[size-1] = 0;
994
995 recdir = mesg;
996 len = qword_get(&mesg, recdir, size);
997 if (len <= 0)
998 return -EINVAL;
999
1000 status = nfs4_reset_recoverydir(recdir);
1001 if (status)
1002 return status;
1003 }
1004
1005 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
1006 nfs4_recoverydir());
1007}
1008
1009/**
1010 * write_recoverydir - Set or report the pathname of the recovery directory
1011 *
1012 * Input:
1013 * buf: ignored
1014 * size: zero
1015 *
1016 * OR
1017 *
1018 * Input:
1019 * buf: C string containing the pathname
1020 * of the directory on a local file
1021 * system containing permanent NFSv4
1022 * recovery data
1023 * size: non-zero length of C string in @buf
1024 * Output:
1025 * On success: passed-in buffer filled with '\n'-terminated C string
1026 * containing the current recovery pathname setting;
1027 * return code is the size in bytes of the string
1028 * On error: return code is zero or a negative errno value
1029 */
1030static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
1031{
1032 ssize_t rv;
1033 struct net *net = file->f_dentry->d_sb->s_fs_info;
1034 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1035
1036 mutex_lock(&nfsd_mutex);
1037 rv = __write_recoverydir(file, buf, size, nn);
1038 mutex_unlock(&nfsd_mutex);
1039 return rv;
1040}
1041
1042#endif
1043
1044/*----------------------------------------------------------------------------*/
1045/*
1046 * populating the filesystem.
1047 */
1048
1049static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
1050{
1051 static struct tree_descr nfsd_files[] = {
1052 [NFSD_List] = {"exports", &exports_nfsd_operations, S_IRUGO},
1053 [NFSD_Export_features] = {"export_features",
1054 &export_features_operations, S_IRUGO},
1055 [NFSD_FO_UnlockIP] = {"unlock_ip",
1056 &transaction_ops, S_IWUSR|S_IRUSR},
1057 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1058 &transaction_ops, S_IWUSR|S_IRUSR},
1059 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1060 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1061 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1062 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1063 [NFSD_Reply_Cache_Stats] = {"reply_cache_stats", &reply_cache_stats_operations, S_IRUGO},
1064 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1065 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1066 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1067#if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
1068 [NFSD_SupportedEnctypes] = {"supported_krb5_enctypes", &supported_enctypes_ops, S_IRUGO},
1069#endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
1070#ifdef CONFIG_NFSD_V4
1071 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1072 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
1073 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1074#endif
1075 /* last one */ {""}
1076 };
1077 struct net *net = data;
1078 int ret;
1079
1080 ret = simple_fill_super(sb, 0x6e667364, nfsd_files);
1081 if (ret)
1082 return ret;
1083 sb->s_fs_info = get_net(net);
1084 return 0;
1085}
1086
1087static struct dentry *nfsd_mount(struct file_system_type *fs_type,
1088 int flags, const char *dev_name, void *data)
1089{
1090 return mount_ns(fs_type, flags, current->nsproxy->net_ns, nfsd_fill_super);
1091}
1092
1093static void nfsd_umount(struct super_block *sb)
1094{
1095 struct net *net = sb->s_fs_info;
1096
1097 kill_litter_super(sb);
1098 put_net(net);
1099}
1100
1101static struct file_system_type nfsd_fs_type = {
1102 .owner = THIS_MODULE,
1103 .name = "nfsd",
1104 .mount = nfsd_mount,
1105 .kill_sb = nfsd_umount,
1106};
1107MODULE_ALIAS_FS("nfsd");
1108
1109#ifdef CONFIG_PROC_FS
1110static int create_proc_exports_entry(void)
1111{
1112 struct proc_dir_entry *entry;
1113
1114 entry = proc_mkdir("fs/nfs", NULL);
1115 if (!entry)
1116 return -ENOMEM;
1117 entry = proc_create("exports", 0, entry,
1118 &exports_proc_operations);
1119 if (!entry) {
1120 remove_proc_entry("fs/nfs", NULL);
1121 return -ENOMEM;
1122 }
1123 return 0;
1124}
1125#else /* CONFIG_PROC_FS */
1126static int create_proc_exports_entry(void)
1127{
1128 return 0;
1129}
1130#endif
1131
1132int nfsd_net_id;
1133
1134static __net_init int nfsd_init_net(struct net *net)
1135{
1136 int retval;
1137 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1138
1139 retval = nfsd_export_init(net);
1140 if (retval)
1141 goto out_export_error;
1142 retval = nfsd_idmap_init(net);
1143 if (retval)
1144 goto out_idmap_error;
1145 nn->nfsd4_lease = 90; /* default lease time */
1146 nn->nfsd4_grace = 90;
1147 return 0;
1148
1149out_idmap_error:
1150 nfsd_export_shutdown(net);
1151out_export_error:
1152 return retval;
1153}
1154
1155static __net_exit void nfsd_exit_net(struct net *net)
1156{
1157 nfsd_idmap_shutdown(net);
1158 nfsd_export_shutdown(net);
1159}
1160
1161static struct pernet_operations nfsd_net_ops = {
1162 .init = nfsd_init_net,
1163 .exit = nfsd_exit_net,
1164 .id = &nfsd_net_id,
1165 .size = sizeof(struct nfsd_net),
1166};
1167
1168static int __init init_nfsd(void)
1169{
1170 int retval;
1171 printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
1172
1173 retval = register_cld_notifier();
1174 if (retval)
1175 return retval;
1176 retval = register_pernet_subsys(&nfsd_net_ops);
1177 if (retval < 0)
1178 goto out_unregister_notifier;
1179 retval = nfsd4_init_slabs();
1180 if (retval)
1181 goto out_unregister_pernet;
1182 nfs4_state_init();
1183 retval = nfsd_fault_inject_init(); /* nfsd fault injection controls */
1184 if (retval)
1185 goto out_free_slabs;
1186 nfsd_stat_init(); /* Statistics */
1187 retval = nfsd_reply_cache_init();
1188 if (retval)
1189 goto out_free_stat;
1190 nfsd_lockd_init(); /* lockd->nfsd callbacks */
1191 retval = create_proc_exports_entry();
1192 if (retval)
1193 goto out_free_lockd;
1194 retval = register_filesystem(&nfsd_fs_type);
1195 if (retval)
1196 goto out_free_all;
1197 return 0;
1198out_free_all:
1199 remove_proc_entry("fs/nfs/exports", NULL);
1200 remove_proc_entry("fs/nfs", NULL);
1201out_free_lockd:
1202 nfsd_lockd_shutdown();
1203 nfsd_reply_cache_shutdown();
1204out_free_stat:
1205 nfsd_stat_shutdown();
1206 nfsd_fault_inject_cleanup();
1207out_free_slabs:
1208 nfsd4_free_slabs();
1209out_unregister_pernet:
1210 unregister_pernet_subsys(&nfsd_net_ops);
1211out_unregister_notifier:
1212 unregister_cld_notifier();
1213 return retval;
1214}
1215
1216static void __exit exit_nfsd(void)
1217{
1218 nfsd_reply_cache_shutdown();
1219 remove_proc_entry("fs/nfs/exports", NULL);
1220 remove_proc_entry("fs/nfs", NULL);
1221 nfsd_stat_shutdown();
1222 nfsd_lockd_shutdown();
1223 nfsd4_free_slabs();
1224 nfsd_fault_inject_cleanup();
1225 unregister_filesystem(&nfsd_fs_type);
1226 unregister_pernet_subsys(&nfsd_net_ops);
1227 unregister_cld_notifier();
1228}
1229
1230MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1231MODULE_LICENSE("GPL");
1232module_init(init_nfsd)
1233module_exit(exit_nfsd)
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Syscall interface to knfsd.
4 *
5 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
6 */
7
8#include <linux/slab.h>
9#include <linux/namei.h>
10#include <linux/ctype.h>
11#include <linux/fs_context.h>
12
13#include <linux/sunrpc/svcsock.h>
14#include <linux/lockd/lockd.h>
15#include <linux/sunrpc/addr.h>
16#include <linux/sunrpc/gss_api.h>
17#include <linux/sunrpc/rpc_pipe_fs.h>
18#include <linux/module.h>
19#include <linux/fsnotify.h>
20
21#include "idmap.h"
22#include "nfsd.h"
23#include "cache.h"
24#include "state.h"
25#include "netns.h"
26#include "pnfs.h"
27#include "filecache.h"
28#include "trace.h"
29#include "netlink.h"
30
31/*
32 * We have a single directory with several nodes in it.
33 */
34enum {
35 NFSD_Root = 1,
36 NFSD_List,
37 NFSD_Export_Stats,
38 NFSD_Export_features,
39 NFSD_Fh,
40 NFSD_FO_UnlockIP,
41 NFSD_FO_UnlockFS,
42 NFSD_Threads,
43 NFSD_Pool_Threads,
44 NFSD_Pool_Stats,
45 NFSD_Reply_Cache_Stats,
46 NFSD_Versions,
47 NFSD_Ports,
48 NFSD_MaxBlkSize,
49 NFSD_MaxConnections,
50 NFSD_Filecache,
51 NFSD_Leasetime,
52 NFSD_Gracetime,
53 NFSD_RecoveryDir,
54 NFSD_V4EndGrace,
55 NFSD_MaxReserved
56};
57
58/*
59 * write() for these nodes.
60 */
61static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
62static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size);
63static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size);
64static ssize_t write_threads(struct file *file, char *buf, size_t size);
65static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
66static ssize_t write_versions(struct file *file, char *buf, size_t size);
67static ssize_t write_ports(struct file *file, char *buf, size_t size);
68static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
69static ssize_t write_maxconn(struct file *file, char *buf, size_t size);
70#ifdef CONFIG_NFSD_V4
71static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
72static ssize_t write_gracetime(struct file *file, char *buf, size_t size);
73#ifdef CONFIG_NFSD_LEGACY_CLIENT_TRACKING
74static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
75#endif
76static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size);
77#endif
78
79static ssize_t (*const write_op[])(struct file *, char *, size_t) = {
80 [NFSD_Fh] = write_filehandle,
81 [NFSD_FO_UnlockIP] = write_unlock_ip,
82 [NFSD_FO_UnlockFS] = write_unlock_fs,
83 [NFSD_Threads] = write_threads,
84 [NFSD_Pool_Threads] = write_pool_threads,
85 [NFSD_Versions] = write_versions,
86 [NFSD_Ports] = write_ports,
87 [NFSD_MaxBlkSize] = write_maxblksize,
88 [NFSD_MaxConnections] = write_maxconn,
89#ifdef CONFIG_NFSD_V4
90 [NFSD_Leasetime] = write_leasetime,
91 [NFSD_Gracetime] = write_gracetime,
92#ifdef CONFIG_NFSD_LEGACY_CLIENT_TRACKING
93 [NFSD_RecoveryDir] = write_recoverydir,
94#endif
95 [NFSD_V4EndGrace] = write_v4_end_grace,
96#endif
97};
98
99static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
100{
101 ino_t ino = file_inode(file)->i_ino;
102 char *data;
103 ssize_t rv;
104
105 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
106 return -EINVAL;
107
108 data = simple_transaction_get(file, buf, size);
109 if (IS_ERR(data))
110 return PTR_ERR(data);
111
112 rv = write_op[ino](file, data, size);
113 if (rv < 0)
114 return rv;
115
116 simple_transaction_set(file, rv);
117 return size;
118}
119
120static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
121{
122 if (! file->private_data) {
123 /* An attempt to read a transaction file without writing
124 * causes a 0-byte write so that the file can return
125 * state information
126 */
127 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
128 if (rv < 0)
129 return rv;
130 }
131 return simple_transaction_read(file, buf, size, pos);
132}
133
134static const struct file_operations transaction_ops = {
135 .write = nfsctl_transaction_write,
136 .read = nfsctl_transaction_read,
137 .release = simple_transaction_release,
138 .llseek = default_llseek,
139};
140
141static int exports_net_open(struct net *net, struct file *file)
142{
143 int err;
144 struct seq_file *seq;
145 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
146
147 err = seq_open(file, &nfs_exports_op);
148 if (err)
149 return err;
150
151 seq = file->private_data;
152 seq->private = nn->svc_export_cache;
153 return 0;
154}
155
156static int exports_nfsd_open(struct inode *inode, struct file *file)
157{
158 return exports_net_open(inode->i_sb->s_fs_info, file);
159}
160
161static const struct file_operations exports_nfsd_operations = {
162 .open = exports_nfsd_open,
163 .read = seq_read,
164 .llseek = seq_lseek,
165 .release = seq_release,
166};
167
168static int export_features_show(struct seq_file *m, void *v)
169{
170 seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS);
171 return 0;
172}
173
174DEFINE_SHOW_ATTRIBUTE(export_features);
175
176static const struct file_operations pool_stats_operations = {
177 .open = nfsd_pool_stats_open,
178 .read = seq_read,
179 .llseek = seq_lseek,
180 .release = seq_release,
181};
182
183DEFINE_SHOW_ATTRIBUTE(nfsd_reply_cache_stats);
184
185DEFINE_SHOW_ATTRIBUTE(nfsd_file_cache_stats);
186
187/*----------------------------------------------------------------------------*/
188/*
189 * payload - write methods
190 */
191
192static inline struct net *netns(struct file *file)
193{
194 return file_inode(file)->i_sb->s_fs_info;
195}
196
197/*
198 * write_unlock_ip - Release all locks used by a client
199 *
200 * Experimental.
201 *
202 * Input:
203 * buf: '\n'-terminated C string containing a
204 * presentation format IP address
205 * size: length of C string in @buf
206 * Output:
207 * On success: returns zero if all specified locks were released;
208 * returns one if one or more locks were not released
209 * On error: return code is negative errno value
210 */
211static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
212{
213 struct sockaddr_storage address;
214 struct sockaddr *sap = (struct sockaddr *)&address;
215 size_t salen = sizeof(address);
216 char *fo_path;
217 struct net *net = netns(file);
218
219 /* sanity check */
220 if (size == 0)
221 return -EINVAL;
222
223 if (buf[size-1] != '\n')
224 return -EINVAL;
225
226 fo_path = buf;
227 if (qword_get(&buf, fo_path, size) < 0)
228 return -EINVAL;
229
230 if (rpc_pton(net, fo_path, size, sap, salen) == 0)
231 return -EINVAL;
232
233 trace_nfsd_ctl_unlock_ip(net, buf);
234 return nlmsvc_unlock_all_by_ip(sap);
235}
236
237/*
238 * write_unlock_fs - Release all locks on a local file system
239 *
240 * Experimental.
241 *
242 * Input:
243 * buf: '\n'-terminated C string containing the
244 * absolute pathname of a local file system
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_fs(struct file *file, char *buf, size_t size)
252{
253 struct path path;
254 char *fo_path;
255 int error;
256
257 /* sanity check */
258 if (size == 0)
259 return -EINVAL;
260
261 if (buf[size-1] != '\n')
262 return -EINVAL;
263
264 fo_path = buf;
265 if (qword_get(&buf, fo_path, size) < 0)
266 return -EINVAL;
267 trace_nfsd_ctl_unlock_fs(netns(file), fo_path);
268 error = kern_path(fo_path, 0, &path);
269 if (error)
270 return error;
271
272 /*
273 * XXX: Needs better sanity checking. Otherwise we could end up
274 * releasing locks on the wrong file system.
275 *
276 * For example:
277 * 1. Does the path refer to a directory?
278 * 2. Is that directory a mount point, or
279 * 3. Is that directory the root of an exported file system?
280 */
281 error = nlmsvc_unlock_all_by_sb(path.dentry->d_sb);
282 nfsd4_revoke_states(netns(file), path.dentry->d_sb);
283
284 path_put(&path);
285 return error;
286}
287
288/*
289 * write_filehandle - Get a variable-length NFS file handle by path
290 *
291 * On input, the buffer contains a '\n'-terminated C string comprised of
292 * three alphanumeric words separated by whitespace. The string may
293 * contain escape sequences.
294 *
295 * Input:
296 * buf:
297 * domain: client domain name
298 * path: export pathname
299 * maxsize: numeric maximum size of
300 * @buf
301 * size: length of C string in @buf
302 * Output:
303 * On success: passed-in buffer filled with '\n'-terminated C
304 * string containing a ASCII hex text version
305 * of the NFS file handle;
306 * return code is the size in bytes of the string
307 * On error: return code is negative errno value
308 */
309static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
310{
311 char *dname, *path;
312 int maxsize;
313 char *mesg = buf;
314 int len;
315 struct auth_domain *dom;
316 struct knfsd_fh fh;
317
318 if (size == 0)
319 return -EINVAL;
320
321 if (buf[size-1] != '\n')
322 return -EINVAL;
323 buf[size-1] = 0;
324
325 dname = mesg;
326 len = qword_get(&mesg, dname, size);
327 if (len <= 0)
328 return -EINVAL;
329
330 path = dname+len+1;
331 len = qword_get(&mesg, path, size);
332 if (len <= 0)
333 return -EINVAL;
334
335 len = get_int(&mesg, &maxsize);
336 if (len)
337 return len;
338
339 if (maxsize < NFS_FHSIZE)
340 return -EINVAL;
341 maxsize = min(maxsize, NFS3_FHSIZE);
342
343 if (qword_get(&mesg, mesg, size) > 0)
344 return -EINVAL;
345
346 trace_nfsd_ctl_filehandle(netns(file), dname, path, maxsize);
347
348 /* we have all the words, they are in buf.. */
349 dom = unix_domain_find(dname);
350 if (!dom)
351 return -ENOMEM;
352
353 len = exp_rootfh(netns(file), dom, path, &fh, maxsize);
354 auth_domain_put(dom);
355 if (len)
356 return len;
357
358 mesg = buf;
359 len = SIMPLE_TRANSACTION_LIMIT;
360 qword_addhex(&mesg, &len, fh.fh_raw, fh.fh_size);
361 mesg[-1] = '\n';
362 return mesg - buf;
363}
364
365/*
366 * write_threads - Start NFSD, or report the current number of running threads
367 *
368 * Input:
369 * buf: ignored
370 * size: zero
371 * Output:
372 * On success: passed-in buffer filled with '\n'-terminated C
373 * string numeric value representing the number of
374 * running NFSD threads;
375 * return code is the size in bytes of the string
376 * On error: return code is zero
377 *
378 * OR
379 *
380 * Input:
381 * buf: C string containing an unsigned
382 * integer value representing the
383 * number of NFSD threads to start
384 * size: non-zero length of C string in @buf
385 * Output:
386 * On success: NFS service is started;
387 * passed-in buffer filled with '\n'-terminated C
388 * string numeric value representing the number of
389 * running NFSD threads;
390 * return code is the size in bytes of the string
391 * On error: return code is zero or a negative errno value
392 */
393static ssize_t write_threads(struct file *file, char *buf, size_t size)
394{
395 char *mesg = buf;
396 int rv;
397 struct net *net = netns(file);
398
399 if (size > 0) {
400 int newthreads;
401 rv = get_int(&mesg, &newthreads);
402 if (rv)
403 return rv;
404 if (newthreads < 0)
405 return -EINVAL;
406 trace_nfsd_ctl_threads(net, newthreads);
407 rv = nfsd_svc(newthreads, net, file->f_cred);
408 if (rv < 0)
409 return rv;
410 } else
411 rv = nfsd_nrthreads(net);
412
413 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
414}
415
416/*
417 * write_pool_threads - Set or report the current number of threads per pool
418 *
419 * Input:
420 * buf: ignored
421 * size: zero
422 *
423 * OR
424 *
425 * Input:
426 * buf: C string containing whitespace-
427 * separated unsigned integer values
428 * representing the number of NFSD
429 * threads to start in each pool
430 * size: non-zero length of C string in @buf
431 * Output:
432 * On success: passed-in buffer filled with '\n'-terminated C
433 * string containing integer values representing the
434 * number of NFSD threads in each pool;
435 * return code is the size in bytes of the string
436 * On error: return code is zero or a negative errno value
437 */
438static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
439{
440 /* if size > 0, look for an array of number of threads per node
441 * and apply them then write out number of threads per node as reply
442 */
443 char *mesg = buf;
444 int i;
445 int rv;
446 int len;
447 int npools;
448 int *nthreads;
449 struct net *net = netns(file);
450
451 mutex_lock(&nfsd_mutex);
452 npools = nfsd_nrpools(net);
453 if (npools == 0) {
454 /*
455 * NFS is shut down. The admin can start it by
456 * writing to the threads file but NOT the pool_threads
457 * file, sorry. Report zero threads.
458 */
459 mutex_unlock(&nfsd_mutex);
460 strcpy(buf, "0\n");
461 return strlen(buf);
462 }
463
464 nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
465 rv = -ENOMEM;
466 if (nthreads == NULL)
467 goto out_free;
468
469 if (size > 0) {
470 for (i = 0; i < npools; i++) {
471 rv = get_int(&mesg, &nthreads[i]);
472 if (rv == -ENOENT)
473 break; /* fewer numbers than pools */
474 if (rv)
475 goto out_free; /* syntax error */
476 rv = -EINVAL;
477 if (nthreads[i] < 0)
478 goto out_free;
479 trace_nfsd_ctl_pool_threads(net, i, nthreads[i]);
480 }
481 rv = nfsd_set_nrthreads(i, nthreads, net);
482 if (rv)
483 goto out_free;
484 }
485
486 rv = nfsd_get_nrthreads(npools, nthreads, net);
487 if (rv)
488 goto out_free;
489
490 mesg = buf;
491 size = SIMPLE_TRANSACTION_LIMIT;
492 for (i = 0; i < npools && size > 0; i++) {
493 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
494 len = strlen(mesg);
495 size -= len;
496 mesg += len;
497 }
498 rv = mesg - buf;
499out_free:
500 kfree(nthreads);
501 mutex_unlock(&nfsd_mutex);
502 return rv;
503}
504
505static ssize_t
506nfsd_print_version_support(struct nfsd_net *nn, char *buf, int remaining,
507 const char *sep, unsigned vers, int minor)
508{
509 const char *format = minor < 0 ? "%s%c%u" : "%s%c%u.%u";
510 bool supported = !!nfsd_vers(nn, vers, NFSD_TEST);
511
512 if (vers == 4 && minor >= 0 &&
513 !nfsd_minorversion(nn, minor, NFSD_TEST))
514 supported = false;
515 if (minor == 0 && supported)
516 /*
517 * special case for backward compatability.
518 * +4.0 is never reported, it is implied by
519 * +4, unless -4.0 is present.
520 */
521 return 0;
522 return snprintf(buf, remaining, format, sep,
523 supported ? '+' : '-', vers, minor);
524}
525
526static ssize_t __write_versions(struct file *file, char *buf, size_t size)
527{
528 char *mesg = buf;
529 char *vers, *minorp, sign;
530 int len, num, remaining;
531 ssize_t tlen = 0;
532 char *sep;
533 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
534
535 if (size > 0) {
536 if (nn->nfsd_serv)
537 /* Cannot change versions without updating
538 * nn->nfsd_serv->sv_xdrsize, and reallocing
539 * rq_argp and rq_resp
540 */
541 return -EBUSY;
542 if (buf[size-1] != '\n')
543 return -EINVAL;
544 buf[size-1] = 0;
545 trace_nfsd_ctl_version(netns(file), buf);
546
547 vers = mesg;
548 len = qword_get(&mesg, vers, size);
549 if (len <= 0) return -EINVAL;
550 do {
551 enum vers_op cmd;
552 unsigned minor;
553 sign = *vers;
554 if (sign == '+' || sign == '-')
555 num = simple_strtol((vers+1), &minorp, 0);
556 else
557 num = simple_strtol(vers, &minorp, 0);
558 if (*minorp == '.') {
559 if (num != 4)
560 return -EINVAL;
561 if (kstrtouint(minorp+1, 0, &minor) < 0)
562 return -EINVAL;
563 }
564
565 cmd = sign == '-' ? NFSD_CLEAR : NFSD_SET;
566 switch(num) {
567#ifdef CONFIG_NFSD_V2
568 case 2:
569#endif
570 case 3:
571 nfsd_vers(nn, num, cmd);
572 break;
573 case 4:
574 if (*minorp == '.') {
575 if (nfsd_minorversion(nn, minor, cmd) < 0)
576 return -EINVAL;
577 } else if ((cmd == NFSD_SET) != nfsd_vers(nn, num, NFSD_TEST)) {
578 /*
579 * Either we have +4 and no minors are enabled,
580 * or we have -4 and at least one minor is enabled.
581 * In either case, propagate 'cmd' to all minors.
582 */
583 minor = 0;
584 while (nfsd_minorversion(nn, minor, cmd) >= 0)
585 minor++;
586 }
587 break;
588 default:
589 /* Ignore requests to disable non-existent versions */
590 if (cmd == NFSD_SET)
591 return -EINVAL;
592 }
593 vers += len + 1;
594 } while ((len = qword_get(&mesg, vers, size)) > 0);
595 /* If all get turned off, turn them back on, as
596 * having no versions is BAD
597 */
598 nfsd_reset_versions(nn);
599 }
600
601 /* Now write current state into reply buffer */
602 sep = "";
603 remaining = SIMPLE_TRANSACTION_LIMIT;
604 for (num=2 ; num <= 4 ; num++) {
605 int minor;
606 if (!nfsd_vers(nn, num, NFSD_AVAIL))
607 continue;
608
609 minor = -1;
610 do {
611 len = nfsd_print_version_support(nn, buf, remaining,
612 sep, num, minor);
613 if (len >= remaining)
614 goto out;
615 remaining -= len;
616 buf += len;
617 tlen += len;
618 minor++;
619 if (len)
620 sep = " ";
621 } while (num == 4 && minor <= NFSD_SUPPORTED_MINOR_VERSION);
622 }
623out:
624 len = snprintf(buf, remaining, "\n");
625 if (len >= remaining)
626 return -EINVAL;
627 return tlen + len;
628}
629
630/*
631 * write_versions - Set or report the available NFS protocol versions
632 *
633 * Input:
634 * buf: ignored
635 * size: zero
636 * Output:
637 * On success: passed-in buffer filled with '\n'-terminated C
638 * string containing positive or negative integer
639 * values representing the current status of each
640 * protocol version;
641 * return code is the size in bytes of the string
642 * On error: return code is zero or a negative errno value
643 *
644 * OR
645 *
646 * Input:
647 * buf: C string containing whitespace-
648 * separated positive or negative
649 * integer values representing NFS
650 * protocol versions to enable ("+n")
651 * or disable ("-n")
652 * size: non-zero length of C string in @buf
653 * Output:
654 * On success: status of zero or more protocol versions has
655 * been updated; passed-in buffer filled with
656 * '\n'-terminated C string containing positive
657 * or negative integer values representing the
658 * current status of each protocol version;
659 * return code is the size in bytes of the string
660 * On error: return code is zero or a negative errno value
661 */
662static ssize_t write_versions(struct file *file, char *buf, size_t size)
663{
664 ssize_t rv;
665
666 mutex_lock(&nfsd_mutex);
667 rv = __write_versions(file, buf, size);
668 mutex_unlock(&nfsd_mutex);
669 return rv;
670}
671
672/*
673 * Zero-length write. Return a list of NFSD's current listener
674 * transports.
675 */
676static ssize_t __write_ports_names(char *buf, struct net *net)
677{
678 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
679
680 if (nn->nfsd_serv == NULL)
681 return 0;
682 return svc_xprt_names(nn->nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
683}
684
685/*
686 * A single 'fd' number was written, in which case it must be for
687 * a socket of a supported family/protocol, and we use it as an
688 * nfsd listener.
689 */
690static ssize_t __write_ports_addfd(char *buf, struct net *net, const struct cred *cred)
691{
692 char *mesg = buf;
693 int fd, err;
694 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
695 struct svc_serv *serv;
696
697 err = get_int(&mesg, &fd);
698 if (err != 0 || fd < 0)
699 return -EINVAL;
700 trace_nfsd_ctl_ports_addfd(net, fd);
701
702 err = nfsd_create_serv(net);
703 if (err != 0)
704 return err;
705
706 serv = nn->nfsd_serv;
707 err = svc_addsock(serv, net, fd, buf, SIMPLE_TRANSACTION_LIMIT, cred);
708
709 if (!serv->sv_nrthreads && list_empty(&nn->nfsd_serv->sv_permsocks))
710 nfsd_destroy_serv(net);
711
712 return err;
713}
714
715/*
716 * A transport listener is added by writing its transport name and
717 * a port number.
718 */
719static ssize_t __write_ports_addxprt(char *buf, struct net *net, const struct cred *cred)
720{
721 char transport[16];
722 struct svc_xprt *xprt;
723 int port, err;
724 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
725 struct svc_serv *serv;
726
727 if (sscanf(buf, "%15s %5u", transport, &port) != 2)
728 return -EINVAL;
729
730 if (port < 1 || port > USHRT_MAX)
731 return -EINVAL;
732 trace_nfsd_ctl_ports_addxprt(net, transport, port);
733
734 err = nfsd_create_serv(net);
735 if (err != 0)
736 return err;
737
738 serv = nn->nfsd_serv;
739 err = svc_xprt_create(serv, transport, net,
740 PF_INET, port, SVC_SOCK_ANONYMOUS, cred);
741 if (err < 0)
742 goto out_err;
743
744 err = svc_xprt_create(serv, transport, net,
745 PF_INET6, port, SVC_SOCK_ANONYMOUS, cred);
746 if (err < 0 && err != -EAFNOSUPPORT)
747 goto out_close;
748
749 return 0;
750out_close:
751 xprt = svc_find_xprt(serv, transport, net, PF_INET, port);
752 if (xprt != NULL) {
753 svc_xprt_close(xprt);
754 svc_xprt_put(xprt);
755 }
756out_err:
757 if (!serv->sv_nrthreads && list_empty(&nn->nfsd_serv->sv_permsocks))
758 nfsd_destroy_serv(net);
759
760 return err;
761}
762
763static ssize_t __write_ports(struct file *file, char *buf, size_t size,
764 struct net *net)
765{
766 if (size == 0)
767 return __write_ports_names(buf, net);
768
769 if (isdigit(buf[0]))
770 return __write_ports_addfd(buf, net, file->f_cred);
771
772 if (isalpha(buf[0]))
773 return __write_ports_addxprt(buf, net, file->f_cred);
774
775 return -EINVAL;
776}
777
778/*
779 * write_ports - Pass a socket file descriptor or transport name to listen on
780 *
781 * Input:
782 * buf: ignored
783 * size: zero
784 * Output:
785 * On success: passed-in buffer filled with a '\n'-terminated C
786 * string containing a whitespace-separated list of
787 * named NFSD listeners;
788 * return code is the size in bytes of the string
789 * On error: return code is zero or a negative errno value
790 *
791 * OR
792 *
793 * Input:
794 * buf: C string containing an unsigned
795 * integer value representing a bound
796 * but unconnected socket that is to be
797 * used as an NFSD listener; listen(3)
798 * must be called for a SOCK_STREAM
799 * socket, otherwise it is ignored
800 * size: non-zero length of C string in @buf
801 * Output:
802 * On success: NFS service is started;
803 * passed-in buffer filled with a '\n'-terminated C
804 * string containing a unique alphanumeric name of
805 * the listener;
806 * return code is the size in bytes of the string
807 * On error: return code is a negative errno value
808 *
809 * OR
810 *
811 * Input:
812 * buf: C string containing a transport
813 * name and an unsigned integer value
814 * representing the port to listen on,
815 * separated by whitespace
816 * size: non-zero length of C string in @buf
817 * Output:
818 * On success: returns zero; NFS service is started
819 * On error: return code is a negative errno value
820 */
821static ssize_t write_ports(struct file *file, char *buf, size_t size)
822{
823 ssize_t rv;
824
825 mutex_lock(&nfsd_mutex);
826 rv = __write_ports(file, buf, size, netns(file));
827 mutex_unlock(&nfsd_mutex);
828 return rv;
829}
830
831
832int nfsd_max_blksize;
833
834/*
835 * write_maxblksize - Set or report the current NFS blksize
836 *
837 * Input:
838 * buf: ignored
839 * size: zero
840 *
841 * OR
842 *
843 * Input:
844 * buf: C string containing an unsigned
845 * integer value representing the new
846 * NFS blksize
847 * size: non-zero length of C string in @buf
848 * Output:
849 * On success: passed-in buffer filled with '\n'-terminated C string
850 * containing numeric value of the current NFS blksize
851 * setting;
852 * return code is the size in bytes of the string
853 * On error: return code is zero or a negative errno value
854 */
855static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
856{
857 char *mesg = buf;
858 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
859
860 if (size > 0) {
861 int bsize;
862 int rv = get_int(&mesg, &bsize);
863 if (rv)
864 return rv;
865 trace_nfsd_ctl_maxblksize(netns(file), bsize);
866
867 /* force bsize into allowed range and
868 * required alignment.
869 */
870 bsize = max_t(int, bsize, 1024);
871 bsize = min_t(int, bsize, NFSSVC_MAXBLKSIZE);
872 bsize &= ~(1024-1);
873 mutex_lock(&nfsd_mutex);
874 if (nn->nfsd_serv) {
875 mutex_unlock(&nfsd_mutex);
876 return -EBUSY;
877 }
878 nfsd_max_blksize = bsize;
879 mutex_unlock(&nfsd_mutex);
880 }
881
882 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
883 nfsd_max_blksize);
884}
885
886/*
887 * write_maxconn - Set or report the current max number of connections
888 *
889 * Input:
890 * buf: ignored
891 * size: zero
892 * OR
893 *
894 * Input:
895 * buf: C string containing an unsigned
896 * integer value representing the new
897 * number of max connections
898 * size: non-zero length of C string in @buf
899 * Output:
900 * On success: passed-in buffer filled with '\n'-terminated C string
901 * containing numeric value of max_connections setting
902 * for this net namespace;
903 * return code is the size in bytes of the string
904 * On error: return code is zero or a negative errno value
905 */
906static ssize_t write_maxconn(struct file *file, char *buf, size_t size)
907{
908 char *mesg = buf;
909 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
910 unsigned int maxconn = nn->max_connections;
911
912 if (size > 0) {
913 int rv = get_uint(&mesg, &maxconn);
914
915 if (rv)
916 return rv;
917 trace_nfsd_ctl_maxconn(netns(file), maxconn);
918 nn->max_connections = maxconn;
919 }
920
921 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%u\n", maxconn);
922}
923
924#ifdef CONFIG_NFSD_V4
925static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size,
926 time64_t *time, struct nfsd_net *nn)
927{
928 struct dentry *dentry = file_dentry(file);
929 char *mesg = buf;
930 int rv, i;
931
932 if (size > 0) {
933 if (nn->nfsd_serv)
934 return -EBUSY;
935 rv = get_int(&mesg, &i);
936 if (rv)
937 return rv;
938 trace_nfsd_ctl_time(netns(file), dentry->d_name.name,
939 dentry->d_name.len, i);
940
941 /*
942 * Some sanity checking. We don't have a reason for
943 * these particular numbers, but problems with the
944 * extremes are:
945 * - Too short: the briefest network outage may
946 * cause clients to lose all their locks. Also,
947 * the frequent polling may be wasteful.
948 * - Too long: do you really want reboot recovery
949 * to take more than an hour? Or to make other
950 * clients wait an hour before being able to
951 * revoke a dead client's locks?
952 */
953 if (i < 10 || i > 3600)
954 return -EINVAL;
955 *time = i;
956 }
957
958 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%lld\n", *time);
959}
960
961static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size,
962 time64_t *time, struct nfsd_net *nn)
963{
964 ssize_t rv;
965
966 mutex_lock(&nfsd_mutex);
967 rv = __nfsd4_write_time(file, buf, size, time, nn);
968 mutex_unlock(&nfsd_mutex);
969 return rv;
970}
971
972/*
973 * write_leasetime - Set or report the current NFSv4 lease time
974 *
975 * Input:
976 * buf: ignored
977 * size: zero
978 *
979 * OR
980 *
981 * Input:
982 * buf: C string containing an unsigned
983 * integer value representing the new
984 * NFSv4 lease expiry time
985 * size: non-zero length of C string in @buf
986 * Output:
987 * On success: passed-in buffer filled with '\n'-terminated C
988 * string containing unsigned integer value of the
989 * current lease expiry time;
990 * return code is the size in bytes of the string
991 * On error: return code is zero or a negative errno value
992 */
993static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
994{
995 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
996 return nfsd4_write_time(file, buf, size, &nn->nfsd4_lease, nn);
997}
998
999/*
1000 * write_gracetime - Set or report current NFSv4 grace period time
1001 *
1002 * As above, but sets the time of the NFSv4 grace period.
1003 *
1004 * Note this should never be set to less than the *previous*
1005 * lease-period time, but we don't try to enforce this. (In the common
1006 * case (a new boot), we don't know what the previous lease time was
1007 * anyway.)
1008 */
1009static ssize_t write_gracetime(struct file *file, char *buf, size_t size)
1010{
1011 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1012 return nfsd4_write_time(file, buf, size, &nn->nfsd4_grace, nn);
1013}
1014
1015#ifdef CONFIG_NFSD_LEGACY_CLIENT_TRACKING
1016static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size,
1017 struct nfsd_net *nn)
1018{
1019 char *mesg = buf;
1020 char *recdir;
1021 int len, status;
1022
1023 if (size > 0) {
1024 if (nn->nfsd_serv)
1025 return -EBUSY;
1026 if (size > PATH_MAX || buf[size-1] != '\n')
1027 return -EINVAL;
1028 buf[size-1] = 0;
1029
1030 recdir = mesg;
1031 len = qword_get(&mesg, recdir, size);
1032 if (len <= 0)
1033 return -EINVAL;
1034 trace_nfsd_ctl_recoverydir(netns(file), recdir);
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#endif
1077
1078/*
1079 * write_v4_end_grace - release grace period for nfsd's v4.x lock manager
1080 *
1081 * Input:
1082 * buf: ignored
1083 * size: zero
1084 * OR
1085 *
1086 * Input:
1087 * buf: any value
1088 * size: non-zero length of C string in @buf
1089 * Output:
1090 * passed-in buffer filled with "Y" or "N" with a newline
1091 * and NULL-terminated C string. This indicates whether
1092 * the grace period has ended in the current net
1093 * namespace. Return code is the size in bytes of the
1094 * string. Writing a string that starts with 'Y', 'y', or
1095 * '1' to the file will end the grace period for nfsd's v4
1096 * lock manager.
1097 */
1098static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size)
1099{
1100 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1101
1102 if (size > 0) {
1103 switch(buf[0]) {
1104 case 'Y':
1105 case 'y':
1106 case '1':
1107 if (!nn->nfsd_serv)
1108 return -EBUSY;
1109 trace_nfsd_end_grace(netns(file));
1110 nfsd4_end_grace(nn);
1111 break;
1112 default:
1113 return -EINVAL;
1114 }
1115 }
1116
1117 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%c\n",
1118 nn->grace_ended ? 'Y' : 'N');
1119}
1120
1121#endif
1122
1123/*----------------------------------------------------------------------------*/
1124/*
1125 * populating the filesystem.
1126 */
1127
1128/* Basically copying rpc_get_inode. */
1129static struct inode *nfsd_get_inode(struct super_block *sb, umode_t mode)
1130{
1131 struct inode *inode = new_inode(sb);
1132 if (!inode)
1133 return NULL;
1134 /* Following advice from simple_fill_super documentation: */
1135 inode->i_ino = iunique(sb, NFSD_MaxReserved);
1136 inode->i_mode = mode;
1137 simple_inode_init_ts(inode);
1138 switch (mode & S_IFMT) {
1139 case S_IFDIR:
1140 inode->i_fop = &simple_dir_operations;
1141 inode->i_op = &simple_dir_inode_operations;
1142 inc_nlink(inode);
1143 break;
1144 case S_IFLNK:
1145 inode->i_op = &simple_symlink_inode_operations;
1146 break;
1147 default:
1148 break;
1149 }
1150 return inode;
1151}
1152
1153static int __nfsd_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode, struct nfsdfs_client *ncl)
1154{
1155 struct inode *inode;
1156
1157 inode = nfsd_get_inode(dir->i_sb, mode);
1158 if (!inode)
1159 return -ENOMEM;
1160 if (ncl) {
1161 inode->i_private = ncl;
1162 kref_get(&ncl->cl_ref);
1163 }
1164 d_add(dentry, inode);
1165 inc_nlink(dir);
1166 fsnotify_mkdir(dir, dentry);
1167 return 0;
1168}
1169
1170static struct dentry *nfsd_mkdir(struct dentry *parent, struct nfsdfs_client *ncl, char *name)
1171{
1172 struct inode *dir = parent->d_inode;
1173 struct dentry *dentry;
1174 int ret = -ENOMEM;
1175
1176 inode_lock(dir);
1177 dentry = d_alloc_name(parent, name);
1178 if (!dentry)
1179 goto out_err;
1180 ret = __nfsd_mkdir(d_inode(parent), dentry, S_IFDIR | 0600, ncl);
1181 if (ret)
1182 goto out_err;
1183out:
1184 inode_unlock(dir);
1185 return dentry;
1186out_err:
1187 dput(dentry);
1188 dentry = ERR_PTR(ret);
1189 goto out;
1190}
1191
1192#if IS_ENABLED(CONFIG_SUNRPC_GSS)
1193static int __nfsd_symlink(struct inode *dir, struct dentry *dentry,
1194 umode_t mode, const char *content)
1195{
1196 struct inode *inode;
1197
1198 inode = nfsd_get_inode(dir->i_sb, mode);
1199 if (!inode)
1200 return -ENOMEM;
1201
1202 inode->i_link = (char *)content;
1203 inode->i_size = strlen(content);
1204
1205 d_add(dentry, inode);
1206 inc_nlink(dir);
1207 fsnotify_create(dir, dentry);
1208 return 0;
1209}
1210
1211/*
1212 * @content is assumed to be a NUL-terminated string that lives
1213 * longer than the symlink itself.
1214 */
1215static void _nfsd_symlink(struct dentry *parent, const char *name,
1216 const char *content)
1217{
1218 struct inode *dir = parent->d_inode;
1219 struct dentry *dentry;
1220 int ret;
1221
1222 inode_lock(dir);
1223 dentry = d_alloc_name(parent, name);
1224 if (!dentry)
1225 goto out;
1226 ret = __nfsd_symlink(d_inode(parent), dentry, S_IFLNK | 0777, content);
1227 if (ret)
1228 dput(dentry);
1229out:
1230 inode_unlock(dir);
1231}
1232#else
1233static inline void _nfsd_symlink(struct dentry *parent, const char *name,
1234 const char *content)
1235{
1236}
1237
1238#endif
1239
1240static void clear_ncl(struct dentry *dentry)
1241{
1242 struct inode *inode = d_inode(dentry);
1243 struct nfsdfs_client *ncl = inode->i_private;
1244
1245 spin_lock(&inode->i_lock);
1246 inode->i_private = NULL;
1247 spin_unlock(&inode->i_lock);
1248 kref_put(&ncl->cl_ref, ncl->cl_release);
1249}
1250
1251struct nfsdfs_client *get_nfsdfs_client(struct inode *inode)
1252{
1253 struct nfsdfs_client *nc;
1254
1255 spin_lock(&inode->i_lock);
1256 nc = inode->i_private;
1257 if (nc)
1258 kref_get(&nc->cl_ref);
1259 spin_unlock(&inode->i_lock);
1260 return nc;
1261}
1262
1263/* XXX: cut'n'paste from simple_fill_super; figure out if we could share
1264 * code instead. */
1265static int nfsdfs_create_files(struct dentry *root,
1266 const struct tree_descr *files,
1267 struct nfsdfs_client *ncl,
1268 struct dentry **fdentries)
1269{
1270 struct inode *dir = d_inode(root);
1271 struct inode *inode;
1272 struct dentry *dentry;
1273 int i;
1274
1275 inode_lock(dir);
1276 for (i = 0; files->name && files->name[0]; i++, files++) {
1277 dentry = d_alloc_name(root, files->name);
1278 if (!dentry)
1279 goto out;
1280 inode = nfsd_get_inode(d_inode(root)->i_sb,
1281 S_IFREG | files->mode);
1282 if (!inode) {
1283 dput(dentry);
1284 goto out;
1285 }
1286 kref_get(&ncl->cl_ref);
1287 inode->i_fop = files->ops;
1288 inode->i_private = ncl;
1289 d_add(dentry, inode);
1290 fsnotify_create(dir, dentry);
1291 if (fdentries)
1292 fdentries[i] = dentry;
1293 }
1294 inode_unlock(dir);
1295 return 0;
1296out:
1297 inode_unlock(dir);
1298 return -ENOMEM;
1299}
1300
1301/* on success, returns positive number unique to that client. */
1302struct dentry *nfsd_client_mkdir(struct nfsd_net *nn,
1303 struct nfsdfs_client *ncl, u32 id,
1304 const struct tree_descr *files,
1305 struct dentry **fdentries)
1306{
1307 struct dentry *dentry;
1308 char name[11];
1309 int ret;
1310
1311 sprintf(name, "%u", id);
1312
1313 dentry = nfsd_mkdir(nn->nfsd_client_dir, ncl, name);
1314 if (IS_ERR(dentry)) /* XXX: tossing errors? */
1315 return NULL;
1316 ret = nfsdfs_create_files(dentry, files, ncl, fdentries);
1317 if (ret) {
1318 nfsd_client_rmdir(dentry);
1319 return NULL;
1320 }
1321 return dentry;
1322}
1323
1324/* Taken from __rpc_rmdir: */
1325void nfsd_client_rmdir(struct dentry *dentry)
1326{
1327 simple_recursive_removal(dentry, clear_ncl);
1328}
1329
1330static int nfsd_fill_super(struct super_block *sb, struct fs_context *fc)
1331{
1332 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
1333 nfsd_net_id);
1334 struct dentry *dentry;
1335 int ret;
1336
1337 static const struct tree_descr nfsd_files[] = {
1338 [NFSD_List] = {"exports", &exports_nfsd_operations, S_IRUGO},
1339 /* Per-export io stats use same ops as exports file */
1340 [NFSD_Export_Stats] = {"export_stats", &exports_nfsd_operations, S_IRUGO},
1341 [NFSD_Export_features] = {"export_features",
1342 &export_features_fops, S_IRUGO},
1343 [NFSD_FO_UnlockIP] = {"unlock_ip",
1344 &transaction_ops, S_IWUSR|S_IRUSR},
1345 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1346 &transaction_ops, S_IWUSR|S_IRUSR},
1347 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1348 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1349 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1350 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1351 [NFSD_Reply_Cache_Stats] = {"reply_cache_stats",
1352 &nfsd_reply_cache_stats_fops, S_IRUGO},
1353 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1354 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1355 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1356 [NFSD_MaxConnections] = {"max_connections", &transaction_ops, S_IWUSR|S_IRUGO},
1357 [NFSD_Filecache] = {"filecache", &nfsd_file_cache_stats_fops, S_IRUGO},
1358#ifdef CONFIG_NFSD_V4
1359 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1360 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
1361#ifdef CONFIG_NFSD_LEGACY_CLIENT_TRACKING
1362 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1363#endif
1364 [NFSD_V4EndGrace] = {"v4_end_grace", &transaction_ops, S_IWUSR|S_IRUGO},
1365#endif
1366 /* last one */ {""}
1367 };
1368
1369 ret = simple_fill_super(sb, 0x6e667364, nfsd_files);
1370 if (ret)
1371 return ret;
1372 _nfsd_symlink(sb->s_root, "supported_krb5_enctypes",
1373 "/proc/net/rpc/gss_krb5_enctypes");
1374 dentry = nfsd_mkdir(sb->s_root, NULL, "clients");
1375 if (IS_ERR(dentry))
1376 return PTR_ERR(dentry);
1377 nn->nfsd_client_dir = dentry;
1378 return 0;
1379}
1380
1381static int nfsd_fs_get_tree(struct fs_context *fc)
1382{
1383 return get_tree_keyed(fc, nfsd_fill_super, get_net(fc->net_ns));
1384}
1385
1386static void nfsd_fs_free_fc(struct fs_context *fc)
1387{
1388 if (fc->s_fs_info)
1389 put_net(fc->s_fs_info);
1390}
1391
1392static const struct fs_context_operations nfsd_fs_context_ops = {
1393 .free = nfsd_fs_free_fc,
1394 .get_tree = nfsd_fs_get_tree,
1395};
1396
1397static int nfsd_init_fs_context(struct fs_context *fc)
1398{
1399 put_user_ns(fc->user_ns);
1400 fc->user_ns = get_user_ns(fc->net_ns->user_ns);
1401 fc->ops = &nfsd_fs_context_ops;
1402 return 0;
1403}
1404
1405static void nfsd_umount(struct super_block *sb)
1406{
1407 struct net *net = sb->s_fs_info;
1408
1409 nfsd_shutdown_threads(net);
1410
1411 kill_litter_super(sb);
1412 put_net(net);
1413}
1414
1415static struct file_system_type nfsd_fs_type = {
1416 .owner = THIS_MODULE,
1417 .name = "nfsd",
1418 .init_fs_context = nfsd_init_fs_context,
1419 .kill_sb = nfsd_umount,
1420};
1421MODULE_ALIAS_FS("nfsd");
1422
1423#ifdef CONFIG_PROC_FS
1424
1425static int exports_proc_open(struct inode *inode, struct file *file)
1426{
1427 return exports_net_open(current->nsproxy->net_ns, file);
1428}
1429
1430static const struct proc_ops exports_proc_ops = {
1431 .proc_open = exports_proc_open,
1432 .proc_read = seq_read,
1433 .proc_lseek = seq_lseek,
1434 .proc_release = seq_release,
1435};
1436
1437static int create_proc_exports_entry(void)
1438{
1439 struct proc_dir_entry *entry;
1440
1441 entry = proc_mkdir("fs/nfs", NULL);
1442 if (!entry)
1443 return -ENOMEM;
1444 entry = proc_create("exports", 0, entry, &exports_proc_ops);
1445 if (!entry) {
1446 remove_proc_entry("fs/nfs", NULL);
1447 return -ENOMEM;
1448 }
1449 return 0;
1450}
1451#else /* CONFIG_PROC_FS */
1452static int create_proc_exports_entry(void)
1453{
1454 return 0;
1455}
1456#endif
1457
1458unsigned int nfsd_net_id;
1459
1460/**
1461 * nfsd_nl_rpc_status_get_start - Prepare rpc_status_get dumpit
1462 * @cb: netlink metadata and command arguments
1463 *
1464 * Return values:
1465 * %0: The rpc_status_get command may proceed
1466 * %-ENODEV: There is no NFSD running in this namespace
1467 */
1468int nfsd_nl_rpc_status_get_start(struct netlink_callback *cb)
1469{
1470 struct nfsd_net *nn = net_generic(sock_net(cb->skb->sk), nfsd_net_id);
1471 int ret = -ENODEV;
1472
1473 mutex_lock(&nfsd_mutex);
1474 if (nn->nfsd_serv)
1475 ret = 0;
1476 else
1477 mutex_unlock(&nfsd_mutex);
1478
1479 return ret;
1480}
1481
1482static int nfsd_genl_rpc_status_compose_msg(struct sk_buff *skb,
1483 struct netlink_callback *cb,
1484 struct nfsd_genl_rqstp *rqstp)
1485{
1486 void *hdr;
1487 u32 i;
1488
1489 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
1490 &nfsd_nl_family, 0, NFSD_CMD_RPC_STATUS_GET);
1491 if (!hdr)
1492 return -ENOBUFS;
1493
1494 if (nla_put_be32(skb, NFSD_A_RPC_STATUS_XID, rqstp->rq_xid) ||
1495 nla_put_u32(skb, NFSD_A_RPC_STATUS_FLAGS, rqstp->rq_flags) ||
1496 nla_put_u32(skb, NFSD_A_RPC_STATUS_PROG, rqstp->rq_prog) ||
1497 nla_put_u32(skb, NFSD_A_RPC_STATUS_PROC, rqstp->rq_proc) ||
1498 nla_put_u8(skb, NFSD_A_RPC_STATUS_VERSION, rqstp->rq_vers) ||
1499 nla_put_s64(skb, NFSD_A_RPC_STATUS_SERVICE_TIME,
1500 ktime_to_us(rqstp->rq_stime),
1501 NFSD_A_RPC_STATUS_PAD))
1502 return -ENOBUFS;
1503
1504 switch (rqstp->rq_saddr.sa_family) {
1505 case AF_INET: {
1506 const struct sockaddr_in *s_in, *d_in;
1507
1508 s_in = (const struct sockaddr_in *)&rqstp->rq_saddr;
1509 d_in = (const struct sockaddr_in *)&rqstp->rq_daddr;
1510 if (nla_put_in_addr(skb, NFSD_A_RPC_STATUS_SADDR4,
1511 s_in->sin_addr.s_addr) ||
1512 nla_put_in_addr(skb, NFSD_A_RPC_STATUS_DADDR4,
1513 d_in->sin_addr.s_addr) ||
1514 nla_put_be16(skb, NFSD_A_RPC_STATUS_SPORT,
1515 s_in->sin_port) ||
1516 nla_put_be16(skb, NFSD_A_RPC_STATUS_DPORT,
1517 d_in->sin_port))
1518 return -ENOBUFS;
1519 break;
1520 }
1521 case AF_INET6: {
1522 const struct sockaddr_in6 *s_in, *d_in;
1523
1524 s_in = (const struct sockaddr_in6 *)&rqstp->rq_saddr;
1525 d_in = (const struct sockaddr_in6 *)&rqstp->rq_daddr;
1526 if (nla_put_in6_addr(skb, NFSD_A_RPC_STATUS_SADDR6,
1527 &s_in->sin6_addr) ||
1528 nla_put_in6_addr(skb, NFSD_A_RPC_STATUS_DADDR6,
1529 &d_in->sin6_addr) ||
1530 nla_put_be16(skb, NFSD_A_RPC_STATUS_SPORT,
1531 s_in->sin6_port) ||
1532 nla_put_be16(skb, NFSD_A_RPC_STATUS_DPORT,
1533 d_in->sin6_port))
1534 return -ENOBUFS;
1535 break;
1536 }
1537 }
1538
1539 for (i = 0; i < rqstp->rq_opcnt; i++)
1540 if (nla_put_u32(skb, NFSD_A_RPC_STATUS_COMPOUND_OPS,
1541 rqstp->rq_opnum[i]))
1542 return -ENOBUFS;
1543
1544 genlmsg_end(skb, hdr);
1545 return 0;
1546}
1547
1548/**
1549 * nfsd_nl_rpc_status_get_dumpit - Handle rpc_status_get dumpit
1550 * @skb: reply buffer
1551 * @cb: netlink metadata and command arguments
1552 *
1553 * Returns the size of the reply or a negative errno.
1554 */
1555int nfsd_nl_rpc_status_get_dumpit(struct sk_buff *skb,
1556 struct netlink_callback *cb)
1557{
1558 struct nfsd_net *nn = net_generic(sock_net(skb->sk), nfsd_net_id);
1559 int i, ret, rqstp_index = 0;
1560
1561 rcu_read_lock();
1562
1563 for (i = 0; i < nn->nfsd_serv->sv_nrpools; i++) {
1564 struct svc_rqst *rqstp;
1565
1566 if (i < cb->args[0]) /* already consumed */
1567 continue;
1568
1569 rqstp_index = 0;
1570 list_for_each_entry_rcu(rqstp,
1571 &nn->nfsd_serv->sv_pools[i].sp_all_threads,
1572 rq_all) {
1573 struct nfsd_genl_rqstp genl_rqstp;
1574 unsigned int status_counter;
1575
1576 if (rqstp_index++ < cb->args[1]) /* already consumed */
1577 continue;
1578 /*
1579 * Acquire rq_status_counter before parsing the rqst
1580 * fields. rq_status_counter is set to an odd value in
1581 * order to notify the consumers the rqstp fields are
1582 * meaningful.
1583 */
1584 status_counter =
1585 smp_load_acquire(&rqstp->rq_status_counter);
1586 if (!(status_counter & 1))
1587 continue;
1588
1589 genl_rqstp.rq_xid = rqstp->rq_xid;
1590 genl_rqstp.rq_flags = rqstp->rq_flags;
1591 genl_rqstp.rq_vers = rqstp->rq_vers;
1592 genl_rqstp.rq_prog = rqstp->rq_prog;
1593 genl_rqstp.rq_proc = rqstp->rq_proc;
1594 genl_rqstp.rq_stime = rqstp->rq_stime;
1595 genl_rqstp.rq_opcnt = 0;
1596 memcpy(&genl_rqstp.rq_daddr, svc_daddr(rqstp),
1597 sizeof(struct sockaddr));
1598 memcpy(&genl_rqstp.rq_saddr, svc_addr(rqstp),
1599 sizeof(struct sockaddr));
1600
1601#ifdef CONFIG_NFSD_V4
1602 if (rqstp->rq_vers == NFS4_VERSION &&
1603 rqstp->rq_proc == NFSPROC4_COMPOUND) {
1604 /* NFSv4 compound */
1605 struct nfsd4_compoundargs *args;
1606 int j;
1607
1608 args = rqstp->rq_argp;
1609 genl_rqstp.rq_opcnt = args->opcnt;
1610 for (j = 0; j < genl_rqstp.rq_opcnt; j++)
1611 genl_rqstp.rq_opnum[j] =
1612 args->ops[j].opnum;
1613 }
1614#endif /* CONFIG_NFSD_V4 */
1615
1616 /*
1617 * Acquire rq_status_counter before reporting the rqst
1618 * fields to the user.
1619 */
1620 if (smp_load_acquire(&rqstp->rq_status_counter) !=
1621 status_counter)
1622 continue;
1623
1624 ret = nfsd_genl_rpc_status_compose_msg(skb, cb,
1625 &genl_rqstp);
1626 if (ret)
1627 goto out;
1628 }
1629 }
1630
1631 cb->args[0] = i;
1632 cb->args[1] = rqstp_index;
1633 ret = skb->len;
1634out:
1635 rcu_read_unlock();
1636
1637 return ret;
1638}
1639
1640/**
1641 * nfsd_nl_rpc_status_get_done - rpc_status_get dumpit post-processing
1642 * @cb: netlink metadata and command arguments
1643 *
1644 * Return values:
1645 * %0: Success
1646 */
1647int nfsd_nl_rpc_status_get_done(struct netlink_callback *cb)
1648{
1649 mutex_unlock(&nfsd_mutex);
1650
1651 return 0;
1652}
1653
1654/**
1655 * nfsd_net_init - Prepare the nfsd_net portion of a new net namespace
1656 * @net: a freshly-created network namespace
1657 *
1658 * This information stays around as long as the network namespace is
1659 * alive whether or not there is an NFSD instance running in the
1660 * namespace.
1661 *
1662 * Returns zero on success, or a negative errno otherwise.
1663 */
1664static __net_init int nfsd_net_init(struct net *net)
1665{
1666 int retval;
1667 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1668
1669 retval = nfsd_export_init(net);
1670 if (retval)
1671 goto out_export_error;
1672 retval = nfsd_idmap_init(net);
1673 if (retval)
1674 goto out_idmap_error;
1675 retval = nfsd_stat_counters_init(nn);
1676 if (retval)
1677 goto out_repcache_error;
1678 memset(&nn->nfsd_svcstats, 0, sizeof(nn->nfsd_svcstats));
1679 nn->nfsd_svcstats.program = &nfsd_program;
1680 nn->nfsd_versions = NULL;
1681 nn->nfsd4_minorversions = NULL;
1682 nfsd4_init_leases_net(nn);
1683 get_random_bytes(&nn->siphash_key, sizeof(nn->siphash_key));
1684 seqlock_init(&nn->writeverf_lock);
1685 nfsd_proc_stat_init(net);
1686
1687 return 0;
1688
1689out_repcache_error:
1690 nfsd_idmap_shutdown(net);
1691out_idmap_error:
1692 nfsd_export_shutdown(net);
1693out_export_error:
1694 return retval;
1695}
1696
1697/**
1698 * nfsd_net_exit - Release the nfsd_net portion of a net namespace
1699 * @net: a network namespace that is about to be destroyed
1700 *
1701 */
1702static __net_exit void nfsd_net_exit(struct net *net)
1703{
1704 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1705
1706 nfsd_proc_stat_shutdown(net);
1707 nfsd_stat_counters_destroy(nn);
1708 nfsd_idmap_shutdown(net);
1709 nfsd_export_shutdown(net);
1710 nfsd_netns_free_versions(nn);
1711}
1712
1713static struct pernet_operations nfsd_net_ops = {
1714 .init = nfsd_net_init,
1715 .exit = nfsd_net_exit,
1716 .id = &nfsd_net_id,
1717 .size = sizeof(struct nfsd_net),
1718};
1719
1720static int __init init_nfsd(void)
1721{
1722 int retval;
1723
1724 retval = nfsd4_init_slabs();
1725 if (retval)
1726 return retval;
1727 retval = nfsd4_init_pnfs();
1728 if (retval)
1729 goto out_free_slabs;
1730 retval = nfsd_drc_slab_create();
1731 if (retval)
1732 goto out_free_pnfs;
1733 nfsd_lockd_init(); /* lockd->nfsd callbacks */
1734 retval = create_proc_exports_entry();
1735 if (retval)
1736 goto out_free_lockd;
1737 retval = register_pernet_subsys(&nfsd_net_ops);
1738 if (retval < 0)
1739 goto out_free_exports;
1740 retval = register_cld_notifier();
1741 if (retval)
1742 goto out_free_subsys;
1743 retval = nfsd4_create_laundry_wq();
1744 if (retval)
1745 goto out_free_cld;
1746 retval = register_filesystem(&nfsd_fs_type);
1747 if (retval)
1748 goto out_free_all;
1749 retval = genl_register_family(&nfsd_nl_family);
1750 if (retval)
1751 goto out_free_all;
1752
1753 return 0;
1754out_free_all:
1755 nfsd4_destroy_laundry_wq();
1756out_free_cld:
1757 unregister_cld_notifier();
1758out_free_subsys:
1759 unregister_pernet_subsys(&nfsd_net_ops);
1760out_free_exports:
1761 remove_proc_entry("fs/nfs/exports", NULL);
1762 remove_proc_entry("fs/nfs", NULL);
1763out_free_lockd:
1764 nfsd_lockd_shutdown();
1765 nfsd_drc_slab_free();
1766out_free_pnfs:
1767 nfsd4_exit_pnfs();
1768out_free_slabs:
1769 nfsd4_free_slabs();
1770 return retval;
1771}
1772
1773static void __exit exit_nfsd(void)
1774{
1775 genl_unregister_family(&nfsd_nl_family);
1776 unregister_filesystem(&nfsd_fs_type);
1777 nfsd4_destroy_laundry_wq();
1778 unregister_cld_notifier();
1779 unregister_pernet_subsys(&nfsd_net_ops);
1780 nfsd_drc_slab_free();
1781 remove_proc_entry("fs/nfs/exports", NULL);
1782 remove_proc_entry("fs/nfs", NULL);
1783 nfsd_lockd_shutdown();
1784 nfsd4_free_slabs();
1785 nfsd4_exit_pnfs();
1786}
1787
1788MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1789MODULE_DESCRIPTION("In-kernel NFS server");
1790MODULE_LICENSE("GPL");
1791module_init(init_nfsd)
1792module_exit(exit_nfsd)