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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#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 .owner = THIS_MODULE,
162};
163
164static int exports_nfsd_open(struct inode *inode, struct file *file)
165{
166 return exports_net_open(inode->i_sb->s_fs_info, file);
167}
168
169static const struct file_operations exports_nfsd_operations = {
170 .open = exports_nfsd_open,
171 .read = seq_read,
172 .llseek = seq_lseek,
173 .release = seq_release,
174 .owner = THIS_MODULE,
175};
176
177static int export_features_show(struct seq_file *m, void *v)
178{
179 seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS);
180 return 0;
181}
182
183static int export_features_open(struct inode *inode, struct file *file)
184{
185 return single_open(file, export_features_show, NULL);
186}
187
188static const struct file_operations export_features_operations = {
189 .open = export_features_open,
190 .read = seq_read,
191 .llseek = seq_lseek,
192 .release = single_release,
193};
194
195#if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
196static int supported_enctypes_show(struct seq_file *m, void *v)
197{
198 seq_printf(m, KRB5_SUPPORTED_ENCTYPES);
199 return 0;
200}
201
202static int supported_enctypes_open(struct inode *inode, struct file *file)
203{
204 return single_open(file, supported_enctypes_show, NULL);
205}
206
207static const struct file_operations supported_enctypes_ops = {
208 .open = supported_enctypes_open,
209 .read = seq_read,
210 .llseek = seq_lseek,
211 .release = single_release,
212};
213#endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
214
215static const struct file_operations pool_stats_operations = {
216 .open = nfsd_pool_stats_open,
217 .read = seq_read,
218 .llseek = seq_lseek,
219 .release = nfsd_pool_stats_release,
220 .owner = THIS_MODULE,
221};
222
223static struct file_operations reply_cache_stats_operations = {
224 .open = nfsd_reply_cache_stats_open,
225 .read = seq_read,
226 .llseek = seq_lseek,
227 .release = single_release,
228};
229
230/*----------------------------------------------------------------------------*/
231/*
232 * payload - write methods
233 */
234
235static inline struct net *netns(struct file *file)
236{
237 return file_inode(file)->i_sb->s_fs_info;
238}
239
240/**
241 * write_unlock_ip - Release all locks used by a client
242 *
243 * Experimental.
244 *
245 * Input:
246 * buf: '\n'-terminated C string containing a
247 * presentation format IP address
248 * size: length of C string in @buf
249 * Output:
250 * On success: returns zero if all specified locks were released;
251 * returns one if one or more locks were not released
252 * On error: return code is negative errno value
253 */
254static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
255{
256 struct sockaddr_storage address;
257 struct sockaddr *sap = (struct sockaddr *)&address;
258 size_t salen = sizeof(address);
259 char *fo_path;
260 struct net *net = netns(file);
261
262 /* sanity check */
263 if (size == 0)
264 return -EINVAL;
265
266 if (buf[size-1] != '\n')
267 return -EINVAL;
268
269 fo_path = buf;
270 if (qword_get(&buf, fo_path, size) < 0)
271 return -EINVAL;
272
273 if (rpc_pton(net, fo_path, size, sap, salen) == 0)
274 return -EINVAL;
275
276 return nlmsvc_unlock_all_by_ip(sap);
277}
278
279/**
280 * write_unlock_fs - Release all locks on a local file system
281 *
282 * Experimental.
283 *
284 * Input:
285 * buf: '\n'-terminated C string containing the
286 * absolute pathname of a local file system
287 * size: length of C string in @buf
288 * Output:
289 * On success: returns zero if all specified locks were released;
290 * returns one if one or more locks were not released
291 * On error: return code is negative errno value
292 */
293static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
294{
295 struct path path;
296 char *fo_path;
297 int error;
298
299 /* sanity check */
300 if (size == 0)
301 return -EINVAL;
302
303 if (buf[size-1] != '\n')
304 return -EINVAL;
305
306 fo_path = buf;
307 if (qword_get(&buf, fo_path, size) < 0)
308 return -EINVAL;
309
310 error = kern_path(fo_path, 0, &path);
311 if (error)
312 return error;
313
314 /*
315 * XXX: Needs better sanity checking. Otherwise we could end up
316 * releasing locks on the wrong file system.
317 *
318 * For example:
319 * 1. Does the path refer to a directory?
320 * 2. Is that directory a mount point, or
321 * 3. Is that directory the root of an exported file system?
322 */
323 error = nlmsvc_unlock_all_by_sb(path.dentry->d_sb);
324
325 path_put(&path);
326 return error;
327}
328
329/**
330 * write_filehandle - Get a variable-length NFS file handle by path
331 *
332 * On input, the buffer contains a '\n'-terminated C string comprised of
333 * three alphanumeric words separated by whitespace. The string may
334 * contain escape sequences.
335 *
336 * Input:
337 * buf:
338 * domain: client domain name
339 * path: export pathname
340 * maxsize: numeric maximum size of
341 * @buf
342 * size: length of C string in @buf
343 * Output:
344 * On success: passed-in buffer filled with '\n'-terminated C
345 * string containing a ASCII hex text version
346 * of the NFS file handle;
347 * return code is the size in bytes of the string
348 * On error: return code is negative errno value
349 */
350static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
351{
352 char *dname, *path;
353 int uninitialized_var(maxsize);
354 char *mesg = buf;
355 int len;
356 struct auth_domain *dom;
357 struct knfsd_fh fh;
358
359 if (size == 0)
360 return -EINVAL;
361
362 if (buf[size-1] != '\n')
363 return -EINVAL;
364 buf[size-1] = 0;
365
366 dname = mesg;
367 len = qword_get(&mesg, dname, size);
368 if (len <= 0)
369 return -EINVAL;
370
371 path = dname+len+1;
372 len = qword_get(&mesg, path, size);
373 if (len <= 0)
374 return -EINVAL;
375
376 len = get_int(&mesg, &maxsize);
377 if (len)
378 return len;
379
380 if (maxsize < NFS_FHSIZE)
381 return -EINVAL;
382 maxsize = min(maxsize, NFS3_FHSIZE);
383
384 if (qword_get(&mesg, mesg, size)>0)
385 return -EINVAL;
386
387 /* we have all the words, they are in buf.. */
388 dom = unix_domain_find(dname);
389 if (!dom)
390 return -ENOMEM;
391
392 len = exp_rootfh(netns(file), dom, path, &fh, maxsize);
393 auth_domain_put(dom);
394 if (len)
395 return len;
396
397 mesg = buf;
398 len = SIMPLE_TRANSACTION_LIMIT;
399 qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
400 mesg[-1] = '\n';
401 return mesg - buf;
402}
403
404/**
405 * write_threads - Start NFSD, or report the current number of running threads
406 *
407 * Input:
408 * buf: ignored
409 * size: zero
410 * Output:
411 * On success: passed-in buffer filled with '\n'-terminated C
412 * string numeric value representing the number of
413 * running NFSD threads;
414 * return code is the size in bytes of the string
415 * On error: return code is zero
416 *
417 * OR
418 *
419 * Input:
420 * buf: C string containing an unsigned
421 * integer value representing the
422 * number of NFSD threads to start
423 * size: non-zero length of C string in @buf
424 * Output:
425 * On success: NFS service is started;
426 * passed-in buffer filled with '\n'-terminated C
427 * string numeric value representing the number of
428 * running NFSD threads;
429 * return code is the size in bytes of the string
430 * On error: return code is zero or a negative errno value
431 */
432static ssize_t write_threads(struct file *file, char *buf, size_t size)
433{
434 char *mesg = buf;
435 int rv;
436 struct net *net = netns(file);
437
438 if (size > 0) {
439 int newthreads;
440 rv = get_int(&mesg, &newthreads);
441 if (rv)
442 return rv;
443 if (newthreads < 0)
444 return -EINVAL;
445 rv = nfsd_svc(newthreads, net);
446 if (rv < 0)
447 return rv;
448 } else
449 rv = nfsd_nrthreads(net);
450
451 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
452}
453
454/**
455 * write_pool_threads - Set or report the current number of threads per pool
456 *
457 * Input:
458 * buf: ignored
459 * size: zero
460 *
461 * OR
462 *
463 * Input:
464 * buf: C string containing whitespace-
465 * separated unsigned integer values
466 * representing the number of NFSD
467 * threads to start in each pool
468 * size: non-zero length of C string in @buf
469 * Output:
470 * On success: passed-in buffer filled with '\n'-terminated C
471 * string containing integer values representing the
472 * number of NFSD threads in each pool;
473 * return code is the size in bytes of the string
474 * On error: return code is zero or a negative errno value
475 */
476static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
477{
478 /* if size > 0, look for an array of number of threads per node
479 * and apply them then write out number of threads per node as reply
480 */
481 char *mesg = buf;
482 int i;
483 int rv;
484 int len;
485 int npools;
486 int *nthreads;
487 struct net *net = netns(file);
488
489 mutex_lock(&nfsd_mutex);
490 npools = nfsd_nrpools(net);
491 if (npools == 0) {
492 /*
493 * NFS is shut down. The admin can start it by
494 * writing to the threads file but NOT the pool_threads
495 * file, sorry. Report zero threads.
496 */
497 mutex_unlock(&nfsd_mutex);
498 strcpy(buf, "0\n");
499 return strlen(buf);
500 }
501
502 nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
503 rv = -ENOMEM;
504 if (nthreads == NULL)
505 goto out_free;
506
507 if (size > 0) {
508 for (i = 0; i < npools; i++) {
509 rv = get_int(&mesg, &nthreads[i]);
510 if (rv == -ENOENT)
511 break; /* fewer numbers than pools */
512 if (rv)
513 goto out_free; /* syntax error */
514 rv = -EINVAL;
515 if (nthreads[i] < 0)
516 goto out_free;
517 }
518 rv = nfsd_set_nrthreads(i, nthreads, net);
519 if (rv)
520 goto out_free;
521 }
522
523 rv = nfsd_get_nrthreads(npools, nthreads, net);
524 if (rv)
525 goto out_free;
526
527 mesg = buf;
528 size = SIMPLE_TRANSACTION_LIMIT;
529 for (i = 0; i < npools && size > 0; i++) {
530 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
531 len = strlen(mesg);
532 size -= len;
533 mesg += len;
534 }
535 rv = mesg - buf;
536out_free:
537 kfree(nthreads);
538 mutex_unlock(&nfsd_mutex);
539 return rv;
540}
541
542static ssize_t __write_versions(struct file *file, char *buf, size_t size)
543{
544 char *mesg = buf;
545 char *vers, *minorp, sign;
546 int len, num, remaining;
547 unsigned minor;
548 ssize_t tlen = 0;
549 char *sep;
550 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
551
552 if (size>0) {
553 if (nn->nfsd_serv)
554 /* Cannot change versions without updating
555 * nn->nfsd_serv->sv_xdrsize, and reallocing
556 * rq_argp and rq_resp
557 */
558 return -EBUSY;
559 if (buf[size-1] != '\n')
560 return -EINVAL;
561 buf[size-1] = 0;
562
563 vers = mesg;
564 len = qword_get(&mesg, vers, size);
565 if (len <= 0) return -EINVAL;
566 do {
567 sign = *vers;
568 if (sign == '+' || sign == '-')
569 num = simple_strtol((vers+1), &minorp, 0);
570 else
571 num = simple_strtol(vers, &minorp, 0);
572 if (*minorp == '.') {
573 if (num != 4)
574 return -EINVAL;
575 minor = simple_strtoul(minorp+1, NULL, 0);
576 if (minor == 0)
577 return -EINVAL;
578 if (nfsd_minorversion(minor, sign == '-' ?
579 NFSD_CLEAR : NFSD_SET) < 0)
580 return -EINVAL;
581 goto next;
582 }
583 switch(num) {
584 case 2:
585 case 3:
586 case 4:
587 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
588 break;
589 default:
590 return -EINVAL;
591 }
592 next:
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();
599 }
600
601 /* Now write current state into reply buffer */
602 len = 0;
603 sep = "";
604 remaining = SIMPLE_TRANSACTION_LIMIT;
605 for (num=2 ; num <= 4 ; num++)
606 if (nfsd_vers(num, NFSD_AVAIL)) {
607 len = snprintf(buf, remaining, "%s%c%d", sep,
608 nfsd_vers(num, NFSD_TEST)?'+':'-',
609 num);
610 sep = " ";
611
612 if (len >= remaining)
613 break;
614 remaining -= len;
615 buf += len;
616 tlen += len;
617 }
618 if (nfsd_vers(4, NFSD_AVAIL))
619 for (minor = 1; minor <= NFSD_SUPPORTED_MINOR_VERSION;
620 minor++) {
621 len = snprintf(buf, remaining, " %c4.%u",
622 (nfsd_vers(4, NFSD_TEST) &&
623 nfsd_minorversion(minor, NFSD_TEST)) ?
624 '+' : '-',
625 minor);
626
627 if (len >= remaining)
628 break;
629 remaining -= len;
630 buf += len;
631 tlen += len;
632 }
633
634 len = snprintf(buf, remaining, "\n");
635 if (len >= remaining)
636 return -EINVAL;
637 return tlen + len;
638}
639
640/**
641 * write_versions - Set or report the available NFS protocol versions
642 *
643 * Input:
644 * buf: ignored
645 * size: zero
646 * Output:
647 * On success: passed-in buffer filled with '\n'-terminated C
648 * string containing positive or negative integer
649 * values representing the current status of each
650 * protocol version;
651 * return code is the size in bytes of the string
652 * On error: return code is zero or a negative errno value
653 *
654 * OR
655 *
656 * Input:
657 * buf: C string containing whitespace-
658 * separated positive or negative
659 * integer values representing NFS
660 * protocol versions to enable ("+n")
661 * or disable ("-n")
662 * size: non-zero length of C string in @buf
663 * Output:
664 * On success: status of zero or more protocol versions has
665 * been updated; passed-in buffer filled with
666 * '\n'-terminated C string containing positive
667 * or negative integer values representing the
668 * current status of each protocol version;
669 * return code is the size in bytes of the string
670 * On error: return code is zero or a negative errno value
671 */
672static ssize_t write_versions(struct file *file, char *buf, size_t size)
673{
674 ssize_t rv;
675
676 mutex_lock(&nfsd_mutex);
677 rv = __write_versions(file, buf, size);
678 mutex_unlock(&nfsd_mutex);
679 return rv;
680}
681
682/*
683 * Zero-length write. Return a list of NFSD's current listener
684 * transports.
685 */
686static ssize_t __write_ports_names(char *buf, struct net *net)
687{
688 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
689
690 if (nn->nfsd_serv == NULL)
691 return 0;
692 return svc_xprt_names(nn->nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
693}
694
695/*
696 * A single 'fd' number was written, in which case it must be for
697 * a socket of a supported family/protocol, and we use it as an
698 * nfsd listener.
699 */
700static ssize_t __write_ports_addfd(char *buf, struct net *net)
701{
702 char *mesg = buf;
703 int fd, err;
704 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
705
706 err = get_int(&mesg, &fd);
707 if (err != 0 || fd < 0)
708 return -EINVAL;
709
710 if (svc_alien_sock(net, fd)) {
711 printk(KERN_ERR "%s: socket net is different to NFSd's one\n", __func__);
712 return -EINVAL;
713 }
714
715 err = nfsd_create_serv(net);
716 if (err != 0)
717 return err;
718
719 err = svc_addsock(nn->nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT);
720 if (err < 0) {
721 nfsd_destroy(net);
722 return err;
723 }
724
725 /* Decrease the count, but don't shut down the service */
726 nn->nfsd_serv->sv_nrthreads--;
727 return err;
728}
729
730/*
731 * A transport listener is added by writing it's transport name and
732 * a port number.
733 */
734static ssize_t __write_ports_addxprt(char *buf, struct net *net)
735{
736 char transport[16];
737 struct svc_xprt *xprt;
738 int port, err;
739 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
740
741 if (sscanf(buf, "%15s %5u", transport, &port) != 2)
742 return -EINVAL;
743
744 if (port < 1 || port > USHRT_MAX)
745 return -EINVAL;
746
747 err = nfsd_create_serv(net);
748 if (err != 0)
749 return err;
750
751 err = svc_create_xprt(nn->nfsd_serv, transport, net,
752 PF_INET, port, SVC_SOCK_ANONYMOUS);
753 if (err < 0)
754 goto out_err;
755
756 err = svc_create_xprt(nn->nfsd_serv, transport, net,
757 PF_INET6, port, SVC_SOCK_ANONYMOUS);
758 if (err < 0 && err != -EAFNOSUPPORT)
759 goto out_close;
760
761 /* Decrease the count, but don't shut down the service */
762 nn->nfsd_serv->sv_nrthreads--;
763 return 0;
764out_close:
765 xprt = svc_find_xprt(nn->nfsd_serv, transport, net, PF_INET, port);
766 if (xprt != NULL) {
767 svc_close_xprt(xprt);
768 svc_xprt_put(xprt);
769 }
770out_err:
771 nfsd_destroy(net);
772 return err;
773}
774
775static ssize_t __write_ports(struct file *file, char *buf, size_t size,
776 struct net *net)
777{
778 if (size == 0)
779 return __write_ports_names(buf, net);
780
781 if (isdigit(buf[0]))
782 return __write_ports_addfd(buf, net);
783
784 if (isalpha(buf[0]))
785 return __write_ports_addxprt(buf, net);
786
787 return -EINVAL;
788}
789
790/**
791 * write_ports - Pass a socket file descriptor or transport name to listen on
792 *
793 * Input:
794 * buf: ignored
795 * size: zero
796 * Output:
797 * On success: passed-in buffer filled with a '\n'-terminated C
798 * string containing a whitespace-separated list of
799 * named NFSD listeners;
800 * return code is the size in bytes of the string
801 * On error: return code is zero or a negative errno value
802 *
803 * OR
804 *
805 * Input:
806 * buf: C string containing an unsigned
807 * integer value representing a bound
808 * but unconnected socket that is to be
809 * used as an NFSD listener; listen(3)
810 * must be called for a SOCK_STREAM
811 * socket, otherwise it is ignored
812 * size: non-zero length of C string in @buf
813 * Output:
814 * On success: NFS service is started;
815 * passed-in buffer filled with a '\n'-terminated C
816 * string containing a unique alphanumeric name of
817 * the listener;
818 * return code is the size in bytes of the string
819 * On error: return code is a negative errno value
820 *
821 * OR
822 *
823 * Input:
824 * buf: C string containing a transport
825 * name and an unsigned integer value
826 * representing the port to listen on,
827 * separated by whitespace
828 * size: non-zero length of C string in @buf
829 * Output:
830 * On success: returns zero; NFS service is started
831 * On error: return code is a negative errno value
832 */
833static ssize_t write_ports(struct file *file, char *buf, size_t size)
834{
835 ssize_t rv;
836
837 mutex_lock(&nfsd_mutex);
838 rv = __write_ports(file, buf, size, netns(file));
839 mutex_unlock(&nfsd_mutex);
840 return rv;
841}
842
843
844int nfsd_max_blksize;
845
846/**
847 * write_maxblksize - Set or report the current NFS blksize
848 *
849 * Input:
850 * buf: ignored
851 * size: zero
852 *
853 * OR
854 *
855 * Input:
856 * buf: C string containing an unsigned
857 * integer value representing the new
858 * NFS blksize
859 * size: non-zero length of C string in @buf
860 * Output:
861 * On success: passed-in buffer filled with '\n'-terminated C string
862 * containing numeric value of the current NFS blksize
863 * setting;
864 * return code is the size in bytes of the string
865 * On error: return code is zero or a negative errno value
866 */
867static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
868{
869 char *mesg = buf;
870 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
871
872 if (size > 0) {
873 int bsize;
874 int rv = get_int(&mesg, &bsize);
875 if (rv)
876 return rv;
877 /* force bsize into allowed range and
878 * required alignment.
879 */
880 bsize = max_t(int, bsize, 1024);
881 bsize = min_t(int, bsize, NFSSVC_MAXBLKSIZE);
882 bsize &= ~(1024-1);
883 mutex_lock(&nfsd_mutex);
884 if (nn->nfsd_serv) {
885 mutex_unlock(&nfsd_mutex);
886 return -EBUSY;
887 }
888 nfsd_max_blksize = bsize;
889 mutex_unlock(&nfsd_mutex);
890 }
891
892 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
893 nfsd_max_blksize);
894}
895
896/**
897 * write_maxconn - Set or report the current max number of connections
898 *
899 * Input:
900 * buf: ignored
901 * size: zero
902 * OR
903 *
904 * Input:
905 * buf: C string containing an unsigned
906 * integer value representing the new
907 * number of max connections
908 * size: non-zero length of C string in @buf
909 * Output:
910 * On success: passed-in buffer filled with '\n'-terminated C string
911 * containing numeric value of max_connections setting
912 * for this net namespace;
913 * return code is the size in bytes of the string
914 * On error: return code is zero or a negative errno value
915 */
916static ssize_t write_maxconn(struct file *file, char *buf, size_t size)
917{
918 char *mesg = buf;
919 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
920 unsigned int maxconn = nn->max_connections;
921
922 if (size > 0) {
923 int rv = get_uint(&mesg, &maxconn);
924
925 if (rv)
926 return rv;
927 nn->max_connections = maxconn;
928 }
929
930 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%u\n", maxconn);
931}
932
933#ifdef CONFIG_NFSD_V4
934static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size,
935 time_t *time, struct nfsd_net *nn)
936{
937 char *mesg = buf;
938 int rv, i;
939
940 if (size > 0) {
941 if (nn->nfsd_serv)
942 return -EBUSY;
943 rv = get_int(&mesg, &i);
944 if (rv)
945 return rv;
946 /*
947 * Some sanity checking. We don't have a reason for
948 * these particular numbers, but problems with the
949 * extremes are:
950 * - Too short: the briefest network outage may
951 * cause clients to lose all their locks. Also,
952 * the frequent polling may be wasteful.
953 * - Too long: do you really want reboot recovery
954 * to take more than an hour? Or to make other
955 * clients wait an hour before being able to
956 * revoke a dead client's locks?
957 */
958 if (i < 10 || i > 3600)
959 return -EINVAL;
960 *time = i;
961 }
962
963 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%ld\n", *time);
964}
965
966static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size,
967 time_t *time, struct nfsd_net *nn)
968{
969 ssize_t rv;
970
971 mutex_lock(&nfsd_mutex);
972 rv = __nfsd4_write_time(file, buf, size, time, nn);
973 mutex_unlock(&nfsd_mutex);
974 return rv;
975}
976
977/**
978 * write_leasetime - Set or report the current NFSv4 lease time
979 *
980 * Input:
981 * buf: ignored
982 * size: zero
983 *
984 * OR
985 *
986 * Input:
987 * buf: C string containing an unsigned
988 * integer value representing the new
989 * NFSv4 lease expiry time
990 * size: non-zero length of C string in @buf
991 * Output:
992 * On success: passed-in buffer filled with '\n'-terminated C
993 * string containing unsigned integer value of the
994 * current lease expiry time;
995 * return code is the size in bytes of the string
996 * On error: return code is zero or a negative errno value
997 */
998static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
999{
1000 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1001 return nfsd4_write_time(file, buf, size, &nn->nfsd4_lease, nn);
1002}
1003
1004/**
1005 * write_gracetime - Set or report current NFSv4 grace period time
1006 *
1007 * As above, but sets the time of the NFSv4 grace period.
1008 *
1009 * Note this should never be set to less than the *previous*
1010 * lease-period time, but we don't try to enforce this. (In the common
1011 * case (a new boot), we don't know what the previous lease time was
1012 * anyway.)
1013 */
1014static ssize_t write_gracetime(struct file *file, char *buf, size_t size)
1015{
1016 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1017 return nfsd4_write_time(file, buf, size, &nn->nfsd4_grace, nn);
1018}
1019
1020static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size,
1021 struct nfsd_net *nn)
1022{
1023 char *mesg = buf;
1024 char *recdir;
1025 int len, status;
1026
1027 if (size > 0) {
1028 if (nn->nfsd_serv)
1029 return -EBUSY;
1030 if (size > PATH_MAX || buf[size-1] != '\n')
1031 return -EINVAL;
1032 buf[size-1] = 0;
1033
1034 recdir = mesg;
1035 len = qword_get(&mesg, recdir, size);
1036 if (len <= 0)
1037 return -EINVAL;
1038
1039 status = nfs4_reset_recoverydir(recdir);
1040 if (status)
1041 return status;
1042 }
1043
1044 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
1045 nfs4_recoverydir());
1046}
1047
1048/**
1049 * write_recoverydir - Set or report the pathname of the recovery directory
1050 *
1051 * Input:
1052 * buf: ignored
1053 * size: zero
1054 *
1055 * OR
1056 *
1057 * Input:
1058 * buf: C string containing the pathname
1059 * of the directory on a local file
1060 * system containing permanent NFSv4
1061 * recovery data
1062 * size: non-zero length of C string in @buf
1063 * Output:
1064 * On success: passed-in buffer filled with '\n'-terminated C string
1065 * containing the current recovery pathname setting;
1066 * return code is the size in bytes of the string
1067 * On error: return code is zero or a negative errno value
1068 */
1069static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
1070{
1071 ssize_t rv;
1072 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1073
1074 mutex_lock(&nfsd_mutex);
1075 rv = __write_recoverydir(file, buf, size, nn);
1076 mutex_unlock(&nfsd_mutex);
1077 return rv;
1078}
1079
1080/**
1081 * write_v4_end_grace - release grace period for nfsd's v4.x lock manager
1082 *
1083 * Input:
1084 * buf: ignored
1085 * size: zero
1086 * OR
1087 *
1088 * Input:
1089 * buf: any value
1090 * size: non-zero length of C string in @buf
1091 * Output:
1092 * passed-in buffer filled with "Y" or "N" with a newline
1093 * and NULL-terminated C string. This indicates whether
1094 * the grace period has ended in the current net
1095 * namespace. Return code is the size in bytes of the
1096 * string. Writing a string that starts with 'Y', 'y', or
1097 * '1' to the file will end the grace period for nfsd's v4
1098 * lock manager.
1099 */
1100static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size)
1101{
1102 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1103
1104 if (size > 0) {
1105 switch(buf[0]) {
1106 case 'Y':
1107 case 'y':
1108 case '1':
1109 nfsd4_end_grace(nn);
1110 break;
1111 default:
1112 return -EINVAL;
1113 }
1114 }
1115
1116 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%c\n",
1117 nn->grace_ended ? 'Y' : 'N');
1118}
1119
1120#endif
1121
1122/*----------------------------------------------------------------------------*/
1123/*
1124 * populating the filesystem.
1125 */
1126
1127static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
1128{
1129 static struct tree_descr nfsd_files[] = {
1130 [NFSD_List] = {"exports", &exports_nfsd_operations, S_IRUGO},
1131 [NFSD_Export_features] = {"export_features",
1132 &export_features_operations, S_IRUGO},
1133 [NFSD_FO_UnlockIP] = {"unlock_ip",
1134 &transaction_ops, S_IWUSR|S_IRUSR},
1135 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1136 &transaction_ops, S_IWUSR|S_IRUSR},
1137 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1138 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1139 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1140 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1141 [NFSD_Reply_Cache_Stats] = {"reply_cache_stats", &reply_cache_stats_operations, S_IRUGO},
1142 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1143 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1144 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1145 [NFSD_MaxConnections] = {"max_connections", &transaction_ops, S_IWUSR|S_IRUGO},
1146#if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
1147 [NFSD_SupportedEnctypes] = {"supported_krb5_enctypes", &supported_enctypes_ops, S_IRUGO},
1148#endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
1149#ifdef CONFIG_NFSD_V4
1150 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1151 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
1152 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1153 [NFSD_V4EndGrace] = {"v4_end_grace", &transaction_ops, S_IWUSR|S_IRUGO},
1154#endif
1155 /* last one */ {""}
1156 };
1157 struct net *net = data;
1158 int ret;
1159
1160 ret = simple_fill_super(sb, 0x6e667364, nfsd_files);
1161 if (ret)
1162 return ret;
1163 sb->s_fs_info = get_net(net);
1164 return 0;
1165}
1166
1167static struct dentry *nfsd_mount(struct file_system_type *fs_type,
1168 int flags, const char *dev_name, void *data)
1169{
1170 return mount_ns(fs_type, flags, current->nsproxy->net_ns, nfsd_fill_super);
1171}
1172
1173static void nfsd_umount(struct super_block *sb)
1174{
1175 struct net *net = sb->s_fs_info;
1176
1177 kill_litter_super(sb);
1178 put_net(net);
1179}
1180
1181static struct file_system_type nfsd_fs_type = {
1182 .owner = THIS_MODULE,
1183 .name = "nfsd",
1184 .mount = nfsd_mount,
1185 .kill_sb = nfsd_umount,
1186};
1187MODULE_ALIAS_FS("nfsd");
1188
1189#ifdef CONFIG_PROC_FS
1190static int create_proc_exports_entry(void)
1191{
1192 struct proc_dir_entry *entry;
1193
1194 entry = proc_mkdir("fs/nfs", NULL);
1195 if (!entry)
1196 return -ENOMEM;
1197 entry = proc_create("exports", 0, entry,
1198 &exports_proc_operations);
1199 if (!entry) {
1200 remove_proc_entry("fs/nfs", NULL);
1201 return -ENOMEM;
1202 }
1203 return 0;
1204}
1205#else /* CONFIG_PROC_FS */
1206static int create_proc_exports_entry(void)
1207{
1208 return 0;
1209}
1210#endif
1211
1212int nfsd_net_id;
1213
1214static __net_init int nfsd_init_net(struct net *net)
1215{
1216 int retval;
1217 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1218
1219 retval = nfsd_export_init(net);
1220 if (retval)
1221 goto out_export_error;
1222 retval = nfsd_idmap_init(net);
1223 if (retval)
1224 goto out_idmap_error;
1225 nn->nfsd4_lease = 90; /* default lease time */
1226 nn->nfsd4_grace = 90;
1227 return 0;
1228
1229out_idmap_error:
1230 nfsd_export_shutdown(net);
1231out_export_error:
1232 return retval;
1233}
1234
1235static __net_exit void nfsd_exit_net(struct net *net)
1236{
1237 nfsd_idmap_shutdown(net);
1238 nfsd_export_shutdown(net);
1239}
1240
1241static struct pernet_operations nfsd_net_ops = {
1242 .init = nfsd_init_net,
1243 .exit = nfsd_exit_net,
1244 .id = &nfsd_net_id,
1245 .size = sizeof(struct nfsd_net),
1246};
1247
1248static int __init init_nfsd(void)
1249{
1250 int retval;
1251 printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
1252
1253 retval = register_pernet_subsys(&nfsd_net_ops);
1254 if (retval < 0)
1255 return retval;
1256 retval = register_cld_notifier();
1257 if (retval)
1258 goto out_unregister_pernet;
1259 retval = nfsd4_init_slabs();
1260 if (retval)
1261 goto out_unregister_notifier;
1262 retval = nfsd4_init_pnfs();
1263 if (retval)
1264 goto out_free_slabs;
1265 retval = nfsd_fault_inject_init(); /* nfsd fault injection controls */
1266 if (retval)
1267 goto out_exit_pnfs;
1268 nfsd_stat_init(); /* Statistics */
1269 retval = nfsd_reply_cache_init();
1270 if (retval)
1271 goto out_free_stat;
1272 nfsd_lockd_init(); /* lockd->nfsd callbacks */
1273 retval = create_proc_exports_entry();
1274 if (retval)
1275 goto out_free_lockd;
1276 retval = register_filesystem(&nfsd_fs_type);
1277 if (retval)
1278 goto out_free_all;
1279 return 0;
1280out_free_all:
1281 remove_proc_entry("fs/nfs/exports", NULL);
1282 remove_proc_entry("fs/nfs", NULL);
1283out_free_lockd:
1284 nfsd_lockd_shutdown();
1285 nfsd_reply_cache_shutdown();
1286out_free_stat:
1287 nfsd_stat_shutdown();
1288 nfsd_fault_inject_cleanup();
1289out_exit_pnfs:
1290 nfsd4_exit_pnfs();
1291out_free_slabs:
1292 nfsd4_free_slabs();
1293out_unregister_notifier:
1294 unregister_cld_notifier();
1295out_unregister_pernet:
1296 unregister_pernet_subsys(&nfsd_net_ops);
1297 return retval;
1298}
1299
1300static void __exit exit_nfsd(void)
1301{
1302 nfsd_reply_cache_shutdown();
1303 remove_proc_entry("fs/nfs/exports", NULL);
1304 remove_proc_entry("fs/nfs", NULL);
1305 nfsd_stat_shutdown();
1306 nfsd_lockd_shutdown();
1307 nfsd4_free_slabs();
1308 nfsd4_exit_pnfs();
1309 nfsd_fault_inject_cleanup();
1310 unregister_filesystem(&nfsd_fs_type);
1311 unregister_cld_notifier();
1312 unregister_pernet_subsys(&nfsd_net_ops);
1313}
1314
1315MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1316MODULE_LICENSE("GPL");
1317module_init(init_nfsd)
1318module_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)