sched: remove the 'u64 now' parameter from __enqueue_sleeper()
[usb.git] / fs / nfsd / nfsctl.c
blobbaac89d917ca9d708cbaf2b643414afb4e076e0e
1 /*
2 * linux/fs/nfsd/nfsctl.c
4 * Syscall interface to knfsd.
6 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
7 */
9 #include <linux/module.h>
11 #include <linux/linkage.h>
12 #include <linux/time.h>
13 #include <linux/errno.h>
14 #include <linux/fs.h>
15 #include <linux/fcntl.h>
16 #include <linux/net.h>
17 #include <linux/in.h>
18 #include <linux/syscalls.h>
19 #include <linux/unistd.h>
20 #include <linux/slab.h>
21 #include <linux/proc_fs.h>
22 #include <linux/seq_file.h>
23 #include <linux/pagemap.h>
24 #include <linux/init.h>
25 #include <linux/string.h>
26 #include <linux/smp_lock.h>
27 #include <linux/ctype.h>
29 #include <linux/nfs.h>
30 #include <linux/nfsd_idmap.h>
31 #include <linux/lockd/bind.h>
32 #include <linux/sunrpc/svc.h>
33 #include <linux/sunrpc/svcsock.h>
34 #include <linux/nfsd/nfsd.h>
35 #include <linux/nfsd/cache.h>
36 #include <linux/nfsd/xdr.h>
37 #include <linux/nfsd/syscall.h>
39 #include <asm/uaccess.h>
42 * We have a single directory with 9 nodes in it.
44 enum {
45 NFSD_Root = 1,
46 NFSD_Svc,
47 NFSD_Add,
48 NFSD_Del,
49 NFSD_Export,
50 NFSD_Unexport,
51 NFSD_Getfd,
52 NFSD_Getfs,
53 NFSD_List,
54 NFSD_Fh,
55 NFSD_Threads,
56 NFSD_Pool_Threads,
57 NFSD_Versions,
58 NFSD_Ports,
59 NFSD_MaxBlkSize,
61 * The below MUST come last. Otherwise we leave a hole in nfsd_files[]
62 * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
64 #ifdef CONFIG_NFSD_V4
65 NFSD_Leasetime,
66 NFSD_RecoveryDir,
67 #endif
71 * write() for these nodes.
73 static ssize_t write_svc(struct file *file, char *buf, size_t size);
74 static ssize_t write_add(struct file *file, char *buf, size_t size);
75 static ssize_t write_del(struct file *file, char *buf, size_t size);
76 static ssize_t write_export(struct file *file, char *buf, size_t size);
77 static ssize_t write_unexport(struct file *file, char *buf, size_t size);
78 static ssize_t write_getfd(struct file *file, char *buf, size_t size);
79 static ssize_t write_getfs(struct file *file, char *buf, size_t size);
80 static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
81 static ssize_t write_threads(struct file *file, char *buf, size_t size);
82 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
83 static ssize_t write_versions(struct file *file, char *buf, size_t size);
84 static ssize_t write_ports(struct file *file, char *buf, size_t size);
85 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
86 #ifdef CONFIG_NFSD_V4
87 static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
88 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
89 #endif
91 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
92 [NFSD_Svc] = write_svc,
93 [NFSD_Add] = write_add,
94 [NFSD_Del] = write_del,
95 [NFSD_Export] = write_export,
96 [NFSD_Unexport] = write_unexport,
97 [NFSD_Getfd] = write_getfd,
98 [NFSD_Getfs] = write_getfs,
99 [NFSD_Fh] = write_filehandle,
100 [NFSD_Threads] = write_threads,
101 [NFSD_Pool_Threads] = write_pool_threads,
102 [NFSD_Versions] = write_versions,
103 [NFSD_Ports] = write_ports,
104 [NFSD_MaxBlkSize] = write_maxblksize,
105 #ifdef CONFIG_NFSD_V4
106 [NFSD_Leasetime] = write_leasetime,
107 [NFSD_RecoveryDir] = write_recoverydir,
108 #endif
111 static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
113 ino_t ino = file->f_path.dentry->d_inode->i_ino;
114 char *data;
115 ssize_t rv;
117 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
118 return -EINVAL;
120 data = simple_transaction_get(file, buf, size);
121 if (IS_ERR(data))
122 return PTR_ERR(data);
124 rv = write_op[ino](file, data, size);
125 if (rv >= 0) {
126 simple_transaction_set(file, rv);
127 rv = size;
129 return rv;
132 static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
134 if (! file->private_data) {
135 /* An attempt to read a transaction file without writing
136 * causes a 0-byte write so that the file can return
137 * state information
139 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
140 if (rv < 0)
141 return rv;
143 return simple_transaction_read(file, buf, size, pos);
146 static const struct file_operations transaction_ops = {
147 .write = nfsctl_transaction_write,
148 .read = nfsctl_transaction_read,
149 .release = simple_transaction_release,
152 extern struct seq_operations nfs_exports_op;
153 static int exports_open(struct inode *inode, struct file *file)
155 return seq_open(file, &nfs_exports_op);
158 static const struct file_operations exports_operations = {
159 .open = exports_open,
160 .read = seq_read,
161 .llseek = seq_lseek,
162 .release = seq_release,
165 /*----------------------------------------------------------------------------*/
167 * payload - write methods
168 * If the method has a response, the response should be put in buf,
169 * and the length returned. Otherwise return 0 or and -error.
172 static ssize_t write_svc(struct file *file, char *buf, size_t size)
174 struct nfsctl_svc *data;
175 if (size < sizeof(*data))
176 return -EINVAL;
177 data = (struct nfsctl_svc*) buf;
178 return nfsd_svc(data->svc_port, data->svc_nthreads);
181 static ssize_t write_add(struct file *file, char *buf, size_t size)
183 struct nfsctl_client *data;
184 if (size < sizeof(*data))
185 return -EINVAL;
186 data = (struct nfsctl_client *)buf;
187 return exp_addclient(data);
190 static ssize_t write_del(struct file *file, char *buf, size_t size)
192 struct nfsctl_client *data;
193 if (size < sizeof(*data))
194 return -EINVAL;
195 data = (struct nfsctl_client *)buf;
196 return exp_delclient(data);
199 static ssize_t write_export(struct file *file, char *buf, size_t size)
201 struct nfsctl_export *data;
202 if (size < sizeof(*data))
203 return -EINVAL;
204 data = (struct nfsctl_export*)buf;
205 return exp_export(data);
208 static ssize_t write_unexport(struct file *file, char *buf, size_t size)
210 struct nfsctl_export *data;
212 if (size < sizeof(*data))
213 return -EINVAL;
214 data = (struct nfsctl_export*)buf;
215 return exp_unexport(data);
218 static ssize_t write_getfs(struct file *file, char *buf, size_t size)
220 struct nfsctl_fsparm *data;
221 struct sockaddr_in *sin;
222 struct auth_domain *clp;
223 int err = 0;
224 struct knfsd_fh *res;
226 if (size < sizeof(*data))
227 return -EINVAL;
228 data = (struct nfsctl_fsparm*)buf;
229 err = -EPROTONOSUPPORT;
230 if (data->gd_addr.sa_family != AF_INET)
231 goto out;
232 sin = (struct sockaddr_in *)&data->gd_addr;
233 if (data->gd_maxlen > NFS3_FHSIZE)
234 data->gd_maxlen = NFS3_FHSIZE;
236 res = (struct knfsd_fh*)buf;
238 exp_readlock();
239 if (!(clp = auth_unix_lookup(sin->sin_addr)))
240 err = -EPERM;
241 else {
242 err = exp_rootfh(clp, data->gd_path, res, data->gd_maxlen);
243 auth_domain_put(clp);
245 exp_readunlock();
246 if (err == 0)
247 err = res->fh_size + offsetof(struct knfsd_fh, fh_base);
248 out:
249 return err;
252 static ssize_t write_getfd(struct file *file, char *buf, size_t size)
254 struct nfsctl_fdparm *data;
255 struct sockaddr_in *sin;
256 struct auth_domain *clp;
257 int err = 0;
258 struct knfsd_fh fh;
259 char *res;
261 if (size < sizeof(*data))
262 return -EINVAL;
263 data = (struct nfsctl_fdparm*)buf;
264 err = -EPROTONOSUPPORT;
265 if (data->gd_addr.sa_family != AF_INET)
266 goto out;
267 err = -EINVAL;
268 if (data->gd_version < 2 || data->gd_version > NFSSVC_MAXVERS)
269 goto out;
271 res = buf;
272 sin = (struct sockaddr_in *)&data->gd_addr;
273 exp_readlock();
274 if (!(clp = auth_unix_lookup(sin->sin_addr)))
275 err = -EPERM;
276 else {
277 err = exp_rootfh(clp, data->gd_path, &fh, NFS_FHSIZE);
278 auth_domain_put(clp);
280 exp_readunlock();
282 if (err == 0) {
283 memset(res,0, NFS_FHSIZE);
284 memcpy(res, &fh.fh_base, fh.fh_size);
285 err = NFS_FHSIZE;
287 out:
288 return err;
291 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
293 /* request is:
294 * domain path maxsize
295 * response is
296 * filehandle
298 * qword quoting is used, so filehandle will be \x....
300 char *dname, *path;
301 int maxsize;
302 char *mesg = buf;
303 int len;
304 struct auth_domain *dom;
305 struct knfsd_fh fh;
307 if (buf[size-1] != '\n')
308 return -EINVAL;
309 buf[size-1] = 0;
311 dname = mesg;
312 len = qword_get(&mesg, dname, size);
313 if (len <= 0) return -EINVAL;
315 path = dname+len+1;
316 len = qword_get(&mesg, path, size);
317 if (len <= 0) return -EINVAL;
319 len = get_int(&mesg, &maxsize);
320 if (len)
321 return len;
323 if (maxsize < NFS_FHSIZE)
324 return -EINVAL;
325 if (maxsize > NFS3_FHSIZE)
326 maxsize = NFS3_FHSIZE;
328 if (qword_get(&mesg, mesg, size)>0)
329 return -EINVAL;
331 /* we have all the words, they are in buf.. */
332 dom = unix_domain_find(dname);
333 if (!dom)
334 return -ENOMEM;
336 len = exp_rootfh(dom, path, &fh, maxsize);
337 auth_domain_put(dom);
338 if (len)
339 return len;
341 mesg = buf; len = SIMPLE_TRANSACTION_LIMIT;
342 qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
343 mesg[-1] = '\n';
344 return mesg - buf;
347 extern int nfsd_nrthreads(void);
349 static ssize_t write_threads(struct file *file, char *buf, size_t size)
351 /* if size > 0, look for a number of threads and call nfsd_svc
352 * then write out number of threads as reply
354 char *mesg = buf;
355 int rv;
356 if (size > 0) {
357 int newthreads;
358 rv = get_int(&mesg, &newthreads);
359 if (rv)
360 return rv;
361 if (newthreads <0)
362 return -EINVAL;
363 rv = nfsd_svc(2049, newthreads);
364 if (rv)
365 return rv;
367 sprintf(buf, "%d\n", nfsd_nrthreads());
368 return strlen(buf);
371 extern int nfsd_nrpools(void);
372 extern int nfsd_get_nrthreads(int n, int *);
373 extern int nfsd_set_nrthreads(int n, int *);
375 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
377 /* if size > 0, look for an array of number of threads per node
378 * and apply them then write out number of threads per node as reply
380 char *mesg = buf;
381 int i;
382 int rv;
383 int len;
384 int npools = nfsd_nrpools();
385 int *nthreads;
387 if (npools == 0) {
389 * NFS is shut down. The admin can start it by
390 * writing to the threads file but NOT the pool_threads
391 * file, sorry. Report zero threads.
393 strcpy(buf, "0\n");
394 return strlen(buf);
397 nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
398 if (nthreads == NULL)
399 return -ENOMEM;
401 if (size > 0) {
402 for (i = 0; i < npools; i++) {
403 rv = get_int(&mesg, &nthreads[i]);
404 if (rv == -ENOENT)
405 break; /* fewer numbers than pools */
406 if (rv)
407 goto out_free; /* syntax error */
408 rv = -EINVAL;
409 if (nthreads[i] < 0)
410 goto out_free;
412 rv = nfsd_set_nrthreads(i, nthreads);
413 if (rv)
414 goto out_free;
417 rv = nfsd_get_nrthreads(npools, nthreads);
418 if (rv)
419 goto out_free;
421 mesg = buf;
422 size = SIMPLE_TRANSACTION_LIMIT;
423 for (i = 0; i < npools && size > 0; i++) {
424 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
425 len = strlen(mesg);
426 size -= len;
427 mesg += len;
430 return (mesg-buf);
432 out_free:
433 kfree(nthreads);
434 return rv;
437 static ssize_t write_versions(struct file *file, char *buf, size_t size)
440 * Format:
441 * [-/+]vers [-/+]vers ...
443 char *mesg = buf;
444 char *vers, sign;
445 int len, num;
446 ssize_t tlen = 0;
447 char *sep;
449 if (size>0) {
450 if (nfsd_serv)
451 /* Cannot change versions without updating
452 * nfsd_serv->sv_xdrsize, and reallocing
453 * rq_argp and rq_resp
455 return -EBUSY;
456 if (buf[size-1] != '\n')
457 return -EINVAL;
458 buf[size-1] = 0;
460 vers = mesg;
461 len = qword_get(&mesg, vers, size);
462 if (len <= 0) return -EINVAL;
463 do {
464 sign = *vers;
465 if (sign == '+' || sign == '-')
466 num = simple_strtol((vers+1), NULL, 0);
467 else
468 num = simple_strtol(vers, NULL, 0);
469 switch(num) {
470 case 2:
471 case 3:
472 case 4:
473 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
474 break;
475 default:
476 return -EINVAL;
478 vers += len + 1;
479 tlen += len;
480 } while ((len = qword_get(&mesg, vers, size)) > 0);
481 /* If all get turned off, turn them back on, as
482 * having no versions is BAD
484 nfsd_reset_versions();
486 /* Now write current state into reply buffer */
487 len = 0;
488 sep = "";
489 for (num=2 ; num <= 4 ; num++)
490 if (nfsd_vers(num, NFSD_AVAIL)) {
491 len += sprintf(buf+len, "%s%c%d", sep,
492 nfsd_vers(num, NFSD_TEST)?'+':'-',
493 num);
494 sep = " ";
496 len += sprintf(buf+len, "\n");
497 return len;
500 static ssize_t write_ports(struct file *file, char *buf, size_t size)
502 if (size == 0) {
503 int len = 0;
504 lock_kernel();
505 if (nfsd_serv)
506 len = svc_sock_names(buf, nfsd_serv, NULL);
507 unlock_kernel();
508 return len;
510 /* Either a single 'fd' number is written, in which
511 * case it must be for a socket of a supported family/protocol,
512 * and we use it as an nfsd socket, or
513 * A '-' followed by the 'name' of a socket in which case
514 * we close the socket.
516 if (isdigit(buf[0])) {
517 char *mesg = buf;
518 int fd;
519 int err;
520 err = get_int(&mesg, &fd);
521 if (err)
522 return -EINVAL;
523 if (fd < 0)
524 return -EINVAL;
525 err = nfsd_create_serv();
526 if (!err) {
527 int proto = 0;
528 err = svc_addsock(nfsd_serv, fd, buf, &proto);
529 if (err >= 0) {
530 err = lockd_up(proto);
531 if (err < 0)
532 svc_sock_names(buf+strlen(buf)+1, nfsd_serv, buf);
534 /* Decrease the count, but don't shutdown the
535 * the service
537 lock_kernel();
538 nfsd_serv->sv_nrthreads--;
539 unlock_kernel();
541 return err < 0 ? err : 0;
543 if (buf[0] == '-') {
544 char *toclose = kstrdup(buf+1, GFP_KERNEL);
545 int len = 0;
546 if (!toclose)
547 return -ENOMEM;
548 lock_kernel();
549 if (nfsd_serv)
550 len = svc_sock_names(buf, nfsd_serv, toclose);
551 unlock_kernel();
552 if (len >= 0)
553 lockd_down();
554 kfree(toclose);
555 return len;
557 return -EINVAL;
560 int nfsd_max_blksize;
562 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
564 char *mesg = buf;
565 if (size > 0) {
566 int bsize;
567 int rv = get_int(&mesg, &bsize);
568 if (rv)
569 return rv;
570 /* force bsize into allowed range and
571 * required alignment.
573 if (bsize < 1024)
574 bsize = 1024;
575 if (bsize > NFSSVC_MAXBLKSIZE)
576 bsize = NFSSVC_MAXBLKSIZE;
577 bsize &= ~(1024-1);
578 lock_kernel();
579 if (nfsd_serv && nfsd_serv->sv_nrthreads) {
580 unlock_kernel();
581 return -EBUSY;
583 nfsd_max_blksize = bsize;
584 unlock_kernel();
586 return sprintf(buf, "%d\n", nfsd_max_blksize);
589 #ifdef CONFIG_NFSD_V4
590 extern time_t nfs4_leasetime(void);
592 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
594 /* if size > 10 seconds, call
595 * nfs4_reset_lease() then write out the new lease (seconds) as reply
597 char *mesg = buf;
598 int rv;
600 if (size > 0) {
601 int lease;
602 rv = get_int(&mesg, &lease);
603 if (rv)
604 return rv;
605 if (lease < 10 || lease > 3600)
606 return -EINVAL;
607 nfs4_reset_lease(lease);
609 sprintf(buf, "%ld\n", nfs4_lease_time());
610 return strlen(buf);
613 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
615 char *mesg = buf;
616 char *recdir;
617 int len, status;
619 if (size > PATH_MAX || buf[size-1] != '\n')
620 return -EINVAL;
621 buf[size-1] = 0;
623 recdir = mesg;
624 len = qword_get(&mesg, recdir, size);
625 if (len <= 0)
626 return -EINVAL;
628 status = nfs4_reset_recoverydir(recdir);
629 return strlen(buf);
631 #endif
633 /*----------------------------------------------------------------------------*/
635 * populating the filesystem.
638 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
640 static struct tree_descr nfsd_files[] = {
641 [NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR},
642 [NFSD_Add] = {".add", &transaction_ops, S_IWUSR},
643 [NFSD_Del] = {".del", &transaction_ops, S_IWUSR},
644 [NFSD_Export] = {".export", &transaction_ops, S_IWUSR},
645 [NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR},
646 [NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR|S_IRUSR},
647 [NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR|S_IRUSR},
648 [NFSD_List] = {"exports", &exports_operations, S_IRUGO},
649 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
650 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
651 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
652 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
653 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
654 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
655 #ifdef CONFIG_NFSD_V4
656 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
657 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
658 #endif
659 /* last one */ {""}
661 return simple_fill_super(sb, 0x6e667364, nfsd_files);
664 static int nfsd_get_sb(struct file_system_type *fs_type,
665 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
667 return get_sb_single(fs_type, flags, data, nfsd_fill_super, mnt);
670 static struct file_system_type nfsd_fs_type = {
671 .owner = THIS_MODULE,
672 .name = "nfsd",
673 .get_sb = nfsd_get_sb,
674 .kill_sb = kill_litter_super,
677 static int __init init_nfsd(void)
679 int retval;
680 printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
682 nfsd_stat_init(); /* Statistics */
683 nfsd_cache_init(); /* RPC reply cache */
684 nfsd_export_init(); /* Exports table */
685 nfsd_lockd_init(); /* lockd->nfsd callbacks */
686 nfs4_state_init(); /* NFSv4 locking state */
687 nfsd_idmap_init(); /* Name to ID mapping */
688 if (proc_mkdir("fs/nfs", NULL)) {
689 struct proc_dir_entry *entry;
690 entry = create_proc_entry("fs/nfs/exports", 0, NULL);
691 if (entry)
692 entry->proc_fops = &exports_operations;
694 retval = register_filesystem(&nfsd_fs_type);
695 if (retval) {
696 nfsd_export_shutdown();
697 nfsd_cache_shutdown();
698 remove_proc_entry("fs/nfs/exports", NULL);
699 remove_proc_entry("fs/nfs", NULL);
700 nfsd_stat_shutdown();
701 nfsd_lockd_shutdown();
703 return retval;
706 static void __exit exit_nfsd(void)
708 nfsd_export_shutdown();
709 nfsd_cache_shutdown();
710 remove_proc_entry("fs/nfs/exports", NULL);
711 remove_proc_entry("fs/nfs", NULL);
712 nfsd_stat_shutdown();
713 nfsd_lockd_shutdown();
714 nfsd_idmap_shutdown();
715 unregister_filesystem(&nfsd_fs_type);
718 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
719 MODULE_LICENSE("GPL");
720 module_init(init_nfsd)
721 module_exit(exit_nfsd)