2 * linux/fs/nfsd/nfsctl.c
4 * Syscall interface to knfsd.
6 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
9 #include <linux/module.h>
11 #include <linux/linkage.h>
12 #include <linux/time.h>
13 #include <linux/errno.h>
15 #include <linux/fcntl.h>
16 #include <linux/net.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>
38 #include <linux/nfsd/interface.h>
40 #include <asm/uaccess.h>
43 * We have a single directory with 9 nodes in it.
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
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);
86 static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
87 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
90 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
91 [NFSD_Svc] = write_svc,
92 [NFSD_Add] = write_add,
93 [NFSD_Del] = write_del,
94 [NFSD_Export] = write_export,
95 [NFSD_Unexport] = write_unexport,
96 [NFSD_Getfd] = write_getfd,
97 [NFSD_Getfs] = write_getfs,
98 [NFSD_Fh] = write_filehandle,
99 [NFSD_Threads] = write_threads,
100 [NFSD_Pool_Threads] = write_pool_threads,
101 [NFSD_Versions] = write_versions,
102 [NFSD_Ports] = write_ports,
103 #ifdef CONFIG_NFSD_V4
104 [NFSD_Leasetime] = write_leasetime,
105 [NFSD_RecoveryDir] = write_recoverydir,
109 static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
111 ino_t ino = file->f_dentry->d_inode->i_ino;
115 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
118 data = simple_transaction_get(file, buf, size);
120 return PTR_ERR(data);
122 rv = write_op[ino](file, data, size);
124 simple_transaction_set(file, rv);
130 static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
132 if (! file->private_data) {
133 /* An attempt to read a transaction file without writing
134 * causes a 0-byte write so that the file can return
137 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
141 return simple_transaction_read(file, buf, size, pos);
144 static const struct file_operations transaction_ops = {
145 .write = nfsctl_transaction_write,
146 .read = nfsctl_transaction_read,
147 .release = simple_transaction_release,
150 extern struct seq_operations nfs_exports_op;
151 static int exports_open(struct inode *inode, struct file *file)
153 return seq_open(file, &nfs_exports_op);
156 static const struct file_operations exports_operations = {
157 .open = exports_open,
160 .release = seq_release,
163 /*----------------------------------------------------------------------------*/
165 * payload - write methods
166 * If the method has a response, the response should be put in buf,
167 * and the length returned. Otherwise return 0 or and -error.
170 static ssize_t write_svc(struct file *file, char *buf, size_t size)
172 struct nfsctl_svc *data;
173 if (size < sizeof(*data))
175 data = (struct nfsctl_svc*) buf;
176 return nfsd_svc(data->svc_port, data->svc_nthreads);
179 static ssize_t write_add(struct file *file, char *buf, size_t size)
181 struct nfsctl_client *data;
182 if (size < sizeof(*data))
184 data = (struct nfsctl_client *)buf;
185 return exp_addclient(data);
188 static ssize_t write_del(struct file *file, char *buf, size_t size)
190 struct nfsctl_client *data;
191 if (size < sizeof(*data))
193 data = (struct nfsctl_client *)buf;
194 return exp_delclient(data);
197 static ssize_t write_export(struct file *file, char *buf, size_t size)
199 struct nfsctl_export *data;
200 if (size < sizeof(*data))
202 data = (struct nfsctl_export*)buf;
203 return exp_export(data);
206 static ssize_t write_unexport(struct file *file, char *buf, size_t size)
208 struct nfsctl_export *data;
210 if (size < sizeof(*data))
212 data = (struct nfsctl_export*)buf;
213 return exp_unexport(data);
216 static ssize_t write_getfs(struct file *file, char *buf, size_t size)
218 struct nfsctl_fsparm *data;
219 struct sockaddr_in *sin;
220 struct auth_domain *clp;
222 struct knfsd_fh *res;
224 if (size < sizeof(*data))
226 data = (struct nfsctl_fsparm*)buf;
227 err = -EPROTONOSUPPORT;
228 if (data->gd_addr.sa_family != AF_INET)
230 sin = (struct sockaddr_in *)&data->gd_addr;
231 if (data->gd_maxlen > NFS3_FHSIZE)
232 data->gd_maxlen = NFS3_FHSIZE;
234 res = (struct knfsd_fh*)buf;
237 if (!(clp = auth_unix_lookup(sin->sin_addr)))
240 err = exp_rootfh(clp, data->gd_path, res, data->gd_maxlen);
241 auth_domain_put(clp);
245 err = res->fh_size + (int)&((struct knfsd_fh*)0)->fh_base;
250 static ssize_t write_getfd(struct file *file, char *buf, size_t size)
252 struct nfsctl_fdparm *data;
253 struct sockaddr_in *sin;
254 struct auth_domain *clp;
259 if (size < sizeof(*data))
261 data = (struct nfsctl_fdparm*)buf;
262 err = -EPROTONOSUPPORT;
263 if (data->gd_addr.sa_family != AF_INET)
266 if (data->gd_version < 2 || data->gd_version > NFSSVC_MAXVERS)
270 sin = (struct sockaddr_in *)&data->gd_addr;
272 if (!(clp = auth_unix_lookup(sin->sin_addr)))
275 err = exp_rootfh(clp, data->gd_path, &fh, NFS_FHSIZE);
276 auth_domain_put(clp);
281 memset(res,0, NFS_FHSIZE);
282 memcpy(res, &fh.fh_base, fh.fh_size);
289 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
292 * domain path maxsize
296 * qword quoting is used, so filehandle will be \x....
302 struct auth_domain *dom;
305 if (buf[size-1] != '\n')
310 len = qword_get(&mesg, dname, size);
311 if (len <= 0) return -EINVAL;
314 len = qword_get(&mesg, path, size);
315 if (len <= 0) return -EINVAL;
317 len = get_int(&mesg, &maxsize);
321 if (maxsize < NFS_FHSIZE)
323 if (maxsize > NFS3_FHSIZE)
324 maxsize = NFS3_FHSIZE;
326 if (qword_get(&mesg, mesg, size)>0)
329 /* we have all the words, they are in buf.. */
330 dom = unix_domain_find(dname);
334 len = exp_rootfh(dom, path, &fh, maxsize);
335 auth_domain_put(dom);
339 mesg = buf; len = SIMPLE_TRANSACTION_LIMIT;
340 qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
345 extern int nfsd_nrthreads(void);
347 static ssize_t write_threads(struct file *file, char *buf, size_t size)
349 /* if size > 0, look for a number of threads and call nfsd_svc
350 * then write out number of threads as reply
356 rv = get_int(&mesg, &newthreads);
361 rv = nfsd_svc(2049, newthreads);
365 sprintf(buf, "%d\n", nfsd_nrthreads());
369 extern int nfsd_nrpools(void);
370 extern int nfsd_get_nrthreads(int n, int *);
371 extern int nfsd_set_nrthreads(int n, int *);
373 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
375 /* if size > 0, look for an array of number of threads per node
376 * and apply them then write out number of threads per node as reply
382 int npools = nfsd_nrpools();
387 * NFS is shut down. The admin can start it by
388 * writing to the threads file but NOT the pool_threads
389 * file, sorry. Report zero threads.
395 nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
396 if (nthreads == NULL)
400 for (i = 0; i < npools; i++) {
401 rv = get_int(&mesg, &nthreads[i]);
403 break; /* fewer numbers than pools */
405 goto out_free; /* syntax error */
410 rv = nfsd_set_nrthreads(i, nthreads);
415 rv = nfsd_get_nrthreads(npools, nthreads);
420 size = SIMPLE_TRANSACTION_LIMIT;
421 for (i = 0; i < npools && size > 0; i++) {
422 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
435 static ssize_t write_versions(struct file *file, char *buf, size_t size)
439 * [-/+]vers [-/+]vers ...
449 /* Cannot change versions without updating
450 * nfsd_serv->sv_xdrsize, and reallocing
451 * rq_argp and rq_resp
454 if (buf[size-1] != '\n')
459 len = qword_get(&mesg, vers, size);
460 if (len <= 0) return -EINVAL;
463 if (sign == '+' || sign == '-')
464 num = simple_strtol((vers+1), NULL, 0);
466 num = simple_strtol(vers, NULL, 0);
471 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
478 } while ((len = qword_get(&mesg, vers, size)) > 0);
479 /* If all get turned off, turn them back on, as
480 * having no versions is BAD
482 nfsd_reset_versions();
484 /* Now write current state into reply buffer */
487 for (num=2 ; num <= 4 ; num++)
488 if (nfsd_vers(num, NFSD_AVAIL)) {
489 len += sprintf(buf+len, "%s%c%d", sep,
490 nfsd_vers(num, NFSD_TEST)?'+':'-',
494 len += sprintf(buf+len, "\n");
498 static ssize_t write_ports(struct file *file, char *buf, size_t size)
504 len = svc_sock_names(buf, nfsd_serv, NULL);
508 /* Either a single 'fd' number is written, in which
509 * case it must be for a socket of a supported family/protocol,
510 * and we use it as an nfsd socket, or
511 * A '-' followed by the 'name' of a socket in which case
512 * we close the socket.
514 if (isdigit(buf[0])) {
518 err = get_int(&mesg, &fd);
523 err = nfsd_create_serv();
526 err = lockd_up(proto);
528 err = svc_addsock(nfsd_serv, fd, buf, &proto);
532 /* Decrease the count, but don't shutdown the
535 nfsd_serv->sv_nrthreads--;
540 char *toclose = kstrdup(buf+1, GFP_KERNEL);
546 len = svc_sock_names(buf, nfsd_serv, toclose);
554 #ifdef CONFIG_NFSD_V4
555 extern time_t nfs4_leasetime(void);
557 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
559 /* if size > 10 seconds, call
560 * nfs4_reset_lease() then write out the new lease (seconds) as reply
567 rv = get_int(&mesg, &lease);
570 if (lease < 10 || lease > 3600)
572 nfs4_reset_lease(lease);
574 sprintf(buf, "%ld\n", nfs4_lease_time());
578 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
584 if (size > PATH_MAX || buf[size-1] != '\n')
589 len = qword_get(&mesg, recdir, size);
593 status = nfs4_reset_recoverydir(recdir);
598 /*----------------------------------------------------------------------------*/
600 * populating the filesystem.
603 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
605 static struct tree_descr nfsd_files[] = {
606 [NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR},
607 [NFSD_Add] = {".add", &transaction_ops, S_IWUSR},
608 [NFSD_Del] = {".del", &transaction_ops, S_IWUSR},
609 [NFSD_Export] = {".export", &transaction_ops, S_IWUSR},
610 [NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR},
611 [NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR|S_IRUSR},
612 [NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR|S_IRUSR},
613 [NFSD_List] = {"exports", &exports_operations, S_IRUGO},
614 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
615 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
616 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
617 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
618 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
619 #ifdef CONFIG_NFSD_V4
620 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
621 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
625 return simple_fill_super(sb, 0x6e667364, nfsd_files);
628 static int nfsd_get_sb(struct file_system_type *fs_type,
629 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
631 return get_sb_single(fs_type, flags, data, nfsd_fill_super, mnt);
634 static struct file_system_type nfsd_fs_type = {
635 .owner = THIS_MODULE,
637 .get_sb = nfsd_get_sb,
638 .kill_sb = kill_litter_super,
641 static int __init init_nfsd(void)
644 printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
646 nfsd_stat_init(); /* Statistics */
647 nfsd_cache_init(); /* RPC reply cache */
648 nfsd_export_init(); /* Exports table */
649 nfsd_lockd_init(); /* lockd->nfsd callbacks */
650 nfs4_state_init(); /* NFSv4 locking state */
651 nfsd_idmap_init(); /* Name to ID mapping */
652 if (proc_mkdir("fs/nfs", NULL)) {
653 struct proc_dir_entry *entry;
654 entry = create_proc_entry("fs/nfs/exports", 0, NULL);
656 entry->proc_fops = &exports_operations;
658 retval = register_filesystem(&nfsd_fs_type);
660 nfsd_export_shutdown();
661 nfsd_cache_shutdown();
662 remove_proc_entry("fs/nfs/exports", NULL);
663 remove_proc_entry("fs/nfs", NULL);
664 nfsd_stat_shutdown();
665 nfsd_lockd_shutdown();
670 static void __exit exit_nfsd(void)
672 nfsd_export_shutdown();
673 nfsd_cache_shutdown();
674 remove_proc_entry("fs/nfs/exports", NULL);
675 remove_proc_entry("fs/nfs", NULL);
676 nfsd_stat_shutdown();
677 nfsd_lockd_shutdown();
678 nfsd_idmap_shutdown();
679 unregister_filesystem(&nfsd_fs_type);
682 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
683 MODULE_LICENSE("GPL");
684 module_init(init_nfsd)
685 module_exit(exit_nfsd)