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>
39 #include <asm/uaccess.h>
42 * 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
);
85 static ssize_t
write_maxblksize(struct file
*file
, char *buf
, size_t size
);
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
);
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
,
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
;
117 if (ino
>= ARRAY_SIZE(write_op
) || !write_op
[ino
])
120 data
= simple_transaction_get(file
, buf
, size
);
122 return PTR_ERR(data
);
124 rv
= write_op
[ino
](file
, data
, size
);
126 simple_transaction_set(file
, 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
139 ssize_t rv
= nfsctl_transaction_write(file
, buf
, 0, pos
);
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
,
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
))
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
))
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
))
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
))
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
))
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
;
224 struct knfsd_fh
*res
;
226 if (size
< sizeof(*data
))
228 data
= (struct nfsctl_fsparm
*)buf
;
229 err
= -EPROTONOSUPPORT
;
230 if (data
->gd_addr
.sa_family
!= AF_INET
)
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
;
239 if (!(clp
= auth_unix_lookup(sin
->sin_addr
)))
242 err
= exp_rootfh(clp
, data
->gd_path
, res
, data
->gd_maxlen
);
243 auth_domain_put(clp
);
247 err
= res
->fh_size
+ offsetof(struct knfsd_fh
, fh_base
);
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
;
261 if (size
< sizeof(*data
))
263 data
= (struct nfsctl_fdparm
*)buf
;
264 err
= -EPROTONOSUPPORT
;
265 if (data
->gd_addr
.sa_family
!= AF_INET
)
268 if (data
->gd_version
< 2 || data
->gd_version
> NFSSVC_MAXVERS
)
272 sin
= (struct sockaddr_in
*)&data
->gd_addr
;
274 if (!(clp
= auth_unix_lookup(sin
->sin_addr
)))
277 err
= exp_rootfh(clp
, data
->gd_path
, &fh
, NFS_FHSIZE
);
278 auth_domain_put(clp
);
283 memset(res
,0, NFS_FHSIZE
);
284 memcpy(res
, &fh
.fh_base
, fh
.fh_size
);
291 static ssize_t
write_filehandle(struct file
*file
, char *buf
, size_t size
)
294 * domain path maxsize
298 * qword quoting is used, so filehandle will be \x....
301 int uninitialized_var(maxsize
);
304 struct auth_domain
*dom
;
307 if (buf
[size
-1] != '\n')
312 len
= qword_get(&mesg
, dname
, size
);
313 if (len
<= 0) return -EINVAL
;
316 len
= qword_get(&mesg
, path
, size
);
317 if (len
<= 0) return -EINVAL
;
319 len
= get_int(&mesg
, &maxsize
);
323 if (maxsize
< NFS_FHSIZE
)
325 if (maxsize
> NFS3_FHSIZE
)
326 maxsize
= NFS3_FHSIZE
;
328 if (qword_get(&mesg
, mesg
, size
)>0)
331 /* we have all the words, they are in buf.. */
332 dom
= unix_domain_find(dname
);
336 len
= exp_rootfh(dom
, path
, &fh
, maxsize
);
337 auth_domain_put(dom
);
341 mesg
= buf
; len
= SIMPLE_TRANSACTION_LIMIT
;
342 qword_addhex(&mesg
, &len
, (char*)&fh
.fh_base
, fh
.fh_size
);
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
358 rv
= get_int(&mesg
, &newthreads
);
363 rv
= nfsd_svc(2049, newthreads
);
367 sprintf(buf
, "%d\n", nfsd_nrthreads());
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
384 int npools
= nfsd_nrpools();
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.
397 nthreads
= kcalloc(npools
, sizeof(int), GFP_KERNEL
);
398 if (nthreads
== NULL
)
402 for (i
= 0; i
< npools
; i
++) {
403 rv
= get_int(&mesg
, &nthreads
[i
]);
405 break; /* fewer numbers than pools */
407 goto out_free
; /* syntax error */
412 rv
= nfsd_set_nrthreads(i
, nthreads
);
417 rv
= nfsd_get_nrthreads(npools
, nthreads
);
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' : ' '));
437 static ssize_t
write_versions(struct file
*file
, char *buf
, size_t size
)
441 * [-/+]vers [-/+]vers ...
451 /* Cannot change versions without updating
452 * nfsd_serv->sv_xdrsize, and reallocing
453 * rq_argp and rq_resp
456 if (buf
[size
-1] != '\n')
461 len
= qword_get(&mesg
, vers
, size
);
462 if (len
<= 0) return -EINVAL
;
465 if (sign
== '+' || sign
== '-')
466 num
= simple_strtol((vers
+1), NULL
, 0);
468 num
= simple_strtol(vers
, NULL
, 0);
473 nfsd_vers(num
, sign
== '-' ? NFSD_CLEAR
: NFSD_SET
);
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 */
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
)?'+':'-',
496 len
+= sprintf(buf
+len
, "\n");
500 static ssize_t
write_ports(struct file
*file
, char *buf
, size_t size
)
506 len
= svc_sock_names(buf
, nfsd_serv
, NULL
);
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])) {
520 err
= get_int(&mesg
, &fd
);
525 err
= nfsd_create_serv();
528 err
= svc_addsock(nfsd_serv
, fd
, buf
, &proto
);
530 err
= lockd_up(proto
);
532 svc_sock_names(buf
+strlen(buf
)+1, nfsd_serv
, buf
);
534 /* Decrease the count, but don't shutdown the
538 nfsd_serv
->sv_nrthreads
--;
541 return err
< 0 ? err
: 0;
543 if (buf
[0] == '-' && isdigit(buf
[1])) {
544 char *toclose
= kstrdup(buf
+1, GFP_KERNEL
);
550 len
= svc_sock_names(buf
, nfsd_serv
, toclose
);
558 * Add a transport listener by writing it's transport name
560 if (isalpha(buf
[0])) {
564 if (sscanf(buf
, "%15s %4d", transport
, &port
) == 2) {
565 err
= nfsd_create_serv();
567 err
= svc_create_xprt(nfsd_serv
,
571 /* Give a reasonable perror msg for
572 * bad transport string */
573 err
= -EPROTONOSUPPORT
;
575 return err
< 0 ? err
: 0;
579 * Remove a transport by writing it's transport name and port number
581 if (buf
[0] == '-' && isalpha(buf
[1])) {
582 struct svc_xprt
*xprt
;
586 if (sscanf(&buf
[1], "%15s %4d", transport
, &port
) == 2) {
591 xprt
= svc_find_xprt(nfsd_serv
, transport
,
594 svc_close_xprt(xprt
);
601 return err
< 0 ? err
: 0;
607 int nfsd_max_blksize
;
609 static ssize_t
write_maxblksize(struct file
*file
, char *buf
, size_t size
)
614 int rv
= get_int(&mesg
, &bsize
);
617 /* force bsize into allowed range and
618 * required alignment.
622 if (bsize
> NFSSVC_MAXBLKSIZE
)
623 bsize
= NFSSVC_MAXBLKSIZE
;
626 if (nfsd_serv
&& nfsd_serv
->sv_nrthreads
) {
630 nfsd_max_blksize
= bsize
;
633 return sprintf(buf
, "%d\n", nfsd_max_blksize
);
636 #ifdef CONFIG_NFSD_V4
637 extern time_t nfs4_leasetime(void);
639 static ssize_t
write_leasetime(struct file
*file
, char *buf
, size_t size
)
641 /* if size > 10 seconds, call
642 * nfs4_reset_lease() then write out the new lease (seconds) as reply
649 rv
= get_int(&mesg
, &lease
);
652 if (lease
< 10 || lease
> 3600)
654 nfs4_reset_lease(lease
);
656 sprintf(buf
, "%ld\n", nfs4_lease_time());
660 static ssize_t
write_recoverydir(struct file
*file
, char *buf
, size_t size
)
666 if (size
> PATH_MAX
|| buf
[size
-1] != '\n')
671 len
= qword_get(&mesg
, recdir
, size
);
675 status
= nfs4_reset_recoverydir(recdir
);
680 /*----------------------------------------------------------------------------*/
682 * populating the filesystem.
685 static int nfsd_fill_super(struct super_block
* sb
, void * data
, int silent
)
687 static struct tree_descr nfsd_files
[] = {
688 [NFSD_Svc
] = {".svc", &transaction_ops
, S_IWUSR
},
689 [NFSD_Add
] = {".add", &transaction_ops
, S_IWUSR
},
690 [NFSD_Del
] = {".del", &transaction_ops
, S_IWUSR
},
691 [NFSD_Export
] = {".export", &transaction_ops
, S_IWUSR
},
692 [NFSD_Unexport
] = {".unexport", &transaction_ops
, S_IWUSR
},
693 [NFSD_Getfd
] = {".getfd", &transaction_ops
, S_IWUSR
|S_IRUSR
},
694 [NFSD_Getfs
] = {".getfs", &transaction_ops
, S_IWUSR
|S_IRUSR
},
695 [NFSD_List
] = {"exports", &exports_operations
, S_IRUGO
},
696 [NFSD_Fh
] = {"filehandle", &transaction_ops
, S_IWUSR
|S_IRUSR
},
697 [NFSD_Threads
] = {"threads", &transaction_ops
, S_IWUSR
|S_IRUSR
},
698 [NFSD_Pool_Threads
] = {"pool_threads", &transaction_ops
, S_IWUSR
|S_IRUSR
},
699 [NFSD_Versions
] = {"versions", &transaction_ops
, S_IWUSR
|S_IRUSR
},
700 [NFSD_Ports
] = {"portlist", &transaction_ops
, S_IWUSR
|S_IRUGO
},
701 [NFSD_MaxBlkSize
] = {"max_block_size", &transaction_ops
, S_IWUSR
|S_IRUGO
},
702 #ifdef CONFIG_NFSD_V4
703 [NFSD_Leasetime
] = {"nfsv4leasetime", &transaction_ops
, S_IWUSR
|S_IRUSR
},
704 [NFSD_RecoveryDir
] = {"nfsv4recoverydir", &transaction_ops
, S_IWUSR
|S_IRUSR
},
708 return simple_fill_super(sb
, 0x6e667364, nfsd_files
);
711 static int nfsd_get_sb(struct file_system_type
*fs_type
,
712 int flags
, const char *dev_name
, void *data
, struct vfsmount
*mnt
)
714 return get_sb_single(fs_type
, flags
, data
, nfsd_fill_super
, mnt
);
717 static struct file_system_type nfsd_fs_type
= {
718 .owner
= THIS_MODULE
,
720 .get_sb
= nfsd_get_sb
,
721 .kill_sb
= kill_litter_super
,
724 #ifdef CONFIG_PROC_FS
725 static int create_proc_exports_entry(void)
727 struct proc_dir_entry
*entry
;
729 entry
= proc_mkdir("fs/nfs", NULL
);
732 entry
= create_proc_entry("fs/nfs/exports", 0, NULL
);
735 entry
->proc_fops
= &exports_operations
;
738 #else /* CONFIG_PROC_FS */
739 static int create_proc_exports_entry(void)
745 static int __init
init_nfsd(void)
748 printk(KERN_INFO
"Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
750 retval
= nfs4_state_init(); /* nfs4 locking state */
753 nfsd_stat_init(); /* Statistics */
754 retval
= nfsd_reply_cache_init();
757 retval
= nfsd_export_init();
760 nfsd_lockd_init(); /* lockd->nfsd callbacks */
761 retval
= nfsd_idmap_init();
764 retval
= create_proc_exports_entry();
767 retval
= register_filesystem(&nfsd_fs_type
);
772 remove_proc_entry("fs/nfs/exports", NULL
);
773 remove_proc_entry("fs/nfs", NULL
);
775 nfsd_idmap_shutdown();
777 nfsd_lockd_shutdown();
778 nfsd_export_shutdown();
780 nfsd_reply_cache_shutdown();
782 nfsd_stat_shutdown();
787 static void __exit
exit_nfsd(void)
789 nfsd_export_shutdown();
790 nfsd_reply_cache_shutdown();
791 remove_proc_entry("fs/nfs/exports", NULL
);
792 remove_proc_entry("fs/nfs", NULL
);
793 nfsd_stat_shutdown();
794 nfsd_lockd_shutdown();
795 nfsd_idmap_shutdown();
797 unregister_filesystem(&nfsd_fs_type
);
800 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
801 MODULE_LICENSE("GPL");
802 module_init(init_nfsd
)
803 module_exit(exit_nfsd
)