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
= svc_addsock(nfsd_serv
, fd
, buf
, &proto
);
528 err
= lockd_up(proto
);
530 svc_sock_names(buf
+strlen(buf
)+1, nfsd_serv
, buf
);
532 /* Decrease the count, but don't shutdown the
536 nfsd_serv
->sv_nrthreads
--;
539 return err
< 0 ? err
: 0;
542 char *toclose
= kstrdup(buf
+1, GFP_KERNEL
);
548 len
= svc_sock_names(buf
, nfsd_serv
, toclose
);
558 #ifdef CONFIG_NFSD_V4
559 extern time_t nfs4_leasetime(void);
561 static ssize_t
write_leasetime(struct file
*file
, char *buf
, size_t size
)
563 /* if size > 10 seconds, call
564 * nfs4_reset_lease() then write out the new lease (seconds) as reply
571 rv
= get_int(&mesg
, &lease
);
574 if (lease
< 10 || lease
> 3600)
576 nfs4_reset_lease(lease
);
578 sprintf(buf
, "%ld\n", nfs4_lease_time());
582 static ssize_t
write_recoverydir(struct file
*file
, char *buf
, size_t size
)
588 if (size
> PATH_MAX
|| buf
[size
-1] != '\n')
593 len
= qword_get(&mesg
, recdir
, size
);
597 status
= nfs4_reset_recoverydir(recdir
);
602 /*----------------------------------------------------------------------------*/
604 * populating the filesystem.
607 static int nfsd_fill_super(struct super_block
* sb
, void * data
, int silent
)
609 static struct tree_descr nfsd_files
[] = {
610 [NFSD_Svc
] = {".svc", &transaction_ops
, S_IWUSR
},
611 [NFSD_Add
] = {".add", &transaction_ops
, S_IWUSR
},
612 [NFSD_Del
] = {".del", &transaction_ops
, S_IWUSR
},
613 [NFSD_Export
] = {".export", &transaction_ops
, S_IWUSR
},
614 [NFSD_Unexport
] = {".unexport", &transaction_ops
, S_IWUSR
},
615 [NFSD_Getfd
] = {".getfd", &transaction_ops
, S_IWUSR
|S_IRUSR
},
616 [NFSD_Getfs
] = {".getfs", &transaction_ops
, S_IWUSR
|S_IRUSR
},
617 [NFSD_List
] = {"exports", &exports_operations
, S_IRUGO
},
618 [NFSD_Fh
] = {"filehandle", &transaction_ops
, S_IWUSR
|S_IRUSR
},
619 [NFSD_Threads
] = {"threads", &transaction_ops
, S_IWUSR
|S_IRUSR
},
620 [NFSD_Pool_Threads
] = {"pool_threads", &transaction_ops
, S_IWUSR
|S_IRUSR
},
621 [NFSD_Versions
] = {"versions", &transaction_ops
, S_IWUSR
|S_IRUSR
},
622 [NFSD_Ports
] = {"portlist", &transaction_ops
, S_IWUSR
|S_IRUGO
},
623 #ifdef CONFIG_NFSD_V4
624 [NFSD_Leasetime
] = {"nfsv4leasetime", &transaction_ops
, S_IWUSR
|S_IRUSR
},
625 [NFSD_RecoveryDir
] = {"nfsv4recoverydir", &transaction_ops
, S_IWUSR
|S_IRUSR
},
629 return simple_fill_super(sb
, 0x6e667364, nfsd_files
);
632 static int nfsd_get_sb(struct file_system_type
*fs_type
,
633 int flags
, const char *dev_name
, void *data
, struct vfsmount
*mnt
)
635 return get_sb_single(fs_type
, flags
, data
, nfsd_fill_super
, mnt
);
638 static struct file_system_type nfsd_fs_type
= {
639 .owner
= THIS_MODULE
,
641 .get_sb
= nfsd_get_sb
,
642 .kill_sb
= kill_litter_super
,
645 static int __init
init_nfsd(void)
648 printk(KERN_INFO
"Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
650 nfsd_stat_init(); /* Statistics */
651 nfsd_cache_init(); /* RPC reply cache */
652 nfsd_export_init(); /* Exports table */
653 nfsd_lockd_init(); /* lockd->nfsd callbacks */
654 nfs4_state_init(); /* NFSv4 locking state */
655 nfsd_idmap_init(); /* Name to ID mapping */
656 if (proc_mkdir("fs/nfs", NULL
)) {
657 struct proc_dir_entry
*entry
;
658 entry
= create_proc_entry("fs/nfs/exports", 0, NULL
);
660 entry
->proc_fops
= &exports_operations
;
662 retval
= register_filesystem(&nfsd_fs_type
);
664 nfsd_export_shutdown();
665 nfsd_cache_shutdown();
666 remove_proc_entry("fs/nfs/exports", NULL
);
667 remove_proc_entry("fs/nfs", NULL
);
668 nfsd_stat_shutdown();
669 nfsd_lockd_shutdown();
674 static void __exit
exit_nfsd(void)
676 nfsd_export_shutdown();
677 nfsd_cache_shutdown();
678 remove_proc_entry("fs/nfs/exports", NULL
);
679 remove_proc_entry("fs/nfs", NULL
);
680 nfsd_stat_shutdown();
681 nfsd_lockd_shutdown();
682 nfsd_idmap_shutdown();
683 unregister_filesystem(&nfsd_fs_type
);
686 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
687 MODULE_LICENSE("GPL");
688 module_init(init_nfsd
)
689 module_exit(exit_nfsd
)