Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/fs/nfsd/nfsctl.c | |
3 | * | |
4 | * Syscall interface to knfsd. | |
5 | * | |
6 | * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> | |
7 | */ | |
8 | ||
9 | #include <linux/config.h> | |
10 | #include <linux/module.h> | |
11 | ||
12 | #include <linux/linkage.h> | |
13 | #include <linux/time.h> | |
14 | #include <linux/errno.h> | |
15 | #include <linux/fs.h> | |
16 | #include <linux/fcntl.h> | |
17 | #include <linux/net.h> | |
18 | #include <linux/in.h> | |
19 | #include <linux/syscalls.h> | |
20 | #include <linux/unistd.h> | |
21 | #include <linux/slab.h> | |
22 | #include <linux/proc_fs.h> | |
23 | #include <linux/seq_file.h> | |
24 | #include <linux/pagemap.h> | |
25 | #include <linux/init.h> | |
26 | ||
27 | #include <linux/nfs.h> | |
28 | #include <linux/nfsd_idmap.h> | |
29 | #include <linux/sunrpc/svc.h> | |
30 | #include <linux/nfsd/nfsd.h> | |
31 | #include <linux/nfsd/cache.h> | |
32 | #include <linux/nfsd/xdr.h> | |
33 | #include <linux/nfsd/syscall.h> | |
34 | #include <linux/nfsd/interface.h> | |
35 | ||
36 | #include <asm/uaccess.h> | |
37 | ||
38 | /* | |
39 | * We have a single directory with 9 nodes in it. | |
40 | */ | |
41 | enum { | |
42 | NFSD_Root = 1, | |
43 | NFSD_Svc, | |
44 | NFSD_Add, | |
45 | NFSD_Del, | |
46 | NFSD_Export, | |
47 | NFSD_Unexport, | |
48 | NFSD_Getfd, | |
49 | NFSD_Getfs, | |
50 | NFSD_List, | |
51 | NFSD_Fh, | |
52 | NFSD_Threads, | |
53 | NFSD_Leasetime, | |
0964a3d3 | 54 | NFSD_RecoveryDir, |
1da177e4 LT |
55 | }; |
56 | ||
57 | /* | |
58 | * write() for these nodes. | |
59 | */ | |
60 | static ssize_t write_svc(struct file *file, char *buf, size_t size); | |
61 | static ssize_t write_add(struct file *file, char *buf, size_t size); | |
62 | static ssize_t write_del(struct file *file, char *buf, size_t size); | |
63 | static ssize_t write_export(struct file *file, char *buf, size_t size); | |
64 | static ssize_t write_unexport(struct file *file, char *buf, size_t size); | |
65 | static ssize_t write_getfd(struct file *file, char *buf, size_t size); | |
66 | static ssize_t write_getfs(struct file *file, char *buf, size_t size); | |
67 | static ssize_t write_filehandle(struct file *file, char *buf, size_t size); | |
68 | static ssize_t write_threads(struct file *file, char *buf, size_t size); | |
69 | static ssize_t write_leasetime(struct file *file, char *buf, size_t size); | |
0964a3d3 | 70 | static ssize_t write_recoverydir(struct file *file, char *buf, size_t size); |
1da177e4 LT |
71 | |
72 | static ssize_t (*write_op[])(struct file *, char *, size_t) = { | |
73 | [NFSD_Svc] = write_svc, | |
74 | [NFSD_Add] = write_add, | |
75 | [NFSD_Del] = write_del, | |
76 | [NFSD_Export] = write_export, | |
77 | [NFSD_Unexport] = write_unexport, | |
78 | [NFSD_Getfd] = write_getfd, | |
79 | [NFSD_Getfs] = write_getfs, | |
80 | [NFSD_Fh] = write_filehandle, | |
81 | [NFSD_Threads] = write_threads, | |
82 | [NFSD_Leasetime] = write_leasetime, | |
0964a3d3 | 83 | [NFSD_RecoveryDir] = write_recoverydir, |
1da177e4 LT |
84 | }; |
85 | ||
86 | static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos) | |
87 | { | |
88 | ino_t ino = file->f_dentry->d_inode->i_ino; | |
89 | char *data; | |
90 | ssize_t rv; | |
91 | ||
92 | if (ino >= sizeof(write_op)/sizeof(write_op[0]) || !write_op[ino]) | |
93 | return -EINVAL; | |
94 | ||
95 | data = simple_transaction_get(file, buf, size); | |
96 | if (IS_ERR(data)) | |
97 | return PTR_ERR(data); | |
98 | ||
99 | rv = write_op[ino](file, data, size); | |
100 | if (rv>0) { | |
101 | simple_transaction_set(file, rv); | |
102 | rv = size; | |
103 | } | |
104 | return rv; | |
105 | } | |
106 | ||
7390022d N |
107 | static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos) |
108 | { | |
109 | if (! file->private_data) { | |
110 | /* An attempt to read a transaction file without writing | |
111 | * causes a 0-byte write so that the file can return | |
112 | * state information | |
113 | */ | |
114 | ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos); | |
115 | if (rv < 0) | |
116 | return rv; | |
117 | } | |
118 | return simple_transaction_read(file, buf, size, pos); | |
119 | } | |
120 | ||
1da177e4 LT |
121 | static struct file_operations transaction_ops = { |
122 | .write = nfsctl_transaction_write, | |
7390022d | 123 | .read = nfsctl_transaction_read, |
1da177e4 LT |
124 | .release = simple_transaction_release, |
125 | }; | |
126 | ||
127 | extern struct seq_operations nfs_exports_op; | |
128 | static int exports_open(struct inode *inode, struct file *file) | |
129 | { | |
130 | return seq_open(file, &nfs_exports_op); | |
131 | } | |
132 | ||
133 | static struct file_operations exports_operations = { | |
134 | .open = exports_open, | |
135 | .read = seq_read, | |
136 | .llseek = seq_lseek, | |
137 | .release = seq_release, | |
138 | }; | |
139 | ||
140 | /*----------------------------------------------------------------------------*/ | |
141 | /* | |
142 | * payload - write methods | |
143 | * If the method has a response, the response should be put in buf, | |
144 | * and the length returned. Otherwise return 0 or and -error. | |
145 | */ | |
146 | ||
147 | static ssize_t write_svc(struct file *file, char *buf, size_t size) | |
148 | { | |
149 | struct nfsctl_svc *data; | |
150 | if (size < sizeof(*data)) | |
151 | return -EINVAL; | |
152 | data = (struct nfsctl_svc*) buf; | |
153 | return nfsd_svc(data->svc_port, data->svc_nthreads); | |
154 | } | |
155 | ||
156 | static ssize_t write_add(struct file *file, char *buf, size_t size) | |
157 | { | |
158 | struct nfsctl_client *data; | |
159 | if (size < sizeof(*data)) | |
160 | return -EINVAL; | |
161 | data = (struct nfsctl_client *)buf; | |
162 | return exp_addclient(data); | |
163 | } | |
164 | ||
165 | static ssize_t write_del(struct file *file, char *buf, size_t size) | |
166 | { | |
167 | struct nfsctl_client *data; | |
168 | if (size < sizeof(*data)) | |
169 | return -EINVAL; | |
170 | data = (struct nfsctl_client *)buf; | |
171 | return exp_delclient(data); | |
172 | } | |
173 | ||
174 | static ssize_t write_export(struct file *file, char *buf, size_t size) | |
175 | { | |
176 | struct nfsctl_export *data; | |
177 | if (size < sizeof(*data)) | |
178 | return -EINVAL; | |
179 | data = (struct nfsctl_export*)buf; | |
180 | return exp_export(data); | |
181 | } | |
182 | ||
183 | static ssize_t write_unexport(struct file *file, char *buf, size_t size) | |
184 | { | |
185 | struct nfsctl_export *data; | |
186 | ||
187 | if (size < sizeof(*data)) | |
188 | return -EINVAL; | |
189 | data = (struct nfsctl_export*)buf; | |
190 | return exp_unexport(data); | |
191 | } | |
192 | ||
193 | static ssize_t write_getfs(struct file *file, char *buf, size_t size) | |
194 | { | |
195 | struct nfsctl_fsparm *data; | |
196 | struct sockaddr_in *sin; | |
197 | struct auth_domain *clp; | |
198 | int err = 0; | |
199 | struct knfsd_fh *res; | |
200 | ||
201 | if (size < sizeof(*data)) | |
202 | return -EINVAL; | |
203 | data = (struct nfsctl_fsparm*)buf; | |
204 | err = -EPROTONOSUPPORT; | |
205 | if (data->gd_addr.sa_family != AF_INET) | |
206 | goto out; | |
207 | sin = (struct sockaddr_in *)&data->gd_addr; | |
208 | if (data->gd_maxlen > NFS3_FHSIZE) | |
209 | data->gd_maxlen = NFS3_FHSIZE; | |
210 | ||
211 | res = (struct knfsd_fh*)buf; | |
212 | ||
213 | exp_readlock(); | |
214 | if (!(clp = auth_unix_lookup(sin->sin_addr))) | |
215 | err = -EPERM; | |
216 | else { | |
217 | err = exp_rootfh(clp, data->gd_path, res, data->gd_maxlen); | |
218 | auth_domain_put(clp); | |
219 | } | |
220 | exp_readunlock(); | |
221 | if (err == 0) | |
222 | err = res->fh_size + (int)&((struct knfsd_fh*)0)->fh_base; | |
223 | out: | |
224 | return err; | |
225 | } | |
226 | ||
227 | static ssize_t write_getfd(struct file *file, char *buf, size_t size) | |
228 | { | |
229 | struct nfsctl_fdparm *data; | |
230 | struct sockaddr_in *sin; | |
231 | struct auth_domain *clp; | |
232 | int err = 0; | |
233 | struct knfsd_fh fh; | |
234 | char *res; | |
235 | ||
236 | if (size < sizeof(*data)) | |
237 | return -EINVAL; | |
238 | data = (struct nfsctl_fdparm*)buf; | |
239 | err = -EPROTONOSUPPORT; | |
240 | if (data->gd_addr.sa_family != AF_INET) | |
241 | goto out; | |
242 | err = -EINVAL; | |
243 | if (data->gd_version < 2 || data->gd_version > NFSSVC_MAXVERS) | |
244 | goto out; | |
245 | ||
246 | res = buf; | |
247 | sin = (struct sockaddr_in *)&data->gd_addr; | |
248 | exp_readlock(); | |
249 | if (!(clp = auth_unix_lookup(sin->sin_addr))) | |
250 | err = -EPERM; | |
251 | else { | |
252 | err = exp_rootfh(clp, data->gd_path, &fh, NFS_FHSIZE); | |
253 | auth_domain_put(clp); | |
254 | } | |
255 | exp_readunlock(); | |
256 | ||
257 | if (err == 0) { | |
258 | memset(res,0, NFS_FHSIZE); | |
259 | memcpy(res, &fh.fh_base, fh.fh_size); | |
260 | err = NFS_FHSIZE; | |
261 | } | |
262 | out: | |
263 | return err; | |
264 | } | |
265 | ||
266 | static ssize_t write_filehandle(struct file *file, char *buf, size_t size) | |
267 | { | |
268 | /* request is: | |
269 | * domain path maxsize | |
270 | * response is | |
271 | * filehandle | |
272 | * | |
273 | * qword quoting is used, so filehandle will be \x.... | |
274 | */ | |
275 | char *dname, *path; | |
276 | int maxsize; | |
277 | char *mesg = buf; | |
278 | int len; | |
279 | struct auth_domain *dom; | |
280 | struct knfsd_fh fh; | |
281 | ||
282 | if (buf[size-1] != '\n') | |
283 | return -EINVAL; | |
284 | buf[size-1] = 0; | |
285 | ||
286 | dname = mesg; | |
287 | len = qword_get(&mesg, dname, size); | |
288 | if (len <= 0) return -EINVAL; | |
289 | ||
290 | path = dname+len+1; | |
291 | len = qword_get(&mesg, path, size); | |
292 | if (len <= 0) return -EINVAL; | |
293 | ||
294 | len = get_int(&mesg, &maxsize); | |
295 | if (len) | |
296 | return len; | |
297 | ||
298 | if (maxsize < NFS_FHSIZE) | |
299 | return -EINVAL; | |
300 | if (maxsize > NFS3_FHSIZE) | |
301 | maxsize = NFS3_FHSIZE; | |
302 | ||
303 | if (qword_get(&mesg, mesg, size)>0) | |
304 | return -EINVAL; | |
305 | ||
306 | /* we have all the words, they are in buf.. */ | |
307 | dom = unix_domain_find(dname); | |
308 | if (!dom) | |
309 | return -ENOMEM; | |
310 | ||
311 | len = exp_rootfh(dom, path, &fh, maxsize); | |
312 | auth_domain_put(dom); | |
313 | if (len) | |
314 | return len; | |
315 | ||
316 | mesg = buf; len = SIMPLE_TRANSACTION_LIMIT; | |
317 | qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size); | |
318 | mesg[-1] = '\n'; | |
319 | return mesg - buf; | |
320 | } | |
321 | ||
322 | extern int nfsd_nrthreads(void); | |
323 | ||
324 | static ssize_t write_threads(struct file *file, char *buf, size_t size) | |
325 | { | |
326 | /* if size > 0, look for a number of threads and call nfsd_svc | |
327 | * then write out number of threads as reply | |
328 | */ | |
329 | char *mesg = buf; | |
330 | int rv; | |
331 | if (size > 0) { | |
332 | int newthreads; | |
333 | rv = get_int(&mesg, &newthreads); | |
334 | if (rv) | |
335 | return rv; | |
336 | if (newthreads <0) | |
337 | return -EINVAL; | |
338 | rv = nfsd_svc(2049, newthreads); | |
339 | if (rv) | |
340 | return rv; | |
341 | } | |
342 | sprintf(buf, "%d\n", nfsd_nrthreads()); | |
343 | return strlen(buf); | |
344 | } | |
345 | ||
346 | extern time_t nfs4_leasetime(void); | |
347 | ||
348 | static ssize_t write_leasetime(struct file *file, char *buf, size_t size) | |
349 | { | |
350 | /* if size > 10 seconds, call | |
351 | * nfs4_reset_lease() then write out the new lease (seconds) as reply | |
352 | */ | |
353 | char *mesg = buf; | |
354 | int rv; | |
355 | ||
356 | if (size > 0) { | |
357 | int lease; | |
358 | rv = get_int(&mesg, &lease); | |
359 | if (rv) | |
360 | return rv; | |
361 | if (lease < 10 || lease > 3600) | |
362 | return -EINVAL; | |
363 | nfs4_reset_lease(lease); | |
364 | } | |
365 | sprintf(buf, "%ld\n", nfs4_lease_time()); | |
366 | return strlen(buf); | |
367 | } | |
368 | ||
0964a3d3 N |
369 | static ssize_t write_recoverydir(struct file *file, char *buf, size_t size) |
370 | { | |
371 | char *mesg = buf; | |
372 | char *recdir; | |
373 | int len, status; | |
374 | ||
375 | if (size > PATH_MAX || buf[size-1] != '\n') | |
376 | return -EINVAL; | |
377 | buf[size-1] = 0; | |
378 | ||
379 | recdir = mesg; | |
380 | len = qword_get(&mesg, recdir, size); | |
381 | if (len <= 0) | |
382 | return -EINVAL; | |
383 | ||
384 | status = nfs4_reset_recoverydir(recdir); | |
385 | return strlen(buf); | |
386 | } | |
387 | ||
1da177e4 LT |
388 | /*----------------------------------------------------------------------------*/ |
389 | /* | |
390 | * populating the filesystem. | |
391 | */ | |
392 | ||
393 | static int nfsd_fill_super(struct super_block * sb, void * data, int silent) | |
394 | { | |
395 | static struct tree_descr nfsd_files[] = { | |
396 | [NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR}, | |
397 | [NFSD_Add] = {".add", &transaction_ops, S_IWUSR}, | |
398 | [NFSD_Del] = {".del", &transaction_ops, S_IWUSR}, | |
399 | [NFSD_Export] = {".export", &transaction_ops, S_IWUSR}, | |
400 | [NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR}, | |
401 | [NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR|S_IRUSR}, | |
402 | [NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR|S_IRUSR}, | |
403 | [NFSD_List] = {"exports", &exports_operations, S_IRUGO}, | |
404 | [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR}, | |
405 | [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR}, | |
406 | #ifdef CONFIG_NFSD_V4 | |
407 | [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR}, | |
0964a3d3 | 408 | [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR}, |
1da177e4 LT |
409 | #endif |
410 | /* last one */ {""} | |
411 | }; | |
412 | return simple_fill_super(sb, 0x6e667364, nfsd_files); | |
413 | } | |
414 | ||
415 | static struct super_block *nfsd_get_sb(struct file_system_type *fs_type, | |
416 | int flags, const char *dev_name, void *data) | |
417 | { | |
418 | return get_sb_single(fs_type, flags, data, nfsd_fill_super); | |
419 | } | |
420 | ||
421 | static struct file_system_type nfsd_fs_type = { | |
422 | .owner = THIS_MODULE, | |
423 | .name = "nfsd", | |
424 | .get_sb = nfsd_get_sb, | |
425 | .kill_sb = kill_litter_super, | |
426 | }; | |
427 | ||
428 | static int __init init_nfsd(void) | |
429 | { | |
430 | int retval; | |
431 | printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n"); | |
432 | ||
433 | nfsd_stat_init(); /* Statistics */ | |
434 | nfsd_cache_init(); /* RPC reply cache */ | |
435 | nfsd_export_init(); /* Exports table */ | |
436 | nfsd_lockd_init(); /* lockd->nfsd callbacks */ | |
ac4d8ff2 | 437 | nfs4_state_init(); /* NFSv4 locking state */ |
1da177e4 | 438 | nfsd_idmap_init(); /* Name to ID mapping */ |
1da177e4 LT |
439 | if (proc_mkdir("fs/nfs", NULL)) { |
440 | struct proc_dir_entry *entry; | |
441 | entry = create_proc_entry("fs/nfs/exports", 0, NULL); | |
442 | if (entry) | |
443 | entry->proc_fops = &exports_operations; | |
444 | } | |
445 | retval = register_filesystem(&nfsd_fs_type); | |
446 | if (retval) { | |
447 | nfsd_export_shutdown(); | |
448 | nfsd_cache_shutdown(); | |
449 | remove_proc_entry("fs/nfs/exports", NULL); | |
450 | remove_proc_entry("fs/nfs", NULL); | |
451 | nfsd_stat_shutdown(); | |
452 | nfsd_lockd_shutdown(); | |
453 | } | |
454 | return retval; | |
455 | } | |
456 | ||
457 | static void __exit exit_nfsd(void) | |
458 | { | |
459 | nfsd_export_shutdown(); | |
460 | nfsd_cache_shutdown(); | |
461 | remove_proc_entry("fs/nfs/exports", NULL); | |
462 | remove_proc_entry("fs/nfs", NULL); | |
463 | nfsd_stat_shutdown(); | |
464 | nfsd_lockd_shutdown(); | |
1da177e4 | 465 | nfsd_idmap_shutdown(); |
1da177e4 LT |
466 | unregister_filesystem(&nfsd_fs_type); |
467 | } | |
468 | ||
469 | MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>"); | |
470 | MODULE_LICENSE("GPL"); | |
471 | module_init(init_nfsd) | |
472 | module_exit(exit_nfsd) |