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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * net/sunrpc/rpc_pipe.c | |
3 | * | |
4 | * Userland/kernel interface for rpcauth_gss. | |
5 | * Code shamelessly plagiarized from fs/nfsd/nfsctl.c | |
6 | * and fs/driverfs/inode.c | |
7 | * | |
8 | * Copyright (c) 2002, Trond Myklebust <trond.myklebust@fys.uio.no> | |
9 | * | |
10 | */ | |
11 | #include <linux/config.h> | |
12 | #include <linux/module.h> | |
13 | #include <linux/slab.h> | |
14 | #include <linux/string.h> | |
15 | #include <linux/pagemap.h> | |
16 | #include <linux/mount.h> | |
17 | #include <linux/namei.h> | |
18 | #include <linux/dnotify.h> | |
19 | #include <linux/kernel.h> | |
20 | ||
21 | #include <asm/ioctls.h> | |
22 | #include <linux/fs.h> | |
23 | #include <linux/poll.h> | |
24 | #include <linux/wait.h> | |
25 | #include <linux/seq_file.h> | |
26 | ||
27 | #include <linux/sunrpc/clnt.h> | |
28 | #include <linux/workqueue.h> | |
29 | #include <linux/sunrpc/rpc_pipe_fs.h> | |
30 | ||
31 | static struct vfsmount *rpc_mount; | |
32 | static int rpc_mount_count; | |
33 | ||
34 | static struct file_system_type rpc_pipe_fs_type; | |
35 | ||
36 | ||
37 | static kmem_cache_t *rpc_inode_cachep; | |
38 | ||
39 | #define RPC_UPCALL_TIMEOUT (30*HZ) | |
40 | ||
41 | static void | |
42 | __rpc_purge_upcall(struct inode *inode, int err) | |
43 | { | |
44 | struct rpc_inode *rpci = RPC_I(inode); | |
45 | struct rpc_pipe_msg *msg; | |
46 | ||
47 | while (!list_empty(&rpci->pipe)) { | |
48 | msg = list_entry(rpci->pipe.next, struct rpc_pipe_msg, list); | |
49 | list_del_init(&msg->list); | |
50 | msg->errno = err; | |
51 | rpci->ops->destroy_msg(msg); | |
52 | } | |
53 | while (!list_empty(&rpci->in_upcall)) { | |
54 | msg = list_entry(rpci->pipe.next, struct rpc_pipe_msg, list); | |
55 | list_del_init(&msg->list); | |
56 | msg->errno = err; | |
57 | rpci->ops->destroy_msg(msg); | |
58 | } | |
59 | rpci->pipelen = 0; | |
60 | wake_up(&rpci->waitq); | |
61 | } | |
62 | ||
63 | static void | |
64 | rpc_timeout_upcall_queue(void *data) | |
65 | { | |
66 | struct rpc_inode *rpci = (struct rpc_inode *)data; | |
67 | struct inode *inode = &rpci->vfs_inode; | |
68 | ||
69 | down(&inode->i_sem); | |
70 | if (rpci->nreaders == 0 && !list_empty(&rpci->pipe)) | |
71 | __rpc_purge_upcall(inode, -ETIMEDOUT); | |
72 | up(&inode->i_sem); | |
73 | } | |
74 | ||
75 | int | |
76 | rpc_queue_upcall(struct inode *inode, struct rpc_pipe_msg *msg) | |
77 | { | |
78 | struct rpc_inode *rpci = RPC_I(inode); | |
79 | int res = 0; | |
80 | ||
81 | down(&inode->i_sem); | |
82 | if (rpci->nreaders) { | |
83 | list_add_tail(&msg->list, &rpci->pipe); | |
84 | rpci->pipelen += msg->len; | |
85 | } else if (rpci->flags & RPC_PIPE_WAIT_FOR_OPEN) { | |
86 | if (list_empty(&rpci->pipe)) | |
87 | schedule_delayed_work(&rpci->queue_timeout, | |
88 | RPC_UPCALL_TIMEOUT); | |
89 | list_add_tail(&msg->list, &rpci->pipe); | |
90 | rpci->pipelen += msg->len; | |
91 | } else | |
92 | res = -EPIPE; | |
93 | up(&inode->i_sem); | |
94 | wake_up(&rpci->waitq); | |
95 | return res; | |
96 | } | |
97 | ||
98 | static void | |
99 | rpc_close_pipes(struct inode *inode) | |
100 | { | |
101 | struct rpc_inode *rpci = RPC_I(inode); | |
102 | ||
103 | cancel_delayed_work(&rpci->queue_timeout); | |
104 | flush_scheduled_work(); | |
105 | down(&inode->i_sem); | |
106 | if (rpci->ops != NULL) { | |
107 | rpci->nreaders = 0; | |
108 | __rpc_purge_upcall(inode, -EPIPE); | |
109 | rpci->nwriters = 0; | |
110 | if (rpci->ops->release_pipe) | |
111 | rpci->ops->release_pipe(inode); | |
112 | rpci->ops = NULL; | |
113 | } | |
114 | up(&inode->i_sem); | |
115 | } | |
116 | ||
117 | static inline void | |
118 | rpc_inode_setowner(struct inode *inode, void *private) | |
119 | { | |
120 | RPC_I(inode)->private = private; | |
121 | } | |
122 | ||
123 | static struct inode * | |
124 | rpc_alloc_inode(struct super_block *sb) | |
125 | { | |
126 | struct rpc_inode *rpci; | |
127 | rpci = (struct rpc_inode *)kmem_cache_alloc(rpc_inode_cachep, SLAB_KERNEL); | |
128 | if (!rpci) | |
129 | return NULL; | |
130 | return &rpci->vfs_inode; | |
131 | } | |
132 | ||
133 | static void | |
134 | rpc_destroy_inode(struct inode *inode) | |
135 | { | |
136 | kmem_cache_free(rpc_inode_cachep, RPC_I(inode)); | |
137 | } | |
138 | ||
139 | static int | |
140 | rpc_pipe_open(struct inode *inode, struct file *filp) | |
141 | { | |
142 | struct rpc_inode *rpci = RPC_I(inode); | |
143 | int res = -ENXIO; | |
144 | ||
145 | down(&inode->i_sem); | |
146 | if (rpci->ops != NULL) { | |
147 | if (filp->f_mode & FMODE_READ) | |
148 | rpci->nreaders ++; | |
149 | if (filp->f_mode & FMODE_WRITE) | |
150 | rpci->nwriters ++; | |
151 | res = 0; | |
152 | } | |
153 | up(&inode->i_sem); | |
154 | return res; | |
155 | } | |
156 | ||
157 | static int | |
158 | rpc_pipe_release(struct inode *inode, struct file *filp) | |
159 | { | |
160 | struct rpc_inode *rpci = RPC_I(filp->f_dentry->d_inode); | |
161 | struct rpc_pipe_msg *msg; | |
162 | ||
163 | down(&inode->i_sem); | |
164 | if (rpci->ops == NULL) | |
165 | goto out; | |
166 | msg = (struct rpc_pipe_msg *)filp->private_data; | |
167 | if (msg != NULL) { | |
168 | msg->errno = -EPIPE; | |
169 | list_del_init(&msg->list); | |
170 | rpci->ops->destroy_msg(msg); | |
171 | } | |
172 | if (filp->f_mode & FMODE_WRITE) | |
173 | rpci->nwriters --; | |
174 | if (filp->f_mode & FMODE_READ) | |
175 | rpci->nreaders --; | |
176 | if (!rpci->nreaders) | |
177 | __rpc_purge_upcall(inode, -EPIPE); | |
178 | if (rpci->ops->release_pipe) | |
179 | rpci->ops->release_pipe(inode); | |
180 | out: | |
181 | up(&inode->i_sem); | |
182 | return 0; | |
183 | } | |
184 | ||
185 | static ssize_t | |
186 | rpc_pipe_read(struct file *filp, char __user *buf, size_t len, loff_t *offset) | |
187 | { | |
188 | struct inode *inode = filp->f_dentry->d_inode; | |
189 | struct rpc_inode *rpci = RPC_I(inode); | |
190 | struct rpc_pipe_msg *msg; | |
191 | int res = 0; | |
192 | ||
193 | down(&inode->i_sem); | |
194 | if (rpci->ops == NULL) { | |
195 | res = -EPIPE; | |
196 | goto out_unlock; | |
197 | } | |
198 | msg = filp->private_data; | |
199 | if (msg == NULL) { | |
200 | if (!list_empty(&rpci->pipe)) { | |
201 | msg = list_entry(rpci->pipe.next, | |
202 | struct rpc_pipe_msg, | |
203 | list); | |
204 | list_move(&msg->list, &rpci->in_upcall); | |
205 | rpci->pipelen -= msg->len; | |
206 | filp->private_data = msg; | |
207 | msg->copied = 0; | |
208 | } | |
209 | if (msg == NULL) | |
210 | goto out_unlock; | |
211 | } | |
212 | /* NOTE: it is up to the callback to update msg->copied */ | |
213 | res = rpci->ops->upcall(filp, msg, buf, len); | |
214 | if (res < 0 || msg->len == msg->copied) { | |
215 | filp->private_data = NULL; | |
216 | list_del_init(&msg->list); | |
217 | rpci->ops->destroy_msg(msg); | |
218 | } | |
219 | out_unlock: | |
220 | up(&inode->i_sem); | |
221 | return res; | |
222 | } | |
223 | ||
224 | static ssize_t | |
225 | rpc_pipe_write(struct file *filp, const char __user *buf, size_t len, loff_t *offset) | |
226 | { | |
227 | struct inode *inode = filp->f_dentry->d_inode; | |
228 | struct rpc_inode *rpci = RPC_I(inode); | |
229 | int res; | |
230 | ||
231 | down(&inode->i_sem); | |
232 | res = -EPIPE; | |
233 | if (rpci->ops != NULL) | |
234 | res = rpci->ops->downcall(filp, buf, len); | |
235 | up(&inode->i_sem); | |
236 | return res; | |
237 | } | |
238 | ||
239 | static unsigned int | |
240 | rpc_pipe_poll(struct file *filp, struct poll_table_struct *wait) | |
241 | { | |
242 | struct rpc_inode *rpci; | |
243 | unsigned int mask = 0; | |
244 | ||
245 | rpci = RPC_I(filp->f_dentry->d_inode); | |
246 | poll_wait(filp, &rpci->waitq, wait); | |
247 | ||
248 | mask = POLLOUT | POLLWRNORM; | |
249 | if (rpci->ops == NULL) | |
250 | mask |= POLLERR | POLLHUP; | |
251 | if (!list_empty(&rpci->pipe)) | |
252 | mask |= POLLIN | POLLRDNORM; | |
253 | return mask; | |
254 | } | |
255 | ||
256 | static int | |
257 | rpc_pipe_ioctl(struct inode *ino, struct file *filp, | |
258 | unsigned int cmd, unsigned long arg) | |
259 | { | |
260 | struct rpc_inode *rpci = RPC_I(filp->f_dentry->d_inode); | |
261 | int len; | |
262 | ||
263 | switch (cmd) { | |
264 | case FIONREAD: | |
265 | if (rpci->ops == NULL) | |
266 | return -EPIPE; | |
267 | len = rpci->pipelen; | |
268 | if (filp->private_data) { | |
269 | struct rpc_pipe_msg *msg; | |
270 | msg = (struct rpc_pipe_msg *)filp->private_data; | |
271 | len += msg->len - msg->copied; | |
272 | } | |
273 | return put_user(len, (int __user *)arg); | |
274 | default: | |
275 | return -EINVAL; | |
276 | } | |
277 | } | |
278 | ||
279 | static struct file_operations rpc_pipe_fops = { | |
280 | .owner = THIS_MODULE, | |
281 | .llseek = no_llseek, | |
282 | .read = rpc_pipe_read, | |
283 | .write = rpc_pipe_write, | |
284 | .poll = rpc_pipe_poll, | |
285 | .ioctl = rpc_pipe_ioctl, | |
286 | .open = rpc_pipe_open, | |
287 | .release = rpc_pipe_release, | |
288 | }; | |
289 | ||
290 | static int | |
291 | rpc_show_info(struct seq_file *m, void *v) | |
292 | { | |
293 | struct rpc_clnt *clnt = m->private; | |
294 | ||
295 | seq_printf(m, "RPC server: %s\n", clnt->cl_server); | |
296 | seq_printf(m, "service: %s (%d) version %d\n", clnt->cl_protname, | |
297 | clnt->cl_prog, clnt->cl_vers); | |
298 | seq_printf(m, "address: %u.%u.%u.%u\n", | |
299 | NIPQUAD(clnt->cl_xprt->addr.sin_addr.s_addr)); | |
300 | seq_printf(m, "protocol: %s\n", | |
301 | clnt->cl_xprt->prot == IPPROTO_UDP ? "udp" : "tcp"); | |
302 | return 0; | |
303 | } | |
304 | ||
305 | static int | |
306 | rpc_info_open(struct inode *inode, struct file *file) | |
307 | { | |
308 | struct rpc_clnt *clnt; | |
309 | int ret = single_open(file, rpc_show_info, NULL); | |
310 | ||
311 | if (!ret) { | |
312 | struct seq_file *m = file->private_data; | |
313 | down(&inode->i_sem); | |
314 | clnt = RPC_I(inode)->private; | |
315 | if (clnt) { | |
316 | atomic_inc(&clnt->cl_users); | |
317 | m->private = clnt; | |
318 | } else { | |
319 | single_release(inode, file); | |
320 | ret = -EINVAL; | |
321 | } | |
322 | up(&inode->i_sem); | |
323 | } | |
324 | return ret; | |
325 | } | |
326 | ||
327 | static int | |
328 | rpc_info_release(struct inode *inode, struct file *file) | |
329 | { | |
330 | struct seq_file *m = file->private_data; | |
331 | struct rpc_clnt *clnt = (struct rpc_clnt *)m->private; | |
332 | ||
333 | if (clnt) | |
334 | rpc_release_client(clnt); | |
335 | return single_release(inode, file); | |
336 | } | |
337 | ||
338 | static struct file_operations rpc_info_operations = { | |
339 | .owner = THIS_MODULE, | |
340 | .open = rpc_info_open, | |
341 | .read = seq_read, | |
342 | .llseek = seq_lseek, | |
343 | .release = rpc_info_release, | |
344 | }; | |
345 | ||
346 | ||
347 | /* | |
348 | * We have a single directory with 1 node in it. | |
349 | */ | |
350 | enum { | |
351 | RPCAUTH_Root = 1, | |
352 | RPCAUTH_lockd, | |
353 | RPCAUTH_mount, | |
354 | RPCAUTH_nfs, | |
355 | RPCAUTH_portmap, | |
356 | RPCAUTH_statd, | |
357 | RPCAUTH_RootEOF | |
358 | }; | |
359 | ||
360 | /* | |
361 | * Description of fs contents. | |
362 | */ | |
363 | struct rpc_filelist { | |
364 | char *name; | |
365 | struct file_operations *i_fop; | |
366 | int mode; | |
367 | }; | |
368 | ||
369 | static struct rpc_filelist files[] = { | |
370 | [RPCAUTH_lockd] = { | |
371 | .name = "lockd", | |
372 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
373 | }, | |
374 | [RPCAUTH_mount] = { | |
375 | .name = "mount", | |
376 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
377 | }, | |
378 | [RPCAUTH_nfs] = { | |
379 | .name = "nfs", | |
380 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
381 | }, | |
382 | [RPCAUTH_portmap] = { | |
383 | .name = "portmap", | |
384 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
385 | }, | |
386 | [RPCAUTH_statd] = { | |
387 | .name = "statd", | |
388 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
389 | }, | |
390 | }; | |
391 | ||
392 | enum { | |
393 | RPCAUTH_info = 2, | |
394 | RPCAUTH_EOF | |
395 | }; | |
396 | ||
397 | static struct rpc_filelist authfiles[] = { | |
398 | [RPCAUTH_info] = { | |
399 | .name = "info", | |
400 | .i_fop = &rpc_info_operations, | |
401 | .mode = S_IFREG | S_IRUSR, | |
402 | }, | |
403 | }; | |
404 | ||
405 | static int | |
406 | rpc_get_mount(void) | |
407 | { | |
408 | return simple_pin_fs("rpc_pipefs", &rpc_mount, &rpc_mount_count); | |
409 | } | |
410 | ||
411 | static void | |
412 | rpc_put_mount(void) | |
413 | { | |
414 | simple_release_fs(&rpc_mount, &rpc_mount_count); | |
415 | } | |
416 | ||
417 | static int | |
418 | rpc_lookup_parent(char *path, struct nameidata *nd) | |
419 | { | |
420 | if (path[0] == '\0') | |
421 | return -ENOENT; | |
422 | if (rpc_get_mount()) { | |
423 | printk(KERN_WARNING "%s: %s failed to mount " | |
424 | "pseudofilesystem \n", __FILE__, __FUNCTION__); | |
425 | return -ENODEV; | |
426 | } | |
427 | nd->mnt = mntget(rpc_mount); | |
428 | nd->dentry = dget(rpc_mount->mnt_root); | |
429 | nd->last_type = LAST_ROOT; | |
430 | nd->flags = LOOKUP_PARENT; | |
431 | nd->depth = 0; | |
432 | ||
433 | if (path_walk(path, nd)) { | |
434 | printk(KERN_WARNING "%s: %s failed to find path %s\n", | |
435 | __FILE__, __FUNCTION__, path); | |
436 | rpc_put_mount(); | |
437 | return -ENOENT; | |
438 | } | |
439 | return 0; | |
440 | } | |
441 | ||
442 | static void | |
443 | rpc_release_path(struct nameidata *nd) | |
444 | { | |
445 | path_release(nd); | |
446 | rpc_put_mount(); | |
447 | } | |
448 | ||
449 | static struct inode * | |
450 | rpc_get_inode(struct super_block *sb, int mode) | |
451 | { | |
452 | struct inode *inode = new_inode(sb); | |
453 | if (!inode) | |
454 | return NULL; | |
455 | inode->i_mode = mode; | |
456 | inode->i_uid = inode->i_gid = 0; | |
457 | inode->i_blksize = PAGE_CACHE_SIZE; | |
458 | inode->i_blocks = 0; | |
459 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
460 | switch(mode & S_IFMT) { | |
461 | case S_IFDIR: | |
462 | inode->i_fop = &simple_dir_operations; | |
463 | inode->i_op = &simple_dir_inode_operations; | |
464 | inode->i_nlink++; | |
465 | default: | |
466 | break; | |
467 | } | |
468 | return inode; | |
469 | } | |
470 | ||
471 | /* | |
472 | * FIXME: This probably has races. | |
473 | */ | |
474 | static void | |
475 | rpc_depopulate(struct dentry *parent) | |
476 | { | |
477 | struct inode *dir = parent->d_inode; | |
478 | struct list_head *pos, *next; | |
479 | struct dentry *dentry, *dvec[10]; | |
480 | int n = 0; | |
481 | ||
482 | down(&dir->i_sem); | |
483 | repeat: | |
484 | spin_lock(&dcache_lock); | |
485 | list_for_each_safe(pos, next, &parent->d_subdirs) { | |
486 | dentry = list_entry(pos, struct dentry, d_child); | |
487 | spin_lock(&dentry->d_lock); | |
488 | if (!d_unhashed(dentry)) { | |
489 | dget_locked(dentry); | |
490 | __d_drop(dentry); | |
491 | spin_unlock(&dentry->d_lock); | |
492 | dvec[n++] = dentry; | |
493 | if (n == ARRAY_SIZE(dvec)) | |
494 | break; | |
495 | } else | |
496 | spin_unlock(&dentry->d_lock); | |
497 | } | |
498 | spin_unlock(&dcache_lock); | |
499 | if (n) { | |
500 | do { | |
501 | dentry = dvec[--n]; | |
502 | if (dentry->d_inode) { | |
503 | rpc_close_pipes(dentry->d_inode); | |
504 | rpc_inode_setowner(dentry->d_inode, NULL); | |
505 | simple_unlink(dir, dentry); | |
506 | } | |
507 | dput(dentry); | |
508 | } while (n); | |
509 | goto repeat; | |
510 | } | |
511 | up(&dir->i_sem); | |
512 | } | |
513 | ||
514 | static int | |
515 | rpc_populate(struct dentry *parent, | |
516 | struct rpc_filelist *files, | |
517 | int start, int eof) | |
518 | { | |
519 | struct inode *inode, *dir = parent->d_inode; | |
520 | void *private = RPC_I(dir)->private; | |
521 | struct dentry *dentry; | |
522 | int mode, i; | |
523 | ||
524 | down(&dir->i_sem); | |
525 | for (i = start; i < eof; i++) { | |
526 | dentry = d_alloc_name(parent, files[i].name); | |
527 | if (!dentry) | |
528 | goto out_bad; | |
529 | mode = files[i].mode; | |
530 | inode = rpc_get_inode(dir->i_sb, mode); | |
531 | if (!inode) { | |
532 | dput(dentry); | |
533 | goto out_bad; | |
534 | } | |
535 | inode->i_ino = i; | |
536 | if (files[i].i_fop) | |
537 | inode->i_fop = files[i].i_fop; | |
538 | if (private) | |
539 | rpc_inode_setowner(inode, private); | |
540 | if (S_ISDIR(mode)) | |
541 | dir->i_nlink++; | |
542 | d_add(dentry, inode); | |
543 | } | |
544 | up(&dir->i_sem); | |
545 | return 0; | |
546 | out_bad: | |
547 | up(&dir->i_sem); | |
548 | printk(KERN_WARNING "%s: %s failed to populate directory %s\n", | |
549 | __FILE__, __FUNCTION__, parent->d_name.name); | |
550 | return -ENOMEM; | |
551 | } | |
552 | ||
553 | static int | |
554 | __rpc_mkdir(struct inode *dir, struct dentry *dentry) | |
555 | { | |
556 | struct inode *inode; | |
557 | ||
558 | inode = rpc_get_inode(dir->i_sb, S_IFDIR | S_IRUSR | S_IXUSR); | |
559 | if (!inode) | |
560 | goto out_err; | |
561 | inode->i_ino = iunique(dir->i_sb, 100); | |
562 | d_instantiate(dentry, inode); | |
563 | dir->i_nlink++; | |
564 | inode_dir_notify(dir, DN_CREATE); | |
565 | rpc_get_mount(); | |
566 | return 0; | |
567 | out_err: | |
568 | printk(KERN_WARNING "%s: %s failed to allocate inode for dentry %s\n", | |
569 | __FILE__, __FUNCTION__, dentry->d_name.name); | |
570 | return -ENOMEM; | |
571 | } | |
572 | ||
573 | static int | |
574 | __rpc_rmdir(struct inode *dir, struct dentry *dentry) | |
575 | { | |
576 | int error; | |
577 | ||
578 | shrink_dcache_parent(dentry); | |
579 | if (dentry->d_inode) { | |
580 | rpc_close_pipes(dentry->d_inode); | |
581 | rpc_inode_setowner(dentry->d_inode, NULL); | |
582 | } | |
583 | if ((error = simple_rmdir(dir, dentry)) != 0) | |
584 | return error; | |
585 | if (!error) { | |
586 | inode_dir_notify(dir, DN_DELETE); | |
587 | d_drop(dentry); | |
588 | rpc_put_mount(); | |
589 | } | |
590 | return 0; | |
591 | } | |
592 | ||
593 | static struct dentry * | |
594 | rpc_lookup_negative(char *path, struct nameidata *nd) | |
595 | { | |
596 | struct dentry *dentry; | |
597 | struct inode *dir; | |
598 | int error; | |
599 | ||
600 | if ((error = rpc_lookup_parent(path, nd)) != 0) | |
601 | return ERR_PTR(error); | |
602 | dir = nd->dentry->d_inode; | |
603 | down(&dir->i_sem); | |
604 | dentry = lookup_hash(&nd->last, nd->dentry); | |
605 | if (IS_ERR(dentry)) | |
606 | goto out_err; | |
607 | if (dentry->d_inode) { | |
608 | dput(dentry); | |
609 | dentry = ERR_PTR(-EEXIST); | |
610 | goto out_err; | |
611 | } | |
612 | return dentry; | |
613 | out_err: | |
614 | up(&dir->i_sem); | |
615 | rpc_release_path(nd); | |
616 | return dentry; | |
617 | } | |
618 | ||
619 | ||
620 | struct dentry * | |
621 | rpc_mkdir(char *path, struct rpc_clnt *rpc_client) | |
622 | { | |
623 | struct nameidata nd; | |
624 | struct dentry *dentry; | |
625 | struct inode *dir; | |
626 | int error; | |
627 | ||
628 | dentry = rpc_lookup_negative(path, &nd); | |
629 | if (IS_ERR(dentry)) | |
630 | return dentry; | |
631 | dir = nd.dentry->d_inode; | |
632 | if ((error = __rpc_mkdir(dir, dentry)) != 0) | |
633 | goto err_dput; | |
634 | RPC_I(dentry->d_inode)->private = rpc_client; | |
635 | error = rpc_populate(dentry, authfiles, | |
636 | RPCAUTH_info, RPCAUTH_EOF); | |
637 | if (error) | |
638 | goto err_depopulate; | |
639 | out: | |
640 | up(&dir->i_sem); | |
641 | rpc_release_path(&nd); | |
642 | return dentry; | |
643 | err_depopulate: | |
644 | rpc_depopulate(dentry); | |
645 | __rpc_rmdir(dir, dentry); | |
646 | err_dput: | |
647 | dput(dentry); | |
648 | printk(KERN_WARNING "%s: %s() failed to create directory %s (errno = %d)\n", | |
649 | __FILE__, __FUNCTION__, path, error); | |
650 | dentry = ERR_PTR(error); | |
651 | goto out; | |
652 | } | |
653 | ||
654 | int | |
655 | rpc_rmdir(char *path) | |
656 | { | |
657 | struct nameidata nd; | |
658 | struct dentry *dentry; | |
659 | struct inode *dir; | |
660 | int error; | |
661 | ||
662 | if ((error = rpc_lookup_parent(path, &nd)) != 0) | |
663 | return error; | |
664 | dir = nd.dentry->d_inode; | |
665 | down(&dir->i_sem); | |
666 | dentry = lookup_hash(&nd.last, nd.dentry); | |
667 | if (IS_ERR(dentry)) { | |
668 | error = PTR_ERR(dentry); | |
669 | goto out_release; | |
670 | } | |
671 | rpc_depopulate(dentry); | |
672 | error = __rpc_rmdir(dir, dentry); | |
673 | dput(dentry); | |
674 | out_release: | |
675 | up(&dir->i_sem); | |
676 | rpc_release_path(&nd); | |
677 | return error; | |
678 | } | |
679 | ||
680 | struct dentry * | |
681 | rpc_mkpipe(char *path, void *private, struct rpc_pipe_ops *ops, int flags) | |
682 | { | |
683 | struct nameidata nd; | |
684 | struct dentry *dentry; | |
685 | struct inode *dir, *inode; | |
686 | struct rpc_inode *rpci; | |
687 | ||
688 | dentry = rpc_lookup_negative(path, &nd); | |
689 | if (IS_ERR(dentry)) | |
690 | return dentry; | |
691 | dir = nd.dentry->d_inode; | |
692 | inode = rpc_get_inode(dir->i_sb, S_IFSOCK | S_IRUSR | S_IWUSR); | |
693 | if (!inode) | |
694 | goto err_dput; | |
695 | inode->i_ino = iunique(dir->i_sb, 100); | |
696 | inode->i_fop = &rpc_pipe_fops; | |
697 | d_instantiate(dentry, inode); | |
698 | rpci = RPC_I(inode); | |
699 | rpci->private = private; | |
700 | rpci->flags = flags; | |
701 | rpci->ops = ops; | |
702 | inode_dir_notify(dir, DN_CREATE); | |
703 | out: | |
704 | up(&dir->i_sem); | |
705 | rpc_release_path(&nd); | |
706 | return dentry; | |
707 | err_dput: | |
708 | dput(dentry); | |
709 | dentry = ERR_PTR(-ENOMEM); | |
710 | printk(KERN_WARNING "%s: %s() failed to create pipe %s (errno = %d)\n", | |
711 | __FILE__, __FUNCTION__, path, -ENOMEM); | |
712 | goto out; | |
713 | } | |
714 | ||
715 | int | |
716 | rpc_unlink(char *path) | |
717 | { | |
718 | struct nameidata nd; | |
719 | struct dentry *dentry; | |
720 | struct inode *dir; | |
721 | int error; | |
722 | ||
723 | if ((error = rpc_lookup_parent(path, &nd)) != 0) | |
724 | return error; | |
725 | dir = nd.dentry->d_inode; | |
726 | down(&dir->i_sem); | |
727 | dentry = lookup_hash(&nd.last, nd.dentry); | |
728 | if (IS_ERR(dentry)) { | |
729 | error = PTR_ERR(dentry); | |
730 | goto out_release; | |
731 | } | |
732 | d_drop(dentry); | |
733 | if (dentry->d_inode) { | |
734 | rpc_close_pipes(dentry->d_inode); | |
735 | rpc_inode_setowner(dentry->d_inode, NULL); | |
736 | error = simple_unlink(dir, dentry); | |
737 | } | |
738 | dput(dentry); | |
739 | inode_dir_notify(dir, DN_DELETE); | |
740 | out_release: | |
741 | up(&dir->i_sem); | |
742 | rpc_release_path(&nd); | |
743 | return error; | |
744 | } | |
745 | ||
746 | /* | |
747 | * populate the filesystem | |
748 | */ | |
749 | static struct super_operations s_ops = { | |
750 | .alloc_inode = rpc_alloc_inode, | |
751 | .destroy_inode = rpc_destroy_inode, | |
752 | .statfs = simple_statfs, | |
753 | }; | |
754 | ||
755 | #define RPCAUTH_GSSMAGIC 0x67596969 | |
756 | ||
757 | static int | |
758 | rpc_fill_super(struct super_block *sb, void *data, int silent) | |
759 | { | |
760 | struct inode *inode; | |
761 | struct dentry *root; | |
762 | ||
763 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
764 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
765 | sb->s_magic = RPCAUTH_GSSMAGIC; | |
766 | sb->s_op = &s_ops; | |
767 | sb->s_time_gran = 1; | |
768 | ||
769 | inode = rpc_get_inode(sb, S_IFDIR | 0755); | |
770 | if (!inode) | |
771 | return -ENOMEM; | |
772 | root = d_alloc_root(inode); | |
773 | if (!root) { | |
774 | iput(inode); | |
775 | return -ENOMEM; | |
776 | } | |
777 | if (rpc_populate(root, files, RPCAUTH_Root + 1, RPCAUTH_RootEOF)) | |
778 | goto out; | |
779 | sb->s_root = root; | |
780 | return 0; | |
781 | out: | |
782 | d_genocide(root); | |
783 | dput(root); | |
784 | return -ENOMEM; | |
785 | } | |
786 | ||
787 | static struct super_block * | |
788 | rpc_get_sb(struct file_system_type *fs_type, | |
789 | int flags, const char *dev_name, void *data) | |
790 | { | |
791 | return get_sb_single(fs_type, flags, data, rpc_fill_super); | |
792 | } | |
793 | ||
794 | static struct file_system_type rpc_pipe_fs_type = { | |
795 | .owner = THIS_MODULE, | |
796 | .name = "rpc_pipefs", | |
797 | .get_sb = rpc_get_sb, | |
798 | .kill_sb = kill_litter_super, | |
799 | }; | |
800 | ||
801 | static void | |
802 | init_once(void * foo, kmem_cache_t * cachep, unsigned long flags) | |
803 | { | |
804 | struct rpc_inode *rpci = (struct rpc_inode *) foo; | |
805 | ||
806 | if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == | |
807 | SLAB_CTOR_CONSTRUCTOR) { | |
808 | inode_init_once(&rpci->vfs_inode); | |
809 | rpci->private = NULL; | |
810 | rpci->nreaders = 0; | |
811 | rpci->nwriters = 0; | |
812 | INIT_LIST_HEAD(&rpci->in_upcall); | |
813 | INIT_LIST_HEAD(&rpci->pipe); | |
814 | rpci->pipelen = 0; | |
815 | init_waitqueue_head(&rpci->waitq); | |
816 | INIT_WORK(&rpci->queue_timeout, rpc_timeout_upcall_queue, rpci); | |
817 | rpci->ops = NULL; | |
818 | } | |
819 | } | |
820 | ||
821 | int register_rpc_pipefs(void) | |
822 | { | |
823 | rpc_inode_cachep = kmem_cache_create("rpc_inode_cache", | |
824 | sizeof(struct rpc_inode), | |
825 | 0, SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT, | |
826 | init_once, NULL); | |
827 | if (!rpc_inode_cachep) | |
828 | return -ENOMEM; | |
829 | register_filesystem(&rpc_pipe_fs_type); | |
830 | return 0; | |
831 | } | |
832 | ||
833 | void unregister_rpc_pipefs(void) | |
834 | { | |
835 | if (kmem_cache_destroy(rpc_inode_cachep)) | |
836 | printk(KERN_WARNING "RPC: unable to free inode cache\n"); | |
837 | unregister_filesystem(&rpc_pipe_fs_type); | |
838 | } |