This source file includes following definitions.
- rpc_pipefs_notifier_register
- rpc_pipefs_notifier_unregister
- rpc_purge_list
- rpc_timeout_upcall_queue
- rpc_pipe_generic_upcall
- rpc_queue_upcall
- rpc_inode_setowner
- rpc_close_pipes
- rpc_alloc_inode
- rpc_free_inode
- rpc_pipe_open
- rpc_pipe_release
- rpc_pipe_read
- rpc_pipe_write
- rpc_pipe_poll
- rpc_pipe_ioctl
- rpc_show_info
- rpc_info_open
- rpc_info_release
- rpc_get_inode
- __rpc_create_common
- __rpc_create
- __rpc_mkdir
- init_pipe
- rpc_destroy_pipe_data
- rpc_mkpipe_data
- __rpc_mkpipe_dentry
- __rpc_rmdir
- __rpc_unlink
- __rpc_rmpipe
- __rpc_lookup_create_exclusive
- __rpc_depopulate
- rpc_depopulate
- rpc_populate
- rpc_mkdir_populate
- rpc_rmdir_depopulate
- rpc_mkpipe_dentry
- rpc_unlink
- rpc_init_pipe_dir_head
- rpc_init_pipe_dir_object
- rpc_add_pipe_dir_object_locked
- rpc_remove_pipe_dir_object_locked
- rpc_add_pipe_dir_object
- rpc_remove_pipe_dir_object
- rpc_find_or_alloc_pipe_dir_object
- rpc_create_pipe_dir_objects
- rpc_destroy_pipe_dir_objects
- rpc_clntdir_populate
- rpc_clntdir_depopulate
- rpc_create_client_dir
- rpc_remove_client_dir
- rpc_cachedir_populate
- rpc_cachedir_depopulate
- rpc_create_cache_dir
- rpc_remove_cache_dir
- rpc_d_lookup_sb
- rpc_pipefs_init_net
- rpc_pipefs_exit_net
- rpc_get_sb_net
- rpc_put_sb_net
- dummy_downcall
- rpc_dummy_info_show
- rpc_gssd_dummy_populate
- rpc_gssd_dummy_depopulate
- rpc_fill_super
- gssd_running
- rpc_fs_get_tree
- rpc_fs_free_fc
- rpc_init_fs_context
- rpc_kill_sb
- init_once
- register_rpc_pipefs
- unregister_rpc_pipefs
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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/fs_context.h>
18 #include <linux/namei.h>
19 #include <linux/fsnotify.h>
20 #include <linux/kernel.h>
21 #include <linux/rcupdate.h>
22 #include <linux/utsname.h>
23
24 #include <asm/ioctls.h>
25 #include <linux/poll.h>
26 #include <linux/wait.h>
27 #include <linux/seq_file.h>
28
29 #include <linux/sunrpc/clnt.h>
30 #include <linux/workqueue.h>
31 #include <linux/sunrpc/rpc_pipe_fs.h>
32 #include <linux/sunrpc/cache.h>
33 #include <linux/nsproxy.h>
34 #include <linux/notifier.h>
35
36 #include "netns.h"
37 #include "sunrpc.h"
38
39 #define RPCDBG_FACILITY RPCDBG_DEBUG
40
41 #define NET_NAME(net) ((net == &init_net) ? " (init_net)" : "")
42
43 static struct file_system_type rpc_pipe_fs_type;
44 static const struct rpc_pipe_ops gssd_dummy_pipe_ops;
45
46 static struct kmem_cache *rpc_inode_cachep __read_mostly;
47
48 #define RPC_UPCALL_TIMEOUT (30*HZ)
49
50 static BLOCKING_NOTIFIER_HEAD(rpc_pipefs_notifier_list);
51
52 int rpc_pipefs_notifier_register(struct notifier_block *nb)
53 {
54 return blocking_notifier_chain_cond_register(&rpc_pipefs_notifier_list, nb);
55 }
56 EXPORT_SYMBOL_GPL(rpc_pipefs_notifier_register);
57
58 void rpc_pipefs_notifier_unregister(struct notifier_block *nb)
59 {
60 blocking_notifier_chain_unregister(&rpc_pipefs_notifier_list, nb);
61 }
62 EXPORT_SYMBOL_GPL(rpc_pipefs_notifier_unregister);
63
64 static void rpc_purge_list(wait_queue_head_t *waitq, struct list_head *head,
65 void (*destroy_msg)(struct rpc_pipe_msg *), int err)
66 {
67 struct rpc_pipe_msg *msg;
68
69 if (list_empty(head))
70 return;
71 do {
72 msg = list_entry(head->next, struct rpc_pipe_msg, list);
73 list_del_init(&msg->list);
74 msg->errno = err;
75 destroy_msg(msg);
76 } while (!list_empty(head));
77
78 if (waitq)
79 wake_up(waitq);
80 }
81
82 static void
83 rpc_timeout_upcall_queue(struct work_struct *work)
84 {
85 LIST_HEAD(free_list);
86 struct rpc_pipe *pipe =
87 container_of(work, struct rpc_pipe, queue_timeout.work);
88 void (*destroy_msg)(struct rpc_pipe_msg *);
89 struct dentry *dentry;
90
91 spin_lock(&pipe->lock);
92 destroy_msg = pipe->ops->destroy_msg;
93 if (pipe->nreaders == 0) {
94 list_splice_init(&pipe->pipe, &free_list);
95 pipe->pipelen = 0;
96 }
97 dentry = dget(pipe->dentry);
98 spin_unlock(&pipe->lock);
99 rpc_purge_list(dentry ? &RPC_I(d_inode(dentry))->waitq : NULL,
100 &free_list, destroy_msg, -ETIMEDOUT);
101 dput(dentry);
102 }
103
104 ssize_t rpc_pipe_generic_upcall(struct file *filp, struct rpc_pipe_msg *msg,
105 char __user *dst, size_t buflen)
106 {
107 char *data = (char *)msg->data + msg->copied;
108 size_t mlen = min(msg->len - msg->copied, buflen);
109 unsigned long left;
110
111 left = copy_to_user(dst, data, mlen);
112 if (left == mlen) {
113 msg->errno = -EFAULT;
114 return -EFAULT;
115 }
116
117 mlen -= left;
118 msg->copied += mlen;
119 msg->errno = 0;
120 return mlen;
121 }
122 EXPORT_SYMBOL_GPL(rpc_pipe_generic_upcall);
123
124
125
126
127
128
129
130
131
132
133
134 int
135 rpc_queue_upcall(struct rpc_pipe *pipe, struct rpc_pipe_msg *msg)
136 {
137 int res = -EPIPE;
138 struct dentry *dentry;
139
140 spin_lock(&pipe->lock);
141 if (pipe->nreaders) {
142 list_add_tail(&msg->list, &pipe->pipe);
143 pipe->pipelen += msg->len;
144 res = 0;
145 } else if (pipe->flags & RPC_PIPE_WAIT_FOR_OPEN) {
146 if (list_empty(&pipe->pipe))
147 queue_delayed_work(rpciod_workqueue,
148 &pipe->queue_timeout,
149 RPC_UPCALL_TIMEOUT);
150 list_add_tail(&msg->list, &pipe->pipe);
151 pipe->pipelen += msg->len;
152 res = 0;
153 }
154 dentry = dget(pipe->dentry);
155 spin_unlock(&pipe->lock);
156 if (dentry) {
157 wake_up(&RPC_I(d_inode(dentry))->waitq);
158 dput(dentry);
159 }
160 return res;
161 }
162 EXPORT_SYMBOL_GPL(rpc_queue_upcall);
163
164 static inline void
165 rpc_inode_setowner(struct inode *inode, void *private)
166 {
167 RPC_I(inode)->private = private;
168 }
169
170 static void
171 rpc_close_pipes(struct inode *inode)
172 {
173 struct rpc_pipe *pipe = RPC_I(inode)->pipe;
174 int need_release;
175 LIST_HEAD(free_list);
176
177 inode_lock(inode);
178 spin_lock(&pipe->lock);
179 need_release = pipe->nreaders != 0 || pipe->nwriters != 0;
180 pipe->nreaders = 0;
181 list_splice_init(&pipe->in_upcall, &free_list);
182 list_splice_init(&pipe->pipe, &free_list);
183 pipe->pipelen = 0;
184 pipe->dentry = NULL;
185 spin_unlock(&pipe->lock);
186 rpc_purge_list(&RPC_I(inode)->waitq, &free_list, pipe->ops->destroy_msg, -EPIPE);
187 pipe->nwriters = 0;
188 if (need_release && pipe->ops->release_pipe)
189 pipe->ops->release_pipe(inode);
190 cancel_delayed_work_sync(&pipe->queue_timeout);
191 rpc_inode_setowner(inode, NULL);
192 RPC_I(inode)->pipe = NULL;
193 inode_unlock(inode);
194 }
195
196 static struct inode *
197 rpc_alloc_inode(struct super_block *sb)
198 {
199 struct rpc_inode *rpci;
200 rpci = kmem_cache_alloc(rpc_inode_cachep, GFP_KERNEL);
201 if (!rpci)
202 return NULL;
203 return &rpci->vfs_inode;
204 }
205
206 static void
207 rpc_free_inode(struct inode *inode)
208 {
209 kmem_cache_free(rpc_inode_cachep, RPC_I(inode));
210 }
211
212 static int
213 rpc_pipe_open(struct inode *inode, struct file *filp)
214 {
215 struct rpc_pipe *pipe;
216 int first_open;
217 int res = -ENXIO;
218
219 inode_lock(inode);
220 pipe = RPC_I(inode)->pipe;
221 if (pipe == NULL)
222 goto out;
223 first_open = pipe->nreaders == 0 && pipe->nwriters == 0;
224 if (first_open && pipe->ops->open_pipe) {
225 res = pipe->ops->open_pipe(inode);
226 if (res)
227 goto out;
228 }
229 if (filp->f_mode & FMODE_READ)
230 pipe->nreaders++;
231 if (filp->f_mode & FMODE_WRITE)
232 pipe->nwriters++;
233 res = 0;
234 out:
235 inode_unlock(inode);
236 return res;
237 }
238
239 static int
240 rpc_pipe_release(struct inode *inode, struct file *filp)
241 {
242 struct rpc_pipe *pipe;
243 struct rpc_pipe_msg *msg;
244 int last_close;
245
246 inode_lock(inode);
247 pipe = RPC_I(inode)->pipe;
248 if (pipe == NULL)
249 goto out;
250 msg = filp->private_data;
251 if (msg != NULL) {
252 spin_lock(&pipe->lock);
253 msg->errno = -EAGAIN;
254 list_del_init(&msg->list);
255 spin_unlock(&pipe->lock);
256 pipe->ops->destroy_msg(msg);
257 }
258 if (filp->f_mode & FMODE_WRITE)
259 pipe->nwriters --;
260 if (filp->f_mode & FMODE_READ) {
261 pipe->nreaders --;
262 if (pipe->nreaders == 0) {
263 LIST_HEAD(free_list);
264 spin_lock(&pipe->lock);
265 list_splice_init(&pipe->pipe, &free_list);
266 pipe->pipelen = 0;
267 spin_unlock(&pipe->lock);
268 rpc_purge_list(&RPC_I(inode)->waitq, &free_list,
269 pipe->ops->destroy_msg, -EAGAIN);
270 }
271 }
272 last_close = pipe->nwriters == 0 && pipe->nreaders == 0;
273 if (last_close && pipe->ops->release_pipe)
274 pipe->ops->release_pipe(inode);
275 out:
276 inode_unlock(inode);
277 return 0;
278 }
279
280 static ssize_t
281 rpc_pipe_read(struct file *filp, char __user *buf, size_t len, loff_t *offset)
282 {
283 struct inode *inode = file_inode(filp);
284 struct rpc_pipe *pipe;
285 struct rpc_pipe_msg *msg;
286 int res = 0;
287
288 inode_lock(inode);
289 pipe = RPC_I(inode)->pipe;
290 if (pipe == NULL) {
291 res = -EPIPE;
292 goto out_unlock;
293 }
294 msg = filp->private_data;
295 if (msg == NULL) {
296 spin_lock(&pipe->lock);
297 if (!list_empty(&pipe->pipe)) {
298 msg = list_entry(pipe->pipe.next,
299 struct rpc_pipe_msg,
300 list);
301 list_move(&msg->list, &pipe->in_upcall);
302 pipe->pipelen -= msg->len;
303 filp->private_data = msg;
304 msg->copied = 0;
305 }
306 spin_unlock(&pipe->lock);
307 if (msg == NULL)
308 goto out_unlock;
309 }
310
311 res = pipe->ops->upcall(filp, msg, buf, len);
312 if (res < 0 || msg->len == msg->copied) {
313 filp->private_data = NULL;
314 spin_lock(&pipe->lock);
315 list_del_init(&msg->list);
316 spin_unlock(&pipe->lock);
317 pipe->ops->destroy_msg(msg);
318 }
319 out_unlock:
320 inode_unlock(inode);
321 return res;
322 }
323
324 static ssize_t
325 rpc_pipe_write(struct file *filp, const char __user *buf, size_t len, loff_t *offset)
326 {
327 struct inode *inode = file_inode(filp);
328 int res;
329
330 inode_lock(inode);
331 res = -EPIPE;
332 if (RPC_I(inode)->pipe != NULL)
333 res = RPC_I(inode)->pipe->ops->downcall(filp, buf, len);
334 inode_unlock(inode);
335 return res;
336 }
337
338 static __poll_t
339 rpc_pipe_poll(struct file *filp, struct poll_table_struct *wait)
340 {
341 struct inode *inode = file_inode(filp);
342 struct rpc_inode *rpci = RPC_I(inode);
343 __poll_t mask = EPOLLOUT | EPOLLWRNORM;
344
345 poll_wait(filp, &rpci->waitq, wait);
346
347 inode_lock(inode);
348 if (rpci->pipe == NULL)
349 mask |= EPOLLERR | EPOLLHUP;
350 else if (filp->private_data || !list_empty(&rpci->pipe->pipe))
351 mask |= EPOLLIN | EPOLLRDNORM;
352 inode_unlock(inode);
353 return mask;
354 }
355
356 static long
357 rpc_pipe_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
358 {
359 struct inode *inode = file_inode(filp);
360 struct rpc_pipe *pipe;
361 int len;
362
363 switch (cmd) {
364 case FIONREAD:
365 inode_lock(inode);
366 pipe = RPC_I(inode)->pipe;
367 if (pipe == NULL) {
368 inode_unlock(inode);
369 return -EPIPE;
370 }
371 spin_lock(&pipe->lock);
372 len = pipe->pipelen;
373 if (filp->private_data) {
374 struct rpc_pipe_msg *msg;
375 msg = filp->private_data;
376 len += msg->len - msg->copied;
377 }
378 spin_unlock(&pipe->lock);
379 inode_unlock(inode);
380 return put_user(len, (int __user *)arg);
381 default:
382 return -EINVAL;
383 }
384 }
385
386 static const struct file_operations rpc_pipe_fops = {
387 .owner = THIS_MODULE,
388 .llseek = no_llseek,
389 .read = rpc_pipe_read,
390 .write = rpc_pipe_write,
391 .poll = rpc_pipe_poll,
392 .unlocked_ioctl = rpc_pipe_ioctl,
393 .open = rpc_pipe_open,
394 .release = rpc_pipe_release,
395 };
396
397 static int
398 rpc_show_info(struct seq_file *m, void *v)
399 {
400 struct rpc_clnt *clnt = m->private;
401
402 rcu_read_lock();
403 seq_printf(m, "RPC server: %s\n",
404 rcu_dereference(clnt->cl_xprt)->servername);
405 seq_printf(m, "service: %s (%d) version %d\n", clnt->cl_program->name,
406 clnt->cl_prog, clnt->cl_vers);
407 seq_printf(m, "address: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_ADDR));
408 seq_printf(m, "protocol: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PROTO));
409 seq_printf(m, "port: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PORT));
410 rcu_read_unlock();
411 return 0;
412 }
413
414 static int
415 rpc_info_open(struct inode *inode, struct file *file)
416 {
417 struct rpc_clnt *clnt = NULL;
418 int ret = single_open(file, rpc_show_info, NULL);
419
420 if (!ret) {
421 struct seq_file *m = file->private_data;
422
423 spin_lock(&file->f_path.dentry->d_lock);
424 if (!d_unhashed(file->f_path.dentry))
425 clnt = RPC_I(inode)->private;
426 if (clnt != NULL && atomic_inc_not_zero(&clnt->cl_count)) {
427 spin_unlock(&file->f_path.dentry->d_lock);
428 m->private = clnt;
429 } else {
430 spin_unlock(&file->f_path.dentry->d_lock);
431 single_release(inode, file);
432 ret = -EINVAL;
433 }
434 }
435 return ret;
436 }
437
438 static int
439 rpc_info_release(struct inode *inode, struct file *file)
440 {
441 struct seq_file *m = file->private_data;
442 struct rpc_clnt *clnt = (struct rpc_clnt *)m->private;
443
444 if (clnt)
445 rpc_release_client(clnt);
446 return single_release(inode, file);
447 }
448
449 static const struct file_operations rpc_info_operations = {
450 .owner = THIS_MODULE,
451 .open = rpc_info_open,
452 .read = seq_read,
453 .llseek = seq_lseek,
454 .release = rpc_info_release,
455 };
456
457
458
459
460
461 struct rpc_filelist {
462 const char *name;
463 const struct file_operations *i_fop;
464 umode_t mode;
465 };
466
467 static struct inode *
468 rpc_get_inode(struct super_block *sb, umode_t mode)
469 {
470 struct inode *inode = new_inode(sb);
471 if (!inode)
472 return NULL;
473 inode->i_ino = get_next_ino();
474 inode->i_mode = mode;
475 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
476 switch (mode & S_IFMT) {
477 case S_IFDIR:
478 inode->i_fop = &simple_dir_operations;
479 inode->i_op = &simple_dir_inode_operations;
480 inc_nlink(inode);
481 default:
482 break;
483 }
484 return inode;
485 }
486
487 static int __rpc_create_common(struct inode *dir, struct dentry *dentry,
488 umode_t mode,
489 const struct file_operations *i_fop,
490 void *private)
491 {
492 struct inode *inode;
493
494 d_drop(dentry);
495 inode = rpc_get_inode(dir->i_sb, mode);
496 if (!inode)
497 goto out_err;
498 inode->i_ino = iunique(dir->i_sb, 100);
499 if (i_fop)
500 inode->i_fop = i_fop;
501 if (private)
502 rpc_inode_setowner(inode, private);
503 d_add(dentry, inode);
504 return 0;
505 out_err:
506 printk(KERN_WARNING "%s: %s failed to allocate inode for dentry %pd\n",
507 __FILE__, __func__, dentry);
508 dput(dentry);
509 return -ENOMEM;
510 }
511
512 static int __rpc_create(struct inode *dir, struct dentry *dentry,
513 umode_t mode,
514 const struct file_operations *i_fop,
515 void *private)
516 {
517 int err;
518
519 err = __rpc_create_common(dir, dentry, S_IFREG | mode, i_fop, private);
520 if (err)
521 return err;
522 fsnotify_create(dir, dentry);
523 return 0;
524 }
525
526 static int __rpc_mkdir(struct inode *dir, struct dentry *dentry,
527 umode_t mode,
528 const struct file_operations *i_fop,
529 void *private)
530 {
531 int err;
532
533 err = __rpc_create_common(dir, dentry, S_IFDIR | mode, i_fop, private);
534 if (err)
535 return err;
536 inc_nlink(dir);
537 fsnotify_mkdir(dir, dentry);
538 return 0;
539 }
540
541 static void
542 init_pipe(struct rpc_pipe *pipe)
543 {
544 pipe->nreaders = 0;
545 pipe->nwriters = 0;
546 INIT_LIST_HEAD(&pipe->in_upcall);
547 INIT_LIST_HEAD(&pipe->in_downcall);
548 INIT_LIST_HEAD(&pipe->pipe);
549 pipe->pipelen = 0;
550 INIT_DELAYED_WORK(&pipe->queue_timeout,
551 rpc_timeout_upcall_queue);
552 pipe->ops = NULL;
553 spin_lock_init(&pipe->lock);
554 pipe->dentry = NULL;
555 }
556
557 void rpc_destroy_pipe_data(struct rpc_pipe *pipe)
558 {
559 kfree(pipe);
560 }
561 EXPORT_SYMBOL_GPL(rpc_destroy_pipe_data);
562
563 struct rpc_pipe *rpc_mkpipe_data(const struct rpc_pipe_ops *ops, int flags)
564 {
565 struct rpc_pipe *pipe;
566
567 pipe = kzalloc(sizeof(struct rpc_pipe), GFP_KERNEL);
568 if (!pipe)
569 return ERR_PTR(-ENOMEM);
570 init_pipe(pipe);
571 pipe->ops = ops;
572 pipe->flags = flags;
573 return pipe;
574 }
575 EXPORT_SYMBOL_GPL(rpc_mkpipe_data);
576
577 static int __rpc_mkpipe_dentry(struct inode *dir, struct dentry *dentry,
578 umode_t mode,
579 const struct file_operations *i_fop,
580 void *private,
581 struct rpc_pipe *pipe)
582 {
583 struct rpc_inode *rpci;
584 int err;
585
586 err = __rpc_create_common(dir, dentry, S_IFIFO | mode, i_fop, private);
587 if (err)
588 return err;
589 rpci = RPC_I(d_inode(dentry));
590 rpci->private = private;
591 rpci->pipe = pipe;
592 fsnotify_create(dir, dentry);
593 return 0;
594 }
595
596 static int __rpc_rmdir(struct inode *dir, struct dentry *dentry)
597 {
598 int ret;
599
600 dget(dentry);
601 ret = simple_rmdir(dir, dentry);
602 if (!ret)
603 fsnotify_rmdir(dir, dentry);
604 d_delete(dentry);
605 dput(dentry);
606 return ret;
607 }
608
609 static int __rpc_unlink(struct inode *dir, struct dentry *dentry)
610 {
611 int ret;
612
613 dget(dentry);
614 ret = simple_unlink(dir, dentry);
615 if (!ret)
616 fsnotify_unlink(dir, dentry);
617 d_delete(dentry);
618 dput(dentry);
619 return ret;
620 }
621
622 static int __rpc_rmpipe(struct inode *dir, struct dentry *dentry)
623 {
624 struct inode *inode = d_inode(dentry);
625
626 rpc_close_pipes(inode);
627 return __rpc_unlink(dir, dentry);
628 }
629
630 static struct dentry *__rpc_lookup_create_exclusive(struct dentry *parent,
631 const char *name)
632 {
633 struct qstr q = QSTR_INIT(name, strlen(name));
634 struct dentry *dentry = d_hash_and_lookup(parent, &q);
635 if (!dentry) {
636 dentry = d_alloc(parent, &q);
637 if (!dentry)
638 return ERR_PTR(-ENOMEM);
639 }
640 if (d_really_is_negative(dentry))
641 return dentry;
642 dput(dentry);
643 return ERR_PTR(-EEXIST);
644 }
645
646
647
648
649 static void __rpc_depopulate(struct dentry *parent,
650 const struct rpc_filelist *files,
651 int start, int eof)
652 {
653 struct inode *dir = d_inode(parent);
654 struct dentry *dentry;
655 struct qstr name;
656 int i;
657
658 for (i = start; i < eof; i++) {
659 name.name = files[i].name;
660 name.len = strlen(files[i].name);
661 dentry = d_hash_and_lookup(parent, &name);
662
663 if (dentry == NULL)
664 continue;
665 if (d_really_is_negative(dentry))
666 goto next;
667 switch (d_inode(dentry)->i_mode & S_IFMT) {
668 default:
669 BUG();
670 case S_IFREG:
671 __rpc_unlink(dir, dentry);
672 break;
673 case S_IFDIR:
674 __rpc_rmdir(dir, dentry);
675 }
676 next:
677 dput(dentry);
678 }
679 }
680
681 static void rpc_depopulate(struct dentry *parent,
682 const struct rpc_filelist *files,
683 int start, int eof)
684 {
685 struct inode *dir = d_inode(parent);
686
687 inode_lock_nested(dir, I_MUTEX_CHILD);
688 __rpc_depopulate(parent, files, start, eof);
689 inode_unlock(dir);
690 }
691
692 static int rpc_populate(struct dentry *parent,
693 const struct rpc_filelist *files,
694 int start, int eof,
695 void *private)
696 {
697 struct inode *dir = d_inode(parent);
698 struct dentry *dentry;
699 int i, err;
700
701 inode_lock(dir);
702 for (i = start; i < eof; i++) {
703 dentry = __rpc_lookup_create_exclusive(parent, files[i].name);
704 err = PTR_ERR(dentry);
705 if (IS_ERR(dentry))
706 goto out_bad;
707 switch (files[i].mode & S_IFMT) {
708 default:
709 BUG();
710 case S_IFREG:
711 err = __rpc_create(dir, dentry,
712 files[i].mode,
713 files[i].i_fop,
714 private);
715 break;
716 case S_IFDIR:
717 err = __rpc_mkdir(dir, dentry,
718 files[i].mode,
719 NULL,
720 private);
721 }
722 if (err != 0)
723 goto out_bad;
724 }
725 inode_unlock(dir);
726 return 0;
727 out_bad:
728 __rpc_depopulate(parent, files, start, eof);
729 inode_unlock(dir);
730 printk(KERN_WARNING "%s: %s failed to populate directory %pd\n",
731 __FILE__, __func__, parent);
732 return err;
733 }
734
735 static struct dentry *rpc_mkdir_populate(struct dentry *parent,
736 const char *name, umode_t mode, void *private,
737 int (*populate)(struct dentry *, void *), void *args_populate)
738 {
739 struct dentry *dentry;
740 struct inode *dir = d_inode(parent);
741 int error;
742
743 inode_lock_nested(dir, I_MUTEX_PARENT);
744 dentry = __rpc_lookup_create_exclusive(parent, name);
745 if (IS_ERR(dentry))
746 goto out;
747 error = __rpc_mkdir(dir, dentry, mode, NULL, private);
748 if (error != 0)
749 goto out_err;
750 if (populate != NULL) {
751 error = populate(dentry, args_populate);
752 if (error)
753 goto err_rmdir;
754 }
755 out:
756 inode_unlock(dir);
757 return dentry;
758 err_rmdir:
759 __rpc_rmdir(dir, dentry);
760 out_err:
761 dentry = ERR_PTR(error);
762 goto out;
763 }
764
765 static int rpc_rmdir_depopulate(struct dentry *dentry,
766 void (*depopulate)(struct dentry *))
767 {
768 struct dentry *parent;
769 struct inode *dir;
770 int error;
771
772 parent = dget_parent(dentry);
773 dir = d_inode(parent);
774 inode_lock_nested(dir, I_MUTEX_PARENT);
775 if (depopulate != NULL)
776 depopulate(dentry);
777 error = __rpc_rmdir(dir, dentry);
778 inode_unlock(dir);
779 dput(parent);
780 return error;
781 }
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801 struct dentry *rpc_mkpipe_dentry(struct dentry *parent, const char *name,
802 void *private, struct rpc_pipe *pipe)
803 {
804 struct dentry *dentry;
805 struct inode *dir = d_inode(parent);
806 umode_t umode = S_IFIFO | 0600;
807 int err;
808
809 if (pipe->ops->upcall == NULL)
810 umode &= ~0444;
811 if (pipe->ops->downcall == NULL)
812 umode &= ~0222;
813
814 inode_lock_nested(dir, I_MUTEX_PARENT);
815 dentry = __rpc_lookup_create_exclusive(parent, name);
816 if (IS_ERR(dentry))
817 goto out;
818 err = __rpc_mkpipe_dentry(dir, dentry, umode, &rpc_pipe_fops,
819 private, pipe);
820 if (err)
821 goto out_err;
822 out:
823 inode_unlock(dir);
824 return dentry;
825 out_err:
826 dentry = ERR_PTR(err);
827 printk(KERN_WARNING "%s: %s() failed to create pipe %pd/%s (errno = %d)\n",
828 __FILE__, __func__, parent, name,
829 err);
830 goto out;
831 }
832 EXPORT_SYMBOL_GPL(rpc_mkpipe_dentry);
833
834
835
836
837
838
839
840
841
842 int
843 rpc_unlink(struct dentry *dentry)
844 {
845 struct dentry *parent;
846 struct inode *dir;
847 int error = 0;
848
849 parent = dget_parent(dentry);
850 dir = d_inode(parent);
851 inode_lock_nested(dir, I_MUTEX_PARENT);
852 error = __rpc_rmpipe(dir, dentry);
853 inode_unlock(dir);
854 dput(parent);
855 return error;
856 }
857 EXPORT_SYMBOL_GPL(rpc_unlink);
858
859
860
861
862
863 void rpc_init_pipe_dir_head(struct rpc_pipe_dir_head *pdh)
864 {
865 INIT_LIST_HEAD(&pdh->pdh_entries);
866 pdh->pdh_dentry = NULL;
867 }
868 EXPORT_SYMBOL_GPL(rpc_init_pipe_dir_head);
869
870
871
872
873
874
875
876 void rpc_init_pipe_dir_object(struct rpc_pipe_dir_object *pdo,
877 const struct rpc_pipe_dir_object_ops *pdo_ops,
878 void *pdo_data)
879 {
880 INIT_LIST_HEAD(&pdo->pdo_head);
881 pdo->pdo_ops = pdo_ops;
882 pdo->pdo_data = pdo_data;
883 }
884 EXPORT_SYMBOL_GPL(rpc_init_pipe_dir_object);
885
886 static int
887 rpc_add_pipe_dir_object_locked(struct net *net,
888 struct rpc_pipe_dir_head *pdh,
889 struct rpc_pipe_dir_object *pdo)
890 {
891 int ret = 0;
892
893 if (pdh->pdh_dentry)
894 ret = pdo->pdo_ops->create(pdh->pdh_dentry, pdo);
895 if (ret == 0)
896 list_add_tail(&pdo->pdo_head, &pdh->pdh_entries);
897 return ret;
898 }
899
900 static void
901 rpc_remove_pipe_dir_object_locked(struct net *net,
902 struct rpc_pipe_dir_head *pdh,
903 struct rpc_pipe_dir_object *pdo)
904 {
905 if (pdh->pdh_dentry)
906 pdo->pdo_ops->destroy(pdh->pdh_dentry, pdo);
907 list_del_init(&pdo->pdo_head);
908 }
909
910
911
912
913
914
915
916
917 int
918 rpc_add_pipe_dir_object(struct net *net,
919 struct rpc_pipe_dir_head *pdh,
920 struct rpc_pipe_dir_object *pdo)
921 {
922 int ret = 0;
923
924 if (list_empty(&pdo->pdo_head)) {
925 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
926
927 mutex_lock(&sn->pipefs_sb_lock);
928 ret = rpc_add_pipe_dir_object_locked(net, pdh, pdo);
929 mutex_unlock(&sn->pipefs_sb_lock);
930 }
931 return ret;
932 }
933 EXPORT_SYMBOL_GPL(rpc_add_pipe_dir_object);
934
935
936
937
938
939
940
941
942 void
943 rpc_remove_pipe_dir_object(struct net *net,
944 struct rpc_pipe_dir_head *pdh,
945 struct rpc_pipe_dir_object *pdo)
946 {
947 if (!list_empty(&pdo->pdo_head)) {
948 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
949
950 mutex_lock(&sn->pipefs_sb_lock);
951 rpc_remove_pipe_dir_object_locked(net, pdh, pdo);
952 mutex_unlock(&sn->pipefs_sb_lock);
953 }
954 }
955 EXPORT_SYMBOL_GPL(rpc_remove_pipe_dir_object);
956
957
958
959
960
961
962
963
964
965
966 struct rpc_pipe_dir_object *
967 rpc_find_or_alloc_pipe_dir_object(struct net *net,
968 struct rpc_pipe_dir_head *pdh,
969 int (*match)(struct rpc_pipe_dir_object *, void *),
970 struct rpc_pipe_dir_object *(*alloc)(void *),
971 void *data)
972 {
973 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
974 struct rpc_pipe_dir_object *pdo;
975
976 mutex_lock(&sn->pipefs_sb_lock);
977 list_for_each_entry(pdo, &pdh->pdh_entries, pdo_head) {
978 if (!match(pdo, data))
979 continue;
980 goto out;
981 }
982 pdo = alloc(data);
983 if (!pdo)
984 goto out;
985 rpc_add_pipe_dir_object_locked(net, pdh, pdo);
986 out:
987 mutex_unlock(&sn->pipefs_sb_lock);
988 return pdo;
989 }
990 EXPORT_SYMBOL_GPL(rpc_find_or_alloc_pipe_dir_object);
991
992 static void
993 rpc_create_pipe_dir_objects(struct rpc_pipe_dir_head *pdh)
994 {
995 struct rpc_pipe_dir_object *pdo;
996 struct dentry *dir = pdh->pdh_dentry;
997
998 list_for_each_entry(pdo, &pdh->pdh_entries, pdo_head)
999 pdo->pdo_ops->create(dir, pdo);
1000 }
1001
1002 static void
1003 rpc_destroy_pipe_dir_objects(struct rpc_pipe_dir_head *pdh)
1004 {
1005 struct rpc_pipe_dir_object *pdo;
1006 struct dentry *dir = pdh->pdh_dentry;
1007
1008 list_for_each_entry(pdo, &pdh->pdh_entries, pdo_head)
1009 pdo->pdo_ops->destroy(dir, pdo);
1010 }
1011
1012 enum {
1013 RPCAUTH_info,
1014 RPCAUTH_EOF
1015 };
1016
1017 static const struct rpc_filelist authfiles[] = {
1018 [RPCAUTH_info] = {
1019 .name = "info",
1020 .i_fop = &rpc_info_operations,
1021 .mode = S_IFREG | 0400,
1022 },
1023 };
1024
1025 static int rpc_clntdir_populate(struct dentry *dentry, void *private)
1026 {
1027 return rpc_populate(dentry,
1028 authfiles, RPCAUTH_info, RPCAUTH_EOF,
1029 private);
1030 }
1031
1032 static void rpc_clntdir_depopulate(struct dentry *dentry)
1033 {
1034 rpc_depopulate(dentry, authfiles, RPCAUTH_info, RPCAUTH_EOF);
1035 }
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048 struct dentry *rpc_create_client_dir(struct dentry *dentry,
1049 const char *name,
1050 struct rpc_clnt *rpc_client)
1051 {
1052 struct dentry *ret;
1053
1054 ret = rpc_mkdir_populate(dentry, name, 0555, NULL,
1055 rpc_clntdir_populate, rpc_client);
1056 if (!IS_ERR(ret)) {
1057 rpc_client->cl_pipedir_objects.pdh_dentry = ret;
1058 rpc_create_pipe_dir_objects(&rpc_client->cl_pipedir_objects);
1059 }
1060 return ret;
1061 }
1062
1063
1064
1065
1066
1067 int rpc_remove_client_dir(struct rpc_clnt *rpc_client)
1068 {
1069 struct dentry *dentry = rpc_client->cl_pipedir_objects.pdh_dentry;
1070
1071 if (dentry == NULL)
1072 return 0;
1073 rpc_destroy_pipe_dir_objects(&rpc_client->cl_pipedir_objects);
1074 rpc_client->cl_pipedir_objects.pdh_dentry = NULL;
1075 return rpc_rmdir_depopulate(dentry, rpc_clntdir_depopulate);
1076 }
1077
1078 static const struct rpc_filelist cache_pipefs_files[3] = {
1079 [0] = {
1080 .name = "channel",
1081 .i_fop = &cache_file_operations_pipefs,
1082 .mode = S_IFREG | 0600,
1083 },
1084 [1] = {
1085 .name = "content",
1086 .i_fop = &content_file_operations_pipefs,
1087 .mode = S_IFREG | 0400,
1088 },
1089 [2] = {
1090 .name = "flush",
1091 .i_fop = &cache_flush_operations_pipefs,
1092 .mode = S_IFREG | 0600,
1093 },
1094 };
1095
1096 static int rpc_cachedir_populate(struct dentry *dentry, void *private)
1097 {
1098 return rpc_populate(dentry,
1099 cache_pipefs_files, 0, 3,
1100 private);
1101 }
1102
1103 static void rpc_cachedir_depopulate(struct dentry *dentry)
1104 {
1105 rpc_depopulate(dentry, cache_pipefs_files, 0, 3);
1106 }
1107
1108 struct dentry *rpc_create_cache_dir(struct dentry *parent, const char *name,
1109 umode_t umode, struct cache_detail *cd)
1110 {
1111 return rpc_mkdir_populate(parent, name, umode, NULL,
1112 rpc_cachedir_populate, cd);
1113 }
1114
1115 void rpc_remove_cache_dir(struct dentry *dentry)
1116 {
1117 rpc_rmdir_depopulate(dentry, rpc_cachedir_depopulate);
1118 }
1119
1120
1121
1122
1123 static const struct super_operations s_ops = {
1124 .alloc_inode = rpc_alloc_inode,
1125 .free_inode = rpc_free_inode,
1126 .statfs = simple_statfs,
1127 };
1128
1129 #define RPCAUTH_GSSMAGIC 0x67596969
1130
1131
1132
1133
1134 enum {
1135 RPCAUTH_lockd,
1136 RPCAUTH_mount,
1137 RPCAUTH_nfs,
1138 RPCAUTH_portmap,
1139 RPCAUTH_statd,
1140 RPCAUTH_nfsd4_cb,
1141 RPCAUTH_cache,
1142 RPCAUTH_nfsd,
1143 RPCAUTH_gssd,
1144 RPCAUTH_RootEOF
1145 };
1146
1147 static const struct rpc_filelist files[] = {
1148 [RPCAUTH_lockd] = {
1149 .name = "lockd",
1150 .mode = S_IFDIR | 0555,
1151 },
1152 [RPCAUTH_mount] = {
1153 .name = "mount",
1154 .mode = S_IFDIR | 0555,
1155 },
1156 [RPCAUTH_nfs] = {
1157 .name = "nfs",
1158 .mode = S_IFDIR | 0555,
1159 },
1160 [RPCAUTH_portmap] = {
1161 .name = "portmap",
1162 .mode = S_IFDIR | 0555,
1163 },
1164 [RPCAUTH_statd] = {
1165 .name = "statd",
1166 .mode = S_IFDIR | 0555,
1167 },
1168 [RPCAUTH_nfsd4_cb] = {
1169 .name = "nfsd4_cb",
1170 .mode = S_IFDIR | 0555,
1171 },
1172 [RPCAUTH_cache] = {
1173 .name = "cache",
1174 .mode = S_IFDIR | 0555,
1175 },
1176 [RPCAUTH_nfsd] = {
1177 .name = "nfsd",
1178 .mode = S_IFDIR | 0555,
1179 },
1180 [RPCAUTH_gssd] = {
1181 .name = "gssd",
1182 .mode = S_IFDIR | 0555,
1183 },
1184 };
1185
1186
1187
1188
1189 struct dentry *rpc_d_lookup_sb(const struct super_block *sb,
1190 const unsigned char *dir_name)
1191 {
1192 struct qstr dir = QSTR_INIT(dir_name, strlen(dir_name));
1193 return d_hash_and_lookup(sb->s_root, &dir);
1194 }
1195 EXPORT_SYMBOL_GPL(rpc_d_lookup_sb);
1196
1197 int rpc_pipefs_init_net(struct net *net)
1198 {
1199 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1200
1201 sn->gssd_dummy = rpc_mkpipe_data(&gssd_dummy_pipe_ops, 0);
1202 if (IS_ERR(sn->gssd_dummy))
1203 return PTR_ERR(sn->gssd_dummy);
1204
1205 mutex_init(&sn->pipefs_sb_lock);
1206 sn->pipe_version = -1;
1207 return 0;
1208 }
1209
1210 void rpc_pipefs_exit_net(struct net *net)
1211 {
1212 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1213
1214 rpc_destroy_pipe_data(sn->gssd_dummy);
1215 }
1216
1217
1218
1219
1220
1221
1222
1223 struct super_block *rpc_get_sb_net(const struct net *net)
1224 {
1225 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1226
1227 mutex_lock(&sn->pipefs_sb_lock);
1228 if (sn->pipefs_sb)
1229 return sn->pipefs_sb;
1230 mutex_unlock(&sn->pipefs_sb_lock);
1231 return NULL;
1232 }
1233 EXPORT_SYMBOL_GPL(rpc_get_sb_net);
1234
1235 void rpc_put_sb_net(const struct net *net)
1236 {
1237 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1238
1239 WARN_ON(sn->pipefs_sb == NULL);
1240 mutex_unlock(&sn->pipefs_sb_lock);
1241 }
1242 EXPORT_SYMBOL_GPL(rpc_put_sb_net);
1243
1244 static const struct rpc_filelist gssd_dummy_clnt_dir[] = {
1245 [0] = {
1246 .name = "clntXX",
1247 .mode = S_IFDIR | 0555,
1248 },
1249 };
1250
1251 static ssize_t
1252 dummy_downcall(struct file *filp, const char __user *src, size_t len)
1253 {
1254 return -EINVAL;
1255 }
1256
1257 static const struct rpc_pipe_ops gssd_dummy_pipe_ops = {
1258 .upcall = rpc_pipe_generic_upcall,
1259 .downcall = dummy_downcall,
1260 };
1261
1262
1263
1264
1265
1266
1267 static int
1268 rpc_dummy_info_show(struct seq_file *m, void *v)
1269 {
1270 seq_printf(m, "RPC server: %s\n", utsname()->nodename);
1271 seq_printf(m, "service: foo (1) version 0\n");
1272 seq_printf(m, "address: 127.0.0.1\n");
1273 seq_printf(m, "protocol: tcp\n");
1274 seq_printf(m, "port: 0\n");
1275 return 0;
1276 }
1277 DEFINE_SHOW_ATTRIBUTE(rpc_dummy_info);
1278
1279 static const struct rpc_filelist gssd_dummy_info_file[] = {
1280 [0] = {
1281 .name = "info",
1282 .i_fop = &rpc_dummy_info_fops,
1283 .mode = S_IFREG | 0400,
1284 },
1285 };
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295 static struct dentry *
1296 rpc_gssd_dummy_populate(struct dentry *root, struct rpc_pipe *pipe_data)
1297 {
1298 int ret = 0;
1299 struct dentry *gssd_dentry;
1300 struct dentry *clnt_dentry = NULL;
1301 struct dentry *pipe_dentry = NULL;
1302 struct qstr q = QSTR_INIT(files[RPCAUTH_gssd].name,
1303 strlen(files[RPCAUTH_gssd].name));
1304
1305
1306 gssd_dentry = d_hash_and_lookup(root, &q);
1307 if (!gssd_dentry)
1308 return ERR_PTR(-ENOENT);
1309
1310 ret = rpc_populate(gssd_dentry, gssd_dummy_clnt_dir, 0, 1, NULL);
1311 if (ret) {
1312 pipe_dentry = ERR_PTR(ret);
1313 goto out;
1314 }
1315
1316 q.name = gssd_dummy_clnt_dir[0].name;
1317 q.len = strlen(gssd_dummy_clnt_dir[0].name);
1318 clnt_dentry = d_hash_and_lookup(gssd_dentry, &q);
1319 if (!clnt_dentry) {
1320 pipe_dentry = ERR_PTR(-ENOENT);
1321 goto out;
1322 }
1323
1324 ret = rpc_populate(clnt_dentry, gssd_dummy_info_file, 0, 1, NULL);
1325 if (ret) {
1326 __rpc_depopulate(gssd_dentry, gssd_dummy_clnt_dir, 0, 1);
1327 pipe_dentry = ERR_PTR(ret);
1328 goto out;
1329 }
1330
1331 pipe_dentry = rpc_mkpipe_dentry(clnt_dentry, "gssd", NULL, pipe_data);
1332 if (IS_ERR(pipe_dentry)) {
1333 __rpc_depopulate(clnt_dentry, gssd_dummy_info_file, 0, 1);
1334 __rpc_depopulate(gssd_dentry, gssd_dummy_clnt_dir, 0, 1);
1335 }
1336 out:
1337 dput(clnt_dentry);
1338 dput(gssd_dentry);
1339 return pipe_dentry;
1340 }
1341
1342 static void
1343 rpc_gssd_dummy_depopulate(struct dentry *pipe_dentry)
1344 {
1345 struct dentry *clnt_dir = pipe_dentry->d_parent;
1346 struct dentry *gssd_dir = clnt_dir->d_parent;
1347
1348 dget(pipe_dentry);
1349 __rpc_rmpipe(d_inode(clnt_dir), pipe_dentry);
1350 __rpc_depopulate(clnt_dir, gssd_dummy_info_file, 0, 1);
1351 __rpc_depopulate(gssd_dir, gssd_dummy_clnt_dir, 0, 1);
1352 dput(pipe_dentry);
1353 }
1354
1355 static int
1356 rpc_fill_super(struct super_block *sb, struct fs_context *fc)
1357 {
1358 struct inode *inode;
1359 struct dentry *root, *gssd_dentry;
1360 struct net *net = sb->s_fs_info;
1361 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1362 int err;
1363
1364 sb->s_blocksize = PAGE_SIZE;
1365 sb->s_blocksize_bits = PAGE_SHIFT;
1366 sb->s_magic = RPCAUTH_GSSMAGIC;
1367 sb->s_op = &s_ops;
1368 sb->s_d_op = &simple_dentry_operations;
1369 sb->s_time_gran = 1;
1370
1371 inode = rpc_get_inode(sb, S_IFDIR | 0555);
1372 sb->s_root = root = d_make_root(inode);
1373 if (!root)
1374 return -ENOMEM;
1375 if (rpc_populate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF, NULL))
1376 return -ENOMEM;
1377
1378 gssd_dentry = rpc_gssd_dummy_populate(root, sn->gssd_dummy);
1379 if (IS_ERR(gssd_dentry)) {
1380 __rpc_depopulate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF);
1381 return PTR_ERR(gssd_dentry);
1382 }
1383
1384 dprintk("RPC: sending pipefs MOUNT notification for net %x%s\n",
1385 net->ns.inum, NET_NAME(net));
1386 mutex_lock(&sn->pipefs_sb_lock);
1387 sn->pipefs_sb = sb;
1388 err = blocking_notifier_call_chain(&rpc_pipefs_notifier_list,
1389 RPC_PIPEFS_MOUNT,
1390 sb);
1391 if (err)
1392 goto err_depopulate;
1393 mutex_unlock(&sn->pipefs_sb_lock);
1394 return 0;
1395
1396 err_depopulate:
1397 rpc_gssd_dummy_depopulate(gssd_dentry);
1398 blocking_notifier_call_chain(&rpc_pipefs_notifier_list,
1399 RPC_PIPEFS_UMOUNT,
1400 sb);
1401 sn->pipefs_sb = NULL;
1402 __rpc_depopulate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF);
1403 mutex_unlock(&sn->pipefs_sb_lock);
1404 return err;
1405 }
1406
1407 bool
1408 gssd_running(struct net *net)
1409 {
1410 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1411 struct rpc_pipe *pipe = sn->gssd_dummy;
1412
1413 return pipe->nreaders || pipe->nwriters;
1414 }
1415 EXPORT_SYMBOL_GPL(gssd_running);
1416
1417 static int rpc_fs_get_tree(struct fs_context *fc)
1418 {
1419 return get_tree_keyed(fc, rpc_fill_super, get_net(fc->net_ns));
1420 }
1421
1422 static void rpc_fs_free_fc(struct fs_context *fc)
1423 {
1424 if (fc->s_fs_info)
1425 put_net(fc->s_fs_info);
1426 }
1427
1428 static const struct fs_context_operations rpc_fs_context_ops = {
1429 .free = rpc_fs_free_fc,
1430 .get_tree = rpc_fs_get_tree,
1431 };
1432
1433 static int rpc_init_fs_context(struct fs_context *fc)
1434 {
1435 put_user_ns(fc->user_ns);
1436 fc->user_ns = get_user_ns(fc->net_ns->user_ns);
1437 fc->ops = &rpc_fs_context_ops;
1438 return 0;
1439 }
1440
1441 static void rpc_kill_sb(struct super_block *sb)
1442 {
1443 struct net *net = sb->s_fs_info;
1444 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1445
1446 mutex_lock(&sn->pipefs_sb_lock);
1447 if (sn->pipefs_sb != sb) {
1448 mutex_unlock(&sn->pipefs_sb_lock);
1449 goto out;
1450 }
1451 sn->pipefs_sb = NULL;
1452 dprintk("RPC: sending pipefs UMOUNT notification for net %x%s\n",
1453 net->ns.inum, NET_NAME(net));
1454 blocking_notifier_call_chain(&rpc_pipefs_notifier_list,
1455 RPC_PIPEFS_UMOUNT,
1456 sb);
1457 mutex_unlock(&sn->pipefs_sb_lock);
1458 out:
1459 kill_litter_super(sb);
1460 put_net(net);
1461 }
1462
1463 static struct file_system_type rpc_pipe_fs_type = {
1464 .owner = THIS_MODULE,
1465 .name = "rpc_pipefs",
1466 .init_fs_context = rpc_init_fs_context,
1467 .kill_sb = rpc_kill_sb,
1468 };
1469 MODULE_ALIAS_FS("rpc_pipefs");
1470 MODULE_ALIAS("rpc_pipefs");
1471
1472 static void
1473 init_once(void *foo)
1474 {
1475 struct rpc_inode *rpci = (struct rpc_inode *) foo;
1476
1477 inode_init_once(&rpci->vfs_inode);
1478 rpci->private = NULL;
1479 rpci->pipe = NULL;
1480 init_waitqueue_head(&rpci->waitq);
1481 }
1482
1483 int register_rpc_pipefs(void)
1484 {
1485 int err;
1486
1487 rpc_inode_cachep = kmem_cache_create("rpc_inode_cache",
1488 sizeof(struct rpc_inode),
1489 0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1490 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
1491 init_once);
1492 if (!rpc_inode_cachep)
1493 return -ENOMEM;
1494 err = rpc_clients_notifier_register();
1495 if (err)
1496 goto err_notifier;
1497 err = register_filesystem(&rpc_pipe_fs_type);
1498 if (err)
1499 goto err_register;
1500 return 0;
1501
1502 err_register:
1503 rpc_clients_notifier_unregister();
1504 err_notifier:
1505 kmem_cache_destroy(rpc_inode_cachep);
1506 return err;
1507 }
1508
1509 void unregister_rpc_pipefs(void)
1510 {
1511 rpc_clients_notifier_unregister();
1512 kmem_cache_destroy(rpc_inode_cachep);
1513 unregister_filesystem(&rpc_pipe_fs_type);
1514 }