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11#include <linux/module.h>
12#include <linux/slab.h>
13#include <linux/string.h>
14#include <linux/pagemap.h>
15#include <linux/mount.h>
16#include <linux/fs_context.h>
17#include <linux/namei.h>
18#include <linux/fsnotify.h>
19#include <linux/kernel.h>
20#include <linux/rcupdate.h>
21#include <linux/utsname.h>
22
23#include <asm/ioctls.h>
24#include <linux/poll.h>
25#include <linux/wait.h>
26#include <linux/seq_file.h>
27
28#include <linux/sunrpc/clnt.h>
29#include <linux/workqueue.h>
30#include <linux/sunrpc/rpc_pipe_fs.h>
31#include <linux/sunrpc/cache.h>
32#include <linux/nsproxy.h>
33#include <linux/notifier.h>
34
35#include "netns.h"
36#include "sunrpc.h"
37
38#define RPCDBG_FACILITY RPCDBG_DEBUG
39
40#define NET_NAME(net) ((net == &init_net) ? " (init_net)" : "")
41
42static struct file_system_type rpc_pipe_fs_type;
43static const struct rpc_pipe_ops gssd_dummy_pipe_ops;
44
45static struct kmem_cache *rpc_inode_cachep __read_mostly;
46
47#define RPC_UPCALL_TIMEOUT (30*HZ)
48
49static BLOCKING_NOTIFIER_HEAD(rpc_pipefs_notifier_list);
50
51int rpc_pipefs_notifier_register(struct notifier_block *nb)
52{
53 return blocking_notifier_chain_cond_register(&rpc_pipefs_notifier_list, nb);
54}
55EXPORT_SYMBOL_GPL(rpc_pipefs_notifier_register);
56
57void rpc_pipefs_notifier_unregister(struct notifier_block *nb)
58{
59 blocking_notifier_chain_unregister(&rpc_pipefs_notifier_list, nb);
60}
61EXPORT_SYMBOL_GPL(rpc_pipefs_notifier_unregister);
62
63static void rpc_purge_list(wait_queue_head_t *waitq, struct list_head *head,
64 void (*destroy_msg)(struct rpc_pipe_msg *), int err)
65{
66 struct rpc_pipe_msg *msg;
67
68 if (list_empty(head))
69 return;
70 do {
71 msg = list_entry(head->next, struct rpc_pipe_msg, list);
72 list_del_init(&msg->list);
73 msg->errno = err;
74 destroy_msg(msg);
75 } while (!list_empty(head));
76
77 if (waitq)
78 wake_up(waitq);
79}
80
81static void
82rpc_timeout_upcall_queue(struct work_struct *work)
83{
84 LIST_HEAD(free_list);
85 struct rpc_pipe *pipe =
86 container_of(work, struct rpc_pipe, queue_timeout.work);
87 void (*destroy_msg)(struct rpc_pipe_msg *);
88 struct dentry *dentry;
89
90 spin_lock(&pipe->lock);
91 destroy_msg = pipe->ops->destroy_msg;
92 if (pipe->nreaders == 0) {
93 list_splice_init(&pipe->pipe, &free_list);
94 pipe->pipelen = 0;
95 }
96 dentry = dget(pipe->dentry);
97 spin_unlock(&pipe->lock);
98 rpc_purge_list(dentry ? &RPC_I(d_inode(dentry))->waitq : NULL,
99 &free_list, destroy_msg, -ETIMEDOUT);
100 dput(dentry);
101}
102
103ssize_t rpc_pipe_generic_upcall(struct file *filp, struct rpc_pipe_msg *msg,
104 char __user *dst, size_t buflen)
105{
106 char *data = (char *)msg->data + msg->copied;
107 size_t mlen = min(msg->len - msg->copied, buflen);
108 unsigned long left;
109
110 left = copy_to_user(dst, data, mlen);
111 if (left == mlen) {
112 msg->errno = -EFAULT;
113 return -EFAULT;
114 }
115
116 mlen -= left;
117 msg->copied += mlen;
118 msg->errno = 0;
119 return mlen;
120}
121EXPORT_SYMBOL_GPL(rpc_pipe_generic_upcall);
122
123
124
125
126
127
128
129
130
131
132
133int
134rpc_queue_upcall(struct rpc_pipe *pipe, struct rpc_pipe_msg *msg)
135{
136 int res = -EPIPE;
137 struct dentry *dentry;
138
139 spin_lock(&pipe->lock);
140 if (pipe->nreaders) {
141 list_add_tail(&msg->list, &pipe->pipe);
142 pipe->pipelen += msg->len;
143 res = 0;
144 } else if (pipe->flags & RPC_PIPE_WAIT_FOR_OPEN) {
145 if (list_empty(&pipe->pipe))
146 queue_delayed_work(rpciod_workqueue,
147 &pipe->queue_timeout,
148 RPC_UPCALL_TIMEOUT);
149 list_add_tail(&msg->list, &pipe->pipe);
150 pipe->pipelen += msg->len;
151 res = 0;
152 }
153 dentry = dget(pipe->dentry);
154 spin_unlock(&pipe->lock);
155 if (dentry) {
156 wake_up(&RPC_I(d_inode(dentry))->waitq);
157 dput(dentry);
158 }
159 return res;
160}
161EXPORT_SYMBOL_GPL(rpc_queue_upcall);
162
163static inline void
164rpc_inode_setowner(struct inode *inode, void *private)
165{
166 RPC_I(inode)->private = private;
167}
168
169static void
170rpc_close_pipes(struct inode *inode)
171{
172 struct rpc_pipe *pipe = RPC_I(inode)->pipe;
173 int need_release;
174 LIST_HEAD(free_list);
175
176 inode_lock(inode);
177 spin_lock(&pipe->lock);
178 need_release = pipe->nreaders != 0 || pipe->nwriters != 0;
179 pipe->nreaders = 0;
180 list_splice_init(&pipe->in_upcall, &free_list);
181 list_splice_init(&pipe->pipe, &free_list);
182 pipe->pipelen = 0;
183 pipe->dentry = NULL;
184 spin_unlock(&pipe->lock);
185 rpc_purge_list(&RPC_I(inode)->waitq, &free_list, pipe->ops->destroy_msg, -EPIPE);
186 pipe->nwriters = 0;
187 if (need_release && pipe->ops->release_pipe)
188 pipe->ops->release_pipe(inode);
189 cancel_delayed_work_sync(&pipe->queue_timeout);
190 rpc_inode_setowner(inode, NULL);
191 RPC_I(inode)->pipe = NULL;
192 inode_unlock(inode);
193}
194
195static struct inode *
196rpc_alloc_inode(struct super_block *sb)
197{
198 struct rpc_inode *rpci;
199 rpci = kmem_cache_alloc(rpc_inode_cachep, GFP_KERNEL);
200 if (!rpci)
201 return NULL;
202 return &rpci->vfs_inode;
203}
204
205static void
206rpc_i_callback(struct rcu_head *head)
207{
208 struct inode *inode = container_of(head, struct inode, i_rcu);
209 kmem_cache_free(rpc_inode_cachep, RPC_I(inode));
210}
211
212static void
213rpc_destroy_inode(struct inode *inode)
214{
215 call_rcu(&inode->i_rcu, rpc_i_callback);
216}
217
218static int
219rpc_pipe_open(struct inode *inode, struct file *filp)
220{
221 struct rpc_pipe *pipe;
222 int first_open;
223 int res = -ENXIO;
224
225 inode_lock(inode);
226 pipe = RPC_I(inode)->pipe;
227 if (pipe == NULL)
228 goto out;
229 first_open = pipe->nreaders == 0 && pipe->nwriters == 0;
230 if (first_open && pipe->ops->open_pipe) {
231 res = pipe->ops->open_pipe(inode);
232 if (res)
233 goto out;
234 }
235 if (filp->f_mode & FMODE_READ)
236 pipe->nreaders++;
237 if (filp->f_mode & FMODE_WRITE)
238 pipe->nwriters++;
239 res = 0;
240out:
241 inode_unlock(inode);
242 return res;
243}
244
245static int
246rpc_pipe_release(struct inode *inode, struct file *filp)
247{
248 struct rpc_pipe *pipe;
249 struct rpc_pipe_msg *msg;
250 int last_close;
251
252 inode_lock(inode);
253 pipe = RPC_I(inode)->pipe;
254 if (pipe == NULL)
255 goto out;
256 msg = filp->private_data;
257 if (msg != NULL) {
258 spin_lock(&pipe->lock);
259 msg->errno = -EAGAIN;
260 list_del_init(&msg->list);
261 spin_unlock(&pipe->lock);
262 pipe->ops->destroy_msg(msg);
263 }
264 if (filp->f_mode & FMODE_WRITE)
265 pipe->nwriters --;
266 if (filp->f_mode & FMODE_READ) {
267 pipe->nreaders --;
268 if (pipe->nreaders == 0) {
269 LIST_HEAD(free_list);
270 spin_lock(&pipe->lock);
271 list_splice_init(&pipe->pipe, &free_list);
272 pipe->pipelen = 0;
273 spin_unlock(&pipe->lock);
274 rpc_purge_list(&RPC_I(inode)->waitq, &free_list,
275 pipe->ops->destroy_msg, -EAGAIN);
276 }
277 }
278 last_close = pipe->nwriters == 0 && pipe->nreaders == 0;
279 if (last_close && pipe->ops->release_pipe)
280 pipe->ops->release_pipe(inode);
281out:
282 inode_unlock(inode);
283 return 0;
284}
285
286static ssize_t
287rpc_pipe_read(struct file *filp, char __user *buf, size_t len, loff_t *offset)
288{
289 struct inode *inode = file_inode(filp);
290 struct rpc_pipe *pipe;
291 struct rpc_pipe_msg *msg;
292 int res = 0;
293
294 inode_lock(inode);
295 pipe = RPC_I(inode)->pipe;
296 if (pipe == NULL) {
297 res = -EPIPE;
298 goto out_unlock;
299 }
300 msg = filp->private_data;
301 if (msg == NULL) {
302 spin_lock(&pipe->lock);
303 if (!list_empty(&pipe->pipe)) {
304 msg = list_entry(pipe->pipe.next,
305 struct rpc_pipe_msg,
306 list);
307 list_move(&msg->list, &pipe->in_upcall);
308 pipe->pipelen -= msg->len;
309 filp->private_data = msg;
310 msg->copied = 0;
311 }
312 spin_unlock(&pipe->lock);
313 if (msg == NULL)
314 goto out_unlock;
315 }
316
317 res = pipe->ops->upcall(filp, msg, buf, len);
318 if (res < 0 || msg->len == msg->copied) {
319 filp->private_data = NULL;
320 spin_lock(&pipe->lock);
321 list_del_init(&msg->list);
322 spin_unlock(&pipe->lock);
323 pipe->ops->destroy_msg(msg);
324 }
325out_unlock:
326 inode_unlock(inode);
327 return res;
328}
329
330static ssize_t
331rpc_pipe_write(struct file *filp, const char __user *buf, size_t len, loff_t *offset)
332{
333 struct inode *inode = file_inode(filp);
334 int res;
335
336 inode_lock(inode);
337 res = -EPIPE;
338 if (RPC_I(inode)->pipe != NULL)
339 res = RPC_I(inode)->pipe->ops->downcall(filp, buf, len);
340 inode_unlock(inode);
341 return res;
342}
343
344static __poll_t
345rpc_pipe_poll(struct file *filp, struct poll_table_struct *wait)
346{
347 struct inode *inode = file_inode(filp);
348 struct rpc_inode *rpci = RPC_I(inode);
349 __poll_t mask = EPOLLOUT | EPOLLWRNORM;
350
351 poll_wait(filp, &rpci->waitq, wait);
352
353 inode_lock(inode);
354 if (rpci->pipe == NULL)
355 mask |= EPOLLERR | EPOLLHUP;
356 else if (filp->private_data || !list_empty(&rpci->pipe->pipe))
357 mask |= EPOLLIN | EPOLLRDNORM;
358 inode_unlock(inode);
359 return mask;
360}
361
362static long
363rpc_pipe_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
364{
365 struct inode *inode = file_inode(filp);
366 struct rpc_pipe *pipe;
367 int len;
368
369 switch (cmd) {
370 case FIONREAD:
371 inode_lock(inode);
372 pipe = RPC_I(inode)->pipe;
373 if (pipe == NULL) {
374 inode_unlock(inode);
375 return -EPIPE;
376 }
377 spin_lock(&pipe->lock);
378 len = pipe->pipelen;
379 if (filp->private_data) {
380 struct rpc_pipe_msg *msg;
381 msg = filp->private_data;
382 len += msg->len - msg->copied;
383 }
384 spin_unlock(&pipe->lock);
385 inode_unlock(inode);
386 return put_user(len, (int __user *)arg);
387 default:
388 return -EINVAL;
389 }
390}
391
392static const struct file_operations rpc_pipe_fops = {
393 .owner = THIS_MODULE,
394 .llseek = no_llseek,
395 .read = rpc_pipe_read,
396 .write = rpc_pipe_write,
397 .poll = rpc_pipe_poll,
398 .unlocked_ioctl = rpc_pipe_ioctl,
399 .open = rpc_pipe_open,
400 .release = rpc_pipe_release,
401};
402
403static int
404rpc_show_info(struct seq_file *m, void *v)
405{
406 struct rpc_clnt *clnt = m->private;
407
408 rcu_read_lock();
409 seq_printf(m, "RPC server: %s\n",
410 rcu_dereference(clnt->cl_xprt)->servername);
411 seq_printf(m, "service: %s (%d) version %d\n", clnt->cl_program->name,
412 clnt->cl_prog, clnt->cl_vers);
413 seq_printf(m, "address: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_ADDR));
414 seq_printf(m, "protocol: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PROTO));
415 seq_printf(m, "port: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PORT));
416 rcu_read_unlock();
417 return 0;
418}
419
420static int
421rpc_info_open(struct inode *inode, struct file *file)
422{
423 struct rpc_clnt *clnt = NULL;
424 int ret = single_open(file, rpc_show_info, NULL);
425
426 if (!ret) {
427 struct seq_file *m = file->private_data;
428
429 spin_lock(&file->f_path.dentry->d_lock);
430 if (!d_unhashed(file->f_path.dentry))
431 clnt = RPC_I(inode)->private;
432 if (clnt != NULL && atomic_inc_not_zero(&clnt->cl_count)) {
433 spin_unlock(&file->f_path.dentry->d_lock);
434 m->private = clnt;
435 } else {
436 spin_unlock(&file->f_path.dentry->d_lock);
437 single_release(inode, file);
438 ret = -EINVAL;
439 }
440 }
441 return ret;
442}
443
444static int
445rpc_info_release(struct inode *inode, struct file *file)
446{
447 struct seq_file *m = file->private_data;
448 struct rpc_clnt *clnt = (struct rpc_clnt *)m->private;
449
450 if (clnt)
451 rpc_release_client(clnt);
452 return single_release(inode, file);
453}
454
455static const struct file_operations rpc_info_operations = {
456 .owner = THIS_MODULE,
457 .open = rpc_info_open,
458 .read = seq_read,
459 .llseek = seq_lseek,
460 .release = rpc_info_release,
461};
462
463
464
465
466
467struct rpc_filelist {
468 const char *name;
469 const struct file_operations *i_fop;
470 umode_t mode;
471};
472
473static struct inode *
474rpc_get_inode(struct super_block *sb, umode_t mode)
475{
476 struct inode *inode = new_inode(sb);
477 if (!inode)
478 return NULL;
479 inode->i_ino = get_next_ino();
480 inode->i_mode = mode;
481 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
482 switch (mode & S_IFMT) {
483 case S_IFDIR:
484 inode->i_fop = &simple_dir_operations;
485 inode->i_op = &simple_dir_inode_operations;
486 inc_nlink(inode);
487 break;
488 default:
489 break;
490 }
491 return inode;
492}
493
494static int __rpc_create_common(struct inode *dir, struct dentry *dentry,
495 umode_t mode,
496 const struct file_operations *i_fop,
497 void *private)
498{
499 struct inode *inode;
500
501 d_drop(dentry);
502 inode = rpc_get_inode(dir->i_sb, mode);
503 if (!inode)
504 goto out_err;
505 inode->i_ino = iunique(dir->i_sb, 100);
506 if (i_fop)
507 inode->i_fop = i_fop;
508 if (private)
509 rpc_inode_setowner(inode, private);
510 d_add(dentry, inode);
511 return 0;
512out_err:
513 printk(KERN_WARNING "%s: %s failed to allocate inode for dentry %pd\n",
514 __FILE__, __func__, dentry);
515 dput(dentry);
516 return -ENOMEM;
517}
518
519static int __rpc_create(struct inode *dir, struct dentry *dentry,
520 umode_t mode,
521 const struct file_operations *i_fop,
522 void *private)
523{
524 int err;
525
526 err = __rpc_create_common(dir, dentry, S_IFREG | mode, i_fop, private);
527 if (err)
528 return err;
529 fsnotify_create(dir, dentry);
530 return 0;
531}
532
533static int __rpc_mkdir(struct inode *dir, struct dentry *dentry,
534 umode_t mode,
535 const struct file_operations *i_fop,
536 void *private)
537{
538 int err;
539
540 err = __rpc_create_common(dir, dentry, S_IFDIR | mode, i_fop, private);
541 if (err)
542 return err;
543 inc_nlink(dir);
544 fsnotify_mkdir(dir, dentry);
545 return 0;
546}
547
548static void
549init_pipe(struct rpc_pipe *pipe)
550{
551 pipe->nreaders = 0;
552 pipe->nwriters = 0;
553 INIT_LIST_HEAD(&pipe->in_upcall);
554 INIT_LIST_HEAD(&pipe->in_downcall);
555 INIT_LIST_HEAD(&pipe->pipe);
556 pipe->pipelen = 0;
557 INIT_DELAYED_WORK(&pipe->queue_timeout,
558 rpc_timeout_upcall_queue);
559 pipe->ops = NULL;
560 spin_lock_init(&pipe->lock);
561 pipe->dentry = NULL;
562}
563
564void rpc_destroy_pipe_data(struct rpc_pipe *pipe)
565{
566 kfree(pipe);
567}
568EXPORT_SYMBOL_GPL(rpc_destroy_pipe_data);
569
570struct rpc_pipe *rpc_mkpipe_data(const struct rpc_pipe_ops *ops, int flags)
571{
572 struct rpc_pipe *pipe;
573
574 pipe = kzalloc(sizeof(struct rpc_pipe), GFP_KERNEL);
575 if (!pipe)
576 return ERR_PTR(-ENOMEM);
577 init_pipe(pipe);
578 pipe->ops = ops;
579 pipe->flags = flags;
580 return pipe;
581}
582EXPORT_SYMBOL_GPL(rpc_mkpipe_data);
583
584static int __rpc_mkpipe_dentry(struct inode *dir, struct dentry *dentry,
585 umode_t mode,
586 const struct file_operations *i_fop,
587 void *private,
588 struct rpc_pipe *pipe)
589{
590 struct rpc_inode *rpci;
591 int err;
592
593 err = __rpc_create_common(dir, dentry, S_IFIFO | mode, i_fop, private);
594 if (err)
595 return err;
596 rpci = RPC_I(d_inode(dentry));
597 rpci->private = private;
598 rpci->pipe = pipe;
599 fsnotify_create(dir, dentry);
600 return 0;
601}
602
603static int __rpc_rmdir(struct inode *dir, struct dentry *dentry)
604{
605 int ret;
606
607 dget(dentry);
608 ret = simple_rmdir(dir, dentry);
609 d_delete(dentry);
610 dput(dentry);
611 return ret;
612}
613
614static int __rpc_unlink(struct inode *dir, struct dentry *dentry)
615{
616 int ret;
617
618 dget(dentry);
619 ret = simple_unlink(dir, dentry);
620 d_delete(dentry);
621 dput(dentry);
622 return ret;
623}
624
625static int __rpc_rmpipe(struct inode *dir, struct dentry *dentry)
626{
627 struct inode *inode = d_inode(dentry);
628
629 rpc_close_pipes(inode);
630 return __rpc_unlink(dir, dentry);
631}
632
633static struct dentry *__rpc_lookup_create_exclusive(struct dentry *parent,
634 const char *name)
635{
636 struct qstr q = QSTR_INIT(name, strlen(name));
637 struct dentry *dentry = d_hash_and_lookup(parent, &q);
638 if (!dentry) {
639 dentry = d_alloc(parent, &q);
640 if (!dentry)
641 return ERR_PTR(-ENOMEM);
642 }
643 if (d_really_is_negative(dentry))
644 return dentry;
645 dput(dentry);
646 return ERR_PTR(-EEXIST);
647}
648
649
650
651
652static void __rpc_depopulate(struct dentry *parent,
653 const struct rpc_filelist *files,
654 int start, int eof)
655{
656 struct inode *dir = d_inode(parent);
657 struct dentry *dentry;
658 struct qstr name;
659 int i;
660
661 for (i = start; i < eof; i++) {
662 name.name = files[i].name;
663 name.len = strlen(files[i].name);
664 dentry = d_hash_and_lookup(parent, &name);
665
666 if (dentry == NULL)
667 continue;
668 if (d_really_is_negative(dentry))
669 goto next;
670 switch (d_inode(dentry)->i_mode & S_IFMT) {
671 default:
672 BUG();
673 case S_IFREG:
674 __rpc_unlink(dir, dentry);
675 break;
676 case S_IFDIR:
677 __rpc_rmdir(dir, dentry);
678 }
679next:
680 dput(dentry);
681 }
682}
683
684static void rpc_depopulate(struct dentry *parent,
685 const struct rpc_filelist *files,
686 int start, int eof)
687{
688 struct inode *dir = d_inode(parent);
689
690 inode_lock_nested(dir, I_MUTEX_CHILD);
691 __rpc_depopulate(parent, files, start, eof);
692 inode_unlock(dir);
693}
694
695static int rpc_populate(struct dentry *parent,
696 const struct rpc_filelist *files,
697 int start, int eof,
698 void *private)
699{
700 struct inode *dir = d_inode(parent);
701 struct dentry *dentry;
702 int i, err;
703
704 inode_lock(dir);
705 for (i = start; i < eof; i++) {
706 dentry = __rpc_lookup_create_exclusive(parent, files[i].name);
707 err = PTR_ERR(dentry);
708 if (IS_ERR(dentry))
709 goto out_bad;
710 switch (files[i].mode & S_IFMT) {
711 default:
712 BUG();
713 case S_IFREG:
714 err = __rpc_create(dir, dentry,
715 files[i].mode,
716 files[i].i_fop,
717 private);
718 break;
719 case S_IFDIR:
720 err = __rpc_mkdir(dir, dentry,
721 files[i].mode,
722 NULL,
723 private);
724 }
725 if (err != 0)
726 goto out_bad;
727 }
728 inode_unlock(dir);
729 return 0;
730out_bad:
731 __rpc_depopulate(parent, files, start, eof);
732 inode_unlock(dir);
733 printk(KERN_WARNING "%s: %s failed to populate directory %pd\n",
734 __FILE__, __func__, parent);
735 return err;
736}
737
738static struct dentry *rpc_mkdir_populate(struct dentry *parent,
739 const char *name, umode_t mode, void *private,
740 int (*populate)(struct dentry *, void *), void *args_populate)
741{
742 struct dentry *dentry;
743 struct inode *dir = d_inode(parent);
744 int error;
745
746 inode_lock_nested(dir, I_MUTEX_PARENT);
747 dentry = __rpc_lookup_create_exclusive(parent, name);
748 if (IS_ERR(dentry))
749 goto out;
750 error = __rpc_mkdir(dir, dentry, mode, NULL, private);
751 if (error != 0)
752 goto out_err;
753 if (populate != NULL) {
754 error = populate(dentry, args_populate);
755 if (error)
756 goto err_rmdir;
757 }
758out:
759 inode_unlock(dir);
760 return dentry;
761err_rmdir:
762 __rpc_rmdir(dir, dentry);
763out_err:
764 dentry = ERR_PTR(error);
765 goto out;
766}
767
768static int rpc_rmdir_depopulate(struct dentry *dentry,
769 void (*depopulate)(struct dentry *))
770{
771 struct dentry *parent;
772 struct inode *dir;
773 int error;
774
775 parent = dget_parent(dentry);
776 dir = d_inode(parent);
777 inode_lock_nested(dir, I_MUTEX_PARENT);
778 if (depopulate != NULL)
779 depopulate(dentry);
780 error = __rpc_rmdir(dir, dentry);
781 inode_unlock(dir);
782 dput(parent);
783 return error;
784}
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804struct dentry *rpc_mkpipe_dentry(struct dentry *parent, const char *name,
805 void *private, struct rpc_pipe *pipe)
806{
807 struct dentry *dentry;
808 struct inode *dir = d_inode(parent);
809 umode_t umode = S_IFIFO | 0600;
810 int err;
811
812 if (pipe->ops->upcall == NULL)
813 umode &= ~0444;
814 if (pipe->ops->downcall == NULL)
815 umode &= ~0222;
816
817 inode_lock_nested(dir, I_MUTEX_PARENT);
818 dentry = __rpc_lookup_create_exclusive(parent, name);
819 if (IS_ERR(dentry))
820 goto out;
821 err = __rpc_mkpipe_dentry(dir, dentry, umode, &rpc_pipe_fops,
822 private, pipe);
823 if (err)
824 goto out_err;
825out:
826 inode_unlock(dir);
827 return dentry;
828out_err:
829 dentry = ERR_PTR(err);
830 printk(KERN_WARNING "%s: %s() failed to create pipe %pd/%s (errno = %d)\n",
831 __FILE__, __func__, parent, name,
832 err);
833 goto out;
834}
835EXPORT_SYMBOL_GPL(rpc_mkpipe_dentry);
836
837
838
839
840
841
842
843
844
845int
846rpc_unlink(struct dentry *dentry)
847{
848 struct dentry *parent;
849 struct inode *dir;
850 int error = 0;
851
852 parent = dget_parent(dentry);
853 dir = d_inode(parent);
854 inode_lock_nested(dir, I_MUTEX_PARENT);
855 error = __rpc_rmpipe(dir, dentry);
856 inode_unlock(dir);
857 dput(parent);
858 return error;
859}
860EXPORT_SYMBOL_GPL(rpc_unlink);
861
862
863
864
865
866void rpc_init_pipe_dir_head(struct rpc_pipe_dir_head *pdh)
867{
868 INIT_LIST_HEAD(&pdh->pdh_entries);
869 pdh->pdh_dentry = NULL;
870}
871EXPORT_SYMBOL_GPL(rpc_init_pipe_dir_head);
872
873
874
875
876
877
878
879void rpc_init_pipe_dir_object(struct rpc_pipe_dir_object *pdo,
880 const struct rpc_pipe_dir_object_ops *pdo_ops,
881 void *pdo_data)
882{
883 INIT_LIST_HEAD(&pdo->pdo_head);
884 pdo->pdo_ops = pdo_ops;
885 pdo->pdo_data = pdo_data;
886}
887EXPORT_SYMBOL_GPL(rpc_init_pipe_dir_object);
888
889static int
890rpc_add_pipe_dir_object_locked(struct net *net,
891 struct rpc_pipe_dir_head *pdh,
892 struct rpc_pipe_dir_object *pdo)
893{
894 int ret = 0;
895
896 if (pdh->pdh_dentry)
897 ret = pdo->pdo_ops->create(pdh->pdh_dentry, pdo);
898 if (ret == 0)
899 list_add_tail(&pdo->pdo_head, &pdh->pdh_entries);
900 return ret;
901}
902
903static void
904rpc_remove_pipe_dir_object_locked(struct net *net,
905 struct rpc_pipe_dir_head *pdh,
906 struct rpc_pipe_dir_object *pdo)
907{
908 if (pdh->pdh_dentry)
909 pdo->pdo_ops->destroy(pdh->pdh_dentry, pdo);
910 list_del_init(&pdo->pdo_head);
911}
912
913
914
915
916
917
918
919
920int
921rpc_add_pipe_dir_object(struct net *net,
922 struct rpc_pipe_dir_head *pdh,
923 struct rpc_pipe_dir_object *pdo)
924{
925 int ret = 0;
926
927 if (list_empty(&pdo->pdo_head)) {
928 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
929
930 mutex_lock(&sn->pipefs_sb_lock);
931 ret = rpc_add_pipe_dir_object_locked(net, pdh, pdo);
932 mutex_unlock(&sn->pipefs_sb_lock);
933 }
934 return ret;
935}
936EXPORT_SYMBOL_GPL(rpc_add_pipe_dir_object);
937
938
939
940
941
942
943
944
945void
946rpc_remove_pipe_dir_object(struct net *net,
947 struct rpc_pipe_dir_head *pdh,
948 struct rpc_pipe_dir_object *pdo)
949{
950 if (!list_empty(&pdo->pdo_head)) {
951 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
952
953 mutex_lock(&sn->pipefs_sb_lock);
954 rpc_remove_pipe_dir_object_locked(net, pdh, pdo);
955 mutex_unlock(&sn->pipefs_sb_lock);
956 }
957}
958EXPORT_SYMBOL_GPL(rpc_remove_pipe_dir_object);
959
960
961
962
963
964
965
966
967
968
969struct rpc_pipe_dir_object *
970rpc_find_or_alloc_pipe_dir_object(struct net *net,
971 struct rpc_pipe_dir_head *pdh,
972 int (*match)(struct rpc_pipe_dir_object *, void *),
973 struct rpc_pipe_dir_object *(*alloc)(void *),
974 void *data)
975{
976 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
977 struct rpc_pipe_dir_object *pdo;
978
979 mutex_lock(&sn->pipefs_sb_lock);
980 list_for_each_entry(pdo, &pdh->pdh_entries, pdo_head) {
981 if (!match(pdo, data))
982 continue;
983 goto out;
984 }
985 pdo = alloc(data);
986 if (!pdo)
987 goto out;
988 rpc_add_pipe_dir_object_locked(net, pdh, pdo);
989out:
990 mutex_unlock(&sn->pipefs_sb_lock);
991 return pdo;
992}
993EXPORT_SYMBOL_GPL(rpc_find_or_alloc_pipe_dir_object);
994
995static void
996rpc_create_pipe_dir_objects(struct rpc_pipe_dir_head *pdh)
997{
998 struct rpc_pipe_dir_object *pdo;
999 struct dentry *dir = pdh->pdh_dentry;
1000
1001 list_for_each_entry(pdo, &pdh->pdh_entries, pdo_head)
1002 pdo->pdo_ops->create(dir, pdo);
1003}
1004
1005static void
1006rpc_destroy_pipe_dir_objects(struct rpc_pipe_dir_head *pdh)
1007{
1008 struct rpc_pipe_dir_object *pdo;
1009 struct dentry *dir = pdh->pdh_dentry;
1010
1011 list_for_each_entry(pdo, &pdh->pdh_entries, pdo_head)
1012 pdo->pdo_ops->destroy(dir, pdo);
1013}
1014
1015enum {
1016 RPCAUTH_info,
1017 RPCAUTH_EOF
1018};
1019
1020static const struct rpc_filelist authfiles[] = {
1021 [RPCAUTH_info] = {
1022 .name = "info",
1023 .i_fop = &rpc_info_operations,
1024 .mode = S_IFREG | 0400,
1025 },
1026};
1027
1028static int rpc_clntdir_populate(struct dentry *dentry, void *private)
1029{
1030 return rpc_populate(dentry,
1031 authfiles, RPCAUTH_info, RPCAUTH_EOF,
1032 private);
1033}
1034
1035static void rpc_clntdir_depopulate(struct dentry *dentry)
1036{
1037 rpc_depopulate(dentry, authfiles, RPCAUTH_info, RPCAUTH_EOF);
1038}
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051struct dentry *rpc_create_client_dir(struct dentry *dentry,
1052 const char *name,
1053 struct rpc_clnt *rpc_client)
1054{
1055 struct dentry *ret;
1056
1057 ret = rpc_mkdir_populate(dentry, name, 0555, NULL,
1058 rpc_clntdir_populate, rpc_client);
1059 if (!IS_ERR(ret)) {
1060 rpc_client->cl_pipedir_objects.pdh_dentry = ret;
1061 rpc_create_pipe_dir_objects(&rpc_client->cl_pipedir_objects);
1062 }
1063 return ret;
1064}
1065
1066
1067
1068
1069
1070int rpc_remove_client_dir(struct rpc_clnt *rpc_client)
1071{
1072 struct dentry *dentry = rpc_client->cl_pipedir_objects.pdh_dentry;
1073
1074 if (dentry == NULL)
1075 return 0;
1076 rpc_destroy_pipe_dir_objects(&rpc_client->cl_pipedir_objects);
1077 rpc_client->cl_pipedir_objects.pdh_dentry = NULL;
1078 return rpc_rmdir_depopulate(dentry, rpc_clntdir_depopulate);
1079}
1080
1081static const struct rpc_filelist cache_pipefs_files[3] = {
1082 [0] = {
1083 .name = "channel",
1084 .i_fop = &cache_file_operations_pipefs,
1085 .mode = S_IFREG | 0600,
1086 },
1087 [1] = {
1088 .name = "content",
1089 .i_fop = &content_file_operations_pipefs,
1090 .mode = S_IFREG | 0400,
1091 },
1092 [2] = {
1093 .name = "flush",
1094 .i_fop = &cache_flush_operations_pipefs,
1095 .mode = S_IFREG | 0600,
1096 },
1097};
1098
1099static int rpc_cachedir_populate(struct dentry *dentry, void *private)
1100{
1101 return rpc_populate(dentry,
1102 cache_pipefs_files, 0, 3,
1103 private);
1104}
1105
1106static void rpc_cachedir_depopulate(struct dentry *dentry)
1107{
1108 rpc_depopulate(dentry, cache_pipefs_files, 0, 3);
1109}
1110
1111struct dentry *rpc_create_cache_dir(struct dentry *parent, const char *name,
1112 umode_t umode, struct cache_detail *cd)
1113{
1114 return rpc_mkdir_populate(parent, name, umode, NULL,
1115 rpc_cachedir_populate, cd);
1116}
1117
1118void rpc_remove_cache_dir(struct dentry *dentry)
1119{
1120 rpc_rmdir_depopulate(dentry, rpc_cachedir_depopulate);
1121}
1122
1123
1124
1125
1126static const struct super_operations s_ops = {
1127 .alloc_inode = rpc_alloc_inode,
1128 .destroy_inode = rpc_destroy_inode,
1129 .statfs = simple_statfs,
1130};
1131
1132#define RPCAUTH_GSSMAGIC 0x67596969
1133
1134
1135
1136
1137enum {
1138 RPCAUTH_lockd,
1139 RPCAUTH_mount,
1140 RPCAUTH_nfs,
1141 RPCAUTH_portmap,
1142 RPCAUTH_statd,
1143 RPCAUTH_nfsd4_cb,
1144 RPCAUTH_cache,
1145 RPCAUTH_nfsd,
1146 RPCAUTH_gssd,
1147 RPCAUTH_RootEOF
1148};
1149
1150static const struct rpc_filelist files[] = {
1151 [RPCAUTH_lockd] = {
1152 .name = "lockd",
1153 .mode = S_IFDIR | 0555,
1154 },
1155 [RPCAUTH_mount] = {
1156 .name = "mount",
1157 .mode = S_IFDIR | 0555,
1158 },
1159 [RPCAUTH_nfs] = {
1160 .name = "nfs",
1161 .mode = S_IFDIR | 0555,
1162 },
1163 [RPCAUTH_portmap] = {
1164 .name = "portmap",
1165 .mode = S_IFDIR | 0555,
1166 },
1167 [RPCAUTH_statd] = {
1168 .name = "statd",
1169 .mode = S_IFDIR | 0555,
1170 },
1171 [RPCAUTH_nfsd4_cb] = {
1172 .name = "nfsd4_cb",
1173 .mode = S_IFDIR | 0555,
1174 },
1175 [RPCAUTH_cache] = {
1176 .name = "cache",
1177 .mode = S_IFDIR | 0555,
1178 },
1179 [RPCAUTH_nfsd] = {
1180 .name = "nfsd",
1181 .mode = S_IFDIR | 0555,
1182 },
1183 [RPCAUTH_gssd] = {
1184 .name = "gssd",
1185 .mode = S_IFDIR | 0555,
1186 },
1187};
1188
1189
1190
1191
1192struct dentry *rpc_d_lookup_sb(const struct super_block *sb,
1193 const unsigned char *dir_name)
1194{
1195 struct qstr dir = QSTR_INIT(dir_name, strlen(dir_name));
1196 return d_hash_and_lookup(sb->s_root, &dir);
1197}
1198EXPORT_SYMBOL_GPL(rpc_d_lookup_sb);
1199
1200int rpc_pipefs_init_net(struct net *net)
1201{
1202 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1203
1204 sn->gssd_dummy = rpc_mkpipe_data(&gssd_dummy_pipe_ops, 0);
1205 if (IS_ERR(sn->gssd_dummy))
1206 return PTR_ERR(sn->gssd_dummy);
1207
1208 mutex_init(&sn->pipefs_sb_lock);
1209 sn->pipe_version = -1;
1210 return 0;
1211}
1212
1213void rpc_pipefs_exit_net(struct net *net)
1214{
1215 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1216
1217 rpc_destroy_pipe_data(sn->gssd_dummy);
1218}
1219
1220
1221
1222
1223
1224
1225
1226struct super_block *rpc_get_sb_net(const struct net *net)
1227{
1228 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1229
1230 mutex_lock(&sn->pipefs_sb_lock);
1231 if (sn->pipefs_sb)
1232 return sn->pipefs_sb;
1233 mutex_unlock(&sn->pipefs_sb_lock);
1234 return NULL;
1235}
1236EXPORT_SYMBOL_GPL(rpc_get_sb_net);
1237
1238void rpc_put_sb_net(const struct net *net)
1239{
1240 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1241
1242 WARN_ON(sn->pipefs_sb == NULL);
1243 mutex_unlock(&sn->pipefs_sb_lock);
1244}
1245EXPORT_SYMBOL_GPL(rpc_put_sb_net);
1246
1247static const struct rpc_filelist gssd_dummy_clnt_dir[] = {
1248 [0] = {
1249 .name = "clntXX",
1250 .mode = S_IFDIR | 0555,
1251 },
1252};
1253
1254static ssize_t
1255dummy_downcall(struct file *filp, const char __user *src, size_t len)
1256{
1257 return -EINVAL;
1258}
1259
1260static const struct rpc_pipe_ops gssd_dummy_pipe_ops = {
1261 .upcall = rpc_pipe_generic_upcall,
1262 .downcall = dummy_downcall,
1263};
1264
1265
1266
1267
1268
1269
1270static int
1271rpc_dummy_info_show(struct seq_file *m, void *v)
1272{
1273 seq_printf(m, "RPC server: %s\n", utsname()->nodename);
1274 seq_printf(m, "service: foo (1) version 0\n");
1275 seq_printf(m, "address: 127.0.0.1\n");
1276 seq_printf(m, "protocol: tcp\n");
1277 seq_printf(m, "port: 0\n");
1278 return 0;
1279}
1280DEFINE_SHOW_ATTRIBUTE(rpc_dummy_info);
1281
1282static const struct rpc_filelist gssd_dummy_info_file[] = {
1283 [0] = {
1284 .name = "info",
1285 .i_fop = &rpc_dummy_info_fops,
1286 .mode = S_IFREG | 0400,
1287 },
1288};
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298static struct dentry *
1299rpc_gssd_dummy_populate(struct dentry *root, struct rpc_pipe *pipe_data)
1300{
1301 int ret = 0;
1302 struct dentry *gssd_dentry;
1303 struct dentry *clnt_dentry = NULL;
1304 struct dentry *pipe_dentry = NULL;
1305 struct qstr q = QSTR_INIT(files[RPCAUTH_gssd].name,
1306 strlen(files[RPCAUTH_gssd].name));
1307
1308
1309 gssd_dentry = d_hash_and_lookup(root, &q);
1310 if (!gssd_dentry)
1311 return ERR_PTR(-ENOENT);
1312
1313 ret = rpc_populate(gssd_dentry, gssd_dummy_clnt_dir, 0, 1, NULL);
1314 if (ret) {
1315 pipe_dentry = ERR_PTR(ret);
1316 goto out;
1317 }
1318
1319 q.name = gssd_dummy_clnt_dir[0].name;
1320 q.len = strlen(gssd_dummy_clnt_dir[0].name);
1321 clnt_dentry = d_hash_and_lookup(gssd_dentry, &q);
1322 if (!clnt_dentry) {
1323 __rpc_depopulate(gssd_dentry, gssd_dummy_clnt_dir, 0, 1);
1324 pipe_dentry = ERR_PTR(-ENOENT);
1325 goto out;
1326 }
1327
1328 ret = rpc_populate(clnt_dentry, gssd_dummy_info_file, 0, 1, NULL);
1329 if (ret) {
1330 __rpc_depopulate(gssd_dentry, gssd_dummy_clnt_dir, 0, 1);
1331 pipe_dentry = ERR_PTR(ret);
1332 goto out;
1333 }
1334
1335 pipe_dentry = rpc_mkpipe_dentry(clnt_dentry, "gssd", NULL, pipe_data);
1336 if (IS_ERR(pipe_dentry)) {
1337 __rpc_depopulate(clnt_dentry, gssd_dummy_info_file, 0, 1);
1338 __rpc_depopulate(gssd_dentry, gssd_dummy_clnt_dir, 0, 1);
1339 }
1340out:
1341 dput(clnt_dentry);
1342 dput(gssd_dentry);
1343 return pipe_dentry;
1344}
1345
1346static void
1347rpc_gssd_dummy_depopulate(struct dentry *pipe_dentry)
1348{
1349 struct dentry *clnt_dir = pipe_dentry->d_parent;
1350 struct dentry *gssd_dir = clnt_dir->d_parent;
1351
1352 dget(pipe_dentry);
1353 __rpc_rmpipe(d_inode(clnt_dir), pipe_dentry);
1354 __rpc_depopulate(clnt_dir, gssd_dummy_info_file, 0, 1);
1355 __rpc_depopulate(gssd_dir, gssd_dummy_clnt_dir, 0, 1);
1356 dput(pipe_dentry);
1357}
1358
1359static int
1360rpc_fill_super(struct super_block *sb, struct fs_context *fc)
1361{
1362 struct inode *inode;
1363 struct dentry *root, *gssd_dentry;
1364 struct net *net = sb->s_fs_info;
1365 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1366 int err;
1367
1368 sb->s_blocksize = PAGE_SIZE;
1369 sb->s_blocksize_bits = PAGE_SHIFT;
1370 sb->s_magic = RPCAUTH_GSSMAGIC;
1371 sb->s_op = &s_ops;
1372 sb->s_d_op = &simple_dentry_operations;
1373 sb->s_time_gran = 1;
1374
1375 inode = rpc_get_inode(sb, S_IFDIR | 0555);
1376 sb->s_root = root = d_make_root(inode);
1377 if (!root)
1378 return -ENOMEM;
1379 if (rpc_populate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF, NULL))
1380 return -ENOMEM;
1381
1382 gssd_dentry = rpc_gssd_dummy_populate(root, sn->gssd_dummy);
1383 if (IS_ERR(gssd_dentry)) {
1384 __rpc_depopulate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF);
1385 return PTR_ERR(gssd_dentry);
1386 }
1387
1388 dprintk("RPC: sending pipefs MOUNT notification for net %x%s\n",
1389 net->ns.inum, NET_NAME(net));
1390 mutex_lock(&sn->pipefs_sb_lock);
1391 sn->pipefs_sb = sb;
1392 err = blocking_notifier_call_chain(&rpc_pipefs_notifier_list,
1393 RPC_PIPEFS_MOUNT,
1394 sb);
1395 if (err)
1396 goto err_depopulate;
1397 mutex_unlock(&sn->pipefs_sb_lock);
1398 return 0;
1399
1400err_depopulate:
1401 rpc_gssd_dummy_depopulate(gssd_dentry);
1402 blocking_notifier_call_chain(&rpc_pipefs_notifier_list,
1403 RPC_PIPEFS_UMOUNT,
1404 sb);
1405 sn->pipefs_sb = NULL;
1406 __rpc_depopulate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF);
1407 mutex_unlock(&sn->pipefs_sb_lock);
1408 return err;
1409}
1410
1411bool
1412gssd_running(struct net *net)
1413{
1414 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1415 struct rpc_pipe *pipe = sn->gssd_dummy;
1416
1417 return pipe->nreaders || pipe->nwriters;
1418}
1419EXPORT_SYMBOL_GPL(gssd_running);
1420
1421static int rpc_fs_get_tree(struct fs_context *fc)
1422{
1423 return get_tree_keyed(fc, rpc_fill_super, get_net(fc->net_ns));
1424}
1425
1426static void rpc_fs_free_fc(struct fs_context *fc)
1427{
1428 if (fc->s_fs_info)
1429 put_net(fc->s_fs_info);
1430}
1431
1432static const struct fs_context_operations rpc_fs_context_ops = {
1433 .free = rpc_fs_free_fc,
1434 .get_tree = rpc_fs_get_tree,
1435};
1436
1437static int rpc_init_fs_context(struct fs_context *fc)
1438{
1439 put_user_ns(fc->user_ns);
1440 fc->user_ns = get_user_ns(fc->net_ns->user_ns);
1441 fc->ops = &rpc_fs_context_ops;
1442 return 0;
1443}
1444
1445static void rpc_kill_sb(struct super_block *sb)
1446{
1447 struct net *net = sb->s_fs_info;
1448 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1449
1450 mutex_lock(&sn->pipefs_sb_lock);
1451 if (sn->pipefs_sb != sb) {
1452 mutex_unlock(&sn->pipefs_sb_lock);
1453 goto out;
1454 }
1455 sn->pipefs_sb = NULL;
1456 dprintk("RPC: sending pipefs UMOUNT notification for net %x%s\n",
1457 net->ns.inum, NET_NAME(net));
1458 blocking_notifier_call_chain(&rpc_pipefs_notifier_list,
1459 RPC_PIPEFS_UMOUNT,
1460 sb);
1461 mutex_unlock(&sn->pipefs_sb_lock);
1462out:
1463 kill_litter_super(sb);
1464 put_net(net);
1465}
1466
1467static struct file_system_type rpc_pipe_fs_type = {
1468 .owner = THIS_MODULE,
1469 .name = "rpc_pipefs",
1470 .init_fs_context = rpc_init_fs_context,
1471 .kill_sb = rpc_kill_sb,
1472};
1473MODULE_ALIAS_FS("rpc_pipefs");
1474MODULE_ALIAS("rpc_pipefs");
1475
1476static void
1477init_once(void *foo)
1478{
1479 struct rpc_inode *rpci = (struct rpc_inode *) foo;
1480
1481 inode_init_once(&rpci->vfs_inode);
1482 rpci->private = NULL;
1483 rpci->pipe = NULL;
1484 init_waitqueue_head(&rpci->waitq);
1485}
1486
1487int register_rpc_pipefs(void)
1488{
1489 int err;
1490
1491 rpc_inode_cachep = kmem_cache_create("rpc_inode_cache",
1492 sizeof(struct rpc_inode),
1493 0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1494 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
1495 init_once);
1496 if (!rpc_inode_cachep)
1497 return -ENOMEM;
1498 err = rpc_clients_notifier_register();
1499 if (err)
1500 goto err_notifier;
1501 err = register_filesystem(&rpc_pipe_fs_type);
1502 if (err)
1503 goto err_register;
1504 return 0;
1505
1506err_register:
1507 rpc_clients_notifier_unregister();
1508err_notifier:
1509 kmem_cache_destroy(rpc_inode_cachep);
1510 return err;
1511}
1512
1513void unregister_rpc_pipefs(void)
1514{
1515 rpc_clients_notifier_unregister();
1516 unregister_filesystem(&rpc_pipe_fs_type);
1517 kmem_cache_destroy(rpc_inode_cachep);
1518}
1519