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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 | |
d51fe1be | 6 | * and fs/sysfs/inode.c |
1da177e4 LT |
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 | ||
ba89966c | 31 | static struct vfsmount *rpc_mount __read_mostly; |
1da177e4 LT |
32 | static int rpc_mount_count; |
33 | ||
34 | static struct file_system_type rpc_pipe_fs_type; | |
35 | ||
36 | ||
ba89966c | 37 | static kmem_cache_t *rpc_inode_cachep __read_mostly; |
1da177e4 LT |
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); | |
6070fe6f | 79 | int res = -EPIPE; |
1da177e4 LT |
80 | |
81 | down(&inode->i_sem); | |
6070fe6f TM |
82 | if (rpci->ops == NULL) |
83 | goto out; | |
1da177e4 LT |
84 | if (rpci->nreaders) { |
85 | list_add_tail(&msg->list, &rpci->pipe); | |
86 | rpci->pipelen += msg->len; | |
6070fe6f | 87 | res = 0; |
1da177e4 LT |
88 | } else if (rpci->flags & RPC_PIPE_WAIT_FOR_OPEN) { |
89 | if (list_empty(&rpci->pipe)) | |
90 | schedule_delayed_work(&rpci->queue_timeout, | |
91 | RPC_UPCALL_TIMEOUT); | |
92 | list_add_tail(&msg->list, &rpci->pipe); | |
93 | rpci->pipelen += msg->len; | |
6070fe6f TM |
94 | res = 0; |
95 | } | |
96 | out: | |
1da177e4 LT |
97 | up(&inode->i_sem); |
98 | wake_up(&rpci->waitq); | |
99 | return res; | |
100 | } | |
101 | ||
6070fe6f TM |
102 | static inline void |
103 | rpc_inode_setowner(struct inode *inode, void *private) | |
104 | { | |
105 | RPC_I(inode)->private = private; | |
106 | } | |
107 | ||
1da177e4 LT |
108 | static void |
109 | rpc_close_pipes(struct inode *inode) | |
110 | { | |
111 | struct rpc_inode *rpci = RPC_I(inode); | |
112 | ||
113 | cancel_delayed_work(&rpci->queue_timeout); | |
114 | flush_scheduled_work(); | |
115 | down(&inode->i_sem); | |
116 | if (rpci->ops != NULL) { | |
117 | rpci->nreaders = 0; | |
118 | __rpc_purge_upcall(inode, -EPIPE); | |
119 | rpci->nwriters = 0; | |
120 | if (rpci->ops->release_pipe) | |
121 | rpci->ops->release_pipe(inode); | |
122 | rpci->ops = NULL; | |
123 | } | |
6070fe6f | 124 | rpc_inode_setowner(inode, NULL); |
1da177e4 LT |
125 | up(&inode->i_sem); |
126 | } | |
127 | ||
1da177e4 LT |
128 | static struct inode * |
129 | rpc_alloc_inode(struct super_block *sb) | |
130 | { | |
131 | struct rpc_inode *rpci; | |
132 | rpci = (struct rpc_inode *)kmem_cache_alloc(rpc_inode_cachep, SLAB_KERNEL); | |
133 | if (!rpci) | |
134 | return NULL; | |
135 | return &rpci->vfs_inode; | |
136 | } | |
137 | ||
138 | static void | |
139 | rpc_destroy_inode(struct inode *inode) | |
140 | { | |
141 | kmem_cache_free(rpc_inode_cachep, RPC_I(inode)); | |
142 | } | |
143 | ||
144 | static int | |
145 | rpc_pipe_open(struct inode *inode, struct file *filp) | |
146 | { | |
147 | struct rpc_inode *rpci = RPC_I(inode); | |
148 | int res = -ENXIO; | |
149 | ||
150 | down(&inode->i_sem); | |
151 | if (rpci->ops != NULL) { | |
152 | if (filp->f_mode & FMODE_READ) | |
153 | rpci->nreaders ++; | |
154 | if (filp->f_mode & FMODE_WRITE) | |
155 | rpci->nwriters ++; | |
156 | res = 0; | |
157 | } | |
158 | up(&inode->i_sem); | |
159 | return res; | |
160 | } | |
161 | ||
162 | static int | |
163 | rpc_pipe_release(struct inode *inode, struct file *filp) | |
164 | { | |
165 | struct rpc_inode *rpci = RPC_I(filp->f_dentry->d_inode); | |
166 | struct rpc_pipe_msg *msg; | |
167 | ||
168 | down(&inode->i_sem); | |
169 | if (rpci->ops == NULL) | |
170 | goto out; | |
171 | msg = (struct rpc_pipe_msg *)filp->private_data; | |
172 | if (msg != NULL) { | |
173 | msg->errno = -EPIPE; | |
174 | list_del_init(&msg->list); | |
175 | rpci->ops->destroy_msg(msg); | |
176 | } | |
177 | if (filp->f_mode & FMODE_WRITE) | |
178 | rpci->nwriters --; | |
179 | if (filp->f_mode & FMODE_READ) | |
180 | rpci->nreaders --; | |
181 | if (!rpci->nreaders) | |
182 | __rpc_purge_upcall(inode, -EPIPE); | |
183 | if (rpci->ops->release_pipe) | |
184 | rpci->ops->release_pipe(inode); | |
185 | out: | |
186 | up(&inode->i_sem); | |
187 | return 0; | |
188 | } | |
189 | ||
190 | static ssize_t | |
191 | rpc_pipe_read(struct file *filp, char __user *buf, size_t len, loff_t *offset) | |
192 | { | |
193 | struct inode *inode = filp->f_dentry->d_inode; | |
194 | struct rpc_inode *rpci = RPC_I(inode); | |
195 | struct rpc_pipe_msg *msg; | |
196 | int res = 0; | |
197 | ||
198 | down(&inode->i_sem); | |
199 | if (rpci->ops == NULL) { | |
200 | res = -EPIPE; | |
201 | goto out_unlock; | |
202 | } | |
203 | msg = filp->private_data; | |
204 | if (msg == NULL) { | |
205 | if (!list_empty(&rpci->pipe)) { | |
206 | msg = list_entry(rpci->pipe.next, | |
207 | struct rpc_pipe_msg, | |
208 | list); | |
209 | list_move(&msg->list, &rpci->in_upcall); | |
210 | rpci->pipelen -= msg->len; | |
211 | filp->private_data = msg; | |
212 | msg->copied = 0; | |
213 | } | |
214 | if (msg == NULL) | |
215 | goto out_unlock; | |
216 | } | |
217 | /* NOTE: it is up to the callback to update msg->copied */ | |
218 | res = rpci->ops->upcall(filp, msg, buf, len); | |
219 | if (res < 0 || msg->len == msg->copied) { | |
220 | filp->private_data = NULL; | |
221 | list_del_init(&msg->list); | |
222 | rpci->ops->destroy_msg(msg); | |
223 | } | |
224 | out_unlock: | |
225 | up(&inode->i_sem); | |
226 | return res; | |
227 | } | |
228 | ||
229 | static ssize_t | |
230 | rpc_pipe_write(struct file *filp, const char __user *buf, size_t len, loff_t *offset) | |
231 | { | |
232 | struct inode *inode = filp->f_dentry->d_inode; | |
233 | struct rpc_inode *rpci = RPC_I(inode); | |
234 | int res; | |
235 | ||
236 | down(&inode->i_sem); | |
237 | res = -EPIPE; | |
238 | if (rpci->ops != NULL) | |
239 | res = rpci->ops->downcall(filp, buf, len); | |
240 | up(&inode->i_sem); | |
241 | return res; | |
242 | } | |
243 | ||
244 | static unsigned int | |
245 | rpc_pipe_poll(struct file *filp, struct poll_table_struct *wait) | |
246 | { | |
247 | struct rpc_inode *rpci; | |
248 | unsigned int mask = 0; | |
249 | ||
250 | rpci = RPC_I(filp->f_dentry->d_inode); | |
251 | poll_wait(filp, &rpci->waitq, wait); | |
252 | ||
253 | mask = POLLOUT | POLLWRNORM; | |
254 | if (rpci->ops == NULL) | |
255 | mask |= POLLERR | POLLHUP; | |
256 | if (!list_empty(&rpci->pipe)) | |
257 | mask |= POLLIN | POLLRDNORM; | |
258 | return mask; | |
259 | } | |
260 | ||
261 | static int | |
262 | rpc_pipe_ioctl(struct inode *ino, struct file *filp, | |
263 | unsigned int cmd, unsigned long arg) | |
264 | { | |
265 | struct rpc_inode *rpci = RPC_I(filp->f_dentry->d_inode); | |
266 | int len; | |
267 | ||
268 | switch (cmd) { | |
269 | case FIONREAD: | |
270 | if (rpci->ops == NULL) | |
271 | return -EPIPE; | |
272 | len = rpci->pipelen; | |
273 | if (filp->private_data) { | |
274 | struct rpc_pipe_msg *msg; | |
275 | msg = (struct rpc_pipe_msg *)filp->private_data; | |
276 | len += msg->len - msg->copied; | |
277 | } | |
278 | return put_user(len, (int __user *)arg); | |
279 | default: | |
280 | return -EINVAL; | |
281 | } | |
282 | } | |
283 | ||
284 | static struct file_operations rpc_pipe_fops = { | |
285 | .owner = THIS_MODULE, | |
286 | .llseek = no_llseek, | |
287 | .read = rpc_pipe_read, | |
288 | .write = rpc_pipe_write, | |
289 | .poll = rpc_pipe_poll, | |
290 | .ioctl = rpc_pipe_ioctl, | |
291 | .open = rpc_pipe_open, | |
292 | .release = rpc_pipe_release, | |
293 | }; | |
294 | ||
295 | static int | |
296 | rpc_show_info(struct seq_file *m, void *v) | |
297 | { | |
298 | struct rpc_clnt *clnt = m->private; | |
299 | ||
300 | seq_printf(m, "RPC server: %s\n", clnt->cl_server); | |
301 | seq_printf(m, "service: %s (%d) version %d\n", clnt->cl_protname, | |
302 | clnt->cl_prog, clnt->cl_vers); | |
303 | seq_printf(m, "address: %u.%u.%u.%u\n", | |
304 | NIPQUAD(clnt->cl_xprt->addr.sin_addr.s_addr)); | |
305 | seq_printf(m, "protocol: %s\n", | |
306 | clnt->cl_xprt->prot == IPPROTO_UDP ? "udp" : "tcp"); | |
307 | return 0; | |
308 | } | |
309 | ||
310 | static int | |
311 | rpc_info_open(struct inode *inode, struct file *file) | |
312 | { | |
313 | struct rpc_clnt *clnt; | |
314 | int ret = single_open(file, rpc_show_info, NULL); | |
315 | ||
316 | if (!ret) { | |
317 | struct seq_file *m = file->private_data; | |
318 | down(&inode->i_sem); | |
319 | clnt = RPC_I(inode)->private; | |
320 | if (clnt) { | |
321 | atomic_inc(&clnt->cl_users); | |
322 | m->private = clnt; | |
323 | } else { | |
324 | single_release(inode, file); | |
325 | ret = -EINVAL; | |
326 | } | |
327 | up(&inode->i_sem); | |
328 | } | |
329 | return ret; | |
330 | } | |
331 | ||
332 | static int | |
333 | rpc_info_release(struct inode *inode, struct file *file) | |
334 | { | |
335 | struct seq_file *m = file->private_data; | |
336 | struct rpc_clnt *clnt = (struct rpc_clnt *)m->private; | |
337 | ||
338 | if (clnt) | |
339 | rpc_release_client(clnt); | |
340 | return single_release(inode, file); | |
341 | } | |
342 | ||
343 | static struct file_operations rpc_info_operations = { | |
344 | .owner = THIS_MODULE, | |
345 | .open = rpc_info_open, | |
346 | .read = seq_read, | |
347 | .llseek = seq_lseek, | |
348 | .release = rpc_info_release, | |
349 | }; | |
350 | ||
351 | ||
352 | /* | |
353 | * We have a single directory with 1 node in it. | |
354 | */ | |
355 | enum { | |
356 | RPCAUTH_Root = 1, | |
357 | RPCAUTH_lockd, | |
358 | RPCAUTH_mount, | |
359 | RPCAUTH_nfs, | |
360 | RPCAUTH_portmap, | |
361 | RPCAUTH_statd, | |
362 | RPCAUTH_RootEOF | |
363 | }; | |
364 | ||
365 | /* | |
366 | * Description of fs contents. | |
367 | */ | |
368 | struct rpc_filelist { | |
369 | char *name; | |
370 | struct file_operations *i_fop; | |
371 | int mode; | |
372 | }; | |
373 | ||
374 | static struct rpc_filelist files[] = { | |
375 | [RPCAUTH_lockd] = { | |
376 | .name = "lockd", | |
377 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
378 | }, | |
379 | [RPCAUTH_mount] = { | |
380 | .name = "mount", | |
381 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
382 | }, | |
383 | [RPCAUTH_nfs] = { | |
384 | .name = "nfs", | |
385 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
386 | }, | |
387 | [RPCAUTH_portmap] = { | |
388 | .name = "portmap", | |
389 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
390 | }, | |
391 | [RPCAUTH_statd] = { | |
392 | .name = "statd", | |
393 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
394 | }, | |
395 | }; | |
396 | ||
397 | enum { | |
398 | RPCAUTH_info = 2, | |
399 | RPCAUTH_EOF | |
400 | }; | |
401 | ||
402 | static struct rpc_filelist authfiles[] = { | |
403 | [RPCAUTH_info] = { | |
404 | .name = "info", | |
405 | .i_fop = &rpc_info_operations, | |
406 | .mode = S_IFREG | S_IRUSR, | |
407 | }, | |
408 | }; | |
409 | ||
410 | static int | |
411 | rpc_get_mount(void) | |
412 | { | |
413 | return simple_pin_fs("rpc_pipefs", &rpc_mount, &rpc_mount_count); | |
414 | } | |
415 | ||
416 | static void | |
417 | rpc_put_mount(void) | |
418 | { | |
419 | simple_release_fs(&rpc_mount, &rpc_mount_count); | |
420 | } | |
421 | ||
f134585a TM |
422 | static int |
423 | rpc_lookup_parent(char *path, struct nameidata *nd) | |
424 | { | |
425 | if (path[0] == '\0') | |
426 | return -ENOENT; | |
427 | if (rpc_get_mount()) { | |
428 | printk(KERN_WARNING "%s: %s failed to mount " | |
429 | "pseudofilesystem \n", __FILE__, __FUNCTION__); | |
430 | return -ENODEV; | |
431 | } | |
432 | nd->mnt = mntget(rpc_mount); | |
433 | nd->dentry = dget(rpc_mount->mnt_root); | |
434 | nd->last_type = LAST_ROOT; | |
435 | nd->flags = LOOKUP_PARENT; | |
436 | nd->depth = 0; | |
437 | ||
438 | if (path_walk(path, nd)) { | |
439 | printk(KERN_WARNING "%s: %s failed to find path %s\n", | |
440 | __FILE__, __FUNCTION__, path); | |
441 | rpc_put_mount(); | |
442 | return -ENOENT; | |
443 | } | |
444 | return 0; | |
445 | } | |
446 | ||
447 | static void | |
448 | rpc_release_path(struct nameidata *nd) | |
449 | { | |
450 | path_release(nd); | |
451 | rpc_put_mount(); | |
452 | } | |
453 | ||
1da177e4 LT |
454 | static struct inode * |
455 | rpc_get_inode(struct super_block *sb, int mode) | |
456 | { | |
457 | struct inode *inode = new_inode(sb); | |
458 | if (!inode) | |
459 | return NULL; | |
460 | inode->i_mode = mode; | |
461 | inode->i_uid = inode->i_gid = 0; | |
462 | inode->i_blksize = PAGE_CACHE_SIZE; | |
463 | inode->i_blocks = 0; | |
464 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
465 | switch(mode & S_IFMT) { | |
466 | case S_IFDIR: | |
467 | inode->i_fop = &simple_dir_operations; | |
468 | inode->i_op = &simple_dir_inode_operations; | |
469 | inode->i_nlink++; | |
470 | default: | |
471 | break; | |
472 | } | |
473 | return inode; | |
474 | } | |
475 | ||
476 | /* | |
477 | * FIXME: This probably has races. | |
478 | */ | |
479 | static void | |
480 | rpc_depopulate(struct dentry *parent) | |
481 | { | |
482 | struct inode *dir = parent->d_inode; | |
483 | struct list_head *pos, *next; | |
484 | struct dentry *dentry, *dvec[10]; | |
485 | int n = 0; | |
486 | ||
487 | down(&dir->i_sem); | |
488 | repeat: | |
489 | spin_lock(&dcache_lock); | |
490 | list_for_each_safe(pos, next, &parent->d_subdirs) { | |
491 | dentry = list_entry(pos, struct dentry, d_child); | |
492 | spin_lock(&dentry->d_lock); | |
493 | if (!d_unhashed(dentry)) { | |
494 | dget_locked(dentry); | |
495 | __d_drop(dentry); | |
496 | spin_unlock(&dentry->d_lock); | |
497 | dvec[n++] = dentry; | |
498 | if (n == ARRAY_SIZE(dvec)) | |
499 | break; | |
500 | } else | |
501 | spin_unlock(&dentry->d_lock); | |
502 | } | |
503 | spin_unlock(&dcache_lock); | |
504 | if (n) { | |
505 | do { | |
506 | dentry = dvec[--n]; | |
507 | if (dentry->d_inode) { | |
508 | rpc_close_pipes(dentry->d_inode); | |
1da177e4 LT |
509 | simple_unlink(dir, dentry); |
510 | } | |
511 | dput(dentry); | |
512 | } while (n); | |
513 | goto repeat; | |
514 | } | |
515 | up(&dir->i_sem); | |
516 | } | |
517 | ||
518 | static int | |
519 | rpc_populate(struct dentry *parent, | |
520 | struct rpc_filelist *files, | |
521 | int start, int eof) | |
522 | { | |
523 | struct inode *inode, *dir = parent->d_inode; | |
524 | void *private = RPC_I(dir)->private; | |
525 | struct dentry *dentry; | |
526 | int mode, i; | |
527 | ||
528 | down(&dir->i_sem); | |
529 | for (i = start; i < eof; i++) { | |
530 | dentry = d_alloc_name(parent, files[i].name); | |
531 | if (!dentry) | |
532 | goto out_bad; | |
533 | mode = files[i].mode; | |
534 | inode = rpc_get_inode(dir->i_sb, mode); | |
535 | if (!inode) { | |
536 | dput(dentry); | |
537 | goto out_bad; | |
538 | } | |
539 | inode->i_ino = i; | |
540 | if (files[i].i_fop) | |
541 | inode->i_fop = files[i].i_fop; | |
542 | if (private) | |
543 | rpc_inode_setowner(inode, private); | |
544 | if (S_ISDIR(mode)) | |
545 | dir->i_nlink++; | |
546 | d_add(dentry, inode); | |
547 | } | |
548 | up(&dir->i_sem); | |
549 | return 0; | |
550 | out_bad: | |
551 | up(&dir->i_sem); | |
552 | printk(KERN_WARNING "%s: %s failed to populate directory %s\n", | |
553 | __FILE__, __FUNCTION__, parent->d_name.name); | |
554 | return -ENOMEM; | |
555 | } | |
556 | ||
f134585a TM |
557 | static int |
558 | __rpc_mkdir(struct inode *dir, struct dentry *dentry) | |
1da177e4 LT |
559 | { |
560 | struct inode *inode; | |
f134585a TM |
561 | |
562 | inode = rpc_get_inode(dir->i_sb, S_IFDIR | S_IRUSR | S_IXUSR); | |
563 | if (!inode) | |
564 | goto out_err; | |
565 | inode->i_ino = iunique(dir->i_sb, 100); | |
566 | d_instantiate(dentry, inode); | |
567 | dir->i_nlink++; | |
568 | inode_dir_notify(dir, DN_CREATE); | |
569 | rpc_get_mount(); | |
570 | return 0; | |
571 | out_err: | |
572 | printk(KERN_WARNING "%s: %s failed to allocate inode for dentry %s\n", | |
573 | __FILE__, __FUNCTION__, dentry->d_name.name); | |
574 | return -ENOMEM; | |
575 | } | |
576 | ||
577 | static int | |
578 | __rpc_rmdir(struct inode *dir, struct dentry *dentry) | |
579 | { | |
1da177e4 LT |
580 | int error; |
581 | ||
f134585a | 582 | shrink_dcache_parent(dentry); |
6070fe6f | 583 | if (dentry->d_inode) |
f134585a | 584 | rpc_close_pipes(dentry->d_inode); |
f134585a TM |
585 | if ((error = simple_rmdir(dir, dentry)) != 0) |
586 | return error; | |
587 | if (!error) { | |
588 | inode_dir_notify(dir, DN_DELETE); | |
589 | d_drop(dentry); | |
590 | rpc_put_mount(); | |
591 | } | |
592 | return 0; | |
593 | } | |
1da177e4 | 594 | |
f134585a TM |
595 | static struct dentry * |
596 | rpc_lookup_negative(char *path, struct nameidata *nd) | |
597 | { | |
598 | struct dentry *dentry; | |
599 | struct inode *dir; | |
600 | int error; | |
278c995c | 601 | |
f134585a TM |
602 | if ((error = rpc_lookup_parent(path, nd)) != 0) |
603 | return ERR_PTR(error); | |
604 | dir = nd->dentry->d_inode; | |
1da177e4 | 605 | down(&dir->i_sem); |
49705b77 | 606 | dentry = lookup_hash(nd); |
1da177e4 | 607 | if (IS_ERR(dentry)) |
f134585a | 608 | goto out_err; |
1da177e4 | 609 | if (dentry->d_inode) { |
f134585a | 610 | dput(dentry); |
1da177e4 | 611 | dentry = ERR_PTR(-EEXIST); |
f134585a | 612 | goto out_err; |
1da177e4 | 613 | } |
f134585a TM |
614 | return dentry; |
615 | out_err: | |
278c995c | 616 | up(&dir->i_sem); |
f134585a TM |
617 | rpc_release_path(nd); |
618 | return dentry; | |
619 | } | |
278c995c | 620 | |
1da177e4 | 621 | |
f134585a TM |
622 | struct dentry * |
623 | rpc_mkdir(char *path, struct rpc_clnt *rpc_client) | |
624 | { | |
625 | struct nameidata nd; | |
626 | struct dentry *dentry; | |
627 | struct inode *dir; | |
628 | int error; | |
629 | ||
630 | dentry = rpc_lookup_negative(path, &nd); | |
631 | if (IS_ERR(dentry)) | |
632 | return dentry; | |
633 | dir = nd.dentry->d_inode; | |
634 | if ((error = __rpc_mkdir(dir, dentry)) != 0) | |
635 | goto err_dput; | |
636 | RPC_I(dentry->d_inode)->private = rpc_client; | |
1da177e4 LT |
637 | error = rpc_populate(dentry, authfiles, |
638 | RPCAUTH_info, RPCAUTH_EOF); | |
639 | if (error) | |
f134585a TM |
640 | goto err_depopulate; |
641 | out: | |
278c995c | 642 | up(&dir->i_sem); |
f134585a | 643 | rpc_release_path(&nd); |
278c995c | 644 | return dentry; |
f134585a TM |
645 | err_depopulate: |
646 | rpc_depopulate(dentry); | |
647 | __rpc_rmdir(dir, dentry); | |
648 | err_dput: | |
649 | dput(dentry); | |
650 | printk(KERN_WARNING "%s: %s() failed to create directory %s (errno = %d)\n", | |
651 | __FILE__, __FUNCTION__, path, error); | |
652 | dentry = ERR_PTR(error); | |
653 | goto out; | |
1da177e4 LT |
654 | } |
655 | ||
f134585a TM |
656 | int |
657 | rpc_rmdir(char *path) | |
1da177e4 | 658 | { |
f134585a TM |
659 | struct nameidata nd; |
660 | struct dentry *dentry; | |
661 | struct inode *dir; | |
662 | int error; | |
278c995c | 663 | |
f134585a TM |
664 | if ((error = rpc_lookup_parent(path, &nd)) != 0) |
665 | return error; | |
666 | dir = nd.dentry->d_inode; | |
667 | down(&dir->i_sem); | |
49705b77 | 668 | dentry = lookup_hash(&nd); |
f134585a TM |
669 | if (IS_ERR(dentry)) { |
670 | error = PTR_ERR(dentry); | |
671 | goto out_release; | |
278c995c | 672 | } |
f134585a TM |
673 | rpc_depopulate(dentry); |
674 | error = __rpc_rmdir(dir, dentry); | |
675 | dput(dentry); | |
676 | out_release: | |
677 | up(&dir->i_sem); | |
678 | rpc_release_path(&nd); | |
679 | return error; | |
1da177e4 LT |
680 | } |
681 | ||
682 | struct dentry * | |
f134585a | 683 | rpc_mkpipe(char *path, void *private, struct rpc_pipe_ops *ops, int flags) |
1da177e4 | 684 | { |
f134585a | 685 | struct nameidata nd; |
1da177e4 | 686 | struct dentry *dentry; |
f134585a | 687 | struct inode *dir, *inode; |
1da177e4 LT |
688 | struct rpc_inode *rpci; |
689 | ||
f134585a | 690 | dentry = rpc_lookup_negative(path, &nd); |
1da177e4 | 691 | if (IS_ERR(dentry)) |
f134585a TM |
692 | return dentry; |
693 | dir = nd.dentry->d_inode; | |
694 | inode = rpc_get_inode(dir->i_sb, S_IFSOCK | S_IRUSR | S_IWUSR); | |
695 | if (!inode) | |
696 | goto err_dput; | |
1da177e4 LT |
697 | inode->i_ino = iunique(dir->i_sb, 100); |
698 | inode->i_fop = &rpc_pipe_fops; | |
f134585a | 699 | d_instantiate(dentry, inode); |
1da177e4 LT |
700 | rpci = RPC_I(inode); |
701 | rpci->private = private; | |
702 | rpci->flags = flags; | |
703 | rpci->ops = ops; | |
704 | inode_dir_notify(dir, DN_CREATE); | |
f134585a TM |
705 | out: |
706 | up(&dir->i_sem); | |
707 | rpc_release_path(&nd); | |
1da177e4 | 708 | return dentry; |
f134585a | 709 | err_dput: |
1da177e4 | 710 | dput(dentry); |
f134585a TM |
711 | dentry = ERR_PTR(-ENOMEM); |
712 | printk(KERN_WARNING "%s: %s() failed to create pipe %s (errno = %d)\n", | |
713 | __FILE__, __FUNCTION__, path, -ENOMEM); | |
714 | goto out; | |
1da177e4 LT |
715 | } |
716 | ||
f134585a TM |
717 | int |
718 | rpc_unlink(char *path) | |
1da177e4 | 719 | { |
f134585a TM |
720 | struct nameidata nd; |
721 | struct dentry *dentry; | |
722 | struct inode *dir; | |
723 | int error; | |
1da177e4 | 724 | |
f134585a TM |
725 | if ((error = rpc_lookup_parent(path, &nd)) != 0) |
726 | return error; | |
727 | dir = nd.dentry->d_inode; | |
728 | down(&dir->i_sem); | |
49705b77 | 729 | dentry = lookup_hash(&nd); |
f134585a TM |
730 | if (IS_ERR(dentry)) { |
731 | error = PTR_ERR(dentry); | |
732 | goto out_release; | |
733 | } | |
734 | d_drop(dentry); | |
1da177e4 LT |
735 | if (dentry->d_inode) { |
736 | rpc_close_pipes(dentry->d_inode); | |
f134585a | 737 | error = simple_unlink(dir, dentry); |
1da177e4 | 738 | } |
f134585a TM |
739 | dput(dentry); |
740 | inode_dir_notify(dir, DN_DELETE); | |
741 | out_release: | |
742 | up(&dir->i_sem); | |
743 | rpc_release_path(&nd); | |
744 | return error; | |
1da177e4 LT |
745 | } |
746 | ||
747 | /* | |
748 | * populate the filesystem | |
749 | */ | |
750 | static struct super_operations s_ops = { | |
751 | .alloc_inode = rpc_alloc_inode, | |
752 | .destroy_inode = rpc_destroy_inode, | |
753 | .statfs = simple_statfs, | |
754 | }; | |
755 | ||
756 | #define RPCAUTH_GSSMAGIC 0x67596969 | |
757 | ||
758 | static int | |
759 | rpc_fill_super(struct super_block *sb, void *data, int silent) | |
760 | { | |
761 | struct inode *inode; | |
762 | struct dentry *root; | |
763 | ||
764 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
765 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
766 | sb->s_magic = RPCAUTH_GSSMAGIC; | |
767 | sb->s_op = &s_ops; | |
768 | sb->s_time_gran = 1; | |
769 | ||
770 | inode = rpc_get_inode(sb, S_IFDIR | 0755); | |
771 | if (!inode) | |
772 | return -ENOMEM; | |
773 | root = d_alloc_root(inode); | |
774 | if (!root) { | |
775 | iput(inode); | |
776 | return -ENOMEM; | |
777 | } | |
778 | if (rpc_populate(root, files, RPCAUTH_Root + 1, RPCAUTH_RootEOF)) | |
779 | goto out; | |
780 | sb->s_root = root; | |
781 | return 0; | |
782 | out: | |
783 | d_genocide(root); | |
784 | dput(root); | |
785 | return -ENOMEM; | |
786 | } | |
787 | ||
788 | static struct super_block * | |
789 | rpc_get_sb(struct file_system_type *fs_type, | |
790 | int flags, const char *dev_name, void *data) | |
791 | { | |
792 | return get_sb_single(fs_type, flags, data, rpc_fill_super); | |
793 | } | |
794 | ||
795 | static struct file_system_type rpc_pipe_fs_type = { | |
796 | .owner = THIS_MODULE, | |
797 | .name = "rpc_pipefs", | |
798 | .get_sb = rpc_get_sb, | |
799 | .kill_sb = kill_litter_super, | |
800 | }; | |
801 | ||
802 | static void | |
803 | init_once(void * foo, kmem_cache_t * cachep, unsigned long flags) | |
804 | { | |
805 | struct rpc_inode *rpci = (struct rpc_inode *) foo; | |
806 | ||
807 | if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == | |
808 | SLAB_CTOR_CONSTRUCTOR) { | |
809 | inode_init_once(&rpci->vfs_inode); | |
810 | rpci->private = NULL; | |
811 | rpci->nreaders = 0; | |
812 | rpci->nwriters = 0; | |
813 | INIT_LIST_HEAD(&rpci->in_upcall); | |
814 | INIT_LIST_HEAD(&rpci->pipe); | |
815 | rpci->pipelen = 0; | |
816 | init_waitqueue_head(&rpci->waitq); | |
817 | INIT_WORK(&rpci->queue_timeout, rpc_timeout_upcall_queue, rpci); | |
818 | rpci->ops = NULL; | |
819 | } | |
820 | } | |
821 | ||
822 | int register_rpc_pipefs(void) | |
823 | { | |
824 | rpc_inode_cachep = kmem_cache_create("rpc_inode_cache", | |
825 | sizeof(struct rpc_inode), | |
826 | 0, SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT, | |
827 | init_once, NULL); | |
828 | if (!rpc_inode_cachep) | |
829 | return -ENOMEM; | |
830 | register_filesystem(&rpc_pipe_fs_type); | |
831 | return 0; | |
832 | } | |
833 | ||
834 | void unregister_rpc_pipefs(void) | |
835 | { | |
836 | if (kmem_cache_destroy(rpc_inode_cachep)) | |
837 | printk(KERN_WARNING "RPC: unable to free inode cache\n"); | |
838 | unregister_filesystem(&rpc_pipe_fs_type); | |
839 | } |