Commit | Line | Data |
---|---|---|
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 | */ | |
1da177e4 LT |
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/namei.h> | |
50e437d5 | 17 | #include <linux/fsnotify.h> |
1da177e4 LT |
18 | #include <linux/kernel.h> |
19 | ||
20 | #include <asm/ioctls.h> | |
21 | #include <linux/fs.h> | |
22 | #include <linux/poll.h> | |
23 | #include <linux/wait.h> | |
24 | #include <linux/seq_file.h> | |
25 | ||
26 | #include <linux/sunrpc/clnt.h> | |
27 | #include <linux/workqueue.h> | |
28 | #include <linux/sunrpc/rpc_pipe_fs.h> | |
29 | ||
ba89966c | 30 | static struct vfsmount *rpc_mount __read_mostly; |
1da177e4 LT |
31 | static int rpc_mount_count; |
32 | ||
33 | static struct file_system_type rpc_pipe_fs_type; | |
34 | ||
35 | ||
e18b890b | 36 | static struct kmem_cache *rpc_inode_cachep __read_mostly; |
1da177e4 LT |
37 | |
38 | #define RPC_UPCALL_TIMEOUT (30*HZ) | |
39 | ||
9842ef35 TM |
40 | static void rpc_purge_list(struct rpc_inode *rpci, struct list_head *head, |
41 | void (*destroy_msg)(struct rpc_pipe_msg *), int err) | |
1da177e4 | 42 | { |
1da177e4 LT |
43 | struct rpc_pipe_msg *msg; |
44 | ||
9842ef35 TM |
45 | if (list_empty(head)) |
46 | return; | |
47 | do { | |
b3eb67a2 | 48 | msg = list_entry(head->next, struct rpc_pipe_msg, list); |
9842ef35 | 49 | list_del(&msg->list); |
1da177e4 | 50 | msg->errno = err; |
b3eb67a2 | 51 | destroy_msg(msg); |
9842ef35 | 52 | } while (!list_empty(head)); |
1da177e4 LT |
53 | wake_up(&rpci->waitq); |
54 | } | |
55 | ||
56 | static void | |
65f27f38 | 57 | rpc_timeout_upcall_queue(struct work_struct *work) |
1da177e4 | 58 | { |
9842ef35 | 59 | LIST_HEAD(free_list); |
65f27f38 DH |
60 | struct rpc_inode *rpci = |
61 | container_of(work, struct rpc_inode, queue_timeout.work); | |
1da177e4 | 62 | struct inode *inode = &rpci->vfs_inode; |
9842ef35 | 63 | void (*destroy_msg)(struct rpc_pipe_msg *); |
1da177e4 | 64 | |
9842ef35 TM |
65 | spin_lock(&inode->i_lock); |
66 | if (rpci->ops == NULL) { | |
67 | spin_unlock(&inode->i_lock); | |
68 | return; | |
69 | } | |
70 | destroy_msg = rpci->ops->destroy_msg; | |
71 | if (rpci->nreaders == 0) { | |
72 | list_splice_init(&rpci->pipe, &free_list); | |
73 | rpci->pipelen = 0; | |
74 | } | |
75 | spin_unlock(&inode->i_lock); | |
76 | rpc_purge_list(rpci, &free_list, destroy_msg, -ETIMEDOUT); | |
1da177e4 LT |
77 | } |
78 | ||
93a44a75 BF |
79 | /** |
80 | * rpc_queue_upcall | |
81 | * @inode: inode of upcall pipe on which to queue given message | |
82 | * @msg: message to queue | |
83 | * | |
84 | * Call with an @inode created by rpc_mkpipe() to queue an upcall. | |
85 | * A userspace process may then later read the upcall by performing a | |
86 | * read on an open file for this inode. It is up to the caller to | |
87 | * initialize the fields of @msg (other than @msg->list) appropriately. | |
88 | */ | |
1da177e4 LT |
89 | int |
90 | rpc_queue_upcall(struct inode *inode, struct rpc_pipe_msg *msg) | |
91 | { | |
92 | struct rpc_inode *rpci = RPC_I(inode); | |
6070fe6f | 93 | int res = -EPIPE; |
1da177e4 | 94 | |
9842ef35 | 95 | spin_lock(&inode->i_lock); |
6070fe6f TM |
96 | if (rpci->ops == NULL) |
97 | goto out; | |
1da177e4 LT |
98 | if (rpci->nreaders) { |
99 | list_add_tail(&msg->list, &rpci->pipe); | |
100 | rpci->pipelen += msg->len; | |
6070fe6f | 101 | res = 0; |
1da177e4 LT |
102 | } else if (rpci->flags & RPC_PIPE_WAIT_FOR_OPEN) { |
103 | if (list_empty(&rpci->pipe)) | |
24c5d9d7 TM |
104 | queue_delayed_work(rpciod_workqueue, |
105 | &rpci->queue_timeout, | |
1da177e4 LT |
106 | RPC_UPCALL_TIMEOUT); |
107 | list_add_tail(&msg->list, &rpci->pipe); | |
108 | rpci->pipelen += msg->len; | |
6070fe6f TM |
109 | res = 0; |
110 | } | |
111 | out: | |
9842ef35 | 112 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
113 | wake_up(&rpci->waitq); |
114 | return res; | |
115 | } | |
468039ee | 116 | EXPORT_SYMBOL_GPL(rpc_queue_upcall); |
1da177e4 | 117 | |
6070fe6f TM |
118 | static inline void |
119 | rpc_inode_setowner(struct inode *inode, void *private) | |
120 | { | |
121 | RPC_I(inode)->private = private; | |
122 | } | |
123 | ||
1da177e4 LT |
124 | static void |
125 | rpc_close_pipes(struct inode *inode) | |
126 | { | |
127 | struct rpc_inode *rpci = RPC_I(inode); | |
b693ba4a | 128 | const struct rpc_pipe_ops *ops; |
e712804a | 129 | int need_release; |
1da177e4 | 130 | |
1b1dcc1b | 131 | mutex_lock(&inode->i_mutex); |
9842ef35 TM |
132 | ops = rpci->ops; |
133 | if (ops != NULL) { | |
134 | LIST_HEAD(free_list); | |
9842ef35 | 135 | spin_lock(&inode->i_lock); |
e712804a | 136 | need_release = rpci->nreaders != 0 || rpci->nwriters != 0; |
1da177e4 | 137 | rpci->nreaders = 0; |
9842ef35 TM |
138 | list_splice_init(&rpci->in_upcall, &free_list); |
139 | list_splice_init(&rpci->pipe, &free_list); | |
140 | rpci->pipelen = 0; | |
1da177e4 | 141 | rpci->ops = NULL; |
9842ef35 TM |
142 | spin_unlock(&inode->i_lock); |
143 | rpc_purge_list(rpci, &free_list, ops->destroy_msg, -EPIPE); | |
144 | rpci->nwriters = 0; | |
e712804a | 145 | if (need_release && ops->release_pipe) |
9842ef35 | 146 | ops->release_pipe(inode); |
4011cd97 | 147 | cancel_delayed_work_sync(&rpci->queue_timeout); |
1da177e4 | 148 | } |
6070fe6f | 149 | rpc_inode_setowner(inode, NULL); |
1b1dcc1b | 150 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
151 | } |
152 | ||
1da177e4 LT |
153 | static struct inode * |
154 | rpc_alloc_inode(struct super_block *sb) | |
155 | { | |
156 | struct rpc_inode *rpci; | |
e94b1766 | 157 | rpci = (struct rpc_inode *)kmem_cache_alloc(rpc_inode_cachep, GFP_KERNEL); |
1da177e4 LT |
158 | if (!rpci) |
159 | return NULL; | |
160 | return &rpci->vfs_inode; | |
161 | } | |
162 | ||
163 | static void | |
164 | rpc_destroy_inode(struct inode *inode) | |
165 | { | |
166 | kmem_cache_free(rpc_inode_cachep, RPC_I(inode)); | |
167 | } | |
168 | ||
169 | static int | |
170 | rpc_pipe_open(struct inode *inode, struct file *filp) | |
171 | { | |
172 | struct rpc_inode *rpci = RPC_I(inode); | |
c3810608 | 173 | int first_open; |
1da177e4 LT |
174 | int res = -ENXIO; |
175 | ||
1b1dcc1b | 176 | mutex_lock(&inode->i_mutex); |
c3810608 BF |
177 | if (rpci->ops == NULL) |
178 | goto out; | |
179 | first_open = rpci->nreaders == 0 && rpci->nwriters == 0; | |
180 | if (first_open && rpci->ops->open_pipe) { | |
181 | res = rpci->ops->open_pipe(inode); | |
182 | if (res) | |
183 | goto out; | |
1da177e4 | 184 | } |
c3810608 BF |
185 | if (filp->f_mode & FMODE_READ) |
186 | rpci->nreaders++; | |
187 | if (filp->f_mode & FMODE_WRITE) | |
188 | rpci->nwriters++; | |
189 | res = 0; | |
190 | out: | |
1b1dcc1b | 191 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
192 | return res; |
193 | } | |
194 | ||
195 | static int | |
196 | rpc_pipe_release(struct inode *inode, struct file *filp) | |
197 | { | |
969b7f25 | 198 | struct rpc_inode *rpci = RPC_I(inode); |
1da177e4 | 199 | struct rpc_pipe_msg *msg; |
e712804a | 200 | int last_close; |
1da177e4 | 201 | |
1b1dcc1b | 202 | mutex_lock(&inode->i_mutex); |
1da177e4 LT |
203 | if (rpci->ops == NULL) |
204 | goto out; | |
205 | msg = (struct rpc_pipe_msg *)filp->private_data; | |
206 | if (msg != NULL) { | |
9842ef35 | 207 | spin_lock(&inode->i_lock); |
48e49187 | 208 | msg->errno = -EAGAIN; |
9842ef35 TM |
209 | list_del(&msg->list); |
210 | spin_unlock(&inode->i_lock); | |
1da177e4 LT |
211 | rpci->ops->destroy_msg(msg); |
212 | } | |
213 | if (filp->f_mode & FMODE_WRITE) | |
214 | rpci->nwriters --; | |
9842ef35 | 215 | if (filp->f_mode & FMODE_READ) { |
1da177e4 | 216 | rpci->nreaders --; |
9842ef35 TM |
217 | if (rpci->nreaders == 0) { |
218 | LIST_HEAD(free_list); | |
219 | spin_lock(&inode->i_lock); | |
220 | list_splice_init(&rpci->pipe, &free_list); | |
221 | rpci->pipelen = 0; | |
222 | spin_unlock(&inode->i_lock); | |
223 | rpc_purge_list(rpci, &free_list, | |
224 | rpci->ops->destroy_msg, -EAGAIN); | |
225 | } | |
226 | } | |
e712804a BF |
227 | last_close = rpci->nwriters == 0 && rpci->nreaders == 0; |
228 | if (last_close && rpci->ops->release_pipe) | |
1da177e4 LT |
229 | rpci->ops->release_pipe(inode); |
230 | out: | |
1b1dcc1b | 231 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
232 | return 0; |
233 | } | |
234 | ||
235 | static ssize_t | |
236 | rpc_pipe_read(struct file *filp, char __user *buf, size_t len, loff_t *offset) | |
237 | { | |
303b46bb | 238 | struct inode *inode = filp->f_path.dentry->d_inode; |
1da177e4 LT |
239 | struct rpc_inode *rpci = RPC_I(inode); |
240 | struct rpc_pipe_msg *msg; | |
241 | int res = 0; | |
242 | ||
1b1dcc1b | 243 | mutex_lock(&inode->i_mutex); |
1da177e4 LT |
244 | if (rpci->ops == NULL) { |
245 | res = -EPIPE; | |
246 | goto out_unlock; | |
247 | } | |
248 | msg = filp->private_data; | |
249 | if (msg == NULL) { | |
9842ef35 | 250 | spin_lock(&inode->i_lock); |
1da177e4 LT |
251 | if (!list_empty(&rpci->pipe)) { |
252 | msg = list_entry(rpci->pipe.next, | |
253 | struct rpc_pipe_msg, | |
254 | list); | |
255 | list_move(&msg->list, &rpci->in_upcall); | |
256 | rpci->pipelen -= msg->len; | |
257 | filp->private_data = msg; | |
258 | msg->copied = 0; | |
259 | } | |
9842ef35 | 260 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
261 | if (msg == NULL) |
262 | goto out_unlock; | |
263 | } | |
264 | /* NOTE: it is up to the callback to update msg->copied */ | |
265 | res = rpci->ops->upcall(filp, msg, buf, len); | |
266 | if (res < 0 || msg->len == msg->copied) { | |
267 | filp->private_data = NULL; | |
9842ef35 TM |
268 | spin_lock(&inode->i_lock); |
269 | list_del(&msg->list); | |
270 | spin_unlock(&inode->i_lock); | |
1da177e4 LT |
271 | rpci->ops->destroy_msg(msg); |
272 | } | |
273 | out_unlock: | |
1b1dcc1b | 274 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
275 | return res; |
276 | } | |
277 | ||
278 | static ssize_t | |
279 | rpc_pipe_write(struct file *filp, const char __user *buf, size_t len, loff_t *offset) | |
280 | { | |
303b46bb | 281 | struct inode *inode = filp->f_path.dentry->d_inode; |
1da177e4 LT |
282 | struct rpc_inode *rpci = RPC_I(inode); |
283 | int res; | |
284 | ||
1b1dcc1b | 285 | mutex_lock(&inode->i_mutex); |
1da177e4 LT |
286 | res = -EPIPE; |
287 | if (rpci->ops != NULL) | |
288 | res = rpci->ops->downcall(filp, buf, len); | |
1b1dcc1b | 289 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
290 | return res; |
291 | } | |
292 | ||
293 | static unsigned int | |
294 | rpc_pipe_poll(struct file *filp, struct poll_table_struct *wait) | |
295 | { | |
296 | struct rpc_inode *rpci; | |
297 | unsigned int mask = 0; | |
298 | ||
303b46bb | 299 | rpci = RPC_I(filp->f_path.dentry->d_inode); |
1da177e4 LT |
300 | poll_wait(filp, &rpci->waitq, wait); |
301 | ||
302 | mask = POLLOUT | POLLWRNORM; | |
303 | if (rpci->ops == NULL) | |
304 | mask |= POLLERR | POLLHUP; | |
eda4f9b7 | 305 | if (filp->private_data || !list_empty(&rpci->pipe)) |
1da177e4 LT |
306 | mask |= POLLIN | POLLRDNORM; |
307 | return mask; | |
308 | } | |
309 | ||
310 | static int | |
311 | rpc_pipe_ioctl(struct inode *ino, struct file *filp, | |
312 | unsigned int cmd, unsigned long arg) | |
313 | { | |
303b46bb | 314 | struct rpc_inode *rpci = RPC_I(filp->f_path.dentry->d_inode); |
1da177e4 LT |
315 | int len; |
316 | ||
317 | switch (cmd) { | |
318 | case FIONREAD: | |
319 | if (rpci->ops == NULL) | |
320 | return -EPIPE; | |
321 | len = rpci->pipelen; | |
322 | if (filp->private_data) { | |
323 | struct rpc_pipe_msg *msg; | |
324 | msg = (struct rpc_pipe_msg *)filp->private_data; | |
325 | len += msg->len - msg->copied; | |
326 | } | |
327 | return put_user(len, (int __user *)arg); | |
328 | default: | |
329 | return -EINVAL; | |
330 | } | |
331 | } | |
332 | ||
da7071d7 | 333 | static const struct file_operations rpc_pipe_fops = { |
1da177e4 LT |
334 | .owner = THIS_MODULE, |
335 | .llseek = no_llseek, | |
336 | .read = rpc_pipe_read, | |
337 | .write = rpc_pipe_write, | |
338 | .poll = rpc_pipe_poll, | |
339 | .ioctl = rpc_pipe_ioctl, | |
340 | .open = rpc_pipe_open, | |
341 | .release = rpc_pipe_release, | |
342 | }; | |
343 | ||
344 | static int | |
345 | rpc_show_info(struct seq_file *m, void *v) | |
346 | { | |
347 | struct rpc_clnt *clnt = m->private; | |
348 | ||
349 | seq_printf(m, "RPC server: %s\n", clnt->cl_server); | |
350 | seq_printf(m, "service: %s (%d) version %d\n", clnt->cl_protname, | |
351 | clnt->cl_prog, clnt->cl_vers); | |
e7f78657 CL |
352 | seq_printf(m, "address: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_ADDR)); |
353 | seq_printf(m, "protocol: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PROTO)); | |
bf19aace | 354 | seq_printf(m, "port: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PORT)); |
1da177e4 LT |
355 | return 0; |
356 | } | |
357 | ||
358 | static int | |
359 | rpc_info_open(struct inode *inode, struct file *file) | |
360 | { | |
361 | struct rpc_clnt *clnt; | |
362 | int ret = single_open(file, rpc_show_info, NULL); | |
363 | ||
364 | if (!ret) { | |
365 | struct seq_file *m = file->private_data; | |
1b1dcc1b | 366 | mutex_lock(&inode->i_mutex); |
1da177e4 LT |
367 | clnt = RPC_I(inode)->private; |
368 | if (clnt) { | |
34f52e35 | 369 | kref_get(&clnt->cl_kref); |
1da177e4 LT |
370 | m->private = clnt; |
371 | } else { | |
372 | single_release(inode, file); | |
373 | ret = -EINVAL; | |
374 | } | |
1b1dcc1b | 375 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
376 | } |
377 | return ret; | |
378 | } | |
379 | ||
380 | static int | |
381 | rpc_info_release(struct inode *inode, struct file *file) | |
382 | { | |
383 | struct seq_file *m = file->private_data; | |
384 | struct rpc_clnt *clnt = (struct rpc_clnt *)m->private; | |
385 | ||
386 | if (clnt) | |
387 | rpc_release_client(clnt); | |
388 | return single_release(inode, file); | |
389 | } | |
390 | ||
da7071d7 | 391 | static const struct file_operations rpc_info_operations = { |
1da177e4 LT |
392 | .owner = THIS_MODULE, |
393 | .open = rpc_info_open, | |
394 | .read = seq_read, | |
395 | .llseek = seq_lseek, | |
396 | .release = rpc_info_release, | |
397 | }; | |
398 | ||
399 | ||
1da177e4 LT |
400 | /* |
401 | * Description of fs contents. | |
402 | */ | |
403 | struct rpc_filelist { | |
ac6fecee | 404 | const char *name; |
99ac48f5 | 405 | const struct file_operations *i_fop; |
7364af6a | 406 | umode_t mode; |
1da177e4 LT |
407 | }; |
408 | ||
1da177e4 | 409 | enum { |
ac6fecee | 410 | RPCAUTH_info, |
1da177e4 LT |
411 | RPCAUTH_EOF |
412 | }; | |
413 | ||
ac6fecee | 414 | static const struct rpc_filelist authfiles[] = { |
1da177e4 LT |
415 | [RPCAUTH_info] = { |
416 | .name = "info", | |
417 | .i_fop = &rpc_info_operations, | |
418 | .mode = S_IFREG | S_IRUSR, | |
419 | }, | |
420 | }; | |
421 | ||
54281548 | 422 | struct vfsmount *rpc_get_mount(void) |
1da177e4 | 423 | { |
54281548 TM |
424 | int err; |
425 | ||
1f5ce9e9 | 426 | err = simple_pin_fs(&rpc_pipe_fs_type, &rpc_mount, &rpc_mount_count); |
54281548 TM |
427 | if (err != 0) |
428 | return ERR_PTR(err); | |
429 | return rpc_mount; | |
1da177e4 LT |
430 | } |
431 | ||
54281548 | 432 | void rpc_put_mount(void) |
1da177e4 LT |
433 | { |
434 | simple_release_fs(&rpc_mount, &rpc_mount_count); | |
435 | } | |
436 | ||
62e1761c TM |
437 | static int rpc_delete_dentry(struct dentry *dentry) |
438 | { | |
439 | return 1; | |
440 | } | |
441 | ||
3ba13d17 | 442 | static const struct dentry_operations rpc_dentry_operations = { |
62e1761c TM |
443 | .d_delete = rpc_delete_dentry, |
444 | }; | |
445 | ||
b5bb61da TM |
446 | static int __rpc_lookup_path(const char *pathname, unsigned flags, |
447 | struct nameidata *nd) | |
f134585a | 448 | { |
4ac4efc1 JJS |
449 | struct vfsmount *mnt; |
450 | ||
b5bb61da | 451 | if (pathname[0] == '\0') |
f134585a | 452 | return -ENOENT; |
4ac4efc1 JJS |
453 | |
454 | mnt = rpc_get_mount(); | |
455 | if (IS_ERR(mnt)) { | |
f134585a | 456 | printk(KERN_WARNING "%s: %s failed to mount " |
0dc47877 | 457 | "pseudofilesystem \n", __FILE__, __func__); |
4ac4efc1 | 458 | return PTR_ERR(mnt); |
f134585a | 459 | } |
f134585a | 460 | |
b5bb61da | 461 | if (vfs_path_lookup(mnt->mnt_root, mnt, pathname, flags, nd)) { |
f134585a | 462 | printk(KERN_WARNING "%s: %s failed to find path %s\n", |
b5bb61da | 463 | __FILE__, __func__, pathname); |
f134585a TM |
464 | rpc_put_mount(); |
465 | return -ENOENT; | |
466 | } | |
467 | return 0; | |
468 | } | |
469 | ||
b5bb61da TM |
470 | static int rpc_lookup_parent(const char *pathname, struct nameidata *nd) |
471 | { | |
472 | return __rpc_lookup_path(pathname, LOOKUP_PARENT, nd); | |
473 | } | |
474 | ||
f134585a TM |
475 | static void |
476 | rpc_release_path(struct nameidata *nd) | |
477 | { | |
1d957f9b | 478 | path_put(&nd->path); |
f134585a TM |
479 | rpc_put_mount(); |
480 | } | |
481 | ||
1da177e4 | 482 | static struct inode * |
7364af6a | 483 | rpc_get_inode(struct super_block *sb, umode_t mode) |
1da177e4 LT |
484 | { |
485 | struct inode *inode = new_inode(sb); | |
486 | if (!inode) | |
487 | return NULL; | |
488 | inode->i_mode = mode; | |
1da177e4 LT |
489 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
490 | switch(mode & S_IFMT) { | |
491 | case S_IFDIR: | |
492 | inode->i_fop = &simple_dir_operations; | |
493 | inode->i_op = &simple_dir_inode_operations; | |
d8c76e6f | 494 | inc_nlink(inode); |
1da177e4 LT |
495 | default: |
496 | break; | |
497 | } | |
498 | return inode; | |
499 | } | |
500 | ||
7589806e TM |
501 | static int __rpc_create_common(struct inode *dir, struct dentry *dentry, |
502 | umode_t mode, | |
503 | const struct file_operations *i_fop, | |
504 | void *private) | |
505 | { | |
506 | struct inode *inode; | |
507 | ||
508 | BUG_ON(!d_unhashed(dentry)); | |
509 | inode = rpc_get_inode(dir->i_sb, mode); | |
510 | if (!inode) | |
511 | goto out_err; | |
512 | inode->i_ino = iunique(dir->i_sb, 100); | |
513 | if (i_fop) | |
514 | inode->i_fop = i_fop; | |
515 | if (private) | |
516 | rpc_inode_setowner(inode, private); | |
517 | d_add(dentry, inode); | |
518 | return 0; | |
519 | out_err: | |
520 | printk(KERN_WARNING "%s: %s failed to allocate inode for dentry %s\n", | |
521 | __FILE__, __func__, dentry->d_name.name); | |
522 | dput(dentry); | |
523 | return -ENOMEM; | |
524 | } | |
525 | ||
ac6fecee TM |
526 | static int __rpc_create(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_IFREG | mode, i_fop, private); | |
534 | if (err) | |
535 | return err; | |
536 | fsnotify_create(dir, dentry); | |
537 | return 0; | |
538 | } | |
539 | ||
7589806e TM |
540 | static int __rpc_mkdir(struct inode *dir, struct dentry *dentry, |
541 | umode_t mode, | |
542 | const struct file_operations *i_fop, | |
543 | void *private) | |
544 | { | |
545 | int err; | |
546 | ||
547 | err = __rpc_create_common(dir, dentry, S_IFDIR | mode, i_fop, private); | |
548 | if (err) | |
549 | return err; | |
550 | inc_nlink(dir); | |
551 | fsnotify_mkdir(dir, dentry); | |
552 | return 0; | |
553 | } | |
554 | ||
555 | static int __rpc_mkpipe(struct inode *dir, struct dentry *dentry, | |
556 | umode_t mode, | |
557 | const struct file_operations *i_fop, | |
558 | void *private, | |
559 | const struct rpc_pipe_ops *ops, | |
560 | int flags) | |
561 | { | |
562 | struct rpc_inode *rpci; | |
563 | int err; | |
564 | ||
565 | err = __rpc_create_common(dir, dentry, S_IFIFO | mode, i_fop, private); | |
566 | if (err) | |
567 | return err; | |
568 | rpci = RPC_I(dentry->d_inode); | |
569 | rpci->nkern_readwriters = 1; | |
570 | rpci->private = private; | |
571 | rpci->flags = flags; | |
572 | rpci->ops = ops; | |
573 | fsnotify_create(dir, dentry); | |
574 | return 0; | |
575 | } | |
576 | ||
ac6fecee TM |
577 | static int __rpc_rmdir(struct inode *dir, struct dentry *dentry) |
578 | { | |
579 | int ret; | |
580 | ||
581 | dget(dentry); | |
582 | ret = simple_rmdir(dir, dentry); | |
583 | d_delete(dentry); | |
584 | dput(dentry); | |
585 | return ret; | |
586 | } | |
587 | ||
810d90bc TM |
588 | static int __rpc_unlink(struct inode *dir, struct dentry *dentry) |
589 | { | |
590 | int ret; | |
591 | ||
592 | dget(dentry); | |
593 | ret = simple_unlink(dir, dentry); | |
594 | d_delete(dentry); | |
595 | dput(dentry); | |
596 | return ret; | |
597 | } | |
598 | ||
599 | static int __rpc_rmpipe(struct inode *dir, struct dentry *dentry) | |
600 | { | |
601 | struct inode *inode = dentry->d_inode; | |
602 | struct rpc_inode *rpci = RPC_I(inode); | |
603 | ||
604 | rpci->nkern_readwriters--; | |
605 | if (rpci->nkern_readwriters != 0) | |
606 | return 0; | |
607 | rpc_close_pipes(inode); | |
608 | return __rpc_unlink(dir, dentry); | |
609 | } | |
610 | ||
cfeaa4a3 TM |
611 | static struct dentry *__rpc_lookup_create(struct dentry *parent, |
612 | struct qstr *name) | |
613 | { | |
614 | struct dentry *dentry; | |
615 | ||
616 | dentry = d_lookup(parent, name); | |
617 | if (!dentry) { | |
618 | dentry = d_alloc(parent, name); | |
619 | if (!dentry) { | |
620 | dentry = ERR_PTR(-ENOMEM); | |
621 | goto out_err; | |
622 | } | |
623 | } | |
624 | if (!dentry->d_inode) | |
625 | dentry->d_op = &rpc_dentry_operations; | |
626 | out_err: | |
627 | return dentry; | |
628 | } | |
629 | ||
630 | static struct dentry *__rpc_lookup_create_exclusive(struct dentry *parent, | |
631 | struct qstr *name) | |
632 | { | |
633 | struct dentry *dentry; | |
634 | ||
635 | dentry = __rpc_lookup_create(parent, name); | |
636 | if (dentry->d_inode == NULL) | |
637 | return dentry; | |
638 | dput(dentry); | |
639 | return ERR_PTR(-EEXIST); | |
640 | } | |
641 | ||
642 | static struct dentry *rpc_lookup_negative(const char *path, | |
643 | struct nameidata *nd) | |
644 | { | |
645 | struct inode *dir; | |
646 | struct dentry *dentry; | |
647 | int error; | |
648 | ||
649 | error = rpc_lookup_parent(path, nd); | |
650 | if (error != 0) | |
651 | return ERR_PTR(error); | |
652 | dir = nd->path.dentry->d_inode; | |
653 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); | |
654 | dentry = __rpc_lookup_create_exclusive(nd->path.dentry, &nd->last); | |
655 | if (IS_ERR(dentry)) { | |
656 | mutex_unlock(&dir->i_mutex); | |
657 | rpc_release_path(nd); | |
658 | } | |
659 | return dentry; | |
660 | } | |
661 | ||
1da177e4 LT |
662 | /* |
663 | * FIXME: This probably has races. | |
664 | */ | |
ac6fecee TM |
665 | static void __rpc_depopulate(struct dentry *parent, |
666 | const struct rpc_filelist *files, | |
667 | int start, int eof) | |
1da177e4 LT |
668 | { |
669 | struct inode *dir = parent->d_inode; | |
ac6fecee TM |
670 | struct dentry *dentry; |
671 | struct qstr name; | |
672 | int i; | |
1da177e4 | 673 | |
ac6fecee TM |
674 | for (i = start; i < eof; i++) { |
675 | name.name = files[i].name; | |
676 | name.len = strlen(files[i].name); | |
677 | name.hash = full_name_hash(name.name, name.len); | |
678 | dentry = d_lookup(parent, &name); | |
679 | ||
680 | if (dentry == NULL) | |
62e1761c | 681 | continue; |
ac6fecee TM |
682 | if (dentry->d_inode == NULL) |
683 | goto next; | |
684 | switch (dentry->d_inode->i_mode & S_IFMT) { | |
685 | default: | |
686 | BUG(); | |
687 | case S_IFREG: | |
688 | __rpc_unlink(dir, dentry); | |
1da177e4 | 689 | break; |
ac6fecee TM |
690 | case S_IFDIR: |
691 | __rpc_rmdir(dir, dentry); | |
692 | } | |
693 | next: | |
694 | dput(dentry); | |
1da177e4 | 695 | } |
ac6fecee TM |
696 | } |
697 | ||
698 | static void rpc_depopulate(struct dentry *parent, | |
699 | const struct rpc_filelist *files, | |
700 | int start, int eof) | |
701 | { | |
702 | struct inode *dir = parent->d_inode; | |
703 | ||
704 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_CHILD); | |
705 | __rpc_depopulate(parent, files, start, eof); | |
1b1dcc1b | 706 | mutex_unlock(&dir->i_mutex); |
1da177e4 LT |
707 | } |
708 | ||
ac6fecee TM |
709 | static int rpc_populate(struct dentry *parent, |
710 | const struct rpc_filelist *files, | |
711 | int start, int eof, | |
712 | void *private) | |
1da177e4 | 713 | { |
ac6fecee | 714 | struct inode *dir = parent->d_inode; |
1da177e4 | 715 | struct dentry *dentry; |
ac6fecee | 716 | int i, err; |
1da177e4 | 717 | |
1b1dcc1b | 718 | mutex_lock(&dir->i_mutex); |
1da177e4 | 719 | for (i = start; i < eof; i++) { |
ac6fecee TM |
720 | struct qstr q; |
721 | ||
722 | q.name = files[i].name; | |
723 | q.len = strlen(files[i].name); | |
724 | q.hash = full_name_hash(q.name, q.len); | |
725 | dentry = __rpc_lookup_create_exclusive(parent, &q); | |
726 | err = PTR_ERR(dentry); | |
727 | if (IS_ERR(dentry)) | |
1da177e4 | 728 | goto out_bad; |
ac6fecee TM |
729 | switch (files[i].mode & S_IFMT) { |
730 | default: | |
731 | BUG(); | |
732 | case S_IFREG: | |
733 | err = __rpc_create(dir, dentry, | |
734 | files[i].mode, | |
735 | files[i].i_fop, | |
736 | private); | |
737 | break; | |
738 | case S_IFDIR: | |
739 | err = __rpc_mkdir(dir, dentry, | |
740 | files[i].mode, | |
741 | NULL, | |
742 | private); | |
1da177e4 | 743 | } |
ac6fecee TM |
744 | if (err != 0) |
745 | goto out_bad; | |
1da177e4 | 746 | } |
1b1dcc1b | 747 | mutex_unlock(&dir->i_mutex); |
1da177e4 LT |
748 | return 0; |
749 | out_bad: | |
ac6fecee | 750 | __rpc_depopulate(parent, files, start, eof); |
1b1dcc1b | 751 | mutex_unlock(&dir->i_mutex); |
1da177e4 | 752 | printk(KERN_WARNING "%s: %s failed to populate directory %s\n", |
0dc47877 | 753 | __FILE__, __func__, parent->d_name.name); |
ac6fecee | 754 | return err; |
f134585a | 755 | } |
1da177e4 | 756 | |
93a44a75 | 757 | /** |
458adb8b | 758 | * rpc_create_client_dir - Create a new rpc_client directory in rpc_pipefs |
93a44a75 | 759 | * @path: path from the rpc_pipefs root to the new directory |
65b6e42c | 760 | * @rpc_client: rpc client to associate with this directory |
93a44a75 BF |
761 | * |
762 | * This creates a directory at the given @path associated with | |
763 | * @rpc_clnt, which will contain a file named "info" with some basic | |
764 | * information about the client, together with any "pipes" that may | |
765 | * later be created using rpc_mkpipe(). | |
766 | */ | |
458adb8b TM |
767 | struct dentry *rpc_create_client_dir(const char *path, |
768 | struct rpc_clnt *rpc_client) | |
f134585a TM |
769 | { |
770 | struct nameidata nd; | |
771 | struct dentry *dentry; | |
772 | struct inode *dir; | |
773 | int error; | |
774 | ||
775 | dentry = rpc_lookup_negative(path, &nd); | |
776 | if (IS_ERR(dentry)) | |
777 | return dentry; | |
4ac91378 | 778 | dir = nd.path.dentry->d_inode; |
7589806e TM |
779 | error = __rpc_mkdir(dir, dentry, S_IRUGO | S_IXUGO, NULL, rpc_client); |
780 | if (error != 0) | |
781 | goto out_err; | |
1da177e4 | 782 | error = rpc_populate(dentry, authfiles, |
ac6fecee | 783 | RPCAUTH_info, RPCAUTH_EOF, rpc_client); |
1da177e4 | 784 | if (error) |
ac6fecee | 785 | goto err_rmdir; |
f134585a | 786 | out: |
1b1dcc1b | 787 | mutex_unlock(&dir->i_mutex); |
f134585a | 788 | rpc_release_path(&nd); |
5c3e985a | 789 | return dentry; |
ac6fecee | 790 | err_rmdir: |
f134585a | 791 | __rpc_rmdir(dir, dentry); |
7589806e | 792 | out_err: |
f134585a | 793 | printk(KERN_WARNING "%s: %s() failed to create directory %s (errno = %d)\n", |
0dc47877 | 794 | __FILE__, __func__, path, error); |
f134585a TM |
795 | dentry = ERR_PTR(error); |
796 | goto out; | |
1da177e4 LT |
797 | } |
798 | ||
93a44a75 | 799 | /** |
458adb8b | 800 | * rpc_remove_client_dir - Remove a directory created with rpc_create_client_dir() |
93a44a75 BF |
801 | * @dentry: directory to remove |
802 | */ | |
458adb8b | 803 | int rpc_remove_client_dir(struct dentry *dentry) |
1da177e4 | 804 | { |
dff02cc1 | 805 | struct dentry *parent; |
f134585a TM |
806 | struct inode *dir; |
807 | int error; | |
278c995c | 808 | |
dff02cc1 TM |
809 | parent = dget_parent(dentry); |
810 | dir = parent->d_inode; | |
c6573c29 | 811 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); |
ac6fecee | 812 | rpc_depopulate(dentry, authfiles, RPCAUTH_info, RPCAUTH_EOF); |
f134585a | 813 | error = __rpc_rmdir(dir, dentry); |
1b1dcc1b | 814 | mutex_unlock(&dir->i_mutex); |
dff02cc1 | 815 | dput(parent); |
f134585a | 816 | return error; |
1da177e4 LT |
817 | } |
818 | ||
93a44a75 BF |
819 | /** |
820 | * rpc_mkpipe - make an rpc_pipefs file for kernel<->userspace communication | |
821 | * @parent: dentry of directory to create new "pipe" in | |
822 | * @name: name of pipe | |
823 | * @private: private data to associate with the pipe, for the caller's use | |
824 | * @ops: operations defining the behavior of the pipe: upcall, downcall, | |
c3810608 | 825 | * release_pipe, open_pipe, and destroy_msg. |
65b6e42c | 826 | * @flags: rpc_inode flags |
93a44a75 BF |
827 | * |
828 | * Data is made available for userspace to read by calls to | |
829 | * rpc_queue_upcall(). The actual reads will result in calls to | |
830 | * @ops->upcall, which will be called with the file pointer, | |
831 | * message, and userspace buffer to copy to. | |
832 | * | |
833 | * Writes can come at any time, and do not necessarily have to be | |
834 | * responses to upcalls. They will result in calls to @msg->downcall. | |
835 | * | |
836 | * The @private argument passed here will be available to all these methods | |
837 | * from the file pointer, via RPC_I(file->f_dentry->d_inode)->private. | |
838 | */ | |
b693ba4a TM |
839 | struct dentry *rpc_mkpipe(struct dentry *parent, const char *name, |
840 | void *private, const struct rpc_pipe_ops *ops, | |
841 | int flags) | |
1da177e4 | 842 | { |
1da177e4 | 843 | struct dentry *dentry; |
7589806e | 844 | struct inode *dir = parent->d_inode; |
7364af6a | 845 | umode_t umode = S_IFIFO | S_IRUSR | S_IWUSR; |
cfeaa4a3 | 846 | struct qstr q; |
7589806e | 847 | int err; |
7364af6a TM |
848 | |
849 | if (ops->upcall == NULL) | |
850 | umode &= ~S_IRUGO; | |
851 | if (ops->downcall == NULL) | |
852 | umode &= ~S_IWUGO; | |
1da177e4 | 853 | |
cfeaa4a3 TM |
854 | q.name = name; |
855 | q.len = strlen(name); | |
856 | q.hash = full_name_hash(q.name, q.len), | |
857 | ||
858 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); | |
859 | dentry = __rpc_lookup_create(parent, &q); | |
1da177e4 | 860 | if (IS_ERR(dentry)) |
cfeaa4a3 | 861 | goto out; |
34f30896 | 862 | if (dentry->d_inode) { |
7589806e | 863 | struct rpc_inode *rpci = RPC_I(dentry->d_inode); |
34f30896 TM |
864 | if (rpci->private != private || |
865 | rpci->ops != ops || | |
866 | rpci->flags != flags) { | |
867 | dput (dentry); | |
810d90bc TM |
868 | err = -EBUSY; |
869 | goto out_err; | |
34f30896 | 870 | } |
03a1256f | 871 | rpci->nkern_readwriters++; |
34f30896 TM |
872 | goto out; |
873 | } | |
7589806e TM |
874 | |
875 | err = __rpc_mkpipe(dir, dentry, umode, &rpc_pipe_fops, | |
810d90bc | 876 | private, ops, flags); |
7589806e TM |
877 | if (err) |
878 | goto out_err; | |
f134585a | 879 | out: |
1b1dcc1b | 880 | mutex_unlock(&dir->i_mutex); |
5c3e985a | 881 | return dentry; |
7589806e TM |
882 | out_err: |
883 | dentry = ERR_PTR(err); | |
158998b6 | 884 | printk(KERN_WARNING "%s: %s() failed to create pipe %s/%s (errno = %d)\n", |
0dc47877 | 885 | __FILE__, __func__, parent->d_name.name, name, |
7589806e | 886 | err); |
f134585a | 887 | goto out; |
1da177e4 | 888 | } |
468039ee | 889 | EXPORT_SYMBOL_GPL(rpc_mkpipe); |
1da177e4 | 890 | |
93a44a75 BF |
891 | /** |
892 | * rpc_unlink - remove a pipe | |
893 | * @dentry: dentry for the pipe, as returned from rpc_mkpipe | |
894 | * | |
895 | * After this call, lookups will no longer find the pipe, and any | |
896 | * attempts to read or write using preexisting opens of the pipe will | |
897 | * return -EPIPE. | |
898 | */ | |
f134585a | 899 | int |
5d67476f | 900 | rpc_unlink(struct dentry *dentry) |
1da177e4 | 901 | { |
5d67476f | 902 | struct dentry *parent; |
f134585a | 903 | struct inode *dir; |
5d67476f | 904 | int error = 0; |
1da177e4 | 905 | |
5d67476f TM |
906 | parent = dget_parent(dentry); |
907 | dir = parent->d_inode; | |
c6573c29 | 908 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); |
810d90bc | 909 | error = __rpc_rmpipe(dir, dentry); |
1b1dcc1b | 910 | mutex_unlock(&dir->i_mutex); |
5d67476f | 911 | dput(parent); |
f134585a | 912 | return error; |
1da177e4 | 913 | } |
468039ee | 914 | EXPORT_SYMBOL_GPL(rpc_unlink); |
1da177e4 LT |
915 | |
916 | /* | |
917 | * populate the filesystem | |
918 | */ | |
919 | static struct super_operations s_ops = { | |
920 | .alloc_inode = rpc_alloc_inode, | |
921 | .destroy_inode = rpc_destroy_inode, | |
922 | .statfs = simple_statfs, | |
923 | }; | |
924 | ||
925 | #define RPCAUTH_GSSMAGIC 0x67596969 | |
926 | ||
bb156749 TM |
927 | /* |
928 | * We have a single directory with 1 node in it. | |
929 | */ | |
930 | enum { | |
931 | RPCAUTH_lockd, | |
932 | RPCAUTH_mount, | |
933 | RPCAUTH_nfs, | |
934 | RPCAUTH_portmap, | |
935 | RPCAUTH_statd, | |
936 | RPCAUTH_nfsd4_cb, | |
937 | RPCAUTH_RootEOF | |
938 | }; | |
939 | ||
940 | static const struct rpc_filelist files[] = { | |
941 | [RPCAUTH_lockd] = { | |
942 | .name = "lockd", | |
943 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
944 | }, | |
945 | [RPCAUTH_mount] = { | |
946 | .name = "mount", | |
947 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
948 | }, | |
949 | [RPCAUTH_nfs] = { | |
950 | .name = "nfs", | |
951 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
952 | }, | |
953 | [RPCAUTH_portmap] = { | |
954 | .name = "portmap", | |
955 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
956 | }, | |
957 | [RPCAUTH_statd] = { | |
958 | .name = "statd", | |
959 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
960 | }, | |
961 | [RPCAUTH_nfsd4_cb] = { | |
962 | .name = "nfsd4_cb", | |
963 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
964 | }, | |
965 | }; | |
966 | ||
1da177e4 LT |
967 | static int |
968 | rpc_fill_super(struct super_block *sb, void *data, int silent) | |
969 | { | |
970 | struct inode *inode; | |
971 | struct dentry *root; | |
972 | ||
973 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
974 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
975 | sb->s_magic = RPCAUTH_GSSMAGIC; | |
976 | sb->s_op = &s_ops; | |
977 | sb->s_time_gran = 1; | |
978 | ||
979 | inode = rpc_get_inode(sb, S_IFDIR | 0755); | |
980 | if (!inode) | |
981 | return -ENOMEM; | |
982 | root = d_alloc_root(inode); | |
983 | if (!root) { | |
984 | iput(inode); | |
985 | return -ENOMEM; | |
986 | } | |
ac6fecee | 987 | if (rpc_populate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF, NULL)) |
1da177e4 LT |
988 | goto out; |
989 | sb->s_root = root; | |
990 | return 0; | |
991 | out: | |
992 | d_genocide(root); | |
993 | dput(root); | |
994 | return -ENOMEM; | |
995 | } | |
996 | ||
454e2398 | 997 | static int |
1da177e4 | 998 | rpc_get_sb(struct file_system_type *fs_type, |
454e2398 | 999 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) |
1da177e4 | 1000 | { |
454e2398 | 1001 | return get_sb_single(fs_type, flags, data, rpc_fill_super, mnt); |
1da177e4 LT |
1002 | } |
1003 | ||
1004 | static struct file_system_type rpc_pipe_fs_type = { | |
1005 | .owner = THIS_MODULE, | |
1006 | .name = "rpc_pipefs", | |
1007 | .get_sb = rpc_get_sb, | |
1008 | .kill_sb = kill_litter_super, | |
1009 | }; | |
1010 | ||
1011 | static void | |
51cc5068 | 1012 | init_once(void *foo) |
1da177e4 LT |
1013 | { |
1014 | struct rpc_inode *rpci = (struct rpc_inode *) foo; | |
1015 | ||
a35afb83 CL |
1016 | inode_init_once(&rpci->vfs_inode); |
1017 | rpci->private = NULL; | |
1018 | rpci->nreaders = 0; | |
1019 | rpci->nwriters = 0; | |
1020 | INIT_LIST_HEAD(&rpci->in_upcall); | |
6e84c7b6 | 1021 | INIT_LIST_HEAD(&rpci->in_downcall); |
a35afb83 CL |
1022 | INIT_LIST_HEAD(&rpci->pipe); |
1023 | rpci->pipelen = 0; | |
1024 | init_waitqueue_head(&rpci->waitq); | |
1025 | INIT_DELAYED_WORK(&rpci->queue_timeout, | |
1026 | rpc_timeout_upcall_queue); | |
1027 | rpci->ops = NULL; | |
1da177e4 LT |
1028 | } |
1029 | ||
1030 | int register_rpc_pipefs(void) | |
1031 | { | |
5bd5f581 AM |
1032 | int err; |
1033 | ||
1da177e4 | 1034 | rpc_inode_cachep = kmem_cache_create("rpc_inode_cache", |
fffb60f9 PJ |
1035 | sizeof(struct rpc_inode), |
1036 | 0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| | |
1037 | SLAB_MEM_SPREAD), | |
20c2df83 | 1038 | init_once); |
1da177e4 LT |
1039 | if (!rpc_inode_cachep) |
1040 | return -ENOMEM; | |
5bd5f581 AM |
1041 | err = register_filesystem(&rpc_pipe_fs_type); |
1042 | if (err) { | |
1043 | kmem_cache_destroy(rpc_inode_cachep); | |
1044 | return err; | |
1045 | } | |
1046 | ||
1da177e4 LT |
1047 | return 0; |
1048 | } | |
1049 | ||
1050 | void unregister_rpc_pipefs(void) | |
1051 | { | |
1a1d92c1 | 1052 | kmem_cache_destroy(rpc_inode_cachep); |
1da177e4 LT |
1053 | unregister_filesystem(&rpc_pipe_fs_type); |
1054 | } |