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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 | ||
400 | /* | |
401 | * We have a single directory with 1 node in it. | |
402 | */ | |
403 | enum { | |
404 | RPCAUTH_Root = 1, | |
405 | RPCAUTH_lockd, | |
406 | RPCAUTH_mount, | |
407 | RPCAUTH_nfs, | |
408 | RPCAUTH_portmap, | |
409 | RPCAUTH_statd, | |
61054b14 | 410 | RPCAUTH_nfsd4_cb, |
1da177e4 LT |
411 | RPCAUTH_RootEOF |
412 | }; | |
413 | ||
414 | /* | |
415 | * Description of fs contents. | |
416 | */ | |
417 | struct rpc_filelist { | |
418 | char *name; | |
99ac48f5 | 419 | const struct file_operations *i_fop; |
7364af6a | 420 | umode_t mode; |
1da177e4 LT |
421 | }; |
422 | ||
423 | static struct rpc_filelist files[] = { | |
424 | [RPCAUTH_lockd] = { | |
425 | .name = "lockd", | |
426 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
427 | }, | |
428 | [RPCAUTH_mount] = { | |
429 | .name = "mount", | |
430 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
431 | }, | |
432 | [RPCAUTH_nfs] = { | |
433 | .name = "nfs", | |
434 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
435 | }, | |
436 | [RPCAUTH_portmap] = { | |
437 | .name = "portmap", | |
438 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
439 | }, | |
440 | [RPCAUTH_statd] = { | |
441 | .name = "statd", | |
442 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
443 | }, | |
61054b14 OK |
444 | [RPCAUTH_nfsd4_cb] = { |
445 | .name = "nfsd4_cb", | |
446 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
447 | }, | |
1da177e4 LT |
448 | }; |
449 | ||
450 | enum { | |
451 | RPCAUTH_info = 2, | |
452 | RPCAUTH_EOF | |
453 | }; | |
454 | ||
455 | static struct rpc_filelist authfiles[] = { | |
456 | [RPCAUTH_info] = { | |
457 | .name = "info", | |
458 | .i_fop = &rpc_info_operations, | |
459 | .mode = S_IFREG | S_IRUSR, | |
460 | }, | |
461 | }; | |
462 | ||
54281548 | 463 | struct vfsmount *rpc_get_mount(void) |
1da177e4 | 464 | { |
54281548 TM |
465 | int err; |
466 | ||
1f5ce9e9 | 467 | err = simple_pin_fs(&rpc_pipe_fs_type, &rpc_mount, &rpc_mount_count); |
54281548 TM |
468 | if (err != 0) |
469 | return ERR_PTR(err); | |
470 | return rpc_mount; | |
1da177e4 LT |
471 | } |
472 | ||
54281548 | 473 | void rpc_put_mount(void) |
1da177e4 LT |
474 | { |
475 | simple_release_fs(&rpc_mount, &rpc_mount_count); | |
476 | } | |
477 | ||
62e1761c TM |
478 | static int rpc_delete_dentry(struct dentry *dentry) |
479 | { | |
480 | return 1; | |
481 | } | |
482 | ||
3ba13d17 | 483 | static const struct dentry_operations rpc_dentry_operations = { |
62e1761c TM |
484 | .d_delete = rpc_delete_dentry, |
485 | }; | |
486 | ||
b5bb61da TM |
487 | static int __rpc_lookup_path(const char *pathname, unsigned flags, |
488 | struct nameidata *nd) | |
f134585a | 489 | { |
4ac4efc1 JJS |
490 | struct vfsmount *mnt; |
491 | ||
b5bb61da | 492 | if (pathname[0] == '\0') |
f134585a | 493 | return -ENOENT; |
4ac4efc1 JJS |
494 | |
495 | mnt = rpc_get_mount(); | |
496 | if (IS_ERR(mnt)) { | |
f134585a | 497 | printk(KERN_WARNING "%s: %s failed to mount " |
0dc47877 | 498 | "pseudofilesystem \n", __FILE__, __func__); |
4ac4efc1 | 499 | return PTR_ERR(mnt); |
f134585a | 500 | } |
f134585a | 501 | |
b5bb61da | 502 | if (vfs_path_lookup(mnt->mnt_root, mnt, pathname, flags, nd)) { |
f134585a | 503 | printk(KERN_WARNING "%s: %s failed to find path %s\n", |
b5bb61da | 504 | __FILE__, __func__, pathname); |
f134585a TM |
505 | rpc_put_mount(); |
506 | return -ENOENT; | |
507 | } | |
508 | return 0; | |
509 | } | |
510 | ||
b5bb61da TM |
511 | static int rpc_lookup_parent(const char *pathname, struct nameidata *nd) |
512 | { | |
513 | return __rpc_lookup_path(pathname, LOOKUP_PARENT, nd); | |
514 | } | |
515 | ||
f134585a TM |
516 | static void |
517 | rpc_release_path(struct nameidata *nd) | |
518 | { | |
1d957f9b | 519 | path_put(&nd->path); |
f134585a TM |
520 | rpc_put_mount(); |
521 | } | |
522 | ||
1da177e4 | 523 | static struct inode * |
7364af6a | 524 | rpc_get_inode(struct super_block *sb, umode_t mode) |
1da177e4 LT |
525 | { |
526 | struct inode *inode = new_inode(sb); | |
527 | if (!inode) | |
528 | return NULL; | |
529 | inode->i_mode = mode; | |
1da177e4 LT |
530 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
531 | switch(mode & S_IFMT) { | |
532 | case S_IFDIR: | |
533 | inode->i_fop = &simple_dir_operations; | |
534 | inode->i_op = &simple_dir_inode_operations; | |
d8c76e6f | 535 | inc_nlink(inode); |
1da177e4 LT |
536 | default: |
537 | break; | |
538 | } | |
539 | return inode; | |
540 | } | |
541 | ||
7589806e TM |
542 | static int __rpc_create_common(struct inode *dir, struct dentry *dentry, |
543 | umode_t mode, | |
544 | const struct file_operations *i_fop, | |
545 | void *private) | |
546 | { | |
547 | struct inode *inode; | |
548 | ||
549 | BUG_ON(!d_unhashed(dentry)); | |
550 | inode = rpc_get_inode(dir->i_sb, mode); | |
551 | if (!inode) | |
552 | goto out_err; | |
553 | inode->i_ino = iunique(dir->i_sb, 100); | |
554 | if (i_fop) | |
555 | inode->i_fop = i_fop; | |
556 | if (private) | |
557 | rpc_inode_setowner(inode, private); | |
558 | d_add(dentry, inode); | |
559 | return 0; | |
560 | out_err: | |
561 | printk(KERN_WARNING "%s: %s failed to allocate inode for dentry %s\n", | |
562 | __FILE__, __func__, dentry->d_name.name); | |
563 | dput(dentry); | |
564 | return -ENOMEM; | |
565 | } | |
566 | ||
567 | static int __rpc_mkdir(struct inode *dir, struct dentry *dentry, | |
568 | umode_t mode, | |
569 | const struct file_operations *i_fop, | |
570 | void *private) | |
571 | { | |
572 | int err; | |
573 | ||
574 | err = __rpc_create_common(dir, dentry, S_IFDIR | mode, i_fop, private); | |
575 | if (err) | |
576 | return err; | |
577 | inc_nlink(dir); | |
578 | fsnotify_mkdir(dir, dentry); | |
579 | return 0; | |
580 | } | |
581 | ||
582 | static int __rpc_mkpipe(struct inode *dir, struct dentry *dentry, | |
583 | umode_t mode, | |
584 | const struct file_operations *i_fop, | |
585 | void *private, | |
586 | const struct rpc_pipe_ops *ops, | |
587 | int flags) | |
588 | { | |
589 | struct rpc_inode *rpci; | |
590 | int err; | |
591 | ||
592 | err = __rpc_create_common(dir, dentry, S_IFIFO | mode, i_fop, private); | |
593 | if (err) | |
594 | return err; | |
595 | rpci = RPC_I(dentry->d_inode); | |
596 | rpci->nkern_readwriters = 1; | |
597 | rpci->private = private; | |
598 | rpci->flags = flags; | |
599 | rpci->ops = ops; | |
600 | fsnotify_create(dir, dentry); | |
601 | return 0; | |
602 | } | |
603 | ||
1da177e4 LT |
604 | /* |
605 | * FIXME: This probably has races. | |
606 | */ | |
9b45b74c CL |
607 | static void rpc_depopulate(struct dentry *parent, |
608 | unsigned long start, unsigned long eof) | |
1da177e4 LT |
609 | { |
610 | struct inode *dir = parent->d_inode; | |
611 | struct list_head *pos, *next; | |
612 | struct dentry *dentry, *dvec[10]; | |
613 | int n = 0; | |
614 | ||
c6573c29 | 615 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_CHILD); |
1da177e4 LT |
616 | repeat: |
617 | spin_lock(&dcache_lock); | |
618 | list_for_each_safe(pos, next, &parent->d_subdirs) { | |
5160ee6f | 619 | dentry = list_entry(pos, struct dentry, d_u.d_child); |
62e1761c TM |
620 | if (!dentry->d_inode || |
621 | dentry->d_inode->i_ino < start || | |
622 | dentry->d_inode->i_ino >= eof) | |
623 | continue; | |
1da177e4 LT |
624 | spin_lock(&dentry->d_lock); |
625 | if (!d_unhashed(dentry)) { | |
626 | dget_locked(dentry); | |
627 | __d_drop(dentry); | |
628 | spin_unlock(&dentry->d_lock); | |
629 | dvec[n++] = dentry; | |
630 | if (n == ARRAY_SIZE(dvec)) | |
631 | break; | |
632 | } else | |
633 | spin_unlock(&dentry->d_lock); | |
634 | } | |
635 | spin_unlock(&dcache_lock); | |
636 | if (n) { | |
637 | do { | |
638 | dentry = dvec[--n]; | |
62e1761c | 639 | if (S_ISREG(dentry->d_inode->i_mode)) |
1da177e4 | 640 | simple_unlink(dir, dentry); |
62e1761c TM |
641 | else if (S_ISDIR(dentry->d_inode->i_mode)) |
642 | simple_rmdir(dir, dentry); | |
643 | d_delete(dentry); | |
1da177e4 LT |
644 | dput(dentry); |
645 | } while (n); | |
646 | goto repeat; | |
647 | } | |
1b1dcc1b | 648 | mutex_unlock(&dir->i_mutex); |
1da177e4 LT |
649 | } |
650 | ||
651 | static int | |
652 | rpc_populate(struct dentry *parent, | |
653 | struct rpc_filelist *files, | |
654 | int start, int eof) | |
655 | { | |
656 | struct inode *inode, *dir = parent->d_inode; | |
657 | void *private = RPC_I(dir)->private; | |
658 | struct dentry *dentry; | |
7364af6a TM |
659 | umode_t mode; |
660 | int i; | |
1da177e4 | 661 | |
1b1dcc1b | 662 | mutex_lock(&dir->i_mutex); |
1da177e4 LT |
663 | for (i = start; i < eof; i++) { |
664 | dentry = d_alloc_name(parent, files[i].name); | |
665 | if (!dentry) | |
666 | goto out_bad; | |
62e1761c | 667 | dentry->d_op = &rpc_dentry_operations; |
1da177e4 LT |
668 | mode = files[i].mode; |
669 | inode = rpc_get_inode(dir->i_sb, mode); | |
670 | if (!inode) { | |
671 | dput(dentry); | |
672 | goto out_bad; | |
673 | } | |
674 | inode->i_ino = i; | |
675 | if (files[i].i_fop) | |
676 | inode->i_fop = files[i].i_fop; | |
677 | if (private) | |
678 | rpc_inode_setowner(inode, private); | |
679 | if (S_ISDIR(mode)) | |
d8c76e6f | 680 | inc_nlink(dir); |
1da177e4 | 681 | d_add(dentry, inode); |
50e437d5 | 682 | fsnotify_create(dir, dentry); |
1da177e4 | 683 | } |
1b1dcc1b | 684 | mutex_unlock(&dir->i_mutex); |
1da177e4 LT |
685 | return 0; |
686 | out_bad: | |
1b1dcc1b | 687 | mutex_unlock(&dir->i_mutex); |
1da177e4 | 688 | printk(KERN_WARNING "%s: %s failed to populate directory %s\n", |
0dc47877 | 689 | __FILE__, __func__, parent->d_name.name); |
1da177e4 LT |
690 | return -ENOMEM; |
691 | } | |
692 | ||
f134585a TM |
693 | static int |
694 | __rpc_rmdir(struct inode *dir, struct dentry *dentry) | |
695 | { | |
1da177e4 | 696 | int error; |
62e1761c TM |
697 | error = simple_rmdir(dir, dentry); |
698 | if (!error) | |
699 | d_delete(dentry); | |
700 | return error; | |
f134585a | 701 | } |
1da177e4 | 702 | |
f134585a | 703 | static struct dentry * |
34f30896 | 704 | rpc_lookup_create(struct dentry *parent, const char *name, int len, int exclusive) |
f134585a | 705 | { |
158998b6 | 706 | struct inode *dir = parent->d_inode; |
f134585a | 707 | struct dentry *dentry; |
278c995c | 708 | |
c6573c29 | 709 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); |
158998b6 | 710 | dentry = lookup_one_len(name, parent, len); |
1da177e4 | 711 | if (IS_ERR(dentry)) |
f134585a | 712 | goto out_err; |
62e1761c TM |
713 | if (!dentry->d_inode) |
714 | dentry->d_op = &rpc_dentry_operations; | |
715 | else if (exclusive) { | |
f134585a | 716 | dput(dentry); |
1da177e4 | 717 | dentry = ERR_PTR(-EEXIST); |
f134585a | 718 | goto out_err; |
1da177e4 | 719 | } |
f134585a TM |
720 | return dentry; |
721 | out_err: | |
1b1dcc1b | 722 | mutex_unlock(&dir->i_mutex); |
158998b6 TM |
723 | return dentry; |
724 | } | |
725 | ||
726 | static struct dentry * | |
727 | rpc_lookup_negative(char *path, struct nameidata *nd) | |
728 | { | |
729 | struct dentry *dentry; | |
730 | int error; | |
731 | ||
732 | if ((error = rpc_lookup_parent(path, nd)) != 0) | |
733 | return ERR_PTR(error); | |
4ac91378 JB |
734 | dentry = rpc_lookup_create(nd->path.dentry, nd->last.name, nd->last.len, |
735 | 1); | |
158998b6 TM |
736 | if (IS_ERR(dentry)) |
737 | rpc_release_path(nd); | |
f134585a TM |
738 | return dentry; |
739 | } | |
278c995c | 740 | |
93a44a75 BF |
741 | /** |
742 | * rpc_mkdir - Create a new directory in rpc_pipefs | |
743 | * @path: path from the rpc_pipefs root to the new directory | |
65b6e42c | 744 | * @rpc_client: rpc client to associate with this directory |
93a44a75 BF |
745 | * |
746 | * This creates a directory at the given @path associated with | |
747 | * @rpc_clnt, which will contain a file named "info" with some basic | |
748 | * information about the client, together with any "pipes" that may | |
749 | * later be created using rpc_mkpipe(). | |
750 | */ | |
f134585a TM |
751 | struct dentry * |
752 | rpc_mkdir(char *path, struct rpc_clnt *rpc_client) | |
753 | { | |
754 | struct nameidata nd; | |
755 | struct dentry *dentry; | |
756 | struct inode *dir; | |
757 | int error; | |
758 | ||
759 | dentry = rpc_lookup_negative(path, &nd); | |
760 | if (IS_ERR(dentry)) | |
761 | return dentry; | |
4ac91378 | 762 | dir = nd.path.dentry->d_inode; |
7589806e TM |
763 | error = __rpc_mkdir(dir, dentry, S_IRUGO | S_IXUGO, NULL, rpc_client); |
764 | if (error != 0) | |
765 | goto out_err; | |
1da177e4 LT |
766 | error = rpc_populate(dentry, authfiles, |
767 | RPCAUTH_info, RPCAUTH_EOF); | |
768 | if (error) | |
f134585a | 769 | goto err_depopulate; |
5c3e985a | 770 | dget(dentry); |
f134585a | 771 | out: |
1b1dcc1b | 772 | mutex_unlock(&dir->i_mutex); |
f134585a | 773 | rpc_release_path(&nd); |
5c3e985a | 774 | return dentry; |
f134585a | 775 | err_depopulate: |
62e1761c | 776 | rpc_depopulate(dentry, RPCAUTH_info, RPCAUTH_EOF); |
f134585a | 777 | __rpc_rmdir(dir, dentry); |
7589806e | 778 | out_err: |
f134585a | 779 | printk(KERN_WARNING "%s: %s() failed to create directory %s (errno = %d)\n", |
0dc47877 | 780 | __FILE__, __func__, path, error); |
f134585a TM |
781 | dentry = ERR_PTR(error); |
782 | goto out; | |
1da177e4 LT |
783 | } |
784 | ||
93a44a75 BF |
785 | /** |
786 | * rpc_rmdir - Remove a directory created with rpc_mkdir() | |
787 | * @dentry: directory to remove | |
788 | */ | |
f134585a | 789 | int |
dff02cc1 | 790 | rpc_rmdir(struct dentry *dentry) |
1da177e4 | 791 | { |
dff02cc1 | 792 | struct dentry *parent; |
f134585a TM |
793 | struct inode *dir; |
794 | int error; | |
278c995c | 795 | |
dff02cc1 TM |
796 | parent = dget_parent(dentry); |
797 | dir = parent->d_inode; | |
c6573c29 | 798 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); |
62e1761c | 799 | rpc_depopulate(dentry, RPCAUTH_info, RPCAUTH_EOF); |
f134585a TM |
800 | error = __rpc_rmdir(dir, dentry); |
801 | dput(dentry); | |
1b1dcc1b | 802 | mutex_unlock(&dir->i_mutex); |
dff02cc1 | 803 | dput(parent); |
f134585a | 804 | return error; |
1da177e4 LT |
805 | } |
806 | ||
93a44a75 BF |
807 | /** |
808 | * rpc_mkpipe - make an rpc_pipefs file for kernel<->userspace communication | |
809 | * @parent: dentry of directory to create new "pipe" in | |
810 | * @name: name of pipe | |
811 | * @private: private data to associate with the pipe, for the caller's use | |
812 | * @ops: operations defining the behavior of the pipe: upcall, downcall, | |
c3810608 | 813 | * release_pipe, open_pipe, and destroy_msg. |
65b6e42c | 814 | * @flags: rpc_inode flags |
93a44a75 BF |
815 | * |
816 | * Data is made available for userspace to read by calls to | |
817 | * rpc_queue_upcall(). The actual reads will result in calls to | |
818 | * @ops->upcall, which will be called with the file pointer, | |
819 | * message, and userspace buffer to copy to. | |
820 | * | |
821 | * Writes can come at any time, and do not necessarily have to be | |
822 | * responses to upcalls. They will result in calls to @msg->downcall. | |
823 | * | |
824 | * The @private argument passed here will be available to all these methods | |
825 | * from the file pointer, via RPC_I(file->f_dentry->d_inode)->private. | |
826 | */ | |
b693ba4a TM |
827 | struct dentry *rpc_mkpipe(struct dentry *parent, const char *name, |
828 | void *private, const struct rpc_pipe_ops *ops, | |
829 | int flags) | |
1da177e4 | 830 | { |
1da177e4 | 831 | struct dentry *dentry; |
7589806e | 832 | struct inode *dir = parent->d_inode; |
7364af6a | 833 | umode_t umode = S_IFIFO | S_IRUSR | S_IWUSR; |
7589806e | 834 | int err; |
7364af6a TM |
835 | |
836 | if (ops->upcall == NULL) | |
837 | umode &= ~S_IRUGO; | |
838 | if (ops->downcall == NULL) | |
839 | umode &= ~S_IWUGO; | |
1da177e4 | 840 | |
34f30896 | 841 | dentry = rpc_lookup_create(parent, name, strlen(name), 0); |
1da177e4 | 842 | if (IS_ERR(dentry)) |
f134585a | 843 | return dentry; |
158998b6 | 844 | dir = parent->d_inode; |
34f30896 | 845 | if (dentry->d_inode) { |
7589806e | 846 | struct rpc_inode *rpci = RPC_I(dentry->d_inode); |
34f30896 TM |
847 | if (rpci->private != private || |
848 | rpci->ops != ops || | |
849 | rpci->flags != flags) { | |
850 | dput (dentry); | |
851 | dentry = ERR_PTR(-EBUSY); | |
852 | } | |
03a1256f | 853 | rpci->nkern_readwriters++; |
34f30896 TM |
854 | goto out; |
855 | } | |
7589806e TM |
856 | |
857 | err = __rpc_mkpipe(dir, dentry, umode, &rpc_pipe_fops, | |
858 | private, ops, flags); | |
859 | if (err) | |
860 | goto out_err; | |
5c3e985a | 861 | dget(dentry); |
f134585a | 862 | out: |
1b1dcc1b | 863 | mutex_unlock(&dir->i_mutex); |
5c3e985a | 864 | return dentry; |
7589806e TM |
865 | out_err: |
866 | dentry = ERR_PTR(err); | |
158998b6 | 867 | printk(KERN_WARNING "%s: %s() failed to create pipe %s/%s (errno = %d)\n", |
0dc47877 | 868 | __FILE__, __func__, parent->d_name.name, name, |
7589806e | 869 | err); |
f134585a | 870 | goto out; |
1da177e4 | 871 | } |
468039ee | 872 | EXPORT_SYMBOL_GPL(rpc_mkpipe); |
1da177e4 | 873 | |
93a44a75 BF |
874 | /** |
875 | * rpc_unlink - remove a pipe | |
876 | * @dentry: dentry for the pipe, as returned from rpc_mkpipe | |
877 | * | |
878 | * After this call, lookups will no longer find the pipe, and any | |
879 | * attempts to read or write using preexisting opens of the pipe will | |
880 | * return -EPIPE. | |
881 | */ | |
f134585a | 882 | int |
5d67476f | 883 | rpc_unlink(struct dentry *dentry) |
1da177e4 | 884 | { |
5d67476f | 885 | struct dentry *parent; |
f134585a | 886 | struct inode *dir; |
5d67476f | 887 | int error = 0; |
1da177e4 | 888 | |
5d67476f TM |
889 | parent = dget_parent(dentry); |
890 | dir = parent->d_inode; | |
c6573c29 | 891 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); |
03a1256f TM |
892 | if (--RPC_I(dentry->d_inode)->nkern_readwriters == 0) { |
893 | rpc_close_pipes(dentry->d_inode); | |
894 | error = simple_unlink(dir, dentry); | |
895 | if (!error) | |
896 | d_delete(dentry); | |
897 | } | |
f134585a | 898 | dput(dentry); |
1b1dcc1b | 899 | mutex_unlock(&dir->i_mutex); |
5d67476f | 900 | dput(parent); |
f134585a | 901 | return error; |
1da177e4 | 902 | } |
468039ee | 903 | EXPORT_SYMBOL_GPL(rpc_unlink); |
1da177e4 LT |
904 | |
905 | /* | |
906 | * populate the filesystem | |
907 | */ | |
908 | static struct super_operations s_ops = { | |
909 | .alloc_inode = rpc_alloc_inode, | |
910 | .destroy_inode = rpc_destroy_inode, | |
911 | .statfs = simple_statfs, | |
912 | }; | |
913 | ||
914 | #define RPCAUTH_GSSMAGIC 0x67596969 | |
915 | ||
916 | static int | |
917 | rpc_fill_super(struct super_block *sb, void *data, int silent) | |
918 | { | |
919 | struct inode *inode; | |
920 | struct dentry *root; | |
921 | ||
922 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
923 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
924 | sb->s_magic = RPCAUTH_GSSMAGIC; | |
925 | sb->s_op = &s_ops; | |
926 | sb->s_time_gran = 1; | |
927 | ||
928 | inode = rpc_get_inode(sb, S_IFDIR | 0755); | |
929 | if (!inode) | |
930 | return -ENOMEM; | |
931 | root = d_alloc_root(inode); | |
932 | if (!root) { | |
933 | iput(inode); | |
934 | return -ENOMEM; | |
935 | } | |
936 | if (rpc_populate(root, files, RPCAUTH_Root + 1, RPCAUTH_RootEOF)) | |
937 | goto out; | |
938 | sb->s_root = root; | |
939 | return 0; | |
940 | out: | |
941 | d_genocide(root); | |
942 | dput(root); | |
943 | return -ENOMEM; | |
944 | } | |
945 | ||
454e2398 | 946 | static int |
1da177e4 | 947 | rpc_get_sb(struct file_system_type *fs_type, |
454e2398 | 948 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) |
1da177e4 | 949 | { |
454e2398 | 950 | return get_sb_single(fs_type, flags, data, rpc_fill_super, mnt); |
1da177e4 LT |
951 | } |
952 | ||
953 | static struct file_system_type rpc_pipe_fs_type = { | |
954 | .owner = THIS_MODULE, | |
955 | .name = "rpc_pipefs", | |
956 | .get_sb = rpc_get_sb, | |
957 | .kill_sb = kill_litter_super, | |
958 | }; | |
959 | ||
960 | static void | |
51cc5068 | 961 | init_once(void *foo) |
1da177e4 LT |
962 | { |
963 | struct rpc_inode *rpci = (struct rpc_inode *) foo; | |
964 | ||
a35afb83 CL |
965 | inode_init_once(&rpci->vfs_inode); |
966 | rpci->private = NULL; | |
967 | rpci->nreaders = 0; | |
968 | rpci->nwriters = 0; | |
969 | INIT_LIST_HEAD(&rpci->in_upcall); | |
6e84c7b6 | 970 | INIT_LIST_HEAD(&rpci->in_downcall); |
a35afb83 CL |
971 | INIT_LIST_HEAD(&rpci->pipe); |
972 | rpci->pipelen = 0; | |
973 | init_waitqueue_head(&rpci->waitq); | |
974 | INIT_DELAYED_WORK(&rpci->queue_timeout, | |
975 | rpc_timeout_upcall_queue); | |
976 | rpci->ops = NULL; | |
1da177e4 LT |
977 | } |
978 | ||
979 | int register_rpc_pipefs(void) | |
980 | { | |
5bd5f581 AM |
981 | int err; |
982 | ||
1da177e4 | 983 | rpc_inode_cachep = kmem_cache_create("rpc_inode_cache", |
fffb60f9 PJ |
984 | sizeof(struct rpc_inode), |
985 | 0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| | |
986 | SLAB_MEM_SPREAD), | |
20c2df83 | 987 | init_once); |
1da177e4 LT |
988 | if (!rpc_inode_cachep) |
989 | return -ENOMEM; | |
5bd5f581 AM |
990 | err = register_filesystem(&rpc_pipe_fs_type); |
991 | if (err) { | |
992 | kmem_cache_destroy(rpc_inode_cachep); | |
993 | return err; | |
994 | } | |
995 | ||
1da177e4 LT |
996 | return 0; |
997 | } | |
998 | ||
999 | void unregister_rpc_pipefs(void) | |
1000 | { | |
1a1d92c1 | 1001 | kmem_cache_destroy(rpc_inode_cachep); |
1da177e4 LT |
1002 | unregister_filesystem(&rpc_pipe_fs_type); |
1003 | } |