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 | } | |
a6eaf8bd | 116 | EXPORT_SYMBOL(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); | |
9842ef35 | 128 | struct rpc_pipe_ops *ops; |
1da177e4 | 129 | |
1b1dcc1b | 130 | mutex_lock(&inode->i_mutex); |
9842ef35 TM |
131 | ops = rpci->ops; |
132 | if (ops != NULL) { | |
133 | LIST_HEAD(free_list); | |
134 | ||
135 | spin_lock(&inode->i_lock); | |
1da177e4 | 136 | rpci->nreaders = 0; |
9842ef35 TM |
137 | list_splice_init(&rpci->in_upcall, &free_list); |
138 | list_splice_init(&rpci->pipe, &free_list); | |
139 | rpci->pipelen = 0; | |
1da177e4 | 140 | rpci->ops = NULL; |
9842ef35 TM |
141 | spin_unlock(&inode->i_lock); |
142 | rpc_purge_list(rpci, &free_list, ops->destroy_msg, -EPIPE); | |
143 | rpci->nwriters = 0; | |
144 | if (ops->release_pipe) | |
145 | ops->release_pipe(inode); | |
4011cd97 | 146 | cancel_delayed_work_sync(&rpci->queue_timeout); |
1da177e4 | 147 | } |
6070fe6f | 148 | rpc_inode_setowner(inode, NULL); |
1b1dcc1b | 149 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
150 | } |
151 | ||
1da177e4 LT |
152 | static struct inode * |
153 | rpc_alloc_inode(struct super_block *sb) | |
154 | { | |
155 | struct rpc_inode *rpci; | |
e94b1766 | 156 | rpci = (struct rpc_inode *)kmem_cache_alloc(rpc_inode_cachep, GFP_KERNEL); |
1da177e4 LT |
157 | if (!rpci) |
158 | return NULL; | |
159 | return &rpci->vfs_inode; | |
160 | } | |
161 | ||
162 | static void | |
163 | rpc_destroy_inode(struct inode *inode) | |
164 | { | |
165 | kmem_cache_free(rpc_inode_cachep, RPC_I(inode)); | |
166 | } | |
167 | ||
168 | static int | |
169 | rpc_pipe_open(struct inode *inode, struct file *filp) | |
170 | { | |
171 | struct rpc_inode *rpci = RPC_I(inode); | |
172 | int res = -ENXIO; | |
173 | ||
1b1dcc1b | 174 | mutex_lock(&inode->i_mutex); |
1da177e4 LT |
175 | if (rpci->ops != NULL) { |
176 | if (filp->f_mode & FMODE_READ) | |
177 | rpci->nreaders ++; | |
178 | if (filp->f_mode & FMODE_WRITE) | |
179 | rpci->nwriters ++; | |
180 | res = 0; | |
181 | } | |
1b1dcc1b | 182 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
183 | return res; |
184 | } | |
185 | ||
186 | static int | |
187 | rpc_pipe_release(struct inode *inode, struct file *filp) | |
188 | { | |
969b7f25 | 189 | struct rpc_inode *rpci = RPC_I(inode); |
1da177e4 LT |
190 | struct rpc_pipe_msg *msg; |
191 | ||
1b1dcc1b | 192 | mutex_lock(&inode->i_mutex); |
1da177e4 LT |
193 | if (rpci->ops == NULL) |
194 | goto out; | |
195 | msg = (struct rpc_pipe_msg *)filp->private_data; | |
196 | if (msg != NULL) { | |
9842ef35 | 197 | spin_lock(&inode->i_lock); |
48e49187 | 198 | msg->errno = -EAGAIN; |
9842ef35 TM |
199 | list_del(&msg->list); |
200 | spin_unlock(&inode->i_lock); | |
1da177e4 LT |
201 | rpci->ops->destroy_msg(msg); |
202 | } | |
203 | if (filp->f_mode & FMODE_WRITE) | |
204 | rpci->nwriters --; | |
9842ef35 | 205 | if (filp->f_mode & FMODE_READ) { |
1da177e4 | 206 | rpci->nreaders --; |
9842ef35 TM |
207 | if (rpci->nreaders == 0) { |
208 | LIST_HEAD(free_list); | |
209 | spin_lock(&inode->i_lock); | |
210 | list_splice_init(&rpci->pipe, &free_list); | |
211 | rpci->pipelen = 0; | |
212 | spin_unlock(&inode->i_lock); | |
213 | rpc_purge_list(rpci, &free_list, | |
214 | rpci->ops->destroy_msg, -EAGAIN); | |
215 | } | |
216 | } | |
1da177e4 LT |
217 | if (rpci->ops->release_pipe) |
218 | rpci->ops->release_pipe(inode); | |
219 | out: | |
1b1dcc1b | 220 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
221 | return 0; |
222 | } | |
223 | ||
224 | static ssize_t | |
225 | rpc_pipe_read(struct file *filp, char __user *buf, size_t len, loff_t *offset) | |
226 | { | |
303b46bb | 227 | struct inode *inode = filp->f_path.dentry->d_inode; |
1da177e4 LT |
228 | struct rpc_inode *rpci = RPC_I(inode); |
229 | struct rpc_pipe_msg *msg; | |
230 | int res = 0; | |
231 | ||
1b1dcc1b | 232 | mutex_lock(&inode->i_mutex); |
1da177e4 LT |
233 | if (rpci->ops == NULL) { |
234 | res = -EPIPE; | |
235 | goto out_unlock; | |
236 | } | |
237 | msg = filp->private_data; | |
238 | if (msg == NULL) { | |
9842ef35 | 239 | spin_lock(&inode->i_lock); |
1da177e4 LT |
240 | if (!list_empty(&rpci->pipe)) { |
241 | msg = list_entry(rpci->pipe.next, | |
242 | struct rpc_pipe_msg, | |
243 | list); | |
244 | list_move(&msg->list, &rpci->in_upcall); | |
245 | rpci->pipelen -= msg->len; | |
246 | filp->private_data = msg; | |
247 | msg->copied = 0; | |
248 | } | |
9842ef35 | 249 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
250 | if (msg == NULL) |
251 | goto out_unlock; | |
252 | } | |
253 | /* NOTE: it is up to the callback to update msg->copied */ | |
254 | res = rpci->ops->upcall(filp, msg, buf, len); | |
255 | if (res < 0 || msg->len == msg->copied) { | |
256 | filp->private_data = NULL; | |
9842ef35 TM |
257 | spin_lock(&inode->i_lock); |
258 | list_del(&msg->list); | |
259 | spin_unlock(&inode->i_lock); | |
1da177e4 LT |
260 | rpci->ops->destroy_msg(msg); |
261 | } | |
262 | out_unlock: | |
1b1dcc1b | 263 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
264 | return res; |
265 | } | |
266 | ||
267 | static ssize_t | |
268 | rpc_pipe_write(struct file *filp, const char __user *buf, size_t len, loff_t *offset) | |
269 | { | |
303b46bb | 270 | struct inode *inode = filp->f_path.dentry->d_inode; |
1da177e4 LT |
271 | struct rpc_inode *rpci = RPC_I(inode); |
272 | int res; | |
273 | ||
1b1dcc1b | 274 | mutex_lock(&inode->i_mutex); |
1da177e4 LT |
275 | res = -EPIPE; |
276 | if (rpci->ops != NULL) | |
277 | res = rpci->ops->downcall(filp, buf, len); | |
1b1dcc1b | 278 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
279 | return res; |
280 | } | |
281 | ||
282 | static unsigned int | |
283 | rpc_pipe_poll(struct file *filp, struct poll_table_struct *wait) | |
284 | { | |
285 | struct rpc_inode *rpci; | |
286 | unsigned int mask = 0; | |
287 | ||
303b46bb | 288 | rpci = RPC_I(filp->f_path.dentry->d_inode); |
1da177e4 LT |
289 | poll_wait(filp, &rpci->waitq, wait); |
290 | ||
291 | mask = POLLOUT | POLLWRNORM; | |
292 | if (rpci->ops == NULL) | |
293 | mask |= POLLERR | POLLHUP; | |
eda4f9b7 | 294 | if (filp->private_data || !list_empty(&rpci->pipe)) |
1da177e4 LT |
295 | mask |= POLLIN | POLLRDNORM; |
296 | return mask; | |
297 | } | |
298 | ||
299 | static int | |
300 | rpc_pipe_ioctl(struct inode *ino, struct file *filp, | |
301 | unsigned int cmd, unsigned long arg) | |
302 | { | |
303b46bb | 303 | struct rpc_inode *rpci = RPC_I(filp->f_path.dentry->d_inode); |
1da177e4 LT |
304 | int len; |
305 | ||
306 | switch (cmd) { | |
307 | case FIONREAD: | |
308 | if (rpci->ops == NULL) | |
309 | return -EPIPE; | |
310 | len = rpci->pipelen; | |
311 | if (filp->private_data) { | |
312 | struct rpc_pipe_msg *msg; | |
313 | msg = (struct rpc_pipe_msg *)filp->private_data; | |
314 | len += msg->len - msg->copied; | |
315 | } | |
316 | return put_user(len, (int __user *)arg); | |
317 | default: | |
318 | return -EINVAL; | |
319 | } | |
320 | } | |
321 | ||
da7071d7 | 322 | static const struct file_operations rpc_pipe_fops = { |
1da177e4 LT |
323 | .owner = THIS_MODULE, |
324 | .llseek = no_llseek, | |
325 | .read = rpc_pipe_read, | |
326 | .write = rpc_pipe_write, | |
327 | .poll = rpc_pipe_poll, | |
328 | .ioctl = rpc_pipe_ioctl, | |
329 | .open = rpc_pipe_open, | |
330 | .release = rpc_pipe_release, | |
331 | }; | |
332 | ||
333 | static int | |
334 | rpc_show_info(struct seq_file *m, void *v) | |
335 | { | |
336 | struct rpc_clnt *clnt = m->private; | |
337 | ||
338 | seq_printf(m, "RPC server: %s\n", clnt->cl_server); | |
339 | seq_printf(m, "service: %s (%d) version %d\n", clnt->cl_protname, | |
340 | clnt->cl_prog, clnt->cl_vers); | |
e7f78657 CL |
341 | seq_printf(m, "address: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_ADDR)); |
342 | seq_printf(m, "protocol: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PROTO)); | |
bf19aace | 343 | seq_printf(m, "port: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PORT)); |
1da177e4 LT |
344 | return 0; |
345 | } | |
346 | ||
347 | static int | |
348 | rpc_info_open(struct inode *inode, struct file *file) | |
349 | { | |
350 | struct rpc_clnt *clnt; | |
351 | int ret = single_open(file, rpc_show_info, NULL); | |
352 | ||
353 | if (!ret) { | |
354 | struct seq_file *m = file->private_data; | |
1b1dcc1b | 355 | mutex_lock(&inode->i_mutex); |
1da177e4 LT |
356 | clnt = RPC_I(inode)->private; |
357 | if (clnt) { | |
34f52e35 | 358 | kref_get(&clnt->cl_kref); |
1da177e4 LT |
359 | m->private = clnt; |
360 | } else { | |
361 | single_release(inode, file); | |
362 | ret = -EINVAL; | |
363 | } | |
1b1dcc1b | 364 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
365 | } |
366 | return ret; | |
367 | } | |
368 | ||
369 | static int | |
370 | rpc_info_release(struct inode *inode, struct file *file) | |
371 | { | |
372 | struct seq_file *m = file->private_data; | |
373 | struct rpc_clnt *clnt = (struct rpc_clnt *)m->private; | |
374 | ||
375 | if (clnt) | |
376 | rpc_release_client(clnt); | |
377 | return single_release(inode, file); | |
378 | } | |
379 | ||
da7071d7 | 380 | static const struct file_operations rpc_info_operations = { |
1da177e4 LT |
381 | .owner = THIS_MODULE, |
382 | .open = rpc_info_open, | |
383 | .read = seq_read, | |
384 | .llseek = seq_lseek, | |
385 | .release = rpc_info_release, | |
386 | }; | |
387 | ||
388 | ||
389 | /* | |
390 | * We have a single directory with 1 node in it. | |
391 | */ | |
392 | enum { | |
393 | RPCAUTH_Root = 1, | |
394 | RPCAUTH_lockd, | |
395 | RPCAUTH_mount, | |
396 | RPCAUTH_nfs, | |
397 | RPCAUTH_portmap, | |
398 | RPCAUTH_statd, | |
399 | RPCAUTH_RootEOF | |
400 | }; | |
401 | ||
402 | /* | |
403 | * Description of fs contents. | |
404 | */ | |
405 | struct rpc_filelist { | |
406 | char *name; | |
99ac48f5 | 407 | const struct file_operations *i_fop; |
1da177e4 LT |
408 | int mode; |
409 | }; | |
410 | ||
411 | static struct rpc_filelist files[] = { | |
412 | [RPCAUTH_lockd] = { | |
413 | .name = "lockd", | |
414 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
415 | }, | |
416 | [RPCAUTH_mount] = { | |
417 | .name = "mount", | |
418 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
419 | }, | |
420 | [RPCAUTH_nfs] = { | |
421 | .name = "nfs", | |
422 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
423 | }, | |
424 | [RPCAUTH_portmap] = { | |
425 | .name = "portmap", | |
426 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
427 | }, | |
428 | [RPCAUTH_statd] = { | |
429 | .name = "statd", | |
430 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
431 | }, | |
432 | }; | |
433 | ||
434 | enum { | |
435 | RPCAUTH_info = 2, | |
436 | RPCAUTH_EOF | |
437 | }; | |
438 | ||
439 | static struct rpc_filelist authfiles[] = { | |
440 | [RPCAUTH_info] = { | |
441 | .name = "info", | |
442 | .i_fop = &rpc_info_operations, | |
443 | .mode = S_IFREG | S_IRUSR, | |
444 | }, | |
445 | }; | |
446 | ||
54281548 | 447 | struct vfsmount *rpc_get_mount(void) |
1da177e4 | 448 | { |
54281548 TM |
449 | int err; |
450 | ||
1f5ce9e9 | 451 | err = simple_pin_fs(&rpc_pipe_fs_type, &rpc_mount, &rpc_mount_count); |
54281548 TM |
452 | if (err != 0) |
453 | return ERR_PTR(err); | |
454 | return rpc_mount; | |
1da177e4 LT |
455 | } |
456 | ||
54281548 | 457 | void rpc_put_mount(void) |
1da177e4 LT |
458 | { |
459 | simple_release_fs(&rpc_mount, &rpc_mount_count); | |
460 | } | |
461 | ||
62e1761c TM |
462 | static int rpc_delete_dentry(struct dentry *dentry) |
463 | { | |
464 | return 1; | |
465 | } | |
466 | ||
467 | static struct dentry_operations rpc_dentry_operations = { | |
468 | .d_delete = rpc_delete_dentry, | |
469 | }; | |
470 | ||
f134585a TM |
471 | static int |
472 | rpc_lookup_parent(char *path, struct nameidata *nd) | |
473 | { | |
4ac4efc1 JJS |
474 | struct vfsmount *mnt; |
475 | ||
f134585a TM |
476 | if (path[0] == '\0') |
477 | return -ENOENT; | |
4ac4efc1 JJS |
478 | |
479 | mnt = rpc_get_mount(); | |
480 | if (IS_ERR(mnt)) { | |
f134585a TM |
481 | printk(KERN_WARNING "%s: %s failed to mount " |
482 | "pseudofilesystem \n", __FILE__, __FUNCTION__); | |
4ac4efc1 | 483 | return PTR_ERR(mnt); |
f134585a | 484 | } |
f134585a | 485 | |
4ac4efc1 | 486 | if (vfs_path_lookup(mnt->mnt_root, mnt, path, LOOKUP_PARENT, nd)) { |
f134585a TM |
487 | printk(KERN_WARNING "%s: %s failed to find path %s\n", |
488 | __FILE__, __FUNCTION__, path); | |
489 | rpc_put_mount(); | |
490 | return -ENOENT; | |
491 | } | |
492 | return 0; | |
493 | } | |
494 | ||
495 | static void | |
496 | rpc_release_path(struct nameidata *nd) | |
497 | { | |
498 | path_release(nd); | |
499 | rpc_put_mount(); | |
500 | } | |
501 | ||
1da177e4 LT |
502 | static struct inode * |
503 | rpc_get_inode(struct super_block *sb, int mode) | |
504 | { | |
505 | struct inode *inode = new_inode(sb); | |
506 | if (!inode) | |
507 | return NULL; | |
508 | inode->i_mode = mode; | |
509 | inode->i_uid = inode->i_gid = 0; | |
1da177e4 LT |
510 | inode->i_blocks = 0; |
511 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
512 | switch(mode & S_IFMT) { | |
513 | case S_IFDIR: | |
514 | inode->i_fop = &simple_dir_operations; | |
515 | inode->i_op = &simple_dir_inode_operations; | |
d8c76e6f | 516 | inc_nlink(inode); |
1da177e4 LT |
517 | default: |
518 | break; | |
519 | } | |
520 | return inode; | |
521 | } | |
522 | ||
523 | /* | |
524 | * FIXME: This probably has races. | |
525 | */ | |
9b45b74c CL |
526 | static void rpc_depopulate(struct dentry *parent, |
527 | unsigned long start, unsigned long eof) | |
1da177e4 LT |
528 | { |
529 | struct inode *dir = parent->d_inode; | |
530 | struct list_head *pos, *next; | |
531 | struct dentry *dentry, *dvec[10]; | |
532 | int n = 0; | |
533 | ||
c6573c29 | 534 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_CHILD); |
1da177e4 LT |
535 | repeat: |
536 | spin_lock(&dcache_lock); | |
537 | list_for_each_safe(pos, next, &parent->d_subdirs) { | |
5160ee6f | 538 | dentry = list_entry(pos, struct dentry, d_u.d_child); |
62e1761c TM |
539 | if (!dentry->d_inode || |
540 | dentry->d_inode->i_ino < start || | |
541 | dentry->d_inode->i_ino >= eof) | |
542 | continue; | |
1da177e4 LT |
543 | spin_lock(&dentry->d_lock); |
544 | if (!d_unhashed(dentry)) { | |
545 | dget_locked(dentry); | |
546 | __d_drop(dentry); | |
547 | spin_unlock(&dentry->d_lock); | |
548 | dvec[n++] = dentry; | |
549 | if (n == ARRAY_SIZE(dvec)) | |
550 | break; | |
551 | } else | |
552 | spin_unlock(&dentry->d_lock); | |
553 | } | |
554 | spin_unlock(&dcache_lock); | |
555 | if (n) { | |
556 | do { | |
557 | dentry = dvec[--n]; | |
62e1761c | 558 | if (S_ISREG(dentry->d_inode->i_mode)) |
1da177e4 | 559 | simple_unlink(dir, dentry); |
62e1761c TM |
560 | else if (S_ISDIR(dentry->d_inode->i_mode)) |
561 | simple_rmdir(dir, dentry); | |
562 | d_delete(dentry); | |
1da177e4 LT |
563 | dput(dentry); |
564 | } while (n); | |
565 | goto repeat; | |
566 | } | |
1b1dcc1b | 567 | mutex_unlock(&dir->i_mutex); |
1da177e4 LT |
568 | } |
569 | ||
570 | static int | |
571 | rpc_populate(struct dentry *parent, | |
572 | struct rpc_filelist *files, | |
573 | int start, int eof) | |
574 | { | |
575 | struct inode *inode, *dir = parent->d_inode; | |
576 | void *private = RPC_I(dir)->private; | |
577 | struct dentry *dentry; | |
578 | int mode, i; | |
579 | ||
1b1dcc1b | 580 | mutex_lock(&dir->i_mutex); |
1da177e4 LT |
581 | for (i = start; i < eof; i++) { |
582 | dentry = d_alloc_name(parent, files[i].name); | |
583 | if (!dentry) | |
584 | goto out_bad; | |
62e1761c | 585 | dentry->d_op = &rpc_dentry_operations; |
1da177e4 LT |
586 | mode = files[i].mode; |
587 | inode = rpc_get_inode(dir->i_sb, mode); | |
588 | if (!inode) { | |
589 | dput(dentry); | |
590 | goto out_bad; | |
591 | } | |
592 | inode->i_ino = i; | |
593 | if (files[i].i_fop) | |
594 | inode->i_fop = files[i].i_fop; | |
595 | if (private) | |
596 | rpc_inode_setowner(inode, private); | |
597 | if (S_ISDIR(mode)) | |
d8c76e6f | 598 | inc_nlink(dir); |
1da177e4 | 599 | d_add(dentry, inode); |
50e437d5 | 600 | fsnotify_create(dir, dentry); |
1da177e4 | 601 | } |
1b1dcc1b | 602 | mutex_unlock(&dir->i_mutex); |
1da177e4 LT |
603 | return 0; |
604 | out_bad: | |
1b1dcc1b | 605 | mutex_unlock(&dir->i_mutex); |
1da177e4 LT |
606 | printk(KERN_WARNING "%s: %s failed to populate directory %s\n", |
607 | __FILE__, __FUNCTION__, parent->d_name.name); | |
608 | return -ENOMEM; | |
609 | } | |
610 | ||
f134585a TM |
611 | static int |
612 | __rpc_mkdir(struct inode *dir, struct dentry *dentry) | |
1da177e4 LT |
613 | { |
614 | struct inode *inode; | |
f134585a | 615 | |
1d21632d | 616 | inode = rpc_get_inode(dir->i_sb, S_IFDIR | S_IRUGO | S_IXUGO); |
f134585a TM |
617 | if (!inode) |
618 | goto out_err; | |
619 | inode->i_ino = iunique(dir->i_sb, 100); | |
620 | d_instantiate(dentry, inode); | |
d8c76e6f | 621 | inc_nlink(dir); |
50e437d5 | 622 | fsnotify_mkdir(dir, dentry); |
f134585a TM |
623 | return 0; |
624 | out_err: | |
625 | printk(KERN_WARNING "%s: %s failed to allocate inode for dentry %s\n", | |
626 | __FILE__, __FUNCTION__, dentry->d_name.name); | |
627 | return -ENOMEM; | |
628 | } | |
629 | ||
630 | static int | |
631 | __rpc_rmdir(struct inode *dir, struct dentry *dentry) | |
632 | { | |
1da177e4 | 633 | int error; |
62e1761c TM |
634 | error = simple_rmdir(dir, dentry); |
635 | if (!error) | |
636 | d_delete(dentry); | |
637 | return error; | |
f134585a | 638 | } |
1da177e4 | 639 | |
f134585a | 640 | static struct dentry * |
34f30896 | 641 | rpc_lookup_create(struct dentry *parent, const char *name, int len, int exclusive) |
f134585a | 642 | { |
158998b6 | 643 | struct inode *dir = parent->d_inode; |
f134585a | 644 | struct dentry *dentry; |
278c995c | 645 | |
c6573c29 | 646 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); |
158998b6 | 647 | dentry = lookup_one_len(name, parent, len); |
1da177e4 | 648 | if (IS_ERR(dentry)) |
f134585a | 649 | goto out_err; |
62e1761c TM |
650 | if (!dentry->d_inode) |
651 | dentry->d_op = &rpc_dentry_operations; | |
652 | else if (exclusive) { | |
f134585a | 653 | dput(dentry); |
1da177e4 | 654 | dentry = ERR_PTR(-EEXIST); |
f134585a | 655 | goto out_err; |
1da177e4 | 656 | } |
f134585a TM |
657 | return dentry; |
658 | out_err: | |
1b1dcc1b | 659 | mutex_unlock(&dir->i_mutex); |
158998b6 TM |
660 | return dentry; |
661 | } | |
662 | ||
663 | static struct dentry * | |
664 | rpc_lookup_negative(char *path, struct nameidata *nd) | |
665 | { | |
666 | struct dentry *dentry; | |
667 | int error; | |
668 | ||
669 | if ((error = rpc_lookup_parent(path, nd)) != 0) | |
670 | return ERR_PTR(error); | |
34f30896 | 671 | dentry = rpc_lookup_create(nd->dentry, nd->last.name, nd->last.len, 1); |
158998b6 TM |
672 | if (IS_ERR(dentry)) |
673 | rpc_release_path(nd); | |
f134585a TM |
674 | return dentry; |
675 | } | |
278c995c | 676 | |
93a44a75 BF |
677 | /** |
678 | * rpc_mkdir - Create a new directory in rpc_pipefs | |
679 | * @path: path from the rpc_pipefs root to the new directory | |
680 | * @rpc_clnt: rpc client to associate with this directory | |
681 | * | |
682 | * This creates a directory at the given @path associated with | |
683 | * @rpc_clnt, which will contain a file named "info" with some basic | |
684 | * information about the client, together with any "pipes" that may | |
685 | * later be created using rpc_mkpipe(). | |
686 | */ | |
f134585a TM |
687 | struct dentry * |
688 | rpc_mkdir(char *path, struct rpc_clnt *rpc_client) | |
689 | { | |
690 | struct nameidata nd; | |
691 | struct dentry *dentry; | |
692 | struct inode *dir; | |
693 | int error; | |
694 | ||
695 | dentry = rpc_lookup_negative(path, &nd); | |
696 | if (IS_ERR(dentry)) | |
697 | return dentry; | |
698 | dir = nd.dentry->d_inode; | |
699 | if ((error = __rpc_mkdir(dir, dentry)) != 0) | |
700 | goto err_dput; | |
701 | RPC_I(dentry->d_inode)->private = rpc_client; | |
1da177e4 LT |
702 | error = rpc_populate(dentry, authfiles, |
703 | RPCAUTH_info, RPCAUTH_EOF); | |
704 | if (error) | |
f134585a | 705 | goto err_depopulate; |
5c3e985a | 706 | dget(dentry); |
f134585a | 707 | out: |
1b1dcc1b | 708 | mutex_unlock(&dir->i_mutex); |
f134585a | 709 | rpc_release_path(&nd); |
5c3e985a | 710 | return dentry; |
f134585a | 711 | err_depopulate: |
62e1761c | 712 | rpc_depopulate(dentry, RPCAUTH_info, RPCAUTH_EOF); |
f134585a TM |
713 | __rpc_rmdir(dir, dentry); |
714 | err_dput: | |
715 | dput(dentry); | |
716 | printk(KERN_WARNING "%s: %s() failed to create directory %s (errno = %d)\n", | |
717 | __FILE__, __FUNCTION__, path, error); | |
718 | dentry = ERR_PTR(error); | |
719 | goto out; | |
1da177e4 LT |
720 | } |
721 | ||
93a44a75 BF |
722 | /** |
723 | * rpc_rmdir - Remove a directory created with rpc_mkdir() | |
724 | * @dentry: directory to remove | |
725 | */ | |
f134585a | 726 | int |
dff02cc1 | 727 | rpc_rmdir(struct dentry *dentry) |
1da177e4 | 728 | { |
dff02cc1 | 729 | struct dentry *parent; |
f134585a TM |
730 | struct inode *dir; |
731 | int error; | |
278c995c | 732 | |
dff02cc1 TM |
733 | parent = dget_parent(dentry); |
734 | dir = parent->d_inode; | |
c6573c29 | 735 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); |
62e1761c | 736 | rpc_depopulate(dentry, RPCAUTH_info, RPCAUTH_EOF); |
f134585a TM |
737 | error = __rpc_rmdir(dir, dentry); |
738 | dput(dentry); | |
1b1dcc1b | 739 | mutex_unlock(&dir->i_mutex); |
dff02cc1 | 740 | dput(parent); |
f134585a | 741 | return error; |
1da177e4 LT |
742 | } |
743 | ||
93a44a75 BF |
744 | /** |
745 | * rpc_mkpipe - make an rpc_pipefs file for kernel<->userspace communication | |
746 | * @parent: dentry of directory to create new "pipe" in | |
747 | * @name: name of pipe | |
748 | * @private: private data to associate with the pipe, for the caller's use | |
749 | * @ops: operations defining the behavior of the pipe: upcall, downcall, | |
750 | * release_pipe, and destroy_msg. | |
751 | * | |
752 | * Data is made available for userspace to read by calls to | |
753 | * rpc_queue_upcall(). The actual reads will result in calls to | |
754 | * @ops->upcall, which will be called with the file pointer, | |
755 | * message, and userspace buffer to copy to. | |
756 | * | |
757 | * Writes can come at any time, and do not necessarily have to be | |
758 | * responses to upcalls. They will result in calls to @msg->downcall. | |
759 | * | |
760 | * The @private argument passed here will be available to all these methods | |
761 | * from the file pointer, via RPC_I(file->f_dentry->d_inode)->private. | |
762 | */ | |
1da177e4 | 763 | struct dentry * |
158998b6 | 764 | rpc_mkpipe(struct dentry *parent, const char *name, void *private, struct rpc_pipe_ops *ops, int flags) |
1da177e4 | 765 | { |
1da177e4 | 766 | struct dentry *dentry; |
f134585a | 767 | struct inode *dir, *inode; |
1da177e4 LT |
768 | struct rpc_inode *rpci; |
769 | ||
34f30896 | 770 | dentry = rpc_lookup_create(parent, name, strlen(name), 0); |
1da177e4 | 771 | if (IS_ERR(dentry)) |
f134585a | 772 | return dentry; |
158998b6 | 773 | dir = parent->d_inode; |
34f30896 TM |
774 | if (dentry->d_inode) { |
775 | rpci = RPC_I(dentry->d_inode); | |
776 | if (rpci->private != private || | |
777 | rpci->ops != ops || | |
778 | rpci->flags != flags) { | |
779 | dput (dentry); | |
780 | dentry = ERR_PTR(-EBUSY); | |
781 | } | |
03a1256f | 782 | rpci->nkern_readwriters++; |
34f30896 TM |
783 | goto out; |
784 | } | |
a53a3c58 | 785 | inode = rpc_get_inode(dir->i_sb, S_IFIFO | S_IRUSR | S_IWUSR); |
f134585a TM |
786 | if (!inode) |
787 | goto err_dput; | |
1da177e4 LT |
788 | inode->i_ino = iunique(dir->i_sb, 100); |
789 | inode->i_fop = &rpc_pipe_fops; | |
f134585a | 790 | d_instantiate(dentry, inode); |
1da177e4 LT |
791 | rpci = RPC_I(inode); |
792 | rpci->private = private; | |
793 | rpci->flags = flags; | |
794 | rpci->ops = ops; | |
03a1256f | 795 | rpci->nkern_readwriters = 1; |
50e437d5 | 796 | fsnotify_create(dir, dentry); |
5c3e985a | 797 | dget(dentry); |
f134585a | 798 | out: |
1b1dcc1b | 799 | mutex_unlock(&dir->i_mutex); |
5c3e985a | 800 | return dentry; |
f134585a | 801 | err_dput: |
1da177e4 | 802 | dput(dentry); |
f134585a | 803 | dentry = ERR_PTR(-ENOMEM); |
158998b6 TM |
804 | printk(KERN_WARNING "%s: %s() failed to create pipe %s/%s (errno = %d)\n", |
805 | __FILE__, __FUNCTION__, parent->d_name.name, name, | |
806 | -ENOMEM); | |
f134585a | 807 | goto out; |
1da177e4 | 808 | } |
a6eaf8bd | 809 | EXPORT_SYMBOL(rpc_mkpipe); |
1da177e4 | 810 | |
93a44a75 BF |
811 | /** |
812 | * rpc_unlink - remove a pipe | |
813 | * @dentry: dentry for the pipe, as returned from rpc_mkpipe | |
814 | * | |
815 | * After this call, lookups will no longer find the pipe, and any | |
816 | * attempts to read or write using preexisting opens of the pipe will | |
817 | * return -EPIPE. | |
818 | */ | |
f134585a | 819 | int |
5d67476f | 820 | rpc_unlink(struct dentry *dentry) |
1da177e4 | 821 | { |
5d67476f | 822 | struct dentry *parent; |
f134585a | 823 | struct inode *dir; |
5d67476f | 824 | int error = 0; |
1da177e4 | 825 | |
5d67476f TM |
826 | parent = dget_parent(dentry); |
827 | dir = parent->d_inode; | |
c6573c29 | 828 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); |
03a1256f TM |
829 | if (--RPC_I(dentry->d_inode)->nkern_readwriters == 0) { |
830 | rpc_close_pipes(dentry->d_inode); | |
831 | error = simple_unlink(dir, dentry); | |
832 | if (!error) | |
833 | d_delete(dentry); | |
834 | } | |
f134585a | 835 | dput(dentry); |
1b1dcc1b | 836 | mutex_unlock(&dir->i_mutex); |
5d67476f | 837 | dput(parent); |
f134585a | 838 | return error; |
1da177e4 | 839 | } |
a6eaf8bd | 840 | EXPORT_SYMBOL(rpc_unlink); |
1da177e4 LT |
841 | |
842 | /* | |
843 | * populate the filesystem | |
844 | */ | |
845 | static struct super_operations s_ops = { | |
846 | .alloc_inode = rpc_alloc_inode, | |
847 | .destroy_inode = rpc_destroy_inode, | |
848 | .statfs = simple_statfs, | |
849 | }; | |
850 | ||
851 | #define RPCAUTH_GSSMAGIC 0x67596969 | |
852 | ||
853 | static int | |
854 | rpc_fill_super(struct super_block *sb, void *data, int silent) | |
855 | { | |
856 | struct inode *inode; | |
857 | struct dentry *root; | |
858 | ||
859 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
860 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
861 | sb->s_magic = RPCAUTH_GSSMAGIC; | |
862 | sb->s_op = &s_ops; | |
863 | sb->s_time_gran = 1; | |
864 | ||
865 | inode = rpc_get_inode(sb, S_IFDIR | 0755); | |
866 | if (!inode) | |
867 | return -ENOMEM; | |
868 | root = d_alloc_root(inode); | |
869 | if (!root) { | |
870 | iput(inode); | |
871 | return -ENOMEM; | |
872 | } | |
873 | if (rpc_populate(root, files, RPCAUTH_Root + 1, RPCAUTH_RootEOF)) | |
874 | goto out; | |
875 | sb->s_root = root; | |
876 | return 0; | |
877 | out: | |
878 | d_genocide(root); | |
879 | dput(root); | |
880 | return -ENOMEM; | |
881 | } | |
882 | ||
454e2398 | 883 | static int |
1da177e4 | 884 | rpc_get_sb(struct file_system_type *fs_type, |
454e2398 | 885 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) |
1da177e4 | 886 | { |
454e2398 | 887 | return get_sb_single(fs_type, flags, data, rpc_fill_super, mnt); |
1da177e4 LT |
888 | } |
889 | ||
890 | static struct file_system_type rpc_pipe_fs_type = { | |
891 | .owner = THIS_MODULE, | |
892 | .name = "rpc_pipefs", | |
893 | .get_sb = rpc_get_sb, | |
894 | .kill_sb = kill_litter_super, | |
895 | }; | |
896 | ||
897 | static void | |
4ba9b9d0 | 898 | init_once(struct kmem_cache * cachep, void *foo) |
1da177e4 LT |
899 | { |
900 | struct rpc_inode *rpci = (struct rpc_inode *) foo; | |
901 | ||
a35afb83 CL |
902 | inode_init_once(&rpci->vfs_inode); |
903 | rpci->private = NULL; | |
904 | rpci->nreaders = 0; | |
905 | rpci->nwriters = 0; | |
906 | INIT_LIST_HEAD(&rpci->in_upcall); | |
6e84c7b6 | 907 | INIT_LIST_HEAD(&rpci->in_downcall); |
a35afb83 CL |
908 | INIT_LIST_HEAD(&rpci->pipe); |
909 | rpci->pipelen = 0; | |
910 | init_waitqueue_head(&rpci->waitq); | |
911 | INIT_DELAYED_WORK(&rpci->queue_timeout, | |
912 | rpc_timeout_upcall_queue); | |
913 | rpci->ops = NULL; | |
1da177e4 LT |
914 | } |
915 | ||
916 | int register_rpc_pipefs(void) | |
917 | { | |
5bd5f581 AM |
918 | int err; |
919 | ||
1da177e4 | 920 | rpc_inode_cachep = kmem_cache_create("rpc_inode_cache", |
fffb60f9 PJ |
921 | sizeof(struct rpc_inode), |
922 | 0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| | |
923 | SLAB_MEM_SPREAD), | |
20c2df83 | 924 | init_once); |
1da177e4 LT |
925 | if (!rpc_inode_cachep) |
926 | return -ENOMEM; | |
5bd5f581 AM |
927 | err = register_filesystem(&rpc_pipe_fs_type); |
928 | if (err) { | |
929 | kmem_cache_destroy(rpc_inode_cachep); | |
930 | return err; | |
931 | } | |
932 | ||
1da177e4 LT |
933 | return 0; |
934 | } | |
935 | ||
936 | void unregister_rpc_pipefs(void) | |
937 | { | |
1a1d92c1 | 938 | kmem_cache_destroy(rpc_inode_cachep); |
1da177e4 LT |
939 | unregister_filesystem(&rpc_pipe_fs_type); |
940 | } |