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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * net/sunrpc/rpc_pipe.c | |
3 | * | |
4 | * Userland/kernel interface for rpcauth_gss. | |
5 | * Code shamelessly plagiarized from fs/nfsd/nfsctl.c | |
d51fe1be | 6 | * and fs/sysfs/inode.c |
1da177e4 LT |
7 | * |
8 | * Copyright (c) 2002, Trond Myklebust <trond.myklebust@fys.uio.no> | |
9 | * | |
10 | */ | |
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> | |
8854e82d | 29 | #include <linux/sunrpc/cache.h> |
1da177e4 | 30 | |
ba89966c | 31 | static struct vfsmount *rpc_mount __read_mostly; |
1da177e4 LT |
32 | static int rpc_mount_count; |
33 | ||
34 | static struct file_system_type rpc_pipe_fs_type; | |
35 | ||
36 | ||
e18b890b | 37 | static struct kmem_cache *rpc_inode_cachep __read_mostly; |
1da177e4 LT |
38 | |
39 | #define RPC_UPCALL_TIMEOUT (30*HZ) | |
40 | ||
9842ef35 TM |
41 | static void rpc_purge_list(struct rpc_inode *rpci, struct list_head *head, |
42 | void (*destroy_msg)(struct rpc_pipe_msg *), int err) | |
1da177e4 | 43 | { |
1da177e4 LT |
44 | struct rpc_pipe_msg *msg; |
45 | ||
9842ef35 TM |
46 | if (list_empty(head)) |
47 | return; | |
48 | do { | |
b3eb67a2 | 49 | msg = list_entry(head->next, struct rpc_pipe_msg, list); |
5a67657a | 50 | list_del_init(&msg->list); |
1da177e4 | 51 | msg->errno = err; |
b3eb67a2 | 52 | destroy_msg(msg); |
9842ef35 | 53 | } while (!list_empty(head)); |
1da177e4 LT |
54 | wake_up(&rpci->waitq); |
55 | } | |
56 | ||
57 | static void | |
65f27f38 | 58 | rpc_timeout_upcall_queue(struct work_struct *work) |
1da177e4 | 59 | { |
9842ef35 | 60 | LIST_HEAD(free_list); |
65f27f38 DH |
61 | struct rpc_inode *rpci = |
62 | container_of(work, struct rpc_inode, queue_timeout.work); | |
1da177e4 | 63 | struct inode *inode = &rpci->vfs_inode; |
9842ef35 | 64 | void (*destroy_msg)(struct rpc_pipe_msg *); |
1da177e4 | 65 | |
9842ef35 TM |
66 | spin_lock(&inode->i_lock); |
67 | if (rpci->ops == NULL) { | |
68 | spin_unlock(&inode->i_lock); | |
69 | return; | |
70 | } | |
71 | destroy_msg = rpci->ops->destroy_msg; | |
72 | if (rpci->nreaders == 0) { | |
73 | list_splice_init(&rpci->pipe, &free_list); | |
74 | rpci->pipelen = 0; | |
75 | } | |
76 | spin_unlock(&inode->i_lock); | |
77 | rpc_purge_list(rpci, &free_list, destroy_msg, -ETIMEDOUT); | |
1da177e4 LT |
78 | } |
79 | ||
93a44a75 | 80 | /** |
1a5778aa | 81 | * rpc_queue_upcall - queue an upcall message to userspace |
93a44a75 BF |
82 | * @inode: inode of upcall pipe on which to queue given message |
83 | * @msg: message to queue | |
84 | * | |
85 | * Call with an @inode created by rpc_mkpipe() to queue an upcall. | |
86 | * A userspace process may then later read the upcall by performing a | |
87 | * read on an open file for this inode. It is up to the caller to | |
88 | * initialize the fields of @msg (other than @msg->list) appropriately. | |
89 | */ | |
1da177e4 LT |
90 | int |
91 | rpc_queue_upcall(struct inode *inode, struct rpc_pipe_msg *msg) | |
92 | { | |
93 | struct rpc_inode *rpci = RPC_I(inode); | |
6070fe6f | 94 | int res = -EPIPE; |
1da177e4 | 95 | |
9842ef35 | 96 | spin_lock(&inode->i_lock); |
6070fe6f TM |
97 | if (rpci->ops == NULL) |
98 | goto out; | |
1da177e4 LT |
99 | if (rpci->nreaders) { |
100 | list_add_tail(&msg->list, &rpci->pipe); | |
101 | rpci->pipelen += msg->len; | |
6070fe6f | 102 | res = 0; |
1da177e4 LT |
103 | } else if (rpci->flags & RPC_PIPE_WAIT_FOR_OPEN) { |
104 | if (list_empty(&rpci->pipe)) | |
24c5d9d7 TM |
105 | queue_delayed_work(rpciod_workqueue, |
106 | &rpci->queue_timeout, | |
1da177e4 LT |
107 | RPC_UPCALL_TIMEOUT); |
108 | list_add_tail(&msg->list, &rpci->pipe); | |
109 | rpci->pipelen += msg->len; | |
6070fe6f TM |
110 | res = 0; |
111 | } | |
112 | out: | |
9842ef35 | 113 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
114 | wake_up(&rpci->waitq); |
115 | return res; | |
116 | } | |
468039ee | 117 | EXPORT_SYMBOL_GPL(rpc_queue_upcall); |
1da177e4 | 118 | |
6070fe6f TM |
119 | static inline void |
120 | rpc_inode_setowner(struct inode *inode, void *private) | |
121 | { | |
122 | RPC_I(inode)->private = private; | |
123 | } | |
124 | ||
1da177e4 LT |
125 | static void |
126 | rpc_close_pipes(struct inode *inode) | |
127 | { | |
128 | struct rpc_inode *rpci = RPC_I(inode); | |
b693ba4a | 129 | const struct rpc_pipe_ops *ops; |
e712804a | 130 | int need_release; |
1da177e4 | 131 | |
1b1dcc1b | 132 | mutex_lock(&inode->i_mutex); |
9842ef35 TM |
133 | ops = rpci->ops; |
134 | if (ops != NULL) { | |
135 | LIST_HEAD(free_list); | |
9842ef35 | 136 | spin_lock(&inode->i_lock); |
e712804a | 137 | need_release = rpci->nreaders != 0 || rpci->nwriters != 0; |
1da177e4 | 138 | rpci->nreaders = 0; |
9842ef35 TM |
139 | list_splice_init(&rpci->in_upcall, &free_list); |
140 | list_splice_init(&rpci->pipe, &free_list); | |
141 | rpci->pipelen = 0; | |
1da177e4 | 142 | rpci->ops = NULL; |
9842ef35 TM |
143 | spin_unlock(&inode->i_lock); |
144 | rpc_purge_list(rpci, &free_list, ops->destroy_msg, -EPIPE); | |
145 | rpci->nwriters = 0; | |
e712804a | 146 | if (need_release && ops->release_pipe) |
9842ef35 | 147 | ops->release_pipe(inode); |
4011cd97 | 148 | cancel_delayed_work_sync(&rpci->queue_timeout); |
1da177e4 | 149 | } |
6070fe6f | 150 | rpc_inode_setowner(inode, NULL); |
1b1dcc1b | 151 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
152 | } |
153 | ||
1da177e4 LT |
154 | static struct inode * |
155 | rpc_alloc_inode(struct super_block *sb) | |
156 | { | |
157 | struct rpc_inode *rpci; | |
e94b1766 | 158 | rpci = (struct rpc_inode *)kmem_cache_alloc(rpc_inode_cachep, GFP_KERNEL); |
1da177e4 LT |
159 | if (!rpci) |
160 | return NULL; | |
161 | return &rpci->vfs_inode; | |
162 | } | |
163 | ||
164 | static void | |
165 | rpc_destroy_inode(struct inode *inode) | |
166 | { | |
167 | kmem_cache_free(rpc_inode_cachep, RPC_I(inode)); | |
168 | } | |
169 | ||
170 | static int | |
171 | rpc_pipe_open(struct inode *inode, struct file *filp) | |
172 | { | |
173 | struct rpc_inode *rpci = RPC_I(inode); | |
c3810608 | 174 | int first_open; |
1da177e4 LT |
175 | int res = -ENXIO; |
176 | ||
1b1dcc1b | 177 | mutex_lock(&inode->i_mutex); |
c3810608 BF |
178 | if (rpci->ops == NULL) |
179 | goto out; | |
180 | first_open = rpci->nreaders == 0 && rpci->nwriters == 0; | |
181 | if (first_open && rpci->ops->open_pipe) { | |
182 | res = rpci->ops->open_pipe(inode); | |
183 | if (res) | |
184 | goto out; | |
1da177e4 | 185 | } |
c3810608 BF |
186 | if (filp->f_mode & FMODE_READ) |
187 | rpci->nreaders++; | |
188 | if (filp->f_mode & FMODE_WRITE) | |
189 | rpci->nwriters++; | |
190 | res = 0; | |
191 | out: | |
1b1dcc1b | 192 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
193 | return res; |
194 | } | |
195 | ||
196 | static int | |
197 | rpc_pipe_release(struct inode *inode, struct file *filp) | |
198 | { | |
969b7f25 | 199 | struct rpc_inode *rpci = RPC_I(inode); |
1da177e4 | 200 | struct rpc_pipe_msg *msg; |
e712804a | 201 | int last_close; |
1da177e4 | 202 | |
1b1dcc1b | 203 | mutex_lock(&inode->i_mutex); |
1da177e4 LT |
204 | if (rpci->ops == NULL) |
205 | goto out; | |
655b5bb4 | 206 | msg = filp->private_data; |
1da177e4 | 207 | if (msg != NULL) { |
9842ef35 | 208 | spin_lock(&inode->i_lock); |
48e49187 | 209 | msg->errno = -EAGAIN; |
5a67657a | 210 | list_del_init(&msg->list); |
9842ef35 | 211 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
212 | rpci->ops->destroy_msg(msg); |
213 | } | |
214 | if (filp->f_mode & FMODE_WRITE) | |
215 | rpci->nwriters --; | |
9842ef35 | 216 | if (filp->f_mode & FMODE_READ) { |
1da177e4 | 217 | rpci->nreaders --; |
9842ef35 TM |
218 | if (rpci->nreaders == 0) { |
219 | LIST_HEAD(free_list); | |
220 | spin_lock(&inode->i_lock); | |
221 | list_splice_init(&rpci->pipe, &free_list); | |
222 | rpci->pipelen = 0; | |
223 | spin_unlock(&inode->i_lock); | |
224 | rpc_purge_list(rpci, &free_list, | |
225 | rpci->ops->destroy_msg, -EAGAIN); | |
226 | } | |
227 | } | |
e712804a BF |
228 | last_close = rpci->nwriters == 0 && rpci->nreaders == 0; |
229 | if (last_close && rpci->ops->release_pipe) | |
1da177e4 LT |
230 | rpci->ops->release_pipe(inode); |
231 | out: | |
1b1dcc1b | 232 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
233 | return 0; |
234 | } | |
235 | ||
236 | static ssize_t | |
237 | rpc_pipe_read(struct file *filp, char __user *buf, size_t len, loff_t *offset) | |
238 | { | |
303b46bb | 239 | struct inode *inode = filp->f_path.dentry->d_inode; |
1da177e4 LT |
240 | struct rpc_inode *rpci = RPC_I(inode); |
241 | struct rpc_pipe_msg *msg; | |
242 | int res = 0; | |
243 | ||
1b1dcc1b | 244 | mutex_lock(&inode->i_mutex); |
1da177e4 LT |
245 | if (rpci->ops == NULL) { |
246 | res = -EPIPE; | |
247 | goto out_unlock; | |
248 | } | |
249 | msg = filp->private_data; | |
250 | if (msg == NULL) { | |
9842ef35 | 251 | spin_lock(&inode->i_lock); |
1da177e4 LT |
252 | if (!list_empty(&rpci->pipe)) { |
253 | msg = list_entry(rpci->pipe.next, | |
254 | struct rpc_pipe_msg, | |
255 | list); | |
256 | list_move(&msg->list, &rpci->in_upcall); | |
257 | rpci->pipelen -= msg->len; | |
258 | filp->private_data = msg; | |
259 | msg->copied = 0; | |
260 | } | |
9842ef35 | 261 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
262 | if (msg == NULL) |
263 | goto out_unlock; | |
264 | } | |
265 | /* NOTE: it is up to the callback to update msg->copied */ | |
266 | res = rpci->ops->upcall(filp, msg, buf, len); | |
267 | if (res < 0 || msg->len == msg->copied) { | |
268 | filp->private_data = NULL; | |
9842ef35 | 269 | spin_lock(&inode->i_lock); |
5a67657a | 270 | list_del_init(&msg->list); |
9842ef35 | 271 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
272 | rpci->ops->destroy_msg(msg); |
273 | } | |
274 | out_unlock: | |
1b1dcc1b | 275 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
276 | return res; |
277 | } | |
278 | ||
279 | static ssize_t | |
280 | rpc_pipe_write(struct file *filp, const char __user *buf, size_t len, loff_t *offset) | |
281 | { | |
303b46bb | 282 | struct inode *inode = filp->f_path.dentry->d_inode; |
1da177e4 LT |
283 | struct rpc_inode *rpci = RPC_I(inode); |
284 | int res; | |
285 | ||
1b1dcc1b | 286 | mutex_lock(&inode->i_mutex); |
1da177e4 LT |
287 | res = -EPIPE; |
288 | if (rpci->ops != NULL) | |
289 | res = rpci->ops->downcall(filp, buf, len); | |
1b1dcc1b | 290 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
291 | return res; |
292 | } | |
293 | ||
294 | static unsigned int | |
295 | rpc_pipe_poll(struct file *filp, struct poll_table_struct *wait) | |
296 | { | |
297 | struct rpc_inode *rpci; | |
298 | unsigned int mask = 0; | |
299 | ||
303b46bb | 300 | rpci = RPC_I(filp->f_path.dentry->d_inode); |
1da177e4 LT |
301 | poll_wait(filp, &rpci->waitq, wait); |
302 | ||
303 | mask = POLLOUT | POLLWRNORM; | |
304 | if (rpci->ops == NULL) | |
305 | mask |= POLLERR | POLLHUP; | |
eda4f9b7 | 306 | if (filp->private_data || !list_empty(&rpci->pipe)) |
1da177e4 LT |
307 | mask |= POLLIN | POLLRDNORM; |
308 | return mask; | |
309 | } | |
310 | ||
a6f8dbc6 AB |
311 | static long |
312 | rpc_pipe_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) | |
1da177e4 | 313 | { |
a6f8dbc6 AB |
314 | struct inode *inode = filp->f_path.dentry->d_inode; |
315 | struct rpc_inode *rpci = RPC_I(inode); | |
1da177e4 LT |
316 | int len; |
317 | ||
318 | switch (cmd) { | |
319 | case FIONREAD: | |
a6f8dbc6 AB |
320 | spin_lock(&inode->i_lock); |
321 | if (rpci->ops == NULL) { | |
322 | spin_unlock(&inode->i_lock); | |
1da177e4 | 323 | return -EPIPE; |
a6f8dbc6 | 324 | } |
1da177e4 LT |
325 | len = rpci->pipelen; |
326 | if (filp->private_data) { | |
327 | struct rpc_pipe_msg *msg; | |
655b5bb4 | 328 | msg = filp->private_data; |
1da177e4 LT |
329 | len += msg->len - msg->copied; |
330 | } | |
a6f8dbc6 | 331 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
332 | return put_user(len, (int __user *)arg); |
333 | default: | |
334 | return -EINVAL; | |
335 | } | |
336 | } | |
337 | ||
da7071d7 | 338 | static const struct file_operations rpc_pipe_fops = { |
1da177e4 LT |
339 | .owner = THIS_MODULE, |
340 | .llseek = no_llseek, | |
341 | .read = rpc_pipe_read, | |
342 | .write = rpc_pipe_write, | |
343 | .poll = rpc_pipe_poll, | |
674b604c | 344 | .unlocked_ioctl = rpc_pipe_ioctl, |
1da177e4 LT |
345 | .open = rpc_pipe_open, |
346 | .release = rpc_pipe_release, | |
347 | }; | |
348 | ||
349 | static int | |
350 | rpc_show_info(struct seq_file *m, void *v) | |
351 | { | |
352 | struct rpc_clnt *clnt = m->private; | |
353 | ||
354 | seq_printf(m, "RPC server: %s\n", clnt->cl_server); | |
355 | seq_printf(m, "service: %s (%d) version %d\n", clnt->cl_protname, | |
356 | clnt->cl_prog, clnt->cl_vers); | |
e7f78657 CL |
357 | seq_printf(m, "address: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_ADDR)); |
358 | seq_printf(m, "protocol: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PROTO)); | |
bf19aace | 359 | seq_printf(m, "port: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PORT)); |
1da177e4 LT |
360 | return 0; |
361 | } | |
362 | ||
363 | static int | |
364 | rpc_info_open(struct inode *inode, struct file *file) | |
365 | { | |
006abe88 | 366 | struct rpc_clnt *clnt = NULL; |
1da177e4 LT |
367 | int ret = single_open(file, rpc_show_info, NULL); |
368 | ||
369 | if (!ret) { | |
370 | struct seq_file *m = file->private_data; | |
006abe88 TM |
371 | |
372 | spin_lock(&file->f_path.dentry->d_lock); | |
373 | if (!d_unhashed(file->f_path.dentry)) | |
374 | clnt = RPC_I(inode)->private; | |
375 | if (clnt != NULL && atomic_inc_not_zero(&clnt->cl_count)) { | |
376 | spin_unlock(&file->f_path.dentry->d_lock); | |
1da177e4 LT |
377 | m->private = clnt; |
378 | } else { | |
006abe88 | 379 | spin_unlock(&file->f_path.dentry->d_lock); |
1da177e4 LT |
380 | single_release(inode, file); |
381 | ret = -EINVAL; | |
382 | } | |
1da177e4 LT |
383 | } |
384 | return ret; | |
385 | } | |
386 | ||
387 | static int | |
388 | rpc_info_release(struct inode *inode, struct file *file) | |
389 | { | |
390 | struct seq_file *m = file->private_data; | |
391 | struct rpc_clnt *clnt = (struct rpc_clnt *)m->private; | |
392 | ||
393 | if (clnt) | |
394 | rpc_release_client(clnt); | |
395 | return single_release(inode, file); | |
396 | } | |
397 | ||
da7071d7 | 398 | static const struct file_operations rpc_info_operations = { |
1da177e4 LT |
399 | .owner = THIS_MODULE, |
400 | .open = rpc_info_open, | |
401 | .read = seq_read, | |
402 | .llseek = seq_lseek, | |
403 | .release = rpc_info_release, | |
404 | }; | |
405 | ||
406 | ||
1da177e4 LT |
407 | /* |
408 | * Description of fs contents. | |
409 | */ | |
410 | struct rpc_filelist { | |
ac6fecee | 411 | const char *name; |
99ac48f5 | 412 | const struct file_operations *i_fop; |
7364af6a | 413 | umode_t mode; |
1da177e4 LT |
414 | }; |
415 | ||
54281548 | 416 | struct vfsmount *rpc_get_mount(void) |
1da177e4 | 417 | { |
54281548 TM |
418 | int err; |
419 | ||
1f5ce9e9 | 420 | err = simple_pin_fs(&rpc_pipe_fs_type, &rpc_mount, &rpc_mount_count); |
54281548 TM |
421 | if (err != 0) |
422 | return ERR_PTR(err); | |
423 | return rpc_mount; | |
1da177e4 | 424 | } |
e571cbf1 | 425 | EXPORT_SYMBOL_GPL(rpc_get_mount); |
1da177e4 | 426 | |
54281548 | 427 | void rpc_put_mount(void) |
1da177e4 LT |
428 | { |
429 | simple_release_fs(&rpc_mount, &rpc_mount_count); | |
430 | } | |
e571cbf1 | 431 | EXPORT_SYMBOL_GPL(rpc_put_mount); |
1da177e4 | 432 | |
62e1761c TM |
433 | static int rpc_delete_dentry(struct dentry *dentry) |
434 | { | |
435 | return 1; | |
436 | } | |
437 | ||
3ba13d17 | 438 | static const struct dentry_operations rpc_dentry_operations = { |
62e1761c TM |
439 | .d_delete = rpc_delete_dentry, |
440 | }; | |
441 | ||
1da177e4 | 442 | static struct inode * |
7364af6a | 443 | rpc_get_inode(struct super_block *sb, umode_t mode) |
1da177e4 LT |
444 | { |
445 | struct inode *inode = new_inode(sb); | |
446 | if (!inode) | |
447 | return NULL; | |
448 | inode->i_mode = mode; | |
1da177e4 LT |
449 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
450 | switch(mode & S_IFMT) { | |
451 | case S_IFDIR: | |
452 | inode->i_fop = &simple_dir_operations; | |
453 | inode->i_op = &simple_dir_inode_operations; | |
d8c76e6f | 454 | inc_nlink(inode); |
1da177e4 LT |
455 | default: |
456 | break; | |
457 | } | |
458 | return inode; | |
459 | } | |
460 | ||
7589806e TM |
461 | static int __rpc_create_common(struct inode *dir, struct dentry *dentry, |
462 | umode_t mode, | |
463 | const struct file_operations *i_fop, | |
464 | void *private) | |
465 | { | |
466 | struct inode *inode; | |
467 | ||
468 | BUG_ON(!d_unhashed(dentry)); | |
469 | inode = rpc_get_inode(dir->i_sb, mode); | |
470 | if (!inode) | |
471 | goto out_err; | |
472 | inode->i_ino = iunique(dir->i_sb, 100); | |
473 | if (i_fop) | |
474 | inode->i_fop = i_fop; | |
475 | if (private) | |
476 | rpc_inode_setowner(inode, private); | |
477 | d_add(dentry, inode); | |
478 | return 0; | |
479 | out_err: | |
480 | printk(KERN_WARNING "%s: %s failed to allocate inode for dentry %s\n", | |
481 | __FILE__, __func__, dentry->d_name.name); | |
482 | dput(dentry); | |
483 | return -ENOMEM; | |
484 | } | |
485 | ||
ac6fecee TM |
486 | static int __rpc_create(struct inode *dir, struct dentry *dentry, |
487 | umode_t mode, | |
488 | const struct file_operations *i_fop, | |
489 | void *private) | |
490 | { | |
491 | int err; | |
492 | ||
493 | err = __rpc_create_common(dir, dentry, S_IFREG | mode, i_fop, private); | |
494 | if (err) | |
495 | return err; | |
496 | fsnotify_create(dir, dentry); | |
497 | return 0; | |
498 | } | |
499 | ||
7589806e TM |
500 | static int __rpc_mkdir(struct inode *dir, struct dentry *dentry, |
501 | umode_t mode, | |
502 | const struct file_operations *i_fop, | |
503 | void *private) | |
504 | { | |
505 | int err; | |
506 | ||
507 | err = __rpc_create_common(dir, dentry, S_IFDIR | mode, i_fop, private); | |
508 | if (err) | |
509 | return err; | |
510 | inc_nlink(dir); | |
511 | fsnotify_mkdir(dir, dentry); | |
512 | return 0; | |
513 | } | |
514 | ||
515 | static int __rpc_mkpipe(struct inode *dir, struct dentry *dentry, | |
516 | umode_t mode, | |
517 | const struct file_operations *i_fop, | |
518 | void *private, | |
519 | const struct rpc_pipe_ops *ops, | |
520 | int flags) | |
521 | { | |
522 | struct rpc_inode *rpci; | |
523 | int err; | |
524 | ||
525 | err = __rpc_create_common(dir, dentry, S_IFIFO | mode, i_fop, private); | |
526 | if (err) | |
527 | return err; | |
528 | rpci = RPC_I(dentry->d_inode); | |
529 | rpci->nkern_readwriters = 1; | |
530 | rpci->private = private; | |
531 | rpci->flags = flags; | |
532 | rpci->ops = ops; | |
533 | fsnotify_create(dir, dentry); | |
534 | return 0; | |
535 | } | |
536 | ||
ac6fecee TM |
537 | static int __rpc_rmdir(struct inode *dir, struct dentry *dentry) |
538 | { | |
539 | int ret; | |
540 | ||
541 | dget(dentry); | |
542 | ret = simple_rmdir(dir, dentry); | |
543 | d_delete(dentry); | |
544 | dput(dentry); | |
545 | return ret; | |
546 | } | |
547 | ||
810d90bc TM |
548 | static int __rpc_unlink(struct inode *dir, struct dentry *dentry) |
549 | { | |
550 | int ret; | |
551 | ||
552 | dget(dentry); | |
553 | ret = simple_unlink(dir, dentry); | |
554 | d_delete(dentry); | |
555 | dput(dentry); | |
556 | return ret; | |
557 | } | |
558 | ||
559 | static int __rpc_rmpipe(struct inode *dir, struct dentry *dentry) | |
560 | { | |
561 | struct inode *inode = dentry->d_inode; | |
562 | struct rpc_inode *rpci = RPC_I(inode); | |
563 | ||
564 | rpci->nkern_readwriters--; | |
565 | if (rpci->nkern_readwriters != 0) | |
566 | return 0; | |
567 | rpc_close_pipes(inode); | |
568 | return __rpc_unlink(dir, dentry); | |
569 | } | |
570 | ||
cfeaa4a3 TM |
571 | static struct dentry *__rpc_lookup_create(struct dentry *parent, |
572 | struct qstr *name) | |
573 | { | |
574 | struct dentry *dentry; | |
575 | ||
576 | dentry = d_lookup(parent, name); | |
577 | if (!dentry) { | |
578 | dentry = d_alloc(parent, name); | |
579 | if (!dentry) { | |
580 | dentry = ERR_PTR(-ENOMEM); | |
581 | goto out_err; | |
582 | } | |
583 | } | |
584 | if (!dentry->d_inode) | |
585 | dentry->d_op = &rpc_dentry_operations; | |
586 | out_err: | |
587 | return dentry; | |
588 | } | |
589 | ||
590 | static struct dentry *__rpc_lookup_create_exclusive(struct dentry *parent, | |
591 | struct qstr *name) | |
592 | { | |
593 | struct dentry *dentry; | |
594 | ||
595 | dentry = __rpc_lookup_create(parent, name); | |
f1f0abe1 DC |
596 | if (IS_ERR(dentry)) |
597 | return dentry; | |
cfeaa4a3 TM |
598 | if (dentry->d_inode == NULL) |
599 | return dentry; | |
600 | dput(dentry); | |
601 | return ERR_PTR(-EEXIST); | |
602 | } | |
603 | ||
1da177e4 LT |
604 | /* |
605 | * FIXME: This probably has races. | |
606 | */ | |
ac6fecee TM |
607 | static void __rpc_depopulate(struct dentry *parent, |
608 | const struct rpc_filelist *files, | |
609 | int start, int eof) | |
1da177e4 LT |
610 | { |
611 | struct inode *dir = parent->d_inode; | |
ac6fecee TM |
612 | struct dentry *dentry; |
613 | struct qstr name; | |
614 | int i; | |
1da177e4 | 615 | |
ac6fecee TM |
616 | for (i = start; i < eof; i++) { |
617 | name.name = files[i].name; | |
618 | name.len = strlen(files[i].name); | |
619 | name.hash = full_name_hash(name.name, name.len); | |
620 | dentry = d_lookup(parent, &name); | |
621 | ||
622 | if (dentry == NULL) | |
62e1761c | 623 | continue; |
ac6fecee TM |
624 | if (dentry->d_inode == NULL) |
625 | goto next; | |
626 | switch (dentry->d_inode->i_mode & S_IFMT) { | |
627 | default: | |
628 | BUG(); | |
629 | case S_IFREG: | |
630 | __rpc_unlink(dir, dentry); | |
1da177e4 | 631 | break; |
ac6fecee TM |
632 | case S_IFDIR: |
633 | __rpc_rmdir(dir, dentry); | |
634 | } | |
635 | next: | |
636 | dput(dentry); | |
1da177e4 | 637 | } |
ac6fecee TM |
638 | } |
639 | ||
640 | static void rpc_depopulate(struct dentry *parent, | |
641 | const struct rpc_filelist *files, | |
642 | int start, int eof) | |
643 | { | |
644 | struct inode *dir = parent->d_inode; | |
645 | ||
646 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_CHILD); | |
647 | __rpc_depopulate(parent, files, start, eof); | |
1b1dcc1b | 648 | mutex_unlock(&dir->i_mutex); |
1da177e4 LT |
649 | } |
650 | ||
ac6fecee TM |
651 | static int rpc_populate(struct dentry *parent, |
652 | const struct rpc_filelist *files, | |
653 | int start, int eof, | |
654 | void *private) | |
1da177e4 | 655 | { |
ac6fecee | 656 | struct inode *dir = parent->d_inode; |
1da177e4 | 657 | struct dentry *dentry; |
ac6fecee | 658 | int i, err; |
1da177e4 | 659 | |
1b1dcc1b | 660 | mutex_lock(&dir->i_mutex); |
1da177e4 | 661 | for (i = start; i < eof; i++) { |
ac6fecee TM |
662 | struct qstr q; |
663 | ||
664 | q.name = files[i].name; | |
665 | q.len = strlen(files[i].name); | |
666 | q.hash = full_name_hash(q.name, q.len); | |
667 | dentry = __rpc_lookup_create_exclusive(parent, &q); | |
668 | err = PTR_ERR(dentry); | |
669 | if (IS_ERR(dentry)) | |
1da177e4 | 670 | goto out_bad; |
ac6fecee TM |
671 | switch (files[i].mode & S_IFMT) { |
672 | default: | |
673 | BUG(); | |
674 | case S_IFREG: | |
675 | err = __rpc_create(dir, dentry, | |
676 | files[i].mode, | |
677 | files[i].i_fop, | |
678 | private); | |
679 | break; | |
680 | case S_IFDIR: | |
681 | err = __rpc_mkdir(dir, dentry, | |
682 | files[i].mode, | |
683 | NULL, | |
684 | private); | |
1da177e4 | 685 | } |
ac6fecee TM |
686 | if (err != 0) |
687 | goto out_bad; | |
1da177e4 | 688 | } |
1b1dcc1b | 689 | mutex_unlock(&dir->i_mutex); |
1da177e4 LT |
690 | return 0; |
691 | out_bad: | |
ac6fecee | 692 | __rpc_depopulate(parent, files, start, eof); |
1b1dcc1b | 693 | mutex_unlock(&dir->i_mutex); |
1da177e4 | 694 | printk(KERN_WARNING "%s: %s failed to populate directory %s\n", |
0dc47877 | 695 | __FILE__, __func__, parent->d_name.name); |
ac6fecee | 696 | return err; |
f134585a | 697 | } |
1da177e4 | 698 | |
e57aed77 TM |
699 | static struct dentry *rpc_mkdir_populate(struct dentry *parent, |
700 | struct qstr *name, umode_t mode, void *private, | |
701 | int (*populate)(struct dentry *, void *), void *args_populate) | |
f134585a | 702 | { |
f134585a | 703 | struct dentry *dentry; |
7d59d1e8 | 704 | struct inode *dir = parent->d_inode; |
f134585a TM |
705 | int error; |
706 | ||
7d59d1e8 TM |
707 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); |
708 | dentry = __rpc_lookup_create_exclusive(parent, name); | |
f134585a | 709 | if (IS_ERR(dentry)) |
7d59d1e8 TM |
710 | goto out; |
711 | error = __rpc_mkdir(dir, dentry, mode, NULL, private); | |
7589806e TM |
712 | if (error != 0) |
713 | goto out_err; | |
e57aed77 TM |
714 | if (populate != NULL) { |
715 | error = populate(dentry, args_populate); | |
716 | if (error) | |
717 | goto err_rmdir; | |
718 | } | |
f134585a | 719 | out: |
1b1dcc1b | 720 | mutex_unlock(&dir->i_mutex); |
5c3e985a | 721 | return dentry; |
ac6fecee | 722 | err_rmdir: |
f134585a | 723 | __rpc_rmdir(dir, dentry); |
7589806e | 724 | out_err: |
f134585a TM |
725 | dentry = ERR_PTR(error); |
726 | goto out; | |
1da177e4 LT |
727 | } |
728 | ||
e57aed77 TM |
729 | static int rpc_rmdir_depopulate(struct dentry *dentry, |
730 | void (*depopulate)(struct dentry *)) | |
1da177e4 | 731 | { |
dff02cc1 | 732 | struct dentry *parent; |
f134585a TM |
733 | struct inode *dir; |
734 | int error; | |
278c995c | 735 | |
dff02cc1 TM |
736 | parent = dget_parent(dentry); |
737 | dir = parent->d_inode; | |
c6573c29 | 738 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); |
e57aed77 TM |
739 | if (depopulate != NULL) |
740 | depopulate(dentry); | |
f134585a | 741 | error = __rpc_rmdir(dir, dentry); |
1b1dcc1b | 742 | mutex_unlock(&dir->i_mutex); |
dff02cc1 | 743 | dput(parent); |
f134585a | 744 | return error; |
1da177e4 LT |
745 | } |
746 | ||
93a44a75 BF |
747 | /** |
748 | * rpc_mkpipe - make an rpc_pipefs file for kernel<->userspace communication | |
749 | * @parent: dentry of directory to create new "pipe" in | |
750 | * @name: name of pipe | |
751 | * @private: private data to associate with the pipe, for the caller's use | |
752 | * @ops: operations defining the behavior of the pipe: upcall, downcall, | |
c3810608 | 753 | * release_pipe, open_pipe, and destroy_msg. |
65b6e42c | 754 | * @flags: rpc_inode flags |
93a44a75 BF |
755 | * |
756 | * Data is made available for userspace to read by calls to | |
757 | * rpc_queue_upcall(). The actual reads will result in calls to | |
758 | * @ops->upcall, which will be called with the file pointer, | |
759 | * message, and userspace buffer to copy to. | |
760 | * | |
761 | * Writes can come at any time, and do not necessarily have to be | |
762 | * responses to upcalls. They will result in calls to @msg->downcall. | |
763 | * | |
764 | * The @private argument passed here will be available to all these methods | |
765 | * from the file pointer, via RPC_I(file->f_dentry->d_inode)->private. | |
766 | */ | |
b693ba4a TM |
767 | struct dentry *rpc_mkpipe(struct dentry *parent, const char *name, |
768 | void *private, const struct rpc_pipe_ops *ops, | |
769 | int flags) | |
1da177e4 | 770 | { |
1da177e4 | 771 | struct dentry *dentry; |
7589806e | 772 | struct inode *dir = parent->d_inode; |
7364af6a | 773 | umode_t umode = S_IFIFO | S_IRUSR | S_IWUSR; |
cfeaa4a3 | 774 | struct qstr q; |
7589806e | 775 | int err; |
7364af6a TM |
776 | |
777 | if (ops->upcall == NULL) | |
778 | umode &= ~S_IRUGO; | |
779 | if (ops->downcall == NULL) | |
780 | umode &= ~S_IWUGO; | |
1da177e4 | 781 | |
cfeaa4a3 TM |
782 | q.name = name; |
783 | q.len = strlen(name); | |
784 | q.hash = full_name_hash(q.name, q.len), | |
785 | ||
786 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); | |
787 | dentry = __rpc_lookup_create(parent, &q); | |
1da177e4 | 788 | if (IS_ERR(dentry)) |
cfeaa4a3 | 789 | goto out; |
34f30896 | 790 | if (dentry->d_inode) { |
7589806e | 791 | struct rpc_inode *rpci = RPC_I(dentry->d_inode); |
34f30896 TM |
792 | if (rpci->private != private || |
793 | rpci->ops != ops || | |
794 | rpci->flags != flags) { | |
795 | dput (dentry); | |
810d90bc TM |
796 | err = -EBUSY; |
797 | goto out_err; | |
34f30896 | 798 | } |
03a1256f | 799 | rpci->nkern_readwriters++; |
34f30896 TM |
800 | goto out; |
801 | } | |
7589806e TM |
802 | |
803 | err = __rpc_mkpipe(dir, dentry, umode, &rpc_pipe_fops, | |
810d90bc | 804 | private, ops, flags); |
7589806e TM |
805 | if (err) |
806 | goto out_err; | |
f134585a | 807 | out: |
1b1dcc1b | 808 | mutex_unlock(&dir->i_mutex); |
5c3e985a | 809 | return dentry; |
7589806e TM |
810 | out_err: |
811 | dentry = ERR_PTR(err); | |
158998b6 | 812 | printk(KERN_WARNING "%s: %s() failed to create pipe %s/%s (errno = %d)\n", |
0dc47877 | 813 | __FILE__, __func__, parent->d_name.name, name, |
7589806e | 814 | err); |
f134585a | 815 | goto out; |
1da177e4 | 816 | } |
468039ee | 817 | EXPORT_SYMBOL_GPL(rpc_mkpipe); |
1da177e4 | 818 | |
93a44a75 BF |
819 | /** |
820 | * rpc_unlink - remove a pipe | |
821 | * @dentry: dentry for the pipe, as returned from rpc_mkpipe | |
822 | * | |
823 | * After this call, lookups will no longer find the pipe, and any | |
824 | * attempts to read or write using preexisting opens of the pipe will | |
825 | * return -EPIPE. | |
826 | */ | |
f134585a | 827 | int |
5d67476f | 828 | rpc_unlink(struct dentry *dentry) |
1da177e4 | 829 | { |
5d67476f | 830 | struct dentry *parent; |
f134585a | 831 | struct inode *dir; |
5d67476f | 832 | int error = 0; |
1da177e4 | 833 | |
5d67476f TM |
834 | parent = dget_parent(dentry); |
835 | dir = parent->d_inode; | |
c6573c29 | 836 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); |
810d90bc | 837 | error = __rpc_rmpipe(dir, dentry); |
1b1dcc1b | 838 | mutex_unlock(&dir->i_mutex); |
5d67476f | 839 | dput(parent); |
f134585a | 840 | return error; |
1da177e4 | 841 | } |
468039ee | 842 | EXPORT_SYMBOL_GPL(rpc_unlink); |
1da177e4 | 843 | |
e57aed77 TM |
844 | enum { |
845 | RPCAUTH_info, | |
846 | RPCAUTH_EOF | |
847 | }; | |
848 | ||
849 | static const struct rpc_filelist authfiles[] = { | |
850 | [RPCAUTH_info] = { | |
851 | .name = "info", | |
852 | .i_fop = &rpc_info_operations, | |
853 | .mode = S_IFREG | S_IRUSR, | |
854 | }, | |
855 | }; | |
856 | ||
857 | static int rpc_clntdir_populate(struct dentry *dentry, void *private) | |
858 | { | |
859 | return rpc_populate(dentry, | |
860 | authfiles, RPCAUTH_info, RPCAUTH_EOF, | |
861 | private); | |
862 | } | |
863 | ||
864 | static void rpc_clntdir_depopulate(struct dentry *dentry) | |
865 | { | |
866 | rpc_depopulate(dentry, authfiles, RPCAUTH_info, RPCAUTH_EOF); | |
867 | } | |
868 | ||
7d59d1e8 TM |
869 | /** |
870 | * rpc_create_client_dir - Create a new rpc_client directory in rpc_pipefs | |
4111d4fd RD |
871 | * @dentry: dentry from the rpc_pipefs root to the new directory |
872 | * @name: &struct qstr for the name | |
7d59d1e8 TM |
873 | * @rpc_client: rpc client to associate with this directory |
874 | * | |
875 | * This creates a directory at the given @path associated with | |
876 | * @rpc_clnt, which will contain a file named "info" with some basic | |
877 | * information about the client, together with any "pipes" that may | |
878 | * later be created using rpc_mkpipe(). | |
879 | */ | |
23ac6581 | 880 | struct dentry *rpc_create_client_dir(struct dentry *dentry, |
e57aed77 TM |
881 | struct qstr *name, |
882 | struct rpc_clnt *rpc_client) | |
883 | { | |
884 | return rpc_mkdir_populate(dentry, name, S_IRUGO | S_IXUGO, NULL, | |
885 | rpc_clntdir_populate, rpc_client); | |
886 | } | |
887 | ||
888 | /** | |
889 | * rpc_remove_client_dir - Remove a directory created with rpc_create_client_dir() | |
890 | * @dentry: directory to remove | |
891 | */ | |
892 | int rpc_remove_client_dir(struct dentry *dentry) | |
7d59d1e8 | 893 | { |
e57aed77 | 894 | return rpc_rmdir_depopulate(dentry, rpc_clntdir_depopulate); |
7d59d1e8 TM |
895 | } |
896 | ||
8854e82d TM |
897 | static const struct rpc_filelist cache_pipefs_files[3] = { |
898 | [0] = { | |
899 | .name = "channel", | |
900 | .i_fop = &cache_file_operations_pipefs, | |
96c61cbd | 901 | .mode = S_IFREG|S_IRUSR|S_IWUSR, |
8854e82d TM |
902 | }, |
903 | [1] = { | |
904 | .name = "content", | |
905 | .i_fop = &content_file_operations_pipefs, | |
906 | .mode = S_IFREG|S_IRUSR, | |
907 | }, | |
908 | [2] = { | |
909 | .name = "flush", | |
910 | .i_fop = &cache_flush_operations_pipefs, | |
911 | .mode = S_IFREG|S_IRUSR|S_IWUSR, | |
912 | }, | |
913 | }; | |
914 | ||
915 | static int rpc_cachedir_populate(struct dentry *dentry, void *private) | |
916 | { | |
917 | return rpc_populate(dentry, | |
918 | cache_pipefs_files, 0, 3, | |
919 | private); | |
920 | } | |
921 | ||
922 | static void rpc_cachedir_depopulate(struct dentry *dentry) | |
923 | { | |
924 | rpc_depopulate(dentry, cache_pipefs_files, 0, 3); | |
925 | } | |
926 | ||
927 | struct dentry *rpc_create_cache_dir(struct dentry *parent, struct qstr *name, | |
928 | mode_t umode, struct cache_detail *cd) | |
929 | { | |
930 | return rpc_mkdir_populate(parent, name, umode, NULL, | |
931 | rpc_cachedir_populate, cd); | |
932 | } | |
933 | ||
934 | void rpc_remove_cache_dir(struct dentry *dentry) | |
935 | { | |
936 | rpc_rmdir_depopulate(dentry, rpc_cachedir_depopulate); | |
937 | } | |
938 | ||
1da177e4 LT |
939 | /* |
940 | * populate the filesystem | |
941 | */ | |
b87221de | 942 | static const struct super_operations s_ops = { |
1da177e4 LT |
943 | .alloc_inode = rpc_alloc_inode, |
944 | .destroy_inode = rpc_destroy_inode, | |
945 | .statfs = simple_statfs, | |
946 | }; | |
947 | ||
948 | #define RPCAUTH_GSSMAGIC 0x67596969 | |
949 | ||
bb156749 TM |
950 | /* |
951 | * We have a single directory with 1 node in it. | |
952 | */ | |
953 | enum { | |
954 | RPCAUTH_lockd, | |
955 | RPCAUTH_mount, | |
956 | RPCAUTH_nfs, | |
957 | RPCAUTH_portmap, | |
958 | RPCAUTH_statd, | |
959 | RPCAUTH_nfsd4_cb, | |
e571cbf1 | 960 | RPCAUTH_cache, |
bb156749 TM |
961 | RPCAUTH_RootEOF |
962 | }; | |
963 | ||
964 | static const struct rpc_filelist files[] = { | |
965 | [RPCAUTH_lockd] = { | |
966 | .name = "lockd", | |
967 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
968 | }, | |
969 | [RPCAUTH_mount] = { | |
970 | .name = "mount", | |
971 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
972 | }, | |
973 | [RPCAUTH_nfs] = { | |
974 | .name = "nfs", | |
975 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
976 | }, | |
977 | [RPCAUTH_portmap] = { | |
978 | .name = "portmap", | |
979 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
980 | }, | |
981 | [RPCAUTH_statd] = { | |
982 | .name = "statd", | |
983 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
984 | }, | |
985 | [RPCAUTH_nfsd4_cb] = { | |
986 | .name = "nfsd4_cb", | |
987 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
988 | }, | |
e571cbf1 TM |
989 | [RPCAUTH_cache] = { |
990 | .name = "cache", | |
991 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
992 | }, | |
bb156749 TM |
993 | }; |
994 | ||
1da177e4 LT |
995 | static int |
996 | rpc_fill_super(struct super_block *sb, void *data, int silent) | |
997 | { | |
998 | struct inode *inode; | |
999 | struct dentry *root; | |
1000 | ||
1001 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
1002 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
1003 | sb->s_magic = RPCAUTH_GSSMAGIC; | |
1004 | sb->s_op = &s_ops; | |
1005 | sb->s_time_gran = 1; | |
1006 | ||
1007 | inode = rpc_get_inode(sb, S_IFDIR | 0755); | |
1008 | if (!inode) | |
1009 | return -ENOMEM; | |
fc7bed8c | 1010 | sb->s_root = root = d_alloc_root(inode); |
1da177e4 LT |
1011 | if (!root) { |
1012 | iput(inode); | |
1013 | return -ENOMEM; | |
1014 | } | |
ac6fecee | 1015 | if (rpc_populate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF, NULL)) |
fc7bed8c | 1016 | return -ENOMEM; |
1da177e4 | 1017 | return 0; |
1da177e4 LT |
1018 | } |
1019 | ||
454e2398 | 1020 | static int |
1da177e4 | 1021 | rpc_get_sb(struct file_system_type *fs_type, |
454e2398 | 1022 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) |
1da177e4 | 1023 | { |
454e2398 | 1024 | return get_sb_single(fs_type, flags, data, rpc_fill_super, mnt); |
1da177e4 LT |
1025 | } |
1026 | ||
1027 | static struct file_system_type rpc_pipe_fs_type = { | |
1028 | .owner = THIS_MODULE, | |
1029 | .name = "rpc_pipefs", | |
1030 | .get_sb = rpc_get_sb, | |
1031 | .kill_sb = kill_litter_super, | |
1032 | }; | |
1033 | ||
1034 | static void | |
51cc5068 | 1035 | init_once(void *foo) |
1da177e4 LT |
1036 | { |
1037 | struct rpc_inode *rpci = (struct rpc_inode *) foo; | |
1038 | ||
a35afb83 CL |
1039 | inode_init_once(&rpci->vfs_inode); |
1040 | rpci->private = NULL; | |
1041 | rpci->nreaders = 0; | |
1042 | rpci->nwriters = 0; | |
1043 | INIT_LIST_HEAD(&rpci->in_upcall); | |
6e84c7b6 | 1044 | INIT_LIST_HEAD(&rpci->in_downcall); |
a35afb83 CL |
1045 | INIT_LIST_HEAD(&rpci->pipe); |
1046 | rpci->pipelen = 0; | |
1047 | init_waitqueue_head(&rpci->waitq); | |
1048 | INIT_DELAYED_WORK(&rpci->queue_timeout, | |
1049 | rpc_timeout_upcall_queue); | |
1050 | rpci->ops = NULL; | |
1da177e4 LT |
1051 | } |
1052 | ||
1053 | int register_rpc_pipefs(void) | |
1054 | { | |
5bd5f581 AM |
1055 | int err; |
1056 | ||
1da177e4 | 1057 | rpc_inode_cachep = kmem_cache_create("rpc_inode_cache", |
fffb60f9 PJ |
1058 | sizeof(struct rpc_inode), |
1059 | 0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| | |
1060 | SLAB_MEM_SPREAD), | |
20c2df83 | 1061 | init_once); |
1da177e4 LT |
1062 | if (!rpc_inode_cachep) |
1063 | return -ENOMEM; | |
5bd5f581 AM |
1064 | err = register_filesystem(&rpc_pipe_fs_type); |
1065 | if (err) { | |
1066 | kmem_cache_destroy(rpc_inode_cachep); | |
1067 | return err; | |
1068 | } | |
1069 | ||
1da177e4 LT |
1070 | return 0; |
1071 | } | |
1072 | ||
1073 | void unregister_rpc_pipefs(void) | |
1074 | { | |
1a1d92c1 | 1075 | kmem_cache_destroy(rpc_inode_cachep); |
1da177e4 LT |
1076 | unregister_filesystem(&rpc_pipe_fs_type); |
1077 | } |