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> | |
8854e82d | 29 | #include <linux/sunrpc/cache.h> |
674b604c | 30 | #include <linux/smp_lock.h> |
1da177e4 | 31 | |
ba89966c | 32 | static struct vfsmount *rpc_mount __read_mostly; |
1da177e4 LT |
33 | static int rpc_mount_count; |
34 | ||
35 | static struct file_system_type rpc_pipe_fs_type; | |
36 | ||
37 | ||
e18b890b | 38 | static struct kmem_cache *rpc_inode_cachep __read_mostly; |
1da177e4 LT |
39 | |
40 | #define RPC_UPCALL_TIMEOUT (30*HZ) | |
41 | ||
9842ef35 TM |
42 | static void rpc_purge_list(struct rpc_inode *rpci, struct list_head *head, |
43 | void (*destroy_msg)(struct rpc_pipe_msg *), int err) | |
1da177e4 | 44 | { |
1da177e4 LT |
45 | struct rpc_pipe_msg *msg; |
46 | ||
9842ef35 TM |
47 | if (list_empty(head)) |
48 | return; | |
49 | do { | |
b3eb67a2 | 50 | msg = list_entry(head->next, struct rpc_pipe_msg, list); |
5a67657a | 51 | list_del_init(&msg->list); |
1da177e4 | 52 | msg->errno = err; |
b3eb67a2 | 53 | destroy_msg(msg); |
9842ef35 | 54 | } while (!list_empty(head)); |
1da177e4 LT |
55 | wake_up(&rpci->waitq); |
56 | } | |
57 | ||
58 | static void | |
65f27f38 | 59 | rpc_timeout_upcall_queue(struct work_struct *work) |
1da177e4 | 60 | { |
9842ef35 | 61 | LIST_HEAD(free_list); |
65f27f38 DH |
62 | struct rpc_inode *rpci = |
63 | container_of(work, struct rpc_inode, queue_timeout.work); | |
1da177e4 | 64 | struct inode *inode = &rpci->vfs_inode; |
9842ef35 | 65 | void (*destroy_msg)(struct rpc_pipe_msg *); |
1da177e4 | 66 | |
9842ef35 TM |
67 | spin_lock(&inode->i_lock); |
68 | if (rpci->ops == NULL) { | |
69 | spin_unlock(&inode->i_lock); | |
70 | return; | |
71 | } | |
72 | destroy_msg = rpci->ops->destroy_msg; | |
73 | if (rpci->nreaders == 0) { | |
74 | list_splice_init(&rpci->pipe, &free_list); | |
75 | rpci->pipelen = 0; | |
76 | } | |
77 | spin_unlock(&inode->i_lock); | |
78 | rpc_purge_list(rpci, &free_list, destroy_msg, -ETIMEDOUT); | |
1da177e4 LT |
79 | } |
80 | ||
93a44a75 | 81 | /** |
1a5778aa | 82 | * rpc_queue_upcall - queue an upcall message to userspace |
93a44a75 BF |
83 | * @inode: inode of upcall pipe on which to queue given message |
84 | * @msg: message to queue | |
85 | * | |
86 | * Call with an @inode created by rpc_mkpipe() to queue an upcall. | |
87 | * A userspace process may then later read the upcall by performing a | |
88 | * read on an open file for this inode. It is up to the caller to | |
89 | * initialize the fields of @msg (other than @msg->list) appropriately. | |
90 | */ | |
1da177e4 LT |
91 | int |
92 | rpc_queue_upcall(struct inode *inode, struct rpc_pipe_msg *msg) | |
93 | { | |
94 | struct rpc_inode *rpci = RPC_I(inode); | |
6070fe6f | 95 | int res = -EPIPE; |
1da177e4 | 96 | |
9842ef35 | 97 | spin_lock(&inode->i_lock); |
6070fe6f TM |
98 | if (rpci->ops == NULL) |
99 | goto out; | |
1da177e4 LT |
100 | if (rpci->nreaders) { |
101 | list_add_tail(&msg->list, &rpci->pipe); | |
102 | rpci->pipelen += msg->len; | |
6070fe6f | 103 | res = 0; |
1da177e4 LT |
104 | } else if (rpci->flags & RPC_PIPE_WAIT_FOR_OPEN) { |
105 | if (list_empty(&rpci->pipe)) | |
24c5d9d7 TM |
106 | queue_delayed_work(rpciod_workqueue, |
107 | &rpci->queue_timeout, | |
1da177e4 LT |
108 | RPC_UPCALL_TIMEOUT); |
109 | list_add_tail(&msg->list, &rpci->pipe); | |
110 | rpci->pipelen += msg->len; | |
6070fe6f TM |
111 | res = 0; |
112 | } | |
113 | out: | |
9842ef35 | 114 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
115 | wake_up(&rpci->waitq); |
116 | return res; | |
117 | } | |
468039ee | 118 | EXPORT_SYMBOL_GPL(rpc_queue_upcall); |
1da177e4 | 119 | |
6070fe6f TM |
120 | static inline void |
121 | rpc_inode_setowner(struct inode *inode, void *private) | |
122 | { | |
123 | RPC_I(inode)->private = private; | |
124 | } | |
125 | ||
1da177e4 LT |
126 | static void |
127 | rpc_close_pipes(struct inode *inode) | |
128 | { | |
129 | struct rpc_inode *rpci = RPC_I(inode); | |
b693ba4a | 130 | const struct rpc_pipe_ops *ops; |
e712804a | 131 | int need_release; |
1da177e4 | 132 | |
1b1dcc1b | 133 | mutex_lock(&inode->i_mutex); |
9842ef35 TM |
134 | ops = rpci->ops; |
135 | if (ops != NULL) { | |
136 | LIST_HEAD(free_list); | |
9842ef35 | 137 | spin_lock(&inode->i_lock); |
e712804a | 138 | need_release = rpci->nreaders != 0 || rpci->nwriters != 0; |
1da177e4 | 139 | rpci->nreaders = 0; |
9842ef35 TM |
140 | list_splice_init(&rpci->in_upcall, &free_list); |
141 | list_splice_init(&rpci->pipe, &free_list); | |
142 | rpci->pipelen = 0; | |
1da177e4 | 143 | rpci->ops = NULL; |
9842ef35 TM |
144 | spin_unlock(&inode->i_lock); |
145 | rpc_purge_list(rpci, &free_list, ops->destroy_msg, -EPIPE); | |
146 | rpci->nwriters = 0; | |
e712804a | 147 | if (need_release && ops->release_pipe) |
9842ef35 | 148 | ops->release_pipe(inode); |
4011cd97 | 149 | cancel_delayed_work_sync(&rpci->queue_timeout); |
1da177e4 | 150 | } |
6070fe6f | 151 | rpc_inode_setowner(inode, NULL); |
1b1dcc1b | 152 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
153 | } |
154 | ||
1da177e4 LT |
155 | static struct inode * |
156 | rpc_alloc_inode(struct super_block *sb) | |
157 | { | |
158 | struct rpc_inode *rpci; | |
e94b1766 | 159 | rpci = (struct rpc_inode *)kmem_cache_alloc(rpc_inode_cachep, GFP_KERNEL); |
1da177e4 LT |
160 | if (!rpci) |
161 | return NULL; | |
162 | return &rpci->vfs_inode; | |
163 | } | |
164 | ||
165 | static void | |
166 | rpc_destroy_inode(struct inode *inode) | |
167 | { | |
168 | kmem_cache_free(rpc_inode_cachep, RPC_I(inode)); | |
169 | } | |
170 | ||
171 | static int | |
172 | rpc_pipe_open(struct inode *inode, struct file *filp) | |
173 | { | |
174 | struct rpc_inode *rpci = RPC_I(inode); | |
c3810608 | 175 | int first_open; |
1da177e4 LT |
176 | int res = -ENXIO; |
177 | ||
1b1dcc1b | 178 | mutex_lock(&inode->i_mutex); |
c3810608 BF |
179 | if (rpci->ops == NULL) |
180 | goto out; | |
181 | first_open = rpci->nreaders == 0 && rpci->nwriters == 0; | |
182 | if (first_open && rpci->ops->open_pipe) { | |
183 | res = rpci->ops->open_pipe(inode); | |
184 | if (res) | |
185 | goto out; | |
1da177e4 | 186 | } |
c3810608 BF |
187 | if (filp->f_mode & FMODE_READ) |
188 | rpci->nreaders++; | |
189 | if (filp->f_mode & FMODE_WRITE) | |
190 | rpci->nwriters++; | |
191 | res = 0; | |
192 | out: | |
1b1dcc1b | 193 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
194 | return res; |
195 | } | |
196 | ||
197 | static int | |
198 | rpc_pipe_release(struct inode *inode, struct file *filp) | |
199 | { | |
969b7f25 | 200 | struct rpc_inode *rpci = RPC_I(inode); |
1da177e4 | 201 | struct rpc_pipe_msg *msg; |
e712804a | 202 | int last_close; |
1da177e4 | 203 | |
1b1dcc1b | 204 | mutex_lock(&inode->i_mutex); |
1da177e4 LT |
205 | if (rpci->ops == NULL) |
206 | goto out; | |
207 | msg = (struct rpc_pipe_msg *)filp->private_data; | |
208 | if (msg != NULL) { | |
9842ef35 | 209 | spin_lock(&inode->i_lock); |
48e49187 | 210 | msg->errno = -EAGAIN; |
5a67657a | 211 | list_del_init(&msg->list); |
9842ef35 | 212 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
213 | rpci->ops->destroy_msg(msg); |
214 | } | |
215 | if (filp->f_mode & FMODE_WRITE) | |
216 | rpci->nwriters --; | |
9842ef35 | 217 | if (filp->f_mode & FMODE_READ) { |
1da177e4 | 218 | rpci->nreaders --; |
9842ef35 TM |
219 | if (rpci->nreaders == 0) { |
220 | LIST_HEAD(free_list); | |
221 | spin_lock(&inode->i_lock); | |
222 | list_splice_init(&rpci->pipe, &free_list); | |
223 | rpci->pipelen = 0; | |
224 | spin_unlock(&inode->i_lock); | |
225 | rpc_purge_list(rpci, &free_list, | |
226 | rpci->ops->destroy_msg, -EAGAIN); | |
227 | } | |
228 | } | |
e712804a BF |
229 | last_close = rpci->nwriters == 0 && rpci->nreaders == 0; |
230 | if (last_close && rpci->ops->release_pipe) | |
1da177e4 LT |
231 | rpci->ops->release_pipe(inode); |
232 | out: | |
1b1dcc1b | 233 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
234 | return 0; |
235 | } | |
236 | ||
237 | static ssize_t | |
238 | rpc_pipe_read(struct file *filp, char __user *buf, size_t len, loff_t *offset) | |
239 | { | |
303b46bb | 240 | struct inode *inode = filp->f_path.dentry->d_inode; |
1da177e4 LT |
241 | struct rpc_inode *rpci = RPC_I(inode); |
242 | struct rpc_pipe_msg *msg; | |
243 | int res = 0; | |
244 | ||
1b1dcc1b | 245 | mutex_lock(&inode->i_mutex); |
1da177e4 LT |
246 | if (rpci->ops == NULL) { |
247 | res = -EPIPE; | |
248 | goto out_unlock; | |
249 | } | |
250 | msg = filp->private_data; | |
251 | if (msg == NULL) { | |
9842ef35 | 252 | spin_lock(&inode->i_lock); |
1da177e4 LT |
253 | if (!list_empty(&rpci->pipe)) { |
254 | msg = list_entry(rpci->pipe.next, | |
255 | struct rpc_pipe_msg, | |
256 | list); | |
257 | list_move(&msg->list, &rpci->in_upcall); | |
258 | rpci->pipelen -= msg->len; | |
259 | filp->private_data = msg; | |
260 | msg->copied = 0; | |
261 | } | |
9842ef35 | 262 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
263 | if (msg == NULL) |
264 | goto out_unlock; | |
265 | } | |
266 | /* NOTE: it is up to the callback to update msg->copied */ | |
267 | res = rpci->ops->upcall(filp, msg, buf, len); | |
268 | if (res < 0 || msg->len == msg->copied) { | |
269 | filp->private_data = NULL; | |
9842ef35 | 270 | spin_lock(&inode->i_lock); |
5a67657a | 271 | list_del_init(&msg->list); |
9842ef35 | 272 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
273 | rpci->ops->destroy_msg(msg); |
274 | } | |
275 | out_unlock: | |
1b1dcc1b | 276 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
277 | return res; |
278 | } | |
279 | ||
280 | static ssize_t | |
281 | rpc_pipe_write(struct file *filp, const char __user *buf, size_t len, loff_t *offset) | |
282 | { | |
303b46bb | 283 | struct inode *inode = filp->f_path.dentry->d_inode; |
1da177e4 LT |
284 | struct rpc_inode *rpci = RPC_I(inode); |
285 | int res; | |
286 | ||
1b1dcc1b | 287 | mutex_lock(&inode->i_mutex); |
1da177e4 LT |
288 | res = -EPIPE; |
289 | if (rpci->ops != NULL) | |
290 | res = rpci->ops->downcall(filp, buf, len); | |
1b1dcc1b | 291 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
292 | return res; |
293 | } | |
294 | ||
295 | static unsigned int | |
296 | rpc_pipe_poll(struct file *filp, struct poll_table_struct *wait) | |
297 | { | |
298 | struct rpc_inode *rpci; | |
299 | unsigned int mask = 0; | |
300 | ||
303b46bb | 301 | rpci = RPC_I(filp->f_path.dentry->d_inode); |
1da177e4 LT |
302 | poll_wait(filp, &rpci->waitq, wait); |
303 | ||
304 | mask = POLLOUT | POLLWRNORM; | |
305 | if (rpci->ops == NULL) | |
306 | mask |= POLLERR | POLLHUP; | |
eda4f9b7 | 307 | if (filp->private_data || !list_empty(&rpci->pipe)) |
1da177e4 LT |
308 | mask |= POLLIN | POLLRDNORM; |
309 | return mask; | |
310 | } | |
311 | ||
312 | static int | |
674b604c | 313 | rpc_pipe_ioctl_unlocked(struct file *filp, unsigned int cmd, unsigned long arg) |
1da177e4 | 314 | { |
303b46bb | 315 | struct rpc_inode *rpci = RPC_I(filp->f_path.dentry->d_inode); |
1da177e4 LT |
316 | int len; |
317 | ||
318 | switch (cmd) { | |
319 | case FIONREAD: | |
320 | if (rpci->ops == NULL) | |
321 | return -EPIPE; | |
322 | len = rpci->pipelen; | |
323 | if (filp->private_data) { | |
324 | struct rpc_pipe_msg *msg; | |
325 | msg = (struct rpc_pipe_msg *)filp->private_data; | |
326 | len += msg->len - msg->copied; | |
327 | } | |
328 | return put_user(len, (int __user *)arg); | |
329 | default: | |
330 | return -EINVAL; | |
331 | } | |
332 | } | |
333 | ||
674b604c FW |
334 | static long |
335 | rpc_pipe_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) | |
336 | { | |
337 | long ret; | |
338 | ||
339 | lock_kernel(); | |
340 | ret = rpc_pipe_ioctl_unlocked(filp, cmd, arg); | |
341 | unlock_kernel(); | |
342 | ||
343 | return ret; | |
344 | } | |
345 | ||
da7071d7 | 346 | static const struct file_operations rpc_pipe_fops = { |
1da177e4 LT |
347 | .owner = THIS_MODULE, |
348 | .llseek = no_llseek, | |
349 | .read = rpc_pipe_read, | |
350 | .write = rpc_pipe_write, | |
351 | .poll = rpc_pipe_poll, | |
674b604c | 352 | .unlocked_ioctl = rpc_pipe_ioctl, |
1da177e4 LT |
353 | .open = rpc_pipe_open, |
354 | .release = rpc_pipe_release, | |
355 | }; | |
356 | ||
357 | static int | |
358 | rpc_show_info(struct seq_file *m, void *v) | |
359 | { | |
360 | struct rpc_clnt *clnt = m->private; | |
361 | ||
362 | seq_printf(m, "RPC server: %s\n", clnt->cl_server); | |
363 | seq_printf(m, "service: %s (%d) version %d\n", clnt->cl_protname, | |
364 | clnt->cl_prog, clnt->cl_vers); | |
e7f78657 CL |
365 | seq_printf(m, "address: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_ADDR)); |
366 | seq_printf(m, "protocol: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PROTO)); | |
bf19aace | 367 | seq_printf(m, "port: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PORT)); |
1da177e4 LT |
368 | return 0; |
369 | } | |
370 | ||
371 | static int | |
372 | rpc_info_open(struct inode *inode, struct file *file) | |
373 | { | |
006abe88 | 374 | struct rpc_clnt *clnt = NULL; |
1da177e4 LT |
375 | int ret = single_open(file, rpc_show_info, NULL); |
376 | ||
377 | if (!ret) { | |
378 | struct seq_file *m = file->private_data; | |
006abe88 TM |
379 | |
380 | spin_lock(&file->f_path.dentry->d_lock); | |
381 | if (!d_unhashed(file->f_path.dentry)) | |
382 | clnt = RPC_I(inode)->private; | |
383 | if (clnt != NULL && atomic_inc_not_zero(&clnt->cl_count)) { | |
384 | spin_unlock(&file->f_path.dentry->d_lock); | |
1da177e4 LT |
385 | m->private = clnt; |
386 | } else { | |
006abe88 | 387 | spin_unlock(&file->f_path.dentry->d_lock); |
1da177e4 LT |
388 | single_release(inode, file); |
389 | ret = -EINVAL; | |
390 | } | |
1da177e4 LT |
391 | } |
392 | return ret; | |
393 | } | |
394 | ||
395 | static int | |
396 | rpc_info_release(struct inode *inode, struct file *file) | |
397 | { | |
398 | struct seq_file *m = file->private_data; | |
399 | struct rpc_clnt *clnt = (struct rpc_clnt *)m->private; | |
400 | ||
401 | if (clnt) | |
402 | rpc_release_client(clnt); | |
403 | return single_release(inode, file); | |
404 | } | |
405 | ||
da7071d7 | 406 | static const struct file_operations rpc_info_operations = { |
1da177e4 LT |
407 | .owner = THIS_MODULE, |
408 | .open = rpc_info_open, | |
409 | .read = seq_read, | |
410 | .llseek = seq_lseek, | |
411 | .release = rpc_info_release, | |
412 | }; | |
413 | ||
414 | ||
1da177e4 LT |
415 | /* |
416 | * Description of fs contents. | |
417 | */ | |
418 | struct rpc_filelist { | |
ac6fecee | 419 | const char *name; |
99ac48f5 | 420 | const struct file_operations *i_fop; |
7364af6a | 421 | umode_t mode; |
1da177e4 LT |
422 | }; |
423 | ||
54281548 | 424 | struct vfsmount *rpc_get_mount(void) |
1da177e4 | 425 | { |
54281548 TM |
426 | int err; |
427 | ||
1f5ce9e9 | 428 | err = simple_pin_fs(&rpc_pipe_fs_type, &rpc_mount, &rpc_mount_count); |
54281548 TM |
429 | if (err != 0) |
430 | return ERR_PTR(err); | |
431 | return rpc_mount; | |
1da177e4 | 432 | } |
e571cbf1 | 433 | EXPORT_SYMBOL_GPL(rpc_get_mount); |
1da177e4 | 434 | |
54281548 | 435 | void rpc_put_mount(void) |
1da177e4 LT |
436 | { |
437 | simple_release_fs(&rpc_mount, &rpc_mount_count); | |
438 | } | |
e571cbf1 | 439 | EXPORT_SYMBOL_GPL(rpc_put_mount); |
1da177e4 | 440 | |
62e1761c TM |
441 | static int rpc_delete_dentry(struct dentry *dentry) |
442 | { | |
443 | return 1; | |
444 | } | |
445 | ||
3ba13d17 | 446 | static const struct dentry_operations rpc_dentry_operations = { |
62e1761c TM |
447 | .d_delete = rpc_delete_dentry, |
448 | }; | |
449 | ||
1da177e4 | 450 | static struct inode * |
7364af6a | 451 | rpc_get_inode(struct super_block *sb, umode_t mode) |
1da177e4 LT |
452 | { |
453 | struct inode *inode = new_inode(sb); | |
454 | if (!inode) | |
455 | return NULL; | |
456 | inode->i_mode = mode; | |
1da177e4 LT |
457 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
458 | switch(mode & S_IFMT) { | |
459 | case S_IFDIR: | |
460 | inode->i_fop = &simple_dir_operations; | |
461 | inode->i_op = &simple_dir_inode_operations; | |
d8c76e6f | 462 | inc_nlink(inode); |
1da177e4 LT |
463 | default: |
464 | break; | |
465 | } | |
466 | return inode; | |
467 | } | |
468 | ||
7589806e TM |
469 | static int __rpc_create_common(struct inode *dir, struct dentry *dentry, |
470 | umode_t mode, | |
471 | const struct file_operations *i_fop, | |
472 | void *private) | |
473 | { | |
474 | struct inode *inode; | |
475 | ||
476 | BUG_ON(!d_unhashed(dentry)); | |
477 | inode = rpc_get_inode(dir->i_sb, mode); | |
478 | if (!inode) | |
479 | goto out_err; | |
480 | inode->i_ino = iunique(dir->i_sb, 100); | |
481 | if (i_fop) | |
482 | inode->i_fop = i_fop; | |
483 | if (private) | |
484 | rpc_inode_setowner(inode, private); | |
485 | d_add(dentry, inode); | |
486 | return 0; | |
487 | out_err: | |
488 | printk(KERN_WARNING "%s: %s failed to allocate inode for dentry %s\n", | |
489 | __FILE__, __func__, dentry->d_name.name); | |
490 | dput(dentry); | |
491 | return -ENOMEM; | |
492 | } | |
493 | ||
ac6fecee TM |
494 | static int __rpc_create(struct inode *dir, struct dentry *dentry, |
495 | umode_t mode, | |
496 | const struct file_operations *i_fop, | |
497 | void *private) | |
498 | { | |
499 | int err; | |
500 | ||
501 | err = __rpc_create_common(dir, dentry, S_IFREG | mode, i_fop, private); | |
502 | if (err) | |
503 | return err; | |
504 | fsnotify_create(dir, dentry); | |
505 | return 0; | |
506 | } | |
507 | ||
7589806e TM |
508 | static int __rpc_mkdir(struct inode *dir, struct dentry *dentry, |
509 | umode_t mode, | |
510 | const struct file_operations *i_fop, | |
511 | void *private) | |
512 | { | |
513 | int err; | |
514 | ||
515 | err = __rpc_create_common(dir, dentry, S_IFDIR | mode, i_fop, private); | |
516 | if (err) | |
517 | return err; | |
518 | inc_nlink(dir); | |
519 | fsnotify_mkdir(dir, dentry); | |
520 | return 0; | |
521 | } | |
522 | ||
523 | static int __rpc_mkpipe(struct inode *dir, struct dentry *dentry, | |
524 | umode_t mode, | |
525 | const struct file_operations *i_fop, | |
526 | void *private, | |
527 | const struct rpc_pipe_ops *ops, | |
528 | int flags) | |
529 | { | |
530 | struct rpc_inode *rpci; | |
531 | int err; | |
532 | ||
533 | err = __rpc_create_common(dir, dentry, S_IFIFO | mode, i_fop, private); | |
534 | if (err) | |
535 | return err; | |
536 | rpci = RPC_I(dentry->d_inode); | |
537 | rpci->nkern_readwriters = 1; | |
538 | rpci->private = private; | |
539 | rpci->flags = flags; | |
540 | rpci->ops = ops; | |
541 | fsnotify_create(dir, dentry); | |
542 | return 0; | |
543 | } | |
544 | ||
ac6fecee TM |
545 | static int __rpc_rmdir(struct inode *dir, struct dentry *dentry) |
546 | { | |
547 | int ret; | |
548 | ||
549 | dget(dentry); | |
550 | ret = simple_rmdir(dir, dentry); | |
551 | d_delete(dentry); | |
552 | dput(dentry); | |
553 | return ret; | |
554 | } | |
555 | ||
810d90bc TM |
556 | static int __rpc_unlink(struct inode *dir, struct dentry *dentry) |
557 | { | |
558 | int ret; | |
559 | ||
560 | dget(dentry); | |
561 | ret = simple_unlink(dir, dentry); | |
562 | d_delete(dentry); | |
563 | dput(dentry); | |
564 | return ret; | |
565 | } | |
566 | ||
567 | static int __rpc_rmpipe(struct inode *dir, struct dentry *dentry) | |
568 | { | |
569 | struct inode *inode = dentry->d_inode; | |
570 | struct rpc_inode *rpci = RPC_I(inode); | |
571 | ||
572 | rpci->nkern_readwriters--; | |
573 | if (rpci->nkern_readwriters != 0) | |
574 | return 0; | |
575 | rpc_close_pipes(inode); | |
576 | return __rpc_unlink(dir, dentry); | |
577 | } | |
578 | ||
cfeaa4a3 TM |
579 | static struct dentry *__rpc_lookup_create(struct dentry *parent, |
580 | struct qstr *name) | |
581 | { | |
582 | struct dentry *dentry; | |
583 | ||
584 | dentry = d_lookup(parent, name); | |
585 | if (!dentry) { | |
586 | dentry = d_alloc(parent, name); | |
587 | if (!dentry) { | |
588 | dentry = ERR_PTR(-ENOMEM); | |
589 | goto out_err; | |
590 | } | |
591 | } | |
592 | if (!dentry->d_inode) | |
593 | dentry->d_op = &rpc_dentry_operations; | |
594 | out_err: | |
595 | return dentry; | |
596 | } | |
597 | ||
598 | static struct dentry *__rpc_lookup_create_exclusive(struct dentry *parent, | |
599 | struct qstr *name) | |
600 | { | |
601 | struct dentry *dentry; | |
602 | ||
603 | dentry = __rpc_lookup_create(parent, name); | |
f1f0abe1 DC |
604 | if (IS_ERR(dentry)) |
605 | return dentry; | |
cfeaa4a3 TM |
606 | if (dentry->d_inode == NULL) |
607 | return dentry; | |
608 | dput(dentry); | |
609 | return ERR_PTR(-EEXIST); | |
610 | } | |
611 | ||
1da177e4 LT |
612 | /* |
613 | * FIXME: This probably has races. | |
614 | */ | |
ac6fecee TM |
615 | static void __rpc_depopulate(struct dentry *parent, |
616 | const struct rpc_filelist *files, | |
617 | int start, int eof) | |
1da177e4 LT |
618 | { |
619 | struct inode *dir = parent->d_inode; | |
ac6fecee TM |
620 | struct dentry *dentry; |
621 | struct qstr name; | |
622 | int i; | |
1da177e4 | 623 | |
ac6fecee TM |
624 | for (i = start; i < eof; i++) { |
625 | name.name = files[i].name; | |
626 | name.len = strlen(files[i].name); | |
627 | name.hash = full_name_hash(name.name, name.len); | |
628 | dentry = d_lookup(parent, &name); | |
629 | ||
630 | if (dentry == NULL) | |
62e1761c | 631 | continue; |
ac6fecee TM |
632 | if (dentry->d_inode == NULL) |
633 | goto next; | |
634 | switch (dentry->d_inode->i_mode & S_IFMT) { | |
635 | default: | |
636 | BUG(); | |
637 | case S_IFREG: | |
638 | __rpc_unlink(dir, dentry); | |
1da177e4 | 639 | break; |
ac6fecee TM |
640 | case S_IFDIR: |
641 | __rpc_rmdir(dir, dentry); | |
642 | } | |
643 | next: | |
644 | dput(dentry); | |
1da177e4 | 645 | } |
ac6fecee TM |
646 | } |
647 | ||
648 | static void rpc_depopulate(struct dentry *parent, | |
649 | const struct rpc_filelist *files, | |
650 | int start, int eof) | |
651 | { | |
652 | struct inode *dir = parent->d_inode; | |
653 | ||
654 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_CHILD); | |
655 | __rpc_depopulate(parent, files, start, eof); | |
1b1dcc1b | 656 | mutex_unlock(&dir->i_mutex); |
1da177e4 LT |
657 | } |
658 | ||
ac6fecee TM |
659 | static int rpc_populate(struct dentry *parent, |
660 | const struct rpc_filelist *files, | |
661 | int start, int eof, | |
662 | void *private) | |
1da177e4 | 663 | { |
ac6fecee | 664 | struct inode *dir = parent->d_inode; |
1da177e4 | 665 | struct dentry *dentry; |
ac6fecee | 666 | int i, err; |
1da177e4 | 667 | |
1b1dcc1b | 668 | mutex_lock(&dir->i_mutex); |
1da177e4 | 669 | for (i = start; i < eof; i++) { |
ac6fecee TM |
670 | struct qstr q; |
671 | ||
672 | q.name = files[i].name; | |
673 | q.len = strlen(files[i].name); | |
674 | q.hash = full_name_hash(q.name, q.len); | |
675 | dentry = __rpc_lookup_create_exclusive(parent, &q); | |
676 | err = PTR_ERR(dentry); | |
677 | if (IS_ERR(dentry)) | |
1da177e4 | 678 | goto out_bad; |
ac6fecee TM |
679 | switch (files[i].mode & S_IFMT) { |
680 | default: | |
681 | BUG(); | |
682 | case S_IFREG: | |
683 | err = __rpc_create(dir, dentry, | |
684 | files[i].mode, | |
685 | files[i].i_fop, | |
686 | private); | |
687 | break; | |
688 | case S_IFDIR: | |
689 | err = __rpc_mkdir(dir, dentry, | |
690 | files[i].mode, | |
691 | NULL, | |
692 | private); | |
1da177e4 | 693 | } |
ac6fecee TM |
694 | if (err != 0) |
695 | goto out_bad; | |
1da177e4 | 696 | } |
1b1dcc1b | 697 | mutex_unlock(&dir->i_mutex); |
1da177e4 LT |
698 | return 0; |
699 | out_bad: | |
ac6fecee | 700 | __rpc_depopulate(parent, files, start, eof); |
1b1dcc1b | 701 | mutex_unlock(&dir->i_mutex); |
1da177e4 | 702 | printk(KERN_WARNING "%s: %s failed to populate directory %s\n", |
0dc47877 | 703 | __FILE__, __func__, parent->d_name.name); |
ac6fecee | 704 | return err; |
f134585a | 705 | } |
1da177e4 | 706 | |
e57aed77 TM |
707 | static struct dentry *rpc_mkdir_populate(struct dentry *parent, |
708 | struct qstr *name, umode_t mode, void *private, | |
709 | int (*populate)(struct dentry *, void *), void *args_populate) | |
f134585a | 710 | { |
f134585a | 711 | struct dentry *dentry; |
7d59d1e8 | 712 | struct inode *dir = parent->d_inode; |
f134585a TM |
713 | int error; |
714 | ||
7d59d1e8 TM |
715 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); |
716 | dentry = __rpc_lookup_create_exclusive(parent, name); | |
f134585a | 717 | if (IS_ERR(dentry)) |
7d59d1e8 TM |
718 | goto out; |
719 | error = __rpc_mkdir(dir, dentry, mode, NULL, private); | |
7589806e TM |
720 | if (error != 0) |
721 | goto out_err; | |
e57aed77 TM |
722 | if (populate != NULL) { |
723 | error = populate(dentry, args_populate); | |
724 | if (error) | |
725 | goto err_rmdir; | |
726 | } | |
f134585a | 727 | out: |
1b1dcc1b | 728 | mutex_unlock(&dir->i_mutex); |
5c3e985a | 729 | return dentry; |
ac6fecee | 730 | err_rmdir: |
f134585a | 731 | __rpc_rmdir(dir, dentry); |
7589806e | 732 | out_err: |
f134585a TM |
733 | dentry = ERR_PTR(error); |
734 | goto out; | |
1da177e4 LT |
735 | } |
736 | ||
e57aed77 TM |
737 | static int rpc_rmdir_depopulate(struct dentry *dentry, |
738 | void (*depopulate)(struct dentry *)) | |
1da177e4 | 739 | { |
dff02cc1 | 740 | struct dentry *parent; |
f134585a TM |
741 | struct inode *dir; |
742 | int error; | |
278c995c | 743 | |
dff02cc1 TM |
744 | parent = dget_parent(dentry); |
745 | dir = parent->d_inode; | |
c6573c29 | 746 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); |
e57aed77 TM |
747 | if (depopulate != NULL) |
748 | depopulate(dentry); | |
f134585a | 749 | error = __rpc_rmdir(dir, dentry); |
1b1dcc1b | 750 | mutex_unlock(&dir->i_mutex); |
dff02cc1 | 751 | dput(parent); |
f134585a | 752 | return error; |
1da177e4 LT |
753 | } |
754 | ||
93a44a75 BF |
755 | /** |
756 | * rpc_mkpipe - make an rpc_pipefs file for kernel<->userspace communication | |
757 | * @parent: dentry of directory to create new "pipe" in | |
758 | * @name: name of pipe | |
759 | * @private: private data to associate with the pipe, for the caller's use | |
760 | * @ops: operations defining the behavior of the pipe: upcall, downcall, | |
c3810608 | 761 | * release_pipe, open_pipe, and destroy_msg. |
65b6e42c | 762 | * @flags: rpc_inode flags |
93a44a75 BF |
763 | * |
764 | * Data is made available for userspace to read by calls to | |
765 | * rpc_queue_upcall(). The actual reads will result in calls to | |
766 | * @ops->upcall, which will be called with the file pointer, | |
767 | * message, and userspace buffer to copy to. | |
768 | * | |
769 | * Writes can come at any time, and do not necessarily have to be | |
770 | * responses to upcalls. They will result in calls to @msg->downcall. | |
771 | * | |
772 | * The @private argument passed here will be available to all these methods | |
773 | * from the file pointer, via RPC_I(file->f_dentry->d_inode)->private. | |
774 | */ | |
b693ba4a TM |
775 | struct dentry *rpc_mkpipe(struct dentry *parent, const char *name, |
776 | void *private, const struct rpc_pipe_ops *ops, | |
777 | int flags) | |
1da177e4 | 778 | { |
1da177e4 | 779 | struct dentry *dentry; |
7589806e | 780 | struct inode *dir = parent->d_inode; |
7364af6a | 781 | umode_t umode = S_IFIFO | S_IRUSR | S_IWUSR; |
cfeaa4a3 | 782 | struct qstr q; |
7589806e | 783 | int err; |
7364af6a TM |
784 | |
785 | if (ops->upcall == NULL) | |
786 | umode &= ~S_IRUGO; | |
787 | if (ops->downcall == NULL) | |
788 | umode &= ~S_IWUGO; | |
1da177e4 | 789 | |
cfeaa4a3 TM |
790 | q.name = name; |
791 | q.len = strlen(name); | |
792 | q.hash = full_name_hash(q.name, q.len), | |
793 | ||
794 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); | |
795 | dentry = __rpc_lookup_create(parent, &q); | |
1da177e4 | 796 | if (IS_ERR(dentry)) |
cfeaa4a3 | 797 | goto out; |
34f30896 | 798 | if (dentry->d_inode) { |
7589806e | 799 | struct rpc_inode *rpci = RPC_I(dentry->d_inode); |
34f30896 TM |
800 | if (rpci->private != private || |
801 | rpci->ops != ops || | |
802 | rpci->flags != flags) { | |
803 | dput (dentry); | |
810d90bc TM |
804 | err = -EBUSY; |
805 | goto out_err; | |
34f30896 | 806 | } |
03a1256f | 807 | rpci->nkern_readwriters++; |
34f30896 TM |
808 | goto out; |
809 | } | |
7589806e TM |
810 | |
811 | err = __rpc_mkpipe(dir, dentry, umode, &rpc_pipe_fops, | |
810d90bc | 812 | private, ops, flags); |
7589806e TM |
813 | if (err) |
814 | goto out_err; | |
f134585a | 815 | out: |
1b1dcc1b | 816 | mutex_unlock(&dir->i_mutex); |
5c3e985a | 817 | return dentry; |
7589806e TM |
818 | out_err: |
819 | dentry = ERR_PTR(err); | |
158998b6 | 820 | printk(KERN_WARNING "%s: %s() failed to create pipe %s/%s (errno = %d)\n", |
0dc47877 | 821 | __FILE__, __func__, parent->d_name.name, name, |
7589806e | 822 | err); |
f134585a | 823 | goto out; |
1da177e4 | 824 | } |
468039ee | 825 | EXPORT_SYMBOL_GPL(rpc_mkpipe); |
1da177e4 | 826 | |
93a44a75 BF |
827 | /** |
828 | * rpc_unlink - remove a pipe | |
829 | * @dentry: dentry for the pipe, as returned from rpc_mkpipe | |
830 | * | |
831 | * After this call, lookups will no longer find the pipe, and any | |
832 | * attempts to read or write using preexisting opens of the pipe will | |
833 | * return -EPIPE. | |
834 | */ | |
f134585a | 835 | int |
5d67476f | 836 | rpc_unlink(struct dentry *dentry) |
1da177e4 | 837 | { |
5d67476f | 838 | struct dentry *parent; |
f134585a | 839 | struct inode *dir; |
5d67476f | 840 | int error = 0; |
1da177e4 | 841 | |
5d67476f TM |
842 | parent = dget_parent(dentry); |
843 | dir = parent->d_inode; | |
c6573c29 | 844 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); |
810d90bc | 845 | error = __rpc_rmpipe(dir, dentry); |
1b1dcc1b | 846 | mutex_unlock(&dir->i_mutex); |
5d67476f | 847 | dput(parent); |
f134585a | 848 | return error; |
1da177e4 | 849 | } |
468039ee | 850 | EXPORT_SYMBOL_GPL(rpc_unlink); |
1da177e4 | 851 | |
e57aed77 TM |
852 | enum { |
853 | RPCAUTH_info, | |
854 | RPCAUTH_EOF | |
855 | }; | |
856 | ||
857 | static const struct rpc_filelist authfiles[] = { | |
858 | [RPCAUTH_info] = { | |
859 | .name = "info", | |
860 | .i_fop = &rpc_info_operations, | |
861 | .mode = S_IFREG | S_IRUSR, | |
862 | }, | |
863 | }; | |
864 | ||
865 | static int rpc_clntdir_populate(struct dentry *dentry, void *private) | |
866 | { | |
867 | return rpc_populate(dentry, | |
868 | authfiles, RPCAUTH_info, RPCAUTH_EOF, | |
869 | private); | |
870 | } | |
871 | ||
872 | static void rpc_clntdir_depopulate(struct dentry *dentry) | |
873 | { | |
874 | rpc_depopulate(dentry, authfiles, RPCAUTH_info, RPCAUTH_EOF); | |
875 | } | |
876 | ||
7d59d1e8 TM |
877 | /** |
878 | * rpc_create_client_dir - Create a new rpc_client directory in rpc_pipefs | |
4111d4fd RD |
879 | * @dentry: dentry from the rpc_pipefs root to the new directory |
880 | * @name: &struct qstr for the name | |
7d59d1e8 TM |
881 | * @rpc_client: rpc client to associate with this directory |
882 | * | |
883 | * This creates a directory at the given @path associated with | |
884 | * @rpc_clnt, which will contain a file named "info" with some basic | |
885 | * information about the client, together with any "pipes" that may | |
886 | * later be created using rpc_mkpipe(). | |
887 | */ | |
23ac6581 | 888 | struct dentry *rpc_create_client_dir(struct dentry *dentry, |
e57aed77 TM |
889 | struct qstr *name, |
890 | struct rpc_clnt *rpc_client) | |
891 | { | |
892 | return rpc_mkdir_populate(dentry, name, S_IRUGO | S_IXUGO, NULL, | |
893 | rpc_clntdir_populate, rpc_client); | |
894 | } | |
895 | ||
896 | /** | |
897 | * rpc_remove_client_dir - Remove a directory created with rpc_create_client_dir() | |
898 | * @dentry: directory to remove | |
899 | */ | |
900 | int rpc_remove_client_dir(struct dentry *dentry) | |
7d59d1e8 | 901 | { |
e57aed77 | 902 | return rpc_rmdir_depopulate(dentry, rpc_clntdir_depopulate); |
7d59d1e8 TM |
903 | } |
904 | ||
8854e82d TM |
905 | static const struct rpc_filelist cache_pipefs_files[3] = { |
906 | [0] = { | |
907 | .name = "channel", | |
908 | .i_fop = &cache_file_operations_pipefs, | |
96c61cbd | 909 | .mode = S_IFREG|S_IRUSR|S_IWUSR, |
8854e82d TM |
910 | }, |
911 | [1] = { | |
912 | .name = "content", | |
913 | .i_fop = &content_file_operations_pipefs, | |
914 | .mode = S_IFREG|S_IRUSR, | |
915 | }, | |
916 | [2] = { | |
917 | .name = "flush", | |
918 | .i_fop = &cache_flush_operations_pipefs, | |
919 | .mode = S_IFREG|S_IRUSR|S_IWUSR, | |
920 | }, | |
921 | }; | |
922 | ||
923 | static int rpc_cachedir_populate(struct dentry *dentry, void *private) | |
924 | { | |
925 | return rpc_populate(dentry, | |
926 | cache_pipefs_files, 0, 3, | |
927 | private); | |
928 | } | |
929 | ||
930 | static void rpc_cachedir_depopulate(struct dentry *dentry) | |
931 | { | |
932 | rpc_depopulate(dentry, cache_pipefs_files, 0, 3); | |
933 | } | |
934 | ||
935 | struct dentry *rpc_create_cache_dir(struct dentry *parent, struct qstr *name, | |
936 | mode_t umode, struct cache_detail *cd) | |
937 | { | |
938 | return rpc_mkdir_populate(parent, name, umode, NULL, | |
939 | rpc_cachedir_populate, cd); | |
940 | } | |
941 | ||
942 | void rpc_remove_cache_dir(struct dentry *dentry) | |
943 | { | |
944 | rpc_rmdir_depopulate(dentry, rpc_cachedir_depopulate); | |
945 | } | |
946 | ||
1da177e4 LT |
947 | /* |
948 | * populate the filesystem | |
949 | */ | |
b87221de | 950 | static const struct super_operations s_ops = { |
1da177e4 LT |
951 | .alloc_inode = rpc_alloc_inode, |
952 | .destroy_inode = rpc_destroy_inode, | |
953 | .statfs = simple_statfs, | |
954 | }; | |
955 | ||
956 | #define RPCAUTH_GSSMAGIC 0x67596969 | |
957 | ||
bb156749 TM |
958 | /* |
959 | * We have a single directory with 1 node in it. | |
960 | */ | |
961 | enum { | |
962 | RPCAUTH_lockd, | |
963 | RPCAUTH_mount, | |
964 | RPCAUTH_nfs, | |
965 | RPCAUTH_portmap, | |
966 | RPCAUTH_statd, | |
967 | RPCAUTH_nfsd4_cb, | |
e571cbf1 | 968 | RPCAUTH_cache, |
bb156749 TM |
969 | RPCAUTH_RootEOF |
970 | }; | |
971 | ||
972 | static const struct rpc_filelist files[] = { | |
973 | [RPCAUTH_lockd] = { | |
974 | .name = "lockd", | |
975 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
976 | }, | |
977 | [RPCAUTH_mount] = { | |
978 | .name = "mount", | |
979 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
980 | }, | |
981 | [RPCAUTH_nfs] = { | |
982 | .name = "nfs", | |
983 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
984 | }, | |
985 | [RPCAUTH_portmap] = { | |
986 | .name = "portmap", | |
987 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
988 | }, | |
989 | [RPCAUTH_statd] = { | |
990 | .name = "statd", | |
991 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
992 | }, | |
993 | [RPCAUTH_nfsd4_cb] = { | |
994 | .name = "nfsd4_cb", | |
995 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
996 | }, | |
e571cbf1 TM |
997 | [RPCAUTH_cache] = { |
998 | .name = "cache", | |
999 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
1000 | }, | |
bb156749 TM |
1001 | }; |
1002 | ||
1da177e4 LT |
1003 | static int |
1004 | rpc_fill_super(struct super_block *sb, void *data, int silent) | |
1005 | { | |
1006 | struct inode *inode; | |
1007 | struct dentry *root; | |
1008 | ||
1009 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
1010 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
1011 | sb->s_magic = RPCAUTH_GSSMAGIC; | |
1012 | sb->s_op = &s_ops; | |
1013 | sb->s_time_gran = 1; | |
1014 | ||
1015 | inode = rpc_get_inode(sb, S_IFDIR | 0755); | |
1016 | if (!inode) | |
1017 | return -ENOMEM; | |
fc7bed8c | 1018 | sb->s_root = root = d_alloc_root(inode); |
1da177e4 LT |
1019 | if (!root) { |
1020 | iput(inode); | |
1021 | return -ENOMEM; | |
1022 | } | |
ac6fecee | 1023 | if (rpc_populate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF, NULL)) |
fc7bed8c | 1024 | return -ENOMEM; |
1da177e4 | 1025 | return 0; |
1da177e4 LT |
1026 | } |
1027 | ||
454e2398 | 1028 | static int |
1da177e4 | 1029 | rpc_get_sb(struct file_system_type *fs_type, |
454e2398 | 1030 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) |
1da177e4 | 1031 | { |
454e2398 | 1032 | return get_sb_single(fs_type, flags, data, rpc_fill_super, mnt); |
1da177e4 LT |
1033 | } |
1034 | ||
1035 | static struct file_system_type rpc_pipe_fs_type = { | |
1036 | .owner = THIS_MODULE, | |
1037 | .name = "rpc_pipefs", | |
1038 | .get_sb = rpc_get_sb, | |
1039 | .kill_sb = kill_litter_super, | |
1040 | }; | |
1041 | ||
1042 | static void | |
51cc5068 | 1043 | init_once(void *foo) |
1da177e4 LT |
1044 | { |
1045 | struct rpc_inode *rpci = (struct rpc_inode *) foo; | |
1046 | ||
a35afb83 CL |
1047 | inode_init_once(&rpci->vfs_inode); |
1048 | rpci->private = NULL; | |
1049 | rpci->nreaders = 0; | |
1050 | rpci->nwriters = 0; | |
1051 | INIT_LIST_HEAD(&rpci->in_upcall); | |
6e84c7b6 | 1052 | INIT_LIST_HEAD(&rpci->in_downcall); |
a35afb83 CL |
1053 | INIT_LIST_HEAD(&rpci->pipe); |
1054 | rpci->pipelen = 0; | |
1055 | init_waitqueue_head(&rpci->waitq); | |
1056 | INIT_DELAYED_WORK(&rpci->queue_timeout, | |
1057 | rpc_timeout_upcall_queue); | |
1058 | rpci->ops = NULL; | |
1da177e4 LT |
1059 | } |
1060 | ||
1061 | int register_rpc_pipefs(void) | |
1062 | { | |
5bd5f581 AM |
1063 | int err; |
1064 | ||
1da177e4 | 1065 | rpc_inode_cachep = kmem_cache_create("rpc_inode_cache", |
fffb60f9 PJ |
1066 | sizeof(struct rpc_inode), |
1067 | 0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| | |
1068 | SLAB_MEM_SPREAD), | |
20c2df83 | 1069 | init_once); |
1da177e4 LT |
1070 | if (!rpc_inode_cachep) |
1071 | return -ENOMEM; | |
5bd5f581 AM |
1072 | err = register_filesystem(&rpc_pipe_fs_type); |
1073 | if (err) { | |
1074 | kmem_cache_destroy(rpc_inode_cachep); | |
1075 | return err; | |
1076 | } | |
1077 | ||
1da177e4 LT |
1078 | return 0; |
1079 | } | |
1080 | ||
1081 | void unregister_rpc_pipefs(void) | |
1082 | { | |
1a1d92c1 | 1083 | kmem_cache_destroy(rpc_inode_cachep); |
1da177e4 LT |
1084 | unregister_filesystem(&rpc_pipe_fs_type); |
1085 | } |