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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> |
021c68de | 30 | #include <linux/nsproxy.h> |
2d00131a | 31 | #include <linux/notifier.h> |
021c68de SK |
32 | |
33 | #include "netns.h" | |
2d00131a | 34 | #include "sunrpc.h" |
1da177e4 | 35 | |
fc14f2fe | 36 | static struct vfsmount *rpc_mnt __read_mostly; |
1da177e4 LT |
37 | static int rpc_mount_count; |
38 | ||
39 | static struct file_system_type rpc_pipe_fs_type; | |
40 | ||
41 | ||
e18b890b | 42 | static struct kmem_cache *rpc_inode_cachep __read_mostly; |
1da177e4 LT |
43 | |
44 | #define RPC_UPCALL_TIMEOUT (30*HZ) | |
45 | ||
2d00131a SK |
46 | static BLOCKING_NOTIFIER_HEAD(rpc_pipefs_notifier_list); |
47 | ||
48 | int rpc_pipefs_notifier_register(struct notifier_block *nb) | |
49 | { | |
50 | return blocking_notifier_chain_cond_register(&rpc_pipefs_notifier_list, nb); | |
51 | } | |
52 | EXPORT_SYMBOL_GPL(rpc_pipefs_notifier_register); | |
53 | ||
54 | void rpc_pipefs_notifier_unregister(struct notifier_block *nb) | |
55 | { | |
56 | blocking_notifier_chain_unregister(&rpc_pipefs_notifier_list, nb); | |
57 | } | |
58 | EXPORT_SYMBOL_GPL(rpc_pipefs_notifier_unregister); | |
59 | ||
9842ef35 TM |
60 | static void rpc_purge_list(struct rpc_inode *rpci, struct list_head *head, |
61 | void (*destroy_msg)(struct rpc_pipe_msg *), int err) | |
1da177e4 | 62 | { |
1da177e4 LT |
63 | struct rpc_pipe_msg *msg; |
64 | ||
9842ef35 TM |
65 | if (list_empty(head)) |
66 | return; | |
67 | do { | |
b3eb67a2 | 68 | msg = list_entry(head->next, struct rpc_pipe_msg, list); |
5a67657a | 69 | list_del_init(&msg->list); |
1da177e4 | 70 | msg->errno = err; |
b3eb67a2 | 71 | destroy_msg(msg); |
9842ef35 | 72 | } while (!list_empty(head)); |
1da177e4 LT |
73 | wake_up(&rpci->waitq); |
74 | } | |
75 | ||
76 | static void | |
65f27f38 | 77 | rpc_timeout_upcall_queue(struct work_struct *work) |
1da177e4 | 78 | { |
9842ef35 | 79 | LIST_HEAD(free_list); |
65f27f38 DH |
80 | struct rpc_inode *rpci = |
81 | container_of(work, struct rpc_inode, queue_timeout.work); | |
1da177e4 | 82 | struct inode *inode = &rpci->vfs_inode; |
9842ef35 | 83 | void (*destroy_msg)(struct rpc_pipe_msg *); |
1da177e4 | 84 | |
9842ef35 TM |
85 | spin_lock(&inode->i_lock); |
86 | if (rpci->ops == NULL) { | |
87 | spin_unlock(&inode->i_lock); | |
88 | return; | |
89 | } | |
90 | destroy_msg = rpci->ops->destroy_msg; | |
91 | if (rpci->nreaders == 0) { | |
92 | list_splice_init(&rpci->pipe, &free_list); | |
93 | rpci->pipelen = 0; | |
94 | } | |
95 | spin_unlock(&inode->i_lock); | |
96 | rpc_purge_list(rpci, &free_list, destroy_msg, -ETIMEDOUT); | |
1da177e4 LT |
97 | } |
98 | ||
c1225158 PT |
99 | ssize_t rpc_pipe_generic_upcall(struct file *filp, struct rpc_pipe_msg *msg, |
100 | char __user *dst, size_t buflen) | |
101 | { | |
102 | char *data = (char *)msg->data + msg->copied; | |
103 | size_t mlen = min(msg->len - msg->copied, buflen); | |
104 | unsigned long left; | |
105 | ||
106 | left = copy_to_user(dst, data, mlen); | |
107 | if (left == mlen) { | |
108 | msg->errno = -EFAULT; | |
109 | return -EFAULT; | |
110 | } | |
111 | ||
112 | mlen -= left; | |
113 | msg->copied += mlen; | |
114 | msg->errno = 0; | |
115 | return mlen; | |
116 | } | |
117 | EXPORT_SYMBOL_GPL(rpc_pipe_generic_upcall); | |
118 | ||
93a44a75 | 119 | /** |
1a5778aa | 120 | * rpc_queue_upcall - queue an upcall message to userspace |
93a44a75 BF |
121 | * @inode: inode of upcall pipe on which to queue given message |
122 | * @msg: message to queue | |
123 | * | |
124 | * Call with an @inode created by rpc_mkpipe() to queue an upcall. | |
125 | * A userspace process may then later read the upcall by performing a | |
126 | * read on an open file for this inode. It is up to the caller to | |
127 | * initialize the fields of @msg (other than @msg->list) appropriately. | |
128 | */ | |
1da177e4 LT |
129 | int |
130 | rpc_queue_upcall(struct inode *inode, struct rpc_pipe_msg *msg) | |
131 | { | |
132 | struct rpc_inode *rpci = RPC_I(inode); | |
6070fe6f | 133 | int res = -EPIPE; |
1da177e4 | 134 | |
9842ef35 | 135 | spin_lock(&inode->i_lock); |
6070fe6f TM |
136 | if (rpci->ops == NULL) |
137 | goto out; | |
1da177e4 LT |
138 | if (rpci->nreaders) { |
139 | list_add_tail(&msg->list, &rpci->pipe); | |
140 | rpci->pipelen += msg->len; | |
6070fe6f | 141 | res = 0; |
1da177e4 LT |
142 | } else if (rpci->flags & RPC_PIPE_WAIT_FOR_OPEN) { |
143 | if (list_empty(&rpci->pipe)) | |
24c5d9d7 TM |
144 | queue_delayed_work(rpciod_workqueue, |
145 | &rpci->queue_timeout, | |
1da177e4 LT |
146 | RPC_UPCALL_TIMEOUT); |
147 | list_add_tail(&msg->list, &rpci->pipe); | |
148 | rpci->pipelen += msg->len; | |
6070fe6f TM |
149 | res = 0; |
150 | } | |
151 | out: | |
9842ef35 | 152 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
153 | wake_up(&rpci->waitq); |
154 | return res; | |
155 | } | |
468039ee | 156 | EXPORT_SYMBOL_GPL(rpc_queue_upcall); |
1da177e4 | 157 | |
6070fe6f TM |
158 | static inline void |
159 | rpc_inode_setowner(struct inode *inode, void *private) | |
160 | { | |
161 | RPC_I(inode)->private = private; | |
162 | } | |
163 | ||
1da177e4 LT |
164 | static void |
165 | rpc_close_pipes(struct inode *inode) | |
166 | { | |
167 | struct rpc_inode *rpci = RPC_I(inode); | |
b693ba4a | 168 | const struct rpc_pipe_ops *ops; |
e712804a | 169 | int need_release; |
1da177e4 | 170 | |
1b1dcc1b | 171 | mutex_lock(&inode->i_mutex); |
9842ef35 TM |
172 | ops = rpci->ops; |
173 | if (ops != NULL) { | |
174 | LIST_HEAD(free_list); | |
9842ef35 | 175 | spin_lock(&inode->i_lock); |
e712804a | 176 | need_release = rpci->nreaders != 0 || rpci->nwriters != 0; |
1da177e4 | 177 | rpci->nreaders = 0; |
9842ef35 TM |
178 | list_splice_init(&rpci->in_upcall, &free_list); |
179 | list_splice_init(&rpci->pipe, &free_list); | |
180 | rpci->pipelen = 0; | |
1da177e4 | 181 | rpci->ops = NULL; |
9842ef35 TM |
182 | spin_unlock(&inode->i_lock); |
183 | rpc_purge_list(rpci, &free_list, ops->destroy_msg, -EPIPE); | |
184 | rpci->nwriters = 0; | |
e712804a | 185 | if (need_release && ops->release_pipe) |
9842ef35 | 186 | ops->release_pipe(inode); |
4011cd97 | 187 | cancel_delayed_work_sync(&rpci->queue_timeout); |
1da177e4 | 188 | } |
6070fe6f | 189 | rpc_inode_setowner(inode, NULL); |
1b1dcc1b | 190 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
191 | } |
192 | ||
1da177e4 LT |
193 | static struct inode * |
194 | rpc_alloc_inode(struct super_block *sb) | |
195 | { | |
196 | struct rpc_inode *rpci; | |
e94b1766 | 197 | rpci = (struct rpc_inode *)kmem_cache_alloc(rpc_inode_cachep, GFP_KERNEL); |
1da177e4 LT |
198 | if (!rpci) |
199 | return NULL; | |
200 | return &rpci->vfs_inode; | |
201 | } | |
202 | ||
203 | static void | |
fa0d7e3d | 204 | rpc_i_callback(struct rcu_head *head) |
1da177e4 | 205 | { |
fa0d7e3d | 206 | struct inode *inode = container_of(head, struct inode, i_rcu); |
1da177e4 LT |
207 | kmem_cache_free(rpc_inode_cachep, RPC_I(inode)); |
208 | } | |
209 | ||
fa0d7e3d NP |
210 | static void |
211 | rpc_destroy_inode(struct inode *inode) | |
212 | { | |
213 | call_rcu(&inode->i_rcu, rpc_i_callback); | |
214 | } | |
215 | ||
1da177e4 LT |
216 | static int |
217 | rpc_pipe_open(struct inode *inode, struct file *filp) | |
218 | { | |
219 | struct rpc_inode *rpci = RPC_I(inode); | |
c3810608 | 220 | int first_open; |
1da177e4 LT |
221 | int res = -ENXIO; |
222 | ||
1b1dcc1b | 223 | mutex_lock(&inode->i_mutex); |
c3810608 BF |
224 | if (rpci->ops == NULL) |
225 | goto out; | |
226 | first_open = rpci->nreaders == 0 && rpci->nwriters == 0; | |
227 | if (first_open && rpci->ops->open_pipe) { | |
228 | res = rpci->ops->open_pipe(inode); | |
229 | if (res) | |
230 | goto out; | |
1da177e4 | 231 | } |
c3810608 BF |
232 | if (filp->f_mode & FMODE_READ) |
233 | rpci->nreaders++; | |
234 | if (filp->f_mode & FMODE_WRITE) | |
235 | rpci->nwriters++; | |
236 | res = 0; | |
237 | out: | |
1b1dcc1b | 238 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
239 | return res; |
240 | } | |
241 | ||
242 | static int | |
243 | rpc_pipe_release(struct inode *inode, struct file *filp) | |
244 | { | |
969b7f25 | 245 | struct rpc_inode *rpci = RPC_I(inode); |
1da177e4 | 246 | struct rpc_pipe_msg *msg; |
e712804a | 247 | int last_close; |
1da177e4 | 248 | |
1b1dcc1b | 249 | mutex_lock(&inode->i_mutex); |
1da177e4 LT |
250 | if (rpci->ops == NULL) |
251 | goto out; | |
655b5bb4 | 252 | msg = filp->private_data; |
1da177e4 | 253 | if (msg != NULL) { |
9842ef35 | 254 | spin_lock(&inode->i_lock); |
48e49187 | 255 | msg->errno = -EAGAIN; |
5a67657a | 256 | list_del_init(&msg->list); |
9842ef35 | 257 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
258 | rpci->ops->destroy_msg(msg); |
259 | } | |
260 | if (filp->f_mode & FMODE_WRITE) | |
261 | rpci->nwriters --; | |
9842ef35 | 262 | if (filp->f_mode & FMODE_READ) { |
1da177e4 | 263 | rpci->nreaders --; |
9842ef35 TM |
264 | if (rpci->nreaders == 0) { |
265 | LIST_HEAD(free_list); | |
266 | spin_lock(&inode->i_lock); | |
267 | list_splice_init(&rpci->pipe, &free_list); | |
268 | rpci->pipelen = 0; | |
269 | spin_unlock(&inode->i_lock); | |
270 | rpc_purge_list(rpci, &free_list, | |
271 | rpci->ops->destroy_msg, -EAGAIN); | |
272 | } | |
273 | } | |
e712804a BF |
274 | last_close = rpci->nwriters == 0 && rpci->nreaders == 0; |
275 | if (last_close && rpci->ops->release_pipe) | |
1da177e4 LT |
276 | rpci->ops->release_pipe(inode); |
277 | out: | |
1b1dcc1b | 278 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
279 | return 0; |
280 | } | |
281 | ||
282 | static ssize_t | |
283 | rpc_pipe_read(struct file *filp, char __user *buf, size_t len, loff_t *offset) | |
284 | { | |
303b46bb | 285 | struct inode *inode = filp->f_path.dentry->d_inode; |
1da177e4 LT |
286 | struct rpc_inode *rpci = RPC_I(inode); |
287 | struct rpc_pipe_msg *msg; | |
288 | int res = 0; | |
289 | ||
1b1dcc1b | 290 | mutex_lock(&inode->i_mutex); |
1da177e4 LT |
291 | if (rpci->ops == NULL) { |
292 | res = -EPIPE; | |
293 | goto out_unlock; | |
294 | } | |
295 | msg = filp->private_data; | |
296 | if (msg == NULL) { | |
9842ef35 | 297 | spin_lock(&inode->i_lock); |
1da177e4 LT |
298 | if (!list_empty(&rpci->pipe)) { |
299 | msg = list_entry(rpci->pipe.next, | |
300 | struct rpc_pipe_msg, | |
301 | list); | |
302 | list_move(&msg->list, &rpci->in_upcall); | |
303 | rpci->pipelen -= msg->len; | |
304 | filp->private_data = msg; | |
305 | msg->copied = 0; | |
306 | } | |
9842ef35 | 307 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
308 | if (msg == NULL) |
309 | goto out_unlock; | |
310 | } | |
311 | /* NOTE: it is up to the callback to update msg->copied */ | |
312 | res = rpci->ops->upcall(filp, msg, buf, len); | |
313 | if (res < 0 || msg->len == msg->copied) { | |
314 | filp->private_data = NULL; | |
9842ef35 | 315 | spin_lock(&inode->i_lock); |
5a67657a | 316 | list_del_init(&msg->list); |
9842ef35 | 317 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
318 | rpci->ops->destroy_msg(msg); |
319 | } | |
320 | out_unlock: | |
1b1dcc1b | 321 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
322 | return res; |
323 | } | |
324 | ||
325 | static ssize_t | |
326 | rpc_pipe_write(struct file *filp, const char __user *buf, size_t len, loff_t *offset) | |
327 | { | |
303b46bb | 328 | struct inode *inode = filp->f_path.dentry->d_inode; |
1da177e4 LT |
329 | struct rpc_inode *rpci = RPC_I(inode); |
330 | int res; | |
331 | ||
1b1dcc1b | 332 | mutex_lock(&inode->i_mutex); |
1da177e4 LT |
333 | res = -EPIPE; |
334 | if (rpci->ops != NULL) | |
335 | res = rpci->ops->downcall(filp, buf, len); | |
1b1dcc1b | 336 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
337 | return res; |
338 | } | |
339 | ||
340 | static unsigned int | |
341 | rpc_pipe_poll(struct file *filp, struct poll_table_struct *wait) | |
342 | { | |
343 | struct rpc_inode *rpci; | |
344 | unsigned int mask = 0; | |
345 | ||
303b46bb | 346 | rpci = RPC_I(filp->f_path.dentry->d_inode); |
1da177e4 LT |
347 | poll_wait(filp, &rpci->waitq, wait); |
348 | ||
349 | mask = POLLOUT | POLLWRNORM; | |
350 | if (rpci->ops == NULL) | |
351 | mask |= POLLERR | POLLHUP; | |
eda4f9b7 | 352 | if (filp->private_data || !list_empty(&rpci->pipe)) |
1da177e4 LT |
353 | mask |= POLLIN | POLLRDNORM; |
354 | return mask; | |
355 | } | |
356 | ||
a6f8dbc6 AB |
357 | static long |
358 | rpc_pipe_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) | |
1da177e4 | 359 | { |
a6f8dbc6 AB |
360 | struct inode *inode = filp->f_path.dentry->d_inode; |
361 | struct rpc_inode *rpci = RPC_I(inode); | |
1da177e4 LT |
362 | int len; |
363 | ||
364 | switch (cmd) { | |
365 | case FIONREAD: | |
a6f8dbc6 AB |
366 | spin_lock(&inode->i_lock); |
367 | if (rpci->ops == NULL) { | |
368 | spin_unlock(&inode->i_lock); | |
1da177e4 | 369 | return -EPIPE; |
a6f8dbc6 | 370 | } |
1da177e4 LT |
371 | len = rpci->pipelen; |
372 | if (filp->private_data) { | |
373 | struct rpc_pipe_msg *msg; | |
655b5bb4 | 374 | msg = filp->private_data; |
1da177e4 LT |
375 | len += msg->len - msg->copied; |
376 | } | |
a6f8dbc6 | 377 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
378 | return put_user(len, (int __user *)arg); |
379 | default: | |
380 | return -EINVAL; | |
381 | } | |
382 | } | |
383 | ||
da7071d7 | 384 | static const struct file_operations rpc_pipe_fops = { |
1da177e4 LT |
385 | .owner = THIS_MODULE, |
386 | .llseek = no_llseek, | |
387 | .read = rpc_pipe_read, | |
388 | .write = rpc_pipe_write, | |
389 | .poll = rpc_pipe_poll, | |
674b604c | 390 | .unlocked_ioctl = rpc_pipe_ioctl, |
1da177e4 LT |
391 | .open = rpc_pipe_open, |
392 | .release = rpc_pipe_release, | |
393 | }; | |
394 | ||
395 | static int | |
396 | rpc_show_info(struct seq_file *m, void *v) | |
397 | { | |
398 | struct rpc_clnt *clnt = m->private; | |
399 | ||
400 | seq_printf(m, "RPC server: %s\n", clnt->cl_server); | |
401 | seq_printf(m, "service: %s (%d) version %d\n", clnt->cl_protname, | |
402 | clnt->cl_prog, clnt->cl_vers); | |
e7f78657 CL |
403 | seq_printf(m, "address: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_ADDR)); |
404 | seq_printf(m, "protocol: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PROTO)); | |
bf19aace | 405 | seq_printf(m, "port: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PORT)); |
1da177e4 LT |
406 | return 0; |
407 | } | |
408 | ||
409 | static int | |
410 | rpc_info_open(struct inode *inode, struct file *file) | |
411 | { | |
006abe88 | 412 | struct rpc_clnt *clnt = NULL; |
1da177e4 LT |
413 | int ret = single_open(file, rpc_show_info, NULL); |
414 | ||
415 | if (!ret) { | |
416 | struct seq_file *m = file->private_data; | |
006abe88 TM |
417 | |
418 | spin_lock(&file->f_path.dentry->d_lock); | |
419 | if (!d_unhashed(file->f_path.dentry)) | |
420 | clnt = RPC_I(inode)->private; | |
421 | if (clnt != NULL && atomic_inc_not_zero(&clnt->cl_count)) { | |
422 | spin_unlock(&file->f_path.dentry->d_lock); | |
1da177e4 LT |
423 | m->private = clnt; |
424 | } else { | |
006abe88 | 425 | spin_unlock(&file->f_path.dentry->d_lock); |
1da177e4 LT |
426 | single_release(inode, file); |
427 | ret = -EINVAL; | |
428 | } | |
1da177e4 LT |
429 | } |
430 | return ret; | |
431 | } | |
432 | ||
433 | static int | |
434 | rpc_info_release(struct inode *inode, struct file *file) | |
435 | { | |
436 | struct seq_file *m = file->private_data; | |
437 | struct rpc_clnt *clnt = (struct rpc_clnt *)m->private; | |
438 | ||
439 | if (clnt) | |
440 | rpc_release_client(clnt); | |
441 | return single_release(inode, file); | |
442 | } | |
443 | ||
da7071d7 | 444 | static const struct file_operations rpc_info_operations = { |
1da177e4 LT |
445 | .owner = THIS_MODULE, |
446 | .open = rpc_info_open, | |
447 | .read = seq_read, | |
448 | .llseek = seq_lseek, | |
449 | .release = rpc_info_release, | |
450 | }; | |
451 | ||
452 | ||
1da177e4 LT |
453 | /* |
454 | * Description of fs contents. | |
455 | */ | |
456 | struct rpc_filelist { | |
ac6fecee | 457 | const char *name; |
99ac48f5 | 458 | const struct file_operations *i_fop; |
7364af6a | 459 | umode_t mode; |
1da177e4 LT |
460 | }; |
461 | ||
54281548 | 462 | struct vfsmount *rpc_get_mount(void) |
1da177e4 | 463 | { |
54281548 TM |
464 | int err; |
465 | ||
fc14f2fe | 466 | err = simple_pin_fs(&rpc_pipe_fs_type, &rpc_mnt, &rpc_mount_count); |
54281548 TM |
467 | if (err != 0) |
468 | return ERR_PTR(err); | |
fc14f2fe | 469 | return rpc_mnt; |
1da177e4 | 470 | } |
e571cbf1 | 471 | EXPORT_SYMBOL_GPL(rpc_get_mount); |
1da177e4 | 472 | |
54281548 | 473 | void rpc_put_mount(void) |
1da177e4 | 474 | { |
fc14f2fe | 475 | simple_release_fs(&rpc_mnt, &rpc_mount_count); |
1da177e4 | 476 | } |
e571cbf1 | 477 | EXPORT_SYMBOL_GPL(rpc_put_mount); |
1da177e4 | 478 | |
fe15ce44 | 479 | static int rpc_delete_dentry(const struct dentry *dentry) |
62e1761c TM |
480 | { |
481 | return 1; | |
482 | } | |
483 | ||
3ba13d17 | 484 | static const struct dentry_operations rpc_dentry_operations = { |
62e1761c TM |
485 | .d_delete = rpc_delete_dentry, |
486 | }; | |
487 | ||
1da177e4 | 488 | static struct inode * |
7364af6a | 489 | rpc_get_inode(struct super_block *sb, umode_t mode) |
1da177e4 LT |
490 | { |
491 | struct inode *inode = new_inode(sb); | |
492 | if (!inode) | |
493 | return NULL; | |
85fe4025 | 494 | inode->i_ino = get_next_ino(); |
1da177e4 | 495 | inode->i_mode = mode; |
1da177e4 | 496 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
89f0e4fe JP |
497 | switch (mode & S_IFMT) { |
498 | case S_IFDIR: | |
499 | inode->i_fop = &simple_dir_operations; | |
500 | inode->i_op = &simple_dir_inode_operations; | |
501 | inc_nlink(inode); | |
502 | default: | |
503 | break; | |
1da177e4 LT |
504 | } |
505 | return inode; | |
506 | } | |
507 | ||
7589806e TM |
508 | static int __rpc_create_common(struct inode *dir, struct dentry *dentry, |
509 | umode_t mode, | |
510 | const struct file_operations *i_fop, | |
511 | void *private) | |
512 | { | |
513 | struct inode *inode; | |
514 | ||
beb0f0a9 | 515 | d_drop(dentry); |
7589806e TM |
516 | inode = rpc_get_inode(dir->i_sb, mode); |
517 | if (!inode) | |
518 | goto out_err; | |
519 | inode->i_ino = iunique(dir->i_sb, 100); | |
520 | if (i_fop) | |
521 | inode->i_fop = i_fop; | |
522 | if (private) | |
523 | rpc_inode_setowner(inode, private); | |
524 | d_add(dentry, inode); | |
525 | return 0; | |
526 | out_err: | |
527 | printk(KERN_WARNING "%s: %s failed to allocate inode for dentry %s\n", | |
528 | __FILE__, __func__, dentry->d_name.name); | |
529 | dput(dentry); | |
530 | return -ENOMEM; | |
531 | } | |
532 | ||
ac6fecee TM |
533 | static int __rpc_create(struct inode *dir, struct dentry *dentry, |
534 | umode_t mode, | |
535 | const struct file_operations *i_fop, | |
536 | void *private) | |
537 | { | |
538 | int err; | |
539 | ||
540 | err = __rpc_create_common(dir, dentry, S_IFREG | mode, i_fop, private); | |
541 | if (err) | |
542 | return err; | |
543 | fsnotify_create(dir, dentry); | |
544 | return 0; | |
545 | } | |
546 | ||
7589806e TM |
547 | static int __rpc_mkdir(struct inode *dir, struct dentry *dentry, |
548 | umode_t mode, | |
549 | const struct file_operations *i_fop, | |
550 | void *private) | |
551 | { | |
552 | int err; | |
553 | ||
554 | err = __rpc_create_common(dir, dentry, S_IFDIR | mode, i_fop, private); | |
555 | if (err) | |
556 | return err; | |
557 | inc_nlink(dir); | |
558 | fsnotify_mkdir(dir, dentry); | |
559 | return 0; | |
560 | } | |
561 | ||
562 | static int __rpc_mkpipe(struct inode *dir, struct dentry *dentry, | |
563 | umode_t mode, | |
564 | const struct file_operations *i_fop, | |
565 | void *private, | |
566 | const struct rpc_pipe_ops *ops, | |
567 | int flags) | |
568 | { | |
569 | struct rpc_inode *rpci; | |
570 | int err; | |
571 | ||
572 | err = __rpc_create_common(dir, dentry, S_IFIFO | mode, i_fop, private); | |
573 | if (err) | |
574 | return err; | |
575 | rpci = RPC_I(dentry->d_inode); | |
7589806e TM |
576 | rpci->private = private; |
577 | rpci->flags = flags; | |
578 | rpci->ops = ops; | |
579 | fsnotify_create(dir, dentry); | |
580 | return 0; | |
581 | } | |
582 | ||
ac6fecee TM |
583 | static int __rpc_rmdir(struct inode *dir, struct dentry *dentry) |
584 | { | |
585 | int ret; | |
586 | ||
587 | dget(dentry); | |
588 | ret = simple_rmdir(dir, dentry); | |
589 | d_delete(dentry); | |
590 | dput(dentry); | |
591 | return ret; | |
592 | } | |
593 | ||
810d90bc TM |
594 | static int __rpc_unlink(struct inode *dir, struct dentry *dentry) |
595 | { | |
596 | int ret; | |
597 | ||
598 | dget(dentry); | |
599 | ret = simple_unlink(dir, dentry); | |
600 | d_delete(dentry); | |
601 | dput(dentry); | |
602 | return ret; | |
603 | } | |
604 | ||
605 | static int __rpc_rmpipe(struct inode *dir, struct dentry *dentry) | |
606 | { | |
607 | struct inode *inode = dentry->d_inode; | |
810d90bc | 608 | |
810d90bc TM |
609 | rpc_close_pipes(inode); |
610 | return __rpc_unlink(dir, dentry); | |
611 | } | |
612 | ||
5bff0386 | 613 | static struct dentry *__rpc_lookup_create_exclusive(struct dentry *parent, |
cfeaa4a3 TM |
614 | struct qstr *name) |
615 | { | |
616 | struct dentry *dentry; | |
617 | ||
618 | dentry = d_lookup(parent, name); | |
619 | if (!dentry) { | |
620 | dentry = d_alloc(parent, name); | |
5bff0386 SK |
621 | if (!dentry) |
622 | return ERR_PTR(-ENOMEM); | |
cfeaa4a3 | 623 | } |
5bff0386 | 624 | if (dentry->d_inode == NULL) { |
fb045adb | 625 | d_set_d_op(dentry, &rpc_dentry_operations); |
cfeaa4a3 | 626 | return dentry; |
5bff0386 | 627 | } |
cfeaa4a3 TM |
628 | dput(dentry); |
629 | return ERR_PTR(-EEXIST); | |
630 | } | |
631 | ||
1da177e4 LT |
632 | /* |
633 | * FIXME: This probably has races. | |
634 | */ | |
ac6fecee TM |
635 | static void __rpc_depopulate(struct dentry *parent, |
636 | const struct rpc_filelist *files, | |
637 | int start, int eof) | |
1da177e4 LT |
638 | { |
639 | struct inode *dir = parent->d_inode; | |
ac6fecee TM |
640 | struct dentry *dentry; |
641 | struct qstr name; | |
642 | int i; | |
1da177e4 | 643 | |
ac6fecee TM |
644 | for (i = start; i < eof; i++) { |
645 | name.name = files[i].name; | |
646 | name.len = strlen(files[i].name); | |
647 | name.hash = full_name_hash(name.name, name.len); | |
648 | dentry = d_lookup(parent, &name); | |
649 | ||
650 | if (dentry == NULL) | |
62e1761c | 651 | continue; |
ac6fecee TM |
652 | if (dentry->d_inode == NULL) |
653 | goto next; | |
654 | switch (dentry->d_inode->i_mode & S_IFMT) { | |
655 | default: | |
656 | BUG(); | |
657 | case S_IFREG: | |
658 | __rpc_unlink(dir, dentry); | |
1da177e4 | 659 | break; |
ac6fecee TM |
660 | case S_IFDIR: |
661 | __rpc_rmdir(dir, dentry); | |
662 | } | |
663 | next: | |
664 | dput(dentry); | |
1da177e4 | 665 | } |
ac6fecee TM |
666 | } |
667 | ||
668 | static void rpc_depopulate(struct dentry *parent, | |
669 | const struct rpc_filelist *files, | |
670 | int start, int eof) | |
671 | { | |
672 | struct inode *dir = parent->d_inode; | |
673 | ||
674 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_CHILD); | |
675 | __rpc_depopulate(parent, files, start, eof); | |
1b1dcc1b | 676 | mutex_unlock(&dir->i_mutex); |
1da177e4 LT |
677 | } |
678 | ||
ac6fecee TM |
679 | static int rpc_populate(struct dentry *parent, |
680 | const struct rpc_filelist *files, | |
681 | int start, int eof, | |
682 | void *private) | |
1da177e4 | 683 | { |
ac6fecee | 684 | struct inode *dir = parent->d_inode; |
1da177e4 | 685 | struct dentry *dentry; |
ac6fecee | 686 | int i, err; |
1da177e4 | 687 | |
1b1dcc1b | 688 | mutex_lock(&dir->i_mutex); |
1da177e4 | 689 | for (i = start; i < eof; i++) { |
ac6fecee TM |
690 | struct qstr q; |
691 | ||
692 | q.name = files[i].name; | |
693 | q.len = strlen(files[i].name); | |
694 | q.hash = full_name_hash(q.name, q.len); | |
695 | dentry = __rpc_lookup_create_exclusive(parent, &q); | |
696 | err = PTR_ERR(dentry); | |
697 | if (IS_ERR(dentry)) | |
1da177e4 | 698 | goto out_bad; |
ac6fecee TM |
699 | switch (files[i].mode & S_IFMT) { |
700 | default: | |
701 | BUG(); | |
702 | case S_IFREG: | |
703 | err = __rpc_create(dir, dentry, | |
704 | files[i].mode, | |
705 | files[i].i_fop, | |
706 | private); | |
707 | break; | |
708 | case S_IFDIR: | |
709 | err = __rpc_mkdir(dir, dentry, | |
710 | files[i].mode, | |
711 | NULL, | |
712 | private); | |
1da177e4 | 713 | } |
ac6fecee TM |
714 | if (err != 0) |
715 | goto out_bad; | |
1da177e4 | 716 | } |
1b1dcc1b | 717 | mutex_unlock(&dir->i_mutex); |
1da177e4 LT |
718 | return 0; |
719 | out_bad: | |
ac6fecee | 720 | __rpc_depopulate(parent, files, start, eof); |
1b1dcc1b | 721 | mutex_unlock(&dir->i_mutex); |
1da177e4 | 722 | printk(KERN_WARNING "%s: %s failed to populate directory %s\n", |
0dc47877 | 723 | __FILE__, __func__, parent->d_name.name); |
ac6fecee | 724 | return err; |
f134585a | 725 | } |
1da177e4 | 726 | |
e57aed77 TM |
727 | static struct dentry *rpc_mkdir_populate(struct dentry *parent, |
728 | struct qstr *name, umode_t mode, void *private, | |
729 | int (*populate)(struct dentry *, void *), void *args_populate) | |
f134585a | 730 | { |
f134585a | 731 | struct dentry *dentry; |
7d59d1e8 | 732 | struct inode *dir = parent->d_inode; |
f134585a TM |
733 | int error; |
734 | ||
7d59d1e8 TM |
735 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); |
736 | dentry = __rpc_lookup_create_exclusive(parent, name); | |
f134585a | 737 | if (IS_ERR(dentry)) |
7d59d1e8 TM |
738 | goto out; |
739 | error = __rpc_mkdir(dir, dentry, mode, NULL, private); | |
7589806e TM |
740 | if (error != 0) |
741 | goto out_err; | |
e57aed77 TM |
742 | if (populate != NULL) { |
743 | error = populate(dentry, args_populate); | |
744 | if (error) | |
745 | goto err_rmdir; | |
746 | } | |
f134585a | 747 | out: |
1b1dcc1b | 748 | mutex_unlock(&dir->i_mutex); |
5c3e985a | 749 | return dentry; |
ac6fecee | 750 | err_rmdir: |
f134585a | 751 | __rpc_rmdir(dir, dentry); |
7589806e | 752 | out_err: |
f134585a TM |
753 | dentry = ERR_PTR(error); |
754 | goto out; | |
1da177e4 LT |
755 | } |
756 | ||
e57aed77 TM |
757 | static int rpc_rmdir_depopulate(struct dentry *dentry, |
758 | void (*depopulate)(struct dentry *)) | |
1da177e4 | 759 | { |
dff02cc1 | 760 | struct dentry *parent; |
f134585a TM |
761 | struct inode *dir; |
762 | int error; | |
278c995c | 763 | |
dff02cc1 TM |
764 | parent = dget_parent(dentry); |
765 | dir = parent->d_inode; | |
c6573c29 | 766 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); |
e57aed77 TM |
767 | if (depopulate != NULL) |
768 | depopulate(dentry); | |
f134585a | 769 | error = __rpc_rmdir(dir, dentry); |
1b1dcc1b | 770 | mutex_unlock(&dir->i_mutex); |
dff02cc1 | 771 | dput(parent); |
f134585a | 772 | return error; |
1da177e4 LT |
773 | } |
774 | ||
93a44a75 BF |
775 | /** |
776 | * rpc_mkpipe - make an rpc_pipefs file for kernel<->userspace communication | |
777 | * @parent: dentry of directory to create new "pipe" in | |
778 | * @name: name of pipe | |
779 | * @private: private data to associate with the pipe, for the caller's use | |
780 | * @ops: operations defining the behavior of the pipe: upcall, downcall, | |
c3810608 | 781 | * release_pipe, open_pipe, and destroy_msg. |
65b6e42c | 782 | * @flags: rpc_inode flags |
93a44a75 BF |
783 | * |
784 | * Data is made available for userspace to read by calls to | |
785 | * rpc_queue_upcall(). The actual reads will result in calls to | |
786 | * @ops->upcall, which will be called with the file pointer, | |
787 | * message, and userspace buffer to copy to. | |
788 | * | |
789 | * Writes can come at any time, and do not necessarily have to be | |
790 | * responses to upcalls. They will result in calls to @msg->downcall. | |
791 | * | |
792 | * The @private argument passed here will be available to all these methods | |
793 | * from the file pointer, via RPC_I(file->f_dentry->d_inode)->private. | |
794 | */ | |
b693ba4a TM |
795 | struct dentry *rpc_mkpipe(struct dentry *parent, const char *name, |
796 | void *private, const struct rpc_pipe_ops *ops, | |
797 | int flags) | |
1da177e4 | 798 | { |
1da177e4 | 799 | struct dentry *dentry; |
7589806e | 800 | struct inode *dir = parent->d_inode; |
7364af6a | 801 | umode_t umode = S_IFIFO | S_IRUSR | S_IWUSR; |
cfeaa4a3 | 802 | struct qstr q; |
7589806e | 803 | int err; |
7364af6a TM |
804 | |
805 | if (ops->upcall == NULL) | |
806 | umode &= ~S_IRUGO; | |
807 | if (ops->downcall == NULL) | |
808 | umode &= ~S_IWUGO; | |
1da177e4 | 809 | |
cfeaa4a3 TM |
810 | q.name = name; |
811 | q.len = strlen(name); | |
812 | q.hash = full_name_hash(q.name, q.len), | |
813 | ||
814 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); | |
5bff0386 | 815 | dentry = __rpc_lookup_create_exclusive(parent, &q); |
1da177e4 | 816 | if (IS_ERR(dentry)) |
cfeaa4a3 | 817 | goto out; |
7589806e | 818 | err = __rpc_mkpipe(dir, dentry, umode, &rpc_pipe_fops, |
810d90bc | 819 | private, ops, flags); |
7589806e TM |
820 | if (err) |
821 | goto out_err; | |
f134585a | 822 | out: |
1b1dcc1b | 823 | mutex_unlock(&dir->i_mutex); |
5c3e985a | 824 | return dentry; |
7589806e TM |
825 | out_err: |
826 | dentry = ERR_PTR(err); | |
158998b6 | 827 | printk(KERN_WARNING "%s: %s() failed to create pipe %s/%s (errno = %d)\n", |
0dc47877 | 828 | __FILE__, __func__, parent->d_name.name, name, |
7589806e | 829 | err); |
f134585a | 830 | goto out; |
1da177e4 | 831 | } |
468039ee | 832 | EXPORT_SYMBOL_GPL(rpc_mkpipe); |
1da177e4 | 833 | |
93a44a75 BF |
834 | /** |
835 | * rpc_unlink - remove a pipe | |
836 | * @dentry: dentry for the pipe, as returned from rpc_mkpipe | |
837 | * | |
838 | * After this call, lookups will no longer find the pipe, and any | |
839 | * attempts to read or write using preexisting opens of the pipe will | |
840 | * return -EPIPE. | |
841 | */ | |
f134585a | 842 | int |
5d67476f | 843 | rpc_unlink(struct dentry *dentry) |
1da177e4 | 844 | { |
5d67476f | 845 | struct dentry *parent; |
f134585a | 846 | struct inode *dir; |
5d67476f | 847 | int error = 0; |
1da177e4 | 848 | |
5d67476f TM |
849 | parent = dget_parent(dentry); |
850 | dir = parent->d_inode; | |
c6573c29 | 851 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); |
810d90bc | 852 | error = __rpc_rmpipe(dir, dentry); |
1b1dcc1b | 853 | mutex_unlock(&dir->i_mutex); |
5d67476f | 854 | dput(parent); |
f134585a | 855 | return error; |
1da177e4 | 856 | } |
468039ee | 857 | EXPORT_SYMBOL_GPL(rpc_unlink); |
1da177e4 | 858 | |
e57aed77 TM |
859 | enum { |
860 | RPCAUTH_info, | |
861 | RPCAUTH_EOF | |
862 | }; | |
863 | ||
864 | static const struct rpc_filelist authfiles[] = { | |
865 | [RPCAUTH_info] = { | |
866 | .name = "info", | |
867 | .i_fop = &rpc_info_operations, | |
868 | .mode = S_IFREG | S_IRUSR, | |
869 | }, | |
870 | }; | |
871 | ||
872 | static int rpc_clntdir_populate(struct dentry *dentry, void *private) | |
873 | { | |
874 | return rpc_populate(dentry, | |
875 | authfiles, RPCAUTH_info, RPCAUTH_EOF, | |
876 | private); | |
877 | } | |
878 | ||
879 | static void rpc_clntdir_depopulate(struct dentry *dentry) | |
880 | { | |
881 | rpc_depopulate(dentry, authfiles, RPCAUTH_info, RPCAUTH_EOF); | |
882 | } | |
883 | ||
7d59d1e8 TM |
884 | /** |
885 | * rpc_create_client_dir - Create a new rpc_client directory in rpc_pipefs | |
4111d4fd RD |
886 | * @dentry: dentry from the rpc_pipefs root to the new directory |
887 | * @name: &struct qstr for the name | |
7d59d1e8 TM |
888 | * @rpc_client: rpc client to associate with this directory |
889 | * | |
890 | * This creates a directory at the given @path associated with | |
891 | * @rpc_clnt, which will contain a file named "info" with some basic | |
892 | * information about the client, together with any "pipes" that may | |
893 | * later be created using rpc_mkpipe(). | |
894 | */ | |
23ac6581 | 895 | struct dentry *rpc_create_client_dir(struct dentry *dentry, |
e57aed77 TM |
896 | struct qstr *name, |
897 | struct rpc_clnt *rpc_client) | |
898 | { | |
899 | return rpc_mkdir_populate(dentry, name, S_IRUGO | S_IXUGO, NULL, | |
900 | rpc_clntdir_populate, rpc_client); | |
901 | } | |
902 | ||
903 | /** | |
904 | * rpc_remove_client_dir - Remove a directory created with rpc_create_client_dir() | |
905 | * @dentry: directory to remove | |
906 | */ | |
907 | int rpc_remove_client_dir(struct dentry *dentry) | |
7d59d1e8 | 908 | { |
e57aed77 | 909 | return rpc_rmdir_depopulate(dentry, rpc_clntdir_depopulate); |
7d59d1e8 TM |
910 | } |
911 | ||
8854e82d TM |
912 | static const struct rpc_filelist cache_pipefs_files[3] = { |
913 | [0] = { | |
914 | .name = "channel", | |
915 | .i_fop = &cache_file_operations_pipefs, | |
96c61cbd | 916 | .mode = S_IFREG|S_IRUSR|S_IWUSR, |
8854e82d TM |
917 | }, |
918 | [1] = { | |
919 | .name = "content", | |
920 | .i_fop = &content_file_operations_pipefs, | |
921 | .mode = S_IFREG|S_IRUSR, | |
922 | }, | |
923 | [2] = { | |
924 | .name = "flush", | |
925 | .i_fop = &cache_flush_operations_pipefs, | |
926 | .mode = S_IFREG|S_IRUSR|S_IWUSR, | |
927 | }, | |
928 | }; | |
929 | ||
930 | static int rpc_cachedir_populate(struct dentry *dentry, void *private) | |
931 | { | |
932 | return rpc_populate(dentry, | |
933 | cache_pipefs_files, 0, 3, | |
934 | private); | |
935 | } | |
936 | ||
937 | static void rpc_cachedir_depopulate(struct dentry *dentry) | |
938 | { | |
939 | rpc_depopulate(dentry, cache_pipefs_files, 0, 3); | |
940 | } | |
941 | ||
942 | struct dentry *rpc_create_cache_dir(struct dentry *parent, struct qstr *name, | |
64f1426f | 943 | umode_t umode, struct cache_detail *cd) |
8854e82d TM |
944 | { |
945 | return rpc_mkdir_populate(parent, name, umode, NULL, | |
946 | rpc_cachedir_populate, cd); | |
947 | } | |
948 | ||
949 | void rpc_remove_cache_dir(struct dentry *dentry) | |
950 | { | |
951 | rpc_rmdir_depopulate(dentry, rpc_cachedir_depopulate); | |
952 | } | |
953 | ||
1da177e4 LT |
954 | /* |
955 | * populate the filesystem | |
956 | */ | |
b87221de | 957 | static const struct super_operations s_ops = { |
1da177e4 LT |
958 | .alloc_inode = rpc_alloc_inode, |
959 | .destroy_inode = rpc_destroy_inode, | |
960 | .statfs = simple_statfs, | |
961 | }; | |
962 | ||
963 | #define RPCAUTH_GSSMAGIC 0x67596969 | |
964 | ||
bb156749 TM |
965 | /* |
966 | * We have a single directory with 1 node in it. | |
967 | */ | |
968 | enum { | |
969 | RPCAUTH_lockd, | |
970 | RPCAUTH_mount, | |
971 | RPCAUTH_nfs, | |
972 | RPCAUTH_portmap, | |
973 | RPCAUTH_statd, | |
974 | RPCAUTH_nfsd4_cb, | |
e571cbf1 | 975 | RPCAUTH_cache, |
bb156749 TM |
976 | RPCAUTH_RootEOF |
977 | }; | |
978 | ||
979 | static const struct rpc_filelist files[] = { | |
980 | [RPCAUTH_lockd] = { | |
981 | .name = "lockd", | |
982 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
983 | }, | |
984 | [RPCAUTH_mount] = { | |
985 | .name = "mount", | |
986 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
987 | }, | |
988 | [RPCAUTH_nfs] = { | |
989 | .name = "nfs", | |
990 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
991 | }, | |
992 | [RPCAUTH_portmap] = { | |
993 | .name = "portmap", | |
994 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
995 | }, | |
996 | [RPCAUTH_statd] = { | |
997 | .name = "statd", | |
998 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
999 | }, | |
1000 | [RPCAUTH_nfsd4_cb] = { | |
1001 | .name = "nfsd4_cb", | |
1002 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
1003 | }, | |
e571cbf1 TM |
1004 | [RPCAUTH_cache] = { |
1005 | .name = "cache", | |
1006 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
1007 | }, | |
bb156749 TM |
1008 | }; |
1009 | ||
432eb1a5 SK |
1010 | /* |
1011 | * This call can be used only in RPC pipefs mount notification hooks. | |
1012 | */ | |
1013 | struct dentry *rpc_d_lookup_sb(const struct super_block *sb, | |
1014 | const unsigned char *dir_name) | |
1015 | { | |
1016 | struct qstr dir = { | |
1017 | .name = dir_name, | |
1018 | .len = strlen(dir_name), | |
1019 | .hash = full_name_hash(dir_name, strlen(dir_name)), | |
1020 | }; | |
1021 | ||
1022 | return d_lookup(sb->s_root, &dir); | |
1023 | } | |
1024 | EXPORT_SYMBOL_GPL(rpc_d_lookup_sb); | |
1025 | ||
1da177e4 LT |
1026 | static int |
1027 | rpc_fill_super(struct super_block *sb, void *data, int silent) | |
1028 | { | |
1029 | struct inode *inode; | |
1030 | struct dentry *root; | |
38b0da75 | 1031 | struct net *net = data; |
90c4e829 | 1032 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
2d00131a | 1033 | int err; |
1da177e4 LT |
1034 | |
1035 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
1036 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
1037 | sb->s_magic = RPCAUTH_GSSMAGIC; | |
1038 | sb->s_op = &s_ops; | |
1039 | sb->s_time_gran = 1; | |
1040 | ||
1041 | inode = rpc_get_inode(sb, S_IFDIR | 0755); | |
1042 | if (!inode) | |
1043 | return -ENOMEM; | |
fc7bed8c | 1044 | sb->s_root = root = d_alloc_root(inode); |
1da177e4 LT |
1045 | if (!root) { |
1046 | iput(inode); | |
1047 | return -ENOMEM; | |
1048 | } | |
ac6fecee | 1049 | if (rpc_populate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF, NULL)) |
fc7bed8c | 1050 | return -ENOMEM; |
2d00131a SK |
1051 | err = blocking_notifier_call_chain(&rpc_pipefs_notifier_list, |
1052 | RPC_PIPEFS_MOUNT, | |
1053 | sb); | |
1054 | if (err) | |
1055 | goto err_depopulate; | |
021c68de | 1056 | sb->s_fs_info = get_net(net); |
90c4e829 | 1057 | sn->pipefs_sb = sb; |
1da177e4 | 1058 | return 0; |
2d00131a SK |
1059 | |
1060 | err_depopulate: | |
1061 | blocking_notifier_call_chain(&rpc_pipefs_notifier_list, | |
1062 | RPC_PIPEFS_UMOUNT, | |
1063 | sb); | |
1064 | __rpc_depopulate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF); | |
1065 | return err; | |
1da177e4 LT |
1066 | } |
1067 | ||
fc14f2fe AV |
1068 | static struct dentry * |
1069 | rpc_mount(struct file_system_type *fs_type, | |
1070 | int flags, const char *dev_name, void *data) | |
1da177e4 | 1071 | { |
38b0da75 | 1072 | return mount_ns(fs_type, flags, current->nsproxy->net_ns, rpc_fill_super); |
1da177e4 LT |
1073 | } |
1074 | ||
021c68de SK |
1075 | void rpc_kill_sb(struct super_block *sb) |
1076 | { | |
1077 | struct net *net = sb->s_fs_info; | |
90c4e829 | 1078 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
021c68de | 1079 | |
90c4e829 | 1080 | sn->pipefs_sb = NULL; |
021c68de | 1081 | put_net(net); |
2d00131a SK |
1082 | blocking_notifier_call_chain(&rpc_pipefs_notifier_list, |
1083 | RPC_PIPEFS_UMOUNT, | |
1084 | sb); | |
021c68de SK |
1085 | kill_litter_super(sb); |
1086 | } | |
1087 | ||
1da177e4 LT |
1088 | static struct file_system_type rpc_pipe_fs_type = { |
1089 | .owner = THIS_MODULE, | |
1090 | .name = "rpc_pipefs", | |
fc14f2fe | 1091 | .mount = rpc_mount, |
021c68de | 1092 | .kill_sb = rpc_kill_sb, |
1da177e4 LT |
1093 | }; |
1094 | ||
1095 | static void | |
51cc5068 | 1096 | init_once(void *foo) |
1da177e4 LT |
1097 | { |
1098 | struct rpc_inode *rpci = (struct rpc_inode *) foo; | |
1099 | ||
a35afb83 CL |
1100 | inode_init_once(&rpci->vfs_inode); |
1101 | rpci->private = NULL; | |
1102 | rpci->nreaders = 0; | |
1103 | rpci->nwriters = 0; | |
1104 | INIT_LIST_HEAD(&rpci->in_upcall); | |
6e84c7b6 | 1105 | INIT_LIST_HEAD(&rpci->in_downcall); |
a35afb83 CL |
1106 | INIT_LIST_HEAD(&rpci->pipe); |
1107 | rpci->pipelen = 0; | |
1108 | init_waitqueue_head(&rpci->waitq); | |
1109 | INIT_DELAYED_WORK(&rpci->queue_timeout, | |
1110 | rpc_timeout_upcall_queue); | |
1111 | rpci->ops = NULL; | |
1da177e4 LT |
1112 | } |
1113 | ||
1114 | int register_rpc_pipefs(void) | |
1115 | { | |
5bd5f581 AM |
1116 | int err; |
1117 | ||
1da177e4 | 1118 | rpc_inode_cachep = kmem_cache_create("rpc_inode_cache", |
fffb60f9 PJ |
1119 | sizeof(struct rpc_inode), |
1120 | 0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| | |
1121 | SLAB_MEM_SPREAD), | |
20c2df83 | 1122 | init_once); |
1da177e4 LT |
1123 | if (!rpc_inode_cachep) |
1124 | return -ENOMEM; | |
5bd5f581 AM |
1125 | err = register_filesystem(&rpc_pipe_fs_type); |
1126 | if (err) { | |
1127 | kmem_cache_destroy(rpc_inode_cachep); | |
1128 | return err; | |
1129 | } | |
1130 | ||
1da177e4 LT |
1131 | return 0; |
1132 | } | |
1133 | ||
1134 | void unregister_rpc_pipefs(void) | |
1135 | { | |
1a1d92c1 | 1136 | kmem_cache_destroy(rpc_inode_cachep); |
1da177e4 LT |
1137 | unregister_filesystem(&rpc_pipe_fs_type); |
1138 | } | |
dcbf8c30 MS |
1139 | |
1140 | /* Make 'mount -t rpc_pipefs ...' autoload this module. */ | |
1141 | MODULE_ALIAS("rpc_pipefs"); |