Commit | Line | Data |
---|---|---|
457c8996 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * net/sunrpc/rpc_pipe.c | |
4 | * | |
5 | * Userland/kernel interface for rpcauth_gss. | |
6 | * Code shamelessly plagiarized from fs/nfsd/nfsctl.c | |
d51fe1be | 7 | * and fs/sysfs/inode.c |
1da177e4 LT |
8 | * |
9 | * Copyright (c) 2002, Trond Myklebust <trond.myklebust@fys.uio.no> | |
10 | * | |
11 | */ | |
1da177e4 LT |
12 | #include <linux/module.h> |
13 | #include <linux/slab.h> | |
14 | #include <linux/string.h> | |
15 | #include <linux/pagemap.h> | |
16 | #include <linux/mount.h> | |
b9662f31 | 17 | #include <linux/fs_context.h> |
1da177e4 | 18 | #include <linux/namei.h> |
50e437d5 | 19 | #include <linux/fsnotify.h> |
1da177e4 | 20 | #include <linux/kernel.h> |
2446ab60 | 21 | #include <linux/rcupdate.h> |
e2f0c83a | 22 | #include <linux/utsname.h> |
1da177e4 LT |
23 | |
24 | #include <asm/ioctls.h> | |
1da177e4 LT |
25 | #include <linux/poll.h> |
26 | #include <linux/wait.h> | |
27 | #include <linux/seq_file.h> | |
28 | ||
29 | #include <linux/sunrpc/clnt.h> | |
30 | #include <linux/workqueue.h> | |
31 | #include <linux/sunrpc/rpc_pipe_fs.h> | |
8854e82d | 32 | #include <linux/sunrpc/cache.h> |
021c68de | 33 | #include <linux/nsproxy.h> |
2d00131a | 34 | #include <linux/notifier.h> |
1da177e4 | 35 | |
021c68de | 36 | #include "netns.h" |
2d00131a | 37 | #include "sunrpc.h" |
1da177e4 | 38 | |
efc46bf2 SK |
39 | #define RPCDBG_FACILITY RPCDBG_DEBUG |
40 | ||
41 | #define NET_NAME(net) ((net == &init_net) ? " (init_net)" : "") | |
1da177e4 LT |
42 | |
43 | static struct file_system_type rpc_pipe_fs_type; | |
4b9a445e | 44 | static const struct rpc_pipe_ops gssd_dummy_pipe_ops; |
1da177e4 | 45 | |
e18b890b | 46 | static struct kmem_cache *rpc_inode_cachep __read_mostly; |
1da177e4 LT |
47 | |
48 | #define RPC_UPCALL_TIMEOUT (30*HZ) | |
49 | ||
2d00131a SK |
50 | static BLOCKING_NOTIFIER_HEAD(rpc_pipefs_notifier_list); |
51 | ||
52 | int rpc_pipefs_notifier_register(struct notifier_block *nb) | |
53 | { | |
260a2679 | 54 | return blocking_notifier_chain_register(&rpc_pipefs_notifier_list, nb); |
2d00131a SK |
55 | } |
56 | EXPORT_SYMBOL_GPL(rpc_pipefs_notifier_register); | |
57 | ||
58 | void rpc_pipefs_notifier_unregister(struct notifier_block *nb) | |
59 | { | |
60 | blocking_notifier_chain_unregister(&rpc_pipefs_notifier_list, nb); | |
61 | } | |
62 | EXPORT_SYMBOL_GPL(rpc_pipefs_notifier_unregister); | |
63 | ||
591ad7fe | 64 | static void rpc_purge_list(wait_queue_head_t *waitq, struct list_head *head, |
9842ef35 | 65 | void (*destroy_msg)(struct rpc_pipe_msg *), int err) |
1da177e4 | 66 | { |
1da177e4 LT |
67 | struct rpc_pipe_msg *msg; |
68 | ||
9842ef35 TM |
69 | if (list_empty(head)) |
70 | return; | |
71 | do { | |
b3eb67a2 | 72 | msg = list_entry(head->next, struct rpc_pipe_msg, list); |
5a67657a | 73 | list_del_init(&msg->list); |
1da177e4 | 74 | msg->errno = err; |
b3eb67a2 | 75 | destroy_msg(msg); |
9842ef35 | 76 | } while (!list_empty(head)); |
92123e06 JL |
77 | |
78 | if (waitq) | |
79 | wake_up(waitq); | |
1da177e4 LT |
80 | } |
81 | ||
82 | static void | |
65f27f38 | 83 | rpc_timeout_upcall_queue(struct work_struct *work) |
1da177e4 | 84 | { |
9842ef35 | 85 | LIST_HEAD(free_list); |
ba9e0975 SK |
86 | struct rpc_pipe *pipe = |
87 | container_of(work, struct rpc_pipe, queue_timeout.work); | |
9842ef35 | 88 | void (*destroy_msg)(struct rpc_pipe_msg *); |
591ad7fe | 89 | struct dentry *dentry; |
1da177e4 | 90 | |
ba9e0975 | 91 | spin_lock(&pipe->lock); |
ba9e0975 SK |
92 | destroy_msg = pipe->ops->destroy_msg; |
93 | if (pipe->nreaders == 0) { | |
94 | list_splice_init(&pipe->pipe, &free_list); | |
95 | pipe->pipelen = 0; | |
9842ef35 | 96 | } |
591ad7fe | 97 | dentry = dget(pipe->dentry); |
ba9e0975 | 98 | spin_unlock(&pipe->lock); |
c5ef6035 | 99 | rpc_purge_list(dentry ? &RPC_I(d_inode(dentry))->waitq : NULL, |
92123e06 JL |
100 | &free_list, destroy_msg, -ETIMEDOUT); |
101 | dput(dentry); | |
1da177e4 LT |
102 | } |
103 | ||
c1225158 PT |
104 | ssize_t rpc_pipe_generic_upcall(struct file *filp, struct rpc_pipe_msg *msg, |
105 | char __user *dst, size_t buflen) | |
106 | { | |
107 | char *data = (char *)msg->data + msg->copied; | |
108 | size_t mlen = min(msg->len - msg->copied, buflen); | |
109 | unsigned long left; | |
110 | ||
111 | left = copy_to_user(dst, data, mlen); | |
112 | if (left == mlen) { | |
113 | msg->errno = -EFAULT; | |
114 | return -EFAULT; | |
115 | } | |
116 | ||
117 | mlen -= left; | |
118 | msg->copied += mlen; | |
119 | msg->errno = 0; | |
120 | return mlen; | |
121 | } | |
122 | EXPORT_SYMBOL_GPL(rpc_pipe_generic_upcall); | |
123 | ||
93a44a75 | 124 | /** |
1a5778aa | 125 | * rpc_queue_upcall - queue an upcall message to userspace |
bda14606 | 126 | * @pipe: upcall pipe on which to queue given message |
93a44a75 BF |
127 | * @msg: message to queue |
128 | * | |
129 | * Call with an @inode created by rpc_mkpipe() to queue an upcall. | |
130 | * A userspace process may then later read the upcall by performing a | |
131 | * read on an open file for this inode. It is up to the caller to | |
132 | * initialize the fields of @msg (other than @msg->list) appropriately. | |
133 | */ | |
1da177e4 | 134 | int |
d706ed1f | 135 | rpc_queue_upcall(struct rpc_pipe *pipe, struct rpc_pipe_msg *msg) |
1da177e4 | 136 | { |
6070fe6f | 137 | int res = -EPIPE; |
591ad7fe | 138 | struct dentry *dentry; |
1da177e4 | 139 | |
d0fe13ba | 140 | spin_lock(&pipe->lock); |
d0fe13ba SK |
141 | if (pipe->nreaders) { |
142 | list_add_tail(&msg->list, &pipe->pipe); | |
143 | pipe->pipelen += msg->len; | |
6070fe6f | 144 | res = 0; |
d0fe13ba SK |
145 | } else if (pipe->flags & RPC_PIPE_WAIT_FOR_OPEN) { |
146 | if (list_empty(&pipe->pipe)) | |
24c5d9d7 | 147 | queue_delayed_work(rpciod_workqueue, |
d0fe13ba | 148 | &pipe->queue_timeout, |
1da177e4 | 149 | RPC_UPCALL_TIMEOUT); |
d0fe13ba SK |
150 | list_add_tail(&msg->list, &pipe->pipe); |
151 | pipe->pipelen += msg->len; | |
6070fe6f TM |
152 | res = 0; |
153 | } | |
591ad7fe | 154 | dentry = dget(pipe->dentry); |
d0fe13ba | 155 | spin_unlock(&pipe->lock); |
591ad7fe | 156 | if (dentry) { |
c5ef6035 | 157 | wake_up(&RPC_I(d_inode(dentry))->waitq); |
591ad7fe SK |
158 | dput(dentry); |
159 | } | |
1da177e4 LT |
160 | return res; |
161 | } | |
468039ee | 162 | EXPORT_SYMBOL_GPL(rpc_queue_upcall); |
1da177e4 | 163 | |
6070fe6f TM |
164 | static inline void |
165 | rpc_inode_setowner(struct inode *inode, void *private) | |
166 | { | |
167 | RPC_I(inode)->private = private; | |
168 | } | |
169 | ||
1da177e4 LT |
170 | static void |
171 | rpc_close_pipes(struct inode *inode) | |
172 | { | |
ba9e0975 | 173 | struct rpc_pipe *pipe = RPC_I(inode)->pipe; |
e712804a | 174 | int need_release; |
ad6b1340 | 175 | LIST_HEAD(free_list); |
1da177e4 | 176 | |
5955102c | 177 | inode_lock(inode); |
ad6b1340 SK |
178 | spin_lock(&pipe->lock); |
179 | need_release = pipe->nreaders != 0 || pipe->nwriters != 0; | |
180 | pipe->nreaders = 0; | |
181 | list_splice_init(&pipe->in_upcall, &free_list); | |
182 | list_splice_init(&pipe->pipe, &free_list); | |
183 | pipe->pipelen = 0; | |
184 | pipe->dentry = NULL; | |
185 | spin_unlock(&pipe->lock); | |
591ad7fe | 186 | rpc_purge_list(&RPC_I(inode)->waitq, &free_list, pipe->ops->destroy_msg, -EPIPE); |
ad6b1340 SK |
187 | pipe->nwriters = 0; |
188 | if (need_release && pipe->ops->release_pipe) | |
189 | pipe->ops->release_pipe(inode); | |
190 | cancel_delayed_work_sync(&pipe->queue_timeout); | |
6070fe6f | 191 | rpc_inode_setowner(inode, NULL); |
2c9030ee | 192 | RPC_I(inode)->pipe = NULL; |
5955102c | 193 | inode_unlock(inode); |
1da177e4 LT |
194 | } |
195 | ||
1da177e4 LT |
196 | static struct inode * |
197 | rpc_alloc_inode(struct super_block *sb) | |
198 | { | |
199 | struct rpc_inode *rpci; | |
fd60b288 | 200 | rpci = alloc_inode_sb(sb, rpc_inode_cachep, GFP_KERNEL); |
1da177e4 LT |
201 | if (!rpci) |
202 | return NULL; | |
203 | return &rpci->vfs_inode; | |
204 | } | |
205 | ||
206 | static void | |
bef252fa | 207 | rpc_free_inode(struct inode *inode) |
1da177e4 LT |
208 | { |
209 | kmem_cache_free(rpc_inode_cachep, RPC_I(inode)); | |
210 | } | |
211 | ||
212 | static int | |
213 | rpc_pipe_open(struct inode *inode, struct file *filp) | |
214 | { | |
2c9030ee | 215 | struct rpc_pipe *pipe; |
c3810608 | 216 | int first_open; |
1da177e4 LT |
217 | int res = -ENXIO; |
218 | ||
5955102c | 219 | inode_lock(inode); |
2c9030ee SK |
220 | pipe = RPC_I(inode)->pipe; |
221 | if (pipe == NULL) | |
c3810608 | 222 | goto out; |
d0fe13ba SK |
223 | first_open = pipe->nreaders == 0 && pipe->nwriters == 0; |
224 | if (first_open && pipe->ops->open_pipe) { | |
225 | res = pipe->ops->open_pipe(inode); | |
c3810608 BF |
226 | if (res) |
227 | goto out; | |
1da177e4 | 228 | } |
c3810608 | 229 | if (filp->f_mode & FMODE_READ) |
d0fe13ba | 230 | pipe->nreaders++; |
c3810608 | 231 | if (filp->f_mode & FMODE_WRITE) |
d0fe13ba | 232 | pipe->nwriters++; |
c3810608 BF |
233 | res = 0; |
234 | out: | |
5955102c | 235 | inode_unlock(inode); |
1da177e4 LT |
236 | return res; |
237 | } | |
238 | ||
239 | static int | |
240 | rpc_pipe_release(struct inode *inode, struct file *filp) | |
241 | { | |
2c9030ee | 242 | struct rpc_pipe *pipe; |
1da177e4 | 243 | struct rpc_pipe_msg *msg; |
e712804a | 244 | int last_close; |
1da177e4 | 245 | |
5955102c | 246 | inode_lock(inode); |
2c9030ee SK |
247 | pipe = RPC_I(inode)->pipe; |
248 | if (pipe == NULL) | |
1da177e4 | 249 | goto out; |
655b5bb4 | 250 | msg = filp->private_data; |
1da177e4 | 251 | if (msg != NULL) { |
ba9e0975 | 252 | spin_lock(&pipe->lock); |
48e49187 | 253 | msg->errno = -EAGAIN; |
5a67657a | 254 | list_del_init(&msg->list); |
ba9e0975 SK |
255 | spin_unlock(&pipe->lock); |
256 | pipe->ops->destroy_msg(msg); | |
1da177e4 LT |
257 | } |
258 | if (filp->f_mode & FMODE_WRITE) | |
ba9e0975 | 259 | pipe->nwriters --; |
9842ef35 | 260 | if (filp->f_mode & FMODE_READ) { |
ba9e0975 SK |
261 | pipe->nreaders --; |
262 | if (pipe->nreaders == 0) { | |
9842ef35 | 263 | LIST_HEAD(free_list); |
ba9e0975 SK |
264 | spin_lock(&pipe->lock); |
265 | list_splice_init(&pipe->pipe, &free_list); | |
266 | pipe->pipelen = 0; | |
267 | spin_unlock(&pipe->lock); | |
591ad7fe | 268 | rpc_purge_list(&RPC_I(inode)->waitq, &free_list, |
ba9e0975 | 269 | pipe->ops->destroy_msg, -EAGAIN); |
9842ef35 TM |
270 | } |
271 | } | |
ba9e0975 SK |
272 | last_close = pipe->nwriters == 0 && pipe->nreaders == 0; |
273 | if (last_close && pipe->ops->release_pipe) | |
274 | pipe->ops->release_pipe(inode); | |
1da177e4 | 275 | out: |
5955102c | 276 | inode_unlock(inode); |
1da177e4 LT |
277 | return 0; |
278 | } | |
279 | ||
280 | static ssize_t | |
281 | rpc_pipe_read(struct file *filp, char __user *buf, size_t len, loff_t *offset) | |
282 | { | |
496ad9aa | 283 | struct inode *inode = file_inode(filp); |
2c9030ee | 284 | struct rpc_pipe *pipe; |
1da177e4 LT |
285 | struct rpc_pipe_msg *msg; |
286 | int res = 0; | |
287 | ||
5955102c | 288 | inode_lock(inode); |
2c9030ee SK |
289 | pipe = RPC_I(inode)->pipe; |
290 | if (pipe == NULL) { | |
1da177e4 LT |
291 | res = -EPIPE; |
292 | goto out_unlock; | |
293 | } | |
294 | msg = filp->private_data; | |
295 | if (msg == NULL) { | |
d0fe13ba SK |
296 | spin_lock(&pipe->lock); |
297 | if (!list_empty(&pipe->pipe)) { | |
298 | msg = list_entry(pipe->pipe.next, | |
1da177e4 LT |
299 | struct rpc_pipe_msg, |
300 | list); | |
d0fe13ba SK |
301 | list_move(&msg->list, &pipe->in_upcall); |
302 | pipe->pipelen -= msg->len; | |
1da177e4 LT |
303 | filp->private_data = msg; |
304 | msg->copied = 0; | |
305 | } | |
d0fe13ba | 306 | spin_unlock(&pipe->lock); |
1da177e4 LT |
307 | if (msg == NULL) |
308 | goto out_unlock; | |
309 | } | |
310 | /* NOTE: it is up to the callback to update msg->copied */ | |
d0fe13ba | 311 | res = pipe->ops->upcall(filp, msg, buf, len); |
1da177e4 LT |
312 | if (res < 0 || msg->len == msg->copied) { |
313 | filp->private_data = NULL; | |
d0fe13ba | 314 | spin_lock(&pipe->lock); |
5a67657a | 315 | list_del_init(&msg->list); |
d0fe13ba SK |
316 | spin_unlock(&pipe->lock); |
317 | pipe->ops->destroy_msg(msg); | |
1da177e4 LT |
318 | } |
319 | out_unlock: | |
5955102c | 320 | inode_unlock(inode); |
1da177e4 LT |
321 | return res; |
322 | } | |
323 | ||
324 | static ssize_t | |
325 | rpc_pipe_write(struct file *filp, const char __user *buf, size_t len, loff_t *offset) | |
326 | { | |
496ad9aa | 327 | struct inode *inode = file_inode(filp); |
1da177e4 LT |
328 | int res; |
329 | ||
5955102c | 330 | inode_lock(inode); |
1da177e4 | 331 | res = -EPIPE; |
2c9030ee SK |
332 | if (RPC_I(inode)->pipe != NULL) |
333 | res = RPC_I(inode)->pipe->ops->downcall(filp, buf, len); | |
5955102c | 334 | inode_unlock(inode); |
1da177e4 LT |
335 | return res; |
336 | } | |
337 | ||
ade994f4 | 338 | static __poll_t |
1da177e4 LT |
339 | rpc_pipe_poll(struct file *filp, struct poll_table_struct *wait) |
340 | { | |
496ad9aa | 341 | struct inode *inode = file_inode(filp); |
591ad7fe | 342 | struct rpc_inode *rpci = RPC_I(inode); |
a9a08845 | 343 | __poll_t mask = EPOLLOUT | EPOLLWRNORM; |
1da177e4 | 344 | |
1da177e4 LT |
345 | poll_wait(filp, &rpci->waitq, wait); |
346 | ||
5955102c | 347 | inode_lock(inode); |
591ad7fe | 348 | if (rpci->pipe == NULL) |
a9a08845 | 349 | mask |= EPOLLERR | EPOLLHUP; |
591ad7fe | 350 | else if (filp->private_data || !list_empty(&rpci->pipe->pipe)) |
a9a08845 | 351 | mask |= EPOLLIN | EPOLLRDNORM; |
5955102c | 352 | inode_unlock(inode); |
1da177e4 LT |
353 | return mask; |
354 | } | |
355 | ||
a6f8dbc6 AB |
356 | static long |
357 | rpc_pipe_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) | |
1da177e4 | 358 | { |
496ad9aa | 359 | struct inode *inode = file_inode(filp); |
2c9030ee | 360 | struct rpc_pipe *pipe; |
1da177e4 LT |
361 | int len; |
362 | ||
363 | switch (cmd) { | |
364 | case FIONREAD: | |
5955102c | 365 | inode_lock(inode); |
2c9030ee SK |
366 | pipe = RPC_I(inode)->pipe; |
367 | if (pipe == NULL) { | |
5955102c | 368 | inode_unlock(inode); |
1da177e4 | 369 | return -EPIPE; |
a6f8dbc6 | 370 | } |
2c9030ee | 371 | spin_lock(&pipe->lock); |
d0fe13ba | 372 | len = pipe->pipelen; |
1da177e4 LT |
373 | if (filp->private_data) { |
374 | struct rpc_pipe_msg *msg; | |
655b5bb4 | 375 | msg = filp->private_data; |
1da177e4 LT |
376 | len += msg->len - msg->copied; |
377 | } | |
d0fe13ba | 378 | spin_unlock(&pipe->lock); |
5955102c | 379 | inode_unlock(inode); |
1da177e4 LT |
380 | return put_user(len, (int __user *)arg); |
381 | default: | |
382 | return -EINVAL; | |
383 | } | |
384 | } | |
385 | ||
da7071d7 | 386 | static const struct file_operations rpc_pipe_fops = { |
1da177e4 LT |
387 | .owner = THIS_MODULE, |
388 | .llseek = no_llseek, | |
389 | .read = rpc_pipe_read, | |
390 | .write = rpc_pipe_write, | |
391 | .poll = rpc_pipe_poll, | |
674b604c | 392 | .unlocked_ioctl = rpc_pipe_ioctl, |
1da177e4 LT |
393 | .open = rpc_pipe_open, |
394 | .release = rpc_pipe_release, | |
395 | }; | |
396 | ||
397 | static int | |
398 | rpc_show_info(struct seq_file *m, void *v) | |
399 | { | |
400 | struct rpc_clnt *clnt = m->private; | |
401 | ||
2446ab60 | 402 | rcu_read_lock(); |
4e0038b6 TM |
403 | seq_printf(m, "RPC server: %s\n", |
404 | rcu_dereference(clnt->cl_xprt)->servername); | |
55909f21 | 405 | seq_printf(m, "service: %s (%d) version %d\n", clnt->cl_program->name, |
1da177e4 | 406 | clnt->cl_prog, clnt->cl_vers); |
e7f78657 CL |
407 | seq_printf(m, "address: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_ADDR)); |
408 | seq_printf(m, "protocol: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PROTO)); | |
bf19aace | 409 | seq_printf(m, "port: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PORT)); |
2446ab60 | 410 | rcu_read_unlock(); |
1da177e4 LT |
411 | return 0; |
412 | } | |
413 | ||
414 | static int | |
415 | rpc_info_open(struct inode *inode, struct file *file) | |
416 | { | |
006abe88 | 417 | struct rpc_clnt *clnt = NULL; |
1da177e4 LT |
418 | int ret = single_open(file, rpc_show_info, NULL); |
419 | ||
420 | if (!ret) { | |
421 | struct seq_file *m = file->private_data; | |
006abe88 TM |
422 | |
423 | spin_lock(&file->f_path.dentry->d_lock); | |
424 | if (!d_unhashed(file->f_path.dentry)) | |
425 | clnt = RPC_I(inode)->private; | |
71d3d0eb | 426 | if (clnt != NULL && refcount_inc_not_zero(&clnt->cl_count)) { |
006abe88 | 427 | spin_unlock(&file->f_path.dentry->d_lock); |
1da177e4 LT |
428 | m->private = clnt; |
429 | } else { | |
006abe88 | 430 | spin_unlock(&file->f_path.dentry->d_lock); |
1da177e4 LT |
431 | single_release(inode, file); |
432 | ret = -EINVAL; | |
433 | } | |
1da177e4 LT |
434 | } |
435 | return ret; | |
436 | } | |
437 | ||
438 | static int | |
439 | rpc_info_release(struct inode *inode, struct file *file) | |
440 | { | |
441 | struct seq_file *m = file->private_data; | |
442 | struct rpc_clnt *clnt = (struct rpc_clnt *)m->private; | |
443 | ||
444 | if (clnt) | |
445 | rpc_release_client(clnt); | |
446 | return single_release(inode, file); | |
447 | } | |
448 | ||
da7071d7 | 449 | static const struct file_operations rpc_info_operations = { |
1da177e4 LT |
450 | .owner = THIS_MODULE, |
451 | .open = rpc_info_open, | |
452 | .read = seq_read, | |
453 | .llseek = seq_lseek, | |
454 | .release = rpc_info_release, | |
455 | }; | |
456 | ||
457 | ||
1da177e4 LT |
458 | /* |
459 | * Description of fs contents. | |
460 | */ | |
461 | struct rpc_filelist { | |
ac6fecee | 462 | const char *name; |
99ac48f5 | 463 | const struct file_operations *i_fop; |
7364af6a | 464 | umode_t mode; |
1da177e4 LT |
465 | }; |
466 | ||
1da177e4 | 467 | static struct inode * |
7364af6a | 468 | rpc_get_inode(struct super_block *sb, umode_t mode) |
1da177e4 LT |
469 | { |
470 | struct inode *inode = new_inode(sb); | |
471 | if (!inode) | |
472 | return NULL; | |
85fe4025 | 473 | inode->i_ino = get_next_ino(); |
1da177e4 | 474 | inode->i_mode = mode; |
078cd827 | 475 | inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); |
89f0e4fe JP |
476 | switch (mode & S_IFMT) { |
477 | case S_IFDIR: | |
478 | inode->i_fop = &simple_dir_operations; | |
275448eb | 479 | inode->i_op = &simple_dir_inode_operations; |
89f0e4fe | 480 | inc_nlink(inode); |
93f479d3 | 481 | break; |
89f0e4fe JP |
482 | default: |
483 | break; | |
1da177e4 LT |
484 | } |
485 | return inode; | |
486 | } | |
487 | ||
7589806e TM |
488 | static int __rpc_create_common(struct inode *dir, struct dentry *dentry, |
489 | umode_t mode, | |
490 | const struct file_operations *i_fop, | |
491 | void *private) | |
492 | { | |
493 | struct inode *inode; | |
494 | ||
beb0f0a9 | 495 | d_drop(dentry); |
7589806e TM |
496 | inode = rpc_get_inode(dir->i_sb, mode); |
497 | if (!inode) | |
498 | goto out_err; | |
499 | inode->i_ino = iunique(dir->i_sb, 100); | |
500 | if (i_fop) | |
501 | inode->i_fop = i_fop; | |
502 | if (private) | |
503 | rpc_inode_setowner(inode, private); | |
504 | d_add(dentry, inode); | |
505 | return 0; | |
506 | out_err: | |
1e903eda AV |
507 | printk(KERN_WARNING "%s: %s failed to allocate inode for dentry %pd\n", |
508 | __FILE__, __func__, dentry); | |
7589806e TM |
509 | dput(dentry); |
510 | return -ENOMEM; | |
511 | } | |
512 | ||
ac6fecee TM |
513 | static int __rpc_create(struct inode *dir, struct dentry *dentry, |
514 | umode_t mode, | |
515 | const struct file_operations *i_fop, | |
516 | void *private) | |
517 | { | |
518 | int err; | |
519 | ||
520 | err = __rpc_create_common(dir, dentry, S_IFREG | mode, i_fop, private); | |
521 | if (err) | |
522 | return err; | |
523 | fsnotify_create(dir, dentry); | |
524 | return 0; | |
525 | } | |
526 | ||
7589806e TM |
527 | static int __rpc_mkdir(struct inode *dir, struct dentry *dentry, |
528 | umode_t mode, | |
529 | const struct file_operations *i_fop, | |
530 | void *private) | |
531 | { | |
532 | int err; | |
533 | ||
534 | err = __rpc_create_common(dir, dentry, S_IFDIR | mode, i_fop, private); | |
535 | if (err) | |
536 | return err; | |
537 | inc_nlink(dir); | |
538 | fsnotify_mkdir(dir, dentry); | |
539 | return 0; | |
540 | } | |
541 | ||
ba9e0975 SK |
542 | static void |
543 | init_pipe(struct rpc_pipe *pipe) | |
544 | { | |
545 | pipe->nreaders = 0; | |
546 | pipe->nwriters = 0; | |
547 | INIT_LIST_HEAD(&pipe->in_upcall); | |
548 | INIT_LIST_HEAD(&pipe->in_downcall); | |
549 | INIT_LIST_HEAD(&pipe->pipe); | |
550 | pipe->pipelen = 0; | |
ba9e0975 SK |
551 | INIT_DELAYED_WORK(&pipe->queue_timeout, |
552 | rpc_timeout_upcall_queue); | |
553 | pipe->ops = NULL; | |
554 | spin_lock_init(&pipe->lock); | |
c239d83b SK |
555 | pipe->dentry = NULL; |
556 | } | |
ba9e0975 | 557 | |
c239d83b SK |
558 | void rpc_destroy_pipe_data(struct rpc_pipe *pipe) |
559 | { | |
560 | kfree(pipe); | |
ba9e0975 | 561 | } |
c239d83b | 562 | EXPORT_SYMBOL_GPL(rpc_destroy_pipe_data); |
ba9e0975 | 563 | |
c239d83b | 564 | struct rpc_pipe *rpc_mkpipe_data(const struct rpc_pipe_ops *ops, int flags) |
7589806e | 565 | { |
ba9e0975 | 566 | struct rpc_pipe *pipe; |
7589806e | 567 | |
ba9e0975 SK |
568 | pipe = kzalloc(sizeof(struct rpc_pipe), GFP_KERNEL); |
569 | if (!pipe) | |
c239d83b | 570 | return ERR_PTR(-ENOMEM); |
ba9e0975 | 571 | init_pipe(pipe); |
c239d83b SK |
572 | pipe->ops = ops; |
573 | pipe->flags = flags; | |
574 | return pipe; | |
575 | } | |
576 | EXPORT_SYMBOL_GPL(rpc_mkpipe_data); | |
577 | ||
578 | static int __rpc_mkpipe_dentry(struct inode *dir, struct dentry *dentry, | |
579 | umode_t mode, | |
580 | const struct file_operations *i_fop, | |
581 | void *private, | |
582 | struct rpc_pipe *pipe) | |
7589806e TM |
583 | { |
584 | struct rpc_inode *rpci; | |
585 | int err; | |
586 | ||
587 | err = __rpc_create_common(dir, dentry, S_IFIFO | mode, i_fop, private); | |
588 | if (err) | |
589 | return err; | |
c5ef6035 | 590 | rpci = RPC_I(d_inode(dentry)); |
7589806e | 591 | rpci->private = private; |
ba9e0975 | 592 | rpci->pipe = pipe; |
7589806e TM |
593 | fsnotify_create(dir, dentry); |
594 | return 0; | |
595 | } | |
596 | ||
ac6fecee TM |
597 | static int __rpc_rmdir(struct inode *dir, struct dentry *dentry) |
598 | { | |
599 | int ret; | |
600 | ||
601 | dget(dentry); | |
602 | ret = simple_rmdir(dir, dentry); | |
29044dae | 603 | d_drop(dentry); |
a35d632c AG |
604 | if (!ret) |
605 | fsnotify_rmdir(dir, dentry); | |
ac6fecee TM |
606 | dput(dentry); |
607 | return ret; | |
608 | } | |
609 | ||
810d90bc TM |
610 | static int __rpc_unlink(struct inode *dir, struct dentry *dentry) |
611 | { | |
612 | int ret; | |
613 | ||
614 | dget(dentry); | |
615 | ret = simple_unlink(dir, dentry); | |
29044dae | 616 | d_drop(dentry); |
a35d632c AG |
617 | if (!ret) |
618 | fsnotify_unlink(dir, dentry); | |
810d90bc TM |
619 | dput(dentry); |
620 | return ret; | |
621 | } | |
622 | ||
623 | static int __rpc_rmpipe(struct inode *dir, struct dentry *dentry) | |
624 | { | |
c5ef6035 | 625 | struct inode *inode = d_inode(dentry); |
810d90bc | 626 | |
810d90bc TM |
627 | rpc_close_pipes(inode); |
628 | return __rpc_unlink(dir, dentry); | |
629 | } | |
630 | ||
5bff0386 | 631 | static struct dentry *__rpc_lookup_create_exclusive(struct dentry *parent, |
d3db90b0 | 632 | const char *name) |
cfeaa4a3 | 633 | { |
d3db90b0 AV |
634 | struct qstr q = QSTR_INIT(name, strlen(name)); |
635 | struct dentry *dentry = d_hash_and_lookup(parent, &q); | |
cfeaa4a3 | 636 | if (!dentry) { |
d3db90b0 | 637 | dentry = d_alloc(parent, &q); |
5bff0386 SK |
638 | if (!dentry) |
639 | return ERR_PTR(-ENOMEM); | |
cfeaa4a3 | 640 | } |
c5ef6035 | 641 | if (d_really_is_negative(dentry)) |
cfeaa4a3 TM |
642 | return dentry; |
643 | dput(dentry); | |
644 | return ERR_PTR(-EEXIST); | |
645 | } | |
646 | ||
1da177e4 LT |
647 | /* |
648 | * FIXME: This probably has races. | |
649 | */ | |
ac6fecee TM |
650 | static void __rpc_depopulate(struct dentry *parent, |
651 | const struct rpc_filelist *files, | |
652 | int start, int eof) | |
1da177e4 | 653 | { |
c5ef6035 | 654 | struct inode *dir = d_inode(parent); |
ac6fecee TM |
655 | struct dentry *dentry; |
656 | struct qstr name; | |
657 | int i; | |
1da177e4 | 658 | |
ac6fecee TM |
659 | for (i = start; i < eof; i++) { |
660 | name.name = files[i].name; | |
661 | name.len = strlen(files[i].name); | |
d3db90b0 | 662 | dentry = d_hash_and_lookup(parent, &name); |
ac6fecee TM |
663 | |
664 | if (dentry == NULL) | |
62e1761c | 665 | continue; |
c5ef6035 | 666 | if (d_really_is_negative(dentry)) |
ac6fecee | 667 | goto next; |
c5ef6035 | 668 | switch (d_inode(dentry)->i_mode & S_IFMT) { |
ac6fecee TM |
669 | default: |
670 | BUG(); | |
671 | case S_IFREG: | |
672 | __rpc_unlink(dir, dentry); | |
1da177e4 | 673 | break; |
ac6fecee TM |
674 | case S_IFDIR: |
675 | __rpc_rmdir(dir, dentry); | |
676 | } | |
677 | next: | |
678 | dput(dentry); | |
1da177e4 | 679 | } |
ac6fecee TM |
680 | } |
681 | ||
682 | static void rpc_depopulate(struct dentry *parent, | |
683 | const struct rpc_filelist *files, | |
684 | int start, int eof) | |
685 | { | |
c5ef6035 | 686 | struct inode *dir = d_inode(parent); |
ac6fecee | 687 | |
5955102c | 688 | inode_lock_nested(dir, I_MUTEX_CHILD); |
ac6fecee | 689 | __rpc_depopulate(parent, files, start, eof); |
5955102c | 690 | inode_unlock(dir); |
1da177e4 LT |
691 | } |
692 | ||
ac6fecee TM |
693 | static int rpc_populate(struct dentry *parent, |
694 | const struct rpc_filelist *files, | |
695 | int start, int eof, | |
696 | void *private) | |
1da177e4 | 697 | { |
c5ef6035 | 698 | struct inode *dir = d_inode(parent); |
1da177e4 | 699 | struct dentry *dentry; |
ac6fecee | 700 | int i, err; |
1da177e4 | 701 | |
5955102c | 702 | inode_lock(dir); |
1da177e4 | 703 | for (i = start; i < eof; i++) { |
d3db90b0 | 704 | dentry = __rpc_lookup_create_exclusive(parent, files[i].name); |
ac6fecee TM |
705 | err = PTR_ERR(dentry); |
706 | if (IS_ERR(dentry)) | |
1da177e4 | 707 | goto out_bad; |
ac6fecee TM |
708 | switch (files[i].mode & S_IFMT) { |
709 | default: | |
710 | BUG(); | |
711 | case S_IFREG: | |
712 | err = __rpc_create(dir, dentry, | |
713 | files[i].mode, | |
714 | files[i].i_fop, | |
715 | private); | |
716 | break; | |
717 | case S_IFDIR: | |
718 | err = __rpc_mkdir(dir, dentry, | |
719 | files[i].mode, | |
720 | NULL, | |
721 | private); | |
1da177e4 | 722 | } |
ac6fecee TM |
723 | if (err != 0) |
724 | goto out_bad; | |
1da177e4 | 725 | } |
5955102c | 726 | inode_unlock(dir); |
1da177e4 LT |
727 | return 0; |
728 | out_bad: | |
ac6fecee | 729 | __rpc_depopulate(parent, files, start, eof); |
5955102c | 730 | inode_unlock(dir); |
1e903eda AV |
731 | printk(KERN_WARNING "%s: %s failed to populate directory %pd\n", |
732 | __FILE__, __func__, parent); | |
ac6fecee | 733 | return err; |
f134585a | 734 | } |
1da177e4 | 735 | |
e57aed77 | 736 | static struct dentry *rpc_mkdir_populate(struct dentry *parent, |
a95e691f | 737 | const char *name, umode_t mode, void *private, |
e57aed77 | 738 | int (*populate)(struct dentry *, void *), void *args_populate) |
f134585a | 739 | { |
f134585a | 740 | struct dentry *dentry; |
c5ef6035 | 741 | struct inode *dir = d_inode(parent); |
f134585a TM |
742 | int error; |
743 | ||
5955102c | 744 | inode_lock_nested(dir, I_MUTEX_PARENT); |
7d59d1e8 | 745 | dentry = __rpc_lookup_create_exclusive(parent, name); |
f134585a | 746 | if (IS_ERR(dentry)) |
7d59d1e8 TM |
747 | goto out; |
748 | error = __rpc_mkdir(dir, dentry, mode, NULL, private); | |
7589806e TM |
749 | if (error != 0) |
750 | goto out_err; | |
e57aed77 TM |
751 | if (populate != NULL) { |
752 | error = populate(dentry, args_populate); | |
753 | if (error) | |
754 | goto err_rmdir; | |
755 | } | |
f134585a | 756 | out: |
5955102c | 757 | inode_unlock(dir); |
5c3e985a | 758 | return dentry; |
ac6fecee | 759 | err_rmdir: |
f134585a | 760 | __rpc_rmdir(dir, dentry); |
7589806e | 761 | out_err: |
f134585a TM |
762 | dentry = ERR_PTR(error); |
763 | goto out; | |
1da177e4 LT |
764 | } |
765 | ||
e57aed77 TM |
766 | static int rpc_rmdir_depopulate(struct dentry *dentry, |
767 | void (*depopulate)(struct dentry *)) | |
1da177e4 | 768 | { |
dff02cc1 | 769 | struct dentry *parent; |
f134585a TM |
770 | struct inode *dir; |
771 | int error; | |
278c995c | 772 | |
dff02cc1 | 773 | parent = dget_parent(dentry); |
c5ef6035 | 774 | dir = d_inode(parent); |
5955102c | 775 | inode_lock_nested(dir, I_MUTEX_PARENT); |
e57aed77 TM |
776 | if (depopulate != NULL) |
777 | depopulate(dentry); | |
f134585a | 778 | error = __rpc_rmdir(dir, dentry); |
5955102c | 779 | inode_unlock(dir); |
dff02cc1 | 780 | dput(parent); |
f134585a | 781 | return error; |
1da177e4 LT |
782 | } |
783 | ||
93a44a75 | 784 | /** |
c1639be9 MCC |
785 | * rpc_mkpipe_dentry - make an rpc_pipefs file for kernel<->userspace |
786 | * communication | |
93a44a75 BF |
787 | * @parent: dentry of directory to create new "pipe" in |
788 | * @name: name of pipe | |
789 | * @private: private data to associate with the pipe, for the caller's use | |
bda14606 | 790 | * @pipe: &rpc_pipe containing input parameters |
93a44a75 BF |
791 | * |
792 | * Data is made available for userspace to read by calls to | |
793 | * rpc_queue_upcall(). The actual reads will result in calls to | |
794 | * @ops->upcall, which will be called with the file pointer, | |
795 | * message, and userspace buffer to copy to. | |
796 | * | |
797 | * Writes can come at any time, and do not necessarily have to be | |
798 | * responses to upcalls. They will result in calls to @msg->downcall. | |
799 | * | |
800 | * The @private argument passed here will be available to all these methods | |
496ad9aa | 801 | * from the file pointer, via RPC_I(file_inode(file))->private. |
93a44a75 | 802 | */ |
c239d83b SK |
803 | struct dentry *rpc_mkpipe_dentry(struct dentry *parent, const char *name, |
804 | void *private, struct rpc_pipe *pipe) | |
1da177e4 | 805 | { |
1da177e4 | 806 | struct dentry *dentry; |
c5ef6035 | 807 | struct inode *dir = d_inode(parent); |
d6444062 | 808 | umode_t umode = S_IFIFO | 0600; |
7589806e | 809 | int err; |
7364af6a | 810 | |
c239d83b | 811 | if (pipe->ops->upcall == NULL) |
d6444062 | 812 | umode &= ~0444; |
c239d83b | 813 | if (pipe->ops->downcall == NULL) |
d6444062 | 814 | umode &= ~0222; |
1da177e4 | 815 | |
5955102c | 816 | inode_lock_nested(dir, I_MUTEX_PARENT); |
d3db90b0 | 817 | dentry = __rpc_lookup_create_exclusive(parent, name); |
1da177e4 | 818 | if (IS_ERR(dentry)) |
cfeaa4a3 | 819 | goto out; |
c239d83b SK |
820 | err = __rpc_mkpipe_dentry(dir, dentry, umode, &rpc_pipe_fops, |
821 | private, pipe); | |
7589806e TM |
822 | if (err) |
823 | goto out_err; | |
f134585a | 824 | out: |
5955102c | 825 | inode_unlock(dir); |
5c3e985a | 826 | return dentry; |
7589806e TM |
827 | out_err: |
828 | dentry = ERR_PTR(err); | |
1e903eda AV |
829 | printk(KERN_WARNING "%s: %s() failed to create pipe %pd/%s (errno = %d)\n", |
830 | __FILE__, __func__, parent, name, | |
7589806e | 831 | err); |
f134585a | 832 | goto out; |
1da177e4 | 833 | } |
c239d83b | 834 | EXPORT_SYMBOL_GPL(rpc_mkpipe_dentry); |
1da177e4 | 835 | |
93a44a75 BF |
836 | /** |
837 | * rpc_unlink - remove a pipe | |
838 | * @dentry: dentry for the pipe, as returned from rpc_mkpipe | |
839 | * | |
840 | * After this call, lookups will no longer find the pipe, and any | |
841 | * attempts to read or write using preexisting opens of the pipe will | |
842 | * return -EPIPE. | |
843 | */ | |
f134585a | 844 | int |
5d67476f | 845 | rpc_unlink(struct dentry *dentry) |
1da177e4 | 846 | { |
5d67476f | 847 | struct dentry *parent; |
f134585a | 848 | struct inode *dir; |
5d67476f | 849 | int error = 0; |
1da177e4 | 850 | |
5d67476f | 851 | parent = dget_parent(dentry); |
c5ef6035 | 852 | dir = d_inode(parent); |
5955102c | 853 | inode_lock_nested(dir, I_MUTEX_PARENT); |
810d90bc | 854 | error = __rpc_rmpipe(dir, dentry); |
5955102c | 855 | inode_unlock(dir); |
5d67476f | 856 | dput(parent); |
f134585a | 857 | return error; |
1da177e4 | 858 | } |
468039ee | 859 | EXPORT_SYMBOL_GPL(rpc_unlink); |
1da177e4 | 860 | |
6739ffb7 TM |
861 | /** |
862 | * rpc_init_pipe_dir_head - initialise a struct rpc_pipe_dir_head | |
863 | * @pdh: pointer to struct rpc_pipe_dir_head | |
864 | */ | |
865 | void rpc_init_pipe_dir_head(struct rpc_pipe_dir_head *pdh) | |
866 | { | |
867 | INIT_LIST_HEAD(&pdh->pdh_entries); | |
868 | pdh->pdh_dentry = NULL; | |
869 | } | |
870 | EXPORT_SYMBOL_GPL(rpc_init_pipe_dir_head); | |
871 | ||
872 | /** | |
873 | * rpc_init_pipe_dir_object - initialise a struct rpc_pipe_dir_object | |
874 | * @pdo: pointer to struct rpc_pipe_dir_object | |
875 | * @pdo_ops: pointer to const struct rpc_pipe_dir_object_ops | |
876 | * @pdo_data: pointer to caller-defined data | |
877 | */ | |
878 | void rpc_init_pipe_dir_object(struct rpc_pipe_dir_object *pdo, | |
879 | const struct rpc_pipe_dir_object_ops *pdo_ops, | |
880 | void *pdo_data) | |
881 | { | |
882 | INIT_LIST_HEAD(&pdo->pdo_head); | |
883 | pdo->pdo_ops = pdo_ops; | |
884 | pdo->pdo_data = pdo_data; | |
885 | } | |
886 | EXPORT_SYMBOL_GPL(rpc_init_pipe_dir_object); | |
887 | ||
888 | static int | |
889 | rpc_add_pipe_dir_object_locked(struct net *net, | |
890 | struct rpc_pipe_dir_head *pdh, | |
891 | struct rpc_pipe_dir_object *pdo) | |
892 | { | |
893 | int ret = 0; | |
894 | ||
895 | if (pdh->pdh_dentry) | |
896 | ret = pdo->pdo_ops->create(pdh->pdh_dentry, pdo); | |
897 | if (ret == 0) | |
898 | list_add_tail(&pdo->pdo_head, &pdh->pdh_entries); | |
899 | return ret; | |
900 | } | |
901 | ||
902 | static void | |
903 | rpc_remove_pipe_dir_object_locked(struct net *net, | |
904 | struct rpc_pipe_dir_head *pdh, | |
905 | struct rpc_pipe_dir_object *pdo) | |
906 | { | |
907 | if (pdh->pdh_dentry) | |
908 | pdo->pdo_ops->destroy(pdh->pdh_dentry, pdo); | |
909 | list_del_init(&pdo->pdo_head); | |
910 | } | |
911 | ||
912 | /** | |
913 | * rpc_add_pipe_dir_object - associate a rpc_pipe_dir_object to a directory | |
914 | * @net: pointer to struct net | |
915 | * @pdh: pointer to struct rpc_pipe_dir_head | |
916 | * @pdo: pointer to struct rpc_pipe_dir_object | |
917 | * | |
918 | */ | |
919 | int | |
920 | rpc_add_pipe_dir_object(struct net *net, | |
921 | struct rpc_pipe_dir_head *pdh, | |
922 | struct rpc_pipe_dir_object *pdo) | |
923 | { | |
924 | int ret = 0; | |
925 | ||
926 | if (list_empty(&pdo->pdo_head)) { | |
927 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
928 | ||
929 | mutex_lock(&sn->pipefs_sb_lock); | |
930 | ret = rpc_add_pipe_dir_object_locked(net, pdh, pdo); | |
931 | mutex_unlock(&sn->pipefs_sb_lock); | |
932 | } | |
933 | return ret; | |
934 | } | |
935 | EXPORT_SYMBOL_GPL(rpc_add_pipe_dir_object); | |
936 | ||
937 | /** | |
938 | * rpc_remove_pipe_dir_object - remove a rpc_pipe_dir_object from a directory | |
939 | * @net: pointer to struct net | |
940 | * @pdh: pointer to struct rpc_pipe_dir_head | |
941 | * @pdo: pointer to struct rpc_pipe_dir_object | |
942 | * | |
943 | */ | |
944 | void | |
945 | rpc_remove_pipe_dir_object(struct net *net, | |
946 | struct rpc_pipe_dir_head *pdh, | |
947 | struct rpc_pipe_dir_object *pdo) | |
948 | { | |
949 | if (!list_empty(&pdo->pdo_head)) { | |
950 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
951 | ||
952 | mutex_lock(&sn->pipefs_sb_lock); | |
953 | rpc_remove_pipe_dir_object_locked(net, pdh, pdo); | |
954 | mutex_unlock(&sn->pipefs_sb_lock); | |
955 | } | |
956 | } | |
957 | EXPORT_SYMBOL_GPL(rpc_remove_pipe_dir_object); | |
958 | ||
298fc355 TM |
959 | /** |
960 | * rpc_find_or_alloc_pipe_dir_object | |
961 | * @net: pointer to struct net | |
962 | * @pdh: pointer to struct rpc_pipe_dir_head | |
963 | * @match: match struct rpc_pipe_dir_object to data | |
964 | * @alloc: allocate a new struct rpc_pipe_dir_object | |
965 | * @data: user defined data for match() and alloc() | |
966 | * | |
967 | */ | |
968 | struct rpc_pipe_dir_object * | |
969 | rpc_find_or_alloc_pipe_dir_object(struct net *net, | |
970 | struct rpc_pipe_dir_head *pdh, | |
971 | int (*match)(struct rpc_pipe_dir_object *, void *), | |
972 | struct rpc_pipe_dir_object *(*alloc)(void *), | |
973 | void *data) | |
974 | { | |
975 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
976 | struct rpc_pipe_dir_object *pdo; | |
977 | ||
978 | mutex_lock(&sn->pipefs_sb_lock); | |
979 | list_for_each_entry(pdo, &pdh->pdh_entries, pdo_head) { | |
980 | if (!match(pdo, data)) | |
981 | continue; | |
982 | goto out; | |
983 | } | |
984 | pdo = alloc(data); | |
985 | if (!pdo) | |
986 | goto out; | |
987 | rpc_add_pipe_dir_object_locked(net, pdh, pdo); | |
988 | out: | |
989 | mutex_unlock(&sn->pipefs_sb_lock); | |
990 | return pdo; | |
991 | } | |
992 | EXPORT_SYMBOL_GPL(rpc_find_or_alloc_pipe_dir_object); | |
993 | ||
6739ffb7 TM |
994 | static void |
995 | rpc_create_pipe_dir_objects(struct rpc_pipe_dir_head *pdh) | |
996 | { | |
997 | struct rpc_pipe_dir_object *pdo; | |
998 | struct dentry *dir = pdh->pdh_dentry; | |
999 | ||
1000 | list_for_each_entry(pdo, &pdh->pdh_entries, pdo_head) | |
1001 | pdo->pdo_ops->create(dir, pdo); | |
1002 | } | |
1003 | ||
1004 | static void | |
1005 | rpc_destroy_pipe_dir_objects(struct rpc_pipe_dir_head *pdh) | |
1006 | { | |
1007 | struct rpc_pipe_dir_object *pdo; | |
1008 | struct dentry *dir = pdh->pdh_dentry; | |
1009 | ||
1010 | list_for_each_entry(pdo, &pdh->pdh_entries, pdo_head) | |
1011 | pdo->pdo_ops->destroy(dir, pdo); | |
1012 | } | |
1013 | ||
e57aed77 TM |
1014 | enum { |
1015 | RPCAUTH_info, | |
1016 | RPCAUTH_EOF | |
1017 | }; | |
1018 | ||
1019 | static const struct rpc_filelist authfiles[] = { | |
1020 | [RPCAUTH_info] = { | |
1021 | .name = "info", | |
1022 | .i_fop = &rpc_info_operations, | |
d6444062 | 1023 | .mode = S_IFREG | 0400, |
e57aed77 TM |
1024 | }, |
1025 | }; | |
1026 | ||
1027 | static int rpc_clntdir_populate(struct dentry *dentry, void *private) | |
1028 | { | |
1029 | return rpc_populate(dentry, | |
1030 | authfiles, RPCAUTH_info, RPCAUTH_EOF, | |
1031 | private); | |
1032 | } | |
1033 | ||
1034 | static void rpc_clntdir_depopulate(struct dentry *dentry) | |
1035 | { | |
1036 | rpc_depopulate(dentry, authfiles, RPCAUTH_info, RPCAUTH_EOF); | |
1037 | } | |
1038 | ||
7d59d1e8 TM |
1039 | /** |
1040 | * rpc_create_client_dir - Create a new rpc_client directory in rpc_pipefs | |
a95e691f AV |
1041 | * @dentry: the parent of new directory |
1042 | * @name: the name of new directory | |
7d59d1e8 TM |
1043 | * @rpc_client: rpc client to associate with this directory |
1044 | * | |
1045 | * This creates a directory at the given @path associated with | |
1046 | * @rpc_clnt, which will contain a file named "info" with some basic | |
1047 | * information about the client, together with any "pipes" that may | |
1048 | * later be created using rpc_mkpipe(). | |
1049 | */ | |
23ac6581 | 1050 | struct dentry *rpc_create_client_dir(struct dentry *dentry, |
a95e691f | 1051 | const char *name, |
e57aed77 TM |
1052 | struct rpc_clnt *rpc_client) |
1053 | { | |
6739ffb7 TM |
1054 | struct dentry *ret; |
1055 | ||
d6444062 JP |
1056 | ret = rpc_mkdir_populate(dentry, name, 0555, NULL, |
1057 | rpc_clntdir_populate, rpc_client); | |
6739ffb7 TM |
1058 | if (!IS_ERR(ret)) { |
1059 | rpc_client->cl_pipedir_objects.pdh_dentry = ret; | |
1060 | rpc_create_pipe_dir_objects(&rpc_client->cl_pipedir_objects); | |
1061 | } | |
1062 | return ret; | |
e57aed77 TM |
1063 | } |
1064 | ||
1065 | /** | |
1066 | * rpc_remove_client_dir - Remove a directory created with rpc_create_client_dir() | |
6739ffb7 | 1067 | * @rpc_client: rpc_client for the pipe |
e57aed77 | 1068 | */ |
c36dcfe1 | 1069 | int rpc_remove_client_dir(struct rpc_clnt *rpc_client) |
7d59d1e8 | 1070 | { |
c36dcfe1 TM |
1071 | struct dentry *dentry = rpc_client->cl_pipedir_objects.pdh_dentry; |
1072 | ||
1073 | if (dentry == NULL) | |
1074 | return 0; | |
1075 | rpc_destroy_pipe_dir_objects(&rpc_client->cl_pipedir_objects); | |
1076 | rpc_client->cl_pipedir_objects.pdh_dentry = NULL; | |
e57aed77 | 1077 | return rpc_rmdir_depopulate(dentry, rpc_clntdir_depopulate); |
7d59d1e8 TM |
1078 | } |
1079 | ||
8854e82d TM |
1080 | static const struct rpc_filelist cache_pipefs_files[3] = { |
1081 | [0] = { | |
1082 | .name = "channel", | |
1083 | .i_fop = &cache_file_operations_pipefs, | |
d6444062 | 1084 | .mode = S_IFREG | 0600, |
8854e82d TM |
1085 | }, |
1086 | [1] = { | |
1087 | .name = "content", | |
1088 | .i_fop = &content_file_operations_pipefs, | |
d6444062 | 1089 | .mode = S_IFREG | 0400, |
8854e82d TM |
1090 | }, |
1091 | [2] = { | |
1092 | .name = "flush", | |
1093 | .i_fop = &cache_flush_operations_pipefs, | |
d6444062 | 1094 | .mode = S_IFREG | 0600, |
8854e82d TM |
1095 | }, |
1096 | }; | |
1097 | ||
1098 | static int rpc_cachedir_populate(struct dentry *dentry, void *private) | |
1099 | { | |
1100 | return rpc_populate(dentry, | |
1101 | cache_pipefs_files, 0, 3, | |
1102 | private); | |
1103 | } | |
1104 | ||
1105 | static void rpc_cachedir_depopulate(struct dentry *dentry) | |
1106 | { | |
1107 | rpc_depopulate(dentry, cache_pipefs_files, 0, 3); | |
1108 | } | |
1109 | ||
a95e691f | 1110 | struct dentry *rpc_create_cache_dir(struct dentry *parent, const char *name, |
64f1426f | 1111 | umode_t umode, struct cache_detail *cd) |
8854e82d TM |
1112 | { |
1113 | return rpc_mkdir_populate(parent, name, umode, NULL, | |
1114 | rpc_cachedir_populate, cd); | |
1115 | } | |
1116 | ||
1117 | void rpc_remove_cache_dir(struct dentry *dentry) | |
1118 | { | |
1119 | rpc_rmdir_depopulate(dentry, rpc_cachedir_depopulate); | |
1120 | } | |
1121 | ||
1da177e4 LT |
1122 | /* |
1123 | * populate the filesystem | |
1124 | */ | |
b87221de | 1125 | static const struct super_operations s_ops = { |
1da177e4 | 1126 | .alloc_inode = rpc_alloc_inode, |
bef252fa | 1127 | .free_inode = rpc_free_inode, |
1da177e4 LT |
1128 | .statfs = simple_statfs, |
1129 | }; | |
1130 | ||
1131 | #define RPCAUTH_GSSMAGIC 0x67596969 | |
1132 | ||
bb156749 TM |
1133 | /* |
1134 | * We have a single directory with 1 node in it. | |
1135 | */ | |
1136 | enum { | |
1137 | RPCAUTH_lockd, | |
1138 | RPCAUTH_mount, | |
1139 | RPCAUTH_nfs, | |
1140 | RPCAUTH_portmap, | |
1141 | RPCAUTH_statd, | |
1142 | RPCAUTH_nfsd4_cb, | |
e571cbf1 | 1143 | RPCAUTH_cache, |
b3537c35 | 1144 | RPCAUTH_nfsd, |
4b9a445e | 1145 | RPCAUTH_gssd, |
bb156749 TM |
1146 | RPCAUTH_RootEOF |
1147 | }; | |
1148 | ||
1149 | static const struct rpc_filelist files[] = { | |
1150 | [RPCAUTH_lockd] = { | |
1151 | .name = "lockd", | |
d6444062 | 1152 | .mode = S_IFDIR | 0555, |
bb156749 TM |
1153 | }, |
1154 | [RPCAUTH_mount] = { | |
1155 | .name = "mount", | |
d6444062 | 1156 | .mode = S_IFDIR | 0555, |
bb156749 TM |
1157 | }, |
1158 | [RPCAUTH_nfs] = { | |
1159 | .name = "nfs", | |
d6444062 | 1160 | .mode = S_IFDIR | 0555, |
bb156749 TM |
1161 | }, |
1162 | [RPCAUTH_portmap] = { | |
1163 | .name = "portmap", | |
d6444062 | 1164 | .mode = S_IFDIR | 0555, |
bb156749 TM |
1165 | }, |
1166 | [RPCAUTH_statd] = { | |
1167 | .name = "statd", | |
d6444062 | 1168 | .mode = S_IFDIR | 0555, |
bb156749 TM |
1169 | }, |
1170 | [RPCAUTH_nfsd4_cb] = { | |
1171 | .name = "nfsd4_cb", | |
d6444062 | 1172 | .mode = S_IFDIR | 0555, |
bb156749 | 1173 | }, |
e571cbf1 TM |
1174 | [RPCAUTH_cache] = { |
1175 | .name = "cache", | |
d6444062 | 1176 | .mode = S_IFDIR | 0555, |
e571cbf1 | 1177 | }, |
b3537c35 JL |
1178 | [RPCAUTH_nfsd] = { |
1179 | .name = "nfsd", | |
d6444062 | 1180 | .mode = S_IFDIR | 0555, |
b3537c35 | 1181 | }, |
4b9a445e JL |
1182 | [RPCAUTH_gssd] = { |
1183 | .name = "gssd", | |
d6444062 | 1184 | .mode = S_IFDIR | 0555, |
4b9a445e | 1185 | }, |
bb156749 TM |
1186 | }; |
1187 | ||
432eb1a5 SK |
1188 | /* |
1189 | * This call can be used only in RPC pipefs mount notification hooks. | |
1190 | */ | |
1191 | struct dentry *rpc_d_lookup_sb(const struct super_block *sb, | |
1192 | const unsigned char *dir_name) | |
1193 | { | |
26fe5750 | 1194 | struct qstr dir = QSTR_INIT(dir_name, strlen(dir_name)); |
d3db90b0 | 1195 | return d_hash_and_lookup(sb->s_root, &dir); |
432eb1a5 SK |
1196 | } |
1197 | EXPORT_SYMBOL_GPL(rpc_d_lookup_sb); | |
1198 | ||
4b9a445e | 1199 | int rpc_pipefs_init_net(struct net *net) |
c21a588f SK |
1200 | { |
1201 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
1202 | ||
4b9a445e JL |
1203 | sn->gssd_dummy = rpc_mkpipe_data(&gssd_dummy_pipe_ops, 0); |
1204 | if (IS_ERR(sn->gssd_dummy)) | |
1205 | return PTR_ERR(sn->gssd_dummy); | |
1206 | ||
c21a588f | 1207 | mutex_init(&sn->pipefs_sb_lock); |
2aed8b47 | 1208 | sn->pipe_version = -1; |
4b9a445e JL |
1209 | return 0; |
1210 | } | |
1211 | ||
1212 | void rpc_pipefs_exit_net(struct net *net) | |
1213 | { | |
1214 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
1215 | ||
1216 | rpc_destroy_pipe_data(sn->gssd_dummy); | |
c21a588f SK |
1217 | } |
1218 | ||
1219 | /* | |
1220 | * This call will be used for per network namespace operations calls. | |
1221 | * Note: Function will be returned with pipefs_sb_lock taken if superblock was | |
1222 | * found. This lock have to be released by rpc_put_sb_net() when all operations | |
1223 | * will be completed. | |
1224 | */ | |
1225 | struct super_block *rpc_get_sb_net(const struct net *net) | |
1226 | { | |
1227 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
1228 | ||
1229 | mutex_lock(&sn->pipefs_sb_lock); | |
1230 | if (sn->pipefs_sb) | |
1231 | return sn->pipefs_sb; | |
1232 | mutex_unlock(&sn->pipefs_sb_lock); | |
1233 | return NULL; | |
1234 | } | |
1235 | EXPORT_SYMBOL_GPL(rpc_get_sb_net); | |
1236 | ||
1237 | void rpc_put_sb_net(const struct net *net) | |
1238 | { | |
1239 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
1240 | ||
749386e9 | 1241 | WARN_ON(sn->pipefs_sb == NULL); |
c21a588f SK |
1242 | mutex_unlock(&sn->pipefs_sb_lock); |
1243 | } | |
1244 | EXPORT_SYMBOL_GPL(rpc_put_sb_net); | |
1245 | ||
4b9a445e JL |
1246 | static const struct rpc_filelist gssd_dummy_clnt_dir[] = { |
1247 | [0] = { | |
1248 | .name = "clntXX", | |
d6444062 | 1249 | .mode = S_IFDIR | 0555, |
4b9a445e JL |
1250 | }, |
1251 | }; | |
1252 | ||
1253 | static ssize_t | |
1254 | dummy_downcall(struct file *filp, const char __user *src, size_t len) | |
1255 | { | |
1256 | return -EINVAL; | |
1257 | } | |
1258 | ||
1259 | static const struct rpc_pipe_ops gssd_dummy_pipe_ops = { | |
1260 | .upcall = rpc_pipe_generic_upcall, | |
1261 | .downcall = dummy_downcall, | |
1262 | }; | |
1263 | ||
e2f0c83a JL |
1264 | /* |
1265 | * Here we present a bogus "info" file to keep rpc.gssd happy. We don't expect | |
1266 | * that it will ever use this info to handle an upcall, but rpc.gssd expects | |
1267 | * that this file will be there and have a certain format. | |
1268 | */ | |
1269 | static int | |
260f71ef | 1270 | rpc_dummy_info_show(struct seq_file *m, void *v) |
e2f0c83a JL |
1271 | { |
1272 | seq_printf(m, "RPC server: %s\n", utsname()->nodename); | |
1273 | seq_printf(m, "service: foo (1) version 0\n"); | |
1274 | seq_printf(m, "address: 127.0.0.1\n"); | |
1275 | seq_printf(m, "protocol: tcp\n"); | |
1276 | seq_printf(m, "port: 0\n"); | |
1277 | return 0; | |
1278 | } | |
260f71ef | 1279 | DEFINE_SHOW_ATTRIBUTE(rpc_dummy_info); |
e2f0c83a JL |
1280 | |
1281 | static const struct rpc_filelist gssd_dummy_info_file[] = { | |
1282 | [0] = { | |
1283 | .name = "info", | |
260f71ef | 1284 | .i_fop = &rpc_dummy_info_fops, |
d6444062 | 1285 | .mode = S_IFREG | 0400, |
e2f0c83a JL |
1286 | }, |
1287 | }; | |
1288 | ||
4b9a445e JL |
1289 | /** |
1290 | * rpc_gssd_dummy_populate - create a dummy gssd pipe | |
1291 | * @root: root of the rpc_pipefs filesystem | |
1292 | * @pipe_data: pipe data created when netns is initialized | |
1293 | * | |
1294 | * Create a dummy set of directories and a pipe that gssd can hold open to | |
1295 | * indicate that it is up and running. | |
1296 | */ | |
1297 | static struct dentry * | |
1298 | rpc_gssd_dummy_populate(struct dentry *root, struct rpc_pipe *pipe_data) | |
1299 | { | |
1300 | int ret = 0; | |
1301 | struct dentry *gssd_dentry; | |
1302 | struct dentry *clnt_dentry = NULL; | |
1303 | struct dentry *pipe_dentry = NULL; | |
1304 | struct qstr q = QSTR_INIT(files[RPCAUTH_gssd].name, | |
1305 | strlen(files[RPCAUTH_gssd].name)); | |
1306 | ||
1307 | /* We should never get this far if "gssd" doesn't exist */ | |
1308 | gssd_dentry = d_hash_and_lookup(root, &q); | |
1309 | if (!gssd_dentry) | |
1310 | return ERR_PTR(-ENOENT); | |
1311 | ||
1312 | ret = rpc_populate(gssd_dentry, gssd_dummy_clnt_dir, 0, 1, NULL); | |
1313 | if (ret) { | |
1314 | pipe_dentry = ERR_PTR(ret); | |
1315 | goto out; | |
1316 | } | |
1317 | ||
1318 | q.name = gssd_dummy_clnt_dir[0].name; | |
1319 | q.len = strlen(gssd_dummy_clnt_dir[0].name); | |
1320 | clnt_dentry = d_hash_and_lookup(gssd_dentry, &q); | |
1321 | if (!clnt_dentry) { | |
b7ade381 | 1322 | __rpc_depopulate(gssd_dentry, gssd_dummy_clnt_dir, 0, 1); |
4b9a445e JL |
1323 | pipe_dentry = ERR_PTR(-ENOENT); |
1324 | goto out; | |
1325 | } | |
1326 | ||
e2f0c83a JL |
1327 | ret = rpc_populate(clnt_dentry, gssd_dummy_info_file, 0, 1, NULL); |
1328 | if (ret) { | |
1329 | __rpc_depopulate(gssd_dentry, gssd_dummy_clnt_dir, 0, 1); | |
1330 | pipe_dentry = ERR_PTR(ret); | |
1331 | goto out; | |
1332 | } | |
1333 | ||
4b9a445e | 1334 | pipe_dentry = rpc_mkpipe_dentry(clnt_dentry, "gssd", NULL, pipe_data); |
e2f0c83a JL |
1335 | if (IS_ERR(pipe_dentry)) { |
1336 | __rpc_depopulate(clnt_dentry, gssd_dummy_info_file, 0, 1); | |
3396f92f | 1337 | __rpc_depopulate(gssd_dentry, gssd_dummy_clnt_dir, 0, 1); |
e2f0c83a | 1338 | } |
4b9a445e JL |
1339 | out: |
1340 | dput(clnt_dentry); | |
1341 | dput(gssd_dentry); | |
1342 | return pipe_dentry; | |
1343 | } | |
1344 | ||
23e66ba9 JL |
1345 | static void |
1346 | rpc_gssd_dummy_depopulate(struct dentry *pipe_dentry) | |
1347 | { | |
1348 | struct dentry *clnt_dir = pipe_dentry->d_parent; | |
1349 | struct dentry *gssd_dir = clnt_dir->d_parent; | |
1350 | ||
4a3877c4 | 1351 | dget(pipe_dentry); |
c5ef6035 | 1352 | __rpc_rmpipe(d_inode(clnt_dir), pipe_dentry); |
23e66ba9 JL |
1353 | __rpc_depopulate(clnt_dir, gssd_dummy_info_file, 0, 1); |
1354 | __rpc_depopulate(gssd_dir, gssd_dummy_clnt_dir, 0, 1); | |
1355 | dput(pipe_dentry); | |
1356 | } | |
1357 | ||
1da177e4 | 1358 | static int |
b9662f31 | 1359 | rpc_fill_super(struct super_block *sb, struct fs_context *fc) |
1da177e4 LT |
1360 | { |
1361 | struct inode *inode; | |
4b9a445e | 1362 | struct dentry *root, *gssd_dentry; |
b9662f31 | 1363 | struct net *net = sb->s_fs_info; |
90c4e829 | 1364 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
2d00131a | 1365 | int err; |
1da177e4 | 1366 | |
09cbfeaf KS |
1367 | sb->s_blocksize = PAGE_SIZE; |
1368 | sb->s_blocksize_bits = PAGE_SHIFT; | |
1da177e4 LT |
1369 | sb->s_magic = RPCAUTH_GSSMAGIC; |
1370 | sb->s_op = &s_ops; | |
b26d4cd3 | 1371 | sb->s_d_op = &simple_dentry_operations; |
1da177e4 LT |
1372 | sb->s_time_gran = 1; |
1373 | ||
d6444062 | 1374 | inode = rpc_get_inode(sb, S_IFDIR | 0555); |
48fde701 AV |
1375 | sb->s_root = root = d_make_root(inode); |
1376 | if (!root) | |
1da177e4 | 1377 | return -ENOMEM; |
ac6fecee | 1378 | if (rpc_populate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF, NULL)) |
fc7bed8c | 1379 | return -ENOMEM; |
4b9a445e JL |
1380 | |
1381 | gssd_dentry = rpc_gssd_dummy_populate(root, sn->gssd_dummy); | |
1382 | if (IS_ERR(gssd_dentry)) { | |
1383 | __rpc_depopulate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF); | |
1384 | return PTR_ERR(gssd_dentry); | |
1385 | } | |
1386 | ||
6c67a3e4 VA |
1387 | dprintk("RPC: sending pipefs MOUNT notification for net %x%s\n", |
1388 | net->ns.inum, NET_NAME(net)); | |
38481605 | 1389 | mutex_lock(&sn->pipefs_sb_lock); |
37629b57 | 1390 | sn->pipefs_sb = sb; |
2d00131a SK |
1391 | err = blocking_notifier_call_chain(&rpc_pipefs_notifier_list, |
1392 | RPC_PIPEFS_MOUNT, | |
1393 | sb); | |
1394 | if (err) | |
1395 | goto err_depopulate; | |
38481605 | 1396 | mutex_unlock(&sn->pipefs_sb_lock); |
1da177e4 | 1397 | return 0; |
2d00131a SK |
1398 | |
1399 | err_depopulate: | |
23e66ba9 | 1400 | rpc_gssd_dummy_depopulate(gssd_dentry); |
2d00131a SK |
1401 | blocking_notifier_call_chain(&rpc_pipefs_notifier_list, |
1402 | RPC_PIPEFS_UMOUNT, | |
1403 | sb); | |
37629b57 | 1404 | sn->pipefs_sb = NULL; |
2d00131a | 1405 | __rpc_depopulate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF); |
38481605 | 1406 | mutex_unlock(&sn->pipefs_sb_lock); |
2d00131a | 1407 | return err; |
1da177e4 LT |
1408 | } |
1409 | ||
89f84243 JL |
1410 | bool |
1411 | gssd_running(struct net *net) | |
1412 | { | |
1413 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
1414 | struct rpc_pipe *pipe = sn->gssd_dummy; | |
1415 | ||
1416 | return pipe->nreaders || pipe->nwriters; | |
1417 | } | |
1418 | EXPORT_SYMBOL_GPL(gssd_running); | |
1419 | ||
b9662f31 DH |
1420 | static int rpc_fs_get_tree(struct fs_context *fc) |
1421 | { | |
533770cc | 1422 | return get_tree_keyed(fc, rpc_fill_super, get_net(fc->net_ns)); |
b9662f31 DH |
1423 | } |
1424 | ||
1425 | static void rpc_fs_free_fc(struct fs_context *fc) | |
1da177e4 | 1426 | { |
b9662f31 DH |
1427 | if (fc->s_fs_info) |
1428 | put_net(fc->s_fs_info); | |
1429 | } | |
1430 | ||
1431 | static const struct fs_context_operations rpc_fs_context_ops = { | |
1432 | .free = rpc_fs_free_fc, | |
1433 | .get_tree = rpc_fs_get_tree, | |
1434 | }; | |
1435 | ||
1436 | static int rpc_init_fs_context(struct fs_context *fc) | |
1437 | { | |
1438 | put_user_ns(fc->user_ns); | |
1439 | fc->user_ns = get_user_ns(fc->net_ns->user_ns); | |
1440 | fc->ops = &rpc_fs_context_ops; | |
1441 | return 0; | |
1da177e4 LT |
1442 | } |
1443 | ||
09acfea5 | 1444 | static void rpc_kill_sb(struct super_block *sb) |
021c68de SK |
1445 | { |
1446 | struct net *net = sb->s_fs_info; | |
90c4e829 | 1447 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
021c68de | 1448 | |
c21a588f | 1449 | mutex_lock(&sn->pipefs_sb_lock); |
642fe4d0 TM |
1450 | if (sn->pipefs_sb != sb) { |
1451 | mutex_unlock(&sn->pipefs_sb_lock); | |
1452 | goto out; | |
1453 | } | |
90c4e829 | 1454 | sn->pipefs_sb = NULL; |
6c67a3e4 VA |
1455 | dprintk("RPC: sending pipefs UMOUNT notification for net %x%s\n", |
1456 | net->ns.inum, NET_NAME(net)); | |
2d00131a SK |
1457 | blocking_notifier_call_chain(&rpc_pipefs_notifier_list, |
1458 | RPC_PIPEFS_UMOUNT, | |
1459 | sb); | |
adb6fa7f | 1460 | mutex_unlock(&sn->pipefs_sb_lock); |
642fe4d0 | 1461 | out: |
021c68de | 1462 | kill_litter_super(sb); |
d91ee87d | 1463 | put_net(net); |
1da177e4 LT |
1464 | } |
1465 | ||
1466 | static struct file_system_type rpc_pipe_fs_type = { | |
1467 | .owner = THIS_MODULE, | |
1468 | .name = "rpc_pipefs", | |
b9662f31 | 1469 | .init_fs_context = rpc_init_fs_context, |
021c68de | 1470 | .kill_sb = rpc_kill_sb, |
1da177e4 | 1471 | }; |
7f78e035 | 1472 | MODULE_ALIAS_FS("rpc_pipefs"); |
fa7614dd | 1473 | MODULE_ALIAS("rpc_pipefs"); |
1da177e4 LT |
1474 | |
1475 | static void | |
51cc5068 | 1476 | init_once(void *foo) |
1da177e4 LT |
1477 | { |
1478 | struct rpc_inode *rpci = (struct rpc_inode *) foo; | |
1479 | ||
a35afb83 CL |
1480 | inode_init_once(&rpci->vfs_inode); |
1481 | rpci->private = NULL; | |
ba9e0975 | 1482 | rpci->pipe = NULL; |
a35afb83 | 1483 | init_waitqueue_head(&rpci->waitq); |
1da177e4 LT |
1484 | } |
1485 | ||
1486 | int register_rpc_pipefs(void) | |
1487 | { | |
5bd5f581 AM |
1488 | int err; |
1489 | ||
1da177e4 | 1490 | rpc_inode_cachep = kmem_cache_create("rpc_inode_cache", |
fffb60f9 PJ |
1491 | sizeof(struct rpc_inode), |
1492 | 0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| | |
5d097056 | 1493 | SLAB_MEM_SPREAD|SLAB_ACCOUNT), |
20c2df83 | 1494 | init_once); |
1da177e4 LT |
1495 | if (!rpc_inode_cachep) |
1496 | return -ENOMEM; | |
80df9d20 SK |
1497 | err = rpc_clients_notifier_register(); |
1498 | if (err) | |
1499 | goto err_notifier; | |
5bd5f581 | 1500 | err = register_filesystem(&rpc_pipe_fs_type); |
80df9d20 SK |
1501 | if (err) |
1502 | goto err_register; | |
1da177e4 | 1503 | return 0; |
80df9d20 SK |
1504 | |
1505 | err_register: | |
1506 | rpc_clients_notifier_unregister(); | |
1507 | err_notifier: | |
1508 | kmem_cache_destroy(rpc_inode_cachep); | |
1509 | return err; | |
1da177e4 LT |
1510 | } |
1511 | ||
1512 | void unregister_rpc_pipefs(void) | |
1513 | { | |
80df9d20 | 1514 | rpc_clients_notifier_unregister(); |
1da177e4 | 1515 | unregister_filesystem(&rpc_pipe_fs_type); |
4a400f0d | 1516 | kmem_cache_destroy(rpc_inode_cachep); |
1da177e4 | 1517 | } |