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Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * net/sunrpc/rpc_pipe.c | |
3 | * | |
4 | * Userland/kernel interface for rpcauth_gss. | |
5 | * Code shamelessly plagiarized from fs/nfsd/nfsctl.c | |
d51fe1be | 6 | * and fs/sysfs/inode.c |
1da177e4 LT |
7 | * |
8 | * Copyright (c) 2002, Trond Myklebust <trond.myklebust@fys.uio.no> | |
9 | * | |
10 | */ | |
1da177e4 LT |
11 | #include <linux/module.h> |
12 | #include <linux/slab.h> | |
13 | #include <linux/string.h> | |
14 | #include <linux/pagemap.h> | |
15 | #include <linux/mount.h> | |
16 | #include <linux/namei.h> | |
50e437d5 | 17 | #include <linux/fsnotify.h> |
1da177e4 | 18 | #include <linux/kernel.h> |
2446ab60 | 19 | #include <linux/rcupdate.h> |
e2f0c83a | 20 | #include <linux/utsname.h> |
1da177e4 LT |
21 | |
22 | #include <asm/ioctls.h> | |
1da177e4 LT |
23 | #include <linux/poll.h> |
24 | #include <linux/wait.h> | |
25 | #include <linux/seq_file.h> | |
26 | ||
27 | #include <linux/sunrpc/clnt.h> | |
28 | #include <linux/workqueue.h> | |
29 | #include <linux/sunrpc/rpc_pipe_fs.h> | |
8854e82d | 30 | #include <linux/sunrpc/cache.h> |
021c68de | 31 | #include <linux/nsproxy.h> |
2d00131a | 32 | #include <linux/notifier.h> |
1da177e4 | 33 | |
021c68de | 34 | #include "netns.h" |
2d00131a | 35 | #include "sunrpc.h" |
1da177e4 | 36 | |
efc46bf2 SK |
37 | #define RPCDBG_FACILITY RPCDBG_DEBUG |
38 | ||
39 | #define NET_NAME(net) ((net == &init_net) ? " (init_net)" : "") | |
1da177e4 LT |
40 | |
41 | static struct file_system_type rpc_pipe_fs_type; | |
4b9a445e | 42 | static const struct rpc_pipe_ops gssd_dummy_pipe_ops; |
1da177e4 | 43 | |
e18b890b | 44 | static struct kmem_cache *rpc_inode_cachep __read_mostly; |
1da177e4 LT |
45 | |
46 | #define RPC_UPCALL_TIMEOUT (30*HZ) | |
47 | ||
2d00131a SK |
48 | static BLOCKING_NOTIFIER_HEAD(rpc_pipefs_notifier_list); |
49 | ||
50 | int rpc_pipefs_notifier_register(struct notifier_block *nb) | |
51 | { | |
52 | return blocking_notifier_chain_cond_register(&rpc_pipefs_notifier_list, nb); | |
53 | } | |
54 | EXPORT_SYMBOL_GPL(rpc_pipefs_notifier_register); | |
55 | ||
56 | void rpc_pipefs_notifier_unregister(struct notifier_block *nb) | |
57 | { | |
58 | blocking_notifier_chain_unregister(&rpc_pipefs_notifier_list, nb); | |
59 | } | |
60 | EXPORT_SYMBOL_GPL(rpc_pipefs_notifier_unregister); | |
61 | ||
591ad7fe | 62 | static void rpc_purge_list(wait_queue_head_t *waitq, struct list_head *head, |
9842ef35 | 63 | void (*destroy_msg)(struct rpc_pipe_msg *), int err) |
1da177e4 | 64 | { |
1da177e4 LT |
65 | struct rpc_pipe_msg *msg; |
66 | ||
9842ef35 TM |
67 | if (list_empty(head)) |
68 | return; | |
69 | do { | |
b3eb67a2 | 70 | msg = list_entry(head->next, struct rpc_pipe_msg, list); |
5a67657a | 71 | list_del_init(&msg->list); |
1da177e4 | 72 | msg->errno = err; |
b3eb67a2 | 73 | destroy_msg(msg); |
9842ef35 | 74 | } while (!list_empty(head)); |
92123e06 JL |
75 | |
76 | if (waitq) | |
77 | wake_up(waitq); | |
1da177e4 LT |
78 | } |
79 | ||
80 | static void | |
65f27f38 | 81 | rpc_timeout_upcall_queue(struct work_struct *work) |
1da177e4 | 82 | { |
9842ef35 | 83 | LIST_HEAD(free_list); |
ba9e0975 SK |
84 | struct rpc_pipe *pipe = |
85 | container_of(work, struct rpc_pipe, queue_timeout.work); | |
9842ef35 | 86 | void (*destroy_msg)(struct rpc_pipe_msg *); |
591ad7fe | 87 | struct dentry *dentry; |
1da177e4 | 88 | |
ba9e0975 | 89 | spin_lock(&pipe->lock); |
ba9e0975 SK |
90 | destroy_msg = pipe->ops->destroy_msg; |
91 | if (pipe->nreaders == 0) { | |
92 | list_splice_init(&pipe->pipe, &free_list); | |
93 | pipe->pipelen = 0; | |
9842ef35 | 94 | } |
591ad7fe | 95 | dentry = dget(pipe->dentry); |
ba9e0975 | 96 | spin_unlock(&pipe->lock); |
92123e06 JL |
97 | rpc_purge_list(dentry ? &RPC_I(dentry->d_inode)->waitq : NULL, |
98 | &free_list, destroy_msg, -ETIMEDOUT); | |
99 | dput(dentry); | |
1da177e4 LT |
100 | } |
101 | ||
c1225158 PT |
102 | ssize_t rpc_pipe_generic_upcall(struct file *filp, struct rpc_pipe_msg *msg, |
103 | char __user *dst, size_t buflen) | |
104 | { | |
105 | char *data = (char *)msg->data + msg->copied; | |
106 | size_t mlen = min(msg->len - msg->copied, buflen); | |
107 | unsigned long left; | |
108 | ||
109 | left = copy_to_user(dst, data, mlen); | |
110 | if (left == mlen) { | |
111 | msg->errno = -EFAULT; | |
112 | return -EFAULT; | |
113 | } | |
114 | ||
115 | mlen -= left; | |
116 | msg->copied += mlen; | |
117 | msg->errno = 0; | |
118 | return mlen; | |
119 | } | |
120 | EXPORT_SYMBOL_GPL(rpc_pipe_generic_upcall); | |
121 | ||
93a44a75 | 122 | /** |
1a5778aa | 123 | * rpc_queue_upcall - queue an upcall message to userspace |
bda14606 | 124 | * @pipe: upcall pipe on which to queue given message |
93a44a75 BF |
125 | * @msg: message to queue |
126 | * | |
127 | * Call with an @inode created by rpc_mkpipe() to queue an upcall. | |
128 | * A userspace process may then later read the upcall by performing a | |
129 | * read on an open file for this inode. It is up to the caller to | |
130 | * initialize the fields of @msg (other than @msg->list) appropriately. | |
131 | */ | |
1da177e4 | 132 | int |
d706ed1f | 133 | rpc_queue_upcall(struct rpc_pipe *pipe, struct rpc_pipe_msg *msg) |
1da177e4 | 134 | { |
6070fe6f | 135 | int res = -EPIPE; |
591ad7fe | 136 | struct dentry *dentry; |
1da177e4 | 137 | |
d0fe13ba | 138 | spin_lock(&pipe->lock); |
d0fe13ba SK |
139 | if (pipe->nreaders) { |
140 | list_add_tail(&msg->list, &pipe->pipe); | |
141 | pipe->pipelen += msg->len; | |
6070fe6f | 142 | res = 0; |
d0fe13ba SK |
143 | } else if (pipe->flags & RPC_PIPE_WAIT_FOR_OPEN) { |
144 | if (list_empty(&pipe->pipe)) | |
24c5d9d7 | 145 | queue_delayed_work(rpciod_workqueue, |
d0fe13ba | 146 | &pipe->queue_timeout, |
1da177e4 | 147 | RPC_UPCALL_TIMEOUT); |
d0fe13ba SK |
148 | list_add_tail(&msg->list, &pipe->pipe); |
149 | pipe->pipelen += msg->len; | |
6070fe6f TM |
150 | res = 0; |
151 | } | |
591ad7fe | 152 | dentry = dget(pipe->dentry); |
d0fe13ba | 153 | spin_unlock(&pipe->lock); |
591ad7fe SK |
154 | if (dentry) { |
155 | wake_up(&RPC_I(dentry->d_inode)->waitq); | |
156 | dput(dentry); | |
157 | } | |
1da177e4 LT |
158 | return res; |
159 | } | |
468039ee | 160 | EXPORT_SYMBOL_GPL(rpc_queue_upcall); |
1da177e4 | 161 | |
6070fe6f TM |
162 | static inline void |
163 | rpc_inode_setowner(struct inode *inode, void *private) | |
164 | { | |
165 | RPC_I(inode)->private = private; | |
166 | } | |
167 | ||
1da177e4 LT |
168 | static void |
169 | rpc_close_pipes(struct inode *inode) | |
170 | { | |
ba9e0975 | 171 | struct rpc_pipe *pipe = RPC_I(inode)->pipe; |
e712804a | 172 | int need_release; |
ad6b1340 | 173 | LIST_HEAD(free_list); |
1da177e4 | 174 | |
1b1dcc1b | 175 | mutex_lock(&inode->i_mutex); |
ad6b1340 SK |
176 | spin_lock(&pipe->lock); |
177 | need_release = pipe->nreaders != 0 || pipe->nwriters != 0; | |
178 | pipe->nreaders = 0; | |
179 | list_splice_init(&pipe->in_upcall, &free_list); | |
180 | list_splice_init(&pipe->pipe, &free_list); | |
181 | pipe->pipelen = 0; | |
182 | pipe->dentry = NULL; | |
183 | spin_unlock(&pipe->lock); | |
591ad7fe | 184 | rpc_purge_list(&RPC_I(inode)->waitq, &free_list, pipe->ops->destroy_msg, -EPIPE); |
ad6b1340 SK |
185 | pipe->nwriters = 0; |
186 | if (need_release && pipe->ops->release_pipe) | |
187 | pipe->ops->release_pipe(inode); | |
188 | cancel_delayed_work_sync(&pipe->queue_timeout); | |
6070fe6f | 189 | rpc_inode_setowner(inode, NULL); |
2c9030ee | 190 | RPC_I(inode)->pipe = NULL; |
1b1dcc1b | 191 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
192 | } |
193 | ||
1da177e4 LT |
194 | static struct inode * |
195 | rpc_alloc_inode(struct super_block *sb) | |
196 | { | |
197 | struct rpc_inode *rpci; | |
adcda652 | 198 | rpci = kmem_cache_alloc(rpc_inode_cachep, GFP_KERNEL); |
1da177e4 LT |
199 | if (!rpci) |
200 | return NULL; | |
201 | return &rpci->vfs_inode; | |
202 | } | |
203 | ||
204 | static void | |
fa0d7e3d | 205 | rpc_i_callback(struct rcu_head *head) |
1da177e4 | 206 | { |
fa0d7e3d | 207 | struct inode *inode = container_of(head, struct inode, i_rcu); |
1da177e4 LT |
208 | kmem_cache_free(rpc_inode_cachep, RPC_I(inode)); |
209 | } | |
210 | ||
fa0d7e3d NP |
211 | static void |
212 | rpc_destroy_inode(struct inode *inode) | |
213 | { | |
214 | call_rcu(&inode->i_rcu, rpc_i_callback); | |
215 | } | |
216 | ||
1da177e4 LT |
217 | static int |
218 | rpc_pipe_open(struct inode *inode, struct file *filp) | |
219 | { | |
2c9030ee | 220 | struct rpc_pipe *pipe; |
c3810608 | 221 | int first_open; |
1da177e4 LT |
222 | int res = -ENXIO; |
223 | ||
1b1dcc1b | 224 | mutex_lock(&inode->i_mutex); |
2c9030ee SK |
225 | pipe = RPC_I(inode)->pipe; |
226 | if (pipe == NULL) | |
c3810608 | 227 | goto out; |
d0fe13ba SK |
228 | first_open = pipe->nreaders == 0 && pipe->nwriters == 0; |
229 | if (first_open && pipe->ops->open_pipe) { | |
230 | res = pipe->ops->open_pipe(inode); | |
c3810608 BF |
231 | if (res) |
232 | goto out; | |
1da177e4 | 233 | } |
c3810608 | 234 | if (filp->f_mode & FMODE_READ) |
d0fe13ba | 235 | pipe->nreaders++; |
c3810608 | 236 | if (filp->f_mode & FMODE_WRITE) |
d0fe13ba | 237 | pipe->nwriters++; |
c3810608 BF |
238 | res = 0; |
239 | out: | |
1b1dcc1b | 240 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
241 | return res; |
242 | } | |
243 | ||
244 | static int | |
245 | rpc_pipe_release(struct inode *inode, struct file *filp) | |
246 | { | |
2c9030ee | 247 | struct rpc_pipe *pipe; |
1da177e4 | 248 | struct rpc_pipe_msg *msg; |
e712804a | 249 | int last_close; |
1da177e4 | 250 | |
1b1dcc1b | 251 | mutex_lock(&inode->i_mutex); |
2c9030ee SK |
252 | pipe = RPC_I(inode)->pipe; |
253 | if (pipe == NULL) | |
1da177e4 | 254 | goto out; |
655b5bb4 | 255 | msg = filp->private_data; |
1da177e4 | 256 | if (msg != NULL) { |
ba9e0975 | 257 | spin_lock(&pipe->lock); |
48e49187 | 258 | msg->errno = -EAGAIN; |
5a67657a | 259 | list_del_init(&msg->list); |
ba9e0975 SK |
260 | spin_unlock(&pipe->lock); |
261 | pipe->ops->destroy_msg(msg); | |
1da177e4 LT |
262 | } |
263 | if (filp->f_mode & FMODE_WRITE) | |
ba9e0975 | 264 | pipe->nwriters --; |
9842ef35 | 265 | if (filp->f_mode & FMODE_READ) { |
ba9e0975 SK |
266 | pipe->nreaders --; |
267 | if (pipe->nreaders == 0) { | |
9842ef35 | 268 | LIST_HEAD(free_list); |
ba9e0975 SK |
269 | spin_lock(&pipe->lock); |
270 | list_splice_init(&pipe->pipe, &free_list); | |
271 | pipe->pipelen = 0; | |
272 | spin_unlock(&pipe->lock); | |
591ad7fe | 273 | rpc_purge_list(&RPC_I(inode)->waitq, &free_list, |
ba9e0975 | 274 | pipe->ops->destroy_msg, -EAGAIN); |
9842ef35 TM |
275 | } |
276 | } | |
ba9e0975 SK |
277 | last_close = pipe->nwriters == 0 && pipe->nreaders == 0; |
278 | if (last_close && pipe->ops->release_pipe) | |
279 | pipe->ops->release_pipe(inode); | |
1da177e4 | 280 | out: |
1b1dcc1b | 281 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
282 | return 0; |
283 | } | |
284 | ||
285 | static ssize_t | |
286 | rpc_pipe_read(struct file *filp, char __user *buf, size_t len, loff_t *offset) | |
287 | { | |
496ad9aa | 288 | struct inode *inode = file_inode(filp); |
2c9030ee | 289 | struct rpc_pipe *pipe; |
1da177e4 LT |
290 | struct rpc_pipe_msg *msg; |
291 | int res = 0; | |
292 | ||
1b1dcc1b | 293 | mutex_lock(&inode->i_mutex); |
2c9030ee SK |
294 | pipe = RPC_I(inode)->pipe; |
295 | if (pipe == NULL) { | |
1da177e4 LT |
296 | res = -EPIPE; |
297 | goto out_unlock; | |
298 | } | |
299 | msg = filp->private_data; | |
300 | if (msg == NULL) { | |
d0fe13ba SK |
301 | spin_lock(&pipe->lock); |
302 | if (!list_empty(&pipe->pipe)) { | |
303 | msg = list_entry(pipe->pipe.next, | |
1da177e4 LT |
304 | struct rpc_pipe_msg, |
305 | list); | |
d0fe13ba SK |
306 | list_move(&msg->list, &pipe->in_upcall); |
307 | pipe->pipelen -= msg->len; | |
1da177e4 LT |
308 | filp->private_data = msg; |
309 | msg->copied = 0; | |
310 | } | |
d0fe13ba | 311 | spin_unlock(&pipe->lock); |
1da177e4 LT |
312 | if (msg == NULL) |
313 | goto out_unlock; | |
314 | } | |
315 | /* NOTE: it is up to the callback to update msg->copied */ | |
d0fe13ba | 316 | res = pipe->ops->upcall(filp, msg, buf, len); |
1da177e4 LT |
317 | if (res < 0 || msg->len == msg->copied) { |
318 | filp->private_data = NULL; | |
d0fe13ba | 319 | spin_lock(&pipe->lock); |
5a67657a | 320 | list_del_init(&msg->list); |
d0fe13ba SK |
321 | spin_unlock(&pipe->lock); |
322 | pipe->ops->destroy_msg(msg); | |
1da177e4 LT |
323 | } |
324 | out_unlock: | |
1b1dcc1b | 325 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
326 | return res; |
327 | } | |
328 | ||
329 | static ssize_t | |
330 | rpc_pipe_write(struct file *filp, const char __user *buf, size_t len, loff_t *offset) | |
331 | { | |
496ad9aa | 332 | struct inode *inode = file_inode(filp); |
1da177e4 LT |
333 | int res; |
334 | ||
1b1dcc1b | 335 | mutex_lock(&inode->i_mutex); |
1da177e4 | 336 | res = -EPIPE; |
2c9030ee SK |
337 | if (RPC_I(inode)->pipe != NULL) |
338 | res = RPC_I(inode)->pipe->ops->downcall(filp, buf, len); | |
1b1dcc1b | 339 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
340 | return res; |
341 | } | |
342 | ||
343 | static unsigned int | |
344 | rpc_pipe_poll(struct file *filp, struct poll_table_struct *wait) | |
345 | { | |
496ad9aa | 346 | struct inode *inode = file_inode(filp); |
591ad7fe SK |
347 | struct rpc_inode *rpci = RPC_I(inode); |
348 | unsigned int mask = POLLOUT | POLLWRNORM; | |
1da177e4 | 349 | |
1da177e4 LT |
350 | poll_wait(filp, &rpci->waitq, wait); |
351 | ||
591ad7fe SK |
352 | mutex_lock(&inode->i_mutex); |
353 | if (rpci->pipe == NULL) | |
1da177e4 | 354 | mask |= POLLERR | POLLHUP; |
591ad7fe | 355 | else if (filp->private_data || !list_empty(&rpci->pipe->pipe)) |
1da177e4 | 356 | mask |= POLLIN | POLLRDNORM; |
591ad7fe | 357 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
358 | return mask; |
359 | } | |
360 | ||
a6f8dbc6 AB |
361 | static long |
362 | rpc_pipe_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) | |
1da177e4 | 363 | { |
496ad9aa | 364 | struct inode *inode = file_inode(filp); |
2c9030ee | 365 | struct rpc_pipe *pipe; |
1da177e4 LT |
366 | int len; |
367 | ||
368 | switch (cmd) { | |
369 | case FIONREAD: | |
2c9030ee SK |
370 | mutex_lock(&inode->i_mutex); |
371 | pipe = RPC_I(inode)->pipe; | |
372 | if (pipe == NULL) { | |
373 | mutex_unlock(&inode->i_mutex); | |
1da177e4 | 374 | return -EPIPE; |
a6f8dbc6 | 375 | } |
2c9030ee | 376 | spin_lock(&pipe->lock); |
d0fe13ba | 377 | len = pipe->pipelen; |
1da177e4 LT |
378 | if (filp->private_data) { |
379 | struct rpc_pipe_msg *msg; | |
655b5bb4 | 380 | msg = filp->private_data; |
1da177e4 LT |
381 | len += msg->len - msg->copied; |
382 | } | |
d0fe13ba | 383 | spin_unlock(&pipe->lock); |
2c9030ee | 384 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
385 | return put_user(len, (int __user *)arg); |
386 | default: | |
387 | return -EINVAL; | |
388 | } | |
389 | } | |
390 | ||
da7071d7 | 391 | static const struct file_operations rpc_pipe_fops = { |
1da177e4 LT |
392 | .owner = THIS_MODULE, |
393 | .llseek = no_llseek, | |
394 | .read = rpc_pipe_read, | |
395 | .write = rpc_pipe_write, | |
396 | .poll = rpc_pipe_poll, | |
674b604c | 397 | .unlocked_ioctl = rpc_pipe_ioctl, |
1da177e4 LT |
398 | .open = rpc_pipe_open, |
399 | .release = rpc_pipe_release, | |
400 | }; | |
401 | ||
402 | static int | |
403 | rpc_show_info(struct seq_file *m, void *v) | |
404 | { | |
405 | struct rpc_clnt *clnt = m->private; | |
406 | ||
2446ab60 | 407 | rcu_read_lock(); |
4e0038b6 TM |
408 | seq_printf(m, "RPC server: %s\n", |
409 | rcu_dereference(clnt->cl_xprt)->servername); | |
55909f21 | 410 | seq_printf(m, "service: %s (%d) version %d\n", clnt->cl_program->name, |
1da177e4 | 411 | clnt->cl_prog, clnt->cl_vers); |
e7f78657 CL |
412 | seq_printf(m, "address: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_ADDR)); |
413 | seq_printf(m, "protocol: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PROTO)); | |
bf19aace | 414 | seq_printf(m, "port: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PORT)); |
2446ab60 | 415 | rcu_read_unlock(); |
1da177e4 LT |
416 | return 0; |
417 | } | |
418 | ||
419 | static int | |
420 | rpc_info_open(struct inode *inode, struct file *file) | |
421 | { | |
006abe88 | 422 | struct rpc_clnt *clnt = NULL; |
1da177e4 LT |
423 | int ret = single_open(file, rpc_show_info, NULL); |
424 | ||
425 | if (!ret) { | |
426 | struct seq_file *m = file->private_data; | |
006abe88 TM |
427 | |
428 | spin_lock(&file->f_path.dentry->d_lock); | |
429 | if (!d_unhashed(file->f_path.dentry)) | |
430 | clnt = RPC_I(inode)->private; | |
431 | if (clnt != NULL && atomic_inc_not_zero(&clnt->cl_count)) { | |
432 | spin_unlock(&file->f_path.dentry->d_lock); | |
1da177e4 LT |
433 | m->private = clnt; |
434 | } else { | |
006abe88 | 435 | spin_unlock(&file->f_path.dentry->d_lock); |
1da177e4 LT |
436 | single_release(inode, file); |
437 | ret = -EINVAL; | |
438 | } | |
1da177e4 LT |
439 | } |
440 | return ret; | |
441 | } | |
442 | ||
443 | static int | |
444 | rpc_info_release(struct inode *inode, struct file *file) | |
445 | { | |
446 | struct seq_file *m = file->private_data; | |
447 | struct rpc_clnt *clnt = (struct rpc_clnt *)m->private; | |
448 | ||
449 | if (clnt) | |
450 | rpc_release_client(clnt); | |
451 | return single_release(inode, file); | |
452 | } | |
453 | ||
da7071d7 | 454 | static const struct file_operations rpc_info_operations = { |
1da177e4 LT |
455 | .owner = THIS_MODULE, |
456 | .open = rpc_info_open, | |
457 | .read = seq_read, | |
458 | .llseek = seq_lseek, | |
459 | .release = rpc_info_release, | |
460 | }; | |
461 | ||
462 | ||
1da177e4 LT |
463 | /* |
464 | * Description of fs contents. | |
465 | */ | |
466 | struct rpc_filelist { | |
ac6fecee | 467 | const char *name; |
99ac48f5 | 468 | const struct file_operations *i_fop; |
7364af6a | 469 | umode_t mode; |
1da177e4 LT |
470 | }; |
471 | ||
1da177e4 | 472 | static struct inode * |
7364af6a | 473 | rpc_get_inode(struct super_block *sb, umode_t mode) |
1da177e4 LT |
474 | { |
475 | struct inode *inode = new_inode(sb); | |
476 | if (!inode) | |
477 | return NULL; | |
85fe4025 | 478 | inode->i_ino = get_next_ino(); |
1da177e4 | 479 | inode->i_mode = mode; |
1da177e4 | 480 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
89f0e4fe JP |
481 | switch (mode & S_IFMT) { |
482 | case S_IFDIR: | |
483 | inode->i_fop = &simple_dir_operations; | |
275448eb | 484 | inode->i_op = &simple_dir_inode_operations; |
89f0e4fe JP |
485 | inc_nlink(inode); |
486 | default: | |
487 | break; | |
1da177e4 LT |
488 | } |
489 | return inode; | |
490 | } | |
491 | ||
7589806e TM |
492 | static int __rpc_create_common(struct inode *dir, struct dentry *dentry, |
493 | umode_t mode, | |
494 | const struct file_operations *i_fop, | |
495 | void *private) | |
496 | { | |
497 | struct inode *inode; | |
498 | ||
beb0f0a9 | 499 | d_drop(dentry); |
7589806e TM |
500 | inode = rpc_get_inode(dir->i_sb, mode); |
501 | if (!inode) | |
502 | goto out_err; | |
503 | inode->i_ino = iunique(dir->i_sb, 100); | |
504 | if (i_fop) | |
505 | inode->i_fop = i_fop; | |
506 | if (private) | |
507 | rpc_inode_setowner(inode, private); | |
508 | d_add(dentry, inode); | |
509 | return 0; | |
510 | out_err: | |
1e903eda AV |
511 | printk(KERN_WARNING "%s: %s failed to allocate inode for dentry %pd\n", |
512 | __FILE__, __func__, dentry); | |
7589806e TM |
513 | dput(dentry); |
514 | return -ENOMEM; | |
515 | } | |
516 | ||
ac6fecee TM |
517 | static int __rpc_create(struct inode *dir, struct dentry *dentry, |
518 | umode_t mode, | |
519 | const struct file_operations *i_fop, | |
520 | void *private) | |
521 | { | |
522 | int err; | |
523 | ||
524 | err = __rpc_create_common(dir, dentry, S_IFREG | mode, i_fop, private); | |
525 | if (err) | |
526 | return err; | |
527 | fsnotify_create(dir, dentry); | |
528 | return 0; | |
529 | } | |
530 | ||
7589806e TM |
531 | static int __rpc_mkdir(struct inode *dir, struct dentry *dentry, |
532 | umode_t mode, | |
533 | const struct file_operations *i_fop, | |
534 | void *private) | |
535 | { | |
536 | int err; | |
537 | ||
538 | err = __rpc_create_common(dir, dentry, S_IFDIR | mode, i_fop, private); | |
539 | if (err) | |
540 | return err; | |
541 | inc_nlink(dir); | |
542 | fsnotify_mkdir(dir, dentry); | |
543 | return 0; | |
544 | } | |
545 | ||
ba9e0975 SK |
546 | static void |
547 | init_pipe(struct rpc_pipe *pipe) | |
548 | { | |
549 | pipe->nreaders = 0; | |
550 | pipe->nwriters = 0; | |
551 | INIT_LIST_HEAD(&pipe->in_upcall); | |
552 | INIT_LIST_HEAD(&pipe->in_downcall); | |
553 | INIT_LIST_HEAD(&pipe->pipe); | |
554 | pipe->pipelen = 0; | |
ba9e0975 SK |
555 | INIT_DELAYED_WORK(&pipe->queue_timeout, |
556 | rpc_timeout_upcall_queue); | |
557 | pipe->ops = NULL; | |
558 | spin_lock_init(&pipe->lock); | |
c239d83b SK |
559 | pipe->dentry = NULL; |
560 | } | |
ba9e0975 | 561 | |
c239d83b SK |
562 | void rpc_destroy_pipe_data(struct rpc_pipe *pipe) |
563 | { | |
564 | kfree(pipe); | |
ba9e0975 | 565 | } |
c239d83b | 566 | EXPORT_SYMBOL_GPL(rpc_destroy_pipe_data); |
ba9e0975 | 567 | |
c239d83b | 568 | struct rpc_pipe *rpc_mkpipe_data(const struct rpc_pipe_ops *ops, int flags) |
7589806e | 569 | { |
ba9e0975 | 570 | struct rpc_pipe *pipe; |
7589806e | 571 | |
ba9e0975 SK |
572 | pipe = kzalloc(sizeof(struct rpc_pipe), GFP_KERNEL); |
573 | if (!pipe) | |
c239d83b | 574 | return ERR_PTR(-ENOMEM); |
ba9e0975 | 575 | init_pipe(pipe); |
c239d83b SK |
576 | pipe->ops = ops; |
577 | pipe->flags = flags; | |
578 | return pipe; | |
579 | } | |
580 | EXPORT_SYMBOL_GPL(rpc_mkpipe_data); | |
581 | ||
582 | static int __rpc_mkpipe_dentry(struct inode *dir, struct dentry *dentry, | |
583 | umode_t mode, | |
584 | const struct file_operations *i_fop, | |
585 | void *private, | |
586 | struct rpc_pipe *pipe) | |
7589806e TM |
587 | { |
588 | struct rpc_inode *rpci; | |
589 | int err; | |
590 | ||
591 | err = __rpc_create_common(dir, dentry, S_IFIFO | mode, i_fop, private); | |
592 | if (err) | |
593 | return err; | |
594 | rpci = RPC_I(dentry->d_inode); | |
7589806e | 595 | rpci->private = private; |
ba9e0975 | 596 | rpci->pipe = pipe; |
7589806e TM |
597 | fsnotify_create(dir, dentry); |
598 | return 0; | |
599 | } | |
600 | ||
ac6fecee TM |
601 | static int __rpc_rmdir(struct inode *dir, struct dentry *dentry) |
602 | { | |
603 | int ret; | |
604 | ||
605 | dget(dentry); | |
606 | ret = simple_rmdir(dir, dentry); | |
607 | d_delete(dentry); | |
608 | dput(dentry); | |
609 | return ret; | |
610 | } | |
611 | ||
eee17325 SK |
612 | int rpc_rmdir(struct dentry *dentry) |
613 | { | |
614 | struct dentry *parent; | |
615 | struct inode *dir; | |
616 | int error; | |
617 | ||
618 | parent = dget_parent(dentry); | |
619 | dir = parent->d_inode; | |
620 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); | |
621 | error = __rpc_rmdir(dir, dentry); | |
622 | mutex_unlock(&dir->i_mutex); | |
623 | dput(parent); | |
624 | return error; | |
625 | } | |
626 | EXPORT_SYMBOL_GPL(rpc_rmdir); | |
627 | ||
810d90bc TM |
628 | static int __rpc_unlink(struct inode *dir, struct dentry *dentry) |
629 | { | |
630 | int ret; | |
631 | ||
632 | dget(dentry); | |
633 | ret = simple_unlink(dir, dentry); | |
634 | d_delete(dentry); | |
635 | dput(dentry); | |
636 | return ret; | |
637 | } | |
638 | ||
639 | static int __rpc_rmpipe(struct inode *dir, struct dentry *dentry) | |
640 | { | |
641 | struct inode *inode = dentry->d_inode; | |
810d90bc | 642 | |
810d90bc TM |
643 | rpc_close_pipes(inode); |
644 | return __rpc_unlink(dir, dentry); | |
645 | } | |
646 | ||
5bff0386 | 647 | static struct dentry *__rpc_lookup_create_exclusive(struct dentry *parent, |
d3db90b0 | 648 | const char *name) |
cfeaa4a3 | 649 | { |
d3db90b0 AV |
650 | struct qstr q = QSTR_INIT(name, strlen(name)); |
651 | struct dentry *dentry = d_hash_and_lookup(parent, &q); | |
cfeaa4a3 | 652 | if (!dentry) { |
d3db90b0 | 653 | dentry = d_alloc(parent, &q); |
5bff0386 SK |
654 | if (!dentry) |
655 | return ERR_PTR(-ENOMEM); | |
cfeaa4a3 | 656 | } |
76fa6665 | 657 | if (dentry->d_inode == NULL) |
cfeaa4a3 TM |
658 | return dentry; |
659 | dput(dentry); | |
660 | return ERR_PTR(-EEXIST); | |
661 | } | |
662 | ||
1da177e4 LT |
663 | /* |
664 | * FIXME: This probably has races. | |
665 | */ | |
ac6fecee TM |
666 | static void __rpc_depopulate(struct dentry *parent, |
667 | const struct rpc_filelist *files, | |
668 | int start, int eof) | |
1da177e4 LT |
669 | { |
670 | struct inode *dir = parent->d_inode; | |
ac6fecee TM |
671 | struct dentry *dentry; |
672 | struct qstr name; | |
673 | int i; | |
1da177e4 | 674 | |
ac6fecee TM |
675 | for (i = start; i < eof; i++) { |
676 | name.name = files[i].name; | |
677 | name.len = strlen(files[i].name); | |
d3db90b0 | 678 | dentry = d_hash_and_lookup(parent, &name); |
ac6fecee TM |
679 | |
680 | if (dentry == NULL) | |
62e1761c | 681 | continue; |
ac6fecee TM |
682 | if (dentry->d_inode == NULL) |
683 | goto next; | |
684 | switch (dentry->d_inode->i_mode & S_IFMT) { | |
685 | default: | |
686 | BUG(); | |
687 | case S_IFREG: | |
688 | __rpc_unlink(dir, dentry); | |
1da177e4 | 689 | break; |
ac6fecee TM |
690 | case S_IFDIR: |
691 | __rpc_rmdir(dir, dentry); | |
692 | } | |
693 | next: | |
694 | dput(dentry); | |
1da177e4 | 695 | } |
ac6fecee TM |
696 | } |
697 | ||
698 | static void rpc_depopulate(struct dentry *parent, | |
699 | const struct rpc_filelist *files, | |
700 | int start, int eof) | |
701 | { | |
702 | struct inode *dir = parent->d_inode; | |
703 | ||
704 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_CHILD); | |
705 | __rpc_depopulate(parent, files, start, eof); | |
1b1dcc1b | 706 | mutex_unlock(&dir->i_mutex); |
1da177e4 LT |
707 | } |
708 | ||
ac6fecee TM |
709 | static int rpc_populate(struct dentry *parent, |
710 | const struct rpc_filelist *files, | |
711 | int start, int eof, | |
712 | void *private) | |
1da177e4 | 713 | { |
ac6fecee | 714 | struct inode *dir = parent->d_inode; |
1da177e4 | 715 | struct dentry *dentry; |
ac6fecee | 716 | int i, err; |
1da177e4 | 717 | |
1b1dcc1b | 718 | mutex_lock(&dir->i_mutex); |
1da177e4 | 719 | for (i = start; i < eof; i++) { |
d3db90b0 | 720 | dentry = __rpc_lookup_create_exclusive(parent, files[i].name); |
ac6fecee TM |
721 | err = PTR_ERR(dentry); |
722 | if (IS_ERR(dentry)) | |
1da177e4 | 723 | goto out_bad; |
ac6fecee TM |
724 | switch (files[i].mode & S_IFMT) { |
725 | default: | |
726 | BUG(); | |
727 | case S_IFREG: | |
728 | err = __rpc_create(dir, dentry, | |
729 | files[i].mode, | |
730 | files[i].i_fop, | |
731 | private); | |
732 | break; | |
733 | case S_IFDIR: | |
734 | err = __rpc_mkdir(dir, dentry, | |
735 | files[i].mode, | |
736 | NULL, | |
737 | private); | |
1da177e4 | 738 | } |
ac6fecee TM |
739 | if (err != 0) |
740 | goto out_bad; | |
1da177e4 | 741 | } |
1b1dcc1b | 742 | mutex_unlock(&dir->i_mutex); |
1da177e4 LT |
743 | return 0; |
744 | out_bad: | |
ac6fecee | 745 | __rpc_depopulate(parent, files, start, eof); |
1b1dcc1b | 746 | mutex_unlock(&dir->i_mutex); |
1e903eda AV |
747 | printk(KERN_WARNING "%s: %s failed to populate directory %pd\n", |
748 | __FILE__, __func__, parent); | |
ac6fecee | 749 | return err; |
f134585a | 750 | } |
1da177e4 | 751 | |
e57aed77 | 752 | static struct dentry *rpc_mkdir_populate(struct dentry *parent, |
a95e691f | 753 | const char *name, umode_t mode, void *private, |
e57aed77 | 754 | int (*populate)(struct dentry *, void *), void *args_populate) |
f134585a | 755 | { |
f134585a | 756 | struct dentry *dentry; |
7d59d1e8 | 757 | struct inode *dir = parent->d_inode; |
f134585a TM |
758 | int error; |
759 | ||
7d59d1e8 TM |
760 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); |
761 | dentry = __rpc_lookup_create_exclusive(parent, name); | |
f134585a | 762 | if (IS_ERR(dentry)) |
7d59d1e8 TM |
763 | goto out; |
764 | error = __rpc_mkdir(dir, dentry, mode, NULL, private); | |
7589806e TM |
765 | if (error != 0) |
766 | goto out_err; | |
e57aed77 TM |
767 | if (populate != NULL) { |
768 | error = populate(dentry, args_populate); | |
769 | if (error) | |
770 | goto err_rmdir; | |
771 | } | |
f134585a | 772 | out: |
1b1dcc1b | 773 | mutex_unlock(&dir->i_mutex); |
5c3e985a | 774 | return dentry; |
ac6fecee | 775 | err_rmdir: |
f134585a | 776 | __rpc_rmdir(dir, dentry); |
7589806e | 777 | out_err: |
f134585a TM |
778 | dentry = ERR_PTR(error); |
779 | goto out; | |
1da177e4 LT |
780 | } |
781 | ||
e57aed77 TM |
782 | static int rpc_rmdir_depopulate(struct dentry *dentry, |
783 | void (*depopulate)(struct dentry *)) | |
1da177e4 | 784 | { |
dff02cc1 | 785 | struct dentry *parent; |
f134585a TM |
786 | struct inode *dir; |
787 | int error; | |
278c995c | 788 | |
dff02cc1 TM |
789 | parent = dget_parent(dentry); |
790 | dir = parent->d_inode; | |
c6573c29 | 791 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); |
e57aed77 TM |
792 | if (depopulate != NULL) |
793 | depopulate(dentry); | |
f134585a | 794 | error = __rpc_rmdir(dir, dentry); |
1b1dcc1b | 795 | mutex_unlock(&dir->i_mutex); |
dff02cc1 | 796 | dput(parent); |
f134585a | 797 | return error; |
1da177e4 LT |
798 | } |
799 | ||
93a44a75 BF |
800 | /** |
801 | * rpc_mkpipe - make an rpc_pipefs file for kernel<->userspace communication | |
802 | * @parent: dentry of directory to create new "pipe" in | |
803 | * @name: name of pipe | |
804 | * @private: private data to associate with the pipe, for the caller's use | |
bda14606 | 805 | * @pipe: &rpc_pipe containing input parameters |
93a44a75 BF |
806 | * |
807 | * Data is made available for userspace to read by calls to | |
808 | * rpc_queue_upcall(). The actual reads will result in calls to | |
809 | * @ops->upcall, which will be called with the file pointer, | |
810 | * message, and userspace buffer to copy to. | |
811 | * | |
812 | * Writes can come at any time, and do not necessarily have to be | |
813 | * responses to upcalls. They will result in calls to @msg->downcall. | |
814 | * | |
815 | * The @private argument passed here will be available to all these methods | |
496ad9aa | 816 | * from the file pointer, via RPC_I(file_inode(file))->private. |
93a44a75 | 817 | */ |
c239d83b SK |
818 | struct dentry *rpc_mkpipe_dentry(struct dentry *parent, const char *name, |
819 | void *private, struct rpc_pipe *pipe) | |
1da177e4 | 820 | { |
1da177e4 | 821 | struct dentry *dentry; |
7589806e | 822 | struct inode *dir = parent->d_inode; |
7364af6a | 823 | umode_t umode = S_IFIFO | S_IRUSR | S_IWUSR; |
7589806e | 824 | int err; |
7364af6a | 825 | |
c239d83b | 826 | if (pipe->ops->upcall == NULL) |
7364af6a | 827 | umode &= ~S_IRUGO; |
c239d83b | 828 | if (pipe->ops->downcall == NULL) |
7364af6a | 829 | umode &= ~S_IWUGO; |
1da177e4 | 830 | |
cfeaa4a3 | 831 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); |
d3db90b0 | 832 | dentry = __rpc_lookup_create_exclusive(parent, name); |
1da177e4 | 833 | if (IS_ERR(dentry)) |
cfeaa4a3 | 834 | goto out; |
c239d83b SK |
835 | err = __rpc_mkpipe_dentry(dir, dentry, umode, &rpc_pipe_fops, |
836 | private, pipe); | |
7589806e TM |
837 | if (err) |
838 | goto out_err; | |
f134585a | 839 | out: |
1b1dcc1b | 840 | mutex_unlock(&dir->i_mutex); |
5c3e985a | 841 | return dentry; |
7589806e TM |
842 | out_err: |
843 | dentry = ERR_PTR(err); | |
1e903eda AV |
844 | printk(KERN_WARNING "%s: %s() failed to create pipe %pd/%s (errno = %d)\n", |
845 | __FILE__, __func__, parent, name, | |
7589806e | 846 | err); |
f134585a | 847 | goto out; |
1da177e4 | 848 | } |
c239d83b | 849 | EXPORT_SYMBOL_GPL(rpc_mkpipe_dentry); |
1da177e4 | 850 | |
93a44a75 BF |
851 | /** |
852 | * rpc_unlink - remove a pipe | |
853 | * @dentry: dentry for the pipe, as returned from rpc_mkpipe | |
854 | * | |
855 | * After this call, lookups will no longer find the pipe, and any | |
856 | * attempts to read or write using preexisting opens of the pipe will | |
857 | * return -EPIPE. | |
858 | */ | |
f134585a | 859 | int |
5d67476f | 860 | rpc_unlink(struct dentry *dentry) |
1da177e4 | 861 | { |
5d67476f | 862 | struct dentry *parent; |
f134585a | 863 | struct inode *dir; |
5d67476f | 864 | int error = 0; |
1da177e4 | 865 | |
5d67476f TM |
866 | parent = dget_parent(dentry); |
867 | dir = parent->d_inode; | |
c6573c29 | 868 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); |
810d90bc | 869 | error = __rpc_rmpipe(dir, dentry); |
1b1dcc1b | 870 | mutex_unlock(&dir->i_mutex); |
5d67476f | 871 | dput(parent); |
f134585a | 872 | return error; |
1da177e4 | 873 | } |
468039ee | 874 | EXPORT_SYMBOL_GPL(rpc_unlink); |
1da177e4 | 875 | |
6739ffb7 TM |
876 | /** |
877 | * rpc_init_pipe_dir_head - initialise a struct rpc_pipe_dir_head | |
878 | * @pdh: pointer to struct rpc_pipe_dir_head | |
879 | */ | |
880 | void rpc_init_pipe_dir_head(struct rpc_pipe_dir_head *pdh) | |
881 | { | |
882 | INIT_LIST_HEAD(&pdh->pdh_entries); | |
883 | pdh->pdh_dentry = NULL; | |
884 | } | |
885 | EXPORT_SYMBOL_GPL(rpc_init_pipe_dir_head); | |
886 | ||
887 | /** | |
888 | * rpc_init_pipe_dir_object - initialise a struct rpc_pipe_dir_object | |
889 | * @pdo: pointer to struct rpc_pipe_dir_object | |
890 | * @pdo_ops: pointer to const struct rpc_pipe_dir_object_ops | |
891 | * @pdo_data: pointer to caller-defined data | |
892 | */ | |
893 | void rpc_init_pipe_dir_object(struct rpc_pipe_dir_object *pdo, | |
894 | const struct rpc_pipe_dir_object_ops *pdo_ops, | |
895 | void *pdo_data) | |
896 | { | |
897 | INIT_LIST_HEAD(&pdo->pdo_head); | |
898 | pdo->pdo_ops = pdo_ops; | |
899 | pdo->pdo_data = pdo_data; | |
900 | } | |
901 | EXPORT_SYMBOL_GPL(rpc_init_pipe_dir_object); | |
902 | ||
903 | static int | |
904 | rpc_add_pipe_dir_object_locked(struct net *net, | |
905 | struct rpc_pipe_dir_head *pdh, | |
906 | struct rpc_pipe_dir_object *pdo) | |
907 | { | |
908 | int ret = 0; | |
909 | ||
910 | if (pdh->pdh_dentry) | |
911 | ret = pdo->pdo_ops->create(pdh->pdh_dentry, pdo); | |
912 | if (ret == 0) | |
913 | list_add_tail(&pdo->pdo_head, &pdh->pdh_entries); | |
914 | return ret; | |
915 | } | |
916 | ||
917 | static void | |
918 | rpc_remove_pipe_dir_object_locked(struct net *net, | |
919 | struct rpc_pipe_dir_head *pdh, | |
920 | struct rpc_pipe_dir_object *pdo) | |
921 | { | |
922 | if (pdh->pdh_dentry) | |
923 | pdo->pdo_ops->destroy(pdh->pdh_dentry, pdo); | |
924 | list_del_init(&pdo->pdo_head); | |
925 | } | |
926 | ||
927 | /** | |
928 | * rpc_add_pipe_dir_object - associate a rpc_pipe_dir_object to a directory | |
929 | * @net: pointer to struct net | |
930 | * @pdh: pointer to struct rpc_pipe_dir_head | |
931 | * @pdo: pointer to struct rpc_pipe_dir_object | |
932 | * | |
933 | */ | |
934 | int | |
935 | rpc_add_pipe_dir_object(struct net *net, | |
936 | struct rpc_pipe_dir_head *pdh, | |
937 | struct rpc_pipe_dir_object *pdo) | |
938 | { | |
939 | int ret = 0; | |
940 | ||
941 | if (list_empty(&pdo->pdo_head)) { | |
942 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
943 | ||
944 | mutex_lock(&sn->pipefs_sb_lock); | |
945 | ret = rpc_add_pipe_dir_object_locked(net, pdh, pdo); | |
946 | mutex_unlock(&sn->pipefs_sb_lock); | |
947 | } | |
948 | return ret; | |
949 | } | |
950 | EXPORT_SYMBOL_GPL(rpc_add_pipe_dir_object); | |
951 | ||
952 | /** | |
953 | * rpc_remove_pipe_dir_object - remove a rpc_pipe_dir_object from a directory | |
954 | * @net: pointer to struct net | |
955 | * @pdh: pointer to struct rpc_pipe_dir_head | |
956 | * @pdo: pointer to struct rpc_pipe_dir_object | |
957 | * | |
958 | */ | |
959 | void | |
960 | rpc_remove_pipe_dir_object(struct net *net, | |
961 | struct rpc_pipe_dir_head *pdh, | |
962 | struct rpc_pipe_dir_object *pdo) | |
963 | { | |
964 | if (!list_empty(&pdo->pdo_head)) { | |
965 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
966 | ||
967 | mutex_lock(&sn->pipefs_sb_lock); | |
968 | rpc_remove_pipe_dir_object_locked(net, pdh, pdo); | |
969 | mutex_unlock(&sn->pipefs_sb_lock); | |
970 | } | |
971 | } | |
972 | EXPORT_SYMBOL_GPL(rpc_remove_pipe_dir_object); | |
973 | ||
298fc355 TM |
974 | /** |
975 | * rpc_find_or_alloc_pipe_dir_object | |
976 | * @net: pointer to struct net | |
977 | * @pdh: pointer to struct rpc_pipe_dir_head | |
978 | * @match: match struct rpc_pipe_dir_object to data | |
979 | * @alloc: allocate a new struct rpc_pipe_dir_object | |
980 | * @data: user defined data for match() and alloc() | |
981 | * | |
982 | */ | |
983 | struct rpc_pipe_dir_object * | |
984 | rpc_find_or_alloc_pipe_dir_object(struct net *net, | |
985 | struct rpc_pipe_dir_head *pdh, | |
986 | int (*match)(struct rpc_pipe_dir_object *, void *), | |
987 | struct rpc_pipe_dir_object *(*alloc)(void *), | |
988 | void *data) | |
989 | { | |
990 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
991 | struct rpc_pipe_dir_object *pdo; | |
992 | ||
993 | mutex_lock(&sn->pipefs_sb_lock); | |
994 | list_for_each_entry(pdo, &pdh->pdh_entries, pdo_head) { | |
995 | if (!match(pdo, data)) | |
996 | continue; | |
997 | goto out; | |
998 | } | |
999 | pdo = alloc(data); | |
1000 | if (!pdo) | |
1001 | goto out; | |
1002 | rpc_add_pipe_dir_object_locked(net, pdh, pdo); | |
1003 | out: | |
1004 | mutex_unlock(&sn->pipefs_sb_lock); | |
1005 | return pdo; | |
1006 | } | |
1007 | EXPORT_SYMBOL_GPL(rpc_find_or_alloc_pipe_dir_object); | |
1008 | ||
6739ffb7 TM |
1009 | static void |
1010 | rpc_create_pipe_dir_objects(struct rpc_pipe_dir_head *pdh) | |
1011 | { | |
1012 | struct rpc_pipe_dir_object *pdo; | |
1013 | struct dentry *dir = pdh->pdh_dentry; | |
1014 | ||
1015 | list_for_each_entry(pdo, &pdh->pdh_entries, pdo_head) | |
1016 | pdo->pdo_ops->create(dir, pdo); | |
1017 | } | |
1018 | ||
1019 | static void | |
1020 | rpc_destroy_pipe_dir_objects(struct rpc_pipe_dir_head *pdh) | |
1021 | { | |
1022 | struct rpc_pipe_dir_object *pdo; | |
1023 | struct dentry *dir = pdh->pdh_dentry; | |
1024 | ||
1025 | list_for_each_entry(pdo, &pdh->pdh_entries, pdo_head) | |
1026 | pdo->pdo_ops->destroy(dir, pdo); | |
1027 | } | |
1028 | ||
e57aed77 TM |
1029 | enum { |
1030 | RPCAUTH_info, | |
1031 | RPCAUTH_EOF | |
1032 | }; | |
1033 | ||
1034 | static const struct rpc_filelist authfiles[] = { | |
1035 | [RPCAUTH_info] = { | |
1036 | .name = "info", | |
1037 | .i_fop = &rpc_info_operations, | |
1038 | .mode = S_IFREG | S_IRUSR, | |
1039 | }, | |
1040 | }; | |
1041 | ||
1042 | static int rpc_clntdir_populate(struct dentry *dentry, void *private) | |
1043 | { | |
1044 | return rpc_populate(dentry, | |
1045 | authfiles, RPCAUTH_info, RPCAUTH_EOF, | |
1046 | private); | |
1047 | } | |
1048 | ||
1049 | static void rpc_clntdir_depopulate(struct dentry *dentry) | |
1050 | { | |
1051 | rpc_depopulate(dentry, authfiles, RPCAUTH_info, RPCAUTH_EOF); | |
1052 | } | |
1053 | ||
7d59d1e8 TM |
1054 | /** |
1055 | * rpc_create_client_dir - Create a new rpc_client directory in rpc_pipefs | |
a95e691f AV |
1056 | * @dentry: the parent of new directory |
1057 | * @name: the name of new directory | |
7d59d1e8 TM |
1058 | * @rpc_client: rpc client to associate with this directory |
1059 | * | |
1060 | * This creates a directory at the given @path associated with | |
1061 | * @rpc_clnt, which will contain a file named "info" with some basic | |
1062 | * information about the client, together with any "pipes" that may | |
1063 | * later be created using rpc_mkpipe(). | |
1064 | */ | |
23ac6581 | 1065 | struct dentry *rpc_create_client_dir(struct dentry *dentry, |
a95e691f | 1066 | const char *name, |
e57aed77 TM |
1067 | struct rpc_clnt *rpc_client) |
1068 | { | |
6739ffb7 TM |
1069 | struct dentry *ret; |
1070 | ||
1071 | ret = rpc_mkdir_populate(dentry, name, S_IRUGO | S_IXUGO, NULL, | |
e57aed77 | 1072 | rpc_clntdir_populate, rpc_client); |
6739ffb7 TM |
1073 | if (!IS_ERR(ret)) { |
1074 | rpc_client->cl_pipedir_objects.pdh_dentry = ret; | |
1075 | rpc_create_pipe_dir_objects(&rpc_client->cl_pipedir_objects); | |
1076 | } | |
1077 | return ret; | |
e57aed77 TM |
1078 | } |
1079 | ||
1080 | /** | |
1081 | * rpc_remove_client_dir - Remove a directory created with rpc_create_client_dir() | |
6739ffb7 | 1082 | * @rpc_client: rpc_client for the pipe |
e57aed77 | 1083 | */ |
c36dcfe1 | 1084 | int rpc_remove_client_dir(struct rpc_clnt *rpc_client) |
7d59d1e8 | 1085 | { |
c36dcfe1 TM |
1086 | struct dentry *dentry = rpc_client->cl_pipedir_objects.pdh_dentry; |
1087 | ||
1088 | if (dentry == NULL) | |
1089 | return 0; | |
1090 | rpc_destroy_pipe_dir_objects(&rpc_client->cl_pipedir_objects); | |
1091 | rpc_client->cl_pipedir_objects.pdh_dentry = NULL; | |
e57aed77 | 1092 | return rpc_rmdir_depopulate(dentry, rpc_clntdir_depopulate); |
7d59d1e8 TM |
1093 | } |
1094 | ||
8854e82d TM |
1095 | static const struct rpc_filelist cache_pipefs_files[3] = { |
1096 | [0] = { | |
1097 | .name = "channel", | |
1098 | .i_fop = &cache_file_operations_pipefs, | |
96c61cbd | 1099 | .mode = S_IFREG|S_IRUSR|S_IWUSR, |
8854e82d TM |
1100 | }, |
1101 | [1] = { | |
1102 | .name = "content", | |
1103 | .i_fop = &content_file_operations_pipefs, | |
1104 | .mode = S_IFREG|S_IRUSR, | |
1105 | }, | |
1106 | [2] = { | |
1107 | .name = "flush", | |
1108 | .i_fop = &cache_flush_operations_pipefs, | |
1109 | .mode = S_IFREG|S_IRUSR|S_IWUSR, | |
1110 | }, | |
1111 | }; | |
1112 | ||
1113 | static int rpc_cachedir_populate(struct dentry *dentry, void *private) | |
1114 | { | |
1115 | return rpc_populate(dentry, | |
1116 | cache_pipefs_files, 0, 3, | |
1117 | private); | |
1118 | } | |
1119 | ||
1120 | static void rpc_cachedir_depopulate(struct dentry *dentry) | |
1121 | { | |
1122 | rpc_depopulate(dentry, cache_pipefs_files, 0, 3); | |
1123 | } | |
1124 | ||
a95e691f | 1125 | struct dentry *rpc_create_cache_dir(struct dentry *parent, const char *name, |
64f1426f | 1126 | umode_t umode, struct cache_detail *cd) |
8854e82d TM |
1127 | { |
1128 | return rpc_mkdir_populate(parent, name, umode, NULL, | |
1129 | rpc_cachedir_populate, cd); | |
1130 | } | |
1131 | ||
1132 | void rpc_remove_cache_dir(struct dentry *dentry) | |
1133 | { | |
1134 | rpc_rmdir_depopulate(dentry, rpc_cachedir_depopulate); | |
1135 | } | |
1136 | ||
1da177e4 LT |
1137 | /* |
1138 | * populate the filesystem | |
1139 | */ | |
b87221de | 1140 | static const struct super_operations s_ops = { |
1da177e4 LT |
1141 | .alloc_inode = rpc_alloc_inode, |
1142 | .destroy_inode = rpc_destroy_inode, | |
1143 | .statfs = simple_statfs, | |
1144 | }; | |
1145 | ||
1146 | #define RPCAUTH_GSSMAGIC 0x67596969 | |
1147 | ||
bb156749 TM |
1148 | /* |
1149 | * We have a single directory with 1 node in it. | |
1150 | */ | |
1151 | enum { | |
1152 | RPCAUTH_lockd, | |
1153 | RPCAUTH_mount, | |
1154 | RPCAUTH_nfs, | |
1155 | RPCAUTH_portmap, | |
1156 | RPCAUTH_statd, | |
1157 | RPCAUTH_nfsd4_cb, | |
e571cbf1 | 1158 | RPCAUTH_cache, |
b3537c35 | 1159 | RPCAUTH_nfsd, |
4b9a445e | 1160 | RPCAUTH_gssd, |
bb156749 TM |
1161 | RPCAUTH_RootEOF |
1162 | }; | |
1163 | ||
1164 | static const struct rpc_filelist files[] = { | |
1165 | [RPCAUTH_lockd] = { | |
1166 | .name = "lockd", | |
1167 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
1168 | }, | |
1169 | [RPCAUTH_mount] = { | |
1170 | .name = "mount", | |
1171 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
1172 | }, | |
1173 | [RPCAUTH_nfs] = { | |
1174 | .name = "nfs", | |
1175 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
1176 | }, | |
1177 | [RPCAUTH_portmap] = { | |
1178 | .name = "portmap", | |
1179 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
1180 | }, | |
1181 | [RPCAUTH_statd] = { | |
1182 | .name = "statd", | |
1183 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
1184 | }, | |
1185 | [RPCAUTH_nfsd4_cb] = { | |
1186 | .name = "nfsd4_cb", | |
1187 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
1188 | }, | |
e571cbf1 TM |
1189 | [RPCAUTH_cache] = { |
1190 | .name = "cache", | |
1191 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
1192 | }, | |
b3537c35 JL |
1193 | [RPCAUTH_nfsd] = { |
1194 | .name = "nfsd", | |
1195 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
1196 | }, | |
4b9a445e JL |
1197 | [RPCAUTH_gssd] = { |
1198 | .name = "gssd", | |
1199 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
1200 | }, | |
bb156749 TM |
1201 | }; |
1202 | ||
432eb1a5 SK |
1203 | /* |
1204 | * This call can be used only in RPC pipefs mount notification hooks. | |
1205 | */ | |
1206 | struct dentry *rpc_d_lookup_sb(const struct super_block *sb, | |
1207 | const unsigned char *dir_name) | |
1208 | { | |
26fe5750 | 1209 | struct qstr dir = QSTR_INIT(dir_name, strlen(dir_name)); |
d3db90b0 | 1210 | return d_hash_and_lookup(sb->s_root, &dir); |
432eb1a5 SK |
1211 | } |
1212 | EXPORT_SYMBOL_GPL(rpc_d_lookup_sb); | |
1213 | ||
4b9a445e | 1214 | int rpc_pipefs_init_net(struct net *net) |
c21a588f SK |
1215 | { |
1216 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
1217 | ||
4b9a445e JL |
1218 | sn->gssd_dummy = rpc_mkpipe_data(&gssd_dummy_pipe_ops, 0); |
1219 | if (IS_ERR(sn->gssd_dummy)) | |
1220 | return PTR_ERR(sn->gssd_dummy); | |
1221 | ||
c21a588f | 1222 | mutex_init(&sn->pipefs_sb_lock); |
2aed8b47 | 1223 | sn->pipe_version = -1; |
4b9a445e JL |
1224 | return 0; |
1225 | } | |
1226 | ||
1227 | void rpc_pipefs_exit_net(struct net *net) | |
1228 | { | |
1229 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
1230 | ||
1231 | rpc_destroy_pipe_data(sn->gssd_dummy); | |
c21a588f SK |
1232 | } |
1233 | ||
1234 | /* | |
1235 | * This call will be used for per network namespace operations calls. | |
1236 | * Note: Function will be returned with pipefs_sb_lock taken if superblock was | |
1237 | * found. This lock have to be released by rpc_put_sb_net() when all operations | |
1238 | * will be completed. | |
1239 | */ | |
1240 | struct super_block *rpc_get_sb_net(const struct net *net) | |
1241 | { | |
1242 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
1243 | ||
1244 | mutex_lock(&sn->pipefs_sb_lock); | |
1245 | if (sn->pipefs_sb) | |
1246 | return sn->pipefs_sb; | |
1247 | mutex_unlock(&sn->pipefs_sb_lock); | |
1248 | return NULL; | |
1249 | } | |
1250 | EXPORT_SYMBOL_GPL(rpc_get_sb_net); | |
1251 | ||
1252 | void rpc_put_sb_net(const struct net *net) | |
1253 | { | |
1254 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
1255 | ||
749386e9 | 1256 | WARN_ON(sn->pipefs_sb == NULL); |
c21a588f SK |
1257 | mutex_unlock(&sn->pipefs_sb_lock); |
1258 | } | |
1259 | EXPORT_SYMBOL_GPL(rpc_put_sb_net); | |
1260 | ||
4b9a445e JL |
1261 | static const struct rpc_filelist gssd_dummy_clnt_dir[] = { |
1262 | [0] = { | |
1263 | .name = "clntXX", | |
1264 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
1265 | }, | |
1266 | }; | |
1267 | ||
1268 | static ssize_t | |
1269 | dummy_downcall(struct file *filp, const char __user *src, size_t len) | |
1270 | { | |
1271 | return -EINVAL; | |
1272 | } | |
1273 | ||
1274 | static const struct rpc_pipe_ops gssd_dummy_pipe_ops = { | |
1275 | .upcall = rpc_pipe_generic_upcall, | |
1276 | .downcall = dummy_downcall, | |
1277 | }; | |
1278 | ||
e2f0c83a JL |
1279 | /* |
1280 | * Here we present a bogus "info" file to keep rpc.gssd happy. We don't expect | |
1281 | * that it will ever use this info to handle an upcall, but rpc.gssd expects | |
1282 | * that this file will be there and have a certain format. | |
1283 | */ | |
1284 | static int | |
1285 | rpc_show_dummy_info(struct seq_file *m, void *v) | |
1286 | { | |
1287 | seq_printf(m, "RPC server: %s\n", utsname()->nodename); | |
1288 | seq_printf(m, "service: foo (1) version 0\n"); | |
1289 | seq_printf(m, "address: 127.0.0.1\n"); | |
1290 | seq_printf(m, "protocol: tcp\n"); | |
1291 | seq_printf(m, "port: 0\n"); | |
1292 | return 0; | |
1293 | } | |
1294 | ||
1295 | static int | |
1296 | rpc_dummy_info_open(struct inode *inode, struct file *file) | |
1297 | { | |
1298 | return single_open(file, rpc_show_dummy_info, NULL); | |
1299 | } | |
1300 | ||
1301 | static const struct file_operations rpc_dummy_info_operations = { | |
1302 | .owner = THIS_MODULE, | |
1303 | .open = rpc_dummy_info_open, | |
1304 | .read = seq_read, | |
1305 | .llseek = seq_lseek, | |
1306 | .release = single_release, | |
1307 | }; | |
1308 | ||
1309 | static const struct rpc_filelist gssd_dummy_info_file[] = { | |
1310 | [0] = { | |
1311 | .name = "info", | |
1312 | .i_fop = &rpc_dummy_info_operations, | |
1313 | .mode = S_IFREG | S_IRUSR, | |
1314 | }, | |
1315 | }; | |
1316 | ||
4b9a445e JL |
1317 | /** |
1318 | * rpc_gssd_dummy_populate - create a dummy gssd pipe | |
1319 | * @root: root of the rpc_pipefs filesystem | |
1320 | * @pipe_data: pipe data created when netns is initialized | |
1321 | * | |
1322 | * Create a dummy set of directories and a pipe that gssd can hold open to | |
1323 | * indicate that it is up and running. | |
1324 | */ | |
1325 | static struct dentry * | |
1326 | rpc_gssd_dummy_populate(struct dentry *root, struct rpc_pipe *pipe_data) | |
1327 | { | |
1328 | int ret = 0; | |
1329 | struct dentry *gssd_dentry; | |
1330 | struct dentry *clnt_dentry = NULL; | |
1331 | struct dentry *pipe_dentry = NULL; | |
1332 | struct qstr q = QSTR_INIT(files[RPCAUTH_gssd].name, | |
1333 | strlen(files[RPCAUTH_gssd].name)); | |
1334 | ||
1335 | /* We should never get this far if "gssd" doesn't exist */ | |
1336 | gssd_dentry = d_hash_and_lookup(root, &q); | |
1337 | if (!gssd_dentry) | |
1338 | return ERR_PTR(-ENOENT); | |
1339 | ||
1340 | ret = rpc_populate(gssd_dentry, gssd_dummy_clnt_dir, 0, 1, NULL); | |
1341 | if (ret) { | |
1342 | pipe_dentry = ERR_PTR(ret); | |
1343 | goto out; | |
1344 | } | |
1345 | ||
1346 | q.name = gssd_dummy_clnt_dir[0].name; | |
1347 | q.len = strlen(gssd_dummy_clnt_dir[0].name); | |
1348 | clnt_dentry = d_hash_and_lookup(gssd_dentry, &q); | |
1349 | if (!clnt_dentry) { | |
1350 | pipe_dentry = ERR_PTR(-ENOENT); | |
1351 | goto out; | |
1352 | } | |
1353 | ||
e2f0c83a JL |
1354 | ret = rpc_populate(clnt_dentry, gssd_dummy_info_file, 0, 1, NULL); |
1355 | if (ret) { | |
1356 | __rpc_depopulate(gssd_dentry, gssd_dummy_clnt_dir, 0, 1); | |
1357 | pipe_dentry = ERR_PTR(ret); | |
1358 | goto out; | |
1359 | } | |
1360 | ||
4b9a445e | 1361 | pipe_dentry = rpc_mkpipe_dentry(clnt_dentry, "gssd", NULL, pipe_data); |
e2f0c83a JL |
1362 | if (IS_ERR(pipe_dentry)) { |
1363 | __rpc_depopulate(clnt_dentry, gssd_dummy_info_file, 0, 1); | |
3396f92f | 1364 | __rpc_depopulate(gssd_dentry, gssd_dummy_clnt_dir, 0, 1); |
e2f0c83a | 1365 | } |
4b9a445e JL |
1366 | out: |
1367 | dput(clnt_dentry); | |
1368 | dput(gssd_dentry); | |
1369 | return pipe_dentry; | |
1370 | } | |
1371 | ||
23e66ba9 JL |
1372 | static void |
1373 | rpc_gssd_dummy_depopulate(struct dentry *pipe_dentry) | |
1374 | { | |
1375 | struct dentry *clnt_dir = pipe_dentry->d_parent; | |
1376 | struct dentry *gssd_dir = clnt_dir->d_parent; | |
1377 | ||
1378 | __rpc_rmpipe(clnt_dir->d_inode, pipe_dentry); | |
1379 | __rpc_depopulate(clnt_dir, gssd_dummy_info_file, 0, 1); | |
1380 | __rpc_depopulate(gssd_dir, gssd_dummy_clnt_dir, 0, 1); | |
1381 | dput(pipe_dentry); | |
1382 | } | |
1383 | ||
1da177e4 LT |
1384 | static int |
1385 | rpc_fill_super(struct super_block *sb, void *data, int silent) | |
1386 | { | |
1387 | struct inode *inode; | |
4b9a445e | 1388 | struct dentry *root, *gssd_dentry; |
38b0da75 | 1389 | struct net *net = data; |
90c4e829 | 1390 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
2d00131a | 1391 | int err; |
1da177e4 LT |
1392 | |
1393 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
1394 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
1395 | sb->s_magic = RPCAUTH_GSSMAGIC; | |
1396 | sb->s_op = &s_ops; | |
b26d4cd3 | 1397 | sb->s_d_op = &simple_dentry_operations; |
1da177e4 LT |
1398 | sb->s_time_gran = 1; |
1399 | ||
7e450b4e | 1400 | inode = rpc_get_inode(sb, S_IFDIR | S_IRUGO | S_IXUGO); |
48fde701 AV |
1401 | sb->s_root = root = d_make_root(inode); |
1402 | if (!root) | |
1da177e4 | 1403 | return -ENOMEM; |
ac6fecee | 1404 | if (rpc_populate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF, NULL)) |
fc7bed8c | 1405 | return -ENOMEM; |
4b9a445e JL |
1406 | |
1407 | gssd_dentry = rpc_gssd_dummy_populate(root, sn->gssd_dummy); | |
1408 | if (IS_ERR(gssd_dentry)) { | |
1409 | __rpc_depopulate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF); | |
1410 | return PTR_ERR(gssd_dentry); | |
1411 | } | |
1412 | ||
d8af9bc1 CL |
1413 | dprintk("RPC: sending pipefs MOUNT notification for net %p%s\n", |
1414 | net, NET_NAME(net)); | |
38481605 | 1415 | mutex_lock(&sn->pipefs_sb_lock); |
37629b57 | 1416 | sn->pipefs_sb = sb; |
2d00131a SK |
1417 | err = blocking_notifier_call_chain(&rpc_pipefs_notifier_list, |
1418 | RPC_PIPEFS_MOUNT, | |
1419 | sb); | |
1420 | if (err) | |
1421 | goto err_depopulate; | |
021c68de | 1422 | sb->s_fs_info = get_net(net); |
38481605 | 1423 | mutex_unlock(&sn->pipefs_sb_lock); |
1da177e4 | 1424 | return 0; |
2d00131a SK |
1425 | |
1426 | err_depopulate: | |
23e66ba9 | 1427 | rpc_gssd_dummy_depopulate(gssd_dentry); |
2d00131a SK |
1428 | blocking_notifier_call_chain(&rpc_pipefs_notifier_list, |
1429 | RPC_PIPEFS_UMOUNT, | |
1430 | sb); | |
37629b57 | 1431 | sn->pipefs_sb = NULL; |
2d00131a | 1432 | __rpc_depopulate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF); |
38481605 | 1433 | mutex_unlock(&sn->pipefs_sb_lock); |
2d00131a | 1434 | return err; |
1da177e4 LT |
1435 | } |
1436 | ||
89f84243 JL |
1437 | bool |
1438 | gssd_running(struct net *net) | |
1439 | { | |
1440 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
1441 | struct rpc_pipe *pipe = sn->gssd_dummy; | |
1442 | ||
1443 | return pipe->nreaders || pipe->nwriters; | |
1444 | } | |
1445 | EXPORT_SYMBOL_GPL(gssd_running); | |
1446 | ||
fc14f2fe AV |
1447 | static struct dentry * |
1448 | rpc_mount(struct file_system_type *fs_type, | |
1449 | int flags, const char *dev_name, void *data) | |
1da177e4 | 1450 | { |
38b0da75 | 1451 | return mount_ns(fs_type, flags, current->nsproxy->net_ns, rpc_fill_super); |
1da177e4 LT |
1452 | } |
1453 | ||
09acfea5 | 1454 | static void rpc_kill_sb(struct super_block *sb) |
021c68de SK |
1455 | { |
1456 | struct net *net = sb->s_fs_info; | |
90c4e829 | 1457 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
021c68de | 1458 | |
c21a588f | 1459 | mutex_lock(&sn->pipefs_sb_lock); |
642fe4d0 TM |
1460 | if (sn->pipefs_sb != sb) { |
1461 | mutex_unlock(&sn->pipefs_sb_lock); | |
1462 | goto out; | |
1463 | } | |
90c4e829 | 1464 | sn->pipefs_sb = NULL; |
d8af9bc1 CL |
1465 | dprintk("RPC: sending pipefs UMOUNT notification for net %p%s\n", |
1466 | net, NET_NAME(net)); | |
2d00131a SK |
1467 | blocking_notifier_call_chain(&rpc_pipefs_notifier_list, |
1468 | RPC_PIPEFS_UMOUNT, | |
1469 | sb); | |
adb6fa7f | 1470 | mutex_unlock(&sn->pipefs_sb_lock); |
642fe4d0 TM |
1471 | put_net(net); |
1472 | out: | |
021c68de | 1473 | kill_litter_super(sb); |
1da177e4 LT |
1474 | } |
1475 | ||
1476 | static struct file_system_type rpc_pipe_fs_type = { | |
1477 | .owner = THIS_MODULE, | |
1478 | .name = "rpc_pipefs", | |
fc14f2fe | 1479 | .mount = rpc_mount, |
021c68de | 1480 | .kill_sb = rpc_kill_sb, |
1da177e4 | 1481 | }; |
7f78e035 | 1482 | MODULE_ALIAS_FS("rpc_pipefs"); |
fa7614dd | 1483 | MODULE_ALIAS("rpc_pipefs"); |
1da177e4 LT |
1484 | |
1485 | static void | |
51cc5068 | 1486 | init_once(void *foo) |
1da177e4 LT |
1487 | { |
1488 | struct rpc_inode *rpci = (struct rpc_inode *) foo; | |
1489 | ||
a35afb83 CL |
1490 | inode_init_once(&rpci->vfs_inode); |
1491 | rpci->private = NULL; | |
ba9e0975 | 1492 | rpci->pipe = NULL; |
a35afb83 | 1493 | init_waitqueue_head(&rpci->waitq); |
1da177e4 LT |
1494 | } |
1495 | ||
1496 | int register_rpc_pipefs(void) | |
1497 | { | |
5bd5f581 AM |
1498 | int err; |
1499 | ||
1da177e4 | 1500 | rpc_inode_cachep = kmem_cache_create("rpc_inode_cache", |
fffb60f9 PJ |
1501 | sizeof(struct rpc_inode), |
1502 | 0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| | |
1503 | SLAB_MEM_SPREAD), | |
20c2df83 | 1504 | init_once); |
1da177e4 LT |
1505 | if (!rpc_inode_cachep) |
1506 | return -ENOMEM; | |
80df9d20 SK |
1507 | err = rpc_clients_notifier_register(); |
1508 | if (err) | |
1509 | goto err_notifier; | |
5bd5f581 | 1510 | err = register_filesystem(&rpc_pipe_fs_type); |
80df9d20 SK |
1511 | if (err) |
1512 | goto err_register; | |
1da177e4 | 1513 | return 0; |
80df9d20 SK |
1514 | |
1515 | err_register: | |
1516 | rpc_clients_notifier_unregister(); | |
1517 | err_notifier: | |
1518 | kmem_cache_destroy(rpc_inode_cachep); | |
1519 | return err; | |
1da177e4 LT |
1520 | } |
1521 | ||
1522 | void unregister_rpc_pipefs(void) | |
1523 | { | |
80df9d20 | 1524 | rpc_clients_notifier_unregister(); |
1a1d92c1 | 1525 | kmem_cache_destroy(rpc_inode_cachep); |
1da177e4 LT |
1526 | unregister_filesystem(&rpc_pipe_fs_type); |
1527 | } |