Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * net/sunrpc/rpc_pipe.c | |
3 | * | |
4 | * Userland/kernel interface for rpcauth_gss. | |
5 | * Code shamelessly plagiarized from fs/nfsd/nfsctl.c | |
d51fe1be | 6 | * and fs/sysfs/inode.c |
1da177e4 LT |
7 | * |
8 | * Copyright (c) 2002, Trond Myklebust <trond.myklebust@fys.uio.no> | |
9 | * | |
10 | */ | |
1da177e4 LT |
11 | #include <linux/module.h> |
12 | #include <linux/slab.h> | |
13 | #include <linux/string.h> | |
14 | #include <linux/pagemap.h> | |
15 | #include <linux/mount.h> | |
16 | #include <linux/namei.h> | |
50e437d5 | 17 | #include <linux/fsnotify.h> |
1da177e4 LT |
18 | #include <linux/kernel.h> |
19 | ||
20 | #include <asm/ioctls.h> | |
21 | #include <linux/fs.h> | |
22 | #include <linux/poll.h> | |
23 | #include <linux/wait.h> | |
24 | #include <linux/seq_file.h> | |
25 | ||
26 | #include <linux/sunrpc/clnt.h> | |
27 | #include <linux/workqueue.h> | |
28 | #include <linux/sunrpc/rpc_pipe_fs.h> | |
8854e82d | 29 | #include <linux/sunrpc/cache.h> |
021c68de | 30 | #include <linux/nsproxy.h> |
2d00131a | 31 | #include <linux/notifier.h> |
021c68de SK |
32 | |
33 | #include "netns.h" | |
2d00131a | 34 | #include "sunrpc.h" |
1da177e4 | 35 | |
efc46bf2 SK |
36 | #define RPCDBG_FACILITY RPCDBG_DEBUG |
37 | ||
38 | #define NET_NAME(net) ((net == &init_net) ? " (init_net)" : "") | |
39 | ||
fc14f2fe | 40 | static struct vfsmount *rpc_mnt __read_mostly; |
1da177e4 LT |
41 | static int rpc_mount_count; |
42 | ||
43 | static struct file_system_type rpc_pipe_fs_type; | |
44 | ||
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 | { | |
54 | return blocking_notifier_chain_cond_register(&rpc_pipefs_notifier_list, nb); | |
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 | ||
ba9e0975 | 64 | static void rpc_purge_list(struct rpc_pipe *pipe, 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)); |
ba9e0975 | 77 | wake_up(&pipe->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 *); |
1da177e4 | 87 | |
ba9e0975 SK |
88 | spin_lock(&pipe->lock); |
89 | if (pipe->ops == NULL) { | |
90 | spin_unlock(&pipe->lock); | |
9842ef35 TM |
91 | return; |
92 | } | |
ba9e0975 SK |
93 | destroy_msg = pipe->ops->destroy_msg; |
94 | if (pipe->nreaders == 0) { | |
95 | list_splice_init(&pipe->pipe, &free_list); | |
96 | pipe->pipelen = 0; | |
9842ef35 | 97 | } |
ba9e0975 SK |
98 | spin_unlock(&pipe->lock); |
99 | rpc_purge_list(pipe, &free_list, destroy_msg, -ETIMEDOUT); | |
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 |
93a44a75 BF |
124 | * @inode: inode of upcall pipe on which to queue given message |
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; |
1da177e4 | 136 | |
d0fe13ba SK |
137 | spin_lock(&pipe->lock); |
138 | if (pipe->ops == NULL) | |
6070fe6f | 139 | goto out; |
d0fe13ba SK |
140 | if (pipe->nreaders) { |
141 | list_add_tail(&msg->list, &pipe->pipe); | |
142 | pipe->pipelen += msg->len; | |
6070fe6f | 143 | res = 0; |
d0fe13ba SK |
144 | } else if (pipe->flags & RPC_PIPE_WAIT_FOR_OPEN) { |
145 | if (list_empty(&pipe->pipe)) | |
24c5d9d7 | 146 | queue_delayed_work(rpciod_workqueue, |
d0fe13ba | 147 | &pipe->queue_timeout, |
1da177e4 | 148 | RPC_UPCALL_TIMEOUT); |
d0fe13ba SK |
149 | list_add_tail(&msg->list, &pipe->pipe); |
150 | pipe->pipelen += msg->len; | |
6070fe6f TM |
151 | res = 0; |
152 | } | |
153 | out: | |
d0fe13ba SK |
154 | spin_unlock(&pipe->lock); |
155 | wake_up(&pipe->waitq); | |
1da177e4 LT |
156 | return res; |
157 | } | |
468039ee | 158 | EXPORT_SYMBOL_GPL(rpc_queue_upcall); |
1da177e4 | 159 | |
6070fe6f TM |
160 | static inline void |
161 | rpc_inode_setowner(struct inode *inode, void *private) | |
162 | { | |
163 | RPC_I(inode)->private = private; | |
164 | } | |
165 | ||
1da177e4 LT |
166 | static void |
167 | rpc_close_pipes(struct inode *inode) | |
168 | { | |
ba9e0975 | 169 | struct rpc_pipe *pipe = RPC_I(inode)->pipe; |
b693ba4a | 170 | const struct rpc_pipe_ops *ops; |
e712804a | 171 | int need_release; |
1da177e4 | 172 | |
1b1dcc1b | 173 | mutex_lock(&inode->i_mutex); |
ba9e0975 | 174 | ops = pipe->ops; |
9842ef35 TM |
175 | if (ops != NULL) { |
176 | LIST_HEAD(free_list); | |
ba9e0975 SK |
177 | spin_lock(&pipe->lock); |
178 | need_release = pipe->nreaders != 0 || pipe->nwriters != 0; | |
179 | pipe->nreaders = 0; | |
180 | list_splice_init(&pipe->in_upcall, &free_list); | |
181 | list_splice_init(&pipe->pipe, &free_list); | |
182 | pipe->pipelen = 0; | |
183 | pipe->ops = NULL; | |
184 | spin_unlock(&pipe->lock); | |
185 | rpc_purge_list(pipe, &free_list, ops->destroy_msg, -EPIPE); | |
186 | pipe->nwriters = 0; | |
e712804a | 187 | if (need_release && ops->release_pipe) |
9842ef35 | 188 | ops->release_pipe(inode); |
ba9e0975 | 189 | cancel_delayed_work_sync(&pipe->queue_timeout); |
1da177e4 | 190 | } |
6070fe6f | 191 | rpc_inode_setowner(inode, NULL); |
1b1dcc1b | 192 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
193 | } |
194 | ||
1da177e4 LT |
195 | static struct inode * |
196 | rpc_alloc_inode(struct super_block *sb) | |
197 | { | |
198 | struct rpc_inode *rpci; | |
e94b1766 | 199 | rpci = (struct rpc_inode *)kmem_cache_alloc(rpc_inode_cachep, GFP_KERNEL); |
1da177e4 LT |
200 | if (!rpci) |
201 | return NULL; | |
202 | return &rpci->vfs_inode; | |
203 | } | |
204 | ||
205 | static void | |
fa0d7e3d | 206 | rpc_i_callback(struct rcu_head *head) |
1da177e4 | 207 | { |
fa0d7e3d | 208 | struct inode *inode = container_of(head, struct inode, i_rcu); |
ba9e0975 | 209 | kfree(RPC_I(inode)->pipe); |
1da177e4 LT |
210 | kmem_cache_free(rpc_inode_cachep, RPC_I(inode)); |
211 | } | |
212 | ||
fa0d7e3d NP |
213 | static void |
214 | rpc_destroy_inode(struct inode *inode) | |
215 | { | |
216 | call_rcu(&inode->i_rcu, rpc_i_callback); | |
217 | } | |
218 | ||
1da177e4 LT |
219 | static int |
220 | rpc_pipe_open(struct inode *inode, struct file *filp) | |
221 | { | |
d0fe13ba | 222 | struct rpc_pipe *pipe = RPC_I(inode)->pipe; |
c3810608 | 223 | int first_open; |
1da177e4 LT |
224 | int res = -ENXIO; |
225 | ||
1b1dcc1b | 226 | mutex_lock(&inode->i_mutex); |
d0fe13ba | 227 | if (pipe->ops == NULL) |
c3810608 | 228 | goto out; |
d0fe13ba SK |
229 | first_open = pipe->nreaders == 0 && pipe->nwriters == 0; |
230 | if (first_open && pipe->ops->open_pipe) { | |
231 | res = pipe->ops->open_pipe(inode); | |
c3810608 BF |
232 | if (res) |
233 | goto out; | |
1da177e4 | 234 | } |
c3810608 | 235 | if (filp->f_mode & FMODE_READ) |
d0fe13ba | 236 | pipe->nreaders++; |
c3810608 | 237 | if (filp->f_mode & FMODE_WRITE) |
d0fe13ba | 238 | pipe->nwriters++; |
c3810608 BF |
239 | res = 0; |
240 | out: | |
1b1dcc1b | 241 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
242 | return res; |
243 | } | |
244 | ||
245 | static int | |
246 | rpc_pipe_release(struct inode *inode, struct file *filp) | |
247 | { | |
ba9e0975 | 248 | struct rpc_pipe *pipe = RPC_I(inode)->pipe; |
1da177e4 | 249 | struct rpc_pipe_msg *msg; |
e712804a | 250 | int last_close; |
1da177e4 | 251 | |
1b1dcc1b | 252 | mutex_lock(&inode->i_mutex); |
ba9e0975 | 253 | if (pipe->ops == 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); | |
273 | rpc_purge_list(pipe, &free_list, | |
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 | { | |
303b46bb | 288 | struct inode *inode = filp->f_path.dentry->d_inode; |
d0fe13ba | 289 | struct rpc_pipe *pipe = RPC_I(inode)->pipe; |
1da177e4 LT |
290 | struct rpc_pipe_msg *msg; |
291 | int res = 0; | |
292 | ||
1b1dcc1b | 293 | mutex_lock(&inode->i_mutex); |
d0fe13ba | 294 | if (pipe->ops == NULL) { |
1da177e4 LT |
295 | res = -EPIPE; |
296 | goto out_unlock; | |
297 | } | |
298 | msg = filp->private_data; | |
299 | if (msg == NULL) { | |
d0fe13ba SK |
300 | spin_lock(&pipe->lock); |
301 | if (!list_empty(&pipe->pipe)) { | |
302 | msg = list_entry(pipe->pipe.next, | |
1da177e4 LT |
303 | struct rpc_pipe_msg, |
304 | list); | |
d0fe13ba SK |
305 | list_move(&msg->list, &pipe->in_upcall); |
306 | pipe->pipelen -= msg->len; | |
1da177e4 LT |
307 | filp->private_data = msg; |
308 | msg->copied = 0; | |
309 | } | |
d0fe13ba | 310 | spin_unlock(&pipe->lock); |
1da177e4 LT |
311 | if (msg == NULL) |
312 | goto out_unlock; | |
313 | } | |
314 | /* NOTE: it is up to the callback to update msg->copied */ | |
d0fe13ba | 315 | res = pipe->ops->upcall(filp, msg, buf, len); |
1da177e4 LT |
316 | if (res < 0 || msg->len == msg->copied) { |
317 | filp->private_data = NULL; | |
d0fe13ba | 318 | spin_lock(&pipe->lock); |
5a67657a | 319 | list_del_init(&msg->list); |
d0fe13ba SK |
320 | spin_unlock(&pipe->lock); |
321 | pipe->ops->destroy_msg(msg); | |
1da177e4 LT |
322 | } |
323 | out_unlock: | |
1b1dcc1b | 324 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
325 | return res; |
326 | } | |
327 | ||
328 | static ssize_t | |
329 | rpc_pipe_write(struct file *filp, const char __user *buf, size_t len, loff_t *offset) | |
330 | { | |
303b46bb | 331 | struct inode *inode = filp->f_path.dentry->d_inode; |
d0fe13ba | 332 | struct rpc_pipe *pipe = RPC_I(inode)->pipe; |
1da177e4 LT |
333 | int res; |
334 | ||
1b1dcc1b | 335 | mutex_lock(&inode->i_mutex); |
1da177e4 | 336 | res = -EPIPE; |
d0fe13ba SK |
337 | if (pipe->ops != NULL) |
338 | res = 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 | { | |
d0fe13ba | 346 | struct rpc_pipe *pipe = RPC_I(filp->f_path.dentry->d_inode)->pipe; |
1da177e4 LT |
347 | unsigned int mask = 0; |
348 | ||
d0fe13ba | 349 | poll_wait(filp, &pipe->waitq, wait); |
1da177e4 LT |
350 | |
351 | mask = POLLOUT | POLLWRNORM; | |
d0fe13ba | 352 | if (pipe->ops == NULL) |
1da177e4 | 353 | mask |= POLLERR | POLLHUP; |
d0fe13ba | 354 | if (filp->private_data || !list_empty(&pipe->pipe)) |
1da177e4 LT |
355 | mask |= POLLIN | POLLRDNORM; |
356 | return mask; | |
357 | } | |
358 | ||
a6f8dbc6 AB |
359 | static long |
360 | rpc_pipe_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) | |
1da177e4 | 361 | { |
a6f8dbc6 | 362 | struct inode *inode = filp->f_path.dentry->d_inode; |
d0fe13ba | 363 | struct rpc_pipe *pipe = RPC_I(inode)->pipe; |
1da177e4 LT |
364 | int len; |
365 | ||
366 | switch (cmd) { | |
367 | case FIONREAD: | |
d0fe13ba SK |
368 | spin_lock(&pipe->lock); |
369 | if (pipe->ops == NULL) { | |
370 | spin_unlock(&pipe->lock); | |
1da177e4 | 371 | return -EPIPE; |
a6f8dbc6 | 372 | } |
d0fe13ba | 373 | len = pipe->pipelen; |
1da177e4 LT |
374 | if (filp->private_data) { |
375 | struct rpc_pipe_msg *msg; | |
655b5bb4 | 376 | msg = filp->private_data; |
1da177e4 LT |
377 | len += msg->len - msg->copied; |
378 | } | |
d0fe13ba | 379 | spin_unlock(&pipe->lock); |
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 | ||
402 | seq_printf(m, "RPC server: %s\n", clnt->cl_server); | |
403 | seq_printf(m, "service: %s (%d) version %d\n", clnt->cl_protname, | |
404 | clnt->cl_prog, clnt->cl_vers); | |
e7f78657 CL |
405 | seq_printf(m, "address: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_ADDR)); |
406 | seq_printf(m, "protocol: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PROTO)); | |
bf19aace | 407 | seq_printf(m, "port: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PORT)); |
1da177e4 LT |
408 | return 0; |
409 | } | |
410 | ||
411 | static int | |
412 | rpc_info_open(struct inode *inode, struct file *file) | |
413 | { | |
006abe88 | 414 | struct rpc_clnt *clnt = NULL; |
1da177e4 LT |
415 | int ret = single_open(file, rpc_show_info, NULL); |
416 | ||
417 | if (!ret) { | |
418 | struct seq_file *m = file->private_data; | |
006abe88 TM |
419 | |
420 | spin_lock(&file->f_path.dentry->d_lock); | |
421 | if (!d_unhashed(file->f_path.dentry)) | |
422 | clnt = RPC_I(inode)->private; | |
423 | if (clnt != NULL && atomic_inc_not_zero(&clnt->cl_count)) { | |
424 | spin_unlock(&file->f_path.dentry->d_lock); | |
1da177e4 LT |
425 | m->private = clnt; |
426 | } else { | |
006abe88 | 427 | spin_unlock(&file->f_path.dentry->d_lock); |
1da177e4 LT |
428 | single_release(inode, file); |
429 | ret = -EINVAL; | |
430 | } | |
1da177e4 LT |
431 | } |
432 | return ret; | |
433 | } | |
434 | ||
435 | static int | |
436 | rpc_info_release(struct inode *inode, struct file *file) | |
437 | { | |
438 | struct seq_file *m = file->private_data; | |
439 | struct rpc_clnt *clnt = (struct rpc_clnt *)m->private; | |
440 | ||
441 | if (clnt) | |
442 | rpc_release_client(clnt); | |
443 | return single_release(inode, file); | |
444 | } | |
445 | ||
da7071d7 | 446 | static const struct file_operations rpc_info_operations = { |
1da177e4 LT |
447 | .owner = THIS_MODULE, |
448 | .open = rpc_info_open, | |
449 | .read = seq_read, | |
450 | .llseek = seq_lseek, | |
451 | .release = rpc_info_release, | |
452 | }; | |
453 | ||
454 | ||
1da177e4 LT |
455 | /* |
456 | * Description of fs contents. | |
457 | */ | |
458 | struct rpc_filelist { | |
ac6fecee | 459 | const char *name; |
99ac48f5 | 460 | const struct file_operations *i_fop; |
7364af6a | 461 | umode_t mode; |
1da177e4 LT |
462 | }; |
463 | ||
54281548 | 464 | struct vfsmount *rpc_get_mount(void) |
1da177e4 | 465 | { |
54281548 TM |
466 | int err; |
467 | ||
fc14f2fe | 468 | err = simple_pin_fs(&rpc_pipe_fs_type, &rpc_mnt, &rpc_mount_count); |
54281548 TM |
469 | if (err != 0) |
470 | return ERR_PTR(err); | |
fc14f2fe | 471 | return rpc_mnt; |
1da177e4 | 472 | } |
e571cbf1 | 473 | EXPORT_SYMBOL_GPL(rpc_get_mount); |
1da177e4 | 474 | |
54281548 | 475 | void rpc_put_mount(void) |
1da177e4 | 476 | { |
fc14f2fe | 477 | simple_release_fs(&rpc_mnt, &rpc_mount_count); |
1da177e4 | 478 | } |
e571cbf1 | 479 | EXPORT_SYMBOL_GPL(rpc_put_mount); |
1da177e4 | 480 | |
fe15ce44 | 481 | static int rpc_delete_dentry(const struct dentry *dentry) |
62e1761c TM |
482 | { |
483 | return 1; | |
484 | } | |
485 | ||
3ba13d17 | 486 | static const struct dentry_operations rpc_dentry_operations = { |
62e1761c TM |
487 | .d_delete = rpc_delete_dentry, |
488 | }; | |
489 | ||
1da177e4 | 490 | static struct inode * |
7364af6a | 491 | rpc_get_inode(struct super_block *sb, umode_t mode) |
1da177e4 LT |
492 | { |
493 | struct inode *inode = new_inode(sb); | |
494 | if (!inode) | |
495 | return NULL; | |
85fe4025 | 496 | inode->i_ino = get_next_ino(); |
1da177e4 | 497 | inode->i_mode = mode; |
1da177e4 | 498 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
89f0e4fe JP |
499 | switch (mode & S_IFMT) { |
500 | case S_IFDIR: | |
501 | inode->i_fop = &simple_dir_operations; | |
502 | inode->i_op = &simple_dir_inode_operations; | |
503 | inc_nlink(inode); | |
504 | default: | |
505 | break; | |
1da177e4 LT |
506 | } |
507 | return inode; | |
508 | } | |
509 | ||
7589806e TM |
510 | static int __rpc_create_common(struct inode *dir, struct dentry *dentry, |
511 | umode_t mode, | |
512 | const struct file_operations *i_fop, | |
513 | void *private) | |
514 | { | |
515 | struct inode *inode; | |
516 | ||
beb0f0a9 | 517 | d_drop(dentry); |
7589806e TM |
518 | inode = rpc_get_inode(dir->i_sb, mode); |
519 | if (!inode) | |
520 | goto out_err; | |
521 | inode->i_ino = iunique(dir->i_sb, 100); | |
522 | if (i_fop) | |
523 | inode->i_fop = i_fop; | |
524 | if (private) | |
525 | rpc_inode_setowner(inode, private); | |
526 | d_add(dentry, inode); | |
527 | return 0; | |
528 | out_err: | |
529 | printk(KERN_WARNING "%s: %s failed to allocate inode for dentry %s\n", | |
530 | __FILE__, __func__, dentry->d_name.name); | |
531 | dput(dentry); | |
532 | return -ENOMEM; | |
533 | } | |
534 | ||
ac6fecee TM |
535 | static int __rpc_create(struct inode *dir, struct dentry *dentry, |
536 | umode_t mode, | |
537 | const struct file_operations *i_fop, | |
538 | void *private) | |
539 | { | |
540 | int err; | |
541 | ||
542 | err = __rpc_create_common(dir, dentry, S_IFREG | mode, i_fop, private); | |
543 | if (err) | |
544 | return err; | |
545 | fsnotify_create(dir, dentry); | |
546 | return 0; | |
547 | } | |
548 | ||
7589806e TM |
549 | static int __rpc_mkdir(struct inode *dir, struct dentry *dentry, |
550 | umode_t mode, | |
551 | const struct file_operations *i_fop, | |
552 | void *private) | |
553 | { | |
554 | int err; | |
555 | ||
556 | err = __rpc_create_common(dir, dentry, S_IFDIR | mode, i_fop, private); | |
557 | if (err) | |
558 | return err; | |
559 | inc_nlink(dir); | |
560 | fsnotify_mkdir(dir, dentry); | |
561 | return 0; | |
562 | } | |
563 | ||
ba9e0975 SK |
564 | static void |
565 | init_pipe(struct rpc_pipe *pipe) | |
566 | { | |
567 | pipe->nreaders = 0; | |
568 | pipe->nwriters = 0; | |
569 | INIT_LIST_HEAD(&pipe->in_upcall); | |
570 | INIT_LIST_HEAD(&pipe->in_downcall); | |
571 | INIT_LIST_HEAD(&pipe->pipe); | |
572 | pipe->pipelen = 0; | |
573 | init_waitqueue_head(&pipe->waitq); | |
574 | INIT_DELAYED_WORK(&pipe->queue_timeout, | |
575 | rpc_timeout_upcall_queue); | |
576 | pipe->ops = NULL; | |
577 | spin_lock_init(&pipe->lock); | |
578 | ||
579 | } | |
580 | ||
7589806e TM |
581 | static int __rpc_mkpipe(struct inode *dir, struct dentry *dentry, |
582 | umode_t mode, | |
583 | const struct file_operations *i_fop, | |
584 | void *private, | |
585 | const struct rpc_pipe_ops *ops, | |
586 | int flags) | |
587 | { | |
ba9e0975 | 588 | struct rpc_pipe *pipe; |
7589806e TM |
589 | struct rpc_inode *rpci; |
590 | int err; | |
591 | ||
ba9e0975 SK |
592 | pipe = kzalloc(sizeof(struct rpc_pipe), GFP_KERNEL); |
593 | if (!pipe) | |
594 | return -ENOMEM; | |
595 | init_pipe(pipe); | |
7589806e | 596 | err = __rpc_create_common(dir, dentry, S_IFIFO | mode, i_fop, private); |
ba9e0975 SK |
597 | if (err) { |
598 | kfree(pipe); | |
7589806e | 599 | return err; |
ba9e0975 | 600 | } |
7589806e | 601 | rpci = RPC_I(dentry->d_inode); |
7589806e | 602 | rpci->private = private; |
ba9e0975 SK |
603 | rpci->pipe = pipe; |
604 | rpci->pipe->flags = flags; | |
605 | rpci->pipe->ops = ops; | |
7589806e TM |
606 | fsnotify_create(dir, dentry); |
607 | return 0; | |
608 | } | |
609 | ||
ac6fecee TM |
610 | static int __rpc_rmdir(struct inode *dir, struct dentry *dentry) |
611 | { | |
612 | int ret; | |
613 | ||
614 | dget(dentry); | |
615 | ret = simple_rmdir(dir, dentry); | |
616 | d_delete(dentry); | |
617 | dput(dentry); | |
618 | return ret; | |
619 | } | |
620 | ||
810d90bc TM |
621 | static int __rpc_unlink(struct inode *dir, struct dentry *dentry) |
622 | { | |
623 | int ret; | |
624 | ||
625 | dget(dentry); | |
626 | ret = simple_unlink(dir, dentry); | |
627 | d_delete(dentry); | |
628 | dput(dentry); | |
629 | return ret; | |
630 | } | |
631 | ||
632 | static int __rpc_rmpipe(struct inode *dir, struct dentry *dentry) | |
633 | { | |
634 | struct inode *inode = dentry->d_inode; | |
810d90bc | 635 | |
810d90bc TM |
636 | rpc_close_pipes(inode); |
637 | return __rpc_unlink(dir, dentry); | |
638 | } | |
639 | ||
5bff0386 | 640 | static struct dentry *__rpc_lookup_create_exclusive(struct dentry *parent, |
cfeaa4a3 TM |
641 | struct qstr *name) |
642 | { | |
643 | struct dentry *dentry; | |
644 | ||
645 | dentry = d_lookup(parent, name); | |
646 | if (!dentry) { | |
647 | dentry = d_alloc(parent, name); | |
5bff0386 SK |
648 | if (!dentry) |
649 | return ERR_PTR(-ENOMEM); | |
cfeaa4a3 | 650 | } |
5bff0386 | 651 | if (dentry->d_inode == NULL) { |
fb045adb | 652 | d_set_d_op(dentry, &rpc_dentry_operations); |
cfeaa4a3 | 653 | return dentry; |
5bff0386 | 654 | } |
cfeaa4a3 TM |
655 | dput(dentry); |
656 | return ERR_PTR(-EEXIST); | |
657 | } | |
658 | ||
1da177e4 LT |
659 | /* |
660 | * FIXME: This probably has races. | |
661 | */ | |
ac6fecee TM |
662 | static void __rpc_depopulate(struct dentry *parent, |
663 | const struct rpc_filelist *files, | |
664 | int start, int eof) | |
1da177e4 LT |
665 | { |
666 | struct inode *dir = parent->d_inode; | |
ac6fecee TM |
667 | struct dentry *dentry; |
668 | struct qstr name; | |
669 | int i; | |
1da177e4 | 670 | |
ac6fecee TM |
671 | for (i = start; i < eof; i++) { |
672 | name.name = files[i].name; | |
673 | name.len = strlen(files[i].name); | |
674 | name.hash = full_name_hash(name.name, name.len); | |
675 | dentry = d_lookup(parent, &name); | |
676 | ||
677 | if (dentry == NULL) | |
62e1761c | 678 | continue; |
ac6fecee TM |
679 | if (dentry->d_inode == NULL) |
680 | goto next; | |
681 | switch (dentry->d_inode->i_mode & S_IFMT) { | |
682 | default: | |
683 | BUG(); | |
684 | case S_IFREG: | |
685 | __rpc_unlink(dir, dentry); | |
1da177e4 | 686 | break; |
ac6fecee TM |
687 | case S_IFDIR: |
688 | __rpc_rmdir(dir, dentry); | |
689 | } | |
690 | next: | |
691 | dput(dentry); | |
1da177e4 | 692 | } |
ac6fecee TM |
693 | } |
694 | ||
695 | static void rpc_depopulate(struct dentry *parent, | |
696 | const struct rpc_filelist *files, | |
697 | int start, int eof) | |
698 | { | |
699 | struct inode *dir = parent->d_inode; | |
700 | ||
701 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_CHILD); | |
702 | __rpc_depopulate(parent, files, start, eof); | |
1b1dcc1b | 703 | mutex_unlock(&dir->i_mutex); |
1da177e4 LT |
704 | } |
705 | ||
ac6fecee TM |
706 | static int rpc_populate(struct dentry *parent, |
707 | const struct rpc_filelist *files, | |
708 | int start, int eof, | |
709 | void *private) | |
1da177e4 | 710 | { |
ac6fecee | 711 | struct inode *dir = parent->d_inode; |
1da177e4 | 712 | struct dentry *dentry; |
ac6fecee | 713 | int i, err; |
1da177e4 | 714 | |
1b1dcc1b | 715 | mutex_lock(&dir->i_mutex); |
1da177e4 | 716 | for (i = start; i < eof; i++) { |
ac6fecee TM |
717 | struct qstr q; |
718 | ||
719 | q.name = files[i].name; | |
720 | q.len = strlen(files[i].name); | |
721 | q.hash = full_name_hash(q.name, q.len); | |
722 | dentry = __rpc_lookup_create_exclusive(parent, &q); | |
723 | err = PTR_ERR(dentry); | |
724 | if (IS_ERR(dentry)) | |
1da177e4 | 725 | goto out_bad; |
ac6fecee TM |
726 | switch (files[i].mode & S_IFMT) { |
727 | default: | |
728 | BUG(); | |
729 | case S_IFREG: | |
730 | err = __rpc_create(dir, dentry, | |
731 | files[i].mode, | |
732 | files[i].i_fop, | |
733 | private); | |
734 | break; | |
735 | case S_IFDIR: | |
736 | err = __rpc_mkdir(dir, dentry, | |
737 | files[i].mode, | |
738 | NULL, | |
739 | private); | |
1da177e4 | 740 | } |
ac6fecee TM |
741 | if (err != 0) |
742 | goto out_bad; | |
1da177e4 | 743 | } |
1b1dcc1b | 744 | mutex_unlock(&dir->i_mutex); |
1da177e4 LT |
745 | return 0; |
746 | out_bad: | |
ac6fecee | 747 | __rpc_depopulate(parent, files, start, eof); |
1b1dcc1b | 748 | mutex_unlock(&dir->i_mutex); |
1da177e4 | 749 | printk(KERN_WARNING "%s: %s failed to populate directory %s\n", |
0dc47877 | 750 | __FILE__, __func__, parent->d_name.name); |
ac6fecee | 751 | return err; |
f134585a | 752 | } |
1da177e4 | 753 | |
e57aed77 TM |
754 | static struct dentry *rpc_mkdir_populate(struct dentry *parent, |
755 | struct qstr *name, umode_t mode, void *private, | |
756 | int (*populate)(struct dentry *, void *), void *args_populate) | |
f134585a | 757 | { |
f134585a | 758 | struct dentry *dentry; |
7d59d1e8 | 759 | struct inode *dir = parent->d_inode; |
f134585a TM |
760 | int error; |
761 | ||
7d59d1e8 TM |
762 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); |
763 | dentry = __rpc_lookup_create_exclusive(parent, name); | |
f134585a | 764 | if (IS_ERR(dentry)) |
7d59d1e8 TM |
765 | goto out; |
766 | error = __rpc_mkdir(dir, dentry, mode, NULL, private); | |
7589806e TM |
767 | if (error != 0) |
768 | goto out_err; | |
e57aed77 TM |
769 | if (populate != NULL) { |
770 | error = populate(dentry, args_populate); | |
771 | if (error) | |
772 | goto err_rmdir; | |
773 | } | |
f134585a | 774 | out: |
1b1dcc1b | 775 | mutex_unlock(&dir->i_mutex); |
5c3e985a | 776 | return dentry; |
ac6fecee | 777 | err_rmdir: |
f134585a | 778 | __rpc_rmdir(dir, dentry); |
7589806e | 779 | out_err: |
f134585a TM |
780 | dentry = ERR_PTR(error); |
781 | goto out; | |
1da177e4 LT |
782 | } |
783 | ||
e57aed77 TM |
784 | static int rpc_rmdir_depopulate(struct dentry *dentry, |
785 | void (*depopulate)(struct dentry *)) | |
1da177e4 | 786 | { |
dff02cc1 | 787 | struct dentry *parent; |
f134585a TM |
788 | struct inode *dir; |
789 | int error; | |
278c995c | 790 | |
dff02cc1 TM |
791 | parent = dget_parent(dentry); |
792 | dir = parent->d_inode; | |
c6573c29 | 793 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); |
e57aed77 TM |
794 | if (depopulate != NULL) |
795 | depopulate(dentry); | |
f134585a | 796 | error = __rpc_rmdir(dir, dentry); |
1b1dcc1b | 797 | mutex_unlock(&dir->i_mutex); |
dff02cc1 | 798 | dput(parent); |
f134585a | 799 | return error; |
1da177e4 LT |
800 | } |
801 | ||
93a44a75 BF |
802 | /** |
803 | * rpc_mkpipe - make an rpc_pipefs file for kernel<->userspace communication | |
804 | * @parent: dentry of directory to create new "pipe" in | |
805 | * @name: name of pipe | |
806 | * @private: private data to associate with the pipe, for the caller's use | |
807 | * @ops: operations defining the behavior of the pipe: upcall, downcall, | |
c3810608 | 808 | * release_pipe, open_pipe, and destroy_msg. |
d0fe13ba | 809 | * @flags: rpc_pipe flags |
93a44a75 BF |
810 | * |
811 | * Data is made available for userspace to read by calls to | |
812 | * rpc_queue_upcall(). The actual reads will result in calls to | |
813 | * @ops->upcall, which will be called with the file pointer, | |
814 | * message, and userspace buffer to copy to. | |
815 | * | |
816 | * Writes can come at any time, and do not necessarily have to be | |
817 | * responses to upcalls. They will result in calls to @msg->downcall. | |
818 | * | |
819 | * The @private argument passed here will be available to all these methods | |
820 | * from the file pointer, via RPC_I(file->f_dentry->d_inode)->private. | |
821 | */ | |
b693ba4a TM |
822 | struct dentry *rpc_mkpipe(struct dentry *parent, const char *name, |
823 | void *private, const struct rpc_pipe_ops *ops, | |
824 | int flags) | |
1da177e4 | 825 | { |
1da177e4 | 826 | struct dentry *dentry; |
7589806e | 827 | struct inode *dir = parent->d_inode; |
7364af6a | 828 | umode_t umode = S_IFIFO | S_IRUSR | S_IWUSR; |
cfeaa4a3 | 829 | struct qstr q; |
7589806e | 830 | int err; |
7364af6a TM |
831 | |
832 | if (ops->upcall == NULL) | |
833 | umode &= ~S_IRUGO; | |
834 | if (ops->downcall == NULL) | |
835 | umode &= ~S_IWUGO; | |
1da177e4 | 836 | |
cfeaa4a3 TM |
837 | q.name = name; |
838 | q.len = strlen(name); | |
839 | q.hash = full_name_hash(q.name, q.len), | |
840 | ||
841 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); | |
5bff0386 | 842 | dentry = __rpc_lookup_create_exclusive(parent, &q); |
1da177e4 | 843 | if (IS_ERR(dentry)) |
cfeaa4a3 | 844 | goto out; |
7589806e | 845 | err = __rpc_mkpipe(dir, dentry, umode, &rpc_pipe_fops, |
810d90bc | 846 | private, ops, flags); |
7589806e TM |
847 | if (err) |
848 | goto out_err; | |
f134585a | 849 | out: |
1b1dcc1b | 850 | mutex_unlock(&dir->i_mutex); |
5c3e985a | 851 | return dentry; |
7589806e TM |
852 | out_err: |
853 | dentry = ERR_PTR(err); | |
158998b6 | 854 | printk(KERN_WARNING "%s: %s() failed to create pipe %s/%s (errno = %d)\n", |
0dc47877 | 855 | __FILE__, __func__, parent->d_name.name, name, |
7589806e | 856 | err); |
f134585a | 857 | goto out; |
1da177e4 | 858 | } |
468039ee | 859 | EXPORT_SYMBOL_GPL(rpc_mkpipe); |
1da177e4 | 860 | |
93a44a75 BF |
861 | /** |
862 | * rpc_unlink - remove a pipe | |
863 | * @dentry: dentry for the pipe, as returned from rpc_mkpipe | |
864 | * | |
865 | * After this call, lookups will no longer find the pipe, and any | |
866 | * attempts to read or write using preexisting opens of the pipe will | |
867 | * return -EPIPE. | |
868 | */ | |
f134585a | 869 | int |
5d67476f | 870 | rpc_unlink(struct dentry *dentry) |
1da177e4 | 871 | { |
5d67476f | 872 | struct dentry *parent; |
f134585a | 873 | struct inode *dir; |
5d67476f | 874 | int error = 0; |
1da177e4 | 875 | |
5d67476f TM |
876 | parent = dget_parent(dentry); |
877 | dir = parent->d_inode; | |
c6573c29 | 878 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); |
810d90bc | 879 | error = __rpc_rmpipe(dir, dentry); |
1b1dcc1b | 880 | mutex_unlock(&dir->i_mutex); |
5d67476f | 881 | dput(parent); |
f134585a | 882 | return error; |
1da177e4 | 883 | } |
468039ee | 884 | EXPORT_SYMBOL_GPL(rpc_unlink); |
1da177e4 | 885 | |
e57aed77 TM |
886 | enum { |
887 | RPCAUTH_info, | |
888 | RPCAUTH_EOF | |
889 | }; | |
890 | ||
891 | static const struct rpc_filelist authfiles[] = { | |
892 | [RPCAUTH_info] = { | |
893 | .name = "info", | |
894 | .i_fop = &rpc_info_operations, | |
895 | .mode = S_IFREG | S_IRUSR, | |
896 | }, | |
897 | }; | |
898 | ||
899 | static int rpc_clntdir_populate(struct dentry *dentry, void *private) | |
900 | { | |
901 | return rpc_populate(dentry, | |
902 | authfiles, RPCAUTH_info, RPCAUTH_EOF, | |
903 | private); | |
904 | } | |
905 | ||
906 | static void rpc_clntdir_depopulate(struct dentry *dentry) | |
907 | { | |
908 | rpc_depopulate(dentry, authfiles, RPCAUTH_info, RPCAUTH_EOF); | |
909 | } | |
910 | ||
7d59d1e8 TM |
911 | /** |
912 | * rpc_create_client_dir - Create a new rpc_client directory in rpc_pipefs | |
4111d4fd RD |
913 | * @dentry: dentry from the rpc_pipefs root to the new directory |
914 | * @name: &struct qstr for the name | |
7d59d1e8 TM |
915 | * @rpc_client: rpc client to associate with this directory |
916 | * | |
917 | * This creates a directory at the given @path associated with | |
918 | * @rpc_clnt, which will contain a file named "info" with some basic | |
919 | * information about the client, together with any "pipes" that may | |
920 | * later be created using rpc_mkpipe(). | |
921 | */ | |
23ac6581 | 922 | struct dentry *rpc_create_client_dir(struct dentry *dentry, |
e57aed77 TM |
923 | struct qstr *name, |
924 | struct rpc_clnt *rpc_client) | |
925 | { | |
926 | return rpc_mkdir_populate(dentry, name, S_IRUGO | S_IXUGO, NULL, | |
927 | rpc_clntdir_populate, rpc_client); | |
928 | } | |
929 | ||
930 | /** | |
931 | * rpc_remove_client_dir - Remove a directory created with rpc_create_client_dir() | |
932 | * @dentry: directory to remove | |
933 | */ | |
934 | int rpc_remove_client_dir(struct dentry *dentry) | |
7d59d1e8 | 935 | { |
e57aed77 | 936 | return rpc_rmdir_depopulate(dentry, rpc_clntdir_depopulate); |
7d59d1e8 TM |
937 | } |
938 | ||
8854e82d TM |
939 | static const struct rpc_filelist cache_pipefs_files[3] = { |
940 | [0] = { | |
941 | .name = "channel", | |
942 | .i_fop = &cache_file_operations_pipefs, | |
96c61cbd | 943 | .mode = S_IFREG|S_IRUSR|S_IWUSR, |
8854e82d TM |
944 | }, |
945 | [1] = { | |
946 | .name = "content", | |
947 | .i_fop = &content_file_operations_pipefs, | |
948 | .mode = S_IFREG|S_IRUSR, | |
949 | }, | |
950 | [2] = { | |
951 | .name = "flush", | |
952 | .i_fop = &cache_flush_operations_pipefs, | |
953 | .mode = S_IFREG|S_IRUSR|S_IWUSR, | |
954 | }, | |
955 | }; | |
956 | ||
957 | static int rpc_cachedir_populate(struct dentry *dentry, void *private) | |
958 | { | |
959 | return rpc_populate(dentry, | |
960 | cache_pipefs_files, 0, 3, | |
961 | private); | |
962 | } | |
963 | ||
964 | static void rpc_cachedir_depopulate(struct dentry *dentry) | |
965 | { | |
966 | rpc_depopulate(dentry, cache_pipefs_files, 0, 3); | |
967 | } | |
968 | ||
969 | struct dentry *rpc_create_cache_dir(struct dentry *parent, struct qstr *name, | |
64f1426f | 970 | umode_t umode, struct cache_detail *cd) |
8854e82d TM |
971 | { |
972 | return rpc_mkdir_populate(parent, name, umode, NULL, | |
973 | rpc_cachedir_populate, cd); | |
974 | } | |
975 | ||
976 | void rpc_remove_cache_dir(struct dentry *dentry) | |
977 | { | |
978 | rpc_rmdir_depopulate(dentry, rpc_cachedir_depopulate); | |
979 | } | |
980 | ||
1da177e4 LT |
981 | /* |
982 | * populate the filesystem | |
983 | */ | |
b87221de | 984 | static const struct super_operations s_ops = { |
1da177e4 LT |
985 | .alloc_inode = rpc_alloc_inode, |
986 | .destroy_inode = rpc_destroy_inode, | |
987 | .statfs = simple_statfs, | |
988 | }; | |
989 | ||
990 | #define RPCAUTH_GSSMAGIC 0x67596969 | |
991 | ||
bb156749 TM |
992 | /* |
993 | * We have a single directory with 1 node in it. | |
994 | */ | |
995 | enum { | |
996 | RPCAUTH_lockd, | |
997 | RPCAUTH_mount, | |
998 | RPCAUTH_nfs, | |
999 | RPCAUTH_portmap, | |
1000 | RPCAUTH_statd, | |
1001 | RPCAUTH_nfsd4_cb, | |
e571cbf1 | 1002 | RPCAUTH_cache, |
bb156749 TM |
1003 | RPCAUTH_RootEOF |
1004 | }; | |
1005 | ||
1006 | static const struct rpc_filelist files[] = { | |
1007 | [RPCAUTH_lockd] = { | |
1008 | .name = "lockd", | |
1009 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
1010 | }, | |
1011 | [RPCAUTH_mount] = { | |
1012 | .name = "mount", | |
1013 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
1014 | }, | |
1015 | [RPCAUTH_nfs] = { | |
1016 | .name = "nfs", | |
1017 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
1018 | }, | |
1019 | [RPCAUTH_portmap] = { | |
1020 | .name = "portmap", | |
1021 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
1022 | }, | |
1023 | [RPCAUTH_statd] = { | |
1024 | .name = "statd", | |
1025 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
1026 | }, | |
1027 | [RPCAUTH_nfsd4_cb] = { | |
1028 | .name = "nfsd4_cb", | |
1029 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
1030 | }, | |
e571cbf1 TM |
1031 | [RPCAUTH_cache] = { |
1032 | .name = "cache", | |
1033 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
1034 | }, | |
bb156749 TM |
1035 | }; |
1036 | ||
432eb1a5 SK |
1037 | /* |
1038 | * This call can be used only in RPC pipefs mount notification hooks. | |
1039 | */ | |
1040 | struct dentry *rpc_d_lookup_sb(const struct super_block *sb, | |
1041 | const unsigned char *dir_name) | |
1042 | { | |
1043 | struct qstr dir = { | |
1044 | .name = dir_name, | |
1045 | .len = strlen(dir_name), | |
1046 | .hash = full_name_hash(dir_name, strlen(dir_name)), | |
1047 | }; | |
1048 | ||
1049 | return d_lookup(sb->s_root, &dir); | |
1050 | } | |
1051 | EXPORT_SYMBOL_GPL(rpc_d_lookup_sb); | |
1052 | ||
c21a588f SK |
1053 | void rpc_pipefs_init_net(struct net *net) |
1054 | { | |
1055 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
1056 | ||
1057 | mutex_init(&sn->pipefs_sb_lock); | |
1058 | } | |
1059 | ||
1060 | /* | |
1061 | * This call will be used for per network namespace operations calls. | |
1062 | * Note: Function will be returned with pipefs_sb_lock taken if superblock was | |
1063 | * found. This lock have to be released by rpc_put_sb_net() when all operations | |
1064 | * will be completed. | |
1065 | */ | |
1066 | struct super_block *rpc_get_sb_net(const struct net *net) | |
1067 | { | |
1068 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
1069 | ||
1070 | mutex_lock(&sn->pipefs_sb_lock); | |
1071 | if (sn->pipefs_sb) | |
1072 | return sn->pipefs_sb; | |
1073 | mutex_unlock(&sn->pipefs_sb_lock); | |
1074 | return NULL; | |
1075 | } | |
1076 | EXPORT_SYMBOL_GPL(rpc_get_sb_net); | |
1077 | ||
1078 | void rpc_put_sb_net(const struct net *net) | |
1079 | { | |
1080 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
1081 | ||
1082 | BUG_ON(sn->pipefs_sb == NULL); | |
1083 | mutex_unlock(&sn->pipefs_sb_lock); | |
1084 | } | |
1085 | EXPORT_SYMBOL_GPL(rpc_put_sb_net); | |
1086 | ||
1da177e4 LT |
1087 | static int |
1088 | rpc_fill_super(struct super_block *sb, void *data, int silent) | |
1089 | { | |
1090 | struct inode *inode; | |
1091 | struct dentry *root; | |
38b0da75 | 1092 | struct net *net = data; |
90c4e829 | 1093 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
2d00131a | 1094 | int err; |
1da177e4 LT |
1095 | |
1096 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
1097 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
1098 | sb->s_magic = RPCAUTH_GSSMAGIC; | |
1099 | sb->s_op = &s_ops; | |
1100 | sb->s_time_gran = 1; | |
1101 | ||
1102 | inode = rpc_get_inode(sb, S_IFDIR | 0755); | |
1103 | if (!inode) | |
1104 | return -ENOMEM; | |
fc7bed8c | 1105 | sb->s_root = root = d_alloc_root(inode); |
1da177e4 LT |
1106 | if (!root) { |
1107 | iput(inode); | |
1108 | return -ENOMEM; | |
1109 | } | |
ac6fecee | 1110 | if (rpc_populate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF, NULL)) |
fc7bed8c | 1111 | return -ENOMEM; |
efc46bf2 SK |
1112 | dprintk("RPC: sending pipefs MOUNT notification for net %p%s\n", net, |
1113 | NET_NAME(net)); | |
2d00131a SK |
1114 | err = blocking_notifier_call_chain(&rpc_pipefs_notifier_list, |
1115 | RPC_PIPEFS_MOUNT, | |
1116 | sb); | |
1117 | if (err) | |
1118 | goto err_depopulate; | |
021c68de | 1119 | sb->s_fs_info = get_net(net); |
90c4e829 | 1120 | sn->pipefs_sb = sb; |
1da177e4 | 1121 | return 0; |
2d00131a SK |
1122 | |
1123 | err_depopulate: | |
1124 | blocking_notifier_call_chain(&rpc_pipefs_notifier_list, | |
1125 | RPC_PIPEFS_UMOUNT, | |
1126 | sb); | |
1127 | __rpc_depopulate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF); | |
1128 | return err; | |
1da177e4 LT |
1129 | } |
1130 | ||
fc14f2fe AV |
1131 | static struct dentry * |
1132 | rpc_mount(struct file_system_type *fs_type, | |
1133 | int flags, const char *dev_name, void *data) | |
1da177e4 | 1134 | { |
38b0da75 | 1135 | return mount_ns(fs_type, flags, current->nsproxy->net_ns, rpc_fill_super); |
1da177e4 LT |
1136 | } |
1137 | ||
021c68de SK |
1138 | void rpc_kill_sb(struct super_block *sb) |
1139 | { | |
1140 | struct net *net = sb->s_fs_info; | |
90c4e829 | 1141 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
021c68de | 1142 | |
c21a588f | 1143 | mutex_lock(&sn->pipefs_sb_lock); |
90c4e829 | 1144 | sn->pipefs_sb = NULL; |
c21a588f | 1145 | mutex_unlock(&sn->pipefs_sb_lock); |
021c68de | 1146 | put_net(net); |
efc46bf2 SK |
1147 | dprintk("RPC: sending pipefs UMOUNT notification for net %p%s\n", net, |
1148 | NET_NAME(net)); | |
2d00131a SK |
1149 | blocking_notifier_call_chain(&rpc_pipefs_notifier_list, |
1150 | RPC_PIPEFS_UMOUNT, | |
1151 | sb); | |
021c68de SK |
1152 | kill_litter_super(sb); |
1153 | } | |
1154 | ||
1da177e4 LT |
1155 | static struct file_system_type rpc_pipe_fs_type = { |
1156 | .owner = THIS_MODULE, | |
1157 | .name = "rpc_pipefs", | |
fc14f2fe | 1158 | .mount = rpc_mount, |
021c68de | 1159 | .kill_sb = rpc_kill_sb, |
1da177e4 LT |
1160 | }; |
1161 | ||
1162 | static void | |
51cc5068 | 1163 | init_once(void *foo) |
1da177e4 LT |
1164 | { |
1165 | struct rpc_inode *rpci = (struct rpc_inode *) foo; | |
1166 | ||
a35afb83 CL |
1167 | inode_init_once(&rpci->vfs_inode); |
1168 | rpci->private = NULL; | |
ba9e0975 | 1169 | rpci->pipe = NULL; |
1da177e4 LT |
1170 | } |
1171 | ||
1172 | int register_rpc_pipefs(void) | |
1173 | { | |
5bd5f581 AM |
1174 | int err; |
1175 | ||
1da177e4 | 1176 | rpc_inode_cachep = kmem_cache_create("rpc_inode_cache", |
fffb60f9 PJ |
1177 | sizeof(struct rpc_inode), |
1178 | 0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| | |
1179 | SLAB_MEM_SPREAD), | |
20c2df83 | 1180 | init_once); |
1da177e4 LT |
1181 | if (!rpc_inode_cachep) |
1182 | return -ENOMEM; | |
5bd5f581 AM |
1183 | err = register_filesystem(&rpc_pipe_fs_type); |
1184 | if (err) { | |
1185 | kmem_cache_destroy(rpc_inode_cachep); | |
1186 | return err; | |
1187 | } | |
1188 | ||
1da177e4 LT |
1189 | return 0; |
1190 | } | |
1191 | ||
1192 | void unregister_rpc_pipefs(void) | |
1193 | { | |
1a1d92c1 | 1194 | kmem_cache_destroy(rpc_inode_cachep); |
1da177e4 LT |
1195 | unregister_filesystem(&rpc_pipe_fs_type); |
1196 | } | |
dcbf8c30 MS |
1197 | |
1198 | /* Make 'mount -t rpc_pipefs ...' autoload this module. */ | |
1199 | MODULE_ALIAS("rpc_pipefs"); |