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); |
1da177e4 LT |
209 | kmem_cache_free(rpc_inode_cachep, RPC_I(inode)); |
210 | } | |
211 | ||
fa0d7e3d NP |
212 | static void |
213 | rpc_destroy_inode(struct inode *inode) | |
214 | { | |
215 | call_rcu(&inode->i_rcu, rpc_i_callback); | |
216 | } | |
217 | ||
1da177e4 LT |
218 | static int |
219 | rpc_pipe_open(struct inode *inode, struct file *filp) | |
220 | { | |
d0fe13ba | 221 | struct rpc_pipe *pipe = RPC_I(inode)->pipe; |
c3810608 | 222 | int first_open; |
1da177e4 LT |
223 | int res = -ENXIO; |
224 | ||
1b1dcc1b | 225 | mutex_lock(&inode->i_mutex); |
d0fe13ba | 226 | if (pipe->ops == 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 | { | |
ba9e0975 | 247 | struct rpc_pipe *pipe = RPC_I(inode)->pipe; |
1da177e4 | 248 | struct rpc_pipe_msg *msg; |
e712804a | 249 | int last_close; |
1da177e4 | 250 | |
1b1dcc1b | 251 | mutex_lock(&inode->i_mutex); |
ba9e0975 | 252 | if (pipe->ops == NULL) |
1da177e4 | 253 | goto out; |
655b5bb4 | 254 | msg = filp->private_data; |
1da177e4 | 255 | if (msg != NULL) { |
ba9e0975 | 256 | spin_lock(&pipe->lock); |
48e49187 | 257 | msg->errno = -EAGAIN; |
5a67657a | 258 | list_del_init(&msg->list); |
ba9e0975 SK |
259 | spin_unlock(&pipe->lock); |
260 | pipe->ops->destroy_msg(msg); | |
1da177e4 LT |
261 | } |
262 | if (filp->f_mode & FMODE_WRITE) | |
ba9e0975 | 263 | pipe->nwriters --; |
9842ef35 | 264 | if (filp->f_mode & FMODE_READ) { |
ba9e0975 SK |
265 | pipe->nreaders --; |
266 | if (pipe->nreaders == 0) { | |
9842ef35 | 267 | LIST_HEAD(free_list); |
ba9e0975 SK |
268 | spin_lock(&pipe->lock); |
269 | list_splice_init(&pipe->pipe, &free_list); | |
270 | pipe->pipelen = 0; | |
271 | spin_unlock(&pipe->lock); | |
272 | rpc_purge_list(pipe, &free_list, | |
273 | pipe->ops->destroy_msg, -EAGAIN); | |
9842ef35 TM |
274 | } |
275 | } | |
ba9e0975 SK |
276 | last_close = pipe->nwriters == 0 && pipe->nreaders == 0; |
277 | if (last_close && pipe->ops->release_pipe) | |
278 | pipe->ops->release_pipe(inode); | |
1da177e4 | 279 | out: |
1b1dcc1b | 280 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
281 | return 0; |
282 | } | |
283 | ||
284 | static ssize_t | |
285 | rpc_pipe_read(struct file *filp, char __user *buf, size_t len, loff_t *offset) | |
286 | { | |
303b46bb | 287 | struct inode *inode = filp->f_path.dentry->d_inode; |
d0fe13ba | 288 | struct rpc_pipe *pipe = RPC_I(inode)->pipe; |
1da177e4 LT |
289 | struct rpc_pipe_msg *msg; |
290 | int res = 0; | |
291 | ||
1b1dcc1b | 292 | mutex_lock(&inode->i_mutex); |
d0fe13ba | 293 | if (pipe->ops == NULL) { |
1da177e4 LT |
294 | res = -EPIPE; |
295 | goto out_unlock; | |
296 | } | |
297 | msg = filp->private_data; | |
298 | if (msg == NULL) { | |
d0fe13ba SK |
299 | spin_lock(&pipe->lock); |
300 | if (!list_empty(&pipe->pipe)) { | |
301 | msg = list_entry(pipe->pipe.next, | |
1da177e4 LT |
302 | struct rpc_pipe_msg, |
303 | list); | |
d0fe13ba SK |
304 | list_move(&msg->list, &pipe->in_upcall); |
305 | pipe->pipelen -= msg->len; | |
1da177e4 LT |
306 | filp->private_data = msg; |
307 | msg->copied = 0; | |
308 | } | |
d0fe13ba | 309 | spin_unlock(&pipe->lock); |
1da177e4 LT |
310 | if (msg == NULL) |
311 | goto out_unlock; | |
312 | } | |
313 | /* NOTE: it is up to the callback to update msg->copied */ | |
d0fe13ba | 314 | res = pipe->ops->upcall(filp, msg, buf, len); |
1da177e4 LT |
315 | if (res < 0 || msg->len == msg->copied) { |
316 | filp->private_data = NULL; | |
d0fe13ba | 317 | spin_lock(&pipe->lock); |
5a67657a | 318 | list_del_init(&msg->list); |
d0fe13ba SK |
319 | spin_unlock(&pipe->lock); |
320 | pipe->ops->destroy_msg(msg); | |
1da177e4 LT |
321 | } |
322 | out_unlock: | |
1b1dcc1b | 323 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
324 | return res; |
325 | } | |
326 | ||
327 | static ssize_t | |
328 | rpc_pipe_write(struct file *filp, const char __user *buf, size_t len, loff_t *offset) | |
329 | { | |
303b46bb | 330 | struct inode *inode = filp->f_path.dentry->d_inode; |
d0fe13ba | 331 | struct rpc_pipe *pipe = RPC_I(inode)->pipe; |
1da177e4 LT |
332 | int res; |
333 | ||
1b1dcc1b | 334 | mutex_lock(&inode->i_mutex); |
1da177e4 | 335 | res = -EPIPE; |
d0fe13ba SK |
336 | if (pipe->ops != NULL) |
337 | res = pipe->ops->downcall(filp, buf, len); | |
1b1dcc1b | 338 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
339 | return res; |
340 | } | |
341 | ||
342 | static unsigned int | |
343 | rpc_pipe_poll(struct file *filp, struct poll_table_struct *wait) | |
344 | { | |
d0fe13ba | 345 | struct rpc_pipe *pipe = RPC_I(filp->f_path.dentry->d_inode)->pipe; |
1da177e4 LT |
346 | unsigned int mask = 0; |
347 | ||
d0fe13ba | 348 | poll_wait(filp, &pipe->waitq, wait); |
1da177e4 LT |
349 | |
350 | mask = POLLOUT | POLLWRNORM; | |
d0fe13ba | 351 | if (pipe->ops == NULL) |
1da177e4 | 352 | mask |= POLLERR | POLLHUP; |
d0fe13ba | 353 | if (filp->private_data || !list_empty(&pipe->pipe)) |
1da177e4 LT |
354 | mask |= POLLIN | POLLRDNORM; |
355 | return mask; | |
356 | } | |
357 | ||
a6f8dbc6 AB |
358 | static long |
359 | rpc_pipe_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) | |
1da177e4 | 360 | { |
a6f8dbc6 | 361 | struct inode *inode = filp->f_path.dentry->d_inode; |
d0fe13ba | 362 | struct rpc_pipe *pipe = RPC_I(inode)->pipe; |
1da177e4 LT |
363 | int len; |
364 | ||
365 | switch (cmd) { | |
366 | case FIONREAD: | |
d0fe13ba SK |
367 | spin_lock(&pipe->lock); |
368 | if (pipe->ops == NULL) { | |
369 | spin_unlock(&pipe->lock); | |
1da177e4 | 370 | return -EPIPE; |
a6f8dbc6 | 371 | } |
d0fe13ba | 372 | len = pipe->pipelen; |
1da177e4 LT |
373 | if (filp->private_data) { |
374 | struct rpc_pipe_msg *msg; | |
655b5bb4 | 375 | msg = filp->private_data; |
1da177e4 LT |
376 | len += msg->len - msg->copied; |
377 | } | |
d0fe13ba | 378 | spin_unlock(&pipe->lock); |
1da177e4 LT |
379 | return put_user(len, (int __user *)arg); |
380 | default: | |
381 | return -EINVAL; | |
382 | } | |
383 | } | |
384 | ||
da7071d7 | 385 | static const struct file_operations rpc_pipe_fops = { |
1da177e4 LT |
386 | .owner = THIS_MODULE, |
387 | .llseek = no_llseek, | |
388 | .read = rpc_pipe_read, | |
389 | .write = rpc_pipe_write, | |
390 | .poll = rpc_pipe_poll, | |
674b604c | 391 | .unlocked_ioctl = rpc_pipe_ioctl, |
1da177e4 LT |
392 | .open = rpc_pipe_open, |
393 | .release = rpc_pipe_release, | |
394 | }; | |
395 | ||
396 | static int | |
397 | rpc_show_info(struct seq_file *m, void *v) | |
398 | { | |
399 | struct rpc_clnt *clnt = m->private; | |
400 | ||
401 | seq_printf(m, "RPC server: %s\n", clnt->cl_server); | |
402 | seq_printf(m, "service: %s (%d) version %d\n", clnt->cl_protname, | |
403 | clnt->cl_prog, clnt->cl_vers); | |
e7f78657 CL |
404 | seq_printf(m, "address: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_ADDR)); |
405 | seq_printf(m, "protocol: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PROTO)); | |
bf19aace | 406 | seq_printf(m, "port: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PORT)); |
1da177e4 LT |
407 | return 0; |
408 | } | |
409 | ||
410 | static int | |
411 | rpc_info_open(struct inode *inode, struct file *file) | |
412 | { | |
006abe88 | 413 | struct rpc_clnt *clnt = NULL; |
1da177e4 LT |
414 | int ret = single_open(file, rpc_show_info, NULL); |
415 | ||
416 | if (!ret) { | |
417 | struct seq_file *m = file->private_data; | |
006abe88 TM |
418 | |
419 | spin_lock(&file->f_path.dentry->d_lock); | |
420 | if (!d_unhashed(file->f_path.dentry)) | |
421 | clnt = RPC_I(inode)->private; | |
422 | if (clnt != NULL && atomic_inc_not_zero(&clnt->cl_count)) { | |
423 | spin_unlock(&file->f_path.dentry->d_lock); | |
1da177e4 LT |
424 | m->private = clnt; |
425 | } else { | |
006abe88 | 426 | spin_unlock(&file->f_path.dentry->d_lock); |
1da177e4 LT |
427 | single_release(inode, file); |
428 | ret = -EINVAL; | |
429 | } | |
1da177e4 LT |
430 | } |
431 | return ret; | |
432 | } | |
433 | ||
434 | static int | |
435 | rpc_info_release(struct inode *inode, struct file *file) | |
436 | { | |
437 | struct seq_file *m = file->private_data; | |
438 | struct rpc_clnt *clnt = (struct rpc_clnt *)m->private; | |
439 | ||
440 | if (clnt) | |
441 | rpc_release_client(clnt); | |
442 | return single_release(inode, file); | |
443 | } | |
444 | ||
da7071d7 | 445 | static const struct file_operations rpc_info_operations = { |
1da177e4 LT |
446 | .owner = THIS_MODULE, |
447 | .open = rpc_info_open, | |
448 | .read = seq_read, | |
449 | .llseek = seq_lseek, | |
450 | .release = rpc_info_release, | |
451 | }; | |
452 | ||
453 | ||
1da177e4 LT |
454 | /* |
455 | * Description of fs contents. | |
456 | */ | |
457 | struct rpc_filelist { | |
ac6fecee | 458 | const char *name; |
99ac48f5 | 459 | const struct file_operations *i_fop; |
7364af6a | 460 | umode_t mode; |
1da177e4 LT |
461 | }; |
462 | ||
54281548 | 463 | struct vfsmount *rpc_get_mount(void) |
1da177e4 | 464 | { |
54281548 TM |
465 | int err; |
466 | ||
fc14f2fe | 467 | err = simple_pin_fs(&rpc_pipe_fs_type, &rpc_mnt, &rpc_mount_count); |
54281548 TM |
468 | if (err != 0) |
469 | return ERR_PTR(err); | |
fc14f2fe | 470 | return rpc_mnt; |
1da177e4 | 471 | } |
e571cbf1 | 472 | EXPORT_SYMBOL_GPL(rpc_get_mount); |
1da177e4 | 473 | |
54281548 | 474 | void rpc_put_mount(void) |
1da177e4 | 475 | { |
fc14f2fe | 476 | simple_release_fs(&rpc_mnt, &rpc_mount_count); |
1da177e4 | 477 | } |
e571cbf1 | 478 | EXPORT_SYMBOL_GPL(rpc_put_mount); |
1da177e4 | 479 | |
fe15ce44 | 480 | static int rpc_delete_dentry(const struct dentry *dentry) |
62e1761c TM |
481 | { |
482 | return 1; | |
483 | } | |
484 | ||
3ba13d17 | 485 | static const struct dentry_operations rpc_dentry_operations = { |
62e1761c TM |
486 | .d_delete = rpc_delete_dentry, |
487 | }; | |
488 | ||
1da177e4 | 489 | static struct inode * |
7364af6a | 490 | rpc_get_inode(struct super_block *sb, umode_t mode) |
1da177e4 LT |
491 | { |
492 | struct inode *inode = new_inode(sb); | |
493 | if (!inode) | |
494 | return NULL; | |
85fe4025 | 495 | inode->i_ino = get_next_ino(); |
1da177e4 | 496 | inode->i_mode = mode; |
1da177e4 | 497 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
89f0e4fe JP |
498 | switch (mode & S_IFMT) { |
499 | case S_IFDIR: | |
500 | inode->i_fop = &simple_dir_operations; | |
501 | inode->i_op = &simple_dir_inode_operations; | |
502 | inc_nlink(inode); | |
503 | default: | |
504 | break; | |
1da177e4 LT |
505 | } |
506 | return inode; | |
507 | } | |
508 | ||
7589806e TM |
509 | static int __rpc_create_common(struct inode *dir, struct dentry *dentry, |
510 | umode_t mode, | |
511 | const struct file_operations *i_fop, | |
512 | void *private) | |
513 | { | |
514 | struct inode *inode; | |
515 | ||
beb0f0a9 | 516 | d_drop(dentry); |
7589806e TM |
517 | inode = rpc_get_inode(dir->i_sb, mode); |
518 | if (!inode) | |
519 | goto out_err; | |
520 | inode->i_ino = iunique(dir->i_sb, 100); | |
521 | if (i_fop) | |
522 | inode->i_fop = i_fop; | |
523 | if (private) | |
524 | rpc_inode_setowner(inode, private); | |
525 | d_add(dentry, inode); | |
526 | return 0; | |
527 | out_err: | |
528 | printk(KERN_WARNING "%s: %s failed to allocate inode for dentry %s\n", | |
529 | __FILE__, __func__, dentry->d_name.name); | |
530 | dput(dentry); | |
531 | return -ENOMEM; | |
532 | } | |
533 | ||
ac6fecee TM |
534 | static int __rpc_create(struct inode *dir, struct dentry *dentry, |
535 | umode_t mode, | |
536 | const struct file_operations *i_fop, | |
537 | void *private) | |
538 | { | |
539 | int err; | |
540 | ||
541 | err = __rpc_create_common(dir, dentry, S_IFREG | mode, i_fop, private); | |
542 | if (err) | |
543 | return err; | |
544 | fsnotify_create(dir, dentry); | |
545 | return 0; | |
546 | } | |
547 | ||
7589806e TM |
548 | static int __rpc_mkdir(struct inode *dir, struct dentry *dentry, |
549 | umode_t mode, | |
550 | const struct file_operations *i_fop, | |
551 | void *private) | |
552 | { | |
553 | int err; | |
554 | ||
555 | err = __rpc_create_common(dir, dentry, S_IFDIR | mode, i_fop, private); | |
556 | if (err) | |
557 | return err; | |
558 | inc_nlink(dir); | |
559 | fsnotify_mkdir(dir, dentry); | |
560 | return 0; | |
561 | } | |
562 | ||
ba9e0975 SK |
563 | static void |
564 | init_pipe(struct rpc_pipe *pipe) | |
565 | { | |
566 | pipe->nreaders = 0; | |
567 | pipe->nwriters = 0; | |
568 | INIT_LIST_HEAD(&pipe->in_upcall); | |
569 | INIT_LIST_HEAD(&pipe->in_downcall); | |
570 | INIT_LIST_HEAD(&pipe->pipe); | |
571 | pipe->pipelen = 0; | |
572 | init_waitqueue_head(&pipe->waitq); | |
573 | INIT_DELAYED_WORK(&pipe->queue_timeout, | |
574 | rpc_timeout_upcall_queue); | |
575 | pipe->ops = NULL; | |
576 | spin_lock_init(&pipe->lock); | |
c239d83b SK |
577 | pipe->dentry = NULL; |
578 | } | |
ba9e0975 | 579 | |
c239d83b SK |
580 | void rpc_destroy_pipe_data(struct rpc_pipe *pipe) |
581 | { | |
582 | kfree(pipe); | |
ba9e0975 | 583 | } |
c239d83b | 584 | EXPORT_SYMBOL_GPL(rpc_destroy_pipe_data); |
ba9e0975 | 585 | |
c239d83b | 586 | struct rpc_pipe *rpc_mkpipe_data(const struct rpc_pipe_ops *ops, int flags) |
7589806e | 587 | { |
ba9e0975 | 588 | struct rpc_pipe *pipe; |
7589806e | 589 | |
ba9e0975 SK |
590 | pipe = kzalloc(sizeof(struct rpc_pipe), GFP_KERNEL); |
591 | if (!pipe) | |
c239d83b | 592 | return ERR_PTR(-ENOMEM); |
ba9e0975 | 593 | init_pipe(pipe); |
c239d83b SK |
594 | pipe->ops = ops; |
595 | pipe->flags = flags; | |
596 | return pipe; | |
597 | } | |
598 | EXPORT_SYMBOL_GPL(rpc_mkpipe_data); | |
599 | ||
600 | static int __rpc_mkpipe_dentry(struct inode *dir, struct dentry *dentry, | |
601 | umode_t mode, | |
602 | const struct file_operations *i_fop, | |
603 | void *private, | |
604 | struct rpc_pipe *pipe) | |
605 | { | |
606 | struct rpc_inode *rpci; | |
607 | int err; | |
608 | ||
7589806e | 609 | err = __rpc_create_common(dir, dentry, S_IFIFO | mode, i_fop, private); |
c239d83b | 610 | if (err) |
7589806e TM |
611 | return err; |
612 | rpci = RPC_I(dentry->d_inode); | |
7589806e | 613 | rpci->private = private; |
ba9e0975 | 614 | rpci->pipe = pipe; |
7589806e TM |
615 | fsnotify_create(dir, dentry); |
616 | return 0; | |
617 | } | |
618 | ||
ac6fecee TM |
619 | static int __rpc_rmdir(struct inode *dir, struct dentry *dentry) |
620 | { | |
621 | int ret; | |
622 | ||
623 | dget(dentry); | |
624 | ret = simple_rmdir(dir, dentry); | |
625 | d_delete(dentry); | |
626 | dput(dentry); | |
627 | return ret; | |
628 | } | |
629 | ||
810d90bc TM |
630 | static int __rpc_unlink(struct inode *dir, struct dentry *dentry) |
631 | { | |
632 | int ret; | |
633 | ||
634 | dget(dentry); | |
635 | ret = simple_unlink(dir, dentry); | |
636 | d_delete(dentry); | |
637 | dput(dentry); | |
638 | return ret; | |
639 | } | |
640 | ||
641 | static int __rpc_rmpipe(struct inode *dir, struct dentry *dentry) | |
642 | { | |
643 | struct inode *inode = dentry->d_inode; | |
810d90bc | 644 | |
810d90bc TM |
645 | rpc_close_pipes(inode); |
646 | return __rpc_unlink(dir, dentry); | |
647 | } | |
648 | ||
5bff0386 | 649 | static struct dentry *__rpc_lookup_create_exclusive(struct dentry *parent, |
cfeaa4a3 TM |
650 | struct qstr *name) |
651 | { | |
652 | struct dentry *dentry; | |
653 | ||
654 | dentry = d_lookup(parent, name); | |
655 | if (!dentry) { | |
656 | dentry = d_alloc(parent, name); | |
5bff0386 SK |
657 | if (!dentry) |
658 | return ERR_PTR(-ENOMEM); | |
cfeaa4a3 | 659 | } |
5bff0386 | 660 | if (dentry->d_inode == NULL) { |
fb045adb | 661 | d_set_d_op(dentry, &rpc_dentry_operations); |
cfeaa4a3 | 662 | return dentry; |
5bff0386 | 663 | } |
cfeaa4a3 TM |
664 | dput(dentry); |
665 | return ERR_PTR(-EEXIST); | |
666 | } | |
667 | ||
1da177e4 LT |
668 | /* |
669 | * FIXME: This probably has races. | |
670 | */ | |
ac6fecee TM |
671 | static void __rpc_depopulate(struct dentry *parent, |
672 | const struct rpc_filelist *files, | |
673 | int start, int eof) | |
1da177e4 LT |
674 | { |
675 | struct inode *dir = parent->d_inode; | |
ac6fecee TM |
676 | struct dentry *dentry; |
677 | struct qstr name; | |
678 | int i; | |
1da177e4 | 679 | |
ac6fecee TM |
680 | for (i = start; i < eof; i++) { |
681 | name.name = files[i].name; | |
682 | name.len = strlen(files[i].name); | |
683 | name.hash = full_name_hash(name.name, name.len); | |
684 | dentry = d_lookup(parent, &name); | |
685 | ||
686 | if (dentry == NULL) | |
62e1761c | 687 | continue; |
ac6fecee TM |
688 | if (dentry->d_inode == NULL) |
689 | goto next; | |
690 | switch (dentry->d_inode->i_mode & S_IFMT) { | |
691 | default: | |
692 | BUG(); | |
693 | case S_IFREG: | |
694 | __rpc_unlink(dir, dentry); | |
1da177e4 | 695 | break; |
ac6fecee TM |
696 | case S_IFDIR: |
697 | __rpc_rmdir(dir, dentry); | |
698 | } | |
699 | next: | |
700 | dput(dentry); | |
1da177e4 | 701 | } |
ac6fecee TM |
702 | } |
703 | ||
704 | static void rpc_depopulate(struct dentry *parent, | |
705 | const struct rpc_filelist *files, | |
706 | int start, int eof) | |
707 | { | |
708 | struct inode *dir = parent->d_inode; | |
709 | ||
710 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_CHILD); | |
711 | __rpc_depopulate(parent, files, start, eof); | |
1b1dcc1b | 712 | mutex_unlock(&dir->i_mutex); |
1da177e4 LT |
713 | } |
714 | ||
ac6fecee TM |
715 | static int rpc_populate(struct dentry *parent, |
716 | const struct rpc_filelist *files, | |
717 | int start, int eof, | |
718 | void *private) | |
1da177e4 | 719 | { |
ac6fecee | 720 | struct inode *dir = parent->d_inode; |
1da177e4 | 721 | struct dentry *dentry; |
ac6fecee | 722 | int i, err; |
1da177e4 | 723 | |
1b1dcc1b | 724 | mutex_lock(&dir->i_mutex); |
1da177e4 | 725 | for (i = start; i < eof; i++) { |
ac6fecee TM |
726 | struct qstr q; |
727 | ||
728 | q.name = files[i].name; | |
729 | q.len = strlen(files[i].name); | |
730 | q.hash = full_name_hash(q.name, q.len); | |
731 | dentry = __rpc_lookup_create_exclusive(parent, &q); | |
732 | err = PTR_ERR(dentry); | |
733 | if (IS_ERR(dentry)) | |
1da177e4 | 734 | goto out_bad; |
ac6fecee TM |
735 | switch (files[i].mode & S_IFMT) { |
736 | default: | |
737 | BUG(); | |
738 | case S_IFREG: | |
739 | err = __rpc_create(dir, dentry, | |
740 | files[i].mode, | |
741 | files[i].i_fop, | |
742 | private); | |
743 | break; | |
744 | case S_IFDIR: | |
745 | err = __rpc_mkdir(dir, dentry, | |
746 | files[i].mode, | |
747 | NULL, | |
748 | private); | |
1da177e4 | 749 | } |
ac6fecee TM |
750 | if (err != 0) |
751 | goto out_bad; | |
1da177e4 | 752 | } |
1b1dcc1b | 753 | mutex_unlock(&dir->i_mutex); |
1da177e4 LT |
754 | return 0; |
755 | out_bad: | |
ac6fecee | 756 | __rpc_depopulate(parent, files, start, eof); |
1b1dcc1b | 757 | mutex_unlock(&dir->i_mutex); |
1da177e4 | 758 | printk(KERN_WARNING "%s: %s failed to populate directory %s\n", |
0dc47877 | 759 | __FILE__, __func__, parent->d_name.name); |
ac6fecee | 760 | return err; |
f134585a | 761 | } |
1da177e4 | 762 | |
e57aed77 TM |
763 | static struct dentry *rpc_mkdir_populate(struct dentry *parent, |
764 | struct qstr *name, umode_t mode, void *private, | |
765 | int (*populate)(struct dentry *, void *), void *args_populate) | |
f134585a | 766 | { |
f134585a | 767 | struct dentry *dentry; |
7d59d1e8 | 768 | struct inode *dir = parent->d_inode; |
f134585a TM |
769 | int error; |
770 | ||
7d59d1e8 TM |
771 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); |
772 | dentry = __rpc_lookup_create_exclusive(parent, name); | |
f134585a | 773 | if (IS_ERR(dentry)) |
7d59d1e8 TM |
774 | goto out; |
775 | error = __rpc_mkdir(dir, dentry, mode, NULL, private); | |
7589806e TM |
776 | if (error != 0) |
777 | goto out_err; | |
e57aed77 TM |
778 | if (populate != NULL) { |
779 | error = populate(dentry, args_populate); | |
780 | if (error) | |
781 | goto err_rmdir; | |
782 | } | |
f134585a | 783 | out: |
1b1dcc1b | 784 | mutex_unlock(&dir->i_mutex); |
5c3e985a | 785 | return dentry; |
ac6fecee | 786 | err_rmdir: |
f134585a | 787 | __rpc_rmdir(dir, dentry); |
7589806e | 788 | out_err: |
f134585a TM |
789 | dentry = ERR_PTR(error); |
790 | goto out; | |
1da177e4 LT |
791 | } |
792 | ||
e57aed77 TM |
793 | static int rpc_rmdir_depopulate(struct dentry *dentry, |
794 | void (*depopulate)(struct dentry *)) | |
1da177e4 | 795 | { |
dff02cc1 | 796 | struct dentry *parent; |
f134585a TM |
797 | struct inode *dir; |
798 | int error; | |
278c995c | 799 | |
dff02cc1 TM |
800 | parent = dget_parent(dentry); |
801 | dir = parent->d_inode; | |
c6573c29 | 802 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); |
e57aed77 TM |
803 | if (depopulate != NULL) |
804 | depopulate(dentry); | |
f134585a | 805 | error = __rpc_rmdir(dir, dentry); |
1b1dcc1b | 806 | mutex_unlock(&dir->i_mutex); |
dff02cc1 | 807 | dput(parent); |
f134585a | 808 | return error; |
1da177e4 LT |
809 | } |
810 | ||
93a44a75 BF |
811 | /** |
812 | * rpc_mkpipe - make an rpc_pipefs file for kernel<->userspace communication | |
813 | * @parent: dentry of directory to create new "pipe" in | |
814 | * @name: name of pipe | |
815 | * @private: private data to associate with the pipe, for the caller's use | |
816 | * @ops: operations defining the behavior of the pipe: upcall, downcall, | |
c3810608 | 817 | * release_pipe, open_pipe, and destroy_msg. |
d0fe13ba | 818 | * @flags: rpc_pipe flags |
93a44a75 BF |
819 | * |
820 | * Data is made available for userspace to read by calls to | |
821 | * rpc_queue_upcall(). The actual reads will result in calls to | |
822 | * @ops->upcall, which will be called with the file pointer, | |
823 | * message, and userspace buffer to copy to. | |
824 | * | |
825 | * Writes can come at any time, and do not necessarily have to be | |
826 | * responses to upcalls. They will result in calls to @msg->downcall. | |
827 | * | |
828 | * The @private argument passed here will be available to all these methods | |
829 | * from the file pointer, via RPC_I(file->f_dentry->d_inode)->private. | |
830 | */ | |
c239d83b SK |
831 | struct dentry *rpc_mkpipe_dentry(struct dentry *parent, const char *name, |
832 | void *private, struct rpc_pipe *pipe) | |
1da177e4 | 833 | { |
1da177e4 | 834 | struct dentry *dentry; |
7589806e | 835 | struct inode *dir = parent->d_inode; |
7364af6a | 836 | umode_t umode = S_IFIFO | S_IRUSR | S_IWUSR; |
cfeaa4a3 | 837 | struct qstr q; |
7589806e | 838 | int err; |
7364af6a | 839 | |
c239d83b | 840 | if (pipe->ops->upcall == NULL) |
7364af6a | 841 | umode &= ~S_IRUGO; |
c239d83b | 842 | if (pipe->ops->downcall == NULL) |
7364af6a | 843 | umode &= ~S_IWUGO; |
1da177e4 | 844 | |
cfeaa4a3 TM |
845 | q.name = name; |
846 | q.len = strlen(name); | |
847 | q.hash = full_name_hash(q.name, q.len), | |
848 | ||
849 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); | |
5bff0386 | 850 | dentry = __rpc_lookup_create_exclusive(parent, &q); |
1da177e4 | 851 | if (IS_ERR(dentry)) |
cfeaa4a3 | 852 | goto out; |
c239d83b SK |
853 | err = __rpc_mkpipe_dentry(dir, dentry, umode, &rpc_pipe_fops, |
854 | private, pipe); | |
7589806e TM |
855 | if (err) |
856 | goto out_err; | |
f134585a | 857 | out: |
1b1dcc1b | 858 | mutex_unlock(&dir->i_mutex); |
5c3e985a | 859 | return dentry; |
7589806e TM |
860 | out_err: |
861 | dentry = ERR_PTR(err); | |
158998b6 | 862 | printk(KERN_WARNING "%s: %s() failed to create pipe %s/%s (errno = %d)\n", |
0dc47877 | 863 | __FILE__, __func__, parent->d_name.name, name, |
7589806e | 864 | err); |
f134585a | 865 | goto out; |
1da177e4 | 866 | } |
c239d83b | 867 | EXPORT_SYMBOL_GPL(rpc_mkpipe_dentry); |
1da177e4 | 868 | |
93a44a75 BF |
869 | /** |
870 | * rpc_unlink - remove a pipe | |
871 | * @dentry: dentry for the pipe, as returned from rpc_mkpipe | |
872 | * | |
873 | * After this call, lookups will no longer find the pipe, and any | |
874 | * attempts to read or write using preexisting opens of the pipe will | |
875 | * return -EPIPE. | |
876 | */ | |
f134585a | 877 | int |
5d67476f | 878 | rpc_unlink(struct dentry *dentry) |
1da177e4 | 879 | { |
5d67476f | 880 | struct dentry *parent; |
f134585a | 881 | struct inode *dir; |
5d67476f | 882 | int error = 0; |
1da177e4 | 883 | |
5d67476f TM |
884 | parent = dget_parent(dentry); |
885 | dir = parent->d_inode; | |
c6573c29 | 886 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); |
810d90bc | 887 | error = __rpc_rmpipe(dir, dentry); |
1b1dcc1b | 888 | mutex_unlock(&dir->i_mutex); |
5d67476f | 889 | dput(parent); |
f134585a | 890 | return error; |
1da177e4 | 891 | } |
468039ee | 892 | EXPORT_SYMBOL_GPL(rpc_unlink); |
1da177e4 | 893 | |
e57aed77 TM |
894 | enum { |
895 | RPCAUTH_info, | |
896 | RPCAUTH_EOF | |
897 | }; | |
898 | ||
899 | static const struct rpc_filelist authfiles[] = { | |
900 | [RPCAUTH_info] = { | |
901 | .name = "info", | |
902 | .i_fop = &rpc_info_operations, | |
903 | .mode = S_IFREG | S_IRUSR, | |
904 | }, | |
905 | }; | |
906 | ||
907 | static int rpc_clntdir_populate(struct dentry *dentry, void *private) | |
908 | { | |
909 | return rpc_populate(dentry, | |
910 | authfiles, RPCAUTH_info, RPCAUTH_EOF, | |
911 | private); | |
912 | } | |
913 | ||
914 | static void rpc_clntdir_depopulate(struct dentry *dentry) | |
915 | { | |
916 | rpc_depopulate(dentry, authfiles, RPCAUTH_info, RPCAUTH_EOF); | |
917 | } | |
918 | ||
7d59d1e8 TM |
919 | /** |
920 | * rpc_create_client_dir - Create a new rpc_client directory in rpc_pipefs | |
4111d4fd RD |
921 | * @dentry: dentry from the rpc_pipefs root to the new directory |
922 | * @name: &struct qstr for the name | |
7d59d1e8 TM |
923 | * @rpc_client: rpc client to associate with this directory |
924 | * | |
925 | * This creates a directory at the given @path associated with | |
926 | * @rpc_clnt, which will contain a file named "info" with some basic | |
927 | * information about the client, together with any "pipes" that may | |
928 | * later be created using rpc_mkpipe(). | |
929 | */ | |
23ac6581 | 930 | struct dentry *rpc_create_client_dir(struct dentry *dentry, |
e57aed77 TM |
931 | struct qstr *name, |
932 | struct rpc_clnt *rpc_client) | |
933 | { | |
934 | return rpc_mkdir_populate(dentry, name, S_IRUGO | S_IXUGO, NULL, | |
935 | rpc_clntdir_populate, rpc_client); | |
936 | } | |
937 | ||
938 | /** | |
939 | * rpc_remove_client_dir - Remove a directory created with rpc_create_client_dir() | |
80df9d20 | 940 | * @clnt: rpc client |
e57aed77 TM |
941 | */ |
942 | int rpc_remove_client_dir(struct dentry *dentry) | |
7d59d1e8 | 943 | { |
e57aed77 | 944 | return rpc_rmdir_depopulate(dentry, rpc_clntdir_depopulate); |
7d59d1e8 TM |
945 | } |
946 | ||
8854e82d TM |
947 | static const struct rpc_filelist cache_pipefs_files[3] = { |
948 | [0] = { | |
949 | .name = "channel", | |
950 | .i_fop = &cache_file_operations_pipefs, | |
96c61cbd | 951 | .mode = S_IFREG|S_IRUSR|S_IWUSR, |
8854e82d TM |
952 | }, |
953 | [1] = { | |
954 | .name = "content", | |
955 | .i_fop = &content_file_operations_pipefs, | |
956 | .mode = S_IFREG|S_IRUSR, | |
957 | }, | |
958 | [2] = { | |
959 | .name = "flush", | |
960 | .i_fop = &cache_flush_operations_pipefs, | |
961 | .mode = S_IFREG|S_IRUSR|S_IWUSR, | |
962 | }, | |
963 | }; | |
964 | ||
965 | static int rpc_cachedir_populate(struct dentry *dentry, void *private) | |
966 | { | |
967 | return rpc_populate(dentry, | |
968 | cache_pipefs_files, 0, 3, | |
969 | private); | |
970 | } | |
971 | ||
972 | static void rpc_cachedir_depopulate(struct dentry *dentry) | |
973 | { | |
974 | rpc_depopulate(dentry, cache_pipefs_files, 0, 3); | |
975 | } | |
976 | ||
977 | struct dentry *rpc_create_cache_dir(struct dentry *parent, struct qstr *name, | |
64f1426f | 978 | umode_t umode, struct cache_detail *cd) |
8854e82d TM |
979 | { |
980 | return rpc_mkdir_populate(parent, name, umode, NULL, | |
981 | rpc_cachedir_populate, cd); | |
982 | } | |
983 | ||
984 | void rpc_remove_cache_dir(struct dentry *dentry) | |
985 | { | |
986 | rpc_rmdir_depopulate(dentry, rpc_cachedir_depopulate); | |
987 | } | |
988 | ||
1da177e4 LT |
989 | /* |
990 | * populate the filesystem | |
991 | */ | |
b87221de | 992 | static const struct super_operations s_ops = { |
1da177e4 LT |
993 | .alloc_inode = rpc_alloc_inode, |
994 | .destroy_inode = rpc_destroy_inode, | |
995 | .statfs = simple_statfs, | |
996 | }; | |
997 | ||
998 | #define RPCAUTH_GSSMAGIC 0x67596969 | |
999 | ||
bb156749 TM |
1000 | /* |
1001 | * We have a single directory with 1 node in it. | |
1002 | */ | |
1003 | enum { | |
1004 | RPCAUTH_lockd, | |
1005 | RPCAUTH_mount, | |
1006 | RPCAUTH_nfs, | |
1007 | RPCAUTH_portmap, | |
1008 | RPCAUTH_statd, | |
1009 | RPCAUTH_nfsd4_cb, | |
e571cbf1 | 1010 | RPCAUTH_cache, |
bb156749 TM |
1011 | RPCAUTH_RootEOF |
1012 | }; | |
1013 | ||
1014 | static const struct rpc_filelist files[] = { | |
1015 | [RPCAUTH_lockd] = { | |
1016 | .name = "lockd", | |
1017 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
1018 | }, | |
1019 | [RPCAUTH_mount] = { | |
1020 | .name = "mount", | |
1021 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
1022 | }, | |
1023 | [RPCAUTH_nfs] = { | |
1024 | .name = "nfs", | |
1025 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
1026 | }, | |
1027 | [RPCAUTH_portmap] = { | |
1028 | .name = "portmap", | |
1029 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
1030 | }, | |
1031 | [RPCAUTH_statd] = { | |
1032 | .name = "statd", | |
1033 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
1034 | }, | |
1035 | [RPCAUTH_nfsd4_cb] = { | |
1036 | .name = "nfsd4_cb", | |
1037 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
1038 | }, | |
e571cbf1 TM |
1039 | [RPCAUTH_cache] = { |
1040 | .name = "cache", | |
1041 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
1042 | }, | |
bb156749 TM |
1043 | }; |
1044 | ||
432eb1a5 SK |
1045 | /* |
1046 | * This call can be used only in RPC pipefs mount notification hooks. | |
1047 | */ | |
1048 | struct dentry *rpc_d_lookup_sb(const struct super_block *sb, | |
1049 | const unsigned char *dir_name) | |
1050 | { | |
1051 | struct qstr dir = { | |
1052 | .name = dir_name, | |
1053 | .len = strlen(dir_name), | |
1054 | .hash = full_name_hash(dir_name, strlen(dir_name)), | |
1055 | }; | |
1056 | ||
1057 | return d_lookup(sb->s_root, &dir); | |
1058 | } | |
1059 | EXPORT_SYMBOL_GPL(rpc_d_lookup_sb); | |
1060 | ||
c21a588f SK |
1061 | void rpc_pipefs_init_net(struct net *net) |
1062 | { | |
1063 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
1064 | ||
1065 | mutex_init(&sn->pipefs_sb_lock); | |
1066 | } | |
1067 | ||
1068 | /* | |
1069 | * This call will be used for per network namespace operations calls. | |
1070 | * Note: Function will be returned with pipefs_sb_lock taken if superblock was | |
1071 | * found. This lock have to be released by rpc_put_sb_net() when all operations | |
1072 | * will be completed. | |
1073 | */ | |
1074 | struct super_block *rpc_get_sb_net(const struct net *net) | |
1075 | { | |
1076 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
1077 | ||
1078 | mutex_lock(&sn->pipefs_sb_lock); | |
1079 | if (sn->pipefs_sb) | |
1080 | return sn->pipefs_sb; | |
1081 | mutex_unlock(&sn->pipefs_sb_lock); | |
1082 | return NULL; | |
1083 | } | |
1084 | EXPORT_SYMBOL_GPL(rpc_get_sb_net); | |
1085 | ||
1086 | void rpc_put_sb_net(const struct net *net) | |
1087 | { | |
1088 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
1089 | ||
1090 | BUG_ON(sn->pipefs_sb == NULL); | |
1091 | mutex_unlock(&sn->pipefs_sb_lock); | |
1092 | } | |
1093 | EXPORT_SYMBOL_GPL(rpc_put_sb_net); | |
1094 | ||
1da177e4 LT |
1095 | static int |
1096 | rpc_fill_super(struct super_block *sb, void *data, int silent) | |
1097 | { | |
1098 | struct inode *inode; | |
1099 | struct dentry *root; | |
38b0da75 | 1100 | struct net *net = data; |
90c4e829 | 1101 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
2d00131a | 1102 | int err; |
1da177e4 LT |
1103 | |
1104 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
1105 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
1106 | sb->s_magic = RPCAUTH_GSSMAGIC; | |
1107 | sb->s_op = &s_ops; | |
1108 | sb->s_time_gran = 1; | |
1109 | ||
1110 | inode = rpc_get_inode(sb, S_IFDIR | 0755); | |
1111 | if (!inode) | |
1112 | return -ENOMEM; | |
fc7bed8c | 1113 | sb->s_root = root = d_alloc_root(inode); |
1da177e4 LT |
1114 | if (!root) { |
1115 | iput(inode); | |
1116 | return -ENOMEM; | |
1117 | } | |
ac6fecee | 1118 | if (rpc_populate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF, NULL)) |
fc7bed8c | 1119 | return -ENOMEM; |
efc46bf2 SK |
1120 | dprintk("RPC: sending pipefs MOUNT notification for net %p%s\n", net, |
1121 | NET_NAME(net)); | |
2d00131a SK |
1122 | err = blocking_notifier_call_chain(&rpc_pipefs_notifier_list, |
1123 | RPC_PIPEFS_MOUNT, | |
1124 | sb); | |
1125 | if (err) | |
1126 | goto err_depopulate; | |
021c68de | 1127 | sb->s_fs_info = get_net(net); |
90c4e829 | 1128 | sn->pipefs_sb = sb; |
1da177e4 | 1129 | return 0; |
2d00131a SK |
1130 | |
1131 | err_depopulate: | |
1132 | blocking_notifier_call_chain(&rpc_pipefs_notifier_list, | |
1133 | RPC_PIPEFS_UMOUNT, | |
1134 | sb); | |
1135 | __rpc_depopulate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF); | |
1136 | return err; | |
1da177e4 LT |
1137 | } |
1138 | ||
fc14f2fe AV |
1139 | static struct dentry * |
1140 | rpc_mount(struct file_system_type *fs_type, | |
1141 | int flags, const char *dev_name, void *data) | |
1da177e4 | 1142 | { |
38b0da75 | 1143 | return mount_ns(fs_type, flags, current->nsproxy->net_ns, rpc_fill_super); |
1da177e4 LT |
1144 | } |
1145 | ||
021c68de SK |
1146 | void rpc_kill_sb(struct super_block *sb) |
1147 | { | |
1148 | struct net *net = sb->s_fs_info; | |
90c4e829 | 1149 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
021c68de | 1150 | |
c21a588f | 1151 | mutex_lock(&sn->pipefs_sb_lock); |
90c4e829 | 1152 | sn->pipefs_sb = NULL; |
c21a588f | 1153 | mutex_unlock(&sn->pipefs_sb_lock); |
021c68de | 1154 | put_net(net); |
efc46bf2 SK |
1155 | dprintk("RPC: sending pipefs UMOUNT notification for net %p%s\n", net, |
1156 | NET_NAME(net)); | |
2d00131a SK |
1157 | blocking_notifier_call_chain(&rpc_pipefs_notifier_list, |
1158 | RPC_PIPEFS_UMOUNT, | |
1159 | sb); | |
021c68de SK |
1160 | kill_litter_super(sb); |
1161 | } | |
1162 | ||
1da177e4 LT |
1163 | static struct file_system_type rpc_pipe_fs_type = { |
1164 | .owner = THIS_MODULE, | |
1165 | .name = "rpc_pipefs", | |
fc14f2fe | 1166 | .mount = rpc_mount, |
021c68de | 1167 | .kill_sb = rpc_kill_sb, |
1da177e4 LT |
1168 | }; |
1169 | ||
1170 | static void | |
51cc5068 | 1171 | init_once(void *foo) |
1da177e4 LT |
1172 | { |
1173 | struct rpc_inode *rpci = (struct rpc_inode *) foo; | |
1174 | ||
a35afb83 CL |
1175 | inode_init_once(&rpci->vfs_inode); |
1176 | rpci->private = NULL; | |
ba9e0975 | 1177 | rpci->pipe = NULL; |
1da177e4 LT |
1178 | } |
1179 | ||
1180 | int register_rpc_pipefs(void) | |
1181 | { | |
5bd5f581 AM |
1182 | int err; |
1183 | ||
1da177e4 | 1184 | rpc_inode_cachep = kmem_cache_create("rpc_inode_cache", |
fffb60f9 PJ |
1185 | sizeof(struct rpc_inode), |
1186 | 0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| | |
1187 | SLAB_MEM_SPREAD), | |
20c2df83 | 1188 | init_once); |
1da177e4 LT |
1189 | if (!rpc_inode_cachep) |
1190 | return -ENOMEM; | |
80df9d20 SK |
1191 | err = rpc_clients_notifier_register(); |
1192 | if (err) | |
1193 | goto err_notifier; | |
5bd5f581 | 1194 | err = register_filesystem(&rpc_pipe_fs_type); |
80df9d20 SK |
1195 | if (err) |
1196 | goto err_register; | |
1da177e4 | 1197 | return 0; |
80df9d20 SK |
1198 | |
1199 | err_register: | |
1200 | rpc_clients_notifier_unregister(); | |
1201 | err_notifier: | |
1202 | kmem_cache_destroy(rpc_inode_cachep); | |
1203 | return err; | |
1da177e4 LT |
1204 | } |
1205 | ||
1206 | void unregister_rpc_pipefs(void) | |
1207 | { | |
80df9d20 | 1208 | rpc_clients_notifier_unregister(); |
1a1d92c1 | 1209 | kmem_cache_destroy(rpc_inode_cachep); |
1da177e4 LT |
1210 | unregister_filesystem(&rpc_pipe_fs_type); |
1211 | } | |
dcbf8c30 MS |
1212 | |
1213 | /* Make 'mount -t rpc_pipefs ...' autoload this module. */ | |
1214 | MODULE_ALIAS("rpc_pipefs"); |