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> |
1da177e4 LT |
20 | |
21 | #include <asm/ioctls.h> | |
1da177e4 LT |
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 | ||
1da177e4 LT |
40 | static struct file_system_type rpc_pipe_fs_type; |
41 | ||
42 | ||
e18b890b | 43 | static struct kmem_cache *rpc_inode_cachep __read_mostly; |
1da177e4 LT |
44 | |
45 | #define RPC_UPCALL_TIMEOUT (30*HZ) | |
46 | ||
2d00131a SK |
47 | static BLOCKING_NOTIFIER_HEAD(rpc_pipefs_notifier_list); |
48 | ||
49 | int rpc_pipefs_notifier_register(struct notifier_block *nb) | |
50 | { | |
51 | return blocking_notifier_chain_cond_register(&rpc_pipefs_notifier_list, nb); | |
52 | } | |
53 | EXPORT_SYMBOL_GPL(rpc_pipefs_notifier_register); | |
54 | ||
55 | void rpc_pipefs_notifier_unregister(struct notifier_block *nb) | |
56 | { | |
57 | blocking_notifier_chain_unregister(&rpc_pipefs_notifier_list, nb); | |
58 | } | |
59 | EXPORT_SYMBOL_GPL(rpc_pipefs_notifier_unregister); | |
60 | ||
591ad7fe | 61 | static void rpc_purge_list(wait_queue_head_t *waitq, struct list_head *head, |
9842ef35 | 62 | void (*destroy_msg)(struct rpc_pipe_msg *), int err) |
1da177e4 | 63 | { |
1da177e4 LT |
64 | struct rpc_pipe_msg *msg; |
65 | ||
9842ef35 TM |
66 | if (list_empty(head)) |
67 | return; | |
68 | do { | |
b3eb67a2 | 69 | msg = list_entry(head->next, struct rpc_pipe_msg, list); |
5a67657a | 70 | list_del_init(&msg->list); |
1da177e4 | 71 | msg->errno = err; |
b3eb67a2 | 72 | destroy_msg(msg); |
9842ef35 | 73 | } while (!list_empty(head)); |
591ad7fe | 74 | wake_up(waitq); |
1da177e4 LT |
75 | } |
76 | ||
77 | static void | |
65f27f38 | 78 | rpc_timeout_upcall_queue(struct work_struct *work) |
1da177e4 | 79 | { |
9842ef35 | 80 | LIST_HEAD(free_list); |
ba9e0975 SK |
81 | struct rpc_pipe *pipe = |
82 | container_of(work, struct rpc_pipe, queue_timeout.work); | |
9842ef35 | 83 | void (*destroy_msg)(struct rpc_pipe_msg *); |
591ad7fe | 84 | struct dentry *dentry; |
1da177e4 | 85 | |
ba9e0975 | 86 | spin_lock(&pipe->lock); |
ba9e0975 SK |
87 | destroy_msg = pipe->ops->destroy_msg; |
88 | if (pipe->nreaders == 0) { | |
89 | list_splice_init(&pipe->pipe, &free_list); | |
90 | pipe->pipelen = 0; | |
9842ef35 | 91 | } |
591ad7fe | 92 | dentry = dget(pipe->dentry); |
ba9e0975 | 93 | spin_unlock(&pipe->lock); |
591ad7fe SK |
94 | if (dentry) { |
95 | rpc_purge_list(&RPC_I(dentry->d_inode)->waitq, | |
96 | &free_list, destroy_msg, -ETIMEDOUT); | |
97 | dput(dentry); | |
98 | } | |
1da177e4 LT |
99 | } |
100 | ||
c1225158 PT |
101 | ssize_t rpc_pipe_generic_upcall(struct file *filp, struct rpc_pipe_msg *msg, |
102 | char __user *dst, size_t buflen) | |
103 | { | |
104 | char *data = (char *)msg->data + msg->copied; | |
105 | size_t mlen = min(msg->len - msg->copied, buflen); | |
106 | unsigned long left; | |
107 | ||
108 | left = copy_to_user(dst, data, mlen); | |
109 | if (left == mlen) { | |
110 | msg->errno = -EFAULT; | |
111 | return -EFAULT; | |
112 | } | |
113 | ||
114 | mlen -= left; | |
115 | msg->copied += mlen; | |
116 | msg->errno = 0; | |
117 | return mlen; | |
118 | } | |
119 | EXPORT_SYMBOL_GPL(rpc_pipe_generic_upcall); | |
120 | ||
93a44a75 | 121 | /** |
1a5778aa | 122 | * rpc_queue_upcall - queue an upcall message to userspace |
93a44a75 BF |
123 | * @inode: inode of upcall pipe on which to queue given message |
124 | * @msg: message to queue | |
125 | * | |
126 | * Call with an @inode created by rpc_mkpipe() to queue an upcall. | |
127 | * A userspace process may then later read the upcall by performing a | |
128 | * read on an open file for this inode. It is up to the caller to | |
129 | * initialize the fields of @msg (other than @msg->list) appropriately. | |
130 | */ | |
1da177e4 | 131 | int |
d706ed1f | 132 | rpc_queue_upcall(struct rpc_pipe *pipe, struct rpc_pipe_msg *msg) |
1da177e4 | 133 | { |
6070fe6f | 134 | int res = -EPIPE; |
591ad7fe | 135 | struct dentry *dentry; |
1da177e4 | 136 | |
d0fe13ba | 137 | spin_lock(&pipe->lock); |
d0fe13ba SK |
138 | if (pipe->nreaders) { |
139 | list_add_tail(&msg->list, &pipe->pipe); | |
140 | pipe->pipelen += msg->len; | |
6070fe6f | 141 | res = 0; |
d0fe13ba SK |
142 | } else if (pipe->flags & RPC_PIPE_WAIT_FOR_OPEN) { |
143 | if (list_empty(&pipe->pipe)) | |
24c5d9d7 | 144 | queue_delayed_work(rpciod_workqueue, |
d0fe13ba | 145 | &pipe->queue_timeout, |
1da177e4 | 146 | RPC_UPCALL_TIMEOUT); |
d0fe13ba SK |
147 | list_add_tail(&msg->list, &pipe->pipe); |
148 | pipe->pipelen += msg->len; | |
6070fe6f TM |
149 | res = 0; |
150 | } | |
591ad7fe | 151 | dentry = dget(pipe->dentry); |
d0fe13ba | 152 | spin_unlock(&pipe->lock); |
591ad7fe SK |
153 | if (dentry) { |
154 | wake_up(&RPC_I(dentry->d_inode)->waitq); | |
155 | dput(dentry); | |
156 | } | |
1da177e4 LT |
157 | return res; |
158 | } | |
468039ee | 159 | EXPORT_SYMBOL_GPL(rpc_queue_upcall); |
1da177e4 | 160 | |
6070fe6f TM |
161 | static inline void |
162 | rpc_inode_setowner(struct inode *inode, void *private) | |
163 | { | |
164 | RPC_I(inode)->private = private; | |
165 | } | |
166 | ||
1da177e4 LT |
167 | static void |
168 | rpc_close_pipes(struct inode *inode) | |
169 | { | |
ba9e0975 | 170 | struct rpc_pipe *pipe = RPC_I(inode)->pipe; |
e712804a | 171 | int need_release; |
ad6b1340 | 172 | LIST_HEAD(free_list); |
1da177e4 | 173 | |
1b1dcc1b | 174 | mutex_lock(&inode->i_mutex); |
ad6b1340 SK |
175 | spin_lock(&pipe->lock); |
176 | need_release = pipe->nreaders != 0 || pipe->nwriters != 0; | |
177 | pipe->nreaders = 0; | |
178 | list_splice_init(&pipe->in_upcall, &free_list); | |
179 | list_splice_init(&pipe->pipe, &free_list); | |
180 | pipe->pipelen = 0; | |
181 | pipe->dentry = NULL; | |
182 | spin_unlock(&pipe->lock); | |
591ad7fe | 183 | rpc_purge_list(&RPC_I(inode)->waitq, &free_list, pipe->ops->destroy_msg, -EPIPE); |
ad6b1340 SK |
184 | pipe->nwriters = 0; |
185 | if (need_release && pipe->ops->release_pipe) | |
186 | pipe->ops->release_pipe(inode); | |
187 | cancel_delayed_work_sync(&pipe->queue_timeout); | |
6070fe6f | 188 | rpc_inode_setowner(inode, NULL); |
2c9030ee | 189 | RPC_I(inode)->pipe = NULL; |
1b1dcc1b | 190 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
191 | } |
192 | ||
1da177e4 LT |
193 | static struct inode * |
194 | rpc_alloc_inode(struct super_block *sb) | |
195 | { | |
196 | struct rpc_inode *rpci; | |
e94b1766 | 197 | rpci = (struct rpc_inode *)kmem_cache_alloc(rpc_inode_cachep, GFP_KERNEL); |
1da177e4 LT |
198 | if (!rpci) |
199 | return NULL; | |
200 | return &rpci->vfs_inode; | |
201 | } | |
202 | ||
203 | static void | |
fa0d7e3d | 204 | rpc_i_callback(struct rcu_head *head) |
1da177e4 | 205 | { |
fa0d7e3d | 206 | struct inode *inode = container_of(head, struct inode, i_rcu); |
1da177e4 LT |
207 | kmem_cache_free(rpc_inode_cachep, RPC_I(inode)); |
208 | } | |
209 | ||
fa0d7e3d NP |
210 | static void |
211 | rpc_destroy_inode(struct inode *inode) | |
212 | { | |
213 | call_rcu(&inode->i_rcu, rpc_i_callback); | |
214 | } | |
215 | ||
1da177e4 LT |
216 | static int |
217 | rpc_pipe_open(struct inode *inode, struct file *filp) | |
218 | { | |
2c9030ee | 219 | struct rpc_pipe *pipe; |
c3810608 | 220 | int first_open; |
1da177e4 LT |
221 | int res = -ENXIO; |
222 | ||
1b1dcc1b | 223 | mutex_lock(&inode->i_mutex); |
2c9030ee SK |
224 | pipe = RPC_I(inode)->pipe; |
225 | if (pipe == NULL) | |
c3810608 | 226 | goto out; |
d0fe13ba SK |
227 | first_open = pipe->nreaders == 0 && pipe->nwriters == 0; |
228 | if (first_open && pipe->ops->open_pipe) { | |
229 | res = pipe->ops->open_pipe(inode); | |
c3810608 BF |
230 | if (res) |
231 | goto out; | |
1da177e4 | 232 | } |
c3810608 | 233 | if (filp->f_mode & FMODE_READ) |
d0fe13ba | 234 | pipe->nreaders++; |
c3810608 | 235 | if (filp->f_mode & FMODE_WRITE) |
d0fe13ba | 236 | pipe->nwriters++; |
c3810608 BF |
237 | res = 0; |
238 | out: | |
1b1dcc1b | 239 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
240 | return res; |
241 | } | |
242 | ||
243 | static int | |
244 | rpc_pipe_release(struct inode *inode, struct file *filp) | |
245 | { | |
2c9030ee | 246 | struct rpc_pipe *pipe; |
1da177e4 | 247 | struct rpc_pipe_msg *msg; |
e712804a | 248 | int last_close; |
1da177e4 | 249 | |
1b1dcc1b | 250 | mutex_lock(&inode->i_mutex); |
2c9030ee SK |
251 | pipe = RPC_I(inode)->pipe; |
252 | if (pipe == 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); | |
591ad7fe | 272 | rpc_purge_list(&RPC_I(inode)->waitq, &free_list, |
ba9e0975 | 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; |
2c9030ee | 288 | struct rpc_pipe *pipe; |
1da177e4 LT |
289 | struct rpc_pipe_msg *msg; |
290 | int res = 0; | |
291 | ||
1b1dcc1b | 292 | mutex_lock(&inode->i_mutex); |
2c9030ee SK |
293 | pipe = RPC_I(inode)->pipe; |
294 | if (pipe == 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; |
1da177e4 LT |
332 | int res; |
333 | ||
1b1dcc1b | 334 | mutex_lock(&inode->i_mutex); |
1da177e4 | 335 | res = -EPIPE; |
2c9030ee SK |
336 | if (RPC_I(inode)->pipe != NULL) |
337 | res = RPC_I(inode)->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 | { | |
591ad7fe SK |
345 | struct inode *inode = filp->f_path.dentry->d_inode; |
346 | struct rpc_inode *rpci = RPC_I(inode); | |
347 | unsigned int mask = POLLOUT | POLLWRNORM; | |
1da177e4 | 348 | |
591ad7fe | 349 | poll_wait(filp, &rpci->waitq, wait); |
1da177e4 | 350 | |
591ad7fe SK |
351 | mutex_lock(&inode->i_mutex); |
352 | if (rpci->pipe == NULL) | |
1da177e4 | 353 | mask |= POLLERR | POLLHUP; |
591ad7fe | 354 | else if (filp->private_data || !list_empty(&rpci->pipe->pipe)) |
1da177e4 | 355 | mask |= POLLIN | POLLRDNORM; |
591ad7fe | 356 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
357 | return mask; |
358 | } | |
359 | ||
a6f8dbc6 AB |
360 | static long |
361 | rpc_pipe_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) | |
1da177e4 | 362 | { |
a6f8dbc6 | 363 | struct inode *inode = filp->f_path.dentry->d_inode; |
2c9030ee | 364 | struct rpc_pipe *pipe; |
1da177e4 LT |
365 | int len; |
366 | ||
367 | switch (cmd) { | |
368 | case FIONREAD: | |
2c9030ee SK |
369 | mutex_lock(&inode->i_mutex); |
370 | pipe = RPC_I(inode)->pipe; | |
371 | if (pipe == NULL) { | |
372 | mutex_unlock(&inode->i_mutex); | |
1da177e4 | 373 | return -EPIPE; |
a6f8dbc6 | 374 | } |
2c9030ee | 375 | spin_lock(&pipe->lock); |
d0fe13ba | 376 | len = pipe->pipelen; |
1da177e4 LT |
377 | if (filp->private_data) { |
378 | struct rpc_pipe_msg *msg; | |
655b5bb4 | 379 | msg = filp->private_data; |
1da177e4 LT |
380 | len += msg->len - msg->copied; |
381 | } | |
d0fe13ba | 382 | spin_unlock(&pipe->lock); |
2c9030ee | 383 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
384 | return put_user(len, (int __user *)arg); |
385 | default: | |
386 | return -EINVAL; | |
387 | } | |
388 | } | |
389 | ||
da7071d7 | 390 | static const struct file_operations rpc_pipe_fops = { |
1da177e4 LT |
391 | .owner = THIS_MODULE, |
392 | .llseek = no_llseek, | |
393 | .read = rpc_pipe_read, | |
394 | .write = rpc_pipe_write, | |
395 | .poll = rpc_pipe_poll, | |
674b604c | 396 | .unlocked_ioctl = rpc_pipe_ioctl, |
1da177e4 LT |
397 | .open = rpc_pipe_open, |
398 | .release = rpc_pipe_release, | |
399 | }; | |
400 | ||
401 | static int | |
402 | rpc_show_info(struct seq_file *m, void *v) | |
403 | { | |
404 | struct rpc_clnt *clnt = m->private; | |
405 | ||
2446ab60 | 406 | rcu_read_lock(); |
1da177e4 LT |
407 | seq_printf(m, "RPC server: %s\n", clnt->cl_server); |
408 | seq_printf(m, "service: %s (%d) version %d\n", clnt->cl_protname, | |
409 | clnt->cl_prog, clnt->cl_vers); | |
e7f78657 CL |
410 | seq_printf(m, "address: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_ADDR)); |
411 | seq_printf(m, "protocol: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PROTO)); | |
bf19aace | 412 | seq_printf(m, "port: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PORT)); |
2446ab60 | 413 | rcu_read_unlock(); |
1da177e4 LT |
414 | return 0; |
415 | } | |
416 | ||
417 | static int | |
418 | rpc_info_open(struct inode *inode, struct file *file) | |
419 | { | |
006abe88 | 420 | struct rpc_clnt *clnt = NULL; |
1da177e4 LT |
421 | int ret = single_open(file, rpc_show_info, NULL); |
422 | ||
423 | if (!ret) { | |
424 | struct seq_file *m = file->private_data; | |
006abe88 TM |
425 | |
426 | spin_lock(&file->f_path.dentry->d_lock); | |
427 | if (!d_unhashed(file->f_path.dentry)) | |
428 | clnt = RPC_I(inode)->private; | |
429 | if (clnt != NULL && atomic_inc_not_zero(&clnt->cl_count)) { | |
430 | spin_unlock(&file->f_path.dentry->d_lock); | |
1da177e4 LT |
431 | m->private = clnt; |
432 | } else { | |
006abe88 | 433 | spin_unlock(&file->f_path.dentry->d_lock); |
1da177e4 LT |
434 | single_release(inode, file); |
435 | ret = -EINVAL; | |
436 | } | |
1da177e4 LT |
437 | } |
438 | return ret; | |
439 | } | |
440 | ||
441 | static int | |
442 | rpc_info_release(struct inode *inode, struct file *file) | |
443 | { | |
444 | struct seq_file *m = file->private_data; | |
445 | struct rpc_clnt *clnt = (struct rpc_clnt *)m->private; | |
446 | ||
447 | if (clnt) | |
448 | rpc_release_client(clnt); | |
449 | return single_release(inode, file); | |
450 | } | |
451 | ||
da7071d7 | 452 | static const struct file_operations rpc_info_operations = { |
1da177e4 LT |
453 | .owner = THIS_MODULE, |
454 | .open = rpc_info_open, | |
455 | .read = seq_read, | |
456 | .llseek = seq_lseek, | |
457 | .release = rpc_info_release, | |
458 | }; | |
459 | ||
460 | ||
1da177e4 LT |
461 | /* |
462 | * Description of fs contents. | |
463 | */ | |
464 | struct rpc_filelist { | |
ac6fecee | 465 | const char *name; |
99ac48f5 | 466 | const struct file_operations *i_fop; |
7364af6a | 467 | umode_t mode; |
1da177e4 LT |
468 | }; |
469 | ||
fe15ce44 | 470 | static int rpc_delete_dentry(const struct dentry *dentry) |
62e1761c TM |
471 | { |
472 | return 1; | |
473 | } | |
474 | ||
3ba13d17 | 475 | static const struct dentry_operations rpc_dentry_operations = { |
62e1761c TM |
476 | .d_delete = rpc_delete_dentry, |
477 | }; | |
478 | ||
1da177e4 | 479 | static struct inode * |
7364af6a | 480 | rpc_get_inode(struct super_block *sb, umode_t mode) |
1da177e4 LT |
481 | { |
482 | struct inode *inode = new_inode(sb); | |
483 | if (!inode) | |
484 | return NULL; | |
85fe4025 | 485 | inode->i_ino = get_next_ino(); |
1da177e4 | 486 | inode->i_mode = mode; |
1da177e4 | 487 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
89f0e4fe JP |
488 | switch (mode & S_IFMT) { |
489 | case S_IFDIR: | |
490 | inode->i_fop = &simple_dir_operations; | |
491 | inode->i_op = &simple_dir_inode_operations; | |
492 | inc_nlink(inode); | |
493 | default: | |
494 | break; | |
1da177e4 LT |
495 | } |
496 | return inode; | |
497 | } | |
498 | ||
7589806e TM |
499 | static int __rpc_create_common(struct inode *dir, struct dentry *dentry, |
500 | umode_t mode, | |
501 | const struct file_operations *i_fop, | |
502 | void *private) | |
503 | { | |
504 | struct inode *inode; | |
505 | ||
beb0f0a9 | 506 | d_drop(dentry); |
7589806e TM |
507 | inode = rpc_get_inode(dir->i_sb, mode); |
508 | if (!inode) | |
509 | goto out_err; | |
510 | inode->i_ino = iunique(dir->i_sb, 100); | |
511 | if (i_fop) | |
512 | inode->i_fop = i_fop; | |
513 | if (private) | |
514 | rpc_inode_setowner(inode, private); | |
515 | d_add(dentry, inode); | |
516 | return 0; | |
517 | out_err: | |
518 | printk(KERN_WARNING "%s: %s failed to allocate inode for dentry %s\n", | |
519 | __FILE__, __func__, dentry->d_name.name); | |
520 | dput(dentry); | |
521 | return -ENOMEM; | |
522 | } | |
523 | ||
ac6fecee TM |
524 | static int __rpc_create(struct inode *dir, struct dentry *dentry, |
525 | umode_t mode, | |
526 | const struct file_operations *i_fop, | |
527 | void *private) | |
528 | { | |
529 | int err; | |
530 | ||
531 | err = __rpc_create_common(dir, dentry, S_IFREG | mode, i_fop, private); | |
532 | if (err) | |
533 | return err; | |
534 | fsnotify_create(dir, dentry); | |
535 | return 0; | |
536 | } | |
537 | ||
7589806e TM |
538 | static int __rpc_mkdir(struct inode *dir, struct dentry *dentry, |
539 | umode_t mode, | |
540 | const struct file_operations *i_fop, | |
541 | void *private) | |
542 | { | |
543 | int err; | |
544 | ||
545 | err = __rpc_create_common(dir, dentry, S_IFDIR | mode, i_fop, private); | |
546 | if (err) | |
547 | return err; | |
548 | inc_nlink(dir); | |
549 | fsnotify_mkdir(dir, dentry); | |
550 | return 0; | |
551 | } | |
552 | ||
ba9e0975 SK |
553 | static void |
554 | init_pipe(struct rpc_pipe *pipe) | |
555 | { | |
556 | pipe->nreaders = 0; | |
557 | pipe->nwriters = 0; | |
558 | INIT_LIST_HEAD(&pipe->in_upcall); | |
559 | INIT_LIST_HEAD(&pipe->in_downcall); | |
560 | INIT_LIST_HEAD(&pipe->pipe); | |
561 | pipe->pipelen = 0; | |
ba9e0975 SK |
562 | INIT_DELAYED_WORK(&pipe->queue_timeout, |
563 | rpc_timeout_upcall_queue); | |
564 | pipe->ops = NULL; | |
565 | spin_lock_init(&pipe->lock); | |
c239d83b SK |
566 | pipe->dentry = NULL; |
567 | } | |
ba9e0975 | 568 | |
c239d83b SK |
569 | void rpc_destroy_pipe_data(struct rpc_pipe *pipe) |
570 | { | |
571 | kfree(pipe); | |
ba9e0975 | 572 | } |
c239d83b | 573 | EXPORT_SYMBOL_GPL(rpc_destroy_pipe_data); |
ba9e0975 | 574 | |
c239d83b | 575 | struct rpc_pipe *rpc_mkpipe_data(const struct rpc_pipe_ops *ops, int flags) |
7589806e | 576 | { |
ba9e0975 | 577 | struct rpc_pipe *pipe; |
7589806e | 578 | |
ba9e0975 SK |
579 | pipe = kzalloc(sizeof(struct rpc_pipe), GFP_KERNEL); |
580 | if (!pipe) | |
c239d83b | 581 | return ERR_PTR(-ENOMEM); |
ba9e0975 | 582 | init_pipe(pipe); |
c239d83b SK |
583 | pipe->ops = ops; |
584 | pipe->flags = flags; | |
585 | return pipe; | |
586 | } | |
587 | EXPORT_SYMBOL_GPL(rpc_mkpipe_data); | |
588 | ||
589 | static int __rpc_mkpipe_dentry(struct inode *dir, struct dentry *dentry, | |
590 | umode_t mode, | |
591 | const struct file_operations *i_fop, | |
592 | void *private, | |
593 | struct rpc_pipe *pipe) | |
594 | { | |
595 | struct rpc_inode *rpci; | |
596 | int err; | |
597 | ||
7589806e | 598 | err = __rpc_create_common(dir, dentry, S_IFIFO | mode, i_fop, private); |
c239d83b | 599 | if (err) |
7589806e TM |
600 | return err; |
601 | rpci = RPC_I(dentry->d_inode); | |
7589806e | 602 | rpci->private = private; |
ba9e0975 | 603 | rpci->pipe = pipe; |
7589806e TM |
604 | fsnotify_create(dir, dentry); |
605 | return 0; | |
606 | } | |
607 | ||
ac6fecee TM |
608 | static int __rpc_rmdir(struct inode *dir, struct dentry *dentry) |
609 | { | |
610 | int ret; | |
611 | ||
612 | dget(dentry); | |
613 | ret = simple_rmdir(dir, dentry); | |
614 | d_delete(dentry); | |
615 | dput(dentry); | |
616 | return ret; | |
617 | } | |
618 | ||
eee17325 SK |
619 | int rpc_rmdir(struct dentry *dentry) |
620 | { | |
621 | struct dentry *parent; | |
622 | struct inode *dir; | |
623 | int error; | |
624 | ||
625 | parent = dget_parent(dentry); | |
626 | dir = parent->d_inode; | |
627 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); | |
628 | error = __rpc_rmdir(dir, dentry); | |
629 | mutex_unlock(&dir->i_mutex); | |
630 | dput(parent); | |
631 | return error; | |
632 | } | |
633 | EXPORT_SYMBOL_GPL(rpc_rmdir); | |
634 | ||
810d90bc TM |
635 | static int __rpc_unlink(struct inode *dir, struct dentry *dentry) |
636 | { | |
637 | int ret; | |
638 | ||
639 | dget(dentry); | |
640 | ret = simple_unlink(dir, dentry); | |
641 | d_delete(dentry); | |
642 | dput(dentry); | |
643 | return ret; | |
644 | } | |
645 | ||
646 | static int __rpc_rmpipe(struct inode *dir, struct dentry *dentry) | |
647 | { | |
648 | struct inode *inode = dentry->d_inode; | |
810d90bc | 649 | |
810d90bc TM |
650 | rpc_close_pipes(inode); |
651 | return __rpc_unlink(dir, dentry); | |
652 | } | |
653 | ||
5bff0386 | 654 | static struct dentry *__rpc_lookup_create_exclusive(struct dentry *parent, |
cfeaa4a3 TM |
655 | struct qstr *name) |
656 | { | |
657 | struct dentry *dentry; | |
658 | ||
659 | dentry = d_lookup(parent, name); | |
660 | if (!dentry) { | |
661 | dentry = d_alloc(parent, name); | |
5bff0386 SK |
662 | if (!dentry) |
663 | return ERR_PTR(-ENOMEM); | |
cfeaa4a3 | 664 | } |
5bff0386 | 665 | if (dentry->d_inode == NULL) { |
fb045adb | 666 | d_set_d_op(dentry, &rpc_dentry_operations); |
cfeaa4a3 | 667 | return dentry; |
5bff0386 | 668 | } |
cfeaa4a3 TM |
669 | dput(dentry); |
670 | return ERR_PTR(-EEXIST); | |
671 | } | |
672 | ||
1da177e4 LT |
673 | /* |
674 | * FIXME: This probably has races. | |
675 | */ | |
ac6fecee TM |
676 | static void __rpc_depopulate(struct dentry *parent, |
677 | const struct rpc_filelist *files, | |
678 | int start, int eof) | |
1da177e4 LT |
679 | { |
680 | struct inode *dir = parent->d_inode; | |
ac6fecee TM |
681 | struct dentry *dentry; |
682 | struct qstr name; | |
683 | int i; | |
1da177e4 | 684 | |
ac6fecee TM |
685 | for (i = start; i < eof; i++) { |
686 | name.name = files[i].name; | |
687 | name.len = strlen(files[i].name); | |
688 | name.hash = full_name_hash(name.name, name.len); | |
689 | dentry = d_lookup(parent, &name); | |
690 | ||
691 | if (dentry == NULL) | |
62e1761c | 692 | continue; |
ac6fecee TM |
693 | if (dentry->d_inode == NULL) |
694 | goto next; | |
695 | switch (dentry->d_inode->i_mode & S_IFMT) { | |
696 | default: | |
697 | BUG(); | |
698 | case S_IFREG: | |
699 | __rpc_unlink(dir, dentry); | |
1da177e4 | 700 | break; |
ac6fecee TM |
701 | case S_IFDIR: |
702 | __rpc_rmdir(dir, dentry); | |
703 | } | |
704 | next: | |
705 | dput(dentry); | |
1da177e4 | 706 | } |
ac6fecee TM |
707 | } |
708 | ||
709 | static void rpc_depopulate(struct dentry *parent, | |
710 | const struct rpc_filelist *files, | |
711 | int start, int eof) | |
712 | { | |
713 | struct inode *dir = parent->d_inode; | |
714 | ||
715 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_CHILD); | |
716 | __rpc_depopulate(parent, files, start, eof); | |
1b1dcc1b | 717 | mutex_unlock(&dir->i_mutex); |
1da177e4 LT |
718 | } |
719 | ||
ac6fecee TM |
720 | static int rpc_populate(struct dentry *parent, |
721 | const struct rpc_filelist *files, | |
722 | int start, int eof, | |
723 | void *private) | |
1da177e4 | 724 | { |
ac6fecee | 725 | struct inode *dir = parent->d_inode; |
1da177e4 | 726 | struct dentry *dentry; |
ac6fecee | 727 | int i, err; |
1da177e4 | 728 | |
1b1dcc1b | 729 | mutex_lock(&dir->i_mutex); |
1da177e4 | 730 | for (i = start; i < eof; i++) { |
ac6fecee TM |
731 | struct qstr q; |
732 | ||
733 | q.name = files[i].name; | |
734 | q.len = strlen(files[i].name); | |
735 | q.hash = full_name_hash(q.name, q.len); | |
736 | dentry = __rpc_lookup_create_exclusive(parent, &q); | |
737 | err = PTR_ERR(dentry); | |
738 | if (IS_ERR(dentry)) | |
1da177e4 | 739 | goto out_bad; |
ac6fecee TM |
740 | switch (files[i].mode & S_IFMT) { |
741 | default: | |
742 | BUG(); | |
743 | case S_IFREG: | |
744 | err = __rpc_create(dir, dentry, | |
745 | files[i].mode, | |
746 | files[i].i_fop, | |
747 | private); | |
748 | break; | |
749 | case S_IFDIR: | |
750 | err = __rpc_mkdir(dir, dentry, | |
751 | files[i].mode, | |
752 | NULL, | |
753 | private); | |
1da177e4 | 754 | } |
ac6fecee TM |
755 | if (err != 0) |
756 | goto out_bad; | |
1da177e4 | 757 | } |
1b1dcc1b | 758 | mutex_unlock(&dir->i_mutex); |
1da177e4 LT |
759 | return 0; |
760 | out_bad: | |
ac6fecee | 761 | __rpc_depopulate(parent, files, start, eof); |
1b1dcc1b | 762 | mutex_unlock(&dir->i_mutex); |
1da177e4 | 763 | printk(KERN_WARNING "%s: %s failed to populate directory %s\n", |
0dc47877 | 764 | __FILE__, __func__, parent->d_name.name); |
ac6fecee | 765 | return err; |
f134585a | 766 | } |
1da177e4 | 767 | |
e57aed77 TM |
768 | static struct dentry *rpc_mkdir_populate(struct dentry *parent, |
769 | struct qstr *name, umode_t mode, void *private, | |
770 | int (*populate)(struct dentry *, void *), void *args_populate) | |
f134585a | 771 | { |
f134585a | 772 | struct dentry *dentry; |
7d59d1e8 | 773 | struct inode *dir = parent->d_inode; |
f134585a TM |
774 | int error; |
775 | ||
7d59d1e8 TM |
776 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); |
777 | dentry = __rpc_lookup_create_exclusive(parent, name); | |
f134585a | 778 | if (IS_ERR(dentry)) |
7d59d1e8 TM |
779 | goto out; |
780 | error = __rpc_mkdir(dir, dentry, mode, NULL, private); | |
7589806e TM |
781 | if (error != 0) |
782 | goto out_err; | |
e57aed77 TM |
783 | if (populate != NULL) { |
784 | error = populate(dentry, args_populate); | |
785 | if (error) | |
786 | goto err_rmdir; | |
787 | } | |
f134585a | 788 | out: |
1b1dcc1b | 789 | mutex_unlock(&dir->i_mutex); |
5c3e985a | 790 | return dentry; |
ac6fecee | 791 | err_rmdir: |
f134585a | 792 | __rpc_rmdir(dir, dentry); |
7589806e | 793 | out_err: |
f134585a TM |
794 | dentry = ERR_PTR(error); |
795 | goto out; | |
1da177e4 LT |
796 | } |
797 | ||
e57aed77 TM |
798 | static int rpc_rmdir_depopulate(struct dentry *dentry, |
799 | void (*depopulate)(struct dentry *)) | |
1da177e4 | 800 | { |
dff02cc1 | 801 | struct dentry *parent; |
f134585a TM |
802 | struct inode *dir; |
803 | int error; | |
278c995c | 804 | |
dff02cc1 TM |
805 | parent = dget_parent(dentry); |
806 | dir = parent->d_inode; | |
c6573c29 | 807 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); |
e57aed77 TM |
808 | if (depopulate != NULL) |
809 | depopulate(dentry); | |
f134585a | 810 | error = __rpc_rmdir(dir, dentry); |
1b1dcc1b | 811 | mutex_unlock(&dir->i_mutex); |
dff02cc1 | 812 | dput(parent); |
f134585a | 813 | return error; |
1da177e4 LT |
814 | } |
815 | ||
93a44a75 BF |
816 | /** |
817 | * rpc_mkpipe - make an rpc_pipefs file for kernel<->userspace communication | |
818 | * @parent: dentry of directory to create new "pipe" in | |
819 | * @name: name of pipe | |
820 | * @private: private data to associate with the pipe, for the caller's use | |
821 | * @ops: operations defining the behavior of the pipe: upcall, downcall, | |
c3810608 | 822 | * release_pipe, open_pipe, and destroy_msg. |
d0fe13ba | 823 | * @flags: rpc_pipe flags |
93a44a75 BF |
824 | * |
825 | * Data is made available for userspace to read by calls to | |
826 | * rpc_queue_upcall(). The actual reads will result in calls to | |
827 | * @ops->upcall, which will be called with the file pointer, | |
828 | * message, and userspace buffer to copy to. | |
829 | * | |
830 | * Writes can come at any time, and do not necessarily have to be | |
831 | * responses to upcalls. They will result in calls to @msg->downcall. | |
832 | * | |
833 | * The @private argument passed here will be available to all these methods | |
834 | * from the file pointer, via RPC_I(file->f_dentry->d_inode)->private. | |
835 | */ | |
c239d83b SK |
836 | struct dentry *rpc_mkpipe_dentry(struct dentry *parent, const char *name, |
837 | void *private, struct rpc_pipe *pipe) | |
1da177e4 | 838 | { |
1da177e4 | 839 | struct dentry *dentry; |
7589806e | 840 | struct inode *dir = parent->d_inode; |
7364af6a | 841 | umode_t umode = S_IFIFO | S_IRUSR | S_IWUSR; |
cfeaa4a3 | 842 | struct qstr q; |
7589806e | 843 | int err; |
7364af6a | 844 | |
c239d83b | 845 | if (pipe->ops->upcall == NULL) |
7364af6a | 846 | umode &= ~S_IRUGO; |
c239d83b | 847 | if (pipe->ops->downcall == NULL) |
7364af6a | 848 | umode &= ~S_IWUGO; |
1da177e4 | 849 | |
cfeaa4a3 TM |
850 | q.name = name; |
851 | q.len = strlen(name); | |
852 | q.hash = full_name_hash(q.name, q.len), | |
853 | ||
854 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); | |
5bff0386 | 855 | dentry = __rpc_lookup_create_exclusive(parent, &q); |
1da177e4 | 856 | if (IS_ERR(dentry)) |
cfeaa4a3 | 857 | goto out; |
c239d83b SK |
858 | err = __rpc_mkpipe_dentry(dir, dentry, umode, &rpc_pipe_fops, |
859 | private, pipe); | |
7589806e TM |
860 | if (err) |
861 | goto out_err; | |
f134585a | 862 | out: |
1b1dcc1b | 863 | mutex_unlock(&dir->i_mutex); |
5c3e985a | 864 | return dentry; |
7589806e TM |
865 | out_err: |
866 | dentry = ERR_PTR(err); | |
158998b6 | 867 | printk(KERN_WARNING "%s: %s() failed to create pipe %s/%s (errno = %d)\n", |
0dc47877 | 868 | __FILE__, __func__, parent->d_name.name, name, |
7589806e | 869 | err); |
f134585a | 870 | goto out; |
1da177e4 | 871 | } |
c239d83b | 872 | EXPORT_SYMBOL_GPL(rpc_mkpipe_dentry); |
1da177e4 | 873 | |
93a44a75 BF |
874 | /** |
875 | * rpc_unlink - remove a pipe | |
876 | * @dentry: dentry for the pipe, as returned from rpc_mkpipe | |
877 | * | |
878 | * After this call, lookups will no longer find the pipe, and any | |
879 | * attempts to read or write using preexisting opens of the pipe will | |
880 | * return -EPIPE. | |
881 | */ | |
f134585a | 882 | int |
5d67476f | 883 | rpc_unlink(struct dentry *dentry) |
1da177e4 | 884 | { |
5d67476f | 885 | struct dentry *parent; |
f134585a | 886 | struct inode *dir; |
5d67476f | 887 | int error = 0; |
1da177e4 | 888 | |
5d67476f TM |
889 | parent = dget_parent(dentry); |
890 | dir = parent->d_inode; | |
c6573c29 | 891 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); |
810d90bc | 892 | error = __rpc_rmpipe(dir, dentry); |
1b1dcc1b | 893 | mutex_unlock(&dir->i_mutex); |
5d67476f | 894 | dput(parent); |
f134585a | 895 | return error; |
1da177e4 | 896 | } |
468039ee | 897 | EXPORT_SYMBOL_GPL(rpc_unlink); |
1da177e4 | 898 | |
e57aed77 TM |
899 | enum { |
900 | RPCAUTH_info, | |
901 | RPCAUTH_EOF | |
902 | }; | |
903 | ||
904 | static const struct rpc_filelist authfiles[] = { | |
905 | [RPCAUTH_info] = { | |
906 | .name = "info", | |
907 | .i_fop = &rpc_info_operations, | |
908 | .mode = S_IFREG | S_IRUSR, | |
909 | }, | |
910 | }; | |
911 | ||
912 | static int rpc_clntdir_populate(struct dentry *dentry, void *private) | |
913 | { | |
914 | return rpc_populate(dentry, | |
915 | authfiles, RPCAUTH_info, RPCAUTH_EOF, | |
916 | private); | |
917 | } | |
918 | ||
919 | static void rpc_clntdir_depopulate(struct dentry *dentry) | |
920 | { | |
921 | rpc_depopulate(dentry, authfiles, RPCAUTH_info, RPCAUTH_EOF); | |
922 | } | |
923 | ||
7d59d1e8 TM |
924 | /** |
925 | * rpc_create_client_dir - Create a new rpc_client directory in rpc_pipefs | |
4111d4fd RD |
926 | * @dentry: dentry from the rpc_pipefs root to the new directory |
927 | * @name: &struct qstr for the name | |
7d59d1e8 TM |
928 | * @rpc_client: rpc client to associate with this directory |
929 | * | |
930 | * This creates a directory at the given @path associated with | |
931 | * @rpc_clnt, which will contain a file named "info" with some basic | |
932 | * information about the client, together with any "pipes" that may | |
933 | * later be created using rpc_mkpipe(). | |
934 | */ | |
23ac6581 | 935 | struct dentry *rpc_create_client_dir(struct dentry *dentry, |
e57aed77 TM |
936 | struct qstr *name, |
937 | struct rpc_clnt *rpc_client) | |
938 | { | |
939 | return rpc_mkdir_populate(dentry, name, S_IRUGO | S_IXUGO, NULL, | |
940 | rpc_clntdir_populate, rpc_client); | |
941 | } | |
942 | ||
943 | /** | |
944 | * rpc_remove_client_dir - Remove a directory created with rpc_create_client_dir() | |
80df9d20 | 945 | * @clnt: rpc client |
e57aed77 TM |
946 | */ |
947 | int rpc_remove_client_dir(struct dentry *dentry) | |
7d59d1e8 | 948 | { |
e57aed77 | 949 | return rpc_rmdir_depopulate(dentry, rpc_clntdir_depopulate); |
7d59d1e8 TM |
950 | } |
951 | ||
8854e82d TM |
952 | static const struct rpc_filelist cache_pipefs_files[3] = { |
953 | [0] = { | |
954 | .name = "channel", | |
955 | .i_fop = &cache_file_operations_pipefs, | |
96c61cbd | 956 | .mode = S_IFREG|S_IRUSR|S_IWUSR, |
8854e82d TM |
957 | }, |
958 | [1] = { | |
959 | .name = "content", | |
960 | .i_fop = &content_file_operations_pipefs, | |
961 | .mode = S_IFREG|S_IRUSR, | |
962 | }, | |
963 | [2] = { | |
964 | .name = "flush", | |
965 | .i_fop = &cache_flush_operations_pipefs, | |
966 | .mode = S_IFREG|S_IRUSR|S_IWUSR, | |
967 | }, | |
968 | }; | |
969 | ||
970 | static int rpc_cachedir_populate(struct dentry *dentry, void *private) | |
971 | { | |
972 | return rpc_populate(dentry, | |
973 | cache_pipefs_files, 0, 3, | |
974 | private); | |
975 | } | |
976 | ||
977 | static void rpc_cachedir_depopulate(struct dentry *dentry) | |
978 | { | |
979 | rpc_depopulate(dentry, cache_pipefs_files, 0, 3); | |
980 | } | |
981 | ||
982 | struct dentry *rpc_create_cache_dir(struct dentry *parent, struct qstr *name, | |
64f1426f | 983 | umode_t umode, struct cache_detail *cd) |
8854e82d TM |
984 | { |
985 | return rpc_mkdir_populate(parent, name, umode, NULL, | |
986 | rpc_cachedir_populate, cd); | |
987 | } | |
988 | ||
989 | void rpc_remove_cache_dir(struct dentry *dentry) | |
990 | { | |
991 | rpc_rmdir_depopulate(dentry, rpc_cachedir_depopulate); | |
992 | } | |
993 | ||
1da177e4 LT |
994 | /* |
995 | * populate the filesystem | |
996 | */ | |
b87221de | 997 | static const struct super_operations s_ops = { |
1da177e4 LT |
998 | .alloc_inode = rpc_alloc_inode, |
999 | .destroy_inode = rpc_destroy_inode, | |
1000 | .statfs = simple_statfs, | |
1001 | }; | |
1002 | ||
1003 | #define RPCAUTH_GSSMAGIC 0x67596969 | |
1004 | ||
bb156749 TM |
1005 | /* |
1006 | * We have a single directory with 1 node in it. | |
1007 | */ | |
1008 | enum { | |
1009 | RPCAUTH_lockd, | |
1010 | RPCAUTH_mount, | |
1011 | RPCAUTH_nfs, | |
1012 | RPCAUTH_portmap, | |
1013 | RPCAUTH_statd, | |
1014 | RPCAUTH_nfsd4_cb, | |
e571cbf1 | 1015 | RPCAUTH_cache, |
bb156749 TM |
1016 | RPCAUTH_RootEOF |
1017 | }; | |
1018 | ||
1019 | static const struct rpc_filelist files[] = { | |
1020 | [RPCAUTH_lockd] = { | |
1021 | .name = "lockd", | |
1022 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
1023 | }, | |
1024 | [RPCAUTH_mount] = { | |
1025 | .name = "mount", | |
1026 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
1027 | }, | |
1028 | [RPCAUTH_nfs] = { | |
1029 | .name = "nfs", | |
1030 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
1031 | }, | |
1032 | [RPCAUTH_portmap] = { | |
1033 | .name = "portmap", | |
1034 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
1035 | }, | |
1036 | [RPCAUTH_statd] = { | |
1037 | .name = "statd", | |
1038 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
1039 | }, | |
1040 | [RPCAUTH_nfsd4_cb] = { | |
1041 | .name = "nfsd4_cb", | |
1042 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
1043 | }, | |
e571cbf1 TM |
1044 | [RPCAUTH_cache] = { |
1045 | .name = "cache", | |
1046 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
1047 | }, | |
bb156749 TM |
1048 | }; |
1049 | ||
432eb1a5 SK |
1050 | /* |
1051 | * This call can be used only in RPC pipefs mount notification hooks. | |
1052 | */ | |
1053 | struct dentry *rpc_d_lookup_sb(const struct super_block *sb, | |
1054 | const unsigned char *dir_name) | |
1055 | { | |
1056 | struct qstr dir = { | |
1057 | .name = dir_name, | |
1058 | .len = strlen(dir_name), | |
1059 | .hash = full_name_hash(dir_name, strlen(dir_name)), | |
1060 | }; | |
1061 | ||
1062 | return d_lookup(sb->s_root, &dir); | |
1063 | } | |
1064 | EXPORT_SYMBOL_GPL(rpc_d_lookup_sb); | |
1065 | ||
c21a588f SK |
1066 | void rpc_pipefs_init_net(struct net *net) |
1067 | { | |
1068 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
1069 | ||
1070 | mutex_init(&sn->pipefs_sb_lock); | |
1071 | } | |
1072 | ||
1073 | /* | |
1074 | * This call will be used for per network namespace operations calls. | |
1075 | * Note: Function will be returned with pipefs_sb_lock taken if superblock was | |
1076 | * found. This lock have to be released by rpc_put_sb_net() when all operations | |
1077 | * will be completed. | |
1078 | */ | |
1079 | struct super_block *rpc_get_sb_net(const struct net *net) | |
1080 | { | |
1081 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
1082 | ||
1083 | mutex_lock(&sn->pipefs_sb_lock); | |
1084 | if (sn->pipefs_sb) | |
1085 | return sn->pipefs_sb; | |
1086 | mutex_unlock(&sn->pipefs_sb_lock); | |
1087 | return NULL; | |
1088 | } | |
1089 | EXPORT_SYMBOL_GPL(rpc_get_sb_net); | |
1090 | ||
1091 | void rpc_put_sb_net(const struct net *net) | |
1092 | { | |
1093 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
1094 | ||
1095 | BUG_ON(sn->pipefs_sb == NULL); | |
1096 | mutex_unlock(&sn->pipefs_sb_lock); | |
1097 | } | |
1098 | EXPORT_SYMBOL_GPL(rpc_put_sb_net); | |
1099 | ||
1da177e4 LT |
1100 | static int |
1101 | rpc_fill_super(struct super_block *sb, void *data, int silent) | |
1102 | { | |
1103 | struct inode *inode; | |
1104 | struct dentry *root; | |
38b0da75 | 1105 | struct net *net = data; |
90c4e829 | 1106 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
2d00131a | 1107 | int err; |
1da177e4 LT |
1108 | |
1109 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
1110 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
1111 | sb->s_magic = RPCAUTH_GSSMAGIC; | |
1112 | sb->s_op = &s_ops; | |
1113 | sb->s_time_gran = 1; | |
1114 | ||
1115 | inode = rpc_get_inode(sb, S_IFDIR | 0755); | |
1116 | if (!inode) | |
1117 | return -ENOMEM; | |
fc7bed8c | 1118 | sb->s_root = root = d_alloc_root(inode); |
1da177e4 LT |
1119 | if (!root) { |
1120 | iput(inode); | |
1121 | return -ENOMEM; | |
1122 | } | |
ac6fecee | 1123 | if (rpc_populate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF, NULL)) |
fc7bed8c | 1124 | return -ENOMEM; |
efc46bf2 SK |
1125 | dprintk("RPC: sending pipefs MOUNT notification for net %p%s\n", net, |
1126 | NET_NAME(net)); | |
2d00131a SK |
1127 | err = blocking_notifier_call_chain(&rpc_pipefs_notifier_list, |
1128 | RPC_PIPEFS_MOUNT, | |
1129 | sb); | |
1130 | if (err) | |
1131 | goto err_depopulate; | |
021c68de | 1132 | sb->s_fs_info = get_net(net); |
90c4e829 | 1133 | sn->pipefs_sb = sb; |
1da177e4 | 1134 | return 0; |
2d00131a SK |
1135 | |
1136 | err_depopulate: | |
1137 | blocking_notifier_call_chain(&rpc_pipefs_notifier_list, | |
1138 | RPC_PIPEFS_UMOUNT, | |
1139 | sb); | |
1140 | __rpc_depopulate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF); | |
1141 | return err; | |
1da177e4 LT |
1142 | } |
1143 | ||
fc14f2fe AV |
1144 | static struct dentry * |
1145 | rpc_mount(struct file_system_type *fs_type, | |
1146 | int flags, const char *dev_name, void *data) | |
1da177e4 | 1147 | { |
38b0da75 | 1148 | return mount_ns(fs_type, flags, current->nsproxy->net_ns, rpc_fill_super); |
1da177e4 LT |
1149 | } |
1150 | ||
021c68de SK |
1151 | void rpc_kill_sb(struct super_block *sb) |
1152 | { | |
1153 | struct net *net = sb->s_fs_info; | |
90c4e829 | 1154 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
021c68de | 1155 | |
c21a588f | 1156 | mutex_lock(&sn->pipefs_sb_lock); |
90c4e829 | 1157 | sn->pipefs_sb = NULL; |
c21a588f | 1158 | mutex_unlock(&sn->pipefs_sb_lock); |
021c68de | 1159 | put_net(net); |
efc46bf2 SK |
1160 | dprintk("RPC: sending pipefs UMOUNT notification for net %p%s\n", net, |
1161 | NET_NAME(net)); | |
2d00131a SK |
1162 | blocking_notifier_call_chain(&rpc_pipefs_notifier_list, |
1163 | RPC_PIPEFS_UMOUNT, | |
1164 | sb); | |
021c68de SK |
1165 | kill_litter_super(sb); |
1166 | } | |
1167 | ||
1da177e4 LT |
1168 | static struct file_system_type rpc_pipe_fs_type = { |
1169 | .owner = THIS_MODULE, | |
1170 | .name = "rpc_pipefs", | |
fc14f2fe | 1171 | .mount = rpc_mount, |
021c68de | 1172 | .kill_sb = rpc_kill_sb, |
1da177e4 LT |
1173 | }; |
1174 | ||
1175 | static void | |
51cc5068 | 1176 | init_once(void *foo) |
1da177e4 LT |
1177 | { |
1178 | struct rpc_inode *rpci = (struct rpc_inode *) foo; | |
1179 | ||
a35afb83 CL |
1180 | inode_init_once(&rpci->vfs_inode); |
1181 | rpci->private = NULL; | |
ba9e0975 | 1182 | rpci->pipe = NULL; |
591ad7fe | 1183 | init_waitqueue_head(&rpci->waitq); |
1da177e4 LT |
1184 | } |
1185 | ||
1186 | int register_rpc_pipefs(void) | |
1187 | { | |
5bd5f581 AM |
1188 | int err; |
1189 | ||
1da177e4 | 1190 | rpc_inode_cachep = kmem_cache_create("rpc_inode_cache", |
fffb60f9 PJ |
1191 | sizeof(struct rpc_inode), |
1192 | 0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| | |
1193 | SLAB_MEM_SPREAD), | |
20c2df83 | 1194 | init_once); |
1da177e4 LT |
1195 | if (!rpc_inode_cachep) |
1196 | return -ENOMEM; | |
80df9d20 SK |
1197 | err = rpc_clients_notifier_register(); |
1198 | if (err) | |
1199 | goto err_notifier; | |
5bd5f581 | 1200 | err = register_filesystem(&rpc_pipe_fs_type); |
80df9d20 SK |
1201 | if (err) |
1202 | goto err_register; | |
1da177e4 | 1203 | return 0; |
80df9d20 SK |
1204 | |
1205 | err_register: | |
1206 | rpc_clients_notifier_unregister(); | |
1207 | err_notifier: | |
1208 | kmem_cache_destroy(rpc_inode_cachep); | |
1209 | return err; | |
1da177e4 LT |
1210 | } |
1211 | ||
1212 | void unregister_rpc_pipefs(void) | |
1213 | { | |
80df9d20 | 1214 | rpc_clients_notifier_unregister(); |
1a1d92c1 | 1215 | kmem_cache_destroy(rpc_inode_cachep); |
1da177e4 LT |
1216 | unregister_filesystem(&rpc_pipe_fs_type); |
1217 | } | |
dcbf8c30 MS |
1218 | |
1219 | /* Make 'mount -t rpc_pipefs ...' autoload this module. */ | |
1220 | MODULE_ALIAS("rpc_pipefs"); |