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Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * net/sunrpc/rpc_pipe.c | |
3 | * | |
4 | * Userland/kernel interface for rpcauth_gss. | |
5 | * Code shamelessly plagiarized from fs/nfsd/nfsctl.c | |
d51fe1be | 6 | * and fs/sysfs/inode.c |
1da177e4 LT |
7 | * |
8 | * Copyright (c) 2002, Trond Myklebust <trond.myklebust@fys.uio.no> | |
9 | * | |
10 | */ | |
1da177e4 LT |
11 | #include <linux/module.h> |
12 | #include <linux/slab.h> | |
13 | #include <linux/string.h> | |
14 | #include <linux/pagemap.h> | |
15 | #include <linux/mount.h> | |
16 | #include <linux/namei.h> | |
50e437d5 | 17 | #include <linux/fsnotify.h> |
1da177e4 | 18 | #include <linux/kernel.h> |
2446ab60 | 19 | #include <linux/rcupdate.h> |
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(); |
4e0038b6 TM |
407 | seq_printf(m, "RPC server: %s\n", |
408 | rcu_dereference(clnt->cl_xprt)->servername); | |
1da177e4 LT |
409 | seq_printf(m, "service: %s (%d) version %d\n", clnt->cl_protname, |
410 | clnt->cl_prog, clnt->cl_vers); | |
e7f78657 CL |
411 | seq_printf(m, "address: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_ADDR)); |
412 | seq_printf(m, "protocol: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PROTO)); | |
bf19aace | 413 | seq_printf(m, "port: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PORT)); |
2446ab60 | 414 | rcu_read_unlock(); |
1da177e4 LT |
415 | return 0; |
416 | } | |
417 | ||
418 | static int | |
419 | rpc_info_open(struct inode *inode, struct file *file) | |
420 | { | |
006abe88 | 421 | struct rpc_clnt *clnt = NULL; |
1da177e4 LT |
422 | int ret = single_open(file, rpc_show_info, NULL); |
423 | ||
424 | if (!ret) { | |
425 | struct seq_file *m = file->private_data; | |
006abe88 TM |
426 | |
427 | spin_lock(&file->f_path.dentry->d_lock); | |
428 | if (!d_unhashed(file->f_path.dentry)) | |
429 | clnt = RPC_I(inode)->private; | |
430 | if (clnt != NULL && atomic_inc_not_zero(&clnt->cl_count)) { | |
431 | spin_unlock(&file->f_path.dentry->d_lock); | |
1da177e4 LT |
432 | m->private = clnt; |
433 | } else { | |
006abe88 | 434 | spin_unlock(&file->f_path.dentry->d_lock); |
1da177e4 LT |
435 | single_release(inode, file); |
436 | ret = -EINVAL; | |
437 | } | |
1da177e4 LT |
438 | } |
439 | return ret; | |
440 | } | |
441 | ||
442 | static int | |
443 | rpc_info_release(struct inode *inode, struct file *file) | |
444 | { | |
445 | struct seq_file *m = file->private_data; | |
446 | struct rpc_clnt *clnt = (struct rpc_clnt *)m->private; | |
447 | ||
448 | if (clnt) | |
449 | rpc_release_client(clnt); | |
450 | return single_release(inode, file); | |
451 | } | |
452 | ||
da7071d7 | 453 | static const struct file_operations rpc_info_operations = { |
1da177e4 LT |
454 | .owner = THIS_MODULE, |
455 | .open = rpc_info_open, | |
456 | .read = seq_read, | |
457 | .llseek = seq_lseek, | |
458 | .release = rpc_info_release, | |
459 | }; | |
460 | ||
461 | ||
1da177e4 LT |
462 | /* |
463 | * Description of fs contents. | |
464 | */ | |
465 | struct rpc_filelist { | |
ac6fecee | 466 | const char *name; |
99ac48f5 | 467 | const struct file_operations *i_fop; |
7364af6a | 468 | umode_t mode; |
1da177e4 LT |
469 | }; |
470 | ||
fe15ce44 | 471 | static int rpc_delete_dentry(const struct dentry *dentry) |
62e1761c TM |
472 | { |
473 | return 1; | |
474 | } | |
475 | ||
3ba13d17 | 476 | static const struct dentry_operations rpc_dentry_operations = { |
62e1761c TM |
477 | .d_delete = rpc_delete_dentry, |
478 | }; | |
479 | ||
1da177e4 | 480 | static struct inode * |
7364af6a | 481 | rpc_get_inode(struct super_block *sb, umode_t mode) |
1da177e4 LT |
482 | { |
483 | struct inode *inode = new_inode(sb); | |
484 | if (!inode) | |
485 | return NULL; | |
85fe4025 | 486 | inode->i_ino = get_next_ino(); |
1da177e4 | 487 | inode->i_mode = mode; |
1da177e4 | 488 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
89f0e4fe JP |
489 | switch (mode & S_IFMT) { |
490 | case S_IFDIR: | |
491 | inode->i_fop = &simple_dir_operations; | |
492 | inode->i_op = &simple_dir_inode_operations; | |
493 | inc_nlink(inode); | |
494 | default: | |
495 | break; | |
1da177e4 LT |
496 | } |
497 | return inode; | |
498 | } | |
499 | ||
7589806e TM |
500 | static int __rpc_create_common(struct inode *dir, struct dentry *dentry, |
501 | umode_t mode, | |
502 | const struct file_operations *i_fop, | |
503 | void *private) | |
504 | { | |
505 | struct inode *inode; | |
506 | ||
beb0f0a9 | 507 | d_drop(dentry); |
7589806e TM |
508 | inode = rpc_get_inode(dir->i_sb, mode); |
509 | if (!inode) | |
510 | goto out_err; | |
511 | inode->i_ino = iunique(dir->i_sb, 100); | |
512 | if (i_fop) | |
513 | inode->i_fop = i_fop; | |
514 | if (private) | |
515 | rpc_inode_setowner(inode, private); | |
516 | d_add(dentry, inode); | |
517 | return 0; | |
518 | out_err: | |
519 | printk(KERN_WARNING "%s: %s failed to allocate inode for dentry %s\n", | |
520 | __FILE__, __func__, dentry->d_name.name); | |
521 | dput(dentry); | |
522 | return -ENOMEM; | |
523 | } | |
524 | ||
ac6fecee TM |
525 | static int __rpc_create(struct inode *dir, struct dentry *dentry, |
526 | umode_t mode, | |
527 | const struct file_operations *i_fop, | |
528 | void *private) | |
529 | { | |
530 | int err; | |
531 | ||
532 | err = __rpc_create_common(dir, dentry, S_IFREG | mode, i_fop, private); | |
533 | if (err) | |
534 | return err; | |
535 | fsnotify_create(dir, dentry); | |
536 | return 0; | |
537 | } | |
538 | ||
7589806e TM |
539 | static int __rpc_mkdir(struct inode *dir, struct dentry *dentry, |
540 | umode_t mode, | |
541 | const struct file_operations *i_fop, | |
542 | void *private) | |
543 | { | |
544 | int err; | |
545 | ||
546 | err = __rpc_create_common(dir, dentry, S_IFDIR | mode, i_fop, private); | |
547 | if (err) | |
548 | return err; | |
549 | inc_nlink(dir); | |
550 | fsnotify_mkdir(dir, dentry); | |
551 | return 0; | |
552 | } | |
553 | ||
ba9e0975 SK |
554 | static void |
555 | init_pipe(struct rpc_pipe *pipe) | |
556 | { | |
557 | pipe->nreaders = 0; | |
558 | pipe->nwriters = 0; | |
559 | INIT_LIST_HEAD(&pipe->in_upcall); | |
560 | INIT_LIST_HEAD(&pipe->in_downcall); | |
561 | INIT_LIST_HEAD(&pipe->pipe); | |
562 | pipe->pipelen = 0; | |
ba9e0975 SK |
563 | INIT_DELAYED_WORK(&pipe->queue_timeout, |
564 | rpc_timeout_upcall_queue); | |
565 | pipe->ops = NULL; | |
566 | spin_lock_init(&pipe->lock); | |
c239d83b SK |
567 | pipe->dentry = NULL; |
568 | } | |
ba9e0975 | 569 | |
c239d83b SK |
570 | void rpc_destroy_pipe_data(struct rpc_pipe *pipe) |
571 | { | |
572 | kfree(pipe); | |
ba9e0975 | 573 | } |
c239d83b | 574 | EXPORT_SYMBOL_GPL(rpc_destroy_pipe_data); |
ba9e0975 | 575 | |
c239d83b | 576 | struct rpc_pipe *rpc_mkpipe_data(const struct rpc_pipe_ops *ops, int flags) |
7589806e | 577 | { |
ba9e0975 | 578 | struct rpc_pipe *pipe; |
7589806e | 579 | |
ba9e0975 SK |
580 | pipe = kzalloc(sizeof(struct rpc_pipe), GFP_KERNEL); |
581 | if (!pipe) | |
c239d83b | 582 | return ERR_PTR(-ENOMEM); |
ba9e0975 | 583 | init_pipe(pipe); |
c239d83b SK |
584 | pipe->ops = ops; |
585 | pipe->flags = flags; | |
586 | return pipe; | |
587 | } | |
588 | EXPORT_SYMBOL_GPL(rpc_mkpipe_data); | |
589 | ||
590 | static int __rpc_mkpipe_dentry(struct inode *dir, struct dentry *dentry, | |
591 | umode_t mode, | |
592 | const struct file_operations *i_fop, | |
593 | void *private, | |
594 | struct rpc_pipe *pipe) | |
595 | { | |
596 | struct rpc_inode *rpci; | |
597 | int err; | |
598 | ||
7589806e | 599 | err = __rpc_create_common(dir, dentry, S_IFIFO | mode, i_fop, private); |
c239d83b | 600 | if (err) |
7589806e TM |
601 | return err; |
602 | rpci = RPC_I(dentry->d_inode); | |
7589806e | 603 | rpci->private = private; |
ba9e0975 | 604 | rpci->pipe = pipe; |
7589806e TM |
605 | fsnotify_create(dir, dentry); |
606 | return 0; | |
607 | } | |
608 | ||
ac6fecee TM |
609 | static int __rpc_rmdir(struct inode *dir, struct dentry *dentry) |
610 | { | |
611 | int ret; | |
612 | ||
613 | dget(dentry); | |
614 | ret = simple_rmdir(dir, dentry); | |
615 | d_delete(dentry); | |
616 | dput(dentry); | |
617 | return ret; | |
618 | } | |
619 | ||
eee17325 SK |
620 | int rpc_rmdir(struct dentry *dentry) |
621 | { | |
622 | struct dentry *parent; | |
623 | struct inode *dir; | |
624 | int error; | |
625 | ||
626 | parent = dget_parent(dentry); | |
627 | dir = parent->d_inode; | |
628 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); | |
629 | error = __rpc_rmdir(dir, dentry); | |
630 | mutex_unlock(&dir->i_mutex); | |
631 | dput(parent); | |
632 | return error; | |
633 | } | |
634 | EXPORT_SYMBOL_GPL(rpc_rmdir); | |
635 | ||
810d90bc TM |
636 | static int __rpc_unlink(struct inode *dir, struct dentry *dentry) |
637 | { | |
638 | int ret; | |
639 | ||
640 | dget(dentry); | |
641 | ret = simple_unlink(dir, dentry); | |
642 | d_delete(dentry); | |
643 | dput(dentry); | |
644 | return ret; | |
645 | } | |
646 | ||
647 | static int __rpc_rmpipe(struct inode *dir, struct dentry *dentry) | |
648 | { | |
649 | struct inode *inode = dentry->d_inode; | |
810d90bc | 650 | |
810d90bc TM |
651 | rpc_close_pipes(inode); |
652 | return __rpc_unlink(dir, dentry); | |
653 | } | |
654 | ||
5bff0386 | 655 | static struct dentry *__rpc_lookup_create_exclusive(struct dentry *parent, |
cfeaa4a3 TM |
656 | struct qstr *name) |
657 | { | |
658 | struct dentry *dentry; | |
659 | ||
660 | dentry = d_lookup(parent, name); | |
661 | if (!dentry) { | |
662 | dentry = d_alloc(parent, name); | |
5bff0386 SK |
663 | if (!dentry) |
664 | return ERR_PTR(-ENOMEM); | |
cfeaa4a3 | 665 | } |
5bff0386 | 666 | if (dentry->d_inode == NULL) { |
fb045adb | 667 | d_set_d_op(dentry, &rpc_dentry_operations); |
cfeaa4a3 | 668 | return dentry; |
5bff0386 | 669 | } |
cfeaa4a3 TM |
670 | dput(dentry); |
671 | return ERR_PTR(-EEXIST); | |
672 | } | |
673 | ||
1da177e4 LT |
674 | /* |
675 | * FIXME: This probably has races. | |
676 | */ | |
ac6fecee TM |
677 | static void __rpc_depopulate(struct dentry *parent, |
678 | const struct rpc_filelist *files, | |
679 | int start, int eof) | |
1da177e4 LT |
680 | { |
681 | struct inode *dir = parent->d_inode; | |
ac6fecee TM |
682 | struct dentry *dentry; |
683 | struct qstr name; | |
684 | int i; | |
1da177e4 | 685 | |
ac6fecee TM |
686 | for (i = start; i < eof; i++) { |
687 | name.name = files[i].name; | |
688 | name.len = strlen(files[i].name); | |
689 | name.hash = full_name_hash(name.name, name.len); | |
690 | dentry = d_lookup(parent, &name); | |
691 | ||
692 | if (dentry == NULL) | |
62e1761c | 693 | continue; |
ac6fecee TM |
694 | if (dentry->d_inode == NULL) |
695 | goto next; | |
696 | switch (dentry->d_inode->i_mode & S_IFMT) { | |
697 | default: | |
698 | BUG(); | |
699 | case S_IFREG: | |
700 | __rpc_unlink(dir, dentry); | |
1da177e4 | 701 | break; |
ac6fecee TM |
702 | case S_IFDIR: |
703 | __rpc_rmdir(dir, dentry); | |
704 | } | |
705 | next: | |
706 | dput(dentry); | |
1da177e4 | 707 | } |
ac6fecee TM |
708 | } |
709 | ||
710 | static void rpc_depopulate(struct dentry *parent, | |
711 | const struct rpc_filelist *files, | |
712 | int start, int eof) | |
713 | { | |
714 | struct inode *dir = parent->d_inode; | |
715 | ||
716 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_CHILD); | |
717 | __rpc_depopulate(parent, files, start, eof); | |
1b1dcc1b | 718 | mutex_unlock(&dir->i_mutex); |
1da177e4 LT |
719 | } |
720 | ||
ac6fecee TM |
721 | static int rpc_populate(struct dentry *parent, |
722 | const struct rpc_filelist *files, | |
723 | int start, int eof, | |
724 | void *private) | |
1da177e4 | 725 | { |
ac6fecee | 726 | struct inode *dir = parent->d_inode; |
1da177e4 | 727 | struct dentry *dentry; |
ac6fecee | 728 | int i, err; |
1da177e4 | 729 | |
1b1dcc1b | 730 | mutex_lock(&dir->i_mutex); |
1da177e4 | 731 | for (i = start; i < eof; i++) { |
ac6fecee TM |
732 | struct qstr q; |
733 | ||
734 | q.name = files[i].name; | |
735 | q.len = strlen(files[i].name); | |
736 | q.hash = full_name_hash(q.name, q.len); | |
737 | dentry = __rpc_lookup_create_exclusive(parent, &q); | |
738 | err = PTR_ERR(dentry); | |
739 | if (IS_ERR(dentry)) | |
1da177e4 | 740 | goto out_bad; |
ac6fecee TM |
741 | switch (files[i].mode & S_IFMT) { |
742 | default: | |
743 | BUG(); | |
744 | case S_IFREG: | |
745 | err = __rpc_create(dir, dentry, | |
746 | files[i].mode, | |
747 | files[i].i_fop, | |
748 | private); | |
749 | break; | |
750 | case S_IFDIR: | |
751 | err = __rpc_mkdir(dir, dentry, | |
752 | files[i].mode, | |
753 | NULL, | |
754 | private); | |
1da177e4 | 755 | } |
ac6fecee TM |
756 | if (err != 0) |
757 | goto out_bad; | |
1da177e4 | 758 | } |
1b1dcc1b | 759 | mutex_unlock(&dir->i_mutex); |
1da177e4 LT |
760 | return 0; |
761 | out_bad: | |
ac6fecee | 762 | __rpc_depopulate(parent, files, start, eof); |
1b1dcc1b | 763 | mutex_unlock(&dir->i_mutex); |
1da177e4 | 764 | printk(KERN_WARNING "%s: %s failed to populate directory %s\n", |
0dc47877 | 765 | __FILE__, __func__, parent->d_name.name); |
ac6fecee | 766 | return err; |
f134585a | 767 | } |
1da177e4 | 768 | |
e57aed77 TM |
769 | static struct dentry *rpc_mkdir_populate(struct dentry *parent, |
770 | struct qstr *name, umode_t mode, void *private, | |
771 | int (*populate)(struct dentry *, void *), void *args_populate) | |
f134585a | 772 | { |
f134585a | 773 | struct dentry *dentry; |
7d59d1e8 | 774 | struct inode *dir = parent->d_inode; |
f134585a TM |
775 | int error; |
776 | ||
7d59d1e8 TM |
777 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); |
778 | dentry = __rpc_lookup_create_exclusive(parent, name); | |
f134585a | 779 | if (IS_ERR(dentry)) |
7d59d1e8 TM |
780 | goto out; |
781 | error = __rpc_mkdir(dir, dentry, mode, NULL, private); | |
7589806e TM |
782 | if (error != 0) |
783 | goto out_err; | |
e57aed77 TM |
784 | if (populate != NULL) { |
785 | error = populate(dentry, args_populate); | |
786 | if (error) | |
787 | goto err_rmdir; | |
788 | } | |
f134585a | 789 | out: |
1b1dcc1b | 790 | mutex_unlock(&dir->i_mutex); |
5c3e985a | 791 | return dentry; |
ac6fecee | 792 | err_rmdir: |
f134585a | 793 | __rpc_rmdir(dir, dentry); |
7589806e | 794 | out_err: |
f134585a TM |
795 | dentry = ERR_PTR(error); |
796 | goto out; | |
1da177e4 LT |
797 | } |
798 | ||
e57aed77 TM |
799 | static int rpc_rmdir_depopulate(struct dentry *dentry, |
800 | void (*depopulate)(struct dentry *)) | |
1da177e4 | 801 | { |
dff02cc1 | 802 | struct dentry *parent; |
f134585a TM |
803 | struct inode *dir; |
804 | int error; | |
278c995c | 805 | |
dff02cc1 TM |
806 | parent = dget_parent(dentry); |
807 | dir = parent->d_inode; | |
c6573c29 | 808 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); |
e57aed77 TM |
809 | if (depopulate != NULL) |
810 | depopulate(dentry); | |
f134585a | 811 | error = __rpc_rmdir(dir, dentry); |
1b1dcc1b | 812 | mutex_unlock(&dir->i_mutex); |
dff02cc1 | 813 | dput(parent); |
f134585a | 814 | return error; |
1da177e4 LT |
815 | } |
816 | ||
93a44a75 BF |
817 | /** |
818 | * rpc_mkpipe - make an rpc_pipefs file for kernel<->userspace communication | |
819 | * @parent: dentry of directory to create new "pipe" in | |
820 | * @name: name of pipe | |
821 | * @private: private data to associate with the pipe, for the caller's use | |
822 | * @ops: operations defining the behavior of the pipe: upcall, downcall, | |
c3810608 | 823 | * release_pipe, open_pipe, and destroy_msg. |
d0fe13ba | 824 | * @flags: rpc_pipe flags |
93a44a75 BF |
825 | * |
826 | * Data is made available for userspace to read by calls to | |
827 | * rpc_queue_upcall(). The actual reads will result in calls to | |
828 | * @ops->upcall, which will be called with the file pointer, | |
829 | * message, and userspace buffer to copy to. | |
830 | * | |
831 | * Writes can come at any time, and do not necessarily have to be | |
832 | * responses to upcalls. They will result in calls to @msg->downcall. | |
833 | * | |
834 | * The @private argument passed here will be available to all these methods | |
835 | * from the file pointer, via RPC_I(file->f_dentry->d_inode)->private. | |
836 | */ | |
c239d83b SK |
837 | struct dentry *rpc_mkpipe_dentry(struct dentry *parent, const char *name, |
838 | void *private, struct rpc_pipe *pipe) | |
1da177e4 | 839 | { |
1da177e4 | 840 | struct dentry *dentry; |
7589806e | 841 | struct inode *dir = parent->d_inode; |
7364af6a | 842 | umode_t umode = S_IFIFO | S_IRUSR | S_IWUSR; |
cfeaa4a3 | 843 | struct qstr q; |
7589806e | 844 | int err; |
7364af6a | 845 | |
c239d83b | 846 | if (pipe->ops->upcall == NULL) |
7364af6a | 847 | umode &= ~S_IRUGO; |
c239d83b | 848 | if (pipe->ops->downcall == NULL) |
7364af6a | 849 | umode &= ~S_IWUGO; |
1da177e4 | 850 | |
cfeaa4a3 TM |
851 | q.name = name; |
852 | q.len = strlen(name); | |
853 | q.hash = full_name_hash(q.name, q.len), | |
854 | ||
855 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); | |
5bff0386 | 856 | dentry = __rpc_lookup_create_exclusive(parent, &q); |
1da177e4 | 857 | if (IS_ERR(dentry)) |
cfeaa4a3 | 858 | goto out; |
c239d83b SK |
859 | err = __rpc_mkpipe_dentry(dir, dentry, umode, &rpc_pipe_fops, |
860 | private, pipe); | |
7589806e TM |
861 | if (err) |
862 | goto out_err; | |
f134585a | 863 | out: |
1b1dcc1b | 864 | mutex_unlock(&dir->i_mutex); |
5c3e985a | 865 | return dentry; |
7589806e TM |
866 | out_err: |
867 | dentry = ERR_PTR(err); | |
158998b6 | 868 | printk(KERN_WARNING "%s: %s() failed to create pipe %s/%s (errno = %d)\n", |
0dc47877 | 869 | __FILE__, __func__, parent->d_name.name, name, |
7589806e | 870 | err); |
f134585a | 871 | goto out; |
1da177e4 | 872 | } |
c239d83b | 873 | EXPORT_SYMBOL_GPL(rpc_mkpipe_dentry); |
1da177e4 | 874 | |
93a44a75 BF |
875 | /** |
876 | * rpc_unlink - remove a pipe | |
877 | * @dentry: dentry for the pipe, as returned from rpc_mkpipe | |
878 | * | |
879 | * After this call, lookups will no longer find the pipe, and any | |
880 | * attempts to read or write using preexisting opens of the pipe will | |
881 | * return -EPIPE. | |
882 | */ | |
f134585a | 883 | int |
5d67476f | 884 | rpc_unlink(struct dentry *dentry) |
1da177e4 | 885 | { |
5d67476f | 886 | struct dentry *parent; |
f134585a | 887 | struct inode *dir; |
5d67476f | 888 | int error = 0; |
1da177e4 | 889 | |
5d67476f TM |
890 | parent = dget_parent(dentry); |
891 | dir = parent->d_inode; | |
c6573c29 | 892 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); |
810d90bc | 893 | error = __rpc_rmpipe(dir, dentry); |
1b1dcc1b | 894 | mutex_unlock(&dir->i_mutex); |
5d67476f | 895 | dput(parent); |
f134585a | 896 | return error; |
1da177e4 | 897 | } |
468039ee | 898 | EXPORT_SYMBOL_GPL(rpc_unlink); |
1da177e4 | 899 | |
e57aed77 TM |
900 | enum { |
901 | RPCAUTH_info, | |
902 | RPCAUTH_EOF | |
903 | }; | |
904 | ||
905 | static const struct rpc_filelist authfiles[] = { | |
906 | [RPCAUTH_info] = { | |
907 | .name = "info", | |
908 | .i_fop = &rpc_info_operations, | |
909 | .mode = S_IFREG | S_IRUSR, | |
910 | }, | |
911 | }; | |
912 | ||
913 | static int rpc_clntdir_populate(struct dentry *dentry, void *private) | |
914 | { | |
915 | return rpc_populate(dentry, | |
916 | authfiles, RPCAUTH_info, RPCAUTH_EOF, | |
917 | private); | |
918 | } | |
919 | ||
920 | static void rpc_clntdir_depopulate(struct dentry *dentry) | |
921 | { | |
922 | rpc_depopulate(dentry, authfiles, RPCAUTH_info, RPCAUTH_EOF); | |
923 | } | |
924 | ||
7d59d1e8 TM |
925 | /** |
926 | * rpc_create_client_dir - Create a new rpc_client directory in rpc_pipefs | |
4111d4fd RD |
927 | * @dentry: dentry from the rpc_pipefs root to the new directory |
928 | * @name: &struct qstr for the name | |
7d59d1e8 TM |
929 | * @rpc_client: rpc client to associate with this directory |
930 | * | |
931 | * This creates a directory at the given @path associated with | |
932 | * @rpc_clnt, which will contain a file named "info" with some basic | |
933 | * information about the client, together with any "pipes" that may | |
934 | * later be created using rpc_mkpipe(). | |
935 | */ | |
23ac6581 | 936 | struct dentry *rpc_create_client_dir(struct dentry *dentry, |
e57aed77 TM |
937 | struct qstr *name, |
938 | struct rpc_clnt *rpc_client) | |
939 | { | |
940 | return rpc_mkdir_populate(dentry, name, S_IRUGO | S_IXUGO, NULL, | |
941 | rpc_clntdir_populate, rpc_client); | |
942 | } | |
943 | ||
944 | /** | |
945 | * rpc_remove_client_dir - Remove a directory created with rpc_create_client_dir() | |
80df9d20 | 946 | * @clnt: rpc client |
e57aed77 TM |
947 | */ |
948 | int rpc_remove_client_dir(struct dentry *dentry) | |
7d59d1e8 | 949 | { |
e57aed77 | 950 | return rpc_rmdir_depopulate(dentry, rpc_clntdir_depopulate); |
7d59d1e8 TM |
951 | } |
952 | ||
8854e82d TM |
953 | static const struct rpc_filelist cache_pipefs_files[3] = { |
954 | [0] = { | |
955 | .name = "channel", | |
956 | .i_fop = &cache_file_operations_pipefs, | |
96c61cbd | 957 | .mode = S_IFREG|S_IRUSR|S_IWUSR, |
8854e82d TM |
958 | }, |
959 | [1] = { | |
960 | .name = "content", | |
961 | .i_fop = &content_file_operations_pipefs, | |
962 | .mode = S_IFREG|S_IRUSR, | |
963 | }, | |
964 | [2] = { | |
965 | .name = "flush", | |
966 | .i_fop = &cache_flush_operations_pipefs, | |
967 | .mode = S_IFREG|S_IRUSR|S_IWUSR, | |
968 | }, | |
969 | }; | |
970 | ||
971 | static int rpc_cachedir_populate(struct dentry *dentry, void *private) | |
972 | { | |
973 | return rpc_populate(dentry, | |
974 | cache_pipefs_files, 0, 3, | |
975 | private); | |
976 | } | |
977 | ||
978 | static void rpc_cachedir_depopulate(struct dentry *dentry) | |
979 | { | |
980 | rpc_depopulate(dentry, cache_pipefs_files, 0, 3); | |
981 | } | |
982 | ||
983 | struct dentry *rpc_create_cache_dir(struct dentry *parent, struct qstr *name, | |
64f1426f | 984 | umode_t umode, struct cache_detail *cd) |
8854e82d TM |
985 | { |
986 | return rpc_mkdir_populate(parent, name, umode, NULL, | |
987 | rpc_cachedir_populate, cd); | |
988 | } | |
989 | ||
990 | void rpc_remove_cache_dir(struct dentry *dentry) | |
991 | { | |
992 | rpc_rmdir_depopulate(dentry, rpc_cachedir_depopulate); | |
993 | } | |
994 | ||
1da177e4 LT |
995 | /* |
996 | * populate the filesystem | |
997 | */ | |
b87221de | 998 | static const struct super_operations s_ops = { |
1da177e4 LT |
999 | .alloc_inode = rpc_alloc_inode, |
1000 | .destroy_inode = rpc_destroy_inode, | |
1001 | .statfs = simple_statfs, | |
1002 | }; | |
1003 | ||
1004 | #define RPCAUTH_GSSMAGIC 0x67596969 | |
1005 | ||
bb156749 TM |
1006 | /* |
1007 | * We have a single directory with 1 node in it. | |
1008 | */ | |
1009 | enum { | |
1010 | RPCAUTH_lockd, | |
1011 | RPCAUTH_mount, | |
1012 | RPCAUTH_nfs, | |
1013 | RPCAUTH_portmap, | |
1014 | RPCAUTH_statd, | |
1015 | RPCAUTH_nfsd4_cb, | |
e571cbf1 | 1016 | RPCAUTH_cache, |
bb156749 TM |
1017 | RPCAUTH_RootEOF |
1018 | }; | |
1019 | ||
1020 | static const struct rpc_filelist files[] = { | |
1021 | [RPCAUTH_lockd] = { | |
1022 | .name = "lockd", | |
1023 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
1024 | }, | |
1025 | [RPCAUTH_mount] = { | |
1026 | .name = "mount", | |
1027 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
1028 | }, | |
1029 | [RPCAUTH_nfs] = { | |
1030 | .name = "nfs", | |
1031 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
1032 | }, | |
1033 | [RPCAUTH_portmap] = { | |
1034 | .name = "portmap", | |
1035 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
1036 | }, | |
1037 | [RPCAUTH_statd] = { | |
1038 | .name = "statd", | |
1039 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
1040 | }, | |
1041 | [RPCAUTH_nfsd4_cb] = { | |
1042 | .name = "nfsd4_cb", | |
1043 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
1044 | }, | |
e571cbf1 TM |
1045 | [RPCAUTH_cache] = { |
1046 | .name = "cache", | |
1047 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
1048 | }, | |
bb156749 TM |
1049 | }; |
1050 | ||
432eb1a5 SK |
1051 | /* |
1052 | * This call can be used only in RPC pipefs mount notification hooks. | |
1053 | */ | |
1054 | struct dentry *rpc_d_lookup_sb(const struct super_block *sb, | |
1055 | const unsigned char *dir_name) | |
1056 | { | |
1057 | struct qstr dir = { | |
1058 | .name = dir_name, | |
1059 | .len = strlen(dir_name), | |
1060 | .hash = full_name_hash(dir_name, strlen(dir_name)), | |
1061 | }; | |
1062 | ||
1063 | return d_lookup(sb->s_root, &dir); | |
1064 | } | |
1065 | EXPORT_SYMBOL_GPL(rpc_d_lookup_sb); | |
1066 | ||
c21a588f SK |
1067 | void rpc_pipefs_init_net(struct net *net) |
1068 | { | |
1069 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
1070 | ||
1071 | mutex_init(&sn->pipefs_sb_lock); | |
1072 | } | |
1073 | ||
1074 | /* | |
1075 | * This call will be used for per network namespace operations calls. | |
1076 | * Note: Function will be returned with pipefs_sb_lock taken if superblock was | |
1077 | * found. This lock have to be released by rpc_put_sb_net() when all operations | |
1078 | * will be completed. | |
1079 | */ | |
1080 | struct super_block *rpc_get_sb_net(const struct net *net) | |
1081 | { | |
1082 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
1083 | ||
1084 | mutex_lock(&sn->pipefs_sb_lock); | |
1085 | if (sn->pipefs_sb) | |
1086 | return sn->pipefs_sb; | |
1087 | mutex_unlock(&sn->pipefs_sb_lock); | |
1088 | return NULL; | |
1089 | } | |
1090 | EXPORT_SYMBOL_GPL(rpc_get_sb_net); | |
1091 | ||
1092 | void rpc_put_sb_net(const struct net *net) | |
1093 | { | |
1094 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
1095 | ||
1096 | BUG_ON(sn->pipefs_sb == NULL); | |
1097 | mutex_unlock(&sn->pipefs_sb_lock); | |
1098 | } | |
1099 | EXPORT_SYMBOL_GPL(rpc_put_sb_net); | |
1100 | ||
1da177e4 LT |
1101 | static int |
1102 | rpc_fill_super(struct super_block *sb, void *data, int silent) | |
1103 | { | |
1104 | struct inode *inode; | |
1105 | struct dentry *root; | |
38b0da75 | 1106 | struct net *net = data; |
90c4e829 | 1107 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
2d00131a | 1108 | int err; |
1da177e4 LT |
1109 | |
1110 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
1111 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
1112 | sb->s_magic = RPCAUTH_GSSMAGIC; | |
1113 | sb->s_op = &s_ops; | |
1114 | sb->s_time_gran = 1; | |
1115 | ||
1116 | inode = rpc_get_inode(sb, S_IFDIR | 0755); | |
1117 | if (!inode) | |
1118 | return -ENOMEM; | |
fc7bed8c | 1119 | sb->s_root = root = d_alloc_root(inode); |
1da177e4 LT |
1120 | if (!root) { |
1121 | iput(inode); | |
1122 | return -ENOMEM; | |
1123 | } | |
ac6fecee | 1124 | if (rpc_populate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF, NULL)) |
fc7bed8c | 1125 | return -ENOMEM; |
efc46bf2 SK |
1126 | dprintk("RPC: sending pipefs MOUNT notification for net %p%s\n", net, |
1127 | NET_NAME(net)); | |
2d00131a SK |
1128 | err = blocking_notifier_call_chain(&rpc_pipefs_notifier_list, |
1129 | RPC_PIPEFS_MOUNT, | |
1130 | sb); | |
1131 | if (err) | |
1132 | goto err_depopulate; | |
021c68de | 1133 | sb->s_fs_info = get_net(net); |
90c4e829 | 1134 | sn->pipefs_sb = sb; |
1da177e4 | 1135 | return 0; |
2d00131a SK |
1136 | |
1137 | err_depopulate: | |
1138 | blocking_notifier_call_chain(&rpc_pipefs_notifier_list, | |
1139 | RPC_PIPEFS_UMOUNT, | |
1140 | sb); | |
1141 | __rpc_depopulate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF); | |
1142 | return err; | |
1da177e4 LT |
1143 | } |
1144 | ||
fc14f2fe AV |
1145 | static struct dentry * |
1146 | rpc_mount(struct file_system_type *fs_type, | |
1147 | int flags, const char *dev_name, void *data) | |
1da177e4 | 1148 | { |
38b0da75 | 1149 | return mount_ns(fs_type, flags, current->nsproxy->net_ns, rpc_fill_super); |
1da177e4 LT |
1150 | } |
1151 | ||
09acfea5 | 1152 | static void rpc_kill_sb(struct super_block *sb) |
021c68de SK |
1153 | { |
1154 | struct net *net = sb->s_fs_info; | |
90c4e829 | 1155 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
021c68de | 1156 | |
c21a588f | 1157 | mutex_lock(&sn->pipefs_sb_lock); |
90c4e829 | 1158 | sn->pipefs_sb = NULL; |
c21a588f | 1159 | mutex_unlock(&sn->pipefs_sb_lock); |
021c68de | 1160 | put_net(net); |
efc46bf2 SK |
1161 | dprintk("RPC: sending pipefs UMOUNT notification for net %p%s\n", net, |
1162 | NET_NAME(net)); | |
2d00131a SK |
1163 | blocking_notifier_call_chain(&rpc_pipefs_notifier_list, |
1164 | RPC_PIPEFS_UMOUNT, | |
1165 | sb); | |
021c68de SK |
1166 | kill_litter_super(sb); |
1167 | } | |
1168 | ||
1da177e4 LT |
1169 | static struct file_system_type rpc_pipe_fs_type = { |
1170 | .owner = THIS_MODULE, | |
1171 | .name = "rpc_pipefs", | |
fc14f2fe | 1172 | .mount = rpc_mount, |
021c68de | 1173 | .kill_sb = rpc_kill_sb, |
1da177e4 LT |
1174 | }; |
1175 | ||
1176 | static void | |
51cc5068 | 1177 | init_once(void *foo) |
1da177e4 LT |
1178 | { |
1179 | struct rpc_inode *rpci = (struct rpc_inode *) foo; | |
1180 | ||
a35afb83 CL |
1181 | inode_init_once(&rpci->vfs_inode); |
1182 | rpci->private = NULL; | |
ba9e0975 | 1183 | rpci->pipe = NULL; |
591ad7fe | 1184 | init_waitqueue_head(&rpci->waitq); |
1da177e4 LT |
1185 | } |
1186 | ||
1187 | int register_rpc_pipefs(void) | |
1188 | { | |
5bd5f581 AM |
1189 | int err; |
1190 | ||
1da177e4 | 1191 | rpc_inode_cachep = kmem_cache_create("rpc_inode_cache", |
fffb60f9 PJ |
1192 | sizeof(struct rpc_inode), |
1193 | 0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| | |
1194 | SLAB_MEM_SPREAD), | |
20c2df83 | 1195 | init_once); |
1da177e4 LT |
1196 | if (!rpc_inode_cachep) |
1197 | return -ENOMEM; | |
80df9d20 SK |
1198 | err = rpc_clients_notifier_register(); |
1199 | if (err) | |
1200 | goto err_notifier; | |
5bd5f581 | 1201 | err = register_filesystem(&rpc_pipe_fs_type); |
80df9d20 SK |
1202 | if (err) |
1203 | goto err_register; | |
1da177e4 | 1204 | return 0; |
80df9d20 SK |
1205 | |
1206 | err_register: | |
1207 | rpc_clients_notifier_unregister(); | |
1208 | err_notifier: | |
1209 | kmem_cache_destroy(rpc_inode_cachep); | |
1210 | return err; | |
1da177e4 LT |
1211 | } |
1212 | ||
1213 | void unregister_rpc_pipefs(void) | |
1214 | { | |
80df9d20 | 1215 | rpc_clients_notifier_unregister(); |
1a1d92c1 | 1216 | kmem_cache_destroy(rpc_inode_cachep); |
1da177e4 LT |
1217 | unregister_filesystem(&rpc_pipe_fs_type); |
1218 | } | |
dcbf8c30 MS |
1219 | |
1220 | /* Make 'mount -t rpc_pipefs ...' autoload this module. */ | |
1221 | MODULE_ALIAS("rpc_pipefs"); |