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 | 88 | spin_lock(&pipe->lock); |
ba9e0975 SK |
89 | destroy_msg = pipe->ops->destroy_msg; |
90 | if (pipe->nreaders == 0) { | |
91 | list_splice_init(&pipe->pipe, &free_list); | |
92 | pipe->pipelen = 0; | |
9842ef35 | 93 | } |
ba9e0975 SK |
94 | spin_unlock(&pipe->lock); |
95 | rpc_purge_list(pipe, &free_list, destroy_msg, -ETIMEDOUT); | |
1da177e4 LT |
96 | } |
97 | ||
c1225158 PT |
98 | ssize_t rpc_pipe_generic_upcall(struct file *filp, struct rpc_pipe_msg *msg, |
99 | char __user *dst, size_t buflen) | |
100 | { | |
101 | char *data = (char *)msg->data + msg->copied; | |
102 | size_t mlen = min(msg->len - msg->copied, buflen); | |
103 | unsigned long left; | |
104 | ||
105 | left = copy_to_user(dst, data, mlen); | |
106 | if (left == mlen) { | |
107 | msg->errno = -EFAULT; | |
108 | return -EFAULT; | |
109 | } | |
110 | ||
111 | mlen -= left; | |
112 | msg->copied += mlen; | |
113 | msg->errno = 0; | |
114 | return mlen; | |
115 | } | |
116 | EXPORT_SYMBOL_GPL(rpc_pipe_generic_upcall); | |
117 | ||
93a44a75 | 118 | /** |
1a5778aa | 119 | * rpc_queue_upcall - queue an upcall message to userspace |
93a44a75 BF |
120 | * @inode: inode of upcall pipe on which to queue given message |
121 | * @msg: message to queue | |
122 | * | |
123 | * Call with an @inode created by rpc_mkpipe() to queue an upcall. | |
124 | * A userspace process may then later read the upcall by performing a | |
125 | * read on an open file for this inode. It is up to the caller to | |
126 | * initialize the fields of @msg (other than @msg->list) appropriately. | |
127 | */ | |
1da177e4 | 128 | int |
d706ed1f | 129 | rpc_queue_upcall(struct rpc_pipe *pipe, struct rpc_pipe_msg *msg) |
1da177e4 | 130 | { |
6070fe6f | 131 | int res = -EPIPE; |
1da177e4 | 132 | |
d0fe13ba | 133 | spin_lock(&pipe->lock); |
d0fe13ba SK |
134 | if (pipe->nreaders) { |
135 | list_add_tail(&msg->list, &pipe->pipe); | |
136 | pipe->pipelen += msg->len; | |
6070fe6f | 137 | res = 0; |
d0fe13ba SK |
138 | } else if (pipe->flags & RPC_PIPE_WAIT_FOR_OPEN) { |
139 | if (list_empty(&pipe->pipe)) | |
24c5d9d7 | 140 | queue_delayed_work(rpciod_workqueue, |
d0fe13ba | 141 | &pipe->queue_timeout, |
1da177e4 | 142 | RPC_UPCALL_TIMEOUT); |
d0fe13ba SK |
143 | list_add_tail(&msg->list, &pipe->pipe); |
144 | pipe->pipelen += msg->len; | |
6070fe6f TM |
145 | res = 0; |
146 | } | |
d0fe13ba SK |
147 | spin_unlock(&pipe->lock); |
148 | wake_up(&pipe->waitq); | |
1da177e4 LT |
149 | return res; |
150 | } | |
468039ee | 151 | EXPORT_SYMBOL_GPL(rpc_queue_upcall); |
1da177e4 | 152 | |
6070fe6f TM |
153 | static inline void |
154 | rpc_inode_setowner(struct inode *inode, void *private) | |
155 | { | |
156 | RPC_I(inode)->private = private; | |
157 | } | |
158 | ||
1da177e4 LT |
159 | static void |
160 | rpc_close_pipes(struct inode *inode) | |
161 | { | |
ba9e0975 | 162 | struct rpc_pipe *pipe = RPC_I(inode)->pipe; |
e712804a | 163 | int need_release; |
ad6b1340 | 164 | LIST_HEAD(free_list); |
1da177e4 | 165 | |
1b1dcc1b | 166 | mutex_lock(&inode->i_mutex); |
ad6b1340 SK |
167 | spin_lock(&pipe->lock); |
168 | need_release = pipe->nreaders != 0 || pipe->nwriters != 0; | |
169 | pipe->nreaders = 0; | |
170 | list_splice_init(&pipe->in_upcall, &free_list); | |
171 | list_splice_init(&pipe->pipe, &free_list); | |
172 | pipe->pipelen = 0; | |
173 | pipe->dentry = NULL; | |
174 | spin_unlock(&pipe->lock); | |
175 | rpc_purge_list(pipe, &free_list, pipe->ops->destroy_msg, -EPIPE); | |
176 | pipe->nwriters = 0; | |
177 | if (need_release && pipe->ops->release_pipe) | |
178 | pipe->ops->release_pipe(inode); | |
179 | cancel_delayed_work_sync(&pipe->queue_timeout); | |
6070fe6f | 180 | rpc_inode_setowner(inode, NULL); |
1b1dcc1b | 181 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
182 | } |
183 | ||
1da177e4 LT |
184 | static struct inode * |
185 | rpc_alloc_inode(struct super_block *sb) | |
186 | { | |
187 | struct rpc_inode *rpci; | |
e94b1766 | 188 | rpci = (struct rpc_inode *)kmem_cache_alloc(rpc_inode_cachep, GFP_KERNEL); |
1da177e4 LT |
189 | if (!rpci) |
190 | return NULL; | |
191 | return &rpci->vfs_inode; | |
192 | } | |
193 | ||
194 | static void | |
fa0d7e3d | 195 | rpc_i_callback(struct rcu_head *head) |
1da177e4 | 196 | { |
fa0d7e3d | 197 | struct inode *inode = container_of(head, struct inode, i_rcu); |
1da177e4 LT |
198 | kmem_cache_free(rpc_inode_cachep, RPC_I(inode)); |
199 | } | |
200 | ||
fa0d7e3d NP |
201 | static void |
202 | rpc_destroy_inode(struct inode *inode) | |
203 | { | |
204 | call_rcu(&inode->i_rcu, rpc_i_callback); | |
205 | } | |
206 | ||
1da177e4 LT |
207 | static int |
208 | rpc_pipe_open(struct inode *inode, struct file *filp) | |
209 | { | |
d0fe13ba | 210 | struct rpc_pipe *pipe = RPC_I(inode)->pipe; |
c3810608 | 211 | int first_open; |
1da177e4 LT |
212 | int res = -ENXIO; |
213 | ||
1b1dcc1b | 214 | mutex_lock(&inode->i_mutex); |
ad6b1340 | 215 | if (pipe->dentry == NULL) |
c3810608 | 216 | goto out; |
d0fe13ba SK |
217 | first_open = pipe->nreaders == 0 && pipe->nwriters == 0; |
218 | if (first_open && pipe->ops->open_pipe) { | |
219 | res = pipe->ops->open_pipe(inode); | |
c3810608 BF |
220 | if (res) |
221 | goto out; | |
1da177e4 | 222 | } |
c3810608 | 223 | if (filp->f_mode & FMODE_READ) |
d0fe13ba | 224 | pipe->nreaders++; |
c3810608 | 225 | if (filp->f_mode & FMODE_WRITE) |
d0fe13ba | 226 | pipe->nwriters++; |
c3810608 BF |
227 | res = 0; |
228 | out: | |
1b1dcc1b | 229 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
230 | return res; |
231 | } | |
232 | ||
233 | static int | |
234 | rpc_pipe_release(struct inode *inode, struct file *filp) | |
235 | { | |
ba9e0975 | 236 | struct rpc_pipe *pipe = RPC_I(inode)->pipe; |
1da177e4 | 237 | struct rpc_pipe_msg *msg; |
e712804a | 238 | int last_close; |
1da177e4 | 239 | |
1b1dcc1b | 240 | mutex_lock(&inode->i_mutex); |
ad6b1340 | 241 | if (pipe->dentry == NULL) |
1da177e4 | 242 | goto out; |
655b5bb4 | 243 | msg = filp->private_data; |
1da177e4 | 244 | if (msg != NULL) { |
ba9e0975 | 245 | spin_lock(&pipe->lock); |
48e49187 | 246 | msg->errno = -EAGAIN; |
5a67657a | 247 | list_del_init(&msg->list); |
ba9e0975 SK |
248 | spin_unlock(&pipe->lock); |
249 | pipe->ops->destroy_msg(msg); | |
1da177e4 LT |
250 | } |
251 | if (filp->f_mode & FMODE_WRITE) | |
ba9e0975 | 252 | pipe->nwriters --; |
9842ef35 | 253 | if (filp->f_mode & FMODE_READ) { |
ba9e0975 SK |
254 | pipe->nreaders --; |
255 | if (pipe->nreaders == 0) { | |
9842ef35 | 256 | LIST_HEAD(free_list); |
ba9e0975 SK |
257 | spin_lock(&pipe->lock); |
258 | list_splice_init(&pipe->pipe, &free_list); | |
259 | pipe->pipelen = 0; | |
260 | spin_unlock(&pipe->lock); | |
261 | rpc_purge_list(pipe, &free_list, | |
262 | pipe->ops->destroy_msg, -EAGAIN); | |
9842ef35 TM |
263 | } |
264 | } | |
ba9e0975 SK |
265 | last_close = pipe->nwriters == 0 && pipe->nreaders == 0; |
266 | if (last_close && pipe->ops->release_pipe) | |
267 | pipe->ops->release_pipe(inode); | |
1da177e4 | 268 | out: |
1b1dcc1b | 269 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
270 | return 0; |
271 | } | |
272 | ||
273 | static ssize_t | |
274 | rpc_pipe_read(struct file *filp, char __user *buf, size_t len, loff_t *offset) | |
275 | { | |
303b46bb | 276 | struct inode *inode = filp->f_path.dentry->d_inode; |
d0fe13ba | 277 | struct rpc_pipe *pipe = RPC_I(inode)->pipe; |
1da177e4 LT |
278 | struct rpc_pipe_msg *msg; |
279 | int res = 0; | |
280 | ||
1b1dcc1b | 281 | mutex_lock(&inode->i_mutex); |
ad6b1340 | 282 | if (pipe->dentry == NULL) { |
1da177e4 LT |
283 | res = -EPIPE; |
284 | goto out_unlock; | |
285 | } | |
286 | msg = filp->private_data; | |
287 | if (msg == NULL) { | |
d0fe13ba SK |
288 | spin_lock(&pipe->lock); |
289 | if (!list_empty(&pipe->pipe)) { | |
290 | msg = list_entry(pipe->pipe.next, | |
1da177e4 LT |
291 | struct rpc_pipe_msg, |
292 | list); | |
d0fe13ba SK |
293 | list_move(&msg->list, &pipe->in_upcall); |
294 | pipe->pipelen -= msg->len; | |
1da177e4 LT |
295 | filp->private_data = msg; |
296 | msg->copied = 0; | |
297 | } | |
d0fe13ba | 298 | spin_unlock(&pipe->lock); |
1da177e4 LT |
299 | if (msg == NULL) |
300 | goto out_unlock; | |
301 | } | |
302 | /* NOTE: it is up to the callback to update msg->copied */ | |
d0fe13ba | 303 | res = pipe->ops->upcall(filp, msg, buf, len); |
1da177e4 LT |
304 | if (res < 0 || msg->len == msg->copied) { |
305 | filp->private_data = NULL; | |
d0fe13ba | 306 | spin_lock(&pipe->lock); |
5a67657a | 307 | list_del_init(&msg->list); |
d0fe13ba SK |
308 | spin_unlock(&pipe->lock); |
309 | pipe->ops->destroy_msg(msg); | |
1da177e4 LT |
310 | } |
311 | out_unlock: | |
1b1dcc1b | 312 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
313 | return res; |
314 | } | |
315 | ||
316 | static ssize_t | |
317 | rpc_pipe_write(struct file *filp, const char __user *buf, size_t len, loff_t *offset) | |
318 | { | |
303b46bb | 319 | struct inode *inode = filp->f_path.dentry->d_inode; |
d0fe13ba | 320 | struct rpc_pipe *pipe = RPC_I(inode)->pipe; |
1da177e4 LT |
321 | int res; |
322 | ||
1b1dcc1b | 323 | mutex_lock(&inode->i_mutex); |
1da177e4 | 324 | res = -EPIPE; |
ad6b1340 | 325 | if (pipe->dentry != NULL) |
d0fe13ba | 326 | res = pipe->ops->downcall(filp, buf, len); |
1b1dcc1b | 327 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
328 | return res; |
329 | } | |
330 | ||
331 | static unsigned int | |
332 | rpc_pipe_poll(struct file *filp, struct poll_table_struct *wait) | |
333 | { | |
d0fe13ba | 334 | struct rpc_pipe *pipe = RPC_I(filp->f_path.dentry->d_inode)->pipe; |
1da177e4 LT |
335 | unsigned int mask = 0; |
336 | ||
d0fe13ba | 337 | poll_wait(filp, &pipe->waitq, wait); |
1da177e4 LT |
338 | |
339 | mask = POLLOUT | POLLWRNORM; | |
ad6b1340 | 340 | if (pipe->dentry == NULL) |
1da177e4 | 341 | mask |= POLLERR | POLLHUP; |
d0fe13ba | 342 | if (filp->private_data || !list_empty(&pipe->pipe)) |
1da177e4 LT |
343 | mask |= POLLIN | POLLRDNORM; |
344 | return mask; | |
345 | } | |
346 | ||
a6f8dbc6 AB |
347 | static long |
348 | rpc_pipe_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) | |
1da177e4 | 349 | { |
a6f8dbc6 | 350 | struct inode *inode = filp->f_path.dentry->d_inode; |
d0fe13ba | 351 | struct rpc_pipe *pipe = RPC_I(inode)->pipe; |
1da177e4 LT |
352 | int len; |
353 | ||
354 | switch (cmd) { | |
355 | case FIONREAD: | |
d0fe13ba | 356 | spin_lock(&pipe->lock); |
ad6b1340 | 357 | if (pipe->dentry == NULL) { |
d0fe13ba | 358 | spin_unlock(&pipe->lock); |
1da177e4 | 359 | return -EPIPE; |
a6f8dbc6 | 360 | } |
d0fe13ba | 361 | len = pipe->pipelen; |
1da177e4 LT |
362 | if (filp->private_data) { |
363 | struct rpc_pipe_msg *msg; | |
655b5bb4 | 364 | msg = filp->private_data; |
1da177e4 LT |
365 | len += msg->len - msg->copied; |
366 | } | |
d0fe13ba | 367 | spin_unlock(&pipe->lock); |
1da177e4 LT |
368 | return put_user(len, (int __user *)arg); |
369 | default: | |
370 | return -EINVAL; | |
371 | } | |
372 | } | |
373 | ||
da7071d7 | 374 | static const struct file_operations rpc_pipe_fops = { |
1da177e4 LT |
375 | .owner = THIS_MODULE, |
376 | .llseek = no_llseek, | |
377 | .read = rpc_pipe_read, | |
378 | .write = rpc_pipe_write, | |
379 | .poll = rpc_pipe_poll, | |
674b604c | 380 | .unlocked_ioctl = rpc_pipe_ioctl, |
1da177e4 LT |
381 | .open = rpc_pipe_open, |
382 | .release = rpc_pipe_release, | |
383 | }; | |
384 | ||
385 | static int | |
386 | rpc_show_info(struct seq_file *m, void *v) | |
387 | { | |
388 | struct rpc_clnt *clnt = m->private; | |
389 | ||
390 | seq_printf(m, "RPC server: %s\n", clnt->cl_server); | |
391 | seq_printf(m, "service: %s (%d) version %d\n", clnt->cl_protname, | |
392 | clnt->cl_prog, clnt->cl_vers); | |
e7f78657 CL |
393 | seq_printf(m, "address: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_ADDR)); |
394 | seq_printf(m, "protocol: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PROTO)); | |
bf19aace | 395 | seq_printf(m, "port: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PORT)); |
1da177e4 LT |
396 | return 0; |
397 | } | |
398 | ||
399 | static int | |
400 | rpc_info_open(struct inode *inode, struct file *file) | |
401 | { | |
006abe88 | 402 | struct rpc_clnt *clnt = NULL; |
1da177e4 LT |
403 | int ret = single_open(file, rpc_show_info, NULL); |
404 | ||
405 | if (!ret) { | |
406 | struct seq_file *m = file->private_data; | |
006abe88 TM |
407 | |
408 | spin_lock(&file->f_path.dentry->d_lock); | |
409 | if (!d_unhashed(file->f_path.dentry)) | |
410 | clnt = RPC_I(inode)->private; | |
411 | if (clnt != NULL && atomic_inc_not_zero(&clnt->cl_count)) { | |
412 | spin_unlock(&file->f_path.dentry->d_lock); | |
1da177e4 LT |
413 | m->private = clnt; |
414 | } else { | |
006abe88 | 415 | spin_unlock(&file->f_path.dentry->d_lock); |
1da177e4 LT |
416 | single_release(inode, file); |
417 | ret = -EINVAL; | |
418 | } | |
1da177e4 LT |
419 | } |
420 | return ret; | |
421 | } | |
422 | ||
423 | static int | |
424 | rpc_info_release(struct inode *inode, struct file *file) | |
425 | { | |
426 | struct seq_file *m = file->private_data; | |
427 | struct rpc_clnt *clnt = (struct rpc_clnt *)m->private; | |
428 | ||
429 | if (clnt) | |
430 | rpc_release_client(clnt); | |
431 | return single_release(inode, file); | |
432 | } | |
433 | ||
da7071d7 | 434 | static const struct file_operations rpc_info_operations = { |
1da177e4 LT |
435 | .owner = THIS_MODULE, |
436 | .open = rpc_info_open, | |
437 | .read = seq_read, | |
438 | .llseek = seq_lseek, | |
439 | .release = rpc_info_release, | |
440 | }; | |
441 | ||
442 | ||
1da177e4 LT |
443 | /* |
444 | * Description of fs contents. | |
445 | */ | |
446 | struct rpc_filelist { | |
ac6fecee | 447 | const char *name; |
99ac48f5 | 448 | const struct file_operations *i_fop; |
7364af6a | 449 | umode_t mode; |
1da177e4 LT |
450 | }; |
451 | ||
54281548 | 452 | struct vfsmount *rpc_get_mount(void) |
1da177e4 | 453 | { |
54281548 TM |
454 | int err; |
455 | ||
fc14f2fe | 456 | err = simple_pin_fs(&rpc_pipe_fs_type, &rpc_mnt, &rpc_mount_count); |
54281548 TM |
457 | if (err != 0) |
458 | return ERR_PTR(err); | |
fc14f2fe | 459 | return rpc_mnt; |
1da177e4 | 460 | } |
e571cbf1 | 461 | EXPORT_SYMBOL_GPL(rpc_get_mount); |
1da177e4 | 462 | |
54281548 | 463 | void rpc_put_mount(void) |
1da177e4 | 464 | { |
fc14f2fe | 465 | simple_release_fs(&rpc_mnt, &rpc_mount_count); |
1da177e4 | 466 | } |
e571cbf1 | 467 | EXPORT_SYMBOL_GPL(rpc_put_mount); |
1da177e4 | 468 | |
fe15ce44 | 469 | static int rpc_delete_dentry(const struct dentry *dentry) |
62e1761c TM |
470 | { |
471 | return 1; | |
472 | } | |
473 | ||
3ba13d17 | 474 | static const struct dentry_operations rpc_dentry_operations = { |
62e1761c TM |
475 | .d_delete = rpc_delete_dentry, |
476 | }; | |
477 | ||
1da177e4 | 478 | static struct inode * |
7364af6a | 479 | rpc_get_inode(struct super_block *sb, umode_t mode) |
1da177e4 LT |
480 | { |
481 | struct inode *inode = new_inode(sb); | |
482 | if (!inode) | |
483 | return NULL; | |
85fe4025 | 484 | inode->i_ino = get_next_ino(); |
1da177e4 | 485 | inode->i_mode = mode; |
1da177e4 | 486 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
89f0e4fe JP |
487 | switch (mode & S_IFMT) { |
488 | case S_IFDIR: | |
489 | inode->i_fop = &simple_dir_operations; | |
490 | inode->i_op = &simple_dir_inode_operations; | |
491 | inc_nlink(inode); | |
492 | default: | |
493 | break; | |
1da177e4 LT |
494 | } |
495 | return inode; | |
496 | } | |
497 | ||
7589806e TM |
498 | static int __rpc_create_common(struct inode *dir, struct dentry *dentry, |
499 | umode_t mode, | |
500 | const struct file_operations *i_fop, | |
501 | void *private) | |
502 | { | |
503 | struct inode *inode; | |
504 | ||
beb0f0a9 | 505 | d_drop(dentry); |
7589806e TM |
506 | inode = rpc_get_inode(dir->i_sb, mode); |
507 | if (!inode) | |
508 | goto out_err; | |
509 | inode->i_ino = iunique(dir->i_sb, 100); | |
510 | if (i_fop) | |
511 | inode->i_fop = i_fop; | |
512 | if (private) | |
513 | rpc_inode_setowner(inode, private); | |
514 | d_add(dentry, inode); | |
515 | return 0; | |
516 | out_err: | |
517 | printk(KERN_WARNING "%s: %s failed to allocate inode for dentry %s\n", | |
518 | __FILE__, __func__, dentry->d_name.name); | |
519 | dput(dentry); | |
520 | return -ENOMEM; | |
521 | } | |
522 | ||
ac6fecee TM |
523 | static int __rpc_create(struct inode *dir, struct dentry *dentry, |
524 | umode_t mode, | |
525 | const struct file_operations *i_fop, | |
526 | void *private) | |
527 | { | |
528 | int err; | |
529 | ||
530 | err = __rpc_create_common(dir, dentry, S_IFREG | mode, i_fop, private); | |
531 | if (err) | |
532 | return err; | |
533 | fsnotify_create(dir, dentry); | |
534 | return 0; | |
535 | } | |
536 | ||
7589806e TM |
537 | static int __rpc_mkdir(struct inode *dir, struct dentry *dentry, |
538 | umode_t mode, | |
539 | const struct file_operations *i_fop, | |
540 | void *private) | |
541 | { | |
542 | int err; | |
543 | ||
544 | err = __rpc_create_common(dir, dentry, S_IFDIR | mode, i_fop, private); | |
545 | if (err) | |
546 | return err; | |
547 | inc_nlink(dir); | |
548 | fsnotify_mkdir(dir, dentry); | |
549 | return 0; | |
550 | } | |
551 | ||
ba9e0975 SK |
552 | static void |
553 | init_pipe(struct rpc_pipe *pipe) | |
554 | { | |
555 | pipe->nreaders = 0; | |
556 | pipe->nwriters = 0; | |
557 | INIT_LIST_HEAD(&pipe->in_upcall); | |
558 | INIT_LIST_HEAD(&pipe->in_downcall); | |
559 | INIT_LIST_HEAD(&pipe->pipe); | |
560 | pipe->pipelen = 0; | |
561 | init_waitqueue_head(&pipe->waitq); | |
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 | ||
810d90bc TM |
619 | static int __rpc_unlink(struct inode *dir, struct dentry *dentry) |
620 | { | |
621 | int ret; | |
622 | ||
623 | dget(dentry); | |
624 | ret = simple_unlink(dir, dentry); | |
625 | d_delete(dentry); | |
626 | dput(dentry); | |
627 | return ret; | |
628 | } | |
629 | ||
630 | static int __rpc_rmpipe(struct inode *dir, struct dentry *dentry) | |
631 | { | |
632 | struct inode *inode = dentry->d_inode; | |
810d90bc | 633 | |
810d90bc TM |
634 | rpc_close_pipes(inode); |
635 | return __rpc_unlink(dir, dentry); | |
636 | } | |
637 | ||
5bff0386 | 638 | static struct dentry *__rpc_lookup_create_exclusive(struct dentry *parent, |
cfeaa4a3 TM |
639 | struct qstr *name) |
640 | { | |
641 | struct dentry *dentry; | |
642 | ||
643 | dentry = d_lookup(parent, name); | |
644 | if (!dentry) { | |
645 | dentry = d_alloc(parent, name); | |
5bff0386 SK |
646 | if (!dentry) |
647 | return ERR_PTR(-ENOMEM); | |
cfeaa4a3 | 648 | } |
5bff0386 | 649 | if (dentry->d_inode == NULL) { |
fb045adb | 650 | d_set_d_op(dentry, &rpc_dentry_operations); |
cfeaa4a3 | 651 | return dentry; |
5bff0386 | 652 | } |
cfeaa4a3 TM |
653 | dput(dentry); |
654 | return ERR_PTR(-EEXIST); | |
655 | } | |
656 | ||
1da177e4 LT |
657 | /* |
658 | * FIXME: This probably has races. | |
659 | */ | |
ac6fecee TM |
660 | static void __rpc_depopulate(struct dentry *parent, |
661 | const struct rpc_filelist *files, | |
662 | int start, int eof) | |
1da177e4 LT |
663 | { |
664 | struct inode *dir = parent->d_inode; | |
ac6fecee TM |
665 | struct dentry *dentry; |
666 | struct qstr name; | |
667 | int i; | |
1da177e4 | 668 | |
ac6fecee TM |
669 | for (i = start; i < eof; i++) { |
670 | name.name = files[i].name; | |
671 | name.len = strlen(files[i].name); | |
672 | name.hash = full_name_hash(name.name, name.len); | |
673 | dentry = d_lookup(parent, &name); | |
674 | ||
675 | if (dentry == NULL) | |
62e1761c | 676 | continue; |
ac6fecee TM |
677 | if (dentry->d_inode == NULL) |
678 | goto next; | |
679 | switch (dentry->d_inode->i_mode & S_IFMT) { | |
680 | default: | |
681 | BUG(); | |
682 | case S_IFREG: | |
683 | __rpc_unlink(dir, dentry); | |
1da177e4 | 684 | break; |
ac6fecee TM |
685 | case S_IFDIR: |
686 | __rpc_rmdir(dir, dentry); | |
687 | } | |
688 | next: | |
689 | dput(dentry); | |
1da177e4 | 690 | } |
ac6fecee TM |
691 | } |
692 | ||
693 | static void rpc_depopulate(struct dentry *parent, | |
694 | const struct rpc_filelist *files, | |
695 | int start, int eof) | |
696 | { | |
697 | struct inode *dir = parent->d_inode; | |
698 | ||
699 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_CHILD); | |
700 | __rpc_depopulate(parent, files, start, eof); | |
1b1dcc1b | 701 | mutex_unlock(&dir->i_mutex); |
1da177e4 LT |
702 | } |
703 | ||
ac6fecee TM |
704 | static int rpc_populate(struct dentry *parent, |
705 | const struct rpc_filelist *files, | |
706 | int start, int eof, | |
707 | void *private) | |
1da177e4 | 708 | { |
ac6fecee | 709 | struct inode *dir = parent->d_inode; |
1da177e4 | 710 | struct dentry *dentry; |
ac6fecee | 711 | int i, err; |
1da177e4 | 712 | |
1b1dcc1b | 713 | mutex_lock(&dir->i_mutex); |
1da177e4 | 714 | for (i = start; i < eof; i++) { |
ac6fecee TM |
715 | struct qstr q; |
716 | ||
717 | q.name = files[i].name; | |
718 | q.len = strlen(files[i].name); | |
719 | q.hash = full_name_hash(q.name, q.len); | |
720 | dentry = __rpc_lookup_create_exclusive(parent, &q); | |
721 | err = PTR_ERR(dentry); | |
722 | if (IS_ERR(dentry)) | |
1da177e4 | 723 | goto out_bad; |
ac6fecee TM |
724 | switch (files[i].mode & S_IFMT) { |
725 | default: | |
726 | BUG(); | |
727 | case S_IFREG: | |
728 | err = __rpc_create(dir, dentry, | |
729 | files[i].mode, | |
730 | files[i].i_fop, | |
731 | private); | |
732 | break; | |
733 | case S_IFDIR: | |
734 | err = __rpc_mkdir(dir, dentry, | |
735 | files[i].mode, | |
736 | NULL, | |
737 | private); | |
1da177e4 | 738 | } |
ac6fecee TM |
739 | if (err != 0) |
740 | goto out_bad; | |
1da177e4 | 741 | } |
1b1dcc1b | 742 | mutex_unlock(&dir->i_mutex); |
1da177e4 LT |
743 | return 0; |
744 | out_bad: | |
ac6fecee | 745 | __rpc_depopulate(parent, files, start, eof); |
1b1dcc1b | 746 | mutex_unlock(&dir->i_mutex); |
1da177e4 | 747 | printk(KERN_WARNING "%s: %s failed to populate directory %s\n", |
0dc47877 | 748 | __FILE__, __func__, parent->d_name.name); |
ac6fecee | 749 | return err; |
f134585a | 750 | } |
1da177e4 | 751 | |
e57aed77 TM |
752 | static struct dentry *rpc_mkdir_populate(struct dentry *parent, |
753 | struct qstr *name, umode_t mode, void *private, | |
754 | int (*populate)(struct dentry *, void *), void *args_populate) | |
f134585a | 755 | { |
f134585a | 756 | struct dentry *dentry; |
7d59d1e8 | 757 | struct inode *dir = parent->d_inode; |
f134585a TM |
758 | int error; |
759 | ||
7d59d1e8 TM |
760 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); |
761 | dentry = __rpc_lookup_create_exclusive(parent, name); | |
f134585a | 762 | if (IS_ERR(dentry)) |
7d59d1e8 TM |
763 | goto out; |
764 | error = __rpc_mkdir(dir, dentry, mode, NULL, private); | |
7589806e TM |
765 | if (error != 0) |
766 | goto out_err; | |
e57aed77 TM |
767 | if (populate != NULL) { |
768 | error = populate(dentry, args_populate); | |
769 | if (error) | |
770 | goto err_rmdir; | |
771 | } | |
f134585a | 772 | out: |
1b1dcc1b | 773 | mutex_unlock(&dir->i_mutex); |
5c3e985a | 774 | return dentry; |
ac6fecee | 775 | err_rmdir: |
f134585a | 776 | __rpc_rmdir(dir, dentry); |
7589806e | 777 | out_err: |
f134585a TM |
778 | dentry = ERR_PTR(error); |
779 | goto out; | |
1da177e4 LT |
780 | } |
781 | ||
e57aed77 TM |
782 | static int rpc_rmdir_depopulate(struct dentry *dentry, |
783 | void (*depopulate)(struct dentry *)) | |
1da177e4 | 784 | { |
dff02cc1 | 785 | struct dentry *parent; |
f134585a TM |
786 | struct inode *dir; |
787 | int error; | |
278c995c | 788 | |
dff02cc1 TM |
789 | parent = dget_parent(dentry); |
790 | dir = parent->d_inode; | |
c6573c29 | 791 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); |
e57aed77 TM |
792 | if (depopulate != NULL) |
793 | depopulate(dentry); | |
f134585a | 794 | error = __rpc_rmdir(dir, dentry); |
1b1dcc1b | 795 | mutex_unlock(&dir->i_mutex); |
dff02cc1 | 796 | dput(parent); |
f134585a | 797 | return error; |
1da177e4 LT |
798 | } |
799 | ||
93a44a75 BF |
800 | /** |
801 | * rpc_mkpipe - make an rpc_pipefs file for kernel<->userspace communication | |
802 | * @parent: dentry of directory to create new "pipe" in | |
803 | * @name: name of pipe | |
804 | * @private: private data to associate with the pipe, for the caller's use | |
805 | * @ops: operations defining the behavior of the pipe: upcall, downcall, | |
c3810608 | 806 | * release_pipe, open_pipe, and destroy_msg. |
d0fe13ba | 807 | * @flags: rpc_pipe flags |
93a44a75 BF |
808 | * |
809 | * Data is made available for userspace to read by calls to | |
810 | * rpc_queue_upcall(). The actual reads will result in calls to | |
811 | * @ops->upcall, which will be called with the file pointer, | |
812 | * message, and userspace buffer to copy to. | |
813 | * | |
814 | * Writes can come at any time, and do not necessarily have to be | |
815 | * responses to upcalls. They will result in calls to @msg->downcall. | |
816 | * | |
817 | * The @private argument passed here will be available to all these methods | |
818 | * from the file pointer, via RPC_I(file->f_dentry->d_inode)->private. | |
819 | */ | |
c239d83b SK |
820 | struct dentry *rpc_mkpipe_dentry(struct dentry *parent, const char *name, |
821 | void *private, struct rpc_pipe *pipe) | |
1da177e4 | 822 | { |
1da177e4 | 823 | struct dentry *dentry; |
7589806e | 824 | struct inode *dir = parent->d_inode; |
7364af6a | 825 | umode_t umode = S_IFIFO | S_IRUSR | S_IWUSR; |
cfeaa4a3 | 826 | struct qstr q; |
7589806e | 827 | int err; |
7364af6a | 828 | |
c239d83b | 829 | if (pipe->ops->upcall == NULL) |
7364af6a | 830 | umode &= ~S_IRUGO; |
c239d83b | 831 | if (pipe->ops->downcall == NULL) |
7364af6a | 832 | umode &= ~S_IWUGO; |
1da177e4 | 833 | |
cfeaa4a3 TM |
834 | q.name = name; |
835 | q.len = strlen(name); | |
836 | q.hash = full_name_hash(q.name, q.len), | |
837 | ||
838 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); | |
5bff0386 | 839 | dentry = __rpc_lookup_create_exclusive(parent, &q); |
1da177e4 | 840 | if (IS_ERR(dentry)) |
cfeaa4a3 | 841 | goto out; |
c239d83b SK |
842 | err = __rpc_mkpipe_dentry(dir, dentry, umode, &rpc_pipe_fops, |
843 | private, pipe); | |
7589806e TM |
844 | if (err) |
845 | goto out_err; | |
f134585a | 846 | out: |
1b1dcc1b | 847 | mutex_unlock(&dir->i_mutex); |
5c3e985a | 848 | return dentry; |
7589806e TM |
849 | out_err: |
850 | dentry = ERR_PTR(err); | |
158998b6 | 851 | printk(KERN_WARNING "%s: %s() failed to create pipe %s/%s (errno = %d)\n", |
0dc47877 | 852 | __FILE__, __func__, parent->d_name.name, name, |
7589806e | 853 | err); |
f134585a | 854 | goto out; |
1da177e4 | 855 | } |
c239d83b | 856 | EXPORT_SYMBOL_GPL(rpc_mkpipe_dentry); |
1da177e4 | 857 | |
93a44a75 BF |
858 | /** |
859 | * rpc_unlink - remove a pipe | |
860 | * @dentry: dentry for the pipe, as returned from rpc_mkpipe | |
861 | * | |
862 | * After this call, lookups will no longer find the pipe, and any | |
863 | * attempts to read or write using preexisting opens of the pipe will | |
864 | * return -EPIPE. | |
865 | */ | |
f134585a | 866 | int |
5d67476f | 867 | rpc_unlink(struct dentry *dentry) |
1da177e4 | 868 | { |
5d67476f | 869 | struct dentry *parent; |
f134585a | 870 | struct inode *dir; |
5d67476f | 871 | int error = 0; |
1da177e4 | 872 | |
5d67476f TM |
873 | parent = dget_parent(dentry); |
874 | dir = parent->d_inode; | |
c6573c29 | 875 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); |
810d90bc | 876 | error = __rpc_rmpipe(dir, dentry); |
1b1dcc1b | 877 | mutex_unlock(&dir->i_mutex); |
5d67476f | 878 | dput(parent); |
f134585a | 879 | return error; |
1da177e4 | 880 | } |
468039ee | 881 | EXPORT_SYMBOL_GPL(rpc_unlink); |
1da177e4 | 882 | |
e57aed77 TM |
883 | enum { |
884 | RPCAUTH_info, | |
885 | RPCAUTH_EOF | |
886 | }; | |
887 | ||
888 | static const struct rpc_filelist authfiles[] = { | |
889 | [RPCAUTH_info] = { | |
890 | .name = "info", | |
891 | .i_fop = &rpc_info_operations, | |
892 | .mode = S_IFREG | S_IRUSR, | |
893 | }, | |
894 | }; | |
895 | ||
896 | static int rpc_clntdir_populate(struct dentry *dentry, void *private) | |
897 | { | |
898 | return rpc_populate(dentry, | |
899 | authfiles, RPCAUTH_info, RPCAUTH_EOF, | |
900 | private); | |
901 | } | |
902 | ||
903 | static void rpc_clntdir_depopulate(struct dentry *dentry) | |
904 | { | |
905 | rpc_depopulate(dentry, authfiles, RPCAUTH_info, RPCAUTH_EOF); | |
906 | } | |
907 | ||
7d59d1e8 TM |
908 | /** |
909 | * rpc_create_client_dir - Create a new rpc_client directory in rpc_pipefs | |
4111d4fd RD |
910 | * @dentry: dentry from the rpc_pipefs root to the new directory |
911 | * @name: &struct qstr for the name | |
7d59d1e8 TM |
912 | * @rpc_client: rpc client to associate with this directory |
913 | * | |
914 | * This creates a directory at the given @path associated with | |
915 | * @rpc_clnt, which will contain a file named "info" with some basic | |
916 | * information about the client, together with any "pipes" that may | |
917 | * later be created using rpc_mkpipe(). | |
918 | */ | |
23ac6581 | 919 | struct dentry *rpc_create_client_dir(struct dentry *dentry, |
e57aed77 TM |
920 | struct qstr *name, |
921 | struct rpc_clnt *rpc_client) | |
922 | { | |
923 | return rpc_mkdir_populate(dentry, name, S_IRUGO | S_IXUGO, NULL, | |
924 | rpc_clntdir_populate, rpc_client); | |
925 | } | |
926 | ||
927 | /** | |
928 | * rpc_remove_client_dir - Remove a directory created with rpc_create_client_dir() | |
80df9d20 | 929 | * @clnt: rpc client |
e57aed77 TM |
930 | */ |
931 | int rpc_remove_client_dir(struct dentry *dentry) | |
7d59d1e8 | 932 | { |
e57aed77 | 933 | return rpc_rmdir_depopulate(dentry, rpc_clntdir_depopulate); |
7d59d1e8 TM |
934 | } |
935 | ||
8854e82d TM |
936 | static const struct rpc_filelist cache_pipefs_files[3] = { |
937 | [0] = { | |
938 | .name = "channel", | |
939 | .i_fop = &cache_file_operations_pipefs, | |
96c61cbd | 940 | .mode = S_IFREG|S_IRUSR|S_IWUSR, |
8854e82d TM |
941 | }, |
942 | [1] = { | |
943 | .name = "content", | |
944 | .i_fop = &content_file_operations_pipefs, | |
945 | .mode = S_IFREG|S_IRUSR, | |
946 | }, | |
947 | [2] = { | |
948 | .name = "flush", | |
949 | .i_fop = &cache_flush_operations_pipefs, | |
950 | .mode = S_IFREG|S_IRUSR|S_IWUSR, | |
951 | }, | |
952 | }; | |
953 | ||
954 | static int rpc_cachedir_populate(struct dentry *dentry, void *private) | |
955 | { | |
956 | return rpc_populate(dentry, | |
957 | cache_pipefs_files, 0, 3, | |
958 | private); | |
959 | } | |
960 | ||
961 | static void rpc_cachedir_depopulate(struct dentry *dentry) | |
962 | { | |
963 | rpc_depopulate(dentry, cache_pipefs_files, 0, 3); | |
964 | } | |
965 | ||
966 | struct dentry *rpc_create_cache_dir(struct dentry *parent, struct qstr *name, | |
64f1426f | 967 | umode_t umode, struct cache_detail *cd) |
8854e82d TM |
968 | { |
969 | return rpc_mkdir_populate(parent, name, umode, NULL, | |
970 | rpc_cachedir_populate, cd); | |
971 | } | |
972 | ||
973 | void rpc_remove_cache_dir(struct dentry *dentry) | |
974 | { | |
975 | rpc_rmdir_depopulate(dentry, rpc_cachedir_depopulate); | |
976 | } | |
977 | ||
1da177e4 LT |
978 | /* |
979 | * populate the filesystem | |
980 | */ | |
b87221de | 981 | static const struct super_operations s_ops = { |
1da177e4 LT |
982 | .alloc_inode = rpc_alloc_inode, |
983 | .destroy_inode = rpc_destroy_inode, | |
984 | .statfs = simple_statfs, | |
985 | }; | |
986 | ||
987 | #define RPCAUTH_GSSMAGIC 0x67596969 | |
988 | ||
bb156749 TM |
989 | /* |
990 | * We have a single directory with 1 node in it. | |
991 | */ | |
992 | enum { | |
993 | RPCAUTH_lockd, | |
994 | RPCAUTH_mount, | |
995 | RPCAUTH_nfs, | |
996 | RPCAUTH_portmap, | |
997 | RPCAUTH_statd, | |
998 | RPCAUTH_nfsd4_cb, | |
e571cbf1 | 999 | RPCAUTH_cache, |
bb156749 TM |
1000 | RPCAUTH_RootEOF |
1001 | }; | |
1002 | ||
1003 | static const struct rpc_filelist files[] = { | |
1004 | [RPCAUTH_lockd] = { | |
1005 | .name = "lockd", | |
1006 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
1007 | }, | |
1008 | [RPCAUTH_mount] = { | |
1009 | .name = "mount", | |
1010 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
1011 | }, | |
1012 | [RPCAUTH_nfs] = { | |
1013 | .name = "nfs", | |
1014 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
1015 | }, | |
1016 | [RPCAUTH_portmap] = { | |
1017 | .name = "portmap", | |
1018 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
1019 | }, | |
1020 | [RPCAUTH_statd] = { | |
1021 | .name = "statd", | |
1022 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
1023 | }, | |
1024 | [RPCAUTH_nfsd4_cb] = { | |
1025 | .name = "nfsd4_cb", | |
1026 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
1027 | }, | |
e571cbf1 TM |
1028 | [RPCAUTH_cache] = { |
1029 | .name = "cache", | |
1030 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
1031 | }, | |
bb156749 TM |
1032 | }; |
1033 | ||
432eb1a5 SK |
1034 | /* |
1035 | * This call can be used only in RPC pipefs mount notification hooks. | |
1036 | */ | |
1037 | struct dentry *rpc_d_lookup_sb(const struct super_block *sb, | |
1038 | const unsigned char *dir_name) | |
1039 | { | |
1040 | struct qstr dir = { | |
1041 | .name = dir_name, | |
1042 | .len = strlen(dir_name), | |
1043 | .hash = full_name_hash(dir_name, strlen(dir_name)), | |
1044 | }; | |
1045 | ||
1046 | return d_lookup(sb->s_root, &dir); | |
1047 | } | |
1048 | EXPORT_SYMBOL_GPL(rpc_d_lookup_sb); | |
1049 | ||
c21a588f SK |
1050 | void rpc_pipefs_init_net(struct net *net) |
1051 | { | |
1052 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
1053 | ||
1054 | mutex_init(&sn->pipefs_sb_lock); | |
1055 | } | |
1056 | ||
1057 | /* | |
1058 | * This call will be used for per network namespace operations calls. | |
1059 | * Note: Function will be returned with pipefs_sb_lock taken if superblock was | |
1060 | * found. This lock have to be released by rpc_put_sb_net() when all operations | |
1061 | * will be completed. | |
1062 | */ | |
1063 | struct super_block *rpc_get_sb_net(const struct net *net) | |
1064 | { | |
1065 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
1066 | ||
1067 | mutex_lock(&sn->pipefs_sb_lock); | |
1068 | if (sn->pipefs_sb) | |
1069 | return sn->pipefs_sb; | |
1070 | mutex_unlock(&sn->pipefs_sb_lock); | |
1071 | return NULL; | |
1072 | } | |
1073 | EXPORT_SYMBOL_GPL(rpc_get_sb_net); | |
1074 | ||
1075 | void rpc_put_sb_net(const struct net *net) | |
1076 | { | |
1077 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
1078 | ||
1079 | BUG_ON(sn->pipefs_sb == NULL); | |
1080 | mutex_unlock(&sn->pipefs_sb_lock); | |
1081 | } | |
1082 | EXPORT_SYMBOL_GPL(rpc_put_sb_net); | |
1083 | ||
1da177e4 LT |
1084 | static int |
1085 | rpc_fill_super(struct super_block *sb, void *data, int silent) | |
1086 | { | |
1087 | struct inode *inode; | |
1088 | struct dentry *root; | |
38b0da75 | 1089 | struct net *net = data; |
90c4e829 | 1090 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
2d00131a | 1091 | int err; |
1da177e4 LT |
1092 | |
1093 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
1094 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
1095 | sb->s_magic = RPCAUTH_GSSMAGIC; | |
1096 | sb->s_op = &s_ops; | |
1097 | sb->s_time_gran = 1; | |
1098 | ||
1099 | inode = rpc_get_inode(sb, S_IFDIR | 0755); | |
1100 | if (!inode) | |
1101 | return -ENOMEM; | |
fc7bed8c | 1102 | sb->s_root = root = d_alloc_root(inode); |
1da177e4 LT |
1103 | if (!root) { |
1104 | iput(inode); | |
1105 | return -ENOMEM; | |
1106 | } | |
ac6fecee | 1107 | if (rpc_populate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF, NULL)) |
fc7bed8c | 1108 | return -ENOMEM; |
efc46bf2 SK |
1109 | dprintk("RPC: sending pipefs MOUNT notification for net %p%s\n", net, |
1110 | NET_NAME(net)); | |
2d00131a SK |
1111 | err = blocking_notifier_call_chain(&rpc_pipefs_notifier_list, |
1112 | RPC_PIPEFS_MOUNT, | |
1113 | sb); | |
1114 | if (err) | |
1115 | goto err_depopulate; | |
021c68de | 1116 | sb->s_fs_info = get_net(net); |
90c4e829 | 1117 | sn->pipefs_sb = sb; |
1da177e4 | 1118 | return 0; |
2d00131a SK |
1119 | |
1120 | err_depopulate: | |
1121 | blocking_notifier_call_chain(&rpc_pipefs_notifier_list, | |
1122 | RPC_PIPEFS_UMOUNT, | |
1123 | sb); | |
1124 | __rpc_depopulate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF); | |
1125 | return err; | |
1da177e4 LT |
1126 | } |
1127 | ||
fc14f2fe AV |
1128 | static struct dentry * |
1129 | rpc_mount(struct file_system_type *fs_type, | |
1130 | int flags, const char *dev_name, void *data) | |
1da177e4 | 1131 | { |
38b0da75 | 1132 | return mount_ns(fs_type, flags, current->nsproxy->net_ns, rpc_fill_super); |
1da177e4 LT |
1133 | } |
1134 | ||
021c68de SK |
1135 | void rpc_kill_sb(struct super_block *sb) |
1136 | { | |
1137 | struct net *net = sb->s_fs_info; | |
90c4e829 | 1138 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
021c68de | 1139 | |
c21a588f | 1140 | mutex_lock(&sn->pipefs_sb_lock); |
90c4e829 | 1141 | sn->pipefs_sb = NULL; |
c21a588f | 1142 | mutex_unlock(&sn->pipefs_sb_lock); |
021c68de | 1143 | put_net(net); |
efc46bf2 SK |
1144 | dprintk("RPC: sending pipefs UMOUNT notification for net %p%s\n", net, |
1145 | NET_NAME(net)); | |
2d00131a SK |
1146 | blocking_notifier_call_chain(&rpc_pipefs_notifier_list, |
1147 | RPC_PIPEFS_UMOUNT, | |
1148 | sb); | |
021c68de SK |
1149 | kill_litter_super(sb); |
1150 | } | |
1151 | ||
1da177e4 LT |
1152 | static struct file_system_type rpc_pipe_fs_type = { |
1153 | .owner = THIS_MODULE, | |
1154 | .name = "rpc_pipefs", | |
fc14f2fe | 1155 | .mount = rpc_mount, |
021c68de | 1156 | .kill_sb = rpc_kill_sb, |
1da177e4 LT |
1157 | }; |
1158 | ||
1159 | static void | |
51cc5068 | 1160 | init_once(void *foo) |
1da177e4 LT |
1161 | { |
1162 | struct rpc_inode *rpci = (struct rpc_inode *) foo; | |
1163 | ||
a35afb83 CL |
1164 | inode_init_once(&rpci->vfs_inode); |
1165 | rpci->private = NULL; | |
ba9e0975 | 1166 | rpci->pipe = NULL; |
1da177e4 LT |
1167 | } |
1168 | ||
1169 | int register_rpc_pipefs(void) | |
1170 | { | |
5bd5f581 AM |
1171 | int err; |
1172 | ||
1da177e4 | 1173 | rpc_inode_cachep = kmem_cache_create("rpc_inode_cache", |
fffb60f9 PJ |
1174 | sizeof(struct rpc_inode), |
1175 | 0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| | |
1176 | SLAB_MEM_SPREAD), | |
20c2df83 | 1177 | init_once); |
1da177e4 LT |
1178 | if (!rpc_inode_cachep) |
1179 | return -ENOMEM; | |
80df9d20 SK |
1180 | err = rpc_clients_notifier_register(); |
1181 | if (err) | |
1182 | goto err_notifier; | |
5bd5f581 | 1183 | err = register_filesystem(&rpc_pipe_fs_type); |
80df9d20 SK |
1184 | if (err) |
1185 | goto err_register; | |
1da177e4 | 1186 | return 0; |
80df9d20 SK |
1187 | |
1188 | err_register: | |
1189 | rpc_clients_notifier_unregister(); | |
1190 | err_notifier: | |
1191 | kmem_cache_destroy(rpc_inode_cachep); | |
1192 | return err; | |
1da177e4 LT |
1193 | } |
1194 | ||
1195 | void unregister_rpc_pipefs(void) | |
1196 | { | |
80df9d20 | 1197 | rpc_clients_notifier_unregister(); |
1a1d92c1 | 1198 | kmem_cache_destroy(rpc_inode_cachep); |
1da177e4 LT |
1199 | unregister_filesystem(&rpc_pipe_fs_type); |
1200 | } | |
dcbf8c30 MS |
1201 | |
1202 | /* Make 'mount -t rpc_pipefs ...' autoload this module. */ | |
1203 | MODULE_ALIAS("rpc_pipefs"); |