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Commit | Line | Data |
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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 | */ | |
11 | #include <linux/config.h> | |
12 | #include <linux/module.h> | |
13 | #include <linux/slab.h> | |
14 | #include <linux/string.h> | |
15 | #include <linux/pagemap.h> | |
16 | #include <linux/mount.h> | |
17 | #include <linux/namei.h> | |
18 | #include <linux/dnotify.h> | |
19 | #include <linux/kernel.h> | |
20 | ||
21 | #include <asm/ioctls.h> | |
22 | #include <linux/fs.h> | |
23 | #include <linux/poll.h> | |
24 | #include <linux/wait.h> | |
25 | #include <linux/seq_file.h> | |
26 | ||
27 | #include <linux/sunrpc/clnt.h> | |
28 | #include <linux/workqueue.h> | |
29 | #include <linux/sunrpc/rpc_pipe_fs.h> | |
30 | ||
ba89966c | 31 | static struct vfsmount *rpc_mount __read_mostly; |
1da177e4 LT |
32 | static int rpc_mount_count; |
33 | ||
34 | static struct file_system_type rpc_pipe_fs_type; | |
35 | ||
36 | ||
ba89966c | 37 | static kmem_cache_t *rpc_inode_cachep __read_mostly; |
1da177e4 LT |
38 | |
39 | #define RPC_UPCALL_TIMEOUT (30*HZ) | |
40 | ||
9842ef35 TM |
41 | static void rpc_purge_list(struct rpc_inode *rpci, struct list_head *head, |
42 | void (*destroy_msg)(struct rpc_pipe_msg *), int err) | |
1da177e4 | 43 | { |
1da177e4 LT |
44 | struct rpc_pipe_msg *msg; |
45 | ||
9842ef35 TM |
46 | if (list_empty(head)) |
47 | return; | |
48 | do { | |
b3eb67a2 | 49 | msg = list_entry(head->next, struct rpc_pipe_msg, list); |
9842ef35 | 50 | list_del(&msg->list); |
1da177e4 | 51 | msg->errno = err; |
b3eb67a2 | 52 | destroy_msg(msg); |
9842ef35 | 53 | } while (!list_empty(head)); |
1da177e4 LT |
54 | wake_up(&rpci->waitq); |
55 | } | |
56 | ||
57 | static void | |
58 | rpc_timeout_upcall_queue(void *data) | |
59 | { | |
9842ef35 | 60 | LIST_HEAD(free_list); |
1da177e4 LT |
61 | struct rpc_inode *rpci = (struct rpc_inode *)data; |
62 | struct inode *inode = &rpci->vfs_inode; | |
9842ef35 | 63 | void (*destroy_msg)(struct rpc_pipe_msg *); |
1da177e4 | 64 | |
9842ef35 TM |
65 | spin_lock(&inode->i_lock); |
66 | if (rpci->ops == NULL) { | |
67 | spin_unlock(&inode->i_lock); | |
68 | return; | |
69 | } | |
70 | destroy_msg = rpci->ops->destroy_msg; | |
71 | if (rpci->nreaders == 0) { | |
72 | list_splice_init(&rpci->pipe, &free_list); | |
73 | rpci->pipelen = 0; | |
74 | } | |
75 | spin_unlock(&inode->i_lock); | |
76 | rpc_purge_list(rpci, &free_list, destroy_msg, -ETIMEDOUT); | |
1da177e4 LT |
77 | } |
78 | ||
79 | int | |
80 | rpc_queue_upcall(struct inode *inode, struct rpc_pipe_msg *msg) | |
81 | { | |
82 | struct rpc_inode *rpci = RPC_I(inode); | |
6070fe6f | 83 | int res = -EPIPE; |
1da177e4 | 84 | |
9842ef35 | 85 | spin_lock(&inode->i_lock); |
6070fe6f TM |
86 | if (rpci->ops == NULL) |
87 | goto out; | |
1da177e4 LT |
88 | if (rpci->nreaders) { |
89 | list_add_tail(&msg->list, &rpci->pipe); | |
90 | rpci->pipelen += msg->len; | |
6070fe6f | 91 | res = 0; |
1da177e4 LT |
92 | } else if (rpci->flags & RPC_PIPE_WAIT_FOR_OPEN) { |
93 | if (list_empty(&rpci->pipe)) | |
94 | schedule_delayed_work(&rpci->queue_timeout, | |
95 | RPC_UPCALL_TIMEOUT); | |
96 | list_add_tail(&msg->list, &rpci->pipe); | |
97 | rpci->pipelen += msg->len; | |
6070fe6f TM |
98 | res = 0; |
99 | } | |
100 | out: | |
9842ef35 | 101 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
102 | wake_up(&rpci->waitq); |
103 | return res; | |
104 | } | |
105 | ||
6070fe6f TM |
106 | static inline void |
107 | rpc_inode_setowner(struct inode *inode, void *private) | |
108 | { | |
109 | RPC_I(inode)->private = private; | |
110 | } | |
111 | ||
1da177e4 LT |
112 | static void |
113 | rpc_close_pipes(struct inode *inode) | |
114 | { | |
115 | struct rpc_inode *rpci = RPC_I(inode); | |
9842ef35 | 116 | struct rpc_pipe_ops *ops; |
1da177e4 | 117 | |
1b1dcc1b | 118 | mutex_lock(&inode->i_mutex); |
9842ef35 TM |
119 | ops = rpci->ops; |
120 | if (ops != NULL) { | |
121 | LIST_HEAD(free_list); | |
122 | ||
123 | spin_lock(&inode->i_lock); | |
1da177e4 | 124 | rpci->nreaders = 0; |
9842ef35 TM |
125 | list_splice_init(&rpci->in_upcall, &free_list); |
126 | list_splice_init(&rpci->pipe, &free_list); | |
127 | rpci->pipelen = 0; | |
1da177e4 | 128 | rpci->ops = NULL; |
9842ef35 TM |
129 | spin_unlock(&inode->i_lock); |
130 | rpc_purge_list(rpci, &free_list, ops->destroy_msg, -EPIPE); | |
131 | rpci->nwriters = 0; | |
132 | if (ops->release_pipe) | |
133 | ops->release_pipe(inode); | |
134 | cancel_delayed_work(&rpci->queue_timeout); | |
135 | flush_scheduled_work(); | |
1da177e4 | 136 | } |
6070fe6f | 137 | rpc_inode_setowner(inode, NULL); |
1b1dcc1b | 138 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
139 | } |
140 | ||
1da177e4 LT |
141 | static struct inode * |
142 | rpc_alloc_inode(struct super_block *sb) | |
143 | { | |
144 | struct rpc_inode *rpci; | |
145 | rpci = (struct rpc_inode *)kmem_cache_alloc(rpc_inode_cachep, SLAB_KERNEL); | |
146 | if (!rpci) | |
147 | return NULL; | |
148 | return &rpci->vfs_inode; | |
149 | } | |
150 | ||
151 | static void | |
152 | rpc_destroy_inode(struct inode *inode) | |
153 | { | |
154 | kmem_cache_free(rpc_inode_cachep, RPC_I(inode)); | |
155 | } | |
156 | ||
157 | static int | |
158 | rpc_pipe_open(struct inode *inode, struct file *filp) | |
159 | { | |
160 | struct rpc_inode *rpci = RPC_I(inode); | |
161 | int res = -ENXIO; | |
162 | ||
1b1dcc1b | 163 | mutex_lock(&inode->i_mutex); |
1da177e4 LT |
164 | if (rpci->ops != NULL) { |
165 | if (filp->f_mode & FMODE_READ) | |
166 | rpci->nreaders ++; | |
167 | if (filp->f_mode & FMODE_WRITE) | |
168 | rpci->nwriters ++; | |
169 | res = 0; | |
170 | } | |
1b1dcc1b | 171 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
172 | return res; |
173 | } | |
174 | ||
175 | static int | |
176 | rpc_pipe_release(struct inode *inode, struct file *filp) | |
177 | { | |
969b7f25 | 178 | struct rpc_inode *rpci = RPC_I(inode); |
1da177e4 LT |
179 | struct rpc_pipe_msg *msg; |
180 | ||
1b1dcc1b | 181 | mutex_lock(&inode->i_mutex); |
1da177e4 LT |
182 | if (rpci->ops == NULL) |
183 | goto out; | |
184 | msg = (struct rpc_pipe_msg *)filp->private_data; | |
185 | if (msg != NULL) { | |
9842ef35 | 186 | spin_lock(&inode->i_lock); |
48e49187 | 187 | msg->errno = -EAGAIN; |
9842ef35 TM |
188 | list_del(&msg->list); |
189 | spin_unlock(&inode->i_lock); | |
1da177e4 LT |
190 | rpci->ops->destroy_msg(msg); |
191 | } | |
192 | if (filp->f_mode & FMODE_WRITE) | |
193 | rpci->nwriters --; | |
9842ef35 | 194 | if (filp->f_mode & FMODE_READ) { |
1da177e4 | 195 | rpci->nreaders --; |
9842ef35 TM |
196 | if (rpci->nreaders == 0) { |
197 | LIST_HEAD(free_list); | |
198 | spin_lock(&inode->i_lock); | |
199 | list_splice_init(&rpci->pipe, &free_list); | |
200 | rpci->pipelen = 0; | |
201 | spin_unlock(&inode->i_lock); | |
202 | rpc_purge_list(rpci, &free_list, | |
203 | rpci->ops->destroy_msg, -EAGAIN); | |
204 | } | |
205 | } | |
1da177e4 LT |
206 | if (rpci->ops->release_pipe) |
207 | rpci->ops->release_pipe(inode); | |
208 | out: | |
1b1dcc1b | 209 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
210 | return 0; |
211 | } | |
212 | ||
213 | static ssize_t | |
214 | rpc_pipe_read(struct file *filp, char __user *buf, size_t len, loff_t *offset) | |
215 | { | |
216 | struct inode *inode = filp->f_dentry->d_inode; | |
217 | struct rpc_inode *rpci = RPC_I(inode); | |
218 | struct rpc_pipe_msg *msg; | |
219 | int res = 0; | |
220 | ||
1b1dcc1b | 221 | mutex_lock(&inode->i_mutex); |
1da177e4 LT |
222 | if (rpci->ops == NULL) { |
223 | res = -EPIPE; | |
224 | goto out_unlock; | |
225 | } | |
226 | msg = filp->private_data; | |
227 | if (msg == NULL) { | |
9842ef35 | 228 | spin_lock(&inode->i_lock); |
1da177e4 LT |
229 | if (!list_empty(&rpci->pipe)) { |
230 | msg = list_entry(rpci->pipe.next, | |
231 | struct rpc_pipe_msg, | |
232 | list); | |
233 | list_move(&msg->list, &rpci->in_upcall); | |
234 | rpci->pipelen -= msg->len; | |
235 | filp->private_data = msg; | |
236 | msg->copied = 0; | |
237 | } | |
9842ef35 | 238 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
239 | if (msg == NULL) |
240 | goto out_unlock; | |
241 | } | |
242 | /* NOTE: it is up to the callback to update msg->copied */ | |
243 | res = rpci->ops->upcall(filp, msg, buf, len); | |
244 | if (res < 0 || msg->len == msg->copied) { | |
245 | filp->private_data = NULL; | |
9842ef35 TM |
246 | spin_lock(&inode->i_lock); |
247 | list_del(&msg->list); | |
248 | spin_unlock(&inode->i_lock); | |
1da177e4 LT |
249 | rpci->ops->destroy_msg(msg); |
250 | } | |
251 | out_unlock: | |
1b1dcc1b | 252 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
253 | return res; |
254 | } | |
255 | ||
256 | static ssize_t | |
257 | rpc_pipe_write(struct file *filp, const char __user *buf, size_t len, loff_t *offset) | |
258 | { | |
259 | struct inode *inode = filp->f_dentry->d_inode; | |
260 | struct rpc_inode *rpci = RPC_I(inode); | |
261 | int res; | |
262 | ||
1b1dcc1b | 263 | mutex_lock(&inode->i_mutex); |
1da177e4 LT |
264 | res = -EPIPE; |
265 | if (rpci->ops != NULL) | |
266 | res = rpci->ops->downcall(filp, buf, len); | |
1b1dcc1b | 267 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
268 | return res; |
269 | } | |
270 | ||
271 | static unsigned int | |
272 | rpc_pipe_poll(struct file *filp, struct poll_table_struct *wait) | |
273 | { | |
274 | struct rpc_inode *rpci; | |
275 | unsigned int mask = 0; | |
276 | ||
277 | rpci = RPC_I(filp->f_dentry->d_inode); | |
278 | poll_wait(filp, &rpci->waitq, wait); | |
279 | ||
280 | mask = POLLOUT | POLLWRNORM; | |
281 | if (rpci->ops == NULL) | |
282 | mask |= POLLERR | POLLHUP; | |
283 | if (!list_empty(&rpci->pipe)) | |
284 | mask |= POLLIN | POLLRDNORM; | |
285 | return mask; | |
286 | } | |
287 | ||
288 | static int | |
289 | rpc_pipe_ioctl(struct inode *ino, struct file *filp, | |
290 | unsigned int cmd, unsigned long arg) | |
291 | { | |
292 | struct rpc_inode *rpci = RPC_I(filp->f_dentry->d_inode); | |
293 | int len; | |
294 | ||
295 | switch (cmd) { | |
296 | case FIONREAD: | |
297 | if (rpci->ops == NULL) | |
298 | return -EPIPE; | |
299 | len = rpci->pipelen; | |
300 | if (filp->private_data) { | |
301 | struct rpc_pipe_msg *msg; | |
302 | msg = (struct rpc_pipe_msg *)filp->private_data; | |
303 | len += msg->len - msg->copied; | |
304 | } | |
305 | return put_user(len, (int __user *)arg); | |
306 | default: | |
307 | return -EINVAL; | |
308 | } | |
309 | } | |
310 | ||
311 | static struct file_operations rpc_pipe_fops = { | |
312 | .owner = THIS_MODULE, | |
313 | .llseek = no_llseek, | |
314 | .read = rpc_pipe_read, | |
315 | .write = rpc_pipe_write, | |
316 | .poll = rpc_pipe_poll, | |
317 | .ioctl = rpc_pipe_ioctl, | |
318 | .open = rpc_pipe_open, | |
319 | .release = rpc_pipe_release, | |
320 | }; | |
321 | ||
322 | static int | |
323 | rpc_show_info(struct seq_file *m, void *v) | |
324 | { | |
325 | struct rpc_clnt *clnt = m->private; | |
326 | ||
327 | seq_printf(m, "RPC server: %s\n", clnt->cl_server); | |
328 | seq_printf(m, "service: %s (%d) version %d\n", clnt->cl_protname, | |
329 | clnt->cl_prog, clnt->cl_vers); | |
330 | seq_printf(m, "address: %u.%u.%u.%u\n", | |
331 | NIPQUAD(clnt->cl_xprt->addr.sin_addr.s_addr)); | |
332 | seq_printf(m, "protocol: %s\n", | |
333 | clnt->cl_xprt->prot == IPPROTO_UDP ? "udp" : "tcp"); | |
334 | return 0; | |
335 | } | |
336 | ||
337 | static int | |
338 | rpc_info_open(struct inode *inode, struct file *file) | |
339 | { | |
340 | struct rpc_clnt *clnt; | |
341 | int ret = single_open(file, rpc_show_info, NULL); | |
342 | ||
343 | if (!ret) { | |
344 | struct seq_file *m = file->private_data; | |
1b1dcc1b | 345 | mutex_lock(&inode->i_mutex); |
1da177e4 LT |
346 | clnt = RPC_I(inode)->private; |
347 | if (clnt) { | |
348 | atomic_inc(&clnt->cl_users); | |
349 | m->private = clnt; | |
350 | } else { | |
351 | single_release(inode, file); | |
352 | ret = -EINVAL; | |
353 | } | |
1b1dcc1b | 354 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
355 | } |
356 | return ret; | |
357 | } | |
358 | ||
359 | static int | |
360 | rpc_info_release(struct inode *inode, struct file *file) | |
361 | { | |
362 | struct seq_file *m = file->private_data; | |
363 | struct rpc_clnt *clnt = (struct rpc_clnt *)m->private; | |
364 | ||
365 | if (clnt) | |
366 | rpc_release_client(clnt); | |
367 | return single_release(inode, file); | |
368 | } | |
369 | ||
370 | static struct file_operations rpc_info_operations = { | |
371 | .owner = THIS_MODULE, | |
372 | .open = rpc_info_open, | |
373 | .read = seq_read, | |
374 | .llseek = seq_lseek, | |
375 | .release = rpc_info_release, | |
376 | }; | |
377 | ||
378 | ||
379 | /* | |
380 | * We have a single directory with 1 node in it. | |
381 | */ | |
382 | enum { | |
383 | RPCAUTH_Root = 1, | |
384 | RPCAUTH_lockd, | |
385 | RPCAUTH_mount, | |
386 | RPCAUTH_nfs, | |
387 | RPCAUTH_portmap, | |
388 | RPCAUTH_statd, | |
389 | RPCAUTH_RootEOF | |
390 | }; | |
391 | ||
392 | /* | |
393 | * Description of fs contents. | |
394 | */ | |
395 | struct rpc_filelist { | |
396 | char *name; | |
397 | struct file_operations *i_fop; | |
398 | int mode; | |
399 | }; | |
400 | ||
401 | static struct rpc_filelist files[] = { | |
402 | [RPCAUTH_lockd] = { | |
403 | .name = "lockd", | |
404 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
405 | }, | |
406 | [RPCAUTH_mount] = { | |
407 | .name = "mount", | |
408 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
409 | }, | |
410 | [RPCAUTH_nfs] = { | |
411 | .name = "nfs", | |
412 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
413 | }, | |
414 | [RPCAUTH_portmap] = { | |
415 | .name = "portmap", | |
416 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
417 | }, | |
418 | [RPCAUTH_statd] = { | |
419 | .name = "statd", | |
420 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
421 | }, | |
422 | }; | |
423 | ||
424 | enum { | |
425 | RPCAUTH_info = 2, | |
426 | RPCAUTH_EOF | |
427 | }; | |
428 | ||
429 | static struct rpc_filelist authfiles[] = { | |
430 | [RPCAUTH_info] = { | |
431 | .name = "info", | |
432 | .i_fop = &rpc_info_operations, | |
433 | .mode = S_IFREG | S_IRUSR, | |
434 | }, | |
435 | }; | |
436 | ||
437 | static int | |
438 | rpc_get_mount(void) | |
439 | { | |
440 | return simple_pin_fs("rpc_pipefs", &rpc_mount, &rpc_mount_count); | |
441 | } | |
442 | ||
443 | static void | |
444 | rpc_put_mount(void) | |
445 | { | |
446 | simple_release_fs(&rpc_mount, &rpc_mount_count); | |
447 | } | |
448 | ||
f134585a TM |
449 | static int |
450 | rpc_lookup_parent(char *path, struct nameidata *nd) | |
451 | { | |
452 | if (path[0] == '\0') | |
453 | return -ENOENT; | |
454 | if (rpc_get_mount()) { | |
455 | printk(KERN_WARNING "%s: %s failed to mount " | |
456 | "pseudofilesystem \n", __FILE__, __FUNCTION__); | |
457 | return -ENODEV; | |
458 | } | |
459 | nd->mnt = mntget(rpc_mount); | |
460 | nd->dentry = dget(rpc_mount->mnt_root); | |
461 | nd->last_type = LAST_ROOT; | |
462 | nd->flags = LOOKUP_PARENT; | |
463 | nd->depth = 0; | |
464 | ||
465 | if (path_walk(path, nd)) { | |
466 | printk(KERN_WARNING "%s: %s failed to find path %s\n", | |
467 | __FILE__, __FUNCTION__, path); | |
468 | rpc_put_mount(); | |
469 | return -ENOENT; | |
470 | } | |
471 | return 0; | |
472 | } | |
473 | ||
474 | static void | |
475 | rpc_release_path(struct nameidata *nd) | |
476 | { | |
477 | path_release(nd); | |
478 | rpc_put_mount(); | |
479 | } | |
480 | ||
1da177e4 LT |
481 | static struct inode * |
482 | rpc_get_inode(struct super_block *sb, int mode) | |
483 | { | |
484 | struct inode *inode = new_inode(sb); | |
485 | if (!inode) | |
486 | return NULL; | |
487 | inode->i_mode = mode; | |
488 | inode->i_uid = inode->i_gid = 0; | |
489 | inode->i_blksize = PAGE_CACHE_SIZE; | |
490 | inode->i_blocks = 0; | |
491 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
492 | switch(mode & S_IFMT) { | |
493 | case S_IFDIR: | |
494 | inode->i_fop = &simple_dir_operations; | |
495 | inode->i_op = &simple_dir_inode_operations; | |
496 | inode->i_nlink++; | |
497 | default: | |
498 | break; | |
499 | } | |
500 | return inode; | |
501 | } | |
502 | ||
503 | /* | |
504 | * FIXME: This probably has races. | |
505 | */ | |
506 | static void | |
507 | rpc_depopulate(struct dentry *parent) | |
508 | { | |
509 | struct inode *dir = parent->d_inode; | |
510 | struct list_head *pos, *next; | |
511 | struct dentry *dentry, *dvec[10]; | |
512 | int n = 0; | |
513 | ||
1b1dcc1b | 514 | mutex_lock(&dir->i_mutex); |
1da177e4 LT |
515 | repeat: |
516 | spin_lock(&dcache_lock); | |
517 | list_for_each_safe(pos, next, &parent->d_subdirs) { | |
5160ee6f | 518 | dentry = list_entry(pos, struct dentry, d_u.d_child); |
1da177e4 LT |
519 | spin_lock(&dentry->d_lock); |
520 | if (!d_unhashed(dentry)) { | |
521 | dget_locked(dentry); | |
522 | __d_drop(dentry); | |
523 | spin_unlock(&dentry->d_lock); | |
524 | dvec[n++] = dentry; | |
525 | if (n == ARRAY_SIZE(dvec)) | |
526 | break; | |
527 | } else | |
528 | spin_unlock(&dentry->d_lock); | |
529 | } | |
530 | spin_unlock(&dcache_lock); | |
531 | if (n) { | |
532 | do { | |
533 | dentry = dvec[--n]; | |
534 | if (dentry->d_inode) { | |
535 | rpc_close_pipes(dentry->d_inode); | |
1da177e4 LT |
536 | simple_unlink(dir, dentry); |
537 | } | |
538 | dput(dentry); | |
539 | } while (n); | |
540 | goto repeat; | |
541 | } | |
1b1dcc1b | 542 | mutex_unlock(&dir->i_mutex); |
1da177e4 LT |
543 | } |
544 | ||
545 | static int | |
546 | rpc_populate(struct dentry *parent, | |
547 | struct rpc_filelist *files, | |
548 | int start, int eof) | |
549 | { | |
550 | struct inode *inode, *dir = parent->d_inode; | |
551 | void *private = RPC_I(dir)->private; | |
552 | struct dentry *dentry; | |
553 | int mode, i; | |
554 | ||
1b1dcc1b | 555 | mutex_lock(&dir->i_mutex); |
1da177e4 LT |
556 | for (i = start; i < eof; i++) { |
557 | dentry = d_alloc_name(parent, files[i].name); | |
558 | if (!dentry) | |
559 | goto out_bad; | |
560 | mode = files[i].mode; | |
561 | inode = rpc_get_inode(dir->i_sb, mode); | |
562 | if (!inode) { | |
563 | dput(dentry); | |
564 | goto out_bad; | |
565 | } | |
566 | inode->i_ino = i; | |
567 | if (files[i].i_fop) | |
568 | inode->i_fop = files[i].i_fop; | |
569 | if (private) | |
570 | rpc_inode_setowner(inode, private); | |
571 | if (S_ISDIR(mode)) | |
572 | dir->i_nlink++; | |
573 | d_add(dentry, inode); | |
574 | } | |
1b1dcc1b | 575 | mutex_unlock(&dir->i_mutex); |
1da177e4 LT |
576 | return 0; |
577 | out_bad: | |
1b1dcc1b | 578 | mutex_unlock(&dir->i_mutex); |
1da177e4 LT |
579 | printk(KERN_WARNING "%s: %s failed to populate directory %s\n", |
580 | __FILE__, __FUNCTION__, parent->d_name.name); | |
581 | return -ENOMEM; | |
582 | } | |
583 | ||
f134585a TM |
584 | static int |
585 | __rpc_mkdir(struct inode *dir, struct dentry *dentry) | |
1da177e4 LT |
586 | { |
587 | struct inode *inode; | |
f134585a TM |
588 | |
589 | inode = rpc_get_inode(dir->i_sb, S_IFDIR | S_IRUSR | S_IXUSR); | |
590 | if (!inode) | |
591 | goto out_err; | |
592 | inode->i_ino = iunique(dir->i_sb, 100); | |
593 | d_instantiate(dentry, inode); | |
594 | dir->i_nlink++; | |
595 | inode_dir_notify(dir, DN_CREATE); | |
596 | rpc_get_mount(); | |
597 | return 0; | |
598 | out_err: | |
599 | printk(KERN_WARNING "%s: %s failed to allocate inode for dentry %s\n", | |
600 | __FILE__, __FUNCTION__, dentry->d_name.name); | |
601 | return -ENOMEM; | |
602 | } | |
603 | ||
604 | static int | |
605 | __rpc_rmdir(struct inode *dir, struct dentry *dentry) | |
606 | { | |
1da177e4 LT |
607 | int error; |
608 | ||
f134585a | 609 | shrink_dcache_parent(dentry); |
6070fe6f | 610 | if (dentry->d_inode) |
f134585a | 611 | rpc_close_pipes(dentry->d_inode); |
f134585a TM |
612 | if ((error = simple_rmdir(dir, dentry)) != 0) |
613 | return error; | |
614 | if (!error) { | |
615 | inode_dir_notify(dir, DN_DELETE); | |
616 | d_drop(dentry); | |
617 | rpc_put_mount(); | |
618 | } | |
619 | return 0; | |
620 | } | |
1da177e4 | 621 | |
f134585a TM |
622 | static struct dentry * |
623 | rpc_lookup_negative(char *path, struct nameidata *nd) | |
624 | { | |
625 | struct dentry *dentry; | |
626 | struct inode *dir; | |
627 | int error; | |
278c995c | 628 | |
f134585a TM |
629 | if ((error = rpc_lookup_parent(path, nd)) != 0) |
630 | return ERR_PTR(error); | |
631 | dir = nd->dentry->d_inode; | |
1b1dcc1b | 632 | mutex_lock(&dir->i_mutex); |
adb12f63 | 633 | dentry = lookup_one_len(nd->last.name, nd->dentry, nd->last.len); |
1da177e4 | 634 | if (IS_ERR(dentry)) |
f134585a | 635 | goto out_err; |
1da177e4 | 636 | if (dentry->d_inode) { |
f134585a | 637 | dput(dentry); |
1da177e4 | 638 | dentry = ERR_PTR(-EEXIST); |
f134585a | 639 | goto out_err; |
1da177e4 | 640 | } |
f134585a TM |
641 | return dentry; |
642 | out_err: | |
1b1dcc1b | 643 | mutex_unlock(&dir->i_mutex); |
f134585a TM |
644 | rpc_release_path(nd); |
645 | return dentry; | |
646 | } | |
278c995c | 647 | |
1da177e4 | 648 | |
f134585a TM |
649 | struct dentry * |
650 | rpc_mkdir(char *path, struct rpc_clnt *rpc_client) | |
651 | { | |
652 | struct nameidata nd; | |
653 | struct dentry *dentry; | |
654 | struct inode *dir; | |
655 | int error; | |
656 | ||
657 | dentry = rpc_lookup_negative(path, &nd); | |
658 | if (IS_ERR(dentry)) | |
659 | return dentry; | |
660 | dir = nd.dentry->d_inode; | |
661 | if ((error = __rpc_mkdir(dir, dentry)) != 0) | |
662 | goto err_dput; | |
663 | RPC_I(dentry->d_inode)->private = rpc_client; | |
1da177e4 LT |
664 | error = rpc_populate(dentry, authfiles, |
665 | RPCAUTH_info, RPCAUTH_EOF); | |
666 | if (error) | |
f134585a TM |
667 | goto err_depopulate; |
668 | out: | |
1b1dcc1b | 669 | mutex_unlock(&dir->i_mutex); |
f134585a | 670 | rpc_release_path(&nd); |
278c995c | 671 | return dentry; |
f134585a TM |
672 | err_depopulate: |
673 | rpc_depopulate(dentry); | |
674 | __rpc_rmdir(dir, dentry); | |
675 | err_dput: | |
676 | dput(dentry); | |
677 | printk(KERN_WARNING "%s: %s() failed to create directory %s (errno = %d)\n", | |
678 | __FILE__, __FUNCTION__, path, error); | |
679 | dentry = ERR_PTR(error); | |
680 | goto out; | |
1da177e4 LT |
681 | } |
682 | ||
f134585a TM |
683 | int |
684 | rpc_rmdir(char *path) | |
1da177e4 | 685 | { |
f134585a TM |
686 | struct nameidata nd; |
687 | struct dentry *dentry; | |
688 | struct inode *dir; | |
689 | int error; | |
278c995c | 690 | |
f134585a TM |
691 | if ((error = rpc_lookup_parent(path, &nd)) != 0) |
692 | return error; | |
693 | dir = nd.dentry->d_inode; | |
1b1dcc1b | 694 | mutex_lock(&dir->i_mutex); |
adb12f63 | 695 | dentry = lookup_one_len(nd.last.name, nd.dentry, nd.last.len); |
f134585a TM |
696 | if (IS_ERR(dentry)) { |
697 | error = PTR_ERR(dentry); | |
698 | goto out_release; | |
278c995c | 699 | } |
f134585a TM |
700 | rpc_depopulate(dentry); |
701 | error = __rpc_rmdir(dir, dentry); | |
702 | dput(dentry); | |
703 | out_release: | |
1b1dcc1b | 704 | mutex_unlock(&dir->i_mutex); |
f134585a TM |
705 | rpc_release_path(&nd); |
706 | return error; | |
1da177e4 LT |
707 | } |
708 | ||
709 | struct dentry * | |
f134585a | 710 | rpc_mkpipe(char *path, void *private, struct rpc_pipe_ops *ops, int flags) |
1da177e4 | 711 | { |
f134585a | 712 | struct nameidata nd; |
1da177e4 | 713 | struct dentry *dentry; |
f134585a | 714 | struct inode *dir, *inode; |
1da177e4 LT |
715 | struct rpc_inode *rpci; |
716 | ||
f134585a | 717 | dentry = rpc_lookup_negative(path, &nd); |
1da177e4 | 718 | if (IS_ERR(dentry)) |
f134585a TM |
719 | return dentry; |
720 | dir = nd.dentry->d_inode; | |
721 | inode = rpc_get_inode(dir->i_sb, S_IFSOCK | S_IRUSR | S_IWUSR); | |
722 | if (!inode) | |
723 | goto err_dput; | |
1da177e4 LT |
724 | inode->i_ino = iunique(dir->i_sb, 100); |
725 | inode->i_fop = &rpc_pipe_fops; | |
f134585a | 726 | d_instantiate(dentry, inode); |
1da177e4 LT |
727 | rpci = RPC_I(inode); |
728 | rpci->private = private; | |
729 | rpci->flags = flags; | |
730 | rpci->ops = ops; | |
731 | inode_dir_notify(dir, DN_CREATE); | |
f134585a | 732 | out: |
1b1dcc1b | 733 | mutex_unlock(&dir->i_mutex); |
f134585a | 734 | rpc_release_path(&nd); |
1da177e4 | 735 | return dentry; |
f134585a | 736 | err_dput: |
1da177e4 | 737 | dput(dentry); |
f134585a TM |
738 | dentry = ERR_PTR(-ENOMEM); |
739 | printk(KERN_WARNING "%s: %s() failed to create pipe %s (errno = %d)\n", | |
740 | __FILE__, __FUNCTION__, path, -ENOMEM); | |
741 | goto out; | |
1da177e4 LT |
742 | } |
743 | ||
f134585a TM |
744 | int |
745 | rpc_unlink(char *path) | |
1da177e4 | 746 | { |
f134585a TM |
747 | struct nameidata nd; |
748 | struct dentry *dentry; | |
749 | struct inode *dir; | |
750 | int error; | |
1da177e4 | 751 | |
f134585a TM |
752 | if ((error = rpc_lookup_parent(path, &nd)) != 0) |
753 | return error; | |
754 | dir = nd.dentry->d_inode; | |
1b1dcc1b | 755 | mutex_lock(&dir->i_mutex); |
adb12f63 | 756 | dentry = lookup_one_len(nd.last.name, nd.dentry, nd.last.len); |
f134585a TM |
757 | if (IS_ERR(dentry)) { |
758 | error = PTR_ERR(dentry); | |
759 | goto out_release; | |
760 | } | |
761 | d_drop(dentry); | |
1da177e4 LT |
762 | if (dentry->d_inode) { |
763 | rpc_close_pipes(dentry->d_inode); | |
f134585a | 764 | error = simple_unlink(dir, dentry); |
1da177e4 | 765 | } |
f134585a TM |
766 | dput(dentry); |
767 | inode_dir_notify(dir, DN_DELETE); | |
768 | out_release: | |
1b1dcc1b | 769 | mutex_unlock(&dir->i_mutex); |
f134585a TM |
770 | rpc_release_path(&nd); |
771 | return error; | |
1da177e4 LT |
772 | } |
773 | ||
774 | /* | |
775 | * populate the filesystem | |
776 | */ | |
777 | static struct super_operations s_ops = { | |
778 | .alloc_inode = rpc_alloc_inode, | |
779 | .destroy_inode = rpc_destroy_inode, | |
780 | .statfs = simple_statfs, | |
781 | }; | |
782 | ||
783 | #define RPCAUTH_GSSMAGIC 0x67596969 | |
784 | ||
785 | static int | |
786 | rpc_fill_super(struct super_block *sb, void *data, int silent) | |
787 | { | |
788 | struct inode *inode; | |
789 | struct dentry *root; | |
790 | ||
791 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
792 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
793 | sb->s_magic = RPCAUTH_GSSMAGIC; | |
794 | sb->s_op = &s_ops; | |
795 | sb->s_time_gran = 1; | |
796 | ||
797 | inode = rpc_get_inode(sb, S_IFDIR | 0755); | |
798 | if (!inode) | |
799 | return -ENOMEM; | |
800 | root = d_alloc_root(inode); | |
801 | if (!root) { | |
802 | iput(inode); | |
803 | return -ENOMEM; | |
804 | } | |
805 | if (rpc_populate(root, files, RPCAUTH_Root + 1, RPCAUTH_RootEOF)) | |
806 | goto out; | |
807 | sb->s_root = root; | |
808 | return 0; | |
809 | out: | |
810 | d_genocide(root); | |
811 | dput(root); | |
812 | return -ENOMEM; | |
813 | } | |
814 | ||
815 | static struct super_block * | |
816 | rpc_get_sb(struct file_system_type *fs_type, | |
817 | int flags, const char *dev_name, void *data) | |
818 | { | |
819 | return get_sb_single(fs_type, flags, data, rpc_fill_super); | |
820 | } | |
821 | ||
822 | static struct file_system_type rpc_pipe_fs_type = { | |
823 | .owner = THIS_MODULE, | |
824 | .name = "rpc_pipefs", | |
825 | .get_sb = rpc_get_sb, | |
826 | .kill_sb = kill_litter_super, | |
827 | }; | |
828 | ||
829 | static void | |
830 | init_once(void * foo, kmem_cache_t * cachep, unsigned long flags) | |
831 | { | |
832 | struct rpc_inode *rpci = (struct rpc_inode *) foo; | |
833 | ||
834 | if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == | |
835 | SLAB_CTOR_CONSTRUCTOR) { | |
836 | inode_init_once(&rpci->vfs_inode); | |
837 | rpci->private = NULL; | |
838 | rpci->nreaders = 0; | |
839 | rpci->nwriters = 0; | |
840 | INIT_LIST_HEAD(&rpci->in_upcall); | |
841 | INIT_LIST_HEAD(&rpci->pipe); | |
842 | rpci->pipelen = 0; | |
843 | init_waitqueue_head(&rpci->waitq); | |
844 | INIT_WORK(&rpci->queue_timeout, rpc_timeout_upcall_queue, rpci); | |
845 | rpci->ops = NULL; | |
846 | } | |
847 | } | |
848 | ||
849 | int register_rpc_pipefs(void) | |
850 | { | |
851 | rpc_inode_cachep = kmem_cache_create("rpc_inode_cache", | |
852 | sizeof(struct rpc_inode), | |
853 | 0, SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT, | |
854 | init_once, NULL); | |
855 | if (!rpc_inode_cachep) | |
856 | return -ENOMEM; | |
857 | register_filesystem(&rpc_pipe_fs_type); | |
858 | return 0; | |
859 | } | |
860 | ||
861 | void unregister_rpc_pipefs(void) | |
862 | { | |
863 | if (kmem_cache_destroy(rpc_inode_cachep)) | |
864 | printk(KERN_WARNING "RPC: unable to free inode cache\n"); | |
865 | unregister_filesystem(&rpc_pipe_fs_type); | |
866 | } |