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 | */ | |
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)) | |
24c5d9d7 TM |
94 | queue_delayed_work(rpciod_workqueue, |
95 | &rpci->queue_timeout, | |
1da177e4 LT |
96 | RPC_UPCALL_TIMEOUT); |
97 | list_add_tail(&msg->list, &rpci->pipe); | |
98 | rpci->pipelen += msg->len; | |
6070fe6f TM |
99 | res = 0; |
100 | } | |
101 | out: | |
9842ef35 | 102 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
103 | wake_up(&rpci->waitq); |
104 | return res; | |
105 | } | |
106 | ||
6070fe6f TM |
107 | static inline void |
108 | rpc_inode_setowner(struct inode *inode, void *private) | |
109 | { | |
110 | RPC_I(inode)->private = private; | |
111 | } | |
112 | ||
1da177e4 LT |
113 | static void |
114 | rpc_close_pipes(struct inode *inode) | |
115 | { | |
116 | struct rpc_inode *rpci = RPC_I(inode); | |
9842ef35 | 117 | struct rpc_pipe_ops *ops; |
1da177e4 | 118 | |
1b1dcc1b | 119 | mutex_lock(&inode->i_mutex); |
9842ef35 TM |
120 | ops = rpci->ops; |
121 | if (ops != NULL) { | |
122 | LIST_HEAD(free_list); | |
123 | ||
124 | spin_lock(&inode->i_lock); | |
1da177e4 | 125 | rpci->nreaders = 0; |
9842ef35 TM |
126 | list_splice_init(&rpci->in_upcall, &free_list); |
127 | list_splice_init(&rpci->pipe, &free_list); | |
128 | rpci->pipelen = 0; | |
1da177e4 | 129 | rpci->ops = NULL; |
9842ef35 TM |
130 | spin_unlock(&inode->i_lock); |
131 | rpc_purge_list(rpci, &free_list, ops->destroy_msg, -EPIPE); | |
132 | rpci->nwriters = 0; | |
133 | if (ops->release_pipe) | |
134 | ops->release_pipe(inode); | |
135 | cancel_delayed_work(&rpci->queue_timeout); | |
24c5d9d7 | 136 | flush_workqueue(rpciod_workqueue); |
1da177e4 | 137 | } |
6070fe6f | 138 | rpc_inode_setowner(inode, NULL); |
1b1dcc1b | 139 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
140 | } |
141 | ||
1da177e4 LT |
142 | static struct inode * |
143 | rpc_alloc_inode(struct super_block *sb) | |
144 | { | |
145 | struct rpc_inode *rpci; | |
146 | rpci = (struct rpc_inode *)kmem_cache_alloc(rpc_inode_cachep, SLAB_KERNEL); | |
147 | if (!rpci) | |
148 | return NULL; | |
149 | return &rpci->vfs_inode; | |
150 | } | |
151 | ||
152 | static void | |
153 | rpc_destroy_inode(struct inode *inode) | |
154 | { | |
155 | kmem_cache_free(rpc_inode_cachep, RPC_I(inode)); | |
156 | } | |
157 | ||
158 | static int | |
159 | rpc_pipe_open(struct inode *inode, struct file *filp) | |
160 | { | |
161 | struct rpc_inode *rpci = RPC_I(inode); | |
162 | int res = -ENXIO; | |
163 | ||
1b1dcc1b | 164 | mutex_lock(&inode->i_mutex); |
1da177e4 LT |
165 | if (rpci->ops != NULL) { |
166 | if (filp->f_mode & FMODE_READ) | |
167 | rpci->nreaders ++; | |
168 | if (filp->f_mode & FMODE_WRITE) | |
169 | rpci->nwriters ++; | |
170 | res = 0; | |
171 | } | |
1b1dcc1b | 172 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
173 | return res; |
174 | } | |
175 | ||
176 | static int | |
177 | rpc_pipe_release(struct inode *inode, struct file *filp) | |
178 | { | |
969b7f25 | 179 | struct rpc_inode *rpci = RPC_I(inode); |
1da177e4 LT |
180 | struct rpc_pipe_msg *msg; |
181 | ||
1b1dcc1b | 182 | mutex_lock(&inode->i_mutex); |
1da177e4 LT |
183 | if (rpci->ops == NULL) |
184 | goto out; | |
185 | msg = (struct rpc_pipe_msg *)filp->private_data; | |
186 | if (msg != NULL) { | |
9842ef35 | 187 | spin_lock(&inode->i_lock); |
48e49187 | 188 | msg->errno = -EAGAIN; |
9842ef35 TM |
189 | list_del(&msg->list); |
190 | spin_unlock(&inode->i_lock); | |
1da177e4 LT |
191 | rpci->ops->destroy_msg(msg); |
192 | } | |
193 | if (filp->f_mode & FMODE_WRITE) | |
194 | rpci->nwriters --; | |
9842ef35 | 195 | if (filp->f_mode & FMODE_READ) { |
1da177e4 | 196 | rpci->nreaders --; |
9842ef35 TM |
197 | if (rpci->nreaders == 0) { |
198 | LIST_HEAD(free_list); | |
199 | spin_lock(&inode->i_lock); | |
200 | list_splice_init(&rpci->pipe, &free_list); | |
201 | rpci->pipelen = 0; | |
202 | spin_unlock(&inode->i_lock); | |
203 | rpc_purge_list(rpci, &free_list, | |
204 | rpci->ops->destroy_msg, -EAGAIN); | |
205 | } | |
206 | } | |
1da177e4 LT |
207 | if (rpci->ops->release_pipe) |
208 | rpci->ops->release_pipe(inode); | |
209 | out: | |
1b1dcc1b | 210 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
211 | return 0; |
212 | } | |
213 | ||
214 | static ssize_t | |
215 | rpc_pipe_read(struct file *filp, char __user *buf, size_t len, loff_t *offset) | |
216 | { | |
217 | struct inode *inode = filp->f_dentry->d_inode; | |
218 | struct rpc_inode *rpci = RPC_I(inode); | |
219 | struct rpc_pipe_msg *msg; | |
220 | int res = 0; | |
221 | ||
1b1dcc1b | 222 | mutex_lock(&inode->i_mutex); |
1da177e4 LT |
223 | if (rpci->ops == NULL) { |
224 | res = -EPIPE; | |
225 | goto out_unlock; | |
226 | } | |
227 | msg = filp->private_data; | |
228 | if (msg == NULL) { | |
9842ef35 | 229 | spin_lock(&inode->i_lock); |
1da177e4 LT |
230 | if (!list_empty(&rpci->pipe)) { |
231 | msg = list_entry(rpci->pipe.next, | |
232 | struct rpc_pipe_msg, | |
233 | list); | |
234 | list_move(&msg->list, &rpci->in_upcall); | |
235 | rpci->pipelen -= msg->len; | |
236 | filp->private_data = msg; | |
237 | msg->copied = 0; | |
238 | } | |
9842ef35 | 239 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
240 | if (msg == NULL) |
241 | goto out_unlock; | |
242 | } | |
243 | /* NOTE: it is up to the callback to update msg->copied */ | |
244 | res = rpci->ops->upcall(filp, msg, buf, len); | |
245 | if (res < 0 || msg->len == msg->copied) { | |
246 | filp->private_data = NULL; | |
9842ef35 TM |
247 | spin_lock(&inode->i_lock); |
248 | list_del(&msg->list); | |
249 | spin_unlock(&inode->i_lock); | |
1da177e4 LT |
250 | rpci->ops->destroy_msg(msg); |
251 | } | |
252 | out_unlock: | |
1b1dcc1b | 253 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
254 | return res; |
255 | } | |
256 | ||
257 | static ssize_t | |
258 | rpc_pipe_write(struct file *filp, const char __user *buf, size_t len, loff_t *offset) | |
259 | { | |
260 | struct inode *inode = filp->f_dentry->d_inode; | |
261 | struct rpc_inode *rpci = RPC_I(inode); | |
262 | int res; | |
263 | ||
1b1dcc1b | 264 | mutex_lock(&inode->i_mutex); |
1da177e4 LT |
265 | res = -EPIPE; |
266 | if (rpci->ops != NULL) | |
267 | res = rpci->ops->downcall(filp, buf, len); | |
1b1dcc1b | 268 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
269 | return res; |
270 | } | |
271 | ||
272 | static unsigned int | |
273 | rpc_pipe_poll(struct file *filp, struct poll_table_struct *wait) | |
274 | { | |
275 | struct rpc_inode *rpci; | |
276 | unsigned int mask = 0; | |
277 | ||
278 | rpci = RPC_I(filp->f_dentry->d_inode); | |
279 | poll_wait(filp, &rpci->waitq, wait); | |
280 | ||
281 | mask = POLLOUT | POLLWRNORM; | |
282 | if (rpci->ops == NULL) | |
283 | mask |= POLLERR | POLLHUP; | |
284 | if (!list_empty(&rpci->pipe)) | |
285 | mask |= POLLIN | POLLRDNORM; | |
286 | return mask; | |
287 | } | |
288 | ||
289 | static int | |
290 | rpc_pipe_ioctl(struct inode *ino, struct file *filp, | |
291 | unsigned int cmd, unsigned long arg) | |
292 | { | |
293 | struct rpc_inode *rpci = RPC_I(filp->f_dentry->d_inode); | |
294 | int len; | |
295 | ||
296 | switch (cmd) { | |
297 | case FIONREAD: | |
298 | if (rpci->ops == NULL) | |
299 | return -EPIPE; | |
300 | len = rpci->pipelen; | |
301 | if (filp->private_data) { | |
302 | struct rpc_pipe_msg *msg; | |
303 | msg = (struct rpc_pipe_msg *)filp->private_data; | |
304 | len += msg->len - msg->copied; | |
305 | } | |
306 | return put_user(len, (int __user *)arg); | |
307 | default: | |
308 | return -EINVAL; | |
309 | } | |
310 | } | |
311 | ||
312 | static struct file_operations rpc_pipe_fops = { | |
313 | .owner = THIS_MODULE, | |
314 | .llseek = no_llseek, | |
315 | .read = rpc_pipe_read, | |
316 | .write = rpc_pipe_write, | |
317 | .poll = rpc_pipe_poll, | |
318 | .ioctl = rpc_pipe_ioctl, | |
319 | .open = rpc_pipe_open, | |
320 | .release = rpc_pipe_release, | |
321 | }; | |
322 | ||
323 | static int | |
324 | rpc_show_info(struct seq_file *m, void *v) | |
325 | { | |
326 | struct rpc_clnt *clnt = m->private; | |
327 | ||
328 | seq_printf(m, "RPC server: %s\n", clnt->cl_server); | |
329 | seq_printf(m, "service: %s (%d) version %d\n", clnt->cl_protname, | |
330 | clnt->cl_prog, clnt->cl_vers); | |
331 | seq_printf(m, "address: %u.%u.%u.%u\n", | |
332 | NIPQUAD(clnt->cl_xprt->addr.sin_addr.s_addr)); | |
333 | seq_printf(m, "protocol: %s\n", | |
334 | clnt->cl_xprt->prot == IPPROTO_UDP ? "udp" : "tcp"); | |
335 | return 0; | |
336 | } | |
337 | ||
338 | static int | |
339 | rpc_info_open(struct inode *inode, struct file *file) | |
340 | { | |
341 | struct rpc_clnt *clnt; | |
342 | int ret = single_open(file, rpc_show_info, NULL); | |
343 | ||
344 | if (!ret) { | |
345 | struct seq_file *m = file->private_data; | |
1b1dcc1b | 346 | mutex_lock(&inode->i_mutex); |
1da177e4 LT |
347 | clnt = RPC_I(inode)->private; |
348 | if (clnt) { | |
349 | atomic_inc(&clnt->cl_users); | |
350 | m->private = clnt; | |
351 | } else { | |
352 | single_release(inode, file); | |
353 | ret = -EINVAL; | |
354 | } | |
1b1dcc1b | 355 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
356 | } |
357 | return ret; | |
358 | } | |
359 | ||
360 | static int | |
361 | rpc_info_release(struct inode *inode, struct file *file) | |
362 | { | |
363 | struct seq_file *m = file->private_data; | |
364 | struct rpc_clnt *clnt = (struct rpc_clnt *)m->private; | |
365 | ||
366 | if (clnt) | |
367 | rpc_release_client(clnt); | |
368 | return single_release(inode, file); | |
369 | } | |
370 | ||
371 | static struct file_operations rpc_info_operations = { | |
372 | .owner = THIS_MODULE, | |
373 | .open = rpc_info_open, | |
374 | .read = seq_read, | |
375 | .llseek = seq_lseek, | |
376 | .release = rpc_info_release, | |
377 | }; | |
378 | ||
379 | ||
380 | /* | |
381 | * We have a single directory with 1 node in it. | |
382 | */ | |
383 | enum { | |
384 | RPCAUTH_Root = 1, | |
385 | RPCAUTH_lockd, | |
386 | RPCAUTH_mount, | |
387 | RPCAUTH_nfs, | |
388 | RPCAUTH_portmap, | |
389 | RPCAUTH_statd, | |
390 | RPCAUTH_RootEOF | |
391 | }; | |
392 | ||
393 | /* | |
394 | * Description of fs contents. | |
395 | */ | |
396 | struct rpc_filelist { | |
397 | char *name; | |
99ac48f5 | 398 | const struct file_operations *i_fop; |
1da177e4 LT |
399 | int mode; |
400 | }; | |
401 | ||
402 | static struct rpc_filelist files[] = { | |
403 | [RPCAUTH_lockd] = { | |
404 | .name = "lockd", | |
405 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
406 | }, | |
407 | [RPCAUTH_mount] = { | |
408 | .name = "mount", | |
409 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
410 | }, | |
411 | [RPCAUTH_nfs] = { | |
412 | .name = "nfs", | |
413 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
414 | }, | |
415 | [RPCAUTH_portmap] = { | |
416 | .name = "portmap", | |
417 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
418 | }, | |
419 | [RPCAUTH_statd] = { | |
420 | .name = "statd", | |
421 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
422 | }, | |
423 | }; | |
424 | ||
425 | enum { | |
426 | RPCAUTH_info = 2, | |
427 | RPCAUTH_EOF | |
428 | }; | |
429 | ||
430 | static struct rpc_filelist authfiles[] = { | |
431 | [RPCAUTH_info] = { | |
432 | .name = "info", | |
433 | .i_fop = &rpc_info_operations, | |
434 | .mode = S_IFREG | S_IRUSR, | |
435 | }, | |
436 | }; | |
437 | ||
54281548 | 438 | struct vfsmount *rpc_get_mount(void) |
1da177e4 | 439 | { |
54281548 TM |
440 | int err; |
441 | ||
442 | err = simple_pin_fs("rpc_pipefs", &rpc_mount, &rpc_mount_count); | |
443 | if (err != 0) | |
444 | return ERR_PTR(err); | |
445 | return rpc_mount; | |
1da177e4 LT |
446 | } |
447 | ||
54281548 | 448 | void rpc_put_mount(void) |
1da177e4 LT |
449 | { |
450 | simple_release_fs(&rpc_mount, &rpc_mount_count); | |
451 | } | |
452 | ||
f134585a TM |
453 | static int |
454 | rpc_lookup_parent(char *path, struct nameidata *nd) | |
455 | { | |
456 | if (path[0] == '\0') | |
457 | return -ENOENT; | |
54281548 TM |
458 | nd->mnt = rpc_get_mount(); |
459 | if (IS_ERR(nd->mnt)) { | |
f134585a TM |
460 | printk(KERN_WARNING "%s: %s failed to mount " |
461 | "pseudofilesystem \n", __FILE__, __FUNCTION__); | |
54281548 | 462 | return PTR_ERR(nd->mnt); |
f134585a | 463 | } |
54281548 | 464 | mntget(nd->mnt); |
f134585a TM |
465 | nd->dentry = dget(rpc_mount->mnt_root); |
466 | nd->last_type = LAST_ROOT; | |
467 | nd->flags = LOOKUP_PARENT; | |
468 | nd->depth = 0; | |
469 | ||
470 | if (path_walk(path, nd)) { | |
471 | printk(KERN_WARNING "%s: %s failed to find path %s\n", | |
472 | __FILE__, __FUNCTION__, path); | |
473 | rpc_put_mount(); | |
474 | return -ENOENT; | |
475 | } | |
476 | return 0; | |
477 | } | |
478 | ||
479 | static void | |
480 | rpc_release_path(struct nameidata *nd) | |
481 | { | |
482 | path_release(nd); | |
483 | rpc_put_mount(); | |
484 | } | |
485 | ||
1da177e4 LT |
486 | static struct inode * |
487 | rpc_get_inode(struct super_block *sb, int mode) | |
488 | { | |
489 | struct inode *inode = new_inode(sb); | |
490 | if (!inode) | |
491 | return NULL; | |
492 | inode->i_mode = mode; | |
493 | inode->i_uid = inode->i_gid = 0; | |
494 | inode->i_blksize = PAGE_CACHE_SIZE; | |
495 | inode->i_blocks = 0; | |
496 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
497 | switch(mode & S_IFMT) { | |
498 | case S_IFDIR: | |
499 | inode->i_fop = &simple_dir_operations; | |
500 | inode->i_op = &simple_dir_inode_operations; | |
501 | inode->i_nlink++; | |
502 | default: | |
503 | break; | |
504 | } | |
505 | return inode; | |
506 | } | |
507 | ||
508 | /* | |
509 | * FIXME: This probably has races. | |
510 | */ | |
511 | static void | |
512 | rpc_depopulate(struct dentry *parent) | |
513 | { | |
514 | struct inode *dir = parent->d_inode; | |
515 | struct list_head *pos, *next; | |
516 | struct dentry *dentry, *dvec[10]; | |
517 | int n = 0; | |
518 | ||
1b1dcc1b | 519 | mutex_lock(&dir->i_mutex); |
1da177e4 LT |
520 | repeat: |
521 | spin_lock(&dcache_lock); | |
522 | list_for_each_safe(pos, next, &parent->d_subdirs) { | |
5160ee6f | 523 | dentry = list_entry(pos, struct dentry, d_u.d_child); |
1da177e4 LT |
524 | spin_lock(&dentry->d_lock); |
525 | if (!d_unhashed(dentry)) { | |
526 | dget_locked(dentry); | |
527 | __d_drop(dentry); | |
528 | spin_unlock(&dentry->d_lock); | |
529 | dvec[n++] = dentry; | |
530 | if (n == ARRAY_SIZE(dvec)) | |
531 | break; | |
532 | } else | |
533 | spin_unlock(&dentry->d_lock); | |
534 | } | |
535 | spin_unlock(&dcache_lock); | |
536 | if (n) { | |
537 | do { | |
538 | dentry = dvec[--n]; | |
539 | if (dentry->d_inode) { | |
540 | rpc_close_pipes(dentry->d_inode); | |
1da177e4 LT |
541 | simple_unlink(dir, dentry); |
542 | } | |
543 | dput(dentry); | |
544 | } while (n); | |
545 | goto repeat; | |
546 | } | |
1b1dcc1b | 547 | mutex_unlock(&dir->i_mutex); |
1da177e4 LT |
548 | } |
549 | ||
550 | static int | |
551 | rpc_populate(struct dentry *parent, | |
552 | struct rpc_filelist *files, | |
553 | int start, int eof) | |
554 | { | |
555 | struct inode *inode, *dir = parent->d_inode; | |
556 | void *private = RPC_I(dir)->private; | |
557 | struct dentry *dentry; | |
558 | int mode, i; | |
559 | ||
1b1dcc1b | 560 | mutex_lock(&dir->i_mutex); |
1da177e4 LT |
561 | for (i = start; i < eof; i++) { |
562 | dentry = d_alloc_name(parent, files[i].name); | |
563 | if (!dentry) | |
564 | goto out_bad; | |
565 | mode = files[i].mode; | |
566 | inode = rpc_get_inode(dir->i_sb, mode); | |
567 | if (!inode) { | |
568 | dput(dentry); | |
569 | goto out_bad; | |
570 | } | |
571 | inode->i_ino = i; | |
572 | if (files[i].i_fop) | |
573 | inode->i_fop = files[i].i_fop; | |
574 | if (private) | |
575 | rpc_inode_setowner(inode, private); | |
576 | if (S_ISDIR(mode)) | |
577 | dir->i_nlink++; | |
578 | d_add(dentry, inode); | |
579 | } | |
1b1dcc1b | 580 | mutex_unlock(&dir->i_mutex); |
1da177e4 LT |
581 | return 0; |
582 | out_bad: | |
1b1dcc1b | 583 | mutex_unlock(&dir->i_mutex); |
1da177e4 LT |
584 | printk(KERN_WARNING "%s: %s failed to populate directory %s\n", |
585 | __FILE__, __FUNCTION__, parent->d_name.name); | |
586 | return -ENOMEM; | |
587 | } | |
588 | ||
f134585a TM |
589 | static int |
590 | __rpc_mkdir(struct inode *dir, struct dentry *dentry) | |
1da177e4 LT |
591 | { |
592 | struct inode *inode; | |
f134585a TM |
593 | |
594 | inode = rpc_get_inode(dir->i_sb, S_IFDIR | S_IRUSR | S_IXUSR); | |
595 | if (!inode) | |
596 | goto out_err; | |
597 | inode->i_ino = iunique(dir->i_sb, 100); | |
598 | d_instantiate(dentry, inode); | |
599 | dir->i_nlink++; | |
600 | inode_dir_notify(dir, DN_CREATE); | |
f134585a TM |
601 | return 0; |
602 | out_err: | |
603 | printk(KERN_WARNING "%s: %s failed to allocate inode for dentry %s\n", | |
604 | __FILE__, __FUNCTION__, dentry->d_name.name); | |
605 | return -ENOMEM; | |
606 | } | |
607 | ||
608 | static int | |
609 | __rpc_rmdir(struct inode *dir, struct dentry *dentry) | |
610 | { | |
1da177e4 LT |
611 | int error; |
612 | ||
f134585a | 613 | shrink_dcache_parent(dentry); |
6070fe6f | 614 | if (dentry->d_inode) |
f134585a | 615 | rpc_close_pipes(dentry->d_inode); |
f134585a TM |
616 | if ((error = simple_rmdir(dir, dentry)) != 0) |
617 | return error; | |
618 | if (!error) { | |
619 | inode_dir_notify(dir, DN_DELETE); | |
620 | d_drop(dentry); | |
f134585a TM |
621 | } |
622 | return 0; | |
623 | } | |
1da177e4 | 624 | |
f134585a TM |
625 | static struct dentry * |
626 | rpc_lookup_negative(char *path, struct nameidata *nd) | |
627 | { | |
628 | struct dentry *dentry; | |
629 | struct inode *dir; | |
630 | int error; | |
278c995c | 631 | |
f134585a TM |
632 | if ((error = rpc_lookup_parent(path, nd)) != 0) |
633 | return ERR_PTR(error); | |
634 | dir = nd->dentry->d_inode; | |
1b1dcc1b | 635 | mutex_lock(&dir->i_mutex); |
adb12f63 | 636 | dentry = lookup_one_len(nd->last.name, nd->dentry, nd->last.len); |
1da177e4 | 637 | if (IS_ERR(dentry)) |
f134585a | 638 | goto out_err; |
1da177e4 | 639 | if (dentry->d_inode) { |
f134585a | 640 | dput(dentry); |
1da177e4 | 641 | dentry = ERR_PTR(-EEXIST); |
f134585a | 642 | goto out_err; |
1da177e4 | 643 | } |
f134585a TM |
644 | return dentry; |
645 | out_err: | |
1b1dcc1b | 646 | mutex_unlock(&dir->i_mutex); |
f134585a TM |
647 | rpc_release_path(nd); |
648 | return dentry; | |
649 | } | |
278c995c | 650 | |
1da177e4 | 651 | |
f134585a TM |
652 | struct dentry * |
653 | rpc_mkdir(char *path, struct rpc_clnt *rpc_client) | |
654 | { | |
655 | struct nameidata nd; | |
656 | struct dentry *dentry; | |
657 | struct inode *dir; | |
658 | int error; | |
659 | ||
660 | dentry = rpc_lookup_negative(path, &nd); | |
661 | if (IS_ERR(dentry)) | |
662 | return dentry; | |
663 | dir = nd.dentry->d_inode; | |
664 | if ((error = __rpc_mkdir(dir, dentry)) != 0) | |
665 | goto err_dput; | |
666 | RPC_I(dentry->d_inode)->private = rpc_client; | |
1da177e4 LT |
667 | error = rpc_populate(dentry, authfiles, |
668 | RPCAUTH_info, RPCAUTH_EOF); | |
669 | if (error) | |
f134585a TM |
670 | goto err_depopulate; |
671 | out: | |
1b1dcc1b | 672 | mutex_unlock(&dir->i_mutex); |
f134585a | 673 | rpc_release_path(&nd); |
12de3b35 | 674 | return dget(dentry); |
f134585a TM |
675 | err_depopulate: |
676 | rpc_depopulate(dentry); | |
677 | __rpc_rmdir(dir, dentry); | |
678 | err_dput: | |
679 | dput(dentry); | |
680 | printk(KERN_WARNING "%s: %s() failed to create directory %s (errno = %d)\n", | |
681 | __FILE__, __FUNCTION__, path, error); | |
682 | dentry = ERR_PTR(error); | |
683 | goto out; | |
1da177e4 LT |
684 | } |
685 | ||
f134585a TM |
686 | int |
687 | rpc_rmdir(char *path) | |
1da177e4 | 688 | { |
f134585a TM |
689 | struct nameidata nd; |
690 | struct dentry *dentry; | |
691 | struct inode *dir; | |
692 | int error; | |
278c995c | 693 | |
f134585a TM |
694 | if ((error = rpc_lookup_parent(path, &nd)) != 0) |
695 | return error; | |
696 | dir = nd.dentry->d_inode; | |
1b1dcc1b | 697 | mutex_lock(&dir->i_mutex); |
adb12f63 | 698 | dentry = lookup_one_len(nd.last.name, nd.dentry, nd.last.len); |
f134585a TM |
699 | if (IS_ERR(dentry)) { |
700 | error = PTR_ERR(dentry); | |
701 | goto out_release; | |
278c995c | 702 | } |
f134585a TM |
703 | rpc_depopulate(dentry); |
704 | error = __rpc_rmdir(dir, dentry); | |
705 | dput(dentry); | |
706 | out_release: | |
1b1dcc1b | 707 | mutex_unlock(&dir->i_mutex); |
f134585a TM |
708 | rpc_release_path(&nd); |
709 | return error; | |
1da177e4 LT |
710 | } |
711 | ||
712 | struct dentry * | |
f134585a | 713 | rpc_mkpipe(char *path, void *private, struct rpc_pipe_ops *ops, int flags) |
1da177e4 | 714 | { |
f134585a | 715 | struct nameidata nd; |
1da177e4 | 716 | struct dentry *dentry; |
f134585a | 717 | struct inode *dir, *inode; |
1da177e4 LT |
718 | struct rpc_inode *rpci; |
719 | ||
f134585a | 720 | dentry = rpc_lookup_negative(path, &nd); |
1da177e4 | 721 | if (IS_ERR(dentry)) |
f134585a TM |
722 | return dentry; |
723 | dir = nd.dentry->d_inode; | |
724 | inode = rpc_get_inode(dir->i_sb, S_IFSOCK | S_IRUSR | S_IWUSR); | |
725 | if (!inode) | |
726 | goto err_dput; | |
1da177e4 LT |
727 | inode->i_ino = iunique(dir->i_sb, 100); |
728 | inode->i_fop = &rpc_pipe_fops; | |
f134585a | 729 | d_instantiate(dentry, inode); |
1da177e4 LT |
730 | rpci = RPC_I(inode); |
731 | rpci->private = private; | |
732 | rpci->flags = flags; | |
733 | rpci->ops = ops; | |
734 | inode_dir_notify(dir, DN_CREATE); | |
f134585a | 735 | out: |
1b1dcc1b | 736 | mutex_unlock(&dir->i_mutex); |
f134585a | 737 | rpc_release_path(&nd); |
12de3b35 | 738 | return dget(dentry); |
f134585a | 739 | err_dput: |
1da177e4 | 740 | dput(dentry); |
f134585a TM |
741 | dentry = ERR_PTR(-ENOMEM); |
742 | printk(KERN_WARNING "%s: %s() failed to create pipe %s (errno = %d)\n", | |
743 | __FILE__, __FUNCTION__, path, -ENOMEM); | |
744 | goto out; | |
1da177e4 LT |
745 | } |
746 | ||
f134585a TM |
747 | int |
748 | rpc_unlink(char *path) | |
1da177e4 | 749 | { |
f134585a TM |
750 | struct nameidata nd; |
751 | struct dentry *dentry; | |
752 | struct inode *dir; | |
753 | int error; | |
1da177e4 | 754 | |
f134585a TM |
755 | if ((error = rpc_lookup_parent(path, &nd)) != 0) |
756 | return error; | |
757 | dir = nd.dentry->d_inode; | |
1b1dcc1b | 758 | mutex_lock(&dir->i_mutex); |
adb12f63 | 759 | dentry = lookup_one_len(nd.last.name, nd.dentry, nd.last.len); |
f134585a TM |
760 | if (IS_ERR(dentry)) { |
761 | error = PTR_ERR(dentry); | |
762 | goto out_release; | |
763 | } | |
764 | d_drop(dentry); | |
1da177e4 LT |
765 | if (dentry->d_inode) { |
766 | rpc_close_pipes(dentry->d_inode); | |
f134585a | 767 | error = simple_unlink(dir, dentry); |
1da177e4 | 768 | } |
f134585a TM |
769 | dput(dentry); |
770 | inode_dir_notify(dir, DN_DELETE); | |
771 | out_release: | |
1b1dcc1b | 772 | mutex_unlock(&dir->i_mutex); |
f134585a TM |
773 | rpc_release_path(&nd); |
774 | return error; | |
1da177e4 LT |
775 | } |
776 | ||
777 | /* | |
778 | * populate the filesystem | |
779 | */ | |
780 | static struct super_operations s_ops = { | |
781 | .alloc_inode = rpc_alloc_inode, | |
782 | .destroy_inode = rpc_destroy_inode, | |
783 | .statfs = simple_statfs, | |
784 | }; | |
785 | ||
786 | #define RPCAUTH_GSSMAGIC 0x67596969 | |
787 | ||
788 | static int | |
789 | rpc_fill_super(struct super_block *sb, void *data, int silent) | |
790 | { | |
791 | struct inode *inode; | |
792 | struct dentry *root; | |
793 | ||
794 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
795 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
796 | sb->s_magic = RPCAUTH_GSSMAGIC; | |
797 | sb->s_op = &s_ops; | |
798 | sb->s_time_gran = 1; | |
799 | ||
800 | inode = rpc_get_inode(sb, S_IFDIR | 0755); | |
801 | if (!inode) | |
802 | return -ENOMEM; | |
803 | root = d_alloc_root(inode); | |
804 | if (!root) { | |
805 | iput(inode); | |
806 | return -ENOMEM; | |
807 | } | |
808 | if (rpc_populate(root, files, RPCAUTH_Root + 1, RPCAUTH_RootEOF)) | |
809 | goto out; | |
810 | sb->s_root = root; | |
811 | return 0; | |
812 | out: | |
813 | d_genocide(root); | |
814 | dput(root); | |
815 | return -ENOMEM; | |
816 | } | |
817 | ||
818 | static struct super_block * | |
819 | rpc_get_sb(struct file_system_type *fs_type, | |
820 | int flags, const char *dev_name, void *data) | |
821 | { | |
822 | return get_sb_single(fs_type, flags, data, rpc_fill_super); | |
823 | } | |
824 | ||
825 | static struct file_system_type rpc_pipe_fs_type = { | |
826 | .owner = THIS_MODULE, | |
827 | .name = "rpc_pipefs", | |
828 | .get_sb = rpc_get_sb, | |
829 | .kill_sb = kill_litter_super, | |
830 | }; | |
831 | ||
832 | static void | |
833 | init_once(void * foo, kmem_cache_t * cachep, unsigned long flags) | |
834 | { | |
835 | struct rpc_inode *rpci = (struct rpc_inode *) foo; | |
836 | ||
837 | if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == | |
838 | SLAB_CTOR_CONSTRUCTOR) { | |
839 | inode_init_once(&rpci->vfs_inode); | |
840 | rpci->private = NULL; | |
841 | rpci->nreaders = 0; | |
842 | rpci->nwriters = 0; | |
843 | INIT_LIST_HEAD(&rpci->in_upcall); | |
844 | INIT_LIST_HEAD(&rpci->pipe); | |
845 | rpci->pipelen = 0; | |
846 | init_waitqueue_head(&rpci->waitq); | |
847 | INIT_WORK(&rpci->queue_timeout, rpc_timeout_upcall_queue, rpci); | |
848 | rpci->ops = NULL; | |
849 | } | |
850 | } | |
851 | ||
852 | int register_rpc_pipefs(void) | |
853 | { | |
854 | rpc_inode_cachep = kmem_cache_create("rpc_inode_cache", | |
fffb60f9 PJ |
855 | sizeof(struct rpc_inode), |
856 | 0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| | |
857 | SLAB_MEM_SPREAD), | |
858 | init_once, NULL); | |
1da177e4 LT |
859 | if (!rpc_inode_cachep) |
860 | return -ENOMEM; | |
861 | register_filesystem(&rpc_pipe_fs_type); | |
862 | return 0; | |
863 | } | |
864 | ||
865 | void unregister_rpc_pipefs(void) | |
866 | { | |
867 | if (kmem_cache_destroy(rpc_inode_cachep)) | |
868 | printk(KERN_WARNING "RPC: unable to free inode cache\n"); | |
869 | unregister_filesystem(&rpc_pipe_fs_type); | |
870 | } |