blob: 9ced0628d69c35d44aa158b6d615acf8086278c6 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * net/sunrpc/rpc_pipe.c
3 *
4 * Userland/kernel interface for rpcauth_gss.
5 * Code shamelessly plagiarized from fs/nfsd/nfsctl.c
Rolf Eike Beerd51fe1b2005-09-02 08:59:25 +02006 * and fs/sysfs/inode.c
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 *
8 * Copyright (c) 2002, Trond Myklebust <trond.myklebust@fys.uio.no>
9 *
10 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070011#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>
Trond Myklebust50e437d2007-06-07 22:44:34 -040017#include <linux/fsnotify.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#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>
29
Eric Dumazetba899662005-08-26 12:05:31 -070030static struct vfsmount *rpc_mount __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -070031static int rpc_mount_count;
32
33static struct file_system_type rpc_pipe_fs_type;
34
35
Christoph Lametere18b8902006-12-06 20:33:20 -080036static struct kmem_cache *rpc_inode_cachep __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -070037
38#define RPC_UPCALL_TIMEOUT (30*HZ)
39
Trond Myklebust9842ef32006-02-01 12:18:44 -050040static void rpc_purge_list(struct rpc_inode *rpci, struct list_head *head,
41 void (*destroy_msg)(struct rpc_pipe_msg *), int err)
Trond Myklebustb3eb67a2005-11-25 17:10:11 -050042{
43 struct rpc_pipe_msg *msg;
Trond Myklebustb3eb67a2005-11-25 17:10:11 -050044
Trond Myklebust9842ef32006-02-01 12:18:44 -050045 if (list_empty(head))
46 return;
47 do {
Trond Myklebustb3eb67a2005-11-25 17:10:11 -050048 msg = list_entry(head->next, struct rpc_pipe_msg, list);
Trond Myklebust9842ef32006-02-01 12:18:44 -050049 list_del(&msg->list);
Trond Myklebustb3eb67a2005-11-25 17:10:11 -050050 msg->errno = err;
51 destroy_msg(msg);
Trond Myklebust9842ef32006-02-01 12:18:44 -050052 } while (!list_empty(head));
Linus Torvalds1da177e2005-04-16 15:20:36 -070053 wake_up(&rpci->waitq);
54}
55
56static void
David Howells65f27f32006-11-22 14:55:48 +000057rpc_timeout_upcall_queue(struct work_struct *work)
Linus Torvalds1da177e2005-04-16 15:20:36 -070058{
Trond Myklebust9842ef32006-02-01 12:18:44 -050059 LIST_HEAD(free_list);
David Howells65f27f32006-11-22 14:55:48 +000060 struct rpc_inode *rpci =
61 container_of(work, struct rpc_inode, queue_timeout.work);
Linus Torvalds1da177e2005-04-16 15:20:36 -070062 struct inode *inode = &rpci->vfs_inode;
Trond Myklebust9842ef32006-02-01 12:18:44 -050063 void (*destroy_msg)(struct rpc_pipe_msg *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070064
Trond Myklebust9842ef32006-02-01 12:18:44 -050065 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -070077}
78
J. Bruce Fields93a44a72007-11-06 13:06:03 -050079/**
80 * rpc_queue_upcall
81 * @inode: inode of upcall pipe on which to queue given message
82 * @msg: message to queue
83 *
84 * Call with an @inode created by rpc_mkpipe() to queue an upcall.
85 * A userspace process may then later read the upcall by performing a
86 * read on an open file for this inode. It is up to the caller to
87 * initialize the fields of @msg (other than @msg->list) appropriately.
88 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070089int
90rpc_queue_upcall(struct inode *inode, struct rpc_pipe_msg *msg)
91{
92 struct rpc_inode *rpci = RPC_I(inode);
Trond Myklebust6070fe62005-10-27 22:12:46 -040093 int res = -EPIPE;
Linus Torvalds1da177e2005-04-16 15:20:36 -070094
Trond Myklebust9842ef32006-02-01 12:18:44 -050095 spin_lock(&inode->i_lock);
Trond Myklebust6070fe62005-10-27 22:12:46 -040096 if (rpci->ops == NULL)
97 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 if (rpci->nreaders) {
99 list_add_tail(&msg->list, &rpci->pipe);
100 rpci->pipelen += msg->len;
Trond Myklebust6070fe62005-10-27 22:12:46 -0400101 res = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102 } else if (rpci->flags & RPC_PIPE_WAIT_FOR_OPEN) {
103 if (list_empty(&rpci->pipe))
Trond Myklebust24c5d9d2006-03-20 13:44:08 -0500104 queue_delayed_work(rpciod_workqueue,
105 &rpci->queue_timeout,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106 RPC_UPCALL_TIMEOUT);
107 list_add_tail(&msg->list, &rpci->pipe);
108 rpci->pipelen += msg->len;
Trond Myklebust6070fe62005-10-27 22:12:46 -0400109 res = 0;
110 }
111out:
Trond Myklebust9842ef32006-02-01 12:18:44 -0500112 spin_unlock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 wake_up(&rpci->waitq);
114 return res;
115}
Trond Myklebust468039e2008-12-23 15:21:31 -0500116EXPORT_SYMBOL_GPL(rpc_queue_upcall);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117
Trond Myklebust6070fe62005-10-27 22:12:46 -0400118static inline void
119rpc_inode_setowner(struct inode *inode, void *private)
120{
121 RPC_I(inode)->private = private;
122}
123
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124static void
125rpc_close_pipes(struct inode *inode)
126{
127 struct rpc_inode *rpci = RPC_I(inode);
Trond Myklebust9842ef32006-02-01 12:18:44 -0500128 struct rpc_pipe_ops *ops;
\"J. Bruce Fields\e7128042008-12-23 16:09:47 -0500129 int need_release;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800131 mutex_lock(&inode->i_mutex);
Trond Myklebust9842ef32006-02-01 12:18:44 -0500132 ops = rpci->ops;
133 if (ops != NULL) {
134 LIST_HEAD(free_list);
Trond Myklebust9842ef32006-02-01 12:18:44 -0500135 spin_lock(&inode->i_lock);
\"J. Bruce Fields\e7128042008-12-23 16:09:47 -0500136 need_release = rpci->nreaders != 0 || rpci->nwriters != 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 rpci->nreaders = 0;
Trond Myklebust9842ef32006-02-01 12:18:44 -0500138 list_splice_init(&rpci->in_upcall, &free_list);
139 list_splice_init(&rpci->pipe, &free_list);
140 rpci->pipelen = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141 rpci->ops = NULL;
Trond Myklebust9842ef32006-02-01 12:18:44 -0500142 spin_unlock(&inode->i_lock);
143 rpc_purge_list(rpci, &free_list, ops->destroy_msg, -EPIPE);
144 rpci->nwriters = 0;
\"J. Bruce Fields\e7128042008-12-23 16:09:47 -0500145 if (need_release && ops->release_pipe)
Trond Myklebust9842ef32006-02-01 12:18:44 -0500146 ops->release_pipe(inode);
Trond Myklebust4011cd92007-08-07 15:33:01 -0400147 cancel_delayed_work_sync(&rpci->queue_timeout);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 }
Trond Myklebust6070fe62005-10-27 22:12:46 -0400149 rpc_inode_setowner(inode, NULL);
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800150 mutex_unlock(&inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151}
152
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153static struct inode *
154rpc_alloc_inode(struct super_block *sb)
155{
156 struct rpc_inode *rpci;
Christoph Lametere94b1762006-12-06 20:33:17 -0800157 rpci = (struct rpc_inode *)kmem_cache_alloc(rpc_inode_cachep, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 if (!rpci)
159 return NULL;
160 return &rpci->vfs_inode;
161}
162
163static void
164rpc_destroy_inode(struct inode *inode)
165{
166 kmem_cache_free(rpc_inode_cachep, RPC_I(inode));
167}
168
169static int
170rpc_pipe_open(struct inode *inode, struct file *filp)
171{
172 struct rpc_inode *rpci = RPC_I(inode);
\"J. Bruce Fields\c3810602008-12-23 16:08:32 -0500173 int first_open;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 int res = -ENXIO;
175
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800176 mutex_lock(&inode->i_mutex);
\"J. Bruce Fields\c3810602008-12-23 16:08:32 -0500177 if (rpci->ops == NULL)
178 goto out;
179 first_open = rpci->nreaders == 0 && rpci->nwriters == 0;
180 if (first_open && rpci->ops->open_pipe) {
181 res = rpci->ops->open_pipe(inode);
182 if (res)
183 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 }
\"J. Bruce Fields\c3810602008-12-23 16:08:32 -0500185 if (filp->f_mode & FMODE_READ)
186 rpci->nreaders++;
187 if (filp->f_mode & FMODE_WRITE)
188 rpci->nwriters++;
189 res = 0;
190out:
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800191 mutex_unlock(&inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 return res;
193}
194
195static int
196rpc_pipe_release(struct inode *inode, struct file *filp)
197{
Trond Myklebust969b7f22006-01-03 09:55:36 +0100198 struct rpc_inode *rpci = RPC_I(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 struct rpc_pipe_msg *msg;
\"J. Bruce Fields\e7128042008-12-23 16:09:47 -0500200 int last_close;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800202 mutex_lock(&inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 if (rpci->ops == NULL)
204 goto out;
205 msg = (struct rpc_pipe_msg *)filp->private_data;
206 if (msg != NULL) {
Trond Myklebust9842ef32006-02-01 12:18:44 -0500207 spin_lock(&inode->i_lock);
Trond Myklebust48e49182005-12-19 17:11:22 -0500208 msg->errno = -EAGAIN;
Trond Myklebust9842ef32006-02-01 12:18:44 -0500209 list_del(&msg->list);
210 spin_unlock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 rpci->ops->destroy_msg(msg);
212 }
213 if (filp->f_mode & FMODE_WRITE)
214 rpci->nwriters --;
Trond Myklebust9842ef32006-02-01 12:18:44 -0500215 if (filp->f_mode & FMODE_READ) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216 rpci->nreaders --;
Trond Myklebust9842ef32006-02-01 12:18:44 -0500217 if (rpci->nreaders == 0) {
218 LIST_HEAD(free_list);
219 spin_lock(&inode->i_lock);
220 list_splice_init(&rpci->pipe, &free_list);
221 rpci->pipelen = 0;
222 spin_unlock(&inode->i_lock);
223 rpc_purge_list(rpci, &free_list,
224 rpci->ops->destroy_msg, -EAGAIN);
225 }
226 }
\"J. Bruce Fields\e7128042008-12-23 16:09:47 -0500227 last_close = rpci->nwriters == 0 && rpci->nreaders == 0;
228 if (last_close && rpci->ops->release_pipe)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 rpci->ops->release_pipe(inode);
230out:
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800231 mutex_unlock(&inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 return 0;
233}
234
235static ssize_t
236rpc_pipe_read(struct file *filp, char __user *buf, size_t len, loff_t *offset)
237{
Josef Sipek303b46b2006-12-08 02:37:42 -0800238 struct inode *inode = filp->f_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239 struct rpc_inode *rpci = RPC_I(inode);
240 struct rpc_pipe_msg *msg;
241 int res = 0;
242
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800243 mutex_lock(&inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244 if (rpci->ops == NULL) {
245 res = -EPIPE;
246 goto out_unlock;
247 }
248 msg = filp->private_data;
249 if (msg == NULL) {
Trond Myklebust9842ef32006-02-01 12:18:44 -0500250 spin_lock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 if (!list_empty(&rpci->pipe)) {
252 msg = list_entry(rpci->pipe.next,
253 struct rpc_pipe_msg,
254 list);
255 list_move(&msg->list, &rpci->in_upcall);
256 rpci->pipelen -= msg->len;
257 filp->private_data = msg;
258 msg->copied = 0;
259 }
Trond Myklebust9842ef32006-02-01 12:18:44 -0500260 spin_unlock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261 if (msg == NULL)
262 goto out_unlock;
263 }
264 /* NOTE: it is up to the callback to update msg->copied */
265 res = rpci->ops->upcall(filp, msg, buf, len);
266 if (res < 0 || msg->len == msg->copied) {
267 filp->private_data = NULL;
Trond Myklebust9842ef32006-02-01 12:18:44 -0500268 spin_lock(&inode->i_lock);
269 list_del(&msg->list);
270 spin_unlock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 rpci->ops->destroy_msg(msg);
272 }
273out_unlock:
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800274 mutex_unlock(&inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275 return res;
276}
277
278static ssize_t
279rpc_pipe_write(struct file *filp, const char __user *buf, size_t len, loff_t *offset)
280{
Josef Sipek303b46b2006-12-08 02:37:42 -0800281 struct inode *inode = filp->f_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 struct rpc_inode *rpci = RPC_I(inode);
283 int res;
284
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800285 mutex_lock(&inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286 res = -EPIPE;
287 if (rpci->ops != NULL)
288 res = rpci->ops->downcall(filp, buf, len);
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800289 mutex_unlock(&inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290 return res;
291}
292
293static unsigned int
294rpc_pipe_poll(struct file *filp, struct poll_table_struct *wait)
295{
296 struct rpc_inode *rpci;
297 unsigned int mask = 0;
298
Josef Sipek303b46b2006-12-08 02:37:42 -0800299 rpci = RPC_I(filp->f_path.dentry->d_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 poll_wait(filp, &rpci->waitq, wait);
301
302 mask = POLLOUT | POLLWRNORM;
303 if (rpci->ops == NULL)
304 mask |= POLLERR | POLLHUP;
J. Bruce Fieldseda4f9b2007-11-06 13:05:36 -0500305 if (filp->private_data || !list_empty(&rpci->pipe))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306 mask |= POLLIN | POLLRDNORM;
307 return mask;
308}
309
310static int
311rpc_pipe_ioctl(struct inode *ino, struct file *filp,
312 unsigned int cmd, unsigned long arg)
313{
Josef Sipek303b46b2006-12-08 02:37:42 -0800314 struct rpc_inode *rpci = RPC_I(filp->f_path.dentry->d_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315 int len;
316
317 switch (cmd) {
318 case FIONREAD:
319 if (rpci->ops == NULL)
320 return -EPIPE;
321 len = rpci->pipelen;
322 if (filp->private_data) {
323 struct rpc_pipe_msg *msg;
324 msg = (struct rpc_pipe_msg *)filp->private_data;
325 len += msg->len - msg->copied;
326 }
327 return put_user(len, (int __user *)arg);
328 default:
329 return -EINVAL;
330 }
331}
332
Arjan van de Venda7071d2007-02-12 00:55:36 -0800333static const struct file_operations rpc_pipe_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 .owner = THIS_MODULE,
335 .llseek = no_llseek,
336 .read = rpc_pipe_read,
337 .write = rpc_pipe_write,
338 .poll = rpc_pipe_poll,
339 .ioctl = rpc_pipe_ioctl,
340 .open = rpc_pipe_open,
341 .release = rpc_pipe_release,
342};
343
344static int
345rpc_show_info(struct seq_file *m, void *v)
346{
347 struct rpc_clnt *clnt = m->private;
348
349 seq_printf(m, "RPC server: %s\n", clnt->cl_server);
350 seq_printf(m, "service: %s (%d) version %d\n", clnt->cl_protname,
351 clnt->cl_prog, clnt->cl_vers);
Chuck Levere7f78652006-08-22 20:06:19 -0400352 seq_printf(m, "address: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_ADDR));
353 seq_printf(m, "protocol: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PROTO));
J. Bruce Fieldsbf19aac2007-09-26 14:38:09 -0400354 seq_printf(m, "port: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PORT));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355 return 0;
356}
357
358static int
359rpc_info_open(struct inode *inode, struct file *file)
360{
361 struct rpc_clnt *clnt;
362 int ret = single_open(file, rpc_show_info, NULL);
363
364 if (!ret) {
365 struct seq_file *m = file->private_data;
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800366 mutex_lock(&inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367 clnt = RPC_I(inode)->private;
368 if (clnt) {
Trond Myklebust34f52e32007-06-14 16:40:31 -0400369 kref_get(&clnt->cl_kref);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370 m->private = clnt;
371 } else {
372 single_release(inode, file);
373 ret = -EINVAL;
374 }
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800375 mutex_unlock(&inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 }
377 return ret;
378}
379
380static int
381rpc_info_release(struct inode *inode, struct file *file)
382{
383 struct seq_file *m = file->private_data;
384 struct rpc_clnt *clnt = (struct rpc_clnt *)m->private;
385
386 if (clnt)
387 rpc_release_client(clnt);
388 return single_release(inode, file);
389}
390
Arjan van de Venda7071d2007-02-12 00:55:36 -0800391static const struct file_operations rpc_info_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392 .owner = THIS_MODULE,
393 .open = rpc_info_open,
394 .read = seq_read,
395 .llseek = seq_lseek,
396 .release = rpc_info_release,
397};
398
399
400/*
401 * We have a single directory with 1 node in it.
402 */
403enum {
404 RPCAUTH_Root = 1,
405 RPCAUTH_lockd,
406 RPCAUTH_mount,
407 RPCAUTH_nfs,
408 RPCAUTH_portmap,
409 RPCAUTH_statd,
Olga Kornievskaia61054b12008-12-23 16:19:00 -0500410 RPCAUTH_nfsd4_cb,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411 RPCAUTH_RootEOF
412};
413
414/*
415 * Description of fs contents.
416 */
417struct rpc_filelist {
418 char *name;
Arjan van de Ven99ac48f2006-03-28 01:56:41 -0800419 const struct file_operations *i_fop;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420 int mode;
421};
422
423static struct rpc_filelist files[] = {
424 [RPCAUTH_lockd] = {
425 .name = "lockd",
426 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
427 },
428 [RPCAUTH_mount] = {
429 .name = "mount",
430 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
431 },
432 [RPCAUTH_nfs] = {
433 .name = "nfs",
434 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
435 },
436 [RPCAUTH_portmap] = {
437 .name = "portmap",
438 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
439 },
440 [RPCAUTH_statd] = {
441 .name = "statd",
442 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
443 },
Olga Kornievskaia61054b12008-12-23 16:19:00 -0500444 [RPCAUTH_nfsd4_cb] = {
445 .name = "nfsd4_cb",
446 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
447 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448};
449
450enum {
451 RPCAUTH_info = 2,
452 RPCAUTH_EOF
453};
454
455static struct rpc_filelist authfiles[] = {
456 [RPCAUTH_info] = {
457 .name = "info",
458 .i_fop = &rpc_info_operations,
459 .mode = S_IFREG | S_IRUSR,
460 },
461};
462
Trond Myklebust54281542006-03-20 13:44:49 -0500463struct vfsmount *rpc_get_mount(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464{
Trond Myklebust54281542006-03-20 13:44:49 -0500465 int err;
466
Trond Myklebust1f5ce9e2006-06-09 09:34:16 -0400467 err = simple_pin_fs(&rpc_pipe_fs_type, &rpc_mount, &rpc_mount_count);
Trond Myklebust54281542006-03-20 13:44:49 -0500468 if (err != 0)
469 return ERR_PTR(err);
470 return rpc_mount;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471}
472
Trond Myklebust54281542006-03-20 13:44:49 -0500473void rpc_put_mount(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474{
475 simple_release_fs(&rpc_mount, &rpc_mount_count);
476}
477
Trond Myklebust62e17612007-06-08 14:14:46 -0400478static int rpc_delete_dentry(struct dentry *dentry)
479{
480 return 1;
481}
482
Al Viro3ba13d12009-02-20 06:02:22 +0000483static const struct dentry_operations rpc_dentry_operations = {
Trond Myklebust62e17612007-06-08 14:14:46 -0400484 .d_delete = rpc_delete_dentry,
485};
486
Trond Myklebustf1345852005-09-23 11:08:25 -0400487static int
488rpc_lookup_parent(char *path, struct nameidata *nd)
489{
Josef 'Jeff' Sipek4ac4efc2007-07-19 01:48:20 -0700490 struct vfsmount *mnt;
491
Trond Myklebustf1345852005-09-23 11:08:25 -0400492 if (path[0] == '\0')
493 return -ENOENT;
Josef 'Jeff' Sipek4ac4efc2007-07-19 01:48:20 -0700494
495 mnt = rpc_get_mount();
496 if (IS_ERR(mnt)) {
Trond Myklebustf1345852005-09-23 11:08:25 -0400497 printk(KERN_WARNING "%s: %s failed to mount "
Harvey Harrison0dc47872008-03-05 20:47:47 -0800498 "pseudofilesystem \n", __FILE__, __func__);
Josef 'Jeff' Sipek4ac4efc2007-07-19 01:48:20 -0700499 return PTR_ERR(mnt);
Trond Myklebustf1345852005-09-23 11:08:25 -0400500 }
Trond Myklebustf1345852005-09-23 11:08:25 -0400501
Josef 'Jeff' Sipek4ac4efc2007-07-19 01:48:20 -0700502 if (vfs_path_lookup(mnt->mnt_root, mnt, path, LOOKUP_PARENT, nd)) {
Trond Myklebustf1345852005-09-23 11:08:25 -0400503 printk(KERN_WARNING "%s: %s failed to find path %s\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800504 __FILE__, __func__, path);
Trond Myklebustf1345852005-09-23 11:08:25 -0400505 rpc_put_mount();
506 return -ENOENT;
507 }
508 return 0;
509}
510
511static void
512rpc_release_path(struct nameidata *nd)
513{
Jan Blunck1d957f92008-02-14 19:34:35 -0800514 path_put(&nd->path);
Trond Myklebustf1345852005-09-23 11:08:25 -0400515 rpc_put_mount();
516}
517
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518static struct inode *
519rpc_get_inode(struct super_block *sb, int mode)
520{
521 struct inode *inode = new_inode(sb);
522 if (!inode)
523 return NULL;
524 inode->i_mode = mode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
526 switch(mode & S_IFMT) {
527 case S_IFDIR:
528 inode->i_fop = &simple_dir_operations;
529 inode->i_op = &simple_dir_inode_operations;
Dave Hansend8c76e62006-09-30 23:29:04 -0700530 inc_nlink(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531 default:
532 break;
533 }
534 return inode;
535}
536
537/*
538 * FIXME: This probably has races.
539 */
Chuck Lever9b45b742007-10-26 13:31:04 -0400540static void rpc_depopulate(struct dentry *parent,
541 unsigned long start, unsigned long eof)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542{
543 struct inode *dir = parent->d_inode;
544 struct list_head *pos, *next;
545 struct dentry *dentry, *dvec[10];
546 int n = 0;
547
Arjan van de Venc6573c22006-07-03 00:25:16 -0700548 mutex_lock_nested(&dir->i_mutex, I_MUTEX_CHILD);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549repeat:
550 spin_lock(&dcache_lock);
551 list_for_each_safe(pos, next, &parent->d_subdirs) {
Eric Dumazet5160ee62006-01-08 01:03:32 -0800552 dentry = list_entry(pos, struct dentry, d_u.d_child);
Trond Myklebust62e17612007-06-08 14:14:46 -0400553 if (!dentry->d_inode ||
554 dentry->d_inode->i_ino < start ||
555 dentry->d_inode->i_ino >= eof)
556 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557 spin_lock(&dentry->d_lock);
558 if (!d_unhashed(dentry)) {
559 dget_locked(dentry);
560 __d_drop(dentry);
561 spin_unlock(&dentry->d_lock);
562 dvec[n++] = dentry;
563 if (n == ARRAY_SIZE(dvec))
564 break;
565 } else
566 spin_unlock(&dentry->d_lock);
567 }
568 spin_unlock(&dcache_lock);
569 if (n) {
570 do {
571 dentry = dvec[--n];
Trond Myklebust62e17612007-06-08 14:14:46 -0400572 if (S_ISREG(dentry->d_inode->i_mode))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573 simple_unlink(dir, dentry);
Trond Myklebust62e17612007-06-08 14:14:46 -0400574 else if (S_ISDIR(dentry->d_inode->i_mode))
575 simple_rmdir(dir, dentry);
576 d_delete(dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577 dput(dentry);
578 } while (n);
579 goto repeat;
580 }
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800581 mutex_unlock(&dir->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582}
583
584static int
585rpc_populate(struct dentry *parent,
586 struct rpc_filelist *files,
587 int start, int eof)
588{
589 struct inode *inode, *dir = parent->d_inode;
590 void *private = RPC_I(dir)->private;
591 struct dentry *dentry;
592 int mode, i;
593
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800594 mutex_lock(&dir->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595 for (i = start; i < eof; i++) {
596 dentry = d_alloc_name(parent, files[i].name);
597 if (!dentry)
598 goto out_bad;
Trond Myklebust62e17612007-06-08 14:14:46 -0400599 dentry->d_op = &rpc_dentry_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600 mode = files[i].mode;
601 inode = rpc_get_inode(dir->i_sb, mode);
602 if (!inode) {
603 dput(dentry);
604 goto out_bad;
605 }
606 inode->i_ino = i;
607 if (files[i].i_fop)
608 inode->i_fop = files[i].i_fop;
609 if (private)
610 rpc_inode_setowner(inode, private);
611 if (S_ISDIR(mode))
Dave Hansend8c76e62006-09-30 23:29:04 -0700612 inc_nlink(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613 d_add(dentry, inode);
Trond Myklebust50e437d2007-06-07 22:44:34 -0400614 fsnotify_create(dir, dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615 }
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800616 mutex_unlock(&dir->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617 return 0;
618out_bad:
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800619 mutex_unlock(&dir->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620 printk(KERN_WARNING "%s: %s failed to populate directory %s\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800621 __FILE__, __func__, parent->d_name.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622 return -ENOMEM;
623}
624
Trond Myklebustf1345852005-09-23 11:08:25 -0400625static int
626__rpc_mkdir(struct inode *dir, struct dentry *dentry)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627{
628 struct inode *inode;
629
Trond Myklebust1d216322007-02-02 15:56:06 -0800630 inode = rpc_get_inode(dir->i_sb, S_IFDIR | S_IRUGO | S_IXUGO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631 if (!inode)
Trond Myklebustf1345852005-09-23 11:08:25 -0400632 goto out_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633 inode->i_ino = iunique(dir->i_sb, 100);
Christoph Hellwig278c9952005-07-24 23:53:01 +0100634 d_instantiate(dentry, inode);
Dave Hansend8c76e62006-09-30 23:29:04 -0700635 inc_nlink(dir);
Trond Myklebust50e437d2007-06-07 22:44:34 -0400636 fsnotify_mkdir(dir, dentry);
Trond Myklebustf1345852005-09-23 11:08:25 -0400637 return 0;
638out_err:
639 printk(KERN_WARNING "%s: %s failed to allocate inode for dentry %s\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800640 __FILE__, __func__, dentry->d_name.name);
Trond Myklebustf1345852005-09-23 11:08:25 -0400641 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642}
643
Trond Myklebustf1345852005-09-23 11:08:25 -0400644static int
645__rpc_rmdir(struct inode *dir, struct dentry *dentry)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646{
Trond Myklebustf1345852005-09-23 11:08:25 -0400647 int error;
Trond Myklebust62e17612007-06-08 14:14:46 -0400648 error = simple_rmdir(dir, dentry);
649 if (!error)
650 d_delete(dentry);
651 return error;
Trond Myklebustf1345852005-09-23 11:08:25 -0400652}
Christoph Hellwig278c9952005-07-24 23:53:01 +0100653
Trond Myklebustf1345852005-09-23 11:08:25 -0400654static struct dentry *
Trond Myklebust34f30892007-06-07 18:28:02 -0400655rpc_lookup_create(struct dentry *parent, const char *name, int len, int exclusive)
Trond Myklebustf1345852005-09-23 11:08:25 -0400656{
Trond Myklebust158998b2006-08-24 01:03:17 -0400657 struct inode *dir = parent->d_inode;
Trond Myklebustf1345852005-09-23 11:08:25 -0400658 struct dentry *dentry;
Trond Myklebustf1345852005-09-23 11:08:25 -0400659
Arjan van de Venc6573c22006-07-03 00:25:16 -0700660 mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
Trond Myklebust158998b2006-08-24 01:03:17 -0400661 dentry = lookup_one_len(name, parent, len);
Trond Myklebustf1345852005-09-23 11:08:25 -0400662 if (IS_ERR(dentry))
663 goto out_err;
Trond Myklebust62e17612007-06-08 14:14:46 -0400664 if (!dentry->d_inode)
665 dentry->d_op = &rpc_dentry_operations;
666 else if (exclusive) {
Trond Myklebustf1345852005-09-23 11:08:25 -0400667 dput(dentry);
668 dentry = ERR_PTR(-EEXIST);
669 goto out_err;
670 }
671 return dentry;
672out_err:
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800673 mutex_unlock(&dir->i_mutex);
Trond Myklebust158998b2006-08-24 01:03:17 -0400674 return dentry;
675}
676
677static struct dentry *
678rpc_lookup_negative(char *path, struct nameidata *nd)
679{
680 struct dentry *dentry;
681 int error;
682
683 if ((error = rpc_lookup_parent(path, nd)) != 0)
684 return ERR_PTR(error);
Jan Blunck4ac91372008-02-14 19:34:32 -0800685 dentry = rpc_lookup_create(nd->path.dentry, nd->last.name, nd->last.len,
686 1);
Trond Myklebust158998b2006-08-24 01:03:17 -0400687 if (IS_ERR(dentry))
688 rpc_release_path(nd);
Trond Myklebustf1345852005-09-23 11:08:25 -0400689 return dentry;
690}
691
J. Bruce Fields93a44a72007-11-06 13:06:03 -0500692/**
693 * rpc_mkdir - Create a new directory in rpc_pipefs
694 * @path: path from the rpc_pipefs root to the new directory
Randy Dunlap65b6e422008-02-13 15:03:23 -0800695 * @rpc_client: rpc client to associate with this directory
J. Bruce Fields93a44a72007-11-06 13:06:03 -0500696 *
697 * This creates a directory at the given @path associated with
698 * @rpc_clnt, which will contain a file named "info" with some basic
699 * information about the client, together with any "pipes" that may
700 * later be created using rpc_mkpipe().
701 */
Trond Myklebustf1345852005-09-23 11:08:25 -0400702struct dentry *
703rpc_mkdir(char *path, struct rpc_clnt *rpc_client)
704{
705 struct nameidata nd;
706 struct dentry *dentry;
707 struct inode *dir;
708 int error;
709
710 dentry = rpc_lookup_negative(path, &nd);
711 if (IS_ERR(dentry))
712 return dentry;
Jan Blunck4ac91372008-02-14 19:34:32 -0800713 dir = nd.path.dentry->d_inode;
Trond Myklebustf1345852005-09-23 11:08:25 -0400714 if ((error = __rpc_mkdir(dir, dentry)) != 0)
715 goto err_dput;
716 RPC_I(dentry->d_inode)->private = rpc_client;
717 error = rpc_populate(dentry, authfiles,
718 RPCAUTH_info, RPCAUTH_EOF);
719 if (error)
720 goto err_depopulate;
Trond Myklebust5c3e9852006-07-29 17:37:40 -0400721 dget(dentry);
Trond Myklebustf1345852005-09-23 11:08:25 -0400722out:
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800723 mutex_unlock(&dir->i_mutex);
Trond Myklebustf1345852005-09-23 11:08:25 -0400724 rpc_release_path(&nd);
Trond Myklebust5c3e9852006-07-29 17:37:40 -0400725 return dentry;
Trond Myklebustf1345852005-09-23 11:08:25 -0400726err_depopulate:
Trond Myklebust62e17612007-06-08 14:14:46 -0400727 rpc_depopulate(dentry, RPCAUTH_info, RPCAUTH_EOF);
Trond Myklebustf1345852005-09-23 11:08:25 -0400728 __rpc_rmdir(dir, dentry);
729err_dput:
730 dput(dentry);
731 printk(KERN_WARNING "%s: %s() failed to create directory %s (errno = %d)\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800732 __FILE__, __func__, path, error);
Trond Myklebustf1345852005-09-23 11:08:25 -0400733 dentry = ERR_PTR(error);
734 goto out;
735}
736
J. Bruce Fields93a44a72007-11-06 13:06:03 -0500737/**
738 * rpc_rmdir - Remove a directory created with rpc_mkdir()
739 * @dentry: directory to remove
740 */
Trond Myklebustf1345852005-09-23 11:08:25 -0400741int
Trond Myklebustdff02cc2006-07-31 14:17:18 -0700742rpc_rmdir(struct dentry *dentry)
Trond Myklebustf1345852005-09-23 11:08:25 -0400743{
Trond Myklebustdff02cc2006-07-31 14:17:18 -0700744 struct dentry *parent;
Trond Myklebustf1345852005-09-23 11:08:25 -0400745 struct inode *dir;
746 int error;
747
Trond Myklebustdff02cc2006-07-31 14:17:18 -0700748 parent = dget_parent(dentry);
749 dir = parent->d_inode;
Arjan van de Venc6573c22006-07-03 00:25:16 -0700750 mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
Trond Myklebust62e17612007-06-08 14:14:46 -0400751 rpc_depopulate(dentry, RPCAUTH_info, RPCAUTH_EOF);
Trond Myklebustf1345852005-09-23 11:08:25 -0400752 error = __rpc_rmdir(dir, dentry);
753 dput(dentry);
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800754 mutex_unlock(&dir->i_mutex);
Trond Myklebustdff02cc2006-07-31 14:17:18 -0700755 dput(parent);
Trond Myklebustf1345852005-09-23 11:08:25 -0400756 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700757}
758
J. Bruce Fields93a44a72007-11-06 13:06:03 -0500759/**
760 * rpc_mkpipe - make an rpc_pipefs file for kernel<->userspace communication
761 * @parent: dentry of directory to create new "pipe" in
762 * @name: name of pipe
763 * @private: private data to associate with the pipe, for the caller's use
764 * @ops: operations defining the behavior of the pipe: upcall, downcall,
\"J. Bruce Fields\c3810602008-12-23 16:08:32 -0500765 * release_pipe, open_pipe, and destroy_msg.
Randy Dunlap65b6e422008-02-13 15:03:23 -0800766 * @flags: rpc_inode flags
J. Bruce Fields93a44a72007-11-06 13:06:03 -0500767 *
768 * Data is made available for userspace to read by calls to
769 * rpc_queue_upcall(). The actual reads will result in calls to
770 * @ops->upcall, which will be called with the file pointer,
771 * message, and userspace buffer to copy to.
772 *
773 * Writes can come at any time, and do not necessarily have to be
774 * responses to upcalls. They will result in calls to @msg->downcall.
775 *
776 * The @private argument passed here will be available to all these methods
777 * from the file pointer, via RPC_I(file->f_dentry->d_inode)->private.
778 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779struct dentry *
Trond Myklebust158998b2006-08-24 01:03:17 -0400780rpc_mkpipe(struct dentry *parent, const char *name, void *private, struct rpc_pipe_ops *ops, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782 struct dentry *dentry;
Trond Myklebustf1345852005-09-23 11:08:25 -0400783 struct inode *dir, *inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784 struct rpc_inode *rpci;
785
Trond Myklebust34f30892007-06-07 18:28:02 -0400786 dentry = rpc_lookup_create(parent, name, strlen(name), 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787 if (IS_ERR(dentry))
Trond Myklebustf1345852005-09-23 11:08:25 -0400788 return dentry;
Trond Myklebust158998b2006-08-24 01:03:17 -0400789 dir = parent->d_inode;
Trond Myklebust34f30892007-06-07 18:28:02 -0400790 if (dentry->d_inode) {
791 rpci = RPC_I(dentry->d_inode);
792 if (rpci->private != private ||
793 rpci->ops != ops ||
794 rpci->flags != flags) {
795 dput (dentry);
796 dentry = ERR_PTR(-EBUSY);
797 }
Trond Myklebust03a12562007-06-08 14:14:53 -0400798 rpci->nkern_readwriters++;
Trond Myklebust34f30892007-06-07 18:28:02 -0400799 goto out;
800 }
Steve Dicksona53a3c52006-09-06 11:51:21 -0400801 inode = rpc_get_inode(dir->i_sb, S_IFIFO | S_IRUSR | S_IWUSR);
Trond Myklebustf1345852005-09-23 11:08:25 -0400802 if (!inode)
803 goto err_dput;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700804 inode->i_ino = iunique(dir->i_sb, 100);
805 inode->i_fop = &rpc_pipe_fops;
Trond Myklebustf1345852005-09-23 11:08:25 -0400806 d_instantiate(dentry, inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807 rpci = RPC_I(inode);
808 rpci->private = private;
809 rpci->flags = flags;
810 rpci->ops = ops;
Trond Myklebust03a12562007-06-08 14:14:53 -0400811 rpci->nkern_readwriters = 1;
Trond Myklebust50e437d2007-06-07 22:44:34 -0400812 fsnotify_create(dir, dentry);
Trond Myklebust5c3e9852006-07-29 17:37:40 -0400813 dget(dentry);
Trond Myklebustf1345852005-09-23 11:08:25 -0400814out:
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800815 mutex_unlock(&dir->i_mutex);
Trond Myklebust5c3e9852006-07-29 17:37:40 -0400816 return dentry;
Trond Myklebustf1345852005-09-23 11:08:25 -0400817err_dput:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700818 dput(dentry);
Trond Myklebustf1345852005-09-23 11:08:25 -0400819 dentry = ERR_PTR(-ENOMEM);
Trond Myklebust158998b2006-08-24 01:03:17 -0400820 printk(KERN_WARNING "%s: %s() failed to create pipe %s/%s (errno = %d)\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800821 __FILE__, __func__, parent->d_name.name, name,
Trond Myklebust158998b2006-08-24 01:03:17 -0400822 -ENOMEM);
Trond Myklebustf1345852005-09-23 11:08:25 -0400823 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700824}
Trond Myklebust468039e2008-12-23 15:21:31 -0500825EXPORT_SYMBOL_GPL(rpc_mkpipe);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700826
J. Bruce Fields93a44a72007-11-06 13:06:03 -0500827/**
828 * rpc_unlink - remove a pipe
829 * @dentry: dentry for the pipe, as returned from rpc_mkpipe
830 *
831 * After this call, lookups will no longer find the pipe, and any
832 * attempts to read or write using preexisting opens of the pipe will
833 * return -EPIPE.
834 */
Trond Myklebustf1345852005-09-23 11:08:25 -0400835int
Trond Myklebust5d674762006-07-31 14:11:48 -0700836rpc_unlink(struct dentry *dentry)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700837{
Trond Myklebust5d674762006-07-31 14:11:48 -0700838 struct dentry *parent;
Trond Myklebustf1345852005-09-23 11:08:25 -0400839 struct inode *dir;
Trond Myklebust5d674762006-07-31 14:11:48 -0700840 int error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700841
Trond Myklebust5d674762006-07-31 14:11:48 -0700842 parent = dget_parent(dentry);
843 dir = parent->d_inode;
Arjan van de Venc6573c22006-07-03 00:25:16 -0700844 mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
Trond Myklebust03a12562007-06-08 14:14:53 -0400845 if (--RPC_I(dentry->d_inode)->nkern_readwriters == 0) {
846 rpc_close_pipes(dentry->d_inode);
847 error = simple_unlink(dir, dentry);
848 if (!error)
849 d_delete(dentry);
850 }
Trond Myklebustf1345852005-09-23 11:08:25 -0400851 dput(dentry);
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800852 mutex_unlock(&dir->i_mutex);
Trond Myklebust5d674762006-07-31 14:11:48 -0700853 dput(parent);
Trond Myklebustf1345852005-09-23 11:08:25 -0400854 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855}
Trond Myklebust468039e2008-12-23 15:21:31 -0500856EXPORT_SYMBOL_GPL(rpc_unlink);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857
858/*
859 * populate the filesystem
860 */
861static struct super_operations s_ops = {
862 .alloc_inode = rpc_alloc_inode,
863 .destroy_inode = rpc_destroy_inode,
864 .statfs = simple_statfs,
865};
866
867#define RPCAUTH_GSSMAGIC 0x67596969
868
869static int
870rpc_fill_super(struct super_block *sb, void *data, int silent)
871{
872 struct inode *inode;
873 struct dentry *root;
874
875 sb->s_blocksize = PAGE_CACHE_SIZE;
876 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
877 sb->s_magic = RPCAUTH_GSSMAGIC;
878 sb->s_op = &s_ops;
879 sb->s_time_gran = 1;
880
881 inode = rpc_get_inode(sb, S_IFDIR | 0755);
882 if (!inode)
883 return -ENOMEM;
884 root = d_alloc_root(inode);
885 if (!root) {
886 iput(inode);
887 return -ENOMEM;
888 }
889 if (rpc_populate(root, files, RPCAUTH_Root + 1, RPCAUTH_RootEOF))
890 goto out;
891 sb->s_root = root;
892 return 0;
893out:
894 d_genocide(root);
895 dput(root);
896 return -ENOMEM;
897}
898
David Howells454e2392006-06-23 02:02:57 -0700899static int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900rpc_get_sb(struct file_system_type *fs_type,
David Howells454e2392006-06-23 02:02:57 -0700901 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902{
David Howells454e2392006-06-23 02:02:57 -0700903 return get_sb_single(fs_type, flags, data, rpc_fill_super, mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700904}
905
906static struct file_system_type rpc_pipe_fs_type = {
907 .owner = THIS_MODULE,
908 .name = "rpc_pipefs",
909 .get_sb = rpc_get_sb,
910 .kill_sb = kill_litter_super,
911};
912
913static void
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700914init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700915{
916 struct rpc_inode *rpci = (struct rpc_inode *) foo;
917
Christoph Lametera35afb82007-05-16 22:10:57 -0700918 inode_init_once(&rpci->vfs_inode);
919 rpci->private = NULL;
920 rpci->nreaders = 0;
921 rpci->nwriters = 0;
922 INIT_LIST_HEAD(&rpci->in_upcall);
Trond Myklebust6e84c7b2007-06-07 15:31:36 -0400923 INIT_LIST_HEAD(&rpci->in_downcall);
Christoph Lametera35afb82007-05-16 22:10:57 -0700924 INIT_LIST_HEAD(&rpci->pipe);
925 rpci->pipelen = 0;
926 init_waitqueue_head(&rpci->waitq);
927 INIT_DELAYED_WORK(&rpci->queue_timeout,
928 rpc_timeout_upcall_queue);
929 rpci->ops = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700930}
931
932int register_rpc_pipefs(void)
933{
Akinobu Mita5bd5f582007-05-09 02:34:51 -0700934 int err;
935
Linus Torvalds1da177e2005-04-16 15:20:36 -0700936 rpc_inode_cachep = kmem_cache_create("rpc_inode_cache",
Paul Jacksonfffb60f2006-03-24 03:16:06 -0800937 sizeof(struct rpc_inode),
938 0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
939 SLAB_MEM_SPREAD),
Paul Mundt20c2df82007-07-20 10:11:58 +0900940 init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700941 if (!rpc_inode_cachep)
942 return -ENOMEM;
Akinobu Mita5bd5f582007-05-09 02:34:51 -0700943 err = register_filesystem(&rpc_pipe_fs_type);
944 if (err) {
945 kmem_cache_destroy(rpc_inode_cachep);
946 return err;
947 }
948
Linus Torvalds1da177e2005-04-16 15:20:36 -0700949 return 0;
950}
951
952void unregister_rpc_pipefs(void)
953{
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -0700954 kmem_cache_destroy(rpc_inode_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700955 unregister_filesystem(&rpc_pipe_fs_type);
956}