blob: a0dc1a86fcea68126ebca5a4a30141036a3f85ce [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>
Trond Myklebust8854e822009-08-09 15:14:30 -040029#include <linux/sunrpc/cache.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070030
Al Virofc14f2f2010-07-25 01:48:30 +040031static struct vfsmount *rpc_mnt __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -070032static int rpc_mount_count;
33
34static struct file_system_type rpc_pipe_fs_type;
35
36
Christoph Lametere18b8902006-12-06 20:33:20 -080037static struct kmem_cache *rpc_inode_cachep __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
39#define RPC_UPCALL_TIMEOUT (30*HZ)
40
Trond Myklebust9842ef32006-02-01 12:18:44 -050041static void rpc_purge_list(struct rpc_inode *rpci, struct list_head *head,
42 void (*destroy_msg)(struct rpc_pipe_msg *), int err)
Trond Myklebustb3eb67a2005-11-25 17:10:11 -050043{
44 struct rpc_pipe_msg *msg;
Trond Myklebustb3eb67a2005-11-25 17:10:11 -050045
Trond Myklebust9842ef32006-02-01 12:18:44 -050046 if (list_empty(head))
47 return;
48 do {
Trond Myklebustb3eb67a2005-11-25 17:10:11 -050049 msg = list_entry(head->next, struct rpc_pipe_msg, list);
Trond Myklebust5a676572010-09-12 19:55:25 -040050 list_del_init(&msg->list);
Trond Myklebustb3eb67a2005-11-25 17:10:11 -050051 msg->errno = err;
52 destroy_msg(msg);
Trond Myklebust9842ef32006-02-01 12:18:44 -050053 } while (!list_empty(head));
Linus Torvalds1da177e2005-04-16 15:20:36 -070054 wake_up(&rpci->waitq);
55}
56
57static void
David Howells65f27f32006-11-22 14:55:48 +000058rpc_timeout_upcall_queue(struct work_struct *work)
Linus Torvalds1da177e2005-04-16 15:20:36 -070059{
Trond Myklebust9842ef32006-02-01 12:18:44 -050060 LIST_HEAD(free_list);
David Howells65f27f32006-11-22 14:55:48 +000061 struct rpc_inode *rpci =
62 container_of(work, struct rpc_inode, queue_timeout.work);
Linus Torvalds1da177e2005-04-16 15:20:36 -070063 struct inode *inode = &rpci->vfs_inode;
Trond Myklebust9842ef32006-02-01 12:18:44 -050064 void (*destroy_msg)(struct rpc_pipe_msg *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070065
Trond Myklebust9842ef32006-02-01 12:18:44 -050066 spin_lock(&inode->i_lock);
67 if (rpci->ops == NULL) {
68 spin_unlock(&inode->i_lock);
69 return;
70 }
71 destroy_msg = rpci->ops->destroy_msg;
72 if (rpci->nreaders == 0) {
73 list_splice_init(&rpci->pipe, &free_list);
74 rpci->pipelen = 0;
75 }
76 spin_unlock(&inode->i_lock);
77 rpc_purge_list(rpci, &free_list, destroy_msg, -ETIMEDOUT);
Linus Torvalds1da177e2005-04-16 15:20:36 -070078}
79
J. Bruce Fields93a44a72007-11-06 13:06:03 -050080/**
Ben Hutchings1a5778a2010-02-14 22:35:47 -080081 * rpc_queue_upcall - queue an upcall message to userspace
J. Bruce Fields93a44a72007-11-06 13:06:03 -050082 * @inode: inode of upcall pipe on which to queue given message
83 * @msg: message to queue
84 *
85 * Call with an @inode created by rpc_mkpipe() to queue an upcall.
86 * A userspace process may then later read the upcall by performing a
87 * read on an open file for this inode. It is up to the caller to
88 * initialize the fields of @msg (other than @msg->list) appropriately.
89 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070090int
91rpc_queue_upcall(struct inode *inode, struct rpc_pipe_msg *msg)
92{
93 struct rpc_inode *rpci = RPC_I(inode);
Trond Myklebust6070fe62005-10-27 22:12:46 -040094 int res = -EPIPE;
Linus Torvalds1da177e2005-04-16 15:20:36 -070095
Trond Myklebust9842ef32006-02-01 12:18:44 -050096 spin_lock(&inode->i_lock);
Trond Myklebust6070fe62005-10-27 22:12:46 -040097 if (rpci->ops == NULL)
98 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 if (rpci->nreaders) {
100 list_add_tail(&msg->list, &rpci->pipe);
101 rpci->pipelen += msg->len;
Trond Myklebust6070fe62005-10-27 22:12:46 -0400102 res = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 } else if (rpci->flags & RPC_PIPE_WAIT_FOR_OPEN) {
104 if (list_empty(&rpci->pipe))
Trond Myklebust24c5d9d2006-03-20 13:44:08 -0500105 queue_delayed_work(rpciod_workqueue,
106 &rpci->queue_timeout,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107 RPC_UPCALL_TIMEOUT);
108 list_add_tail(&msg->list, &rpci->pipe);
109 rpci->pipelen += msg->len;
Trond Myklebust6070fe62005-10-27 22:12:46 -0400110 res = 0;
111 }
112out:
Trond Myklebust9842ef32006-02-01 12:18:44 -0500113 spin_unlock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 wake_up(&rpci->waitq);
115 return res;
116}
Trond Myklebust468039e2008-12-23 15:21:31 -0500117EXPORT_SYMBOL_GPL(rpc_queue_upcall);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118
Trond Myklebust6070fe62005-10-27 22:12:46 -0400119static inline void
120rpc_inode_setowner(struct inode *inode, void *private)
121{
122 RPC_I(inode)->private = private;
123}
124
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125static void
126rpc_close_pipes(struct inode *inode)
127{
128 struct rpc_inode *rpci = RPC_I(inode);
Trond Myklebustb693ba42009-08-09 15:14:15 -0400129 const struct rpc_pipe_ops *ops;
\"J. Bruce Fields\e7128042008-12-23 16:09:47 -0500130 int need_release;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800132 mutex_lock(&inode->i_mutex);
Trond Myklebust9842ef32006-02-01 12:18:44 -0500133 ops = rpci->ops;
134 if (ops != NULL) {
135 LIST_HEAD(free_list);
Trond Myklebust9842ef32006-02-01 12:18:44 -0500136 spin_lock(&inode->i_lock);
\"J. Bruce Fields\e7128042008-12-23 16:09:47 -0500137 need_release = rpci->nreaders != 0 || rpci->nwriters != 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 rpci->nreaders = 0;
Trond Myklebust9842ef32006-02-01 12:18:44 -0500139 list_splice_init(&rpci->in_upcall, &free_list);
140 list_splice_init(&rpci->pipe, &free_list);
141 rpci->pipelen = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 rpci->ops = NULL;
Trond Myklebust9842ef32006-02-01 12:18:44 -0500143 spin_unlock(&inode->i_lock);
144 rpc_purge_list(rpci, &free_list, ops->destroy_msg, -EPIPE);
145 rpci->nwriters = 0;
\"J. Bruce Fields\e7128042008-12-23 16:09:47 -0500146 if (need_release && ops->release_pipe)
Trond Myklebust9842ef32006-02-01 12:18:44 -0500147 ops->release_pipe(inode);
Trond Myklebust4011cd92007-08-07 15:33:01 -0400148 cancel_delayed_work_sync(&rpci->queue_timeout);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149 }
Trond Myklebust6070fe62005-10-27 22:12:46 -0400150 rpc_inode_setowner(inode, NULL);
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800151 mutex_unlock(&inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152}
153
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154static struct inode *
155rpc_alloc_inode(struct super_block *sb)
156{
157 struct rpc_inode *rpci;
Christoph Lametere94b1762006-12-06 20:33:17 -0800158 rpci = (struct rpc_inode *)kmem_cache_alloc(rpc_inode_cachep, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 if (!rpci)
160 return NULL;
161 return &rpci->vfs_inode;
162}
163
164static void
165rpc_destroy_inode(struct inode *inode)
166{
167 kmem_cache_free(rpc_inode_cachep, RPC_I(inode));
168}
169
170static int
171rpc_pipe_open(struct inode *inode, struct file *filp)
172{
173 struct rpc_inode *rpci = RPC_I(inode);
\"J. Bruce Fields\c3810602008-12-23 16:08:32 -0500174 int first_open;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 int res = -ENXIO;
176
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800177 mutex_lock(&inode->i_mutex);
\"J. Bruce Fields\c3810602008-12-23 16:08:32 -0500178 if (rpci->ops == NULL)
179 goto out;
180 first_open = rpci->nreaders == 0 && rpci->nwriters == 0;
181 if (first_open && rpci->ops->open_pipe) {
182 res = rpci->ops->open_pipe(inode);
183 if (res)
184 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 }
\"J. Bruce Fields\c3810602008-12-23 16:08:32 -0500186 if (filp->f_mode & FMODE_READ)
187 rpci->nreaders++;
188 if (filp->f_mode & FMODE_WRITE)
189 rpci->nwriters++;
190 res = 0;
191out:
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800192 mutex_unlock(&inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 return res;
194}
195
196static int
197rpc_pipe_release(struct inode *inode, struct file *filp)
198{
Trond Myklebust969b7f22006-01-03 09:55:36 +0100199 struct rpc_inode *rpci = RPC_I(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 struct rpc_pipe_msg *msg;
\"J. Bruce Fields\e7128042008-12-23 16:09:47 -0500201 int last_close;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800203 mutex_lock(&inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 if (rpci->ops == NULL)
205 goto out;
Joe Perches655b5bb2010-09-04 18:52:53 -0700206 msg = filp->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 if (msg != NULL) {
Trond Myklebust9842ef32006-02-01 12:18:44 -0500208 spin_lock(&inode->i_lock);
Trond Myklebust48e49182005-12-19 17:11:22 -0500209 msg->errno = -EAGAIN;
Trond Myklebust5a676572010-09-12 19:55:25 -0400210 list_del_init(&msg->list);
Trond Myklebust9842ef32006-02-01 12:18:44 -0500211 spin_unlock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 rpci->ops->destroy_msg(msg);
213 }
214 if (filp->f_mode & FMODE_WRITE)
215 rpci->nwriters --;
Trond Myklebust9842ef32006-02-01 12:18:44 -0500216 if (filp->f_mode & FMODE_READ) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 rpci->nreaders --;
Trond Myklebust9842ef32006-02-01 12:18:44 -0500218 if (rpci->nreaders == 0) {
219 LIST_HEAD(free_list);
220 spin_lock(&inode->i_lock);
221 list_splice_init(&rpci->pipe, &free_list);
222 rpci->pipelen = 0;
223 spin_unlock(&inode->i_lock);
224 rpc_purge_list(rpci, &free_list,
225 rpci->ops->destroy_msg, -EAGAIN);
226 }
227 }
\"J. Bruce Fields\e7128042008-12-23 16:09:47 -0500228 last_close = rpci->nwriters == 0 && rpci->nreaders == 0;
229 if (last_close && rpci->ops->release_pipe)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 rpci->ops->release_pipe(inode);
231out:
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800232 mutex_unlock(&inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 return 0;
234}
235
236static ssize_t
237rpc_pipe_read(struct file *filp, char __user *buf, size_t len, loff_t *offset)
238{
Josef Sipek303b46b2006-12-08 02:37:42 -0800239 struct inode *inode = filp->f_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240 struct rpc_inode *rpci = RPC_I(inode);
241 struct rpc_pipe_msg *msg;
242 int res = 0;
243
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800244 mutex_lock(&inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 if (rpci->ops == NULL) {
246 res = -EPIPE;
247 goto out_unlock;
248 }
249 msg = filp->private_data;
250 if (msg == NULL) {
Trond Myklebust9842ef32006-02-01 12:18:44 -0500251 spin_lock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 if (!list_empty(&rpci->pipe)) {
253 msg = list_entry(rpci->pipe.next,
254 struct rpc_pipe_msg,
255 list);
256 list_move(&msg->list, &rpci->in_upcall);
257 rpci->pipelen -= msg->len;
258 filp->private_data = msg;
259 msg->copied = 0;
260 }
Trond Myklebust9842ef32006-02-01 12:18:44 -0500261 spin_unlock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 if (msg == NULL)
263 goto out_unlock;
264 }
265 /* NOTE: it is up to the callback to update msg->copied */
266 res = rpci->ops->upcall(filp, msg, buf, len);
267 if (res < 0 || msg->len == msg->copied) {
268 filp->private_data = NULL;
Trond Myklebust9842ef32006-02-01 12:18:44 -0500269 spin_lock(&inode->i_lock);
Trond Myklebust5a676572010-09-12 19:55:25 -0400270 list_del_init(&msg->list);
Trond Myklebust9842ef32006-02-01 12:18:44 -0500271 spin_unlock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 rpci->ops->destroy_msg(msg);
273 }
274out_unlock:
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800275 mutex_unlock(&inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276 return res;
277}
278
279static ssize_t
280rpc_pipe_write(struct file *filp, const char __user *buf, size_t len, loff_t *offset)
281{
Josef Sipek303b46b2006-12-08 02:37:42 -0800282 struct inode *inode = filp->f_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 struct rpc_inode *rpci = RPC_I(inode);
284 int res;
285
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800286 mutex_lock(&inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287 res = -EPIPE;
288 if (rpci->ops != NULL)
289 res = rpci->ops->downcall(filp, buf, len);
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800290 mutex_unlock(&inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 return res;
292}
293
294static unsigned int
295rpc_pipe_poll(struct file *filp, struct poll_table_struct *wait)
296{
297 struct rpc_inode *rpci;
298 unsigned int mask = 0;
299
Josef Sipek303b46b2006-12-08 02:37:42 -0800300 rpci = RPC_I(filp->f_path.dentry->d_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301 poll_wait(filp, &rpci->waitq, wait);
302
303 mask = POLLOUT | POLLWRNORM;
304 if (rpci->ops == NULL)
305 mask |= POLLERR | POLLHUP;
J. Bruce Fieldseda4f9b2007-11-06 13:05:36 -0500306 if (filp->private_data || !list_empty(&rpci->pipe))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 mask |= POLLIN | POLLRDNORM;
308 return mask;
309}
310
Arnd Bergmanna6f8dbc2010-10-04 21:18:23 +0200311static long
312rpc_pipe_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313{
Arnd Bergmanna6f8dbc2010-10-04 21:18:23 +0200314 struct inode *inode = filp->f_path.dentry->d_inode;
315 struct rpc_inode *rpci = RPC_I(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316 int len;
317
318 switch (cmd) {
319 case FIONREAD:
Arnd Bergmanna6f8dbc2010-10-04 21:18:23 +0200320 spin_lock(&inode->i_lock);
321 if (rpci->ops == NULL) {
322 spin_unlock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323 return -EPIPE;
Arnd Bergmanna6f8dbc2010-10-04 21:18:23 +0200324 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325 len = rpci->pipelen;
326 if (filp->private_data) {
327 struct rpc_pipe_msg *msg;
Joe Perches655b5bb2010-09-04 18:52:53 -0700328 msg = filp->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329 len += msg->len - msg->copied;
330 }
Arnd Bergmanna6f8dbc2010-10-04 21:18:23 +0200331 spin_unlock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332 return put_user(len, (int __user *)arg);
333 default:
334 return -EINVAL;
335 }
336}
337
Arjan van de Venda7071d2007-02-12 00:55:36 -0800338static const struct file_operations rpc_pipe_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339 .owner = THIS_MODULE,
340 .llseek = no_llseek,
341 .read = rpc_pipe_read,
342 .write = rpc_pipe_write,
343 .poll = rpc_pipe_poll,
Frederic Weisbecker674b6042010-05-19 15:08:17 +0200344 .unlocked_ioctl = rpc_pipe_ioctl,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345 .open = rpc_pipe_open,
346 .release = rpc_pipe_release,
347};
348
349static int
350rpc_show_info(struct seq_file *m, void *v)
351{
352 struct rpc_clnt *clnt = m->private;
353
354 seq_printf(m, "RPC server: %s\n", clnt->cl_server);
355 seq_printf(m, "service: %s (%d) version %d\n", clnt->cl_protname,
356 clnt->cl_prog, clnt->cl_vers);
Chuck Levere7f78652006-08-22 20:06:19 -0400357 seq_printf(m, "address: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_ADDR));
358 seq_printf(m, "protocol: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PROTO));
J. Bruce Fieldsbf19aac2007-09-26 14:38:09 -0400359 seq_printf(m, "port: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PORT));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360 return 0;
361}
362
363static int
364rpc_info_open(struct inode *inode, struct file *file)
365{
Trond Myklebust006abe82010-09-12 19:55:25 -0400366 struct rpc_clnt *clnt = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367 int ret = single_open(file, rpc_show_info, NULL);
368
369 if (!ret) {
370 struct seq_file *m = file->private_data;
Trond Myklebust006abe82010-09-12 19:55:25 -0400371
372 spin_lock(&file->f_path.dentry->d_lock);
373 if (!d_unhashed(file->f_path.dentry))
374 clnt = RPC_I(inode)->private;
375 if (clnt != NULL && atomic_inc_not_zero(&clnt->cl_count)) {
376 spin_unlock(&file->f_path.dentry->d_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377 m->private = clnt;
378 } else {
Trond Myklebust006abe82010-09-12 19:55:25 -0400379 spin_unlock(&file->f_path.dentry->d_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380 single_release(inode, file);
381 ret = -EINVAL;
382 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383 }
384 return ret;
385}
386
387static int
388rpc_info_release(struct inode *inode, struct file *file)
389{
390 struct seq_file *m = file->private_data;
391 struct rpc_clnt *clnt = (struct rpc_clnt *)m->private;
392
393 if (clnt)
394 rpc_release_client(clnt);
395 return single_release(inode, file);
396}
397
Arjan van de Venda7071d2007-02-12 00:55:36 -0800398static const struct file_operations rpc_info_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399 .owner = THIS_MODULE,
400 .open = rpc_info_open,
401 .read = seq_read,
402 .llseek = seq_lseek,
403 .release = rpc_info_release,
404};
405
406
407/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 * Description of fs contents.
409 */
410struct rpc_filelist {
Trond Myklebustac6fece2009-08-09 15:14:20 -0400411 const char *name;
Arjan van de Ven99ac48f2006-03-28 01:56:41 -0800412 const struct file_operations *i_fop;
Trond Myklebust7364af62009-08-09 15:14:16 -0400413 umode_t mode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414};
415
Trond Myklebust54281542006-03-20 13:44:49 -0500416struct vfsmount *rpc_get_mount(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417{
Trond Myklebust54281542006-03-20 13:44:49 -0500418 int err;
419
Al Virofc14f2f2010-07-25 01:48:30 +0400420 err = simple_pin_fs(&rpc_pipe_fs_type, &rpc_mnt, &rpc_mount_count);
Trond Myklebust54281542006-03-20 13:44:49 -0500421 if (err != 0)
422 return ERR_PTR(err);
Al Virofc14f2f2010-07-25 01:48:30 +0400423 return rpc_mnt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424}
Trond Myklebuste571cbf2009-08-19 18:12:27 -0400425EXPORT_SYMBOL_GPL(rpc_get_mount);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426
Trond Myklebust54281542006-03-20 13:44:49 -0500427void rpc_put_mount(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428{
Al Virofc14f2f2010-07-25 01:48:30 +0400429 simple_release_fs(&rpc_mnt, &rpc_mount_count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430}
Trond Myklebuste571cbf2009-08-19 18:12:27 -0400431EXPORT_SYMBOL_GPL(rpc_put_mount);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432
Nick Pigginfe15ce42011-01-07 17:49:23 +1100433static int rpc_delete_dentry(const struct dentry *dentry)
Trond Myklebust62e17612007-06-08 14:14:46 -0400434{
435 return 1;
436}
437
Al Viro3ba13d12009-02-20 06:02:22 +0000438static const struct dentry_operations rpc_dentry_operations = {
Trond Myklebust62e17612007-06-08 14:14:46 -0400439 .d_delete = rpc_delete_dentry,
440};
441
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442static struct inode *
Trond Myklebust7364af62009-08-09 15:14:16 -0400443rpc_get_inode(struct super_block *sb, umode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444{
445 struct inode *inode = new_inode(sb);
446 if (!inode)
447 return NULL;
Christoph Hellwig85fe4022010-10-23 11:19:54 -0400448 inode->i_ino = get_next_ino();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449 inode->i_mode = mode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
451 switch(mode & S_IFMT) {
452 case S_IFDIR:
453 inode->i_fop = &simple_dir_operations;
454 inode->i_op = &simple_dir_inode_operations;
Dave Hansend8c76e62006-09-30 23:29:04 -0700455 inc_nlink(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 default:
457 break;
458 }
459 return inode;
460}
461
Trond Myklebust75898062009-08-09 15:14:17 -0400462static int __rpc_create_common(struct inode *dir, struct dentry *dentry,
463 umode_t mode,
464 const struct file_operations *i_fop,
465 void *private)
466{
467 struct inode *inode;
468
469 BUG_ON(!d_unhashed(dentry));
470 inode = rpc_get_inode(dir->i_sb, mode);
471 if (!inode)
472 goto out_err;
473 inode->i_ino = iunique(dir->i_sb, 100);
474 if (i_fop)
475 inode->i_fop = i_fop;
476 if (private)
477 rpc_inode_setowner(inode, private);
478 d_add(dentry, inode);
479 return 0;
480out_err:
481 printk(KERN_WARNING "%s: %s failed to allocate inode for dentry %s\n",
482 __FILE__, __func__, dentry->d_name.name);
483 dput(dentry);
484 return -ENOMEM;
485}
486
Trond Myklebustac6fece2009-08-09 15:14:20 -0400487static int __rpc_create(struct inode *dir, struct dentry *dentry,
488 umode_t mode,
489 const struct file_operations *i_fop,
490 void *private)
491{
492 int err;
493
494 err = __rpc_create_common(dir, dentry, S_IFREG | mode, i_fop, private);
495 if (err)
496 return err;
497 fsnotify_create(dir, dentry);
498 return 0;
499}
500
Trond Myklebust75898062009-08-09 15:14:17 -0400501static int __rpc_mkdir(struct inode *dir, struct dentry *dentry,
502 umode_t mode,
503 const struct file_operations *i_fop,
504 void *private)
505{
506 int err;
507
508 err = __rpc_create_common(dir, dentry, S_IFDIR | mode, i_fop, private);
509 if (err)
510 return err;
511 inc_nlink(dir);
512 fsnotify_mkdir(dir, dentry);
513 return 0;
514}
515
516static int __rpc_mkpipe(struct inode *dir, struct dentry *dentry,
517 umode_t mode,
518 const struct file_operations *i_fop,
519 void *private,
520 const struct rpc_pipe_ops *ops,
521 int flags)
522{
523 struct rpc_inode *rpci;
524 int err;
525
526 err = __rpc_create_common(dir, dentry, S_IFIFO | mode, i_fop, private);
527 if (err)
528 return err;
529 rpci = RPC_I(dentry->d_inode);
530 rpci->nkern_readwriters = 1;
531 rpci->private = private;
532 rpci->flags = flags;
533 rpci->ops = ops;
534 fsnotify_create(dir, dentry);
535 return 0;
536}
537
Trond Myklebustac6fece2009-08-09 15:14:20 -0400538static int __rpc_rmdir(struct inode *dir, struct dentry *dentry)
539{
540 int ret;
541
542 dget(dentry);
543 ret = simple_rmdir(dir, dentry);
544 d_delete(dentry);
545 dput(dentry);
546 return ret;
547}
548
Trond Myklebust810d90b2009-08-09 15:14:18 -0400549static int __rpc_unlink(struct inode *dir, struct dentry *dentry)
550{
551 int ret;
552
553 dget(dentry);
554 ret = simple_unlink(dir, dentry);
555 d_delete(dentry);
556 dput(dentry);
557 return ret;
558}
559
560static int __rpc_rmpipe(struct inode *dir, struct dentry *dentry)
561{
562 struct inode *inode = dentry->d_inode;
563 struct rpc_inode *rpci = RPC_I(inode);
564
565 rpci->nkern_readwriters--;
566 if (rpci->nkern_readwriters != 0)
567 return 0;
568 rpc_close_pipes(inode);
569 return __rpc_unlink(dir, dentry);
570}
571
Trond Myklebustcfeaa4a2009-08-09 15:14:20 -0400572static struct dentry *__rpc_lookup_create(struct dentry *parent,
573 struct qstr *name)
574{
575 struct dentry *dentry;
576
577 dentry = d_lookup(parent, name);
578 if (!dentry) {
579 dentry = d_alloc(parent, name);
580 if (!dentry) {
581 dentry = ERR_PTR(-ENOMEM);
582 goto out_err;
583 }
584 }
585 if (!dentry->d_inode)
586 dentry->d_op = &rpc_dentry_operations;
587out_err:
588 return dentry;
589}
590
591static struct dentry *__rpc_lookup_create_exclusive(struct dentry *parent,
592 struct qstr *name)
593{
594 struct dentry *dentry;
595
596 dentry = __rpc_lookup_create(parent, name);
Dan Carpenterf1f0abe2010-03-21 12:10:34 -0400597 if (IS_ERR(dentry))
598 return dentry;
Trond Myklebustcfeaa4a2009-08-09 15:14:20 -0400599 if (dentry->d_inode == NULL)
600 return dentry;
601 dput(dentry);
602 return ERR_PTR(-EEXIST);
603}
604
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605/*
606 * FIXME: This probably has races.
607 */
Trond Myklebustac6fece2009-08-09 15:14:20 -0400608static void __rpc_depopulate(struct dentry *parent,
609 const struct rpc_filelist *files,
610 int start, int eof)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611{
612 struct inode *dir = parent->d_inode;
Trond Myklebustac6fece2009-08-09 15:14:20 -0400613 struct dentry *dentry;
614 struct qstr name;
615 int i;
616
617 for (i = start; i < eof; i++) {
618 name.name = files[i].name;
619 name.len = strlen(files[i].name);
620 name.hash = full_name_hash(name.name, name.len);
621 dentry = d_lookup(parent, &name);
622
623 if (dentry == NULL)
624 continue;
625 if (dentry->d_inode == NULL)
626 goto next;
627 switch (dentry->d_inode->i_mode & S_IFMT) {
628 default:
629 BUG();
630 case S_IFREG:
631 __rpc_unlink(dir, dentry);
632 break;
633 case S_IFDIR:
634 __rpc_rmdir(dir, dentry);
635 }
636next:
637 dput(dentry);
638 }
639}
640
641static void rpc_depopulate(struct dentry *parent,
642 const struct rpc_filelist *files,
643 int start, int eof)
644{
645 struct inode *dir = parent->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646
Arjan van de Venc6573c22006-07-03 00:25:16 -0700647 mutex_lock_nested(&dir->i_mutex, I_MUTEX_CHILD);
Trond Myklebustac6fece2009-08-09 15:14:20 -0400648 __rpc_depopulate(parent, files, start, eof);
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800649 mutex_unlock(&dir->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650}
651
Trond Myklebustac6fece2009-08-09 15:14:20 -0400652static int rpc_populate(struct dentry *parent,
653 const struct rpc_filelist *files,
654 int start, int eof,
655 void *private)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656{
Trond Myklebustac6fece2009-08-09 15:14:20 -0400657 struct inode *dir = parent->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658 struct dentry *dentry;
Trond Myklebustac6fece2009-08-09 15:14:20 -0400659 int i, err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800661 mutex_lock(&dir->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662 for (i = start; i < eof; i++) {
Trond Myklebustac6fece2009-08-09 15:14:20 -0400663 struct qstr q;
664
665 q.name = files[i].name;
666 q.len = strlen(files[i].name);
667 q.hash = full_name_hash(q.name, q.len);
668 dentry = __rpc_lookup_create_exclusive(parent, &q);
669 err = PTR_ERR(dentry);
670 if (IS_ERR(dentry))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671 goto out_bad;
Trond Myklebustac6fece2009-08-09 15:14:20 -0400672 switch (files[i].mode & S_IFMT) {
673 default:
674 BUG();
675 case S_IFREG:
676 err = __rpc_create(dir, dentry,
677 files[i].mode,
678 files[i].i_fop,
679 private);
680 break;
681 case S_IFDIR:
682 err = __rpc_mkdir(dir, dentry,
683 files[i].mode,
684 NULL,
685 private);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700686 }
Trond Myklebustac6fece2009-08-09 15:14:20 -0400687 if (err != 0)
688 goto out_bad;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700689 }
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800690 mutex_unlock(&dir->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691 return 0;
692out_bad:
Trond Myklebustac6fece2009-08-09 15:14:20 -0400693 __rpc_depopulate(parent, files, start, eof);
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800694 mutex_unlock(&dir->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695 printk(KERN_WARNING "%s: %s failed to populate directory %s\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800696 __FILE__, __func__, parent->d_name.name);
Trond Myklebustac6fece2009-08-09 15:14:20 -0400697 return err;
Trond Myklebustf1345852005-09-23 11:08:25 -0400698}
Christoph Hellwig278c9952005-07-24 23:53:01 +0100699
Trond Myklebuste57aed72009-08-09 15:14:26 -0400700static struct dentry *rpc_mkdir_populate(struct dentry *parent,
701 struct qstr *name, umode_t mode, void *private,
702 int (*populate)(struct dentry *, void *), void *args_populate)
Trond Myklebustf1345852005-09-23 11:08:25 -0400703{
Trond Myklebustf1345852005-09-23 11:08:25 -0400704 struct dentry *dentry;
Trond Myklebust7d59d1e2009-08-09 15:14:23 -0400705 struct inode *dir = parent->d_inode;
Trond Myklebustf1345852005-09-23 11:08:25 -0400706 int error;
707
Trond Myklebust7d59d1e2009-08-09 15:14:23 -0400708 mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
709 dentry = __rpc_lookup_create_exclusive(parent, name);
Trond Myklebustf1345852005-09-23 11:08:25 -0400710 if (IS_ERR(dentry))
Trond Myklebust7d59d1e2009-08-09 15:14:23 -0400711 goto out;
712 error = __rpc_mkdir(dir, dentry, mode, NULL, private);
Trond Myklebust75898062009-08-09 15:14:17 -0400713 if (error != 0)
714 goto out_err;
Trond Myklebuste57aed72009-08-09 15:14:26 -0400715 if (populate != NULL) {
716 error = populate(dentry, args_populate);
717 if (error)
718 goto err_rmdir;
719 }
Trond Myklebustf1345852005-09-23 11:08:25 -0400720out:
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800721 mutex_unlock(&dir->i_mutex);
Trond Myklebust5c3e9852006-07-29 17:37:40 -0400722 return dentry;
Trond Myklebustac6fece2009-08-09 15:14:20 -0400723err_rmdir:
Trond Myklebustf1345852005-09-23 11:08:25 -0400724 __rpc_rmdir(dir, dentry);
Trond Myklebust75898062009-08-09 15:14:17 -0400725out_err:
Trond Myklebustf1345852005-09-23 11:08:25 -0400726 dentry = ERR_PTR(error);
727 goto out;
728}
729
Trond Myklebuste57aed72009-08-09 15:14:26 -0400730static int rpc_rmdir_depopulate(struct dentry *dentry,
731 void (*depopulate)(struct dentry *))
Trond Myklebustf1345852005-09-23 11:08:25 -0400732{
Trond Myklebustdff02cc2006-07-31 14:17:18 -0700733 struct dentry *parent;
Trond Myklebustf1345852005-09-23 11:08:25 -0400734 struct inode *dir;
735 int error;
736
Trond Myklebustdff02cc2006-07-31 14:17:18 -0700737 parent = dget_parent(dentry);
738 dir = parent->d_inode;
Arjan van de Venc6573c22006-07-03 00:25:16 -0700739 mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
Trond Myklebuste57aed72009-08-09 15:14:26 -0400740 if (depopulate != NULL)
741 depopulate(dentry);
Trond Myklebustf1345852005-09-23 11:08:25 -0400742 error = __rpc_rmdir(dir, dentry);
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800743 mutex_unlock(&dir->i_mutex);
Trond Myklebustdff02cc2006-07-31 14:17:18 -0700744 dput(parent);
Trond Myklebustf1345852005-09-23 11:08:25 -0400745 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746}
747
J. Bruce Fields93a44a72007-11-06 13:06:03 -0500748/**
749 * rpc_mkpipe - make an rpc_pipefs file for kernel<->userspace communication
750 * @parent: dentry of directory to create new "pipe" in
751 * @name: name of pipe
752 * @private: private data to associate with the pipe, for the caller's use
753 * @ops: operations defining the behavior of the pipe: upcall, downcall,
\"J. Bruce Fields\c3810602008-12-23 16:08:32 -0500754 * release_pipe, open_pipe, and destroy_msg.
Randy Dunlap65b6e422008-02-13 15:03:23 -0800755 * @flags: rpc_inode flags
J. Bruce Fields93a44a72007-11-06 13:06:03 -0500756 *
757 * Data is made available for userspace to read by calls to
758 * rpc_queue_upcall(). The actual reads will result in calls to
759 * @ops->upcall, which will be called with the file pointer,
760 * message, and userspace buffer to copy to.
761 *
762 * Writes can come at any time, and do not necessarily have to be
763 * responses to upcalls. They will result in calls to @msg->downcall.
764 *
765 * The @private argument passed here will be available to all these methods
766 * from the file pointer, via RPC_I(file->f_dentry->d_inode)->private.
767 */
Trond Myklebustb693ba42009-08-09 15:14:15 -0400768struct dentry *rpc_mkpipe(struct dentry *parent, const char *name,
769 void *private, const struct rpc_pipe_ops *ops,
770 int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772 struct dentry *dentry;
Trond Myklebust75898062009-08-09 15:14:17 -0400773 struct inode *dir = parent->d_inode;
Trond Myklebust7364af62009-08-09 15:14:16 -0400774 umode_t umode = S_IFIFO | S_IRUSR | S_IWUSR;
Trond Myklebustcfeaa4a2009-08-09 15:14:20 -0400775 struct qstr q;
Trond Myklebust75898062009-08-09 15:14:17 -0400776 int err;
Trond Myklebust7364af62009-08-09 15:14:16 -0400777
778 if (ops->upcall == NULL)
779 umode &= ~S_IRUGO;
780 if (ops->downcall == NULL)
781 umode &= ~S_IWUGO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782
Trond Myklebustcfeaa4a2009-08-09 15:14:20 -0400783 q.name = name;
784 q.len = strlen(name);
785 q.hash = full_name_hash(q.name, q.len),
786
787 mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
788 dentry = __rpc_lookup_create(parent, &q);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789 if (IS_ERR(dentry))
Trond Myklebustcfeaa4a2009-08-09 15:14:20 -0400790 goto out;
Trond Myklebust34f30892007-06-07 18:28:02 -0400791 if (dentry->d_inode) {
Trond Myklebust75898062009-08-09 15:14:17 -0400792 struct rpc_inode *rpci = RPC_I(dentry->d_inode);
Trond Myklebust34f30892007-06-07 18:28:02 -0400793 if (rpci->private != private ||
794 rpci->ops != ops ||
795 rpci->flags != flags) {
796 dput (dentry);
Trond Myklebust810d90b2009-08-09 15:14:18 -0400797 err = -EBUSY;
798 goto out_err;
Trond Myklebust34f30892007-06-07 18:28:02 -0400799 }
Trond Myklebust03a12562007-06-08 14:14:53 -0400800 rpci->nkern_readwriters++;
Trond Myklebust34f30892007-06-07 18:28:02 -0400801 goto out;
802 }
Trond Myklebust75898062009-08-09 15:14:17 -0400803
804 err = __rpc_mkpipe(dir, dentry, umode, &rpc_pipe_fops,
Trond Myklebust810d90b2009-08-09 15:14:18 -0400805 private, ops, flags);
Trond Myklebust75898062009-08-09 15:14:17 -0400806 if (err)
807 goto out_err;
Trond Myklebustf1345852005-09-23 11:08:25 -0400808out:
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800809 mutex_unlock(&dir->i_mutex);
Trond Myklebust5c3e9852006-07-29 17:37:40 -0400810 return dentry;
Trond Myklebust75898062009-08-09 15:14:17 -0400811out_err:
812 dentry = ERR_PTR(err);
Trond Myklebust158998b2006-08-24 01:03:17 -0400813 printk(KERN_WARNING "%s: %s() failed to create pipe %s/%s (errno = %d)\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800814 __FILE__, __func__, parent->d_name.name, name,
Trond Myklebust75898062009-08-09 15:14:17 -0400815 err);
Trond Myklebustf1345852005-09-23 11:08:25 -0400816 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817}
Trond Myklebust468039e2008-12-23 15:21:31 -0500818EXPORT_SYMBOL_GPL(rpc_mkpipe);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819
J. Bruce Fields93a44a72007-11-06 13:06:03 -0500820/**
821 * rpc_unlink - remove a pipe
822 * @dentry: dentry for the pipe, as returned from rpc_mkpipe
823 *
824 * After this call, lookups will no longer find the pipe, and any
825 * attempts to read or write using preexisting opens of the pipe will
826 * return -EPIPE.
827 */
Trond Myklebustf1345852005-09-23 11:08:25 -0400828int
Trond Myklebust5d674762006-07-31 14:11:48 -0700829rpc_unlink(struct dentry *dentry)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830{
Trond Myklebust5d674762006-07-31 14:11:48 -0700831 struct dentry *parent;
Trond Myklebustf1345852005-09-23 11:08:25 -0400832 struct inode *dir;
Trond Myklebust5d674762006-07-31 14:11:48 -0700833 int error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700834
Trond Myklebust5d674762006-07-31 14:11:48 -0700835 parent = dget_parent(dentry);
836 dir = parent->d_inode;
Arjan van de Venc6573c22006-07-03 00:25:16 -0700837 mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
Trond Myklebust810d90b2009-08-09 15:14:18 -0400838 error = __rpc_rmpipe(dir, dentry);
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800839 mutex_unlock(&dir->i_mutex);
Trond Myklebust5d674762006-07-31 14:11:48 -0700840 dput(parent);
Trond Myklebustf1345852005-09-23 11:08:25 -0400841 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842}
Trond Myklebust468039e2008-12-23 15:21:31 -0500843EXPORT_SYMBOL_GPL(rpc_unlink);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700844
Trond Myklebuste57aed72009-08-09 15:14:26 -0400845enum {
846 RPCAUTH_info,
847 RPCAUTH_EOF
848};
849
850static const struct rpc_filelist authfiles[] = {
851 [RPCAUTH_info] = {
852 .name = "info",
853 .i_fop = &rpc_info_operations,
854 .mode = S_IFREG | S_IRUSR,
855 },
856};
857
858static int rpc_clntdir_populate(struct dentry *dentry, void *private)
859{
860 return rpc_populate(dentry,
861 authfiles, RPCAUTH_info, RPCAUTH_EOF,
862 private);
863}
864
865static void rpc_clntdir_depopulate(struct dentry *dentry)
866{
867 rpc_depopulate(dentry, authfiles, RPCAUTH_info, RPCAUTH_EOF);
868}
869
Trond Myklebust7d59d1e2009-08-09 15:14:23 -0400870/**
871 * rpc_create_client_dir - Create a new rpc_client directory in rpc_pipefs
Randy Dunlap4111d4f2009-09-23 14:36:38 -0400872 * @dentry: dentry from the rpc_pipefs root to the new directory
873 * @name: &struct qstr for the name
Trond Myklebust7d59d1e2009-08-09 15:14:23 -0400874 * @rpc_client: rpc client to associate with this directory
875 *
876 * This creates a directory at the given @path associated with
877 * @rpc_clnt, which will contain a file named "info" with some basic
878 * information about the client, together with any "pipes" that may
879 * later be created using rpc_mkpipe().
880 */
Trond Myklebust23ac6582009-08-09 15:14:25 -0400881struct dentry *rpc_create_client_dir(struct dentry *dentry,
Trond Myklebuste57aed72009-08-09 15:14:26 -0400882 struct qstr *name,
883 struct rpc_clnt *rpc_client)
Trond Myklebust7d59d1e2009-08-09 15:14:23 -0400884{
Trond Myklebuste57aed72009-08-09 15:14:26 -0400885 return rpc_mkdir_populate(dentry, name, S_IRUGO | S_IXUGO, NULL,
886 rpc_clntdir_populate, rpc_client);
887}
888
889/**
890 * rpc_remove_client_dir - Remove a directory created with rpc_create_client_dir()
891 * @dentry: directory to remove
892 */
893int rpc_remove_client_dir(struct dentry *dentry)
894{
895 return rpc_rmdir_depopulate(dentry, rpc_clntdir_depopulate);
Trond Myklebust7d59d1e2009-08-09 15:14:23 -0400896}
897
Trond Myklebust8854e822009-08-09 15:14:30 -0400898static const struct rpc_filelist cache_pipefs_files[3] = {
899 [0] = {
900 .name = "channel",
901 .i_fop = &cache_file_operations_pipefs,
Trond Myklebust96c61cb2009-08-19 18:12:21 -0400902 .mode = S_IFREG|S_IRUSR|S_IWUSR,
Trond Myklebust8854e822009-08-09 15:14:30 -0400903 },
904 [1] = {
905 .name = "content",
906 .i_fop = &content_file_operations_pipefs,
907 .mode = S_IFREG|S_IRUSR,
908 },
909 [2] = {
910 .name = "flush",
911 .i_fop = &cache_flush_operations_pipefs,
912 .mode = S_IFREG|S_IRUSR|S_IWUSR,
913 },
914};
915
916static int rpc_cachedir_populate(struct dentry *dentry, void *private)
917{
918 return rpc_populate(dentry,
919 cache_pipefs_files, 0, 3,
920 private);
921}
922
923static void rpc_cachedir_depopulate(struct dentry *dentry)
924{
925 rpc_depopulate(dentry, cache_pipefs_files, 0, 3);
926}
927
928struct dentry *rpc_create_cache_dir(struct dentry *parent, struct qstr *name,
929 mode_t umode, struct cache_detail *cd)
930{
931 return rpc_mkdir_populate(parent, name, umode, NULL,
932 rpc_cachedir_populate, cd);
933}
934
935void rpc_remove_cache_dir(struct dentry *dentry)
936{
937 rpc_rmdir_depopulate(dentry, rpc_cachedir_depopulate);
938}
939
Linus Torvalds1da177e2005-04-16 15:20:36 -0700940/*
941 * populate the filesystem
942 */
Alexey Dobriyanb87221d2009-09-21 17:01:09 -0700943static const struct super_operations s_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700944 .alloc_inode = rpc_alloc_inode,
945 .destroy_inode = rpc_destroy_inode,
946 .statfs = simple_statfs,
947};
948
949#define RPCAUTH_GSSMAGIC 0x67596969
950
Trond Myklebustbb156742009-08-09 15:14:21 -0400951/*
952 * We have a single directory with 1 node in it.
953 */
954enum {
955 RPCAUTH_lockd,
956 RPCAUTH_mount,
957 RPCAUTH_nfs,
958 RPCAUTH_portmap,
959 RPCAUTH_statd,
960 RPCAUTH_nfsd4_cb,
Trond Myklebuste571cbf2009-08-19 18:12:27 -0400961 RPCAUTH_cache,
Trond Myklebustbb156742009-08-09 15:14:21 -0400962 RPCAUTH_RootEOF
963};
964
965static const struct rpc_filelist files[] = {
966 [RPCAUTH_lockd] = {
967 .name = "lockd",
968 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
969 },
970 [RPCAUTH_mount] = {
971 .name = "mount",
972 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
973 },
974 [RPCAUTH_nfs] = {
975 .name = "nfs",
976 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
977 },
978 [RPCAUTH_portmap] = {
979 .name = "portmap",
980 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
981 },
982 [RPCAUTH_statd] = {
983 .name = "statd",
984 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
985 },
986 [RPCAUTH_nfsd4_cb] = {
987 .name = "nfsd4_cb",
988 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
989 },
Trond Myklebuste571cbf2009-08-19 18:12:27 -0400990 [RPCAUTH_cache] = {
991 .name = "cache",
992 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
993 },
Trond Myklebustbb156742009-08-09 15:14:21 -0400994};
995
Linus Torvalds1da177e2005-04-16 15:20:36 -0700996static int
997rpc_fill_super(struct super_block *sb, void *data, int silent)
998{
999 struct inode *inode;
1000 struct dentry *root;
1001
1002 sb->s_blocksize = PAGE_CACHE_SIZE;
1003 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
1004 sb->s_magic = RPCAUTH_GSSMAGIC;
1005 sb->s_op = &s_ops;
1006 sb->s_time_gran = 1;
1007
1008 inode = rpc_get_inode(sb, S_IFDIR | 0755);
1009 if (!inode)
1010 return -ENOMEM;
Al Virofc7bed82010-01-25 18:30:38 -05001011 sb->s_root = root = d_alloc_root(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012 if (!root) {
1013 iput(inode);
1014 return -ENOMEM;
1015 }
Trond Myklebustac6fece2009-08-09 15:14:20 -04001016 if (rpc_populate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF, NULL))
Al Virofc7bed82010-01-25 18:30:38 -05001017 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001018 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001019}
1020
Al Virofc14f2f2010-07-25 01:48:30 +04001021static struct dentry *
1022rpc_mount(struct file_system_type *fs_type,
1023 int flags, const char *dev_name, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001024{
Al Virofc14f2f2010-07-25 01:48:30 +04001025 return mount_single(fs_type, flags, data, rpc_fill_super);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001026}
1027
1028static struct file_system_type rpc_pipe_fs_type = {
1029 .owner = THIS_MODULE,
1030 .name = "rpc_pipefs",
Al Virofc14f2f2010-07-25 01:48:30 +04001031 .mount = rpc_mount,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001032 .kill_sb = kill_litter_super,
1033};
1034
1035static void
Alexey Dobriyan51cc5062008-07-25 19:45:34 -07001036init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001037{
1038 struct rpc_inode *rpci = (struct rpc_inode *) foo;
1039
Christoph Lametera35afb82007-05-16 22:10:57 -07001040 inode_init_once(&rpci->vfs_inode);
1041 rpci->private = NULL;
1042 rpci->nreaders = 0;
1043 rpci->nwriters = 0;
1044 INIT_LIST_HEAD(&rpci->in_upcall);
Trond Myklebust6e84c7b2007-06-07 15:31:36 -04001045 INIT_LIST_HEAD(&rpci->in_downcall);
Christoph Lametera35afb82007-05-16 22:10:57 -07001046 INIT_LIST_HEAD(&rpci->pipe);
1047 rpci->pipelen = 0;
1048 init_waitqueue_head(&rpci->waitq);
1049 INIT_DELAYED_WORK(&rpci->queue_timeout,
1050 rpc_timeout_upcall_queue);
1051 rpci->ops = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001052}
1053
1054int register_rpc_pipefs(void)
1055{
Akinobu Mita5bd5f582007-05-09 02:34:51 -07001056 int err;
1057
Linus Torvalds1da177e2005-04-16 15:20:36 -07001058 rpc_inode_cachep = kmem_cache_create("rpc_inode_cache",
Paul Jacksonfffb60f2006-03-24 03:16:06 -08001059 sizeof(struct rpc_inode),
1060 0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1061 SLAB_MEM_SPREAD),
Paul Mundt20c2df82007-07-20 10:11:58 +09001062 init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001063 if (!rpc_inode_cachep)
1064 return -ENOMEM;
Akinobu Mita5bd5f582007-05-09 02:34:51 -07001065 err = register_filesystem(&rpc_pipe_fs_type);
1066 if (err) {
1067 kmem_cache_destroy(rpc_inode_cachep);
1068 return err;
1069 }
1070
Linus Torvalds1da177e2005-04-16 15:20:36 -07001071 return 0;
1072}
1073
1074void unregister_rpc_pipefs(void)
1075{
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -07001076 kmem_cache_destroy(rpc_inode_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077 unregister_filesystem(&rpc_pipe_fs_type);
1078}