blob: d8c78150e9caa6adf2983866781bb88d3aad9f4a [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 Myklebustb693ba42009-08-09 15:14:15 -0400128 const 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;
Trond Myklebust7364af62009-08-09 15:14:16 -0400420 umode_t mode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421};
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 Myklebustb5bb61d2009-08-09 15:14:17 -0400487static int __rpc_lookup_path(const char *pathname, unsigned flags,
488 struct nameidata *nd)
Trond Myklebustf1345852005-09-23 11:08:25 -0400489{
Josef 'Jeff' Sipek4ac4efc2007-07-19 01:48:20 -0700490 struct vfsmount *mnt;
491
Trond Myklebustb5bb61d2009-08-09 15:14:17 -0400492 if (pathname[0] == '\0')
Trond Myklebustf1345852005-09-23 11:08:25 -0400493 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
Trond Myklebustb5bb61d2009-08-09 15:14:17 -0400502 if (vfs_path_lookup(mnt->mnt_root, mnt, pathname, flags, nd)) {
Trond Myklebustf1345852005-09-23 11:08:25 -0400503 printk(KERN_WARNING "%s: %s failed to find path %s\n",
Trond Myklebustb5bb61d2009-08-09 15:14:17 -0400504 __FILE__, __func__, pathname);
Trond Myklebustf1345852005-09-23 11:08:25 -0400505 rpc_put_mount();
506 return -ENOENT;
507 }
508 return 0;
509}
510
Trond Myklebustb5bb61d2009-08-09 15:14:17 -0400511static int rpc_lookup_parent(const char *pathname, struct nameidata *nd)
512{
513 return __rpc_lookup_path(pathname, LOOKUP_PARENT, nd);
514}
515
Trond Myklebustf1345852005-09-23 11:08:25 -0400516static void
517rpc_release_path(struct nameidata *nd)
518{
Jan Blunck1d957f92008-02-14 19:34:35 -0800519 path_put(&nd->path);
Trond Myklebustf1345852005-09-23 11:08:25 -0400520 rpc_put_mount();
521}
522
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523static struct inode *
Trond Myklebust7364af62009-08-09 15:14:16 -0400524rpc_get_inode(struct super_block *sb, umode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525{
526 struct inode *inode = new_inode(sb);
527 if (!inode)
528 return NULL;
529 inode->i_mode = mode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
531 switch(mode & S_IFMT) {
532 case S_IFDIR:
533 inode->i_fop = &simple_dir_operations;
534 inode->i_op = &simple_dir_inode_operations;
Dave Hansend8c76e62006-09-30 23:29:04 -0700535 inc_nlink(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536 default:
537 break;
538 }
539 return inode;
540}
541
Trond Myklebust75898062009-08-09 15:14:17 -0400542static int __rpc_create_common(struct inode *dir, struct dentry *dentry,
543 umode_t mode,
544 const struct file_operations *i_fop,
545 void *private)
546{
547 struct inode *inode;
548
549 BUG_ON(!d_unhashed(dentry));
550 inode = rpc_get_inode(dir->i_sb, mode);
551 if (!inode)
552 goto out_err;
553 inode->i_ino = iunique(dir->i_sb, 100);
554 if (i_fop)
555 inode->i_fop = i_fop;
556 if (private)
557 rpc_inode_setowner(inode, private);
558 d_add(dentry, inode);
559 return 0;
560out_err:
561 printk(KERN_WARNING "%s: %s failed to allocate inode for dentry %s\n",
562 __FILE__, __func__, dentry->d_name.name);
563 dput(dentry);
564 return -ENOMEM;
565}
566
567static int __rpc_mkdir(struct inode *dir, struct dentry *dentry,
568 umode_t mode,
569 const struct file_operations *i_fop,
570 void *private)
571{
572 int err;
573
574 err = __rpc_create_common(dir, dentry, S_IFDIR | mode, i_fop, private);
575 if (err)
576 return err;
577 inc_nlink(dir);
578 fsnotify_mkdir(dir, dentry);
579 return 0;
580}
581
582static int __rpc_mkpipe(struct inode *dir, struct dentry *dentry,
583 umode_t mode,
584 const struct file_operations *i_fop,
585 void *private,
586 const struct rpc_pipe_ops *ops,
587 int flags)
588{
589 struct rpc_inode *rpci;
590 int err;
591
592 err = __rpc_create_common(dir, dentry, S_IFIFO | mode, i_fop, private);
593 if (err)
594 return err;
595 rpci = RPC_I(dentry->d_inode);
596 rpci->nkern_readwriters = 1;
597 rpci->private = private;
598 rpci->flags = flags;
599 rpci->ops = ops;
600 fsnotify_create(dir, dentry);
601 return 0;
602}
603
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604/*
605 * FIXME: This probably has races.
606 */
Chuck Lever9b45b742007-10-26 13:31:04 -0400607static void rpc_depopulate(struct dentry *parent,
608 unsigned long start, unsigned long eof)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609{
610 struct inode *dir = parent->d_inode;
611 struct list_head *pos, *next;
612 struct dentry *dentry, *dvec[10];
613 int n = 0;
614
Arjan van de Venc6573c22006-07-03 00:25:16 -0700615 mutex_lock_nested(&dir->i_mutex, I_MUTEX_CHILD);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616repeat:
617 spin_lock(&dcache_lock);
618 list_for_each_safe(pos, next, &parent->d_subdirs) {
Eric Dumazet5160ee62006-01-08 01:03:32 -0800619 dentry = list_entry(pos, struct dentry, d_u.d_child);
Trond Myklebust62e17612007-06-08 14:14:46 -0400620 if (!dentry->d_inode ||
621 dentry->d_inode->i_ino < start ||
622 dentry->d_inode->i_ino >= eof)
623 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624 spin_lock(&dentry->d_lock);
625 if (!d_unhashed(dentry)) {
626 dget_locked(dentry);
627 __d_drop(dentry);
628 spin_unlock(&dentry->d_lock);
629 dvec[n++] = dentry;
630 if (n == ARRAY_SIZE(dvec))
631 break;
632 } else
633 spin_unlock(&dentry->d_lock);
634 }
635 spin_unlock(&dcache_lock);
636 if (n) {
637 do {
638 dentry = dvec[--n];
Trond Myklebust62e17612007-06-08 14:14:46 -0400639 if (S_ISREG(dentry->d_inode->i_mode))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640 simple_unlink(dir, dentry);
Trond Myklebust62e17612007-06-08 14:14:46 -0400641 else if (S_ISDIR(dentry->d_inode->i_mode))
642 simple_rmdir(dir, dentry);
643 d_delete(dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644 dput(dentry);
645 } while (n);
646 goto repeat;
647 }
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800648 mutex_unlock(&dir->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649}
650
651static int
652rpc_populate(struct dentry *parent,
653 struct rpc_filelist *files,
654 int start, int eof)
655{
656 struct inode *inode, *dir = parent->d_inode;
657 void *private = RPC_I(dir)->private;
658 struct dentry *dentry;
Trond Myklebust7364af62009-08-09 15:14:16 -0400659 umode_t mode;
660 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800662 mutex_lock(&dir->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663 for (i = start; i < eof; i++) {
664 dentry = d_alloc_name(parent, files[i].name);
665 if (!dentry)
666 goto out_bad;
Trond Myklebust62e17612007-06-08 14:14:46 -0400667 dentry->d_op = &rpc_dentry_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668 mode = files[i].mode;
669 inode = rpc_get_inode(dir->i_sb, mode);
670 if (!inode) {
671 dput(dentry);
672 goto out_bad;
673 }
674 inode->i_ino = i;
675 if (files[i].i_fop)
676 inode->i_fop = files[i].i_fop;
677 if (private)
678 rpc_inode_setowner(inode, private);
679 if (S_ISDIR(mode))
Dave Hansend8c76e62006-09-30 23:29:04 -0700680 inc_nlink(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681 d_add(dentry, inode);
Trond Myklebust50e437d2007-06-07 22:44:34 -0400682 fsnotify_create(dir, dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683 }
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800684 mutex_unlock(&dir->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685 return 0;
686out_bad:
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800687 mutex_unlock(&dir->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688 printk(KERN_WARNING "%s: %s failed to populate directory %s\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800689 __FILE__, __func__, parent->d_name.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690 return -ENOMEM;
691}
692
Trond Myklebustf1345852005-09-23 11:08:25 -0400693static int
Trond Myklebustf1345852005-09-23 11:08:25 -0400694__rpc_rmdir(struct inode *dir, struct dentry *dentry)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695{
Trond Myklebustf1345852005-09-23 11:08:25 -0400696 int error;
Trond Myklebust62e17612007-06-08 14:14:46 -0400697 error = simple_rmdir(dir, dentry);
698 if (!error)
699 d_delete(dentry);
700 return error;
Trond Myklebustf1345852005-09-23 11:08:25 -0400701}
Christoph Hellwig278c9952005-07-24 23:53:01 +0100702
Trond Myklebustf1345852005-09-23 11:08:25 -0400703static struct dentry *
Trond Myklebust34f30892007-06-07 18:28:02 -0400704rpc_lookup_create(struct dentry *parent, const char *name, int len, int exclusive)
Trond Myklebustf1345852005-09-23 11:08:25 -0400705{
Trond Myklebust158998b2006-08-24 01:03:17 -0400706 struct inode *dir = parent->d_inode;
Trond Myklebustf1345852005-09-23 11:08:25 -0400707 struct dentry *dentry;
Trond Myklebustf1345852005-09-23 11:08:25 -0400708
Arjan van de Venc6573c22006-07-03 00:25:16 -0700709 mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
Trond Myklebust158998b2006-08-24 01:03:17 -0400710 dentry = lookup_one_len(name, parent, len);
Trond Myklebustf1345852005-09-23 11:08:25 -0400711 if (IS_ERR(dentry))
712 goto out_err;
Trond Myklebust62e17612007-06-08 14:14:46 -0400713 if (!dentry->d_inode)
714 dentry->d_op = &rpc_dentry_operations;
715 else if (exclusive) {
Trond Myklebustf1345852005-09-23 11:08:25 -0400716 dput(dentry);
717 dentry = ERR_PTR(-EEXIST);
718 goto out_err;
719 }
720 return dentry;
721out_err:
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800722 mutex_unlock(&dir->i_mutex);
Trond Myklebust158998b2006-08-24 01:03:17 -0400723 return dentry;
724}
725
726static struct dentry *
727rpc_lookup_negative(char *path, struct nameidata *nd)
728{
729 struct dentry *dentry;
730 int error;
731
732 if ((error = rpc_lookup_parent(path, nd)) != 0)
733 return ERR_PTR(error);
Jan Blunck4ac91372008-02-14 19:34:32 -0800734 dentry = rpc_lookup_create(nd->path.dentry, nd->last.name, nd->last.len,
735 1);
Trond Myklebust158998b2006-08-24 01:03:17 -0400736 if (IS_ERR(dentry))
737 rpc_release_path(nd);
Trond Myklebustf1345852005-09-23 11:08:25 -0400738 return dentry;
739}
740
J. Bruce Fields93a44a72007-11-06 13:06:03 -0500741/**
742 * rpc_mkdir - Create a new directory in rpc_pipefs
743 * @path: path from the rpc_pipefs root to the new directory
Randy Dunlap65b6e422008-02-13 15:03:23 -0800744 * @rpc_client: rpc client to associate with this directory
J. Bruce Fields93a44a72007-11-06 13:06:03 -0500745 *
746 * This creates a directory at the given @path associated with
747 * @rpc_clnt, which will contain a file named "info" with some basic
748 * information about the client, together with any "pipes" that may
749 * later be created using rpc_mkpipe().
750 */
Trond Myklebustf1345852005-09-23 11:08:25 -0400751struct dentry *
752rpc_mkdir(char *path, struct rpc_clnt *rpc_client)
753{
754 struct nameidata nd;
755 struct dentry *dentry;
756 struct inode *dir;
757 int error;
758
759 dentry = rpc_lookup_negative(path, &nd);
760 if (IS_ERR(dentry))
761 return dentry;
Jan Blunck4ac91372008-02-14 19:34:32 -0800762 dir = nd.path.dentry->d_inode;
Trond Myklebust75898062009-08-09 15:14:17 -0400763 error = __rpc_mkdir(dir, dentry, S_IRUGO | S_IXUGO, NULL, rpc_client);
764 if (error != 0)
765 goto out_err;
Trond Myklebustf1345852005-09-23 11:08:25 -0400766 error = rpc_populate(dentry, authfiles,
767 RPCAUTH_info, RPCAUTH_EOF);
768 if (error)
769 goto err_depopulate;
Trond Myklebust5c3e9852006-07-29 17:37:40 -0400770 dget(dentry);
Trond Myklebustf1345852005-09-23 11:08:25 -0400771out:
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800772 mutex_unlock(&dir->i_mutex);
Trond Myklebustf1345852005-09-23 11:08:25 -0400773 rpc_release_path(&nd);
Trond Myklebust5c3e9852006-07-29 17:37:40 -0400774 return dentry;
Trond Myklebustf1345852005-09-23 11:08:25 -0400775err_depopulate:
Trond Myklebust62e17612007-06-08 14:14:46 -0400776 rpc_depopulate(dentry, RPCAUTH_info, RPCAUTH_EOF);
Trond Myklebustf1345852005-09-23 11:08:25 -0400777 __rpc_rmdir(dir, dentry);
Trond Myklebust75898062009-08-09 15:14:17 -0400778out_err:
Trond Myklebustf1345852005-09-23 11:08:25 -0400779 printk(KERN_WARNING "%s: %s() failed to create directory %s (errno = %d)\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800780 __FILE__, __func__, path, error);
Trond Myklebustf1345852005-09-23 11:08:25 -0400781 dentry = ERR_PTR(error);
782 goto out;
783}
784
J. Bruce Fields93a44a72007-11-06 13:06:03 -0500785/**
786 * rpc_rmdir - Remove a directory created with rpc_mkdir()
787 * @dentry: directory to remove
788 */
Trond Myklebustf1345852005-09-23 11:08:25 -0400789int
Trond Myklebustdff02cc2006-07-31 14:17:18 -0700790rpc_rmdir(struct dentry *dentry)
Trond Myklebustf1345852005-09-23 11:08:25 -0400791{
Trond Myklebustdff02cc2006-07-31 14:17:18 -0700792 struct dentry *parent;
Trond Myklebustf1345852005-09-23 11:08:25 -0400793 struct inode *dir;
794 int error;
795
Trond Myklebustdff02cc2006-07-31 14:17:18 -0700796 parent = dget_parent(dentry);
797 dir = parent->d_inode;
Arjan van de Venc6573c22006-07-03 00:25:16 -0700798 mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
Trond Myklebust62e17612007-06-08 14:14:46 -0400799 rpc_depopulate(dentry, RPCAUTH_info, RPCAUTH_EOF);
Trond Myklebustf1345852005-09-23 11:08:25 -0400800 error = __rpc_rmdir(dir, dentry);
801 dput(dentry);
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800802 mutex_unlock(&dir->i_mutex);
Trond Myklebustdff02cc2006-07-31 14:17:18 -0700803 dput(parent);
Trond Myklebustf1345852005-09-23 11:08:25 -0400804 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805}
806
J. Bruce Fields93a44a72007-11-06 13:06:03 -0500807/**
808 * rpc_mkpipe - make an rpc_pipefs file for kernel<->userspace communication
809 * @parent: dentry of directory to create new "pipe" in
810 * @name: name of pipe
811 * @private: private data to associate with the pipe, for the caller's use
812 * @ops: operations defining the behavior of the pipe: upcall, downcall,
\"J. Bruce Fields\c3810602008-12-23 16:08:32 -0500813 * release_pipe, open_pipe, and destroy_msg.
Randy Dunlap65b6e422008-02-13 15:03:23 -0800814 * @flags: rpc_inode flags
J. Bruce Fields93a44a72007-11-06 13:06:03 -0500815 *
816 * Data is made available for userspace to read by calls to
817 * rpc_queue_upcall(). The actual reads will result in calls to
818 * @ops->upcall, which will be called with the file pointer,
819 * message, and userspace buffer to copy to.
820 *
821 * Writes can come at any time, and do not necessarily have to be
822 * responses to upcalls. They will result in calls to @msg->downcall.
823 *
824 * The @private argument passed here will be available to all these methods
825 * from the file pointer, via RPC_I(file->f_dentry->d_inode)->private.
826 */
Trond Myklebustb693ba42009-08-09 15:14:15 -0400827struct dentry *rpc_mkpipe(struct dentry *parent, const char *name,
828 void *private, const struct rpc_pipe_ops *ops,
829 int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700831 struct dentry *dentry;
Trond Myklebust75898062009-08-09 15:14:17 -0400832 struct inode *dir = parent->d_inode;
Trond Myklebust7364af62009-08-09 15:14:16 -0400833 umode_t umode = S_IFIFO | S_IRUSR | S_IWUSR;
Trond Myklebust75898062009-08-09 15:14:17 -0400834 int err;
Trond Myklebust7364af62009-08-09 15:14:16 -0400835
836 if (ops->upcall == NULL)
837 umode &= ~S_IRUGO;
838 if (ops->downcall == NULL)
839 umode &= ~S_IWUGO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700840
Trond Myklebust34f30892007-06-07 18:28:02 -0400841 dentry = rpc_lookup_create(parent, name, strlen(name), 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842 if (IS_ERR(dentry))
Trond Myklebustf1345852005-09-23 11:08:25 -0400843 return dentry;
Trond Myklebust158998b2006-08-24 01:03:17 -0400844 dir = parent->d_inode;
Trond Myklebust34f30892007-06-07 18:28:02 -0400845 if (dentry->d_inode) {
Trond Myklebust75898062009-08-09 15:14:17 -0400846 struct rpc_inode *rpci = RPC_I(dentry->d_inode);
Trond Myklebust34f30892007-06-07 18:28:02 -0400847 if (rpci->private != private ||
848 rpci->ops != ops ||
849 rpci->flags != flags) {
850 dput (dentry);
851 dentry = ERR_PTR(-EBUSY);
852 }
Trond Myklebust03a12562007-06-08 14:14:53 -0400853 rpci->nkern_readwriters++;
Trond Myklebust34f30892007-06-07 18:28:02 -0400854 goto out;
855 }
Trond Myklebust75898062009-08-09 15:14:17 -0400856
857 err = __rpc_mkpipe(dir, dentry, umode, &rpc_pipe_fops,
858 private, ops, flags);
859 if (err)
860 goto out_err;
Trond Myklebust5c3e9852006-07-29 17:37:40 -0400861 dget(dentry);
Trond Myklebustf1345852005-09-23 11:08:25 -0400862out:
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800863 mutex_unlock(&dir->i_mutex);
Trond Myklebust5c3e9852006-07-29 17:37:40 -0400864 return dentry;
Trond Myklebust75898062009-08-09 15:14:17 -0400865out_err:
866 dentry = ERR_PTR(err);
Trond Myklebust158998b2006-08-24 01:03:17 -0400867 printk(KERN_WARNING "%s: %s() failed to create pipe %s/%s (errno = %d)\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800868 __FILE__, __func__, parent->d_name.name, name,
Trond Myklebust75898062009-08-09 15:14:17 -0400869 err);
Trond Myklebustf1345852005-09-23 11:08:25 -0400870 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871}
Trond Myklebust468039e2008-12-23 15:21:31 -0500872EXPORT_SYMBOL_GPL(rpc_mkpipe);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873
J. Bruce Fields93a44a72007-11-06 13:06:03 -0500874/**
875 * rpc_unlink - remove a pipe
876 * @dentry: dentry for the pipe, as returned from rpc_mkpipe
877 *
878 * After this call, lookups will no longer find the pipe, and any
879 * attempts to read or write using preexisting opens of the pipe will
880 * return -EPIPE.
881 */
Trond Myklebustf1345852005-09-23 11:08:25 -0400882int
Trond Myklebust5d674762006-07-31 14:11:48 -0700883rpc_unlink(struct dentry *dentry)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700884{
Trond Myklebust5d674762006-07-31 14:11:48 -0700885 struct dentry *parent;
Trond Myklebustf1345852005-09-23 11:08:25 -0400886 struct inode *dir;
Trond Myklebust5d674762006-07-31 14:11:48 -0700887 int error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700888
Trond Myklebust5d674762006-07-31 14:11:48 -0700889 parent = dget_parent(dentry);
890 dir = parent->d_inode;
Arjan van de Venc6573c22006-07-03 00:25:16 -0700891 mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
Trond Myklebust03a12562007-06-08 14:14:53 -0400892 if (--RPC_I(dentry->d_inode)->nkern_readwriters == 0) {
893 rpc_close_pipes(dentry->d_inode);
894 error = simple_unlink(dir, dentry);
895 if (!error)
896 d_delete(dentry);
897 }
Trond Myklebustf1345852005-09-23 11:08:25 -0400898 dput(dentry);
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800899 mutex_unlock(&dir->i_mutex);
Trond Myklebust5d674762006-07-31 14:11:48 -0700900 dput(parent);
Trond Myklebustf1345852005-09-23 11:08:25 -0400901 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902}
Trond Myklebust468039e2008-12-23 15:21:31 -0500903EXPORT_SYMBOL_GPL(rpc_unlink);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700904
905/*
906 * populate the filesystem
907 */
908static struct super_operations s_ops = {
909 .alloc_inode = rpc_alloc_inode,
910 .destroy_inode = rpc_destroy_inode,
911 .statfs = simple_statfs,
912};
913
914#define RPCAUTH_GSSMAGIC 0x67596969
915
916static int
917rpc_fill_super(struct super_block *sb, void *data, int silent)
918{
919 struct inode *inode;
920 struct dentry *root;
921
922 sb->s_blocksize = PAGE_CACHE_SIZE;
923 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
924 sb->s_magic = RPCAUTH_GSSMAGIC;
925 sb->s_op = &s_ops;
926 sb->s_time_gran = 1;
927
928 inode = rpc_get_inode(sb, S_IFDIR | 0755);
929 if (!inode)
930 return -ENOMEM;
931 root = d_alloc_root(inode);
932 if (!root) {
933 iput(inode);
934 return -ENOMEM;
935 }
936 if (rpc_populate(root, files, RPCAUTH_Root + 1, RPCAUTH_RootEOF))
937 goto out;
938 sb->s_root = root;
939 return 0;
940out:
941 d_genocide(root);
942 dput(root);
943 return -ENOMEM;
944}
945
David Howells454e2392006-06-23 02:02:57 -0700946static int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947rpc_get_sb(struct file_system_type *fs_type,
David Howells454e2392006-06-23 02:02:57 -0700948 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700949{
David Howells454e2392006-06-23 02:02:57 -0700950 return get_sb_single(fs_type, flags, data, rpc_fill_super, mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700951}
952
953static struct file_system_type rpc_pipe_fs_type = {
954 .owner = THIS_MODULE,
955 .name = "rpc_pipefs",
956 .get_sb = rpc_get_sb,
957 .kill_sb = kill_litter_super,
958};
959
960static void
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700961init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700962{
963 struct rpc_inode *rpci = (struct rpc_inode *) foo;
964
Christoph Lametera35afb82007-05-16 22:10:57 -0700965 inode_init_once(&rpci->vfs_inode);
966 rpci->private = NULL;
967 rpci->nreaders = 0;
968 rpci->nwriters = 0;
969 INIT_LIST_HEAD(&rpci->in_upcall);
Trond Myklebust6e84c7b2007-06-07 15:31:36 -0400970 INIT_LIST_HEAD(&rpci->in_downcall);
Christoph Lametera35afb82007-05-16 22:10:57 -0700971 INIT_LIST_HEAD(&rpci->pipe);
972 rpci->pipelen = 0;
973 init_waitqueue_head(&rpci->waitq);
974 INIT_DELAYED_WORK(&rpci->queue_timeout,
975 rpc_timeout_upcall_queue);
976 rpci->ops = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700977}
978
979int register_rpc_pipefs(void)
980{
Akinobu Mita5bd5f582007-05-09 02:34:51 -0700981 int err;
982
Linus Torvalds1da177e2005-04-16 15:20:36 -0700983 rpc_inode_cachep = kmem_cache_create("rpc_inode_cache",
Paul Jacksonfffb60f2006-03-24 03:16:06 -0800984 sizeof(struct rpc_inode),
985 0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
986 SLAB_MEM_SPREAD),
Paul Mundt20c2df82007-07-20 10:11:58 +0900987 init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700988 if (!rpc_inode_cachep)
989 return -ENOMEM;
Akinobu Mita5bd5f582007-05-09 02:34:51 -0700990 err = register_filesystem(&rpc_pipe_fs_type);
991 if (err) {
992 kmem_cache_destroy(rpc_inode_cachep);
993 return err;
994 }
995
Linus Torvalds1da177e2005-04-16 15:20:36 -0700996 return 0;
997}
998
999void unregister_rpc_pipefs(void)
1000{
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -07001001 kmem_cache_destroy(rpc_inode_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001002 unregister_filesystem(&rpc_pipe_fs_type);
1003}