blob: 84f98cbe31c3cf4ce4b19a2ca9e47f6d69783116 [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>
Trond Myklebust2446ab62012-03-01 17:00:56 -050019#include <linux/rcupdate.h>
Jeff Laytone2f0c832013-12-05 07:34:44 -050020#include <linux/utsname.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070021
22#include <asm/ioctls.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#include <linux/poll.h>
24#include <linux/wait.h>
25#include <linux/seq_file.h>
26
27#include <linux/sunrpc/clnt.h>
28#include <linux/workqueue.h>
29#include <linux/sunrpc/rpc_pipe_fs.h>
Trond Myklebust8854e822009-08-09 15:14:30 -040030#include <linux/sunrpc/cache.h>
Stanislav Kinsbursky021c68d2011-12-26 15:39:04 +030031#include <linux/nsproxy.h>
Stanislav Kinsbursky2d001312011-12-26 15:39:13 +030032#include <linux/notifier.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033
Stanislav Kinsbursky021c68d2011-12-26 15:39:04 +030034#include "netns.h"
Stanislav Kinsbursky2d001312011-12-26 15:39:13 +030035#include "sunrpc.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070036
Stanislav Kinsburskyefc46bf2011-12-26 15:39:47 +030037#define RPCDBG_FACILITY RPCDBG_DEBUG
38
39#define NET_NAME(net) ((net == &init_net) ? " (init_net)" : "")
Linus Torvalds1da177e2005-04-16 15:20:36 -070040
41static struct file_system_type rpc_pipe_fs_type;
Jeff Layton4b9a4452013-11-14 07:25:17 -050042static const struct rpc_pipe_ops gssd_dummy_pipe_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -070043
Christoph Lametere18b8902006-12-06 20:33:20 -080044static struct kmem_cache *rpc_inode_cachep __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -070045
46#define RPC_UPCALL_TIMEOUT (30*HZ)
47
Stanislav Kinsbursky2d001312011-12-26 15:39:13 +030048static BLOCKING_NOTIFIER_HEAD(rpc_pipefs_notifier_list);
49
50int rpc_pipefs_notifier_register(struct notifier_block *nb)
51{
52 return blocking_notifier_chain_cond_register(&rpc_pipefs_notifier_list, nb);
53}
54EXPORT_SYMBOL_GPL(rpc_pipefs_notifier_register);
55
56void rpc_pipefs_notifier_unregister(struct notifier_block *nb)
57{
58 blocking_notifier_chain_unregister(&rpc_pipefs_notifier_list, nb);
59}
60EXPORT_SYMBOL_GPL(rpc_pipefs_notifier_unregister);
61
Stanislav Kinsbursky591ad7f2012-02-27 22:05:54 +040062static void rpc_purge_list(wait_queue_head_t *waitq, struct list_head *head,
Trond Myklebust9842ef32006-02-01 12:18:44 -050063 void (*destroy_msg)(struct rpc_pipe_msg *), int err)
Trond Myklebustb3eb67a2005-11-25 17:10:11 -050064{
65 struct rpc_pipe_msg *msg;
Trond Myklebustb3eb67a2005-11-25 17:10:11 -050066
Trond Myklebust9842ef32006-02-01 12:18:44 -050067 if (list_empty(head))
68 return;
69 do {
Trond Myklebustb3eb67a2005-11-25 17:10:11 -050070 msg = list_entry(head->next, struct rpc_pipe_msg, list);
Trond Myklebust5a676572010-09-12 19:55:25 -040071 list_del_init(&msg->list);
Trond Myklebustb3eb67a2005-11-25 17:10:11 -050072 msg->errno = err;
73 destroy_msg(msg);
Trond Myklebust9842ef32006-02-01 12:18:44 -050074 } while (!list_empty(head));
Jeff Layton92123e02012-06-11 10:03:42 -040075
76 if (waitq)
77 wake_up(waitq);
Linus Torvalds1da177e2005-04-16 15:20:36 -070078}
79
80static void
David Howells65f27f32006-11-22 14:55:48 +000081rpc_timeout_upcall_queue(struct work_struct *work)
Linus Torvalds1da177e2005-04-16 15:20:36 -070082{
Trond Myklebust9842ef32006-02-01 12:18:44 -050083 LIST_HEAD(free_list);
Stanislav Kinsburskyba9e0972011-12-26 15:43:32 +030084 struct rpc_pipe *pipe =
85 container_of(work, struct rpc_pipe, queue_timeout.work);
Trond Myklebust9842ef32006-02-01 12:18:44 -050086 void (*destroy_msg)(struct rpc_pipe_msg *);
Stanislav Kinsbursky591ad7f2012-02-27 22:05:54 +040087 struct dentry *dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -070088
Stanislav Kinsburskyba9e0972011-12-26 15:43:32 +030089 spin_lock(&pipe->lock);
Stanislav Kinsburskyba9e0972011-12-26 15:43:32 +030090 destroy_msg = pipe->ops->destroy_msg;
91 if (pipe->nreaders == 0) {
92 list_splice_init(&pipe->pipe, &free_list);
93 pipe->pipelen = 0;
Trond Myklebust9842ef32006-02-01 12:18:44 -050094 }
Stanislav Kinsbursky591ad7f2012-02-27 22:05:54 +040095 dentry = dget(pipe->dentry);
Stanislav Kinsburskyba9e0972011-12-26 15:43:32 +030096 spin_unlock(&pipe->lock);
David Howellsc5ef6032015-03-17 22:26:16 +000097 rpc_purge_list(dentry ? &RPC_I(d_inode(dentry))->waitq : NULL,
Jeff Layton92123e02012-06-11 10:03:42 -040098 &free_list, destroy_msg, -ETIMEDOUT);
99 dput(dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100}
101
Peng Taoc1225152011-09-22 21:50:10 -0400102ssize_t rpc_pipe_generic_upcall(struct file *filp, struct rpc_pipe_msg *msg,
103 char __user *dst, size_t buflen)
104{
105 char *data = (char *)msg->data + msg->copied;
106 size_t mlen = min(msg->len - msg->copied, buflen);
107 unsigned long left;
108
109 left = copy_to_user(dst, data, mlen);
110 if (left == mlen) {
111 msg->errno = -EFAULT;
112 return -EFAULT;
113 }
114
115 mlen -= left;
116 msg->copied += mlen;
117 msg->errno = 0;
118 return mlen;
119}
120EXPORT_SYMBOL_GPL(rpc_pipe_generic_upcall);
121
J. Bruce Fields93a44a72007-11-06 13:06:03 -0500122/**
Ben Hutchings1a5778a2010-02-14 22:35:47 -0800123 * rpc_queue_upcall - queue an upcall message to userspace
Randy Dunlapbda14602012-05-13 10:35:40 -0700124 * @pipe: upcall pipe on which to queue given message
J. Bruce Fields93a44a72007-11-06 13:06:03 -0500125 * @msg: message to queue
126 *
127 * Call with an @inode created by rpc_mkpipe() to queue an upcall.
128 * A userspace process may then later read the upcall by performing a
129 * read on an open file for this inode. It is up to the caller to
130 * initialize the fields of @msg (other than @msg->list) appropriately.
131 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132int
Stanislav Kinsburskyd706ed12011-12-26 15:43:49 +0300133rpc_queue_upcall(struct rpc_pipe *pipe, struct rpc_pipe_msg *msg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134{
Trond Myklebust6070fe62005-10-27 22:12:46 -0400135 int res = -EPIPE;
Stanislav Kinsbursky591ad7f2012-02-27 22:05:54 +0400136 struct dentry *dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137
Stanislav Kinsburskyd0fe13b2011-12-26 15:43:41 +0300138 spin_lock(&pipe->lock);
Stanislav Kinsburskyd0fe13b2011-12-26 15:43:41 +0300139 if (pipe->nreaders) {
140 list_add_tail(&msg->list, &pipe->pipe);
141 pipe->pipelen += msg->len;
Trond Myklebust6070fe62005-10-27 22:12:46 -0400142 res = 0;
Stanislav Kinsburskyd0fe13b2011-12-26 15:43:41 +0300143 } else if (pipe->flags & RPC_PIPE_WAIT_FOR_OPEN) {
144 if (list_empty(&pipe->pipe))
Trond Myklebust24c5d9d2006-03-20 13:44:08 -0500145 queue_delayed_work(rpciod_workqueue,
Stanislav Kinsburskyd0fe13b2011-12-26 15:43:41 +0300146 &pipe->queue_timeout,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 RPC_UPCALL_TIMEOUT);
Stanislav Kinsburskyd0fe13b2011-12-26 15:43:41 +0300148 list_add_tail(&msg->list, &pipe->pipe);
149 pipe->pipelen += msg->len;
Trond Myklebust6070fe62005-10-27 22:12:46 -0400150 res = 0;
151 }
Stanislav Kinsbursky591ad7f2012-02-27 22:05:54 +0400152 dentry = dget(pipe->dentry);
Stanislav Kinsburskyd0fe13b2011-12-26 15:43:41 +0300153 spin_unlock(&pipe->lock);
Stanislav Kinsbursky591ad7f2012-02-27 22:05:54 +0400154 if (dentry) {
David Howellsc5ef6032015-03-17 22:26:16 +0000155 wake_up(&RPC_I(d_inode(dentry))->waitq);
Stanislav Kinsbursky591ad7f2012-02-27 22:05:54 +0400156 dput(dentry);
157 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 return res;
159}
Trond Myklebust468039e2008-12-23 15:21:31 -0500160EXPORT_SYMBOL_GPL(rpc_queue_upcall);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161
Trond Myklebust6070fe62005-10-27 22:12:46 -0400162static inline void
163rpc_inode_setowner(struct inode *inode, void *private)
164{
165 RPC_I(inode)->private = private;
166}
167
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168static void
169rpc_close_pipes(struct inode *inode)
170{
Stanislav Kinsburskyba9e0972011-12-26 15:43:32 +0300171 struct rpc_pipe *pipe = RPC_I(inode)->pipe;
\"J. Bruce Fields\e7128042008-12-23 16:09:47 -0500172 int need_release;
Stanislav Kinsburskyad6b1342012-01-10 16:12:38 +0400173 LIST_HEAD(free_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174
Al Viro59551022016-01-22 15:40:57 -0500175 inode_lock(inode);
Stanislav Kinsburskyad6b1342012-01-10 16:12:38 +0400176 spin_lock(&pipe->lock);
177 need_release = pipe->nreaders != 0 || pipe->nwriters != 0;
178 pipe->nreaders = 0;
179 list_splice_init(&pipe->in_upcall, &free_list);
180 list_splice_init(&pipe->pipe, &free_list);
181 pipe->pipelen = 0;
182 pipe->dentry = NULL;
183 spin_unlock(&pipe->lock);
Stanislav Kinsbursky591ad7f2012-02-27 22:05:54 +0400184 rpc_purge_list(&RPC_I(inode)->waitq, &free_list, pipe->ops->destroy_msg, -EPIPE);
Stanislav Kinsburskyad6b1342012-01-10 16:12:38 +0400185 pipe->nwriters = 0;
186 if (need_release && pipe->ops->release_pipe)
187 pipe->ops->release_pipe(inode);
188 cancel_delayed_work_sync(&pipe->queue_timeout);
Trond Myklebust6070fe62005-10-27 22:12:46 -0400189 rpc_inode_setowner(inode, NULL);
Stanislav Kinsbursky2c9030e2012-02-27 22:05:45 +0400190 RPC_I(inode)->pipe = NULL;
Al Viro59551022016-01-22 15:40:57 -0500191 inode_unlock(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192}
193
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194static struct inode *
195rpc_alloc_inode(struct super_block *sb)
196{
197 struct rpc_inode *rpci;
Himangi Saraogiadcda652014-06-10 20:19:17 +0530198 rpci = kmem_cache_alloc(rpc_inode_cachep, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 if (!rpci)
200 return NULL;
201 return &rpci->vfs_inode;
202}
203
204static void
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100205rpc_i_callback(struct rcu_head *head)
206{
207 struct inode *inode = container_of(head, struct inode, i_rcu);
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100208 kmem_cache_free(rpc_inode_cachep, RPC_I(inode));
209}
210
211static void
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212rpc_destroy_inode(struct inode *inode)
213{
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100214 call_rcu(&inode->i_rcu, rpc_i_callback);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215}
216
217static int
218rpc_pipe_open(struct inode *inode, struct file *filp)
219{
Stanislav Kinsbursky2c9030e2012-02-27 22:05:45 +0400220 struct rpc_pipe *pipe;
\"J. Bruce Fields\c3810602008-12-23 16:08:32 -0500221 int first_open;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222 int res = -ENXIO;
223
Al Viro59551022016-01-22 15:40:57 -0500224 inode_lock(inode);
Stanislav Kinsbursky2c9030e2012-02-27 22:05:45 +0400225 pipe = RPC_I(inode)->pipe;
226 if (pipe == NULL)
\"J. Bruce Fields\c3810602008-12-23 16:08:32 -0500227 goto out;
Stanislav Kinsburskyd0fe13b2011-12-26 15:43:41 +0300228 first_open = pipe->nreaders == 0 && pipe->nwriters == 0;
229 if (first_open && pipe->ops->open_pipe) {
230 res = pipe->ops->open_pipe(inode);
\"J. Bruce Fields\c3810602008-12-23 16:08:32 -0500231 if (res)
232 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 }
\"J. Bruce Fields\c3810602008-12-23 16:08:32 -0500234 if (filp->f_mode & FMODE_READ)
Stanislav Kinsburskyd0fe13b2011-12-26 15:43:41 +0300235 pipe->nreaders++;
\"J. Bruce Fields\c3810602008-12-23 16:08:32 -0500236 if (filp->f_mode & FMODE_WRITE)
Stanislav Kinsburskyd0fe13b2011-12-26 15:43:41 +0300237 pipe->nwriters++;
\"J. Bruce Fields\c3810602008-12-23 16:08:32 -0500238 res = 0;
239out:
Al Viro59551022016-01-22 15:40:57 -0500240 inode_unlock(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 return res;
242}
243
244static int
245rpc_pipe_release(struct inode *inode, struct file *filp)
246{
Stanislav Kinsbursky2c9030e2012-02-27 22:05:45 +0400247 struct rpc_pipe *pipe;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248 struct rpc_pipe_msg *msg;
\"J. Bruce Fields\e7128042008-12-23 16:09:47 -0500249 int last_close;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250
Al Viro59551022016-01-22 15:40:57 -0500251 inode_lock(inode);
Stanislav Kinsbursky2c9030e2012-02-27 22:05:45 +0400252 pipe = RPC_I(inode)->pipe;
253 if (pipe == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 goto out;
Joe Perches655b5bb2010-09-04 18:52:53 -0700255 msg = filp->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256 if (msg != NULL) {
Stanislav Kinsburskyba9e0972011-12-26 15:43:32 +0300257 spin_lock(&pipe->lock);
Trond Myklebust48e49182005-12-19 17:11:22 -0500258 msg->errno = -EAGAIN;
Trond Myklebust5a676572010-09-12 19:55:25 -0400259 list_del_init(&msg->list);
Stanislav Kinsburskyba9e0972011-12-26 15:43:32 +0300260 spin_unlock(&pipe->lock);
261 pipe->ops->destroy_msg(msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 }
263 if (filp->f_mode & FMODE_WRITE)
Stanislav Kinsburskyba9e0972011-12-26 15:43:32 +0300264 pipe->nwriters --;
Trond Myklebust9842ef32006-02-01 12:18:44 -0500265 if (filp->f_mode & FMODE_READ) {
Stanislav Kinsburskyba9e0972011-12-26 15:43:32 +0300266 pipe->nreaders --;
267 if (pipe->nreaders == 0) {
Trond Myklebust9842ef32006-02-01 12:18:44 -0500268 LIST_HEAD(free_list);
Stanislav Kinsburskyba9e0972011-12-26 15:43:32 +0300269 spin_lock(&pipe->lock);
270 list_splice_init(&pipe->pipe, &free_list);
271 pipe->pipelen = 0;
272 spin_unlock(&pipe->lock);
Stanislav Kinsbursky591ad7f2012-02-27 22:05:54 +0400273 rpc_purge_list(&RPC_I(inode)->waitq, &free_list,
Stanislav Kinsburskyba9e0972011-12-26 15:43:32 +0300274 pipe->ops->destroy_msg, -EAGAIN);
Trond Myklebust9842ef32006-02-01 12:18:44 -0500275 }
276 }
Stanislav Kinsburskyba9e0972011-12-26 15:43:32 +0300277 last_close = pipe->nwriters == 0 && pipe->nreaders == 0;
278 if (last_close && pipe->ops->release_pipe)
279 pipe->ops->release_pipe(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280out:
Al Viro59551022016-01-22 15:40:57 -0500281 inode_unlock(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 return 0;
283}
284
285static ssize_t
286rpc_pipe_read(struct file *filp, char __user *buf, size_t len, loff_t *offset)
287{
Al Viro496ad9a2013-01-23 17:07:38 -0500288 struct inode *inode = file_inode(filp);
Stanislav Kinsbursky2c9030e2012-02-27 22:05:45 +0400289 struct rpc_pipe *pipe;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290 struct rpc_pipe_msg *msg;
291 int res = 0;
292
Al Viro59551022016-01-22 15:40:57 -0500293 inode_lock(inode);
Stanislav Kinsbursky2c9030e2012-02-27 22:05:45 +0400294 pipe = RPC_I(inode)->pipe;
295 if (pipe == NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 res = -EPIPE;
297 goto out_unlock;
298 }
299 msg = filp->private_data;
300 if (msg == NULL) {
Stanislav Kinsburskyd0fe13b2011-12-26 15:43:41 +0300301 spin_lock(&pipe->lock);
302 if (!list_empty(&pipe->pipe)) {
303 msg = list_entry(pipe->pipe.next,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304 struct rpc_pipe_msg,
305 list);
Stanislav Kinsburskyd0fe13b2011-12-26 15:43:41 +0300306 list_move(&msg->list, &pipe->in_upcall);
307 pipe->pipelen -= msg->len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308 filp->private_data = msg;
309 msg->copied = 0;
310 }
Stanislav Kinsburskyd0fe13b2011-12-26 15:43:41 +0300311 spin_unlock(&pipe->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 if (msg == NULL)
313 goto out_unlock;
314 }
315 /* NOTE: it is up to the callback to update msg->copied */
Stanislav Kinsburskyd0fe13b2011-12-26 15:43:41 +0300316 res = pipe->ops->upcall(filp, msg, buf, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317 if (res < 0 || msg->len == msg->copied) {
318 filp->private_data = NULL;
Stanislav Kinsburskyd0fe13b2011-12-26 15:43:41 +0300319 spin_lock(&pipe->lock);
Trond Myklebust5a676572010-09-12 19:55:25 -0400320 list_del_init(&msg->list);
Stanislav Kinsburskyd0fe13b2011-12-26 15:43:41 +0300321 spin_unlock(&pipe->lock);
322 pipe->ops->destroy_msg(msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323 }
324out_unlock:
Al Viro59551022016-01-22 15:40:57 -0500325 inode_unlock(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 return res;
327}
328
329static ssize_t
330rpc_pipe_write(struct file *filp, const char __user *buf, size_t len, loff_t *offset)
331{
Al Viro496ad9a2013-01-23 17:07:38 -0500332 struct inode *inode = file_inode(filp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333 int res;
334
Al Viro59551022016-01-22 15:40:57 -0500335 inode_lock(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336 res = -EPIPE;
Stanislav Kinsbursky2c9030e2012-02-27 22:05:45 +0400337 if (RPC_I(inode)->pipe != NULL)
338 res = RPC_I(inode)->pipe->ops->downcall(filp, buf, len);
Al Viro59551022016-01-22 15:40:57 -0500339 inode_unlock(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340 return res;
341}
342
343static unsigned int
344rpc_pipe_poll(struct file *filp, struct poll_table_struct *wait)
345{
Al Viro496ad9a2013-01-23 17:07:38 -0500346 struct inode *inode = file_inode(filp);
Stanislav Kinsbursky591ad7f2012-02-27 22:05:54 +0400347 struct rpc_inode *rpci = RPC_I(inode);
348 unsigned int mask = POLLOUT | POLLWRNORM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 poll_wait(filp, &rpci->waitq, wait);
351
Al Viro59551022016-01-22 15:40:57 -0500352 inode_lock(inode);
Stanislav Kinsbursky591ad7f2012-02-27 22:05:54 +0400353 if (rpci->pipe == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 mask |= POLLERR | POLLHUP;
Stanislav Kinsbursky591ad7f2012-02-27 22:05:54 +0400355 else if (filp->private_data || !list_empty(&rpci->pipe->pipe))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 mask |= POLLIN | POLLRDNORM;
Al Viro59551022016-01-22 15:40:57 -0500357 inode_unlock(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358 return mask;
359}
360
Arnd Bergmanna6f8dbc2010-10-04 21:18:23 +0200361static long
362rpc_pipe_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363{
Al Viro496ad9a2013-01-23 17:07:38 -0500364 struct inode *inode = file_inode(filp);
Stanislav Kinsbursky2c9030e2012-02-27 22:05:45 +0400365 struct rpc_pipe *pipe;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366 int len;
367
368 switch (cmd) {
369 case FIONREAD:
Al Viro59551022016-01-22 15:40:57 -0500370 inode_lock(inode);
Stanislav Kinsbursky2c9030e2012-02-27 22:05:45 +0400371 pipe = RPC_I(inode)->pipe;
372 if (pipe == NULL) {
Al Viro59551022016-01-22 15:40:57 -0500373 inode_unlock(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374 return -EPIPE;
Arnd Bergmanna6f8dbc2010-10-04 21:18:23 +0200375 }
Stanislav Kinsbursky2c9030e2012-02-27 22:05:45 +0400376 spin_lock(&pipe->lock);
Stanislav Kinsburskyd0fe13b2011-12-26 15:43:41 +0300377 len = pipe->pipelen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378 if (filp->private_data) {
379 struct rpc_pipe_msg *msg;
Joe Perches655b5bb2010-09-04 18:52:53 -0700380 msg = filp->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381 len += msg->len - msg->copied;
382 }
Stanislav Kinsburskyd0fe13b2011-12-26 15:43:41 +0300383 spin_unlock(&pipe->lock);
Al Viro59551022016-01-22 15:40:57 -0500384 inode_unlock(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 return put_user(len, (int __user *)arg);
386 default:
387 return -EINVAL;
388 }
389}
390
Arjan van de Venda7071d2007-02-12 00:55:36 -0800391static const struct file_operations rpc_pipe_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392 .owner = THIS_MODULE,
393 .llseek = no_llseek,
394 .read = rpc_pipe_read,
395 .write = rpc_pipe_write,
396 .poll = rpc_pipe_poll,
Frederic Weisbecker674b6042010-05-19 15:08:17 +0200397 .unlocked_ioctl = rpc_pipe_ioctl,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398 .open = rpc_pipe_open,
399 .release = rpc_pipe_release,
400};
401
402static int
403rpc_show_info(struct seq_file *m, void *v)
404{
405 struct rpc_clnt *clnt = m->private;
406
Trond Myklebust2446ab62012-03-01 17:00:56 -0500407 rcu_read_lock();
Trond Myklebust4e0038b2012-03-01 17:01:05 -0500408 seq_printf(m, "RPC server: %s\n",
409 rcu_dereference(clnt->cl_xprt)->servername);
Trond Myklebust55909f22013-08-23 11:48:15 -0400410 seq_printf(m, "service: %s (%d) version %d\n", clnt->cl_program->name,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411 clnt->cl_prog, clnt->cl_vers);
Chuck Levere7f78652006-08-22 20:06:19 -0400412 seq_printf(m, "address: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_ADDR));
413 seq_printf(m, "protocol: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PROTO));
J. Bruce Fieldsbf19aac2007-09-26 14:38:09 -0400414 seq_printf(m, "port: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PORT));
Trond Myklebust2446ab62012-03-01 17:00:56 -0500415 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416 return 0;
417}
418
419static int
420rpc_info_open(struct inode *inode, struct file *file)
421{
Trond Myklebust006abe82010-09-12 19:55:25 -0400422 struct rpc_clnt *clnt = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423 int ret = single_open(file, rpc_show_info, NULL);
424
425 if (!ret) {
426 struct seq_file *m = file->private_data;
Trond Myklebust006abe82010-09-12 19:55:25 -0400427
428 spin_lock(&file->f_path.dentry->d_lock);
429 if (!d_unhashed(file->f_path.dentry))
430 clnt = RPC_I(inode)->private;
431 if (clnt != NULL && atomic_inc_not_zero(&clnt->cl_count)) {
432 spin_unlock(&file->f_path.dentry->d_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433 m->private = clnt;
434 } else {
Trond Myklebust006abe82010-09-12 19:55:25 -0400435 spin_unlock(&file->f_path.dentry->d_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436 single_release(inode, file);
437 ret = -EINVAL;
438 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439 }
440 return ret;
441}
442
443static int
444rpc_info_release(struct inode *inode, struct file *file)
445{
446 struct seq_file *m = file->private_data;
447 struct rpc_clnt *clnt = (struct rpc_clnt *)m->private;
448
449 if (clnt)
450 rpc_release_client(clnt);
451 return single_release(inode, file);
452}
453
Arjan van de Venda7071d2007-02-12 00:55:36 -0800454static const struct file_operations rpc_info_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455 .owner = THIS_MODULE,
456 .open = rpc_info_open,
457 .read = seq_read,
458 .llseek = seq_lseek,
459 .release = rpc_info_release,
460};
461
462
463/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 * Description of fs contents.
465 */
466struct rpc_filelist {
Trond Myklebustac6fece2009-08-09 15:14:20 -0400467 const char *name;
Arjan van de Ven99ac48f2006-03-28 01:56:41 -0800468 const struct file_operations *i_fop;
Trond Myklebust7364af62009-08-09 15:14:16 -0400469 umode_t mode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470};
471
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472static struct inode *
Trond Myklebust7364af62009-08-09 15:14:16 -0400473rpc_get_inode(struct super_block *sb, umode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474{
475 struct inode *inode = new_inode(sb);
476 if (!inode)
477 return NULL;
Christoph Hellwig85fe4022010-10-23 11:19:54 -0400478 inode->i_ino = get_next_ino();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479 inode->i_mode = mode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
Joe Perches89f0e4f2011-07-01 09:43:12 +0000481 switch (mode & S_IFMT) {
482 case S_IFDIR:
483 inode->i_fop = &simple_dir_operations;
Jeff Layton275448e2013-07-16 09:16:45 -0400484 inode->i_op = &simple_dir_inode_operations;
Joe Perches89f0e4f2011-07-01 09:43:12 +0000485 inc_nlink(inode);
486 default:
487 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488 }
489 return inode;
490}
491
Trond Myklebust75898062009-08-09 15:14:17 -0400492static int __rpc_create_common(struct inode *dir, struct dentry *dentry,
493 umode_t mode,
494 const struct file_operations *i_fop,
495 void *private)
496{
497 struct inode *inode;
498
Trond Myklebustbeb0f0a2010-12-20 21:19:26 +0000499 d_drop(dentry);
Trond Myklebust75898062009-08-09 15:14:17 -0400500 inode = rpc_get_inode(dir->i_sb, mode);
501 if (!inode)
502 goto out_err;
503 inode->i_ino = iunique(dir->i_sb, 100);
504 if (i_fop)
505 inode->i_fop = i_fop;
506 if (private)
507 rpc_inode_setowner(inode, private);
508 d_add(dentry, inode);
509 return 0;
510out_err:
Al Viro1e903ed2013-09-16 10:57:41 -0400511 printk(KERN_WARNING "%s: %s failed to allocate inode for dentry %pd\n",
512 __FILE__, __func__, dentry);
Trond Myklebust75898062009-08-09 15:14:17 -0400513 dput(dentry);
514 return -ENOMEM;
515}
516
Trond Myklebustac6fece2009-08-09 15:14:20 -0400517static int __rpc_create(struct inode *dir, struct dentry *dentry,
518 umode_t mode,
519 const struct file_operations *i_fop,
520 void *private)
521{
522 int err;
523
524 err = __rpc_create_common(dir, dentry, S_IFREG | mode, i_fop, private);
525 if (err)
526 return err;
527 fsnotify_create(dir, dentry);
528 return 0;
529}
530
Trond Myklebust75898062009-08-09 15:14:17 -0400531static int __rpc_mkdir(struct inode *dir, struct dentry *dentry,
532 umode_t mode,
533 const struct file_operations *i_fop,
534 void *private)
535{
536 int err;
537
538 err = __rpc_create_common(dir, dentry, S_IFDIR | mode, i_fop, private);
539 if (err)
540 return err;
541 inc_nlink(dir);
542 fsnotify_mkdir(dir, dentry);
543 return 0;
544}
545
Stanislav Kinsburskyba9e0972011-12-26 15:43:32 +0300546static void
547init_pipe(struct rpc_pipe *pipe)
548{
549 pipe->nreaders = 0;
550 pipe->nwriters = 0;
551 INIT_LIST_HEAD(&pipe->in_upcall);
552 INIT_LIST_HEAD(&pipe->in_downcall);
553 INIT_LIST_HEAD(&pipe->pipe);
554 pipe->pipelen = 0;
Stanislav Kinsburskyba9e0972011-12-26 15:43:32 +0300555 INIT_DELAYED_WORK(&pipe->queue_timeout,
556 rpc_timeout_upcall_queue);
557 pipe->ops = NULL;
558 spin_lock_init(&pipe->lock);
Stanislav Kinsburskyc239d832011-12-26 15:44:06 +0300559 pipe->dentry = NULL;
Stanislav Kinsburskyba9e0972011-12-26 15:43:32 +0300560}
561
Stanislav Kinsburskyc239d832011-12-26 15:44:06 +0300562void rpc_destroy_pipe_data(struct rpc_pipe *pipe)
563{
564 kfree(pipe);
565}
566EXPORT_SYMBOL_GPL(rpc_destroy_pipe_data);
567
568struct rpc_pipe *rpc_mkpipe_data(const struct rpc_pipe_ops *ops, int flags)
Trond Myklebust75898062009-08-09 15:14:17 -0400569{
Stanislav Kinsburskyba9e0972011-12-26 15:43:32 +0300570 struct rpc_pipe *pipe;
Trond Myklebust75898062009-08-09 15:14:17 -0400571
Stanislav Kinsburskyba9e0972011-12-26 15:43:32 +0300572 pipe = kzalloc(sizeof(struct rpc_pipe), GFP_KERNEL);
573 if (!pipe)
Stanislav Kinsburskyc239d832011-12-26 15:44:06 +0300574 return ERR_PTR(-ENOMEM);
Stanislav Kinsburskyba9e0972011-12-26 15:43:32 +0300575 init_pipe(pipe);
Stanislav Kinsburskyc239d832011-12-26 15:44:06 +0300576 pipe->ops = ops;
577 pipe->flags = flags;
578 return pipe;
579}
580EXPORT_SYMBOL_GPL(rpc_mkpipe_data);
581
582static int __rpc_mkpipe_dentry(struct inode *dir, struct dentry *dentry,
583 umode_t mode,
584 const struct file_operations *i_fop,
585 void *private,
586 struct rpc_pipe *pipe)
Trond Myklebust75898062009-08-09 15:14:17 -0400587{
588 struct rpc_inode *rpci;
589 int err;
590
591 err = __rpc_create_common(dir, dentry, S_IFIFO | mode, i_fop, private);
592 if (err)
593 return err;
David Howellsc5ef6032015-03-17 22:26:16 +0000594 rpci = RPC_I(d_inode(dentry));
Trond Myklebust75898062009-08-09 15:14:17 -0400595 rpci->private = private;
Stanislav Kinsburskyba9e0972011-12-26 15:43:32 +0300596 rpci->pipe = pipe;
Trond Myklebust75898062009-08-09 15:14:17 -0400597 fsnotify_create(dir, dentry);
598 return 0;
599}
600
Trond Myklebustac6fece2009-08-09 15:14:20 -0400601static int __rpc_rmdir(struct inode *dir, struct dentry *dentry)
602{
603 int ret;
604
605 dget(dentry);
606 ret = simple_rmdir(dir, dentry);
607 d_delete(dentry);
608 dput(dentry);
609 return ret;
610}
611
Stanislav Kinsburskyeee17322012-01-10 16:13:19 +0400612int rpc_rmdir(struct dentry *dentry)
613{
614 struct dentry *parent;
615 struct inode *dir;
616 int error;
617
618 parent = dget_parent(dentry);
David Howellsc5ef6032015-03-17 22:26:16 +0000619 dir = d_inode(parent);
Al Viro59551022016-01-22 15:40:57 -0500620 inode_lock_nested(dir, I_MUTEX_PARENT);
Stanislav Kinsburskyeee17322012-01-10 16:13:19 +0400621 error = __rpc_rmdir(dir, dentry);
Al Viro59551022016-01-22 15:40:57 -0500622 inode_unlock(dir);
Stanislav Kinsburskyeee17322012-01-10 16:13:19 +0400623 dput(parent);
624 return error;
625}
626EXPORT_SYMBOL_GPL(rpc_rmdir);
627
Trond Myklebust810d90b2009-08-09 15:14:18 -0400628static int __rpc_unlink(struct inode *dir, struct dentry *dentry)
629{
630 int ret;
631
632 dget(dentry);
633 ret = simple_unlink(dir, dentry);
634 d_delete(dentry);
635 dput(dentry);
636 return ret;
637}
638
639static int __rpc_rmpipe(struct inode *dir, struct dentry *dentry)
640{
David Howellsc5ef6032015-03-17 22:26:16 +0000641 struct inode *inode = d_inode(dentry);
Trond Myklebust810d90b2009-08-09 15:14:18 -0400642
Trond Myklebust810d90b2009-08-09 15:14:18 -0400643 rpc_close_pipes(inode);
644 return __rpc_unlink(dir, dentry);
645}
646
Trond Myklebustcfeaa4a2009-08-09 15:14:20 -0400647static struct dentry *__rpc_lookup_create_exclusive(struct dentry *parent,
Al Virod3db90b2013-07-14 17:09:57 +0400648 const char *name)
Trond Myklebustcfeaa4a2009-08-09 15:14:20 -0400649{
Al Virod3db90b2013-07-14 17:09:57 +0400650 struct qstr q = QSTR_INIT(name, strlen(name));
651 struct dentry *dentry = d_hash_and_lookup(parent, &q);
Stanislav Kinsbursky5bff0382011-11-08 15:09:19 +0300652 if (!dentry) {
Al Virod3db90b2013-07-14 17:09:57 +0400653 dentry = d_alloc(parent, &q);
Stanislav Kinsbursky5bff0382011-11-08 15:09:19 +0300654 if (!dentry)
655 return ERR_PTR(-ENOMEM);
656 }
David Howellsc5ef6032015-03-17 22:26:16 +0000657 if (d_really_is_negative(dentry))
Dan Carpenterf1f0abe2010-03-21 12:10:34 -0400658 return dentry;
Trond Myklebustcfeaa4a2009-08-09 15:14:20 -0400659 dput(dentry);
660 return ERR_PTR(-EEXIST);
661}
662
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663/*
664 * FIXME: This probably has races.
665 */
Trond Myklebustac6fece2009-08-09 15:14:20 -0400666static void __rpc_depopulate(struct dentry *parent,
667 const struct rpc_filelist *files,
668 int start, int eof)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669{
David Howellsc5ef6032015-03-17 22:26:16 +0000670 struct inode *dir = d_inode(parent);
Trond Myklebustac6fece2009-08-09 15:14:20 -0400671 struct dentry *dentry;
672 struct qstr name;
673 int i;
674
675 for (i = start; i < eof; i++) {
676 name.name = files[i].name;
677 name.len = strlen(files[i].name);
Al Virod3db90b2013-07-14 17:09:57 +0400678 dentry = d_hash_and_lookup(parent, &name);
Trond Myklebustac6fece2009-08-09 15:14:20 -0400679
680 if (dentry == NULL)
681 continue;
David Howellsc5ef6032015-03-17 22:26:16 +0000682 if (d_really_is_negative(dentry))
Trond Myklebustac6fece2009-08-09 15:14:20 -0400683 goto next;
David Howellsc5ef6032015-03-17 22:26:16 +0000684 switch (d_inode(dentry)->i_mode & S_IFMT) {
Trond Myklebustac6fece2009-08-09 15:14:20 -0400685 default:
686 BUG();
687 case S_IFREG:
688 __rpc_unlink(dir, dentry);
689 break;
690 case S_IFDIR:
691 __rpc_rmdir(dir, dentry);
692 }
693next:
694 dput(dentry);
695 }
696}
697
698static void rpc_depopulate(struct dentry *parent,
699 const struct rpc_filelist *files,
700 int start, int eof)
701{
David Howellsc5ef6032015-03-17 22:26:16 +0000702 struct inode *dir = d_inode(parent);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703
Al Viro59551022016-01-22 15:40:57 -0500704 inode_lock_nested(dir, I_MUTEX_CHILD);
Trond Myklebustac6fece2009-08-09 15:14:20 -0400705 __rpc_depopulate(parent, files, start, eof);
Al Viro59551022016-01-22 15:40:57 -0500706 inode_unlock(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707}
708
Trond Myklebustac6fece2009-08-09 15:14:20 -0400709static int rpc_populate(struct dentry *parent,
710 const struct rpc_filelist *files,
711 int start, int eof,
712 void *private)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713{
David Howellsc5ef6032015-03-17 22:26:16 +0000714 struct inode *dir = d_inode(parent);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700715 struct dentry *dentry;
Trond Myklebustac6fece2009-08-09 15:14:20 -0400716 int i, err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717
Al Viro59551022016-01-22 15:40:57 -0500718 inode_lock(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719 for (i = start; i < eof; i++) {
Al Virod3db90b2013-07-14 17:09:57 +0400720 dentry = __rpc_lookup_create_exclusive(parent, files[i].name);
Trond Myklebustac6fece2009-08-09 15:14:20 -0400721 err = PTR_ERR(dentry);
722 if (IS_ERR(dentry))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723 goto out_bad;
Trond Myklebustac6fece2009-08-09 15:14:20 -0400724 switch (files[i].mode & S_IFMT) {
725 default:
726 BUG();
727 case S_IFREG:
728 err = __rpc_create(dir, dentry,
729 files[i].mode,
730 files[i].i_fop,
731 private);
732 break;
733 case S_IFDIR:
734 err = __rpc_mkdir(dir, dentry,
735 files[i].mode,
736 NULL,
737 private);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738 }
Trond Myklebustac6fece2009-08-09 15:14:20 -0400739 if (err != 0)
740 goto out_bad;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741 }
Al Viro59551022016-01-22 15:40:57 -0500742 inode_unlock(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700743 return 0;
744out_bad:
Trond Myklebustac6fece2009-08-09 15:14:20 -0400745 __rpc_depopulate(parent, files, start, eof);
Al Viro59551022016-01-22 15:40:57 -0500746 inode_unlock(dir);
Al Viro1e903ed2013-09-16 10:57:41 -0400747 printk(KERN_WARNING "%s: %s failed to populate directory %pd\n",
748 __FILE__, __func__, parent);
Trond Myklebustac6fece2009-08-09 15:14:20 -0400749 return err;
Trond Myklebustf1345852005-09-23 11:08:25 -0400750}
Christoph Hellwig278c9952005-07-24 23:53:01 +0100751
Trond Myklebuste57aed72009-08-09 15:14:26 -0400752static struct dentry *rpc_mkdir_populate(struct dentry *parent,
Al Viroa95e6912013-07-14 16:43:54 +0400753 const char *name, umode_t mode, void *private,
Trond Myklebuste57aed72009-08-09 15:14:26 -0400754 int (*populate)(struct dentry *, void *), void *args_populate)
Trond Myklebustf1345852005-09-23 11:08:25 -0400755{
Trond Myklebustf1345852005-09-23 11:08:25 -0400756 struct dentry *dentry;
David Howellsc5ef6032015-03-17 22:26:16 +0000757 struct inode *dir = d_inode(parent);
Trond Myklebustf1345852005-09-23 11:08:25 -0400758 int error;
759
Al Viro59551022016-01-22 15:40:57 -0500760 inode_lock_nested(dir, I_MUTEX_PARENT);
Trond Myklebust7d59d1e2009-08-09 15:14:23 -0400761 dentry = __rpc_lookup_create_exclusive(parent, name);
Trond Myklebustf1345852005-09-23 11:08:25 -0400762 if (IS_ERR(dentry))
Trond Myklebust7d59d1e2009-08-09 15:14:23 -0400763 goto out;
764 error = __rpc_mkdir(dir, dentry, mode, NULL, private);
Trond Myklebust75898062009-08-09 15:14:17 -0400765 if (error != 0)
766 goto out_err;
Trond Myklebuste57aed72009-08-09 15:14:26 -0400767 if (populate != NULL) {
768 error = populate(dentry, args_populate);
769 if (error)
770 goto err_rmdir;
771 }
Trond Myklebustf1345852005-09-23 11:08:25 -0400772out:
Al Viro59551022016-01-22 15:40:57 -0500773 inode_unlock(dir);
Trond Myklebust5c3e9852006-07-29 17:37:40 -0400774 return dentry;
Trond Myklebustac6fece2009-08-09 15:14:20 -0400775err_rmdir:
Trond Myklebustf1345852005-09-23 11:08:25 -0400776 __rpc_rmdir(dir, dentry);
Trond Myklebust75898062009-08-09 15:14:17 -0400777out_err:
Trond Myklebustf1345852005-09-23 11:08:25 -0400778 dentry = ERR_PTR(error);
779 goto out;
780}
781
Trond Myklebuste57aed72009-08-09 15:14:26 -0400782static int rpc_rmdir_depopulate(struct dentry *dentry,
783 void (*depopulate)(struct dentry *))
Trond Myklebustf1345852005-09-23 11:08:25 -0400784{
Trond Myklebustdff02cc2006-07-31 14:17:18 -0700785 struct dentry *parent;
Trond Myklebustf1345852005-09-23 11:08:25 -0400786 struct inode *dir;
787 int error;
788
Trond Myklebustdff02cc2006-07-31 14:17:18 -0700789 parent = dget_parent(dentry);
David Howellsc5ef6032015-03-17 22:26:16 +0000790 dir = d_inode(parent);
Al Viro59551022016-01-22 15:40:57 -0500791 inode_lock_nested(dir, I_MUTEX_PARENT);
Trond Myklebuste57aed72009-08-09 15:14:26 -0400792 if (depopulate != NULL)
793 depopulate(dentry);
Trond Myklebustf1345852005-09-23 11:08:25 -0400794 error = __rpc_rmdir(dir, dentry);
Al Viro59551022016-01-22 15:40:57 -0500795 inode_unlock(dir);
Trond Myklebustdff02cc2006-07-31 14:17:18 -0700796 dput(parent);
Trond Myklebustf1345852005-09-23 11:08:25 -0400797 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798}
799
J. Bruce Fields93a44a72007-11-06 13:06:03 -0500800/**
801 * rpc_mkpipe - make an rpc_pipefs file for kernel<->userspace communication
802 * @parent: dentry of directory to create new "pipe" in
803 * @name: name of pipe
804 * @private: private data to associate with the pipe, for the caller's use
Randy Dunlapbda14602012-05-13 10:35:40 -0700805 * @pipe: &rpc_pipe containing input parameters
J. Bruce Fields93a44a72007-11-06 13:06:03 -0500806 *
807 * Data is made available for userspace to read by calls to
808 * rpc_queue_upcall(). The actual reads will result in calls to
809 * @ops->upcall, which will be called with the file pointer,
810 * message, and userspace buffer to copy to.
811 *
812 * Writes can come at any time, and do not necessarily have to be
813 * responses to upcalls. They will result in calls to @msg->downcall.
814 *
815 * The @private argument passed here will be available to all these methods
Al Viro496ad9a2013-01-23 17:07:38 -0500816 * from the file pointer, via RPC_I(file_inode(file))->private.
J. Bruce Fields93a44a72007-11-06 13:06:03 -0500817 */
Stanislav Kinsburskyc239d832011-12-26 15:44:06 +0300818struct dentry *rpc_mkpipe_dentry(struct dentry *parent, const char *name,
819 void *private, struct rpc_pipe *pipe)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821 struct dentry *dentry;
David Howellsc5ef6032015-03-17 22:26:16 +0000822 struct inode *dir = d_inode(parent);
Trond Myklebust7364af62009-08-09 15:14:16 -0400823 umode_t umode = S_IFIFO | S_IRUSR | S_IWUSR;
Trond Myklebust75898062009-08-09 15:14:17 -0400824 int err;
Trond Myklebust7364af62009-08-09 15:14:16 -0400825
Stanislav Kinsburskyc239d832011-12-26 15:44:06 +0300826 if (pipe->ops->upcall == NULL)
Trond Myklebust7364af62009-08-09 15:14:16 -0400827 umode &= ~S_IRUGO;
Stanislav Kinsburskyc239d832011-12-26 15:44:06 +0300828 if (pipe->ops->downcall == NULL)
Trond Myklebust7364af62009-08-09 15:14:16 -0400829 umode &= ~S_IWUGO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830
Al Viro59551022016-01-22 15:40:57 -0500831 inode_lock_nested(dir, I_MUTEX_PARENT);
Al Virod3db90b2013-07-14 17:09:57 +0400832 dentry = __rpc_lookup_create_exclusive(parent, name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700833 if (IS_ERR(dentry))
Trond Myklebustcfeaa4a2009-08-09 15:14:20 -0400834 goto out;
Stanislav Kinsburskyc239d832011-12-26 15:44:06 +0300835 err = __rpc_mkpipe_dentry(dir, dentry, umode, &rpc_pipe_fops,
836 private, pipe);
Trond Myklebust75898062009-08-09 15:14:17 -0400837 if (err)
838 goto out_err;
Trond Myklebustf1345852005-09-23 11:08:25 -0400839out:
Al Viro59551022016-01-22 15:40:57 -0500840 inode_unlock(dir);
Trond Myklebust5c3e9852006-07-29 17:37:40 -0400841 return dentry;
Trond Myklebust75898062009-08-09 15:14:17 -0400842out_err:
843 dentry = ERR_PTR(err);
Al Viro1e903ed2013-09-16 10:57:41 -0400844 printk(KERN_WARNING "%s: %s() failed to create pipe %pd/%s (errno = %d)\n",
845 __FILE__, __func__, parent, name,
Trond Myklebust75898062009-08-09 15:14:17 -0400846 err);
Trond Myklebustf1345852005-09-23 11:08:25 -0400847 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700848}
Stanislav Kinsburskyc239d832011-12-26 15:44:06 +0300849EXPORT_SYMBOL_GPL(rpc_mkpipe_dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850
J. Bruce Fields93a44a72007-11-06 13:06:03 -0500851/**
852 * rpc_unlink - remove a pipe
853 * @dentry: dentry for the pipe, as returned from rpc_mkpipe
854 *
855 * After this call, lookups will no longer find the pipe, and any
856 * attempts to read or write using preexisting opens of the pipe will
857 * return -EPIPE.
858 */
Trond Myklebustf1345852005-09-23 11:08:25 -0400859int
Trond Myklebust5d674762006-07-31 14:11:48 -0700860rpc_unlink(struct dentry *dentry)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700861{
Trond Myklebust5d674762006-07-31 14:11:48 -0700862 struct dentry *parent;
Trond Myklebustf1345852005-09-23 11:08:25 -0400863 struct inode *dir;
Trond Myklebust5d674762006-07-31 14:11:48 -0700864 int error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865
Trond Myklebust5d674762006-07-31 14:11:48 -0700866 parent = dget_parent(dentry);
David Howellsc5ef6032015-03-17 22:26:16 +0000867 dir = d_inode(parent);
Al Viro59551022016-01-22 15:40:57 -0500868 inode_lock_nested(dir, I_MUTEX_PARENT);
Trond Myklebust810d90b2009-08-09 15:14:18 -0400869 error = __rpc_rmpipe(dir, dentry);
Al Viro59551022016-01-22 15:40:57 -0500870 inode_unlock(dir);
Trond Myklebust5d674762006-07-31 14:11:48 -0700871 dput(parent);
Trond Myklebustf1345852005-09-23 11:08:25 -0400872 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873}
Trond Myklebust468039e2008-12-23 15:21:31 -0500874EXPORT_SYMBOL_GPL(rpc_unlink);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875
Trond Myklebust6739ffb2013-08-26 15:38:11 -0400876/**
877 * rpc_init_pipe_dir_head - initialise a struct rpc_pipe_dir_head
878 * @pdh: pointer to struct rpc_pipe_dir_head
879 */
880void rpc_init_pipe_dir_head(struct rpc_pipe_dir_head *pdh)
881{
882 INIT_LIST_HEAD(&pdh->pdh_entries);
883 pdh->pdh_dentry = NULL;
884}
885EXPORT_SYMBOL_GPL(rpc_init_pipe_dir_head);
886
887/**
888 * rpc_init_pipe_dir_object - initialise a struct rpc_pipe_dir_object
889 * @pdo: pointer to struct rpc_pipe_dir_object
890 * @pdo_ops: pointer to const struct rpc_pipe_dir_object_ops
891 * @pdo_data: pointer to caller-defined data
892 */
893void rpc_init_pipe_dir_object(struct rpc_pipe_dir_object *pdo,
894 const struct rpc_pipe_dir_object_ops *pdo_ops,
895 void *pdo_data)
896{
897 INIT_LIST_HEAD(&pdo->pdo_head);
898 pdo->pdo_ops = pdo_ops;
899 pdo->pdo_data = pdo_data;
900}
901EXPORT_SYMBOL_GPL(rpc_init_pipe_dir_object);
902
903static int
904rpc_add_pipe_dir_object_locked(struct net *net,
905 struct rpc_pipe_dir_head *pdh,
906 struct rpc_pipe_dir_object *pdo)
907{
908 int ret = 0;
909
910 if (pdh->pdh_dentry)
911 ret = pdo->pdo_ops->create(pdh->pdh_dentry, pdo);
912 if (ret == 0)
913 list_add_tail(&pdo->pdo_head, &pdh->pdh_entries);
914 return ret;
915}
916
917static void
918rpc_remove_pipe_dir_object_locked(struct net *net,
919 struct rpc_pipe_dir_head *pdh,
920 struct rpc_pipe_dir_object *pdo)
921{
922 if (pdh->pdh_dentry)
923 pdo->pdo_ops->destroy(pdh->pdh_dentry, pdo);
924 list_del_init(&pdo->pdo_head);
925}
926
927/**
928 * rpc_add_pipe_dir_object - associate a rpc_pipe_dir_object to a directory
929 * @net: pointer to struct net
930 * @pdh: pointer to struct rpc_pipe_dir_head
931 * @pdo: pointer to struct rpc_pipe_dir_object
932 *
933 */
934int
935rpc_add_pipe_dir_object(struct net *net,
936 struct rpc_pipe_dir_head *pdh,
937 struct rpc_pipe_dir_object *pdo)
938{
939 int ret = 0;
940
941 if (list_empty(&pdo->pdo_head)) {
942 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
943
944 mutex_lock(&sn->pipefs_sb_lock);
945 ret = rpc_add_pipe_dir_object_locked(net, pdh, pdo);
946 mutex_unlock(&sn->pipefs_sb_lock);
947 }
948 return ret;
949}
950EXPORT_SYMBOL_GPL(rpc_add_pipe_dir_object);
951
952/**
953 * rpc_remove_pipe_dir_object - remove a rpc_pipe_dir_object from a directory
954 * @net: pointer to struct net
955 * @pdh: pointer to struct rpc_pipe_dir_head
956 * @pdo: pointer to struct rpc_pipe_dir_object
957 *
958 */
959void
960rpc_remove_pipe_dir_object(struct net *net,
961 struct rpc_pipe_dir_head *pdh,
962 struct rpc_pipe_dir_object *pdo)
963{
964 if (!list_empty(&pdo->pdo_head)) {
965 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
966
967 mutex_lock(&sn->pipefs_sb_lock);
968 rpc_remove_pipe_dir_object_locked(net, pdh, pdo);
969 mutex_unlock(&sn->pipefs_sb_lock);
970 }
971}
972EXPORT_SYMBOL_GPL(rpc_remove_pipe_dir_object);
973
Trond Myklebust298fc352013-08-27 16:27:04 -0400974/**
975 * rpc_find_or_alloc_pipe_dir_object
976 * @net: pointer to struct net
977 * @pdh: pointer to struct rpc_pipe_dir_head
978 * @match: match struct rpc_pipe_dir_object to data
979 * @alloc: allocate a new struct rpc_pipe_dir_object
980 * @data: user defined data for match() and alloc()
981 *
982 */
983struct rpc_pipe_dir_object *
984rpc_find_or_alloc_pipe_dir_object(struct net *net,
985 struct rpc_pipe_dir_head *pdh,
986 int (*match)(struct rpc_pipe_dir_object *, void *),
987 struct rpc_pipe_dir_object *(*alloc)(void *),
988 void *data)
989{
990 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
991 struct rpc_pipe_dir_object *pdo;
992
993 mutex_lock(&sn->pipefs_sb_lock);
994 list_for_each_entry(pdo, &pdh->pdh_entries, pdo_head) {
995 if (!match(pdo, data))
996 continue;
997 goto out;
998 }
999 pdo = alloc(data);
1000 if (!pdo)
1001 goto out;
1002 rpc_add_pipe_dir_object_locked(net, pdh, pdo);
1003out:
1004 mutex_unlock(&sn->pipefs_sb_lock);
1005 return pdo;
1006}
1007EXPORT_SYMBOL_GPL(rpc_find_or_alloc_pipe_dir_object);
1008
Trond Myklebust6739ffb2013-08-26 15:38:11 -04001009static void
1010rpc_create_pipe_dir_objects(struct rpc_pipe_dir_head *pdh)
1011{
1012 struct rpc_pipe_dir_object *pdo;
1013 struct dentry *dir = pdh->pdh_dentry;
1014
1015 list_for_each_entry(pdo, &pdh->pdh_entries, pdo_head)
1016 pdo->pdo_ops->create(dir, pdo);
1017}
1018
1019static void
1020rpc_destroy_pipe_dir_objects(struct rpc_pipe_dir_head *pdh)
1021{
1022 struct rpc_pipe_dir_object *pdo;
1023 struct dentry *dir = pdh->pdh_dentry;
1024
1025 list_for_each_entry(pdo, &pdh->pdh_entries, pdo_head)
1026 pdo->pdo_ops->destroy(dir, pdo);
1027}
1028
Trond Myklebuste57aed72009-08-09 15:14:26 -04001029enum {
1030 RPCAUTH_info,
1031 RPCAUTH_EOF
1032};
1033
1034static const struct rpc_filelist authfiles[] = {
1035 [RPCAUTH_info] = {
1036 .name = "info",
1037 .i_fop = &rpc_info_operations,
1038 .mode = S_IFREG | S_IRUSR,
1039 },
1040};
1041
1042static int rpc_clntdir_populate(struct dentry *dentry, void *private)
1043{
1044 return rpc_populate(dentry,
1045 authfiles, RPCAUTH_info, RPCAUTH_EOF,
1046 private);
1047}
1048
1049static void rpc_clntdir_depopulate(struct dentry *dentry)
1050{
1051 rpc_depopulate(dentry, authfiles, RPCAUTH_info, RPCAUTH_EOF);
1052}
1053
Trond Myklebust7d59d1e2009-08-09 15:14:23 -04001054/**
1055 * rpc_create_client_dir - Create a new rpc_client directory in rpc_pipefs
Al Viroa95e6912013-07-14 16:43:54 +04001056 * @dentry: the parent of new directory
1057 * @name: the name of new directory
Trond Myklebust7d59d1e2009-08-09 15:14:23 -04001058 * @rpc_client: rpc client to associate with this directory
1059 *
1060 * This creates a directory at the given @path associated with
1061 * @rpc_clnt, which will contain a file named "info" with some basic
1062 * information about the client, together with any "pipes" that may
1063 * later be created using rpc_mkpipe().
1064 */
Trond Myklebust23ac6582009-08-09 15:14:25 -04001065struct dentry *rpc_create_client_dir(struct dentry *dentry,
Al Viroa95e6912013-07-14 16:43:54 +04001066 const char *name,
Trond Myklebuste57aed72009-08-09 15:14:26 -04001067 struct rpc_clnt *rpc_client)
Trond Myklebust7d59d1e2009-08-09 15:14:23 -04001068{
Trond Myklebust6739ffb2013-08-26 15:38:11 -04001069 struct dentry *ret;
1070
1071 ret = rpc_mkdir_populate(dentry, name, S_IRUGO | S_IXUGO, NULL,
Trond Myklebuste57aed72009-08-09 15:14:26 -04001072 rpc_clntdir_populate, rpc_client);
Trond Myklebust6739ffb2013-08-26 15:38:11 -04001073 if (!IS_ERR(ret)) {
1074 rpc_client->cl_pipedir_objects.pdh_dentry = ret;
1075 rpc_create_pipe_dir_objects(&rpc_client->cl_pipedir_objects);
1076 }
1077 return ret;
Trond Myklebuste57aed72009-08-09 15:14:26 -04001078}
1079
1080/**
1081 * rpc_remove_client_dir - Remove a directory created with rpc_create_client_dir()
Trond Myklebust6739ffb2013-08-26 15:38:11 -04001082 * @rpc_client: rpc_client for the pipe
Trond Myklebuste57aed72009-08-09 15:14:26 -04001083 */
Trond Myklebustc36dcfe12013-08-26 17:44:26 -04001084int rpc_remove_client_dir(struct rpc_clnt *rpc_client)
Trond Myklebuste57aed72009-08-09 15:14:26 -04001085{
Trond Myklebustc36dcfe12013-08-26 17:44:26 -04001086 struct dentry *dentry = rpc_client->cl_pipedir_objects.pdh_dentry;
1087
1088 if (dentry == NULL)
1089 return 0;
1090 rpc_destroy_pipe_dir_objects(&rpc_client->cl_pipedir_objects);
1091 rpc_client->cl_pipedir_objects.pdh_dentry = NULL;
Trond Myklebuste57aed72009-08-09 15:14:26 -04001092 return rpc_rmdir_depopulate(dentry, rpc_clntdir_depopulate);
Trond Myklebust7d59d1e2009-08-09 15:14:23 -04001093}
1094
Trond Myklebust8854e822009-08-09 15:14:30 -04001095static const struct rpc_filelist cache_pipefs_files[3] = {
1096 [0] = {
1097 .name = "channel",
1098 .i_fop = &cache_file_operations_pipefs,
Trond Myklebust96c61cb2009-08-19 18:12:21 -04001099 .mode = S_IFREG|S_IRUSR|S_IWUSR,
Trond Myklebust8854e822009-08-09 15:14:30 -04001100 },
1101 [1] = {
1102 .name = "content",
1103 .i_fop = &content_file_operations_pipefs,
1104 .mode = S_IFREG|S_IRUSR,
1105 },
1106 [2] = {
1107 .name = "flush",
1108 .i_fop = &cache_flush_operations_pipefs,
1109 .mode = S_IFREG|S_IRUSR|S_IWUSR,
1110 },
1111};
1112
1113static int rpc_cachedir_populate(struct dentry *dentry, void *private)
1114{
1115 return rpc_populate(dentry,
1116 cache_pipefs_files, 0, 3,
1117 private);
1118}
1119
1120static void rpc_cachedir_depopulate(struct dentry *dentry)
1121{
1122 rpc_depopulate(dentry, cache_pipefs_files, 0, 3);
1123}
1124
Al Viroa95e6912013-07-14 16:43:54 +04001125struct dentry *rpc_create_cache_dir(struct dentry *parent, const char *name,
Al Viro64f14262011-07-25 00:35:13 -04001126 umode_t umode, struct cache_detail *cd)
Trond Myklebust8854e822009-08-09 15:14:30 -04001127{
1128 return rpc_mkdir_populate(parent, name, umode, NULL,
1129 rpc_cachedir_populate, cd);
1130}
1131
1132void rpc_remove_cache_dir(struct dentry *dentry)
1133{
1134 rpc_rmdir_depopulate(dentry, rpc_cachedir_depopulate);
1135}
1136
Linus Torvalds1da177e2005-04-16 15:20:36 -07001137/*
1138 * populate the filesystem
1139 */
Alexey Dobriyanb87221d2009-09-21 17:01:09 -07001140static const struct super_operations s_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001141 .alloc_inode = rpc_alloc_inode,
1142 .destroy_inode = rpc_destroy_inode,
1143 .statfs = simple_statfs,
1144};
1145
1146#define RPCAUTH_GSSMAGIC 0x67596969
1147
Trond Myklebustbb156742009-08-09 15:14:21 -04001148/*
1149 * We have a single directory with 1 node in it.
1150 */
1151enum {
1152 RPCAUTH_lockd,
1153 RPCAUTH_mount,
1154 RPCAUTH_nfs,
1155 RPCAUTH_portmap,
1156 RPCAUTH_statd,
1157 RPCAUTH_nfsd4_cb,
Trond Myklebuste571cbf2009-08-19 18:12:27 -04001158 RPCAUTH_cache,
Jeff Laytonb3537c32012-03-21 09:52:04 -04001159 RPCAUTH_nfsd,
Jeff Layton4b9a4452013-11-14 07:25:17 -05001160 RPCAUTH_gssd,
Trond Myklebustbb156742009-08-09 15:14:21 -04001161 RPCAUTH_RootEOF
1162};
1163
1164static const struct rpc_filelist files[] = {
1165 [RPCAUTH_lockd] = {
1166 .name = "lockd",
1167 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
1168 },
1169 [RPCAUTH_mount] = {
1170 .name = "mount",
1171 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
1172 },
1173 [RPCAUTH_nfs] = {
1174 .name = "nfs",
1175 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
1176 },
1177 [RPCAUTH_portmap] = {
1178 .name = "portmap",
1179 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
1180 },
1181 [RPCAUTH_statd] = {
1182 .name = "statd",
1183 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
1184 },
1185 [RPCAUTH_nfsd4_cb] = {
1186 .name = "nfsd4_cb",
1187 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
1188 },
Trond Myklebuste571cbf2009-08-19 18:12:27 -04001189 [RPCAUTH_cache] = {
1190 .name = "cache",
1191 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
1192 },
Jeff Laytonb3537c32012-03-21 09:52:04 -04001193 [RPCAUTH_nfsd] = {
1194 .name = "nfsd",
1195 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
1196 },
Jeff Layton4b9a4452013-11-14 07:25:17 -05001197 [RPCAUTH_gssd] = {
1198 .name = "gssd",
1199 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
1200 },
Trond Myklebustbb156742009-08-09 15:14:21 -04001201};
1202
Stanislav Kinsbursky432eb1a2011-12-26 15:39:22 +03001203/*
1204 * This call can be used only in RPC pipefs mount notification hooks.
1205 */
1206struct dentry *rpc_d_lookup_sb(const struct super_block *sb,
1207 const unsigned char *dir_name)
1208{
Linus Torvalds26fe5752012-05-10 13:14:12 -07001209 struct qstr dir = QSTR_INIT(dir_name, strlen(dir_name));
Al Virod3db90b2013-07-14 17:09:57 +04001210 return d_hash_and_lookup(sb->s_root, &dir);
Stanislav Kinsbursky432eb1a2011-12-26 15:39:22 +03001211}
1212EXPORT_SYMBOL_GPL(rpc_d_lookup_sb);
1213
Jeff Layton4b9a4452013-11-14 07:25:17 -05001214int rpc_pipefs_init_net(struct net *net)
Stanislav Kinsburskyc21a5882011-12-26 15:39:39 +03001215{
1216 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1217
Jeff Layton4b9a4452013-11-14 07:25:17 -05001218 sn->gssd_dummy = rpc_mkpipe_data(&gssd_dummy_pipe_ops, 0);
1219 if (IS_ERR(sn->gssd_dummy))
1220 return PTR_ERR(sn->gssd_dummy);
1221
Stanislav Kinsburskyc21a5882011-12-26 15:39:39 +03001222 mutex_init(&sn->pipefs_sb_lock);
Trond Myklebust2aed8b42013-05-15 10:27:32 -07001223 sn->pipe_version = -1;
Jeff Layton4b9a4452013-11-14 07:25:17 -05001224 return 0;
1225}
1226
1227void rpc_pipefs_exit_net(struct net *net)
1228{
1229 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1230
1231 rpc_destroy_pipe_data(sn->gssd_dummy);
Stanislav Kinsburskyc21a5882011-12-26 15:39:39 +03001232}
1233
1234/*
1235 * This call will be used for per network namespace operations calls.
1236 * Note: Function will be returned with pipefs_sb_lock taken if superblock was
1237 * found. This lock have to be released by rpc_put_sb_net() when all operations
1238 * will be completed.
1239 */
1240struct super_block *rpc_get_sb_net(const struct net *net)
1241{
1242 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1243
1244 mutex_lock(&sn->pipefs_sb_lock);
1245 if (sn->pipefs_sb)
1246 return sn->pipefs_sb;
1247 mutex_unlock(&sn->pipefs_sb_lock);
1248 return NULL;
1249}
1250EXPORT_SYMBOL_GPL(rpc_get_sb_net);
1251
1252void rpc_put_sb_net(const struct net *net)
1253{
1254 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1255
Weston Andros Adamson749386e2012-10-23 10:43:37 -04001256 WARN_ON(sn->pipefs_sb == NULL);
Stanislav Kinsburskyc21a5882011-12-26 15:39:39 +03001257 mutex_unlock(&sn->pipefs_sb_lock);
1258}
1259EXPORT_SYMBOL_GPL(rpc_put_sb_net);
1260
Jeff Layton4b9a4452013-11-14 07:25:17 -05001261static const struct rpc_filelist gssd_dummy_clnt_dir[] = {
1262 [0] = {
1263 .name = "clntXX",
1264 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
1265 },
1266};
1267
1268static ssize_t
1269dummy_downcall(struct file *filp, const char __user *src, size_t len)
1270{
1271 return -EINVAL;
1272}
1273
1274static const struct rpc_pipe_ops gssd_dummy_pipe_ops = {
1275 .upcall = rpc_pipe_generic_upcall,
1276 .downcall = dummy_downcall,
1277};
1278
Jeff Laytone2f0c832013-12-05 07:34:44 -05001279/*
1280 * Here we present a bogus "info" file to keep rpc.gssd happy. We don't expect
1281 * that it will ever use this info to handle an upcall, but rpc.gssd expects
1282 * that this file will be there and have a certain format.
1283 */
1284static int
1285rpc_show_dummy_info(struct seq_file *m, void *v)
1286{
1287 seq_printf(m, "RPC server: %s\n", utsname()->nodename);
1288 seq_printf(m, "service: foo (1) version 0\n");
1289 seq_printf(m, "address: 127.0.0.1\n");
1290 seq_printf(m, "protocol: tcp\n");
1291 seq_printf(m, "port: 0\n");
1292 return 0;
1293}
1294
1295static int
1296rpc_dummy_info_open(struct inode *inode, struct file *file)
1297{
1298 return single_open(file, rpc_show_dummy_info, NULL);
1299}
1300
1301static const struct file_operations rpc_dummy_info_operations = {
1302 .owner = THIS_MODULE,
1303 .open = rpc_dummy_info_open,
1304 .read = seq_read,
1305 .llseek = seq_lseek,
1306 .release = single_release,
1307};
1308
1309static const struct rpc_filelist gssd_dummy_info_file[] = {
1310 [0] = {
1311 .name = "info",
1312 .i_fop = &rpc_dummy_info_operations,
1313 .mode = S_IFREG | S_IRUSR,
1314 },
1315};
1316
Jeff Layton4b9a4452013-11-14 07:25:17 -05001317/**
1318 * rpc_gssd_dummy_populate - create a dummy gssd pipe
1319 * @root: root of the rpc_pipefs filesystem
1320 * @pipe_data: pipe data created when netns is initialized
1321 *
1322 * Create a dummy set of directories and a pipe that gssd can hold open to
1323 * indicate that it is up and running.
1324 */
1325static struct dentry *
1326rpc_gssd_dummy_populate(struct dentry *root, struct rpc_pipe *pipe_data)
1327{
1328 int ret = 0;
1329 struct dentry *gssd_dentry;
1330 struct dentry *clnt_dentry = NULL;
1331 struct dentry *pipe_dentry = NULL;
1332 struct qstr q = QSTR_INIT(files[RPCAUTH_gssd].name,
1333 strlen(files[RPCAUTH_gssd].name));
1334
1335 /* We should never get this far if "gssd" doesn't exist */
1336 gssd_dentry = d_hash_and_lookup(root, &q);
1337 if (!gssd_dentry)
1338 return ERR_PTR(-ENOENT);
1339
1340 ret = rpc_populate(gssd_dentry, gssd_dummy_clnt_dir, 0, 1, NULL);
1341 if (ret) {
1342 pipe_dentry = ERR_PTR(ret);
1343 goto out;
1344 }
1345
1346 q.name = gssd_dummy_clnt_dir[0].name;
1347 q.len = strlen(gssd_dummy_clnt_dir[0].name);
1348 clnt_dentry = d_hash_and_lookup(gssd_dentry, &q);
1349 if (!clnt_dentry) {
1350 pipe_dentry = ERR_PTR(-ENOENT);
1351 goto out;
1352 }
1353
Jeff Laytone2f0c832013-12-05 07:34:44 -05001354 ret = rpc_populate(clnt_dentry, gssd_dummy_info_file, 0, 1, NULL);
1355 if (ret) {
Jeff Layton3396f922013-12-05 07:33:49 -05001356 __rpc_depopulate(gssd_dentry, gssd_dummy_clnt_dir, 0, 1);
Jeff Laytone2f0c832013-12-05 07:34:44 -05001357 pipe_dentry = ERR_PTR(ret);
1358 goto out;
1359 }
1360
1361 pipe_dentry = rpc_mkpipe_dentry(clnt_dentry, "gssd", NULL, pipe_data);
1362 if (IS_ERR(pipe_dentry)) {
1363 __rpc_depopulate(clnt_dentry, gssd_dummy_info_file, 0, 1);
1364 __rpc_depopulate(gssd_dentry, gssd_dummy_clnt_dir, 0, 1);
1365 }
Jeff Layton4b9a4452013-11-14 07:25:17 -05001366out:
1367 dput(clnt_dentry);
1368 dput(gssd_dentry);
1369 return pipe_dentry;
1370}
1371
Jeff Layton23e66ba2013-12-09 09:38:00 -05001372static void
1373rpc_gssd_dummy_depopulate(struct dentry *pipe_dentry)
1374{
1375 struct dentry *clnt_dir = pipe_dentry->d_parent;
1376 struct dentry *gssd_dir = clnt_dir->d_parent;
1377
David Howellsc5ef6032015-03-17 22:26:16 +00001378 __rpc_rmpipe(d_inode(clnt_dir), pipe_dentry);
Jeff Layton23e66ba2013-12-09 09:38:00 -05001379 __rpc_depopulate(clnt_dir, gssd_dummy_info_file, 0, 1);
1380 __rpc_depopulate(gssd_dir, gssd_dummy_clnt_dir, 0, 1);
1381 dput(pipe_dentry);
1382}
1383
Linus Torvalds1da177e2005-04-16 15:20:36 -07001384static int
1385rpc_fill_super(struct super_block *sb, void *data, int silent)
1386{
1387 struct inode *inode;
Jeff Layton4b9a4452013-11-14 07:25:17 -05001388 struct dentry *root, *gssd_dentry;
Eric W. Biedermand91ee872016-05-23 14:51:59 -05001389 struct net *net = get_net(sb->s_fs_info);
Stanislav Kinsbursky90c4e822011-12-26 15:39:30 +03001390 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
Stanislav Kinsbursky2d001312011-12-26 15:39:13 +03001391 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001392
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +03001393 sb->s_blocksize = PAGE_SIZE;
1394 sb->s_blocksize_bits = PAGE_SHIFT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001395 sb->s_magic = RPCAUTH_GSSMAGIC;
1396 sb->s_op = &s_ops;
Al Virob26d4cd2013-10-25 18:47:37 -04001397 sb->s_d_op = &simple_dentry_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001398 sb->s_time_gran = 1;
1399
Jeff Layton7e450b42012-05-16 13:04:26 -04001400 inode = rpc_get_inode(sb, S_IFDIR | S_IRUGO | S_IXUGO);
Al Viro48fde702012-01-08 22:15:13 -05001401 sb->s_root = root = d_make_root(inode);
1402 if (!root)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001403 return -ENOMEM;
Trond Myklebustac6fece2009-08-09 15:14:20 -04001404 if (rpc_populate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF, NULL))
Al Virofc7bed82010-01-25 18:30:38 -05001405 return -ENOMEM;
Jeff Layton4b9a4452013-11-14 07:25:17 -05001406
1407 gssd_dentry = rpc_gssd_dummy_populate(root, sn->gssd_dummy);
1408 if (IS_ERR(gssd_dentry)) {
1409 __rpc_depopulate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF);
1410 return PTR_ERR(gssd_dentry);
1411 }
1412
Chuck Leverd8af9bc12012-09-14 17:23:34 -04001413 dprintk("RPC: sending pipefs MOUNT notification for net %p%s\n",
1414 net, NET_NAME(net));
Stanislav Kinsbursky38481602013-06-24 11:52:38 +04001415 mutex_lock(&sn->pipefs_sb_lock);
Stanislav Kinsbursky37629b52012-04-20 18:19:56 +04001416 sn->pipefs_sb = sb;
Stanislav Kinsbursky2d001312011-12-26 15:39:13 +03001417 err = blocking_notifier_call_chain(&rpc_pipefs_notifier_list,
1418 RPC_PIPEFS_MOUNT,
1419 sb);
1420 if (err)
1421 goto err_depopulate;
Stanislav Kinsbursky38481602013-06-24 11:52:38 +04001422 mutex_unlock(&sn->pipefs_sb_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001423 return 0;
Stanislav Kinsbursky2d001312011-12-26 15:39:13 +03001424
1425err_depopulate:
Jeff Layton23e66ba2013-12-09 09:38:00 -05001426 rpc_gssd_dummy_depopulate(gssd_dentry);
Stanislav Kinsbursky2d001312011-12-26 15:39:13 +03001427 blocking_notifier_call_chain(&rpc_pipefs_notifier_list,
1428 RPC_PIPEFS_UMOUNT,
1429 sb);
Stanislav Kinsbursky37629b52012-04-20 18:19:56 +04001430 sn->pipefs_sb = NULL;
Stanislav Kinsbursky2d001312011-12-26 15:39:13 +03001431 __rpc_depopulate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF);
Stanislav Kinsbursky38481602013-06-24 11:52:38 +04001432 mutex_unlock(&sn->pipefs_sb_lock);
Stanislav Kinsbursky2d001312011-12-26 15:39:13 +03001433 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001434}
1435
Jeff Layton89f84242013-11-14 07:25:18 -05001436bool
1437gssd_running(struct net *net)
1438{
1439 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1440 struct rpc_pipe *pipe = sn->gssd_dummy;
1441
1442 return pipe->nreaders || pipe->nwriters;
1443}
1444EXPORT_SYMBOL_GPL(gssd_running);
1445
Al Virofc14f2f2010-07-25 01:48:30 +04001446static struct dentry *
1447rpc_mount(struct file_system_type *fs_type,
1448 int flags, const char *dev_name, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001449{
Eric W. Biedermand91ee872016-05-23 14:51:59 -05001450 struct net *net = current->nsproxy->net_ns;
1451 return mount_ns(fs_type, flags, data, net, net->user_ns, rpc_fill_super);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001452}
1453
Trond Myklebust09acfea2012-03-11 15:22:54 -04001454static void rpc_kill_sb(struct super_block *sb)
Stanislav Kinsbursky021c68d2011-12-26 15:39:04 +03001455{
1456 struct net *net = sb->s_fs_info;
Stanislav Kinsbursky90c4e822011-12-26 15:39:30 +03001457 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
Stanislav Kinsbursky021c68d2011-12-26 15:39:04 +03001458
Stanislav Kinsburskyc21a5882011-12-26 15:39:39 +03001459 mutex_lock(&sn->pipefs_sb_lock);
Trond Myklebust642fe4d2012-11-08 10:01:26 -05001460 if (sn->pipefs_sb != sb) {
1461 mutex_unlock(&sn->pipefs_sb_lock);
1462 goto out;
1463 }
Stanislav Kinsbursky90c4e822011-12-26 15:39:30 +03001464 sn->pipefs_sb = NULL;
Chuck Leverd8af9bc12012-09-14 17:23:34 -04001465 dprintk("RPC: sending pipefs UMOUNT notification for net %p%s\n",
1466 net, NET_NAME(net));
Stanislav Kinsbursky2d001312011-12-26 15:39:13 +03001467 blocking_notifier_call_chain(&rpc_pipefs_notifier_list,
1468 RPC_PIPEFS_UMOUNT,
1469 sb);
Stanislav Kinsburskyadb6fa72013-06-26 10:15:14 +04001470 mutex_unlock(&sn->pipefs_sb_lock);
Trond Myklebust642fe4d2012-11-08 10:01:26 -05001471out:
Stanislav Kinsbursky021c68d2011-12-26 15:39:04 +03001472 kill_litter_super(sb);
Eric W. Biedermand91ee872016-05-23 14:51:59 -05001473 put_net(net);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001474}
1475
1476static struct file_system_type rpc_pipe_fs_type = {
1477 .owner = THIS_MODULE,
1478 .name = "rpc_pipefs",
Al Virofc14f2f2010-07-25 01:48:30 +04001479 .mount = rpc_mount,
Stanislav Kinsbursky021c68d2011-12-26 15:39:04 +03001480 .kill_sb = rpc_kill_sb,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001481};
Eric W. Biederman7f78e032013-03-02 19:39:14 -08001482MODULE_ALIAS_FS("rpc_pipefs");
Eric W. Biedermanfa7614dd2013-03-12 18:27:41 -07001483MODULE_ALIAS("rpc_pipefs");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001484
1485static void
Alexey Dobriyan51cc5062008-07-25 19:45:34 -07001486init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001487{
1488 struct rpc_inode *rpci = (struct rpc_inode *) foo;
1489
Christoph Lametera35afb82007-05-16 22:10:57 -07001490 inode_init_once(&rpci->vfs_inode);
1491 rpci->private = NULL;
Stanislav Kinsburskyba9e0972011-12-26 15:43:32 +03001492 rpci->pipe = NULL;
Christoph Lametera35afb82007-05-16 22:10:57 -07001493 init_waitqueue_head(&rpci->waitq);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001494}
1495
1496int register_rpc_pipefs(void)
1497{
Akinobu Mita5bd5f582007-05-09 02:34:51 -07001498 int err;
1499
Linus Torvalds1da177e2005-04-16 15:20:36 -07001500 rpc_inode_cachep = kmem_cache_create("rpc_inode_cache",
Paul Jacksonfffb60f2006-03-24 03:16:06 -08001501 sizeof(struct rpc_inode),
1502 0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
Vladimir Davydov5d097052016-01-14 15:18:21 -08001503 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
Paul Mundt20c2df82007-07-20 10:11:58 +09001504 init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001505 if (!rpc_inode_cachep)
1506 return -ENOMEM;
Stanislav Kinsbursky80df9d22012-01-11 19:18:17 +04001507 err = rpc_clients_notifier_register();
1508 if (err)
1509 goto err_notifier;
Akinobu Mita5bd5f582007-05-09 02:34:51 -07001510 err = register_filesystem(&rpc_pipe_fs_type);
Stanislav Kinsbursky80df9d22012-01-11 19:18:17 +04001511 if (err)
1512 goto err_register;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001513 return 0;
Stanislav Kinsbursky80df9d22012-01-11 19:18:17 +04001514
1515err_register:
1516 rpc_clients_notifier_unregister();
1517err_notifier:
1518 kmem_cache_destroy(rpc_inode_cachep);
1519 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001520}
1521
1522void unregister_rpc_pipefs(void)
1523{
Stanislav Kinsbursky80df9d22012-01-11 19:18:17 +04001524 rpc_clients_notifier_unregister();
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -07001525 kmem_cache_destroy(rpc_inode_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001526 unregister_filesystem(&rpc_pipe_fs_type);
1527}