2 * net/sunrpc/rpc_pipe.c
4 * Userland/kernel interface for rpcauth_gss.
5 * Code shamelessly plagiarized from fs/nfsd/nfsctl.c
8 * Copyright (c) 2002, Trond Myklebust <trond.myklebust@fys.uio.no>
11 #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>
17 #include <linux/fsnotify.h>
18 #include <linux/kernel.h>
19 #include <linux/rcupdate.h>
21 #include <asm/ioctls.h>
22 #include <linux/poll.h>
23 #include <linux/wait.h>
24 #include <linux/seq_file.h>
26 #include <linux/sunrpc/clnt.h>
27 #include <linux/workqueue.h>
28 #include <linux/sunrpc/rpc_pipe_fs.h>
29 #include <linux/sunrpc/cache.h>
30 #include <linux/nsproxy.h>
31 #include <linux/notifier.h>
36 #define RPCDBG_FACILITY RPCDBG_DEBUG
38 #define NET_NAME(net) ((net == &init_net) ? " (init_net)" : "")
40 static struct file_system_type rpc_pipe_fs_type;
43 static struct kmem_cache *rpc_inode_cachep __read_mostly;
45 #define RPC_UPCALL_TIMEOUT (30*HZ)
47 static BLOCKING_NOTIFIER_HEAD(rpc_pipefs_notifier_list);
49 int rpc_pipefs_notifier_register(struct notifier_block *nb)
51 return blocking_notifier_chain_cond_register(&rpc_pipefs_notifier_list, nb);
53 EXPORT_SYMBOL_GPL(rpc_pipefs_notifier_register);
55 void rpc_pipefs_notifier_unregister(struct notifier_block *nb)
57 blocking_notifier_chain_unregister(&rpc_pipefs_notifier_list, nb);
59 EXPORT_SYMBOL_GPL(rpc_pipefs_notifier_unregister);
61 static void rpc_purge_list(wait_queue_head_t *waitq, struct list_head *head,
62 void (*destroy_msg)(struct rpc_pipe_msg *), int err)
64 struct rpc_pipe_msg *msg;
69 msg = list_entry(head->next, struct rpc_pipe_msg, list);
70 list_del_init(&msg->list);
73 } while (!list_empty(head));
80 rpc_timeout_upcall_queue(struct work_struct *work)
83 struct rpc_pipe *pipe =
84 container_of(work, struct rpc_pipe, queue_timeout.work);
85 void (*destroy_msg)(struct rpc_pipe_msg *);
86 struct dentry *dentry;
88 spin_lock(&pipe->lock);
89 destroy_msg = pipe->ops->destroy_msg;
90 if (pipe->nreaders == 0) {
91 list_splice_init(&pipe->pipe, &free_list);
94 dentry = dget(pipe->dentry);
95 spin_unlock(&pipe->lock);
96 rpc_purge_list(dentry ? &RPC_I(dentry->d_inode)->waitq : NULL,
97 &free_list, destroy_msg, -ETIMEDOUT);
101 ssize_t rpc_pipe_generic_upcall(struct file *filp, struct rpc_pipe_msg *msg,
102 char __user *dst, size_t buflen)
104 char *data = (char *)msg->data + msg->copied;
105 size_t mlen = min(msg->len - msg->copied, buflen);
108 left = copy_to_user(dst, data, mlen);
110 msg->errno = -EFAULT;
119 EXPORT_SYMBOL_GPL(rpc_pipe_generic_upcall);
122 * rpc_queue_upcall - queue an upcall message to userspace
123 * @pipe: upcall pipe on which to queue given message
124 * @msg: message to queue
126 * Call with an @inode created by rpc_mkpipe() to queue an upcall.
127 * A userspace process may then later read the upcall by performing a
128 * read on an open file for this inode. It is up to the caller to
129 * initialize the fields of @msg (other than @msg->list) appropriately.
132 rpc_queue_upcall(struct rpc_pipe *pipe, struct rpc_pipe_msg *msg)
135 struct dentry *dentry;
137 spin_lock(&pipe->lock);
138 if (pipe->nreaders) {
139 list_add_tail(&msg->list, &pipe->pipe);
140 pipe->pipelen += msg->len;
142 } else if (pipe->flags & RPC_PIPE_WAIT_FOR_OPEN) {
143 if (list_empty(&pipe->pipe))
144 queue_delayed_work(rpciod_workqueue,
145 &pipe->queue_timeout,
147 list_add_tail(&msg->list, &pipe->pipe);
148 pipe->pipelen += msg->len;
151 dentry = dget(pipe->dentry);
152 spin_unlock(&pipe->lock);
154 wake_up(&RPC_I(dentry->d_inode)->waitq);
159 EXPORT_SYMBOL_GPL(rpc_queue_upcall);
162 rpc_inode_setowner(struct inode *inode, void *private)
164 RPC_I(inode)->private = private;
168 rpc_close_pipes(struct inode *inode)
170 struct rpc_pipe *pipe = RPC_I(inode)->pipe;
172 LIST_HEAD(free_list);
174 mutex_lock(&inode->i_mutex);
175 spin_lock(&pipe->lock);
176 need_release = pipe->nreaders != 0 || pipe->nwriters != 0;
178 list_splice_init(&pipe->in_upcall, &free_list);
179 list_splice_init(&pipe->pipe, &free_list);
182 spin_unlock(&pipe->lock);
183 rpc_purge_list(&RPC_I(inode)->waitq, &free_list, pipe->ops->destroy_msg, -EPIPE);
185 if (need_release && pipe->ops->release_pipe)
186 pipe->ops->release_pipe(inode);
187 cancel_delayed_work_sync(&pipe->queue_timeout);
188 rpc_inode_setowner(inode, NULL);
189 RPC_I(inode)->pipe = NULL;
190 mutex_unlock(&inode->i_mutex);
193 static struct inode *
194 rpc_alloc_inode(struct super_block *sb)
196 struct rpc_inode *rpci;
197 rpci = (struct rpc_inode *)kmem_cache_alloc(rpc_inode_cachep, GFP_KERNEL);
200 return &rpci->vfs_inode;
204 rpc_i_callback(struct rcu_head *head)
206 struct inode *inode = container_of(head, struct inode, i_rcu);
207 kmem_cache_free(rpc_inode_cachep, RPC_I(inode));
211 rpc_destroy_inode(struct inode *inode)
213 call_rcu(&inode->i_rcu, rpc_i_callback);
217 rpc_pipe_open(struct inode *inode, struct file *filp)
219 struct net *net = inode->i_sb->s_fs_info;
220 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
221 struct rpc_pipe *pipe;
225 mutex_lock(&inode->i_mutex);
226 sn->gssd_running = 1;
227 pipe = RPC_I(inode)->pipe;
230 first_open = pipe->nreaders == 0 && pipe->nwriters == 0;
231 if (first_open && pipe->ops->open_pipe) {
232 res = pipe->ops->open_pipe(inode);
236 if (filp->f_mode & FMODE_READ)
238 if (filp->f_mode & FMODE_WRITE)
242 mutex_unlock(&inode->i_mutex);
247 rpc_pipe_release(struct inode *inode, struct file *filp)
249 struct rpc_pipe *pipe;
250 struct rpc_pipe_msg *msg;
253 mutex_lock(&inode->i_mutex);
254 pipe = RPC_I(inode)->pipe;
257 msg = filp->private_data;
259 spin_lock(&pipe->lock);
260 msg->errno = -EAGAIN;
261 list_del_init(&msg->list);
262 spin_unlock(&pipe->lock);
263 pipe->ops->destroy_msg(msg);
265 if (filp->f_mode & FMODE_WRITE)
267 if (filp->f_mode & FMODE_READ) {
269 if (pipe->nreaders == 0) {
270 LIST_HEAD(free_list);
271 spin_lock(&pipe->lock);
272 list_splice_init(&pipe->pipe, &free_list);
274 spin_unlock(&pipe->lock);
275 rpc_purge_list(&RPC_I(inode)->waitq, &free_list,
276 pipe->ops->destroy_msg, -EAGAIN);
279 last_close = pipe->nwriters == 0 && pipe->nreaders == 0;
280 if (last_close && pipe->ops->release_pipe)
281 pipe->ops->release_pipe(inode);
283 mutex_unlock(&inode->i_mutex);
288 rpc_pipe_read(struct file *filp, char __user *buf, size_t len, loff_t *offset)
290 struct inode *inode = file_inode(filp);
291 struct rpc_pipe *pipe;
292 struct rpc_pipe_msg *msg;
295 mutex_lock(&inode->i_mutex);
296 pipe = RPC_I(inode)->pipe;
301 msg = filp->private_data;
303 spin_lock(&pipe->lock);
304 if (!list_empty(&pipe->pipe)) {
305 msg = list_entry(pipe->pipe.next,
308 list_move(&msg->list, &pipe->in_upcall);
309 pipe->pipelen -= msg->len;
310 filp->private_data = msg;
313 spin_unlock(&pipe->lock);
317 /* NOTE: it is up to the callback to update msg->copied */
318 res = pipe->ops->upcall(filp, msg, buf, len);
319 if (res < 0 || msg->len == msg->copied) {
320 filp->private_data = NULL;
321 spin_lock(&pipe->lock);
322 list_del_init(&msg->list);
323 spin_unlock(&pipe->lock);
324 pipe->ops->destroy_msg(msg);
327 mutex_unlock(&inode->i_mutex);
332 rpc_pipe_write(struct file *filp, const char __user *buf, size_t len, loff_t *offset)
334 struct inode *inode = file_inode(filp);
337 mutex_lock(&inode->i_mutex);
339 if (RPC_I(inode)->pipe != NULL)
340 res = RPC_I(inode)->pipe->ops->downcall(filp, buf, len);
341 mutex_unlock(&inode->i_mutex);
346 rpc_pipe_poll(struct file *filp, struct poll_table_struct *wait)
348 struct inode *inode = file_inode(filp);
349 struct rpc_inode *rpci = RPC_I(inode);
350 unsigned int mask = POLLOUT | POLLWRNORM;
352 poll_wait(filp, &rpci->waitq, wait);
354 mutex_lock(&inode->i_mutex);
355 if (rpci->pipe == NULL)
356 mask |= POLLERR | POLLHUP;
357 else if (filp->private_data || !list_empty(&rpci->pipe->pipe))
358 mask |= POLLIN | POLLRDNORM;
359 mutex_unlock(&inode->i_mutex);
364 rpc_pipe_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
366 struct inode *inode = file_inode(filp);
367 struct rpc_pipe *pipe;
372 mutex_lock(&inode->i_mutex);
373 pipe = RPC_I(inode)->pipe;
375 mutex_unlock(&inode->i_mutex);
378 spin_lock(&pipe->lock);
380 if (filp->private_data) {
381 struct rpc_pipe_msg *msg;
382 msg = filp->private_data;
383 len += msg->len - msg->copied;
385 spin_unlock(&pipe->lock);
386 mutex_unlock(&inode->i_mutex);
387 return put_user(len, (int __user *)arg);
393 static const struct file_operations rpc_pipe_fops = {
394 .owner = THIS_MODULE,
396 .read = rpc_pipe_read,
397 .write = rpc_pipe_write,
398 .poll = rpc_pipe_poll,
399 .unlocked_ioctl = rpc_pipe_ioctl,
400 .open = rpc_pipe_open,
401 .release = rpc_pipe_release,
405 rpc_show_info(struct seq_file *m, void *v)
407 struct rpc_clnt *clnt = m->private;
410 seq_printf(m, "RPC server: %s\n",
411 rcu_dereference(clnt->cl_xprt)->servername);
412 seq_printf(m, "service: %s (%d) version %d\n", clnt->cl_protname,
413 clnt->cl_prog, clnt->cl_vers);
414 seq_printf(m, "address: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_ADDR));
415 seq_printf(m, "protocol: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PROTO));
416 seq_printf(m, "port: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PORT));
422 rpc_info_open(struct inode *inode, struct file *file)
424 struct rpc_clnt *clnt = NULL;
425 int ret = single_open(file, rpc_show_info, NULL);
428 struct seq_file *m = file->private_data;
430 spin_lock(&file->f_path.dentry->d_lock);
431 if (!d_unhashed(file->f_path.dentry))
432 clnt = RPC_I(inode)->private;
433 if (clnt != NULL && atomic_inc_not_zero(&clnt->cl_count)) {
434 spin_unlock(&file->f_path.dentry->d_lock);
437 spin_unlock(&file->f_path.dentry->d_lock);
438 single_release(inode, file);
446 rpc_info_release(struct inode *inode, struct file *file)
448 struct seq_file *m = file->private_data;
449 struct rpc_clnt *clnt = (struct rpc_clnt *)m->private;
452 rpc_release_client(clnt);
453 return single_release(inode, file);
456 static const struct file_operations rpc_info_operations = {
457 .owner = THIS_MODULE,
458 .open = rpc_info_open,
461 .release = rpc_info_release,
466 * Description of fs contents.
468 struct rpc_filelist {
470 const struct file_operations *i_fop;
474 static int rpc_delete_dentry(const struct dentry *dentry)
479 static const struct dentry_operations rpc_dentry_operations = {
480 .d_delete = rpc_delete_dentry,
483 static struct inode *
484 rpc_get_inode(struct super_block *sb, umode_t mode)
486 struct inode *inode = new_inode(sb);
489 inode->i_ino = get_next_ino();
490 inode->i_mode = mode;
491 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
492 switch (mode & S_IFMT) {
494 inode->i_fop = &simple_dir_operations;
495 inode->i_op = &simple_dir_inode_operations;
503 static int __rpc_create_common(struct inode *dir, struct dentry *dentry,
505 const struct file_operations *i_fop,
511 inode = rpc_get_inode(dir->i_sb, mode);
514 inode->i_ino = iunique(dir->i_sb, 100);
516 inode->i_fop = i_fop;
518 rpc_inode_setowner(inode, private);
519 d_add(dentry, inode);
522 printk(KERN_WARNING "%s: %s failed to allocate inode for dentry %s\n",
523 __FILE__, __func__, dentry->d_name.name);
528 static int __rpc_create(struct inode *dir, struct dentry *dentry,
530 const struct file_operations *i_fop,
535 err = __rpc_create_common(dir, dentry, S_IFREG | mode, i_fop, private);
538 fsnotify_create(dir, dentry);
542 static int __rpc_mkdir(struct inode *dir, struct dentry *dentry,
544 const struct file_operations *i_fop,
549 err = __rpc_create_common(dir, dentry, S_IFDIR | mode, i_fop, private);
553 fsnotify_mkdir(dir, dentry);
558 init_pipe(struct rpc_pipe *pipe)
562 INIT_LIST_HEAD(&pipe->in_upcall);
563 INIT_LIST_HEAD(&pipe->in_downcall);
564 INIT_LIST_HEAD(&pipe->pipe);
566 INIT_DELAYED_WORK(&pipe->queue_timeout,
567 rpc_timeout_upcall_queue);
569 spin_lock_init(&pipe->lock);
573 void rpc_destroy_pipe_data(struct rpc_pipe *pipe)
577 EXPORT_SYMBOL_GPL(rpc_destroy_pipe_data);
579 struct rpc_pipe *rpc_mkpipe_data(const struct rpc_pipe_ops *ops, int flags)
581 struct rpc_pipe *pipe;
583 pipe = kzalloc(sizeof(struct rpc_pipe), GFP_KERNEL);
585 return ERR_PTR(-ENOMEM);
591 EXPORT_SYMBOL_GPL(rpc_mkpipe_data);
593 static int __rpc_mkpipe_dentry(struct inode *dir, struct dentry *dentry,
595 const struct file_operations *i_fop,
597 struct rpc_pipe *pipe)
599 struct rpc_inode *rpci;
602 err = __rpc_create_common(dir, dentry, S_IFIFO | mode, i_fop, private);
605 rpci = RPC_I(dentry->d_inode);
606 rpci->private = private;
608 fsnotify_create(dir, dentry);
612 static int __rpc_rmdir(struct inode *dir, struct dentry *dentry)
617 ret = simple_rmdir(dir, dentry);
623 int rpc_rmdir(struct dentry *dentry)
625 struct dentry *parent;
629 parent = dget_parent(dentry);
630 dir = parent->d_inode;
631 mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
632 error = __rpc_rmdir(dir, dentry);
633 mutex_unlock(&dir->i_mutex);
637 EXPORT_SYMBOL_GPL(rpc_rmdir);
639 static int __rpc_unlink(struct inode *dir, struct dentry *dentry)
644 ret = simple_unlink(dir, dentry);
650 static int __rpc_rmpipe(struct inode *dir, struct dentry *dentry)
652 struct inode *inode = dentry->d_inode;
654 rpc_close_pipes(inode);
655 return __rpc_unlink(dir, dentry);
658 static struct dentry *__rpc_lookup_create_exclusive(struct dentry *parent,
661 struct dentry *dentry;
663 dentry = d_lookup(parent, name);
665 dentry = d_alloc(parent, name);
667 return ERR_PTR(-ENOMEM);
669 if (dentry->d_inode == NULL) {
671 d_set_d_op(dentry, &rpc_dentry_operations);
675 return ERR_PTR(-EEXIST);
679 * FIXME: This probably has races.
681 static void __rpc_depopulate(struct dentry *parent,
682 const struct rpc_filelist *files,
685 struct inode *dir = parent->d_inode;
686 struct dentry *dentry;
690 for (i = start; i < eof; i++) {
691 name.name = files[i].name;
692 name.len = strlen(files[i].name);
693 name.hash = full_name_hash(name.name, name.len);
694 dentry = d_lookup(parent, &name);
698 if (dentry->d_inode == NULL)
700 switch (dentry->d_inode->i_mode & S_IFMT) {
704 __rpc_unlink(dir, dentry);
707 __rpc_rmdir(dir, dentry);
714 static void rpc_depopulate(struct dentry *parent,
715 const struct rpc_filelist *files,
718 struct inode *dir = parent->d_inode;
720 mutex_lock_nested(&dir->i_mutex, I_MUTEX_CHILD);
721 __rpc_depopulate(parent, files, start, eof);
722 mutex_unlock(&dir->i_mutex);
725 static int rpc_populate(struct dentry *parent,
726 const struct rpc_filelist *files,
730 struct inode *dir = parent->d_inode;
731 struct dentry *dentry;
734 mutex_lock(&dir->i_mutex);
735 for (i = start; i < eof; i++) {
738 q.name = files[i].name;
739 q.len = strlen(files[i].name);
740 q.hash = full_name_hash(q.name, q.len);
741 dentry = __rpc_lookup_create_exclusive(parent, &q);
742 err = PTR_ERR(dentry);
745 switch (files[i].mode & S_IFMT) {
749 err = __rpc_create(dir, dentry,
755 err = __rpc_mkdir(dir, dentry,
763 mutex_unlock(&dir->i_mutex);
766 __rpc_depopulate(parent, files, start, eof);
767 mutex_unlock(&dir->i_mutex);
768 printk(KERN_WARNING "%s: %s failed to populate directory %s\n",
769 __FILE__, __func__, parent->d_name.name);
773 static struct dentry *rpc_mkdir_populate(struct dentry *parent,
774 struct qstr *name, umode_t mode, void *private,
775 int (*populate)(struct dentry *, void *), void *args_populate)
777 struct dentry *dentry;
778 struct inode *dir = parent->d_inode;
781 mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
782 dentry = __rpc_lookup_create_exclusive(parent, name);
785 error = __rpc_mkdir(dir, dentry, mode, NULL, private);
788 if (populate != NULL) {
789 error = populate(dentry, args_populate);
794 mutex_unlock(&dir->i_mutex);
797 __rpc_rmdir(dir, dentry);
799 dentry = ERR_PTR(error);
803 static int rpc_rmdir_depopulate(struct dentry *dentry,
804 void (*depopulate)(struct dentry *))
806 struct dentry *parent;
810 parent = dget_parent(dentry);
811 dir = parent->d_inode;
812 mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
813 if (depopulate != NULL)
815 error = __rpc_rmdir(dir, dentry);
816 mutex_unlock(&dir->i_mutex);
822 * rpc_mkpipe - make an rpc_pipefs file for kernel<->userspace communication
823 * @parent: dentry of directory to create new "pipe" in
824 * @name: name of pipe
825 * @private: private data to associate with the pipe, for the caller's use
826 * @pipe: &rpc_pipe containing input parameters
828 * Data is made available for userspace to read by calls to
829 * rpc_queue_upcall(). The actual reads will result in calls to
830 * @ops->upcall, which will be called with the file pointer,
831 * message, and userspace buffer to copy to.
833 * Writes can come at any time, and do not necessarily have to be
834 * responses to upcalls. They will result in calls to @msg->downcall.
836 * The @private argument passed here will be available to all these methods
837 * from the file pointer, via RPC_I(file_inode(file))->private.
839 struct dentry *rpc_mkpipe_dentry(struct dentry *parent, const char *name,
840 void *private, struct rpc_pipe *pipe)
842 struct dentry *dentry;
843 struct inode *dir = parent->d_inode;
844 umode_t umode = S_IFIFO | S_IRUSR | S_IWUSR;
848 if (pipe->ops->upcall == NULL)
850 if (pipe->ops->downcall == NULL)
854 q.len = strlen(name);
855 q.hash = full_name_hash(q.name, q.len),
857 mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
858 dentry = __rpc_lookup_create_exclusive(parent, &q);
861 err = __rpc_mkpipe_dentry(dir, dentry, umode, &rpc_pipe_fops,
866 mutex_unlock(&dir->i_mutex);
869 dentry = ERR_PTR(err);
870 printk(KERN_WARNING "%s: %s() failed to create pipe %s/%s (errno = %d)\n",
871 __FILE__, __func__, parent->d_name.name, name,
875 EXPORT_SYMBOL_GPL(rpc_mkpipe_dentry);
878 * rpc_unlink - remove a pipe
879 * @dentry: dentry for the pipe, as returned from rpc_mkpipe
881 * After this call, lookups will no longer find the pipe, and any
882 * attempts to read or write using preexisting opens of the pipe will
886 rpc_unlink(struct dentry *dentry)
888 struct dentry *parent;
892 parent = dget_parent(dentry);
893 dir = parent->d_inode;
894 mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
895 error = __rpc_rmpipe(dir, dentry);
896 mutex_unlock(&dir->i_mutex);
900 EXPORT_SYMBOL_GPL(rpc_unlink);
907 static const struct rpc_filelist authfiles[] = {
910 .i_fop = &rpc_info_operations,
911 .mode = S_IFREG | S_IRUSR,
915 static int rpc_clntdir_populate(struct dentry *dentry, void *private)
917 return rpc_populate(dentry,
918 authfiles, RPCAUTH_info, RPCAUTH_EOF,
922 static void rpc_clntdir_depopulate(struct dentry *dentry)
924 rpc_depopulate(dentry, authfiles, RPCAUTH_info, RPCAUTH_EOF);
928 * rpc_create_client_dir - Create a new rpc_client directory in rpc_pipefs
929 * @dentry: dentry from the rpc_pipefs root to the new directory
930 * @name: &struct qstr for the name
931 * @rpc_client: rpc client to associate with this directory
933 * This creates a directory at the given @path associated with
934 * @rpc_clnt, which will contain a file named "info" with some basic
935 * information about the client, together with any "pipes" that may
936 * later be created using rpc_mkpipe().
938 struct dentry *rpc_create_client_dir(struct dentry *dentry,
940 struct rpc_clnt *rpc_client)
942 return rpc_mkdir_populate(dentry, name, S_IRUGO | S_IXUGO, NULL,
943 rpc_clntdir_populate, rpc_client);
947 * rpc_remove_client_dir - Remove a directory created with rpc_create_client_dir()
948 * @dentry: dentry for the pipe
950 int rpc_remove_client_dir(struct dentry *dentry)
952 return rpc_rmdir_depopulate(dentry, rpc_clntdir_depopulate);
955 static const struct rpc_filelist cache_pipefs_files[3] = {
958 .i_fop = &cache_file_operations_pipefs,
959 .mode = S_IFREG|S_IRUSR|S_IWUSR,
963 .i_fop = &content_file_operations_pipefs,
964 .mode = S_IFREG|S_IRUSR,
968 .i_fop = &cache_flush_operations_pipefs,
969 .mode = S_IFREG|S_IRUSR|S_IWUSR,
973 static int rpc_cachedir_populate(struct dentry *dentry, void *private)
975 return rpc_populate(dentry,
976 cache_pipefs_files, 0, 3,
980 static void rpc_cachedir_depopulate(struct dentry *dentry)
982 rpc_depopulate(dentry, cache_pipefs_files, 0, 3);
985 struct dentry *rpc_create_cache_dir(struct dentry *parent, struct qstr *name,
986 umode_t umode, struct cache_detail *cd)
988 return rpc_mkdir_populate(parent, name, umode, NULL,
989 rpc_cachedir_populate, cd);
992 void rpc_remove_cache_dir(struct dentry *dentry)
994 rpc_rmdir_depopulate(dentry, rpc_cachedir_depopulate);
998 * populate the filesystem
1000 static const struct super_operations s_ops = {
1001 .alloc_inode = rpc_alloc_inode,
1002 .destroy_inode = rpc_destroy_inode,
1003 .statfs = simple_statfs,
1006 #define RPCAUTH_GSSMAGIC 0x67596969
1009 * We have a single directory with 1 node in it.
1023 static const struct rpc_filelist files[] = {
1026 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
1030 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
1034 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
1036 [RPCAUTH_portmap] = {
1038 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
1042 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
1044 [RPCAUTH_nfsd4_cb] = {
1046 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
1050 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
1054 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
1059 * This call can be used only in RPC pipefs mount notification hooks.
1061 struct dentry *rpc_d_lookup_sb(const struct super_block *sb,
1062 const unsigned char *dir_name)
1064 struct qstr dir = QSTR_INIT(dir_name, strlen(dir_name));
1066 dir.hash = full_name_hash(dir.name, dir.len);
1067 return d_lookup(sb->s_root, &dir);
1069 EXPORT_SYMBOL_GPL(rpc_d_lookup_sb);
1071 void rpc_pipefs_init_net(struct net *net)
1073 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1075 mutex_init(&sn->pipefs_sb_lock);
1076 sn->gssd_running = 1;
1077 sn->pipe_version = -1;
1081 * This call will be used for per network namespace operations calls.
1082 * Note: Function will be returned with pipefs_sb_lock taken if superblock was
1083 * found. This lock have to be released by rpc_put_sb_net() when all operations
1084 * will be completed.
1086 struct super_block *rpc_get_sb_net(const struct net *net)
1088 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1090 mutex_lock(&sn->pipefs_sb_lock);
1092 return sn->pipefs_sb;
1093 mutex_unlock(&sn->pipefs_sb_lock);
1096 EXPORT_SYMBOL_GPL(rpc_get_sb_net);
1098 void rpc_put_sb_net(const struct net *net)
1100 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1102 WARN_ON(sn->pipefs_sb == NULL);
1103 mutex_unlock(&sn->pipefs_sb_lock);
1105 EXPORT_SYMBOL_GPL(rpc_put_sb_net);
1108 rpc_fill_super(struct super_block *sb, void *data, int silent)
1110 struct inode *inode;
1111 struct dentry *root;
1112 struct net *net = data;
1113 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1116 sb->s_blocksize = PAGE_CACHE_SIZE;
1117 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
1118 sb->s_magic = RPCAUTH_GSSMAGIC;
1120 sb->s_time_gran = 1;
1122 inode = rpc_get_inode(sb, S_IFDIR | S_IRUGO | S_IXUGO);
1123 sb->s_root = root = d_make_root(inode);
1126 if (rpc_populate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF, NULL))
1128 dprintk("RPC: sending pipefs MOUNT notification for net %p%s\n",
1129 net, NET_NAME(net));
1130 mutex_lock(&sn->pipefs_sb_lock);
1132 err = blocking_notifier_call_chain(&rpc_pipefs_notifier_list,
1136 goto err_depopulate;
1137 sb->s_fs_info = get_net(net);
1138 mutex_unlock(&sn->pipefs_sb_lock);
1142 blocking_notifier_call_chain(&rpc_pipefs_notifier_list,
1145 sn->pipefs_sb = NULL;
1146 __rpc_depopulate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF);
1147 mutex_unlock(&sn->pipefs_sb_lock);
1151 static struct dentry *
1152 rpc_mount(struct file_system_type *fs_type,
1153 int flags, const char *dev_name, void *data)
1155 return mount_ns(fs_type, flags, current->nsproxy->net_ns, rpc_fill_super);
1158 static void rpc_kill_sb(struct super_block *sb)
1160 struct net *net = sb->s_fs_info;
1161 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1163 mutex_lock(&sn->pipefs_sb_lock);
1164 if (sn->pipefs_sb != sb) {
1165 mutex_unlock(&sn->pipefs_sb_lock);
1168 sn->pipefs_sb = NULL;
1169 dprintk("RPC: sending pipefs UMOUNT notification for net %p%s\n",
1170 net, NET_NAME(net));
1171 blocking_notifier_call_chain(&rpc_pipefs_notifier_list,
1174 mutex_unlock(&sn->pipefs_sb_lock);
1177 kill_litter_super(sb);
1180 static struct file_system_type rpc_pipe_fs_type = {
1181 .owner = THIS_MODULE,
1182 .name = "rpc_pipefs",
1184 .kill_sb = rpc_kill_sb,
1186 MODULE_ALIAS_FS("rpc_pipefs");
1187 MODULE_ALIAS("rpc_pipefs");
1190 init_once(void *foo)
1192 struct rpc_inode *rpci = (struct rpc_inode *) foo;
1194 inode_init_once(&rpci->vfs_inode);
1195 rpci->private = NULL;
1197 init_waitqueue_head(&rpci->waitq);
1200 int register_rpc_pipefs(void)
1204 rpc_inode_cachep = kmem_cache_create("rpc_inode_cache",
1205 sizeof(struct rpc_inode),
1206 0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1209 if (!rpc_inode_cachep)
1211 err = rpc_clients_notifier_register();
1214 err = register_filesystem(&rpc_pipe_fs_type);
1220 rpc_clients_notifier_unregister();
1222 kmem_cache_destroy(rpc_inode_cachep);
1226 void unregister_rpc_pipefs(void)
1228 rpc_clients_notifier_unregister();
1229 kmem_cache_destroy(rpc_inode_cachep);
1230 unregister_filesystem(&rpc_pipe_fs_type);