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>
20 #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>
31 static struct vfsmount *rpc_mnt __read_mostly;
32 static int rpc_mount_count;
34 static struct file_system_type rpc_pipe_fs_type;
37 static struct kmem_cache *rpc_inode_cachep __read_mostly;
39 #define RPC_UPCALL_TIMEOUT (30*HZ)
41 static void rpc_purge_list(struct rpc_inode *rpci, struct list_head *head,
42 void (*destroy_msg)(struct rpc_pipe_msg *), int err)
44 struct rpc_pipe_msg *msg;
49 msg = list_entry(head->next, struct rpc_pipe_msg, list);
50 list_del_init(&msg->list);
53 } while (!list_empty(head));
54 wake_up(&rpci->waitq);
58 rpc_timeout_upcall_queue(struct work_struct *work)
61 struct rpc_inode *rpci =
62 container_of(work, struct rpc_inode, queue_timeout.work);
63 struct inode *inode = &rpci->vfs_inode;
64 void (*destroy_msg)(struct rpc_pipe_msg *);
66 spin_lock(&inode->i_lock);
67 if (rpci->ops == NULL) {
68 spin_unlock(&inode->i_lock);
71 destroy_msg = rpci->ops->destroy_msg;
72 if (rpci->nreaders == 0) {
73 list_splice_init(&rpci->pipe, &free_list);
76 spin_unlock(&inode->i_lock);
77 rpc_purge_list(rpci, &free_list, destroy_msg, -ETIMEDOUT);
80 ssize_t rpc_pipe_generic_upcall(struct file *filp, struct rpc_pipe_msg *msg,
81 char __user *dst, size_t buflen)
83 char *data = (char *)msg->data + msg->copied;
84 size_t mlen = min(msg->len - msg->copied, buflen);
87 left = copy_to_user(dst, data, mlen);
98 EXPORT_SYMBOL_GPL(rpc_pipe_generic_upcall);
101 * rpc_queue_upcall - queue an upcall message to userspace
102 * @inode: inode of upcall pipe on which to queue given message
103 * @msg: message to queue
105 * Call with an @inode created by rpc_mkpipe() to queue an upcall.
106 * A userspace process may then later read the upcall by performing a
107 * read on an open file for this inode. It is up to the caller to
108 * initialize the fields of @msg (other than @msg->list) appropriately.
111 rpc_queue_upcall(struct inode *inode, struct rpc_pipe_msg *msg)
113 struct rpc_inode *rpci = RPC_I(inode);
116 spin_lock(&inode->i_lock);
117 if (rpci->ops == NULL)
119 if (rpci->nreaders) {
120 list_add_tail(&msg->list, &rpci->pipe);
121 rpci->pipelen += msg->len;
123 } else if (rpci->flags & RPC_PIPE_WAIT_FOR_OPEN) {
124 if (list_empty(&rpci->pipe))
125 queue_delayed_work(rpciod_workqueue,
126 &rpci->queue_timeout,
128 list_add_tail(&msg->list, &rpci->pipe);
129 rpci->pipelen += msg->len;
133 spin_unlock(&inode->i_lock);
134 wake_up(&rpci->waitq);
137 EXPORT_SYMBOL_GPL(rpc_queue_upcall);
140 rpc_inode_setowner(struct inode *inode, void *private)
142 RPC_I(inode)->private = private;
146 rpc_close_pipes(struct inode *inode)
148 struct rpc_inode *rpci = RPC_I(inode);
149 const struct rpc_pipe_ops *ops;
152 mutex_lock(&inode->i_mutex);
155 LIST_HEAD(free_list);
156 spin_lock(&inode->i_lock);
157 need_release = rpci->nreaders != 0 || rpci->nwriters != 0;
159 list_splice_init(&rpci->in_upcall, &free_list);
160 list_splice_init(&rpci->pipe, &free_list);
163 spin_unlock(&inode->i_lock);
164 rpc_purge_list(rpci, &free_list, ops->destroy_msg, -EPIPE);
166 if (need_release && ops->release_pipe)
167 ops->release_pipe(inode);
168 cancel_delayed_work_sync(&rpci->queue_timeout);
170 rpc_inode_setowner(inode, NULL);
171 mutex_unlock(&inode->i_mutex);
174 static struct inode *
175 rpc_alloc_inode(struct super_block *sb)
177 struct rpc_inode *rpci;
178 rpci = (struct rpc_inode *)kmem_cache_alloc(rpc_inode_cachep, GFP_KERNEL);
181 return &rpci->vfs_inode;
185 rpc_i_callback(struct rcu_head *head)
187 struct inode *inode = container_of(head, struct inode, i_rcu);
188 kmem_cache_free(rpc_inode_cachep, RPC_I(inode));
192 rpc_destroy_inode(struct inode *inode)
194 call_rcu(&inode->i_rcu, rpc_i_callback);
198 rpc_pipe_open(struct inode *inode, struct file *filp)
200 struct rpc_inode *rpci = RPC_I(inode);
204 mutex_lock(&inode->i_mutex);
205 if (rpci->ops == NULL)
207 first_open = rpci->nreaders == 0 && rpci->nwriters == 0;
208 if (first_open && rpci->ops->open_pipe) {
209 res = rpci->ops->open_pipe(inode);
213 if (filp->f_mode & FMODE_READ)
215 if (filp->f_mode & FMODE_WRITE)
219 mutex_unlock(&inode->i_mutex);
224 rpc_pipe_release(struct inode *inode, struct file *filp)
226 struct rpc_inode *rpci = RPC_I(inode);
227 struct rpc_pipe_msg *msg;
230 mutex_lock(&inode->i_mutex);
231 if (rpci->ops == NULL)
233 msg = filp->private_data;
235 spin_lock(&inode->i_lock);
236 msg->errno = -EAGAIN;
237 list_del_init(&msg->list);
238 spin_unlock(&inode->i_lock);
239 rpci->ops->destroy_msg(msg);
241 if (filp->f_mode & FMODE_WRITE)
243 if (filp->f_mode & FMODE_READ) {
245 if (rpci->nreaders == 0) {
246 LIST_HEAD(free_list);
247 spin_lock(&inode->i_lock);
248 list_splice_init(&rpci->pipe, &free_list);
250 spin_unlock(&inode->i_lock);
251 rpc_purge_list(rpci, &free_list,
252 rpci->ops->destroy_msg, -EAGAIN);
255 last_close = rpci->nwriters == 0 && rpci->nreaders == 0;
256 if (last_close && rpci->ops->release_pipe)
257 rpci->ops->release_pipe(inode);
259 mutex_unlock(&inode->i_mutex);
264 rpc_pipe_read(struct file *filp, char __user *buf, size_t len, loff_t *offset)
266 struct inode *inode = filp->f_path.dentry->d_inode;
267 struct rpc_inode *rpci = RPC_I(inode);
268 struct rpc_pipe_msg *msg;
271 mutex_lock(&inode->i_mutex);
272 if (rpci->ops == NULL) {
276 msg = filp->private_data;
278 spin_lock(&inode->i_lock);
279 if (!list_empty(&rpci->pipe)) {
280 msg = list_entry(rpci->pipe.next,
283 list_move(&msg->list, &rpci->in_upcall);
284 rpci->pipelen -= msg->len;
285 filp->private_data = msg;
288 spin_unlock(&inode->i_lock);
292 /* NOTE: it is up to the callback to update msg->copied */
293 res = rpci->ops->upcall(filp, msg, buf, len);
294 if (res < 0 || msg->len == msg->copied) {
295 filp->private_data = NULL;
296 spin_lock(&inode->i_lock);
297 list_del_init(&msg->list);
298 spin_unlock(&inode->i_lock);
299 rpci->ops->destroy_msg(msg);
302 mutex_unlock(&inode->i_mutex);
307 rpc_pipe_write(struct file *filp, const char __user *buf, size_t len, loff_t *offset)
309 struct inode *inode = filp->f_path.dentry->d_inode;
310 struct rpc_inode *rpci = RPC_I(inode);
313 mutex_lock(&inode->i_mutex);
315 if (rpci->ops != NULL)
316 res = rpci->ops->downcall(filp, buf, len);
317 mutex_unlock(&inode->i_mutex);
322 rpc_pipe_poll(struct file *filp, struct poll_table_struct *wait)
324 struct rpc_inode *rpci;
325 unsigned int mask = 0;
327 rpci = RPC_I(filp->f_path.dentry->d_inode);
328 poll_wait(filp, &rpci->waitq, wait);
330 mask = POLLOUT | POLLWRNORM;
331 if (rpci->ops == NULL)
332 mask |= POLLERR | POLLHUP;
333 if (filp->private_data || !list_empty(&rpci->pipe))
334 mask |= POLLIN | POLLRDNORM;
339 rpc_pipe_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
341 struct inode *inode = filp->f_path.dentry->d_inode;
342 struct rpc_inode *rpci = RPC_I(inode);
347 spin_lock(&inode->i_lock);
348 if (rpci->ops == NULL) {
349 spin_unlock(&inode->i_lock);
353 if (filp->private_data) {
354 struct rpc_pipe_msg *msg;
355 msg = filp->private_data;
356 len += msg->len - msg->copied;
358 spin_unlock(&inode->i_lock);
359 return put_user(len, (int __user *)arg);
365 static const struct file_operations rpc_pipe_fops = {
366 .owner = THIS_MODULE,
368 .read = rpc_pipe_read,
369 .write = rpc_pipe_write,
370 .poll = rpc_pipe_poll,
371 .unlocked_ioctl = rpc_pipe_ioctl,
372 .open = rpc_pipe_open,
373 .release = rpc_pipe_release,
377 rpc_show_info(struct seq_file *m, void *v)
379 struct rpc_clnt *clnt = m->private;
381 seq_printf(m, "RPC server: %s\n", clnt->cl_server);
382 seq_printf(m, "service: %s (%d) version %d\n", clnt->cl_protname,
383 clnt->cl_prog, clnt->cl_vers);
384 seq_printf(m, "address: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_ADDR));
385 seq_printf(m, "protocol: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PROTO));
386 seq_printf(m, "port: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PORT));
391 rpc_info_open(struct inode *inode, struct file *file)
393 struct rpc_clnt *clnt = NULL;
394 int ret = single_open(file, rpc_show_info, NULL);
397 struct seq_file *m = file->private_data;
399 spin_lock(&file->f_path.dentry->d_lock);
400 if (!d_unhashed(file->f_path.dentry))
401 clnt = RPC_I(inode)->private;
402 if (clnt != NULL && atomic_inc_not_zero(&clnt->cl_count)) {
403 spin_unlock(&file->f_path.dentry->d_lock);
406 spin_unlock(&file->f_path.dentry->d_lock);
407 single_release(inode, file);
415 rpc_info_release(struct inode *inode, struct file *file)
417 struct seq_file *m = file->private_data;
418 struct rpc_clnt *clnt = (struct rpc_clnt *)m->private;
421 rpc_release_client(clnt);
422 return single_release(inode, file);
425 static const struct file_operations rpc_info_operations = {
426 .owner = THIS_MODULE,
427 .open = rpc_info_open,
430 .release = rpc_info_release,
435 * Description of fs contents.
437 struct rpc_filelist {
439 const struct file_operations *i_fop;
443 struct vfsmount *rpc_get_mount(void)
447 err = simple_pin_fs(&rpc_pipe_fs_type, &rpc_mnt, &rpc_mount_count);
452 EXPORT_SYMBOL_GPL(rpc_get_mount);
454 void rpc_put_mount(void)
456 simple_release_fs(&rpc_mnt, &rpc_mount_count);
458 EXPORT_SYMBOL_GPL(rpc_put_mount);
460 static int rpc_delete_dentry(const struct dentry *dentry)
465 static const struct dentry_operations rpc_dentry_operations = {
466 .d_delete = rpc_delete_dentry,
469 static struct inode *
470 rpc_get_inode(struct super_block *sb, umode_t mode)
472 struct inode *inode = new_inode(sb);
475 inode->i_ino = get_next_ino();
476 inode->i_mode = mode;
477 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
478 switch (mode & S_IFMT) {
480 inode->i_fop = &simple_dir_operations;
481 inode->i_op = &simple_dir_inode_operations;
489 static int __rpc_create_common(struct inode *dir, struct dentry *dentry,
491 const struct file_operations *i_fop,
497 inode = rpc_get_inode(dir->i_sb, mode);
500 inode->i_ino = iunique(dir->i_sb, 100);
502 inode->i_fop = i_fop;
504 rpc_inode_setowner(inode, private);
505 d_add(dentry, inode);
508 printk(KERN_WARNING "%s: %s failed to allocate inode for dentry %s\n",
509 __FILE__, __func__, dentry->d_name.name);
514 static int __rpc_create(struct inode *dir, struct dentry *dentry,
516 const struct file_operations *i_fop,
521 err = __rpc_create_common(dir, dentry, S_IFREG | mode, i_fop, private);
524 fsnotify_create(dir, dentry);
528 static int __rpc_mkdir(struct inode *dir, struct dentry *dentry,
530 const struct file_operations *i_fop,
535 err = __rpc_create_common(dir, dentry, S_IFDIR | mode, i_fop, private);
539 fsnotify_mkdir(dir, dentry);
543 static int __rpc_mkpipe(struct inode *dir, struct dentry *dentry,
545 const struct file_operations *i_fop,
547 const struct rpc_pipe_ops *ops,
550 struct rpc_inode *rpci;
553 err = __rpc_create_common(dir, dentry, S_IFIFO | mode, i_fop, private);
556 rpci = RPC_I(dentry->d_inode);
557 rpci->nkern_readwriters = 1;
558 rpci->private = private;
561 fsnotify_create(dir, dentry);
565 static int __rpc_rmdir(struct inode *dir, struct dentry *dentry)
570 ret = simple_rmdir(dir, dentry);
576 static int __rpc_unlink(struct inode *dir, struct dentry *dentry)
581 ret = simple_unlink(dir, dentry);
587 static int __rpc_rmpipe(struct inode *dir, struct dentry *dentry)
589 struct inode *inode = dentry->d_inode;
590 struct rpc_inode *rpci = RPC_I(inode);
592 rpci->nkern_readwriters--;
593 if (rpci->nkern_readwriters != 0)
595 rpc_close_pipes(inode);
596 return __rpc_unlink(dir, dentry);
599 static struct dentry *__rpc_lookup_create(struct dentry *parent,
602 struct dentry *dentry;
604 dentry = d_lookup(parent, name);
606 dentry = d_alloc(parent, name);
608 dentry = ERR_PTR(-ENOMEM);
612 if (!dentry->d_inode)
613 d_set_d_op(dentry, &rpc_dentry_operations);
618 static struct dentry *__rpc_lookup_create_exclusive(struct dentry *parent,
621 struct dentry *dentry;
623 dentry = __rpc_lookup_create(parent, name);
626 if (dentry->d_inode == NULL)
629 return ERR_PTR(-EEXIST);
633 * FIXME: This probably has races.
635 static void __rpc_depopulate(struct dentry *parent,
636 const struct rpc_filelist *files,
639 struct inode *dir = parent->d_inode;
640 struct dentry *dentry;
644 for (i = start; i < eof; i++) {
645 name.name = files[i].name;
646 name.len = strlen(files[i].name);
647 name.hash = full_name_hash(name.name, name.len);
648 dentry = d_lookup(parent, &name);
652 if (dentry->d_inode == NULL)
654 switch (dentry->d_inode->i_mode & S_IFMT) {
658 __rpc_unlink(dir, dentry);
661 __rpc_rmdir(dir, dentry);
668 static void rpc_depopulate(struct dentry *parent,
669 const struct rpc_filelist *files,
672 struct inode *dir = parent->d_inode;
674 mutex_lock_nested(&dir->i_mutex, I_MUTEX_CHILD);
675 __rpc_depopulate(parent, files, start, eof);
676 mutex_unlock(&dir->i_mutex);
679 static int rpc_populate(struct dentry *parent,
680 const struct rpc_filelist *files,
684 struct inode *dir = parent->d_inode;
685 struct dentry *dentry;
688 mutex_lock(&dir->i_mutex);
689 for (i = start; i < eof; i++) {
692 q.name = files[i].name;
693 q.len = strlen(files[i].name);
694 q.hash = full_name_hash(q.name, q.len);
695 dentry = __rpc_lookup_create_exclusive(parent, &q);
696 err = PTR_ERR(dentry);
699 switch (files[i].mode & S_IFMT) {
703 err = __rpc_create(dir, dentry,
709 err = __rpc_mkdir(dir, dentry,
717 mutex_unlock(&dir->i_mutex);
720 __rpc_depopulate(parent, files, start, eof);
721 mutex_unlock(&dir->i_mutex);
722 printk(KERN_WARNING "%s: %s failed to populate directory %s\n",
723 __FILE__, __func__, parent->d_name.name);
727 static struct dentry *rpc_mkdir_populate(struct dentry *parent,
728 struct qstr *name, umode_t mode, void *private,
729 int (*populate)(struct dentry *, void *), void *args_populate)
731 struct dentry *dentry;
732 struct inode *dir = parent->d_inode;
735 mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
736 dentry = __rpc_lookup_create_exclusive(parent, name);
739 error = __rpc_mkdir(dir, dentry, mode, NULL, private);
742 if (populate != NULL) {
743 error = populate(dentry, args_populate);
748 mutex_unlock(&dir->i_mutex);
751 __rpc_rmdir(dir, dentry);
753 dentry = ERR_PTR(error);
757 static int rpc_rmdir_depopulate(struct dentry *dentry,
758 void (*depopulate)(struct dentry *))
760 struct dentry *parent;
764 parent = dget_parent(dentry);
765 dir = parent->d_inode;
766 mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
767 if (depopulate != NULL)
769 error = __rpc_rmdir(dir, dentry);
770 mutex_unlock(&dir->i_mutex);
776 * rpc_mkpipe - make an rpc_pipefs file for kernel<->userspace communication
777 * @parent: dentry of directory to create new "pipe" in
778 * @name: name of pipe
779 * @private: private data to associate with the pipe, for the caller's use
780 * @ops: operations defining the behavior of the pipe: upcall, downcall,
781 * release_pipe, open_pipe, and destroy_msg.
782 * @flags: rpc_inode flags
784 * Data is made available for userspace to read by calls to
785 * rpc_queue_upcall(). The actual reads will result in calls to
786 * @ops->upcall, which will be called with the file pointer,
787 * message, and userspace buffer to copy to.
789 * Writes can come at any time, and do not necessarily have to be
790 * responses to upcalls. They will result in calls to @msg->downcall.
792 * The @private argument passed here will be available to all these methods
793 * from the file pointer, via RPC_I(file->f_dentry->d_inode)->private.
795 struct dentry *rpc_mkpipe(struct dentry *parent, const char *name,
796 void *private, const struct rpc_pipe_ops *ops,
799 struct dentry *dentry;
800 struct inode *dir = parent->d_inode;
801 umode_t umode = S_IFIFO | S_IRUSR | S_IWUSR;
805 if (ops->upcall == NULL)
807 if (ops->downcall == NULL)
811 q.len = strlen(name);
812 q.hash = full_name_hash(q.name, q.len),
814 mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
815 dentry = __rpc_lookup_create(parent, &q);
818 if (dentry->d_inode) {
819 struct rpc_inode *rpci = RPC_I(dentry->d_inode);
820 if (rpci->private != private ||
822 rpci->flags != flags) {
827 rpci->nkern_readwriters++;
831 err = __rpc_mkpipe(dir, dentry, umode, &rpc_pipe_fops,
832 private, ops, flags);
836 mutex_unlock(&dir->i_mutex);
839 dentry = ERR_PTR(err);
840 printk(KERN_WARNING "%s: %s() failed to create pipe %s/%s (errno = %d)\n",
841 __FILE__, __func__, parent->d_name.name, name,
845 EXPORT_SYMBOL_GPL(rpc_mkpipe);
848 * rpc_unlink - remove a pipe
849 * @dentry: dentry for the pipe, as returned from rpc_mkpipe
851 * After this call, lookups will no longer find the pipe, and any
852 * attempts to read or write using preexisting opens of the pipe will
856 rpc_unlink(struct dentry *dentry)
858 struct dentry *parent;
862 parent = dget_parent(dentry);
863 dir = parent->d_inode;
864 mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
865 error = __rpc_rmpipe(dir, dentry);
866 mutex_unlock(&dir->i_mutex);
870 EXPORT_SYMBOL_GPL(rpc_unlink);
877 static const struct rpc_filelist authfiles[] = {
880 .i_fop = &rpc_info_operations,
881 .mode = S_IFREG | S_IRUSR,
885 static int rpc_clntdir_populate(struct dentry *dentry, void *private)
887 return rpc_populate(dentry,
888 authfiles, RPCAUTH_info, RPCAUTH_EOF,
892 static void rpc_clntdir_depopulate(struct dentry *dentry)
894 rpc_depopulate(dentry, authfiles, RPCAUTH_info, RPCAUTH_EOF);
898 * rpc_create_client_dir - Create a new rpc_client directory in rpc_pipefs
899 * @dentry: dentry from the rpc_pipefs root to the new directory
900 * @name: &struct qstr for the name
901 * @rpc_client: rpc client to associate with this directory
903 * This creates a directory at the given @path associated with
904 * @rpc_clnt, which will contain a file named "info" with some basic
905 * information about the client, together with any "pipes" that may
906 * later be created using rpc_mkpipe().
908 struct dentry *rpc_create_client_dir(struct dentry *dentry,
910 struct rpc_clnt *rpc_client)
912 return rpc_mkdir_populate(dentry, name, S_IRUGO | S_IXUGO, NULL,
913 rpc_clntdir_populate, rpc_client);
917 * rpc_remove_client_dir - Remove a directory created with rpc_create_client_dir()
918 * @dentry: directory to remove
920 int rpc_remove_client_dir(struct dentry *dentry)
922 return rpc_rmdir_depopulate(dentry, rpc_clntdir_depopulate);
925 static const struct rpc_filelist cache_pipefs_files[3] = {
928 .i_fop = &cache_file_operations_pipefs,
929 .mode = S_IFREG|S_IRUSR|S_IWUSR,
933 .i_fop = &content_file_operations_pipefs,
934 .mode = S_IFREG|S_IRUSR,
938 .i_fop = &cache_flush_operations_pipefs,
939 .mode = S_IFREG|S_IRUSR|S_IWUSR,
943 static int rpc_cachedir_populate(struct dentry *dentry, void *private)
945 return rpc_populate(dentry,
946 cache_pipefs_files, 0, 3,
950 static void rpc_cachedir_depopulate(struct dentry *dentry)
952 rpc_depopulate(dentry, cache_pipefs_files, 0, 3);
955 struct dentry *rpc_create_cache_dir(struct dentry *parent, struct qstr *name,
956 umode_t umode, struct cache_detail *cd)
958 return rpc_mkdir_populate(parent, name, umode, NULL,
959 rpc_cachedir_populate, cd);
962 void rpc_remove_cache_dir(struct dentry *dentry)
964 rpc_rmdir_depopulate(dentry, rpc_cachedir_depopulate);
968 * populate the filesystem
970 static const struct super_operations s_ops = {
971 .alloc_inode = rpc_alloc_inode,
972 .destroy_inode = rpc_destroy_inode,
973 .statfs = simple_statfs,
976 #define RPCAUTH_GSSMAGIC 0x67596969
979 * We have a single directory with 1 node in it.
992 static const struct rpc_filelist files[] = {
995 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
999 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
1003 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
1005 [RPCAUTH_portmap] = {
1007 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
1011 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
1013 [RPCAUTH_nfsd4_cb] = {
1015 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
1019 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
1024 rpc_fill_super(struct super_block *sb, void *data, int silent)
1026 struct inode *inode;
1027 struct dentry *root;
1029 sb->s_blocksize = PAGE_CACHE_SIZE;
1030 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
1031 sb->s_magic = RPCAUTH_GSSMAGIC;
1033 sb->s_time_gran = 1;
1035 inode = rpc_get_inode(sb, S_IFDIR | 0755);
1038 sb->s_root = root = d_alloc_root(inode);
1043 if (rpc_populate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF, NULL))
1048 static struct dentry *
1049 rpc_mount(struct file_system_type *fs_type,
1050 int flags, const char *dev_name, void *data)
1052 return mount_single(fs_type, flags, data, rpc_fill_super);
1055 static struct file_system_type rpc_pipe_fs_type = {
1056 .owner = THIS_MODULE,
1057 .name = "rpc_pipefs",
1059 .kill_sb = kill_litter_super,
1063 init_once(void *foo)
1065 struct rpc_inode *rpci = (struct rpc_inode *) foo;
1067 inode_init_once(&rpci->vfs_inode);
1068 rpci->private = NULL;
1071 INIT_LIST_HEAD(&rpci->in_upcall);
1072 INIT_LIST_HEAD(&rpci->in_downcall);
1073 INIT_LIST_HEAD(&rpci->pipe);
1075 init_waitqueue_head(&rpci->waitq);
1076 INIT_DELAYED_WORK(&rpci->queue_timeout,
1077 rpc_timeout_upcall_queue);
1081 int register_rpc_pipefs(void)
1085 rpc_inode_cachep = kmem_cache_create("rpc_inode_cache",
1086 sizeof(struct rpc_inode),
1087 0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1090 if (!rpc_inode_cachep)
1092 err = register_filesystem(&rpc_pipe_fs_type);
1094 kmem_cache_destroy(rpc_inode_cachep);
1101 void unregister_rpc_pipefs(void)
1103 kmem_cache_destroy(rpc_inode_cachep);
1104 unregister_filesystem(&rpc_pipe_fs_type);
1107 /* Make 'mount -t rpc_pipefs ...' autoload this module. */
1108 MODULE_ALIAS("rpc_pipefs");