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->private = private;
560 fsnotify_create(dir, dentry);
564 static int __rpc_rmdir(struct inode *dir, struct dentry *dentry)
569 ret = simple_rmdir(dir, dentry);
575 static int __rpc_unlink(struct inode *dir, struct dentry *dentry)
580 ret = simple_unlink(dir, dentry);
586 static int __rpc_rmpipe(struct inode *dir, struct dentry *dentry)
588 struct inode *inode = dentry->d_inode;
590 rpc_close_pipes(inode);
591 return __rpc_unlink(dir, dentry);
594 static struct dentry *__rpc_lookup_create_exclusive(struct dentry *parent,
597 struct dentry *dentry;
599 dentry = d_lookup(parent, name);
601 dentry = d_alloc(parent, name);
603 return ERR_PTR(-ENOMEM);
605 if (dentry->d_inode == NULL) {
606 d_set_d_op(dentry, &rpc_dentry_operations);
610 return ERR_PTR(-EEXIST);
614 * FIXME: This probably has races.
616 static void __rpc_depopulate(struct dentry *parent,
617 const struct rpc_filelist *files,
620 struct inode *dir = parent->d_inode;
621 struct dentry *dentry;
625 for (i = start; i < eof; i++) {
626 name.name = files[i].name;
627 name.len = strlen(files[i].name);
628 name.hash = full_name_hash(name.name, name.len);
629 dentry = d_lookup(parent, &name);
633 if (dentry->d_inode == NULL)
635 switch (dentry->d_inode->i_mode & S_IFMT) {
639 __rpc_unlink(dir, dentry);
642 __rpc_rmdir(dir, dentry);
649 static void rpc_depopulate(struct dentry *parent,
650 const struct rpc_filelist *files,
653 struct inode *dir = parent->d_inode;
655 mutex_lock_nested(&dir->i_mutex, I_MUTEX_CHILD);
656 __rpc_depopulate(parent, files, start, eof);
657 mutex_unlock(&dir->i_mutex);
660 static int rpc_populate(struct dentry *parent,
661 const struct rpc_filelist *files,
665 struct inode *dir = parent->d_inode;
666 struct dentry *dentry;
669 mutex_lock(&dir->i_mutex);
670 for (i = start; i < eof; i++) {
673 q.name = files[i].name;
674 q.len = strlen(files[i].name);
675 q.hash = full_name_hash(q.name, q.len);
676 dentry = __rpc_lookup_create_exclusive(parent, &q);
677 err = PTR_ERR(dentry);
680 switch (files[i].mode & S_IFMT) {
684 err = __rpc_create(dir, dentry,
690 err = __rpc_mkdir(dir, dentry,
698 mutex_unlock(&dir->i_mutex);
701 __rpc_depopulate(parent, files, start, eof);
702 mutex_unlock(&dir->i_mutex);
703 printk(KERN_WARNING "%s: %s failed to populate directory %s\n",
704 __FILE__, __func__, parent->d_name.name);
708 static struct dentry *rpc_mkdir_populate(struct dentry *parent,
709 struct qstr *name, umode_t mode, void *private,
710 int (*populate)(struct dentry *, void *), void *args_populate)
712 struct dentry *dentry;
713 struct inode *dir = parent->d_inode;
716 mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
717 dentry = __rpc_lookup_create_exclusive(parent, name);
720 error = __rpc_mkdir(dir, dentry, mode, NULL, private);
723 if (populate != NULL) {
724 error = populate(dentry, args_populate);
729 mutex_unlock(&dir->i_mutex);
732 __rpc_rmdir(dir, dentry);
734 dentry = ERR_PTR(error);
738 static int rpc_rmdir_depopulate(struct dentry *dentry,
739 void (*depopulate)(struct dentry *))
741 struct dentry *parent;
745 parent = dget_parent(dentry);
746 dir = parent->d_inode;
747 mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
748 if (depopulate != NULL)
750 error = __rpc_rmdir(dir, dentry);
751 mutex_unlock(&dir->i_mutex);
757 * rpc_mkpipe - make an rpc_pipefs file for kernel<->userspace communication
758 * @parent: dentry of directory to create new "pipe" in
759 * @name: name of pipe
760 * @private: private data to associate with the pipe, for the caller's use
761 * @ops: operations defining the behavior of the pipe: upcall, downcall,
762 * release_pipe, open_pipe, and destroy_msg.
763 * @flags: rpc_inode flags
765 * Data is made available for userspace to read by calls to
766 * rpc_queue_upcall(). The actual reads will result in calls to
767 * @ops->upcall, which will be called with the file pointer,
768 * message, and userspace buffer to copy to.
770 * Writes can come at any time, and do not necessarily have to be
771 * responses to upcalls. They will result in calls to @msg->downcall.
773 * The @private argument passed here will be available to all these methods
774 * from the file pointer, via RPC_I(file->f_dentry->d_inode)->private.
776 struct dentry *rpc_mkpipe(struct dentry *parent, const char *name,
777 void *private, const struct rpc_pipe_ops *ops,
780 struct dentry *dentry;
781 struct inode *dir = parent->d_inode;
782 umode_t umode = S_IFIFO | S_IRUSR | S_IWUSR;
786 if (ops->upcall == NULL)
788 if (ops->downcall == NULL)
792 q.len = strlen(name);
793 q.hash = full_name_hash(q.name, q.len),
795 mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
796 dentry = __rpc_lookup_create_exclusive(parent, &q);
799 err = __rpc_mkpipe(dir, dentry, umode, &rpc_pipe_fops,
800 private, ops, flags);
804 mutex_unlock(&dir->i_mutex);
807 dentry = ERR_PTR(err);
808 printk(KERN_WARNING "%s: %s() failed to create pipe %s/%s (errno = %d)\n",
809 __FILE__, __func__, parent->d_name.name, name,
813 EXPORT_SYMBOL_GPL(rpc_mkpipe);
816 * rpc_unlink - remove a pipe
817 * @dentry: dentry for the pipe, as returned from rpc_mkpipe
819 * After this call, lookups will no longer find the pipe, and any
820 * attempts to read or write using preexisting opens of the pipe will
824 rpc_unlink(struct dentry *dentry)
826 struct dentry *parent;
830 parent = dget_parent(dentry);
831 dir = parent->d_inode;
832 mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
833 error = __rpc_rmpipe(dir, dentry);
834 mutex_unlock(&dir->i_mutex);
838 EXPORT_SYMBOL_GPL(rpc_unlink);
845 static const struct rpc_filelist authfiles[] = {
848 .i_fop = &rpc_info_operations,
849 .mode = S_IFREG | S_IRUSR,
853 static int rpc_clntdir_populate(struct dentry *dentry, void *private)
855 return rpc_populate(dentry,
856 authfiles, RPCAUTH_info, RPCAUTH_EOF,
860 static void rpc_clntdir_depopulate(struct dentry *dentry)
862 rpc_depopulate(dentry, authfiles, RPCAUTH_info, RPCAUTH_EOF);
866 * rpc_create_client_dir - Create a new rpc_client directory in rpc_pipefs
867 * @dentry: dentry from the rpc_pipefs root to the new directory
868 * @name: &struct qstr for the name
869 * @rpc_client: rpc client to associate with this directory
871 * This creates a directory at the given @path associated with
872 * @rpc_clnt, which will contain a file named "info" with some basic
873 * information about the client, together with any "pipes" that may
874 * later be created using rpc_mkpipe().
876 struct dentry *rpc_create_client_dir(struct dentry *dentry,
878 struct rpc_clnt *rpc_client)
880 return rpc_mkdir_populate(dentry, name, S_IRUGO | S_IXUGO, NULL,
881 rpc_clntdir_populate, rpc_client);
885 * rpc_remove_client_dir - Remove a directory created with rpc_create_client_dir()
886 * @dentry: directory to remove
888 int rpc_remove_client_dir(struct dentry *dentry)
890 return rpc_rmdir_depopulate(dentry, rpc_clntdir_depopulate);
893 static const struct rpc_filelist cache_pipefs_files[3] = {
896 .i_fop = &cache_file_operations_pipefs,
897 .mode = S_IFREG|S_IRUSR|S_IWUSR,
901 .i_fop = &content_file_operations_pipefs,
902 .mode = S_IFREG|S_IRUSR,
906 .i_fop = &cache_flush_operations_pipefs,
907 .mode = S_IFREG|S_IRUSR|S_IWUSR,
911 static int rpc_cachedir_populate(struct dentry *dentry, void *private)
913 return rpc_populate(dentry,
914 cache_pipefs_files, 0, 3,
918 static void rpc_cachedir_depopulate(struct dentry *dentry)
920 rpc_depopulate(dentry, cache_pipefs_files, 0, 3);
923 struct dentry *rpc_create_cache_dir(struct dentry *parent, struct qstr *name,
924 umode_t umode, struct cache_detail *cd)
926 return rpc_mkdir_populate(parent, name, umode, NULL,
927 rpc_cachedir_populate, cd);
930 void rpc_remove_cache_dir(struct dentry *dentry)
932 rpc_rmdir_depopulate(dentry, rpc_cachedir_depopulate);
936 * populate the filesystem
938 static const struct super_operations s_ops = {
939 .alloc_inode = rpc_alloc_inode,
940 .destroy_inode = rpc_destroy_inode,
941 .statfs = simple_statfs,
944 #define RPCAUTH_GSSMAGIC 0x67596969
947 * We have a single directory with 1 node in it.
960 static const struct rpc_filelist files[] = {
963 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
967 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
971 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
973 [RPCAUTH_portmap] = {
975 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
979 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
981 [RPCAUTH_nfsd4_cb] = {
983 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
987 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
992 rpc_fill_super(struct super_block *sb, void *data, int silent)
996 struct net *net = data;
998 sb->s_blocksize = PAGE_CACHE_SIZE;
999 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
1000 sb->s_magic = RPCAUTH_GSSMAGIC;
1002 sb->s_time_gran = 1;
1004 inode = rpc_get_inode(sb, S_IFDIR | 0755);
1007 sb->s_root = root = d_alloc_root(inode);
1012 if (rpc_populate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF, NULL))
1017 static struct dentry *
1018 rpc_mount(struct file_system_type *fs_type,
1019 int flags, const char *dev_name, void *data)
1021 return mount_ns(fs_type, flags, current->nsproxy->net_ns, rpc_fill_super);
1024 static struct file_system_type rpc_pipe_fs_type = {
1025 .owner = THIS_MODULE,
1026 .name = "rpc_pipefs",
1028 .kill_sb = kill_litter_super,
1032 init_once(void *foo)
1034 struct rpc_inode *rpci = (struct rpc_inode *) foo;
1036 inode_init_once(&rpci->vfs_inode);
1037 rpci->private = NULL;
1040 INIT_LIST_HEAD(&rpci->in_upcall);
1041 INIT_LIST_HEAD(&rpci->in_downcall);
1042 INIT_LIST_HEAD(&rpci->pipe);
1044 init_waitqueue_head(&rpci->waitq);
1045 INIT_DELAYED_WORK(&rpci->queue_timeout,
1046 rpc_timeout_upcall_queue);
1050 int register_rpc_pipefs(void)
1054 rpc_inode_cachep = kmem_cache_create("rpc_inode_cache",
1055 sizeof(struct rpc_inode),
1056 0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1059 if (!rpc_inode_cachep)
1061 err = register_filesystem(&rpc_pipe_fs_type);
1063 kmem_cache_destroy(rpc_inode_cachep);
1070 void unregister_rpc_pipefs(void)
1072 kmem_cache_destroy(rpc_inode_cachep);
1073 unregister_filesystem(&rpc_pipe_fs_type);
1076 /* Make 'mount -t rpc_pipefs ...' autoload this module. */
1077 MODULE_ALIAS("rpc_pipefs");