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);
81 * rpc_queue_upcall - queue an upcall message to userspace
82 * @inode: inode of upcall pipe on which to queue given message
83 * @msg: message to queue
85 * Call with an @inode created by rpc_mkpipe() to queue an upcall.
86 * A userspace process may then later read the upcall by performing a
87 * read on an open file for this inode. It is up to the caller to
88 * initialize the fields of @msg (other than @msg->list) appropriately.
91 rpc_queue_upcall(struct inode *inode, struct rpc_pipe_msg *msg)
93 struct rpc_inode *rpci = RPC_I(inode);
96 spin_lock(&inode->i_lock);
97 if (rpci->ops == NULL)
100 list_add_tail(&msg->list, &rpci->pipe);
101 rpci->pipelen += msg->len;
103 } else if (rpci->flags & RPC_PIPE_WAIT_FOR_OPEN) {
104 if (list_empty(&rpci->pipe))
105 queue_delayed_work(rpciod_workqueue,
106 &rpci->queue_timeout,
108 list_add_tail(&msg->list, &rpci->pipe);
109 rpci->pipelen += msg->len;
113 spin_unlock(&inode->i_lock);
114 wake_up(&rpci->waitq);
117 EXPORT_SYMBOL_GPL(rpc_queue_upcall);
120 rpc_inode_setowner(struct inode *inode, void *private)
122 RPC_I(inode)->private = private;
126 rpc_close_pipes(struct inode *inode)
128 struct rpc_inode *rpci = RPC_I(inode);
129 const struct rpc_pipe_ops *ops;
132 mutex_lock(&inode->i_mutex);
135 LIST_HEAD(free_list);
136 spin_lock(&inode->i_lock);
137 need_release = rpci->nreaders != 0 || rpci->nwriters != 0;
139 list_splice_init(&rpci->in_upcall, &free_list);
140 list_splice_init(&rpci->pipe, &free_list);
143 spin_unlock(&inode->i_lock);
144 rpc_purge_list(rpci, &free_list, ops->destroy_msg, -EPIPE);
146 if (need_release && ops->release_pipe)
147 ops->release_pipe(inode);
148 cancel_delayed_work_sync(&rpci->queue_timeout);
150 rpc_inode_setowner(inode, NULL);
151 mutex_unlock(&inode->i_mutex);
154 static struct inode *
155 rpc_alloc_inode(struct super_block *sb)
157 struct rpc_inode *rpci;
158 rpci = (struct rpc_inode *)kmem_cache_alloc(rpc_inode_cachep, GFP_KERNEL);
161 return &rpci->vfs_inode;
165 rpc_destroy_inode(struct inode *inode)
167 kmem_cache_free(rpc_inode_cachep, RPC_I(inode));
171 rpc_pipe_open(struct inode *inode, struct file *filp)
173 struct rpc_inode *rpci = RPC_I(inode);
177 mutex_lock(&inode->i_mutex);
178 if (rpci->ops == NULL)
180 first_open = rpci->nreaders == 0 && rpci->nwriters == 0;
181 if (first_open && rpci->ops->open_pipe) {
182 res = rpci->ops->open_pipe(inode);
186 if (filp->f_mode & FMODE_READ)
188 if (filp->f_mode & FMODE_WRITE)
192 mutex_unlock(&inode->i_mutex);
197 rpc_pipe_release(struct inode *inode, struct file *filp)
199 struct rpc_inode *rpci = RPC_I(inode);
200 struct rpc_pipe_msg *msg;
203 mutex_lock(&inode->i_mutex);
204 if (rpci->ops == NULL)
206 msg = filp->private_data;
208 spin_lock(&inode->i_lock);
209 msg->errno = -EAGAIN;
210 list_del_init(&msg->list);
211 spin_unlock(&inode->i_lock);
212 rpci->ops->destroy_msg(msg);
214 if (filp->f_mode & FMODE_WRITE)
216 if (filp->f_mode & FMODE_READ) {
218 if (rpci->nreaders == 0) {
219 LIST_HEAD(free_list);
220 spin_lock(&inode->i_lock);
221 list_splice_init(&rpci->pipe, &free_list);
223 spin_unlock(&inode->i_lock);
224 rpc_purge_list(rpci, &free_list,
225 rpci->ops->destroy_msg, -EAGAIN);
228 last_close = rpci->nwriters == 0 && rpci->nreaders == 0;
229 if (last_close && rpci->ops->release_pipe)
230 rpci->ops->release_pipe(inode);
232 mutex_unlock(&inode->i_mutex);
237 rpc_pipe_read(struct file *filp, char __user *buf, size_t len, loff_t *offset)
239 struct inode *inode = filp->f_path.dentry->d_inode;
240 struct rpc_inode *rpci = RPC_I(inode);
241 struct rpc_pipe_msg *msg;
244 mutex_lock(&inode->i_mutex);
245 if (rpci->ops == NULL) {
249 msg = filp->private_data;
251 spin_lock(&inode->i_lock);
252 if (!list_empty(&rpci->pipe)) {
253 msg = list_entry(rpci->pipe.next,
256 list_move(&msg->list, &rpci->in_upcall);
257 rpci->pipelen -= msg->len;
258 filp->private_data = msg;
261 spin_unlock(&inode->i_lock);
265 /* NOTE: it is up to the callback to update msg->copied */
266 res = rpci->ops->upcall(filp, msg, buf, len);
267 if (res < 0 || msg->len == msg->copied) {
268 filp->private_data = NULL;
269 spin_lock(&inode->i_lock);
270 list_del_init(&msg->list);
271 spin_unlock(&inode->i_lock);
272 rpci->ops->destroy_msg(msg);
275 mutex_unlock(&inode->i_mutex);
280 rpc_pipe_write(struct file *filp, const char __user *buf, size_t len, loff_t *offset)
282 struct inode *inode = filp->f_path.dentry->d_inode;
283 struct rpc_inode *rpci = RPC_I(inode);
286 mutex_lock(&inode->i_mutex);
288 if (rpci->ops != NULL)
289 res = rpci->ops->downcall(filp, buf, len);
290 mutex_unlock(&inode->i_mutex);
295 rpc_pipe_poll(struct file *filp, struct poll_table_struct *wait)
297 struct rpc_inode *rpci;
298 unsigned int mask = 0;
300 rpci = RPC_I(filp->f_path.dentry->d_inode);
301 poll_wait(filp, &rpci->waitq, wait);
303 mask = POLLOUT | POLLWRNORM;
304 if (rpci->ops == NULL)
305 mask |= POLLERR | POLLHUP;
306 if (filp->private_data || !list_empty(&rpci->pipe))
307 mask |= POLLIN | POLLRDNORM;
312 rpc_pipe_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
314 struct inode *inode = filp->f_path.dentry->d_inode;
315 struct rpc_inode *rpci = RPC_I(inode);
320 spin_lock(&inode->i_lock);
321 if (rpci->ops == NULL) {
322 spin_unlock(&inode->i_lock);
326 if (filp->private_data) {
327 struct rpc_pipe_msg *msg;
328 msg = filp->private_data;
329 len += msg->len - msg->copied;
331 spin_unlock(&inode->i_lock);
332 return put_user(len, (int __user *)arg);
338 static const struct file_operations rpc_pipe_fops = {
339 .owner = THIS_MODULE,
341 .read = rpc_pipe_read,
342 .write = rpc_pipe_write,
343 .poll = rpc_pipe_poll,
344 .unlocked_ioctl = rpc_pipe_ioctl,
345 .open = rpc_pipe_open,
346 .release = rpc_pipe_release,
350 rpc_show_info(struct seq_file *m, void *v)
352 struct rpc_clnt *clnt = m->private;
354 seq_printf(m, "RPC server: %s\n", clnt->cl_server);
355 seq_printf(m, "service: %s (%d) version %d\n", clnt->cl_protname,
356 clnt->cl_prog, clnt->cl_vers);
357 seq_printf(m, "address: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_ADDR));
358 seq_printf(m, "protocol: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PROTO));
359 seq_printf(m, "port: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PORT));
364 rpc_info_open(struct inode *inode, struct file *file)
366 struct rpc_clnt *clnt = NULL;
367 int ret = single_open(file, rpc_show_info, NULL);
370 struct seq_file *m = file->private_data;
372 spin_lock(&file->f_path.dentry->d_lock);
373 if (!d_unhashed(file->f_path.dentry))
374 clnt = RPC_I(inode)->private;
375 if (clnt != NULL && atomic_inc_not_zero(&clnt->cl_count)) {
376 spin_unlock(&file->f_path.dentry->d_lock);
379 spin_unlock(&file->f_path.dentry->d_lock);
380 single_release(inode, file);
388 rpc_info_release(struct inode *inode, struct file *file)
390 struct seq_file *m = file->private_data;
391 struct rpc_clnt *clnt = (struct rpc_clnt *)m->private;
394 rpc_release_client(clnt);
395 return single_release(inode, file);
398 static const struct file_operations rpc_info_operations = {
399 .owner = THIS_MODULE,
400 .open = rpc_info_open,
403 .release = rpc_info_release,
408 * Description of fs contents.
410 struct rpc_filelist {
412 const struct file_operations *i_fop;
416 struct vfsmount *rpc_get_mount(void)
420 err = simple_pin_fs(&rpc_pipe_fs_type, &rpc_mnt, &rpc_mount_count);
425 EXPORT_SYMBOL_GPL(rpc_get_mount);
427 void rpc_put_mount(void)
429 simple_release_fs(&rpc_mnt, &rpc_mount_count);
431 EXPORT_SYMBOL_GPL(rpc_put_mount);
433 static int rpc_delete_dentry(struct dentry *dentry)
438 static const struct dentry_operations rpc_dentry_operations = {
439 .d_delete = rpc_delete_dentry,
442 static struct inode *
443 rpc_get_inode(struct super_block *sb, umode_t mode)
445 struct inode *inode = new_inode(sb);
448 inode->i_ino = get_next_ino();
449 inode->i_mode = mode;
450 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
451 switch(mode & S_IFMT) {
453 inode->i_fop = &simple_dir_operations;
454 inode->i_op = &simple_dir_inode_operations;
462 static int __rpc_create_common(struct inode *dir, struct dentry *dentry,
464 const struct file_operations *i_fop,
469 BUG_ON(!d_unhashed(dentry));
470 inode = rpc_get_inode(dir->i_sb, mode);
473 inode->i_ino = iunique(dir->i_sb, 100);
475 inode->i_fop = i_fop;
477 rpc_inode_setowner(inode, private);
478 d_add(dentry, inode);
481 printk(KERN_WARNING "%s: %s failed to allocate inode for dentry %s\n",
482 __FILE__, __func__, dentry->d_name.name);
487 static int __rpc_create(struct inode *dir, struct dentry *dentry,
489 const struct file_operations *i_fop,
494 err = __rpc_create_common(dir, dentry, S_IFREG | mode, i_fop, private);
497 fsnotify_create(dir, dentry);
501 static int __rpc_mkdir(struct inode *dir, struct dentry *dentry,
503 const struct file_operations *i_fop,
508 err = __rpc_create_common(dir, dentry, S_IFDIR | mode, i_fop, private);
512 fsnotify_mkdir(dir, dentry);
516 static int __rpc_mkpipe(struct inode *dir, struct dentry *dentry,
518 const struct file_operations *i_fop,
520 const struct rpc_pipe_ops *ops,
523 struct rpc_inode *rpci;
526 err = __rpc_create_common(dir, dentry, S_IFIFO | mode, i_fop, private);
529 rpci = RPC_I(dentry->d_inode);
530 rpci->nkern_readwriters = 1;
531 rpci->private = private;
534 fsnotify_create(dir, dentry);
538 static int __rpc_rmdir(struct inode *dir, struct dentry *dentry)
543 ret = simple_rmdir(dir, dentry);
549 static int __rpc_unlink(struct inode *dir, struct dentry *dentry)
554 ret = simple_unlink(dir, dentry);
560 static int __rpc_rmpipe(struct inode *dir, struct dentry *dentry)
562 struct inode *inode = dentry->d_inode;
563 struct rpc_inode *rpci = RPC_I(inode);
565 rpci->nkern_readwriters--;
566 if (rpci->nkern_readwriters != 0)
568 rpc_close_pipes(inode);
569 return __rpc_unlink(dir, dentry);
572 static struct dentry *__rpc_lookup_create(struct dentry *parent,
575 struct dentry *dentry;
577 dentry = d_lookup(parent, name);
579 dentry = d_alloc(parent, name);
581 dentry = ERR_PTR(-ENOMEM);
585 if (!dentry->d_inode)
586 dentry->d_op = &rpc_dentry_operations;
591 static struct dentry *__rpc_lookup_create_exclusive(struct dentry *parent,
594 struct dentry *dentry;
596 dentry = __rpc_lookup_create(parent, name);
599 if (dentry->d_inode == NULL)
602 return ERR_PTR(-EEXIST);
606 * FIXME: This probably has races.
608 static void __rpc_depopulate(struct dentry *parent,
609 const struct rpc_filelist *files,
612 struct inode *dir = parent->d_inode;
613 struct dentry *dentry;
617 for (i = start; i < eof; i++) {
618 name.name = files[i].name;
619 name.len = strlen(files[i].name);
620 name.hash = full_name_hash(name.name, name.len);
621 dentry = d_lookup(parent, &name);
625 if (dentry->d_inode == NULL)
627 switch (dentry->d_inode->i_mode & S_IFMT) {
631 __rpc_unlink(dir, dentry);
634 __rpc_rmdir(dir, dentry);
641 static void rpc_depopulate(struct dentry *parent,
642 const struct rpc_filelist *files,
645 struct inode *dir = parent->d_inode;
647 mutex_lock_nested(&dir->i_mutex, I_MUTEX_CHILD);
648 __rpc_depopulate(parent, files, start, eof);
649 mutex_unlock(&dir->i_mutex);
652 static int rpc_populate(struct dentry *parent,
653 const struct rpc_filelist *files,
657 struct inode *dir = parent->d_inode;
658 struct dentry *dentry;
661 mutex_lock(&dir->i_mutex);
662 for (i = start; i < eof; i++) {
665 q.name = files[i].name;
666 q.len = strlen(files[i].name);
667 q.hash = full_name_hash(q.name, q.len);
668 dentry = __rpc_lookup_create_exclusive(parent, &q);
669 err = PTR_ERR(dentry);
672 switch (files[i].mode & S_IFMT) {
676 err = __rpc_create(dir, dentry,
682 err = __rpc_mkdir(dir, dentry,
690 mutex_unlock(&dir->i_mutex);
693 __rpc_depopulate(parent, files, start, eof);
694 mutex_unlock(&dir->i_mutex);
695 printk(KERN_WARNING "%s: %s failed to populate directory %s\n",
696 __FILE__, __func__, parent->d_name.name);
700 static struct dentry *rpc_mkdir_populate(struct dentry *parent,
701 struct qstr *name, umode_t mode, void *private,
702 int (*populate)(struct dentry *, void *), void *args_populate)
704 struct dentry *dentry;
705 struct inode *dir = parent->d_inode;
708 mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
709 dentry = __rpc_lookup_create_exclusive(parent, name);
712 error = __rpc_mkdir(dir, dentry, mode, NULL, private);
715 if (populate != NULL) {
716 error = populate(dentry, args_populate);
721 mutex_unlock(&dir->i_mutex);
724 __rpc_rmdir(dir, dentry);
726 dentry = ERR_PTR(error);
730 static int rpc_rmdir_depopulate(struct dentry *dentry,
731 void (*depopulate)(struct dentry *))
733 struct dentry *parent;
737 parent = dget_parent(dentry);
738 dir = parent->d_inode;
739 mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
740 if (depopulate != NULL)
742 error = __rpc_rmdir(dir, dentry);
743 mutex_unlock(&dir->i_mutex);
749 * rpc_mkpipe - make an rpc_pipefs file for kernel<->userspace communication
750 * @parent: dentry of directory to create new "pipe" in
751 * @name: name of pipe
752 * @private: private data to associate with the pipe, for the caller's use
753 * @ops: operations defining the behavior of the pipe: upcall, downcall,
754 * release_pipe, open_pipe, and destroy_msg.
755 * @flags: rpc_inode flags
757 * Data is made available for userspace to read by calls to
758 * rpc_queue_upcall(). The actual reads will result in calls to
759 * @ops->upcall, which will be called with the file pointer,
760 * message, and userspace buffer to copy to.
762 * Writes can come at any time, and do not necessarily have to be
763 * responses to upcalls. They will result in calls to @msg->downcall.
765 * The @private argument passed here will be available to all these methods
766 * from the file pointer, via RPC_I(file->f_dentry->d_inode)->private.
768 struct dentry *rpc_mkpipe(struct dentry *parent, const char *name,
769 void *private, const struct rpc_pipe_ops *ops,
772 struct dentry *dentry;
773 struct inode *dir = parent->d_inode;
774 umode_t umode = S_IFIFO | S_IRUSR | S_IWUSR;
778 if (ops->upcall == NULL)
780 if (ops->downcall == NULL)
784 q.len = strlen(name);
785 q.hash = full_name_hash(q.name, q.len),
787 mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
788 dentry = __rpc_lookup_create(parent, &q);
791 if (dentry->d_inode) {
792 struct rpc_inode *rpci = RPC_I(dentry->d_inode);
793 if (rpci->private != private ||
795 rpci->flags != flags) {
800 rpci->nkern_readwriters++;
804 err = __rpc_mkpipe(dir, dentry, umode, &rpc_pipe_fops,
805 private, ops, flags);
809 mutex_unlock(&dir->i_mutex);
812 dentry = ERR_PTR(err);
813 printk(KERN_WARNING "%s: %s() failed to create pipe %s/%s (errno = %d)\n",
814 __FILE__, __func__, parent->d_name.name, name,
818 EXPORT_SYMBOL_GPL(rpc_mkpipe);
821 * rpc_unlink - remove a pipe
822 * @dentry: dentry for the pipe, as returned from rpc_mkpipe
824 * After this call, lookups will no longer find the pipe, and any
825 * attempts to read or write using preexisting opens of the pipe will
829 rpc_unlink(struct dentry *dentry)
831 struct dentry *parent;
835 parent = dget_parent(dentry);
836 dir = parent->d_inode;
837 mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
838 error = __rpc_rmpipe(dir, dentry);
839 mutex_unlock(&dir->i_mutex);
843 EXPORT_SYMBOL_GPL(rpc_unlink);
850 static const struct rpc_filelist authfiles[] = {
853 .i_fop = &rpc_info_operations,
854 .mode = S_IFREG | S_IRUSR,
858 static int rpc_clntdir_populate(struct dentry *dentry, void *private)
860 return rpc_populate(dentry,
861 authfiles, RPCAUTH_info, RPCAUTH_EOF,
865 static void rpc_clntdir_depopulate(struct dentry *dentry)
867 rpc_depopulate(dentry, authfiles, RPCAUTH_info, RPCAUTH_EOF);
871 * rpc_create_client_dir - Create a new rpc_client directory in rpc_pipefs
872 * @dentry: dentry from the rpc_pipefs root to the new directory
873 * @name: &struct qstr for the name
874 * @rpc_client: rpc client to associate with this directory
876 * This creates a directory at the given @path associated with
877 * @rpc_clnt, which will contain a file named "info" with some basic
878 * information about the client, together with any "pipes" that may
879 * later be created using rpc_mkpipe().
881 struct dentry *rpc_create_client_dir(struct dentry *dentry,
883 struct rpc_clnt *rpc_client)
885 return rpc_mkdir_populate(dentry, name, S_IRUGO | S_IXUGO, NULL,
886 rpc_clntdir_populate, rpc_client);
890 * rpc_remove_client_dir - Remove a directory created with rpc_create_client_dir()
891 * @dentry: directory to remove
893 int rpc_remove_client_dir(struct dentry *dentry)
895 return rpc_rmdir_depopulate(dentry, rpc_clntdir_depopulate);
898 static const struct rpc_filelist cache_pipefs_files[3] = {
901 .i_fop = &cache_file_operations_pipefs,
902 .mode = S_IFREG|S_IRUSR|S_IWUSR,
906 .i_fop = &content_file_operations_pipefs,
907 .mode = S_IFREG|S_IRUSR,
911 .i_fop = &cache_flush_operations_pipefs,
912 .mode = S_IFREG|S_IRUSR|S_IWUSR,
916 static int rpc_cachedir_populate(struct dentry *dentry, void *private)
918 return rpc_populate(dentry,
919 cache_pipefs_files, 0, 3,
923 static void rpc_cachedir_depopulate(struct dentry *dentry)
925 rpc_depopulate(dentry, cache_pipefs_files, 0, 3);
928 struct dentry *rpc_create_cache_dir(struct dentry *parent, struct qstr *name,
929 mode_t umode, struct cache_detail *cd)
931 return rpc_mkdir_populate(parent, name, umode, NULL,
932 rpc_cachedir_populate, cd);
935 void rpc_remove_cache_dir(struct dentry *dentry)
937 rpc_rmdir_depopulate(dentry, rpc_cachedir_depopulate);
941 * populate the filesystem
943 static const struct super_operations s_ops = {
944 .alloc_inode = rpc_alloc_inode,
945 .destroy_inode = rpc_destroy_inode,
946 .statfs = simple_statfs,
949 #define RPCAUTH_GSSMAGIC 0x67596969
952 * We have a single directory with 1 node in it.
965 static const struct rpc_filelist files[] = {
968 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
972 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
976 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
978 [RPCAUTH_portmap] = {
980 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
984 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
986 [RPCAUTH_nfsd4_cb] = {
988 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
992 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
997 rpc_fill_super(struct super_block *sb, void *data, int silent)
1000 struct dentry *root;
1002 sb->s_blocksize = PAGE_CACHE_SIZE;
1003 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
1004 sb->s_magic = RPCAUTH_GSSMAGIC;
1006 sb->s_time_gran = 1;
1008 inode = rpc_get_inode(sb, S_IFDIR | 0755);
1011 sb->s_root = root = d_alloc_root(inode);
1016 if (rpc_populate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF, NULL))
1021 static struct dentry *
1022 rpc_mount(struct file_system_type *fs_type,
1023 int flags, const char *dev_name, void *data)
1025 return mount_single(fs_type, flags, data, rpc_fill_super);
1028 static struct file_system_type rpc_pipe_fs_type = {
1029 .owner = THIS_MODULE,
1030 .name = "rpc_pipefs",
1032 .kill_sb = kill_litter_super,
1036 init_once(void *foo)
1038 struct rpc_inode *rpci = (struct rpc_inode *) foo;
1040 inode_init_once(&rpci->vfs_inode);
1041 rpci->private = NULL;
1044 INIT_LIST_HEAD(&rpci->in_upcall);
1045 INIT_LIST_HEAD(&rpci->in_downcall);
1046 INIT_LIST_HEAD(&rpci->pipe);
1048 init_waitqueue_head(&rpci->waitq);
1049 INIT_DELAYED_WORK(&rpci->queue_timeout,
1050 rpc_timeout_upcall_queue);
1054 int register_rpc_pipefs(void)
1058 rpc_inode_cachep = kmem_cache_create("rpc_inode_cache",
1059 sizeof(struct rpc_inode),
1060 0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1063 if (!rpc_inode_cachep)
1065 err = register_filesystem(&rpc_pipe_fs_type);
1067 kmem_cache_destroy(rpc_inode_cachep);
1074 void unregister_rpc_pipefs(void)
1076 kmem_cache_destroy(rpc_inode_cachep);
1077 unregister_filesystem(&rpc_pipe_fs_type);