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>
30 #include <linux/smp_lock.h>
32 static struct vfsmount *rpc_mount __read_mostly;
33 static int rpc_mount_count;
35 static struct file_system_type rpc_pipe_fs_type;
38 static struct kmem_cache *rpc_inode_cachep __read_mostly;
40 #define RPC_UPCALL_TIMEOUT (30*HZ)
42 static void rpc_purge_list(struct rpc_inode *rpci, struct list_head *head,
43 void (*destroy_msg)(struct rpc_pipe_msg *), int err)
45 struct rpc_pipe_msg *msg;
50 msg = list_entry(head->next, struct rpc_pipe_msg, list);
54 } while (!list_empty(head));
55 wake_up(&rpci->waitq);
59 rpc_timeout_upcall_queue(struct work_struct *work)
62 struct rpc_inode *rpci =
63 container_of(work, struct rpc_inode, queue_timeout.work);
64 struct inode *inode = &rpci->vfs_inode;
65 void (*destroy_msg)(struct rpc_pipe_msg *);
67 spin_lock(&inode->i_lock);
68 if (rpci->ops == NULL) {
69 spin_unlock(&inode->i_lock);
72 destroy_msg = rpci->ops->destroy_msg;
73 if (rpci->nreaders == 0) {
74 list_splice_init(&rpci->pipe, &free_list);
77 spin_unlock(&inode->i_lock);
78 rpc_purge_list(rpci, &free_list, destroy_msg, -ETIMEDOUT);
82 * rpc_queue_upcall - queue an upcall message to userspace
83 * @inode: inode of upcall pipe on which to queue given message
84 * @msg: message to queue
86 * Call with an @inode created by rpc_mkpipe() to queue an upcall.
87 * A userspace process may then later read the upcall by performing a
88 * read on an open file for this inode. It is up to the caller to
89 * initialize the fields of @msg (other than @msg->list) appropriately.
92 rpc_queue_upcall(struct inode *inode, struct rpc_pipe_msg *msg)
94 struct rpc_inode *rpci = RPC_I(inode);
97 spin_lock(&inode->i_lock);
98 if (rpci->ops == NULL)
100 if (rpci->nreaders) {
101 list_add_tail(&msg->list, &rpci->pipe);
102 rpci->pipelen += msg->len;
104 } else if (rpci->flags & RPC_PIPE_WAIT_FOR_OPEN) {
105 if (list_empty(&rpci->pipe))
106 queue_delayed_work(rpciod_workqueue,
107 &rpci->queue_timeout,
109 list_add_tail(&msg->list, &rpci->pipe);
110 rpci->pipelen += msg->len;
114 spin_unlock(&inode->i_lock);
115 wake_up(&rpci->waitq);
118 EXPORT_SYMBOL_GPL(rpc_queue_upcall);
121 rpc_inode_setowner(struct inode *inode, void *private)
123 RPC_I(inode)->private = private;
127 rpc_close_pipes(struct inode *inode)
129 struct rpc_inode *rpci = RPC_I(inode);
130 const struct rpc_pipe_ops *ops;
133 mutex_lock(&inode->i_mutex);
136 LIST_HEAD(free_list);
137 spin_lock(&inode->i_lock);
138 need_release = rpci->nreaders != 0 || rpci->nwriters != 0;
140 list_splice_init(&rpci->in_upcall, &free_list);
141 list_splice_init(&rpci->pipe, &free_list);
144 spin_unlock(&inode->i_lock);
145 rpc_purge_list(rpci, &free_list, ops->destroy_msg, -EPIPE);
147 if (need_release && ops->release_pipe)
148 ops->release_pipe(inode);
149 cancel_delayed_work_sync(&rpci->queue_timeout);
151 rpc_inode_setowner(inode, NULL);
152 mutex_unlock(&inode->i_mutex);
155 static struct inode *
156 rpc_alloc_inode(struct super_block *sb)
158 struct rpc_inode *rpci;
159 rpci = (struct rpc_inode *)kmem_cache_alloc(rpc_inode_cachep, GFP_KERNEL);
162 return &rpci->vfs_inode;
166 rpc_destroy_inode(struct inode *inode)
168 kmem_cache_free(rpc_inode_cachep, RPC_I(inode));
172 rpc_pipe_open(struct inode *inode, struct file *filp)
174 struct rpc_inode *rpci = RPC_I(inode);
178 mutex_lock(&inode->i_mutex);
179 if (rpci->ops == NULL)
181 first_open = rpci->nreaders == 0 && rpci->nwriters == 0;
182 if (first_open && rpci->ops->open_pipe) {
183 res = rpci->ops->open_pipe(inode);
187 if (filp->f_mode & FMODE_READ)
189 if (filp->f_mode & FMODE_WRITE)
193 mutex_unlock(&inode->i_mutex);
198 rpc_pipe_release(struct inode *inode, struct file *filp)
200 struct rpc_inode *rpci = RPC_I(inode);
201 struct rpc_pipe_msg *msg;
204 mutex_lock(&inode->i_mutex);
205 if (rpci->ops == NULL)
207 msg = (struct rpc_pipe_msg *)filp->private_data;
209 spin_lock(&inode->i_lock);
210 msg->errno = -EAGAIN;
211 list_del(&msg->list);
212 spin_unlock(&inode->i_lock);
213 rpci->ops->destroy_msg(msg);
215 if (filp->f_mode & FMODE_WRITE)
217 if (filp->f_mode & FMODE_READ) {
219 if (rpci->nreaders == 0) {
220 LIST_HEAD(free_list);
221 spin_lock(&inode->i_lock);
222 list_splice_init(&rpci->pipe, &free_list);
224 spin_unlock(&inode->i_lock);
225 rpc_purge_list(rpci, &free_list,
226 rpci->ops->destroy_msg, -EAGAIN);
229 last_close = rpci->nwriters == 0 && rpci->nreaders == 0;
230 if (last_close && rpci->ops->release_pipe)
231 rpci->ops->release_pipe(inode);
233 mutex_unlock(&inode->i_mutex);
238 rpc_pipe_read(struct file *filp, char __user *buf, size_t len, loff_t *offset)
240 struct inode *inode = filp->f_path.dentry->d_inode;
241 struct rpc_inode *rpci = RPC_I(inode);
242 struct rpc_pipe_msg *msg;
245 mutex_lock(&inode->i_mutex);
246 if (rpci->ops == NULL) {
250 msg = filp->private_data;
252 spin_lock(&inode->i_lock);
253 if (!list_empty(&rpci->pipe)) {
254 msg = list_entry(rpci->pipe.next,
257 list_move(&msg->list, &rpci->in_upcall);
258 rpci->pipelen -= msg->len;
259 filp->private_data = msg;
262 spin_unlock(&inode->i_lock);
266 /* NOTE: it is up to the callback to update msg->copied */
267 res = rpci->ops->upcall(filp, msg, buf, len);
268 if (res < 0 || msg->len == msg->copied) {
269 filp->private_data = NULL;
270 spin_lock(&inode->i_lock);
271 list_del(&msg->list);
272 spin_unlock(&inode->i_lock);
273 rpci->ops->destroy_msg(msg);
276 mutex_unlock(&inode->i_mutex);
281 rpc_pipe_write(struct file *filp, const char __user *buf, size_t len, loff_t *offset)
283 struct inode *inode = filp->f_path.dentry->d_inode;
284 struct rpc_inode *rpci = RPC_I(inode);
287 mutex_lock(&inode->i_mutex);
289 if (rpci->ops != NULL)
290 res = rpci->ops->downcall(filp, buf, len);
291 mutex_unlock(&inode->i_mutex);
296 rpc_pipe_poll(struct file *filp, struct poll_table_struct *wait)
298 struct rpc_inode *rpci;
299 unsigned int mask = 0;
301 rpci = RPC_I(filp->f_path.dentry->d_inode);
302 poll_wait(filp, &rpci->waitq, wait);
304 mask = POLLOUT | POLLWRNORM;
305 if (rpci->ops == NULL)
306 mask |= POLLERR | POLLHUP;
307 if (filp->private_data || !list_empty(&rpci->pipe))
308 mask |= POLLIN | POLLRDNORM;
313 rpc_pipe_ioctl_unlocked(struct file *filp, unsigned int cmd, unsigned long arg)
315 struct rpc_inode *rpci = RPC_I(filp->f_path.dentry->d_inode);
320 if (rpci->ops == NULL)
323 if (filp->private_data) {
324 struct rpc_pipe_msg *msg;
325 msg = (struct rpc_pipe_msg *)filp->private_data;
326 len += msg->len - msg->copied;
328 return put_user(len, (int __user *)arg);
335 rpc_pipe_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
340 ret = rpc_pipe_ioctl_unlocked(filp, cmd, arg);
346 static const struct file_operations rpc_pipe_fops = {
347 .owner = THIS_MODULE,
349 .read = rpc_pipe_read,
350 .write = rpc_pipe_write,
351 .poll = rpc_pipe_poll,
352 .unlocked_ioctl = rpc_pipe_ioctl,
353 .open = rpc_pipe_open,
354 .release = rpc_pipe_release,
358 rpc_show_info(struct seq_file *m, void *v)
360 struct rpc_clnt *clnt = m->private;
362 seq_printf(m, "RPC server: %s\n", clnt->cl_server);
363 seq_printf(m, "service: %s (%d) version %d\n", clnt->cl_protname,
364 clnt->cl_prog, clnt->cl_vers);
365 seq_printf(m, "address: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_ADDR));
366 seq_printf(m, "protocol: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PROTO));
367 seq_printf(m, "port: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PORT));
372 rpc_info_open(struct inode *inode, struct file *file)
374 struct rpc_clnt *clnt;
375 int ret = single_open(file, rpc_show_info, NULL);
378 struct seq_file *m = file->private_data;
379 mutex_lock(&inode->i_mutex);
380 clnt = RPC_I(inode)->private;
382 kref_get(&clnt->cl_kref);
385 single_release(inode, file);
388 mutex_unlock(&inode->i_mutex);
394 rpc_info_release(struct inode *inode, struct file *file)
396 struct seq_file *m = file->private_data;
397 struct rpc_clnt *clnt = (struct rpc_clnt *)m->private;
400 rpc_release_client(clnt);
401 return single_release(inode, file);
404 static const struct file_operations rpc_info_operations = {
405 .owner = THIS_MODULE,
406 .open = rpc_info_open,
409 .release = rpc_info_release,
414 * Description of fs contents.
416 struct rpc_filelist {
418 const struct file_operations *i_fop;
422 struct vfsmount *rpc_get_mount(void)
426 err = simple_pin_fs(&rpc_pipe_fs_type, &rpc_mount, &rpc_mount_count);
431 EXPORT_SYMBOL_GPL(rpc_get_mount);
433 void rpc_put_mount(void)
435 simple_release_fs(&rpc_mount, &rpc_mount_count);
437 EXPORT_SYMBOL_GPL(rpc_put_mount);
439 static int rpc_delete_dentry(struct dentry *dentry)
444 static const struct dentry_operations rpc_dentry_operations = {
445 .d_delete = rpc_delete_dentry,
448 static struct inode *
449 rpc_get_inode(struct super_block *sb, umode_t mode)
451 struct inode *inode = new_inode(sb);
454 inode->i_mode = mode;
455 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
456 switch(mode & S_IFMT) {
458 inode->i_fop = &simple_dir_operations;
459 inode->i_op = &simple_dir_inode_operations;
467 static int __rpc_create_common(struct inode *dir, struct dentry *dentry,
469 const struct file_operations *i_fop,
474 BUG_ON(!d_unhashed(dentry));
475 inode = rpc_get_inode(dir->i_sb, mode);
478 inode->i_ino = iunique(dir->i_sb, 100);
480 inode->i_fop = i_fop;
482 rpc_inode_setowner(inode, private);
483 d_add(dentry, inode);
486 printk(KERN_WARNING "%s: %s failed to allocate inode for dentry %s\n",
487 __FILE__, __func__, dentry->d_name.name);
492 static int __rpc_create(struct inode *dir, struct dentry *dentry,
494 const struct file_operations *i_fop,
499 err = __rpc_create_common(dir, dentry, S_IFREG | mode, i_fop, private);
502 fsnotify_create(dir, dentry);
506 static int __rpc_mkdir(struct inode *dir, struct dentry *dentry,
508 const struct file_operations *i_fop,
513 err = __rpc_create_common(dir, dentry, S_IFDIR | mode, i_fop, private);
517 fsnotify_mkdir(dir, dentry);
521 static int __rpc_mkpipe(struct inode *dir, struct dentry *dentry,
523 const struct file_operations *i_fop,
525 const struct rpc_pipe_ops *ops,
528 struct rpc_inode *rpci;
531 err = __rpc_create_common(dir, dentry, S_IFIFO | mode, i_fop, private);
534 rpci = RPC_I(dentry->d_inode);
535 rpci->nkern_readwriters = 1;
536 rpci->private = private;
539 fsnotify_create(dir, dentry);
543 static int __rpc_rmdir(struct inode *dir, struct dentry *dentry)
548 ret = simple_rmdir(dir, dentry);
554 static int __rpc_unlink(struct inode *dir, struct dentry *dentry)
559 ret = simple_unlink(dir, dentry);
565 static int __rpc_rmpipe(struct inode *dir, struct dentry *dentry)
567 struct inode *inode = dentry->d_inode;
568 struct rpc_inode *rpci = RPC_I(inode);
570 rpci->nkern_readwriters--;
571 if (rpci->nkern_readwriters != 0)
573 rpc_close_pipes(inode);
574 return __rpc_unlink(dir, dentry);
577 static struct dentry *__rpc_lookup_create(struct dentry *parent,
580 struct dentry *dentry;
582 dentry = d_lookup(parent, name);
584 dentry = d_alloc(parent, name);
586 dentry = ERR_PTR(-ENOMEM);
590 if (!dentry->d_inode)
591 dentry->d_op = &rpc_dentry_operations;
596 static struct dentry *__rpc_lookup_create_exclusive(struct dentry *parent,
599 struct dentry *dentry;
601 dentry = __rpc_lookup_create(parent, name);
604 if (dentry->d_inode == NULL)
607 return ERR_PTR(-EEXIST);
611 * FIXME: This probably has races.
613 static void __rpc_depopulate(struct dentry *parent,
614 const struct rpc_filelist *files,
617 struct inode *dir = parent->d_inode;
618 struct dentry *dentry;
622 for (i = start; i < eof; i++) {
623 name.name = files[i].name;
624 name.len = strlen(files[i].name);
625 name.hash = full_name_hash(name.name, name.len);
626 dentry = d_lookup(parent, &name);
630 if (dentry->d_inode == NULL)
632 switch (dentry->d_inode->i_mode & S_IFMT) {
636 __rpc_unlink(dir, dentry);
639 __rpc_rmdir(dir, dentry);
646 static void rpc_depopulate(struct dentry *parent,
647 const struct rpc_filelist *files,
650 struct inode *dir = parent->d_inode;
652 mutex_lock_nested(&dir->i_mutex, I_MUTEX_CHILD);
653 __rpc_depopulate(parent, files, start, eof);
654 mutex_unlock(&dir->i_mutex);
657 static int rpc_populate(struct dentry *parent,
658 const struct rpc_filelist *files,
662 struct inode *dir = parent->d_inode;
663 struct dentry *dentry;
666 mutex_lock(&dir->i_mutex);
667 for (i = start; i < eof; i++) {
670 q.name = files[i].name;
671 q.len = strlen(files[i].name);
672 q.hash = full_name_hash(q.name, q.len);
673 dentry = __rpc_lookup_create_exclusive(parent, &q);
674 err = PTR_ERR(dentry);
677 switch (files[i].mode & S_IFMT) {
681 err = __rpc_create(dir, dentry,
687 err = __rpc_mkdir(dir, dentry,
695 mutex_unlock(&dir->i_mutex);
698 __rpc_depopulate(parent, files, start, eof);
699 mutex_unlock(&dir->i_mutex);
700 printk(KERN_WARNING "%s: %s failed to populate directory %s\n",
701 __FILE__, __func__, parent->d_name.name);
705 static struct dentry *rpc_mkdir_populate(struct dentry *parent,
706 struct qstr *name, umode_t mode, void *private,
707 int (*populate)(struct dentry *, void *), void *args_populate)
709 struct dentry *dentry;
710 struct inode *dir = parent->d_inode;
713 mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
714 dentry = __rpc_lookup_create_exclusive(parent, name);
717 error = __rpc_mkdir(dir, dentry, mode, NULL, private);
720 if (populate != NULL) {
721 error = populate(dentry, args_populate);
726 mutex_unlock(&dir->i_mutex);
729 __rpc_rmdir(dir, dentry);
731 dentry = ERR_PTR(error);
735 static int rpc_rmdir_depopulate(struct dentry *dentry,
736 void (*depopulate)(struct dentry *))
738 struct dentry *parent;
742 parent = dget_parent(dentry);
743 dir = parent->d_inode;
744 mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
745 if (depopulate != NULL)
747 error = __rpc_rmdir(dir, dentry);
748 mutex_unlock(&dir->i_mutex);
754 * rpc_mkpipe - make an rpc_pipefs file for kernel<->userspace communication
755 * @parent: dentry of directory to create new "pipe" in
756 * @name: name of pipe
757 * @private: private data to associate with the pipe, for the caller's use
758 * @ops: operations defining the behavior of the pipe: upcall, downcall,
759 * release_pipe, open_pipe, and destroy_msg.
760 * @flags: rpc_inode flags
762 * Data is made available for userspace to read by calls to
763 * rpc_queue_upcall(). The actual reads will result in calls to
764 * @ops->upcall, which will be called with the file pointer,
765 * message, and userspace buffer to copy to.
767 * Writes can come at any time, and do not necessarily have to be
768 * responses to upcalls. They will result in calls to @msg->downcall.
770 * The @private argument passed here will be available to all these methods
771 * from the file pointer, via RPC_I(file->f_dentry->d_inode)->private.
773 struct dentry *rpc_mkpipe(struct dentry *parent, const char *name,
774 void *private, const struct rpc_pipe_ops *ops,
777 struct dentry *dentry;
778 struct inode *dir = parent->d_inode;
779 umode_t umode = S_IFIFO | S_IRUSR | S_IWUSR;
783 if (ops->upcall == NULL)
785 if (ops->downcall == NULL)
789 q.len = strlen(name);
790 q.hash = full_name_hash(q.name, q.len),
792 mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
793 dentry = __rpc_lookup_create(parent, &q);
796 if (dentry->d_inode) {
797 struct rpc_inode *rpci = RPC_I(dentry->d_inode);
798 if (rpci->private != private ||
800 rpci->flags != flags) {
805 rpci->nkern_readwriters++;
809 err = __rpc_mkpipe(dir, dentry, umode, &rpc_pipe_fops,
810 private, ops, flags);
814 mutex_unlock(&dir->i_mutex);
817 dentry = ERR_PTR(err);
818 printk(KERN_WARNING "%s: %s() failed to create pipe %s/%s (errno = %d)\n",
819 __FILE__, __func__, parent->d_name.name, name,
823 EXPORT_SYMBOL_GPL(rpc_mkpipe);
826 * rpc_unlink - remove a pipe
827 * @dentry: dentry for the pipe, as returned from rpc_mkpipe
829 * After this call, lookups will no longer find the pipe, and any
830 * attempts to read or write using preexisting opens of the pipe will
834 rpc_unlink(struct dentry *dentry)
836 struct dentry *parent;
840 parent = dget_parent(dentry);
841 dir = parent->d_inode;
842 mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
843 error = __rpc_rmpipe(dir, dentry);
844 mutex_unlock(&dir->i_mutex);
848 EXPORT_SYMBOL_GPL(rpc_unlink);
855 static const struct rpc_filelist authfiles[] = {
858 .i_fop = &rpc_info_operations,
859 .mode = S_IFREG | S_IRUSR,
863 static int rpc_clntdir_populate(struct dentry *dentry, void *private)
865 return rpc_populate(dentry,
866 authfiles, RPCAUTH_info, RPCAUTH_EOF,
870 static void rpc_clntdir_depopulate(struct dentry *dentry)
872 rpc_depopulate(dentry, authfiles, RPCAUTH_info, RPCAUTH_EOF);
876 * rpc_create_client_dir - Create a new rpc_client directory in rpc_pipefs
877 * @dentry: dentry from the rpc_pipefs root to the new directory
878 * @name: &struct qstr for the name
879 * @rpc_client: rpc client to associate with this directory
881 * This creates a directory at the given @path associated with
882 * @rpc_clnt, which will contain a file named "info" with some basic
883 * information about the client, together with any "pipes" that may
884 * later be created using rpc_mkpipe().
886 struct dentry *rpc_create_client_dir(struct dentry *dentry,
888 struct rpc_clnt *rpc_client)
890 return rpc_mkdir_populate(dentry, name, S_IRUGO | S_IXUGO, NULL,
891 rpc_clntdir_populate, rpc_client);
895 * rpc_remove_client_dir - Remove a directory created with rpc_create_client_dir()
896 * @dentry: directory to remove
898 int rpc_remove_client_dir(struct dentry *dentry)
900 return rpc_rmdir_depopulate(dentry, rpc_clntdir_depopulate);
903 static const struct rpc_filelist cache_pipefs_files[3] = {
906 .i_fop = &cache_file_operations_pipefs,
907 .mode = S_IFREG|S_IRUSR|S_IWUSR,
911 .i_fop = &content_file_operations_pipefs,
912 .mode = S_IFREG|S_IRUSR,
916 .i_fop = &cache_flush_operations_pipefs,
917 .mode = S_IFREG|S_IRUSR|S_IWUSR,
921 static int rpc_cachedir_populate(struct dentry *dentry, void *private)
923 return rpc_populate(dentry,
924 cache_pipefs_files, 0, 3,
928 static void rpc_cachedir_depopulate(struct dentry *dentry)
930 rpc_depopulate(dentry, cache_pipefs_files, 0, 3);
933 struct dentry *rpc_create_cache_dir(struct dentry *parent, struct qstr *name,
934 mode_t umode, struct cache_detail *cd)
936 return rpc_mkdir_populate(parent, name, umode, NULL,
937 rpc_cachedir_populate, cd);
940 void rpc_remove_cache_dir(struct dentry *dentry)
942 rpc_rmdir_depopulate(dentry, rpc_cachedir_depopulate);
946 * populate the filesystem
948 static const struct super_operations s_ops = {
949 .alloc_inode = rpc_alloc_inode,
950 .destroy_inode = rpc_destroy_inode,
951 .statfs = simple_statfs,
954 #define RPCAUTH_GSSMAGIC 0x67596969
957 * We have a single directory with 1 node in it.
970 static const struct rpc_filelist files[] = {
973 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
977 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
981 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
983 [RPCAUTH_portmap] = {
985 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
989 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
991 [RPCAUTH_nfsd4_cb] = {
993 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
997 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
1002 rpc_fill_super(struct super_block *sb, void *data, int silent)
1004 struct inode *inode;
1005 struct dentry *root;
1007 sb->s_blocksize = PAGE_CACHE_SIZE;
1008 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
1009 sb->s_magic = RPCAUTH_GSSMAGIC;
1011 sb->s_time_gran = 1;
1013 inode = rpc_get_inode(sb, S_IFDIR | 0755);
1016 sb->s_root = root = d_alloc_root(inode);
1021 if (rpc_populate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF, NULL))
1027 rpc_get_sb(struct file_system_type *fs_type,
1028 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
1030 return get_sb_single(fs_type, flags, data, rpc_fill_super, mnt);
1033 static struct file_system_type rpc_pipe_fs_type = {
1034 .owner = THIS_MODULE,
1035 .name = "rpc_pipefs",
1036 .get_sb = rpc_get_sb,
1037 .kill_sb = kill_litter_super,
1041 init_once(void *foo)
1043 struct rpc_inode *rpci = (struct rpc_inode *) foo;
1045 inode_init_once(&rpci->vfs_inode);
1046 rpci->private = NULL;
1049 INIT_LIST_HEAD(&rpci->in_upcall);
1050 INIT_LIST_HEAD(&rpci->in_downcall);
1051 INIT_LIST_HEAD(&rpci->pipe);
1053 init_waitqueue_head(&rpci->waitq);
1054 INIT_DELAYED_WORK(&rpci->queue_timeout,
1055 rpc_timeout_upcall_queue);
1059 int register_rpc_pipefs(void)
1063 rpc_inode_cachep = kmem_cache_create("rpc_inode_cache",
1064 sizeof(struct rpc_inode),
1065 0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1068 if (!rpc_inode_cachep)
1070 err = register_filesystem(&rpc_pipe_fs_type);
1072 kmem_cache_destroy(rpc_inode_cachep);
1079 void unregister_rpc_pipefs(void)
1081 kmem_cache_destroy(rpc_inode_cachep);
1082 unregister_filesystem(&rpc_pipe_fs_type);