--- /dev/null
+/*
+ * net/sunrpc/rpc_pipe.c
+ *
+ * Userland/kernel interface for rpcauth_gss.
+ * Code shamelessly plagiarized from fs/nfsd/nfsctl.c
+ * and fs/driverfs/inode.c
+ *
+ * Copyright (c) 2002, Trond Myklebust <trond.myklebust@fys.uio.no>
+ *
+ */
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/version.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/pagemap.h>
+#include <linux/mount.h>
+#include <linux/namei.h>
+#include <linux/dnotify.h>
+#include <linux/kernel.h>
+
+#include <asm/ioctls.h>
+#include <linux/fs.h>
+#include <linux/poll.h>
+#include <linux/wait.h>
+#include <linux/seq_file.h>
+
+#include <linux/sunrpc/clnt.h>
+#include <linux/sunrpc/rpc_pipe_fs.h>
+
+static struct vfsmount *rpc_mount;
+static spinlock_t rpc_mount_lock = SPIN_LOCK_UNLOCKED;
+static int rpc_mount_count;
+
+static struct file_system_type rpc_pipe_fs_type;
+
+
+static kmem_cache_t *rpc_inode_cachep;
+
+static void
+__rpc_purge_upcall(struct inode *inode, int err)
+{
+ struct rpc_inode *rpci = RPC_I(inode);
+ struct rpc_pipe_msg *msg;
+
+ while (!list_empty(&rpci->pipe)) {
+ msg = list_entry(rpci->pipe.next, struct rpc_pipe_msg, list);
+ list_del_init(&msg->list);
+ msg->errno = err;
+ rpci->ops->destroy_msg(msg);
+ }
+ rpci->pipelen = 0;
+ wake_up(&rpci->waitq);
+}
+
+void
+rpc_purge_upcall(struct inode *inode, int err)
+{
+ down(&inode->i_sem);
+ __rpc_purge_upcall(inode, err);
+ up(&inode->i_sem);
+}
+
+/*
+ * XXX should only be called in ->downcall
+ */
+void
+__rpc_purge_current_upcall(struct file *filp)
+{
+ struct rpc_pipe_msg *msg;
+
+ msg = filp->private_data;
+ filp->private_data = NULL;
+
+ if (msg != NULL)
+ msg->errno = 0;
+}
+
+int
+rpc_queue_upcall(struct inode *inode, struct rpc_pipe_msg *msg)
+{
+ struct rpc_inode *rpci = RPC_I(inode);
+ int res = 0;
+
+ down(&inode->i_sem);
+ if (rpci->nreaders) {
+ list_add_tail(&msg->list, &rpci->pipe);
+ rpci->pipelen += msg->len;
+ } else
+ res = -EPIPE;
+ up(&inode->i_sem);
+ wake_up(&rpci->waitq);
+ return res;
+}
+
+void
+rpc_inode_setowner(struct inode *inode, void *private)
+{
+ struct rpc_inode *rpci = RPC_I(inode);
+ down(&inode->i_sem);
+ rpci->private = private;
+ if (!private)
+ __rpc_purge_upcall(inode, -EPIPE);
+ up(&inode->i_sem);
+}
+
+static struct inode *
+rpc_alloc_inode(struct super_block *sb)
+{
+ struct rpc_inode *rpci;
+ rpci = (struct rpc_inode *)kmem_cache_alloc(rpc_inode_cachep, SLAB_KERNEL);
+ if (!rpci)
+ return NULL;
+ return &rpci->vfs_inode;
+}
+
+static void
+rpc_destroy_inode(struct inode *inode)
+{
+ kmem_cache_free(rpc_inode_cachep, RPC_I(inode));
+}
+
+static int
+rpc_pipe_open(struct inode *inode, struct file *filp)
+{
+ struct rpc_inode *rpci = RPC_I(inode);
+ int res = -ENXIO;
+
+ down(&inode->i_sem);
+ if (rpci->private != NULL) {
+ if (filp->f_mode & FMODE_READ)
+ rpci->nreaders ++;
+ res = 0;
+ }
+ up(&inode->i_sem);
+ return res;
+}
+
+static int
+rpc_pipe_release(struct inode *inode, struct file *filp)
+{
+ struct rpc_inode *rpci = RPC_I(filp->f_dentry->d_inode);
+ struct rpc_pipe_msg *msg;
+
+ msg = (struct rpc_pipe_msg *)filp->private_data;
+ if (msg != NULL) {
+ msg->errno = -EPIPE;
+ rpci->ops->destroy_msg(msg);
+ }
+ down(&inode->i_sem);
+ if (filp->f_mode & FMODE_READ)
+ rpci->nreaders --;
+ if (!rpci->nreaders)
+ __rpc_purge_upcall(inode, -EPIPE);
+ up(&inode->i_sem);
+ return 0;
+}
+
+static ssize_t
+rpc_pipe_read(struct file *filp, char *buf, size_t len, loff_t *offset)
+{
+ struct inode *inode = filp->f_dentry->d_inode;
+ struct rpc_inode *rpci = RPC_I(inode);
+ struct rpc_pipe_msg *msg;
+ int res = 0;
+
+ down(&inode->i_sem);
+ if (!rpci->private) {
+ res = -EPIPE;
+ goto out_unlock;
+ }
+ msg = filp->private_data;
+ if (msg == NULL) {
+ if (!list_empty(&rpci->pipe)) {
+ msg = list_entry(rpci->pipe.next,
+ struct rpc_pipe_msg,
+ list);
+ list_del_init(&msg->list);
+ rpci->pipelen -= msg->len;
+ filp->private_data = msg;
+ }
+ if (msg == NULL)
+ goto out_unlock;
+ }
+ res = rpci->ops->upcall(filp, msg, buf, len);
+ if (res < 0 || msg->len == msg->copied) {
+ filp->private_data = NULL;
+ msg->errno = 0;
+ rpci->ops->destroy_msg(msg);
+ }
+out_unlock:
+ up(&inode->i_sem);
+ return res;
+}
+
+static ssize_t
+rpc_pipe_write(struct file *filp, const char *buf, size_t len, loff_t *offset)
+{
+ struct inode *inode = filp->f_dentry->d_inode;
+ struct rpc_inode *rpci = RPC_I(inode);
+ int res;
+
+ down(&inode->i_sem);
+ res = -EPIPE;
+ if (rpci->private != NULL)
+ res = rpci->ops->downcall(filp, buf, len);
+ up(&inode->i_sem);
+ return res;
+}
+
+static unsigned int
+rpc_pipe_poll(struct file *filp, struct poll_table_struct *wait)
+{
+ struct rpc_inode *rpci;
+ unsigned int mask = 0;
+
+ rpci = RPC_I(filp->f_dentry->d_inode);
+ poll_wait(filp, &rpci->waitq, wait);
+
+ mask = POLLOUT | POLLWRNORM;
+ if (rpci->private == NULL)
+ mask |= POLLERR | POLLHUP;
+ if (!list_empty(&rpci->pipe))
+ mask |= POLLIN | POLLRDNORM;
+ return mask;
+}
+
+static int
+rpc_pipe_ioctl(struct inode *ino, struct file *filp,
+ unsigned int cmd, unsigned long arg)
+{
+ struct rpc_inode *rpci = RPC_I(filp->f_dentry->d_inode);
+ int len;
+
+ switch (cmd) {
+ case FIONREAD:
+ if (!rpci->private)
+ return -EPIPE;
+ len = rpci->pipelen;
+ if (filp->private_data) {
+ struct rpc_pipe_msg *msg;
+ msg = (struct rpc_pipe_msg *)filp->private_data;
+ len += msg->len - msg->copied;
+ }
+ return put_user(len, (int *)arg);
+ default:
+ return -EINVAL;
+ }
+}
+
+struct inode_operations rpc_pipe_iops = {
+ .lookup = simple_lookup,
+};
+
+
+struct file_operations rpc_pipe_fops = {
+ .owner = THIS_MODULE,
+ .llseek = no_llseek,
+ .read = rpc_pipe_read,
+ .write = rpc_pipe_write,
+ .poll = rpc_pipe_poll,
+ .ioctl = rpc_pipe_ioctl,
+ .open = rpc_pipe_open,
+ .release = rpc_pipe_release,
+};
+
+static int
+rpc_show_info(struct seq_file *m, void *v)
+{
+ struct rpc_clnt *clnt = m->private;
+
+ seq_printf(m, "RPC server: %s\n", clnt->cl_server);
+ seq_printf(m, "service: %s (%d) version %d\n", clnt->cl_protname,
+ clnt->cl_prog, clnt->cl_vers);
+ seq_printf(m, "address: %u.%u.%u.%u\n",
+ NIPQUAD(clnt->cl_xprt->addr.sin_addr.s_addr));
+ return 0;
+}
+
+static int
+rpc_info_open(struct inode *inode, struct file *file)
+{
+ struct rpc_clnt *clnt;
+ int ret = single_open(file, rpc_show_info, NULL);
+
+ if (!ret) {
+ struct seq_file *m = file->private_data;
+ down(&inode->i_sem);
+ clnt = RPC_I(inode)->private;
+ if (clnt) {
+ atomic_inc(&clnt->cl_users);
+ m->private = clnt;
+ } else {
+ single_release(inode, file);
+ ret = -EINVAL;
+ }
+ up(&inode->i_sem);
+ }
+ return ret;
+}
+
+static int
+rpc_info_release(struct inode *inode, struct file *file)
+{
+ struct seq_file *m = file->private_data;
+ struct rpc_clnt *clnt = (struct rpc_clnt *)m->private;
+
+ if (clnt)
+ rpc_release_client(clnt);
+ return single_release(inode, file);
+}
+
+static struct file_operations rpc_info_operations = {
+ .open = rpc_info_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = rpc_info_release,
+};
+
+
+/*
+ * We have a single directory with 1 node in it.
+ */
+enum {
+ RPCAUTH_Root = 1,
+ RPCAUTH_lockd,
+ RPCAUTH_nfs,
+ RPCAUTH_portmap,
+ RPCAUTH_statd,
+ RPCAUTH_RootEOF
+};
+
+/*
+ * Description of fs contents.
+ */
+struct rpc_filelist {
+ char *name;
+ struct file_operations *i_fop;
+ int mode;
+};
+
+static struct rpc_filelist files[] = {
+ [RPCAUTH_lockd] = {
+ .name = "lockd",
+ .mode = S_IFDIR | S_IRUSR | S_IXUSR,
+ },
+ [RPCAUTH_nfs] = {
+ .name = "nfs",
+ .mode = S_IFDIR | S_IRUSR | S_IXUSR,
+ },
+ [RPCAUTH_portmap] = {
+ .name = "portmap",
+ .mode = S_IFDIR | S_IRUSR | S_IXUSR,
+ },
+ [RPCAUTH_statd] = {
+ .name = "statd",
+ .mode = S_IFDIR | S_IRUSR | S_IXUSR,
+ },
+};
+
+enum {
+ RPCAUTH_info = 2,
+ RPCAUTH_EOF
+};
+
+static struct rpc_filelist authfiles[] = {
+ [RPCAUTH_info] = {
+ .name = "info",
+ .i_fop = &rpc_info_operations,
+ .mode = S_IFREG | S_IRUSR,
+ },
+};
+
+static int
+rpc_get_mount(void)
+{
+ struct vfsmount * mnt = NULL;
+
+ spin_lock(&rpc_mount_lock);
+ if (rpc_mount)
+ goto out_get;
+ spin_unlock(&rpc_mount_lock);
+ mnt = kern_mount(&rpc_pipe_fs_type);
+ if (IS_ERR(mnt))
+ return -ENODEV;
+ spin_lock(&rpc_mount_lock);
+ if (!rpc_mount) {
+ rpc_mount = mnt;
+ mnt = NULL;
+ goto out_dontget;
+ }
+out_get:
+ mntget(rpc_mount);
+out_dontget:
+ ++rpc_mount_count;
+ spin_unlock(&rpc_mount_lock);
+ if (mnt)
+ mntput(mnt);
+ return 0;
+}
+
+static void
+rpc_put_mount(void)
+{
+ struct vfsmount *mnt;
+
+ spin_lock(&rpc_mount_lock);
+ mnt = rpc_mount;
+ --rpc_mount_count;
+ if (rpc_mount_count == 0)
+ rpc_mount = NULL;
+ else
+ mnt = NULL;
+ spin_unlock(&rpc_mount_lock);
+ if (mnt)
+ mntput(mnt);
+}
+
+static int
+rpc_lookup_path(char *path, struct nameidata *nd, int flags)
+{
+ if (rpc_get_mount()) {
+ printk(KERN_WARNING "%s: %s failed to mount "
+ "pseudofilesystem \n", __FILE__, __FUNCTION__);
+ return -ENODEV;
+ }
+ nd->mnt = mntget(rpc_mount);
+ nd->dentry = dget(rpc_mount->mnt_sb->s_root);
+ nd->last_type = LAST_ROOT;
+ nd->flags = flags;
+
+ if (path_walk(path, nd)) {
+ printk(KERN_WARNING "%s: %s failed to find path %s\n",
+ __FILE__, __FUNCTION__, path);
+ rpc_put_mount();
+ return -ENOENT;
+ }
+ return 0;
+}
+
+static void
+rpc_release_path(struct nameidata *nd)
+{
+ path_release(nd);
+ rpc_put_mount();
+}
+
+static struct inode *
+rpc_get_inode(struct super_block *sb, int mode)
+{
+ struct inode *inode = new_inode(sb);
+ if (!inode)
+ return NULL;
+ inode->i_mode = mode;
+ inode->i_uid = inode->i_gid = 0;
+ inode->i_blksize = PAGE_CACHE_SIZE;
+ inode->i_blocks = 0;
+ inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
+ switch(mode & S_IFMT) {
+ case S_IFDIR:
+ inode->i_fop = &simple_dir_operations;
+ inode->i_op = &simple_dir_inode_operations;
+ inode->i_nlink++;
+ default:
+ break;
+ }
+ return inode;
+}
+
+/*
+ * FIXME: This probably has races.
+ */
+static void
+rpc_depopulate(struct dentry *dir)
+{
+ LIST_HEAD(head);
+ struct list_head *pos, *next;
+ struct dentry *dentry;
+
+ down(&dir->d_inode->i_sem);
+ spin_lock(&dcache_lock);
+ list_for_each_safe(pos, next, &dir->d_subdirs) {
+ dentry = list_entry(pos, struct dentry, d_child);
+ if (!d_unhashed(dentry)) {
+ dget_locked(dentry);
+ list_del(&dentry->d_hash);
+ list_add(&dentry->d_hash, &head);
+ }
+ }
+ spin_unlock(&dcache_lock);
+ while (!list_empty(&head)) {
+ dentry = list_entry(head.next, struct dentry, d_hash);
+ list_del_init(&dentry->d_hash);
+ if (dentry->d_inode) {
+ rpc_inode_setowner(dentry->d_inode, NULL);
+ simple_unlink(dir->d_inode, dentry);
+ }
+ dput(dentry);
+ }
+ up(&dir->d_inode->i_sem);
+}
+
+static int
+rpc_populate(struct dentry *dir,
+ struct rpc_filelist *files,
+ int start, int eof)
+{
+ void *private = RPC_I(dir->d_inode)->private;
+ struct qstr name;
+ struct dentry *dentry;
+ struct inode *inode;
+ int mode, i;
+ for (i = start; i < eof; i++) {
+ name.name = files[i].name;
+ name.len = strlen(name.name);
+ name.hash = full_name_hash(name.name, name.len);
+ dentry = d_alloc(dir, &name);
+ if (!dentry)
+ goto out_bad;
+ mode = files[i].mode;
+ inode = rpc_get_inode(dir->d_inode->i_sb, mode);
+ if (!inode) {
+ dput(dentry);
+ goto out_bad;
+ }
+ inode->i_ino = i;
+ if (files[i].i_fop)
+ inode->i_fop = files[i].i_fop;
+ if (private)
+ rpc_inode_setowner(inode, private);
+ if (S_ISDIR(mode))
+ dir->d_inode->i_nlink++;
+ d_add(dentry, inode);
+ }
+ return 0;
+out_bad:
+ printk(KERN_WARNING "%s: %s failed to populate directory %s\n",
+ __FILE__, __FUNCTION__, dir->d_name.name);
+ return -ENOMEM;
+}
+
+static int
+__rpc_mkdir(struct inode *dir, struct dentry *dentry)
+{
+ struct inode *inode;
+
+ inode = rpc_get_inode(dir->i_sb, S_IFDIR | S_IRUSR | S_IXUSR);
+ if (!inode)
+ goto out_err;
+ inode->i_ino = iunique(dir->i_sb, 100);
+ d_instantiate(dentry, inode);
+ dir->i_nlink++;
+ inode_dir_notify(dir, DN_CREATE);
+ rpc_get_mount();
+ return 0;
+out_err:
+ printk(KERN_WARNING "%s: %s failed to allocate inode for dentry %s\n",
+ __FILE__, __FUNCTION__, dentry->d_name.name);
+ return -ENOMEM;
+}
+
+static int
+__rpc_rmdir(struct inode *dir, struct dentry *dentry)
+{
+ int error;
+
+ rpc_inode_setowner(dentry->d_inode, NULL);
+ if ((error = simple_rmdir(dir, dentry)) != 0)
+ return error;
+ if (!error) {
+ inode_dir_notify(dir, DN_DELETE);
+ d_drop(dentry);
+ rpc_put_mount();
+ }
+ return 0;
+}
+
+struct dentry *
+rpc_lookup_negative(char *path, struct nameidata *nd)
+{
+ struct dentry *dentry;
+ struct inode *dir;
+ int error;
+
+ if ((error = rpc_lookup_path(path, nd, LOOKUP_PARENT)) != 0)
+ return ERR_PTR(error);
+ dir = nd->dentry->d_inode;
+ down(&dir->i_sem);
+ dentry = lookup_hash(&nd->last, nd->dentry);
+ if (IS_ERR(dentry))
+ goto out_err;
+ if (dentry->d_inode) {
+ dput(dentry);
+ dentry = ERR_PTR(-EEXIST);
+ goto out_err;
+ }
+ return dentry;
+out_err:
+ up(&dir->i_sem);
+ rpc_release_path(nd);
+ return dentry;
+}
+
+
+struct dentry *
+rpc_mkdir(char *path, struct rpc_clnt *rpc_client)
+{
+ struct nameidata nd;
+ struct dentry *dentry;
+ struct inode *dir;
+ int error;
+
+ dentry = rpc_lookup_negative(path, &nd);
+ if (IS_ERR(dentry))
+ return dentry;
+ dir = nd.dentry->d_inode;
+ if ((error = __rpc_mkdir(dir, dentry)) != 0)
+ goto err_dput;
+ RPC_I(dentry->d_inode)->private = rpc_client;
+ error = rpc_populate(dentry, authfiles,
+ RPCAUTH_info, RPCAUTH_EOF);
+ if (error)
+ goto err_depopulate;
+out:
+ up(&dir->i_sem);
+ rpc_release_path(&nd);
+ return dentry;
+err_depopulate:
+ rpc_depopulate(dentry);
+ __rpc_rmdir(dir, dentry);
+err_dput:
+ dput(dentry);
+ printk(KERN_WARNING "%s: %s() failed to create directory %s (errno = %d)\n",
+ __FILE__, __FUNCTION__, path, error);
+ dentry = ERR_PTR(error);
+ goto out;
+}
+
+int
+rpc_rmdir(char *path)
+{
+ struct nameidata nd;
+ struct dentry *dentry;
+ struct inode *dir;
+ int error;
+
+ if ((error = rpc_lookup_path(path, &nd, LOOKUP_PARENT)) != 0)
+ return error;
+ dir = nd.dentry->d_inode;
+ down(&dir->i_sem);
+ dentry = lookup_hash(&nd.last, nd.dentry);
+ if (IS_ERR(dentry)) {
+ error = PTR_ERR(dentry);
+ goto out_release;
+ }
+ rpc_depopulate(dentry);
+ error = __rpc_rmdir(dir, dentry);
+ dput(dentry);
+out_release:
+ up(&dir->i_sem);
+ rpc_release_path(&nd);
+ return error;
+}
+
+struct dentry *
+rpc_mkpipe(char *path, void *private, struct rpc_pipe_ops *ops)
+{
+ struct nameidata nd;
+ struct dentry *dentry;
+ struct inode *dir, *inode;
+ struct rpc_inode *rpci;
+
+ dentry = rpc_lookup_negative(path, &nd);
+ if (IS_ERR(dentry))
+ return dentry;
+ dir = nd.dentry->d_inode;
+ inode = rpc_get_inode(dir->i_sb, S_IFSOCK | S_IRUSR | S_IXUSR);
+ if (!inode)
+ goto err_dput;
+ inode->i_ino = iunique(dir->i_sb, 100);
+ inode->i_fop = &rpc_pipe_fops;
+ d_instantiate(dentry, inode);
+ rpci = RPC_I(inode);
+ rpci->private = private;
+ rpci->ops = ops;
+ inode_dir_notify(dir, DN_CREATE);
+out:
+ up(&dir->i_sem);
+ rpc_release_path(&nd);
+ return dentry;
+err_dput:
+ dput(dentry);
+ dentry = ERR_PTR(-ENOMEM);
+ printk(KERN_WARNING "%s: %s() failed to create pipe %s (errno = %d)\n",
+ __FILE__, __FUNCTION__, path, -ENOMEM);
+ goto out;
+}
+
+int
+rpc_unlink(char *path)
+{
+ struct nameidata nd;
+ struct dentry *dentry;
+ struct inode *dir;
+ int error;
+
+ if ((error = rpc_lookup_path(path, &nd, LOOKUP_PARENT)) != 0)
+ return error;
+ dir = nd.dentry->d_inode;
+ down(&dir->i_sem);
+ dentry = lookup_hash(&nd.last, nd.dentry);
+ if (IS_ERR(dentry)) {
+ error = PTR_ERR(dentry);
+ goto out_release;
+ }
+ d_drop(dentry);
+ if (dentry->d_inode) {
+ rpc_inode_setowner(dentry->d_inode, NULL);
+ error = simple_unlink(dir, dentry);
+ }
+ dput(dentry);
+ inode_dir_notify(dir, DN_DELETE);
+out_release:
+ up(&dir->i_sem);
+ rpc_release_path(&nd);
+ return error;
+}
+
+/*
+ * populate the filesystem
+ */
+static struct super_operations s_ops = {
+ .alloc_inode = rpc_alloc_inode,
+ .destroy_inode = rpc_destroy_inode,
+ .statfs = simple_statfs,
+};
+
+#define RPCAUTH_GSSMAGIC 0x67596969
+
+static int
+rpc_fill_super(struct super_block *sb, void *data, int silent)
+{
+ struct inode *inode;
+ struct dentry *root;
+
+ sb->s_blocksize = PAGE_CACHE_SIZE;
+ sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
+ sb->s_magic = RPCAUTH_GSSMAGIC;
+ sb->s_op = &s_ops;
+
+ inode = rpc_get_inode(sb, S_IFDIR | 0755);
+ if (!inode)
+ return -ENOMEM;
+ root = d_alloc_root(inode);
+ if (!root) {
+ iput(inode);
+ return -ENOMEM;
+ }
+ if (rpc_populate(root, files, RPCAUTH_Root + 1, RPCAUTH_RootEOF))
+ goto out;
+ sb->s_root = root;
+ return 0;
+out:
+ d_genocide(root);
+ dput(root);
+ return -ENOMEM;
+}
+
+static struct super_block *
+rpc_get_sb(struct file_system_type *fs_type,
+ int flags, char *dev_name, void *data)
+{
+ return get_sb_single(fs_type, flags, data, rpc_fill_super);
+}
+
+static struct file_system_type rpc_pipe_fs_type = {
+ .owner = THIS_MODULE,
+ .name = "rpc_pipefs",
+ .get_sb = rpc_get_sb,
+ .kill_sb = kill_litter_super,
+};
+
+static void
+init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
+{
+ struct rpc_inode *rpci = (struct rpc_inode *) foo;
+
+ if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
+ SLAB_CTOR_CONSTRUCTOR) {
+ inode_init_once(&rpci->vfs_inode);
+ rpci->private = NULL;
+ rpci->nreaders = 0;
+ INIT_LIST_HEAD(&rpci->pipe);
+ rpci->pipelen = 0;
+ init_waitqueue_head(&rpci->waitq);
+ rpci->ops = NULL;
+ }
+}
+
+int register_rpc_pipefs(void)
+{
+ rpc_inode_cachep = kmem_cache_create("rpc_inode_cache",
+ sizeof(struct rpc_inode),
+ 0, SLAB_HWCACHE_ALIGN,
+ init_once, NULL);
+ if (!rpc_inode_cachep)
+ return -ENOMEM;
+ register_filesystem(&rpc_pipe_fs_type);
+ return 0;
+}
+
+void unregister_rpc_pipefs(void)
+{
+ if (kmem_cache_destroy(rpc_inode_cachep))
+ printk(KERN_WARNING "RPC: unable to free inode cache\n");
+ unregister_filesystem(&rpc_pipe_fs_type);
+}
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