1 files changed, 401 insertions, 284 deletions

diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c
index 9ced0628d69c..7f676bdf70d3 100644
--- a/net/sunrpc/rpc_pipe.c
+++ b/net/sunrpc/rpc_pipe.c
@@ -26,6 +26,7 @@
 #include <linux/sunrpc/clnt.h>
 #include <linux/workqueue.h>
 #include <linux/sunrpc/rpc_pipe_fs.h>
+#include <linux/sunrpc/cache.h>
 
 static struct vfsmount *rpc_mount __read_mostly;
 static int rpc_mount_count;
@@ -125,7 +126,7 @@ static void
 rpc_close_pipes(struct inode *inode)
 {
         struct rpc_inode *rpci = RPC_I(inode);
-        struct rpc_pipe_ops *ops;
+        const struct rpc_pipe_ops *ops;
         int need_release;
 
         mutex_lock(&inode->i_mutex);
@@ -398,66 +399,12 @@ static const struct file_operations rpc_info_operations = {
 
 
 /*
- * We have a single directory with 1 node in it.
- */
-enum {
-        RPCAUTH_Root = 1,
-        RPCAUTH_lockd,
-        RPCAUTH_mount,
-        RPCAUTH_nfs,
-        RPCAUTH_portmap,
-        RPCAUTH_statd,
-        RPCAUTH_nfsd4_cb,
-        RPCAUTH_RootEOF
-};
-
-/*
  * Description of fs contents.
  */
 struct rpc_filelist {
-        char *name;
+        const char *name;
         const struct file_operations *i_fop;
-        int mode;
-};
-
-static struct rpc_filelist files[] = {
-        [RPCAUTH_lockd] = {
-                .name = "lockd",
-                .mode = S_IFDIR | S_IRUGO | S_IXUGO,
-        },
-        [RPCAUTH_mount] = {
-                .name = "mount",
-                .mode = S_IFDIR | S_IRUGO | S_IXUGO,
-        },
-        [RPCAUTH_nfs] = {
-                .name = "nfs",
-                .mode = S_IFDIR | S_IRUGO | S_IXUGO,
-        },
-        [RPCAUTH_portmap] = {
-                .name = "portmap",
-                .mode = S_IFDIR | S_IRUGO | S_IXUGO,
-        },
-        [RPCAUTH_statd] = {
-                .name = "statd",
-                .mode = S_IFDIR | S_IRUGO | S_IXUGO,
-        },
-        [RPCAUTH_nfsd4_cb] = {
-                .name = "nfsd4_cb",
-                .mode = S_IFDIR | S_IRUGO | S_IXUGO,
-        },
-};
-
-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,
-        },
+        umode_t mode;
 };
 
 struct vfsmount *rpc_get_mount(void)
@@ -469,11 +416,13 @@ struct vfsmount *rpc_get_mount(void)
                 return ERR_PTR(err);
         return rpc_mount;
 }
+EXPORT_SYMBOL_GPL(rpc_get_mount);
 
 void rpc_put_mount(void)
 {
         simple_release_fs(&rpc_mount, &rpc_mount_count);
 }
+EXPORT_SYMBOL_GPL(rpc_put_mount);
 
 static int rpc_delete_dentry(struct dentry *dentry)
 {
@@ -484,39 +433,8 @@ static const struct dentry_operations rpc_dentry_operations = {
         .d_delete = rpc_delete_dentry,
 };
 
-static int
-rpc_lookup_parent(char *path, struct nameidata *nd)
-{
-        struct vfsmount *mnt;
-
-        if (path[0] == '\0')
-                return -ENOENT;
-
-        mnt = rpc_get_mount();
-        if (IS_ERR(mnt)) {
-                printk(KERN_WARNING "%s: %s failed to mount "
-                               "pseudofilesystem \n", __FILE__, __func__);
-                return PTR_ERR(mnt);
-        }
-
-        if (vfs_path_lookup(mnt->mnt_root, mnt, path, LOOKUP_PARENT, nd)) {
-                printk(KERN_WARNING "%s: %s failed to find path %s\n",
-                                __FILE__, __func__, path);
-                rpc_put_mount();
-                return -ENOENT;
-        }
-        return 0;
-}
-
-static void
-rpc_release_path(struct nameidata *nd)
-{
-        path_put(&nd->path);
-        rpc_put_mount();
-}
-
 static struct inode *
-rpc_get_inode(struct super_block *sb, int mode)
+rpc_get_inode(struct super_block *sb, umode_t mode)
 {
         struct inode *inode = new_inode(sb);
         if (!inode)
@@ -534,212 +452,274 @@ rpc_get_inode(struct super_block *sb, int mode)
         return inode;
 }
 
-/*
- * FIXME: This probably has races.
- */
-static void rpc_depopulate(struct dentry *parent,
-                           unsigned long start, unsigned long eof)
+static int __rpc_create_common(struct inode *dir, struct dentry *dentry,
+                               umode_t mode,
+                               const struct file_operations *i_fop,
+                               void *private)
 {
-        struct inode *dir = parent->d_inode;
-        struct list_head *pos, *next;
-        struct dentry *dentry, *dvec[10];
-        int n = 0;
+        struct inode *inode;
 
-        mutex_lock_nested(&dir->i_mutex, I_MUTEX_CHILD);
-repeat:
-        spin_lock(&dcache_lock);
-        list_for_each_safe(pos, next, &parent->d_subdirs) {
-                dentry = list_entry(pos, struct dentry, d_u.d_child);
-                if (!dentry->d_inode ||
-                                dentry->d_inode->i_ino < start ||
-                                dentry->d_inode->i_ino >= eof)
-                        continue;
-                spin_lock(&dentry->d_lock);
-                if (!d_unhashed(dentry)) {
-                        dget_locked(dentry);
-                        __d_drop(dentry);
-                        spin_unlock(&dentry->d_lock);
-                        dvec[n++] = dentry;
-                        if (n == ARRAY_SIZE(dvec))
-                                break;
-                } else
-                        spin_unlock(&dentry->d_lock);
-        }
-        spin_unlock(&dcache_lock);
-        if (n) {
-                do {
-                        dentry = dvec[--n];
-                        if (S_ISREG(dentry->d_inode->i_mode))
-                                simple_unlink(dir, dentry);
-                        else if (S_ISDIR(dentry->d_inode->i_mode))
-                                simple_rmdir(dir, dentry);
-                        d_delete(dentry);
-                        dput(dentry);
-                } while (n);
-                goto repeat;
-        }
-        mutex_unlock(&dir->i_mutex);
+        BUG_ON(!d_unhashed(dentry));
+        inode = rpc_get_inode(dir->i_sb, mode);
+        if (!inode)
+                goto out_err;
+        inode->i_ino = iunique(dir->i_sb, 100);
+        if (i_fop)
+                inode->i_fop = i_fop;
+        if (private)
+                rpc_inode_setowner(inode, private);
+        d_add(dentry, inode);
+        return 0;
+out_err:
+        printk(KERN_WARNING "%s: %s failed to allocate inode for dentry %s\n",
+                        __FILE__, __func__, dentry->d_name.name);
+        dput(dentry);
+        return -ENOMEM;
 }
 
-static int
-rpc_populate(struct dentry *parent,
-                struct rpc_filelist *files,
-                int start, int eof)
+static int __rpc_create(struct inode *dir, struct dentry *dentry,
+                        umode_t mode,
+                        const struct file_operations *i_fop,
+                        void *private)
 {
-        struct inode *inode, *dir = parent->d_inode;
-        void *private = RPC_I(dir)->private;
-        struct dentry *dentry;
-        int mode, i;
+        int err;
 
-        mutex_lock(&dir->i_mutex);
-        for (i = start; i < eof; i++) {
-                dentry = d_alloc_name(parent, files[i].name);
-                if (!dentry)
-                        goto out_bad;
-                dentry->d_op = &rpc_dentry_operations;
-                mode = files[i].mode;
-                inode = rpc_get_inode(dir->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))
-                        inc_nlink(dir);
-                d_add(dentry, inode);
-                fsnotify_create(dir, dentry);
-        }
-        mutex_unlock(&dir->i_mutex);
+        err = __rpc_create_common(dir, dentry, S_IFREG | mode, i_fop, private);
+        if (err)
+                return err;
+        fsnotify_create(dir, dentry);
         return 0;
-out_bad:
-        mutex_unlock(&dir->i_mutex);
-        printk(KERN_WARNING "%s: %s failed to populate directory %s\n",
-                        __FILE__, __func__, parent->d_name.name);
-        return -ENOMEM;
 }
 
-static int
-__rpc_mkdir(struct inode *dir, struct dentry *dentry)
+static int __rpc_mkdir(struct inode *dir, struct dentry *dentry,
+                       umode_t mode,
+                       const struct file_operations *i_fop,
+                       void *private)
 {
-        struct inode *inode;
+        int err;
 
-        inode = rpc_get_inode(dir->i_sb, S_IFDIR | S_IRUGO | S_IXUGO);
-        if (!inode)
-                goto out_err;
-        inode->i_ino = iunique(dir->i_sb, 100);
-        d_instantiate(dentry, inode);
+        err = __rpc_create_common(dir, dentry, S_IFDIR | mode, i_fop, private);
+        if (err)
+                return err;
         inc_nlink(dir);
         fsnotify_mkdir(dir, dentry);
         return 0;
-out_err:
-        printk(KERN_WARNING "%s: %s failed to allocate inode for dentry %s\n",
-                        __FILE__, __func__, dentry->d_name.name);
-        return -ENOMEM;
 }
 
-static int
-__rpc_rmdir(struct inode *dir, struct dentry *dentry)
+static int __rpc_mkpipe(struct inode *dir, struct dentry *dentry,
+                        umode_t mode,
+                        const struct file_operations *i_fop,
+                        void *private,
+                        const struct rpc_pipe_ops *ops,
+                        int flags)
 {
-        int error;
-        error = simple_rmdir(dir, dentry);
-        if (!error)
-                d_delete(dentry);
-        return error;
+        struct rpc_inode *rpci;
+        int err;
+
+        err = __rpc_create_common(dir, dentry, S_IFIFO | mode, i_fop, private);
+        if (err)
+                return err;
+        rpci = RPC_I(dentry->d_inode);
+        rpci->nkern_readwriters = 1;
+        rpci->private = private;
+        rpci->flags = flags;
+        rpci->ops = ops;
+        fsnotify_create(dir, dentry);
+        return 0;
 }
 
-static struct dentry *
-rpc_lookup_create(struct dentry *parent, const char *name, int len, int exclusive)
+static int __rpc_rmdir(struct inode *dir, struct dentry *dentry)
+{
+        int ret;
+
+        dget(dentry);
+        ret = simple_rmdir(dir, dentry);
+        d_delete(dentry);
+        dput(dentry);
+        return ret;
+}
+
+static int __rpc_unlink(struct inode *dir, struct dentry *dentry)
+{
+        int ret;
+
+        dget(dentry);
+        ret = simple_unlink(dir, dentry);
+        d_delete(dentry);
+        dput(dentry);
+        return ret;
+}
+
+static int __rpc_rmpipe(struct inode *dir, struct dentry *dentry)
+{
+        struct inode *inode = dentry->d_inode;
+        struct rpc_inode *rpci = RPC_I(inode);
+
+        rpci->nkern_readwriters--;
+        if (rpci->nkern_readwriters != 0)
+                return 0;
+        rpc_close_pipes(inode);
+        return __rpc_unlink(dir, dentry);
+}
+
+static struct dentry *__rpc_lookup_create(struct dentry *parent,
+                                          struct qstr *name)
 {
-        struct inode *dir = parent->d_inode;
         struct dentry *dentry;
 
-        mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
-        dentry = lookup_one_len(name, parent, len);
-        if (IS_ERR(dentry))
-                goto out_err;
+        dentry = d_lookup(parent, name);
+        if (!dentry) {
+                dentry = d_alloc(parent, name);
+                if (!dentry) {
+                        dentry = ERR_PTR(-ENOMEM);
+                        goto out_err;
+                }
+        }
         if (!dentry->d_inode)
                 dentry->d_op = &rpc_dentry_operations;
-        else if (exclusive) {
-                dput(dentry);
-                dentry = ERR_PTR(-EEXIST);
-                goto out_err;
-        }
-        return dentry;
 out_err:
-        mutex_unlock(&dir->i_mutex);
         return dentry;
 }
 
-static struct dentry *
-rpc_lookup_negative(char *path, struct nameidata *nd)
+static struct dentry *__rpc_lookup_create_exclusive(struct dentry *parent,
+                                          struct qstr *name)
 {
         struct dentry *dentry;
-        int error;
 
-        if ((error = rpc_lookup_parent(path, nd)) != 0)
-                return ERR_PTR(error);
-        dentry = rpc_lookup_create(nd->path.dentry, nd->last.name, nd->last.len,
-                                   1);
-        if (IS_ERR(dentry))
-                rpc_release_path(nd);
-        return dentry;
+        dentry = __rpc_lookup_create(parent, name);
+        if (dentry->d_inode == NULL)
+                return dentry;
+        dput(dentry);
+        return ERR_PTR(-EEXIST);
 }
 
-/**
- * rpc_mkdir - Create a new directory in rpc_pipefs
- * @path: path from the rpc_pipefs root to the new directory
- * @rpc_client: rpc client to associate with this directory
- *
- * This creates a directory at the given @path associated with
- * @rpc_clnt, which will contain a file named "info" with some basic
- * information about the client, together with any "pipes" that may
- * later be created using rpc_mkpipe().
+/*
+ * FIXME: This probably has races.
  */
-struct dentry *
-rpc_mkdir(char *path, struct rpc_clnt *rpc_client)
+static void __rpc_depopulate(struct dentry *parent,
+                             const struct rpc_filelist *files,
+                             int start, int eof)
 {
-        struct nameidata nd;
+        struct inode *dir = parent->d_inode;
         struct dentry *dentry;
-        struct inode *dir;
+        struct qstr name;
+        int i;
+
+        for (i = start; i < eof; i++) {
+                name.name = files[i].name;
+                name.len = strlen(files[i].name);
+                name.hash = full_name_hash(name.name, name.len);
+                dentry = d_lookup(parent, &name);
+
+                if (dentry == NULL)
+                        continue;
+                if (dentry->d_inode == NULL)
+                        goto next;
+                switch (dentry->d_inode->i_mode & S_IFMT) {
+                        default:
+                                BUG();
+                        case S_IFREG:
+                                __rpc_unlink(dir, dentry);
+                                break;
+                        case S_IFDIR:
+                                __rpc_rmdir(dir, dentry);
+                }
+next:
+                dput(dentry);
+        }
+}
+
+static void rpc_depopulate(struct dentry *parent,
+                           const struct rpc_filelist *files,
+                           int start, int eof)
+{
+        struct inode *dir = parent->d_inode;
+
+        mutex_lock_nested(&dir->i_mutex, I_MUTEX_CHILD);
+        __rpc_depopulate(parent, files, start, eof);
+        mutex_unlock(&dir->i_mutex);
+}
+
+static int rpc_populate(struct dentry *parent,
+                        const struct rpc_filelist *files,
+                        int start, int eof,
+                        void *private)
+{
+        struct inode *dir = parent->d_inode;
+        struct dentry *dentry;
+        int i, err;
+
+        mutex_lock(&dir->i_mutex);
+        for (i = start; i < eof; i++) {
+                struct qstr q;
+
+                q.name = files[i].name;
+                q.len = strlen(files[i].name);
+                q.hash = full_name_hash(q.name, q.len);
+                dentry = __rpc_lookup_create_exclusive(parent, &q);
+                err = PTR_ERR(dentry);
+                if (IS_ERR(dentry))
+                        goto out_bad;
+                switch (files[i].mode & S_IFMT) {
+                        default:
+                                BUG();
+                        case S_IFREG:
+                                err = __rpc_create(dir, dentry,
+                                                files[i].mode,
+                                                files[i].i_fop,
+                                                private);
+                                break;
+                        case S_IFDIR:
+                                err = __rpc_mkdir(dir, dentry,
+                                                files[i].mode,
+                                                NULL,
+                                                private);
+                }
+                if (err != 0)
+                        goto out_bad;
+        }
+        mutex_unlock(&dir->i_mutex);
+        return 0;
+out_bad:
+        __rpc_depopulate(parent, files, start, eof);
+        mutex_unlock(&dir->i_mutex);
+        printk(KERN_WARNING "%s: %s failed to populate directory %s\n",
+                        __FILE__, __func__, parent->d_name.name);
+        return err;
+}
+
+static struct dentry *rpc_mkdir_populate(struct dentry *parent,
+                struct qstr *name, umode_t mode, void *private,
+                int (*populate)(struct dentry *, void *), void *args_populate)
+{
+        struct dentry *dentry;
+        struct inode *dir = parent->d_inode;
         int error;
 
-        dentry = rpc_lookup_negative(path, &nd);
+        mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
+        dentry = __rpc_lookup_create_exclusive(parent, name);
         if (IS_ERR(dentry))
-                return dentry;
-        dir = nd.path.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;
-        dget(dentry);
+                goto out;
+        error = __rpc_mkdir(dir, dentry, mode, NULL, private);
+        if (error != 0)
+                goto out_err;
+        if (populate != NULL) {
+                error = populate(dentry, args_populate);
+                if (error)
+                        goto err_rmdir;
+        }
 out:
         mutex_unlock(&dir->i_mutex);
-        rpc_release_path(&nd);
         return dentry;
-err_depopulate:
-        rpc_depopulate(dentry, RPCAUTH_info, RPCAUTH_EOF);
+err_rmdir:
         __rpc_rmdir(dir, dentry);
-err_dput:
-        dput(dentry);
-        printk(KERN_WARNING "%s: %s() failed to create directory %s (errno = %d)\n",
-                        __FILE__, __func__, path, error);
+out_err:
         dentry = ERR_PTR(error);
         goto out;
 }
 
-/**
- * rpc_rmdir - Remove a directory created with rpc_mkdir()
- * @dentry: directory to remove
- */
-int
-rpc_rmdir(struct dentry *dentry)
+static int rpc_rmdir_depopulate(struct dentry *dentry,
+                void (*depopulate)(struct dentry *))
 {
         struct dentry *parent;
         struct inode *dir;
@@ -748,9 +728,9 @@ rpc_rmdir(struct dentry *dentry)
         parent = dget_parent(dentry);
         dir = parent->d_inode;
         mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
-        rpc_depopulate(dentry, RPCAUTH_info, RPCAUTH_EOF);
+        if (depopulate != NULL)
+                depopulate(dentry);
         error = __rpc_rmdir(dir, dentry);
-        dput(dentry);
         mutex_unlock(&dir->i_mutex);
         dput(parent);
         return error;
@@ -776,50 +756,54 @@ rpc_rmdir(struct dentry *dentry)
  * The @private argument passed here will be available to all these methods
  * from the file pointer, via RPC_I(file->f_dentry->d_inode)->private.
  */
-struct dentry *
-rpc_mkpipe(struct dentry *parent, const char *name, void *private, struct rpc_pipe_ops *ops, int flags)
+struct dentry *rpc_mkpipe(struct dentry *parent, const char *name,
+                          void *private, const struct rpc_pipe_ops *ops,
+                          int flags)
 {
         struct dentry *dentry;
-        struct inode *dir, *inode;
-        struct rpc_inode *rpci;
+        struct inode *dir = parent->d_inode;
+        umode_t umode = S_IFIFO | S_IRUSR | S_IWUSR;
+        struct qstr q;
+        int err;
+
+        if (ops->upcall == NULL)
+                umode &= ~S_IRUGO;
+        if (ops->downcall == NULL)
+                umode &= ~S_IWUGO;
+
+        q.name = name;
+        q.len = strlen(name);
+        q.hash = full_name_hash(q.name, q.len),
 
-        dentry = rpc_lookup_create(parent, name, strlen(name), 0);
+        mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
+        dentry = __rpc_lookup_create(parent, &q);
         if (IS_ERR(dentry))
-                return dentry;
-        dir = parent->d_inode;
+                goto out;
         if (dentry->d_inode) {
-                rpci = RPC_I(dentry->d_inode);
+                struct rpc_inode *rpci = RPC_I(dentry->d_inode);
                 if (rpci->private != private ||
                                 rpci->ops != ops ||
                                 rpci->flags != flags) {
                         dput (dentry);
-                        dentry = ERR_PTR(-EBUSY);
+                        err = -EBUSY;
+                        goto out_err;
                 }
                 rpci->nkern_readwriters++;
                 goto out;
         }
-        inode = rpc_get_inode(dir->i_sb, S_IFIFO | S_IRUSR | S_IWUSR);
-        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->flags = flags;
-        rpci->ops = ops;
-        rpci->nkern_readwriters = 1;
-        fsnotify_create(dir, dentry);
-        dget(dentry);
+
+        err = __rpc_mkpipe(dir, dentry, umode, &rpc_pipe_fops,
+                           private, ops, flags);
+        if (err)
+                goto out_err;
 out:
         mutex_unlock(&dir->i_mutex);
         return dentry;
-err_dput:
-        dput(dentry);
-        dentry = ERR_PTR(-ENOMEM);
+out_err:
+        dentry = ERR_PTR(err);
         printk(KERN_WARNING "%s: %s() failed to create pipe %s/%s (errno = %d)\n",
                         __FILE__, __func__, parent->d_name.name, name,
-                        -ENOMEM);
+                        err);
         goto out;
 }
 EXPORT_SYMBOL_GPL(rpc_mkpipe);
@@ -842,19 +826,107 @@ rpc_unlink(struct dentry *dentry)
         parent = dget_parent(dentry);
         dir = parent->d_inode;
         mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
-        if (--RPC_I(dentry->d_inode)->nkern_readwriters == 0) {
-                rpc_close_pipes(dentry->d_inode);
-                error = simple_unlink(dir, dentry);
-                if (!error)
-                        d_delete(dentry);
-        }
-        dput(dentry);
+        error = __rpc_rmpipe(dir, dentry);
         mutex_unlock(&dir->i_mutex);
         dput(parent);
         return error;
 }
 EXPORT_SYMBOL_GPL(rpc_unlink);
 
+enum {
+        RPCAUTH_info,
+        RPCAUTH_EOF
+};
+
+static const struct rpc_filelist authfiles[] = {
+        [RPCAUTH_info] = {
+                .name = "info",
+                .i_fop = &rpc_info_operations,
+                .mode = S_IFREG | S_IRUSR,
+        },
+};
+
+static int rpc_clntdir_populate(struct dentry *dentry, void *private)
+{
+        return rpc_populate(dentry,
+                            authfiles, RPCAUTH_info, RPCAUTH_EOF,
+                            private);
+}
+
+static void rpc_clntdir_depopulate(struct dentry *dentry)
+{
+        rpc_depopulate(dentry, authfiles, RPCAUTH_info, RPCAUTH_EOF);
+}
+
+/**
+ * rpc_create_client_dir - Create a new rpc_client directory in rpc_pipefs
+ * @path: path from the rpc_pipefs root to the new directory
+ * @rpc_client: rpc client to associate with this directory
+ *
+ * This creates a directory at the given @path associated with
+ * @rpc_clnt, which will contain a file named "info" with some basic
+ * information about the client, together with any "pipes" that may
+ * later be created using rpc_mkpipe().
+ */
+struct dentry *rpc_create_client_dir(struct dentry *dentry,
+                                   struct qstr *name,
+                                   struct rpc_clnt *rpc_client)
+{
+        return rpc_mkdir_populate(dentry, name, S_IRUGO | S_IXUGO, NULL,
+                        rpc_clntdir_populate, rpc_client);
+}
+
+/**
+ * rpc_remove_client_dir - Remove a directory created with rpc_create_client_dir()
+ * @dentry: directory to remove
+ */
+int rpc_remove_client_dir(struct dentry *dentry)
+{
+        return rpc_rmdir_depopulate(dentry, rpc_clntdir_depopulate);
+}
+
+static const struct rpc_filelist cache_pipefs_files[3] = {
+        [0] = {
+                .name = "channel",
+                .i_fop = &cache_file_operations_pipefs,
+                .mode = S_IFREG|S_IRUSR|S_IWUSR,
+        },
+        [1] = {
+                .name = "content",
+                .i_fop = &content_file_operations_pipefs,
+                .mode = S_IFREG|S_IRUSR,
+        },
+        [2] = {
+                .name = "flush",
+                .i_fop = &cache_flush_operations_pipefs,
+                .mode = S_IFREG|S_IRUSR|S_IWUSR,
+        },
+};
+
+static int rpc_cachedir_populate(struct dentry *dentry, void *private)
+{
+        return rpc_populate(dentry,
+                            cache_pipefs_files, 0, 3,
+                            private);
+}
+
+static void rpc_cachedir_depopulate(struct dentry *dentry)
+{
+        rpc_depopulate(dentry, cache_pipefs_files, 0, 3);
+}
+
+struct dentry *rpc_create_cache_dir(struct dentry *parent, struct qstr *name,
+                                    mode_t umode, struct cache_detail *cd)
+{
+        return rpc_mkdir_populate(parent, name, umode, NULL,
+                        rpc_cachedir_populate, cd);
+}
+
+void rpc_remove_cache_dir(struct dentry *dentry)
+{
+        rpc_rmdir_depopulate(dentry, rpc_cachedir_depopulate);
+}
+
 /*
  * populate the filesystem
  */
@@ -866,6 +938,51 @@ static struct super_operations s_ops = {
 
 #define RPCAUTH_GSSMAGIC 0x67596969
 
+/*
+ * We have a single directory with 1 node in it.
+ */
+enum {
+        RPCAUTH_lockd,
+        RPCAUTH_mount,
+        RPCAUTH_nfs,
+        RPCAUTH_portmap,
+        RPCAUTH_statd,
+        RPCAUTH_nfsd4_cb,
+        RPCAUTH_cache,
+        RPCAUTH_RootEOF
+};
+
+static const struct rpc_filelist files[] = {
+        [RPCAUTH_lockd] = {
+                .name = "lockd",
+                .mode = S_IFDIR | S_IRUGO | S_IXUGO,
+        },
+        [RPCAUTH_mount] = {
+                .name = "mount",
+                .mode = S_IFDIR | S_IRUGO | S_IXUGO,
+        },
+        [RPCAUTH_nfs] = {
+                .name = "nfs",
+                .mode = S_IFDIR | S_IRUGO | S_IXUGO,
+        },
+        [RPCAUTH_portmap] = {
+                .name = "portmap",
+                .mode = S_IFDIR | S_IRUGO | S_IXUGO,
+        },
+        [RPCAUTH_statd] = {
+                .name = "statd",
+                .mode = S_IFDIR | S_IRUGO | S_IXUGO,
+        },
+        [RPCAUTH_nfsd4_cb] = {
+                .name = "nfsd4_cb",
+                .mode = S_IFDIR | S_IRUGO | S_IXUGO,
+        },
+        [RPCAUTH_cache] = {
+                .name = "cache",
+                .mode = S_IFDIR | S_IRUGO | S_IXUGO,
+        },
+};
+
 static int
 rpc_fill_super(struct super_block *sb, void *data, int silent)
 {
@@ -886,7 +1003,7 @@ rpc_fill_super(struct super_block *sb, void *data, int silent)
                 iput(inode);
                 return -ENOMEM;
         }
-        if (rpc_populate(root, files, RPCAUTH_Root + 1, RPCAUTH_RootEOF))
+        if (rpc_populate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF, NULL))
                 goto out;
         sb->s_root = root;
         return 0;