Merge branch 'nfs-for-2.6.32'
[pandora-kernel.git] / net / sunrpc / rpc_pipe.c
index 9ced062..7f676bd 100644 (file)
@@ -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);
@@ -397,67 +398,13 @@ 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;