linux-kernel - [RFC PATCH 04/11] ramfs: Add sub-filesystem data pointer to ram_fs

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Date:	Wed, 14 May 2014 16:34:52 -0500
From:	Seth Forshee <seth.forshee@...onical.com>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jens Axboe <axboe@...nel.dk>, Arnd Bergmann <arnd@...db.de>,
	Eric Biederman <ebiederm@...ssion.com>,
	Serge Hallyn <serge.hallyn@...onical.com>,
	lxc-devel@...ts.linuxcontainers.org,
	Seth Forshee <seth.forshee@...onical.com>
Subject: [RFC PATCH 04/11] ramfs: Add sub-filesystem data pointer to ram_fs_info

devtmpfs will use ramfs if tmpfs is not available, and it needs
to store some data of its own. Add a sub_fs_data pointer to
struct ram_fs_info and move the struct definition to the shared
header, and export the relevant structs to give devtmpfs access
to this pointer.

Signed-off-by: Seth Forshee <seth.forshee@...onical.com>
---
 fs/ramfs/inode.c      | 8 --------
 include/linux/ramfs.h | 9 +++++++++
 2 files changed, 9 insertions(+), 8 deletions(-)

diff --git a/fs/ramfs/inode.c b/fs/ramfs/inode.c
index d365b1c4eb3c..0f2fa4d7212c 100644
--- a/fs/ramfs/inode.c
+++ b/fs/ramfs/inode.c
@@ -163,10 +163,6 @@ static const struct super_operations ramfs_ops = {
 	.show_options	= generic_show_options,
 };
 
-struct ramfs_mount_opts {
-	umode_t mode;
-};
-
 enum {
 	Opt_mode,
 	Opt_err
@@ -177,10 +173,6 @@ static const match_table_t tokens = {
 	{Opt_err, NULL}
 };
 
-struct ramfs_fs_info {
-	struct ramfs_mount_opts mount_opts;
-};
-
 static int ramfs_parse_options(char *data, struct ramfs_mount_opts *opts)
 {
 	substring_t args[MAX_OPT_ARGS];
diff --git a/include/linux/ramfs.h b/include/linux/ramfs.h
index ecc730977a5a..cd00e86cc444 100644
--- a/include/linux/ramfs.h
+++ b/include/linux/ramfs.h
@@ -1,6 +1,15 @@
 #ifndef _LINUX_RAMFS_H
 #define _LINUX_RAMFS_H
 
+struct ramfs_mount_opts {
+	umode_t mode;
+};
+
+struct ramfs_fs_info {
+	struct ramfs_mount_opts mount_opts;
+	void *sub_fs_data;
+};
+
 struct inode *ramfs_get_inode(struct super_block *sb, const struct inode *dir,
 	 umode_t mode, dev_t dev);
 extern struct dentry *ramfs_mount(struct file_system_type *fs_type,
-- 
1.9.1

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