linux-kernel - [RFC PATCH 03/11] tmpfs: Add sub-filesystem data pointer to shmem_sb

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Date:	Wed, 14 May 2014 16:34:51 -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 03/11] tmpfs: Add sub-filesystem data pointer to shmem_sb_info

devtmpfs is built on top of tmpfs but also needs to store some
data of its own. Add a sub_fs_data pointer to
struct shmem_sb_info for this purpose.

Signed-off-by: Seth Forshee <seth.forshee@...onical.com>
---
 include/linux/shmem_fs.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/shmem_fs.h b/include/linux/shmem_fs.h
index 4d1771c2d29f..7e2c33a0c73a 100644
--- a/include/linux/shmem_fs.h
+++ b/include/linux/shmem_fs.h
@@ -33,6 +33,7 @@ struct shmem_sb_info {
 	kgid_t gid;		    /* Mount gid for root directory */
 	umode_t mode;		    /* Mount mode for root directory */
 	struct mempolicy *mpol;     /* default memory policy for mappings */
+	void *sub_fs_data;	    /* data for other shmem-based fses */
 };
 
 static inline struct shmem_inode_info *SHMEM_I(struct inode *inode)
-- 
1.9.1

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