From: Kirill A. Shutemov <kirill@shutemov.name>
Date: Mon, 17 May 2010 13:55:47 +0000 (+0300)
Subject: mtd: mtdchar: Do not corrupt backing device of device node inode
X-Git-Tag: v2.6.35-rc1~465^2~11
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cd874237d97f24f601f16a140d20803b6a79202e;p=pandora-kernel.git

mtd: mtdchar: Do not corrupt backing device of device node inode

We cannot modify file->f_mapping->backing_dev_info, because it will corrupt
backing device of device node inode, since file->f_mapping is equal to
inode->i_mapping (see __dentry_open() in fs/open.c).

Let's introduce separate inode for MTD device with appropriate backing
device.

[dwmw2: Refactor to keep it all entirely within mtdchar.c; use iget_locked()]

Signed-off-by: Kirill A. Shutemov <kirill@shutemov.name>
Acked-by: Jan Kara <jack@suse.cz>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
---

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