From: Li Zefan <lizefan@huawei.com>
Date: Mon, 30 Jun 2014 03:50:28 +0000 (+0800)
Subject: kernfs: introduce kernfs_pin_sb()
X-Git-Tag: omap-for-v3.17/fixes-against-rc2~319^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4e26445faad366d67d7723622bf6a60a6f0f5993;p=pandora-kernel.git

kernfs: introduce kernfs_pin_sb()

kernfs_pin_sb() tries to get a refcnt of the superblock.

This will be used by cgroupfs.

v2:
- make kernfs_pin_sb() return the superblock.
- drop kernfs_drop_sb().

tj: Updated the comment a bit.

[ This is a prerequisite for a bugfix. ]
Cc: <stable@vger.kernel.org> # 3.15
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Li Zefan <lizefan@huawei.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
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