kernfs: introduce kernfs_pin_sb()
authorLi Zefan <lizefan@huawei.com>
Mon, 30 Jun 2014 03:50:28 +0000 (11:50 +0800)
committerTejun Heo <tj@kernel.org>
Mon, 30 Jun 2014 14:16:25 +0000 (10:16 -0400)
commit4e26445faad366d67d7723622bf6a60a6f0f5993
treec3e0f68527e2b094af5792e31e6ec0396d784308
parent970317aa48c6ef66cd023c039c2650c897bad927
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>
fs/kernfs/mount.c
include/linux/kernfs.h