kernfs: introduce kernfs_pin_sb()

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commit 4e26445faa upstream.

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. ]
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Li Zefan <lizefan@huawei.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Li Zefan 2014-06-30 11:50:28 +08:00 • committed by Greg Kroah-Hartman

parent 0b2332fbef

commit f5fc1ec5e8

2 changed files with 31 additions and 0 deletions

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fs/kernfs/mount.c

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1

include/linux/kernfs.h

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