On Tue, Aug 09, 2016 at 10:18:19AM +0200, Greg KH wrote:

On Tue, Aug 09, 2016 at 01:23:20AM -0400, Tejun Heo wrote:

quoted

kernfs path formatting functions always return the length of full path
but the content of the output buffer is undefined when the length is
longer than the provided buffer.  Most cgroup path formatting
functions return the start of the output or NULL on errors including
overflow.  These inconsistent and rather peculiar behaviors developed
over time and make these functions unnecessarily difficult to use.
This patchset updates the formatting functions so that they all behave
in the style of strlcpy().

Greg, these changes are used by cgroup tracepoint additions and
shouldn't affect other users much.  Would it be okay to route these
through the cgroup tree?

 0001-kernfs-add-dummy-implementation-of-kernfs_path_from_.patch
 0002-kernfs-make-kernfs_path-behave-in-the-style-of-strlc.patch
 0003-kernfs-remove-kernfs_path_len.patch
 0004-cgroup-make-cgroup_path-and-friends-behave-in-the-st.patch

The patches are also available in the following git branch.

 git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git review-kernfs_path-strlcpy

diffstat follows.  Thanks.

It's fine with me if you take these yourself:

Acked-by: Greg Kroah-Hartman <redacted>

Applied 1-4 to cgroup/for-4.9.

Thanks.

-- 
tejun