tree 959b1197fea798c9daae4dd6c9596ab710d41fda
parent 622d42cac9ed42098aa50c53994f625abfa3d473
author Paul Menage <menage@google.com> 1202372025 -0800
committer Linus Torvalds <torvalds@woody.linux-foundation.org> 1202402538 -0800

cgroups: move cgroups destroy() callbacks to cgroup_diput()

Move the calls to the cgroup subsystem destroy() methods from
cgroup_rmdir() to cgroup_diput().  This allows control file reads and
writes to access their subsystem state without having to be concerned with
locking against cgroup destruction - the control file dentry will keep the
cgroup and its subsystem state objects alive until the file is closed.

The documentation is updated to reflect the changed semantics of destroy();
additionally the locking comments for destroy() and some other methods were
clarified and decrustified.

Signed-off-by: Paul Menage <menage@google.com>
Cc: Paul Jackson <pj@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>