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Subject[PATCHSET cgroup/for-3.8] cgroup: allow ->post_create() to fail
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Hello,

This became a rather large patchset mostly because there are a lot of
weirdities and subtle breakages in create/destroy/load/unload paths.
The goal of the patchset is allowing ->post_create() to fail and
renaming ->create/post_create/pre_destroy/destroy() to
->css_alloc/css_online/css_offline/css_free().

This patchset contains the following seventeen patches.

0001-cgroup-remove-incorrect-dget-dput-pair-in-cgroup_cre.patch
0002-cgroup-initialize-cgrp-allcg_node-in-init_cgroup_hou.patch
0003-cgroup-open-code-cgroup_create_dir.patch
0004-cgroup-create-directory-before-linking-while-creatin.patch
0005-cgroup-cgroup-dentry-isn-t-a-RCU-pointer.patch
0006-cgroup-remove-duplicate-RCU-free-on-struct-cgroup.patch
0007-cgroup-make-CSS_-flags-bit-masks-instead-of-bit-posi.patch
0008-cgroup-trivial-cleanup-for-cgroup_init-load_subsys.patch
0009-cgroup-lock-cgroup_mutex-in-cgroup_init_subsys.patch
0010-cgroup-fix-harmless-bugs-in-cgroup_load_subsys-fail-.patch
0011-cgroup-separate-out-cgroup_destroy_locked.patch
0012-cgroup-introduce-CSS_ONLINE-flag-and-on-offline_css-.patch
0013-cgroup-simplify-cgroup_load_subsys-failure-path.patch
0014-cgroup-use-mutex_trylock-when-grabbing-i_mutex-of-a-.patch
0015-cgroup-update-cgroup_create-failure-path.patch
0016-cgroup-allow-post_create-to-fail.patch
0017-cgroup-rename-create-post_create-pre_destroy-destroy.patch

0001 is a bugfix. Tagged for -stable. I don't I'll push it through
for-3.7-fixes tho. This has been broken forever and nobody reported
anything yet.

0002-0011 are various fixes and cleanups to prepare for the following
changes. Each should be self-explanatory.

0012-0015 are preparation patches more directly related to allowing
failure of ->post_create().

0016 allows ->post_create() to fail.

0017 renames ops and updates documentation.

This patchst is on top of cgroup/for-3.8 and available on the
following git branch.

git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git review-cgroup-online-may-fail

and contains the following changes.

Documentation/cgroups/cgroups.txt | 49 +++---
block/blk-cgroup.c | 14 -
include/linux/cgroup.h | 47 +++---
kernel/cgroup.c | 288 +++++++++++++++++++++-----------------
kernel/cgroup_freezer.c | 22 +-
kernel/cpuset.c | 10 -
kernel/events/core.c | 8 -
kernel/sched/core.c | 16 +-
mm/hugetlb_cgroup.c | 14 -
mm/memcontrol.c | 12 -
net/core/netprio_cgroup.c | 8 -
net/sched/cls_cgroup.c | 8 -
security/device_cgroup.c | 8 -
13 files changed, 278 insertions(+), 226 deletions(-)

Thanks.

--
tejun


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