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| author |   Tejun Heo <tj@kernel.org> | 2014-02-12 09:29:50 -0500 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2014-02-12 09:29:50 -0500 |
| commit | e61734c55c24cdf11b07e52a74aec4dc4a7f4bd0 (patch) | |
| tree | bab256faae539cd38840bfc886317f80385acae4 /fs/kernfs | |
| parent | cgroup: make cgroup hold onto its kernfs_node (diff) | |
| download | linux-dev-e61734c55c24cdf11b07e52a74aec4dc4a7f4bd0.tar.xz linux-dev-e61734c55c24cdf11b07e52a74aec4dc4a7f4bd0.zip | |
cgroup: remove cgroup->name
cgroup->name handling became quite complicated over time involving
dedicated struct cgroup_name for RCU protection. Now that cgroup is
on kernfs, we can drop all of it and simply use kernfs_name/path() and
friends. Replace cgroup->name and all related code with kernfs
name/path constructs.
* Reimplement cgroup_name() and cgroup_path() as thin wrappers on top
of kernfs counterparts, which involves semantic changes.
pr_cont_cgroup_name() and pr_cont_cgroup_path() added.
* cgroup->name handling dropped from cgroup_rename().
* All users of cgroup_name/path() updated to the new semantics. Users
which were formatting the string just to printk them are converted
to use pr_cont_cgroup_name/path() instead, which simplifies things
quite a bit. As cgroup_name() no longer requires RCU read lock
around it, RCU lockings which were protecting only cgroup_name() are
removed.
v2: Comment above oom_info_lock updated as suggested by Michal.
v3: dummy_top doesn't have a kn associated and
pr_cont_cgroup_name/path() ended up calling the matching kernfs
functions with NULL kn leading to oops. Test for NULL kn and
print "/" if so. This issue was reported by Fengguang Wu.
v4: Rebased on top of 0ab02ca8f887 ("cgroup: protect modifications to
cgroup_idr with cgroup_mutex").
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Acked-by: Michal Hocko <mhocko@suse.cz>
Acked-by: Li Zefan <lizefan@huawei.com>
Cc: Fengguang Wu <fengguang.wu@intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Balbir Singh <bsingharora@gmail.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Diffstat (limited to 'fs/kernfs')
| -rw-r--r-- | fs/kernfs/dir.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/kernfs/dir.c b/fs/kernfs/dir.c index a347792c2e5a..939684ebff1e 100644 --- a/fs/kernfs/dir.c +++ b/fs/kernfs/dir.c @@ -112,6 +112,7 @@ char *kernfs_path(struct kernfs_node *kn, char *buf, size_t buflen) spin_unlock_irqrestore(&kernfs_rename_lock, flags); return p; } +EXPORT_SYMBOL_GPL(kernfs_path); /** * pr_cont_kernfs_name - pr_cont name of a kernfs_node |