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authorTejun Heo <tj@kernel.org>2012-04-01 12:09:56 -0700
committerTejun Heo <tj@kernel.org>2012-04-01 12:09:56 -0700
commit05ef1d7c4a5b6d09cadd2b8e9b3c395363d1a89c (patch)
treec63adfca7c1d6a6858cd0cecf6f4eb83775c35d8 /include/linux/cgroup.h
parentf6ea93723d0049ae5fbbb5292cb10c51d7a80801 (diff)
cgroup: introduce struct cfent
This patch adds cfent (cgroup file entry) which is the association between a cgroup and a file. This is in-cgroup representation of files under a cgroup directory. This simplifies walking walking cgroup files and thus cgroup_clear_directory(), which is now implemented in two parts - cgroup_rm_file() and a loop around it. cgroup_rm_file() will be used to implement cftype removal and cfent is scheduled to serve cgroup specific per-file data (e.g. for sysfs-like "sever" semantics). v2: - cfe was freed from cgroup_rm_file() which led to use-after-free if the file had openers at the time of removal. Moved to cgroup_diput(). - cgroup_clear_directory() triggered WARN_ON_ONCE() if d_subdirs wasn't empty after removing all files. This triggered spuriously if some files were open during directory clearing. Removed. v3: - In cgroup_diput(), WARN_ONCE(!list_empty(&cfe->node)) could be spuriously triggered for root cgroups because they don't go through cgroup_clear_directory() on unmount. Don't trigger WARN for root cgroups. Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Li Zefan <lizf@cn.fujitsu.com> Cc: Glauber Costa <glommer@parallels.com>
Diffstat (limited to 'include/linux/cgroup.h')
-rw-r--r--include/linux/cgroup.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index 7a3d96755114..87b034ed0c31 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -175,6 +175,7 @@ struct cgroup {
*/
struct list_head sibling; /* my parent's children */
struct list_head children; /* my children */
+ struct list_head files; /* my files */
struct cgroup *parent; /* my parent */
struct dentry __rcu *dentry; /* cgroup fs entry, RCU protected */