Add subsystem APIs css_mount and css_umount which will be called during
cgroup_mount and umount respectively. This will let the subsystem
perform any specific setup during mount/umount.
This will be used in code data prioritization code later.
Signed-off-by: Vikas Shivappa <vikas.shiva...@linux.intel.com>
---
include/linux/cgroup.h | 2 ++
kernel/cgroup.c | 12 ++++++++++++
2 files changed, 14 insertions(+)
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index 292ed97..3ded186 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -655,6 +655,8 @@ struct cgroup_subsys {
struct cgroup_subsys_state *old_css,
struct task_struct *task);
void (*bind)(struct cgroup_subsys_state *root_css);
+ void (*css_mount)(void *mount_info);
+ void (*css_umount)(void);
int disabled;
int early_init;
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 668f614..e139504 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -1345,6 +1345,7 @@ struct cgroup_sb_opts {
char *name;
/* User explicitly requested empty subsystem */
bool none;
+ void *mount_info;
};
static int parse_cgroupfs_options(char *data, struct cgroup_sb_opts *opts)
@@ -1787,6 +1788,11 @@ static struct dentry *cgroup_mount(struct
file_system_type *fs_type,
if (ret)
goto out_unlock;
+ for_each_subsys(ss, i) {
+ if ((opts.subsys_mask && (1U << i)) && ss->css_mount)
+ ss->css_mount(opts.mount_info);
+ }
+
/* look for a matching existing root */
if (opts.flags & CGRP_ROOT_SANE_BEHAVIOR) {
cgrp_dfl_root_visible = true;
@@ -1928,7 +1934,13 @@ static void cgroup_kill_sb(struct super_block *sb)
{
struct kernfs_root *kf_root = kernfs_root_from_sb(sb);
struct cgroup_root *root = cgroup_root_from_kf(kf_root);
+ struct cgroup_subsys *ss;
+ int i;
+ for_each_subsys(ss, i) {
+ if ((root->subsys_mask && (1U << i)) && ss->css_umount)
+ ss->css_umount();
+ }
/*
* If @root doesn't have any mounts or children, start killing it.
* This prevents new mounts by disabling percpu_ref_tryget_live().
--
1.9.1
--
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