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cgroup: rename cgroup->dummy_css to ->self and move it to the top

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cgroup->dummy_css is used as the placeholder css when performing css
oriended operations on the cgroup.  We're gonna shift more cgroup
management to this css.  Let's rename it to ->self and move it to the
top.

This is pure rename and field relocation.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>
This commit is contained in:
Tejun Heo 2014-05-14 09:15:00 -04:00
parent a015edd26e
commit 9d800df12d
2 changed files with 13 additions and 13 deletions
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6
include/linux/cgroup.h
View File

@ -143,6 +143,9 @@ enum {
};
struct cgroup {
/* self css with NULL ->ss, points back to this cgroup */
struct cgroup_subsys_state self;
unsigned long flags; /* "unsigned long" so bitops work */
/*
@ -224,9 +227,6 @@ struct cgroup {
struct list_head pidlists;
struct mutex pidlist_mutex;
/* dummy css with NULL ->ss, points back to this cgroup */
struct cgroup_subsys_state dummy_css;
/* For css percpu_ref killing and RCU-protected deletion */
struct rcu_head rcu_head;
struct work_struct destroy_work;

20
kernel/cgroup.c
View File

@ -220,7 +220,7 @@ static void cgroup_idr_remove(struct idr *idr, int id)
/**
* cgroup_css - obtain a cgroup's css for the specified subsystem
* @cgrp: the cgroup of interest
* @ss: the subsystem of interest (%NULL returns the dummy_css)
* @ss: the subsystem of interest (%NULL returns @cgrp->self)
*
* Return @cgrp's css (cgroup_subsys_state) associated with @ss. This
* function must be called either under cgroup_mutex or rcu_read_lock() and
@ -235,13 +235,13 @@ static struct cgroup_subsys_state *cgroup_css(struct cgroup *cgrp,
return rcu_dereference_check(cgrp->subsys[ss->id],
lockdep_is_held(&cgroup_mutex));
else
return &cgrp->dummy_css;
return &cgrp->self;
}
/**
* cgroup_e_css - obtain a cgroup's effective css for the specified subsystem
* @cgrp: the cgroup of interest
* @ss: the subsystem of interest (%NULL returns the dummy_css)
* @ss: the subsystem of interest (%NULL returns @cgrp->self)
*
* Similar to cgroup_css() but returns the effctive css, which is defined
* as the matching css of the nearest ancestor including self which has @ss
@ -254,7 +254,7 @@ static struct cgroup_subsys_state *cgroup_e_css(struct cgroup *cgrp,
lockdep_assert_held(&cgroup_mutex);
if (!ss)
return &cgrp->dummy_css;
return &cgrp->self;
if (!(cgrp->root->subsys_mask & (1 << ss->id)))
return NULL;
@ -288,7 +288,7 @@ struct cgroup_subsys_state *of_css(struct kernfs_open_file *of)
if (cft->ss)
return rcu_dereference_raw(cgrp->subsys[cft->ss->id]);
else
return &cgrp->dummy_css;
return &cgrp->self;
}
EXPORT_SYMBOL_GPL(of_css);
@ -1551,7 +1551,7 @@ static void init_cgroup_housekeeping(struct cgroup *cgrp)
INIT_LIST_HEAD(&cgrp->release_list);
INIT_LIST_HEAD(&cgrp->pidlists);
mutex_init(&cgrp->pidlist_mutex);
cgrp->dummy_css.cgroup = cgrp;
cgrp->self.cgroup = cgrp;
for_each_subsys(ss, ssid)
INIT_LIST_HEAD(&cgrp->e_csets[ssid]);
@ -3454,7 +3454,7 @@ int cgroup_transfer_tasks(struct cgroup *to, struct cgroup *from)
* ->can_attach() fails.
*/
do {
css_task_iter_start(&from->dummy_css, &it);
css_task_iter_start(&from->self, &it);
task = css_task_iter_next(&it);
if (task)
get_task_struct(task);
@ -3719,7 +3719,7 @@ static int pidlist_array_load(struct cgroup *cgrp, enum cgroup_filetype type,
if (!array)
return -ENOMEM;
/* now, populate the array */
css_task_iter_start(&cgrp->dummy_css, &it);
css_task_iter_start(&cgrp->self, &it);
while ((tsk = css_task_iter_next(&it))) {
if (unlikely(n == length))
break;
@ -3793,7 +3793,7 @@ int cgroupstats_build(struct cgroupstats *stats, struct dentry *dentry)
}
rcu_read_unlock();
css_task_iter_start(&cgrp->dummy_css, &it);
css_task_iter_start(&cgrp->self, &it);
while ((tsk = css_task_iter_next(&it))) {
switch (tsk->state) {
case TASK_RUNNING:
@ -4274,7 +4274,7 @@ static int cgroup_mkdir(struct kernfs_node *parent_kn, const char *name,
init_cgroup_housekeeping(cgrp);
cgrp->parent = parent;
cgrp->dummy_css.parent = &parent->dummy_css;
cgrp->self.parent = &parent->self;
cgrp->root = root;
if (notify_on_release(parent))