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cgroup: split cgroup_base_files[] into cgroup_{dfl|legacy}_base_files[]

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Currently cgroup_base_files[] contains the cgroup core interface files
for both legacy and default hierarchies with each file tagged with
CFTYPE_INSANE and CFTYPE_ONLY_ON_DFL.  This is difficult to read.

Let's separate it out to two separate tables, cgroup_dfl_base_files[]
and cgroup_legacy_base_files[], and use the appropriate one in
cgroup_mkdir() depending on the hierarchy type.  This makes tagging
each file unnecessary.

This patch doesn't introduce any behavior changes.

v2: cgroup_dfl_base_files[] was missing the termination entry
    triggering WARN in cgroup_init_cftypes() for 0day kernel testing
    robot.  Fixed.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>
Cc: Jet Chen <jet.chen@intel.com>
This commit is contained in:
Tejun Heo 2014-07-15 11:05:09 -04:00
parent afd1a8b3e0
commit a14c6874be
1 changed files with 57 additions and 37 deletions
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94
kernel/cgroup.c
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@ -180,7 +180,8 @@ static u64 css_serial_nr_next = 1;
*/
static int need_forkexit_callback __read_mostly;
static struct cftype cgroup_base_files[];
static struct cftype cgroup_dfl_base_files[];
static struct cftype cgroup_legacy_base_files[];
static void cgroup_put(struct cgroup *cgrp);
static int rebind_subsystems(struct cgroup_root *dst_root,
@ -1614,6 +1615,7 @@ static int cgroup_setup_root(struct cgroup_root *root, unsigned int ss_mask)
{
LIST_HEAD(tmp_links);
struct cgroup *root_cgrp = &root->cgrp;
struct cftype *base_files;
struct css_set *cset;
int i, ret;
@ -1651,7 +1653,12 @@ static int cgroup_setup_root(struct cgroup_root *root, unsigned int ss_mask)
}
root_cgrp->kn = root->kf_root->kn;
ret = cgroup_addrm_files(root_cgrp, cgroup_base_files, true);
if (root == &cgrp_dfl_root)
base_files = cgroup_dfl_base_files;
else
base_files = cgroup_legacy_base_files;
ret = cgroup_addrm_files(root_cgrp, base_files, true);
if (ret)
goto destroy_root;
@ -4095,7 +4102,43 @@ static int cgroup_clone_children_write(struct cgroup_subsys_state *css,
return 0;
}
static struct cftype cgroup_base_files[] = {
/* cgroup core interface files for the default hierarchy */
static struct cftype cgroup_dfl_base_files[] = {
{
.name = "cgroup.procs",
.seq_start = cgroup_pidlist_start,
.seq_next = cgroup_pidlist_next,
.seq_stop = cgroup_pidlist_stop,
.seq_show = cgroup_pidlist_show,
.private = CGROUP_FILE_PROCS,
.write = cgroup_procs_write,
.mode = S_IRUGO | S_IWUSR,
},
{
.name = "cgroup.controllers",
.flags = CFTYPE_ONLY_ON_ROOT,
.seq_show = cgroup_root_controllers_show,
},
{
.name = "cgroup.controllers",
.flags = CFTYPE_NOT_ON_ROOT,
.seq_show = cgroup_controllers_show,
},
{
.name = "cgroup.subtree_control",
.seq_show = cgroup_subtree_control_show,
.write = cgroup_subtree_control_write,
},
{
.name = "cgroup.populated",
.flags = CFTYPE_NOT_ON_ROOT,
.seq_show = cgroup_populated_show,
},
{ } /* terminate */
};
/* cgroup core interface files for the legacy hierarchies */
static struct cftype cgroup_legacy_base_files[] = {
{
.name = "cgroup.procs",
.seq_start = cgroup_pidlist_start,
@ -4108,45 +4151,16 @@ static struct cftype cgroup_base_files[] = {
},
{
.name = "cgroup.clone_children",
.flags = CFTYPE_INSANE,
.read_u64 = cgroup_clone_children_read,
.write_u64 = cgroup_clone_children_write,
},
{
.name = "cgroup.sane_behavior",
.flags = CFTYPE_INSANE | CFTYPE_ONLY_ON_ROOT,
.flags = CFTYPE_ONLY_ON_ROOT,
.seq_show = cgroup_sane_behavior_show,
},
{
.name = "cgroup.controllers",
.flags = CFTYPE_ONLY_ON_DFL | CFTYPE_ONLY_ON_ROOT,
.seq_show = cgroup_root_controllers_show,
},
{
.name = "cgroup.controllers",
.flags = CFTYPE_ONLY_ON_DFL | CFTYPE_NOT_ON_ROOT,
.seq_show = cgroup_controllers_show,
},
{
.name = "cgroup.subtree_control",
.flags = CFTYPE_ONLY_ON_DFL,
.seq_show = cgroup_subtree_control_show,
.write = cgroup_subtree_control_write,
},
{
.name = "cgroup.populated",
.flags = CFTYPE_ONLY_ON_DFL | CFTYPE_NOT_ON_ROOT,
.seq_show = cgroup_populated_show,
},
/*
* Historical crazy stuff. These don't have "cgroup." prefix and
* don't exist if sane_behavior. If you're depending on these, be
* prepared to be burned.
*/
{
.name = "tasks",
.flags = CFTYPE_INSANE, /* use "procs" instead */
.seq_start = cgroup_pidlist_start,
.seq_next = cgroup_pidlist_next,
.seq_stop = cgroup_pidlist_stop,
@ -4157,13 +4171,12 @@ static struct cftype cgroup_base_files[] = {
},
{
.name = "notify_on_release",
.flags = CFTYPE_INSANE,
.read_u64 = cgroup_read_notify_on_release,
.write_u64 = cgroup_write_notify_on_release,
},
{
.name = "release_agent",
.flags = CFTYPE_INSANE | CFTYPE_ONLY_ON_ROOT,
.flags = CFTYPE_ONLY_ON_ROOT,
.seq_show = cgroup_release_agent_show,
.write = cgroup_release_agent_write,
.max_write_len = PATH_MAX - 1,
@ -4444,6 +4457,7 @@ static int cgroup_mkdir(struct kernfs_node *parent_kn, const char *name,
struct cgroup_root *root;
struct cgroup_subsys *ss;
struct kernfs_node *kn;
struct cftype *base_files;
int ssid, ret;
parent = cgroup_kn_lock_live(parent_kn);
@ -4514,7 +4528,12 @@ static int cgroup_mkdir(struct kernfs_node *parent_kn, const char *name,
if (ret)
goto out_destroy;
ret = cgroup_addrm_files(cgrp, cgroup_base_files, true);
if (cgroup_on_dfl(cgrp))
base_files = cgroup_dfl_base_files;
else
base_files = cgroup_legacy_base_files;
ret = cgroup_addrm_files(cgrp, base_files, true);
if (ret)
goto out_destroy;
@ -4836,7 +4855,8 @@ int __init cgroup_init(void)
unsigned long key;
int ssid, err;
BUG_ON(cgroup_init_cftypes(NULL, cgroup_base_files));
BUG_ON(cgroup_init_cftypes(NULL, cgroup_dfl_base_files));
BUG_ON(cgroup_init_cftypes(NULL, cgroup_legacy_base_files));
mutex_lock(&cgroup_mutex);