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cgroup: Merge branch 'for-3.11-fixes' into for-3.12

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for-3.12 branch is about to receive invasive updates which are
dependent on da0a12caff ("cgroup: fix a leak when percpu_ref_init()
fails").  Given the amount of scheduled changes, I think it'd less
painful to pull in for-3.11-fixes as preparation.  Pull in
for-3.11-fixes into for-3.12.

Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Tejun Heo 2013-08-02 16:12:13 -04:00
commit 61584e3f49
3 changed files with 30 additions and 53 deletions
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3
include/linux/cgroup.h
View File

@ -548,8 +548,7 @@ int cgroup_rm_cftypes(struct cgroup_subsys *ss, struct cftype *cfts);
bool cgroup_is_descendant(struct cgroup *cgrp, struct cgroup *ancestor);
int cgroup_path(const struct cgroup *cgrp, char *buf, int buflen);
int task_cgroup_path_from_hierarchy(struct task_struct *task, int hierarchy_id,
char *buf, size_t buflen);
int task_cgroup_path(struct task_struct *task, char *buf, size_t buflen);
int cgroup_task_count(const struct cgroup *cgrp);

45
include/linux/cgroup_subsys.h
View File

@ -1,86 +1,55 @@
/* Add subsystem definitions of the form SUBSYS(<name>) in this
* file. Surround each one by a line of comment markers so that
* patches don't collide
/*
* List of cgroup subsystems.
*
* DO NOT ADD ANY SUBSYSTEM WITHOUT EXPLICIT ACKS FROM CGROUP MAINTAINERS.
*/
/* */
/* */
#if IS_SUBSYS_ENABLED(CONFIG_CPUSETS)
SUBSYS(cpuset)
#endif
/* */
#if IS_SUBSYS_ENABLED(CONFIG_CGROUP_DEBUG)
SUBSYS(debug)
#endif
/* */
#if IS_SUBSYS_ENABLED(CONFIG_CGROUP_SCHED)
SUBSYS(cpu_cgroup)
#endif
/* */
#if IS_SUBSYS_ENABLED(CONFIG_CGROUP_CPUACCT)
SUBSYS(cpuacct)
#endif
/* */
#if IS_SUBSYS_ENABLED(CONFIG_MEMCG)
SUBSYS(mem_cgroup)
#endif
/* */
#if IS_SUBSYS_ENABLED(CONFIG_CGROUP_DEVICE)
SUBSYS(devices)
#endif
/* */
#if IS_SUBSYS_ENABLED(CONFIG_CGROUP_FREEZER)
SUBSYS(freezer)
#endif
/* */
#if IS_SUBSYS_ENABLED(CONFIG_NET_CLS_CGROUP)
SUBSYS(net_cls)
#endif
/* */
#if IS_SUBSYS_ENABLED(CONFIG_BLK_CGROUP)
SUBSYS(blkio)
#endif
/* */
#if IS_SUBSYS_ENABLED(CONFIG_CGROUP_PERF)
SUBSYS(perf)
#endif
/* */
#if IS_SUBSYS_ENABLED(CONFIG_NETPRIO_CGROUP)
SUBSYS(net_prio)
#endif
/* */
#if IS_SUBSYS_ENABLED(CONFIG_CGROUP_HUGETLB)
SUBSYS(hugetlb)
#endif
/* */
#ifdef CONFIG_CGROUP_BCACHE
SUBSYS(bcache)
#endif
/* */
/*
* DO NOT ADD ANY SUBSYSTEM WITHOUT EXPLICIT ACKS FROM CGROUP MAINTAINERS.
*/

35
kernel/cgroup.c
View File

@ -1805,36 +1805,43 @@ int cgroup_path(const struct cgroup *cgrp, char *buf, int buflen)
EXPORT_SYMBOL_GPL(cgroup_path);
/**
* task_cgroup_path_from_hierarchy - cgroup path of a task on a hierarchy
* task_cgroup_path - cgroup path of a task in the first cgroup hierarchy
* @task: target task
* @hierarchy_id: the hierarchy to look up @task's cgroup from
* @buf: the buffer to write the path into
* @buflen: the length of the buffer
*
* Determine @task's cgroup on the hierarchy specified by @hierarchy_id and
* copy its path into @buf. This function grabs cgroup_mutex and shouldn't
* be used inside locks used by cgroup controller callbacks.
* Determine @task's cgroup on the first (the one with the lowest non-zero
* hierarchy_id) cgroup hierarchy and copy its path into @buf. This
* function grabs cgroup_mutex and shouldn't be used inside locks used by
* cgroup controller callbacks.
*
* Returns 0 on success, fails with -%ENAMETOOLONG if @buflen is too short.
*/
int task_cgroup_path_from_hierarchy(struct task_struct *task, int hierarchy_id,
char *buf, size_t buflen)
int task_cgroup_path(struct task_struct *task, char *buf, size_t buflen)
{
struct cgroupfs_root *root;
struct cgroup *cgrp = NULL;
int ret = -ENOENT;
struct cgroup *cgrp;
int hierarchy_id = 1, ret = 0;
if (buflen < 2)
return -ENAMETOOLONG;
mutex_lock(&cgroup_mutex);
root = idr_find(&cgroup_hierarchy_idr, hierarchy_id);
root = idr_get_next(&cgroup_hierarchy_idr, &hierarchy_id);
if (root) {
cgrp = task_cgroup_from_root(task, root);
ret = cgroup_path(cgrp, buf, buflen);
} else {
/* if no hierarchy exists, everyone is in "/" */
memcpy(buf, "/", 2);
}
mutex_unlock(&cgroup_mutex);
return ret;
}
EXPORT_SYMBOL_GPL(task_cgroup_path_from_hierarchy);
EXPORT_SYMBOL_GPL(task_cgroup_path);
/*
* Control Group taskset
@ -4304,8 +4311,10 @@ static long cgroup_create(struct cgroup *parent, struct dentry *dentry,
}
err = percpu_ref_init(&css->refcnt, css_release);
if (err)
if (err) {
ss->css_free(cgrp);
goto err_free_all;
}
init_cgroup_css(css, ss, cgrp);