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Merge branch 'for-3.11-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup

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Pull cgroup changes from Tejun Heo:
 "This contains two patches, both of which aren't fixes per-se but I
  think it'd be better to fast-track them.

  One removes bcache_subsys_id which was added without proper review
  through the block tree.  Fortunately, bcache cgroup code is
  unconditionally disabled, so this was never exposed to userland.  The
  cgroup subsys_id is removed.  Kent will remove the affected (disabled)
  code through bcache branch.

  The other simplifies task_group_path_from_hierarchy().  The function
  doesn't currently have in-kernel users but there are external code and
  development going on dependent on the function and making the function
  available for 3.11 would make things go smoother"

* 'for-3.11-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup:
  cgroup: replace task_cgroup_path_from_hierarchy() with task_cgroup_path()
  cgroup: remove bcache_subsys_id which got added stealthily
This commit is contained in:
Linus Torvalds 2013-07-23 15:48:35 -07:00
commit c2468d32f5
3 changed files with 27 additions and 52 deletions
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31
kernel/cgroup.c
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@ -1845,36 +1845,43 @@ out:
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