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authorMichael S. Tsirkin <mst@redhat.com>2010-08-06 01:59:14 +0300
committerMichael S. Tsirkin <mst@redhat.com>2010-09-05 17:01:37 +0300
commit73457f0f836956747e0394320be2163c050e96ef (patch)
treeec0b11057cce5d93800876f4a89a2bcdbc91b69e /kernel
parent0b5d404e349c0236b11466c0a4785520c0be6982 (diff)
cgroups: fix API thinko
cgroup_attach_task_current_cg API that have upstream is backwards: we really need an API to attach to the cgroups from another process A to the current one. In our case (vhost), a priveledged user wants to attach it's task to cgroups from a less priveledged one, the API makes us run it in the other task's context, and this fails. So let's make the API generic and just pass in 'from' and 'to' tasks. Add an inline wrapper for cgroup_attach_task_current_cg to avoid breaking bisect. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Acked-by: Li Zefan <lizf@cn.fujitsu.com> Acked-by: Paul Menage <menage@google.com>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/cgroup.c9
1 files changed, 5 insertions, 4 deletions
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index a8ce0995440..9d90c08f3bd 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -1789,10 +1789,11 @@ out:
}
/**
- * cgroup_attach_task_current_cg - attach task 'tsk' to current task's cgroup
+ * cgroup_attach_task_all - attach task 'tsk' to all cgroups of task 'from'
+ * @from: attach to all cgroups of a given task
* @tsk: the task to be attached
*/
-int cgroup_attach_task_current_cg(struct task_struct *tsk)
+int cgroup_attach_task_all(struct task_struct *from, struct task_struct *tsk)
{
struct cgroupfs_root *root;
struct cgroup *cur_cg;
@@ -1800,7 +1801,7 @@ int cgroup_attach_task_current_cg(struct task_struct *tsk)
cgroup_lock();
for_each_active_root(root) {
- cur_cg = task_cgroup_from_root(current, root);
+ cur_cg = task_cgroup_from_root(from, root);
retval = cgroup_attach_task(cur_cg, tsk);
if (retval)
break;
@@ -1809,7 +1810,7 @@ int cgroup_attach_task_current_cg(struct task_struct *tsk)
return retval;
}
-EXPORT_SYMBOL_GPL(cgroup_attach_task_current_cg);
+EXPORT_SYMBOL_GPL(cgroup_attach_task_all);
/*
* Attach task with pid 'pid' to cgroup 'cgrp'. Call with cgroup_mutex