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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 /include
parent0b5d404e349c0236b11466c0a4785520c0be6982 (diff)
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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 'include')
-rw-r--r--include/linux/cgroup.h11
1 files changed, 10 insertions, 1 deletions
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index ed3e92e41c6..5a53d8f039a 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -578,7 +578,11 @@ struct task_struct *cgroup_iter_next(struct cgroup *cgrp,
void cgroup_iter_end(struct cgroup *cgrp, struct cgroup_iter *it);
int cgroup_scan_tasks(struct cgroup_scanner *scan);
int cgroup_attach_task(struct cgroup *, struct task_struct *);
-int cgroup_attach_task_current_cg(struct task_struct *);
+int cgroup_attach_task_all(struct task_struct *from, struct task_struct *);
+static inline int cgroup_attach_task_current_cg(struct task_struct *tsk)
+{
+ return cgroup_attach_task_all(current, tsk);
+}
/*
* CSS ID is ID for cgroup_subsys_state structs under subsys. This only works
@@ -636,6 +640,11 @@ static inline int cgroupstats_build(struct cgroupstats *stats,
}
/* No cgroups - nothing to do */
+static inline int cgroup_attach_task_all(struct task_struct *from,
+ struct task_struct *t)
+{
+ return 0;
+}
static inline int cgroup_attach_task_current_cg(struct task_struct *t)
{
return 0;