From: Shaohua Li <shli@xxxxxx>
Add an API to export cgroup fhandle info. We don't export a full 'struct
file_handle', there are unrequired info. Sepcifically, cgroup is always
a directory, so we don't need a 'FILEID_KERNFS_WITH_PARENT' type
fhandle, we only need export the inode number and generation number.
Since the first part of 'kernfs_fid' and 'kernfs_node_id' have the same
layout, we can just export a 'kernfs_node_id'.
Signed-off-by: Shaohua Li <shli@xxxxxx>
---
include/linux/cgroup.h | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index 30c6877..5ebe89f 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -609,6 +609,10 @@ static inline void cgroup_kthread_ready(void)
current->no_cgroup_migration = 0;
}
+static inline struct kernfs_node_id *cgroup_get_node_id(struct cgroup *cgrp)
+{
+ return &cgrp->kn->id;
+}
#else /* !CONFIG_CGROUPS */
struct cgroup_subsys_state;
@@ -631,6 +635,10 @@ static inline int cgroup_init_early(void) { return 0; }
static inline int cgroup_init(void) { return 0; }
static inline void cgroup_init_kthreadd(void) {}
static inline void cgroup_kthread_ready(void) {}
+static inline struct kernfs_node_id *cgroup_get_node_id(struct cgroup *cgrp)
+{
+ return NULL;
+}
static inline bool task_under_cgroup_hierarchy(struct task_struct *task,
struct cgroup *ancestor)
--
2.9.3
