diff options
| author | Shaohua Li <shli@fb.com> | 2017-07-12 11:49:52 -0700 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2017-07-29 09:00:03 -0600 |
| commit | 121508df44d074245a72eda6b067478218480a40 (patch) | |
| tree | 3811dbdbf764aa2b4cda99d87aa58793f2a747e1 | |
| parent | aa8188253474b4053bc2900d9fcb545ce68bdf5c (diff) | |
cgroup: export fhandle info for a cgroup
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_INO32_GEN_PARENT' type fhandle,
we only need export the inode number and generation number just like
what generic_fh_to_dentry does. And we can avoid the overhead of getting
an inode too, since kernfs_node_id (ino and generation) has all the info
required.
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
| -rw-r--r-- | include/linux/cgroup.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h index 30c68773fd1e..52ef9a68ff14 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 union kernfs_node_id *cgroup_get_kernfs_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 union kernfs_node_id *cgroup_get_kernfs_id(struct cgroup *cgrp) +{ + return NULL; +} static inline bool task_under_cgroup_hierarchy(struct task_struct *task, struct cgroup *ancestor) |