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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>
This commit is contained in:
Shaohua Li 2017-07-12 11:49:52 -07:00 committed by Jens Axboe
parent aa81882534
commit 121508df44
1 changed files with 8 additions and 0 deletions
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8
include/linux/cgroup.h
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@ -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)