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UPSTREAM: kernfs: add exportfs operations

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Now we have the facilities to implement exportfs operations. The idea is
cgroup can export the fhandle info to userspace, then userspace uses
fhandle to find the cgroup name. Another example is userspace can get
fhandle for a cgroup and BPF uses the fhandle to filter info for the
cgroup.

Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sorayukii <sorayukii69@gmail.com>
This commit is contained in:
Shaohua Li 2017-07-12 11:49:51 -07:00 • committed by Sorayukii
commit fe8db576ef
1 changed files with 70 additions and 1 deletions
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3
kernel/cgroup/cgroup.c
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@ -1973,7 +1973,8 @@ int cgroup_setup_root(struct cgroup_root *root, u16 ss_mask)
&cgroup_kf_syscall_ops : &cgroup1_kf_syscall_ops;
root->kf_root = kernfs_create_root(kf_sops,
KERNFS_ROOT_CREATE_DEACTIVATED,
KERNFS_ROOT_CREATE_DEACTIVATED |
KERNFS_ROOT_SUPPORT_EXPORTOP,
root_cgrp);
if (IS_ERR(root->kf_root)) {
ret = PTR_ERR(root->kf_root);