kernfs: add exportfs operations
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: NGreg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: NShaohua Li <shli@fb.com> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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