Messages in this thread Patch in this message | | | Date | Tue, 10 May 2022 00:18:04 +0000 | Subject | [RFC PATCH bpf-next 6/9] cgroup: add v1 support to cgroup_get_from_id() | From | Yosry Ahmed <> |
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The current implementation of cgroup_get_from_id() only searches the default hierarchy for the given id. Make it compatible with cgroup v1 by looking through all the roots instead.
cgrp_dfl_root should be the first element in the list so there shouldn't be a performance impact for cgroup v2 users (in the case of a valid id).
Signed-off-by: Yosry Ahmed <yosryahmed@google.com> --- kernel/cgroup/cgroup.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c index af703cfcb9d2..12700cd21973 100644 --- a/kernel/cgroup/cgroup.c +++ b/kernel/cgroup/cgroup.c @@ -5970,10 +5970,16 @@ void cgroup_path_from_kernfs_id(u64 id, char *buf, size_t buflen) */ struct cgroup *cgroup_get_from_id(u64 id) { - struct kernfs_node *kn; + struct kernfs_node *kn = NULL; struct cgroup *cgrp = NULL; + struct cgroup_root *root; + + for_each_root(root) { + kn = kernfs_find_and_get_node_by_id(root->kf_root, id); + if (kn) + break; + } - kn = kernfs_find_and_get_node_by_id(cgrp_dfl_root.kf_root, id); if (!kn) goto out; -- 2.36.0.512.ge40c2bad7a-goog
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