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cgroup: enable cgroup_get_from_file() on cgroup1

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cgroup_get_from_file() currently fails with -EBADF if called on cgroup
v1. However, the current implementation works on cgroup v1 as well, so
the restriction is unnecessary.

This enabled cgroup_get_from_fd() to work on cgroup v1, which would be
the only thing stopping bpf cgroup_iter from supporting cgroup v1.

Signed-off-by: Yosry Ahmed <yosryahmed@google.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Hao Luo <haoluo@google.com>
Link: https://lore.kernel.org/r/20220805214821.1058337-3-haoluo@google.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Yosry Ahmed 2022-08-05 14:48:15 -07:00 committed by Alexei Starovoitov
parent fa96b24204
commit f3a2aebdd6
1 changed files with 0 additions and 5 deletions
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5
kernel/cgroup/cgroup.c
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@ -6132,11 +6132,6 @@ static struct cgroup *cgroup_get_from_file(struct file *f)
return ERR_CAST(css);
cgrp = css->cgroup;
if (!cgroup_on_dfl(cgrp)) {
cgroup_put(cgrp);
return ERR_PTR(-EBADF);
}
return cgrp;
}