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DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1770195452; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=ycrFyw6aXaYmQPmQruEJsfLSWjPHoV8ar+xnlNHnd9w=; b=fJcycJ2X9rvYYkieCQ2yF+bDxhFJWsVBjVISmDnDnsCv/zx1kwxX6wGWFsYkte5c7bZ3OR k52PQo0K06QaemtcyTAwbomydY8NZytTT++M5okta4pi9qhc/4LM4sTWrQ9W+NLM3YNKMI IiJ2at1yBuTGr9ZHYnUZFjdfBCxikoI= From: Hui Zhu To: Andrew Morton , Johannes Weiner , Michal Hocko , Roman Gushchin , Shakeel Butt , Muchun Song , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Eduard Zingerman , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , Shuah Khan , Peter Zijlstra , Miguel Ojeda , Nathan Chancellor , Kees Cook , Tejun Heo , Jeff Xu , mkoutny@suse.com, Jan Hendrik Farr , Christian Brauner , Randy Dunlap , Brian Gerst , Masahiro Yamada , davem@davemloft.net, Jakub Kicinski , Jesper Dangaard Brouer , JP Kobryn , Willem de Bruijn , Jason Xing , Paul Chaignon , Anton Protopopov , Amery Hung , Chen Ridong , Lance Yang , Jiayuan Chen , linux-kernel@vger.kernel.org, linux-mm@kvack.org, cgroups@vger.kernel.org, bpf@vger.kernel.org, netdev@vger.kernel.org, linux-kselftest@vger.kernel.org Subject: [RFC PATCH bpf-next v6 02/12] bpf: initial support for attaching struct ops to cgroups Date: Wed, 4 Feb 2026 16:56:23 +0800 Message-ID: <3ddbac0ce63baf8574ba430f307cd542f489d592.1770194182.git.zhuhui@kylinos.cn> In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 48E0BA0002 X-Stat-Signature: 85gy6wuqyk4qy43nsjrte5s5j3qbwocb X-Rspam-User: X-HE-Tag: 1770195454-240690 X-HE-Meta: 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 cZW5BYyx tYpHEuST3p7I+GyMGD1QfNgQQBZJW5kl30l2qsIB0XNVRx7EIca7OC7VKanMPte0gZXGaaIZytKsSqhcJHAQH6nVaByp8CmT4934X1KUIrGfFLZAcxu1nr7+gSZu5HNHSkkeb6NMPYXu1Iplq1CHX+C/0GZTbL74ckyL2F2sHcb/EizlDvTAE2Be39eTFIL3ha6YSUtErIgMJj+HW7bJ36zBds6PLgAsADh/QBnweM6wHQkEWwkYhMC0aKDX8hKi4GiDqGTDRKzTApAg= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Roman Gushchin When a struct ops is being attached and a bpf link is created, allow to pass a cgroup fd using bpf attr, so that struct ops can be attached to a cgroup instead of globally. Attached struct ops doesn't hold a reference to the cgroup, only preserves cgroup id. Signed-off-by: Roman Gushchin --- include/linux/bpf.h | 1 + kernel/bpf/bpf_struct_ops.c | 15 +++++++++++++++ 2 files changed, 16 insertions(+) diff --git a/include/linux/bpf.h b/include/linux/bpf.h index 899dd911dc82..720055d1dbce 100644 --- a/include/linux/bpf.h +++ b/include/linux/bpf.h @@ -1895,6 +1895,7 @@ struct bpf_struct_ops_link { struct bpf_link link; struct bpf_map __rcu *map; wait_queue_head_t wait_hup; + u64 cgroup_id; }; struct bpf_link_primer { diff --git a/kernel/bpf/bpf_struct_ops.c b/kernel/bpf/bpf_struct_ops.c index de01cf3025b3..c807793e7633 100644 --- a/kernel/bpf/bpf_struct_ops.c +++ b/kernel/bpf/bpf_struct_ops.c @@ -13,6 +13,7 @@ #include #include #include +#include struct bpf_struct_ops_value { struct bpf_struct_ops_common_value common; @@ -1377,6 +1378,20 @@ int bpf_struct_ops_link_create(union bpf_attr *attr) } bpf_link_init(&link->link, BPF_LINK_TYPE_STRUCT_OPS, &bpf_struct_ops_map_lops, NULL, attr->link_create.attach_type); +#ifdef CONFIG_CGROUPS + if (attr->link_create.cgroup.relative_fd) { + struct cgroup *cgrp; + + cgrp = cgroup_get_from_fd(attr->link_create.cgroup.relative_fd); + if (IS_ERR(cgrp)) { + err = PTR_ERR(cgrp); + goto err_out; + } + + link->cgroup_id = cgroup_id(cgrp); + cgroup_put(cgrp); + } +#endif /* CONFIG_CGROUPS */ err = bpf_link_prime(&link->link, &link_primer); if (err) -- 2.43.0