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DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1769418209; 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=ud2bx3TEMtPgGp8z9l0owlnpj/NWdkQzdMWzUV6IHhmPv+afJYoJ7IIdwVRMloPKltQlvw FQmrztNLMufNKeF1BrzsNQbomsBldDjN2Hfb8Z2Z9HFOPwzyYDRyM+oobxVNJMwW2QDu6U /uEQiGHQD90+yXc7b4Gz4aNQFNrWppE= 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 v4 02/12] bpf: initial support for attaching struct ops to cgroups Date: Mon, 26 Jan 2026 17:02:26 +0800 Message-ID: <1c5845208d235e5deb37807f3be93af325033ba5.1769417588.git.zhuhui@kylinos.cn> In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT X-Rspamd-Server: rspam12 X-Stat-Signature: oh4hwiq54crzsgjbnp6oqjmn58fqtj9c X-Rspamd-Queue-Id: 860C0120002 X-Rspam-User: X-HE-Tag: 1769418211-772699 X-HE-Meta: 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 zi24oJCx Q8eNV7g1DzFWCimqVc3aLDGbpX++5OVSeUDN3UACmQnUF+RMxDmTijnwSNPCyESAA77Z6JeidYdvU+Vfi6USfTb4yfuUDHICAs/K7ZwRBkIFmkDFXxVcqZwk6yAWD4ZBcc0HLGEoEaMEGjrIkY2d1Qiai83Y7hisiMUbSiC+I7A8lXPRoQAIy0pyZ6uTybxPXYHlxEDyK4klncMqbsV5lOGYN9PbZ+sQ3L3uugMWXhvN38qOj5+P4OtHVWNSPvmXTI3K7ObWaezxfw7M= 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