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DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1761607065; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=dxeBk//0vfxmCDXu0Ua3XftjTjzPqFj9JEVDoYRQlLo=; b=uHT3XV84WSMhGH7cmFl+7kM0vWfbc7wXTQ/mEMDZ4Lb6zZ3mGMbFtS8jEAoLnrqSegg2W5 v9TldZKy722Q4pqdAHezjhpWzEjt4+sVolqhBSb3fjC25cv6vC8BAeia7NVb4Cnr3x8B4b lGUOlrGJjO896IyjcThEmkbCJCeJC2U= From: Roman Gushchin To: Andrew Morton Cc: linux-kernel@vger.kernel.org, Alexei Starovoitov , Suren Baghdasaryan , Michal Hocko , Shakeel Butt , Johannes Weiner , Andrii Nakryiko , JP Kobryn , linux-mm@kvack.org, cgroups@vger.kernel.org, bpf@vger.kernel.org, Martin KaFai Lau , Song Liu , Kumar Kartikeya Dwivedi , Tejun Heo , Roman Gushchin Subject: [PATCH v2 02/23] bpf: initial support for attaching struct ops to cgroups Date: Mon, 27 Oct 2025 16:17:05 -0700 Message-ID: <20251027231727.472628-3-roman.gushchin@linux.dev> In-Reply-To: <20251027231727.472628-1-roman.gushchin@linux.dev> References: <20251027231727.472628-1-roman.gushchin@linux.dev> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT X-Rspamd-Queue-Id: 89A00180007 X-Rspamd-Server: rspam11 X-Rspam-User: X-Stat-Signature: x77a48cbqhbpukdjkzaazyh7yy37eodq X-HE-Tag: 1761607066-214954 X-HE-Meta: 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 N95NkPLy 4nnf1N1QK5Bcm6bR6gL49oSDpSv6iJzN6YWIPQ0R5gyBSmTvlHZUV64HgzkfO/q8Wzi41o0CkflGB2gN0wcGzKAGh6G/VWG4agr537V+QakGavdkOIeHV1QbB7SnB1bzqAQk/zyaJwY9bXEkaWmvSbs9YN67juk11f/YuIilFI6iqcAw/Mj4WO9yzqZ7YWTOjkpKEiQ4EuUIoNKPB6nmO5TgLpF015MxUoGro/tjtQURsmco= 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: 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 | 13 +++++++++++++ 2 files changed, 14 insertions(+) diff --git a/include/linux/bpf.h b/include/linux/bpf.h index eae907218188..7205b813e25f 100644 --- a/include/linux/bpf.h +++ b/include/linux/bpf.h @@ -1849,6 +1849,7 @@ 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 45cc5ee19dc2..58664779a2b6 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; @@ -1359,6 +1360,18 @@ 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)) + return PTR_ERR(cgrp); + + link->cgroup_id = cgroup_id(cgrp); + cgroup_put(cgrp); + } +#endif /* CONFIG_CGROUPS */ err = bpf_link_prime(&link->link, &link_primer); if (err) -- 2.51.0