Commit 9b8367b6 authored by Yonghong Song's avatar Yonghong Song Committed by Andrii Nakryiko
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cgroup: Add bpf prog revisions to struct cgroup_bpf 



One of key items in mprog API is revision for prog list. The revision
number will be increased if the prog list changed, e.g., attach, detach
or replace.

Add 'revisions' field to struct cgroup_bpf, representing revisions for
all cgroup related attachment types. The initial revision value is
set to 1, the same as kernel mprog implementations.

Signed-off-by: default avatarYonghong Song <yonghong.song@linux.dev>
Signed-off-by: default avatarAndrii Nakryiko <andrii@kernel.org>
Acked-by: default avatarAndrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20250606163136.2428732-1-yonghong.song@linux.dev
parent e41079f5

include/linux/bpf-cgroup-defs.h

+1 −0
Original line number Diff line number Diff line
@@ -63,6 +63,7 @@ struct cgroup_bpf { 
	 */

	struct hlist_head progs[MAX_CGROUP_BPF_ATTACH_TYPE];

	u8 flags[MAX_CGROUP_BPF_ATTACH_TYPE];

	u64 revisions[MAX_CGROUP_BPF_ATTACH_TYPE];



	/* list of cgroup shared storages */

	struct list_head storages;

kernel/cgroup/cgroup.c

+5 −0
Original line number Diff line number Diff line
@@ -2074,6 +2074,11 @@ static void init_cgroup_housekeeping(struct cgroup *cgrp) 
	for_each_subsys(ss, ssid)

		INIT_LIST_HEAD(&cgrp->e_csets[ssid]);



#ifdef CONFIG_CGROUP_BPF

	for (int i = 0; i < ARRAY_SIZE(cgrp->bpf.revisions); i++)

		cgrp->bpf.revisions[i] = 1;

#endif



	init_waitqueue_head(&cgrp->offline_waitq);

	INIT_WORK(&cgrp->release_agent_work, cgroup1_release_agent);

}