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cgroup: Add bpf prog revisions to struct cgroup_bpf

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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: Yonghong Song <yonghong.song@linux.dev>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20250606163136.2428732-1-yonghong.song@linux.dev
This commit is contained in:
Yonghong Song 2025-06-06 09:31:36 -07:00 committed by Andrii Nakryiko
parent e41079f53e
commit 9b8367b604
2 changed files with 6 additions and 0 deletions
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1
include/linux/bpf-cgroup-defs.h
View File

@ -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;

5
kernel/cgroup/cgroup.c
View File

@ -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);
}