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Mon, 19 Jan 2026 15:55:04 -0800 (PST) From: Jens Axboe To: io-uring@vger.kernel.org Cc: brauner@kernel.org, jannh@google.com, kees@kernel.org, linux-kernel@vger.kernel.org, Jens Axboe Subject: [PATCH 5/7] io_uring/bpf_filter: add ref counts to struct io_bpf_filter Date: Mon, 19 Jan 2026 16:54:28 -0700 Message-ID: <20260119235456.1722452-6-axboe@kernel.dk> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260119235456.1722452-1-axboe@kernel.dk> References: <20260119235456.1722452-1-axboe@kernel.dk> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit In preparation for allowing inheritance of BPF filters and filter tables, add a reference count to the filter. This allows multiple tables to safely include the same filter. Signed-off-by: Jens Axboe --- io_uring/bpf_filter.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/io_uring/bpf_filter.c b/io_uring/bpf_filter.c index 06fad04c4b54..fc9eaf29fcbf 100644 --- a/io_uring/bpf_filter.c +++ b/io_uring/bpf_filter.c @@ -15,6 +15,7 @@ #include "openclose.h" struct io_bpf_filter { + refcount_t refs; struct bpf_prog *prog; struct io_bpf_filter *next; }; @@ -129,6 +130,11 @@ static void io_free_bpf_filters(struct rcu_head *head) */ if (f == &dummy_filter) break; + + /* Someone still holds a ref, stop iterating. */ + if (!refcount_dec_and_test(&f->refs)) + break; + bpf_prog_destroy(f->prog); kfree(f); f = next; @@ -304,6 +310,7 @@ int io_register_bpf_filter(struct io_restriction *res, ret = -ENOMEM; goto err; } + refcount_set(&filter->refs, 1); filter->prog = prog; res->bpf_filters = filters; -- 2.51.0