diff options
| author | Jens Axboe <axboe@kernel.dk> | 2026-01-16 14:37:28 -0700 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2026-01-27 11:10:46 -0700 |
| commit | e7f67c2be7877a3d44aa79b8d22eae8cb6e2c6d6 (patch) | |
| tree | 71c9823078457158bd03549018f755542bf99faf /io_uring | |
| parent | e7c30675a7fb79d94400987865a3bd620458ca1a (diff) | |
io_uring/bpf_filter: add ref counts to struct io_bpf_filter
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.
Reviewed-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'io_uring')
| -rw-r--r-- | io_uring/bpf_filter.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/io_uring/bpf_filter.c b/io_uring/bpf_filter.c index 1409d625b686..b94944ab8442 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; }; @@ -125,6 +126,11 @@ 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; @@ -298,6 +304,7 @@ 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; |