Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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>
+7
+7
io_uring/bpf_filter.c
+7
io_uring/bpf_filter.c
···
15
15
#include "openclose.h"
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struct io_bpf_filter {
18
+
refcount_t refs;
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struct bpf_prog *prog;
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struct io_bpf_filter *next;
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};
···
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*/
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if (f == &dummy_filter)
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break;
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+
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+
/* Someone still holds a ref, stop iterating. */
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+
if (!refcount_dec_and_test(&f->refs))
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+
break;
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+
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bpf_prog_destroy(f->prog);
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kfree(f);
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f = next;
···
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298
ret = -ENOMEM;
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goto err;
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}
301
+
refcount_set(&filter->refs, 1);
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filter->prog = prog;
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res->bpf_filters = filters;
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