On May 19, 2021, at 7:13 AM, Pavel Begunkov [off-list ref] wrote:

[de]register BPF programs through io_uring_register() with new
IORING_ATTACH_BPF and IORING_DETACH_BPF commands.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
---
fs/io_uring.c                 | 81 +++++++++++++++++++++++++++++++++++
include/uapi/linux/io_uring.h |  2 +
2 files changed, 83 insertions(+)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 882b16b5e5eb..b13cbcd5c47b 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c

@@ -78,6 +78,7 @@

#include <linux/task_work.h>
#include <linux/pagemap.h>
#include <linux/io_uring.h>
+#include <linux/bpf.h>

#define CREATE_TRACE_POINTS
#include <trace/events/io_uring.h>

@@ -103,6 +104,8 @@

#define IORING_MAX_RESTRICTIONS	(IORING_RESTRICTION_LAST + \
				 IORING_REGISTER_LAST + IORING_OP_LAST)

+#define IORING_MAX_BPF_PROGS	100

+
#define SQE_VALID_FLAGS	(IOSQE_FIXED_FILE|IOSQE_IO_DRAIN|IOSQE_IO_LINK|	\
				IOSQE_IO_HARDLINK | IOSQE_ASYNC | \
				IOSQE_BUFFER_SELECT)

@@ -266,6 +269,10 @@ struct io_restriction {

	bool registered;
};