Commit 489809e2 authored by Pavel Begunkov's avatar Pavel Begunkov Committed by Jens Axboe
Browse files

io_uring: increase max number of reg buffers 



Since recent changes instead of storing a large array of struct
io_mapped_ubuf, we store pointers to them, that is 4 times slimmer and
we should not to so worry about restricting max number of registererd
buffer slots, increase the limit 4 times.

Signed-off-by: default avatarPavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/d3dee1da37f46da416aa96a16bf9e5094e10584d.1620990371.git.asml.silence@gmail.com


Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 2d74d042

fs/io_uring.c

+3 −1
Original line number Diff line number Diff line
@@ -100,6 +100,8 @@ 
#define IORING_MAX_RESTRICTIONS	(IORING_RESTRICTION_LAST + \

				 IORING_REGISTER_LAST + IORING_OP_LAST)



#define IORING_MAX_REG_BUFFERS	(1U << 14)



#define SQE_VALID_FLAGS	(IOSQE_FIXED_FILE|IOSQE_IO_DRAIN|IOSQE_IO_LINK|	\

				IOSQE_IO_HARDLINK | IOSQE_ASYNC | \

				IOSQE_BUFFER_SELECT)
@@ -8389,7 +8391,7 @@ static int io_sqe_buffers_register(struct io_ring_ctx *ctx, void __user *arg, 


	if (ctx->user_bufs)

		return -EBUSY;

	if (!nr_args || nr_args > UIO_MAXIOV)

	if (!nr_args || nr_args > IORING_MAX_REG_BUFFERS)

		return -EINVAL;

	ret = io_rsrc_node_switch_start(ctx);

	if (ret)