[PATCH 2/4] io_uring: add registered request arguments

[Pavel Begunkov <asml.silence@gmail.com>]

Similarly to registered wait arguments we want to have a pre-mapped
space for various request arguments. Use the same parameter region,
however as ->wait_args has different lifetime rules, add a new instance
of struct io_reg_args.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
---
 include/linux/io_uring_types.h | 2 ++
 io_uring/register.c            | 3 +++
 2 files changed, 5 insertions(+)

diff --git a/include/linux/io_uring_types.h b/include/linux/io_uring_types.h
index 49008f00d064..cd6642855533 100644
--- a/include/linux/io_uring_types.h
+++ b/include/linux/io_uring_types.h
@@ -299,6 +299,8 @@ struct io_ring_ctx {
 
 		struct io_submit_state	submit_state;
 
+		struct io_reg_args	sqe_args;
+
 		/*
 		 * Modifications are protected by ->uring_lock and ->mmap_lock.
 		 * The flags, buf_pages and buf_nr_pages fields should be stable
diff --git a/io_uring/register.c b/io_uring/register.c
index b926eb053408..d2232b90a81d 100644
--- a/io_uring/register.c
+++ b/io_uring/register.c
@@ -607,6 +607,9 @@ static int io_register_mem_region(struct io_ring_ctx *ctx, void __user *uarg)
 		ctx->wait_args.ptr = io_region_get_ptr(&ctx->param_region);
 		ctx->wait_args.size = rd.size;
 	}
+
+	ctx->sqe_args.ptr = io_region_get_ptr(&ctx->param_region);
+	ctx->sqe_args.size = rd.size;
 	return 0;
 }
 
-- 
2.47.1