Commit a90558b3 authored by Pavel Begunkov's avatar Pavel Begunkov Committed by Jens Axboe
Browse files

io_uring/memmap: helper for pinning region pages 



In preparation to adding kernel allocated regions extract a new helper
that pins user pages.

Signed-off-by: default avatarPavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/a17d7c39c3de4266b66b75b2dcf768150e1fc618.1732886067.git.asml.silence@gmail.com


Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent c4d0ac1c

io_uring/memmap.c

+21 −7
Original line number Diff line number Diff line
@@ -246,10 +246,28 @@ static int io_region_init_ptr(struct io_mapped_region *mr) 
	return 0;

}



int io_create_region(struct io_ring_ctx *ctx, struct io_mapped_region *mr,

static int io_region_pin_pages(struct io_ring_ctx *ctx,

				struct io_mapped_region *mr,

				struct io_uring_region_desc *reg)

{

	unsigned long size = mr->nr_pages << PAGE_SHIFT;

	struct page **pages;

	int nr_pages;



	pages = io_pin_pages(reg->user_addr, size, &nr_pages);

	if (IS_ERR(pages))

		return PTR_ERR(pages);

	if (WARN_ON_ONCE(nr_pages != mr->nr_pages))

		return -EFAULT;



	mr->pages = pages;

	mr->flags |= IO_REGION_F_USER_PROVIDED;

	return 0;

}



int io_create_region(struct io_ring_ctx *ctx, struct io_mapped_region *mr,

		     struct io_uring_region_desc *reg)

{

	int nr_pages, ret;

	u64 end;
@@ -278,13 +296,9 @@ int io_create_region(struct io_ring_ctx *ctx, struct io_mapped_region *mr, 
	}

	mr->nr_pages = nr_pages;



	pages = io_pin_pages(reg->user_addr, reg->size, &nr_pages);

	if (IS_ERR(pages)) {

		ret = PTR_ERR(pages);

	ret = io_region_pin_pages(ctx, mr, reg);

	if (ret)

		goto out_free;

	}

	mr->pages = pages;

	mr->flags |= IO_REGION_F_USER_PROVIDED;



	ret = io_region_init_ptr(mr);

	if (ret)