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io_uring/memmap: helper for pinning region pages

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

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/a17d7c39c3de4266b66b75b2dcf768150e1fc618.1732886067.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2024-11-29 13:34:29 +00:00 committed by Jens Axboe
parent 086bbdf479
commit 9a123dadff
1 changed files with 21 additions and 7 deletions
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28
io_uring/memmap.c
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@ -246,10 +246,28 @@ static int io_region_init_ptr(struct io_mapped_region *mr)
return 0;
}
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)
{
struct page **pages;
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)