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io_uring/memmap: add IO_REGION_F_SINGLE_REF

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Kernel allocated compound pages will have just one reference for the
entire page array, add a flag telling io_free_region about that.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/a7abfa7535e9728d5fcade29a1ea1605ec2c04ce.1732886067.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2024-11-29 13:34:30 +00:00 committed by Jens Axboe
parent 9a123dadff
commit 2d34427a25
1 changed files with 10 additions and 2 deletions
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12
io_uring/memmap.c
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@ -207,15 +207,23 @@ enum {
IO_REGION_F_VMAP = 1,
/* memory is provided by user and pinned by the kernel */
IO_REGION_F_USER_PROVIDED = 2,
/* only the first page in the array is ref'ed */
IO_REGION_F_SINGLE_REF = 4,
};
void io_free_region(struct io_ring_ctx *ctx, struct io_mapped_region *mr)
{
if (mr->pages) {
long nr_refs = mr->nr_pages;
if (mr->flags & IO_REGION_F_SINGLE_REF)
nr_refs = 1;
if (mr->flags & IO_REGION_F_USER_PROVIDED)
unpin_user_pages(mr->pages, mr->nr_pages);
unpin_user_pages(mr->pages, nr_refs);
else
release_pages(mr->pages, mr->nr_pages);
release_pages(mr->pages, nr_refs);
kvfree(mr->pages);
}
if ((mr->flags & IO_REGION_F_VMAP) && mr->ptr)