[PATCH v3 04/18] io_uring/memmap: flag regions with user pages

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

In preparation to kernel allocated regions add a flag telling if
the region contains user pinned pages or not.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
---
 io_uring/memmap.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/io_uring/memmap.c b/io_uring/memmap.c
index 31fb8c8ffe4e..a0416733e921 100644
--- a/io_uring/memmap.c
+++ b/io_uring/memmap.c
@@ -205,12 +205,17 @@ void *__io_uaddr_map(struct page ***pages, unsigned short *npages,
 enum {
 	/* memory was vmap'ed for the kernel, freeing the region vunmap's it */
 	IO_REGION_F_VMAP			= 1,
+	/* memory is provided by user and pinned by the kernel */
+	IO_REGION_F_USER_PROVIDED		= 2,
 };
 
 void io_free_region(struct io_ring_ctx *ctx, struct io_mapped_region *mr)
 {
 	if (mr->pages) {
-		unpin_user_pages(mr->pages, mr->nr_pages);
+		if (mr->flags & IO_REGION_F_USER_PROVIDED)
+			unpin_user_pages(mr->pages, mr->nr_pages);
+		else
+			release_pages(mr->pages, mr->nr_pages);
 		kvfree(mr->pages);
 	}
 	if ((mr->flags & IO_REGION_F_VMAP) && mr->ptr)
@@ -267,7 +272,7 @@ int io_create_region(struct io_ring_ctx *ctx, struct io_mapped_region *mr,
 	mr->pages = pages;
 	mr->ptr = vptr;
 	mr->nr_pages = nr_pages;
-	mr->flags |= IO_REGION_F_VMAP;
+	mr->flags |= IO_REGION_F_VMAP | IO_REGION_F_USER_PROVIDED;
 	return 0;
 out_free:
 	if (pages_accounted)
-- 
2.47.1