From: Pavel Begunkov <asml.silence@gmail.com>
Date: Wed, 9 Jun 2021 14:26:54 +0000 (+0100)
Subject: io_uring: enable shmem/memfd memory registration
X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=40dad765c045ab6dbd481cc4f00d04953e77510c;p=uclinux-h8%2Flinux.git

io_uring: enable shmem/memfd memory registration

Relax buffer registration restictions, which filters out file backed
memory, and allow shmem/memfd as they have normal anonymous pages
underneath.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---

diff --git a/fs/io_uring.c b/fs/io_uring.c
index c42a2f3b7259..b93fa32172af 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -8306,6 +8306,8 @@ static int io_sqe_buffer_register(struct io_ring_ctx *ctx, struct iovec *iov,
 		for (i = 0; i < nr_pages; i++) {
 			struct vm_area_struct *vma = vmas[i];
 
+			if (vma_is_shmem(vma))
+				continue;
 			if (vma->vm_file &&
 			    !is_file_hugepages(vma->vm_file)) {
 				ret = -EOPNOTSUPP;