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 c42a2f3b725965cbb93c4517783c17f76280c531..b93fa32172af9c5ecf6cb637e0464126e3da1b9c 100644 (file)
--- 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;