[PATCH v5 14/16] io_uring/rsrc: add uncloneable regbuf flag

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

It's hard to implement cloning if the internal structure needs to be
mutable and/or relies on other ring resources. In preparation to such
buffer types, add a flag indicating that the buffer can't be cloned. It
might be possible to add cloning in the future for them, but that would
likely need reallocating the structure and reacquiring resources in case
by case manner.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
---
 io_uring/rsrc.c | 5 +++++
 io_uring/rsrc.h | 3 ++-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/io_uring/rsrc.c b/io_uring/rsrc.c
index 406619158fbb..f041b0db77af 100644
--- a/io_uring/rsrc.c
+++ b/io_uring/rsrc.c
@@ -1381,6 +1381,11 @@ static int io_clone_buffers(struct io_ring_ctx *ctx, struct io_ring_ctx *src_ctx
 		if (!src_node) {
 			dst_node = NULL;
 		} else {
+			if (src_node->buf->flags & IO_REGBUF_F_UNCLONEABLE) {
+				io_rsrc_data_free(ctx, &data);
+				return -ENOMEM;
+			}
+
 			dst_node = io_rsrc_node_alloc(ctx, IORING_RSRC_BUFFER);
 			if (!dst_node) {
 				io_rsrc_data_free(ctx, &data);
diff --git a/io_uring/rsrc.h b/io_uring/rsrc.h
index 98ae8ef51009..83aa86e6f320 100644
--- a/io_uring/rsrc.h
+++ b/io_uring/rsrc.h
@@ -29,7 +29,8 @@ enum {
 };
 
 enum {
-	IO_REGBUF_F_KBUF		= 1,
+	IO_REGBUF_F_KBUF		= 1 << 0,
+	IO_REGBUF_F_UNCLONEABLE		= 1 << 1,
 };
 
 struct io_mapped_ubuf {
-- 
2.54.0