io_uring: rename "copy buffers" to "clone buffers"

A recent commit added support for copying registered buffers from one
ring to another. But that term is a bit confusing, as no copying of
buffer data is done here. What is being done is simply cloning the
buffer registrations from one ring to another.

Rename it while we still can, so that it's more descriptive. No
functional changes in this patch.

Fixes: 7cc2a6e ("io_uring: add IORING_REGISTER_COPY_BUFFERS method")
Signed-off-by: Jens Axboe <[email protected]>

Author: axboe

include/uapi/linux/io_uring.h

@@ -609,8 +609,8 @@ enum io_uring_register_op {
 
 	IORING_REGISTER_CLOCK			= 29,
 
-	/* copy registered buffers from source ring to current ring */
-	IORING_REGISTER_COPY_BUFFERS		= 30,
+	/* clone registered buffers from source ring to current ring */
+	IORING_REGISTER_CLONE_BUFFERS		= 30,
 
 	/* this goes last */
 	IORING_REGISTER_LAST,
@@ -701,7 +701,7 @@ enum {
 	IORING_REGISTER_SRC_REGISTERED = 1,
 };
 
-struct io_uring_copy_buffers {
+struct io_uring_clone_buffers {
 	__u32	src_fd;
 	__u32	flags;
 	__u32	pad[6];

io_uring/register.c

@@ -542,11 +542,11 @@ static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode,
 			break;
 		ret = io_register_clock(ctx, arg);
 		break;
-	case IORING_REGISTER_COPY_BUFFERS:
+	case IORING_REGISTER_CLONE_BUFFERS:
 		ret = -EINVAL;
 		if (!arg || nr_args != 1)
 			break;
-		ret = io_register_copy_buffers(ctx, arg);
+		ret = io_register_clone_buffers(ctx, arg);
 		break;
 	default:
 		ret = -EINVAL;

io_uring/rsrc.c

@@ -1139,7 +1139,7 @@ int io_import_fixed(int ddir, struct iov_iter *iter,
 	return 0;
 }
 
-static int io_copy_buffers(struct io_ring_ctx *ctx, struct io_ring_ctx *src_ctx)
+static int io_clone_buffers(struct io_ring_ctx *ctx, struct io_ring_ctx *src_ctx)
 {
 	struct io_mapped_ubuf **user_bufs;
 	struct io_rsrc_data *data;
@@ -1203,9 +1203,9 @@ static int io_copy_buffers(struct io_ring_ctx *ctx, struct io_ring_ctx *src_ctx)
  *
  * Since the memory is already accounted once, don't account it again.
  */
-int io_register_copy_buffers(struct io_ring_ctx *ctx, void __user *arg)
+int io_register_clone_buffers(struct io_ring_ctx *ctx, void __user *arg)
 {
-	struct io_uring_copy_buffers buf;
+	struct io_uring_clone_buffers buf;
 	bool registered_src;
 	struct file *file;
 	int ret;
@@ -1223,7 +1223,7 @@ int io_register_copy_buffers(struct io_ring_ctx *ctx, void __user *arg)
 	file = io_uring_register_get_file(buf.src_fd, registered_src);
 	if (IS_ERR(file))
 		return PTR_ERR(file);
-	ret = io_copy_buffers(ctx, file->private_data);
+	ret = io_clone_buffers(ctx, file->private_data);
 	if (!registered_src)
 		fput(file);
 	return ret;

io_uring/rsrc.h

@@ -68,7 +68,7 @@ int io_import_fixed(int ddir, struct iov_iter *iter,
 			   struct io_mapped_ubuf *imu,
 			   u64 buf_addr, size_t len);
 
-int io_register_copy_buffers(struct io_ring_ctx *ctx, void __user *arg);
+int io_register_clone_buffers(struct io_ring_ctx *ctx, void __user *arg);
 void __io_sqe_buffers_unregister(struct io_ring_ctx *ctx);
 int io_sqe_buffers_unregister(struct io_ring_ctx *ctx);
 int io_sqe_buffers_register(struct io_ring_ctx *ctx, void __user *arg,