[PATCH 2/4] io_uring: deduplicate node tagging

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

Move tag handling into io_sqe_buffer_register() so that we don't need to
duplicate it.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
---
 io_uring/rsrc.c | 29 ++++++++++-------------------
 1 file changed, 10 insertions(+), 19 deletions(-)

diff --git a/io_uring/rsrc.c b/io_uring/rsrc.c
index 3c6e6e396052..d5e29536466c 100644
--- a/io_uring/rsrc.c
+++ b/io_uring/rsrc.c
@@ -27,7 +27,7 @@ struct io_rsrc_update {
 };
 
 static struct io_rsrc_node *io_sqe_buffer_register(struct io_ring_ctx *ctx,
-			struct iovec *iov, struct page **last_hpage);
+			struct iovec *iov, struct page **last_hpage, u64 tag);
 
 /* only define max */
 #define IORING_MAX_FIXED_FILES	(1U << 20)
@@ -311,18 +311,11 @@ static int __io_sqe_buffers_update(struct io_ring_ctx *ctx,
 		err = io_buffer_validate(iov);
 		if (err)
 			break;
-		node = io_sqe_buffer_register(ctx, iov, &last_hpage);
+		node = io_sqe_buffer_register(ctx, iov, &last_hpage, tag);
 		if (IS_ERR(node)) {
 			err = PTR_ERR(node);
 			break;
 		}
-		if (tag) {
-			if (!node) {
-				err = -EINVAL;
-				break;
-			}
-			node->tag = tag;
-		}
 		i = array_index_nospec(up->offset + done, ctx->buf_table.nr);
 		io_reset_rsrc_node(ctx, &ctx->buf_table, i);
 		ctx->buf_table.nodes[i] = node;
@@ -771,7 +764,8 @@ bool io_check_coalesce_buffer(struct page **page_array, int nr_pages,
 
 static struct io_rsrc_node *io_sqe_buffer_register(struct io_ring_ctx *ctx,
 						   struct iovec *iov,
-						   struct page **last_hpage)
+						   struct page **last_hpage,
+						   u64 tag)
 {
 	struct io_mapped_ubuf *imu = NULL;
 	struct page **pages = NULL;
@@ -782,12 +776,16 @@ static struct io_rsrc_node *io_sqe_buffer_register(struct io_ring_ctx *ctx,
 	struct io_imu_folio_data data;
 	bool coalesced = false;
 
-	if (!iov->iov_base)
+	if (!iov->iov_base) {
+		if (tag)
+			return ERR_PTR(-EINVAL);
 		return NULL;
+	}
 
 	node = io_rsrc_node_alloc(ctx, IORING_RSRC_BUFFER);
 	if (!node)
 		return ERR_PTR(-ENOMEM);
+	node->tag = tag;
 
 	ret = -ENOMEM;
 	pages = io_pin_pages((unsigned long) iov->iov_base, iov->iov_len,
@@ -899,18 +897,11 @@ int io_sqe_buffers_register(struct io_ring_ctx *ctx, void __user *arg,
 			}
 		}
 
-		node = io_sqe_buffer_register(ctx, iov, &last_hpage);
+		node = io_sqe_buffer_register(ctx, iov, &last_hpage, tag);
 		if (IS_ERR(node)) {
 			ret = PTR_ERR(node);
 			break;
 		}
-		if (tag) {
-			if (!node) {
-				ret = -EINVAL;
-				break;
-			}
-			node->tag = tag;
-		}
 		data.nodes[i] = node;
 	}
 
-- 
2.48.1