[RFC PATCH v3 1/3] io-uring/cmd: add iou_vec field for io_uring_cmd

[Sidong Yang <sidong.yang@furiosa.ai>]

This patch adds iou_vec field for io_uring_cmd. Also it needs to be
cleanup for cache. It could be used in uring cmd api that imports
multiple fixed buffers.

Signed-off-by: Sidong Yang <sidong.yang@furiosa.ai>
---
 include/linux/io_uring/cmd.h |  1 +
 io_uring/io_uring.c          |  2 +-
 io_uring/opdef.c             |  1 +
 io_uring/uring_cmd.c         | 20 ++++++++++++++++++++
 io_uring/uring_cmd.h         |  3 +++
 5 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/include/linux/io_uring/cmd.h b/include/linux/io_uring/cmd.h
index 598cacda4aa3..74b9f0aec229 100644
--- a/include/linux/io_uring/cmd.h
+++ b/include/linux/io_uring/cmd.h
@@ -22,6 +22,7 @@ struct io_uring_cmd {
 struct io_uring_cmd_data {
 	void			*op_data;
 	struct io_uring_sqe	sqes[2];
+	struct iou_vec		iou_vec;
 };
 
 static inline const void *io_uring_sqe_cmd(const struct io_uring_sqe *sqe)
diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index 5ff30a7092ed..55334fa53abf 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -289,7 +289,7 @@ static void io_free_alloc_caches(struct io_ring_ctx *ctx)
 	io_alloc_cache_free(&ctx->apoll_cache, kfree);
 	io_alloc_cache_free(&ctx->netmsg_cache, io_netmsg_cache_free);
 	io_alloc_cache_free(&ctx->rw_cache, io_rw_cache_free);
-	io_alloc_cache_free(&ctx->uring_cache, kfree);
+	io_alloc_cache_free(&ctx->uring_cache, io_cmd_cache_free);
 	io_alloc_cache_free(&ctx->msg_cache, kfree);
 	io_futex_cache_free(ctx);
 	io_rsrc_cache_free(ctx);
diff --git a/io_uring/opdef.c b/io_uring/opdef.c
index 7fd173197b1e..e275180c2077 100644
--- a/io_uring/opdef.c
+++ b/io_uring/opdef.c
@@ -755,6 +755,7 @@ const struct io_cold_def io_cold_defs[] = {
 	},
 	[IORING_OP_URING_CMD] = {
 		.name			= "URING_CMD",
+		.cleanup		= io_uring_cmd_cleanup,
 	},
 	[IORING_OP_SEND_ZC] = {
 		.name			= "SEND_ZC",
diff --git a/io_uring/uring_cmd.c b/io_uring/uring_cmd.c
index de39b602aa82..315c603cfdd4 100644
--- a/io_uring/uring_cmd.c
+++ b/io_uring/uring_cmd.c
@@ -28,6 +28,13 @@ static void io_req_uring_cleanup(struct io_kiocb *req, unsigned int issue_flags)
 
 	if (issue_flags & IO_URING_F_UNLOCKED)
 		return;
+
+	req->flags &= ~REQ_F_NEED_CLEANUP;
+
+	io_alloc_cache_vec_kasan(&cache->iou_vec);
+	if (cache->iou_vec.nr > IO_VEC_CACHE_SOFT_CAP)
+		io_vec_free(&cache->iou_vec);
+
 	if (io_alloc_cache_put(&req->ctx->uring_cache, cache)) {
 		ioucmd->sqe = NULL;
 		req->async_data = NULL;
@@ -35,6 +42,11 @@ static void io_req_uring_cleanup(struct io_kiocb *req, unsigned int issue_flags)
 	}
 }
 
+void io_uring_cmd_cleanup(struct io_kiocb *req)
+{
+	io_req_uring_cleanup(req, 0);
+}
+
 bool io_uring_try_cancel_uring_cmd(struct io_ring_ctx *ctx,
 				   struct io_uring_task *tctx, bool cancel_all)
 {
@@ -339,3 +351,11 @@ int io_uring_cmd_sock(struct io_uring_cmd *cmd, unsigned int issue_flags)
 }
 EXPORT_SYMBOL_GPL(io_uring_cmd_sock);
 #endif
+
+void io_cmd_cache_free(const void *entry)
+{
+	struct io_uring_cmd_data *cache = (struct io_uring_cmd_data *)entry;
+
+	io_vec_free(&cache->iou_vec);
+	kfree(cache);
+}
diff --git a/io_uring/uring_cmd.h b/io_uring/uring_cmd.h
index f6837ee0955b..d2b9c1522e22 100644
--- a/io_uring/uring_cmd.h
+++ b/io_uring/uring_cmd.h
@@ -1,7 +1,10 @@
 // SPDX-License-Identifier: GPL-2.0
+#include <linux/io_uring_types.h>
 
 int io_uring_cmd(struct io_kiocb *req, unsigned int issue_flags);
 int io_uring_cmd_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
+void io_uring_cmd_cleanup(struct io_kiocb *req);
 
 bool io_uring_try_cancel_uring_cmd(struct io_ring_ctx *ctx,
 				   struct io_uring_task *tctx, bool cancel_all);
+void io_cmd_cache_free(const void *entry);
-- 
2.43.0