io_uring/cmd: remove struct io_uring_cmd_data

There are no more users of struct io_uring_cmd_data and its op_data
field. Remove it to shave 8 bytes from struct io_async_cmd and eliminate
a store and load for every uring_cmd.

Signed-off-by: Caleb Sander Mateos <[email protected]>
Acked-by: David Sterba <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jens Axboe <[email protected]>

Author: calebsander

include/linux/io_uring/cmd.h

@@ -21,10 +21,6 @@ struct io_uring_cmd {
 	u8		pdu[32]; /* available inline for free use */
 };
 
-struct io_uring_cmd_data {
-	void			*op_data;
-};
-
 static inline const void *io_uring_sqe_cmd(const struct io_uring_sqe *sqe)
 {
 	return sqe->cmd;
@@ -137,11 +133,6 @@ static inline struct task_struct *io_uring_cmd_get_task(struct io_uring_cmd *cmd
 	return cmd_to_io_kiocb(cmd)->tctx->task;
 }
 
-static inline struct io_uring_cmd_data *io_uring_cmd_get_async_data(struct io_uring_cmd *cmd)
-{
-	return cmd_to_io_kiocb(cmd)->async_data;
-}
-
 /*
  * Return uring_cmd's context reference as its context handle for driver to
  * track per-context resource, such as registered kernel IO buffer

io_uring/uring_cmd.c

@@ -26,12 +26,6 @@ static void io_req_uring_cleanup(struct io_kiocb *req, unsigned int issue_flags)
 {
 	struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
 	struct io_async_cmd *ac = req->async_data;
-	struct io_uring_cmd_data *cache = &ac->data;
-
-	if (cache->op_data) {
-		kfree(cache->op_data);
-		cache->op_data = NULL;
-	}
 
 	if (issue_flags & IO_URING_F_UNLOCKED)
 		return;
@@ -40,7 +34,7 @@ static void io_req_uring_cleanup(struct io_kiocb *req, unsigned int issue_flags)
 	if (ac->vec.nr > IO_VEC_CACHE_SOFT_CAP)
 		io_vec_free(&ac->vec);
 
-	if (io_alloc_cache_put(&req->ctx->cmd_cache, cache)) {
+	if (io_alloc_cache_put(&req->ctx->cmd_cache, ac)) {
 		ioucmd->sqe = NULL;
 		req->async_data = NULL;
 		req->flags &= ~(REQ_F_ASYNC_DATA|REQ_F_NEED_CLEANUP);
@@ -193,9 +187,6 @@ int io_uring_cmd_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 	struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
 	struct io_async_cmd *ac;
 
-	/* see io_uring_cmd_get_async_data() */
-	BUILD_BUG_ON(offsetof(struct io_async_cmd, data) != 0);
-
 	if (sqe->__pad1)
 		return -EINVAL;
 
@@ -211,7 +202,6 @@ int io_uring_cmd_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 	ac = io_uring_alloc_async_data(&req->ctx->cmd_cache, req);
 	if (!ac)
 		return -ENOMEM;
-	ac->data.op_data = NULL;
 	ioucmd->sqe = sqe;
 	return 0;
 }

io_uring/uring_cmd.h

@@ -4,7 +4,6 @@
 #include <linux/io_uring_types.h>
 
 struct io_async_cmd {
-	struct io_uring_cmd_data	data;
 	struct iou_vec			vec;
 	struct io_uring_sqe		sqes[2];
 };