[PATCH 6/8] io_uring: add nr_ctx to record the number of ctx in a task

[Hao Xu <haoxu@xxxxxxxxxxxxxxxxx>]

This is used in the next patch for task_work batch optimization.

Signed-off-by: Hao Xu <haoxu@xxxxxxxxxxxxxxxxx>
---
 fs/io_uring.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index db5d9189df3a..7c6d90d693b8 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -470,6 +470,7 @@ struct io_uring_task {
 	struct io_wq_work_list	prior_task_list;
 	struct callback_head	task_work;
 	bool			task_running;
+	unsigned int		nr_ctx;
 };
 
 /*
@@ -9655,6 +9656,9 @@ static int __io_uring_add_tctx_node(struct io_ring_ctx *ctx)
 		mutex_lock(&ctx->uring_lock);
 		list_add(&node->ctx_node, &ctx->tctx_list);
 		mutex_unlock(&ctx->uring_lock);
+		spin_lock_irq(&tctx->task_lock);
+		tctx->nr_ctx++;
+		spin_unlock_irq(&tctx->task_lock);
 	}
 	tctx->last = ctx;
 	return 0;
@@ -9692,6 +9696,9 @@ static __cold void io_uring_del_tctx_node(unsigned long index)
 	mutex_lock(&node->ctx->uring_lock);
 	list_del(&node->ctx_node);
 	mutex_unlock(&node->ctx->uring_lock);
+	spin_lock_irq(&tctx->task_lock);
+	tctx->nr_ctx--;
+	spin_unlock_irq(&tctx->task_lock);
 
 	if (tctx->last == node->ctx)
 		tctx->last = NULL;
-- 
2.24.4