netdev - [PATCH rdma-next v4 03/17] RDMA/restrack: Add an API to attach a task to a resource

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Message-Id: <20190618172625.13432-4-leon@kernel.org>
Date:   Tue, 18 Jun 2019 20:26:11 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Doug Ledford <dledford@...hat.com>,
        Jason Gunthorpe <jgg@...lanox.com>
Cc:     Leon Romanovsky <leonro@...lanox.com>,
        RDMA mailing list <linux-rdma@...r.kernel.org>,
        Majd Dibbiny <majd@...lanox.com>,
        Mark Zhang <markz@...lanox.com>,
        Saeed Mahameed <saeedm@...lanox.com>,
        linux-netdev <netdev@...r.kernel.org>
Subject: [PATCH rdma-next v4 03/17] RDMA/restrack: Add an API to attach a task to a resource

From: Mark Zhang <markz@...lanox.com>

Add rdma_restrack_attach_task() which is able to attach a task
other then "current" to a resource.

Signed-off-by: Mark Zhang <markz@...lanox.com>
Reviewed-by: Majd Dibbiny <majd@...lanox.com>
Signed-off-by: Leon Romanovsky <leonro@...lanox.com>
---
 drivers/infiniband/core/restrack.c | 14 ++++++++++++++
 drivers/infiniband/core/restrack.h |  2 ++
 2 files changed, 16 insertions(+)

diff --git a/drivers/infiniband/core/restrack.c b/drivers/infiniband/core/restrack.c
index 95573f292aae..3714634ae296 100644
--- a/drivers/infiniband/core/restrack.c
+++ b/drivers/infiniband/core/restrack.c
@@ -194,6 +194,20 @@ void rdma_restrack_set_task(struct rdma_restrack_entry *res,
 }
 EXPORT_SYMBOL(rdma_restrack_set_task);

+/**
+ * rdma_restrack_attach_task() - attach the task onto this resource
+ * @res:  resource entry
+ * @task: the task to attach, the current task will be used if it is NULL.
+ */
+void rdma_restrack_attach_task(struct rdma_restrack_entry *res,
+			       struct task_struct *task)
+{
+	if (res->task)
+		put_task_struct(res->task);
+	get_task_struct(task);
+	res->task = task;
+}
+
 static void rdma_restrack_add(struct rdma_restrack_entry *res)
 {
 	struct ib_device *dev = res_to_dev(res);
diff --git a/drivers/infiniband/core/restrack.h b/drivers/infiniband/core/restrack.h
index 09a1fbdf578e..d084e5f89849 100644
--- a/drivers/infiniband/core/restrack.h
+++ b/drivers/infiniband/core/restrack.h
@@ -25,4 +25,6 @@ struct rdma_restrack_root {

 int rdma_restrack_init(struct ib_device *dev);
 void rdma_restrack_clean(struct ib_device *dev);
+void rdma_restrack_attach_task(struct rdma_restrack_entry *res,
+			       struct task_struct *task);
 #endif /* _RDMA_CORE_RESTRACK_H_ */
--
2.20.1