linux-ext4 - [RFC PATCH v2 16/19] RDMA/uverbs: Add back pointer to system file object

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Date:   Fri,  9 Aug 2019 15:58:30 -0700
From:   ira.weiny@...el.com
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Jason Gunthorpe <jgg@...pe.ca>,
        Dan Williams <dan.j.williams@...el.com>,
        Matthew Wilcox <willy@...radead.org>, Jan Kara <jack@...e.cz>,
        "Theodore Ts'o" <tytso@....edu>,
        John Hubbard <jhubbard@...dia.com>,
        Michal Hocko <mhocko@...e.com>,
        Dave Chinner <david@...morbit.com>, linux-xfs@...r.kernel.org,
        linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-nvdimm@...ts.01.org,
        linux-ext4@...r.kernel.org, linux-mm@...ck.org,
        Ira Weiny <ira.weiny@...el.com>
Subject: [RFC PATCH v2 16/19] RDMA/uverbs: Add back pointer to system file object

From: Ira Weiny <ira.weiny@...el.com>

In order for MRs to be tracked against the open verbs context the ufile
needs to have a pointer to hand to the GUP code.

No references need to be taken as this should be valid for the lifetime
of the context.

Signed-off-by: Ira Weiny <ira.weiny@...el.com>
---
 drivers/infiniband/core/uverbs.h      | 1 +
 drivers/infiniband/core/uverbs_main.c | 1 +
 2 files changed, 2 insertions(+)

diff --git a/drivers/infiniband/core/uverbs.h b/drivers/infiniband/core/uverbs.h
index 1e5aeb39f774..e802ba8c67d6 100644
--- a/drivers/infiniband/core/uverbs.h
+++ b/drivers/infiniband/core/uverbs.h
@@ -163,6 +163,7 @@ struct ib_uverbs_file {
 	struct page *disassociate_page;
 
 	struct xarray		idr;
+	struct file             *sys_file; /* backpointer to system file object */
 };
 
 struct ib_uverbs_event {
diff --git a/drivers/infiniband/core/uverbs_main.c b/drivers/infiniband/core/uverbs_main.c
index 11c13c1381cf..002c24e0d4db 100644
--- a/drivers/infiniband/core/uverbs_main.c
+++ b/drivers/infiniband/core/uverbs_main.c
@@ -1092,6 +1092,7 @@ static int ib_uverbs_open(struct inode *inode, struct file *filp)
 	INIT_LIST_HEAD(&file->umaps);
 
 	filp->private_data = file;
+	file->sys_file = filp;
 	list_add_tail(&file->list, &dev->uverbs_file_list);
 	mutex_unlock(&dev->lists_mutex);
 	srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
-- 
2.20.1