[PATCH v2 02/10] blktrace: move blktrace debugfs creation to helper function

From: Luis Chamberlain <mcgrof@kernel.org>
To: axboe@kernel.dk, viro@zeniv.linux.org.uk, bvanassche@acm.org,
	gregkh@linuxfoundation.org, rostedt@goodmis.org,
	mingo@redhat.com, jack@suse.cz, ming.lei@redhat.com,
	nstange@suse.de, akpm@linux-foundation.org
Cc: mhocko@suse.com, yukuai3@huawei.com, linux-block@vger.kernel.org,
	linux-fsdevel@vger.kernel.org, linux-mm@kvack.org,
	linux-kernel@vger.kernel.org,
	Luis Chamberlain <mcgrof@kernel.org>
Subject: [PATCH v2 02/10] blktrace: move blktrace debugfs creation to helper function
Date: Sun, 19 Apr 2020 19:45:21 +0000	[thread overview]
Message-ID: <20200419194529.4872-3-mcgrof@kernel.org> (raw)
In-Reply-To: <20200419194529.4872-1-mcgrof@kernel.org>

Move the work to create the debugfs directory used into a helper.
It will make further checks easier to read. This commit introduces
no functional changes.

Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
---
 kernel/trace/blktrace.c | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index ca39dc3230cb..2c6e6c386ace 100644
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -468,6 +468,18 @@ static void blk_trace_setup_lba(struct blk_trace *bt,
 	}
 }
 
+static struct dentry *blk_trace_debugfs_dir(struct blk_user_trace_setup *buts,
+					    struct blk_trace *bt)
+{
+	struct dentry *dir = NULL;
+
+	dir = debugfs_lookup(buts->name, blk_debugfs_root);
+	if (!dir)
+		bt->dir = dir = debugfs_create_dir(buts->name, blk_debugfs_root);
+
+	return dir;
+}
+
 /*
  * Setup everything required to start tracing
  */
@@ -509,9 +521,7 @@ static int do_blk_trace_setup(struct request_queue *q, char *name, dev_t dev,
 
 	ret = -ENOENT;
 
-	dir = debugfs_lookup(buts->name, blk_debugfs_root);
-	if (!dir)
-		bt->dir = dir = debugfs_create_dir(buts->name, blk_debugfs_root);
+	dir = blk_trace_debugfs_dir(buts, bt);
 
 	bt->dev = dev;
 	atomic_set(&bt->dropped, 0);
-- 
2.25.1

