linux-kernel - [PATCH V4 4/7] loop: add __loop_free_idle_workers() for covering freeing workers in clearing FD

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Message-Id: <20210806080302.298297-5-ming.lei@redhat.com>
Date:   Fri,  6 Aug 2021 16:02:59 +0800
From:   Ming Lei <ming.lei@...hat.com>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
        Christoph Hellwig <hch@....de>,
        Dan Schatzberg <schatzberg.dan@...il.com>,
        Ming Lei <ming.lei@...hat.com>
Subject: [PATCH V4 4/7] loop: add __loop_free_idle_workers() for covering freeing workers in clearing FD

Add the helper, so we can remove the duplicated code for freeing all
workers in clearing FD.

Acked-by: Dan Schatzberg <schatzberg.dan@...il.com>
Signed-off-by: Ming Lei <ming.lei@...hat.com>
---
 drivers/block/loop.c | 25 +++++++++++--------------
 1 file changed, 11 insertions(+), 14 deletions(-)

diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 6e65e46553f6..6e5c55d4552b 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -1207,16 +1207,14 @@ static void loop_set_timer(struct loop_device *lo)
 	schedule_delayed_work(&lo->idle_work, LOOP_IDLE_WORKER_TIMEOUT);
 }
 
-static void loop_free_idle_workers(struct work_struct *work)
+static void __loop_free_idle_workers(struct loop_device *lo, bool force)
 {
-	struct loop_device *lo = container_of(work, struct loop_device,
-			idle_work.work);
 	struct loop_worker *pos, *worker;
 
 	spin_lock(&lo->lo_work_lock);
 	list_for_each_entry_safe(worker, pos, &lo->idle_worker_list,
 				idle_list) {
-		if (time_is_after_jiffies(worker->last_ran_at +
+		if (!force && time_is_after_jiffies(worker->last_ran_at +
 						LOOP_IDLE_WORKER_TIMEOUT))
 			break;
 		list_del(&worker->idle_list);
@@ -1229,6 +1227,14 @@ static void loop_free_idle_workers(struct work_struct *work)
 	spin_unlock(&lo->lo_work_lock);
 }
 
+static void loop_free_idle_workers(struct work_struct *work)
+{
+	struct loop_device *lo = container_of(work, struct loop_device,
+			idle_work.work);
+
+	__loop_free_idle_workers(lo, false);
+}
+
 static int loop_configure(struct loop_device *lo, fmode_t mode,
 			  struct block_device *bdev,
 			  const struct loop_config *config)
@@ -1376,7 +1382,6 @@ static int __loop_clr_fd(struct loop_device *lo, bool release)
 	int err = 0;
 	bool partscan = false;
 	int lo_number;
-	struct loop_worker *pos, *worker;
 
 	/*
 	 * Flush loop_configure() and loop_change_fd(). It is acceptable for
@@ -1409,15 +1414,7 @@ static int __loop_clr_fd(struct loop_device *lo, bool release)
 	blk_mq_freeze_queue(lo->lo_queue);
 
 	destroy_workqueue(lo->workqueue);
-	spin_lock(&lo->lo_work_lock);
-	list_for_each_entry_safe(worker, pos, &lo->idle_worker_list,
-				idle_list) {
-		list_del(&worker->idle_list);
-		rb_erase(&worker->rb_node, &lo->worker_tree);
-		css_put(worker->blkcg_css);
-		kfree(worker);
-	}
-	spin_unlock(&lo->lo_work_lock);
+	__loop_free_idle_workers(lo, true);
 	cancel_delayed_work_sync(&lo->idle_work);
 
 	spin_lock_irq(&lo->lo_lock);
-- 
2.31.1