1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * Copyright (C) 2021 Red Hat, Inc. All rights reserved.
5 * This file is released under the GPL.
8 #ifndef DM_IO_TRACKER_H
9 #define DM_IO_TRACKER_H
11 #include <linux/jiffies.h>
13 struct dm_io_tracker {
17 * Sectors of in-flight IO.
22 * The time, in jiffies, when this device became idle
23 * (if it is indeed idle).
25 unsigned long idle_time;
26 unsigned long last_update_time;
29 static inline void dm_iot_init(struct dm_io_tracker *iot)
31 spin_lock_init(&iot->lock);
34 iot->last_update_time = jiffies;
37 static inline bool dm_iot_idle_for(struct dm_io_tracker *iot, unsigned long j)
41 spin_lock_irq(&iot->lock);
43 r = time_after(jiffies, iot->idle_time + j);
44 spin_unlock_irq(&iot->lock);
49 static inline unsigned long dm_iot_idle_time(struct dm_io_tracker *iot)
53 spin_lock_irq(&iot->lock);
55 r = jiffies - iot->idle_time;
56 spin_unlock_irq(&iot->lock);
61 static inline void dm_iot_io_begin(struct dm_io_tracker *iot, sector_t len)
63 spin_lock_irq(&iot->lock);
64 iot->in_flight += len;
65 spin_unlock_irq(&iot->lock);
68 static inline void dm_iot_io_end(struct dm_io_tracker *iot, sector_t len)
75 spin_lock_irqsave(&iot->lock, flags);
76 iot->in_flight -= len;
78 iot->idle_time = jiffies;
79 spin_unlock_irqrestore(&iot->lock, flags);