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- /*
- * Copyright (C) 2021 Red Hat, Inc. All rights reserved.
- *
- * This file is released under the GPL.
- */
- #ifndef DM_IO_TRACKER_H
- #define DM_IO_TRACKER_H
- #include <linux/jiffies.h>
- struct dm_io_tracker {
- spinlock_t lock;
- /*
- * Sectors of in-flight IO.
- */
- sector_t in_flight;
- /*
- * The time, in jiffies, when this device became idle
- * (if it is indeed idle).
- */
- unsigned long idle_time;
- unsigned long last_update_time;
- };
- static inline void dm_iot_init(struct dm_io_tracker *iot)
- {
- spin_lock_init(&iot->lock);
- iot->in_flight = 0ul;
- iot->idle_time = 0ul;
- iot->last_update_time = jiffies;
- }
- static inline bool dm_iot_idle_for(struct dm_io_tracker *iot, unsigned long j)
- {
- bool r = false;
- spin_lock_irq(&iot->lock);
- if (!iot->in_flight)
- r = time_after(jiffies, iot->idle_time + j);
- spin_unlock_irq(&iot->lock);
- return r;
- }
- static inline unsigned long dm_iot_idle_time(struct dm_io_tracker *iot)
- {
- unsigned long r = 0;
- spin_lock_irq(&iot->lock);
- if (!iot->in_flight)
- r = jiffies - iot->idle_time;
- spin_unlock_irq(&iot->lock);
- return r;
- }
- static inline void dm_iot_io_begin(struct dm_io_tracker *iot, sector_t len)
- {
- spin_lock_irq(&iot->lock);
- iot->in_flight += len;
- spin_unlock_irq(&iot->lock);
- }
- static inline void dm_iot_io_end(struct dm_io_tracker *iot, sector_t len)
- {
- unsigned long flags;
- if (!len)
- return;
- spin_lock_irqsave(&iot->lock, flags);
- iot->in_flight -= len;
- if (!iot->in_flight)
- iot->idle_time = jiffies;
- spin_unlock_irqrestore(&iot->lock, flags);
- }
- #endif
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