https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: 830b3c68c1fb1e9176028d02ef86f3cf76aa2476 authored by Linus Torvalds on 11 December 2022, 22:15:18 UTC
Linux 6.1
Linux 6.1
Tip revision: 830b3c6
dm-io-tracker.h
/*
* 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