Linux lhjmq-records 5.15.0-118-generic #128-Ubuntu SMP Fri Jul 5 09:28:59 UTC 2024 x86_64
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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_PART_STAT_H
#define _LINUX_PART_STAT_H
#include <linux/genhd.h>
#include <asm/local.h>
struct disk_stats {
u64 nsecs[NR_STAT_GROUPS];
unsigned long sectors[NR_STAT_GROUPS];
unsigned long ios[NR_STAT_GROUPS];
unsigned long merges[NR_STAT_GROUPS];
unsigned long io_ticks;
local_t in_flight[2];
};
/*
* Macros to operate on percpu disk statistics:
*
* {disk|part|all}_stat_{add|sub|inc|dec}() modify the stat counters and should
* be called between disk_stat_lock() and disk_stat_unlock().
*
* part_stat_read() can be called at any time.
*/
#define part_stat_lock() preempt_disable()
#define part_stat_unlock() preempt_enable()
#define part_stat_get_cpu(part, field, cpu) \
(per_cpu_ptr((part)->bd_stats, (cpu))->field)
#define part_stat_get(part, field) \
part_stat_get_cpu(part, field, smp_processor_id())
#define part_stat_read(part, field) \
({ \
typeof((part)->bd_stats->field) res = 0; \
unsigned int _cpu; \
for_each_possible_cpu(_cpu) \
res += per_cpu_ptr((part)->bd_stats, _cpu)->field; \
res; \
})
static inline void part_stat_set_all(struct block_device *part, int value)
{
int i;
for_each_possible_cpu(i)
memset(per_cpu_ptr(part->bd_stats, i), value,
sizeof(struct disk_stats));
}
#define part_stat_read_accum(part, field) \
(part_stat_read(part, field[STAT_READ]) + \
part_stat_read(part, field[STAT_WRITE]) + \
part_stat_read(part, field[STAT_DISCARD]))
#define __part_stat_add(part, field, addnd) \
__this_cpu_add((part)->bd_stats->field, addnd)
#define part_stat_add(part, field, addnd) do { \
__part_stat_add((part), field, addnd); \
if ((part)->bd_partno) \
__part_stat_add(bdev_whole(part), field, addnd); \
} while (0)
#define part_stat_dec(part, field) \
part_stat_add(part, field, -1)
#define part_stat_inc(part, field) \
part_stat_add(part, field, 1)
#define part_stat_sub(part, field, subnd) \
part_stat_add(part, field, -subnd)
#define part_stat_local_dec(part, field) \
local_dec(&(part_stat_get(part, field)))
#define part_stat_local_inc(part, field) \
local_inc(&(part_stat_get(part, field)))
#define part_stat_local_read(part, field) \
local_read(&(part_stat_get(part, field)))
#define part_stat_local_read_cpu(part, field, cpu) \
local_read(&(part_stat_get_cpu(part, field, cpu)))
#endif /* _LINUX_PART_STAT_H */
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