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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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f2987c5816
- rename part_in_{flight, flight_rw} to bdev_count_{inflight, inflight_rw}
- export bdev_count_inflight, to fix a problem in mdraid that foreground
IO can be starved by background sync IO in later patches
Link: https://lore.kernel.org/linux-raid/20250506124903.2540268-6-yukuai1@huaweicloud.com
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.de>
85 lines
2.4 KiB
C
85 lines
2.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_PART_STAT_H
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#define _LINUX_PART_STAT_H
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#include <linux/blkdev.h>
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#include <asm/local.h>
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struct disk_stats {
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u64 nsecs[NR_STAT_GROUPS];
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unsigned long sectors[NR_STAT_GROUPS];
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unsigned long ios[NR_STAT_GROUPS];
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unsigned long merges[NR_STAT_GROUPS];
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unsigned long io_ticks;
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local_t in_flight[2];
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};
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/*
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* Macros to operate on percpu disk statistics:
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*
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* {disk|part|all}_stat_{add|sub|inc|dec}() modify the stat counters and should
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* be called between disk_stat_lock() and disk_stat_unlock().
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*
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* part_stat_read() can be called at any time.
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*/
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#define part_stat_lock() preempt_disable()
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#define part_stat_unlock() preempt_enable()
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#define part_stat_get_cpu(part, field, cpu) \
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(per_cpu_ptr((part)->bd_stats, (cpu))->field)
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#define part_stat_get(part, field) \
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part_stat_get_cpu(part, field, smp_processor_id())
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#define part_stat_read(part, field) \
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({ \
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TYPEOF_UNQUAL((part)->bd_stats->field) res = 0; \
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unsigned int _cpu; \
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for_each_possible_cpu(_cpu) \
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res += per_cpu_ptr((part)->bd_stats, _cpu)->field; \
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res; \
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})
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static inline void part_stat_set_all(struct block_device *part, int value)
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{
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int i;
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for_each_possible_cpu(i)
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memset(per_cpu_ptr(part->bd_stats, i), value,
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sizeof(struct disk_stats));
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}
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#define part_stat_read_accum(part, field) \
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(part_stat_read(part, field[STAT_READ]) + \
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part_stat_read(part, field[STAT_WRITE]) + \
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part_stat_read(part, field[STAT_DISCARD]))
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#define __part_stat_add(part, field, addnd) \
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__this_cpu_add((part)->bd_stats->field, addnd)
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#define part_stat_add(part, field, addnd) do { \
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__part_stat_add((part), field, addnd); \
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if (bdev_is_partition(part)) \
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__part_stat_add(bdev_whole(part), field, addnd); \
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} while (0)
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#define part_stat_dec(part, field) \
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part_stat_add(part, field, -1)
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#define part_stat_inc(part, field) \
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part_stat_add(part, field, 1)
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#define part_stat_sub(part, field, subnd) \
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part_stat_add(part, field, -subnd)
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#define part_stat_local_dec(part, field) \
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local_dec(&(part_stat_get(part, field)))
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#define part_stat_local_inc(part, field) \
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local_inc(&(part_stat_get(part, field)))
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#define part_stat_local_read(part, field) \
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local_read(&(part_stat_get(part, field)))
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#define part_stat_local_read_cpu(part, field, cpu) \
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local_read(&(part_stat_get_cpu(part, field, cpu)))
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unsigned int bdev_count_inflight(struct block_device *part);
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#endif /* _LINUX_PART_STAT_H */
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