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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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116 lines
3.2 KiB
C
116 lines
3.2 KiB
C
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/* 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/genhd.h>
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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
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* and should be called between disk_stat_lock() and
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* 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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* part_stat_{add|set_all}() and {init|free}_part_stats are for
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* internal use only.
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*/
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#ifdef CONFIG_SMP
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#define part_stat_lock() ({ rcu_read_lock(); get_cpu(); })
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#define part_stat_unlock() do { put_cpu(); rcu_read_unlock(); } while (0)
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#define part_stat_get_cpu(part, field, cpu) \
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(per_cpu_ptr((part)->dkstats, (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((part)->dkstats->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)->dkstats, _cpu)->field; \
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res; \
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})
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static inline void part_stat_set_all(struct hd_struct *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->dkstats, i), value,
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sizeof(struct disk_stats));
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}
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static inline int init_part_stats(struct hd_struct *part)
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{
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part->dkstats = alloc_percpu(struct disk_stats);
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if (!part->dkstats)
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return 0;
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return 1;
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}
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static inline void free_part_stats(struct hd_struct *part)
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{
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free_percpu(part->dkstats);
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}
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#else /* !CONFIG_SMP */
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#define part_stat_lock() ({ rcu_read_lock(); 0; })
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#define part_stat_unlock() rcu_read_unlock()
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#define part_stat_get(part, field) ((part)->dkstats.field)
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#define part_stat_get_cpu(part, field, cpu) part_stat_get(part, field)
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#define part_stat_read(part, field) part_stat_get(part, field)
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static inline void part_stat_set_all(struct hd_struct *part, int value)
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{
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memset(&part->dkstats, value, sizeof(struct disk_stats));
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}
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static inline int init_part_stats(struct hd_struct *part)
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{
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return 1;
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}
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static inline void free_part_stats(struct hd_struct *part)
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{
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}
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#endif /* CONFIG_SMP */
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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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(part_stat_get(part, 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 ((part)->partno) \
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__part_stat_add(&part_to_disk((part))->part0, \
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field, addnd); \
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} while (0)
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#define part_stat_dec(gendiskp, field) \
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part_stat_add(gendiskp, field, -1)
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#define part_stat_inc(gendiskp, field) \
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part_stat_add(gendiskp, field, 1)
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#define part_stat_sub(gendiskp, field, subnd) \
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part_stat_add(gendiskp, field, -subnd)
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#define part_stat_local_dec(gendiskp, field) \
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local_dec(&(part_stat_get(gendiskp, field)))
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#define part_stat_local_inc(gendiskp, field) \
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local_inc(&(part_stat_get(gendiskp, field)))
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#define part_stat_local_read(gendiskp, field) \
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local_read(&(part_stat_get(gendiskp, field)))
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#define part_stat_local_read_cpu(gendiskp, field, cpu) \
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local_read(&(part_stat_get_cpu(gendiskp, field, cpu)))
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#endif /* _LINUX_PART_STAT_H */
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