mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-31 16:38:12 +00:00
c6a564ffad
These macros are just used by a few files. Move them out of genhd.h, which is included everywhere into a new standalone header. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
115 lines
3.2 KiB
C
115 lines
3.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _LINUX_PART_STAT_H
|
|
#define _LINUX_PART_STAT_H
|
|
|
|
#include <linux/genhd.h>
|
|
|
|
/*
|
|
* 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.
|
|
*
|
|
* part_stat_{add|set_all}() and {init|free}_part_stats are for
|
|
* internal use only.
|
|
*/
|
|
#ifdef CONFIG_SMP
|
|
#define part_stat_lock() ({ rcu_read_lock(); get_cpu(); })
|
|
#define part_stat_unlock() do { put_cpu(); rcu_read_unlock(); } while (0)
|
|
|
|
#define part_stat_get_cpu(part, field, cpu) \
|
|
(per_cpu_ptr((part)->dkstats, (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)->dkstats->field) res = 0; \
|
|
unsigned int _cpu; \
|
|
for_each_possible_cpu(_cpu) \
|
|
res += per_cpu_ptr((part)->dkstats, _cpu)->field; \
|
|
res; \
|
|
})
|
|
|
|
static inline void part_stat_set_all(struct hd_struct *part, int value)
|
|
{
|
|
int i;
|
|
|
|
for_each_possible_cpu(i)
|
|
memset(per_cpu_ptr(part->dkstats, i), value,
|
|
sizeof(struct disk_stats));
|
|
}
|
|
|
|
static inline int init_part_stats(struct hd_struct *part)
|
|
{
|
|
part->dkstats = alloc_percpu(struct disk_stats);
|
|
if (!part->dkstats)
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
static inline void free_part_stats(struct hd_struct *part)
|
|
{
|
|
free_percpu(part->dkstats);
|
|
}
|
|
|
|
#else /* !CONFIG_SMP */
|
|
#define part_stat_lock() ({ rcu_read_lock(); 0; })
|
|
#define part_stat_unlock() rcu_read_unlock()
|
|
|
|
#define part_stat_get(part, field) ((part)->dkstats.field)
|
|
#define part_stat_get_cpu(part, field, cpu) part_stat_get(part, field)
|
|
#define part_stat_read(part, field) part_stat_get(part, field)
|
|
|
|
static inline void part_stat_set_all(struct hd_struct *part, int value)
|
|
{
|
|
memset(&part->dkstats, value, sizeof(struct disk_stats));
|
|
}
|
|
|
|
static inline int init_part_stats(struct hd_struct *part)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
static inline void free_part_stats(struct hd_struct *part)
|
|
{
|
|
}
|
|
|
|
#endif /* CONFIG_SMP */
|
|
|
|
#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) \
|
|
(part_stat_get(part, field) += (addnd))
|
|
|
|
#define part_stat_add(part, field, addnd) do { \
|
|
__part_stat_add((part), field, addnd); \
|
|
if ((part)->partno) \
|
|
__part_stat_add(&part_to_disk((part))->part0, \
|
|
field, addnd); \
|
|
} while (0)
|
|
|
|
#define part_stat_dec(gendiskp, field) \
|
|
part_stat_add(gendiskp, field, -1)
|
|
#define part_stat_inc(gendiskp, field) \
|
|
part_stat_add(gendiskp, field, 1)
|
|
#define part_stat_sub(gendiskp, field, subnd) \
|
|
part_stat_add(gendiskp, field, -subnd)
|
|
|
|
#define part_stat_local_dec(gendiskp, field) \
|
|
local_dec(&(part_stat_get(gendiskp, field)))
|
|
#define part_stat_local_inc(gendiskp, field) \
|
|
local_inc(&(part_stat_get(gendiskp, field)))
|
|
#define part_stat_local_read(gendiskp, field) \
|
|
local_read(&(part_stat_get(gendiskp, field)))
|
|
#define part_stat_local_read_cpu(gendiskp, field, cpu) \
|
|
local_read(&(part_stat_get_cpu(gendiskp, field, cpu)))
|
|
|
|
#endif /* _LINUX_PART_STAT_H */
|