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block: Define and use STAT_READ and STAT_WRITE

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Add defines for STAT_READ and STAT_WRITE for indexing the partition
stat entries. This clarifies some fs/ code which has hardcoded 1 for
STAT_WRITE and will make it easier to extend the stats with additional
fields.

tj: Refreshed on top of v4.17.

Signed-off-by: Michael Callahan <michaelcallahan@fb.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Michael Callahan 2018-07-18 04:47:38 -07:00 • committed by Jens Axboe
parent 59767fbd49
commit dbae2c5513
8 changed files with 40 additions and 28 deletions
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13
include/linux/genhd.h
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@ -16,6 +16,7 @@
#include <linux/slab.h>
#include <linux/percpu-refcount.h>
#include <linux/uuid.h>
#include <linux/blk_types.h>
#ifdef CONFIG_BLOCK
@ -82,10 +83,10 @@ struct partition {
} __attribute__((packed));
struct disk_stats {
unsigned long sectors[2]; /* READs and WRITEs */
unsigned long ios[2];
unsigned long merges[2];
unsigned long ticks[2];
unsigned long sectors[NR_STAT_GROUPS];
unsigned long ios[NR_STAT_GROUPS];
unsigned long merges[NR_STAT_GROUPS];
unsigned long ticks[NR_STAT_GROUPS];
unsigned long io_ticks;
unsigned long time_in_queue;
};
@ -354,8 +355,8 @@ 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[0]) + \
part_stat_read(part, field[1]))
(part_stat_read(part, field[STAT_READ]) + \
part_stat_read(part, field[STAT_WRITE]))
#define part_stat_add(cpu, part, field, addnd) do { \
__part_stat_add((cpu), (part), field, addnd); \