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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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3
fs/f2fs/super.c
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@@ -2882,7 +2882,8 @@ try_onemore:
/* For write statistics */
if (sb->s_bdev->bd_part)
sbi->sectors_written_start =
(u64)part_stat_read(sb->s_bdev->bd_part, sectors[1]);
(u64)part_stat_read(sb->s_bdev->bd_part,
sectors[STAT_WRITE]);
/* Read accumulated write IO statistics if exists */
seg_i = CURSEG_I(sbi, CURSEG_HOT_NODE);