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authorMike Christie <mchristi@redhat.com>2016-06-05 14:32:03 -0500
committerJens Axboe <axboe@fb.com>2016-06-07 13:41:38 -0600
commit528ec5abe6808c367b13f51945829eba24b1fc17 (patch)
treedc1f0ba75f564934b86ed10559e9b17143119c15 /drivers
parent162b99e3119767cb6478c55a5aed70469389df88 (diff)
dm: pass dm stats data dir instead of bi_rw
It looks like dm stats cares about the data direction (READ vs WRITE) and does not need the bio/request flags. Commands like REQ_FLUSH, REQ_DISCARD and REQ_WRITE_SAME are currently always set with REQ_WRITE, so the extra check for REQ_DISCARD in dm_stats_account_io is not needed. This patch has it use the bio and request data_dir helpers instead of accessing the bi_rw/cmd_flags directly. This makes the next patches that remove the operation from the cmd_flags and bi_rw easier, because we will no longer have the REQ_WRITE bit set for operations like discards. Signed-off-by: Mike Christie <mchristi@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Hannes Reinecke <hare@suse.com> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/md/dm-stats.c9
-rw-r--r--drivers/md/dm.c21
2 files changed, 16 insertions, 14 deletions
diff --git a/drivers/md/dm-stats.c b/drivers/md/dm-stats.c
index 8289804ccd99..4fba26cd6bdb 100644
--- a/drivers/md/dm-stats.c
+++ b/drivers/md/dm-stats.c
@@ -514,11 +514,10 @@ static void dm_stat_round(struct dm_stat *s, struct dm_stat_shared *shared,
}
static void dm_stat_for_entry(struct dm_stat *s, size_t entry,
- unsigned long bi_rw, sector_t len,
+ int idx, sector_t len,
struct dm_stats_aux *stats_aux, bool end,
unsigned long duration_jiffies)
{
- unsigned long idx = bi_rw & REQ_WRITE;
struct dm_stat_shared *shared = &s->stat_shared[entry];
struct dm_stat_percpu *p;
@@ -584,7 +583,7 @@ static void dm_stat_for_entry(struct dm_stat *s, size_t entry,
#endif
}
-static void __dm_stat_bio(struct dm_stat *s, unsigned long bi_rw,
+static void __dm_stat_bio(struct dm_stat *s, int bi_rw,
sector_t bi_sector, sector_t end_sector,
bool end, unsigned long duration_jiffies,
struct dm_stats_aux *stats_aux)
@@ -645,8 +644,8 @@ void dm_stats_account_io(struct dm_stats *stats, unsigned long bi_rw,
last = raw_cpu_ptr(stats->last);
stats_aux->merged =
(bi_sector == (ACCESS_ONCE(last->last_sector) &&
- ((bi_rw & (REQ_WRITE | REQ_DISCARD)) ==
- (ACCESS_ONCE(last->last_rw) & (REQ_WRITE | REQ_DISCARD)))
+ ((bi_rw == WRITE) ==
+ (ACCESS_ONCE(last->last_rw) == WRITE))
));
ACCESS_ONCE(last->last_sector) = end_sector;
ACCESS_ONCE(last->last_rw) = bi_rw;
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 1b2f96205361..f5ac0a32cb6c 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -723,8 +723,9 @@ static void start_io_acct(struct dm_io *io)
atomic_inc_return(&md->pending[rw]));
if (unlikely(dm_stats_used(&md->stats)))
- dm_stats_account_io(&md->stats, bio->bi_rw, bio->bi_iter.bi_sector,
- bio_sectors(bio), false, 0, &io->stats_aux);
+ dm_stats_account_io(&md->stats, bio_data_dir(bio),
+ bio->bi_iter.bi_sector, bio_sectors(bio),
+ false, 0, &io->stats_aux);
}
static void end_io_acct(struct dm_io *io)
@@ -738,8 +739,9 @@ static void end_io_acct(struct dm_io *io)
generic_end_io_acct(rw, &dm_disk(md)->part0, io->start_time);
if (unlikely(dm_stats_used(&md->stats)))
- dm_stats_account_io(&md->stats, bio->bi_rw, bio->bi_iter.bi_sector,
- bio_sectors(bio), true, duration, &io->stats_aux);
+ dm_stats_account_io(&md->stats, bio_data_dir(bio),
+ bio->bi_iter.bi_sector, bio_sectors(bio),
+ true, duration, &io->stats_aux);
/*
* After this is decremented the bio must not be touched if it is
@@ -1121,9 +1123,9 @@ static void rq_end_stats(struct mapped_device *md, struct request *orig)
if (unlikely(dm_stats_used(&md->stats))) {
struct dm_rq_target_io *tio = tio_from_request(orig);
tio->duration_jiffies = jiffies - tio->duration_jiffies;
- dm_stats_account_io(&md->stats, orig->cmd_flags, blk_rq_pos(orig),
- tio->n_sectors, true, tio->duration_jiffies,
- &tio->stats_aux);
+ dm_stats_account_io(&md->stats, rq_data_dir(orig),
+ blk_rq_pos(orig), tio->n_sectors, true,
+ tio->duration_jiffies, &tio->stats_aux);
}
}
@@ -2082,8 +2084,9 @@ static void dm_start_request(struct mapped_device *md, struct request *orig)
struct dm_rq_target_io *tio = tio_from_request(orig);
tio->duration_jiffies = jiffies;
tio->n_sectors = blk_rq_sectors(orig);
- dm_stats_account_io(&md->stats, orig->cmd_flags, blk_rq_pos(orig),
- tio->n_sectors, false, 0, &tio->stats_aux);
+ dm_stats_account_io(&md->stats, rq_data_dir(orig),
+ blk_rq_pos(orig), tio->n_sectors, false, 0,
+ &tio->stats_aux);
}
/*