4.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: "tang.junhui" <tang.junhui@xxxxxxxxxx>
[ Upstream commit c157313791a999646901b3e3c6888514ebc36d62 ]
Currently, Cache missed IOs are identified by s->cache_miss, but actually,
there are many situations that missed IOs are not assigned a value for
s->cache_miss in cached_dev_cache_miss(), for example, a bypassed IO
(s->iop.bypass = 1), or the cache_bio allocate failed. In these situations,
it will go to out_put or out_submit, and s->cache_miss is null, which leads
bch_mark_cache_accounting() to treat this IO as a hit IO.
[ML: applied by 3-way merge]
Signed-off-by: tang.junhui <tang.junhui@xxxxxxxxxx>
Reviewed-by: Michael Lyle <mlyle@xxxxxxxx>
Reviewed-by: Coly Li <colyli@xxxxxxx>
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/md/bcache/request.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
--- a/drivers/md/bcache/request.c
+++ b/drivers/md/bcache/request.c
@@ -468,6 +468,7 @@ struct search {
unsigned recoverable:1;
unsigned write:1;
unsigned read_dirty_data:1;
+ unsigned cache_missed:1;
unsigned long start_time;
@@ -653,6 +654,7 @@ static inline struct search *search_allo
s->orig_bio = bio;
s->cache_miss = NULL;
+ s->cache_missed = 0;
s->d = d;
s->recoverable = 1;
s->write = (bio->bi_rw & REQ_WRITE) != 0;
@@ -776,7 +778,7 @@ static void cached_dev_read_done_bh(stru
struct cached_dev *dc = container_of(s->d, struct cached_dev, disk);
bch_mark_cache_accounting(s->iop.c, s->d,
- !s->cache_miss, s->iop.bypass);
+ !s->cache_missed, s->iop.bypass);
trace_bcache_read(s->orig_bio, !s->cache_miss, s->iop.bypass);
if (s->iop.error)
@@ -795,6 +797,8 @@ static int cached_dev_cache_miss(struct
struct cached_dev *dc = container_of(s->d, struct cached_dev, disk);
struct bio *miss, *cache_bio;
+ s->cache_missed = 1;
+
if (s->cache_miss || s->iop.bypass) {
miss = bio_next_split(bio, sectors, GFP_NOIO, s->d->bio_split);
ret = miss == bio ? MAP_DONE : MAP_CONTINUE;