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authorOmar Sandoval <osandov@fb.com>2018-05-09 02:08:48 -0700
committerJens Axboe <axboe@kernel.dk>2018-05-09 08:33:02 -0600
commita8a45941706bca05ef9234a17f5e4a50b9835a44 (patch)
tree35fad1c22dfb1d2dc6be6641953db03d5a5cb874
parent934031a12980511c020acf7d91f9035e34d0b5b8 (diff)
downloadlinux-0-day-a8a45941706bca05ef9234a17f5e4a50b9835a44.tar.gz
block: pass struct request instead of struct blk_issue_stat to wbt
issue_stat is going to go away, so first make writeback throttling take the containing request, update the internal wbt helpers accordingly, and change rwb->sync_cookie to be the request pointer instead of the issue_stat pointer. No functional change. Signed-off-by: Omar Sandoval <osandov@fb.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
-rw-r--r--block/blk-core.c10
-rw-r--r--block/blk-mq.c10
-rw-r--r--block/blk-wbt.c53
-rw-r--r--block/blk-wbt.h18
4 files changed, 45 insertions, 46 deletions
diff --git a/block/blk-core.c b/block/blk-core.c
index 0573f92..fe2f457 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1659,7 +1659,7 @@ void blk_requeue_request(struct request_queue *q, struct request *rq)
blk_delete_timer(rq);
blk_clear_rq_complete(rq);
trace_block_rq_requeue(q, rq);
- wbt_requeue(q->rq_wb, &rq->issue_stat);
+ wbt_requeue(q->rq_wb, rq);
if (rq->rq_flags & RQF_QUEUED)
blk_queue_end_tag(q, rq);
@@ -1766,7 +1766,7 @@ void __blk_put_request(struct request_queue *q, struct request *req)
/* this is a bio leak */
WARN_ON(req->bio != NULL);
- wbt_done(q->rq_wb, &req->issue_stat);
+ wbt_done(q->rq_wb, req);
/*
* Request may not have originated from ll_rw_blk. if not,
@@ -2077,7 +2077,7 @@ get_rq:
goto out_unlock;
}
- wbt_track(&req->issue_stat, wb_acct);
+ wbt_track(req, wb_acct);
/*
* After dropping the lock and possibly sleeping here, our request
@@ -2993,7 +2993,7 @@ void blk_start_request(struct request *req)
if (test_bit(QUEUE_FLAG_STATS, &req->q->queue_flags)) {
blk_stat_set_issue(&req->issue_stat, blk_rq_sectors(req));
req->rq_flags |= RQF_STATS;
- wbt_issue(req->q->rq_wb, &req->issue_stat);
+ wbt_issue(req->q->rq_wb, req);
}
BUG_ON(blk_rq_is_complete(req));
@@ -3212,7 +3212,7 @@ void blk_finish_request(struct request *req, blk_status_t error)
blk_account_io_done(req);
if (req->end_io) {
- wbt_done(req->q->rq_wb, &req->issue_stat);
+ wbt_done(req->q->rq_wb, req);
req->end_io(req, error);
} else {
if (blk_bidi_rq(req))
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 9ce9cac..deb85b5 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -488,7 +488,7 @@ void blk_mq_free_request(struct request *rq)
if (unlikely(laptop_mode && !blk_rq_is_passthrough(rq)))
laptop_io_completion(q->backing_dev_info);
- wbt_done(q->rq_wb, &rq->issue_stat);
+ wbt_done(q->rq_wb, rq);
if (blk_rq_rl(rq))
blk_put_rl(blk_rq_rl(rq));
@@ -508,7 +508,7 @@ inline void __blk_mq_end_request(struct request *rq, blk_status_t error)
blk_account_io_done(rq);
if (rq->end_io) {
- wbt_done(rq->q->rq_wb, &rq->issue_stat);
+ wbt_done(rq->q->rq_wb, rq);
rq->end_io(rq, error);
} else {
if (unlikely(blk_bidi_rq(rq)))
@@ -671,7 +671,7 @@ void blk_mq_start_request(struct request *rq)
if (test_bit(QUEUE_FLAG_STATS, &q->queue_flags)) {
blk_stat_set_issue(&rq->issue_stat, blk_rq_sectors(rq));
rq->rq_flags |= RQF_STATS;
- wbt_issue(q->rq_wb, &rq->issue_stat);
+ wbt_issue(q->rq_wb, rq);
}
WARN_ON_ONCE(blk_mq_rq_state(rq) != MQ_RQ_IDLE);
@@ -719,7 +719,7 @@ static void __blk_mq_requeue_request(struct request *rq)
blk_mq_put_driver_tag(rq);
trace_block_rq_requeue(q, rq);
- wbt_requeue(q->rq_wb, &rq->issue_stat);
+ wbt_requeue(q->rq_wb, rq);
if (blk_mq_rq_state(rq) != MQ_RQ_IDLE) {
blk_mq_rq_update_state(rq, MQ_RQ_IDLE);
@@ -1882,7 +1882,7 @@ static blk_qc_t blk_mq_make_request(struct request_queue *q, struct bio *bio)
return BLK_QC_T_NONE;
}
- wbt_track(&rq->issue_stat, wb_acct);
+ wbt_track(rq, wb_acct);
cookie = request_to_qc_t(data.hctx, rq);
diff --git a/block/blk-wbt.c b/block/blk-wbt.c
index 450cffa..592e914 100644
--- a/block/blk-wbt.c
+++ b/block/blk-wbt.c
@@ -29,24 +29,24 @@
#define CREATE_TRACE_POINTS
#include <trace/events/wbt.h>
-static inline void wbt_clear_state(struct blk_issue_stat *stat)
+static inline void wbt_clear_state(struct request *rq)
{
- stat->stat &= ~BLK_STAT_RES_MASK;
+ rq->issue_stat.stat &= ~BLK_STAT_RES_MASK;
}
-static inline enum wbt_flags wbt_stat_to_mask(struct blk_issue_stat *stat)
+static inline enum wbt_flags wbt_flags(struct request *rq)
{
- return (stat->stat & BLK_STAT_RES_MASK) >> BLK_STAT_RES_SHIFT;
+ return (rq->issue_stat.stat & BLK_STAT_RES_MASK) >> BLK_STAT_RES_SHIFT;
}
-static inline bool wbt_is_tracked(struct blk_issue_stat *stat)
+static inline bool wbt_is_tracked(struct request *rq)
{
- return (stat->stat >> BLK_STAT_RES_SHIFT) & WBT_TRACKED;
+ return (rq->issue_stat.stat >> BLK_STAT_RES_SHIFT) & WBT_TRACKED;
}
-static inline bool wbt_is_read(struct blk_issue_stat *stat)
+static inline bool wbt_is_read(struct request *rq)
{
- return (stat->stat >> BLK_STAT_RES_SHIFT) & WBT_READ;
+ return (rq->issue_stat.stat >> BLK_STAT_RES_SHIFT) & WBT_READ;
}
enum {
@@ -194,24 +194,24 @@ void __wbt_done(struct rq_wb *rwb, enum wbt_flags wb_acct)
* Called on completion of a request. Note that it's also called when
* a request is merged, when the request gets freed.
*/
-void wbt_done(struct rq_wb *rwb, struct blk_issue_stat *stat)
+void wbt_done(struct rq_wb *rwb, struct request *rq)
{
if (!rwb)
return;
- if (!wbt_is_tracked(stat)) {
- if (rwb->sync_cookie == stat) {
+ if (!wbt_is_tracked(rq)) {
+ if (rwb->sync_cookie == rq) {
rwb->sync_issue = 0;
rwb->sync_cookie = NULL;
}
- if (wbt_is_read(stat))
+ if (wbt_is_read(rq))
wb_timestamp(rwb, &rwb->last_comp);
} else {
- WARN_ON_ONCE(stat == rwb->sync_cookie);
- __wbt_done(rwb, wbt_stat_to_mask(stat));
+ WARN_ON_ONCE(rq == rwb->sync_cookie);
+ __wbt_done(rwb, wbt_flags(rq));
}
- wbt_clear_state(stat);
+ wbt_clear_state(rq);
}
/*
@@ -643,30 +643,29 @@ enum wbt_flags wbt_wait(struct rq_wb *rwb, struct bio *bio, spinlock_t *lock)
return ret | WBT_TRACKED;
}
-void wbt_issue(struct rq_wb *rwb, struct blk_issue_stat *stat)
+void wbt_issue(struct rq_wb *rwb, struct request *rq)
{
if (!rwb_enabled(rwb))
return;
/*
- * Track sync issue, in case it takes a long time to complete. Allows
- * us to react quicker, if a sync IO takes a long time to complete.
- * Note that this is just a hint. 'stat' can go away when the
- * request completes, so it's important we never dereference it. We
- * only use the address to compare with, which is why we store the
- * sync_issue time locally.
+ * Track sync issue, in case it takes a long time to complete. Allows us
+ * to react quicker, if a sync IO takes a long time to complete. Note
+ * that this is just a hint. The request can go away when it completes,
+ * so it's important we never dereference it. We only use the address to
+ * compare with, which is why we store the sync_issue time locally.
*/
- if (wbt_is_read(stat) && !rwb->sync_issue) {
- rwb->sync_cookie = stat;
- rwb->sync_issue = blk_stat_time(stat);
+ if (wbt_is_read(rq) && !rwb->sync_issue) {
+ rwb->sync_cookie = rq;
+ rwb->sync_issue = blk_stat_time(&rq->issue_stat);
}
}
-void wbt_requeue(struct rq_wb *rwb, struct blk_issue_stat *stat)
+void wbt_requeue(struct rq_wb *rwb, struct request *rq)
{
if (!rwb_enabled(rwb))
return;
- if (stat == rwb->sync_cookie) {
+ if (rq == rwb->sync_cookie) {
rwb->sync_issue = 0;
rwb->sync_cookie = NULL;
}
diff --git a/block/blk-wbt.h b/block/blk-wbt.h
index 5bdae20..85fbccc 100644
--- a/block/blk-wbt.h
+++ b/block/blk-wbt.h
@@ -88,19 +88,19 @@ static inline unsigned int wbt_inflight(struct rq_wb *rwb)
#ifdef CONFIG_BLK_WBT
-static inline void wbt_track(struct blk_issue_stat *stat, enum wbt_flags flags)
+static inline void wbt_track(struct request *rq, enum wbt_flags flags)
{
- stat->stat |= ((u64)flags) << BLK_STAT_RES_SHIFT;
+ rq->issue_stat.stat |= ((u64)flags) << BLK_STAT_RES_SHIFT;
}
void __wbt_done(struct rq_wb *, enum wbt_flags);
-void wbt_done(struct rq_wb *, struct blk_issue_stat *);
+void wbt_done(struct rq_wb *, struct request *);
enum wbt_flags wbt_wait(struct rq_wb *, struct bio *, spinlock_t *);
int wbt_init(struct request_queue *);
void wbt_exit(struct request_queue *);
void wbt_update_limits(struct rq_wb *);
-void wbt_requeue(struct rq_wb *, struct blk_issue_stat *);
-void wbt_issue(struct rq_wb *, struct blk_issue_stat *);
+void wbt_requeue(struct rq_wb *, struct request *);
+void wbt_issue(struct rq_wb *, struct request *);
void wbt_disable_default(struct request_queue *);
void wbt_enable_default(struct request_queue *);
@@ -111,13 +111,13 @@ u64 wbt_default_latency_nsec(struct request_queue *);
#else
-static inline void wbt_track(struct blk_issue_stat *stat, enum wbt_flags flags)
+static inline void wbt_track(struct request *rq, enum wbt_flags flags)
{
}
static inline void __wbt_done(struct rq_wb *rwb, enum wbt_flags flags)
{
}
-static inline void wbt_done(struct rq_wb *rwb, struct blk_issue_stat *stat)
+static inline void wbt_done(struct rq_wb *rwb, struct request *rq)
{
}
static inline enum wbt_flags wbt_wait(struct rq_wb *rwb, struct bio *bio,
@@ -135,10 +135,10 @@ static inline void wbt_exit(struct request_queue *q)
static inline void wbt_update_limits(struct rq_wb *rwb)
{
}
-static inline void wbt_requeue(struct rq_wb *rwb, struct blk_issue_stat *stat)
+static inline void wbt_requeue(struct rq_wb *rwb, struct request *rq)
{
}
-static inline void wbt_issue(struct rq_wb *rwb, struct blk_issue_stat *stat)
+static inline void wbt_issue(struct rq_wb *rwb, struct request *rq)
{
}
static inline void wbt_disable_default(struct request_queue *q)