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Date: Mon, 10 Jan 2022 17:10:36 +0800
From: Wang Jianchao <jianchao.wan9@...il.com>
To: axboe@...nel.dk
Cc: jbacik@...com, tj@...nel.org, bvanassche@....org,
linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 03/13] blk: export following interfaces
From: Wang Jianchao <wangjianchao@...ishou.com>
This is a preparation for making blk-rq-qos policyies modular,
there is no functional change.
Signed-off-by: Wang Jianchao <wangjianchao@...ishou.com>
---
block/bdev.c | 5 -----
block/blk-cgroup.c | 12 ++++++++++++
block/blk-mq-debugfs.c | 2 ++
block/blk-rq-qos.c | 2 ++
block/blk-stat.c | 30 ------------------------------
block/blk-stat.h | 31 ++++++++++++++++++++++++++++---
include/linux/blk-cgroup.h | 1 +
include/linux/blkdev.h | 5 ++++-
8 files changed, 49 insertions(+), 39 deletions(-)
diff --git a/block/bdev.c b/block/bdev.c
index b1d087e5e205..35d8c71be741 100644
--- a/block/bdev.c
+++ b/block/bdev.c
@@ -761,11 +761,6 @@ struct block_device *blkdev_get_no_open(dev_t dev)
return bdev;
}
-void blkdev_put_no_open(struct block_device *bdev)
-{
- put_device(&bdev->bd_device);
-}
-
/**
* blkdev_get_by_dev - open a block device by device number
* @dev: device number of block device to open
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 663aabfeba18..fb56d74f1c8e 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -55,10 +55,18 @@ static struct blkcg_policy *blkcg_policy[BLKCG_MAX_POLS];
static LIST_HEAD(all_blkcgs); /* protected by blkcg_pol_mutex */
bool blkcg_debug_stats = false;
+EXPORT_SYMBOL_GPL(blkcg_debug_stats);
+
static struct workqueue_struct *blkcg_punt_bio_wq;
#define BLKG_DESTROY_BATCH_SIZE 64
+bool blkcg_debug_stats_enabled(void)
+{
+ return blkcg_debug_stats;
+}
+EXPORT_SYMBOL_GPL(blkcg_debug_stats_enabled);
+
static bool blkcg_policy_enabled(struct request_queue *q,
const struct blkcg_policy *pol)
{
@@ -494,6 +502,7 @@ const char *blkg_dev_name(struct blkcg_gq *blkg)
return NULL;
return bdi_dev_name(blkg->q->disk->bdi);
}
+EXPORT_SYMBOL_GPL(blkg_dev_name);
/**
* blkcg_print_blkgs - helper for printing per-blkg data
@@ -606,6 +615,7 @@ struct block_device *blkcg_conf_open_bdev(char **inputp)
*inputp = input;
return bdev;
}
+EXPORT_SYMBOL_GPL(blkcg_conf_open_bdev);
/**
* blkg_conf_prep - parse and prepare for per-blkg config update
@@ -1778,6 +1788,7 @@ void blkcg_schedule_throttle(struct request_queue *q, bool use_memdelay)
current->use_memdelay = use_memdelay;
set_notify_resume(current);
}
+EXPORT_SYMBOL_GPL(blkcg_schedule_throttle);
/**
* blkcg_add_delay - add delay to this blkg
@@ -1795,6 +1806,7 @@ void blkcg_add_delay(struct blkcg_gq *blkg, u64 now, u64 delta)
blkcg_scale_delay(blkg, now);
atomic64_add(delta, &blkg->delay_nsec);
}
+EXPORT_SYMBOL_GPL(blkcg_add_delay);
/**
* blkg_tryget_closest - try and get a blkg ref on the closet blkg
diff --git a/block/blk-mq-debugfs.c b/block/blk-mq-debugfs.c
index e225db3c271f..9c786b63c847 100644
--- a/block/blk-mq-debugfs.c
+++ b/block/blk-mq-debugfs.c
@@ -835,6 +835,7 @@ void blk_mq_debugfs_unregister_rqos(struct rq_qos *rqos)
debugfs_remove_recursive(rqos->debugfs_dir);
rqos->debugfs_dir = NULL;
}
+EXPORT_SYMBOL_GPL(blk_mq_debugfs_unregister_rqos);
void blk_mq_debugfs_register_rqos(struct rq_qos *rqos)
{
@@ -855,6 +856,7 @@ void blk_mq_debugfs_register_rqos(struct rq_qos *rqos)
debugfs_create_files(rqos->debugfs_dir, rqos, rqos->ops->debugfs_attrs);
}
+EXPORT_SYMBOL_GPL(blk_mq_debugfs_register_rqos);
void blk_mq_debugfs_unregister_queue_rqos(struct request_queue *q)
{
diff --git a/block/blk-rq-qos.c b/block/blk-rq-qos.c
index a94ff872722b..08ccd4a4e913 100644
--- a/block/blk-rq-qos.c
+++ b/block/blk-rq-qos.c
@@ -33,6 +33,7 @@ bool rq_wait_inc_below(struct rq_wait *rq_wait, unsigned int limit)
{
return atomic_inc_below(&rq_wait->inflight, limit);
}
+EXPORT_SYMBOL_GPL(rq_wait_inc_below);
void __rq_qos_cleanup(struct rq_qos *rqos, struct bio *bio)
{
@@ -296,6 +297,7 @@ void rq_qos_wait(struct rq_wait *rqw, void *private_data,
} while (1);
finish_wait(&rqw->wait, &data.wq);
}
+EXPORT_SYMBOL_GPL(rq_qos_wait);
void rq_qos_exit(struct request_queue *q)
{
diff --git a/block/blk-stat.c b/block/blk-stat.c
index ae3dd1fb8e61..2b0c530b0c9c 100644
--- a/block/blk-stat.c
+++ b/block/blk-stat.c
@@ -18,36 +18,6 @@ struct blk_queue_stats {
bool enable_accounting;
};
-void blk_rq_stat_init(struct blk_rq_stat *stat)
-{
- stat->min = -1ULL;
- stat->max = stat->nr_samples = stat->mean = 0;
- stat->batch = 0;
-}
-
-/* src is a per-cpu stat, mean isn't initialized */
-void blk_rq_stat_sum(struct blk_rq_stat *dst, struct blk_rq_stat *src)
-{
- if (!src->nr_samples)
- return;
-
- dst->min = min(dst->min, src->min);
- dst->max = max(dst->max, src->max);
-
- dst->mean = div_u64(src->batch + dst->mean * dst->nr_samples,
- dst->nr_samples + src->nr_samples);
-
- dst->nr_samples += src->nr_samples;
-}
-
-void blk_rq_stat_add(struct blk_rq_stat *stat, u64 value)
-{
- stat->min = min(stat->min, value);
- stat->max = max(stat->max, value);
- stat->batch += value;
- stat->nr_samples++;
-}
-
void blk_stat_add(struct request *rq, u64 now)
{
struct request_queue *q = rq->q;
diff --git a/block/blk-stat.h b/block/blk-stat.h
index 17b47a86eefb..2642969594d8 100644
--- a/block/blk-stat.h
+++ b/block/blk-stat.h
@@ -164,8 +164,33 @@ static inline void blk_stat_activate_msecs(struct blk_stat_callback *cb,
mod_timer(&cb->timer, jiffies + msecs_to_jiffies(msecs));
}
-void blk_rq_stat_add(struct blk_rq_stat *, u64);
-void blk_rq_stat_sum(struct blk_rq_stat *, struct blk_rq_stat *);
-void blk_rq_stat_init(struct blk_rq_stat *);
+static inline void blk_rq_stat_init(struct blk_rq_stat *stat)
+{
+ stat->min = -1ULL;
+ stat->max = stat->nr_samples = stat->mean = 0;
+ stat->batch = 0;
+}
+
+/* src is a per-cpu stat, mean isn't initialized */
+static inline void blk_rq_stat_sum(struct blk_rq_stat *dst, struct blk_rq_stat *src)
+{
+ if (!src->nr_samples)
+ return;
+
+ dst->min = min(dst->min, src->min);
+ dst->max = max(dst->max, src->max);
+ dst->mean = div_u64(src->batch + dst->mean * dst->nr_samples,
+ dst->nr_samples + src->nr_samples);
+
+ dst->nr_samples += src->nr_samples;
+}
+
+static inline void blk_rq_stat_add(struct blk_rq_stat *stat, u64 value)
+{
+ stat->min = min(stat->min, value);
+ stat->max = max(stat->max, value);
+ stat->batch += value;
+ stat->nr_samples++;
+}
#endif
diff --git a/include/linux/blk-cgroup.h b/include/linux/blk-cgroup.h
index b4de2010fba5..b87a1bdde675 100644
--- a/include/linux/blk-cgroup.h
+++ b/include/linux/blk-cgroup.h
@@ -179,6 +179,7 @@ struct blkcg_policy {
extern struct blkcg blkcg_root;
extern struct cgroup_subsys_state * const blkcg_root_css;
extern bool blkcg_debug_stats;
+bool blkcg_debug_stats_enabled(void);
struct blkcg_gq *blkg_lookup_slowpath(struct blkcg *blkcg,
struct request_queue *q, bool update_hint);
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index e7dce2232814..ed30b3c3fee7 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -1297,7 +1297,10 @@ void blkdev_put(struct block_device *bdev, fmode_t mode);
/* just for blk-cgroup, don't use elsewhere */
struct block_device *blkdev_get_no_open(dev_t dev);
-void blkdev_put_no_open(struct block_device *bdev);
+static inline void blkdev_put_no_open(struct block_device *bdev)
+{
+ put_device(&bdev->bd_device);
+}
struct block_device *bdev_alloc(struct gendisk *disk, u8 partno);
void bdev_add(struct block_device *bdev, dev_t dev);
--
2.17.1
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