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path: root/drivers/md/dm.c
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Diffstat (limited to 'drivers/md/dm.c')
-rw-r--r--drivers/md/dm.c123
1 files changed, 75 insertions, 48 deletions
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 697f34fba..0d7ab20c5 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -86,6 +86,9 @@ struct dm_rq_target_io {
struct kthread_work work;
int error;
union map_info info;
+ struct dm_stats_aux stats_aux;
+ unsigned long duration_jiffies;
+ unsigned n_sectors;
};
/*
@@ -1046,6 +1049,17 @@ static struct dm_rq_target_io *tio_from_request(struct request *rq)
return (rq->q->mq_ops ? blk_mq_rq_to_pdu(rq) : rq->special);
}
+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);
+ }
+}
+
/*
* Don't touch any member of the md after calling this function because
* the md may be freed in dm_put() at the end of this function.
@@ -1127,6 +1141,7 @@ static void dm_end_request(struct request *clone, int error)
}
free_rq_clone(clone);
+ rq_end_stats(md, rq);
if (!rq->q->mq_ops)
blk_end_request_all(rq, error);
else
@@ -1162,13 +1177,14 @@ static void old_requeue_request(struct request *rq)
spin_unlock_irqrestore(q->queue_lock, flags);
}
-static void dm_requeue_unmapped_original_request(struct mapped_device *md,
- struct request *rq)
+static void dm_requeue_original_request(struct mapped_device *md,
+ struct request *rq)
{
int rw = rq_data_dir(rq);
dm_unprep_request(rq);
+ rq_end_stats(md, rq);
if (!rq->q->mq_ops)
old_requeue_request(rq);
else {
@@ -1179,13 +1195,6 @@ static void dm_requeue_unmapped_original_request(struct mapped_device *md,
rq_completed(md, rw, false);
}
-static void dm_requeue_unmapped_request(struct request *clone)
-{
- struct dm_rq_target_io *tio = clone->end_io_data;
-
- dm_requeue_unmapped_original_request(tio->md, tio->orig);
-}
-
static void old_stop_queue(struct request_queue *q)
{
unsigned long flags;
@@ -1249,7 +1258,7 @@ static void dm_done(struct request *clone, int error, bool mapped)
return;
else if (r == DM_ENDIO_REQUEUE)
/* The target wants to requeue the I/O */
- dm_requeue_unmapped_request(clone);
+ dm_requeue_original_request(tio->md, tio->orig);
else {
DMWARN("unimplemented target endio return value: %d", r);
BUG();
@@ -1267,6 +1276,7 @@ static void dm_softirq_done(struct request *rq)
int rw;
if (!clone) {
+ rq_end_stats(tio->md, rq);
rw = rq_data_dir(rq);
if (!rq->q->mq_ops) {
blk_end_request_all(rq, tio->error);
@@ -1987,7 +1997,7 @@ static int map_request(struct dm_rq_target_io *tio, struct request *rq,
break;
case DM_MAPIO_REQUEUE:
/* The target wants to requeue the I/O */
- dm_requeue_unmapped_request(clone);
+ dm_requeue_original_request(md, tio->orig);
break;
default:
if (r > 0) {
@@ -2010,7 +2020,7 @@ static void map_tio_request(struct kthread_work *work)
struct mapped_device *md = tio->md;
if (map_request(tio, rq, md) == DM_MAPIO_REQUEUE)
- dm_requeue_unmapped_original_request(md, rq);
+ dm_requeue_original_request(md, rq);
}
static void dm_start_request(struct mapped_device *md, struct request *orig)
@@ -2027,6 +2037,14 @@ static void dm_start_request(struct mapped_device *md, struct request *orig)
md->last_rq_start_time = ktime_get();
}
+ if (unlikely(dm_stats_used(&md->stats))) {
+ 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);
+ }
+
/*
* Hold the md reference here for the in-flight I/O.
* We can't rely on the reference count by device opener,
@@ -2157,7 +2175,7 @@ static int dm_any_congested(void *congested_data, int bdi_bits)
* the query about congestion status of request_queue
*/
if (dm_request_based(md))
- r = md->queue->backing_dev_info.state &
+ r = md->queue->backing_dev_info.wb.state &
bdi_bits;
else
r = dm_table_any_congested(map, bdi_bits);
@@ -2250,6 +2268,40 @@ static void dm_init_old_md_queue(struct mapped_device *md)
blk_queue_bounce_limit(md->queue, BLK_BOUNCE_ANY);
}
+static void cleanup_mapped_device(struct mapped_device *md)
+{
+ if (md->wq)
+ destroy_workqueue(md->wq);
+ if (md->kworker_task)
+ kthread_stop(md->kworker_task);
+ if (md->io_pool)
+ mempool_destroy(md->io_pool);
+ if (md->rq_pool)
+ mempool_destroy(md->rq_pool);
+ if (md->bs)
+ bioset_free(md->bs);
+
+ cleanup_srcu_struct(&md->io_barrier);
+
+ if (md->disk) {
+ spin_lock(&_minor_lock);
+ md->disk->private_data = NULL;
+ spin_unlock(&_minor_lock);
+ if (blk_get_integrity(md->disk))
+ blk_integrity_unregister(md->disk);
+ del_gendisk(md->disk);
+ put_disk(md->disk);
+ }
+
+ if (md->queue)
+ blk_cleanup_queue(md->queue);
+
+ if (md->bdev) {
+ bdput(md->bdev);
+ md->bdev = NULL;
+ }
+}
+
/*
* Allocate and initialise a blank device with a given minor.
*/
@@ -2295,13 +2347,13 @@ static struct mapped_device *alloc_dev(int minor)
md->queue = blk_alloc_queue(GFP_KERNEL);
if (!md->queue)
- goto bad_queue;
+ goto bad;
dm_init_md_queue(md);
md->disk = alloc_disk(1);
if (!md->disk)
- goto bad_disk;
+ goto bad;
atomic_set(&md->pending[0], 0);
atomic_set(&md->pending[1], 0);
@@ -2322,11 +2374,11 @@ static struct mapped_device *alloc_dev(int minor)
md->wq = alloc_workqueue("kdmflush", WQ_MEM_RECLAIM, 0);
if (!md->wq)
- goto bad_thread;
+ goto bad;
md->bdev = bdget_disk(md->disk, 0);
if (!md->bdev)
- goto bad_bdev;
+ goto bad;
bio_init(&md->flush_bio);
md->flush_bio.bi_bdev = md->bdev;
@@ -2343,15 +2395,8 @@ static struct mapped_device *alloc_dev(int minor)
return md;
-bad_bdev:
- destroy_workqueue(md->wq);
-bad_thread:
- del_gendisk(md->disk);
- put_disk(md->disk);
-bad_disk:
- blk_cleanup_queue(md->queue);
-bad_queue:
- cleanup_srcu_struct(&md->io_barrier);
+bad:
+ cleanup_mapped_device(md);
bad_io_barrier:
free_minor(minor);
bad_minor:
@@ -2368,32 +2413,13 @@ static void free_dev(struct mapped_device *md)
int minor = MINOR(disk_devt(md->disk));
unlock_fs(md);
- destroy_workqueue(md->wq);
- if (md->kworker_task)
- kthread_stop(md->kworker_task);
- if (md->io_pool)
- mempool_destroy(md->io_pool);
- if (md->rq_pool)
- mempool_destroy(md->rq_pool);
- if (md->bs)
- bioset_free(md->bs);
+ cleanup_mapped_device(md);
+ if (md->use_blk_mq)
+ blk_mq_free_tag_set(&md->tag_set);
- cleanup_srcu_struct(&md->io_barrier);
free_table_devices(&md->table_devices);
dm_stats_cleanup(&md->stats);
-
- spin_lock(&_minor_lock);
- md->disk->private_data = NULL;
- spin_unlock(&_minor_lock);
- if (blk_get_integrity(md->disk))
- blk_integrity_unregister(md->disk);
- del_gendisk(md->disk);
- put_disk(md->disk);
- blk_cleanup_queue(md->queue);
- if (md->use_blk_mq)
- blk_mq_free_tag_set(&md->tag_set);
- bdput(md->bdev);
free_minor(minor);
module_put(THIS_MODULE);
@@ -2754,6 +2780,7 @@ static int dm_mq_queue_rq(struct blk_mq_hw_ctx *hctx,
/* Direct call is fine since .queue_rq allows allocations */
if (map_request(tio, rq, md) == DM_MAPIO_REQUEUE) {
/* Undo dm_start_request() before requeuing */
+ rq_end_stats(md, rq);
rq_completed(md, rq_data_dir(rq), false);
return BLK_MQ_RQ_QUEUE_BUSY;
}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-20 12:00:15 +0000