The old dm_request() method used for q->make_request_fn had a branch for
request-based DM support but it isn't needed given that
dm_init_request_based_queue() sets it to the standard blk_queue_bio()
anyway.
Cleanup dm_init_md_queue() to be DM device-type agnostic and have
dm_setup_md_queue() properly finish queue setup based on DM device-type
(bio-based vs request-based).
Also, remove the export for blk_queue_bio() now that DM no longer calls
it directly. Doing so required a forward declaration in blk-core.c.
Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx>
---
block/blk-core.c | 5 +++--
drivers/md/dm.c | 29 ++++++++++++-----------------
include/linux/blkdev.h | 2 --
3 files changed, 15 insertions(+), 21 deletions(-)
diff --git a/block/blk-core.c b/block/blk-core.c
index 794c3e7..4bcd739 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -719,6 +719,8 @@ blk_init_queue_node(request_fn_proc *rfn, spinlock_t *lock, int node_id)
}
EXPORT_SYMBOL(blk_init_queue_node);
+static void blk_queue_bio(struct request_queue *q, struct bio *bio);
+
struct request_queue *
blk_init_allocated_queue(struct request_queue *q, request_fn_proc *rfn,
spinlock_t *lock)
@@ -1563,7 +1565,7 @@ void init_request_from_bio(struct request *req, struct bio *bio)
blk_rq_bio_prep(req->q, req, bio);
}
-void blk_queue_bio(struct request_queue *q, struct bio *bio)
+static void blk_queue_bio(struct request_queue *q, struct bio *bio)
{
const bool sync = !!(bio->bi_rw & REQ_SYNC);
struct blk_plug *plug;
@@ -1671,7 +1673,6 @@ out_unlock:
spin_unlock_irq(q->queue_lock);
}
}
-EXPORT_SYMBOL_GPL(blk_queue_bio); /* for device mapper only */
/*
* If bio->bi_dev is a partition, remap the location
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index fcc3203..6a85bd4 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1690,7 +1690,7 @@ out:
* The request function that just remaps the bio built up by
* dm_merge_bvec.
*/
-static void _dm_request(struct request_queue *q, struct bio *bio)
+static void dm_make_request(struct request_queue *q, struct bio *bio)
{
int rw = bio_data_dir(bio);
struct mapped_device *md = q->queuedata;
@@ -1722,16 +1722,6 @@ int dm_request_based(struct mapped_device *md)
return blk_queue_stackable(md->queue);
}
-static void dm_request(struct request_queue *q, struct bio *bio)
-{
- struct mapped_device *md = q->queuedata;
-
- if (dm_request_based(md))
- blk_queue_bio(q, bio);
- else
- _dm_request(q, bio);
-}
-
static void dm_dispatch_clone_request(struct request *clone, struct request *rq)
{
int r;
@@ -2097,9 +2087,8 @@ static void dm_init_md_queue(struct mapped_device *md)
md->queue->queuedata = md;
md->queue->backing_dev_info.congested_fn = dm_any_congested;
md->queue->backing_dev_info.congested_data = md;
- blk_queue_make_request(md->queue, dm_request);
+
blk_queue_bounce_limit(md->queue, BLK_BOUNCE_ANY);
- blk_queue_merge_bvec(md->queue, dm_merge_bvec);
}
/*
@@ -2330,7 +2319,7 @@ int dm_queue_merge_is_compulsory(struct request_queue *q)
if (!q->merge_bvec_fn)
return 0;
- if (q->make_request_fn == dm_request) {
+ if (q->make_request_fn == dm_make_request) {
dev_md = q->queuedata;
if (test_bit(DMF_MERGE_IS_OPTIONAL, &dev_md->flags))
return 0;
@@ -2540,9 +2529,15 @@ static int dm_init_request_based_queue(struct mapped_device *md)
*/
int dm_setup_md_queue(struct mapped_device *md)
{
- if (dm_md_type_request_based(md) && !dm_init_request_based_queue(md)) {
- DMWARN("Cannot initialize queue for request-based mapped device");
- return -EINVAL;
+ if (dm_md_type_request_based(md)) {
+ if (!dm_init_request_based_queue(md)) {
+ DMWARN("Cannot initialize queue for request-based mapped device");
+ return -EINVAL;
+ }
+ } else {
+ /* bio-based specific initialization */
+ blk_queue_make_request(md->queue, dm_make_request);
+ blk_queue_merge_bvec(md->queue, dm_merge_bvec);
}
return 0;
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 7f9a516..5d93a66 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -821,8 +821,6 @@ extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t,
extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t,
struct scsi_ioctl_command __user *);
-extern void blk_queue_bio(struct request_queue *q, struct bio *bio);
-
/*
* A queue has just exitted congestion. Note this in the global counter of
* congested queues, and wake up anyone who was waiting for requests to be
--
1.9.3 (Apple Git-50)
--
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