[PATCH] Remove blkdev warning triggered by using md.

Neil Brown
2008-05-13T01:05:41Z

As setting and clearing queue flags now requires that we hold a
spinlock on the queue, and as blk_queue_stack_limits is called without
that lock, get the lock inside blk_queue_stack_limits.

For blk_queue_stack_limits to be able to find the right lock, each md
personality needs to set q->queue_lock to point to the appropriate
lock. Those personalities which didn't previously use a spin_lock,
us q->__queue_lock. So always initialise that lock when allocated.

With this in place, setting/clearing of the QUEUE_FLAG_PLUGGED bit
will no longer cause warnings as it will be clear that the proper
lock is held.

Thanks to Dan Williams for review and fixing the silly bugs.

Signed-off-by: NeilBrown <neilb@suse.de>

--
diffstat output
---------------
block/blk-core.c | 5 ++---
block/blk-settings.c | 8 +++++++-
drivers/md/linear.c | 1 +
drivers/md/multipath.c | 1 +
drivers/md/raid0.c | 1 +
drivers/md/raid1.c | 4 +++-
drivers/md/raid10.c | 4 +++-
drivers/md/raid5.c | 1 +
8 files changed, 19 insertions(+), 6 deletions(-)

diff --git a/block/blk-core.c b/block/blk-core.c
index 2987fe4..6a9cc0d 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -482,6 +482,7 @@ struct request_queue *blk_alloc_queue_node(gfp_t gfp_mask, int node_id)
kobject_init(&q->kobj, &blk_queue_ktype);

mutex_init(&q->sysfs_lock);
+ spin_lock_init(&q->__queue_lock);

return q;
}
@@ -544,10 +545,8 @@ blk_init_queue_node(request_fn_proc *rfn, spinlock_t *lock, int node_id)
* if caller didn't supply a lock, they get per-queue locking with
* our embedded lock
*/
- if (!lock) {
- spin_lock_init(&q->__queue_lock);
+ if (!lock)
lock = &q->__queue_lock;
- }

q->request_fn = rfn;
q->prep_rq_fn = NULL;
diff --git a/block/blk-settings.c b/block/blk-settings.c
index bb93d4c..8dd8641 100644
--- a/block/blk-settings.c
+++ b/block/blk-settings.c
@@ -286,8 +286,14 @@ void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b)
t->max_hw_segments = min(t->max_hw_segments, b->max_hw_segments);
t->max_segment_size = min(t->max_segment_size, b->max_segment_size);
t->hardsect_size = max(t->hardsect_size, b->hardsect_size);
- if (!test_bit(QUEUE_FLAG_CLUSTER, &b->queue_flags))
+ if (!t->queue_lock)
+ WARN_ON_ONCE(1);
+ else if (!test_bit(QUEUE_FLAG_CLUSTER, &b->queue_flags)) {
+ unsigned long flags;
+ spin_lock_irqsave(t->queue_lock, flags);
queue_flag_clear(QUEUE_FLAG_CLUSTER, t);
+ spin_unlock_irqrestore(t->queue_lock, flags);
+ }
}
EXPORT_SYMBOL(blk_queue_stack_limits);

diff --git a/drivers/md/linear.c b/drivers/md/linear.c
index 0b85117..1074824 100644
--- a/drivers/md/linear.c
+++ b/drivers/md/linear.c
@@ -250,6 +250,7 @@ static int linear_run (mddev_t *mddev)
{
linear_conf_t *conf;

+ mddev->queue->queue_lock = &mddev->queue->__queue_lock;
conf = linear_conf(mddev, mddev->raid_disks);

if (!conf)
diff --git a/drivers/md/multipath.c b/drivers/md/multipath.c
index 42ee1a2..4f4d1f3 100644
--- a/drivers/md/multipath.c
+++ b/drivers/md/multipath.c
@@ -417,6 +417,7 @@ static int multipath_run (mddev_t *mddev)
* bookkeeping area. [whatever we allocate in multipath_run(),
* should be freed in multipath_stop()]
*/
+ mddev->queue->queue_lock = &mddev->queue->__queue_lock;

conf = kzalloc(sizeof(multipath_conf_t), GFP_KERNEL);
mddev->private = conf;
diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c
index 818b482..914c04d 100644
--- a/drivers/md/raid0.c
+++ b/drivers/md/raid0.c
@@ -280,6 +280,7 @@ static int raid0_run (mddev_t *mddev)
(mddev->chunk_size>>1)-1);
blk_queue_max_sectors(mddev->queue, mddev->chunk_size >> 9);
blk_queue_segment_boundary(mddev->queue, (mddev->chunk_size>>1) - 1);
+ mddev->queue->queue_lock = &mddev->queue->__queue_lock;

conf = kmalloc(sizeof (raid0_conf_t), GFP_KERNEL);
if (!conf)
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 6778b7c..ac409b7 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -1935,6 +1935,9 @@ static int run(mddev_t *mddev)
if (!conf->r1bio_pool)
goto out_no_mem;

+ spin_lock_init(&conf->device_lock);
+ mddev->queue->queue_lock = &conf->device_lock;
+
rdev_for_each(rdev, tmp, mddev) {
disk_idx = rdev->raid_disk;
if (disk_idx >= mddev->raid_disks
@@ -1958,7 +1961,6 @@ static int run(mddev_t *mddev)
}
conf->raid_disks = mddev->raid_disks;
conf->mddev = mddev;
- spin_lock_init(&conf->device_lock);
INIT_LIST_HEAD(&conf->retry_list);

spin_lock_init(&conf->resync_lock);
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index faf3d89..8536ede 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -2082,6 +2082,9 @@ static int run(mddev_t *mddev)
goto out_free_conf;
}

+ spin_lock_init(&conf->device_lock);
+ mddev->queue->queue_lock = &conf->device_lock;
+
rdev_for_each(rdev, tmp, mddev) {
disk_idx = rdev->raid_disk;
if (disk_idx >= mddev->raid_disks
@@ -2103,7 +2106,6 @@ static int run(mddev_t *mddev)

disk->head_position = 0;
}
- spin_lock_init(&conf->device_lock);
INIT_LIST_HEAD(&conf->retry_list);

spin_lock_init(&conf->resync_lock);
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 087eee0..4fafc79 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -4256,6 +4256,7 @@ static int run(mddev_t *mddev)
goto abort;
}
spin_lock_init(&conf->device_lock);
+ mddev->queue->queue_lock = &conf->device_lock;
init_waitqueue_head(&conf->wait_for_stripe);
init_waitqueue_head(&conf->wait_for_overlap);
INIT_LIST_HEAD(&conf->handle_list);