dm: do not initialise full request queue when bio based

Change bio-based mapped devices no longer to have a fully initialized
request_queue (request_fn, elevator, etc).  This means bio-based DM
devices no longer register elevator sysfs attributes ('iosched/' tree
or 'scheduler' other than "none").

In contrast, a request-based DM device will continue to have a full
request_queue and will register elevator sysfs attributes.  Therefore
a user can determine a DM device's type by checking if elevator sysfs
attributes exist.

First allocate a minimalist request_queue structure for a DM device
(needed for both bio and request-based DM).

Initialization of a full request_queue is deferred until it is known
that the DM device is request-based, at the end of the table load
sequence.

Factor DM device's request_queue initialization:
- common to both request-based and bio-based into dm_init_md_queue().
- specific to request-based into dm_init_request_based_queue().

The md->type_lock mutex is used to protect md->queue, in addition to
md->type, during table_load().

A DM device's first table_load will establish the immutable md->type.
But md->queue initialization, based on md->type, may fail at that time
(because blk_init_allocated_queue cannot allocate memory).  Therefore
any subsequent table_load must (re)try dm_setup_md_queue independently of
establishing md->type.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Acked-by: Kiyoshi Ueda <k-ueda@ct.jp.nec.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>

diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c
index 4702f38..ed85859 100644 (file)
--- a/drivers/md/dm-ioctl.c
+++ b/drivers/md/dm-ioctl.c
@@ -1189,7 +1189,7 @@ static int table_load(struct dm_ioctl *param, size_t param_size)
                goto out;
        }
 
-       /* Protect md->type against concurrent table loads. */
+       /* Protect md->type and md->queue against concurrent table loads. */
        dm_lock_md_type(md);
        if (dm_get_md_type(md) == DM_TYPE_NONE)
                /* Initial table load: acquire type of table. */
@@ -1201,6 +1201,15 @@ static int table_load(struct dm_ioctl *param, size_t param_size)
                r = -EINVAL;
                goto out;
        }
+
+       /* setup md->queue to reflect md's type (may block) */
+       r = dm_setup_md_queue(md);
+       if (r) {
+               DMWARN("unable to set up device queue for new table.");
+               dm_table_destroy(t);
+               dm_unlock_md_type(md);
+               goto out;
+       }
        dm_unlock_md_type(md);
 
        /* stage inactive table */

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 345e94c..5ae0a05 100644 (file)
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -126,7 +126,7 @@ struct mapped_device {
 
        struct request_queue *queue;
        unsigned type;
-       /* Protect type against concurrent access. */
+       /* Protect queue and type against concurrent access. */
        struct mutex type_lock;
 
        struct gendisk *disk;
@@ -1856,6 +1856,28 @@ static const struct block_device_operations dm_blk_dops;
 static void dm_wq_work(struct work_struct *work);
 static void dm_rq_barrier_work(struct work_struct *work);
 
+static void dm_init_md_queue(struct mapped_device *md)
+{
+       /*
+        * Request-based dm devices cannot be stacked on top of bio-based dm
+        * devices.  The type of this dm device has not been decided yet.
+        * The type is decided at the first table loading time.
+        * To prevent problematic device stacking, clear the queue flag
+        * for request stacking support until then.
+        *
+        * This queue is new, so no concurrency on the queue_flags.
+        */
+       queue_flag_clear_unlocked(QUEUE_FLAG_STACKABLE, md->queue);
+
+       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);
+       md->queue->unplug_fn = dm_unplug_all;
+       blk_queue_merge_bvec(md->queue, dm_merge_bvec);
+}
+
 /*
  * Allocate and initialise a blank device with a given minor.
  */
@@ -1895,33 +1917,11 @@ static struct mapped_device *alloc_dev(int minor)
        INIT_LIST_HEAD(&md->uevent_list);
        spin_lock_init(&md->uevent_lock);
 
-       md->queue = blk_init_queue(dm_request_fn, NULL);
+       md->queue = blk_alloc_queue(GFP_KERNEL);
        if (!md->queue)
                goto bad_queue;
 
-       /*
-        * Request-based dm devices cannot be stacked on top of bio-based dm
-        * devices.  The type of this dm device has not been decided yet,
-        * although we initialized the queue using blk_init_queue().
-        * The type is decided at the first table loading time.
-        * To prevent problematic device stacking, clear the queue flag
-        * for request stacking support until then.
-        *
-        * This queue is new, so no concurrency on the queue_flags.
-        */
-       queue_flag_clear_unlocked(QUEUE_FLAG_STACKABLE, md->queue);
-       md->saved_make_request_fn = md->queue->make_request_fn;
-       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);
-       md->queue->unplug_fn = dm_unplug_all;
-       blk_queue_merge_bvec(md->queue, dm_merge_bvec);
-       blk_queue_softirq_done(md->queue, dm_softirq_done);
-       blk_queue_prep_rq(md->queue, dm_prep_fn);
-       blk_queue_lld_busy(md->queue, dm_lld_busy);
-       blk_queue_ordered(md->queue, QUEUE_ORDERED_DRAIN_FLUSH);
+       dm_init_md_queue(md);
 
        md->disk = alloc_disk(1);
        if (!md->disk)
@@ -2160,6 +2160,48 @@ unsigned dm_get_md_type(struct mapped_device *md)
        return md->type;
 }
 
+/*
+ * Fully initialize a request-based queue (->elevator, ->request_fn, etc).
+ */
+static int dm_init_request_based_queue(struct mapped_device *md)
+{
+       struct request_queue *q = NULL;
+
+       if (md->queue->elevator)
+               return 1;
+
+       /* Fully initialize the queue */
+       q = blk_init_allocated_queue(md->queue, dm_request_fn, NULL);
+       if (!q)
+               return 0;
+
+       md->queue = q;
+       md->saved_make_request_fn = md->queue->make_request_fn;
+       dm_init_md_queue(md);
+       blk_queue_softirq_done(md->queue, dm_softirq_done);
+       blk_queue_prep_rq(md->queue, dm_prep_fn);
+       blk_queue_lld_busy(md->queue, dm_lld_busy);
+       blk_queue_ordered(md->queue, QUEUE_ORDERED_DRAIN_FLUSH);
+
+       elv_register_queue(md->queue);
+
+       return 1;
+}
+
+/*
+ * Setup the DM device's queue based on md's type
+ */
+int dm_setup_md_queue(struct mapped_device *md)
+{
+       if ((dm_get_md_type(md) == DM_TYPE_REQUEST_BASED) &&
+           !dm_init_request_based_queue(md)) {
+               DMWARN("Cannot initialize queue for request-based mapped device");
+               return -EINVAL;
+       }
+
+       return 0;
+}
+
 static struct mapped_device *dm_find_md(dev_t dev)
 {
        struct mapped_device *md;

diff --git a/drivers/md/dm.h b/drivers/md/dm.h
index 1db7825..450fbd9 100644 (file)
--- a/drivers/md/dm.h
+++ b/drivers/md/dm.h
@@ -71,6 +71,8 @@ void dm_unlock_md_type(struct mapped_device *md);
 void dm_set_md_type(struct mapped_device *md, unsigned type);
 unsigned dm_get_md_type(struct mapped_device *md);
 
+int dm_setup_md_queue(struct mapped_device *md);
+
 /*
  * To check the return value from dm_table_find_target().
  */