[linux-lvm] PATCH: bdi_congested-dm.patch (was: Re: IO scheduler, queue depth, nr_requests)
Miquel van Smoorenburg
miquels at cistron.nl
Thu Feb 26 11:28:06 UTC 2004
According to Miquel van Smoorenburg:
> Okay here you go.
> bdi_congested-core.patch
Here's the dm part:
bdi_congested-dm.patch
--- linux-2.6.3.orig/drivers/md/dm.h 2004-02-04 04:43:45.000000000 +0100
+++ linux-2.6.3-congested_fn/drivers/md/dm.h 2004-02-26 14:22:41.000000000 +0100
@@ -115,6 +115,7 @@ struct list_head *dm_table_get_devices(s
int dm_table_get_mode(struct dm_table *t);
void dm_table_suspend_targets(struct dm_table *t);
void dm_table_resume_targets(struct dm_table *t);
+int dm_table_any_congested(struct dm_table *t, int bdi_bits);
/*-----------------------------------------------------------------
* A registry of target types.
--- linux-2.6.3.orig/drivers/md/dm-table.c 2004-02-04 04:44:59.000000000 +0100
+++ linux-2.6.3-congested_fn/drivers/md/dm-table.c 2004-02-26 14:22:30.000000000 +0100
@@ -857,6 +857,20 @@ void dm_table_resume_targets(struct dm_t
}
}
+int dm_table_any_congested(struct dm_table *t, int bdi_bits)
+{
+ struct list_head *d, *devices;
+ int r = 0;
+
+ devices = dm_table_get_devices(t);
+ for (d = devices->next; d != devices; d = d->next) {
+ struct dm_dev *dd = list_entry(d, struct dm_dev, list);
+ request_queue_t *q = bdev_get_queue(dd->bdev);
+ r |= bdi_congested(&q->backing_dev_info, bdi_bits);
+ }
+
+ return r;
+}
EXPORT_SYMBOL(dm_get_device);
EXPORT_SYMBOL(dm_put_device);
--- linux-2.6.3.orig/drivers/md/dm.c 2004-02-22 13:52:15.000000000 +0100
+++ linux-2.6.3-congested_fn/drivers/md/dm.c 2004-02-26 14:26:57.000000000 +0100
@@ -526,6 +526,18 @@ static int dm_request(request_queue_t *q
return 0;
}
+static int dm_any_congested(void *congested_data, int bdi_bits)
+{
+ int r;
+ struct mapped_device *md = congested_data;
+
+ down_read(&md->lock);
+ r = dm_table_any_congested(md->map, bdi_bits);
+ up_read(&md->lock);
+
+ return r;
+}
+
/*-----------------------------------------------------------------
* A bitset is used to keep track of allocated minor numbers.
*---------------------------------------------------------------*/
@@ -608,6 +620,8 @@ static struct mapped_device *alloc_dev(u
}
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);
md->io_pool = mempool_create(MIN_IOS, mempool_alloc_slab,
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