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authorNeilBrown <neilb@suse.de>2010-07-26 11:57:07 +1000
committerNeilBrown <neilb@suse.de>2010-07-26 12:52:29 +1000
commit11d8a6e3719519fbc0e2c9d61b6fa931b84bf813 (patch)
tree13a075d1423b2caa3d3264db0cf8cd378c545623 /drivers/md
parent4a5add49951e698073011855d1a8a7306bc9308d (diff)
md/raid5: export is_congested test
the dm module will need this for dm-raid45. Also only access ->queue->backing_dev_info->congested_fn if ->queue actually exists. It won't in a dm target. Signed-off-by: NeilBrown <neilb@suse.de>
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/raid5.c22
-rw-r--r--drivers/md/raid5.h2
2 files changed, 17 insertions, 7 deletions
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 9c462f6659c3..ad6694f8a3a8 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -3678,17 +3678,14 @@ static void raid5_unplug_device(struct request_queue *q)
unplug_slaves(mddev);
}
-static int raid5_congested(void *data, int bits)
+int md_raid5_congested(mddev_t *mddev, int bits)
{
- mddev_t *mddev = data;
raid5_conf_t *conf = mddev->private;
/* No difference between reads and writes. Just check
* how busy the stripe_cache is
*/
- if (mddev_congested(mddev, bits))
- return 1;
if (conf->inactive_blocked)
return 1;
if (conf->quiesce)
@@ -3698,6 +3695,15 @@ static int raid5_congested(void *data, int bits)
return 0;
}
+EXPORT_SYMBOL_GPL(md_raid5_congested);
+
+static int raid5_congested(void *data, int bits)
+{
+ mddev_t *mddev = data;
+
+ return mddev_congested(mddev, bits) ||
+ md_raid5_congested(mddev, bits);
+}
/* We want read requests to align with chunks where possible,
* but write requests don't need to.
@@ -5184,13 +5190,14 @@ static int run(mddev_t *mddev)
mddev->queue->backing_dev_info.ra_pages = 2 * stripe;
blk_queue_merge_bvec(mddev->queue, raid5_mergeable_bvec);
+
+ mddev->queue->backing_dev_info.congested_data = mddev;
+ mddev->queue->backing_dev_info.congested_fn = raid5_congested;
}
mddev->queue->queue_lock = &conf->device_lock;
mddev->queue->unplug_fn = raid5_unplug_device;
- mddev->queue->backing_dev_info.congested_data = mddev;
- mddev->queue->backing_dev_info.congested_fn = raid5_congested;
chunk_size = mddev->chunk_sectors << 9;
blk_queue_io_min(mddev->queue, chunk_size);
@@ -5220,7 +5227,8 @@ static int stop(mddev_t *mddev)
md_unregister_thread(mddev->thread);
mddev->thread = NULL;
- mddev->queue->backing_dev_info.congested_fn = NULL;
+ if (mddev->queue)
+ mddev->queue->backing_dev_info.congested_fn = NULL;
blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/
free_conf(conf);
mddev->private = NULL;
diff --git a/drivers/md/raid5.h b/drivers/md/raid5.h
index 61b6b25dc5e7..d6470dec667a 100644
--- a/drivers/md/raid5.h
+++ b/drivers/md/raid5.h
@@ -497,5 +497,7 @@ static inline int algorithm_is_DDF(int layout)
{
return layout >= 8 && layout <= 10;
}
+
+extern int md_raid5_congested(mddev_t *mddev, int bits);
extern int raid5_set_cache_size(mddev_t *mddev, int size);
#endif