raid devices should be aligned to a chunk size
(when this feature will be enabled) because zones
will become un-aligned to chunks and we will traverse
between zones in a single IO access.
raid0.c | 22 +++++++++++++++++++++-
1 file changed, 21 insertions(+), 1 deletion(-)
Signed-off-by: raziebe@xxxxxxxxx
---
diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c
index 0fcd9b5..987a926 100644
--- a/drivers/md/raid0.c
+++ b/drivers/md/raid0.c
@@ -302,6 +302,26 @@ static sector_t raid0_size(mddev_t *mddev, sector_t sectors, int raid_disks)
return array_sectors;
}
+/*
+ * Align devices to a chunk size, else zones will not be aligned
+*/
+static void align_devices_to_chunk_size(struct list_head *disks,
+ int chunk_sects)
+{
+ sector_t sectors;
+ mdk_rdev_t *rdev;
+
+ list_for_each_entry(rdev, disks, same_set) {
+ sectors = rdev->sectors;
+ sector_div(sectors, chunk_sects);
+ sectors = sectors * chunk_sects;
+ printk(KERN_INFO "raid0: reduce device size: %lld --> %lld\n",
+ (unsigned long long)rdev->sectors,
+ (unsigned long long)sectors);
+ rdev->sectors = sectors;
+ }
+}
+
static int raid0_run(mddev_t *mddev)
{
int ret;
@@ -313,7 +333,7 @@ static int raid0_run(mddev_t *mddev)
}
blk_queue_max_sectors(mddev->queue, mddev->chunk_sectors);
mddev->queue->queue_lock = &mddev->queue->__queue_lock;
-
+ align_devices_to_chunk_size(&mddev->disks, mddev->chunk_sectors);
ret = create_strip_zones(mddev);
if (ret < 0)
return ret;
--
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