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authorGuoqing Jiang <gqjiang@suse.com>2016-05-02 18:50:12 +0300
committerShaohua Li <shli@fb.com>2016-05-04 22:39:35 +0300
commit18c9ff7f487efa8e88886bee21bd3516dde05bc5 (patch)
treeae819ad9bda782b06bfa86281cc432afef3134ff /drivers/md/md-cluster.c
parentc9d65032282943d11b2773ed6f0279ba4820fed1 (diff)
downloadlinux-18c9ff7f487efa8e88886bee21bd3516dde05bc5.tar.xz
md-cluster: sync bitmap when node received RESYNCING msg
If the node received RESYNCING message which means another node will perform resync with the area, then we don't want to do it again in another node. Let's set RESYNC_MASK and clear NEEDED_MASK for the region from old-low to new-low which has finished syncing, and the region from old-hi to new-hi is about to syncing, bitmap_sync_with_cluste is introduced for the purpose. Reviewed-by: NeilBrown <neilb@suse.com> Signed-off-by: Guoqing Jiang <gqjiang@suse.com> Signed-off-by: Shaohua Li <shli@fb.com>
Diffstat (limited to 'drivers/md/md-cluster.c')
-rw-r--r--drivers/md/md-cluster.c27
1 files changed, 27 insertions, 0 deletions
diff --git a/drivers/md/md-cluster.c b/drivers/md/md-cluster.c
index 30f1160142c1..a55b5f4d0dbe 100644
--- a/drivers/md/md-cluster.c
+++ b/drivers/md/md-cluster.c
@@ -85,6 +85,9 @@ struct md_cluster_info {
struct completion newdisk_completion;
wait_queue_head_t wait;
unsigned long state;
+ /* record the region in RESYNCING message */
+ sector_t sync_low;
+ sector_t sync_hi;
};
enum msg_type {
@@ -411,6 +414,30 @@ static void process_suspend_info(struct mddev *mddev,
md_wakeup_thread(mddev->thread);
return;
}
+
+ /*
+ * The bitmaps are not same for different nodes
+ * if RESYNCING is happening in one node, then
+ * the node which received the RESYNCING message
+ * probably will perform resync with the region
+ * [lo, hi] again, so we could reduce resync time
+ * a lot if we can ensure that the bitmaps among
+ * different nodes are match up well.
+ *
+ * sync_low/hi is used to record the region which
+ * arrived in the previous RESYNCING message,
+ *
+ * Call bitmap_sync_with_cluster to clear
+ * NEEDED_MASK and set RESYNC_MASK since
+ * resync thread is running in another node,
+ * so we don't need to do the resync again
+ * with the same section */
+ bitmap_sync_with_cluster(mddev, cinfo->sync_low,
+ cinfo->sync_hi,
+ lo, hi);
+ cinfo->sync_low = lo;
+ cinfo->sync_hi = hi;
+
s = kzalloc(sizeof(struct suspend_info), GFP_KERNEL);
if (!s)
return;