md-cluster: Suspend writes in RAID10 if within range

If there is a resync going on, all nodes must suspend
writes to the range. This is recorded in suspend_info
and suspend_list.

If there is an I/O within the ranges of any of the
suspend_info, area_resyncing will return 1.

Signed-off-by: Guoqing Jiang <gqjiang@suse.com>
Signed-off-by: Shaohua Li <shli@fb.com>

diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 6189023..cc6a56a 100644 (file)
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -1294,6 +1294,22 @@ static void raid10_write_request(struct mddev *mddev, struct bio *bio,
        sector_t sectors;
        int max_sectors;
 
+       if ((mddev_is_clustered(mddev) &&
+            md_cluster_ops->area_resyncing(mddev, WRITE,
+                                           bio->bi_iter.bi_sector,
+                                           bio_end_sector(bio)))) {
+               DEFINE_WAIT(w);
+               for (;;) {
+                       prepare_to_wait(&conf->wait_barrier,
+                                       &w, TASK_IDLE);
+                       if (!md_cluster_ops->area_resyncing(mddev, WRITE,
+                                bio->bi_iter.bi_sector, bio_end_sector(bio)))
+                               break;
+                       schedule();
+               }
+               finish_wait(&conf->wait_barrier, &w);
+       }
+
        /*
         * Register the new request and wait if the reconstruction
         * thread has put up a bar for new requests.