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>

1 files changed, 16 insertions, 0 deletions

diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 61890231972e..cc6a56a659a3 100644
--- 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.