md: do not progress the resync process if the stripe was blocked

handle_stripe will take no action on a stripe when waiting for userspace
to unblock the array, so do not report completed sectors.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>

1 files changed, 13 insertions, 6 deletions

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 46132fca3469..b428e15d59af 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -2507,7 +2507,7 @@ static void handle_stripe_expansion(raid5_conf_t *conf, struct stripe_head *sh,
  *
  */
 
-static void handle_stripe5(struct stripe_head *sh)
+static bool handle_stripe5(struct stripe_head *sh)
 {
         raid5_conf_t *conf = sh->raid_conf;
         int disks = sh->disks, i;
@@ -2755,9 +2755,11 @@ static void handle_stripe5(struct stripe_head *sh)
         ops_run_io(sh, &s);
 
         return_io(return_bi);
+
+        return blocked_rdev == NULL;
 }
 
-static void handle_stripe6(struct stripe_head *sh, struct page *tmp_page)
+static bool handle_stripe6(struct stripe_head *sh, struct page *tmp_page)
 {
         raid6_conf_t *conf = sh->raid_conf;
         int disks = sh->disks;
@@ -2968,14 +2970,17 @@ static void handle_stripe6(struct stripe_head *sh, struct page *tmp_page)
         ops_run_io(sh, &s);
 
         return_io(return_bi);
+
+        return blocked_rdev == NULL;
 }
 
-static void handle_stripe(struct stripe_head *sh, struct page *tmp_page)
+/* returns true if the stripe was handled */
+static bool handle_stripe(struct stripe_head *sh, struct page *tmp_page)
 {
         if (sh->raid_conf->level == 6)
-                handle_stripe6(sh, tmp_page);
+                return handle_stripe6(sh, tmp_page);
         else
-                handle_stripe5(sh);
+                return handle_stripe5(sh);
 }
 
 
@@ -3691,7 +3696,9 @@ static inline sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *ski
         clear_bit(STRIPE_INSYNC, &sh->state);
         spin_unlock(&sh->lock);
 
-        handle_stripe(sh, NULL);
+        /* wait for any blocked device to be handled */
+        while(unlikely(!handle_stripe(sh, NULL)))
+                ;
         release_stripe(sh);
 
         return STRIPE_SECTORS;