md/raid10 - avoid reading from known bad blocks - part 3

When attempting to repair a read error, don't read from
devices with a known bad block.

As we are only reading PAGE_SIZE blocks, we don't try to
narrow down to smaller regions in the hope that only part of this
page is bad - it isn't worth the effort.

Signed-off-by: NeilBrown <neilb@suse.de>

1 files changed, 6 insertions, 1 deletions

diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 37801d68a4cd..a5ecea2672b5 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -1594,10 +1594,15 @@ static void fix_read_error(conf_t *conf, mddev_t *mddev, r10bio_t *r10_bio)
 
                 rcu_read_lock();
                 do {
+                        sector_t first_bad;
+                        int bad_sectors;
+
                         d = r10_bio->devs[sl].devnum;
                         rdev = rcu_dereference(conf->mirrors[d].rdev);
                         if (rdev &&
-                            test_bit(In_sync, &rdev->flags)) {
+                            test_bit(In_sync, &rdev->flags) &&
+                            is_badblock(rdev, r10_bio->devs[sl].addr + sect, s,
+                                        &first_bad, &bad_sectors) == 0) {
                                 atomic_inc(&rdev->nr_pending);
                                 rcu_read_unlock();
                                 success = sync_page_io(rdev,