md/raid5: Clear bad blocks on successful write.

On a successful write to a known bad block, flag the sh
so that raid5d can remove the known bad block from the list.

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

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 3fa3f20..dbae459 100644 (file)
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -1675,6 +1675,8 @@ static void raid5_end_write_request(struct bio *bi, int error)
        raid5_conf_t *conf = sh->raid_conf;
        int disks = sh->disks, i;
        int uptodate = test_bit(BIO_UPTODATE, &bi->bi_flags);
+       sector_t first_bad;
+       int bad_sectors;
 
        for (i=0 ; i<disks; i++)
                if (bi == &sh->dev[i].req)
@@ -1691,7 +1693,9 @@ static void raid5_end_write_request(struct bio *bi, int error)
        if (!uptodate) {
                set_bit(WriteErrorSeen, &conf->disks[i].rdev->flags);
                set_bit(R5_WriteError, &sh->dev[i].flags);
-       }
+       } else if (is_badblock(conf->disks[i].rdev, sh->sector, STRIPE_SECTORS,
+                              &first_bad, &bad_sectors))
+               set_bit(R5_MadeGood, &sh->dev[i].flags);
 
        rdev_dec_pending(conf->disks[i].rdev, conf->mddev);
        
@@ -3078,6 +3082,13 @@ static void analyse_stripe(struct stripe_head *sh, struct stripe_head_state *s)
                        } else
                                clear_bit(R5_WriteError, &dev->flags);
                }
+               if (test_bit(R5_MadeGood, &dev->flags)) {
+                       if (!test_bit(Faulty, &rdev->flags)) {
+                               s->handle_bad_blocks = 1;
+                               atomic_inc(&rdev->nr_pending);
+                       } else
+                               clear_bit(R5_MadeGood, &dev->flags);
+               }
                if (!test_bit(R5_Insync, &dev->flags)) {
                        /* The ReadError flag will just be confusing now */
                        clear_bit(R5_ReadError, &dev->flags);
@@ -3340,6 +3351,12 @@ finish:
                                        md_error(conf->mddev, rdev);
                                rdev_dec_pending(rdev, conf->mddev);
                        }
+                       if (test_and_clear_bit(R5_MadeGood, &dev->flags)) {
+                               rdev = conf->disks[i].rdev;
+                               rdev_clear_badblocks(rdev, sh->sector,
+                                                    STRIPE_SECTORS);
+                               rdev_dec_pending(rdev, conf->mddev);
+                       }
                }
 
        if (s.ops_request)

diff --git a/drivers/md/raid5.h b/drivers/md/raid5.h
index 8620cb6..11b9566 100644 (file)
--- a/drivers/md/raid5.h
+++ b/drivers/md/raid5.h
@@ -274,6 +274,7 @@ struct stripe_head_state {
 #define        R5_Wantdrain    13      /* dev->towrite needs to be drained */
 #define        R5_WantFUA      14      /* Write should be FUA */
 #define        R5_WriteError   15      /* got a write error - need to record it */
+#define        R5_MadeGood     16      /* A bad block has been fixed by writing to it*/
 /*
  * Write method
  */