md/raid1: handle activation of replacement device when recovery completes.

When recovery completes ->spare_active is called.
This checks if the replacement is ready and if so it fails
the original.

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

diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 3d9aa0c..f680751 100644 (file)
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -1265,6 +1265,25 @@ static int raid1_spare_active(struct mddev *mddev)
         */
        for (i = 0; i < conf->raid_disks; i++) {
                struct md_rdev *rdev = conf->mirrors[i].rdev;
+               struct md_rdev *repl = conf->mirrors[conf->raid_disks + i].rdev;
+               if (repl
+                   && repl->recovery_offset == MaxSector
+                   && !test_bit(Faulty, &repl->flags)
+                   && !test_and_set_bit(In_sync, &repl->flags)) {
+                       /* replacement has just become active */
+                       if (!rdev ||
+                           !test_and_clear_bit(In_sync, &rdev->flags))
+                               count++;
+                       if (rdev) {
+                               /* Replaced device not technically
+                                * faulty, but we need to be sure
+                                * it gets removed and never re-added
+                                */
+                               set_bit(Faulty, &rdev->flags);
+                               sysfs_notify_dirent_safe(
+                                       rdev->sysfs_state);
+                       }
+               }
                if (rdev
                    && !test_bit(Faulty, &rdev->flags)
                    && !test_and_set_bit(In_sync, &rdev->flags)) {
@@ -1362,10 +1381,21 @@ static int raid1_remove_disk(struct mddev *mddev, struct md_rdev *rdev)
                        err = -EBUSY;
                        p->rdev = rdev;
                        goto abort;
-               } else {
-                       clear_bit(Replacement, &rdev->flags);
+               } else if (conf->mirrors[conf->raid_disks + number].rdev) {
+                       /* We just removed a device that is being replaced.
+                        * Move down the replacement.  We drain all IO before
+                        * doing this to avoid confusion.
+                        */
+                       struct md_rdev *repl =
+                               conf->mirrors[conf->raid_disks + number].rdev;
+                       raise_barrier(conf);
+                       clear_bit(Replacement, &repl->flags);
+                       p->rdev = repl;
+                       conf->mirrors[conf->raid_disks + number].rdev = NULL;
+                       lower_barrier(conf);
+                       clear_bit(WantReplacement, &rdev->flags);
+               } else
                        clear_bit(WantReplacement, &rdev->flags);
-               }
                err = md_integrity_register(mddev);
        }
 abort: