From: Li Nan <linan122@xxxxxxxxxx>
New disk should be added to "removed" position first instead of to be a
replacement. Commit 6090368abcb4 ("md/raid10: prioritize adding disk to
'removed' mirror") has fixed this issue for raid10. Fix it for raid1 now.
Signed-off-by: Li Nan <linan122@xxxxxxxxxx>
Reviewed-by: Yu Kuai <yukuai3@xxxxxxxxxx>
---
Changes in v2:
- improve commit log.
drivers/md/raid1.c | 26 +++++++++++++++-----------
1 file changed, 15 insertions(+), 11 deletions(-)
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 68a9e2d9985b..320bede4bfab 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -1782,7 +1782,7 @@ static int raid1_add_disk(struct mddev *mddev, struct md_rdev *rdev)
{
struct r1conf *conf = mddev->private;
int err = -EEXIST;
- int mirror = 0;
+ int mirror = 0, repl_slot = -1;
struct raid1_info *p;
int first = 0;
int last = conf->raid_disks - 1;
@@ -1825,17 +1825,21 @@ static int raid1_add_disk(struct mddev *mddev, struct md_rdev *rdev)
break;
}
if (test_bit(WantReplacement, &p->rdev->flags) &&
- p[conf->raid_disks].rdev == NULL) {
- /* Add this device as a replacement */
- clear_bit(In_sync, &rdev->flags);
- set_bit(Replacement, &rdev->flags);
- rdev->raid_disk = mirror;
- err = 0;
- conf->fullsync = 1;
- rcu_assign_pointer(p[conf->raid_disks].rdev, rdev);
- break;
- }
+ p[conf->raid_disks].rdev == NULL && repl_slot < 0)
+ repl_slot = mirror;
}
+
+ if (err && repl_slot >= 0) {
+ /* Add this device as a replacement */
+ p = conf->mirrors + repl_slot;
+ clear_bit(In_sync, &rdev->flags);
+ set_bit(Replacement, &rdev->flags);
+ rdev->raid_disk = repl_slot;
+ err = 0;
+ conf->fullsync = 1;
+ rcu_assign_pointer(p[conf->raid_disks].rdev, rdev);
+ }
+
print_conf(conf);
return err;
}
--
2.39.2
