md/raid10: fix that replacement cannot complete recovery after reassemble

[ Upstream commit bda3153998f3eb2cafa4a6311971143628eacdbc ]

During assemble, the spare marked for replacement is not checked.
conf->fullsync cannot be updated to be 1. As a result, recovery will
treat it as a clean array. All recovering sectors are skipped. Original
device is replaced with the not-recovered spare.

mdadm -C /dev/md0 -l10 -n4 -pn2 /dev/loop[0123]
mdadm /dev/md0 -a /dev/loop4
mdadm /dev/md0 --replace /dev/loop0
mdadm -S /dev/md0 # stop array during recovery

mdadm -A /dev/md0 /dev/loop[01234]

After reassemble, you can see recovery go on, but it completes
immediately. In fact, recovery is not actually processed.

To solve this problem, we just add the missing logics for replacment
spares. (In raid1.c or raid5.c, they have already been checked.)

Reported-by: Alex Chen <alexchen@synology.com>
Reviewed-by: Alex Wu <alexwu@synology.com>
Reviewed-by: Chung-Chiang Cheng <cccheng@synology.com>
Signed-off-by: BingJing Chang <bingjingc@synology.com>
Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index b20c23f970f494f18d6a4b5b29de8275aef77bc8..262a0f0f8fd5cd9aaa52c75bb4655c7f96b639bd 100644 (file)
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -3754,6 +3754,13 @@ static int raid10_run(struct mddev *mddev)
                            disk->rdev->saved_raid_disk < 0)
                                conf->fullsync = 1;
                }
+
+               if (disk->replacement &&
+                   !test_bit(In_sync, &disk->replacement->flags) &&
+                   disk->replacement->saved_raid_disk < 0) {
+                       conf->fullsync = 1;
+               }
+
                disk->recovery_disabled = mddev->recovery_disabled - 1;
        }