md: override md superblock recovery_offset for journal device
Journal device stores data in a log structure. We need record the log
start. Here we override md superblock recovery_offset for this purpose.
This field of a journal device is meaningless otherwise.
Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: NeilBrown <neilb@suse.com>
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 391341a..3592beb 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -1646,6 +1646,7 @@
return -EINVAL;
}
set_bit(Journal, &rdev->flags);
+ rdev->journal_tail = le64_to_cpu(sb->journal_tail);
break;
default:
rdev->saved_raid_disk = role;
@@ -1721,6 +1722,9 @@
sb->feature_map |=
cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP);
}
+ /* Note: recovery_offset and journal_tail share space */
+ if (test_bit(Journal, &rdev->flags))
+ sb->journal_tail = cpu_to_le64(rdev->journal_tail);
if (test_bit(Replacement, &rdev->flags))
sb->feature_map |=
cpu_to_le32(MD_FEATURE_REPLACEMENT);
@@ -8097,6 +8101,8 @@
continue;
if (test_bit(Faulty, &rdev->flags))
continue;
+ if (test_bit(Journal, &rdev->flags))
+ continue;
if (mddev->ro &&
! (rdev->saved_raid_disk >= 0 &&
!test_bit(Bitmap_sync, &rdev->flags)))