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md: override md superblock recovery_offset for journal device

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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>
This commit is contained in:
Shaohua Li
2015-08-13 14:31:56 -07:00
committed by NeilBrown
parent bac624f3f8
commit 3069aa8def
3 changed files with 17 additions and 2 deletions
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6
drivers/md/md.c
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@@ -1646,6 +1646,7 @@ static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev)
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 @@ static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev)
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 @@ static int remove_and_add_spares(struct mddev *mddev,
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)))