[PATCH 3/4] md: Don't do normal-write on unresync area of replacement-disk.

[majianpeng <majianpeng@gmail.com>]

Replacement is a fullsync which don't depent on bitmap.So regardless of
the presence and absence of bitmap, it do full resync.
If offset of normal io is larger than offset of resync,it will write
again when resync arrived this offset.

Signed-off-by: Jianpeng Ma <majianpeng@gmail.com>
---
 drivers/md/raid1.c  |    4 +++-
 drivers/md/raid10.c |    4 +++-
 drivers/md/raid5.c  |    3 ++-
 3 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index d5bddfc..142a5fa 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -1173,7 +1173,9 @@ read_again:
 				set_bit(R1BIO_Degraded, &r1_bio->state);
 			continue;
 		}
-
+		if (test_bit(Replacement, &rdev->flags) &&
+			conf->mddev->curr_resync < r1_bio->sector)
+			continue;
 		atomic_inc(&rdev->nr_pending);
 		if (test_bit(WriteErrorSeen, &rdev->flags)) {
 			sector_t first_bad;
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 64d4824..bb11cfb 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -1337,7 +1337,9 @@ retry_write:
 			     || test_bit(Unmerged, &rdev->flags)))
 			rdev = NULL;
 		if (rrdev && (test_bit(Faulty, &rrdev->flags)
-			      || test_bit(Unmerged, &rrdev->flags)))
+			|| test_bit(Unmerged, &rrdev->flags) || 
+			(test_bit(Replacement, &rrdev->flags) &&
+			conf->mddev->curr_resync < r10_bio->sector)))
 			rrdev = NULL;
 
 		r10_bio->devs[i].bio = NULL;
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index bd49623..e0a2a39 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -602,7 +602,8 @@ static void ops_run_io(struct stripe_head *sh, struct stripe_head_state *s)
 			rdev = NULL;
 		if (rdev)
 			atomic_inc(&rdev->nr_pending);
-		if (rrdev && test_bit(Faulty, &rrdev->flags))
+		if (rrdev && (test_bit(Faulty, &rrdev->flags) ||
+			conf->mddev->curr_resync < sh->sector))
 			rrdev = NULL;
 		if (rrdev)
 			atomic_inc(&rrdev->nr_pending);
-- 
1.7.9.5