md/raid5: rearrange a test in fetch_block6.

Next patch will unite fetch_block5 and fetch_block6.
First I want to make the differences a little more clear.

For RAID6 if we are writing at all and there is a failed device, then
we need to load or compute every block so we can do a
reconstruct-write.
This case isn't needed for RAID5 - we will do a read-modify-write in
that case.
So make that test a separate test in fetch_block6 rather than merged
with two other tests.

Make a similar change in fetch_block5 so the one bit that is not
needed for RAID6 is clearly separate.

Signed-off-by: NeilBrown <neilb@suse.de>
Reviewed-by: Namhyung Kim <namhyung@gmail.com>

1 files changed, 5 insertions, 7 deletions

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 74a575bbd25c..a3d7cd96cfb7 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -2326,9 +2326,8 @@ static int fetch_block5(struct stripe_head *sh, struct stripe_head_state *s,
             (dev->toread ||
              (dev->towrite && !test_bit(R5_OVERWRITE, &dev->flags)) ||
              s->syncing || s->expanding ||
-             (s->failed &&
-              (failed_dev->toread ||
-               (failed_dev->towrite &&
+             (s->failed && failed_dev->toread) ||
+             (s->failed && failed_dev->towrite &&
                 !test_bit(R5_OVERWRITE, &failed_dev->flags)))))) {
                 /* We would like to get this block, possibly by computing it,
                  * otherwise read it if the backing disk is insync
@@ -2399,10 +2398,9 @@ static int fetch_block6(struct stripe_head *sh, struct stripe_head_state *s,
             (dev->toread ||
              (dev->towrite && !test_bit(R5_OVERWRITE, &dev->flags)) ||
              s->syncing || s->expanding ||
-             (s->failed >= 1 &&
-              (fdev[0]->toread || s->to_write)) ||
-             (s->failed >= 2 &&
-              (fdev[1]->toread || s->to_write)))) {
+             (s->failed >= 1 && fdev[0]->toread) ||
+             (s->failed >= 2 && fdev[1]->toread) ||
+             (s->failed && s->to_write)) {
                 /* we would like to get this block, possibly by computing it,
                  * otherwise read it if the backing disk is insync
                  */