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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>
This commit is contained in:
NeilBrown 2011-07-27 11:00:36 +10:00
parent c5a3100062
commit 5d35e09cae
1 changed files with 5 additions and 7 deletions
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12
drivers/md/raid5.c
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@ -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
*/