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| author | NeilBrown <neilb@suse.de> | 2011-07-27 01:00:36 (GMT) |
|---|---|---|
| committer | NeilBrown <neilb@suse.de> | 2011-07-27 01:00:36 (GMT) |
| commit | 5d35e09cae47bbae2739f432658860680de21866 (patch) | |
| tree | 619a548f43403883f394062f3397de2ca6eb6c4a | |
| parent | c5a3100062cf277d3edd4e6f4a1f1e403524b464 (diff) | |
| download | linux-5d35e09cae47bbae2739f432658860680de21866.tar.xz | |
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>
| -rw-r--r-- | drivers/md/raid5.c | 12 |
1 files changed, 5 insertions, 7 deletions
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 74a575b..a3d7cd9 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 */ |