[PATCH] md: enable bypassing cache for reads

Call the chunk_aligned_read where appropriate.

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 2ac2e56a1a40..2e676e33744c 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -2808,6 +2808,11 @@ static int make_request(request_queue_t *q, struct bio * bi)
         disk_stat_inc(mddev->gendisk, ios[rw]);
         disk_stat_add(mddev->gendisk, sectors[rw], bio_sectors(bi));
 
+        if (bio_data_dir(bi) == READ &&
+             mddev->reshape_position == MaxSector &&
+             chunk_aligned_read(q,bi))
+                return 0;
+
         logical_sector = bi->bi_sector & ~((sector_t)STRIPE_SECTORS-1);
         last_sector = bi->bi_sector + (bi->bi_size>>9);
         bi->bi_next = NULL;