From: Raz Ben-Jehuda(caro) <raziebe@gmail.com>
Date: Sun, 10 Dec 2006 10:20:48 +0000 (-0800)
Subject: [PATCH] md: enable bypassing cache for reads
X-Git-Tag: v2.6.20-rc1~145^2~27
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5248861511d6aae4997a5aa7152824d87587b0b6;p=linux-2.6

[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>
---

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 2ac2e56a1a..2e676e3374 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;