From: NeilBrown <neilb@suse.de>
Date: Wed, 17 Oct 2007 06:30:55 +0000 (-0700)
Subject: md: make sure read errors are auto-corrected during a 'check' resync in raid1
X-Git-Tag: firefly_0821_release~25172
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=cf7a44168d743ca97863b7f34ed42a45fd7b5ab0;p=firefly-linux-kernel-4.4.55.git

md: make sure read errors are auto-corrected during a 'check' resync in raid1

Whenever a read error is found, we should attempt to overwrite with correct
data to 'fix' it.

However when do a 'check' pass (which compares data blocks that are
successfully read, but doesn't normally overwrite) we don't do that.  We
should.

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

diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 0bcefad82413..16775a0df7f6 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -1214,7 +1214,8 @@ static void sync_request_write(mddev_t *mddev, r1bio_t *r1_bio)
 					j = 0;
 				if (j >= 0)
 					mddev->resync_mismatches += r1_bio->sectors;
-				if (j < 0 || test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) {
+				if (j < 0 || (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)
+					      && test_bit(BIO_UPTODATE, &sbio->bi_flags))) {
 					sbio->bi_end_io = NULL;
 					rdev_dec_pending(conf->mirrors[i].rdev, mddev);
 				} else {