[PATCH] md: support check-without-repair of raid10 arrays

Also keep count on the number of errors found.

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, 4 insertions, 0 deletions

diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 8f58a447d9f0..1fa70c34b7d2 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -1206,6 +1206,10 @@ static void sync_request_write(mddev_t *mddev, r10bio_t *r10_bio)
                                 break;
                 if (j == vcnt)
                         continue;
+                mddev->resync_mismatches += r10_bio->sectors;
+                if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
+                        /* Don't fix anything. */
+                        continue;
                 /* Ok, we need to write this bio
                  * First we need to fixup bv_offset, bv_len and
                  * bi_vecs, as the read request might have corrupted these