From 5020ad7d143ccfcf8149974096220d59e5572120 Mon Sep 17 00:00:00 2001 From: NeilBrown Date: Mon, 2 Apr 2012 01:39:05 +1000 Subject: [PATCH] md/raid1,raid10: don't compare excess byte during consistency check. When comparing two pages read from different legs of a mirror, only compare the bytes that were read, not the whole page. In most cases we read a whole page, but in some cases with bad blocks or odd sizes devices we might read fewer than that. This bug has been present "forever" but at worst it might cause a report of two many mismatches and generate a little bit extra resync IO, so there is no need to back-port to -stable kernels. Reported-by: majianpeng Signed-off-by: NeilBrown --- drivers/md/raid1.c | 2 +- drivers/md/raid10.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c index 8c420f1..d35e4c9 100644 --- a/drivers/md/raid1.c +++ b/drivers/md/raid1.c @@ -1738,7 +1738,7 @@ static int process_checks(struct r1bio *r1_bio) s = sbio->bi_io_vec[j].bv_page; if (memcmp(page_address(p), page_address(s), - PAGE_SIZE)) + sbio->bi_io_vec[j].bv_len)) break; } } else diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c index 3540316..fff7821 100644 --- a/drivers/md/raid10.c +++ b/drivers/md/raid10.c @@ -1821,7 +1821,7 @@ static void sync_request_write(struct mddev *mddev, struct r10bio *r10_bio) for (j = 0; j < vcnt; j++) if (memcmp(page_address(fbio->bi_io_vec[j].bv_page), page_address(tbio->bi_io_vec[j].bv_page), - PAGE_SIZE)) + fbio->bi_io_vec[j].bv_len)) break; if (j == vcnt) continue; -- 2.7.4