diff options
| -rw-r--r-- | drivers/md/raid1.c | 21 |
1 files changed, 14 insertions, 7 deletions
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c index 3a95cc5e029..46677d7d998 100644 --- a/drivers/md/raid1.c +++ b/drivers/md/raid1.c @@ -1240,17 +1240,24 @@ static void sync_request_write(mddev_t *mddev, r1bio_t *r1_bio) } r1_bio->read_disk = primary; for (i=0; i<mddev->raid_disks; i++) - if (r1_bio->bios[i]->bi_end_io == end_sync_read && - test_bit(BIO_UPTODATE, &r1_bio->bios[i]->bi_flags)) { + if (r1_bio->bios[i]->bi_end_io == end_sync_read) { int j; int vcnt = r1_bio->sectors >> (PAGE_SHIFT- 9); struct bio *pbio = r1_bio->bios[primary]; struct bio *sbio = r1_bio->bios[i]; - for (j = vcnt; j-- ; ) - if (memcmp(page_address(pbio->bi_io_vec[j].bv_page), - page_address(sbio->bi_io_vec[j].bv_page), - PAGE_SIZE)) - break; + + if (test_bit(BIO_UPTODATE, &sbio->bi_flags)) { + for (j = vcnt; j-- ; ) { + struct page *p, *s; + p = pbio->bi_io_vec[j].bv_page; + s = sbio->bi_io_vec[j].bv_page; + if (memcmp(page_address(p), + page_address(s), + PAGE_SIZE)) + break; + } + } else + j = 0; if (j >= 0) mddev->resync_mismatches += r1_bio->sectors; if (j < 0 || test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) { |