We should reset sblock->xxx_error stats before calling
scrub_recheck_block_checksum().

Current code run correctly because all sblock are allocated by
k[cz]alloc(), and the error stats are not got changed.

Signed-off-by: Zhao Lei <zhao...@cn.fujitsu.com>
---
 fs/btrfs/scrub.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
index c8c16f4..4326e16 100644
--- a/fs/btrfs/scrub.c
+++ b/fs/btrfs/scrub.c
@@ -1508,6 +1508,7 @@ static void scrub_recheck_block(struct btrfs_fs_info 
*fs_info,
        sblock->no_io_error_seen = 1;
        sblock->header_error = 0;
        sblock->checksum_error = 0;
+       sblock->generation_error = 0;
 
        for (page_num = 0; page_num < sblock->page_count; page_num++) {
                struct bio *bio;
@@ -2216,6 +2217,9 @@ static void scrub_missing_raid56_worker(struct btrfs_work 
*work)
        logical = sblock->pagev[0]->logical;
        dev = sblock->pagev[0]->dev;
 
+       sblock->header_error = 0;
+       sblock->checksum_error = 0;
+       sblock->generation_error = 0;
        if (sblock->no_io_error_seen) {
                scrub_recheck_block_checksum(fs_info, sblock, is_metadata,
                                             have_csum, csum, generation,
-- 
1.8.5.1

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