mainline inclusion from mainline-5.3-rc1 commit 08ec1e6282f271698f0053983fab89de6e1a8217 category: backport When backing device super block is written by bch_write_bdev_super(), the bio complete callback write_bdev_super_endio() simply ignores I/O status. Indeed such write request also contribute to backing device health status if the request failed. This patch checkes bio->bi_status in write_bdev_super_endio(), if there is error, bch_count_backing_io_errors() will be called to count an I/O error to dc->io_errors. Signed-off-by: Coly Li <colyli@suse.de> Signed-off-by: Jens Axboe <axboe@kernel.dk> --- drivers/md/bcache/super.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c index 4b7c5567576b..f73b75a4898b 100644 --- a/drivers/md/bcache/super.c +++ b/drivers/md/bcache/super.c @@ -197,7 +197,9 @@ static const char *read_super(struct cache_sb *sb, struct block_device *bdev, static void write_bdev_super_endio(struct bio *bio) { struct cached_dev *dc = bio->bi_private; - /* XXX: error checking */ + + if (bio->bi_status) + bch_count_backing_io_errors(dc, bio); closure_put(&dc->sb_write); } -- 2.16.4