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bcache: count backing device I/O error for writeback I/O

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Commit c7b7bd0740 ("bcache: add io_disable to struct cached_dev")
counts backing device I/O requets and set dc->io_disable to true if error
counters exceeds dc->io_error_limit. But it only counts I/O errors for
regular I/O request, neglects errors of write back I/Os when backing device
is offline.

This patch counts the errors of writeback I/Os, in dirty_endio() if
bio->bi_status is  not 0, it means error happens when writing dirty keys
to backing device, then bch_count_backing_io_errors() is called.

By this fix, even there is no reqular I/O request coming, if writeback I/O
errors exceed dc->io_error_limit, the bcache device may still be stopped
for the broken backing device.

Fixes: c7b7bd0740 ("bcache: add io_disable to struct cached_dev")
Signed-off-by: Coly Li <colyli@suse.de>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Coly Li 2018-05-03 18:51:34 +08:00 committed by Jens Axboe
parent 6147305c73
commit bf78980fcc
1 changed files with 3 additions and 1 deletions
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4
drivers/md/bcache/writeback.c
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@ -244,8 +244,10 @@ static void dirty_endio(struct bio *bio)
struct keybuf_key *w = bio->bi_private;
struct dirty_io *io = w->private;
if (bio->bi_status)
if (bio->bi_status) {
SET_KEY_DIRTY(&w->key, false);
bch_count_backing_io_errors(io->dc, bio);
}
closure_put(&io->cl);
}