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bcache: fix unmatched generic_end_io_acct() & generic_start_io_acct() 

The function cached_dev_make_request() and flash_dev_make_request() call
generic_start_io_acct() with (struct bcache_device)->disk when they start a
closure. Then the function bio_complete() calls generic_end_io_acct() with
(struct search)->orig_bio->bi_disk when the closure has done.
Since the `bi_disk` is not the bcache device, the generic_end_io_acct() is
called with a wrong device queue.

It causes the "inflight" (in struct hd_struct) counter keep increasing
without decreasing.

This patch fix the problem by calling generic_end_io_acct() with
(struct bcache_device)->disk.

Signed-off-by: Zhai Zhaoxuan <kxuanobj@gmail.com>
Reviewed-by: Michael Lyle <mlyle@lyle.org>
Reviewed-by: Coly Li <colyli@suse.de>
Reviewed-by: Tang Junhui <tang.junhui@zte.com.cn>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
hifive-unleashed-5.1
Zhai Zhaoxuan 2018-01-08 12:21:27 -08:00 committed by Jens Axboe
parent ce439bf78b
commit b40503ea4f
1 changed files with 2 additions and 2 deletions
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4
drivers/md/bcache/request.c
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@ -633,8 +633,8 @@ static void request_endio(struct bio *bio)
static void bio_complete(struct search *s)
{
if (s->orig_bio) {
struct request_queue *q = s->orig_bio->bi_disk->queue;
generic_end_io_acct(q, bio_data_dir(s->orig_bio),
generic_end_io_acct(s->d->disk->queue,
bio_data_dir(s->orig_bio),
&s->d->disk->part0, s->start_time);
trace_bcache_request_end(s->d, s->orig_bio);