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From b40503ea4f5c134b16ef405cab6c08f9343a0d06 Mon Sep 17 00:00:00 2001
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From: Zhai Zhaoxuan <kxuanobj@gmail.com>
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Date: Mon, 8 Jan 2018 12:21:27 -0800
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Subject: [PATCH] bcache: fix unmatched generic_end_io_acct() &
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generic_start_io_acct()
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Git-commit: b40503ea4f5c134b16ef405cab6c08f9343a0d06
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Patch-mainline: v4.16-rc1
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References: bsc#1093023
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The function cached_dev_make_request() and flash_dev_make_request() call
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generic_start_io_acct() with (struct bcache_device)->disk when they start a
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closure. Then the function bio_complete() calls generic_end_io_acct() with
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(struct search)->orig_bio->bi_disk when the closure has done.
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Since the `bi_disk` is not the bcache device, the generic_end_io_acct() is
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called with a wrong device queue.
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It causes the "inflight" (in struct hd_struct) counter keep increasing
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without decreasing.
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This patch fix the problem by calling generic_end_io_acct() with
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(struct bcache_device)->disk.
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Signed-off-by: Zhai Zhaoxuan <kxuanobj@gmail.com>
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Reviewed-by: Michael Lyle <mlyle@lyle.org>
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Reviewed-by: Coly Li <colyli@suse.de>
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Reviewed-by: Tang Junhui <tang.junhui@zte.com.cn>
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Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Signed-off-by: Coly Li <colyli@suse.de>
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---
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drivers/md/bcache/request.c | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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diff --git a/drivers/md/bcache/request.c b/drivers/md/bcache/request.c
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index ddd941056f3c..1a46b41dac70 100644
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--- a/drivers/md/bcache/request.c
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+++ b/drivers/md/bcache/request.c
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@@ -633,8 +633,8 @@ static void request_endio(struct bio *bio)
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static void bio_complete(struct search *s)
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{
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if (s->orig_bio) {
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- struct request_queue *q = s->orig_bio->bi_disk->queue;
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- generic_end_io_acct(q, bio_data_dir(s->orig_bio),
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+ generic_end_io_acct(s->d->disk->queue,
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+ bio_data_dir(s->orig_bio),
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&s->d->disk->part0, s->start_time);
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trace_bcache_request_end(s->d, s->orig_bio);
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--
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2.16.3
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