Thread (5 messages) 5 messages, 3 authors, 2018-01-03

Re: [PATCH] bcache: fix unmatched generic_end_io_acct() & generic_start_io_acct()

From: Coly Li <hidden>
Date: 2018-01-03 05:46:14
Also in: linux-bcache

On 03/01/2018 12:39 PM, Zhai Zhaoxuan wrote:
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 <redacted>
Hi Zhaoxuan,

Nice catch, it makes sense. Thanks.

Reviewed-by: Coly Li <redacted>

One more question, do you experience any problem when inflight counter
increases only ? I just wondering.

Coly
quoted hunk ↗ jump to hunk
---
 drivers/md/bcache/request.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/md/bcache/request.c b/drivers/md/bcache/request.c
index 643c3021624f..83de85fe4542 100644
--- a/drivers/md/bcache/request.c
+++ b/drivers/md/bcache/request.c
@@ -611,8 +611,8 @@ 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);
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