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Commit fec039ec authored by Tang Junhui's avatar Tang Junhui Committed by Greg Kroah-Hartman
Browse files

bcache: trace missed reading by cache_missed 



commit 502b291568fc7faf1ebdb2c2590f12851db0ff76 upstream.

Missed reading IOs are identified by s->cache_missed, not the
s->cache_miss, so in trace_bcache_read() using trace_bcache_read
to identify whether the IO is missed or not.

Signed-off-by: default avatarTang Junhui <tang.junhui.linux@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: default avatarColy Li <colyli@suse.de>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 95e124ad

drivers/md/bcache/request.c

+1 −1
Original line number Diff line number Diff line
@@ -850,7 +850,7 @@ static void cached_dev_read_done_bh(struct closure *cl) 


	bch_mark_cache_accounting(s->iop.c, s->d,

				  !s->cache_missed, s->iop.bypass);

	trace_bcache_read(s->orig_bio, !s->cache_miss, s->iop.bypass);

	trace_bcache_read(s->orig_bio, !s->cache_missed, s->iop.bypass);



	if (s->iop.status)

		continue_at_nobarrier(cl, cached_dev_read_error, bcache_wq);