linux-kernel - [PATCH] bcache: fix cache miss's issue

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Message-Id: <20210627071817.24296-1-chiang.bai@gmail.com>
Date:   Sun, 27 Jun 2021 15:18:17 +0800
From:   Qiang Bai <chiang.bai@...il.com>
To:     colyli@...e.de, kent.overstreet@...il.com
Cc:     linux-bcache@...r.kernel.org, linux-kernel@...r.kernel.org,
        Qiang Bai <chiang.bai@...il.com>
Subject: [PATCH] bcache: fix cache miss's issue

when cache miss's IO was done, it needs to continue the left part of IO,
not return -EINTR. -EINTR will stop the whole btree recurse.

Signed-off-by: Qiang Bai <chiang.bai@...il.com>
---
 drivers/md/bcache/request.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/md/bcache/request.c b/drivers/md/bcache/request.c
index 29c231758293..b6ff101d2611 100644
--- a/drivers/md/bcache/request.c
+++ b/drivers/md/bcache/request.c
@@ -914,7 +914,7 @@ static int cached_dev_cache_miss(struct btree *b, struct search *s,
 	miss = bio_next_split(bio, sectors, GFP_NOIO, &s->d->bio_split);
 
 	/* btree_search_recurse()'s btree iterator is no good anymore */
-	ret = miss == bio ? MAP_DONE : -EINTR;
+	ret = miss == bio ? MAP_DONE : MAP_CONTINUE;
 
 	cache_bio = bio_alloc_bioset(GFP_NOWAIT,
 			DIV_ROUND_UP(s->insert_bio_sectors, PAGE_SECTORS),
-- 
2.31.1