From: Chao Yu <yuchao0@huawei.com>
Date: Mon, 22 Feb 2021 10:07:33 +0000 (+0800)
Subject: f2fs: check discard command number before traversing discard pending list
X-Git-Tag: v5.13-rc1~53^2~40
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=43f8c47ea7d59c7b2270835f1d7c4618a1ea27b6;p=thirdparty%2Fkernel%2Flinux.git

f2fs: check discard command number before traversing discard pending list

In trim thread, let's add a condition to check discard command number
before traversing discard pending list, it can avoid unneeded traversing
if there is no discard command.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
---

diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 29403540ff6ed..b5a40a39a03fb 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -1759,6 +1759,8 @@ static int issue_discard_thread(void *data)
 			wait_ms = dpolicy.max_interval;
 			continue;
 		}
+		if (!atomic_read(&dcc->discard_cmd_cnt))
+			continue;
 
 		if (sbi->gc_mode == GC_URGENT_HIGH)
 			__init_discard_policy(sbi, &dpolicy, DPOLICY_FORCE, 1);