linux-kernel - [PATCH] f2fs: issue discard when discard_cmd_cnt is not 0 in f2fs_put

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Message-Id: <20221129134018.34120-1-frank.li@vivo.com>
Date:   Tue, 29 Nov 2022 21:40:18 +0800
From:   Yangtao Li <frank.li@...o.com>
To:     jaegeuk@...nel.org, chao@...nel.org
Cc:     linux-f2fs-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org, Yangtao Li <frank.li@...o.com>
Subject: [PATCH] f2fs: issue discard when discard_cmd_cnt is not 0 in f2fs_put_super()

No need to call f2fs_issue_discard_timeout() in f2fs_put_super,
when no discard command requires issue. Since the caller of
f2fs_issue_discard_timeout() usually judges the number of discard
commands before using it. Let's move this logic to
f2fs_issue_discard_timeout().

By the way, use f2fs_realtime_discard_enable to simplify the code.

Signed-off-by: Yangtao Li <frank.li@...o.com>
---
 fs/f2fs/segment.c | 6 ++++--
 fs/f2fs/super.c   | 6 ++----
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 9486ca49ecb1..d5f150a08285 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -1655,6 +1655,9 @@ bool f2fs_issue_discard_timeout(struct f2fs_sb_info *sbi)
 	struct discard_policy dpolicy;
 	bool dropped;
 
+	if (!atomic_read(&dcc->discard_cmd_cnt))
+		return false;
+
 	__init_discard_policy(sbi, &dpolicy, DPOLICY_UMOUNT,
 					dcc->discard_granularity);
 	__issue_discard_cmd(sbi, &dpolicy);
@@ -2110,8 +2113,7 @@ static void destroy_discard_cmd_control(struct f2fs_sb_info *sbi)
 	 * Recovery can cache discard commands, so in error path of
 	 * fill_super(), it needs to give a chance to handle them.
 	 */
-	if (unlikely(atomic_read(&dcc->discard_cmd_cnt)))
-		f2fs_issue_discard_timeout(sbi);
+	f2fs_issue_discard_timeout(sbi);
 
 	kfree(dcc);
 	SM_I(sbi)->dcc_info = NULL;
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 79bf1faf4161..71e6b2bea1f4 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -1576,8 +1576,7 @@ static void f2fs_put_super(struct super_block *sb)
 	/* be sure to wait for any on-going discard commands */
 	dropped = f2fs_issue_discard_timeout(sbi);
 
-	if ((f2fs_hw_support_discard(sbi) || f2fs_hw_should_discard(sbi)) &&
-					!sbi->discard_blks && !dropped) {
+	if (f2fs_realtime_discard_enable(sbi) && !sbi->discard_blks && !dropped) {
 		struct cp_control cpc = {
 			.reason = CP_UMOUNT | CP_TRIMMED,
 		};
@@ -2408,8 +2407,7 @@ static int f2fs_remount(struct super_block *sb, int *flags, char *data)
 		} else {
 			dcc = SM_I(sbi)->dcc_info;
 			f2fs_stop_discard_thread(sbi);
-			if (atomic_read(&dcc->discard_cmd_cnt))
-				f2fs_issue_discard_timeout(sbi);
+			f2fs_issue_discard_timeout(sbi);
 			need_restart_discard = true;
 		}
 	}
-- 
2.25.1