linux-kernel - [PATCH 1/4] badblocks: goto out if find any unacked badblocks in _badblocks

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Message-Id: <20231223063728.3229446-2-linan666@huaweicloud.com>
Date: Sat, 23 Dec 2023 14:37:25 +0800
From: linan666@...weicloud.com
To: axboe@...nel.dk,
	geliang.tang@...e.com,
	xni@...hat.com,
	colyli@...e.de
Cc: ira.weiny@...el.com,
	linux-block@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linan666@...weicloud.com,
	yukuai3@...wei.com,
	yi.zhang@...wei.com,
	houtao1@...wei.com,
	yangerkun@...wei.com
Subject: [PATCH 1/4] badblocks: goto out if find any unacked badblocks in _badblocks_check()

From: Li Nan <linan122@...wei.com>

In _badblocks_check(), after finding any unacked badblocks, the return
value, 'first_bad' and 'bad_sectors' will not be changed anymore, and
there is no need to check other ranges. So goto out directly after
finding unacked badblocks.

Signed-off-by: Li Nan <linan122@...wei.com>
---
 block/badblocks.c | 27 ++++++++++++++-------------
 1 file changed, 14 insertions(+), 13 deletions(-)

diff --git a/block/badblocks.c b/block/badblocks.c
index fc92d4e18aa3..ebf17a54851a 100644
--- a/block/badblocks.c
+++ b/block/badblocks.c
@@ -1274,7 +1274,7 @@ static int _badblocks_clear(struct badblocks *bb, sector_t s, int sectors)
 static int _badblocks_check(struct badblocks *bb, sector_t s, int sectors,
 			    sector_t *first_bad, int *bad_sectors)
 {
-	int unacked_badblocks, acked_badblocks;
+	int acked_badblocks;
 	int prev = -1, hint = -1, set = 0;
 	struct badblocks_context bad;
 	unsigned int seq;
@@ -1297,7 +1297,6 @@ static int _badblocks_check(struct badblocks *bb, sector_t s, int sectors,
 	seq = read_seqbegin(&bb->lock);
 
 	p = bb->page;
-	unacked_badblocks = 0;
 	acked_badblocks = 0;
 
 re_check:
@@ -1318,21 +1317,24 @@ static int _badblocks_check(struct badblocks *bb, sector_t s, int sectors,
 	}
 
 	if (overlap_front(bb, prev, &bad)) {
-		if (BB_ACK(p[prev]))
+		if (set == 0) {
+			*first_bad = BB_OFFSET(p[prev]);
+			*bad_sectors = BB_LEN(p[prev]);
+			set = 1;
+		}
+
+		if (BB_ACK(p[prev])) {
 			acked_badblocks++;
-		else
-			unacked_badblocks++;
+		} else {
+			rv = -1;
+			goto out;
+		}
 
 		if (BB_END(p[prev]) >= (s + sectors))
 			len = sectors;
 		else
 			len = BB_END(p[prev]) - s;
 
-		if (set == 0) {
-			*first_bad = BB_OFFSET(p[prev]);
-			*bad_sectors = BB_LEN(p[prev]);
-			set = 1;
-		}
 		goto update_sectors;
 	}
 
@@ -1355,13 +1357,12 @@ static int _badblocks_check(struct badblocks *bb, sector_t s, int sectors,
 
 	WARN_ON(sectors < 0);
 
-	if (unacked_badblocks > 0)
-		rv = -1;
-	else if (acked_badblocks > 0)
+	if (acked_badblocks > 0)
 		rv = 1;
 	else
 		rv = 0;
 
+out:
 	if (read_seqretry(&bb->lock, seq))
 		goto retry;
 
-- 
2.39.2