linux-kernel - [PATCH AUTOSEL 6.12 125/486] f2fs: defer readonly check vs norecovery

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Message-Id: <20250505223922.2682012-125-sashal@kernel.org>
Date: Mon,  5 May 2025 18:33:21 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Eric Sandeen <sandeen@...hat.com>,
	Chao Yu <chao@...nel.org>,
	Jaegeuk Kim <jaegeuk@...nel.org>,
	Sasha Levin <sashal@...nel.org>,
	linux-f2fs-devel@...ts.sourceforge.net
Subject: [PATCH AUTOSEL 6.12 125/486] f2fs: defer readonly check vs norecovery

From: Eric Sandeen <sandeen@...hat.com>

[ Upstream commit 9cca49875997a1a7e92800a828a62bacb0f577b9 ]

Defer the readonly-vs-norecovery check until after option parsing is done
so that option parsing does not require an active superblock for the test.
Add a helpful message, while we're at it.

(I think could be moved back into parsing after we switch to the new mount
API if desired, as the fs context will have RO state available.)

Signed-off-by: Eric Sandeen <sandeen@...hat.com>
Reviewed-by: Chao Yu <chao@...nel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/f2fs/super.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 573cc4725e2e8..280debf2df4f6 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -728,10 +728,8 @@ static int parse_options(struct super_block *sb, char *options, bool is_remount)
 			set_opt(sbi, DISABLE_ROLL_FORWARD);
 			break;
 		case Opt_norecovery:
-			/* this option mounts f2fs with ro */
+			/* requires ro mount, checked in f2fs_default_check */
 			set_opt(sbi, NORECOVERY);
-			if (!f2fs_readonly(sb))
-				return -EINVAL;
 			break;
 		case Opt_discard:
 			if (!f2fs_hw_support_discard(sbi)) {
@@ -1406,6 +1404,12 @@ static int parse_options(struct super_block *sb, char *options, bool is_remount)
 		f2fs_err(sbi, "Allow to mount readonly mode only");
 		return -EROFS;
 	}
+
+	if (test_opt(sbi, NORECOVERY) && !f2fs_readonly(sbi->sb)) {
+		f2fs_err(sbi, "norecovery requires readonly mount");
+		return -EINVAL;
+	}
+
 	return 0;
 }
 
-- 
2.39.5