linux-kernel - [PATCH v2 7/7] ext4: show 'shutdown' hint when ext4 is forced to shutdown

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Message-Id: <20250122114130.229709-8-libaokun@huaweicloud.com>
Date: Wed, 22 Jan 2025 19:41:30 +0800
From: libaokun@...weicloud.com
To: linux-ext4@...r.kernel.org
Cc: tytso@....edu,
	adilger.kernel@...ger.ca,
	jack@...e.cz,
	linux-kernel@...r.kernel.org,
	yi.zhang@...wei.com,
	yangerkun@...wei.com,
	libaokun@...weicloud.com,
	Baokun Li <libaokun1@...wei.com>
Subject: [PATCH v2 7/7] ext4: show 'shutdown' hint when ext4 is forced to shutdown

From: Baokun Li <libaokun1@...wei.com>

Now, if dmesg is cleared, we have no way of knowing if the file system has
been shutdown. Moreover, ext4 allows directory reads even after the file
system has been shutdown, so when reading a file returns -EIO, we cannot
determine whether this is a hardware issue or if the file system has been
shutdown.

Therefore, when ext4 file system is shutdown, we're adding a 'shutdown'
hint to commands like mount so users can easily check the file system's
status.

Signed-off-by: Baokun Li <libaokun1@...wei.com>
Reviewed-by: Jan Kara <jack@...e.cz>
Reviewed-by: Zhang Yi <yi.zhang@...wei.com>
---
 fs/ext4/super.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 06633d23d8b2..7455e2559bc0 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -3047,6 +3047,9 @@ static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
 	if (ext4_emergency_ro(sb))
 		SEQ_OPTS_PUTS("emergency_ro");
 
+	if (ext4_forced_shutdown(sb))
+		SEQ_OPTS_PUTS("shutdown");
+
 	ext4_show_quota_options(seq, sb);
 	return 0;
 }
-- 
2.39.2