linux-kernel - [PATCH 2/3] ext4: WANR_ON when detect abnormal 'i_reserved_data

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Date:   Thu, 17 Nov 2022 09:42:45 +0800
From:   Ye Bin <yebin@...weicloud.com>
To:     tytso@....edu, adilger.kernel@...ger.ca, linux-ext4@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, jack@...e.cz,
        Ye Bin <yebin10@...wei.com>
Subject: [PATCH 2/3] ext4: WANR_ON when detect abnormal 'i_reserved_data_blocks'

From: Ye Bin <yebin10@...wei.com>

If 'i_reserved_data_blocks' is not cleared which mean something wrong
with code, so emit WARN_ON to capture this abnormal closer to the first
scene.

Signed-off-by: Ye Bin <yebin10@...wei.com>
---
 fs/ext4/super.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 63ef74eb8091..30885a6fe18b 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -1385,11 +1385,14 @@ static void ext4_destroy_inode(struct inode *inode)
 		dump_stack();
 	}
 
-	if (EXT4_I(inode)->i_reserved_data_blocks)
-		ext4_msg(inode->i_sb, KERN_ERR,
-			 "Inode %lu (%p): i_reserved_data_blocks (%u) not cleared!",
-			 inode->i_ino, EXT4_I(inode),
-			 EXT4_I(inode)->i_reserved_data_blocks);
+	if (EXT4_I(inode)->i_reserved_data_blocks) {
+		ext4_warning(inode->i_sb, "Inode %lu (%p): "
+			    "i_reserved_data_blocks (%u) not cleared!",
+			     inode->i_ino, EXT4_I(inode),
+			     EXT4_I(inode)->i_reserved_data_blocks);
+
+		WARN_ON(1);
+	}
 }
 
 static void init_once(void *foo)
-- 
2.31.1