linux-kernel - [PATCH v2 2/8] ext4: do not trim the group with corrupted block bitmap

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Message-ID: <20231221150558.2740823-3-libaokun1@huawei.com>
Date: Thu, 21 Dec 2023 23:05:52 +0800
From: Baokun Li <libaokun1@...wei.com>
To: <linux-ext4@...r.kernel.org>
CC: <tytso@....edu>, <adilger.kernel@...ger.ca>, <jack@...e.cz>,
	<ritesh.list@...il.com>, <linux-kernel@...r.kernel.org>,
	<yi.zhang@...wei.com>, <yangerkun@...wei.com>, <yukuai3@...wei.com>,
	<libaokun1@...wei.com>
Subject: [PATCH v2 2/8] ext4: do not trim the group with corrupted block bitmap

Otherwise operating on an incorrupted block bitmap can lead to all sorts
of unknown problems.

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

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index d72b5e3c92ec..a95fa6e2b0f9 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -6757,6 +6757,9 @@ __releases(ext4_group_lock_ptr(sb, e4b->bd_group))
 	bool set_trimmed = false;
 	void *bitmap;
 
+	if (unlikely(EXT4_MB_GRP_BBITMAP_CORRUPT(e4b->bd_info)))
+		return 0;
+
 	bitmap = e4b->bd_bitmap;
 	if (start == 0 && max >= ext4_last_grp_cluster(sb, e4b->bd_group))
 		set_trimmed = true;
-- 
2.31.1