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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org,
	stable@vger.kernel.org
Cc: Zhang Yi <yi.zhang@huawei.com>,
	Jan Kara <jack@suse.cz>,
	Theodore Ts'o <tytso@mit.edu>,
	Sasha Levin <sashal@kernel.org>,
	adilger.kernel@dilger.ca,
	linux-ext4@vger.kernel.org
Subject: [PATCH AUTOSEL 5.15 14/34] ext4: add a hint for block bitmap corrupt state in mb_groups
Date: Fri, 29 Mar 2024 08:47:15 -0400
Message-ID: <20240329124750.3092394-14-sashal@kernel.org>
In-Reply-To: <20240329124750.3092394-1-sashal@kernel.org>
References: <20240329124750.3092394-1-sashal@kernel.org>
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From: Zhang Yi <yi.zhang@huawei.com>

[ Upstream commit 68ee261fb15457ecb17e3683cb4e6a4792ca5b71 ]

If one group is marked as block bitmap corrupted, its free blocks cannot
be used and its free count is also deducted from the global
sbi->s_freeclusters_counter. User might be confused about the absent
free space because we can't query the information about corrupted block
groups except unreliable error messages in syslog. So add a hint to show
block bitmap corrupted groups in mb_groups.

Signed-off-by: Zhang Yi <yi.zhang@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20240119061154.1525781-1-yi.zhang@huaweicloud.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/ext4/mballoc.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index a254c2ba03576..e670b5628ddfa 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -2950,7 +2950,10 @@ static int ext4_mb_seq_groups_show(struct seq_file *seq, void *v)
 	for (i = 0; i <= 13; i++)
 		seq_printf(seq, " %-5u", i <= blocksize_bits + 1 ?
 				sg.info.bb_counters[i] : 0);
-	seq_puts(seq, " ]\n");
+	seq_puts(seq, " ]");
+	if (EXT4_MB_GRP_BBITMAP_CORRUPT(&sg.info))
+		seq_puts(seq, " Block bitmap corrupted!");
+	seq_puts(seq, "\n");
 
 	return 0;
 }
-- 
2.43.0