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Message-Id: <20250505225634.2688578-62-sashal@kernel.org>
Date: Mon, 5 May 2025 18:52:42 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
stable@...r.kernel.org
Cc: Jan Kara <jack@...e.cz>,
Zhang Yi <yi.zhang@...wei.com>,
Theodore Ts'o <tytso@....edu>,
Sasha Levin <sashal@...nel.org>,
jack@...e.com,
linux-ext4@...r.kernel.org
Subject: [PATCH AUTOSEL 6.6 062/294] jbd2: do not try to recover wiped journal
From: Jan Kara <jack@...e.cz>
[ Upstream commit a662f3c03b754e1f97a2781fa242e95bdb139798 ]
If a journal is wiped, we will set journal->j_tail to 0. However if
'write' argument is not set (as it happens for read-only device or for
ocfs2), the on-disk superblock is not updated accordingly and thus
jbd2_journal_recover() cat try to recover the wiped journal. Fix the
check in jbd2_journal_recover() to use journal->j_tail for checking
empty journal instead.
Signed-off-by: Jan Kara <jack@...e.cz>
Reviewed-by: Zhang Yi <yi.zhang@...wei.com>
Link: https://patch.msgid.link/20250206094657.20865-4-jack@suse.cz
Signed-off-by: Theodore Ts'o <tytso@....edu>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
fs/jbd2/recovery.c | 11 ++++++-----
1 file changed, 6 insertions(+), 5 deletions(-)
diff --git a/fs/jbd2/recovery.c b/fs/jbd2/recovery.c
index 421c0d360836e..19ec325374833 100644
--- a/fs/jbd2/recovery.c
+++ b/fs/jbd2/recovery.c
@@ -286,21 +286,22 @@ static int fc_do_one_pass(journal_t *journal,
int jbd2_journal_recover(journal_t *journal)
{
int err, err2;
- journal_superblock_t * sb;
-
struct recovery_info info;
errseq_t wb_err;
struct address_space *mapping;
memset(&info, 0, sizeof(info));
- sb = journal->j_superblock;
/*
* The journal superblock's s_start field (the current log head)
* is always zero if, and only if, the journal was cleanly
- * unmounted.
+ * unmounted. We use its in-memory version j_tail here because
+ * jbd2_journal_wipe() could have updated it without updating journal
+ * superblock.
*/
- if (!sb->s_start) {
+ if (!journal->j_tail) {
+ journal_superblock_t *sb = journal->j_superblock;
+
jbd2_debug(1, "No recovery required, last transaction %d, head block %u\n",
be32_to_cpu(sb->s_sequence), be32_to_cpu(sb->s_head));
journal->j_transaction_sequence = be32_to_cpu(sb->s_sequence) + 1;
--
2.39.5
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