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@xxxxxxx>
---
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 9192be7c19d8..23502f1a67c1 100644
--- a/fs/jbd2/recovery.c
+++ b/fs/jbd2/recovery.c
@@ -287,19 +287,20 @@ 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;
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;
--
2.43.0
