From: Jan Kara Date: Thu, 6 Feb 2025 09:46:59 +0000 (+0100) Subject: jbd2: do not try to recover wiped journal X-Git-Tag: v6.15-rc1~145^2~20 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a662f3c03b754e1f97a2781fa242e95bdb139798;p=thirdparty%2Fkernel%2Flinux.git jbd2: do not try to recover wiped journal 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 Reviewed-by: Zhang Yi Link: https://patch.msgid.link/20250206094657.20865-4-jack@suse.cz Signed-off-by: Theodore Ts'o --- diff --git a/fs/jbd2/recovery.c b/fs/jbd2/recovery.c index 38a89a3310b24..c271a050b7e6f 100644 --- a/fs/jbd2/recovery.c +++ b/fs/jbd2/recovery.c @@ -282,19 +282,20 @@ 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;