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Date: Fri, 19 Aug 2022 16:00:13 +0800 From: yebin <yebin10@...wei.com> To: <tytso@....edu>, <adilger.kernel@...ger.ca>, <linux-ext4@...r.kernel.org> CC: <linux-kernel@...r.kernel.org>, <jack@...e.cz> Subject: Re: [PATCH RFC] jbd2: detect old record when do journal scan ping... On 2022/8/10 9:34, Ye Bin wrote: > As https://github.com/tytso/e2fsprogs/issues/120 describe tune2fs do not update > j_tail_sequence when do journal recovery. This maybe recover old journal record, > then will lead to file system corruption. > To avoid file system corruption in this case, if detect current transaction's > commit time earlier than previous transaction's commit time when do journal > scan, just return error. > > Signed-off-by: Ye Bin <yebin10@...wei.com> > --- > fs/jbd2/recovery.c | 11 ++++++++++- > 1 file changed, 10 insertions(+), 1 deletion(-) > > diff --git a/fs/jbd2/recovery.c b/fs/jbd2/recovery.c > index f548479615c6..f3def21a96a5 100644 > --- a/fs/jbd2/recovery.c > +++ b/fs/jbd2/recovery.c > @@ -812,8 +812,17 @@ static int do_one_pass(journal_t *journal, > break; > } > } > - if (pass == PASS_SCAN) > + if (pass == PASS_SCAN) { > + if (commit_time < last_trans_commit_time) { > + pr_err("JBD2: old journal record found " > + "in transaction %u\n", > + next_commit_ID); > + err = -EFSBADCRC; > + brelse(bh); > + goto failed; > + } > last_trans_commit_time = commit_time; > + } > brelse(bh); > next_commit_ID++; > continue;
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