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Date:   Thu, 8 Oct 2020 14:13:02 -0600
From:   Andreas Dilger <adilger@...ger.ca>
To:     Jan Kara <jack@...e.cz>
Cc:     Ted Tso <tytso@....edu>, linux-ext4@...r.kernel.org,
        Fengnan Chang <changfengnan@...vision.com>,
        changfengnan <fengnanchang@...mail.com>
Subject: Re: [PATCH v4] jbd2: avoid transaction reuse after reformatting

On Oct 7, 2020, at 2:13 AM, Jan Kara <jack@...e.cz> wrote:
> 
> From: changfengnan <fengnanchang@...mail.com>
> 
> When ext4 is formatted with lazy_journal_init=1 and transactions from
> the previous filesystem are still on disk, it is possible that they are
> considered during a recovery after a crash. Because the checksum seed
> has changed, the CRC check will fail, and the journal recovery fails
> with checksum error although the journal is otherwise perfectly valid.
> Fix the problem by checking commit block time stamps to determine
> whether the data in the journal block is just stale or whether it is
> indeed corrupt.
> 
> Reported-by: kernel test robot <lkp@...el.com>
> Signed-off-by: Fengnan Chang <changfengnan@...vision.com>
> Signed-off-by: Jan Kara <jack@...e.cz>

Reviewed-by: Andreas Dilger <adilger@...ger.ca>

NB: one trivial formatting cleanup if patch is refreshed

> @@ -520,12 +522,22 @@ static int do_one_pass(journal_t *journal,
> 			if (descr_csum_size > 0 &&
> 			    !jbd2_descriptor_block_csum_verify(journal,
> 							       bh->b_data)) {
> -				printk(KERN_ERR "JBD2: Invalid checksum "
> -				       "recovering block %lu in log\n",
> -				       next_log_block);
> -				err = -EFSBADCRC;
> -				brelse(bh);
> -				goto failed;
> +				/*
> +				 * PASS_SCAN can see stale blocks due to lazy
> + 				 * journal init. Don't error out on those yet.
> +				 */
> +				if (pass != PASS_SCAN) {
> +					pr_err("JBD2: Invalid checksum "
> +					       "recovering block %lu in log\n",

(style) should keep console message strings on a single line


Cheers, Andreas






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