linux-ext4 - Re: [PATCH 1/2] e2fsck: save EXT2_ERROR

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Date:   Fri, 17 Feb 2023 12:10:49 +0100
From:   Jan Kara <jack@...e.cz>
To:     Baokun Li <libaokun1@...wei.com>
Cc:     linux-ext4@...r.kernel.org, tytso@....edu,
        adilger.kernel@...ger.ca, jack@...e.cz, yi.zhang@...wei.com,
        yangerkun@...wei.com, yukuai3@...wei.com
Subject: Re: [PATCH 1/2] e2fsck: save EXT2_ERROR_FS flag during journal replay

On Fri 17-02-23 18:09:21, Baokun Li wrote:
> When repairing a file system with s_errno missing from the journal
> superblock but the file system superblock contains the ERROR_FS flag,
> the ERROR_FS flag on the file system image is overwritten after the
> journal replay, followed by a reload of the file system data from disk
> and the ERROR_FS flag in memory is overwritten. Also s_errno is not set
> and the ERROR_FS flag is not reset. Therefore, when checked later, no
> forced check is performed, which makes it possible to have some errors
> hidden in the disk image, which may make it read-only when using the
> file system. So we save the ERROR_FS flag to the superblock after the
> journal replay, instead of just relying on the jsb->s_errno to do this.
> 
> Signed-off-by: Baokun Li <libaokun1@...wei.com>

Looks good to me. Feel free to add:

Reviewed-by: Jan Kara <jack@...e.cz>

								Honza

> ---
>  e2fsck/journal.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/e2fsck/journal.c b/e2fsck/journal.c
> index c7868d89..0144aa45 100644
> --- a/e2fsck/journal.c
> +++ b/e2fsck/journal.c
> @@ -1683,6 +1683,7 @@ errcode_t e2fsck_run_ext3_journal(e2fsck_t ctx)
>  	errcode_t	retval, recover_retval;
>  	io_stats	stats = 0;
>  	unsigned long long kbytes_written = 0;
> +	__u16 s_error_state;
>  
>  	printf(_("%s: recovering journal\n"), ctx->device_name);
>  	if (ctx->options & E2F_OPT_READONLY) {
> @@ -1705,6 +1706,7 @@ errcode_t e2fsck_run_ext3_journal(e2fsck_t ctx)
>  		ctx->fs->io->manager->get_stats(ctx->fs->io, &stats);
>  	if (stats && stats->bytes_written)
>  		kbytes_written = stats->bytes_written >> 10;
> +	s_error_state = ctx->fs->super->s_state & EXT2_ERROR_FS;
>  
>  	ext2fs_mmp_stop(ctx->fs);
>  	ext2fs_free(ctx->fs);
> @@ -1721,6 +1723,7 @@ errcode_t e2fsck_run_ext3_journal(e2fsck_t ctx)
>  	ctx->fs->now = ctx->now;
>  	ctx->fs->flags |= EXT2_FLAG_MASTER_SB_ONLY;
>  	ctx->fs->super->s_kbytes_written += kbytes_written;
> +	ctx->fs->super->s_state |= s_error_state;
>  
>  	/* Set the superblock flags */
>  	e2fsck_clear_recover(ctx, recover_retval != 0);
> -- 
> 2.31.1
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR