linux-ext4 - Re: [PATCH, RFC] jbd2: Add commit time into the commit block

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Date:	Sun, 16 Mar 2008 09:23:31 +0800
From:	Andreas Dilger <adilger@....com>
To:	"Theodore Ts'o" <tytso@....edu>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: [PATCH, RFC] jbd2: Add commit time into the commit block

On Mar 15, 2008  20:59 -0400, Theodore Ts'o wrote:
> Carlo Wood has demonstrated that it's possible to recover deleted
> files from the journal.  Something that will make this easier is if we
> can put the time of the commit into commit block.
> 
> @@ -170,6 +170,8 @@ struct commit_header {
>  	unsigned char   h_chksum_size;
>  	unsigned char 	h_padding[2];
>  	__be32 		h_chksum[JBD2_CHECKSUM_BYTES];
> +	__be32		h_commit_sec;
> +	__be32		h_commit_nsec;
>  };

We should probably use a 64-bit seconds field, after we just told
someone on #ext4 that it would work until at least 2242 :-).

struct commit_header {
	unsigned char   h_chksum_size;
	unsigned char 	h_padding[2];
	__be32 		h_chksum[JBD2_CHECKSUM_BYTES];
	__be64		h_commit_sec;
	__be32		h_commit_nsec;
};

Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.

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