linux-ext4 - Re: [patch] e4defrag: relevant file fragmentation with base

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Date:	Wed, 01 Sep 2010 17:30:13 +0900
From:	Kazuya Mio <k-mio@...jp.nec.com>
To:	Andreas Rid <andreas@...-net.de>
CC:	ext4 <linux-ext4@...r.kernel.org>
Subject: Re: [patch] e4defrag: relevant file fragmentation with base_file

2010/08/30 4:47, Andreas Rid wrote:
> @@ -2327,8 +2320,44 @@ int main(int argc, char *argv[])
>   			} else
>   				printf("ext4 defragmentation for %s\n",
>   								 argv[i]);
> -			/* Defrag single file process */
> -			file_defrag(argv[i],&buf, FTW_F, NULL);
> +
> +			if (mode_flag&  RELEVANT&&  i == optind) {
> +				if (i - argc == 1)
> +					/* not enought arguemnts */
> +					goto out;

I think this condition should be "argc - optind == 1" because "i" is smaller
than argc at all times.

> +					goto out;
> +				}
> +				
> +				r_pstart = get_physical_offset(fd,&ret);

If e4defrag is executed with the following arguments, e4defrag will move the
extents of "move_file" near the "directory".
# e4defrag -r base_file directory move_file

To prevent this case, r_pstart should not be changed even if directories or
devices are set to the argument of e4defrag after the physical block number of
the "base_file" was assigned to r_pstart.

I will fix your patch in above way. Any comments?

Regards,
Kazuya Mio

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