linux-ext4 - Re: [PATCH] e4defrag: Handle device symlinks

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Date:	Sat, 28 Jul 2012 17:54:09 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Eric Sandeen <sandeen@...hat.com>
Cc:	ext4 development <linux-ext4@...r.kernel.org>,
	Kazuya Mio <k-mio@...jp.nec.com>
Subject: Re: [PATCH] e4defrag: Handle device symlinks

On Thu, Jul 19, 2012 at 02:02:30PM -0500, Eric Sandeen wrote:
> Device nodes are commonly accessed via symlinks, i.e.
> 
> # ls -l /dev/mapper/testvg-testlv 
> lrwxrwxrwx. 1 root root 7 Jul 19 13:01 /dev/mapper/testvg-testlv -> ../dm-0
> 
> Today, e4defrag on such a device will fail:
> 
> # e4defrag -c /dev/mapper/testvg-testlv 
> File is not regular file
>  "/dev/mapper/testvg-testlv"
> 
> due to it being a link, and e4defrag on the link target does as well:
> 
> # e4defrag -c /dev/dm-0 
> Filesystem is not mounted
> 
> due to the target not being found in /etc/mtab.
> 
> Fix this by checking whether the symlink target is a block device
> and if so, using that device in main(), and also changing get_mount_point()
> to search for a matching device number, not device name.
> 
> Signed-off-by: Eric Sandeen <sandeen@...hat.com>

Thanks, applied.

					- Ted
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