linux-kernel - Re: [PATCH 14/38] fallthru: ext2 fallthru support

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Message-Id: <E1Ogxol-0002xs-De@pomaz-ex.szeredi.hu>
Date:	Thu, 05 Aug 2010 12:36:55 +0200
From:	Miklos Szeredi <miklos@...redi.hu>
To:	Valerie Aurora <vaurora@...hat.com>
CC:	miklos@...redi.hu, viro@...iv.linux.org.uk, jblunck@...e.de,
	hch@...radead.org, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, tytso@....edu,
	linux-ext4@...r.kernel.org
Subject: Re: [PATCH 14/38] fallthru: ext2 fallthru support

On Wed, 4 Aug 2010, Valerie Aurora wrote:
> --zYM0uCDKw75PZbzx
> Content-Type: text/plain; charset=us-ascii
> Content-Disposition: inline
> 
> On Wed, Aug 04, 2010 at 04:44:10PM +0200, Miklos Szeredi wrote:
> > On Tue, 15 Jun 2010, Valerie Aurora wrote:
> > > Add support for fallthru directory entries to ext2.
> > 
> > If a previously used ext2 filesystem with is mounted again then
> > fallthroughs don't appear to work as expected.  Stat returns ENOENT
> > for these entries.
> > 
> > Can't see anything obviously wrong with the code.
> 
> Hm, I wrote one test case for this that worked (attached).  Can you
> give me more details on your test case?  Thanks,

uml:~# mount -oloop -r ext3-2.img /mnt/img/
uml:~# mount -oloop -r ext3.img /mnt/img/
uml:~# losetup -f ovl.img 
uml:~# mmount -b 8 -t ext2 /dev/loop2 /mnt/img/
uml:~# "ls" /mnt/img
bunion  lost+found  union
uml:~# "ls" /mnt/img/union
1  2  3
uml:~# "ls" /mnt/img/union/1
a  x
uml:~# umount /mnt/img/
uml:~# mmount -b 8 -t ext2 /dev/loop2 /mnt/img/
uml:~# ls -l /mnt/img/  
total 14
drwxr-xr-x 2 root root  1024 Aug  5 09:56 bunion
drwx------ 2 root root 12288 Aug  5 09:41 lost+found
drwxr-xr-x 3 root root  1024 Aug  5 09:56 union
uml:~# ls -l /mnt/img/union/
ls: cannot access /mnt/img/union/3: No such file or directory
ls: cannot access /mnt/img/union/2: No such file or directory
total 1
drwxr-xr-x 2 root root 1024 Aug  5 09:56 1
?????????? ? ?    ?       ?            ? 2
?????????? ? ?    ?       ?            ? 3
uml:~# ls -l /mnt/img/union/1
ls: cannot access /mnt/img/union/1/a: No such file or directory
ls: cannot access /mnt/img/union/1/x: No such file or directory
total 0
?????????? ? ? ? ?            ? a
?????????? ? ? ? ?            ? x
uml:~# 

Thanks,
Miklos
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