linux-ext4 - Re: [PATCH 23/39] fallthru: ext2 fallthru support

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Date:	Tue, 17 Aug 2010 17:08:32 -0400
From:	Valerie Aurora <vaurora@...hat.com>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	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 23/39] fallthru: ext2 fallthru support

On Fri, Aug 13, 2010 at 03:52:02PM +0200, Miklos Szeredi wrote:
> On Sun,  8 Aug 2010, Valerie Aurora wrote:
> > Add support for fallthru directory entries to ext2.
> 
> This still doesn't work correctly, only now after unmounting/mounting
> the top layer the directory appears empty:

Thanks, I will look into this.

-VAL

> uml:~# mount -oloop -r ext3.img /mnt/img/
> uml:~# losetup /dev/loop2  ovl.img  
> uml:~# /host/store/git/e2fsprogs/misc/mke2fs -O whiteout,fallthru /dev/loop2
> mke2fs 1.41.12 (17-May-2010)
> Filesystem label=
> OS type: Linux
> Block size=1024 (log=0)
> Fragment size=1024 (log=0)
> Stride=0 blocks, Stripe width=0 blocks
> 1280 inodes, 10240 blocks
> 512 blocks (5.00%) reserved for the super user
> First data block=1
> Maximum filesystem blocks=10485760
> 2 block groups
> 8192 blocks per group, 8192 fragments per group
> 640 inodes per group
> Superblock backups stored on blocks: 
>         8193
> 
> Allocating group tables: done                            
> Writing inode tables: done                            
> Writing superblocks and filesystem accounting information: done
> 
> This filesystem will be automatically checked every 24 mounts or
> 180 days, whichever comes first.  Use tune2fs -c or -i to override.
> uml:~# mmount -b 8 -t ext2 /dev/loop2 /mnt/img/
> uml:~# "ls" /mnt/img
> lost+found  union
> uml:~# "ls" /mnt/img/union
> 1  2  3
> uml:~# umount /mnt/img
> uml:~# mmount -b 8 -t ext2 /dev/loop2 /mnt/img/
> uml:~# ls -l /mnt/img/
> total 13
> drwx------ 2 root root 12288 Aug 13 13:42 lost+found
> drwxr-xr-x 2 root root  1024 Aug 13 13:42 union
> uml:~# ls -la /mnt/img/union/
> total 2
> drwxr-xr-x 2 root root 1024 Aug 13 13:42 .
> drwxr-xr-x 4 root root 1024 Aug 13 13:42 ..
> uml:~# grep /mnt/img /proc/self/mountinfo 
> 21 12 7:0 / /mnt/img ro,relatime - ext3 /dev/loop0 ro,errors=continue,barrier=0,data=writeback
> 22 21 7:2 / /mnt/img rw,relatime,union - ext2 /dev/loop2 rw,errors=continue
> 
> Thanks,
> Miklos
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