Re: Possible bug in send/receive with simple reproducer

[Josef Bacik <jbacik@fusionio.com>]

On Sun, Aug 11, 2013 at 09:53:01PM +0300, Emil Karlson wrote:
> Greetings
> 
> Send fails for me unexpectedly:
> 
> I get:
> ERROR: rename o262-5-0 -> snapshots failed. No such file or directory
> 
> reproducer ( http://users.tkk.fi/~jkarlson/files/test4.txt  ):
> 
> for i in 1 2; do
>   mkdir /mnt/$i
>   truncate -s 4G /mnt/$i.img
>   mkfs.btrfs /mnt/$i.img
>   mount -o loop /mnt/$i.img /mnt/$i
> done
> 
> mkdir /mnt/1/testdir
> mkdir /mnt/1/testdir/1/
> mkdir /mnt/1/testdir/2/
> dd if=/dev/urandom  of=/mnt/1/testdir/aa count=16
> dd if=/dev/urandom  of=/mnt/1/testdir/bb count=16
> 
> mkdir /mnt/1/snapshots
> btrfs sub snap -r /mnt/1/ /mnt/1/snapshots/backup2
> btrfs sub snap -r /mnt/1/ /mnt/1/snapshots/backup3
> btrfs send /mnt/1/snapshots/backup3/ | btrfs receive /mnt/2/
> 
> umount /mnt/{1,2}; rm /mnt/{1,2}.img; rmdir /mnt/{1,2}

This was perfect, thank you for that.  I've posted a fix and I'll turn this into
an xfstest to make sure we don't ever regress.  Thanks again,

Josef