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From: Vivek Goyal <vgoyal@redhat.com>
Subject: Re: [ANNOUNCE] unionmount-testsuite: Amir's master branch updated
Date: Mon, 11 Dec 2017 15:59:12 -0500
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To: Amir Goldstein <amir73il@gmail.com>
Cc: overlayfs <linux-unionfs@vger.kernel.org>, Miklos Szeredi <miklos@szeredi.hu>, David Howells <dhowells@redhat.com>, fstests <fstests@vger.kernel.org>, Chandan Rajendra <chandan@linux.vnet.ibm.com>

On Mon, Dec 11, 2017 at 10:47:15PM +0200, Amir Goldstein wrote:

[..]
> > - For the xfs reflink test, I am curious that why have you recommended
> >   to also enabled "rmapbt=1". Is is required for the tests?
> >
> 
> You cannot enable reflink=1 without it.

I could do that. Here is the xfs_info output which shows rmapbt=0 and
reflink=1.

# xfs_info /mnt/test-xfs
meta-data=/dev/mapper/test--union-lower_layer isize=512    agcount=4, agsize=327680 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=1 spinodes=0 rmapbt=0
         =                       reflink=1
data     =                       bsize=4096   blocks=1310720, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
log      =internal               bsize=4096   blocks=2560, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0

Vivek