linux-kernel - Re: [fstests PATCH v3] generic: add test for DAX MAP

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Message-ID: <20171116213147.GB27448@linux.intel.com>
Date:   Thu, 16 Nov 2017 14:31:47 -0700
From:   Ross Zwisler <ross.zwisler@...ux.intel.com>
To:     Ross Zwisler <ross.zwisler@...ux.intel.com>,
        Dave Chinner <david@...morbit.com>,
        Amir Goldstein <amir73il@...il.com>,
        Josef Bacik <jbacik@...com>, Eryu Guan <eguan@...hat.com>,
        fstests <fstests@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Alasdair Kergon <agk@...hat.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Jan Kara <jack@...e.cz>, Mike Snitzer <snitzer@...hat.com>,
        Shaohua Li <shli@...nel.org>, dm-devel@...hat.com,
        linux-nvdimm@...ts.01.org, linux-raid@...r.kernel.org,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Ext4 <linux-ext4@...r.kernel.org>,
        linux-xfs <linux-xfs@...r.kernel.org>,
        Christoph Hellwig <hch@...radead.org>
Subject: Re: [fstests PATCH v3] generic: add test for DAX MAP_SYNC support

On Thu, Nov 16, 2017 at 02:28:15PM -0700, Ross Zwisler wrote:
> On Thu, Oct 26, 2017 at 08:56:38AM +1100, Dave Chinner wrote:
> > Perhaps stat -c %b $SCRATCH_MNT/test ?
> 
> Maybe, but doesn't the output of 'stat -c %b' depend on the block size the
> filesystem is using?  I think to use stat I'd have to check both %b and %B,
> and account for different block sizes, or do some shell math.  I think it may
> be easier to just use du.

Ah, never mind, I think you meant 'stat -c %s' - that's cleaner, will switch.