Re: [PATCH v2 1/2] xfstests: introduce 279 for SEEK_DATA/SEEK_HOLE sanity check

From: Dave Chinner <david@fromorbit.com>
To: Jeff Liu <jeff.liu@oracle.com>
Cc: Christoph Hellwig <hch@infradead.org>,
	Mark Tinguely <tinguely@sgi.com>,
	xfs@oss.sgi.com
Subject: Re: [PATCH v2 1/2] xfstests: introduce 279 for SEEK_DATA/SEEK_HOLE sanity check
Date: Fri, 10 Feb 2012 09:25:14 +1100	[thread overview]
Message-ID: <20120209222514.GH7479@dastard> (raw)
In-Reply-To: <4F33D7B9.6050803@oracle.com>

On Thu, Feb 09, 2012 at 10:27:05PM +0800, Jeff Liu wrote:
> Strange, I also tried to build XFS with 2k which shown as following:
> 
> $ sudo mkfs.xfs -b size=2k -n size=2k -f /dev/sda7
> 
> $ xfs_info /dev/sda7
> meta-data=/dev/sda7              isize=256    agcount=4, agsize=1418736 blks
>          =                       sectsz=512   attr=2
> data     =                       bsize=2048   blocks=5674944, imaxpct=25
                                   ^^^^^^^^^^

>          =                       sunit=0      swidth=0 blks
> naming   =version 2              bsize=2048   ascii-ci=0
                                   ^^^^^^^^^^

> log      =internal               bsize=2048   blocks=5120, version=2
                                   ^^^^^^^^^^
The block size for data, metadata, directories and the log is 2k,
just like you asked.

>          =                       sectsz=512   sunit=0 blks, lazy-count=1
> realtime =none                   extsz=4096   blocks=0, rtextents=0

For the non-existent realtime device, the default is an extent size
of 4k.  However, extent size for the real time device is separate
from the data/log device block size - it's more like the bigalloc
ext4 functionality in that it defines the default extent allocation
size and alignment for the RT device.

Cheers,

Dave.
-- 
Dave Chinner
david@fromorbit.com

_______________________________________________
xfs mailing list
xfs@oss.sgi.com
http://oss.sgi.com/mailman/listinfo/xfs