xfs
[Top] [All Lists]

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

To: Jeff Liu <jeff.liu@xxxxxxxxxx>
Subject: Re: [PATCH v2 1/2] xfstests: introduce 279 for SEEK_DATA/SEEK_HOLE sanity check
From: Dave Chinner <david@xxxxxxxxxxxxx>
Date: Fri, 10 Feb 2012 09:25:14 +1100
Cc: xfs@xxxxxxxxxxx, Christoph Hellwig <hch@xxxxxxxxxxxxx>, Mark Tinguely <tinguely@xxxxxxx>
In-reply-to: <4F33D7B9.6050803@xxxxxxxxxx>
References: <4F2FE40A.6050108@xxxxxxxxxx> <20120208054241.GH20305@dastard> <4F33D1B8.1050505@xxxxxxxxxx> <4F33D7B9.6050803@xxxxxxxxxx>
User-agent: Mutt/1.5.21 (2010-09-15)
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@xxxxxxxxxxxxx

<Prev in Thread] Current Thread [Next in Thread>