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

[Dave Chinner]

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 at fromorbit.com