how to create file without using extent allocation

[Akshay Nehe]

Thanks for help, i find it useful.

On 3/22/12, Vlad Dogaru <ddvlad at rosedu.org> wrote:
> On Thu, Mar 22, 2012 at 3:31 PM, Akshay Nehe <akshaynehe785 at gmail.com>
> wrote:
>> Hello,
>>
>> Can we create file on ext4 file system which dose not uses extent
>> allocation?
>
> Man page of mkfs.ext4 suggests using "-O ^feature" to disable an ext4
> feature.  This seems to work:
>
> $ dd if=/dev/zero of=test1 bs=4M count=20
> [...]
> $ mkfs.ext4 -F test1
> [...]
> $ file test1
> test1: Linux rev 1.0 ext4 filesystem data,
> UUID=408f6da2-c4ef-4335-9574-985f3a349ed2 (extents) (huge files)
>
> $ mkfs -O ^extent -F test1
> [...]
> $ file test1
> test1: Linux rev 1.0 ext4 filesystem data,
> UUID=23c046d6-db7a-419d-a1d5-0cba3c5b52d0 (huge files)
>
> Hope this helps,
> Vlad
>


-- 
Regards,
Akshay Nehe.