Hi,
I know I can create a file and mount it like this:
dd if=/dev/zero of=/tmp/somefile bs=1024 count=100000 mke2fs /tmp/somefile mount /tmp/somefile /mnt -o loop
but that has a problem it cannot grow.
Is there a way to do the same (above) but have it not restricted to a size?
Or can I append blocks to the end of the file without distroying it?
Jobst
The question is what do you want from this feature. The LVM would be able to provide you the ability to adjust the size dynamically. loop device is not part of this game. It offers you build the kernel or fixed file only. To append the number of null will make the system to be reformatted again to me.
I don't think we can do it.
------------ Banyan He Blog: http://www.rootong.com Email: banyan@rootong.com
On 2012-10-23 2:08 PM, Jobst Schmalenbach wrote:
Hi,
I know I can create a file and mount it like this:
dd if=/dev/zero of=/tmp/somefile bs=1024 count=100000 mke2fs /tmp/somefile mount /tmp/somefile /mnt -o loop
but that has a problem it cannot grow.
Is there a way to do the same (above) but have it not restricted to a size?
Or can I append blocks to the end of the file without distroying it?
Jobst
btw, here is the way to append more bytes on the tail,
dd if=/dev/zero of=myfile bs=1 count=no_of_bytes seek=$(stat -c%s myfile)
------------ Banyan He Blog: http://www.rootong.com Email: banyan@rootong.com
On 2012-10-23 2:08 PM, Jobst Schmalenbach wrote:
Hi,
I know I can create a file and mount it like this:
dd if=/dev/zero of=/tmp/somefile bs=1024 count=100000 mke2fs /tmp/somefile mount /tmp/somefile /mnt -o loop
but that has a problem it cannot grow.
Is there a way to do the same (above) but have it not restricted to a size?
Or can I append blocks to the end of the file without distroying it?
Jobst
On 10/23/2012 03:44 AM, Banyan He wrote:
btw, here is the way to append more bytes on the tail,
dd if=/dev/zero of=myfile bs=1 count=no_of_bytes seek=$(stat -c%s myfile)
Sounds like a hard way to do dd conv=notrunc oflag=append if=/dev/zero ...
On Tue, Oct 23, 2012 at 08:08:38AM -0500, Robert Nichols (rnicholsNOSPAM@comcast.net) wrote:
On 10/23/2012 03:44 AM, Banyan He wrote:
btw, here is the way to append more bytes on the tail,
dd if=/dev/zero of=myfile bs=1 count=no_of_bytes seek=$(stat -c%s myfile)
Sounds like a hard way to do dd conv=notrunc oflag=append if=/dev/zero ...
was thinking more of a LVM way to do this.
Jobst
exactly, that's a wise choice.
Best regards,
------------ Banyan He Blog: http://www.rootong.com Email: banyan@rootong.com
On 2012-10-24 1:45 PM, Jobst Schmalenbach wrote:
On Tue, Oct 23, 2012 at 08:08:38AM -0500, Robert Nichols (rnicholsNOSPAM@comcast.net) wrote:
On 10/23/2012 03:44 AM, Banyan He wrote:
btw, here is the way to append more bytes on the tail,
dd if=/dev/zero of=myfile bs=1 count=no_of_bytes seek=$(stat -c%s myfile)
Sounds like a hard way to do dd conv=notrunc oflag=append if=/dev/zero ...
was thinking more of a LVM way to do this.
Jobst
On 23.10.2012 14:08, Robert Nichols wrote:
On 10/23/2012 03:44 AM, Banyan He wrote:
btw, here is the way to append more bytes on the tail,
dd if=/dev/zero of=myfile bs=1 count=no_of_bytes seek=$(stat -c%s myfile)
Sounds like a hard way to do dd conv=notrunc oflag=append if=/dev/zero ...
Still looks hard. Try:
man truncate man qemu-img
-
Banyan He -
Jobst Schmalenbach -
Nux! -
Robert Nichols