[lug] q: ramdisk /tmp & mount plain files

Chan Kar Heng chankarheng at gmail.com
Mon May 3 10:49:12 MDT 2010

Thanks Zan! That extra bit of info helps. :)

Zan Lynx wrote:
> On 5/2/10 11:22 AM, David Stearns wrote:
>>> 2) how could i mount a plain binary file as a read/write filesystem?
>>> that's assuming that one can do an mkfs on a plain file too.
>>> context is that, i might backup an entire filesystem to a plain file
>>> (eg: cat /dev/sda0>  /home/myhome/myfsbackup;
>>> so now I wanna do a mount /home/myhome/myfsbackup /mymountpoint and be
>>> able to access things backed up.)
>> You should be able to
>> `mount -oloop -t<fstype>  /home/myhome/myfsbackup /mymountpoint`
>> That should do what you need.
> I think that you need to use dd if=/dev/zero of=file bs=1024k count=[# 
> of megs] to make the file before you can run mkfs on it. mkfs generally 
> expects a file or device or partition to already have a size.
> You may also be able to use dd with the skip option to make a sparse 
> file and use that with mkfs.

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