Does it possible to mount one disk image to some target points?

Dimit · 01-12-2010, 09:14 AM

Hello All!

I try to mount one disk image to two points.

sudo mount -o loop,user,uid=dm /home/dm/mmm/test_drive1.img /home/dm/mmm/fs
sudo mount -o loop,user,uid=dm /home/dm/mmm/test_drive1.img /home/dm/mmm/fs2

Thats done

But when i create,copy or change anything on one mount point (../fs) its not updates on second mount point (../fs2).

Does anyone know way to 'share' one disk image (.img) to some mount points?

Thanks for all!!!
Dmit

amani · 01-12-2010, 09:41 AM

You are not editing the image

cola · 01-12-2010, 09:54 AM

Quote:

Originally Posted by Dimit

Hello All!

I try to mount one disk image to two points.

sudo mount -o loop,user,uid=dm /home/dm/mmm/test_drive1.img /home/dm/mmm/fs
sudo mount -o loop,user,uid=dm /home/dm/mmm/test_drive1.img /home/dm/mmm/fs2

Thats done

But when i create,copy or change anything on one mount point (../fs) its not updates on second mount point (../fs2).

Does anyone know way to 'share' one disk image (.img) to some mount points?

Thanks for all!!!
Dmit

Those are two different mount points.

rn_ · 01-12-2010, 10:39 AM

i'm just theorizing based on my own experiments. It appears that there's a filesystem/journal cache that is being maintained somewhere. the underlying image is not updated until you umount the fs. 'sync' does not appear to affect it. The issue is that this also can cause data corruption (as I was successful in doing

.

simple solution: do not mount the image twice. use the mount --bind option, like so:

mount --bind /home/dm/mmm/fs /home/dm/mmm/fs2

HTH.
-RN.