[Bug 201750] Re: Cannot remount loopfiles

[Noorez]

Looks like a related (possibly smae) has emerged in ubuntu 14.10

https://bugs.launchpad.net/ubuntu/+source/lupin/+bug/1317437

It seems that not only does the host file system have to be rw but also
the loop file. The ticket above shows that by changing the kernel
parameter from ro->rw corrects the issue in that ticket.

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https://bugs.launchpad.net/bugs/201750

Title:
  Cannot remount loopfiles

Status in Wubi, Windows Ubuntu Installer:
  In Progress
Status in “initramfs-tools” package in Ubuntu:
  In Progress

Bug description:
  Binary package hint: initramfs-tools

  Loopfiles inside of vfat cannot be remounted rw. This preventfs people
  from booting off loopinstallations in vfat. At the moment there is an
  exception in scripts/local to mount ntfs filesystems rw by default
  since those too cannot be remounted (bug #186117). It might be
  necessary to extend the treatment to all loopinstalation filesystems.
  Following are some of my experiments, not sure if there is some other
  way to be able to remount the host/loopfile.

  root at nbago~#mount -t vfat -o rw /dev/sda8 /mnt
  root at nbago~#mount -o loop,ro /mnt/root.disk /media/tmp 
  root at nbago~#mount -o remount,rw /media/tmp
  mount: block device /mnt/root.disk is write-protected, mounting read-only
  root at nbago~#umount /media/tmp
  root at nbago~#mount -o loop,rw /mnt/root.disk /media/tmp
  root at nbago~#mount -o remount,ro /media/tmp           
  root at nbago~#mount -o remount,rw /media/tmp
  root at nbago~#mount -o remount,ro /mnt      
  mount: /mnt is busy
  root at nbago~#mount -o remount,ro /media/tmp
  root at nbago~#mount -o remount,ro /mnt      
  mount: /mnt is busy
  root at nbago~#umount /media/tmp
  root at nbago~#umount -d /mnt
  root at nbago~#mount -t vfat -o ro /dev/sda8 /mnt
  root at nbago~#mount -o loop,rw /mnt/root.disk /media/tmp
  root at nbago~#mount -o remount,rw /media/tmp
  mount: block device /mnt/root.disk is write-protected, mounting read-only
  root at nbago~#umount /media/tmp 
  root at nbago~#losetup /dev/loop3 /mnt/root.disk 
  root at nbago~#mount -o ro -t ext3 /dev/loop3 /media/tmp
  root at nbago~#mount -o remount,rw /media/tmp           
  mount: block device /dev/loop3 is write-protected, mounting read-only

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