[Bug 201750] [NEW] Cannot remount loopfiles inside of vfat

[Agostino Russo]

Public bug reported:

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

** Affects: initramfs-tools (Ubuntu)
     Importance: Undecided
         Status: New

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Cannot remount loopfiles inside of vfat
https://bugs.launchpad.net/bugs/201750
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