[Bug 1010176] Re: casper toram doesn't free /dev/loop0 after copy

[Bob/Paul]

I believe this is a regression, as I reported it working correctly on
11.04 in an edit I made to the wiki (https://wiki.ubuntu.com/BootToRAM)
I'm downloading 11.04 and 11.10 to confirm.

>I agree it's perfectly reasonable to keep /isodevice mounted after boot
toram in case the user wants something on there,

No, that's not really good. It's better to clean things up fully. If the
user unplugs and replugs, it'll show up in /media/FS_LABEL
(/media/CORSAIR in my case). This is where the user should expect to
find thumbdrives, not in /isodevice. After booting with toram, the
device should be unmounted so it can be safetly pulled. If the user
wants something on it, they should plug it back in.

>Since yanking the device anyway doesn't cause any problems,

Presumably the filesystem on your thumbdrive is FAT32. Other filesystems
might not be so friendly without a clean unmount, but even FAT32 will be
marked as dirty and request an fsck when next mounted. This can
sometimes interfere with automount systems on various OSs/distros (had
issues with this in the past on both WinXP and freebsd for sure, though
not necessarily related to this bug).

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https://bugs.launchpad.net/bugs/1010176

Title:
  casper toram doesn't free /dev/loop0 after copy

Status in “casper” package in Ubuntu:
  Confirmed

Bug description:
  When booting Ubuntu 12.04 livecd using the "toram" option to copy the
  CD image into RAM before proceeding, casper mounts the imstallation
  media at /isodevice at boot. This device is no longer necessary once
  the image copy is complete, and therefore unmounting it should work if
  requested by the user.

  However, attempting to umount it fails claiming it is busy, yet fuser
  -m provides nothing. It turns out that /dev/loop0 is still bound to
  the image stored on /isodevice.

  I agree it's perfectly reasonable to keep /isodevice mounted after
  boot toram in case the user wants something on there, but it should be
  easy via gui or cli to umount it, and since the loopback doesn't show
  in lsof or fuser -m, many intermediate users are going to be stumped
  by this.

  Since yanking the device anyway doesn't cause any problems, I would
  consider this a minor bug concerned primarily with user friendliness.

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