Mounting a filesystem image with `mount -t ext2 -o loop=/dev/loop1 foo
bar` works fine -- the first time. Unmounting it also works. However
once I have executed the above mount/unmount commands, any successive
mount using /dev/loop1 fails with: "ioctl: LOOP_SET_FD: Device or resource
busy."
Also, after any mounts using loop-back devices have been unmounted, trying
to rmmod the loop device fails with a similar message.
I wasn't sure if this behavior was due to the kernel or umount (mount
2.9o) not freeing resources correctly. Either way, at this point I have
to reboot to use /dev/loop1 a second time.
1. read "man 8 mount"
2. read "man losetup"
More explicitly:
>From man mount:
... It is possible to replace /etc/mtab by a
symbolic link to /proc/mounts, but some information is
lost that way, and in particular working with the loop
device will be less convenient.
So, either do not use the symlink, or do the `losetup -d' by hand.
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