Thanks for the info,
> This can be achieved using tools already in Debian.
> Install blktrace [1], and try:
>
> blktrace -d /dev/sda -o - | blkparse -i -
>
> [1] http://packages.debian.org/blktrace

        I think blktrace would work for my situation, checking for any program 
that 
writes to the harddisk.
        But some advantages of loggedfs are:
        It takes as an input a directory, not a device. This makes it more 
flexible 
(for purposes other than my own).
        It is a fuse filesystem, so it might not require root permissions 
unlike 
blktrace. (I haven't actually tried loading it as non-root.)
        It doesn't require debugfs compiled into kernel.  It doesn't require 
CONFIG_BLK_DEV_IO_TRACE turned on.
        It looks like blktrace might report more events.  I'm not sure though.

C.



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