Malcolm V wrote:
I'm writing a program to calculate space lost to the difference between block size and filesize (Surely this has been done before, but I couldn't find it from a quick few googles).
It's actually a difficult task, and impossible to do in a way that is portable between filesystems and even between features of a filesystem. The issues are: - indirect blocks - extent-based allocation - clusters - the special treatment of small files - the existence of file meta-data (such as SELinux labels and ACLs) Then there is the question of how to correctly allocate overheads - the journal on journalling filesystems - directories - any reserved free space not usable by non-root users (eg, is root charged for that reserved 5% of the disk) I occassionally wonder if multiuser filesystems are a good idea at all. -- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html
