Uresh Vahalia's book is also nice. It campares between different Unix
OS. The filesystems chapter gives insight of VFS and some Unix
filesystems.
http://www.amazon.com/gp/product/0131019082/103-1611585-2051061?v=glance&n=283155
regards
Manish Regmi
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Linux Filesystems's by von Hagen.
UNIX Filesystems: Evolution, Design, and Implementation by Pate
kernel.org for the soruce