I am wondering what allocation method does UFS use? I know there are several options: contiguous, linked allocation and indexed allocation. Which one is for UFS?
The details are in the paper A Fast File System for UNIX:
Your example terms don't coincide with anything I'm familiar with in file systems. The two proper forms of allocations I know of relate to disk space and inodes.
Where disk space is concerned, the two key forms for traditional file systems are extent-based and block-based. UFS is block-based.
Inodes are allocated statically (i.e., at file system creation time) or dynamically. UFS allocates inodes statically.
Does your question refer to some other facet of UFS, perhaps?