bug#15056: Please indicate the meaning of block sizes in filesystem information

[Filipus Klutiero]

Severity: wishlist

stat -f provides information on the filesystem, including block sizes:
> Block size: 4096       Fundamental block size: 4096
The unit used in unfortunately not specified. Considering the fdisk output I 
get...
> Sector size (logical/physical): 512 bytes / 512 bytes
> I/O size (minimum/optimal): 512 bytes / 512 bytes
... I guess bits are the unit.

Note that the first measure ("Block size") is quite ambiguous. 
http://www.hitachi.co.jp/Prod/comp/soft1/manual/jp1en/d3R4900e/PCAU0135.HTM has some 
block size terminology which might help (if that's indeed the type of block we mean):
> The basic block size (FFBS: Fundamental Filesystem Block Size) used in the 
> field table of this record is the allocation unit used during file system 
> creation. The number of blocks that corresponds to the basic block size is 
> called the /basic block count/. The logical block size (PFBS: Preferred 
> Filesystem Block Size) is the allocation unit used during input/output 
> operations. The number of blocks that corresponds to the logical block size is 
> called the /logical block count/.
--
Filipus Klutiero
http://www.philippecloutier.com