Re: Things that Longhorn seems to be doing right

[Ihar 'Philips' Filipau]

Hans Reiser wrote:
> All that said, the indexes themselves should just be feature enhanced 
> directories accessed via the kernel.  Feature enhancements might include 
> such things as better space efficiency, ordering plugins, etc.

  I still see no point in putting this into kernel space.

  As a proof of concept - if someone wants to try - one can implement 
this system on top of any other fs. in user space.

  open("/aaa.txt") ->
    inode ->
     underlaying_fs.open(itoa(inode)+".meta")
     underlaying_fs.open(itoa(inode)+".data")

  write(fd) -> fd<->inode -> updateindex(inode) + write(inode). [1]

  and so on and so forth. LD_PRELOAD=libcoolfs.so my_cool_app

  in other words file system can be used as smart storage.
  hard links can be 'mis'used to implement search indeces.

[1]  mmap() is the notable problem.

--
Ihar 'Philips' Filipau  / with best regards from Saarbruecken.
--
  "... and for $64000 question, could you get yourself vaguely
     familiar with the notion of on-topic posting?"
				-- Al Viro @ LKML

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