Stephen C. Tweedie wrote:
>
>[ extent mapping ]
>
>The main problem with this technique is that it completely falls apart
>when you consider Unix semantics for files with holes --- you end up
>having to reshuffle the entire extent map any time you insert new data
>by writing into a hole. The current plan is simply to convert
>on-the-fly from extent mapped to direct indexed block mapping if such
>a write occurs.
>
Moving the extent mp around shouldn't be _too_ difficult...
There's also the possibility that you need to move a block from the middle
of an extent someplace else (file system inconsistency, bad block
discovered on media).
-- Nobody ever forgets where he buried the hatchet. -- Kin Hubbard-- Matthias Urlichs \ noris network GmbH / Xlink-POP Nürnberg Schleiermacherstraße 12 \ Linux+Internet / EMail: urlichs@noris.de 90491 Nürnberg (Germany) \ Consulting+Programming+Networking+etc'ing PGP: 1024/4F578875 1B 89 E2 1C 43 EA 80 44 15 D2 29 CF C6 C7 E0 DE Click <A HREF="http://info.noris.de/~smurf/finger">here</A>. 42