Proposing space management API to perform hole-punching

[Poul-Henning Kamp]

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Ka Ho Ng via freebsd-arch writes:

> The proposal contains fspacectl(2), VOP_DEALLOCATE(9) and vn_deallocate(9). fspacectl(2) is a space management API that takes a file descriptor, a command value, a range and flags.  The system call is responsible for doing space management operations such as punching holes, which is the only operation supported so far. [...]

1. Which other operations are/can be foreseen ?

2. What arguments would they need ?

3. Should the syscall definition take this into account already now ?

4. Are there any existing APIs for this ?

5. Should we stick closely to them ?  If not, why not ?

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