> You could of course design a filesystem which maintained a reverse map
> data structure, but it would slow the filesystem down since it would
> be a separate data structure that would have to be updated each time
> you allocated or freed a disk block. And the only use for such a data
> structure would be to make shrinking a filesystem more efficient.
> Given that this is generally not a common operation, it seems unlikely
> that a filesystem designer would choose to make this particular
> tradeoff.
Or you could set if switched off by default. E.g. reserve the space for
it and activate it as soon as some magic switch is set in the kernel.
Then some background processs should update it while als keeping track
of current changes. Then when everything is finished, update some flag
to let the resizer know it can do its job.
Folkert van Heusden
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