Removed checkpoints are still subject to protection period

[dexen deVries <dexen.devries-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

Hi,


steps to reproduce:
 * create empty filesystem, mount, ensure nilfs_cleanerd is running on it
 * configure the nilfs_cleanerd for protection period 3600 (seconds)
 * create a bunch of files
 * delete the files
 * the nilfs_cleanerd does not reclaim space, because checkpoints are protected for 3600 seconds (the expected behavior)
 * remove all the snapshots with rmcp
 * the problem: the nilfs_cleanerd still does not reclaim space -- it considers the deleted checkpoints as still protected for the duration of 3600 seconds
 * once 3600 seconds passes, nilfs_cleanerd normally reclaims space

Expected behavior: cleanerd reclaims diskspace of deleted checkpoints regardless of protection period.
Rationale: there's no user-visible way of accessing deleted checkpoints, so there is no point in keeping them 'round.


tested with linux v3.0-rc4, nilfs-utils v2.0.23


Regards,
-- 
dexen deVries

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