Re: problems with free space cache

[Duncan <1i5t5.duncan@cox.net>]

Qu Wenruo posted on Mon, 16 May 2016 10:24:23 +0800 as excerpted:

> IIRC clear_cache option is fs level option.
> So the first mount with clear_cache, then all subvolume will have
> clear_cache.

Question:  Does clear_cache work with a read-only mount?

I could see it being like the log replay and being done even on ro 
mounts, particularly since unlike the log replay, clear_cache is a 
specific mount option so could be seen as specifically requested even if 
otherwise ro.  Or not.  So I don't know.

He mentioned root, which is normally mounted read-only first.  That's 
what got me thinking about it.  Does that complicate things?

If root is mounted ro without clear_cache by the initr*, will a 
subsequent remount,rw,clear_cache do it?

And for those like me who keep root mounted ro by default, would 
clear_cache work at all, or would it not work until such time as I 
mounted root, or some other subvolume (which I don't have here to worry 
about, but for those who do...) writable?

-- 
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"Every nonfree program has a lord, a master --
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