cache manager does not free the cache about ngx_slowfs_cache HOT 7 CLOSED

after i have restarted nginx with full cache, nginx cleaned up cache to correct size (1800m) and hold it correct.

so, i think problem exists only when nginx starts with absolutly empty cache (both times i have cleaned directory /var/cache/nginx by using rm -rf /var/cache/nginx/* before start).

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after about 24 hours of normal work, it stopped to clean up cache again... that looks like a bug..

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I've already written this in letter, but I'll repeat it here:
This happens because cache manager repeatedly tries and fails to purge cache entry with nonzero usage count.
By nonzero I mean 0xFFFFF, that is, 20-bit "-1". That is not because of the only decrement in slowfs code, so it's increment missing somewhere.
This only happens with nginx 1.2.*, so workaround is to use nginx 1.0.

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thank you very much

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Also, proposed solution for bug #4 solves this problem.
I'm now running 1.2.6 for two days and 5M cache requests without violating max_size limit.

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Fixed in 5800076 (1.10). Thanks for report and sorry for the delay.

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thank you very much for your great work!

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