sepia-liu has uploaded this change for review.

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MDCACHE: add lru release entries process

If something refs a lot of entries at the same time and above the
high water mark, we have no way to release cache entries below water
level,though it can be released.
By adding this process, every time we can try best to release the number
of entries until entries used below the water level, the max number of
release per time is Entries_Release_Size.

Change-Id: I22e824d0b876ce56848e305db3a948e5c9e8cf84
Signed-off-by: sepia-liu <liuwei_coder@163.com>
---
M src/FSAL/Stackable_FSALs/FSAL_MDCACHE/mdcache_lru.c
M src/FSAL/Stackable_FSALs/FSAL_MDCACHE/mdcache_lru.h
2 files changed, 55 insertions(+), 0 deletions(-)

git pull ssh://review.gerrithub.io:29418/ffilz/nfs-ganesha refs/changes/07/494407/1

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