[Bugs] [Bug 1533804] readdir-ahead: change of cache-size should be atomic

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1533804



--- Comment #2 from Worker Ant <bugzilla-bot at gluster.org> ---
COMMIT: https://review.gluster.org/19187 committed in master by \"Zhang Huan\"
<zhanghuan at open-fs.com> with a commit message- performance/readdir-ahead: fix
cache usage update issue

Use atomic operation to modify cache-size to protect it from concurrent
modification.

Change-Id: Ie73cdd4abbaf0232b1db4ac856c01d24603890ad
BUG: 1533804
Signed-off-by: Zhang Huan <zhanghuan at open-fs.com>

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