Yan, Zheng af5e5eb574 ceph: fix race during filling readdir cache
Readdir cache uses page cache to save dentry pointers. When adding
dentry pointers to middle of a page, we need to make sure the page
already exists. Otherwise the beginning part of the page will be
invalid pointers.

Signed-off-by: Yan, Zheng <zyan@redhat.com>
2016-03-25 18:51:53 +01:00
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