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ceph-fuse: add option to disable kernel pagecache
When multiple clients read/write to a file at the same time, we need to disable cache and let reads/writes go to OSDs. In ceph-fuse case, there are two caches, one is in ceph-fuse, another one is in kernel. We can't disable/enable the kernel cache dynamically. So adding an config option to completely disable kernel cache. Disabling kernel cache may reduce performance, so option is disabled by default. Fixes: 12653 Signed-off-by: Yan, Zheng <zyan@redhat.com>
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