doc: add description for fuse_disable_pagecache

Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
Fixes: https://tracker.ceph.com/issues/16300

diff --git a/doc/cephfs/client-config-ref.rst b/doc/cephfs/client-config-ref.rst
index 931756446e50ec346ddc9179f1427f1fa5ace740..55820a4591e49c6bf589de7b8729c5defdf00311 100644 (file)
--- a/doc/cephfs/client-config-ref.rst
+++ b/doc/cephfs/client-config-ref.rst
@@ -183,6 +183,12 @@
 :Type: Integer
 :Default: ``0``
 
+``fuse disable pagecache``
+
+:Description: If set to ``true``, kernel page cache is disabled for ceph-fuse mount. Because when multiple clients read/write to a file at the same time, reader may get stale data from page cache. (Due to limitation of fuse, ceph-fuse can't disable page cache dynamically)
+:Type: Boolean
+:Default: ``false``
+
 Developer Options
 #################