From ee7289bfadda5f4ef60884547ebc9989c8fb314a Mon Sep 17 00:00:00 2001
From: majianpeng <majianpeng@gmail.com>
Date: Wed, 21 Aug 2013 15:02:51 +0800
Subject: [PATCH] ceph: allow sync_read/write return partial successed size of
 read/write.

For sync_read/write, it may do multi stripe operations.If one of those
met erro, we return the former successed size rather than a error value.
There is a exception for write-operation met -EOLDSNAPC.If this occur,we
retry the whole write again.

Signed-off-by: Jianpeng Ma <majianpeng@gmail.com>
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