From: majianpeng <majianpeng@gmail.com>
Date: Wed, 21 Aug 2013 07:02:51 +0000 (+0800)
Subject: ceph: allow sync_read/write return partial successed size of read/write.
X-Git-Tag: v3.12-rc1~90^2~14
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ee7289bfadda5f4ef60884547ebc9989c8fb314a;p=pandora-kernel.git

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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