From: majianpeng <majianpeng@gmail.com>
Date: Thu, 12 Sep 2013 05:54:26 +0000 (+0800)
Subject: ceph: Implement writev/pwritev for sync operation.
X-Git-Tag: v3.14-rc1~71^2~74
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e8344e668915a7488def414f016dbf7d9fce84b5;p=pandora-kernel.git

ceph: Implement writev/pwritev for sync operation.

For writev/pwritev sync-operatoin, ceph only do the first iov.

I divided the write-sync-operation into two functions. One for
direct-write, other for none-direct-sync-write. This is because for
none-direct-sync-write we can merge iovs to one. But for direct-write,
we can't merge iovs.

Signed-off-by: Jianpeng Ma <majianpeng@gmail.com>
Reviewed-by: Yan, Zheng <zheng.z.yan@intel.com>
Signed-off-by: Sage Weil <sage@inktank.com>
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