From: Yan, Zheng <zyan@redhat.com>
Date: Tue, 16 Sep 2014 13:46:17 +0000 (+0800)
Subject: ceph: request xattrs if xattr_version is zero
X-Git-Tag: omap-for-v3.19/prcm-cleanup~68^2~17
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=508b32d8661b12da4c9ca41a9b2054e1dc92fa7e;p=pandora-kernel.git

ceph: request xattrs if xattr_version is zero

Following sequence of events can happen.
  - Client releases an inode, queues cap release message.
  - A 'lookup' reply brings the same inode back, but the reply
    doesn't contain xattrs because MDS didn't receive the cap release
    message and thought client already has up-to-data xattrs.

The fix is force sending a getattr request to MDS if xattrs_version
is 0. The getattr mask is set to CEPH_STAT_CAP_XATTR, so MDS knows client
does not have xattr.

Signed-off-by: Yan, Zheng <zyan@redhat.com>
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