ceph/ceph — pull request #1216 by ukernel (2014-02-12 02:23:48+00:00)
Title: mds: remove xattr when null value is given to setxattr()

setxattr() should remove xattr if parameter 'value' is NULL. To
distinguish it from the zero-length value case, introduce a new
flag CEPH_XATTR_REMOVE for the setxattr request.

Signed-off-by: Yan, Zheng