DHT/Create : Failing to identify a linkto file in lookup_everywhere_cbk path

In case a file is not found in its cached subvol we proceed with
dht_lookup_everywhere. But as we dont add the linkto xattr to the
dictionary, we fail to identify any linkto file encountered.The
implication being we end up thinking the linkto file as a regular file
and proceed with the fop.

Change-Id: Iab02dc60e84bb1aeab49182f680c0631c33947e2
BUG: 1139170
Signed-off-by: Susant Palai <spalai@redhat.com>
Reviewed-on: http://review.gluster.org/8277
Reviewed-by: Vijay Bellur <vbellur@redhat.com>
Tested-by: Gluster Build System <jenkins@build.gluster.com>
(cherry picked from commit 52da727e7564963a8a244fc5cb7028315e458529)
Signed-off-by: Nithya Balachandran <nbalacha@redhat.com>
Reviewed-on: http://review.gluster.org/8715
Reviewed-by: Jeff Darcy <jdarcy@redhat.com>
storage/posix: removing deleting entries in case of creation failures

The code is not atomic enough to not to delete a dentry created by a
prallel dentry creation operation.

Change-Id: I9bd6d2aa9e7a1c0688c0a937b02a4b4f56d7aa3d
BUG: 1129527
Signed-off-by: Raghavendra G <rgowdapp@redhat.com>
Reviewed-on: http://review.gluster.org/8327
Reviewed-by: Pranith Kumar Karampuri <pkarampu@redhat.com>
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>
(cherry picked from commit 45fbf99cb669e891a84a8228cef27973f5e774bf)
Signed-off-by: Nithya Balachandran <nbalacha@redhat.com>
Reviewed-on: http://review.gluster.org/8716
Reviewed-by: Niels de Vos <ndevos@redhat.com>