DHT/Mkdir: Fail mkdir with ENOENT, if parent is not available

Change-Id: I54227bcafb6d0d8cf716a679d2a34be7fc916898
BUG: 1078847
Signed-off-by: Susant Palai <spalai@redhat.com>
Reviewed-on: http://review.gluster.org/7306
Reviewed-by: Raghavendra G <rgowdapp@redhat.com>
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>
DHT: Wrong error handling in gf_defrag_migrate_data

Problem:
         Because of the condition (err = op_errno), err was set to
zero always and ENOSPC error will be logged always. "dht_check_free_
space" was returning 1 and it was mapped to EPERM in "rebalance_task
_completion".

Solution: Changed the return value in dht_check_free_space to -1
as in rebalance_task_completion op_ret value -1 is mapped to ENOSPC.

And fixed the wrong error condition after syncop_setxattr in
gf_defrag_migrate_data.

Change-Id: I474ea1bef3b1e34c89814ed0091dd02bd5b63737
BUG: 1054703
Signed-off-by: Susant Palai <spalai@redhat.com>
Reviewed-on: http://review.gluster.org/6727
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Raghavendra G <rgowdapp@redhat.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>
Posix/readdirp : Avoid filling wrong stat info for dentry in readdirp

Problem:  Upon no entry found for a dentry, posix_readdirp_fill
          used to fill the stat for the current entry with the
          previous one.

Solution: Continue with other entries if lstat failed for current
          one

Change-Id: Ic96b5900451ed6c8de59acf9fee2e116649d3cdb
BUG: 1096578
Signed-off-by: Susant Palai <spalai@redhat.com>
Reviewed-on: http://review.gluster.org/7733
Reviewed-by: Raghavendra G <rgowdapp@redhat.com>
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>