gsyncd / geo-rep: ignore DHTs sticky bit file during crawl

Change-Id: Ide927759c6a3d5301475eac9f6e785aa901d426e
BUG: 1036539
Signed-off-by: Venky Shankar <vshankar@redhat.com>
Reviewed-on: http://review.gluster.org/6792
Reviewed-by: Kotresh HR <khiremat@redhat.com>
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>

geo-replication/syncdaemon/master.py

@@ -1184,6 +1184,13 @@ class GMasterXsyncMixin(GMasterChangelogMixin):
             if stime and stime[-1]:
                 self.sync_stime(stime[-1], last)
 
+    def is_sticky(self, path, mo):
+        """check for DHTs linkto sticky bit file"""
+        sticky = False
+        if mo & 01000:
+            sticky = self.master.server.linkto_check(path)
+        return sticky
+
     def Xcrawl(self, path='.', xtr_root=None):
         """
         generate a CHANGELOG file consumable by process_change.
@@ -1235,6 +1242,9 @@ class GMasterXsyncMixin(GMasterChangelogMixin):
             if isinstance(st, int):
                 logging.warn('%s got purged in the interim ...' % e)
                 continue
+            if self.is_sticky(e, st.st_mode):
+                logging.debug('ignoring sticky bit file %s' % e)
+                continue
             gfid = self.master.server.gfid(e)
             if isinstance(gfid, int):
                 logging.warn('skipping entry %s..' % e)

geo-replication/syncdaemon/resource.py

@@ -321,6 +321,18 @@ class Server(object):
             else:
                 raise
 
+    @classmethod
+    @_pathguard
+    def linkto_check(cls, path):
+        try:
+            return not (Xattr.lgetxattr_buf(path, 'trusted.glusterfs.dht.linkto') == '')
+        except (IOError, OSError):
+            ex = sys.exc_info()[1]
+            if ex.errno in (ENOENT, ENODATA):
+                return False
+            else:
+                raise
+
 
     @classmethod
     @_pathguard
@@ -1139,6 +1151,9 @@ class GLUSTER(AbstractUrl, SlaveLocal, SlaveRemote):
                     def gfid(cls, e):
                         """ path based backend gfid fetch """
                         return super(brickserver, cls).gfid(e)
+                    @classmethod
+                    def linkto_check(cls, e):
+                        return super(brickserver, cls).linkto_check(e)
                 if gconf.slave_id:
                     # define {,set_}xtime in slave, thus preempting
                     # the call to remote, so that it takes data from