report a default disk space value in fs.expose.dokan

It's set to something stupidly high since pretending to have too much space
should cause less operations to fail than pretending to have too little.

fs/expose/dokan/__init__.py

@@ -305,7 +305,12 @@ class FSOperations(object):
         finished = threading.Event()
         def reset_timeout_callback():
             while not finished.isSet():
+                finished._Event__cond.acquire()
+                try:
+                    if not finished.isSet():
                         libdokan.DokanResetTimeout(5*60*1000,info)
+                finally:
+                    finished._Event__cond.release()
                 finished.wait(timeout=4*60)
         threading.Thread(target=reset_timeout_callback).start()
         try:
@@ -357,7 +362,12 @@ class FSOperations(object):
             finished = threading.Event()
             def reset_timeout_callback():
                 while not finished.isSet():
+                    finished._Event__cond.acquire()
+                    try:
+                        if not finished.isSet():
                             libdokan.DokanResetTimeout(5*60*1000,info)
+                    finally:
+                        finished._Event__cond.release()
                     finished.wait(timeout=4*60)
             threading.Thread(target=reset_timeout_callback).start()
             lock.acquire()
@@ -381,7 +391,12 @@ class FSOperations(object):
             finished = threading.Event()
             def reset_timeout_callback():
                 while not finished.isSet():
+                    finished._Event__cond.acquire()
+                    try:
+                        if not finished.isSet():
                             libdokan.DokanResetTimeout(5*60*1000,info)
+                    finally:
+                        finished._Event__cond.release()
                     finished.wait(timeout=4*60)
             threading.Thread(target=reset_timeout_callback).start()
             lock.acquire()
@@ -541,7 +556,12 @@ class FSOperations(object):
         finished = threading.Event()
         def reset_timeout_callback():
             while not finished.isSet():
+                finished._Event__cond.acquire()
+                try:
+                    if not finished.isSet():
                         libdokan.DokanResetTimeout(5*60*1000,info)
+                finally:
+                    finished._Event__cond.release()
                 finished.wait(timeout=4*60)
         threading.Thread(target=reset_timeout_callback).start()
         lock.acquire()
@@ -558,7 +578,12 @@ class FSOperations(object):
 
     @handle_fs_errors
     def GetDiskFreeSpaceEx(self, nBytesAvail, nBytesTotal, nBytesFree, info):
-        pass
+        #  This returns a stupidly large number by default.
+        #  It's better to pretend an operation is possible and have it fail
+        #  than to pretend an operation will fail when it's actually possible.
+        nBytesAvail[0] = 100 * 1024*1024*1024
+        nBytesFree[0] = 100 * 1024*1024*1024
+        nBytesTotal[0] = 200 * 1024*1024*1024
 
     @handle_fs_errors
     def GetVolumeInformation(self, vnmBuf, vnmSz, sNum, maxLen, flags, fnmBuf, fnmSz, info):