From 44db0f423142b3757cd08f77562ee29c6575aa2a Mon Sep 17 00:00:00 2001
From: Steve Slaven <bpk@hoopajoo.net>
Date: Thu, 6 Aug 2009 16:45:45 -0700
Subject: Pre-init original_chunks because we might need to fflush early in the
 constructor, use ftruncate since truncate doesn't exist, and handle unlocking
 unused chunks due to ftruncate


diff --git a/FuseArchive/ChunkFile.py b/FuseArchive/ChunkFile.py
index 5432f3b..e713e10 100644
--- a/FuseArchive/ChunkFile.py
+++ b/FuseArchive/ChunkFile.py
@@ -87,6 +87,11 @@ class ChunkFile(object):
 
         # The chunk table
         self.chunks = []
+        # Because python is bizarre and you magically define attributes in
+        # the constructor we predefine this here for the case where we
+        # fflush early if we're creating a new file since we reference this
+        # attribute in the routine.  At least it gets initialized I guess
+        self.original_chunks = []
 
         # TODO: Better flag handling here?
         if flags & os.O_RDONLY:
@@ -427,6 +432,14 @@ class ChunkFile(object):
 
                     lock_chunk( key )
 
+            # Free any unused chunks because of ftruncate
+            logging.debug( "Freeing chunks beyond our new chunk count" )
+            index = len( self.chunks )
+            while index < len( self.original_chunks ):
+                logging.debug( "Unlocking chunk at index %d" % index )
+                unlock_chunk( self.original_chunks[ index ] )
+                index += 1
+
             # Update our original_chunks since we've locked/unlocked some
             # things
             self.original_chunks = copy.deepcopy( self.chunks )
diff --git a/FuseArchive/FileSystem.py b/FuseArchive/FileSystem.py
index e70bba6..16e5b2c 100644
--- a/FuseArchive/FileSystem.py
+++ b/FuseArchive/FileSystem.py
@@ -49,7 +49,7 @@ class FileSystem(fuse.Fuse):
     def unlink(self, path):
         # Do a truncate to free our chunks
         f = ChunkFile( path, os.O_RDWR, 0 )
-        f.truncate( 0 )
+        f.ftruncate( 0 )
         f.release( 0 )
         os.unlink("./tree" + path)
 
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