From f25ca882e4788190b866586686328d0e409d1edf Mon Sep 17 00:00:00 2001
From: Steve Slaven <bpk@hoopajoo.net>
Date: Tue, 28 Jul 2009 16:54:29 -0700
Subject: More fixes to ftruncate to expand a file which was causing the "fake"
 mmap errors in fsx, fixed loading the right block during write()


diff --git a/fusearchive.py b/fusearchive.py
index f3567aa..61dc821 100755
--- a/fusearchive.py
+++ b/fusearchive.py
@@ -666,6 +666,8 @@ class FuseArchive(Fuse):
             index = int( offset / self.chunk_size )
             rest = offset % self.chunk_size
 
+            logging.debug( "This chunk falls on index: " + str( index ) + " rest: " + str( rest ) )
+
             # If index is higher than the number of blocks we current have it's a seek hole, so we need to extend our blocks out
             # We know these need to essentially be zeroed up to this size since
             while index > len( self.chunks ):
@@ -680,6 +682,8 @@ class FuseArchive(Fuse):
                     self.chunk += "\0" * fill_null
                     self.chunk_modified = True
 
+            self._load_chunk( index )
+
             # Now check if this chunk needs to be extended
             if len( self.chunk ) < rest:
                 fill_null = rest - len(self.chunk)
@@ -844,7 +848,7 @@ class FuseArchive(Fuse):
             if need_chunks == 0:
                 logging.debug( "Creating 0 chunk file" )
                 self.chunks = []
-            elif need_chunks > curr_chunks:
+            elif self.size < length:
                 logging.debug( "Need to pad out file, writing/seeking to " + str( length ) )
 
                 # Just write out null bytes to the length requested, write will do this for us if we specify the offset
@@ -860,25 +864,22 @@ class FuseArchive(Fuse):
                     self.chunks.pop()
                     curr_chunks = len( self.chunks )
 
-            # Now make sure this chunk is the right size, first load the
-            # last chunk
-            if len( self.chunks ):
-                self._load_chunk( len( self.chunks ) - 1 )
-                logging.debug( "Loaded final chunk, len: " + str( len( self.chunk ) ) )
-
-            # Now truncate or extend this item
-            if len( self.chunk ) < extra_bytes:
-                remaining = extra_bytes - len(self.chunk)
-                logging.debug( "Extending final chunk " + str( remaining ) + " bytes" )
-                self.chunk += "\0" * remaining
-            else:
-                logging.debug( "Truncating final chunk to " + str( extra_bytes ) )
-                self.chunk = self.chunk[ :extra_bytes ]
+                # Now make sure this chunk is the right size, first load the
+                # last chunk
+                if len( self.chunks ):
+                    self._load_chunk( len( self.chunks ) - 1 )
+                    logging.debug( "Loaded final chunk, len: " + str( len( self.chunk ) ) )
+
+                # Now truncate this item if needed
+                if len( self.chunk ) > extra_bytes:
+                    logging.debug( "Truncating final chunk to " + str( extra_bytes ) )
+                    self.chunk = self.chunk[ :extra_bytes ]
+                    self.chunk_dirty = True
 
             self.modified = True
             self.size = length
             self._load_chunk( 0 )
-            # Don't need to mark dirty cache because we're flushing
+
             self._fflush()
 
         def lock(self, cmd, owner, **kw):
-- 
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