Пример #1
0
 def open(self, path, isdir=False):
     inode_no = self.search_dir(path)
     if inode_no is None:
         raise Exception("path does not exist")
     if isdir:
         return Directory(inode_no)
     else:
         return File(inode_no)
Пример #2
0
 def unlink(self, path):
     filename = find_filename(path)
     parent_inode_no = self.search_dir(find_parent(path))
     parent_inode_block = inodemap.inodemap.lookup(parent_inode_no)
     parent_inode = Inode(data=segment.segman.block_read(parent_inode_block))
     parent_old_size = parent_inode.filesize
     parent_dir = Directory(parent_inode_no)
     found_entry = False
     entries = []
     for (name, inode) in parent_dir.enumerate():
         if found_entry:
             entries.append((name, inode))
         if name == filename:
             fount = True
             position = parent_dir.position - (FILENAMELEN + 4)
     for (name, inode) in entries:
         parent_inode.write(position, struct.pack("%dsI" % FILENAMELEN, name, inode))
         position += FILENAMELEN + 4
     parent_inode.filesize = parent_old_size - (FILENAMELEN + 4)
     inodemap.inodemap.update_inode(parent_inode_no, parent_inode.serialize())
Пример #3
0
 def search_dir(self, path):
     # print map(ord, path)
     path = path.strip()
     if path == "/":
         return 1
     current_dir = Directory(1)
     stack = path.split("/")[1:]
     stack.reverse()
     while True:
         name = stack.pop()
         found = False
         for (n, inode) in current_dir.enumerate():
             if n == name:
                 found = True
                 break
         if found:
             if len(stack) == 0:
                 return inode
             else:
                 current_dir = Directory(inode)
         else:
             return None
Пример #4
0
 def search_dir(self, path):
     #print map(ord, path)
     path = path.strip()
     if path == "/":
         return 1
     current_dir = Directory(1)
     stack = path.split("/")[1:]
     stack.reverse()
     while True:
         name = stack.pop()
         found = False
         for (n, inode) in current_dir.enumerate():
             if n == name:
                 found = True
                 break
         if found:
             if len(stack) == 0:
                 return inode
             else:
                 current_dir = Directory(inode)
         else:
             return None
Пример #5
0
 def unlink(self, path):
     filename = find_filename(path)
     parent_inode_no = self.search_dir(find_parent(path))
     parent_inode_block = inodemap.inodemap.lookup(parent_inode_no)
     parent_inode = Inode(
         data=segment.segman.block_read(parent_inode_block))
     parent_old_size = parent_inode.filesize
     parent_dir = Directory(parent_inode_no)
     found_entry = False
     entries = []
     for (name, inode) in parent_dir.enumerate():
         if found_entry:
             entries.append((name, inode))
         if name == filename:
             fount = True
             position = parent_dir.position - (FILENAMELEN + 4)
     for (name, inode) in entries:
         parent_inode.write(position,
                            struct.pack("%dsI" % FILENAMELEN, name, inode))
         position += (FILENAMELEN + 4)
     parent_inode.filesize = parent_old_size - (FILENAMELEN + 4)
     inodemap.inodemap.update_inode(parent_inode_no,
                                    parent_inode.serialize())
Пример #6
0
    def create(self, filename, isdir=False):
        inode_no = self.search_dir(filename)
        if inode_no is not None:
            raise Exception("file already exists")

        inode = Inode(isdir=isdir)

        parent_dir = find_parent(filename)
        parent_inode_no = self.search_dir(parent_dir)
        if parent_inode_no is None:
            raise Exception("parent direntory does not exist")
        parent_inode_block = inodemap.inodemap.lookup(parent_inode_no)
        parent_inode = Inode(
            data=segment.segman.block_read(parent_inode_block))
        self.append_entry(parent_inode, find_filename(filename), inode)

        if isdir:
            return Directory(inode.id)
        else:
            return File(inode.id)