Django-媒体上传[Errno 13]权限被拒绝

在让django很好地处理图片上传方面，我遇到了一些麻烦。我的脚本将基于以下日期创建目录：

I'm having some trouble getting django to play nice with image uploads. My script will create directories based on the date like so:

file = models.FileField(upload_to='uploads/%m-%Y/')

现在，如果我在uploads文件夹中创建带日期的目录并对该文件夹进行chmod到755，上传正常，但是如果我尝试对upmods文件夹进行chmod而不创建带日期的子文件夹（我需要django来做），则会出现权限错误。

Now, if I create the dated directory in the uploads folder and chmod the folder to 755, the upload works fine, but if I try to chmod the uploads folder without creating the dated sub folder (which I need django to do), I am getting a permissions error.

如何使文件夹允许创建子文件夹？

How do I make it so a folder will allow the creation of sub folders?

这是一个追溯：

Django Version: 1.3
Python Version: 2.5.2
Installed Applications:
['django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.messages',
 'django.contrib.admin',
 'tagging',
 'mediamanager',
 'livesettings',
 'projects']
Installed Middleware:
('django.middleware.common.CommonMiddleware',
 'django.contrib.sessions.middleware.SessionMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware')


Traceback:
File "/var/lib/python-support/python2.5/django/core/handlers/base.py" in get_response
  111.                         response = callback(request, *callback_args, **callback_kwargs)
File "/var/lib/python-support/python2.5/django/utils/decorators.py" in _wrapped_view
  93.                     response = view_func(request, *args, **kwargs)
File "/var/lib/python-support/python2.5/django/contrib/auth/decorators.py" in _wrapped_view
  23.                 return view_func(request, *args, **kwargs)
File "/var/www/enigma-dev/enigma/mediamanager/views.py" in upload_media
  24.           m.upload_media(data=form.cleaned_data, params=params)
File "/var/www/enigma-dev/enigma/mediamanager/models.py" in upload_media
  63.       self.save()
File "/var/lib/python-support/python2.5/django/db/models/base.py" in save
  460.         self.save_base(using=using, force_insert=force_insert, force_update=force_update)
File "/var/lib/python-support/python2.5/django/db/models/base.py" in save_base
  543.                         for f in meta.local_fields if not isinstance(f, AutoField)]
File "/var/lib/python-support/python2.5/django/db/models/fields/files.py" in pre_save
  255.             file.save(file.name, file, save=False)
File "/var/lib/python-support/python2.5/django/db/models/fields/files.py" in save
  92.         self.name = self.storage.save(name, content)
File "/var/lib/python-support/python2.5/django/core/files/storage.py" in save
  49.         name = self._save(name, content)
File "/var/lib/python-support/python2.5/django/core/files/storage.py" in _save
  166.             os.makedirs(directory)
File "/usr/lib/python2.5/os.py" in makedirs
  171.     mkdir(name, mode)

Exception Type: OSError at /media-manager/upload/
Exception Value: [Errno 13] Permission denied: '/var/www/site-dev/site/static/uploads/04-2011'