OSerror when uploading files over a NFS

Question

When I try to upload a media file through the django admin interface, I get this error :

OSError: [Errno 45] Operation not supported

Here is the last line of the traceback :

  File "/path/to/home/Envs/myenv/lib/python3.5/site-packages/django/core/files/locks.py", line 112, in unlock
    ret = fcntl.lockf(_fd(f), fcntl.LOCK_UN)

I found this answer and one of the comments led me to this ticket and then to this commit, introduced in the ticket as a "workaround" (see below).

Here are the change I should do in django/core/files/locks.py according to the workaround.

  elif system_type == 'posix':
     def lock(file, flags):
-        fcntl.flock(fd(file), flags)
+        fcntl.lockf(fd(file), flags)

     def unlock(file):
-        fcntl.flock(fd(file), fcntl.LOCK_UN)
+        fcntl.lockf(fd(file), fcntl.LOCK_UN)

I tried to manually reverse the changes from this commit (replacing flock() calls with lockf() calls), but it I still get the same error. There also are patches, but these patches seem to old (~7 years old and I use django 1.9 with python 3.5).

How could I solve this?

EDIT :

As plombix mentioned, my home directory is mounted on a NFS.

EDIT2 :

I also tried to replace the flock calls with fcntl.fcntl() calls and I got a different error :

OSError: [Errno 14] Bad address

Answer 1

You may want to specify that you are on a NFS file system ;P

lockf == flock UNSUPORTED by NFS

cf other post in stack "flock vs lockf"

If the semantics (behaviour over descriptor passing, forking, etc.) is acceptable, you should prefer lockf()/fcntl() locks over flock().

Locks in Linux, simply because the former works on NFS etc. filesystems, whereas the latter does not.

On BSDs and Mac OS X, I believe you need to explicitly use fcntl(), instead.

i suggest you redirect your operations over /temp or /goinfre/