Hi,

I've been working on solving this bug [1] for some time now. You can
find some of my research notes here [2]. I was recently able to
finally make it work.

The patch is based on Shirish's patch (available at [1]) to which I've
made the following modification:

- create disconnected root when any intermediary path are "not
  found" (ENOENT). Previously it was only done for EACCES errors.

- fix build_path_from_dentry() to correctly prefix dentry that are
  children of a disconnected root with the disconnected root actual
  path. This path is only avaible when using the struct rdelem linked
  list stored in the cifs superblock i.e. when we mount with
  noserverino.

So basically if you have the bug described in [1] you can solve it by
applying this patch and mounting with -o noserverino. I would like to
get rid this restriction (noserverino) and unconditionnaly use the
rdelem linked list but I don't know how feasible/safe that is (I'm still
new to all this stuff, this is my first kernel patch).

Shirish, I'd like to hear your comments if you have any. I've noticed
your find_rdelem_by_dentry() removes the dentry from the rdelem list
and I'm not sure I understand why. I've added and used
find_rdelem_by_dentry_no_del() to do the same thing without removing it.

1: https://bugzilla.samba.org/show_bug.cgi?id=8950
2: http://diobla.info/doc/suse-todo#bnc799133

-- 
Aurélien Aptel / SUSE Labs Samba Team
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