[AFS]: Add "directory write" support.

Add support for the create, link, symlink, unlink, mkdir, rmdir and
rename VFS operations to the in-kernel AFS filesystem.

Also:

 (1) Fix dentry and inode revalidation.  d_revalidate should only look at
     state of the dentry.  Revalidation of the contents of an inode pointed to
     by a dentry is now separate.

 (2) Fix afs_lookup() to hash negative dentries as well as positive ones.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --cc fs/afs/afs.h
Simple merge

diff --cc fs/afs/afs_fs.h
Simple merge

diff --cc fs/afs/callback.c
Simple merge

diff --cc fs/afs/dir.c
Simple merge

diff --cc fs/afs/file.c
Simple merge

diff --cc fs/afs/fsclient.c
Simple merge

diff --cc fs/afs/inode.c
Simple merge

diff --cc fs/afs/internal.h
Simple merge

diff --cc fs/afs/misc.c
Simple merge

diff --cc fs/afs/security.c
Simple merge

diff --cc fs/afs/server.c
Simple merge

diff --cc fs/afs/super.c
Simple merge

diff --cc fs/afs/vnode.c
Simple merge

diff --cc fs/afs/volume.c
Simple merge