[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>

1 files changed, 7 insertions, 0 deletions

diff --git a/fs/afs/file.c b/fs/afs/file.c
index 101bbb8c0d8b..ae256498f4f7 100644
--- a/fs/afs/file.c
+++ b/fs/afs/file.c
@@ -50,6 +50,7 @@ int afs_open(struct inode *inode, struct file *file)
 {
         struct afs_vnode *vnode = AFS_FS_I(inode);
         struct key *key;
+        int ret;
 
         _enter("{%x:%x},", vnode->fid.vid, vnode->fid.vnode);
 
@@ -59,6 +60,12 @@ int afs_open(struct inode *inode, struct file *file)
                 return PTR_ERR(key);
         }
 
+        ret = afs_validate(vnode, key);
+        if (ret < 0) {
+                _leave(" = %d [val]", ret);
+                return ret;
+        }
+
         file->private_data = key;
         _leave(" = 0");
         return 0;