Embed a struct path into struct nameidata instead of nd->{dentry,mnt}

This is the central patch of a cleanup series. In most cases there is no good
reason why someone would want to use a dentry for itself. This series reflects
that fact and embeds a struct path into nameidata.

Together with the other patches of this series
- it enforced the correct order of getting/releasing the reference count on
  <dentry,vfsmount> pairs
- it prepares the VFS for stacking support since it is essential to have a
  struct path in every place where the stack can be traversed
- it reduces the overall code size:

without patch series:
   text    data     bss     dec     hex filename
5321639  858418  715768 6895825  6938d1 vmlinux

with patch series:
   text    data     bss     dec     hex filename
5320026  858418  715768 6894212  693284 vmlinux

This patch:

Switch from nd->{dentry,mnt} to nd->path.{dentry,mnt} everywhere.

[akpm@linux-foundation.org: coding-style fixes]
[akpm@linux-foundation.org: fix cifs]
[akpm@linux-foundation.org: fix smack]
Signed-off-by: Jan Blunck <jblunck@suse.de>
Signed-off-by: Andreas Gruenbacher <agruen@suse.de>
Acked-by: Christoph Hellwig <hch@lst.de>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Casey Schaufler <casey@schaufler-ca.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 3 insertions, 2 deletions

diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c
index 0e3ead7e11b9..6bc3babf6175 100644
--- a/net/sunrpc/rpc_pipe.c
+++ b/net/sunrpc/rpc_pipe.c
@@ -668,7 +668,8 @@ rpc_lookup_negative(char *path, struct nameidata *nd)
 
         if ((error = rpc_lookup_parent(path, nd)) != 0)
                 return ERR_PTR(error);
-        dentry = rpc_lookup_create(nd->dentry, nd->last.name, nd->last.len, 1);
+        dentry = rpc_lookup_create(nd->path.dentry, nd->last.name, nd->last.len,
+                                   1);
         if (IS_ERR(dentry))
                 rpc_release_path(nd);
         return dentry;
@@ -695,7 +696,7 @@ rpc_mkdir(char *path, struct rpc_clnt *rpc_client)
         dentry = rpc_lookup_negative(path, &nd);
         if (IS_ERR(dentry))
                 return dentry;
-        dir = nd.dentry->d_inode;
+        dir = nd.path.dentry->d_inode;
         if ((error = __rpc_mkdir(dir, dentry)) != 0)
                 goto err_dput;
         RPC_I(dentry->d_inode)->private = rpc_client;