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, 2 insertions, 2 deletions

diff --git a/fs/compat.c b/fs/compat.c
index ee80ff341d37..a8d62375ada1 100644
--- a/fs/compat.c
+++ b/fs/compat.c
@@ -241,7 +241,7 @@ asmlinkage long compat_sys_statfs(const char __user *path, struct compat_statfs
         error = user_path_walk(path, &nd);
         if (!error) {
                 struct kstatfs tmp;
-                error = vfs_statfs(nd.dentry, &tmp);
+                error = vfs_statfs(nd.path.dentry, &tmp);
                 if (!error)
                         error = put_compat_statfs(buf, &tmp);
                 path_release(&nd);
@@ -309,7 +309,7 @@ asmlinkage long compat_sys_statfs64(const char __user *path, compat_size_t sz, s
         error = user_path_walk(path, &nd);
         if (!error) {
                 struct kstatfs tmp;
-                error = vfs_statfs(nd.dentry, &tmp);
+                error = vfs_statfs(nd.path.dentry, &tmp);
                 if (!error)
                         error = put_compat_statfs64(buf, &tmp);
                 path_release(&nd);