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/ext4/super.c b/fs/ext4/super.c
index 0072da75221f..37117990073d 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -3158,12 +3158,12 @@ static int ext4_quota_on(struct super_block *sb, int type, int format_id,
         if (err)
                 return err;
         /* Quotafile not on the same filesystem? */
-        if (nd.mnt->mnt_sb != sb) {
+        if (nd.path.mnt->mnt_sb != sb) {
                 path_release(&nd);
                 return -EXDEV;
         }
         /* Quotafile not of fs root? */
-        if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode)
+        if (nd.path.dentry->d_parent->d_inode != sb->s_root->d_inode)
                 printk(KERN_WARNING
                         "EXT4-fs: Quota file not on filesystem root. "
                         "Journalled quota will not work.\n");