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, 11 insertions, 11 deletions

diff --git a/fs/afs/mntpt.c b/fs/afs/mntpt.c
index 5ce43b63c60e..4136dfb9ffb8 100644
--- a/fs/afs/mntpt.c
+++ b/fs/afs/mntpt.c
@@ -218,14 +218,14 @@ static void *afs_mntpt_follow_link(struct dentry *dentry, struct nameidata *nd)
 	_enter("%p{%s},{%s:%p{%s},}",
 	       dentry,
 	       dentry->d_name.name,
-	       nd->mnt->mnt_devname,
+	       nd->path.mnt->mnt_devname,
 	       dentry,
-	       nd->dentry->d_name.name);
+	       nd->path.dentry->d_name.name);
 
-	dput(nd->dentry);
-	nd->dentry = dget(dentry);
+	dput(nd->path.dentry);
+	nd->path.dentry = dget(dentry);
 
-	newmnt = afs_mntpt_do_automount(nd->dentry);
+	newmnt = afs_mntpt_do_automount(nd->path.dentry);
 	if (IS_ERR(newmnt)) {
 		path_release(nd);
 		return (void *)newmnt;
@@ -235,17 +235,17 @@ static void *afs_mntpt_follow_link(struct dentry *dentry, struct nameidata *nd)
 	err = do_add_mount(newmnt, nd, MNT_SHRINKABLE, &afs_vfsmounts);
 	switch (err) {
 	case 0:
-		dput(nd->dentry);
-		mntput(nd->mnt);
-		nd->mnt = newmnt;
-		nd->dentry = dget(newmnt->mnt_root);
+		dput(nd->path.dentry);
+		mntput(nd->path.mnt);
+		nd->path.mnt = newmnt;
+		nd->path.dentry = dget(newmnt->mnt_root);
 		schedule_delayed_work(&afs_mntpt_expiry_timer,
 				      afs_mntpt_expiry_timeout * HZ);
 		break;
 	case -EBUSY:
 		/* someone else made a mount here whilst we were busy */
-		while (d_mountpoint(nd->dentry) &&
-		       follow_down(&nd->mnt, &nd->dentry))
+		while (d_mountpoint(nd->path.dentry) &&
+		       follow_down(&nd->path.mnt, &nd->path.dentry))
 			;
 		err = 0;
 	default: