d_path: Make d_path() use a struct path

d_path() is used on a <dentry,vfsmount> pair.  Lets use a struct path to
reflect this.

[akpm@linux-foundation.org: fix build in mm/memory.c]
Signed-off-by: Jan Blunck <jblunck@suse.de>
Acked-by: Bryan Wu <bryan.wu@analog.com>
Acked-by: Christoph Hellwig <hch@infradead.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: "J. Bruce Fields" <bfields@fieldses.org>
Cc: Neil Brown <neilb@suse.de>
Cc: Michael Halcrow <mhalcrow@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/seq_file.c b/fs/seq_file.c
index 8d86290..8537702 100644
--- a/fs/seq_file.c
+++ b/fs/seq_file.c
@@ -346,8 +346,7 @@
 {
 	if (m->count < m->size) {
 		char *s = m->buf + m->count;
-		char *p = d_path(path->dentry, path->mnt, s,
-				 m->size - m->count);
+		char *p = d_path(path, s, m->size - m->count);
 		if (!IS_ERR(p)) {
 			while (s <= p) {
 				char c = *p++;