->encode_fh() API change

pass inode + parent's inode or NULL instead of dentry + bool saying
whether we want the parent or not.

NOTE: that needs ceph fix folded in.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/mm/cleancache.c b/mm/cleancache.c
index 5646c74..32e6f41 100644
--- a/mm/cleancache.c
+++ b/mm/cleancache.c
@@ -80,7 +80,7 @@
 static int cleancache_get_key(struct inode *inode,
 			      struct cleancache_filekey *key)
 {
-	int (*fhfn)(struct dentry *, __u32 *fh, int *, int);
+	int (*fhfn)(struct inode *, __u32 *fh, int *, struct inode *);
 	int len = 0, maxlen = CLEANCACHE_KEY_MAX;
 	struct super_block *sb = inode->i_sb;
 
@@ -88,9 +88,7 @@
 	if (sb->s_export_op != NULL) {
 		fhfn = sb->s_export_op->encode_fh;
 		if  (fhfn) {
-			struct dentry d;
-			d.d_inode = inode;
-			len = (*fhfn)(&d, &key->u.fh[0], &maxlen, 0);
+			len = (*fhfn)(inode, &key->u.fh[0], &maxlen, NULL);
 			if (len <= 0 || len == 255)
 				return -1;
 			if (maxlen > CLEANCACHE_KEY_MAX)