kill dentry_update_name_case()

the last user is gone
Spotted-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/dcache.c

@@ -2676,33 +2676,6 @@ struct dentry *d_exact_alias(struct dentry *entry, struct inode *inode)
 }
 EXPORT_SYMBOL(d_exact_alias);
 
-/**
- * dentry_update_name_case - update case insensitive dentry with a new name
- * @dentry: dentry to be updated
- * @name: new name
- *
- * Update a case insensitive dentry with new case of name.
- *
- * dentry must have been returned by d_lookup with name @name. Old and new
- * name lengths must match (ie. no d_compare which allows mismatched name
- * lengths).
- *
- * Parent inode i_mutex must be held over d_lookup and into this call (to
- * keep renames and concurrent inserts, and readdir(2) away).
- */
-void dentry_update_name_case(struct dentry *dentry, const struct qstr *name)
-{
-	BUG_ON(!inode_is_locked(dentry->d_parent->d_inode));
-	BUG_ON(dentry->d_name.len != name->len); /* d_lookup gives this */
-
-	spin_lock(&dentry->d_lock);
-	write_seqcount_begin(&dentry->d_seq);
-	memcpy((unsigned char *)dentry->d_name.name, name->name, name->len);
-	write_seqcount_end(&dentry->d_seq);
-	spin_unlock(&dentry->d_lock);
-}
-EXPORT_SYMBOL(dentry_update_name_case);
-
 static void swap_names(struct dentry *dentry, struct dentry *target)
 {
 	if (unlikely(dname_external(target))) {

include/linux/dcache.h

@@ -271,8 +271,6 @@ extern void d_rehash(struct dentry *);
  
 extern void d_add(struct dentry *, struct inode *);
 
-extern void dentry_update_name_case(struct dentry *, const struct qstr *);
-
 /* used for rename() and baskets */
 extern void d_move(struct dentry *, struct dentry *);
 extern void d_exchange(struct dentry *, struct dentry *);