qstr: constify instances in autofs4

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/autofs4/root.c

@@ -159,7 +159,7 @@ static struct dentry *autofs4_lookup_active(struct dentry *dentry)
 {
 	struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
 	struct dentry *parent = dentry->d_parent;
-	struct qstr *name = &dentry->d_name;
+	const struct qstr *name = &dentry->d_name;
 	unsigned int len = name->len;
 	unsigned int hash = name->hash;
 	const unsigned char *str = name->name;
@@ -172,7 +172,7 @@ static struct dentry *autofs4_lookup_active(struct dentry *dentry)
 	list_for_each(p, head) {
 		struct autofs_info *ino;
 		struct dentry *active;
-		struct qstr *qstr;
+		const struct qstr *qstr;
 
 		ino = list_entry(p, struct autofs_info, active);
 		active = ino->dentry;
@@ -214,7 +214,7 @@ static struct dentry *autofs4_lookup_expiring(struct dentry *dentry,
 {
 	struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
 	struct dentry *parent = dentry->d_parent;
-	struct qstr *name = &dentry->d_name;
+	const struct qstr *name = &dentry->d_name;
 	unsigned int len = name->len;
 	unsigned int hash = name->hash;
 	const unsigned char *str = name->name;
@@ -227,7 +227,7 @@ static struct dentry *autofs4_lookup_expiring(struct dentry *dentry,
 	list_for_each(p, head) {
 		struct autofs_info *ino;
 		struct dentry *expiring;
-		struct qstr *qstr;
+		const struct qstr *qstr;
 
 		if (rcu_walk) {
 			spin_unlock(&sbi->lookup_lock);

fs/autofs4/waitq.c

@@ -225,7 +225,7 @@ rename_retry:
 }
 
 static struct autofs_wait_queue *
-autofs4_find_wait(struct autofs_sb_info *sbi, struct qstr *qstr)
+autofs4_find_wait(struct autofs_sb_info *sbi, const struct qstr *qstr)
 {
 	struct autofs_wait_queue *wq;
 
@@ -249,7 +249,7 @@ autofs4_find_wait(struct autofs_sb_info *sbi, struct qstr *qstr)
  */
 static int validate_request(struct autofs_wait_queue **wait,
 			    struct autofs_sb_info *sbi,
-			    struct qstr *qstr,
+			    const struct qstr *qstr,
 			    struct dentry *dentry, enum autofs_notify notify)
 {
 	struct autofs_wait_queue *wq;