qstr: constify instances in fuse

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

fs/fuse/dir.c

@@ -146,7 +146,7 @@ static void fuse_invalidate_entry(struct dentry *entry)
 }
 
 static void fuse_lookup_init(struct fuse_conn *fc, struct fuse_args *args,
-			     u64 nodeid, struct qstr *name,
+			     u64 nodeid, const struct qstr *name,
 			     struct fuse_entry_out *outarg)
 {
 	memset(outarg, 0, sizeof(struct fuse_entry_out));
@@ -282,7 +282,7 @@ int fuse_valid_type(int m)
 		S_ISBLK(m) || S_ISFIFO(m) || S_ISSOCK(m);
 }
 
-int fuse_lookup_name(struct super_block *sb, u64 nodeid, struct qstr *name,
+int fuse_lookup_name(struct super_block *sb, u64 nodeid, const struct qstr *name,
 		     struct fuse_entry_out *outarg, struct inode **inode)
 {
 	struct fuse_conn *fc = get_fuse_conn_super(sb);

fs/fuse/fuse_i.h

@@ -703,7 +703,7 @@ struct inode *fuse_iget(struct super_block *sb, u64 nodeid,
 			int generation, struct fuse_attr *attr,
 			u64 attr_valid, u64 attr_version);
 
-int fuse_lookup_name(struct super_block *sb, u64 nodeid, struct qstr *name,
+int fuse_lookup_name(struct super_block *sb, u64 nodeid, const struct qstr *name,
 		     struct fuse_entry_out *outarg, struct inode **inode);
 
 /**

fs/fuse/inode.c

@@ -673,13 +673,11 @@ static struct dentry *fuse_get_dentry(struct super_block *sb,
 	inode = ilookup5(sb, handle->nodeid, fuse_inode_eq, &handle->nodeid);
 	if (!inode) {
 		struct fuse_entry_out outarg;
-		struct qstr name;
+		const struct qstr name = QSTR_INIT(".", 1);
 
 		if (!fc->export_support)
 			goto out_err;
 
-		name.len = 1;
-		name.name = ".";
 		err = fuse_lookup_name(sb, handle->nodeid, &name, &outarg,
 				       &inode);
 		if (err && err != -ENOENT)
@@ -775,14 +773,12 @@ static struct dentry *fuse_get_parent(struct dentry *child)
 	struct inode *inode;
 	struct dentry *parent;
 	struct fuse_entry_out outarg;
-	struct qstr name;
+	const struct qstr name = QSTR_INIT("..", 2);
 	int err;
 
 	if (!fc->export_support)
 		return ERR_PTR(-ESTALE);
 
-	name.len = 2;
-	name.name = "..";
 	err = fuse_lookup_name(child_inode->i_sb, get_node_id(child_inode),
 			       &name, &outarg, &inode);
 	if (err) {