mufs: implement mufs_rename() to move files and directories

include/fs/mufs.h

@@ -43,6 +43,7 @@ int mufs_format(struct flash_dev *dev);
 
 char *mufs_abspath(const char *path);
 int mufs_stat(struct mufs *fs, const char *path, struct mufs_stat *stat);
+int mufs_rename(struct mufs *fs, const char *old, const char *new);
 
 struct mufs_dir *mufs_opendir(struct mufs *fs, const char *path);
 void mufs_closedir(struct mufs_dir *dir);

source/fs/mufs/path.c

@@ -137,3 +137,64 @@ int mufs_stat(struct mufs *fs, const char *path, struct mufs_stat *stat)
 
 	return 0;
 }
+
+int mufs_rename(struct mufs *fs, const char *old, const char *new)
+{
+	struct mufs_stat stat;
+	struct mufs_dirent dirent;
+	struct mufs_tree *tree;
+	size_t len;
+	char *full_old, *full_new;
+	char *name;
+	int ret = -1;
+
+	if (!(full_new = mufs_abspath(new)))
+		return -1;
+
+	if (resolve_path(fs, full_new, NULL))
+		goto err_free_new;
+
+	if (!(full_old = mufs_abspath(old)))
+		goto err_free_new;
+
+	name = strrchr(full_new, '/');
+	*name++ = '\0';
+
+	if (*full_new == '\0')
+		full_new = "/";
+
+	if (*name == '\0')
+		goto err_free_old;
+
+	if (!(tree = resolve_path(fs, full_old, &stat)))
+		goto err_free_old;
+
+	len = min(strlen(name), sizeof(dirent.path) - 1);
+	memcpy(dirent.path, name, len);
+	dirent.path[len] = '\0';
+	dirent.type = stat.type;
+
+	dirent.tree.fs = fs;
+	dirent.tree.file_size = tree->file_size;
+	dirent.tree.root = tree->root;
+	dirent.tree.depth = tree->depth;
+
+	if (!is_aligned(tree->file_size, fs->dev->log2_block_size) &&
+		write_dirent(tree, tree->file_size, &dirent) > 0)
+		goto err_free_old;
+
+	if (write_dirent(tree, align_up(tree->file_size,
+		fs->dev->log2_block_size), &dirent) > 0)
+		goto err_free_old;
+
+	if (mufs_rmpath(fs, full_old) < 0)
+		goto err_free_old;
+
+	ret = 0;
+
+err_free_old:
+	free(full_old);
+err_free_new:
+	free(full_new);
+	return ret;
+}