/*
 * test module to try and submit one single 4K bio
 * with multiple bvecs
 */

#define pr_fmt(fmt) "hello-debugfs: " fmt

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/debugfs.h>
#include <linux/stat.h>

#define MODULE_NAME "hello-debugfs"
MODULE_VERSION("1.0");

MODULE_AUTHOR("Lars Ellenberg <lars@linbit.com>");
MODULE_DESCRIPTION("hello-debugfs - to excercise debugfs_remove_recursive");
MODULE_LICENSE("GPL");

static struct dentry *debug_dir;

struct hello_entry {
	int s_ifmt;
	char *d_iname;
	u32 value;
};

struct hello_entry tree[] = {
	{ S_IFDIR, "dir1" },
	{ S_IFREG, "file1", 1 },
	{ S_IFREG, "file2", 2 },
	{ S_IFREG, "file3", 3 },
	{ S_IFREG, "file4", 4 },
	{ S_IFDIR, "dir2" },
	{ S_IFREG, "file5", 5 },
	{ S_IFDIR, /* .. */ },
	{ S_IFDIR, "dir3" },
	{ S_IFREG, "file6", 6 },
	{ S_IFREG, "file7", 7 },
	{ S_IFREG, "file8", 8 },
	{ S_IFREG, "file9", 9 },
};

int __init hello_debugfs(void)
{
	struct dentry *dir;
	int i;

	debug_dir = debugfs_create_dir("hello-debugfs", NULL);
	if (IS_ERR_OR_NULL(debug_dir)) {
		pr_info("sorry, failed to create my top level dir\n");
		if (debug_dir)
			return PTR_ERR(debug_dir);
		else
			return -EINVAL;
	}

	dir = debug_dir;
	for (i = 0; i < ARRAY_SIZE(tree); i++) {
		struct hello_entry *e = tree+i;
		switch(e->s_ifmt & S_IFMT) {
		default:
			continue;
		case S_IFDIR:
			if (!e->d_iname) {
				if (dir != debug_dir)
					dir = dir->d_parent;
			} else
				dir = debugfs_create_dir(e->d_iname, dir);
			break;
		case S_IFREG:
			debugfs_create_u32(e->d_iname, 0444, dir, &e->value);
			break;
		}
	}

	return 0;
}

static void good_bye_debugfs(void)
{
	debugfs_remove_recursive(debug_dir);
}

module_init(hello_debugfs)
module_exit(good_bye_debugfs)