From 9d845509553e3c07414259ea97e4f59a3fe65904 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marek=20Beh=C3=BAn?= <marek.behun@nic.cz>
Date: Sun, 3 Sep 2017 17:00:30 +0200
Subject: [PATCH] cmd: Add the 'btrsubvol' command to list BTRFS subvolumes

Signed-off-by: Marek Behun <marek.behun@nic.cz>

 create mode 100644 cmd/btrfs.c
---
 cmd/Kconfig  | 10 ++++++++++
 cmd/Makefile |  1 +
 cmd/btrfs.c  | 28 ++++++++++++++++++++++++++++
 3 files changed, 39 insertions(+)
 create mode 100644 cmd/btrfs.c

diff --git a/cmd/Kconfig b/cmd/Kconfig
index 3ef9b16..07ec03b 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -1313,6 +1313,16 @@ config CMD_CROS_EC
 endmenu
 
 menu "Filesystem commands"
+config CMD_BTRFS
+	bool "Enable the 'btrsubvol' command"
+	select FS_BTRFS
+	help
+	  This enables the 'btrsubvol' command to list subvolumes
+	  of a BTRFS filesystem. There are no special commands for
+	  listing BTRFS directories or loading BTRFS files - this
+	  can be done by the generic 'fs' commands (see CMD_FS_GENERIC)
+	  when BTRFS is enabled (see FS_BTRFS).
+
 config CMD_CBFS
 	bool "Enable the 'cbfs' command"
 	depends on FS_CBFS
diff --git a/cmd/Makefile b/cmd/Makefile
index 2a5b8ce..2b0444d 100644
--- a/cmd/Makefile
+++ b/cmd/Makefile
@@ -27,6 +27,7 @@ obj-$(CONFIG_CMD_BOOTMENU) += bootmenu.o
 obj-$(CONFIG_CMD_BOOTSTAGE) += bootstage.o
 obj-$(CONFIG_CMD_BOOTZ) += bootz.o
 obj-$(CONFIG_CMD_BOOTI) += booti.o
+obj-$(CONFIG_CMD_BTRFS) += btrfs.o
 obj-$(CONFIG_CMD_CACHE) += cache.o
 obj-$(CONFIG_CMD_CBFS) += cbfs.o
 obj-$(CONFIG_CMD_CLK) += clk.o
diff --git a/cmd/btrfs.c b/cmd/btrfs.c
new file mode 100644
index 0000000..3f4f1b7
--- /dev/null
+++ b/cmd/btrfs.c
@@ -0,0 +1,28 @@
+/*
+ * 2017 by Marek Behun <marek.behun@nic.cz>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <command.h>
+#include <btrfs.h>
+#include <fs.h>
+
+int do_btrsubvol(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
+{
+	if (argc != 3)
+		return CMD_RET_USAGE;
+
+	if (fs_set_blk_dev(argv[1], argv[2], FS_TYPE_BTRFS))
+		return 1;
+
+	btrfs_list_subvols();
+	return 0;
+}
+
+U_BOOT_CMD(btrsubvol, 3, 1, do_btrsubvol,
+	"list subvolumes of a BTRFS filesystem",
+	"<interface> <dev[:part]>\n"
+	"     - List subvolumes of a BTRFS filesystem."
+)