From c0029e4e25c10d627f4bff62cdb4074bb2c7eaf7 Mon Sep 17 00:00:00 2001
From: Heinrich Schuchardt
Date: Thu, 31 Dec 2020 00:38:13 +0100
Subject: fs/fat: implement fsuuid command

The FAT file system does not have a UUID but a 4 byte volume ID.
Let the fsuuid command show it in XXXX-XXXX format.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
---
 fs/fat/fat.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

(limited to 'fs/fat/fat.c')

diff --git a/fs/fat/fat.c b/fs/fat/fat.c
index c9742d534bb..157dad60a48 100644
--- a/fs/fat/fat.c
+++ b/fs/fat/fat.c
@@ -1377,3 +1377,21 @@ void fat_closedir(struct fs_dir_stream *dirs)
 void fat_close(void)
 {
 }
+
+int fat_uuid(char *uuid_str)
+{
+	boot_sector bs;
+	volume_info volinfo;
+	int fatsize;
+	int ret;
+	u8 *id;
+
+	ret = read_bootsectandvi(&bs, &volinfo, &fatsize);
+	if (ret)
+		return ret;
+
+	id = volinfo.volume_id;
+	sprintf(uuid_str, "%02X%02X-%02X%02X", id[3], id[2], id[1], id[0]);
+
+	return 0;
+}
-- 
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