[PATCH] btrfs-progs: Add dev uuid output for print_dev_item().

[Qu Wenruo <quwenruo@cn.fujitsu.com>]

The original print_dev_item() only prints device id,total bytes and
bytes used.
When it comes to debug things related to duplicated device id, dev uuid
is needed to distinguish different device since device is is no
reliable.

This patch added dev uuid output.

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
---
 print-tree.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/print-tree.c b/print-tree.c
index 574ae9e..cb5c2e1 100644
--- a/print-tree.c
+++ b/print-tree.c
@@ -179,11 +179,20 @@ void print_chunk(struct extent_buffer *eb, struct btrfs_chunk *chunk)
 static void print_dev_item(struct extent_buffer *eb,
 			   struct btrfs_dev_item *dev_item)
 {
+	char disk_uuid_c[BTRFS_UUID_UNPARSED_SIZE];
+	u8 disk_uuid[BTRFS_UUID_SIZE];
+
+	read_extent_buffer(eb, disk_uuid,
+			   (unsigned long)btrfs_device_uuid(dev_item),
+			   BTRFS_UUID_SIZE);
+	uuid_unparse(disk_uuid, disk_uuid_c);
 	printf("\t\tdev item devid %llu "
-	       "total_bytes %llu bytes used %Lu\n",
+	       "total_bytes %llu bytes used %Lu\n"
+	       "\t\tdev uuid %s\n",
 	       (unsigned long long)btrfs_device_id(eb, dev_item),
 	       (unsigned long long)btrfs_device_total_bytes(eb, dev_item),
-	       (unsigned long long)btrfs_device_bytes_used(eb, dev_item));
+	       (unsigned long long)btrfs_device_bytes_used(eb, dev_item),
+	       disk_uuid_c);
 }
 
 static void print_uuids(struct extent_buffer *eb)
-- 
1.9.3