btrfsprogs/0018-btrfs-progs-read-global-reserve-size-from-space-info.patch

From 28c2061817b8cb266458249cc7bdd770eb2b407b Mon Sep 17 00:00:00 2001
From: David Sterba <dsterba@suse.cz>
Date: Thu, 16 Jan 2014 14:18:37 +0100
Subject: [PATCH 29/42] btrfs-progs: read global reserve size from space infos

Kernels >= 3.15 export the global block reserve as a space info presented
by 'btrfs fi df' but would display 'unknown' instead of some meaningful
string.

Signed-off-by: David Sterba <dsterba@suse.cz>
---
 ctree.h | 6 ++++++
 utils.c | 7 ++++++-
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/utils.c b/utils.c
index f2ab416c28b2..ca150404ea6f 100644
--- a/utils.c
+++ b/utils.c
@@ -2473,7 +2473,10 @@ u64 get_partition_size(char *dev)
  */
 const char *group_type_str(u64 flag)
 {
-	switch (flag & BTRFS_BLOCK_GROUP_TYPE_MASK) {
+	u64 mask = BTRFS_BLOCK_GROUP_TYPE_MASK |
+		BTRFS_SPACE_INFO_GLOBAL_RSV;
+
+	switch (flag & mask) {
 	case BTRFS_BLOCK_GROUP_DATA:
 		return "Data";
 	case BTRFS_BLOCK_GROUP_SYSTEM:
@@ -2482,6 +2485,8 @@ const char *group_type_str(u64 flag)
 		return "Metadata";
 	case BTRFS_BLOCK_GROUP_DATA|BTRFS_BLOCK_GROUP_METADATA:
 		return "Data+Metadata";
+	case BTRFS_SPACE_INFO_GLOBAL_RSV:
+		return "GlobalReserve";
 	default:
 		return "unknown";
 	}
-- 
1.9.0