[PATCH 1/4] btrfs-progs: Introduce BTRFS_FEATURE_INCOMPAT_SPARE_DEV SB flags

[Anand Jain <anand.jain@oracle.com>]

Signed-off-by: Anand Jain <anand.jain@oracle.com>
---
 btrfs-show-super.c | 3 ++-
 ctree.h            | 4 +++-
 volumes.c          | 4 ++++
 volumes.h          | 2 ++
 4 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/btrfs-show-super.c b/btrfs-show-super.c
index 27414c8..d9626cd 100644
--- a/btrfs-show-super.c
+++ b/btrfs-show-super.c
@@ -300,7 +300,8 @@ struct readable_flag_entry incompat_flags_array[] = {
 	DEF_INCOMPAT_FLAG_ENTRY(EXTENDED_IREF),
 	DEF_INCOMPAT_FLAG_ENTRY(RAID56),
 	DEF_INCOMPAT_FLAG_ENTRY(SKINNY_METADATA),
-	DEF_INCOMPAT_FLAG_ENTRY(NO_HOLES)
+	DEF_INCOMPAT_FLAG_ENTRY(NO_HOLES),
+	DEF_INCOMPAT_FLAG_ENTRY(SPARE_DEV)
 };
 static const int incompat_flags_num = sizeof(incompat_flags_array) /
 				      sizeof(struct readable_flag_entry);
diff --git a/ctree.h b/ctree.h
index c57f9ca..2c3aea6 100644
--- a/ctree.h
+++ b/ctree.h
@@ -475,6 +475,7 @@ struct btrfs_super_block {
 #define BTRFS_FEATURE_INCOMPAT_RAID56		(1ULL << 7)
 #define BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA	(1ULL << 8)
 #define BTRFS_FEATURE_INCOMPAT_NO_HOLES		(1ULL << 9)
+#define BTRFS_FEATURE_INCOMPAT_SPARE_DEV	(1ULL << 10)
 
 
 #define BTRFS_FEATURE_COMPAT_SUPP		0ULL
@@ -488,7 +489,8 @@ struct btrfs_super_block {
 	 BTRFS_FEATURE_INCOMPAT_RAID56 |		\
 	 BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS |		\
 	 BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA |	\
-	 BTRFS_FEATURE_INCOMPAT_NO_HOLES)
+	 BTRFS_FEATURE_INCOMPAT_NO_HOLES |		\
+	 BTRFS_FEATURE_INCOMPAT_SPARE_DEV)
 
 /*
  * A leaf is full of items. offset and size tell us where to find
diff --git a/volumes.c b/volumes.c
index ca50f1c..beaeecf 100644
--- a/volumes.c
+++ b/volumes.c
@@ -101,6 +101,10 @@ static int device_list_add(const char *path,
 		fs_devices->latest_devid = devid;
 		fs_devices->latest_trans = found_transid;
 		fs_devices->lowest_devid = (u64)-1;
+		if (btrfs_super_incompat_flags(disk_super) &
+				BTRFS_FEATURE_INCOMPAT_SPARE_DEV)
+			fs_devices->spare = 1;
+
 		device = NULL;
 	} else {
 		device = __find_device(&fs_devices->devices, devid,
diff --git a/volumes.h b/volumes.h
index 4ecb993..3b56c1f 100644
--- a/volumes.h
+++ b/volumes.h
@@ -83,6 +83,8 @@ struct btrfs_fs_devices {
 
 	int seeding;
 	struct btrfs_fs_devices *seed;
+
+	int spare;
 };
 
 struct btrfs_bio_stripe {
-- 
2.4.1

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