[RFC ONLY 8/8] btrfs: add raid stripe tree pretty printer

[Johannes Thumshirn <johannes.thumshirn@wdc.com>]

Decode raid-stripe-tree entries on btrfs_print_tree().

Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
---
 fs/btrfs/print-tree.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/fs/btrfs/print-tree.c b/fs/btrfs/print-tree.c
index dd8777872143..1ee06b511951 100644
--- a/fs/btrfs/print-tree.c
+++ b/fs/btrfs/print-tree.c
@@ -6,6 +6,7 @@
 #include "ctree.h"
 #include "disk-io.h"
 #include "print-tree.h"
+#include "raid-stripe-tree.h"
 
 struct root_name_map {
 	u64 id;
@@ -25,6 +26,7 @@ static const struct root_name_map root_map[] = {
 	{ BTRFS_FREE_SPACE_TREE_OBJECTID,	"FREE_SPACE_TREE"	},
 	{ BTRFS_BLOCK_GROUP_TREE_OBJECTID,	"BLOCK_GROUP_TREE"	},
 	{ BTRFS_DATA_RELOC_TREE_OBJECTID,	"DATA_RELOC_TREE"	},
+	{ BTRFS_RAID_STRIPE_TREE_OBJECTID,	"RAID_STRIPE_TREE"	},
 };
 
 const char *btrfs_root_name(const struct btrfs_key *key, char *buf)
@@ -184,6 +186,20 @@ static void print_uuid_item(struct extent_buffer *l, unsigned long offset,
 	}
 }
 
+static void print_raid_stripe_key(struct extent_buffer *eb, u32 item_size,
+				  struct btrfs_dp_stripe *stripe)
+{
+	int num_stripes;
+	int i;
+
+	num_stripes = btrfs_num_raid_stripes(item_size);
+
+	for (i = 0; i < num_stripes; i++)
+		pr_info("\t\t\tstripe %d devid %llu offset %llu\n", i,
+			btrfs_stripe_extent_devid_nr(eb, stripe, i),
+			btrfs_stripe_extent_offset_nr(eb, stripe, i));
+}
+
 /*
  * Helper to output refs and locking status of extent buffer.  Useful to debug
  * race condition related problems.
@@ -348,6 +364,11 @@ void btrfs_print_leaf(struct extent_buffer *l)
 			print_uuid_item(l, btrfs_item_ptr_offset(l, i),
 					btrfs_item_size(l, i));
 			break;
+		case BTRFS_RAID_STRIPE_KEY:
+			print_raid_stripe_key(l, btrfs_item_size(l, i),
+					      btrfs_item_ptr(l, i,
+							     struct btrfs_dp_stripe));
+			break;
 		}
 	}
 }
-- 
2.35.1