[RFC ONLY 3/6] btrfs-progs: add dump tree support for the raid stripe tree

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

Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
---
 cmds/inspect-dump-tree.c   |  5 +++++
 kernel-shared/ctree.h      |  3 +++
 kernel-shared/print-tree.c | 27 +++++++++++++++++++++++++++
 3 files changed, 35 insertions(+)

diff --git a/cmds/inspect-dump-tree.c b/cmds/inspect-dump-tree.c
index daa7f9255139..999047ea0c28 100644
--- a/cmds/inspect-dump-tree.c
+++ b/cmds/inspect-dump-tree.c
@@ -163,6 +163,7 @@ static u64 treeid_from_string(const char *str, const char **end)
 		{ "TREE_RELOC", BTRFS_TREE_RELOC_OBJECTID },
 		{ "DATA_RELOC", BTRFS_DATA_RELOC_TREE_OBJECTID },
 		{ "BLOCK_GROUP_TREE", BTRFS_BLOCK_GROUP_TREE_OBJECTID },
+		{ "RAID_STRIPE", BTRFS_RAID_STRIPE_TREE_OBJECTID },
 	};
 
 	if (strncasecmp("BTRFS_", str, strlen("BTRFS_")) == 0)
@@ -728,6 +729,10 @@ again:
 				if (!skip)
 					printf("block group");
 				break;
+			case BTRFS_RAID_STRIPE_TREE_OBJECTID:
+				if (!skip)
+					printf("raid stripe");
+				break;
 			default:
 				if (!skip) {
 					printf("file");
diff --git a/kernel-shared/ctree.h b/kernel-shared/ctree.h
index 56b3185001af..40e5e09897b1 100644
--- a/kernel-shared/ctree.h
+++ b/kernel-shared/ctree.h
@@ -1493,6 +1493,9 @@ static inline u32 BTRFS_MAX_XATTR_SIZE(const struct btrfs_fs_info *info)
 #define BTRFS_QGROUP_LIMIT_KEY		244
 #define BTRFS_QGROUP_RELATION_KEY	246
 
+
+#define BTRFS_RAID_STRIPE_KEY		247
+
 /*
  * Obsolete name, see BTRFS_TEMPORARY_ITEM_KEY.
  */
diff --git a/kernel-shared/print-tree.c b/kernel-shared/print-tree.c
index 9c12dfcb4ca5..d1b51065c2f3 100644
--- a/kernel-shared/print-tree.c
+++ b/kernel-shared/print-tree.c
@@ -635,6 +635,26 @@ static void print_free_space_header(struct extent_buffer *leaf, int slot)
 	       (unsigned long long)btrfs_free_space_bitmaps(leaf, header));
 }
 
+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 = (item_size - offsetof(struct btrfs_dp_stripe, extents)) /
+		sizeof(struct btrfs_stripe_extent);
+
+	printf("\t\tlogical %llu, size: %llu\n",
+	       (unsigned long long)btrfs_dp_stripe_logical(eb, stripe),
+	       (unsigned long long)btrfs_dp_stripe_size(eb, stripe));
+
+	for (i = 0; i < num_stripes; i++)
+		printf("\t\t\tstripe %d devid %llu offset %llu\n", i,
+		       (unsigned long long)btrfs_stripe_extent_devid_nr(eb, stripe, i),
+		       (unsigned long long)btrfs_stripe_extent_offset_nr(eb, stripe, i));
+}
+
 void print_key_type(FILE *stream, u64 objectid, u8 type)
 {
 	static const char* key_to_str[256] = {
@@ -679,6 +699,7 @@ void print_key_type(FILE *stream, u64 objectid, u8 type)
 		[BTRFS_PERSISTENT_ITEM_KEY]	= "PERSISTENT_ITEM",
 		[BTRFS_UUID_KEY_SUBVOL]		= "UUID_KEY_SUBVOL",
 		[BTRFS_UUID_KEY_RECEIVED_SUBVOL] = "UUID_KEY_RECEIVED_SUBVOL",
+		[BTRFS_RAID_STRIPE_KEY]		= "RAID_STRIPE_KEY",
 	};
 
 	if (type == 0 && objectid == BTRFS_FREE_SPACE_OBJECTID) {
@@ -788,6 +809,9 @@ void print_objectid(FILE *stream, u64 objectid, u8 type)
 	case BTRFS_BLOCK_GROUP_TREE_OBJECTID:
 		fprintf(stream, "BLOCK_GROUP_TREE");
 		break;
+	case  BTRFS_RAID_STRIPE_TREE_OBJECTID:
+		fprintf(stream, "RAID_STRIPE_TREE");
+		break;
 	case (u64)-1:
 		fprintf(stream, "-1");
 		break;
@@ -1453,6 +1477,9 @@ void btrfs_print_leaf(struct extent_buffer *eb, unsigned int mode)
 		case BTRFS_TEMPORARY_ITEM_KEY:
 			print_temporary_item(eb, ptr, objectid, offset);
 			break;
+		case BTRFS_RAID_STRIPE_KEY:
+			print_raid_stripe_key(eb, item_size, ptr);
+			break;
 		};
 		fflush(stdout);
 	}
-- 
2.35.3