[PATCH v8 08/11] btrfs: add raid stripe tree pretty printer

[Johannes Thumshirn]

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

Signed-off-by: Johannes Thumshirn <johannes.thumshirn@xxxxxxx>
---
 fs/btrfs/print-tree.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)

diff --git a/fs/btrfs/print-tree.c b/fs/btrfs/print-tree.c
index 0c93439e929f..f01919e4bb37 100644
--- a/fs/btrfs/print-tree.c
+++ b/fs/btrfs/print-tree.c
@@ -9,6 +9,7 @@
 #include "print-tree.h"
 #include "accessors.h"
 #include "tree-checker.h"
+#include "raid-stripe-tree.h"
 
 struct root_name_map {
 	u64 id;
@@ -28,6 +29,7 @@ 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)
@@ -189,6 +191,48 @@ static void print_uuid_item(const struct extent_buffer *l, unsigned long offset,
 	}
 }
 
+struct raid_encoding_map {
+	u8 encoding;
+	char name[16];
+};
+
+static const struct raid_encoding_map raid_map[] = {
+	{ BTRFS_STRIPE_DUP,	"DUP" },
+	{ BTRFS_STRIPE_RAID0,	"RAID0" },
+	{ BTRFS_STRIPE_RAID1,	"RAID1" },
+	{ BTRFS_STRIPE_RAID1C3,	"RAID1C3" },
+	{ BTRFS_STRIPE_RAID1C4, "RAID1C4" },
+	{ BTRFS_STRIPE_RAID5,	"RAID5" },
+	{ BTRFS_STRIPE_RAID6,	"RAID6" },
+	{ BTRFS_STRIPE_RAID10,	"RAID10" }
+};
+
+static const char *stripe_encoding_name(u8 encoding)
+{
+	for (int i = 0; i < ARRAY_SIZE(raid_map); i++) {
+		if (raid_map[i].encoding == encoding)
+			return raid_map[i].name;
+	}
+
+	return "UNKNOWN";
+}
+
+static void print_raid_stripe_key(const struct extent_buffer *eb, u32 item_size,
+				  struct btrfs_stripe_extent *stripe)
+{
+	int num_stripes = btrfs_num_raid_stripes(item_size);
+	u8 encoding = btrfs_stripe_extent_encoding(eb, stripe);
+	int i;
+
+	pr_info("\t\t\tencoding: %s\n", stripe_encoding_name(encoding));
+
+	for (i = 0; i < num_stripes; i++)
+		pr_info("\t\t\tstride %d devid %llu physical %llu length %llu\n",
+			i, btrfs_raid_stride_devid(eb, &stripe->strides[i]),
+			btrfs_raid_stride_physical(eb, &stripe->strides[i]),
+			btrfs_raid_stride_length(eb, &stripe->strides[i]));
+}
+
 /*
  * Helper to output refs and locking status of extent buffer.  Useful to debug
  * race condition related problems.
@@ -349,6 +393,11 @@ void btrfs_print_leaf(const 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_stripe_extent));
+			break;
 		}
 	}
 }

-- 
2.41.0