btrfs: add raid stripe tree pretty printer

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

Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/print-tree.c b/fs/btrfs/print-tree.c
index 0c93439e929fb01405a6556d8d1f995418bb3c32..75042a7fcf30ef56718f2c80d5e86bcc404029c1 100644 (file)
--- a/fs/btrfs/print-tree.c
+++ b/fs/btrfs/print-tree.c
@@ -9,6 +9,8 @@
 #include "print-tree.h"
 #include "accessors.h"
 #include "tree-checker.h"
+#include "volumes.h"
+#include "raid-stripe-tree.h"
 
 struct root_name_map {
        u64 id;
@@ -28,6 +30,7 @@ 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 +192,22 @@ static void print_uuid_item(const struct extent_buffer *l, unsigned long offset,
        }
 }
 
+static void print_raid_stripe_key(const struct extent_buffer *eb, u32 item_size,
+                                 struct btrfs_stripe_extent *stripe)
+{
+       const int num_stripes = btrfs_num_raid_stripes(item_size);
+       const u8 encoding = btrfs_stripe_extent_encoding(eb, stripe);
+
+       pr_info("\t\t\tencoding: %s\n",
+               (encoding && encoding < BTRFS_NR_RAID_TYPES) ?
+               btrfs_raid_array[encoding].raid_name : "unknown");
+
+       for (int i = 0; i < num_stripes; i++)
+               pr_info("\t\t\tstride %d devid %llu physical %llu\n",
+                       i, btrfs_raid_stride_devid(eb, &stripe->strides[i]),
+                       btrfs_raid_stride_physical(eb, &stripe->strides[i]));
+}
+
 /*
  * Helper to output refs and locking status of extent buffer.  Useful to debug
  * race condition related problems.
@@ -349,6 +368,10 @@ 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;
                }
        }
 }