Btrfs: support printing UUID tree elements

This commit adds support to print UUID tree elements to print-tree.c.

Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>

1 files changed, 24 insertions, 0 deletions

diff --git a/fs/btrfs/print-tree.c b/fs/btrfs/print-tree.c
index fe7bf4a12568..32022f3f169b 100644
--- a/fs/btrfs/print-tree.c
+++ b/fs/btrfs/print-tree.c
@@ -155,6 +155,25 @@ static void print_extent_ref_v0(struct extent_buffer *eb, int slot)
 }
 #endif
 
+static void print_uuid_item(struct extent_buffer *l, unsigned long offset,
+                            u32 item_size)
+{
+        if (!IS_ALIGNED(item_size, sizeof(u64))) {
+                pr_warn("btrfs: uuid item with illegal size %lu!\n",
+                        (unsigned long)item_size);
+                return;
+        }
+        while (item_size) {
+                __le64 subvol_id;
+
+                read_extent_buffer(l, &subvol_id, offset, sizeof(subvol_id));
+                printk(KERN_INFO "\t\tsubvol_id %llu\n",
+                       (unsigned long long)le64_to_cpu(subvol_id));
+                item_size -= sizeof(u64);
+                offset += sizeof(u64);
+        }
+}
+
 void btrfs_print_leaf(struct btrfs_root *root, struct extent_buffer *l)
 {
         int i;
@@ -301,6 +320,11 @@ void btrfs_print_leaf(struct btrfs_root *root, struct extent_buffer *l)
                 case BTRFS_DEV_REPLACE_KEY:
                         printk(KERN_INFO "\t\tdev replace\n");
                         break;
+                case BTRFS_UUID_KEY_SUBVOL:
+                case BTRFS_UUID_KEY_RECEIVED_SUBVOL:
+                        print_uuid_item(l, btrfs_item_ptr_offset(l, i),
+                                        btrfs_item_size_nr(l, i));
+                        break;
                 };
         }
 }