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>

diff --git a/fs/btrfs/print-tree.c b/fs/btrfs/print-tree.c
index fe7bf4a12568df191bf913542b4acd04672fadac..32022f3f169b8968a17f16158f9f61043bdf595c 100644 (file)
--- 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;
                };
        }
 }