Btrfs: snapshot progress

Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 15 insertions, 1 deletions

diff --git a/fs/btrfs/root-tree.c b/fs/btrfs/root-tree.c
index ddc1c13a5352..72be9836932f 100644
--- a/fs/btrfs/root-tree.c
+++ b/fs/btrfs/root-tree.c
@@ -83,6 +83,8 @@ int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
 {
         struct btrfs_path *path;
         int ret;
+        u32 refs;
+        struct btrfs_root_item *ri;
 
         path = btrfs_alloc_path();
         BUG_ON(!path);
@@ -91,7 +93,19 @@ int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
         if (ret < 0)
                 goto out;
         BUG_ON(ret != 0);
-        ret = btrfs_del_item(trans, root, path);
+        ri = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
+                            path->slots[0], struct btrfs_root_item);
+
+        refs = btrfs_root_refs(ri);
+        BUG_ON(refs == 0);
+        if (refs == 1) {
+                ret = btrfs_del_item(trans, root, path);
+printk("deleting root %Lu %Lu %u\n", key->objectid, key->offset, key->flags);
+        } else {
+                btrfs_set_root_refs(ri, refs - 1);
+printk("ref now %u root %Lu %Lu %u\n", refs -1, key->objectid, key->offset, key->flags);
+                mark_buffer_dirty(path->nodes[0]);
+        }
 out:
         btrfs_release_path(root, path);
         btrfs_free_path(path);