Btrfs: mark delayed refs as for cow

Add a for_cow parameter to add_delayed_*_ref and pass the appropriate value
from every call site. The for_cow parameter will later on be used to
determine if a ref will change anything with respect to qgroups.

Delayed refs coming from relocation are always counted as for_cow, as they
don't change subvol quota.

Also pass in the fs_info for later use.

btrfs_find_all_roots() will use this as an optimization, as changes that are
for_cow will not change anything with respect to which root points to a
certain leaf. Thus, we don't need to add the current sequence number to
those delayed refs.

Signed-off-by: Arne Jansen <sensille@gmx.net>
Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>

1 files changed, 10 insertions, 5 deletions

diff --git a/fs/btrfs/delayed-ref.h b/fs/btrfs/delayed-ref.h
index e287e3b0eab0..8316bff18d30 100644
--- a/fs/btrfs/delayed-ref.h
+++ b/fs/btrfs/delayed-ref.h
@@ -151,16 +151,21 @@ static inline void btrfs_put_delayed_ref(struct btrfs_delayed_ref_node *ref)
         }
 }
 
-int btrfs_add_delayed_tree_ref(struct btrfs_trans_handle *trans,
+int btrfs_add_delayed_tree_ref(struct btrfs_fs_info *fs_info,
+                               struct btrfs_trans_handle *trans,
                                u64 bytenr, u64 num_bytes, u64 parent,
                                u64 ref_root, int level, int action,
-                               struct btrfs_delayed_extent_op *extent_op);
-int btrfs_add_delayed_data_ref(struct btrfs_trans_handle *trans,
+                               struct btrfs_delayed_extent_op *extent_op,
+                               int for_cow);
+int btrfs_add_delayed_data_ref(struct btrfs_fs_info *fs_info,
+                               struct btrfs_trans_handle *trans,
                                u64 bytenr, u64 num_bytes,
                                u64 parent, u64 ref_root,
                                u64 owner, u64 offset, int action,
-                               struct btrfs_delayed_extent_op *extent_op);
-int btrfs_add_delayed_extent_op(struct btrfs_trans_handle *trans,
+                               struct btrfs_delayed_extent_op *extent_op,
+                               int for_cow);
+int btrfs_add_delayed_extent_op(struct btrfs_fs_info *fs_info,
+                                struct btrfs_trans_handle *trans,
                                 u64 bytenr, u64 num_bytes,
                                 struct btrfs_delayed_extent_op *extent_op);