[PATCH v2 04/10] Btrfs: always save ref_root in delayed refs

[Jan Schmidt]

From: Arne Jansen <sensi...@gmx.net>

For consistent backref walking and (later) qgroup calculation the
information to which root a delayed ref belongs is useful even for shared
refs.

Signed-off-by: Arne Jansen <sensi...@gmx.net>
Signed-off-by: Jan Schmidt <list.bt...@jan-o-sch.net>
---
 fs/btrfs/delayed-ref.c |   18 ++++++++----------
 fs/btrfs/delayed-ref.h |   12 ++++--------
 2 files changed, 12 insertions(+), 18 deletions(-)

diff --git a/fs/btrfs/delayed-ref.c b/fs/btrfs/delayed-ref.c
index 3a0f0ab..babd37b 100644
--- a/fs/btrfs/delayed-ref.c
+++ b/fs/btrfs/delayed-ref.c
@@ -495,13 +495,12 @@ static noinline int add_delayed_tree_ref(struct 
btrfs_fs_info *fs_info,
        ref->in_tree = 1;
 
        full_ref = btrfs_delayed_node_to_tree_ref(ref);
-       if (parent) {
-               full_ref->parent = parent;
+       full_ref->parent = parent;
+       full_ref->root = ref_root;
+       if (parent)
                ref->type = BTRFS_SHARED_BLOCK_REF_KEY;
-       } else {
-               full_ref->root = ref_root;
+       else
                ref->type = BTRFS_TREE_BLOCK_REF_KEY;
-       }
        full_ref->level = level;
 
        trace_btrfs_delayed_tree_ref(ref, full_ref, action);
@@ -551,13 +550,12 @@ static noinline int add_delayed_data_ref(struct 
btrfs_fs_info *fs_info,
        ref->in_tree = 1;
 
        full_ref = btrfs_delayed_node_to_data_ref(ref);
-       if (parent) {
-               full_ref->parent = parent;
+       full_ref->parent = parent;
+       full_ref->root = ref_root;
+       if (parent)
                ref->type = BTRFS_SHARED_DATA_REF_KEY;
-       } else {
-               full_ref->root = ref_root;
+       else
                ref->type = BTRFS_EXTENT_DATA_REF_KEY;
-       }
 
        full_ref->objectid = owner;
        full_ref->offset = offset;
diff --git a/fs/btrfs/delayed-ref.h b/fs/btrfs/delayed-ref.h
index 8316bff..a5fb2bc 100644
--- a/fs/btrfs/delayed-ref.h
+++ b/fs/btrfs/delayed-ref.h
@@ -98,19 +98,15 @@ struct btrfs_delayed_ref_head {
 
 struct btrfs_delayed_tree_ref {
        struct btrfs_delayed_ref_node node;
-       union {
-               u64 root;
-               u64 parent;
-       };
+       u64 root;
+       u64 parent;
        int level;
 };
 
 struct btrfs_delayed_data_ref {
        struct btrfs_delayed_ref_node node;
-       union {
-               u64 root;
-               u64 parent;
-       };
+       u64 root;
+       u64 parent;
        u64 objectid;
        u64 offset;
 };
-- 
1.7.3.4

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