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-rw-r--r--fs/btrfs/delayed-ref.h29
1 files changed, 28 insertions, 1 deletions
diff --git a/fs/btrfs/delayed-ref.h b/fs/btrfs/delayed-ref.h
index 5eb0892396d0..13fb5e6090fe 100644
--- a/fs/btrfs/delayed-ref.h
+++ b/fs/btrfs/delayed-ref.h
@@ -24,9 +24,25 @@
#define BTRFS_ADD_DELAYED_EXTENT 3 /* record a full extent allocation */
#define BTRFS_UPDATE_DELAYED_HEAD 4 /* not changing ref count on head ref */
+/*
+ * XXX: Qu: I really hate the design that ref_head and tree/data ref shares the
+ * same ref_node structure.
+ * Ref_head is in a higher logic level than tree/data ref, and duplicated
+ * bytenr/num_bytes in ref_node is really a waste or memory, they should be
+ * referred from ref_head.
+ * This gets more disgusting after we use list to store tree/data ref in
+ * ref_head. Must clean this mess up later.
+ */
struct btrfs_delayed_ref_node {
+ /*
+ * ref_head use rb tree, stored in ref_root->href.
+ * indexed by bytenr
+ */
struct rb_node rb_node;
+ /*data/tree ref use list, stored in ref_head->ref_list. */
+ struct list_head list;
+
/* the starting bytenr of the extent */
u64 bytenr;
@@ -83,7 +99,7 @@ struct btrfs_delayed_ref_head {
struct mutex mutex;
spinlock_t lock;
- struct rb_root ref_root;
+ struct list_head ref_list;
struct rb_node href_node;
@@ -132,6 +148,9 @@ struct btrfs_delayed_ref_root {
/* head ref rbtree */
struct rb_root href_root;
+ /* dirty extent records */
+ struct rb_root dirty_extent_root;
+
/* this spin lock protects the rbtree and the entries inside */
spinlock_t lock;
@@ -156,6 +175,14 @@ struct btrfs_delayed_ref_root {
int flushing;
u64 run_delayed_start;
+
+ /*
+ * To make qgroup to skip given root.
+ * This is for snapshot, as btrfs_qgroup_inherit() will manully
+ * modify counters for snapshot and its source, so we should skip
+ * the snapshot in new_root/old_roots or it will get calculated twice
+ */
+ u64 qgroup_to_skip;
};
extern struct kmem_cache *btrfs_delayed_ref_head_cachep;