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-rw-r--r--fs/btrfs/delayed-ref.h148
1 files changed, 80 insertions, 68 deletions
diff --git a/fs/btrfs/delayed-ref.h b/fs/btrfs/delayed-ref.h
index b291147cb8..04b180ebe1 100644
--- a/fs/btrfs/delayed-ref.h
+++ b/fs/btrfs/delayed-ref.h
@@ -30,6 +30,32 @@ enum btrfs_delayed_ref_action {
BTRFS_UPDATE_DELAYED_HEAD,
} __packed;
+struct btrfs_data_ref {
+ /* For EXTENT_DATA_REF */
+
+ /* Inode which refers to this data extent */
+ u64 objectid;
+
+ /*
+ * file_offset - extent_offset
+ *
+ * file_offset is the key.offset of the EXTENT_DATA key.
+ * extent_offset is btrfs_file_extent_offset() of the EXTENT_DATA data.
+ */
+ u64 offset;
+};
+
+struct btrfs_tree_ref {
+ /*
+ * Level of this tree block.
+ *
+ * Shared for skinny (TREE_BLOCK_REF) and normal tree ref.
+ */
+ int level;
+
+ /* For non-skinny metadata, no special member needed */
+};
+
struct btrfs_delayed_ref_node {
struct rb_node ref_node;
/*
@@ -48,6 +74,15 @@ struct btrfs_delayed_ref_node {
/* seq number to keep track of insertion order */
u64 seq;
+ /* The ref_root for this ref */
+ u64 ref_root;
+
+ /*
+ * The parent for this ref, if this isn't set the ref_root is the
+ * reference owner.
+ */
+ u64 parent;
+
/* ref count on this data structure */
refcount_t refs;
@@ -64,6 +99,11 @@ struct btrfs_delayed_ref_node {
unsigned int action:8;
unsigned int type:8;
+
+ union {
+ struct btrfs_tree_ref tree_ref;
+ struct btrfs_data_ref data_ref;
+ };
};
struct btrfs_delayed_extent_op {
@@ -151,21 +191,6 @@ struct btrfs_delayed_ref_head {
bool processing;
};
-struct btrfs_delayed_tree_ref {
- struct btrfs_delayed_ref_node node;
- u64 root;
- u64 parent;
- int level;
-};
-
-struct btrfs_delayed_data_ref {
- struct btrfs_delayed_ref_node node;
- u64 root;
- u64 parent;
- u64 objectid;
- u64 offset;
-};
-
enum btrfs_delayed_ref_flags {
/* Indicate that we are flushing delayed refs for the commit */
BTRFS_DELAYED_REFS_FLUSHING,
@@ -214,42 +239,6 @@ enum btrfs_ref_type {
BTRFS_REF_LAST,
} __packed;
-struct btrfs_data_ref {
- /* For EXTENT_DATA_REF */
-
- /* Root which owns this data reference. */
- u64 ref_root;
-
- /* Inode which refers to this data extent */
- u64 ino;
-
- /*
- * file_offset - extent_offset
- *
- * file_offset is the key.offset of the EXTENT_DATA key.
- * extent_offset is btrfs_file_extent_offset() of the EXTENT_DATA data.
- */
- u64 offset;
-};
-
-struct btrfs_tree_ref {
- /*
- * Level of this tree block
- *
- * Shared for skinny (TREE_BLOCK_REF) and normal tree ref.
- */
- int level;
-
- /*
- * Root which owns this tree block reference.
- *
- * For TREE_BLOCK_REF (skinny metadata, either inline or keyed)
- */
- u64 ref_root;
-
- /* For non-skinny metadata, no special member needed */
-};
-
struct btrfs_ref {
enum btrfs_ref_type type;
enum btrfs_delayed_ref_action action;
@@ -267,9 +256,15 @@ struct btrfs_ref {
u64 real_root;
#endif
u64 bytenr;
- u64 len;
+ u64 num_bytes;
u64 owning_root;
+ /*
+ * The root that owns the reference for this reference, this will be set
+ * or ->parent will be set, depending on what type of reference this is.
+ */
+ u64 ref_root;
+
/* Bytenr of the parent tree block */
u64 parent;
union {
@@ -279,8 +274,7 @@ struct btrfs_ref {
};
extern struct kmem_cache *btrfs_delayed_ref_head_cachep;
-extern struct kmem_cache *btrfs_delayed_tree_ref_cachep;
-extern struct kmem_cache *btrfs_delayed_data_ref_cachep;
+extern struct kmem_cache *btrfs_delayed_ref_node_cachep;
extern struct kmem_cache *btrfs_delayed_extent_op_cachep;
int __init btrfs_delayed_ref_init(void);
@@ -318,12 +312,10 @@ static inline u64 btrfs_calc_delayed_ref_csum_bytes(const struct btrfs_fs_info *
return btrfs_calc_metadata_size(fs_info, num_csum_items);
}
-void btrfs_init_generic_ref(struct btrfs_ref *generic_ref, int action, u64 bytenr,
- u64 len, u64 parent, u64 owning_root);
-void btrfs_init_tree_ref(struct btrfs_ref *generic_ref, int level, u64 root,
+void btrfs_init_tree_ref(struct btrfs_ref *generic_ref, int level, u64 mod_root,
+ bool skip_qgroup);
+void btrfs_init_data_ref(struct btrfs_ref *generic_ref, u64 ino, u64 offset,
u64 mod_root, bool skip_qgroup);
-void btrfs_init_data_ref(struct btrfs_ref *generic_ref, u64 ref_root, u64 ino,
- u64 offset, u64 mod_root, bool skip_qgroup);
static inline struct btrfs_delayed_extent_op *
btrfs_alloc_delayed_extent_op(void)
@@ -398,19 +390,39 @@ void btrfs_migrate_to_delayed_refs_rsv(struct btrfs_fs_info *fs_info,
u64 num_bytes);
bool btrfs_check_space_for_delayed_refs(struct btrfs_fs_info *fs_info);
-/*
- * helper functions to cast a node into its container
- */
-static inline struct btrfs_delayed_tree_ref *
-btrfs_delayed_node_to_tree_ref(struct btrfs_delayed_ref_node *node)
+static inline u64 btrfs_delayed_ref_owner(struct btrfs_delayed_ref_node *node)
+{
+ if (node->type == BTRFS_EXTENT_DATA_REF_KEY ||
+ node->type == BTRFS_SHARED_DATA_REF_KEY)
+ return node->data_ref.objectid;
+ return node->tree_ref.level;
+}
+
+static inline u64 btrfs_delayed_ref_offset(struct btrfs_delayed_ref_node *node)
{
- return container_of(node, struct btrfs_delayed_tree_ref, node);
+ if (node->type == BTRFS_EXTENT_DATA_REF_KEY ||
+ node->type == BTRFS_SHARED_DATA_REF_KEY)
+ return node->data_ref.offset;
+ return 0;
}
-static inline struct btrfs_delayed_data_ref *
-btrfs_delayed_node_to_data_ref(struct btrfs_delayed_ref_node *node)
+static inline u8 btrfs_ref_type(struct btrfs_ref *ref)
{
- return container_of(node, struct btrfs_delayed_data_ref, node);
+ ASSERT(ref->type == BTRFS_REF_DATA || ref->type == BTRFS_REF_METADATA);
+
+ if (ref->type == BTRFS_REF_DATA) {
+ if (ref->parent)
+ return BTRFS_SHARED_DATA_REF_KEY;
+ else
+ return BTRFS_EXTENT_DATA_REF_KEY;
+ } else {
+ if (ref->parent)
+ return BTRFS_SHARED_BLOCK_REF_KEY;
+ else
+ return BTRFS_TREE_BLOCK_REF_KEY;
+ }
+
+ return 0;
}
#endif