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authorQu Wenruo <wqu@suse.com>2019-05-20 13:32:21 +0800
committerQu Wenruo <wqu@suse.com>2019-05-20 13:32:21 +0800
commitb69e35deae8a8491b8e7a0c9252ae4ff557ef6f8 (patch)
tree7e99c1b14949c4ec3e1490aa5d6d1812ae977a1d
parentba7f8deee3398a233d3c1e48410e7cf13b40940f (diff)
btrfs: delayed-ref: Introduce better documented delayed ref
structures (bsc#1063638 bsc#1128052 bsc#1108838). suse-commit: 2b80f1723ef8ca827882f48763fc5f7e93e180c0
-rw-r--r--fs/btrfs/delayed-ref.h109
1 files changed, 109 insertions, 0 deletions
diff --git a/fs/btrfs/delayed-ref.h b/fs/btrfs/delayed-ref.h
index ec349bddf0ff..c8f70beada5d 100644
--- a/fs/btrfs/delayed-ref.h
+++ b/fs/btrfs/delayed-ref.h
@@ -192,6 +192,83 @@ struct btrfs_delayed_ref_root {
u64 qgroup_to_skip;
};
+enum btrfs_ref_type {
+ BTRFS_REF_NOT_SET,
+ BTRFS_REF_DATA,
+ BTRFS_REF_METADATA,
+ BTRFS_REF_LAST,
+};
+
+struct btrfs_data_ref {
+ /* For EXTENT_DATA_REF */
+
+ /* Root which refers to this data extent */
+ 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 refers to this tree block.
+ *
+ * For TREE_BLOCK_REF (skinny metadata, either inline or keyed)
+ */
+ u64 root;
+
+ /* For non-skinny metadata, no special member needed */
+};
+
+struct btrfs_ref {
+ enum btrfs_ref_type type;
+ int action;
+
+ /*
+ * Whether this extent should go through qgroup record.
+ *
+ * Normally false, but for certain cases like delayed subtree scan,
+ * setting this flag can hugely reduce qgroup overhead.
+ */
+ bool skip_qgroup;
+
+ /*
+ * Optional. For which root is this modification.
+ * Mostly used for qgroup optimization.
+ *
+ * When unset, data/tree ref init code will populate it.
+ * In certain cases, we're modifying reference for a different root.
+ * E.g. COW fs tree blocks for balance.
+ * In that case, tree_ref::root will be fs tree, but we're doing this
+ * for reloc tree, then we should set @real_root to reloc tree.
+ */
+ u64 real_root;
+ u64 bytenr;
+ u64 len;
+
+ /* Bytenr of the parent tree block */
+ u64 parent;
+ union {
+ struct btrfs_data_ref data_ref;
+ struct btrfs_tree_ref tree_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;
@@ -200,6 +277,38 @@ extern struct kmem_cache *btrfs_delayed_extent_op_cachep;
int btrfs_delayed_ref_init(void);
void btrfs_delayed_ref_exit(void);
+static inline void btrfs_init_generic_ref(struct btrfs_ref *generic_ref,
+ int action, u64 bytenr, u64 len, u64 parent)
+{
+ generic_ref->action = action;
+ generic_ref->bytenr = bytenr;
+ generic_ref->len = len;
+ generic_ref->parent = parent;
+}
+
+static inline void btrfs_init_tree_ref(struct btrfs_ref *generic_ref,
+ int level, u64 root)
+{
+ /* If @real_root not set, use @root as fallback */
+ if (!generic_ref->real_root)
+ generic_ref->real_root = root;
+ generic_ref->tree_ref.level = level;
+ generic_ref->tree_ref.root = root;
+ generic_ref->type = BTRFS_REF_METADATA;
+}
+
+static inline void btrfs_init_data_ref(struct btrfs_ref *generic_ref,
+ u64 ref_root, u64 ino, u64 offset)
+{
+ /* If @real_root not set, use @root as fallback */
+ if (!generic_ref->real_root)
+ generic_ref->real_root = ref_root;
+ generic_ref->data_ref.ref_root = ref_root;
+ generic_ref->data_ref.ino = ino;
+ generic_ref->data_ref.offset = offset;
+ generic_ref->type = BTRFS_REF_DATA;
+}
+
static inline struct btrfs_delayed_extent_op *
btrfs_alloc_delayed_extent_op(void)
{