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authorQu Wenruo <wqu@suse.com>2019-05-17 17:16:17 +0800
committerQu Wenruo <wqu@suse.com>2019-05-17 17:16:17 +0800
commitf773f1ffb560850b0ff1d69b23cd8fbe7245392c (patch)
tree5d20a160b363bf94c0be98dcecbf14380f6e1578
parent11de0ba66aa30c6ebdc619ea19012734896c965f (diff)
btrfs: Factor out common delayed refs init code (bsc#1134813).
-rw-r--r--fs/btrfs/delayed-ref.c51
1 files changed, 51 insertions, 0 deletions
diff --git a/fs/btrfs/delayed-ref.c b/fs/btrfs/delayed-ref.c
index 11d1a79929f5..698dd418e3cc 100644
--- a/fs/btrfs/delayed-ref.c
+++ b/fs/btrfs/delayed-ref.c
@@ -670,6 +670,57 @@ add_delayed_ref_head(struct btrfs_fs_info *fs_info,
}
/*
+ * init_delayed_ref_common - Initialize the structure which represents a
+ * modification to a an extent.
+ *
+ * @fs_info: Internal to the mounted filesystem mount structure.
+ *
+ * @ref: The structure which is going to be initialized.
+ *
+ * @bytenr: The logical address of the extent for which a modification is
+ * going to be recorded.
+ *
+ * @num_bytes: Size of the extent whose modification is being recorded.
+ *
+ * @ref_root: The id of the root where this modification has originated, this
+ * can be either one of the well-known metadata trees or the
+ * subvolume id which references this extent.
+ *
+ * @action: Can be one of BTRFS_ADD_DELAYED_REF/BTRFS_DROP_DELAYED_REF or
+ * BTRFS_ADD_DELAYED_EXTENT
+ *
+ * @ref_type: Holds the type of the extent which is being recorded, can be
+ * one of BTRFS_SHARED_BLOCK_REF_KEY/BTRFS_TREE_BLOCK_REF_KEY
+ * when recording a metadata extent or BTRFS_SHARED_DATA_REF_KEY/
+ * BTRFS_EXTENT_DATA_REF_KEY when recording data extent
+ */
+static void init_delayed_ref_common(struct btrfs_fs_info *fs_info,
+ struct btrfs_delayed_ref_node *ref,
+ u64 bytenr, u64 num_bytes, u64 ref_root,
+ int action, u8 ref_type)
+{
+ u64 seq = 0;
+
+ if (action == BTRFS_ADD_DELAYED_EXTENT)
+ action = BTRFS_ADD_DELAYED_REF;
+
+ if (is_fstree(ref_root))
+ seq = atomic64_read(&fs_info->tree_mod_seq);
+
+ atomic_set(&ref->refs, 1);
+ ref->bytenr = bytenr;
+ ref->num_bytes = num_bytes;
+ ref->ref_mod = 1;
+ ref->action = action;
+ ref->is_head = 0;
+ ref->in_tree = 1;
+ ref->seq = seq;
+ ref->type = ref_type;
+ RB_CLEAR_NODE(&ref->ref_node);
+ INIT_LIST_HEAD(&ref->add_list);
+}
+
+/*
* helper to insert a delayed tree ref into the rbtree.
*/
static noinline void