btrfs: Document __btrfs_inc_extent_ref

Here is a doc-only patch which tires to deobfuscate the terra-incognita
that arguments for delayed refs are.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 3d9fe58c0080db89f4933f162f8bf7f8d6df1c85..2c55f3dce27b0211ba272c9ef8adb450c18113db 100644 (file)
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -2207,6 +2207,40 @@ int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
        return ret;
 }
 
+/*
+ * __btrfs_inc_extent_ref - insert backreference for a given extent
+ *
+ * @trans:         Handle of transaction
+ *
+ * @node:          The delayed ref node used to get the bytenr/length for
+ *                 extent whose references are incremented.
+ *
+ * @parent:        If this is a shared extent (BTRFS_SHARED_DATA_REF_KEY/
+ *                 BTRFS_SHARED_BLOCK_REF_KEY) then it holds the logical
+ *                 bytenr of the parent block. Since new extents are always
+ *                 created with indirect references, this will only be the case
+ *                 when relocating a shared extent. In that case, root_objectid
+ *                 will be BTRFS_TREE_RELOC_OBJECTID. Otheriwse, parent must
+ *                 be 0
+ *
+ * @root_objectid:  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.
+ *
+ * @owner:         For data extents it is the inode number of the owning file.
+ *                 For metadata extents this parameter holds the level in the
+ *                 tree of the extent.
+ *
+ * @offset:        For metadata extents the offset is ignored and is currently
+ *                 always passed as 0. For data extents it is the fileoffset
+ *                 this extent belongs to.
+ *
+ * @refs_to_add     Number of references to add
+ *
+ * @extent_op       Pointer to a structure, holding information necessary when
+ *                  updating a tree block's flags
+ *
+ */
 static int __btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
                                  struct btrfs_fs_info *fs_info,
                                  struct btrfs_delayed_ref_node *node,