fs/btrfs/subpage.c

34  *   The writeback is still for the full page, but we will only submit
44  *   Even if we just want to writeback tree block A, we will also writeback
47  *   This may cause extra metadata writeback which results more COW.
446 							writeback, start, len);
461 							writeback, start, len);
466 	if (subpage_test_bitmap_all_zero(fs_info, folio, writeback)) {
553 IMPLEMENT_BTRFS_SUBPAGE_TEST_OP(writeback);
649 IMPLEMENT_BTRFS_PAGE_OPS(writeback, folio_start_writeback, folio_end_writeback,
791 	GET_SUBPAGE_BITMAP(fs_info, folio, writeback, &writeback_bitmap);
799 "start=%llu len=%u page=%llu, bitmaps uptodate=%*pbl dirty=%*pbl locked=%*pbl writeback=%*pbl ordered=%*pbl checked=%*pbl",