76 	 * and doesn't need to be locked.  in btrfs_attach_subpage()
234 	const int start_bit = subpage_calc_start_bit(fs_info, folio, locked, start, len);  in btrfs_subpage_end_and_test_lock()
248 	 * This @locked_page is locked by plain lock_page(), thus its  in btrfs_subpage_end_and_test_lock()
249 	 * subpage::locked is 0.  Handle them in a special way.  in btrfs_subpage_end_and_test_lock()
267  * Handle different locked folios:
272  * - folio locked but without any subpage locked
277  * - folio locked with subpage range locked.
278  *   We go through the locked sectors inside the range and clear their locked
280  *   the last locked range.
295 	 * For subpage case, there are two types of locked page.  With or  in btrfs_folio_end_lock()
296 	 * without locked number.  in btrfs_folio_end_lock()
298 	 * Since we own the page lock, no one else could touch subpage::locked  in btrfs_folio_end_lock()
302 		/* No subpage lock, locked by plain lock_page(). */  in btrfs_folio_end_lock()
329 		/* No subpage lock, locked by plain lock_page(). */  in btrfs_folio_end_lock_bitmap()
722  * This is for folio already locked by plain lock_page()/folio_lock(), which
742 	start_bit = subpage_calc_start_bit(fs_info, folio, locked, start, len);  in btrfs_folio_set_lock()
745 	/* Target range should not yet be locked. */  in btrfs_folio_set_lock()
747 		SUBPAGE_DUMP_BITMAP(fs_info, folio, locked, start, len);  in btrfs_folio_set_lock()
801 	GET_SUBPAGE_BITMAP(fs_info, folio, locked, &locked_bitmap);  in btrfs_subpage_dump_bitmap()
806 "start=%llu len=%u page=%llu, bitmaps uptodate=%*pbl dirty=%*pbl locked=%*pbl writeback=%*pbl order…  in btrfs_subpage_dump_bitmap()