linux-master/mm/page-writeback.c

2364 		struct writeback_control *wbc, struct folio *folio)
2383 		if (wbc->sync_mode == WB_SYNC_NONE)
2395 static xa_mark_t wbc_to_tag(struct writeback_control *wbc)
2397 	if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages)
2402 static pgoff_t wbc_end(struct writeback_control *wbc)
2404 	if (wbc->range_cyclic)
2406 	return wbc->range_end >> PAGE_SHIFT;
2410 		struct writeback_control *wbc)
2415 	folio = folio_batch_next(&wbc->fbatch);
2417 		folio_batch_release(&wbc->fbatch);
2419 		filemap_get_folios_tag(mapping, &wbc->index, wbc_end(wbc),
2420 				wbc_to_tag(wbc), &wbc->fbatch);
2421 		folio = folio_batch_next(&wbc->fbatch);
2427 	if (unlikely(!folio_prepare_writeback(mapping, wbc, folio))) {
2432 	trace_wbc_writepage(wbc, inode_to_bdi(mapping->host));
2439  * @wbc: writeback context
2444  * @wbc on @mapping and  should be called in a while loop in the ->writepages
2454  * Once the writeback described in @wbc has finished, this function will return
2463 		struct writeback_control *wbc, struct folio *folio, int *error)
2466 		folio_batch_init(&wbc->fbatch);
2467 		wbc->saved_err = *error = 0;
2476 		if (wbc->range_cyclic)
2477 			wbc->index = mapping->writeback_index;
2479 			wbc->index = wbc->range_start >> PAGE_SHIFT;
2492 		if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages)
2493 			tag_pages_for_writeback(mapping, wbc->index,
2494 					wbc_end(wbc));
2496 		wbc->nr_to_write -= folio_nr_pages(folio);
2503 		 * we run past wbc->nr_to_write or encounter errors.
2504 		 * We stash away the first error we encounter in wbc->saved_err
2509 		 * wbc->nr_to_write or encounter the first error.
2511 		if (wbc->sync_mode == WB_SYNC_ALL) {
2512 			if (*error && !wbc->saved_err)
2513 				wbc->saved_err = *error;
2515 			if (*error || wbc->nr_to_write <= 0)
2520 	folio = writeback_get_folio(mapping, wbc);
2532 		if (wbc->range_cyclic)
2539 		*error = wbc->saved_err;
2544 	if (wbc->range_cyclic)
2546 	folio_batch_release(&wbc->fbatch);
2553  * @wbc: subtract the number of written pages from *@wbc->nr_to_write
2562 		      struct writeback_control *wbc, writepage_t writepage,
2568 	while ((folio = writeback_iter(mapping, wbc, folio, &error))) {
2569 		error = writepage(folio, wbc, data);
2581 		struct writeback_control *wbc)
2588 	while ((folio = writeback_iter(mapping, wbc, folio, &err))) {
2589 		err = mapping->a_ops->writepage(&folio->page, wbc);
2601 int do_writepages(struct address_space *mapping, struct writeback_control *wbc)
2606 	if (wbc->nr_to_write <= 0)
2608 	wb = inode_to_wb_wbc(mapping->host, wbc);
2612 			ret = mapping->a_ops->writepages(mapping, wbc);
2614 			ret = writeback_use_writepage(mapping, wbc);
2619 		if (ret != -ENOMEM || wbc->sync_mode != WB_SYNC_ALL)
2770  * @wbc: The writeback control.
2780 bool folio_redirty_for_writepage(struct writeback_control *wbc,
2787 	wbc->pages_skipped += nr;