page-writeback: convert write_cache_pages() to use filemap_get_folios_tag()

Convert function to use folios throughout.  This is in preparation for the
removal of find_get_pages_range_tag().  This change removes 8 calls to
compound_head(), and the function now supports large folios.

Link: https://lkml.kernel.org/r/20230104211448.4804-5-vishal.moola@gmail.com
Signed-off-by: Vishal Moola (Oracle) <vishal.moola@gmail.com>
Reviewed-by: Matthew Wilcow (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index e91f94b..5e892f2 100644 (file)
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -2398,15 +2398,15 @@ int write_cache_pages(struct address_space *mapping,
        int ret = 0;
        int done = 0;
        int error;
-       struct pagevec pvec;
-       int nr_pages;
+       struct folio_batch fbatch;
+       int nr_folios;
        pgoff_t index;
        pgoff_t end;            /* Inclusive */
        pgoff_t done_index;
        int range_whole = 0;
        xa_mark_t tag;
 
-       pagevec_init(&pvec);
+       folio_batch_init(&fbatch);
        if (wbc->range_cyclic) {
                index = mapping->writeback_index; /* prev offset */
                end = -1;
@@ -2426,17 +2426,18 @@ int write_cache_pages(struct address_space *mapping,
        while (!done && (index <= end)) {
                int i;
 
-               nr_pages = pagevec_lookup_range_tag(&pvec, mapping, &index, end,
-                               tag);
-               if (nr_pages == 0)
+               nr_folios = filemap_get_folios_tag(mapping, &index, end,
+                               tag, &fbatch);
+
+               if (nr_folios == 0)
                        break;
 
-               for (i = 0; i < nr_pages; i++) {
-                       struct page *page = pvec.pages[i];
+               for (i = 0; i < nr_folios; i++) {
+                       struct folio *folio = fbatch.folios[i];
 
-                       done_index = page->index;
+                       done_index = folio->index;
 
-                       lock_page(page);
+                       folio_lock(folio);
 
                        /*
                         * Page truncated or invalidated. We can freely skip it
@@ -2446,30 +2447,30 @@ int write_cache_pages(struct address_space *mapping,
                         * even if there is now a new, dirty page at the same
                         * pagecache address.
                         */
-                       if (unlikely(page->mapping != mapping)) {
+                       if (unlikely(folio->mapping != mapping)) {
 continue_unlock:
-                               unlock_page(page);
+                               folio_unlock(folio);
                                continue;
                        }
 
-                       if (!PageDirty(page)) {
+                       if (!folio_test_dirty(folio)) {
                                /* someone wrote it for us */
                                goto continue_unlock;
                        }
 
-                       if (PageWriteback(page)) {
+                       if (folio_test_writeback(folio)) {
                                if (wbc->sync_mode != WB_SYNC_NONE)
-                                       wait_on_page_writeback(page);
+                                       folio_wait_writeback(folio);
                                else
                                        goto continue_unlock;
                        }
 
-                       BUG_ON(PageWriteback(page));
-                       if (!clear_page_dirty_for_io(page))
+                       BUG_ON(folio_test_writeback(folio));
+                       if (!folio_clear_dirty_for_io(folio))
                                goto continue_unlock;
 
                        trace_wbc_writepage(wbc, inode_to_bdi(mapping->host));
-                       error = (*writepage)(page, wbc, data);
+                       error = writepage(&folio->page, wbc, data);
                        if (unlikely(error)) {
                                /*
                                 * Handle errors according to the type of
@@ -2484,11 +2485,12 @@ continue_unlock:
                                 * the first error.
                                 */
                                if (error == AOP_WRITEPAGE_ACTIVATE) {
-                                       unlock_page(page);
+                                       folio_unlock(folio);
                                        error = 0;
                                } else if (wbc->sync_mode != WB_SYNC_ALL) {
                                        ret = error;
-                                       done_index = page->index + 1;
+                                       done_index = folio->index +
+                                               folio_nr_pages(folio);
                                        done = 1;
                                        break;
                                }
@@ -2508,7 +2510,7 @@ continue_unlock:
                                break;
                        }
                }
-               pagevec_release(&pvec);
+               folio_batch_release(&fbatch);
                cond_resched();
        }