filemap: remove find_get_pages_contig()

All callers of find_get_pages_contig() have been removed, so it is no
longer needed.

Link: https://lkml.kernel.org/r/20220824004023.77310-8-vishal.moola@gmail.comSigned-off-by: Vishal Moola (Oracle) <vishal.moola@gmail.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Chris Mason <clm@fb.com>
Cc: David Sterba <dsterba@suse.com>
Cc: David Sterba <dsterb@suse.com>
Cc: Josef Bacik <josef@toxicpanda.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Ryusuke Konishi <konishi.ryusuke@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

include/linux/pagemap.h

@@ -720,8 +720,6 @@ unsigned filemap_get_folios(struct address_space *mapping, pgoff_t *start,
 		pgoff_t end, struct folio_batch *fbatch);
 unsigned filemap_get_folios_contig(struct address_space *mapping,
 		pgoff_t *start, pgoff_t end, struct folio_batch *fbatch);
-unsigned find_get_pages_contig(struct address_space *mapping, pgoff_t start,
-			       unsigned int nr_pages, struct page **pages);
 unsigned find_get_pages_range_tag(struct address_space *mapping, pgoff_t *index,
 			pgoff_t end, xa_mark_t tag, unsigned int nr_pages,
 			struct page **pages);

mm/filemap.c

@@ -2269,66 +2269,6 @@ unsigned filemap_get_folios_contig(struct address_space *mapping,
 }
 EXPORT_SYMBOL(filemap_get_folios_contig);
 
-/**
- * find_get_pages_contig - gang contiguous pagecache lookup
- * @mapping:	The address_space to search
- * @index:	The starting page index
- * @nr_pages:	The maximum number of pages
- * @pages:	Where the resulting pages are placed
- *
- * find_get_pages_contig() works exactly like find_get_pages_range(),
- * except that the returned number of pages are guaranteed to be
- * contiguous.
- *
- * Return: the number of pages which were found.
- */
-unsigned find_get_pages_contig(struct address_space *mapping, pgoff_t index,
-			       unsigned int nr_pages, struct page **pages)
-{
-	XA_STATE(xas, &mapping->i_pages, index);
-	struct folio *folio;
-	unsigned int ret = 0;
-
-	if (unlikely(!nr_pages))
-		return 0;
-
-	rcu_read_lock();
-	for (folio = xas_load(&xas); folio; folio = xas_next(&xas)) {
-		if (xas_retry(&xas, folio))
-			continue;
-		/*
-		 * If the entry has been swapped out, we can stop looking.
-		 * No current caller is looking for DAX entries.
-		 */
-		if (xa_is_value(folio))
-			break;
-
-		if (!folio_try_get_rcu(folio))
-			goto retry;
-
-		if (unlikely(folio != xas_reload(&xas)))
-			goto put_page;
-
-again:
-		pages[ret] = folio_file_page(folio, xas.xa_index);
-		if (++ret == nr_pages)
-			break;
-		if (folio_more_pages(folio, xas.xa_index, ULONG_MAX)) {
-			xas.xa_index++;
-			folio_ref_inc(folio);
-			goto again;
-		}
-		continue;
-put_page:
-		folio_put(folio);
-retry:
-		xas_reset(&xas);
-	}
-	rcu_read_unlock();
-	return ret;
-}
-EXPORT_SYMBOL(find_get_pages_contig);
-
 /**
  * find_get_pages_range_tag - Find and return head pages matching @tag.
  * @mapping:	the address_space to search