[PATCH v2 23/23] filemap: Remove find_get_pages_range_tag()

["Vishal Moola (Oracle)" <vishal.moola@gmail.com>]

All callers to find_get_pages_range_tag(), find_get_pages_tag(),
pagevec_lookup_range_tag(), and pagevec_lookup_tag() have been removed.

Signed-off-by: Vishal Moola (Oracle) <vishal.moola@gmail.com>
---
 include/linux/pagemap.h | 10 -------
 include/linux/pagevec.h |  8 ------
 mm/filemap.c            | 60 -----------------------------------------
 mm/swap.c               | 10 -------
 4 files changed, 88 deletions(-)

diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 85cc96c82c2c..b8ea33751a66 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -742,16 +742,6 @@ unsigned find_get_pages_contig(struct address_space *mapping, pgoff_t start,
 			       unsigned int nr_pages, struct page **pages);
 unsigned filemap_get_folios_tag(struct address_space *mapping, pgoff_t *start,
 		pgoff_t end, xa_mark_t tag, struct folio_batch *fbatch);
-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);
-static inline unsigned find_get_pages_tag(struct address_space *mapping,
-			pgoff_t *index, xa_mark_t tag, unsigned int nr_pages,
-			struct page **pages)
-{
-	return find_get_pages_range_tag(mapping, index, (pgoff_t)-1, tag,
-					nr_pages, pages);
-}
 
 struct page *grab_cache_page_write_begin(struct address_space *mapping,
 			pgoff_t index);
diff --git a/include/linux/pagevec.h b/include/linux/pagevec.h
index 215eb6c3bdc9..a520632297ac 100644
--- a/include/linux/pagevec.h
+++ b/include/linux/pagevec.h
@@ -26,14 +26,6 @@ struct pagevec {
 };
 
 void __pagevec_release(struct pagevec *pvec);
-unsigned pagevec_lookup_range_tag(struct pagevec *pvec,
-		struct address_space *mapping, pgoff_t *index, pgoff_t end,
-		xa_mark_t tag);
-static inline unsigned pagevec_lookup_tag(struct pagevec *pvec,
-		struct address_space *mapping, pgoff_t *index, xa_mark_t tag)
-{
-	return pagevec_lookup_range_tag(pvec, mapping, index, (pgoff_t)-1, tag);
-}
 
 static inline void pagevec_init(struct pagevec *pvec)
 {
diff --git a/mm/filemap.c b/mm/filemap.c
index 435fc53b3f2f..b986f246a6ae 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -2309,66 +2309,6 @@ unsigned filemap_get_folios_tag(struct address_space *mapping, pgoff_t *start,
 }
 EXPORT_SYMBOL(filemap_get_folios_tag);
 
-/**
- * find_get_pages_range_tag - Find and return head pages matching @tag.
- * @mapping:	the address_space to search
- * @index:	the starting page index
- * @end:	The final page index (inclusive)
- * @tag:	the tag index
- * @nr_pages:	the maximum number of pages
- * @pages:	where the resulting pages are placed
- *
- * Like find_get_pages_range(), except we only return head pages which are
- * tagged with @tag.  @index is updated to the index immediately after the
- * last page we return, ready for the next iteration.
- *
- * Return: the number of pages which were found.
- */
-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)
-{
-	XA_STATE(xas, &mapping->i_pages, *index);
-	struct folio *folio;
-	unsigned ret = 0;
-
-	if (unlikely(!nr_pages))
-		return 0;
-
-	rcu_read_lock();
-	while ((folio = find_get_entry(&xas, end, tag))) {
-		/*
-		 * Shadow entries should never be tagged, but this iteration
-		 * is lockless so there is a window for page reclaim to evict
-		 * a page we saw tagged.  Skip over it.
-		 */
-		if (xa_is_value(folio))
-			continue;
-
-		pages[ret] = &folio->page;
-		if (++ret == nr_pages) {
-			*index = folio->index + folio_nr_pages(folio);
-			goto out;
-		}
-	}
-
-	/*
-	 * We come here when we got to @end. We take care to not overflow the
-	 * index @index as it confuses some of the callers. This breaks the
-	 * iteration when there is a page at index -1 but that is already
-	 * broken anyway.
-	 */
-	if (end == (pgoff_t)-1)
-		*index = (pgoff_t)-1;
-	else
-		*index = end + 1;
-out:
-	rcu_read_unlock();
-
-	return ret;
-}
-EXPORT_SYMBOL(find_get_pages_range_tag);
-
 /*
  * CD/DVDs are error prone. When a medium error occurs, the driver may fail
  * a _large_ part of the i/o request. Imagine the worst scenario:
diff --git a/mm/swap.c b/mm/swap.c
index 9cee7f6a3809..7b8c1c8024a1 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -1055,16 +1055,6 @@ void folio_batch_remove_exceptionals(struct folio_batch *fbatch)
 	fbatch->nr = j;
 }
 
-unsigned pagevec_lookup_range_tag(struct pagevec *pvec,
-		struct address_space *mapping, pgoff_t *index, pgoff_t end,
-		xa_mark_t tag)
-{
-	pvec->nr = find_get_pages_range_tag(mapping, index, end, tag,
-					PAGEVEC_SIZE, pvec->pages);
-	return pagevec_count(pvec);
-}
-EXPORT_SYMBOL(pagevec_lookup_range_tag);
-
 /*
  * Perform any setup for the swap system
  */
-- 
2.36.1