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-rw-r--r--mm/swap.c24
1 files changed, 15 insertions, 9 deletions
diff --git a/mm/swap.c b/mm/swap.c
index 60b1d2a75852..62d96b8e5eb3 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -946,28 +946,34 @@ void pagevec_remove_exceptionals(struct pagevec *pvec)
}
/**
- * pagevec_lookup - gang pagecache lookup
+ * pagevec_lookup_range - gang pagecache lookup
* @pvec: Where the resulting pages are placed
* @mapping: The address_space to search
* @start: The starting page index
+ * @end: The final page index
* @nr_pages: The maximum number of pages
*
- * pagevec_lookup() will search for and return a group of up to @nr_pages pages
- * in the mapping. The pages are placed in @pvec. pagevec_lookup() takes a
+ * pagevec_lookup_range() will search for and return a group of up to @nr_pages
+ * pages in the mapping starting from index @start and upto index @end
+ * (inclusive). The pages are placed in @pvec. pagevec_lookup() takes a
* reference against the pages in @pvec.
*
* The search returns a group of mapping-contiguous pages with ascending
- * indexes. There may be holes in the indices due to not-present pages.
+ * indexes. There may be holes in the indices due to not-present pages. We
+ * also update @start to index the next page for the traversal.
*
- * pagevec_lookup() returns the number of pages which were found.
+ * pagevec_lookup_range() returns the number of pages which were found. If this
+ * number is smaller than @nr_pages, the end of specified range has been
+ * reached.
*/
-unsigned pagevec_lookup(struct pagevec *pvec, struct address_space *mapping,
- pgoff_t start, unsigned nr_pages)
+unsigned pagevec_lookup_range(struct pagevec *pvec,
+ struct address_space *mapping, pgoff_t *start, pgoff_t end)
{
- pvec->nr = find_get_pages(mapping, start, nr_pages, pvec->pages);
+ pvec->nr = find_get_pages_range(mapping, start, end, PAGEVEC_SIZE,
+ pvec->pages);
return pagevec_count(pvec);
}
-EXPORT_SYMBOL(pagevec_lookup);
+EXPORT_SYMBOL(pagevec_lookup_range);
unsigned pagevec_lookup_tag(struct pagevec *pvec, struct address_space *mapping,
pgoff_t *index, int tag, unsigned nr_pages)