[PATCH 12/15] mm: Add variant of pagevec_lookup_range_tag() taking number of pages

[Jan Kara <jack@suse.cz>]

Currently pagevec_lookup_range_tag() takes number of pages to look up
but most users don't need this. Create a new function
pagevec_lookup_range_nr_tag() that takes maximum number of pages to
lookup for Ceph which wants this functionality so that we can drop
nr_pages argument from pagevec_lookup_range_tag().

Signed-off-by: Jan Kara <jack@suse.cz>
---
 include/linux/pagevec.h | 3 +++
 mm/swap.c               | 9 +++++++++
 2 files changed, 12 insertions(+)

diff --git a/include/linux/pagevec.h b/include/linux/pagevec.h
index 371edacc10d5..0281b1d3a91b 100644
--- a/include/linux/pagevec.h
+++ b/include/linux/pagevec.h
@@ -40,6 +40,9 @@ static inline unsigned pagevec_lookup(struct pagevec *pvec,
 unsigned pagevec_lookup_range_tag(struct pagevec *pvec,
 		struct address_space *mapping, pgoff_t *index, pgoff_t end,
 		int tag, unsigned nr_pages);
+unsigned pagevec_lookup_range_nr_tag(struct pagevec *pvec,
+		struct address_space *mapping, pgoff_t *index, pgoff_t end,
+		int tag, unsigned max_pages);
 static inline unsigned pagevec_lookup_tag(struct pagevec *pvec,
 		struct address_space *mapping, pgoff_t *index, int tag,
 		unsigned nr_pages)
diff --git a/mm/swap.c b/mm/swap.c
index a00065f2a8f2..97186da8e5bd 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -996,6 +996,15 @@ unsigned pagevec_lookup_range_tag(struct pagevec *pvec,
 }
 EXPORT_SYMBOL(pagevec_lookup_range_tag);
 
+unsigned pagevec_lookup_range_nr_tag(struct pagevec *pvec,
+		struct address_space *mapping, pgoff_t *index, pgoff_t end,
+		int tag, unsigned max_pages)
+{
+	pvec->nr = find_get_pages_range_tag(mapping, index, end, tag,
+		min_t(unsigned int, max_pages, PAGEVEC_SIZE), pvec->pages);
+	return pagevec_count(pvec);
+}
+EXPORT_SYMBOL(pagevec_lookup_range_tag);
 /*
  * Perform any setup for the swap system
  */
-- 
2.12.3

--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org.  For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>