[PATCH 15/35] btrfs: Use pagevec_lookup_range_tag()

[Jan Kara]

We want only pages from given range in btree_write_cache_pages() and
extent_write_cache_pages(). Use pagevec_lookup_range_tag() instead of
pagevec_lookup_tag() and remove unnecessary code.

CC: linux-btrfs at vger.kernel.org
CC: David Sterba <dsterba at suse.com>
Signed-off-by: Jan Kara <jack at suse.cz>
---
 fs/btrfs/extent_io.c | 19 ++++---------------
 1 file changed, 4 insertions(+), 15 deletions(-)

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index d8da3edf2ac3..6287eaba30ac 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -3837,8 +3837,8 @@ int btree_write_cache_pages(struct address_space *mapping,
 	if (wbc->sync_mode == WB_SYNC_ALL)
 		tag_pages_for_writeback(mapping, index, end);
 	while (!done && !nr_to_write_done && (index <= end) &&
-	       (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, tag,
-			min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1))) {
+	       (nr_pages = pagevec_lookup_range_tag(&pvec, mapping, &index, end,
+			tag, PAGEVEC_SIZE))) {
 		unsigned i;
 
 		scanned = 1;
@@ -3848,11 +3848,6 @@ int btree_write_cache_pages(struct address_space *mapping,
 			if (!PagePrivate(page))
 				continue;
 
-			if (!wbc->range_cyclic && page->index > end) {
-				done = 1;
-				break;
-			}
-
 			spin_lock(&mapping->private_lock);
 			if (!PagePrivate(page)) {
 				spin_unlock(&mapping->private_lock);
@@ -3984,8 +3979,8 @@ static int extent_write_cache_pages(struct address_space *mapping,
 		tag_pages_for_writeback(mapping, index, end);
 	done_index = index;
 	while (!done && !nr_to_write_done && (index <= end) &&
-	       (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, tag,
-			min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1))) {
+	       (nr_pages = pagevec_lookup_range_tag(&pvec, mapping, &index, end,
+			tag, PAGEVEC_SIZE))) {
 		unsigned i;
 
 		scanned = 1;
@@ -4010,12 +4005,6 @@ static int extent_write_cache_pages(struct address_space *mapping,
 				continue;
 			}
 
-			if (!wbc->range_cyclic && page->index > end) {
-				done = 1;
-				unlock_page(page);
-				continue;
-			}
-
 			if (wbc->sync_mode != WB_SYNC_NONE) {
 				if (PageWriteback(page))
 					flush_fn(data);
-- 
2.12.3