Btrfs: use add_to_page_cache_lru, use __page_cache_alloc

Pagecache pages should be allocated with __page_cache_alloc, so they
obey pagecache memory policies.

add_to_page_cache_lru is exported, so it should be used. Benefits over
using a private pagevec: neater code, 128 bytes fewer stack used, percpu
lru ordering is preserved, and finally don't need to flush pagevec
before returning so batching may be shared with other LRU insertions.

Signed-off-by: Nick Piggin <npiggin@suse.de>:
Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 1 insertions, 14 deletions

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index c99121ac5d6b..fc742e59815e 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -2679,33 +2679,20 @@ int extent_readpages(struct extent_io_tree *tree,
 {
         struct bio *bio = NULL;
         unsigned page_idx;
-        struct pagevec pvec;
         unsigned long bio_flags = 0;
 
-        pagevec_init(&pvec, 0);
         for (page_idx = 0; page_idx < nr_pages; page_idx++) {
                 struct page *page = list_entry(pages->prev, struct page, lru);
 
                 prefetchw(&page->flags);
                 list_del(&page->lru);
-                /*
-                 * what we want to do here is call add_to_page_cache_lru,
-                 * but that isn't exported, so we reproduce it here
-                 */
-                if (!add_to_page_cache(page, mapping,
+                if (!add_to_page_cache_lru(page, mapping,
                                         page->index, GFP_KERNEL)) {
-
-                        /* open coding of lru_cache_add, also not exported */
-                        page_cache_get(page);
-                        if (!pagevec_add(&pvec, page))
-                                __pagevec_lru_add_file(&pvec);
                         __extent_read_full_page(tree, page, get_extent,
                                                 &bio, 0, &bio_flags);
                 }
                 page_cache_release(page);
         }
-        if (pagevec_count(&pvec))
-                __pagevec_lru_add_file(&pvec);
         BUG_ON(!list_empty(pages));
         if (bio)
                 submit_one_bio(READ, bio, 0, bio_flags);