1 files changed, 21 insertions, 10 deletions

diff --git a/fs/splice.c b/fs/splice.c
index b0c157d76948..3318b965c10b 100644
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -78,7 +78,6 @@ static int page_cache_pipe_buf_steal(struct pipe_inode_info *info,
                 return 1;
         }
 
-        buf->flags |= PIPE_BUF_FLAG_LRU;
         return 0;
 }
 
@@ -86,8 +85,6 @@ static void page_cache_pipe_buf_release(struct pipe_inode_info *info,
                                         struct pipe_buffer *buf)
 {
         page_cache_release(buf->page);
-        buf->page = NULL;
-        buf->flags &= ~PIPE_BUF_FLAG_LRU;
 }
 
 static int page_cache_pipe_buf_pin(struct pipe_inode_info *info,
@@ -570,22 +567,36 @@ static int pipe_to_file(struct pipe_inode_info *info, struct pipe_buffer *buf,
         if ((sd->flags & SPLICE_F_MOVE) && this_len == PAGE_CACHE_SIZE) {
                 /*
                  * If steal succeeds, buf->page is now pruned from the vm
-                 * side (LRU and page cache) and we can reuse it. The page
-                 * will also be looked on successful return.
+                 * side (page cache) and we can reuse it. The page will also
+                 * be locked on successful return.
                  */
                 if (buf->ops->steal(info, buf))
                         goto find_page;
 
                 page = buf->page;
+                page_cache_get(page);
+
+                /*
+                 * page must be on the LRU for adding to the pagecache.
+                 * Check this without grabbing the zone lock, if it isn't
+                 * the do grab the zone lock, recheck, and add if necessary.
+                 */
+                if (!PageLRU(page)) {
+                        struct zone *zone = page_zone(page);
+
+                        spin_lock_irq(&zone->lru_lock);
+                        if (!PageLRU(page)) {
+                                SetPageLRU(page);
+                                add_page_to_inactive_list(zone, page);
+                        }
+                        spin_unlock_irq(&zone->lru_lock);
+                }
+
                 if (add_to_page_cache(page, mapping, index, gfp_mask)) {
+                        page_cache_release(page);
                         unlock_page(page);
                         goto find_page;
                 }
-
-                page_cache_get(page);
-
-                if (!(buf->flags & PIPE_BUF_FLAG_LRU))
-                        lru_cache_add(page);
         } else {
 find_page:
                 page = find_lock_page(mapping, index);