diff options
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/splice.c | 31 |
1 files changed, 21 insertions, 10 deletions
diff --git a/fs/splice.c b/fs/splice.c index b0c157d7694..3318b965c10 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); |