f2fs: drop obsolete node page when it is truncated

If a node page is trucated, we'd better drop the page in the node_inode's page
cache for better memory footprint.

Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>

diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index bbfc655..b0649b7 100644 (file)
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -518,6 +518,10 @@ invalidate:
        F2FS_SET_SB_DIRT(sbi);
 
        f2fs_put_page(dn->node_page, 1);
+
+       invalidate_mapping_pages(NODE_MAPPING(sbi),
+                       dn->node_page->index, dn->node_page->index);
+
        dn->node_page = NULL;
        trace_f2fs_truncate_node(dn->inode, dn->nid, ni.blk_addr);
 }