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-rw-r--r--mm/shmem.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/mm/shmem.c b/mm/shmem.c
index 9b5eeb4af508..9e71b6ca35eb 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -669,8 +669,16 @@ done2:
* generic_delete_inode did it, before we lowered next_index.
* Also, though shmem_getpage checks i_size before adding to
* cache, no recheck after: so fix the narrow window there too.
+ *
+ * Recalling truncate_inode_pages_range and unmap_mapping_range
+ * every time for punch_hole (which never got a chance to clear
+ * SHMEM_PAGEIN at the start of vmtruncate_range) is expensive,
+ * yet hardly ever necessary: try to optimize them out later.
*/
truncate_inode_pages_range(inode->i_mapping, start, end);
+ if (punch_hole)
+ unmap_mapping_range(inode->i_mapping, start,
+ end - start, 1);
}
spin_lock(&info->lock);