1 files changed, 8 insertions, 0 deletions

diff --git a/fs/open.c b/fs/open.c
index a59abe3c669a..c60cd22cc052 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -818,6 +818,14 @@ static int do_dentry_open(struct file *f,
                 if (!f->f_mapping->a_ops || !f->f_mapping->a_ops->direct_IO)
                         return -EINVAL;
         }
+
+        /*
+         * XXX: Huge page cache doesn't support writing yet. Drop all page
+         * cache for this file before processing writes.
+         */
+        if ((f->f_mode & FMODE_WRITE) && filemap_nr_thps(inode->i_mapping))
+                truncate_pagecache(inode, 0);
+
         return 0;
 
 cleanup_all: