From d6320cbfc92910a3e5f10c42d98c231c98db4f60 Mon Sep 17 00:00:00 2001 From: Jan Kara Date: Wed, 1 Oct 2014 21:49:46 -0400 Subject: [PATCH] ext4: fix mmap data corruption when blocksize < pagesize Use truncate_isize_extended() when hole is being created in a file so that ->page_mkwrite() will get called for the partial tail page if it is mmaped (see the first patch in the series for details). Signed-off-by: Jan Kara Signed-off-by: Theodore Ts'o Cc: stable@vger.kernel.org --- fs/ext4/inode.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index d5dd7d46844e..091845298f48 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -4514,8 +4514,12 @@ int ext4_setattr(struct dentry *dentry, struct iattr *attr) ext4_orphan_del(NULL, inode); goto err_out; } - } else + } else { + loff_t oldsize = inode->i_size; + i_size_write(inode, attr->ia_size); + pagecache_isize_extended(inode, oldsize, inode->i_size); + } /* * Blocks are going to be removed from the inode. Wait