From 78cee20d970646bda1071ae43de5db29267d8e45 Mon Sep 17 00:00:00 2001 From: Jan Kara Date: Wed, 1 Oct 2014 21:49:46 -0400 Subject: ext4: fix mmap data corruption when blocksize < pagesize commit d6320cbfc92910a3e5f10c42d98c231c98db4f60 upstream. 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 Signed-off-by: Greg Kroah-Hartman --- fs/ext4/inode.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) (limited to 'fs/ext4') diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index b56062dc8b62..6b6e8c5a319d 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -4645,8 +4645,12 @@ 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 -- cgit v1.2.3