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 <jack@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@vger.kernel.org
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index d5dd7d4..0918452 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -4514,8 +4514,12 @@
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