gfs2: jdata writepage fix

gfs2: jdata writepage fix

BugLink: https://bugs.launchpad.net/bugs/2011425
[ Upstream commit cbb60951ce18c9b6e91d2eb97deb41d8ff616622 ]

The ->writepage() and ->writepages() operations are supposed to write
entire pages.  However, on filesystems with a block size smaller than
PAGE_SIZE, __gfs2_jdata_writepage() only adds the first block to the
current transaction instead of adding the entire page.  Fix that.

Fixes: 18ec7d5c3f43 ("[GFS2] Make journaled data files identical to normal files on disk")
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Andrea Righi <andrea.righi@canonical.com>