The ext3 MDS code. Basically, we have to hack around the fact that ext3

The ext3 MDS code.  Basically, we have to hack around the fact that ext3
does not have the directories in page cache, so we need to export the
ext3_bread() function in order to ensure we read the same data as what the
filesystem itself is using.  This will likely go away at some time in the
future as ext3 is ported to the pure page-cache-based directory handling
that is in ext2 (which is slightly more efficient).