MFC r253651, r253652, r253657;

MFC	r253651, r253652, r253657;

ext2fs: Don't assume that on-disk format of a directory is the same
as in <sys/dirent.h>

ext2_readdir() has always been very fs specific and different
with respect to its ufs_ counterpart. Recent changes from UFS
have made it possible to share more closely the implementation.

Always start parsing at DIRBLKSIZ aligned offset, skip first entries if
uio_offset is not DIRBLKSIZ aligned. Return EINVAL if buffer is too
small for single entry.

Preallocate buffer for cookies.

Skip entries with zero inode number.

Reviewed by:	gleb, Zheng Liu

git-svn-id: svn://svn.freebsd.org/base/stable/9@254801 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f