libext2fs: add ext2fs_extent_open2

The patch below adds a function, ext2fs_extent_open2(), that behaves
as ext2fs_extent_open(), but will use the user-supplied inode
structure when opening an extent instead of reading the inode from
disk.  It also changes several of the calls to extent_open() to use
this enhancement.

Signed-off-by: Nic Case <number9652@yahoo.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
5 files changed