AOSP: libext2fs: android sparse io manager

Add a new io manager to directly output sparse images.

Test: mke2fs [...] -E sparse_file;
      simg2img system.img system.ext4;
      e2fsck system.ext4

Change-Id: I41cf8c1b33d359be4f104e03fb4041863214843c
From AOSP commit: f9e0f1d4a7cf32c4091eee7d2a1676cac1d17438

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
6 files changed