[sheepdog] [sheepdog/sheepdog] f1cbc1: sheep: parallelize inode bitmap gathering process

[Hitoshi Mitake]

  Branch: refs/heads/for-142
  Home:   https://github.com/sheepdog/sheepdog
  Commit: f1cbc1c94d3d9413697b476220169ab56ef5d38c
      https://github.com/sheepdog/sheepdog/commit/f1cbc1c94d3d9413697b476220169ab56ef5d38c
  Author: Hitoshi Mitake <mitake.hitoshi at lab.ntt.co.jp>
  Date:   2016-03-25 (Fri, 25 Mar 2016)

  Changed paths:
    M sheep/group.c
    M sheep/sheep.c
    M sheep/sheep_priv.h

  Log Message:
  -----------
  sheep: parallelize inode bitmap gathering process

This commit is a performance improvement of the previous commit. The
inode bitmap gathering process can be parallelized for fast
completion.

Signed-off-by: Hitoshi Mitake <mitake.hitoshi at lab.ntt.co.jp>