[sheepdog] [sheepdog/sheepdog] 3ece44: sheep: handle OOM error gracefully when receive SD...

[Hitoshi Mitake]

  Branch: refs/heads/master
  Home:   https://github.com/sheepdog/sheepdog
  Commit: 3ece4457a31755930afa2a8f5b6712e8093e8b7f
      https://github.com/sheepdog/sheepdog/commit/3ece4457a31755930afa2a8f5b6712e8093e8b7f
  Author: Takashi Menjo <menjo.takashi at lab.ntt.co.jp>
  Date:   2016-09-28 (Wed, 28 Sep 2016)

  Changed paths:
    M sheep/object_list_cache.c

  Log Message:
  -----------
  sheep: handle OOM error gracefully when receive SD_OP_GET_OBJ_LIST

When a sheep receives SD_OP_GET_OBJ_LIST request, xrealloc is called to
allocate memory for object list which is being sent to the requesting.
However, xrealloc panics if out-of-memory (OOM) error occurs. In this
case, the sheep goes down. This is not good for stable running.

This commit lets sheep handle OOM error gracefully when it receives
SD_OP_GET_OBJ_LIST. If OOM error occurs, sheep returns SD_RES_NO_MEM.
This is realized by using realloc instead of xrealloc (note "x") and
check whether errno is set to ENOMEM or not.

Signed-off-by: Takashi Menjo <menjo.takashi at lab.ntt.co.jp>


  Commit: d1a93b9bb79d23acb6ecb4bd5d238e7e3e8b8cdb
      https://github.com/sheepdog/sheepdog/commit/d1a93b9bb79d23acb6ecb4bd5d238e7e3e8b8cdb
  Author: Takashi Menjo <menjo.takashi at lab.ntt.co.jp>
  Date:   2016-09-29 (Thu, 29 Sep 2016)

  Changed paths:
    M sheep/object_list_cache.c

  Log Message:
  -----------
  sheep: goto style error handling of get_obj_list

Signed-off-by: Takashi Menjo <menjo.takashi at lab.ntt.co.jp>


  Commit: 408b7744e52db61dc07d4e70d32f8f1f7310ba5b
      https://github.com/sheepdog/sheepdog/commit/408b7744e52db61dc07d4e70d32f8f1f7310ba5b
  Author: Hitoshi Mitake <mitake.hitoshi at gmail.com>
  Date:   2016-09-30 (Fri, 30 Sep 2016)

  Changed paths:
    M sheep/object_list_cache.c

  Log Message:
  -----------
  Merge pull request #314 from tmenjo/fix-getobjlist

sheep: handle OOM error gracefully when receive SD_OP_GET_OBJ_LIST


Compare: https://github.com/sheepdog/sheepdog/compare/551480c40bba...408b7744e52d