[sheepdog] [PATCH v5 0/8] make IO requests to wait in recovery instead of busy retrying

[levin li]

From: levin li <xingke.lwp at taobao.com>

v4 ---> v5:
1. fix some coding style
2. fix incorrect nr_oustanding_io incrementing
3. make gateway request wait to retry when the requested object in recovery is local

levin li (8):
  sheep: port list_splice_tail_init() from linux kernel
  sheep: make requests with new epoch sleep until epoch is updated
  sheep: make gateway to retry when received SD_RES_OLD_NODE_VER
  recovery: make IO request to wait when recovery is in RW_INIT
  recovery: make IO request to wait when the requested object is in
    recovery
  recovery: clear the object wait queue when new recovery work comes
  recovery: fix a race condition in recovery
  sheep: make gateway requests only retry when requested object is
    local

 include/list.h           |    9 +++
 include/sheepdog_proto.h |    1 +
 sheep/group.c            |    2 +
 sheep/recovery.c         |   50 +++++++++++++++--
 sheep/sdnet.c            |  139 +++++++++++++++++++++++++++++++++-------------
 sheep/sheep_priv.h       |    5 ++
 6 files changed, 162 insertions(+), 44 deletions(-)

-- 
1.7.10