[sheepdog] [PATCH 0/5] introduce writethrough mode to object cache

[Liu Yuan]

From: Liu Yuan <tailai.ly at taobao.com>

    This patch set does some refactors and mainly introduce writethrough mode.
	
    Object cache writethrough mode provide us a read-only cache which is alwasy
    consistent with backend store.
    
    We can set the object cache mode by 'w' option as following:
    
     sheep -w cache_size{,writethrough | writeback}
    
    For e.g, we can set 1G size writethrough cache:
     $ sheep -w 1000,writethrough
     $ sheep -w 1000
    
    writethrough mode is default object cache
    
    to set as writeback cache:
     $ sheep -w 1000,writeback

Liu Yuan (5):
  object cache: remove file lock in create_cache_object()
  object cache: refactor read/write path
  object cache: add a new helper to get the entry idx
  object cache: remove redundant code
  object cache: implement writethrough mode

 sheep/object_cache.c |  332 ++++++++++++++++++++++++++++----------------------
 sheep/sheep.c        |   22 +++-
 sheep/sheep_priv.h   |    1 +
 3 files changed, 206 insertions(+), 149 deletions(-)

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1.7.10.2