[PATCH v3 0/8] MD: a caching layer for raid5/6

[Shaohua Li <shli@fb.com>]

Hi,

This is the third version of the raid5/6 caching layer patches. The patches add
a caching layer for raid5/6. The caching layer uses a SSD as a cache for a raid
5/6. It works like the similar way of a hardware raid controller. The purpose
is to improve raid performance (reduce read-modify-write) and fix write hole
issue. The main patch is patch 3 and the description has all details about the
implementation. Please review!

Thanks,
Shaohua

V3:
-make reclaim multi-thread
-add statistics in sysfs
-bug fixes

V2:
-metadata write doesn't use FUA
-discard request is only issued when necessary
-bug fixes and cleanup

Shaohua Li (7):
  raid5: directly use mddev->queue
  raid5: A caching layer for RAID5/6
  raid5: add some sysfs entries
  md: don't allow resize/reshape with cache support
  raid5: skip resync if caching is enabled
  raid5: guarantee cache release stripes in correct way
  raid5: multi-thread support for raid5 caching reclaim

Song Liu (1):
  MD: add a new disk role to present cache device

 drivers/md/Makefile            |    2 +-
 drivers/md/md.c                |   14 +-
 drivers/md/md.h                |    4 +
 drivers/md/raid5-cache.c       | 3775 ++++++++++++++++++++++++++++++++++++++++
 drivers/md/raid5.c             |  177 +-
 drivers/md/raid5.h             |   25 +-
 include/uapi/linux/raid/md_p.h |   73 +
 7 files changed, 4022 insertions(+), 48 deletions(-)
 create mode 100644 drivers/md/raid5-cache.c

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1.8.1