[GIT PULL REQUEST] md updates for 3.20

[NeilBrown]

Hi Linus,
 20 is a big number ... is it time for 4.0 yet :-)

 anyway, herewith is my pull request for 3.20.   It has been sitting in
 -next for a while, and Dan's scripts only found 2 bugs - now fixed.

Thanks,
NeilBrown


The following changes since commit d95901433436aeb921eac58bfd8a2aa77f110384:

  md/bitmap: fix a might_sleep() warning. (2015-02-02 17:08:03 +1100)

are available in the git repository at:

  git://neil.brown.name/md tags/md/3.20

for you to fetch changes up to 53a6ab4d3f6d6dc87ec8f14998b4b5536ee2968c:

  md/raid10: fix conversion from RAID0 to RAID10 (2015-02-12 14:09:57 +1100)

----------------------------------------------------------------
md updates for 3.20

 - assorted locking changes so that access to /proc/mdstat
   and much of /sys/block/mdXX/md/* is protected by a spinlock
   rather than a mutex and will never block indefinitely.

 - Make an 'if' condition in RAID5 - which has been implicated
   in recent bugs - more readable.

 - misc minor fixes

----------------------------------------------------------------
Hannes Reinecke (1):
      md: wakeup thread upon rdev_dec_pending()

Jan Beulich (1):
      x86/raid6: correctly check for assembler capabilities

Jes Sorensen (1):
      md: do_release_stripe(): No need to call md_wakeup_thread() twice

NeilBrown (25):
      md/raid5: separate large if clause out of fetch_block().
      md/raid5: separate out the easy conditions in need_this_block.
      md/raid5: need_this_block: start simplifying the last two conditions.
      md/raid5: need_this_block: tidy/fix last condition.
      md: rename mddev->write_lock to mddev->lock
      md: make ->congested robust against personality changes.
      md: make merge_bvec_fn more robust in face of personality changes.
      md/linear: remove rcu protections in favour of suspend/resume
      md: split detach operation out from ->stop.
      md: rename ->stop to ->free
      md: level_store: group all important changes into one place.
      md: protect ->pers changes with mddev->lock
      md/bitmap: protect clearing of ->bitmap by mddev->lock
      md: remove need for mddev_lock() in md_seq_show()
      md/raid5: use ->lock to protect accessing raid5 sysfs attributes.
      md: remove mddev_lock() from md_attr_show()
      md: remove mddev_lock from rdev_attr_show()
      md: remove unnecessary 'buf' from get_bitmap_file.
      md: tidy up set_bitmap_file
      md: move GET_BITMAP_FILE ioctl out from mddev_lock.
      md: minor cleanup in safe_delay_store.
      md: use mddev->lock to protect updates to resync_{min,max}.
      md: move mddev_lock and related to md.h
      md: make reconfig_mutex optional for writes to md sysfs files.
      md/raid10: fix conversion from RAID0 to RAID10

 arch/x86/Makefile       |   1 +
 drivers/md/bitmap.c     |  15 +-
 drivers/md/dm-raid.c    |   8 +-
 drivers/md/faulty.c     |   8 +-
 drivers/md/linear.c     |  67 ++--
 drivers/md/md.c         | 816 ++++++++++++++++++++++++++++++------------------
 drivers/md/md.h         |  57 +++-
 drivers/md/multipath.c  |  22 +-
 drivers/md/raid0.c      |  29 +-
 drivers/md/raid1.c      |  52 +--
 drivers/md/raid1.h      |   3 -
 drivers/md/raid10.c     |  49 +--
 drivers/md/raid10.h     |   3 -
 drivers/md/raid5.c      | 334 ++++++++++++--------
 drivers/md/raid5.h      |   1 -
 lib/raid6/algos.c       |   2 +-
 lib/raid6/recov_avx2.c  |   2 +-
 lib/raid6/recov_ssse3.c |   6 +
 18 files changed, 867 insertions(+), 608 deletions(-)

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