[GIT PULL REQUEST] md updates for 4.1

From: NeilBrown
Date: Thu Apr 23 2015 - 02:15:12 EST

Hi Linus,
more updates that usual this time. A few have performance impacts which
should mostly be positive, but RAID5 (in particular) can be very work-load
sensitive .... we'll have to wait and see.
More detailed highlights below.


The following changes since commit 47d68979cc968535cb87f3e5f2e6a3533ea48fbd:

md/raid0: fix bug with chunksize not a power of 2. (2015-04-10 15:36:31 +1000)

are available in the git repository at:

git://neil.brown.name/md/ tags/md/4.1

for you to fetch changes up to 9ffc8f7cb9647b13dfe4d1ad0d5e1427bb8b46d6:

md/raid5: don't do chunk aligned read on degraded array. (2015-04-22 08:00:43 +1000)

md updates for 4.1


- "experimental" code for managing md/raid1 across a cluster using
DLM. Code is not ready for general use and triggers a WARNING if used.
However it is looking good and mostly done and having in mainline
will help co-ordinate development.
- RAID5/6 can now batch multiple (4K wide) stripe_heads so as to
handle a full (chunk wide) stripe as a single unit.
- RAID6 can now perform read-modify-write cycles which should
help performance on larger arrays: 6 or more devices.
- RAID5/6 stripe cache now grows and shrinks dynamically. The value
set is used as a minimum.
- Resync is now allowed to go a little faster than the 'mininum' when
there is competing IO. How much faster depends on the speed of the
devices, so the effective minimum should scale with device speed to
some extent.

Eric Mei (1):
md/raid5: don't do chunk aligned read on degraded array.

Goldwyn Rodrigues (31):
md-cluster: Design Documentation
Add number of nodes to bitmap structure for clustering
Create a separate module for clustering support
DLM lock and unlock functions
Introduce md_cluster_operations to handle cluster functions
Introduce md_cluster_info
Return MD_SB_CLUSTERED if mddev is clustered
Add node recovery callbacks
Use separate bitmaps for each nodes in the cluster
Lock bitmap while joining the cluster
Gather on-going resync information of other nodes
bitmap_create returns bitmap pointer
Copy set bits from another slot
Initiate recovery on node failure
Perform resync for cluster node failure
Communication Framework: Receiving
Communication Framework: Sending functions
metadata_update sends message to other nodes
Reload superblock if METADATA_UPDATED is received
Send RESYNCING while performing resync start/stop
Resync start/Finish actions
Suspend writes in RAID1 if within range
Read from the first device when an area is resyncing
Add new disk to clustered array
md: Fix stray --cluster-confirm crash
md: Fix bitmap offset calculations
md: Export and rename kick_rdev_from_array
md: Export and rename find_rdev_nr_rcu
md-cluster: remove capabilities
md: re-add a failed disk
md-cluster: re-add capabilities

Guoqing Jiang (1):
md-cluster: correct the num for comparison

Heinz Mauelshagen (1):
md raid0: access mddev->queue (request queue member) conditionally because it is not set when accessed from dm-raid

Markus Stockhausen (6):
md/raid6 algorithms: delta syndrome functions
md/raid6 algorithms: improve test program
md/raid6 algorithms: xor_syndrome() for generic int
md/raid6 algorithms: xor_syndrome() for SSE2
md/raid5: activate raid6 rmw feature
md/raid5: introduce configuration option rmw_level

NeilBrown (10):
md: fix error paths from bitmap_create.
md/bitmap: fix incorrect DIV_ROUND_UP usage.
Merge branch 'cluster' into for-next
md: don't require sync_min to be a multiple of chunk_size.
md: remove 'go_faster' option from ->sync_request()
md: allow resync to go faster when there is competing IO.
md/raid5: pass gfp_t arg to grow_one_stripe()
md/raid5: move max_nr_stripes management into grow_one_stripe and drop_one_stripe
md/raid5: change ->inactive_blocked to a bit-flag.
md/raid5: allow the stripe_cache to grow and shrink.

Stephen Rothwell (1):
md/bitmap: use sector_div for sector_t divisions

kbuild test robot (2):
md: recover_bitmaps() can be static
md/cluster: Communication Framework: fix semicolon.cocci warnings

shli@xxxxxxxxxx (6):
raid5: use flex_array for scribble data
raid5: add a new flag to track if a stripe can be batched
raid5: track overwrite disk count
RAID5: batch adjacent full stripe write
raid5: handle io error of batch list
raid5: handle expansion/resync case with stripe batching

Documentation/md-cluster.txt | 176 ++++++++
crypto/async_tx/async_pq.c | 19 +-
drivers/md/Kconfig | 16 +
drivers/md/Makefile | 1 +
drivers/md/bitmap.c | 189 +++++++-
drivers/md/bitmap.h | 10 +-
drivers/md/md-cluster.c | 965 +++++++++++++++++++++++++++++++++++++++++
drivers/md/md-cluster.h | 29 ++
drivers/md/md.c | 382 +++++++++++++---
drivers/md/md.h | 26 +-
drivers/md/raid0.c | 48 +-
drivers/md/raid1.c | 29 +-
drivers/md/raid10.c | 8 +-
drivers/md/raid5.c | 826 +++++++++++++++++++++++++++++------
drivers/md/raid5.h | 59 ++-
include/linux/async_tx.h | 3 +
include/linux/raid/pq.h | 1 +
include/uapi/linux/raid/md_p.h | 7 +
include/uapi/linux/raid/md_u.h | 1 +
lib/raid6/algos.c | 41 +-
lib/raid6/altivec.uc | 1 +
lib/raid6/avx2.c | 3 +
lib/raid6/int.uc | 41 +-
lib/raid6/mmx.c | 2 +
lib/raid6/neon.c | 1 +
lib/raid6/sse1.c | 2 +
lib/raid6/sse2.c | 227 ++++++++++
lib/raid6/test/test.c | 51 ++-
lib/raid6/tilegx.uc | 1 +
29 files changed, 2860 insertions(+), 305 deletions(-)
create mode 100644 Documentation/md-cluster.txt
create mode 100644 drivers/md/md-cluster.c
create mode 100644 drivers/md/md-cluster.h

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