22 Apr, 2015

1 commit

• fe5cbc6e0   md/raid6 algorithms: delta syndrome functions ... Browse Code »

  v3: s-o-b comment, explanation of performance and descision for
  the start/stop implementation

  Implementing rmw functionality for RAID6 requires optimized syndrome
  calculation. Up to now we can only generate a complete syndrome. The
  target P/Q pages are always overwritten. With this patch we provide
  a framework for inplace P/Q modification. In the first place simply
  fill those functions with NULL values.

  xor_syndrome() has two additional parameters: start & stop. These
  will indicate the first and last page that are changing during a
  rmw run. That makes it possible to avoid several unneccessary loops
  and speed up calculation. The caller needs to implement the following
  logic to make the functions work.

  1) xor_syndrome(disks, start, stop, ...): "Remove" all data of source
  blocks inside P/Q between (and including) start and end.

  2) modify any block with start
  Signed-off-by: NeilBrown

  Markus Stockhausen

  2015-04-22 06:00:41 +0800  

13 Dec, 2012

1 commit

• 4f8c55c5a   lib/raid6: build proper files on corresponding arch ... Browse Code »

  sse and avx2 stuff only exist on x86 arch, and we don't need to build
  altivec on x86. And we can do that at lib/raid6/Makefile.

  Proposed-by: H. Peter Anvin
  Signed-off-by: Yuanhan Liu
  Reviewed-by: H. Peter Anvin
  Signed-off-by: Jim Kukunas
  Signed-off-by: NeilBrown

  Yuanhan Liu

  2012-12-13 16:51:04 +0800  

12 Aug, 2010

1 commit

• a8e026c78   Further tidyup of raid6 naming in lib/raid6 ... Browse Code »

  Rename raid6/raid6x86.h to raid6/x86.h
  and modify some comments.

  Signed-off-by: NeilBrown

  NeilBrown

  2010-08-12 04:44:54 +0800  

11 Aug, 2010

1 commit

• cc4589ebf   Rename raid6 files now they're in a 'raid6' directory. ... Browse Code »

  Linus asks 'why "raid6" twice?'. No reason.

  Signed-off-by: David Woodhouse

  David Woodhouse

  2010-08-11 07:19:05 +0800