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* btrfs-progs: fix unaligned access in raid6 calculationsDavid Sterba2016-07-291-4/+12
| | | | | | | | | | The raid6 code matches kernel implementation that also does the unaligned access. So to keep the code close, add helpers for unaligned native access and use them. The helpers are local as we don't plan to use them elsewhere. Reported-by: Anatoly Pugachev <matorola@gmail.com> Signed-off-by: David Sterba <dsterba@suse.com>
* btrfs-progs: give raid6.c its exported prototypesZach Brown2013-09-031-0/+2
| | | | | | | | | | | | | | | raid6.c is built without access to the prototypes of functions it exports. warning: symbol 'raid6_gen_syndrome' was not declared. Should it be static? They could be changed and get out of sync of the exported prototypes without errors. So we add disk-io.h, and its dependency ctree.h, so that it has a chance to check that its exported prototypes are correct. Signed-off-by: Zach Brown <zab@redhat.com> Signed-off-by: David Sterba <dsterba@suse.cz> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
* btrfs-progs: include kerncompat.h in raid6.c, define __attribute_const__Eric Sandeen2013-02-031-0/+2
| | | | | | | | | | | | | | | raid6.c was failing to build for Goffredo and me due to __attribute_const__ being undefined. Define it in kerncompat.h and include that; this also makes sure BITS_PER_LONG is defined for raid6.c, prior to this it was not defined, at least in my build. Finally, redefine BITS_PER_LONG in a way that it can be tested in the preprocessor macro. Signed-off-by: Eric Sandeen <sandeen@redhat.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
* Add basic RAID[56] supportDavid Woodhouse2013-02-011-0/+97
David Woodhouse originally contributed this code, and Chris Mason changed it around to reflect the current design goals for raid56. The original code expected all metadata and data writes to be full stripes. This meant metadata block size == stripe size, and had a few other restrictions. This version allows metadata blocks smaller than the stripe size. It implements both raid5 and raid6, although it does not have code to rebuild from parity if one of the drives is missing or incorrect. Signed-off-by: David Woodhouse <David.Woodhouse@intel.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>