path: root/extent_io.h
diff options
authorDavid Woodhouse <>2009-07-11 18:12:37 +0100
committerChris Mason <>2013-02-01 14:22:07 -0500
commit4d48b96b280a76f29eb5d5f1578559932f551b2d (patch)
treec67db59d335759896fcb3c05d54f1a3232dd6471 /extent_io.h
parent6f082141d0a608c286c3f1b42ddd558e72ea1d9f (diff)
Add basic RAID[56] support
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 <> Signed-off-by: Chris Mason <>
Diffstat (limited to 'extent_io.h')
1 files changed, 2 insertions, 1 deletions
diff --git a/extent_io.h b/extent_io.h
index a5d6bf0e..5df44f7d 100644
--- a/extent_io.h
+++ b/extent_io.h
@@ -95,7 +95,8 @@ struct extent_buffer *find_first_extent_buffer(struct extent_io_tree *tree,
struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
u64 bytenr, u32 blocksize);
void free_extent_buffer(struct extent_buffer *eb);
-int read_extent_from_disk(struct extent_buffer *eb);
+int read_extent_from_disk(struct extent_buffer *eb,
+ unsigned long offset, unsigned long len);
int write_extent_to_disk(struct extent_buffer *eb);
int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
unsigned long start, unsigned long len);