diff options
| author | David Woodhouse <David.Woodhouse@intel.com> | 2009-07-11 18:12:37 +0100 |
|---|---|---|
| committer | Chris Mason <chris.mason@fusionio.com> | 2013-02-01 14:22:07 -0500 |
| commit | 4d48b96b280a76f29eb5d5f1578559932f551b2d (patch) | |
| tree | c67db59d335759896fcb3c05d54f1a3232dd6471 /extent_io.c | |
| parent | 6f082141d0a608c286c3f1b42ddd558e72ea1d9f (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 <David.Woodhouse@intel.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
Diffstat (limited to 'extent_io.c')
| -rw-r--r-- | extent_io.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/extent_io.c b/extent_io.c index ebb35b28..45fa6bf6 100644 --- a/extent_io.c +++ b/extent_io.c @@ -663,13 +663,14 @@ struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree, return 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 ret; - ret = pread(eb->fd, eb->data, eb->len, eb->dev_bytenr); + ret = pread(eb->fd, eb->data + offset, len, eb->dev_bytenr); if (ret < 0) goto out; - if (ret != eb->len) { + if (ret != len) { ret = -EIO; goto out; } |