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 /volumes.h | |
| 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 'volumes.h')
| -rw-r--r-- | volumes.h | 10 |
1 files changed, 8 insertions, 2 deletions
@@ -135,6 +135,10 @@ struct map_lookup { #define BTRFS_BALANCE_ARGS_CONVERT (1ULL << 8) #define BTRFS_BALANCE_ARGS_SOFT (1ULL << 9) +#define BTRFS_RAID5_P_STRIPE ((u64)-2) +#define BTRFS_RAID6_Q_STRIPE ((u64)-1) + + int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans, struct btrfs_device *device, u64 chunk_tree, u64 chunk_objectid, @@ -142,10 +146,12 @@ int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans, u64 num_bytes, u64 *start); int __btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw, u64 logical, u64 *length, u64 *type, - struct btrfs_multi_bio **multi_ret, int mirror_num); + struct btrfs_multi_bio **multi_ret, int mirror_num, + u64 **raid_map); int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw, u64 logical, u64 *length, - struct btrfs_multi_bio **multi_ret, int mirror_num); + struct btrfs_multi_bio **multi_ret, int mirror_num, + u64 **raid_map_ret); int btrfs_next_metadata(struct btrfs_mapping_tree *map_tree, u64 *logical, u64 *size); int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree, |