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| author | Johannes Thumshirn <johannes.thumshirn@wdc.com> | 2023-09-14 09:06:56 -0700 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2023-10-12 16:44:09 +0200 |
| commit | ee1293308e01d359688243d665138f35a6f1f9b8 (patch) | |
| tree | ac1bf03fe6de5c9605e9423a5466dd4ce624b59a /include/uapi/linux/btrfs_tree.h | |
| parent | 6d3a61945b0088106a9cba9023094a5712df0092 (diff) | |
| download | linux-ee1293308e01d359688243d665138f35a6f1f9b8.tar.gz linux-ee1293308e01d359688243d665138f35a6f1f9b8.tar.bz2 linux-ee1293308e01d359688243d665138f35a6f1f9b8.zip | |
btrfs: add raid stripe tree definitions
Add definitions for the raid stripe tree. This tree will hold information
about the on-disk layout of the stripes in a RAID set.
Each stripe extent has a 1:1 relationship with an on-disk extent item and
is doing the logical to per-drive physical address translation for the
extent item in question.
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'include/uapi/linux/btrfs_tree.h')
| -rw-r--r-- | include/uapi/linux/btrfs_tree.h | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/include/uapi/linux/btrfs_tree.h b/include/uapi/linux/btrfs_tree.h index fc3c32186d7e..ca65d7b7a6ca 100644 --- a/include/uapi/linux/btrfs_tree.h +++ b/include/uapi/linux/btrfs_tree.h @@ -73,6 +73,9 @@ /* Holds the block group items for extent tree v2. */ #define BTRFS_BLOCK_GROUP_TREE_OBJECTID 11ULL +/* Tracks RAID stripes in block groups. */ +#define BTRFS_RAID_STRIPE_TREE_OBJECTID 12ULL + /* device stats in the device tree */ #define BTRFS_DEV_STATS_OBJECTID 0ULL @@ -261,6 +264,8 @@ #define BTRFS_DEV_ITEM_KEY 216 #define BTRFS_CHUNK_ITEM_KEY 228 +#define BTRFS_RAID_STRIPE_KEY 230 + /* * Records the overall state of the qgroups. * There's only one instance of this key present, @@ -719,6 +724,30 @@ struct btrfs_free_space_header { __le64 num_bitmaps; } __attribute__ ((__packed__)); +struct btrfs_raid_stride { + /* The id of device this raid extent lives on. */ + __le64 devid; + /* The physical location on disk. */ + __le64 physical; +} __attribute__ ((__packed__)); + +/* The stripe_extent::encoding, 1:1 mapping of enum btrfs_raid_types. */ +#define BTRFS_STRIPE_RAID0 1 +#define BTRFS_STRIPE_RAID1 2 +#define BTRFS_STRIPE_DUP 3 +#define BTRFS_STRIPE_RAID10 4 +#define BTRFS_STRIPE_RAID5 5 +#define BTRFS_STRIPE_RAID6 6 +#define BTRFS_STRIPE_RAID1C3 7 +#define BTRFS_STRIPE_RAID1C4 8 + +struct btrfs_stripe_extent { + __u8 encoding; + __u8 reserved[7]; + /* An array of raid strides this stripe is composed of. */ + struct btrfs_raid_stride strides[]; +} __attribute__ ((__packed__)); + #define BTRFS_HEADER_FLAG_WRITTEN (1ULL << 0) #define BTRFS_HEADER_FLAG_RELOC (1ULL << 1) |