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btrfs: add raid stripe tree definitions

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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>
This commit is contained in:
Johannes Thumshirn
2023-09-14 09:06:56 -07:00
committed by David Sterba
parent 6d3a61945b
commit ee1293308e
3 changed files with 38 additions and 0 deletions
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29
include/uapi/linux/btrfs_tree.h
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@@ -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)