56 lines
2.0 KiB
Scheme
56 lines
2.0 KiB
Scheme
(library
|
|
(thin metadata)
|
|
|
|
(export ThinSuperblock
|
|
ThinDeviceDetails)
|
|
|
|
(import (chezscheme)
|
|
(bcache block-manager)
|
|
(persistent-data btree))
|
|
|
|
(define $superblock-magic 27022010)
|
|
(define $superblock-salt 160774)
|
|
(define $uuid-size 16)
|
|
(define $space-map-root-size 128)
|
|
|
|
(define-compound-value-type device-details-vt ThinDeviceDetails)
|
|
|
|
(define (block->superblock b)
|
|
(make-ftype-pointer ThinSuperblock (block-data b)))
|
|
|
|
(define-ftype ThinSuperblock
|
|
(packed
|
|
(endian little
|
|
(struct
|
|
(csum unsigned-32)
|
|
(flags unsigned-32)
|
|
(block-nr unsigned-64)
|
|
(uuid (array 16 unsigned-8))
|
|
(magic unsigned-64)
|
|
(version unsigned-32)
|
|
(time unsigned-32)
|
|
(trans-id unsigned-64)
|
|
(metadata-snap unsigned-64)
|
|
(data-space-map-root (array 128 unsigned-8))
|
|
(metadata-space-map-root (array 128 unsigned-8))
|
|
(data-mapping-root unsigned-64)
|
|
(device-details-root unsigned-64)
|
|
(data-block-size unsigned-32)
|
|
(metadata-block-size unsigned-32)
|
|
(metadata-nr-blocks unsigned-64)
|
|
(compat-flags unsigned-32)
|
|
(compat-ro-flags unsigned-32)
|
|
(incompat-flags unsigned-32)))))
|
|
|
|
(define-ftype ThinDeviceDetails
|
|
(packed
|
|
(endian little
|
|
(struct
|
|
(mapped-blocks unsigned-64)
|
|
(transaction-id unsigned-64)
|
|
(creation-time unsigned-32)
|
|
(snapshotted-time unsigned-32)))))
|
|
|
|
)
|
|
|