ddea2c0de7
This is the start of a tool that will analyse the block manager journal and spot any cases where we're not crash proof.
59 lines
1.4 KiB
Plaintext
59 lines
1.4 KiB
Plaintext
(import (chezscheme)
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(bcache block-manager)
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(fmt fmt)
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(loops)
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(persistent-data btree)
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(thin metadata))
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(define (noop k v)
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'nil)
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(define (mapping-top-level root)
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(btree-open le64-vt root))
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(define (mapping-bottom-level root)
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(btree-open le64-vt root))
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(define (mk-incrementer counts)
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(lambda (i)
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(vector-set! counts i (+ (vector-ref counts i) 1))))
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(define (bottom-level-walker cache inc-fn)
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(lambda (key root)
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(btree-each-and-count (mapping-bottom-level root) cache noop inc-fn)))
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(define (walk-top-level cache root counts)
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(let ((inc-fn (mk-incrementer counts)))
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(btree-each-and-count (mapping-top-level root)
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cache
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(bottom-level-walker cache inc-fn)
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inc-fn)))
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(define (calc-ref-counts md-path)
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(with-bcache (cache md-path (* 1 1024))
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(let ((counts (make-vector (get-nr-blocks cache) 0)))
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(with-block (b cache 0 (get-flags))
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(let ((sb (block->superblock b)))
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(walk-top-level cache
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(ftype-ref ThinSuperblock (data-mapping-root) sb)
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counts)))
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counts)))
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(define (print-counts counts)
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(upto (i (vector-length counts))
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(let ((rc (vector-ref counts i)))
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(when (> rc 0)
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(fmt #t i ": " (vector-ref counts i) nl)))))
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(define (usage)
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(fmt #t "Usage: thin-calc-ref-counts <binary metadata>" nl)
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(exit 1))
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(let ((args (cdr (command-line))))
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(if (not (= (length args) 1))
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(usage)
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(let ((counts (calc-ref-counts (car args))))
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(print-counts counts))))
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