40 lines
1.4 KiB
Python
40 lines
1.4 KiB
Python
CHUNK = 128*512 # 65536 bytes
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BSIZE = 4096
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# Working blocks:
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# 9262 (root dir) -> chunk_idx=3, works
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# 6300141 (volumes) -> chunk_idx=3, works
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# 6299897 (ptero) -> chunk_idx=3, works
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# Failing block:
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# 5251104 (var) -> chunk_idx=4, fails
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# All working blocks have chunk_idx=3
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# The failing block has chunk_idx=4
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# What if the issue isn't our translation formula
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# but that block 5251104 was written when the filesystem
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# was mounted through the PERC, and the PERC stored it
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# in a way we can't access without the controller?
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# Let's find MORE blocks that work to see if chunk_idx matters:
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# Check the /boot, /home, /usr directories
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import subprocess, struct
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for path, inode in [('boot',2621441), ('home',2097153), ('usr',5505025),
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('etc',4456449), ('tmp',786433)]:
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r = subprocess.run(['istat','/dev/nbd0',str(inode)],
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capture_output=True, text=True)
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for line in r.stdout.splitlines():
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if 'Direct Blocks' in line:
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pass
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elif line.strip() and all(c.isdigit() or c==' ' for c in line.strip()):
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blocks = [int(x) for x in line.split() if x.strip()]
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for b in blocks:
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virt = b * BSIZE
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group = virt // (5*CHUNK)
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in_group = virt % (5*CHUNK)
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chunk_idx = in_group // CHUNK
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print(f'/{path} block={b} chunk_idx={chunk_idx}')
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