forked from Imagelibrary/littlefs
e5cd2904ee
Changed always-follow alts that we use to terminated grow/shrink/remove operations to use `altle 0xfff0` instead of `altgt 0`. `altgt 0` gets the job done as long as you make sure tag 0 never ends up in an rbyd query. But this kept showing up as a problem, and recent debugging revealed some erronous 0 tag lookups created vestigial alt pointers (not necessarily a problem, but space-wasting). Since we moved to a strict 16-bit tag, making these `altle 0xfff0` doesn't really have a downside, and means we can expect rbyd lookups around 0 to behave how one would normally expect. As a (very minor) plus, the value zero usually has special encodings in instruction sets, so being able to use it for rbyd_lookups offers a (very minor) code size saving. --- Sidenote: The reasons altle/altgt is how it is and asymmetric: 1. Flipping these alts is a single bit-flip, which only happens if they are asymmetric (only one includes the equal case). 2. Our branches are biased to prefer the larger tag. This makes traversal trivial. It might be possible to make this still work with altlt/altge, but would require some increments/decrements, which might cause problems with boundary conditions around the 16-bit tag limit.
655 lines
23 KiB
Python
Executable File
655 lines
23 KiB
Python
Executable File
#!/usr/bin/env python3
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import bisect
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import itertools as it
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import math as m
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import os
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import struct
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TAG_UNREACHABLE = 0x0002
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TAG_NAME = 0x1000
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TAG_BNAME = 0x1000
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TAG_REG = 0x1010
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TAG_DIR = 0x1020
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TAG_STRUCT = 0x3000
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TAG_INLINED = 0x3000
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TAG_BLOCK = 0x3100
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TAG_BRANCH = 0x3200
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TAG_BTREE = 0x3300
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TAG_UATTR = 0x4000
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TAG_ALT = 0x0008
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TAG_CRC = 0x0004
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TAG_FCRC = 0x1004
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def blocklim(s):
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if '.' in s:
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s = s.strip()
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b = 10
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if s.startswith('0x') or s.startswith('0X'):
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s = s[2:]
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b = 16
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elif s.startswith('0o') or s.startswith('0O'):
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s = s[2:]
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b = 8
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elif s.startswith('0b') or s.startswith('0B'):
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s = s[2:]
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b = 2
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s0, s1 = s.split('.', 1)
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return int(s0, b), int(s1, b)
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else:
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return int(s, 0)
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def crc32c(data, crc=0):
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crc ^= 0xffffffff
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for b in data:
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crc ^= b
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for j in range(8):
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crc = (crc >> 1) ^ ((crc & 1) * 0x82f63b78)
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return 0xffffffff ^ crc
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def fromle16(data):
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if len(data) < 2:
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return 0
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return struct.unpack('<H', data[:2])[0]
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def fromleb128(data):
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word = 0
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for i, b in enumerate(data):
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word |= ((b & 0x7f) << 7*i)
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word &= 0xffffffff
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if not b & 0x80:
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return word, i+1
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return word, len(data)
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def fromtag(data):
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tag = fromle16(data)
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id, delta = fromleb128(data[2:])
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size, delta_ = fromleb128(data[2+delta:])
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return tag&1, tag&~1, id if tag&0x8 else id-1, size, 2+delta+delta_
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def popc(x):
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return bin(x).count('1')
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def xxd(data, width=16, crc=False):
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for i in range(0, len(data), width):
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yield '%-*s %-*s' % (
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3*width,
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' '.join('%02x' % b for b in data[i:i+width]),
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width,
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''.join(
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b if b >= ' ' and b <= '~' else '.'
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for b in map(chr, data[i:i+width])))
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def tagrepr(tag, id, size, off=None):
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if (tag & 0xfffe) == TAG_UNREACHABLE:
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return 'unreachable id%d%s' % (
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id,
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' %d' % size if size else '')
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elif (tag & 0xf00c) == TAG_NAME:
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return '%s%s id%d %d' % (
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'rm' if tag & 0x2 else '',
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'bname' if (tag & 0xfffe) == TAG_BNAME
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else 'reg' if (tag & 0xfffe) == TAG_REG
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else 'dir' if (tag & 0xfffe) == TAG_DIR
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else 'name 0x%02x' % ((tag & 0x0ff0) >> 4),
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id,
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size)
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elif (tag & 0xf00c) == TAG_STRUCT:
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return '%s%s id%d %d' % (
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'rm' if tag & 0x2 else '',
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'inlined' if (tag & 0xfffe) == TAG_INLINED
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else 'block' if (tag & 0xfffe) == TAG_BLOCK
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else 'branch' if (tag & 0xfffe) == TAG_BRANCH
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else 'btree' if (tag & 0xfffe) == TAG_BTREE
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else 'struct 0x%02x' % ((tag & 0x0ff0) >> 4),
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id,
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size)
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elif (tag & 0xf00c) == TAG_UATTR:
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return '%suattr 0x%02x%s%s' % (
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'rm' if tag & 0x2 else '',
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(tag & 0x0ff0) >> 4,
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' id%d' % id if id != -1 else '',
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' %d' % size if not tag & 0x2 or size else '')
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elif (tag & 0xf00e) == TAG_CRC:
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return 'crc%x%s %d' % (
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1 if tag & 0x10 else 0,
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' 0x%02x' % id if id != -1 else '',
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size)
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elif (tag & 0xfffe) == TAG_FCRC:
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return 'fcrc%s %d' % (
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' 0x%02x' % id if id != -1 else '',
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size)
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elif tag & 0x8:
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return 'alt%s%s 0x%x w%d %s' % (
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'r' if tag & 0x2 else 'b',
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'gt' if tag & 0x4 else 'le',
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tag & 0xfff0,
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id,
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'0x%x' % (0xffffffff & (off-size))
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if off is not None
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else '-%d' % off)
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else:
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return '0x%04x id%d %d' % (tag, id, size)
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class Rbyd:
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def __init__(self, block, limit, data, rev, off, trunk, weight):
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self.block = block
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self.limit = limit
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self.data = data
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self.rev = rev
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self.off = off
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self.trunk = trunk
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self.weight = weight
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@classmethod
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def fetch(cls, f, block_size, block, limit):
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# seek to the block
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f.seek(block * block_size)
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data = f.read(limit)
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# fetch the rbyd
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rev, = struct.unpack('<I', data[0:4].ljust(4, b'\0'))
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crc = crc32c(data[0:4])
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off = 0
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j_ = 4
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trunk = None
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trunk_ = None
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weight = 0
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lower_, upper_ = 0, 0
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weight_ = 0
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wastrunk = False
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while j_ < limit:
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v, tag, id, size, delta = fromtag(data[j_:])
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if v != (popc(crc) & 1):
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break
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crc = crc32c(data[j_:j_+delta], crc)
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j_ += delta
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# find trunk
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if not wastrunk and (tag & 0xc) != 0x4:
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trunk_ = j_ - delta
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lower_, upper_ = 0, 0
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wastrunk = not not tag & 0x8
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# keep track of weight
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if tag & 0x8:
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if tag & 0x4:
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upper_ += id
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else:
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lower_ += id
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elif (tag & 0xc) == 0x0:
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weight_ = lower_+upper_
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if not tag & 0x2:
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weight_ += id+1-lower_
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# take care of crcs
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if not tag & 0x8:
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if (tag & 0xf00f) != TAG_CRC:
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crc = crc32c(data[j_:j_+size], crc)
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# found a crc?
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else:
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crc_, = struct.unpack('<I', data[j_:j_+4].ljust(4, b'\0'))
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if crc != crc_:
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break
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# commit what we have
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off = j_ + size
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trunk = trunk_
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weight = weight_
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j_ += size
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return Rbyd(block, limit, data, rev, off, trunk, weight)
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def lookup(self, tag, id):
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if not self:
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return True, 0, -1, 0, 0, 0, b''
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lower = -1
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upper = self.weight
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# descend down tree
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j = self.trunk
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while True:
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_, alt, weight_, jump, delta = fromtag(self.data[j:])
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# found an alt?
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if alt & 0x8:
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# follow?
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if ((id, tag & ~0xf) > (upper-weight_-1, alt & ~0xf)
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if alt & 0x4
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else ((id, tag & ~0xf) <= (lower+weight_, alt & ~0xf))):
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lower += upper-lower-1-weight_ if alt & 0x4 else 0
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upper -= upper-lower-1-weight_ if not alt & 0x4 else 0
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j = j - jump
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# stay on path
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else:
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lower += weight_ if not alt & 0x4 else 0
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upper -= weight_ if alt & 0x4 else 0
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j = j + delta
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# found tag
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else:
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tag_ = alt
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id_ = upper-1
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w_ = id_-lower
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done = (id_, tag_) < (id, tag) or tag_ & 2
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return (done, tag_, id_, w_,
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j, delta, self.data[j+delta:j+delta+jump])
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def __bool__(self):
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return self.trunk is not None
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def __eq__(self, other):
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return self.block == other.block and self.limit == other.limit
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def __ne__(self, other):
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return not self.__eq__(other)
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def __iter__(self):
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tag = 0
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id = 0
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while True:
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done, tag, id, w, j, d, data = self.lookup(tag+0x10, id)
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if done:
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break
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yield tag, id, w, j, d, data
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def main(disk, block_size=None, trunk=0, limit=None, *,
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color='auto',
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**args):
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# figure out what color should be
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if color == 'auto':
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color = sys.stdout.isatty()
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elif color == 'always':
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color = True
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else:
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color = False
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# trunk may include a limit
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if isinstance(trunk, tuple):
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if limit is None:
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limit = trunk[1]
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trunk = trunk[0]
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# we seek around a bunch, so just keep the disk open
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with open(disk, 'rb') as f:
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# if block_size is omitted, assume the block device is one big block
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if block_size is None:
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f.seek(0, os.SEEK_END)
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block_size = f.tell()
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# default limit to the block_size
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if limit is None:
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limit = block_size
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# fetch the trunk
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trunk = Rbyd.fetch(f, block_size, trunk, limit)
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print('btree 0x%x.%x, rev %d, weight %d' % (
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trunk.block, trunk.limit, trunk.rev, trunk.weight))
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# look up an id, while keeping track of the search path
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def lookup(id, depth=None):
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rbyd = trunk
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rid = id
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depth_ = 1
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path = []
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# corrupted? return a corrupted block once
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if not rbyd:
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return (id > 0, id, 0, rbyd, -1, 0,
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0, 0, b'',
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0, 0, b'',
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path)
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while True:
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# first lookup id/name
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(done, name_tag, rid_, w,
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name_j, name_d, name) = rbyd.lookup(0, rid)
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if done:
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return (True, id, 0, rbyd, -1, 0,
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0, 0, b'',
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0, 0, b'',
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path)
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if name_tag & 0xf00f == TAG_NAME:
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# then lookup struct
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(done, tag, _, _,
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struct_j, struct_d, struct_) = rbyd.lookup(
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TAG_STRUCT, rid_)
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if done:
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return (True, id, 0, rbyd, -1, 0,
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0, 0, b'',
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0, 0, b'',
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path)
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else:
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tag = name_tag
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struct_j, struct_d, struct_ = name_j, name_d, name
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name_j, name_d, name = name_j, 0, b''
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path.append((id + (rid_-rid), w, rbyd, rid_, tag,
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name_j, name_d, name,
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struct_j, struct_d, struct_))
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# is it another branch? continue down tree
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if tag == TAG_BRANCH and (depth is None or depth_ < depth):
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block, delta = fromleb128(struct_)
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limit, _ = fromleb128(struct_[delta:])
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rbyd = Rbyd.fetch(f, block_size, block, limit)
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# corrupted? bail here so we can keep traversing the tree
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if not rbyd:
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return (False, id + (rid_-rid), w, rbyd, -1, 0,
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0, 0, b'',
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0, 0, b'',
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path)
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rid -= (rid_-(w-1))
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depth_ += 1
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else:
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return (False, id + (rid_-rid), w, rbyd, rid_, tag,
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name_j, name_d, name,
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struct_j, struct_d, struct_,
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path)
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# if we're printing the tree, first find the max depth so we know how
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# much space to reserve
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t_width = 0
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if args.get('tree'):
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t_depth = 0
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id = -1
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while True:
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(done, id, w, rbyd, rid, tag,
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name_j, name_d, name,
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struct_j, struct_d, struct_,
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path) = (lookup(id+1, depth=args.get('depth')))
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if done:
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break
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t_depth = max(t_depth, len(path))
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t_width = 2*t_depth+2 if t_depth > 0 else 0
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t_branches = [(0, trunk.weight)]
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def t_repr(id, w, d=None):
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branches_ = []
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for i in range(len(t_branches)):
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if d is not None and d == i-1:
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branches_.append('+')
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elif i+1 < len(t_branches):
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if (id-(w-1) == t_branches[i+1][0]
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and t_branches[i][0] == t_branches[i+1][0]
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and (not args.get('inner')
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or (i == 0 and d == 0))):
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branches_.append('+-')
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elif (id-(w-1) == t_branches[i+1][0]
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and t_branches[i][1] == t_branches[i+1][1]
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and (not args.get('inner') or d == i)):
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branches_.append('\'-')
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elif (id-(w-1) == t_branches[i+1][0]
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and (not args.get('inner') or d == i)):
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branches_.append('|-')
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elif (id-(w-1) >= t_branches[i][0]
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and id-(w-1) < t_branches[i][1]
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and t_branches[i][1] != t_branches[i+1][1]):
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branches_.append('| ')
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else:
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branches_.append(' ')
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else:
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if (id-(w-1) == t_branches[i][0]
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and (not args.get('inner') or i == 0)):
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branches_.append('+-%s> ' % ('-'*2*(t_depth-i-1)))
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elif id == t_branches[i][1]-1:
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branches_.append('\'-%s> ' % ('-'*2*(t_depth-i-1)))
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elif (id >= t_branches[i][0]
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and id-(w-1) < t_branches[i][1]):
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branches_.append('|-%s> ' % ('-'*2*(t_depth-i-1)))
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return '%s%-*s%s' % (
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'\x1b[90m' if color else '',
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t_width, ''.join(branches_),
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'\x1b[m' if color else '')
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# print header
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w_width = 2*m.ceil(m.log10(max(1, trunk.weight)+1))+1
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print('%-9s %*s%-*s %-8s %-22s %s' % (
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'block',
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t_width, '',
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w_width, 'ids',
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'name',
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'tag',
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'data (truncated)'
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if not args.get('no_truncate') else ''))
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# traverse and print entries
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id = -1
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prbyd = None
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ppath = []
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corrupted = False
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while True:
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(done, id, w, rbyd, rid, tag,
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name_j, name_d, name,
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struct_j, struct_d, struct_,
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path) = (lookup(id+1, depth=args.get('depth')))
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if done:
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break
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if args.get('inner') or args.get('tree'):
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t_branches = [(0, trunk.weight)]
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changed = False
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for i, (x, px) in enumerate(
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it.zip_longest(path[:-1], ppath[:-1])):
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if x is None:
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break
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(id_, w_, rbyd_, rid_, tag_,
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name_j_, name_d_, name_,
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struct_j_, struct_d_, struct__) = x
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t_branches.append((id_-(w_-1), id_+1))
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if args.get('inner'):
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if not (changed or px is None or x != px):
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continue
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changed = True
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# show human-readable representation
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print('%10s %s%*s %-8s %-22s %s' % (
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'%04x.%04x:' % (rbyd_.block, rbyd_.limit)
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if prbyd is None or rbyd_ != prbyd
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else '',
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t_repr(id_, w_, i) if args.get('tree') else '',
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w_width, '%d-%d' % (id_-(w_-1), id_)
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if w_ > 1 else id_
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if w_ > 0 else '',
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''.join(
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b if b >= ' ' and b <= '~' else '.'
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for b in map(chr, name_)),
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tagrepr(tag_, rid_, len(struct__), None),
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next(xxd(struct__, 8), '')
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if not args.get('no_truncate') else ''))
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# show in-device representation
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if args.get('device'):
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print('%9s %*s%*s %8s %-22s%s' % (
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'',
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t_width, '',
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w_width, '',
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'',
|
|
'%04x %08x %07x' % (
|
|
tag_, 0xffffffff & rid_, len(struct__)),
|
|
' %s' % ' '.join(
|
|
'%08x' % struct.unpack('<I',
|
|
rbyd_.data[struct_j_+struct_d_+i*4
|
|
: struct_j_+struct_d_
|
|
+ min(i*4+4,len(struct__))]
|
|
.ljust(4, b'\0'))
|
|
for i in range(
|
|
min(m.ceil(len(struct__)/4), 3)))[:23]))
|
|
|
|
# show on-disk encoding of tags/data
|
|
for j, d, data in [
|
|
(name_j_, name_d_, name_),
|
|
(struct_j_, struct_d_, struct__)]:
|
|
if args.get('raw'):
|
|
for o, line in enumerate(
|
|
xxd(rbyd_.data[j:j+d])):
|
|
print('%9s: %s' % (
|
|
'%04x' % (j + o*16),
|
|
line))
|
|
|
|
# show on-disk encoding of tags
|
|
if args.get('raw') or args.get('no_truncate'):
|
|
for o, line in enumerate(xxd(data)):
|
|
print('%9s: %s' % (
|
|
'%04x' % (j+d + o*16),
|
|
line))
|
|
|
|
# prbyd here means the last rendered rbyd, we update
|
|
# here to always print interleaved addresses
|
|
prbyd = rbyd_
|
|
|
|
# corrupted? try to keep printing the tree
|
|
if not rbyd:
|
|
print('%04x.%04x: %s%s%s%s' % (
|
|
rbyd.block, rbyd.limit,
|
|
t_repr(id, w) if args.get('tree') else '',
|
|
'\x1b[31m' if color else '',
|
|
'(corrupted rbyd 0x%x.%x)' % (rbyd.block, rbyd.limit),
|
|
'\x1b[m' if color else ''))
|
|
|
|
prbyd = rbyd
|
|
ppath = path
|
|
corrupted = True
|
|
continue
|
|
|
|
# if we're not showing inner nodes, prefer names higher in the tree
|
|
# since this avoids showing vestigial names
|
|
if not args.get('inner'):
|
|
for (id_, w_, rbyd_, rid_, tag_,
|
|
name_j_, name_d_, name_,
|
|
struct_j_, struct_d_, struct__) in reversed(path):
|
|
name_j, name_d, name = name_j_, name_d_, name_
|
|
if rid_-(w_-1) != 0:
|
|
break
|
|
|
|
# show human-readable representation
|
|
print('%10s %s%*s %-8s %-22s %s' % (
|
|
'%04x.%04x:' % (rbyd.block, rbyd.limit)
|
|
if prbyd is None or rbyd != prbyd
|
|
else '',
|
|
t_repr(id, w) if args.get('tree') else '',
|
|
w_width, '%d-%d' % (id-(w-1), id)
|
|
if w > 1 else id
|
|
if w > 0 else '',
|
|
''.join(
|
|
b if b >= ' ' and b <= '~' else '.'
|
|
for b in map(chr, name)),
|
|
tagrepr(tag, rid, len(struct_), None),
|
|
next(xxd(struct_, 8), '')
|
|
if not args.get('no_truncate') else ''))
|
|
|
|
# show in-device representation
|
|
if args.get('device'):
|
|
print('%9s %*s%*s %8s %-22s%s' % (
|
|
'',
|
|
t_width, '',
|
|
w_width, '',
|
|
'',
|
|
'%04x %08x %07x' % (
|
|
tag, 0xffffffff & rid, len(struct_)),
|
|
' %s' % ' '.join(
|
|
'%08x' % struct.unpack('<I',
|
|
rbyd.data[struct_j+struct_d+i*4
|
|
: struct_j+struct_d
|
|
+ min(i*4+4,len(struct_))]
|
|
.ljust(4, b'\0'))
|
|
for i in range(
|
|
min(m.ceil(len(struct_)/4), 3)))[:23]))
|
|
|
|
# show on-disk encoding of tags/data
|
|
for j, d, data in [
|
|
(name_j, name_d, name),
|
|
(struct_j, struct_d, struct_)]:
|
|
if args.get('raw'):
|
|
for o, line in enumerate(xxd(rbyd.data[j:j+d])):
|
|
print('%9s: %s' % (
|
|
'%04x' % (j + o*16),
|
|
line))
|
|
|
|
# show on-disk encoding of tags
|
|
if args.get('raw') or args.get('no_truncate'):
|
|
for o, line in enumerate(xxd(data)):
|
|
print('%9s: %s' % (
|
|
'%04x' % (j+d + o*16),
|
|
line))
|
|
|
|
prbyd = rbyd
|
|
ppath = path
|
|
|
|
if args.get('error_on_corrupt') and corrupted:
|
|
sys.exit(2)
|
|
|
|
|
|
if __name__ == "__main__":
|
|
import argparse
|
|
import sys
|
|
parser = argparse.ArgumentParser(
|
|
description="Debug rbyd B-trees.",
|
|
allow_abbrev=False)
|
|
parser.add_argument(
|
|
'disk',
|
|
help="File containing the block device.")
|
|
parser.add_argument(
|
|
'trunk',
|
|
nargs='?',
|
|
type=blocklim,
|
|
help="Block address of the trunk of the tree.")
|
|
parser.add_argument(
|
|
'-B', '--block-size',
|
|
type=lambda x: int(x, 0),
|
|
help="Block size in bytes.")
|
|
parser.add_argument(
|
|
'-L', '--limit',
|
|
type=lambda x: int(x, 0),
|
|
help="Rbyd limit of the trunk of the tree (alias).")
|
|
parser.add_argument(
|
|
'--color',
|
|
choices=['never', 'always', 'auto'],
|
|
default='auto',
|
|
help="When to use terminal colors. Defaults to 'auto'.")
|
|
parser.add_argument(
|
|
'-r', '--raw',
|
|
action='store_true',
|
|
help="Show the raw data including tag encodings.")
|
|
parser.add_argument(
|
|
'-x', '--device',
|
|
action='store_true',
|
|
help="Show the device-side representation of tags.")
|
|
parser.add_argument(
|
|
'-T', '--no-truncate',
|
|
action='store_true',
|
|
help="Don't truncate, show the full contents.")
|
|
parser.add_argument(
|
|
'-i', '--inner',
|
|
action='store_true',
|
|
help="Show inner branches.")
|
|
parser.add_argument(
|
|
'-t', '--tree',
|
|
action='store_true',
|
|
help="Show the underlying B-tree.")
|
|
parser.add_argument(
|
|
'-Z', '--depth',
|
|
type=lambda x: int(x, 0),
|
|
help="Depth of tree to show.")
|
|
parser.add_argument(
|
|
'-e', '--error-on-corrupt',
|
|
action='store_true',
|
|
help="Error if B-tree is corrupt.")
|
|
sys.exit(main(**{k: v
|
|
for k, v in vars(parser.parse_intermixed_args()).items()
|
|
if v is not None}))
|