Read quota directly

ttt.py

from collections import namedtuple
import struct 

Block = namedtuple('Block', 'next_free prev_free entries pad1 pad2')
Quota = namedtuple('Quota', 'id ihardlimit isoftlimit curinodes bhardlimit bsoftlimit curspace btime itime')

def read_quota(f):
        return Quota._make(struct.unpack('<IIIIIIQQQ', f.read(48)))

def report_block(f, i):
        f.seek(1024 * i)
        block = Block._make(struct.unpack('<IIHHI', f.read(16)))
        for i in xrange(0, block.entries):
                print read_quota(f)

def read_block(f, i):
        f.seek(1024 * i)
        return struct.unpack('<' + 'I' * 256, f.read(1024))

def report_tree(f, blk, depth, visited = set()):
        block = read_block(f, blk)
        if depth == 3:
                for i in xrange(0, 256):
                        if block[i] != 0 and block[i] not in visited:
                                report_block(f, block[i])
                                visited.add(block[i])
        else:
                for i in xrange(0, 256):
                        if block[i] != 0:
                                report_tree(f, block[i], depth + 1, visited)


with open('/home/aquota.user', 'rb') as f:
        report_tree(f, 1, 0)