import subprocess, struct

CHUNK    = 128*512
LV_START = 5120000*512
BSIZE    = 4096

# Check istat for volumes dir (inode 1585918) - we know fls works on this
r = subprocess.run(['istat', '/dev/nbd0', '1585918'],
                  capture_output=True, text=True)
print('istat for volumes (inode 1585918):')
print(r.stdout)

# Check istat for pterodactyl dir (inode 1574102)
r2 = subprocess.run(['istat', '/dev/nbd0', '1574102'],
                   capture_output=True, text=True)
print('istat for pterodactyl (inode 1574102):')
print(r2.stdout)

# Check which chunk each data block falls in
def check_block(block_num):
    virt = block_num * BSIZE
    group     = virt // (5*CHUNK)
    in_group  = virt % (5*CHUNK)
    chunk_idx = in_group // CHUNK
    return chunk_idx

# Parse direct blocks from istat output
for line in r.stdout.splitlines():
    if 'Direct Blocks' in line or (line.strip() and line.strip()[0].isdigit()):
        blocks = [int(x) for x in line.split() if x.isdigit()]
        for b in blocks:
            ci = check_block(b)
            print(f'  block {b}: chunk_idx={ci} {"METADATA" if ci==4 else "DATA"}')