Initial remote commit

2026-04-30 11:04:05 +00:00
commit b86e4f9a98
103 changed files with 262770 additions and 0 deletions
--- a/misc_tools/raw_test.py
+++ b/misc_tools/raw_test.py
@@ -0,0 +1,93 @@
+import struct
+
+CHUNK    = 128*512
+LV_START = 5120000*512
+BSIZE    = 4096
+IPG      = 8192
+
+def read_virt(virt_byte, length):
+    result = bytearray(length)
+    pos = virt_byte
+    remaining = length
+    with open('/dev/md0','rb') as f:
+        while remaining > 0:
+            group     = pos // (5*CHUNK)
+            in_group  = pos % (5*CHUNK)
+            chunk_idx = in_group // CHUNK
+            intra     = in_group % CHUNK
+            seg_len   = min(CHUNK-intra, remaining)
+            dst_off   = pos - virt_byte
+            if chunk_idx != 4:
+                phys = LV_START + group*4*CHUNK + chunk_idx*CHUNK + intra
+                f.seek(phys)
+                data = f.read(seg_len)
+                result[dst_off:dst_off+len(data)] = data
+            pos       += seg_len
+            remaining -= seg_len
+    return bytes(result)
+
+# Read GDT from md0
+print('Reading GDT from /dev/md0...')
+gdt_data = read_virt(BSIZE, 20*64)
+
+for g in range(20):
+    entry    = gdt_data[g*64:(g+1)*64]
+    it_lo    = struct.unpack_from('<I', entry,  8)[0]
+    it_hi    = struct.unpack_from('<I', entry, 40)[0]
+    it_block = (it_hi<<32)|it_lo
+    flags    = struct.unpack_from('<H', entry, 18)[0]
+    print(f'  Group {g:3d}: it_block={it_block:10d} '
+          f'formula={1070+g*512} '
+          f'match={it_block==1070+g*512} '
+          f'flags=0x{flags:04x}')
+
+# Read /var inode
+var_inode = 1310721
+var_group = (var_inode-1)//IPG
+var_idx   = (var_inode-1)%IPG
+print(f'\n/var inode {var_inode}: group={var_group} idx={var_idx}')
+
+gdt_entry = read_virt(BSIZE + var_group*64, 64)
+it_lo    = struct.unpack_from('<I', gdt_entry,  8)[0]
+it_hi    = struct.unpack_from('<I', gdt_entry, 40)[0]
+it_block = (it_hi<<32)|it_lo
+print(f'GDT it_block: {it_block}')
+
+inode_virt = it_block*BSIZE + var_idx*256
+inode_data = read_virt(inode_virt, 256)
+mode      = struct.unpack_from('<H', inode_data,  0)[0]
+size      = struct.unpack_from('<I', inode_data,  4)[0]
+links     = struct.unpack_from('<H', inode_data, 26)[0]
+mtime     = struct.unpack_from('<I', inode_data, 16)[0]
+ext_magic = struct.unpack_from('<H', inode_data, 40)[0]
+print(f'mode=0x{mode:04x} size={size} links={links} '
+      f'mtime={mtime} ext_magic=0x{ext_magic:04x}')
+print(f'Valid dir: {(mode&0xf000)==0x4000 and ext_magic==0xf30a}')
+
+# If valid, list directory contents
+if (mode&0xf000)==0x4000 and ext_magic==0xf30a:
+    print()
+    print('Directory contents:')
+    entries_raw = struct.unpack_from('<H', inode_data, 42)[0]
+    depth       = struct.unpack_from('<H', inode_data, 46)[0]
+    if depth == 0:
+        for i in range(min(entries_raw,4)):
+            off    = 52+i*12
+            ee_len = struct.unpack_from('<H', inode_data, off+4)[0]
+            ee_hi  = struct.unpack_from('<H', inode_data, off+6)[0]
+            ee_lo  = struct.unpack_from('<I', inode_data, off+8)[0]
+            blk    = (ee_hi<<32)|ee_lo
+            blk_data = read_virt(blk*BSIZE, BSIZE)
+            off2 = 0
+            while off2 < BSIZE-8:
+                ino     = struct.unpack_from('<I', blk_data, off2)[0]
+                rec_len = struct.unpack_from('<H', blk_data, off2+4)[0]
+                name_len= blk_data[off2+6]
+                ftype   = blk_data[off2+7]
+                if rec_len < 8: break
+                if ino > 0 and name_len > 0:
+                    name = blk_data[off2+8:off2+8+name_len].decode('utf-8',errors='replace')
+                    if name not in ('.','..'): 
+                        tname = {1:'file',2:'dir',7:'link'}.get(ftype,'?')
+                        print(f'  {tname:4s} inode={ino:10d} {name!r}')
+                off2 += rec_len