Initial remote commit

misc_tools/investigate_translation.py

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