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+# Test Case: Large Directory
+
+**Test ID**: TC125-large-directory  
+**Category**: Boundary & Stress  
+**Priority**: High  
+**Regression**: None
+
+## Objective
+
+Verify exact readdir and lookup behavior for one directory containing 12,000
+direct child files. Record scan timing without a cross-machine time gate.
+
+## Preconditions
+
+- Complete `G7-MANUAL-SETUP.md` and verify the source inventory.
+
+## Manual Steps
+
+```sh
+G7=/root/repo22-g7
+FIX=$G7/fixtures
+SRCROOT=$FIX/sources/boundaries
+IMAGE=$FIX/images/boundaries.erofs
+MNT=/mnt/repo22-g7-tc125
+E=$G7/evidence/TC125
+mkdir -p "$MNT" "$E"
+unit=$(mdconfig -a -t vnode -f "$IMAGE")
+mount -t erofs -o ro "/dev/$unit" "$MNT"
+(cd "$SRCROOT" && find large-dir -type f -print | sort) > "$E/source.names"
+/usr/bin/time -p sh -c \
+  'cd "$1" && find large-dir -type f -print | sort > "$2"' \
+  sh "$MNT" "$E/target.names" 2> "$E/readdir.time"
+cat "$E/readdir.time"
+source_count=$(wc -l < "$E/source.names" | tr -d ' ')
+target_count=$(wc -l < "$E/target.names" | tr -d ' ')
+printf 'source_count=%s\ntarget_count=%s\n' "$source_count" "$target_count" \
+  | tee "$E/counts.txt"
+test "$source_count" -eq 12000
+test "$target_count" -eq 12000
+cmp "$E/source.names" "$E/target.names"
+for name in entry-00000.txt entry-00001.txt entry-05999.txt \
+  entry-11998.txt entry-11999.txt; do
+  cmp "$SRCROOT/large-dir/$name" "$MNT/large-dir/$name"
+  printf '%s source=%s target=%s\n' "$name" \
+    "$(sha256 -q "$SRCROOT/large-dir/$name")" \
+    "$(sha256 -q "$MNT/large-dir/$name")"
+done | tee "$E/lookups.txt"
+(cd "$SRCROOT" && find large-dir -type f -exec sha256sum {} + | sort) \
+  > "$E/source.hashes"
+(cd "$MNT" && find large-dir -type f -exec sha256sum {} + | sort) \
+  > "$E/target.hashes"
+cmp "$E/source.hashes" "$E/target.hashes"
+umount "$MNT"
+mdconfig -d -u "${unit#md}"
+test -z "$(mount -p | awk -v m="$MNT" '$2 == m { print }')"
+test -z "$(mdconfig -l | tr ' ' '\n' | grep -x "$unit")"
+```
+
+## PASS Gate
+
+- Exact sorted names and all 12,000 source/mount hashes match.
+- The five boundary/middle lookups match their sources.
+- Readdir timing is recorded but has no fixed TCG or cross-machine limit.
+- No readdir error, panic, hang, or cleanup leak occurs.