# Test Case: Readdir Cookies and seekdir Resume

**Test ID**: TC048-readdir-seek
**Category**: Directory Operations
**Priority**: Critical

## Objective

Verify every kernel d_off and libc telldir cookie resumes at the next exact
entry; complete second traversals are not substitutes.

## Procedure

Mount metadata/namei-base.erofs and run:

    ./readdir_probe /tmp/repo22-g3/mnt/wide 128 |
      tee TC048-probe.out

## Probe Contract

The helper fails on non-increasing cookies, invalid records, duplicate names,
kernel/libc order or type differences, a restart at the wrong next name, or a
final cookie that does not reach EOF. Kernel d_off values are validated after
reopen/lseek; each libc telldir value is passed back to seekdir on the same
DIR stream that produced it, as required by the API contract.

## Expected Results

The helper exits zero and reports entries=322, d_off_restarts=322,
seekdir_restarts=322, buffer=128, the type counts, and one FNV-1a name/type
hash. Record literal output and cleanup.