erofs-freebsd-out-tree/tests/TC063-setattr-write-reject.md

Test Case: Write, Truncate, and Create Rejection

Test ID: TC063-setattr-write-reject Category: Read-Only Enforcement Priority: Critical

Objective

Verify direct open-for-write, truncate, and create requests return EROFS and leave the mounted tree unchanged.

Procedure

Mount vfs/vfs-plain.erofs and run:

sha256 /tmp/repo22-g3/mnt/testdir/file.txt > TC063-before.txt
./g3_vfs_probe expect-error open-rdwr \
  /tmp/repo22-g3/mnt/testdir/file.txt 30
./g3_vfs_probe expect-error truncate \
  /tmp/repo22-g3/mnt/testdir/file.txt 30
./g3_vfs_probe expect-error create \
  /tmp/repo22-g3/mnt/testdir/newfile.txt 30
sha256 /tmp/repo22-g3/mnt/testdir/file.txt > TC063-after.txt
cmp TC063-before.txt TC063-after.txt
test ! -e /tmp/repo22-g3/mnt/testdir/newfile.txt

Expected Results

All mutation syscalls report errno 30, the file hash is unchanged, and no new entry exists. Record output and cleanup.