| #! /bin/bash |
| # SPDX-License-Identifier: GPL-2.0 |
| # Copyright (c) 2017 Red Hat. All Rights Reserved. |
| # |
| # FS QA Test 462 |
| # |
| # This is a regression test for kernel commit |
| # ef947b2 x86, mm: fix gup_pte_range() vs DAX mappings |
| # created by Jeffrey Moyer <jmoyer@redhat.com> |
| # |
| # This is reproducible only when testing on pmem device |
| # which is configured in "memory mode", not in "raw mode". |
| # |
| . ./common/preamble |
| _begin_fstest auto quick dax |
| |
| # Import common functions. |
| . ./common/filter |
| |
| # Modify as appropriate. |
| _require_test |
| _require_scratch_dax_mountopt "dax" |
| _require_test_program "t_mmap_write_ro" |
| # running by unpriviliged user is not necessary to reproduce |
| # this bug, just trying to test more. |
| _require_user |
| |
| |
| _scratch_mkfs >>$seqres.full 2>&1 |
| _scratch_mount "-o dax" |
| |
| # remount TEST_DEV wo/ dax |
| export TEST_FS_MOUNT_OPTS="" |
| _test_cycle_mount |
| |
| # prepare a 4k read-only DAX file, save its md5sum |
| $XFS_IO_PROG -f -c "pwrite -S 0xFF 0 4096" \ |
| $SCRATCH_MNT/readonlyfile >> $seqres.full 2>&1 |
| chmod 0644 $SCRATCH_MNT/readonlyfile |
| md5_1="$(_md5_checksum $SCRATCH_MNT/readonlyfile)" |
| |
| # prepare another 4k non-DAX file |
| $XFS_IO_PROG -f -c "pwrite -S 0x00 0 4096" \ |
| $TEST_DIR/${seq}.file >> $seqres.full 2>&1 |
| |
| # allow qa_user access |
| chown $qa_user $TEST_DIR/${seq}.file |
| |
| # run test programme, read another file writing into |
| # the read-only file with mmap, which should fail. |
| # |
| # don't use $here/src/t_mmap_write_ro, as we're running it as a regular user, |
| # and $here may contain path component that a regular user doesn't have search |
| # permission |
| _user_do "src/t_mmap_write_ro $TEST_DIR/${seq}.file \ |
| $SCRATCH_MNT/readonlyfile" |
| |
| # read-only file should not get updated, md5sum again. |
| md5_2="$(_md5_checksum $SCRATCH_MNT/readonlyfile)" |
| |
| [ "$md5_1" != "$md5_2" ] && echo "read only file changed" |
| |
| # success, all done |
| status=0 |
| exit |
