| #! /bin/bash |
| # SPDX-License-Identifier: GPL-2.0 |
| # |
| # FS QA Test No. 658 |
| # |
| # Ensuring that copy on write in mmap mode works when the CoW |
| # range originally covers multiple extents, some regular, some not. |
| # (MMAP version of generic/197,196) |
| # - Create two files. |
| # - Reflink the odd blocks of the first file into the second file. |
| # - mmap CoW across the halfway mark, starting with the unwritten extent. |
| # - Check that the files are now different where we say they're different. |
| # |
| . ./common/preamble |
| _begin_fstest auto quick clone prealloc mmap |
| |
| # Import common functions. |
| . ./common/filter |
| . ./common/reflink |
| |
| _require_scratch_reflink |
| _require_xfs_io_command "falloc" |
| |
| echo "Format and mount" |
| _scratch_mkfs > $seqres.full 2>&1 |
| _scratch_mount >> $seqres.full 2>&1 |
| |
| testdir=$SCRATCH_MNT/test-$seq |
| mkdir $testdir |
| |
| echo "Create the original files" |
| blksz=65536 |
| nr=64 |
| filesize=$((blksz * nr)) |
| _weave_reflink_regular $blksz $nr $testdir/file1 $testdir/file3 >> $seqres.full |
| _scratch_cycle_mount |
| |
| echo "Compare files" |
| md5sum $testdir/file1 | _filter_scratch |
| md5sum $testdir/file3 | _filter_scratch |
| md5sum $testdir/file3.chk | _filter_scratch |
| |
| echo "mmap CoW across the transition" |
| cowoff=$((filesize / 4)) |
| cowsz=$((filesize / 2)) |
| mmapsz=$((cowoff + cowsz)) |
| _mwrite_byte 0x63 $cowoff $cowsz $mmapsz $testdir/file3 >> $seqres.full |
| _mwrite_byte 0x63 $cowoff $cowsz $mmapsz $testdir/file3.chk >> $seqres.full |
| _scratch_cycle_mount |
| |
| echo "Compare files" |
| md5sum $testdir/file1 | _filter_scratch |
| md5sum $testdir/file3 | _filter_scratch |
| md5sum $testdir/file3.chk | _filter_scratch |
| |
| # success, all done |
| status=0 |
| exit |
