| #! /bin/bash |
| # SPDX-License-Identifier: GPL-2.0 |
| # |
| # FS QA Test No. 657 |
| # |
| # Ensuring that copy on write in mmap mode works when the CoW |
| # range originally covers multiple extents. (MMAP version of generic/185,183) |
| # - Create two files |
| # - Reflink the odd blocks of the first file into a third file. |
| # - Reflink the even blocks of the second file into the third file. |
| # - mmap CoW across the halfway mark. |
| # - Check that the files are now different where we say they're different. |
| # |
| . ./common/preamble |
| _begin_fstest auto quick clone |
| |
| # Import common functions. |
| . ./common/filter |
| . ./common/reflink |
| |
| # real QA test starts here |
| _require_scratch_reflink |
| |
| 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)) |
| _pwrite_byte 0x61 0 $filesize $testdir/file1 >> $seqres.full |
| _pwrite_byte 0x62 0 $filesize $testdir/file2 >> $seqres.full |
| seq 0 2 $((nr-1)) | while read f; do |
| _reflink_range $testdir/file1 $((blksz * f)) $testdir/file3 $((blksz * f)) $blksz >> $seqres.full |
| _pwrite_byte 0x61 $((blksz * f)) $blksz $testdir/file3.chk >> $seqres.full |
| done |
| seq 1 2 $((nr-1)) | while read f; do |
| _reflink_range $testdir/file2 $((blksz * f)) $testdir/file3 $((blksz * f)) $blksz >> $seqres.full |
| _pwrite_byte 0x62 $((blksz * f)) $blksz $testdir/file3.chk >> $seqres.full |
| done |
| _scratch_cycle_mount |
| |
| echo "Compare files" |
| md5sum $testdir/file1 | _filter_scratch |
| md5sum $testdir/file2 | _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/file2 | _filter_scratch |
| md5sum $testdir/file3 | _filter_scratch |
| md5sum $testdir/file3.chk | _filter_scratch |
| |
| # success, all done |
| status=0 |
| exit |
