| #! /bin/bash |
| # SPDX-License-Identifier: GPL-2.0 |
| # Copyright (c) 2016, Oracle and/or its affiliates. All Rights Reserved. |
| # |
| # FS QA Test No. 221 |
| # |
| # Ensuring that copy on write in buffered mode works when the CoW |
| # range originally covers multiple extents, some holes, some not. |
| # - Set cowextsize hint. |
| # - Create a file and truncate a second file. |
| # - Reflink the odd blocks of the first file into the second file. |
| # - CoW across the halfway mark, starting with the unwritten extent. |
| # - Check that the files are now different where we say they're different. |
| # |
| seq=`basename $0` |
| seqres=$RESULT_DIR/$seq |
| echo "QA output created by $seq" |
| |
| here=`pwd` |
| tmp=/tmp/$$ |
| status=1 # failure is the default! |
| trap "_cleanup; exit \$status" 0 1 2 3 15 |
| |
| _cleanup() |
| { |
| cd / |
| rm -rf $tmp.* |
| } |
| |
| # get standard environment, filters and checks |
| . ./common/rc |
| . ./common/filter |
| . ./common/reflink |
| |
| # real QA test starts here |
| _require_scratch_reflink |
| _require_xfs_io_command "falloc" |
| _require_xfs_io_command "cowextsize" |
| |
| rm -f $seqres.full |
| |
| 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)) |
| real_blksz=$(_get_block_size $testdir) |
| internal_blks=$((filesize / real_blksz)) |
| $XFS_IO_PROG -c "cowextsize $((blksz * 16))" $testdir >> $seqres.full |
| _weave_reflink_holes $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 $testdir/file3.chk | _filter_scratch |
| |
| echo "CoW across the transition" |
| cowoff=$((filesize / 4)) |
| cowsz=$((filesize / 2)) |
| $XFS_IO_PROG -f -c "pwrite -S 0x63 -b $cowsz $cowoff $cowsz" $testdir/file3 >> $seqres.full |
| _pwrite_byte 0x63 $cowoff $cowsz $testdir/file3.chk >> $seqres.full |
| _scratch_cycle_mount |
| |
| echo "Compare files" |
| md5sum $testdir/file1 | _filter_scratch |
| md5sum $testdir/file3 | _filter_scratch |
| md5sum $testdir/file3.chk | _filter_scratch |
| |
| echo "Check extent counts" |
| old_extents=$(_count_extents $testdir/file1) |
| new_extents=$(_count_extents $testdir/file3) |
| |
| echo "old extents: $old_extents" >> $seqres.full |
| echo "new extents: $new_extents" >> $seqres.full |
| echo "maximum extents: $internal_blks" >> $seqres.full |
| test $((new_extents - (nr / 4))) -lt $((internal_blks / 2)) || echo "file3 badly fragmented" |
| |
| # success, all done |
| status=0 |
| exit |