2 # SPDX-License-Identifier: GPL-2.0
3 # Copyright (c) 2016, Oracle and/or its affiliates. All Rights Reserved.
7 # Test fragmentation after a lot of random CoW:
8 # - Create two reflinked files. Set extsz hint on second file.
9 # - Read the whole file into memory.
10 # - Buffered write to random offsets to scatter CoW reservations.
11 # - fadvise(dontneed) the whole file to evict the pages.
12 # - falloc the whole fle to see if the extsz hints still apply.
13 # - Check the number of extents.
16 _begin_fstest auto quick clone
18 # Import common functions.
22 # real QA test starts here
24 _require_scratch_reflink
26 _require_xfs_io_command "fiemap"
27 _require_xfs_io_command "cowextsize"
28 _require_xfs_io_command "funshare"
30 echo "Format and mount"
31 _scratch_mkfs > $seqres.full 2>&1
32 _scratch_mount >> $seqres.full 2>&1
34 testdir=$SCRATCH_MNT/test-$seq
39 filesize=$((blksz * nr))
41 bufsize=$((blksz * bufnr))
43 _require_fs_space $SCRATCH_MNT $((filesize / 1024 * 3 * 5 / 4))
44 real_blksz=$(_get_block_size $testdir)
45 internal_blks=$((filesize / real_blksz))
47 echo "Create the original files"
48 $XFS_IO_PROG -f -c "pwrite -S 0x61 -b $bufsize 0 $((filesize + 1))" $testdir/file1 >> $seqres.full
49 $XFS_IO_PROG -f -c "cowextsize $bufsize" $testdir/file2
50 _cp_reflink $testdir/file1 $testdir/file2 >> $seqres.full
54 md5sum $testdir/file1 | _filter_scratch
55 md5sum $testdir/file2 | _filter_scratch
57 echo "CoW and unmount"
58 $XFS_IO_PROG -f -c "cowextsize" $testdir/file2 >> $seqres.full
59 cat $testdir/file2 > /dev/null
60 $XFS_IO_PROG -f -c "pwrite -R -S 0x63 -b $real_blksz 0 $filesize" -c "fdatasync" $testdir/file2 >> $seqres.full
61 $XFS_IO_PROG -f -c "fadvise -d 0 $filesize" -c "fsync" $testdir/file2 >> $seqres.full
62 $XFS_IO_PROG -f -c "funshare 0 $filesize" $testdir/file2 >> $seqres.full
66 md5sum $testdir/file1 | _filter_scratch
68 echo "Check extent counts"
69 old_extents=$(_count_extents $testdir/file1)
70 new_extents=$(_count_extents $testdir/file2)
72 echo "old extents: $old_extents" >> $seqres.full
73 echo "new extents: $new_extents" >> $seqres.full
74 echo "maximum extents: $internal_blks" >> $seqres.full
75 test $new_extents -lt $((internal_blks / 20)) || test $new_extents -lt 15 \
76 || echo "file2 badly fragmented"