2 # SPDX-License-Identifier: GPL-2.0
3 # Copyright (c) 2015, Oracle and/or its affiliates. All Rights Reserved.
7 # Ensure that CoW on all copies of a file reflinked N times increases block count
8 # - Record fs block usage (0)
9 # - Create a file and some reflink copies
10 # - Record fs block usage (1)
11 # - CoW some blocks of the copies
12 # - Record fs block usage (2)
13 # - CoW all the rest of the blocks of the copies
14 # - Compare fs block usage to (2), (1), and (0)
17 _begin_fstest auto quick clone
19 # Override the default cleanup function.
23 rm -rf $tmp.* $testdir
26 # Import common functions.
30 # real QA test starts here
34 testdir=$TEST_DIR/test-$seq
38 echo "Create the original file blocks"
39 blksz="$(_get_block_size $testdir)"
42 free_blocks0=$(stat -f $testdir -c '%f')
44 filesize=$((blksz * nr))
46 _pwrite_byte 0x61 0 $sz $testdir/file1 >> $seqres.full
49 echo "Create the reflink copies"
50 for i in `seq 2 $nr`; do
51 _cp_reflink $testdir/file1 $testdir/file$i
54 free_blocks1=$(stat -f $testdir -c '%f')
56 echo "Rewrite some of the blocks"
57 _pwrite_byte 0x62 0 $sz $testdir/file2 >> $seqres.full
58 _pwrite_byte 0x63 0 $((sz / 2)) $testdir/file3 >> $seqres.full
59 _pwrite_byte 0x64 $((sz / 2)) $((sz / 2)) $testdir/file4 >> $seqres.full
61 free_blocks2=$(stat -f $testdir -c '%f')
63 echo "Rewrite all the files"
64 _pwrite_byte 0x62 0 $sz $testdir/file2 >> $seqres.full
65 _pwrite_byte 0x63 0 $sz $testdir/file3 >> $seqres.full
66 _pwrite_byte 0x64 0 $sz $testdir/file4 >> $seqres.full
68 free_blocks3=$(stat -f $testdir -c '%f')
70 echo "Rewrite the original file"
71 _pwrite_byte 0x65 0 $sz $testdir/file1 >> $seqres.full
73 free_blocks4=$(stat -f $testdir -c '%f')
74 #echo $free_blocks0 $free_blocks1 $free_blocks2 $free_blocks3 $free_blocks4
76 _within_tolerance "free blocks after reflinking" $free_blocks1 $((free_blocks0 - blks)) $margin -v
78 _within_tolerance "free blocks after partially CoWing some copies" $free_blocks2 $((free_blocks1 - (2 * blks))) $margin -v
80 _within_tolerance "free blocks after CoWing all copies" $free_blocks3 $((free_blocks2 - blks)) $margin -v
82 _within_tolerance "free blocks after overwriting original" $free_blocks4 $free_blocks3 $margin -v
84 _within_tolerance "free blocks after all tests" $free_blocks4 $((free_blocks0 - (4 * blks))) $margin -v