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dc05bc7ee2
* tests/cp/sparse-fiemap: Ensure that a file with many extents (more than fit in copy.c's internal buffer) is copied properly. Don't require root access if current partition is btrfs or xfs. Use init.sh, not test-lib.sh. * tests/filefrag-extent-compare: New file.
69 lines
2.0 KiB
Plaintext
69 lines
2.0 KiB
Plaintext
eval '(exit $?0)' && eval 'exec perl -wS "$0" ${1+"$@"}'
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& eval 'exec perl -wS "$0" $argv:q'
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if 0;
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# Determine whether two files have the same extents by comparing
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# the logical block numbers and lengths from filefrag -v for each.
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# Invoke like this:
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# This helper function, f, extracts logical block number and lengths.
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# f() { awk '/^ *[0-9]/ {printf "%d %d ",$2,NF<5?$NF:$5} END {print ""}'; }
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# { filefrag -v j1 | f; filefrag -v j2 | f; } | ./filefrag-extent-compare
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use warnings;
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use strict;
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(my $ME = $0) =~ s|.*/||;
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my @line = <>;
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my $n_lines = @line;
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$n_lines == 2
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or die "$ME: expected exactly two input lines; got $n_lines\n";
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my @A = split ' ', $line[0];
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my @B = split ' ', $line[1];
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@A % 2 || @B % 2
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and die "$ME: unexpected input: odd number of numbers; expected even\n";
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my @a;
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my @b;
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foreach my $i (0..@A/2-1) { $a[$i] = { L_BLK => $A[2*$i], LEN => $A[2*$i+1] } };
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foreach my $i (0..@B/2-1) { $b[$i] = { L_BLK => $B[2*$i], LEN => $B[2*$i+1] } };
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my $i = 0;
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my $j = 0;
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while (1)
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{
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!defined $a[$i] && !defined $b[$j]
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and exit 0;
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defined $a[$i] && defined $b[$j]
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or die "\@a and \@b have different lengths, even after adjustment\n";
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($a[$i]->{L_BLK} == $b[$j]->{L_BLK}
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&& $a[$i]->{LEN} == $b[$j]->{LEN})
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and next;
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($a[$i]->{LEN} < $b[$j]->{LEN}
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&& exists $a[$i+1] && $a[$i]->{LEN} + $a[$i+1]->{LEN} == $b[$j]->{LEN})
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and ++$i, next;
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exists $b[$j+1] && $a[$i]->{LEN} == $b[$i]->{LEN} + $b[$i+1]->{LEN}
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and ++$j, next;
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die "differing extent:\n"
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. " [$i]=$a[$i]->{L_BLK} $a[$i]->{LEN}\n"
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. " [$j]=$b[$j]->{L_BLK} $b[$j]->{LEN}\n"
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}
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continue
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{
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++$i;
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++$j;
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}
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### Setup "GNU" style for perl-mode and cperl-mode.
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## Local Variables:
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## mode: perl
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## perl-indent-level: 2
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## perl-continued-statement-offset: 2
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## perl-continued-brace-offset: 0
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## perl-brace-offset: 0
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## perl-brace-imaginary-offset: 0
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## perl-label-offset: -2
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## perl-extra-newline-before-brace: t
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## perl-merge-trailing-else: nil
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## End:
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