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403e8e3b89
* tests/filefrag-extent-compare: Don't check the length of the last extent, as this was seen to vary on XFS, where it leaves trailing blocks allocated for performance reasons. * tests/cp/fiemap-empty: Though not seen as an issue in practise, try to avoid possible issues with the allocator in file systems, by requesting to allocate a power of 2.
86 lines
2.4 KiB
Plaintext
86 lines
2.4 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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# Merge adjacent extents in array E.
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sub merge_extents($)
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{
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my ($e) = @_;
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my $i = 0;
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while (1)
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{
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!defined $e->[$i+1]
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and last;
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$e->[$i]->{L_BLK} + $e->[$i]->{LEN} != $e->[$i+1]->{L_BLK}
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and ++$i, next;
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$e->[$i]->{LEN} += $e->[$i+1]->{LEN};
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# Remove $e->[$i+1]
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splice @$e, $i+1, 1;
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}
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}
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merge_extents \@a;
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merge_extents \@b;
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@a == @b
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or die "$ME: extent counts differ, even after adjustment\n";
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my $i = 0;
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while (defined $a[$i])
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{
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my $start_match = $a[$i]->{L_BLK} == $b[$i]->{L_BLK};
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my $len_match = $a[$i]->{LEN} == $b[$i]->{LEN};
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if ( ! ($start_match && ($len_match || $i == (@a - 1))))
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{
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# On XFS on Linux kernel 2.6.38, it was seen that the size of the
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# last extent can vary, and can extend beyond the length of the file.
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# So we ignore the length of the last extent, because if the
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# file is the wrong length we'll get failures elsewhere.
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die "$ME: differing extent:\n"
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. " [$i]=$a[$i]->{L_BLK} $a[$i]->{LEN}\n"
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. " [$i]=$b[$i]->{L_BLK} $b[$i]->{LEN}\n";
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}
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$i++;
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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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