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30 lines
1.2 KiB
30 lines
1.2 KiB
6 years ago
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From: Pádraig Brady <pbrady@redhat.com>
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Avoid false failure due to speculative preallocation on XFS
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Avoid false failure due to delayed allocation on BTRFS
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diff -Naur coreutils-8.22.orig/tests/dd/sparse.sh coreutils-8.22/tests/dd/sparse.sh
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--- coreutils-8.22.orig/tests/dd/sparse.sh 2013-12-04 14:48:30.000000000 +0000
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+++ coreutils-8.22/tests/dd/sparse.sh 2015-05-19 21:24:55.139941789 +0000
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@@ -58,11 +58,18 @@
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# Ensure NUL blocks smaller than the block size are not made sparse.
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# Here, with a 2MiB block size, dd's conv=sparse must *not* introduce a hole.
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- dd if=file.in of=file.out bs=2M conv=sparse
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+ dd if=file.in of=file.out bs=2M conv=sparse,fsync
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test 2500 -lt $(kb_alloc file.out) || fail=1
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+ # Note we recreate a sparse file first to avoid
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+ # speculative preallocation seen in XFS, where a write() that
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+ # extends a file can preallocate some extra space that
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+ # a subsequent seek will not convert to a hole.
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+ rm -f file.out
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+ truncate --size=3M file.out
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+
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# Ensure that this 1MiB string of NULs *is* converted to a hole.
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- dd if=file.in of=file.out bs=1M conv=sparse
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+ dd if=file.in of=file.out bs=1M conv=sparse,notrunc,fsync
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test $(kb_alloc file.out) -lt 2500 || fail=1
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fi
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