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