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authorPádraig Brady <P@draigBrady.com>2014-04-11 23:44:13 +0100
committerPádraig Brady <P@draigBrady.com>2014-04-11 23:52:08 +0100
commit7c03fe2c9f498bad7e40d29f2eb4573d23e102d0 (patch)
treedfee25f3115d501d25fc233bb76b7194244dc379 /tests/dd
parente9cb3eb6cee714865eff7a29e6c2101e545617c2 (diff)
downloadcoreutils-7c03fe2c9f498bad7e40d29f2eb4573d23e102d0.tar.xz
tests: fix false dd conv=sparse failure on newer XFS
* tests/dd/sparse.sh: When testing that a hole is created, use an existing sparse destination file, so that we're not write extending the file size, and thus avoiding speculative preallocation which can result in smaller holes than requested. Workaround suggested by Brian Foster
Diffstat (limited to 'tests/dd')
-rwxr-xr-xtests/dd/sparse.sh9
1 files changed, 8 insertions, 1 deletions
diff --git a/tests/dd/sparse.sh b/tests/dd/sparse.sh
index 06efc7017..a7e90d2be 100755
--- a/tests/dd/sparse.sh
+++ b/tests/dd/sparse.sh
@@ -61,8 +61,15 @@ if test $(kb_alloc file.in) -gt 3000; then
dd if=file.in of=file.out bs=2M conv=sparse
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
test $(kb_alloc file.out) -lt 2500 || fail=1
fi