1 files changed, 49 insertions, 0 deletions
diff --git a/tests/cp/fiemap-perf.sh b/tests/cp/fiemap-perf.sh
new file mode 100755
index 0000000..4d85380
--- /dev/null
+++ b/tests/cp/fiemap-perf.sh
@@ -0,0 +1,49 @@
+#!/bin/sh
+# ensure that a sparse file is copied efficiently, by default
+
+# Copyright (C) 2011-2020 Free Software Foundation, Inc.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
+print_ver_ cp
+
+# Require a fiemap-enabled FS.
+touch fiemap_chk
+fiemap_capable_ fiemap_chk ||
+  skip_ "this file system lacks FIEMAP support"
+
+# Exclude ext[23] (or unknown fs types)
+# as the emulated extent scanning can be slow
+df -t ext2 -t ext3 . >/dev/null &&
+  skip_ "ext[23] can have slow FIEMAP scanning"
+
+# Create a large-but-sparse file.
+timeout 10 truncate -s1T f ||
+  skip_ "unable to create a 1 TiB sparse file"
+
+# Disable this test on old BTRFS (e.g. Fedora 14)
+# which reports (unwritten) extents for holes.
+filefrag f || skip_ "the 'filefrag' utility is missing"
+filefrag f | grep -F ': 0 extents found' > /dev/null ||
+  skip_ 'this file system reports extents for holes'
+
+# Nothing can read (much less write) that many bytes in so little time.
+timeout 10 cp f f2 || fail=1
+
+# Ensure that the sparse file copied through fiemap has the same size
+# in bytes as the original.
+test "$(stat --printf %s f)" = "$(stat --printf %s f2)" || fail=1
+
+Exit $fail