From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx1.redhat.com ([209.132.183.28]:48396 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731029AbfDJLOB (ORCPT ); Wed, 10 Apr 2019 07:14:01 -0400 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 981777DCEB for ; Wed, 10 Apr 2019 11:14:00 +0000 (UTC) Received: from bfoster.bos.redhat.com (dhcp-41-2.bos.redhat.com [10.18.41.2]) by smtp.corp.redhat.com (Postfix) with ESMTP id 509441A7D2 for ; Wed, 10 Apr 2019 11:14:00 +0000 (UTC) From: Brian Foster Subject: [PATCH] fsx: test copy_file_range() using non-zero length copy Date: Wed, 10 Apr 2019 07:13:59 -0400 Message-Id: <20190410111359.5243-1-bfoster@redhat.com> Sender: fstests-owner@vger.kernel.org To: fstests@vger.kernel.org List-ID: The copy_file_range() test detection code performs a zero-length copy to determine whether to perform such calls during the test run. While this detects the common case of syscall availability, copy_file_range() has a somewhat variable implementation on the kernel side that can depend on certain per-filesystem features, etc. In some implementations, a zero length copy can shortcut and return success before ever invoking per-filesystem functionality and thus not thoroughly testing the copy mechanism on the current system. This can cause the test detection code to pass only to run into an immediate failure on the first copy_file_range() call during the test. Tweak test_copy_range() to perform a small single byte copy to avoid this problem. Also fix a typo bug in the errno check of the clone range detection logic. Signed-off-by: Brian Foster --- ltp/fsx.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/ltp/fsx.c b/ltp/fsx.c index 391824bf..06d08e4e 100644 --- a/ltp/fsx.c +++ b/ltp/fsx.c @@ -1364,7 +1364,7 @@ test_clone_range(void) }; if (ioctl(fd, FICLONERANGE, &fcr) && - (errno = EOPNOTSUPP || errno == ENOTTY)) { + (errno == EOPNOTSUPP || errno == ENOTTY)) { if (!quiet) fprintf(stderr, "main: filesystem does not support " @@ -1581,9 +1581,9 @@ do_dedupe_range(unsigned offset, unsigned length, unsigned dest) int test_copy_range(void) { - loff_t o1 = 0, o2 = 0; + loff_t o1 = 0, o2 = 1; - if (syscall(__NR_copy_file_range, fd, &o1, fd, &o2, 0, 0) == -1 && + if (syscall(__NR_copy_file_range, fd, &o1, fd, &o2, 1, 0) == -1 && (errno == ENOSYS || errno == EOPNOTSUPP || errno == ENOTTY)) { if (!quiet) fprintf(stderr, -- 2.17.2