From: Brendan Jackman <jackmanb@google.com>
Date: Tue, 11 Mar 2025 13:18:19 +0000 (+0000)
Subject: selftests/mm: skip gup_longterm tests on weird filesystems
X-Git-Tag: v6.15-rc1~81^2~239
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=32b42970e8614c0b8652fcd441acec937bc2595e;p=thirdparty%2Fkernel%2Flinux.git

selftests/mm: skip gup_longterm tests on weird filesystems

Some filesystems don't support ftruncate()ing unlinked files.  They return
ENOENT.  In that case, skip the test.

Link: https://lkml.kernel.org/r/20250311-mm-selftests-v4-8-dec210a658f5@google.com
Signed-off-by: Brendan Jackman <jackmanb@google.com>
Cc: Dev Jain <dev.jain@arm.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Mateusz Guzik <mjguzik@gmail.com>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

diff --git a/tools/testing/selftests/mm/gup_longterm.c b/tools/testing/selftests/mm/gup_longterm.c
index 15335820656b1..03271442aae5a 100644
--- a/tools/testing/selftests/mm/gup_longterm.c
+++ b/tools/testing/selftests/mm/gup_longterm.c
@@ -96,7 +96,15 @@ static void do_test(int fd, size_t size, enum test_type type, bool shared)
 	int ret;
 
 	if (ftruncate(fd, size)) {
-		ksft_test_result_fail("ftruncate() failed (%s)\n", strerror(errno));
+		if (errno == ENOENT) {
+			/*
+			 * This can happen if the file has been unlinked and the
+			 * filesystem doesn't support truncating unlinked files.
+			 */
+			ksft_test_result_skip("ftruncate() failed with ENOENT\n");
+		} else {
+			ksft_test_result_fail("ftruncate() failed (%s)\n", strerror(errno));
+		}
 		return;
 	}