[PATCH v2 9/9] selftests/mm: Skip gup_longerm tests on weird filesystems

[Brendan Jackman <jackmanb@google.com>]

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

Signed-off-by: Brendan Jackman <jackmanb@google.com>
---
 tools/testing/selftests/mm/gup_longterm.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/mm/gup_longterm.c b/tools/testing/selftests/mm/gup_longterm.c
index 879e9e4e8cce8127656fabe098abf7db5f6c5e23..d2c33dd9da9cd43cc6666e5d9ffd3ff9e62dbb27 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");
+		} else {
+			ksft_test_result_fail("ftruncate() failed (%s)\n", strerror(errno));
+		}
 		return;
 	}
 

-- 
2.48.1.601.g30ceb7b040-goog