From 3e24bbc33fb993f16cc34f2d643920a4924b08f6 Mon Sep 17 00:00:00 2001 From: Brendan Jackman Date: Fri, 21 Feb 2025 18:25:47 +0000 Subject: [PATCH] selftests/mm: skip map_populate on weird filesystems It seems that 9pfs does not allow truncating unlinked files, Mark Brown has noted that NFS may also behave this way. It doesn't seem quite right to call this a "bug" but it's probably a special enough case that it makes sense for the test to just SKIP if it happens. Link: https://lkml.kernel.org/r/20250221-mm-selftests-v2-8-28c4d66383c5@google.com Signed-off-by: Brendan Jackman Cc: Dev Jain Cc: Lorenzo Stoakes Cc: Mateusz Guzik Cc: Shuah Khan (Samsung OSG) Signed-off-by: Andrew Morton --- tools/testing/selftests/mm/map_populate.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/tools/testing/selftests/mm/map_populate.c b/tools/testing/selftests/mm/map_populate.c index 5c8a53869b1b..cdd88531dd9f 100644 --- a/tools/testing/selftests/mm/map_populate.c +++ b/tools/testing/selftests/mm/map_populate.c @@ -87,6 +87,13 @@ int main(int argc, char **argv) BUG_ON(!ftmp, "tmpfile()"); ret = ftruncate(fileno(ftmp), MMAP_SZ); + if (ret < 0 && errno == ENOENT) { + /* + * This probably means tmpfile() made a file on a filesystem + * that doesn't handle temporary files the way we want. + */ + ksft_exit_skip("ftruncate(fileno(tmpfile())) gave ENOENT, weird filesystem?"); + } BUG_ON(ret, "ftruncate()"); smap = mmap(0, MMAP_SZ, PROT_READ | PROT_WRITE, -- 2.47.3