Commit 571a4b62 authored by Brendan Jackman's avatar Brendan Jackman Committed by Andrew Morton
Browse files

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/20250311-mm-selftests-v4-7-dec210a658f5@google.com


Signed-off-by: default avatarBrendan 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: default avatarAndrew Morton <akpm@linux-foundation.org>
parent bf6d575e

tools/testing/selftests/mm/map_populate.c

+7 −0
Original line number Diff line number Diff line
@@ -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?\n");

	}

	BUG_ON(ret, "ftruncate()");



	smap = mmap(0, MMAP_SZ, PROT_READ | PROT_WRITE,