selftests/mm: skip hard dirty page-cache test on NFS

The hard dirty_pagecache variant uses MADV_HWPOISON to exercise recovery
of a dirty file-backed page.  The recovery path records -EIO in the
address_space mapping, which NFS later reports when the test closes the
file.  This makes the test fail after the hwpoison checks have completed.

Skip this variant when the test file is on NFS.  Keep the hard clean-page
and both soft-offline variants enabled because they use folio removal,
invalidation, or migration rather than recording a delayed writeback
error.

The unsupported-filesystem path in clean_pagecache() also returns without
closing the opened test file.  Close the descriptor before skipping there
and in dirty_pagecache().

Link: https://lore.kernel.org/20260727095225.372655-5-usama.anjum@arm.com
Signed-off-by: Muhammad Usama Anjum <usama.anjum@arm.com>
Reviewed-by: Miaohe Lin <linmiaohe@huawei.com>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Barry Song <baohua@kernel.org>
Cc: David Hildenbrand <david@kernel.org>
Cc: Dev Jain <dev.jain@arm.com>
Cc: Lance Yang <lance.yang@linux.dev>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Naoya Horiguchi <nao.horiguchi@gmail.com>
Cc: Nico Pache <npache@redhat.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Sarthak Sharma <sarthak.sharma@arm.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Usama Arif <usama.arif@linux.dev>
Cc: Vlastimil Babka <vbabka@kernel.org>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

1 files changed, 12 insertions, 2 deletions

diff --git a/tools/testing/selftests/mm/memory-failure.c b/tools/testing/selftests/mm/memory-failure.c
index 1a5a32e22cce..f3cb578b1609 100644
--- a/tools/testing/selftests/mm/memory-failure.c
+++ b/tools/testing/selftests/mm/memory-failure.c
@@ -287,8 +287,10 @@ TEST_F(memory_failure, clean_pagecache)
 	if (fd < 0)
 		SKIP(return, "failed to open test file.\n");
 	fs_type = get_fs_type(fd);
-	if (!fs_type || fs_type == TMPFS_MAGIC)
+	if (!fs_type || fs_type == TMPFS_MAGIC) {
+		close(fd);
 		SKIP(return, "unsupported filesystem :%x\n", fs_type);
+	}
 
 	addr = mmap(0, self->page_size, PROT_READ | PROT_WRITE,
 		    MAP_SHARED, fd, 0);
@@ -327,8 +329,16 @@ TEST_F(memory_failure, dirty_pagecache)
 	if (fd < 0)
 		SKIP(return, "failed to open test file.\n");
 	fs_type = get_fs_type(fd);
-	if (!fs_type || fs_type == TMPFS_MAGIC)
+	/*
+	 * MADV_HARD poisoning of dirty page-cache data records an expected
+	 * -EIO in the file mapping. NFS reports this error on close(), so
+	 * skip this variant.
+	 */
+	if (!fs_type || fs_type == TMPFS_MAGIC ||
+	    (fs_type == NFS_SUPER_MAGIC && variant->type == MADV_HARD)) {
+		close(fd);
 		SKIP(return, "unsupported filesystem :%x\n", fs_type);
+	}
 
 	addr = mmap(0, self->page_size, PROT_READ | PROT_WRITE,
 		    MAP_SHARED, fd, 0);