[PATCH 6.18 299/309] selftests/mount_setattr: increase tmpfs size for idmapped mount tests

Greg Kroah-Hartman
2026-03-31T17:09:33Z

From: Christian Brauner <brauner@kernel.org>

[ Upstream commit c465f5591aa84a6f85d66d152e28b92844a45d4f ]

The mount_setattr_idmapped fixture mounts a 2 MB tmpfs at /mnt and then
creates a 2 GB sparse ext4 image at /mnt/C/ext4.img. While ftruncate()
succeeds (sparse file), mkfs.ext4 needs to write actual metadata blocks
(inode tables, journal, bitmaps) which easily exceeds the 2 MB tmpfs
limit, causing ENOSPC and failing the fixture setup for all
mount_setattr_idmapped tests.

This was introduced by commit d37d4720c3e7 ("selftests/mount_settattr:
ensure that ext4 filesystem can be created") which increased the image
size from 2 MB to 2 GB but didn't adjust the tmpfs size.

Bump the tmpfs size to 256 MB which is sufficient for the ext4 metadata.

Fixes: d37d4720c3e7 ("selftests/mount_settattr: ensure that ext4 filesystem can be created")
Signed-off-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
tools/testing/selftests/mount_setattr/mount_setattr_test.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/mount_setattr/mount_setattr_test.c b/tools/testing/selftests/mount_setattr/mount_setattr_test.c
index a688871a98eba..388bca88ec94f 100644
--- a/tools/testing/selftests/mount_setattr/mount_setattr_test.c
+++ b/tools/testing/selftests/mount_setattr/mount_setattr_test.c
@@ -1020,7 +1020,7 @@ FIXTURE_SETUP(mount_setattr_idmapped)
"size=100000,mode=700"), 0);

ASSERT_EQ(mount("testing", "/mnt", "tmpfs", MS_NOATIME | MS_NODEV,
- "size=2m,mode=700"), 0);
+ "size=256m,mode=700"), 0);

ASSERT_EQ(mkdir("/mnt/A", 0777), 0);

--
2.53.0