kernel/linux.git/tools/testing/selftests/mount_setattr, branch v6.18.21

selftests/mount_setattr: increase tmpfs size for idmapped mount tests

2026-04-02T11:23:32+00:00

[ 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 Signed-off-by: Sasha Levin

selftests/mount_setattr: add smoke tests for open_tree_attr(2) bug

2025-08-11T12:51:49+00:00

There appear to be no other open_tree_attr(2) tests at the moment, but as a minimal solution just add some additional checks in the existing MOUNT_ATTR_IDMAP tests to make sure that open_tree_attr(2) cannot be used to bypass the tested restrictions that apply to mount_setattr(2). Signed-off-by: Aleksa Sarai Link: https://lore.kernel.org/20250808-open_tree_attr-bugfix-idmap-v1-2-0ec7bc05646c@cyphar.com Signed-off-by: Christian Brauner

selftests/mount_setattr: adapt detached mount propagation test

2025-06-07T04:41:29+00:00

Make sure that detached trees don't receive mount propagation. Signed-off-by: Christian Brauner Signed-off-by: Al Viro

selftests/mount_settattr: remove duplicate syscall definitions

2025-05-12T09:40:12+00:00

Which are already defined in wrappers.h. For now, the syscall defintions of mount_settattr() itself remain in the test, which is the only test to use them. Signed-off-by: Amir Goldstein Link: https://lore.kernel.org/20250509133240.529330-5-amir73il@gmail.com Reviewed-by: Christian Brauner Signed-off-by: Christian Brauner

selftests/filesystems: move wrapper.h out of overlayfs subdir

2025-05-12T09:40:12+00:00

This is not an overlayfs specific header. Reviewed-by: John Hubbard Signed-off-by: Amir Goldstein Link: https://lore.kernel.org/20250509133240.529330-2-amir73il@gmail.com Reviewed-by: Christian Brauner Signed-off-by: Christian Brauner

selftests/mount_settattr: ensure that ext4 filesystem can be created

2025-05-12T09:40:08+00:00

Filesystem too small for a journal mount: /mnt/D/: mount failed: Operation not permitted. mount_setattr_test.c:1076:idmap_mount_tree_invalid:Expected system("mount -o loop -t ext4 /mnt/C/ext4.img /mnt/D/") (256) == 0 (0) Signed-off-by: Christian Brauner

selftests/mount_settattr: don't define sys_open_tree() twice

2025-05-12T09:40:08+00:00

CC mount_setattr_test mount_setattr_test.c:176:19: error: redefinition of ‘sys_open_tree’ 176 | static inline int sys_open_tree(int dfd, const char *filename, unsigned int flags) | ^~~~~~~~~~~~~ In file included from mount_setattr_test.c:23: ../filesystems/overlayfs/wrappers.h:59:19: note: previous definition of ‘sys_open_tree’ with type ‘int(int, const char *, unsigned int)’ 59 | static inline int sys_open_tree(int dfd, const char *filename, unsigned int flags) Signed-off-by: Christian Brauner

selftests: test subdirectory mounting

2025-03-04T08:29:55+00:00

This tests mounting a subdirectory without ever having to expose the filesystem to a non-anonymous mount namespace. Link: https://lore.kernel.org/r/20250225-work-mount-propagation-v1-3-e6e3724500eb@kernel.org Signed-off-by: Christian Brauner

selftests: add test for detached mount tree propagation

2025-03-04T08:29:55+00:00

Test that detached mount trees receive propagation events. Link: https://lore.kernel.org/r/20250225-work-mount-propagation-v1-2-e6e3724500eb@kernel.org Signed-off-by: Christian Brauner

selftests: seventh test for mounting detached mounts onto detached mounts

2025-03-04T08:29:54+00:00

Add a test to verify that detached mounts behave correctly. Link: https://lore.kernel.org/r/20250221-brauner-open_tree-v1-16-dbcfcb98c676@kernel.org Signed-off-by: Christian Brauner