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selftests/mount_setattr: adapt detached mount propagation test

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Make sure that detached trees don't receive mount propagation.

Signed-off-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Christian Brauner
2025-06-07 00:41:29 -04:00
committed by Al Viro
parent 290da20e33
commit 7054674ee9
1 changed files with 1 additions and 16 deletions
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tools/testing/selftests/mount_setattr/mount_setattr_test.c
+1 -16
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@@ -2079,24 +2079,9 @@ TEST_F(mount_setattr, detached_tree_propagation)
* means that the device information will be different for any
* statx() that was taken from /mnt/A before the mount compared
* to one after the mount.
*
* Since we already now that the device information between the
* stx1 and stx2 samples are identical we also now that stx2 and
* stx3 device information will necessarily differ.
*/
ASSERT_NE(stx1.stx_dev_minor, stx3.stx_dev_minor);
/*
* If mount propagation worked correctly then the tmpfs mount
* that was created after the mount namespace was unshared will
* have propagated onto /mnt/A in the detached mount tree.
*
* Verify that the device information for stx3 and stx4 are
* identical. It is already established that stx3 is different
* from both stx1 and stx2 sampled before the tmpfs mount was
* done so if stx3 and stx4 are identical the proof is done.
*/
ASSERT_EQ(stx3.stx_dev_minor, stx4.stx_dev_minor);
ASSERT_EQ(stx1.stx_dev_minor, stx4.stx_dev_minor);
EXPECT_EQ(close(fd_tree), 0);
}