selftests/filesystems: check that a mount namespace file on top doesn't bury a mount

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Add a test for moving a mount with a mount namespace file on top of it:

- S, a bind mount of a file, with a newer mount namespace's file on top
- A shared with a slave B that has Q on B/file
- S moved onto A/file, its copy lands on B/file below Q

B/file keeps reading Q and once Q is unmounted it reads the copy.

Link: https://patch.msgid.link/20260930-work-mount-fixes-3-v1-9-be34c83956ae@kernel.org
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>

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Christian Brauner 2026-09-30 15:32:01 +02:00

parent 8714b44ada

commit c518a195f6

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3 changed files with 192 additions and 1 deletions

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1

tools/testing/selftests/filesystems/mount_cycle/.gitignore vendored

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2

tools/testing/selftests/filesystems/mount_cycle/Makefile

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190

tools/testing/selftests/filesystems/mount_cycle/overmount_ns_file_test.c

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