linux-toradex.git/tools/testing/selftests/filesystems/freeze, branch master Linux kernel for Apalis and Colibri modules selftests/filesystems: add a test for freezing a shared block device 2026-10-22T16:50:16+00:00 Christian Brauner brauner@kernel.org 2026-10-12T12:31:18+00:00 073d71c5118f40449d9c7df828677aaa437372e1 erofs claims its blob devices with the filesystem type as the holder so several erofs superblocks can share one. Merge two images from a common layer and a layer of their own, put the common layer on device-mapper, mount both and check that: - a suspend freezes each of them exactly once - the resume thaws both - once one of them is unmounted only the other one is frozen - BLKFLSBUF and ustat() on the shared device work - mounts that come and go while the device is suspended and resumed leave nothing frozen behind mkfs.erofs builds the images, the test is skipped without it. Link: https://patch.msgid.link/20261012-work-super-dev_hash-v1-1-305cf71cd334@kernel.org Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org> 
erofs claims its blob devices with the filesystem type as the holder so
several erofs superblocks can share one. Merge two images from a common
layer and a layer of their own, put the common layer on device-mapper,
mount both and check that:

- a suspend freezes each of them exactly once

- the resume thaws both

- once one of them is unmounted only the other one is frozen

- BLKFLSBUF and ustat() on the shared device work

- mounts that come and go while the device is suspended and resumed
  leave nothing frozen behind

mkfs.erofs builds the images, the test is skipped without it.

Link: https://patch.msgid.link/20261012-work-super-dev_hash-v1-1-305cf71cd334@kernel.org
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>