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shutdown: Lazy unmount /oldroot/{dev,proc,sys}

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These should not prevent us from cleaning up the remainders of /oldroot
if something in the kernel is blocking these from being unmounted.
This commit is contained in:
Jan Janssen 2022-05-18 08:12:31 +02:00
parent 20596876e3
commit df48b430a4
1 changed files with 11 additions and 0 deletions
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11
src/shutdown/umount.c
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@ -648,6 +648,17 @@ static int umount_with_timeout(MountPoint *m, bool last_try) {
if (r == -EBUSY && last_try)
log_umount_blockers(m->path);
/* If API filesystems under /oldroot cannot be unmounted we can still lazily unmount
* them to unblock /oldroot. They serve no function to us anymore and should be
* memory-only and hence safe to unmount like this. */
if (in_initrd() &&
PATH_STARTSWITH_SET(m->path, "/oldroot/dev", "/oldroot/proc", "/oldroot/sys")) {
log_info("Lazily unmounting '%s' instead.", m->path);
r = umount2(m->path, MNT_FORCE | MNT_DETACH);
if (r < 0)
log_error_errno(errno, "Failed to lazily unmount %s: %m", m->path);
}
}
_exit(r < 0 ? EXIT_FAILURE : EXIT_SUCCESS);