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SubjectRe: [PATCH] vfs: introduce UMOUNT_WAIT which waits for umount completion
On Fri, Sep 15, 2017 at 11:44:33AM -0700, Jaegeuk Kim wrote:
>
> So, I digged it in more detail, and found, in drivers/android/binder.c [1],
> - binder_ioctl()
> - create a kernel thread
> - zombie_cleanup_check()
> - binder_defer_work()
> - queue_work(..., &binder_deferred_work);
>
> - binder_deferred_func()
> - binder_clear_zombies()
> - binder_proc_clear_zombies()
> - put_files_struct()
> - close_files()
> - filp_close()
> - fput()
>
> It seems binder holds some proc files.

If binder was holding some files open, then umount should have failed
with EBUSY, no?

Does Android use mount namespaces at all?

- Ted

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