Re: Does /var/shm still need to be mounted?

From: H. Peter Anvin (
Date: Fri Jun 02 2000 - 15:22:17 EST

Followup to: <Pine.LNX.4.21.0006021321300.2581-100000@saturn.homenet>
By author: Tigran Aivazian <>
In newsgroup:
> did you look at kern_mount/umount interface that went into the kernel
> recently? Things like shm and pipefs should (and already are) mounted
> under artificially constructed root mountpoints like "pipe:" which are not
> visible for namelookups coming from userspace. Ok, it is not the case for
> shm currently (it is mounted on /) but perhaps it should be (i.e. the way
> root dentry should be allocated as for pipefs using d_alloc() directly
> instead of using generic d_alloc_root())?
> I cc'd Al Viro as I suspect he knows the answer to the above question.

No, shmfs actually needs a real path. Not for SysV IPC, but for POSIX


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