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Re: [PATCH 4/6] ubifs: Maintain a parent pointer

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On Sun, May 21, 2017 at 10:20:49PM +0200, Richard Weinberger wrote:
> The new feature UBIFS_FLG_PARENTPOINTER allows looking
> up the parent. Usually the Linux VFS walks down the filesystem
> and no parent pointers are needed. But when a filesystem
> is exportable via NFS such a lookup is needed.
> We can use a padding field in struct ubifs_ino_node to
> maintain a pointer to the parent inode.

Note that nfsd/exportfs will only do this for directories, and beacause
we hardlinks for other objects that is an important distinction.

I think the ubifs code should make sure to only maintain the parent
pointers for directories, otherwise confusion and abuses will happen.

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[PATCH 4/6] ubifs: Maintain a parent pointer Richard Weinberger <richard@nod.at> - 2017-05-21 22:30 +0200
  Re: [PATCH 4/6] ubifs: Maintain a parent pointer Hyunchul Lee <hyc.lee@gmail.com> - 2017-05-22 06:40 +0200
    Re: [PATCH 4/6] ubifs: Maintain a parent pointer Richard Weinberger <richard@nod.at> - 2017-05-22 10:50 +0200
      Re: [PATCH 4/6] ubifs: Maintain a parent pointer Hyunchul Lee <hyc.lee@gmail.com> - 2017-05-23 02:00 +0200
        Re: [PATCH 4/6] ubifs: Maintain a parent pointer Richard Weinberger <richard@nod.at> - 2017-05-23 09:20 +0200
  Re: [PATCH 4/6] ubifs: Maintain a parent pointer Christoph Hellwig <hch@infradead.org> - 2017-05-23 10:40 +0200
    Re: [PATCH 4/6] ubifs: Maintain a parent pointer Richard Weinberger <richard@nod.at> - 2017-05-23 10:50 +0200

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