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From: "J. R. Okajima" <hooanon05@yahoo.co.jp>
To: Robin Dong <hao.bigrat@gmail.com>
Cc: Miklos Szeredi <miklos@szeredi.hu>, linux-fsdevel@vger.kernel.org
Subject: Re: Question about overlayfs ovl_link
Date: Wed, 29 Feb 2012 14:09:27 +0900	[thread overview]
Message-ID: <25498.1330492167@jrobl> (raw)
In-Reply-To: <CAFZ0FUX0VFnKxYR0+tM4dM41u3fAZij0QRgqV=ms+9XO1JufRQ@mail.gmail.com>


Robin Dong:
> There are two ways to fix this problem.
> First, traverse all alias of inode to find a non-zero-d_count dentry,
> this may be inefficient
> Second, create a new overlayfs inode and a new overlayfs dentry in
> ovl_link, that will make the result of two actions
> ("create link" then "mount", or "mount" then "create link") consistent.

How about third one (as for the original "two inodes" problem)?
- create a table to convert the uppderdir (real) inode number into the
  overlayfs (virtual) inode number.
- using the table, you can get the virtual inum from the real inum.
- as long as you have a single real inum (for hardlinks), you will get a
  single virtual inum.


J. R. Okajima

  reply	other threads:[~2012-02-29  5:09 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-02-28  3:57 Question about overlayfs ovl_link Robin Dong
2012-02-28  8:41 ` Miklos Szeredi
2012-02-29  3:47   ` Robin Dong
2012-02-29  5:09     ` J. R. Okajima [this message]
2012-03-01 19:51     ` Miklos Szeredi

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