linux-kernel - Re: vfs-scale, general questions

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Message-Id: <E1PfsUI-0007gV-Gw@pomaz-ex.szeredi.hu>
Date:	Thu, 20 Jan 2011 12:15:34 +0100
From:	Miklos Szeredi <miklos@...redi.hu>
To:	"J. R. Okajima" <hooanon05@...oo.co.jp>
CC:	npiggin@...il.com, npiggin@...nel.dk, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: vfs-scale, general questions

On Thu, 20 Jan 2011, J. R. Okajima wrote:
> You might think about the race around d_move, but what I meant is the
> race between d_unlinked and unhash/rehash.
> 
> - getcwd return -ENOENT when pwd is unhashed.
> - vfs_rename_dir()
>   + makes the existing target unhashed.

No it doesn't.  dentry_unhash() doesn't drop the dentry from the hash
unless it has no other references, cwd being one such ref.

Thanks,
Miklos
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