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

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Message-ID: <19352.1295591939@jrobl>
Date:	Fri, 21 Jan 2011 15:38:59 +0900
From:	"J. R. Okajima" <hooanon05@...oo.co.jp>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	npiggin@...il.com, npiggin@...nel.dk, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: vfs-scale, general questions


Miklos Szeredi:
> 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.

I see.
When chdir() completets before vfs_rename_dir(), the dir will not be
unhashed. It is OK.

Even if the dir is unhashed temporary before chdir(), then the lookup
fallback to ref-walk and i_mutex protects. It is OK too.

Thank you.
J. R. Okajima
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