Re: [PATCH] vfs: check dentry is still valid in get_link()

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Subject: Re: [PATCH] vfs: check dentry is still valid in get_link()
From: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Date: Tue, 18 Jan 2022 03:03:52 +0000
Cc: Brian Foster <bfoster@xxxxxxxxxx>, "Darrick J. Wong" <djwong@xxxxxxxxxx>, Christoph Hellwig <hch@xxxxxx>, Miklos Szeredi <miklos@xxxxxxxxxx>, David Howells <dhowells@xxxxxxxxxx>, Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, linux-fsdevel <linux-fsdevel@xxxxxxxxxxxxxxx>, xfs <linux-xfs@xxxxxxxxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
In-reply-to: <0f6c2348dae2c47ea46a986884a75fc7d44bb6fb.camel@themaw.net>
References: <164180589176.86426.501271559065590169.stgit@mickey.themaw.net> <YeJr7/E+9stwEb3t@zeniv-ca.linux.org.uk> <275358741c4ee64b5e4e008d514876ed4ec1071c.camel@themaw.net> <YeV+zseKGNqnSuKR@bfoster> <YeWZRL88KPtLWlkI@zeniv-ca.linux.org.uk> <YeWxHPDbdSfBDtyX@zeniv-ca.linux.org.uk> <YeXIIf6/jChv7JN6@zeniv-ca.linux.org.uk> <YeYYp89adipRN64k@zeniv-ca.linux.org.uk> <0f6c2348dae2c47ea46a986884a75fc7d44bb6fb.camel@themaw.net>

On Tue, Jan 18, 2022 at 10:31:53AM +0800, Ian Kent wrote:

> Wouldn't that case be caught by the unlazy call since ->get_link()
> needs to return -ECHILD for the rcu case now (in xfs anyway)?

*shrug*

that'd solve the problem, all right, but it's a serious overkill in
several respects.

References:
- [PATCH] vfs: check dentry is still valid in get_link()
  - From: Ian Kent
- Re: [PATCH] vfs: check dentry is still valid in get_link()
  - From: Al Viro
- Re: [PATCH] vfs: check dentry is still valid in get_link()
  - From: Ian Kent
- Re: [PATCH] vfs: check dentry is still valid in get_link()
  - From: Brian Foster
- Re: [PATCH] vfs: check dentry is still valid in get_link()
  - From: Al Viro
- Re: [PATCH] vfs: check dentry is still valid in get_link()
  - From: Al Viro
- Re: [PATCH] vfs: check dentry is still valid in get_link()
  - From: Al Viro
- Re: [PATCH] vfs: check dentry is still valid in get_link()
  - From: Al Viro
- Re: [PATCH] vfs: check dentry is still valid in get_link()
  - From: Ian Kent

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