Re: [PATCH] afs: Fix deadlock between writeback and truncate

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To: torvalds@xxxxxxxxxxxxxxxxxxxx
Subject: Re: [PATCH] afs: Fix deadlock between writeback and truncate
From: David Howells <dhowells@xxxxxxxxxx>
Date: Wed, 07 Oct 2020 15:59:35 +0100
Cc: dhowells@xxxxxxxxxx, linux-afs@xxxxxxxxxxxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
In-reply-to: <160207693283.3934207.6150787285715868358.stgit@warthog.procyon.org.uk>
Organization: Red Hat UK Ltd. Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SI4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 3798903

David Howells <dhowells@xxxxxxxxxx> wrote:

>  (1) Use the vnode validate_lock to mediate access between afs_setattr()
>      and afs_writepages():

Hmmm...  I wonder if the problem can occur between afs_setattr() and
afs_writepage() too.

David

References:
- [PATCH] afs: Fix deadlock between writeback and truncate
  - From: David Howells

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