linux-kernel - Re: FS-Cache: Duplicate cookie detected

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Message-ID: <22096.1551878195@warthog.procyon.org.uk>
Date:   Wed, 06 Mar 2019 13:16:35 +0000
From:   David Howells <dhowells@...hat.com>
To:     Christian Kujau <lists@...dbynature.de>
Cc:     dhowells@...hat.com, linux-kernel@...r.kernel.org,
        Anna Schumaker <anna.schumaker@...app.com>,
        Steve Dickson <steved@...hat.com>
Subject: Re: FS-Cache: Duplicate cookie detected

Christian Kujau <lists@...dbynature.de> wrote:

>  FS-Cache: Duplicate cookie detected
>  FS-Cache: O-cookie c=000000009da9dbf0 [p=000000001593f904 fl=222 nc=0 na=1]
>  FS-Cache: O-cookie d=00000000287febd9 n=00000000980c9e8a
>  FS-Cache: O-key=[8] '020001bdc0a80064'
>  FS-Cache: N-cookie c=00000000bfe3f869 [p=000000001593f904 fl=2 nc=0 na=1]
>  FS-Cache: N-cookie d=00000000287febd9 n=00000000e153f178
>  FS-Cache: N-key=[8] '020001bdc0a80064'

I've just spotted something that all these things have in common.  The old
cookie has FSCACHE_COOKIE_RELINQUISHING set in the flags (fl=222).  I don't
have a wait for this situation in fscache - which I should.

Interestingly, '020001bdc0a80064' looks like is could be the key from the
server level, assuming this is from NFS:

	0200 01bdc0a8 0064

could be:

	AF_INET (LE), 1.189.192.168, 100 (BE)

David