From: Mike Snitzer <snitzer@redhat.com>
To: Nikos Tsironis <ntsironis@arrikto.com>
Cc: ejt@redhat.com, dm-devel@redhat.com, agk@redhat.com
Subject: Re: [PATCH v2] dm thin: Fix bug wrt FUA request completion
Date: Fri, 15 Feb 2019 10:16:55 -0500 [thread overview]
Message-ID: <20190215151655.GB20900@redhat.com> (raw)
In-Reply-To: <ff84e335-6f48-c955-fab8-5b307959663a@arrikto.com>
On Fri, Feb 15 2019 at 9:33am -0500,
Nikos Tsironis <ntsironis@arrikto.com> wrote:
> On 2/15/19 3:54 PM, Joe Thornber wrote:
> > Ack.
> >
> > Thanks for this I was under the mistaken impression that FUA requests got split
> > by core dm into separate payload and PREFLUSH requests.
> >
> > I've audited dm-cache and that looks ok.
> >
> > How did you test this patch? That missing bio_list_init() in V1 must
> > have caused memory corruption?
> >
> > - Joe
>
> Hi Joe,
>
> bio_list_init() initializes the bio list's head and tail pointers to
> NULL and pool_create() allocates the struct pool structure using
> kzalloc() so the bio list was implicitly correctly initialized and no
> memory corruption occurred.
Yes, exactly right. v1 tested fine for me, so when I saw v2 I reasoned
through why the bio_list_init() wasn't an issue and it is like you've
said (kzalloc() saved us).
Can you help us understand how you identified this issue? Did you have
corruption after crash/powerfail and got to looking closer?
Thanks,
Mike
next prev parent reply other threads:[~2019-02-15 15:16 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-14 23:21 [PATCH v2] dm thin: Fix bug wrt FUA request completion Nikos Tsironis
2019-02-15 0:10 ` Mike Snitzer
2019-02-15 13:54 ` Joe Thornber
2019-02-15 14:33 ` Nikos Tsironis
2019-02-15 15:16 ` Mike Snitzer [this message]
2019-02-15 17:21 ` Nikos Tsironis
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