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From: Shyam Prasad N <>
To: Paulo Alcantara <>
Cc: "Steve French" <>,
	"Aurélien Aptel" <>,
	CIFS <>,, "rohiths msft" <>
Subject: Re: Multichannel patches
Date: Sat, 5 Jun 2021 19:38:12 +0530	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

The buildbot testing once hit a deadlock when running with the above patches.
I found one possibility during cifs_reconnect, where a deadlock can occur.

I've fixed that and some warnings that kernel bots have identified in
the below two patches:


On Fri, Jun 4, 2021 at 8:55 PM Paulo Alcantara <> wrote:
> Shyam Prasad N <> writes:
> > @Paulo Alcantara That would be great if you can help testing my
> > changes. Please test with these new changes.
> OK.
> >> The super is only used for providing cifs_sb_info::origin_fullpath as key to find the corresponding failover targets in referral cache.
> > I'm wondering what would happen if there are multiple tcons to the
> > same origin_fullpath (possibly in different sessions)?
> That is certainly a problem, indeed.  I'm waiting for the DFS tests to
> finish and then send a series that contains a potential fix for that --
> e.g. not sharing TCP servers when mounting DFS shares.  We used to not
> share tcons with DFS mounts because they might contain different prefix
> paths but connected to same share, however that wasn't enough because
> multiple DFS mounts may connect to same target servers, although they
> might failover to completely different servers.
> > Also, doesn't failover targets apply to each channel under a session?
> > Shouldn't we switch targets on reconnect of secondary channels too?
> That's a interesting question.  I recall discussing this with Aurelien
> some time ago while running a few DFS + multichannel tests.
> So yes, I agree with you that when we successfully reconnect to failover
> target (primary channel), then we should also update all secondary
> channels with the new server's ip address and reconnect them.


  reply	other threads:[~2021-06-05 14:09 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-02 12:43 Multichannel patches Shyam Prasad N
2021-06-02 15:57 ` Aurélien Aptel
2021-06-02 18:55   ` Steve French
2021-06-02 16:45 ` Paulo Alcantara
2021-06-04  9:13   ` Shyam Prasad N
2021-06-04 15:10     ` Steve French
2021-06-04 15:25     ` Paulo Alcantara
2021-06-05 14:08       ` Shyam Prasad N [this message]
2021-06-05 17:43         ` Steve French
2021-06-05 17:57           ` Steve French
2021-06-08  9:54             ` Shyam Prasad N

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