linux-kernel - Re: running out of tags in 9P (was Re: [git pull] vfs part 2)

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Message-ID: <20150702075007.GH17109@ZenIV.linux.org.uk>
Date:	Thu, 2 Jul 2015 08:50:08 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Andrey Ryabinin <a.ryabinin@...sung.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Eric Van Hensbergen <ericvh@...il.com>,
	linux-nfs@...r.kernel.org
Subject: Re: running out of tags in 9P (was Re: [git pull] vfs part 2)

On Thu, Jul 02, 2015 at 10:19:07AM +0300, Andrey Ryabinin wrote:
> On 07/02/2015 07:10 AM, Al Viro wrote:
> >>
> >> It should be easy to confirm - in p9_client_prepare_req() add
> >> 		if (WARN_ON_ONCE(tag != (u16)tag)) {
> >> 			p9_idpool_put(tag, c->tagpool);
> >> 			return ERR_PTR(-ENOMEM);
> >> 		}
> >> right after
> >>                 tag = p9_idpool_get(c->tagpool);
> >>                 if (tag < 0)
> >>                         return ERR_PTR(-ENOMEM);
> >>
> >> and see if it triggers.  I'm not sure if failing with ENOMEM is the
> >> right response (another variant is to sleep there until the pile
> >> gets cleaned or until we get killed), and WARN_ON_ONCE() is definitely
> >> not for the real work, but it will do for confirming that this is what
> >> we are hitting.
> > 
> 
> Apparently, I'm seeing something else. That WARN_ON_ONCE didn't trigger.

While the one in p9_client_write() (on rsize < count) did?
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