From: Jeff Layton <jeff.layton@primarydata.com>
To: Christoph Hellwig <hch@infradead.org>
Cc: bfields@fieldses.org, linux-nfs@vger.kernel.org
Subject: Re: [PATCH 08/40] nfsd: Add locking to protect the state owner lists
Date: Tue, 29 Jul 2014 07:42:09 -0400 [thread overview]
Message-ID: <20140729074209.122238bd@f20.localdomain> (raw)
In-Reply-To: <20140727134218.GA26868@infradead.org>
On Sun, 27 Jul 2014 06:42:18 -0700
Christoph Hellwig <hch@infradead.org> wrote:
> On Mon, Jul 21, 2014 at 11:02:20AM -0400, Jeff Layton wrote:
> > Change to using the clp->cl_lock for this. For now, there's a lot of
> > cl_lock thrashing, but in later patches we'll eliminate that and close
> > the potential races that can occur when releasing the cl_lock while
> > walking the lists. For now, the client_mutex prevents those races.
>
> I'll have to look at those later patches, but in general I'd prefer
> not to have an intermediate stage like this. Maybe just merge
> the later cleanup in, maybe do some of the required cleanups before
> even adding the new locking.
>
Thanks for the comments so far! FWIW, this set of patches needed to be
respun anyway to deal with the nfs4_file hashing changes.
I've incorporated most of your comments into the respun set, and I'll
repost it once I get some confirmation from Bruce about the latest
set of delegation patches that precede it.
The one thing I didn't address is your comment above. Adding this
locking is hairy enough that I think it's warranted to do it with an
intermediate step like this.
--
Jeff Layton <jlayton@primarydata.com>
next prev parent reply other threads:[~2014-07-29 11:42 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-21 15:02 [PATCH 00/40] nfsd: stateid and stateowner refcounting overhaul Jeff Layton
2014-07-21 15:02 ` [PATCH 01/40] nfsd4: use cl_lock to synchronize all stateid idr calls Jeff Layton
2014-07-27 13:21 ` Christoph Hellwig
2014-07-21 15:02 ` [PATCH 02/40] nfsd: Add reference counting to the lock and open stateids Jeff Layton
2014-07-27 13:23 ` Christoph Hellwig
2014-07-21 15:02 ` [PATCH 03/40] nfsd: Add a struct nfs4_file field to struct nfs4_stid Jeff Layton
2014-07-27 13:24 ` Christoph Hellwig
2014-07-21 15:02 ` [PATCH 04/40] nfsd: Replace nfs4_ol_stateid->st_file with the st_stid.sc_file Jeff Layton
2014-07-27 13:25 ` Christoph Hellwig
2014-07-21 15:02 ` [PATCH 05/40] nfsd: Ensure atomicity of stateid destruction and idr tree removal Jeff Layton
2014-07-27 13:28 ` Christoph Hellwig
2014-07-21 15:02 ` [PATCH 06/40] nfsd: Cleanup the freeing of stateids Jeff Layton
2014-07-27 13:35 ` Christoph Hellwig
2014-07-21 15:02 ` [PATCH 07/40] nfsd: do filp_close in sc_free callback for lock stateids Jeff Layton
2014-07-27 13:37 ` Christoph Hellwig
2014-07-21 15:02 ` [PATCH 08/40] nfsd: Add locking to protect the state owner lists Jeff Layton
2014-07-27 13:42 ` Christoph Hellwig
2014-07-29 11:42 ` Jeff Layton [this message]
2014-07-21 15:02 ` [PATCH 09/40] nfsd: clean up races in lock stateid searching and creation Jeff Layton
2014-07-27 13:44 ` Christoph Hellwig
2014-07-21 15:02 ` [PATCH 10/40] nfsd: Slight cleanup of find_stateid() Jeff Layton
2014-07-27 13:38 ` Christoph Hellwig
2014-07-21 15:02 ` [PATCH 11/40] nfsd: ensure atomicity in nfsd4_free_stateid and nfsd4_validate_stateid Jeff Layton
2014-07-27 13:46 ` Christoph Hellwig
2014-07-21 15:02 ` [PATCH 12/40] nfsd: Add reference counting to lock stateids Jeff Layton
2014-07-21 15:02 ` [PATCH 13/40] nfsd: nfsd4_locku() must reference the lock stateid Jeff Layton
2014-07-21 15:02 ` [PATCH 14/40] nfsd: Ensure that nfs4_open_delegation() references the delegation stateid Jeff Layton
2014-07-21 15:02 ` [PATCH 15/40] nfsd: nfsd4_process_open2() must reference " Jeff Layton
2014-07-21 15:02 ` [PATCH 16/40] nfsd: nfsd4_process_open2() must reference the open stateid Jeff Layton
2014-07-21 15:02 ` [PATCH 17/40] nfsd: Prepare nfsd4_close() for open stateid referencing Jeff Layton
2014-07-21 15:02 ` [PATCH 18/40] nfsd: nfsd4_open_confirm() must reference the open stateid Jeff Layton
2014-07-21 15:02 ` [PATCH 19/40] nfsd: Add reference counting to nfs4_preprocess_confirmed_seqid_op Jeff Layton
2014-07-21 15:02 ` [PATCH 20/40] nfsd: Migrate the stateid reference into nfs4_preprocess_seqid_op Jeff Layton
2014-07-21 15:02 ` [PATCH 21/40] nfsd: Migrate the stateid reference into nfs4_lookup_stateid() Jeff Layton
2014-07-21 15:02 ` [PATCH 22/40] nfsd: Migrate the stateid reference into nfs4_find_stateid_by_type() Jeff Layton
2014-07-21 15:02 ` [PATCH 23/40] nfsd: Add reference counting to state owners Jeff Layton
2014-07-27 13:58 ` Christoph Hellwig
2014-07-21 15:02 ` [PATCH 24/40] nfsd: Add a mutex to protect the NFSv4.0 open owner replay cache Jeff Layton
2014-07-21 15:02 ` [PATCH 25/40] nfsd: Keep a reference to the open stateid for the NFSv4.0 " Jeff Layton
2014-07-27 13:59 ` Christoph Hellwig
2014-07-21 15:02 ` [PATCH 26/40] nfsd: clean up lockowner refcounting when finding them Jeff Layton
2014-07-21 15:02 ` [PATCH 27/40] nfsd: add an operation for unhashing a stateowner Jeff Layton
2014-07-21 15:02 ` [PATCH 28/40] nfsd: Make lock stateid take a reference to the lockowner Jeff Layton
2014-07-21 15:02 ` [PATCH 29/40] nfsd: clean up refcounting for lockowners Jeff Layton
2014-07-21 15:02 ` [PATCH 30/40] nfsd: make openstateids hold references to their openowners Jeff Layton
2014-07-21 15:02 ` [PATCH 31/40] nfsd: don't allow CLOSE to proceed until refcount on stateid drops Jeff Layton
2014-07-21 15:02 ` [PATCH 32/40] nfsd: Protect adding/removing open state owners using client_lock Jeff Layton
2014-07-21 15:02 ` [PATCH 33/40] nfsd: Protect adding/removing lock " Jeff Layton
2014-07-21 15:02 ` [PATCH 34/40] nfsd: Move the open owner hash table into struct nfs4_client Jeff Layton
2014-07-21 15:02 ` [PATCH 35/40] nfsd: clean up and reorganize release_lockowner Jeff Layton
2014-07-21 15:02 ` [PATCH 36/40] nfsd: add locking to stateowner release Jeff Layton
2014-07-21 15:02 ` [PATCH 37/40] nfsd: optimize destroy_lockowner cl_lock thrashing Jeff Layton
2014-07-21 15:02 ` [PATCH 38/40] nfsd: close potential race in nfsd4_free_stateid Jeff Layton
2014-07-21 15:02 ` [PATCH 39/40] nfsd: reduce cl_lock thrashing in release_openowner Jeff Layton
2014-07-21 15:02 ` [PATCH 40/40] nfsd: don't thrash the cl_lock while freeing an open stateid Jeff Layton
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