linux-kernel - Re: [PATCH 08/15] block, dax, pmem: reference counting infrastructure

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20150925113206.GA22272@infradead.org>
Date:	Fri, 25 Sep 2015 04:32:06 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	Dan Williams <dan.j.williams@...el.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jens Axboe <axboe@...nel.dk>,
	linux-nvdimm <linux-nvdimm@...1.01.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linux MM <linux-mm@...ck.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	Ross Zwisler <ross.zwisler@...ux.intel.com>
Subject: Re: [PATCH 08/15] block, dax, pmem: reference counting infrastructure

On Thu, Sep 24, 2015 at 05:03:18PM -0700, Dan Williams wrote:
> That makes sense to me, especially because drivers/nvdimm/blk.c is
> broken in the same way as drivers/nvdimm/pmem.c and it would be
> awkward to have it use blk_dax_get() / blk_dax_put().  The
> percpu_refcount should be valid for all queues and it will only ever
> be > 1 in the blk_mq and libnvdimm cases (for now).  Will fix.

Looking at this a bit more it might actually make sense to grab the
referene in common code before calling into ->make_request.

Jens, any opinion on that?
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/